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>
85 typedef struct symbol *symbolp;
88 /* When == 1, print basic high level tracing messages.
89 When > 1, be more verbose.
90 This is in contrast to the low level DIE reading of dwarf_die_debug. */
91 static unsigned int dwarf_read_debug = 0;
93 /* When non-zero, dump DIEs after they are read in. */
94 static unsigned int dwarf_die_debug = 0;
96 /* When non-zero, dump line number entries as they are read in. */
97 static unsigned int dwarf_line_debug = 0;
99 /* When non-zero, cross-check physname against demangler. */
100 static int check_physname = 0;
102 /* When non-zero, do not reject deprecated .gdb_index sections. */
103 static int use_deprecated_index_sections = 0;
105 static const struct objfile_data *dwarf2_objfile_data_key;
107 /* The "aclass" indices for various kinds of computed DWARF symbols. */
109 static int dwarf2_locexpr_index;
110 static int dwarf2_loclist_index;
111 static int dwarf2_locexpr_block_index;
112 static int dwarf2_loclist_block_index;
114 /* A descriptor for dwarf sections.
116 S.ASECTION, SIZE are typically initialized when the objfile is first
117 scanned. BUFFER, READIN are filled in later when the section is read.
118 If the section contained compressed data then SIZE is updated to record
119 the uncompressed size of the section.
121 DWP file format V2 introduces a wrinkle that is easiest to handle by
122 creating the concept of virtual sections contained within a real section.
123 In DWP V2 the sections of the input DWO files are concatenated together
124 into one section, but section offsets are kept relative to the original
126 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
127 the real section this "virtual" section is contained in, and BUFFER,SIZE
128 describe the virtual section. */
130 struct dwarf2_section_info
134 /* If this is a real section, the bfd section. */
136 /* If this is a virtual section, pointer to the containing ("real")
138 struct dwarf2_section_info *containing_section;
140 /* Pointer to section data, only valid if readin. */
141 const gdb_byte *buffer;
142 /* The size of the section, real or virtual. */
144 /* If this is a virtual section, the offset in the real section.
145 Only valid if is_virtual. */
146 bfd_size_type virtual_offset;
147 /* True if we have tried to read this section. */
149 /* True if this is a virtual section, False otherwise.
150 This specifies which of s.section and s.containing_section to use. */
154 typedef struct dwarf2_section_info dwarf2_section_info_def;
155 DEF_VEC_O (dwarf2_section_info_def);
157 /* All offsets in the index are of this type. It must be
158 architecture-independent. */
159 typedef uint32_t offset_type;
161 DEF_VEC_I (offset_type);
163 /* Ensure only legit values are used. */
164 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
166 gdb_assert ((unsigned int) (value) <= 1); \
167 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
170 /* Ensure only legit values are used. */
171 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
173 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
174 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
175 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
178 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
179 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
181 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
182 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
185 /* A description of the mapped index. The file format is described in
186 a comment by the code that writes the index. */
189 /* Index data format version. */
192 /* The total length of the buffer. */
195 /* A pointer to the address table data. */
196 const gdb_byte *address_table;
198 /* Size of the address table data in bytes. */
199 offset_type address_table_size;
201 /* The symbol table, implemented as a hash table. */
202 const offset_type *symbol_table;
204 /* Size in slots, each slot is 2 offset_types. */
205 offset_type symbol_table_slots;
207 /* A pointer to the constant pool. */
208 const char *constant_pool;
211 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
212 DEF_VEC_P (dwarf2_per_cu_ptr);
216 int nr_uniq_abbrev_tables;
218 int nr_symtab_sharers;
219 int nr_stmt_less_type_units;
220 int nr_all_type_units_reallocs;
223 /* Collection of data recorded per objfile.
224 This hangs off of dwarf2_objfile_data_key. */
226 struct dwarf2_per_objfile
228 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
229 dwarf2 section names, or is NULL if the standard ELF names are
231 dwarf2_per_objfile (struct objfile *objfile,
232 const dwarf2_debug_sections *names);
234 ~dwarf2_per_objfile ();
236 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
238 /* Free all cached compilation units. */
239 void free_cached_comp_units ();
241 /* This function is mapped across the sections and remembers the
242 offset and size of each of the debugging sections we are
244 void locate_sections (bfd *abfd, asection *sectp,
245 const dwarf2_debug_sections &names);
248 dwarf2_section_info info {};
249 dwarf2_section_info abbrev {};
250 dwarf2_section_info line {};
251 dwarf2_section_info loc {};
252 dwarf2_section_info loclists {};
253 dwarf2_section_info macinfo {};
254 dwarf2_section_info macro {};
255 dwarf2_section_info str {};
256 dwarf2_section_info line_str {};
257 dwarf2_section_info ranges {};
258 dwarf2_section_info rnglists {};
259 dwarf2_section_info addr {};
260 dwarf2_section_info frame {};
261 dwarf2_section_info eh_frame {};
262 dwarf2_section_info gdb_index {};
264 VEC (dwarf2_section_info_def) *types = NULL;
267 struct objfile *objfile = NULL;
269 /* Table of all the compilation units. This is used to locate
270 the target compilation unit of a particular reference. */
271 struct dwarf2_per_cu_data **all_comp_units = NULL;
273 /* The number of compilation units in ALL_COMP_UNITS. */
274 int n_comp_units = 0;
276 /* The number of .debug_types-related CUs. */
277 int n_type_units = 0;
279 /* The number of elements allocated in all_type_units.
280 If there are skeleton-less TUs, we add them to all_type_units lazily. */
281 int n_allocated_type_units = 0;
283 /* The .debug_types-related CUs (TUs).
284 This is stored in malloc space because we may realloc it. */
285 struct signatured_type **all_type_units = NULL;
287 /* Table of struct type_unit_group objects.
288 The hash key is the DW_AT_stmt_list value. */
289 htab_t type_unit_groups {};
291 /* A table mapping .debug_types signatures to its signatured_type entry.
292 This is NULL if the .debug_types section hasn't been read in yet. */
293 htab_t signatured_types {};
295 /* Type unit statistics, to see how well the scaling improvements
297 struct tu_stats tu_stats {};
299 /* A chain of compilation units that are currently read in, so that
300 they can be freed later. */
301 dwarf2_per_cu_data *read_in_chain = NULL;
303 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
304 This is NULL if the table hasn't been allocated yet. */
307 /* True if we've checked for whether there is a DWP file. */
308 bool dwp_checked = false;
310 /* The DWP file if there is one, or NULL. */
311 struct dwp_file *dwp_file = NULL;
313 /* The shared '.dwz' file, if one exists. This is used when the
314 original data was compressed using 'dwz -m'. */
315 struct dwz_file *dwz_file = NULL;
317 /* A flag indicating whether this objfile has a section loaded at a
319 bool has_section_at_zero = false;
321 /* True if we are using the mapped index,
322 or we are faking it for OBJF_READNOW's sake. */
323 bool using_index = false;
325 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
326 mapped_index *index_table = NULL;
328 /* When using index_table, this keeps track of all quick_file_names entries.
329 TUs typically share line table entries with a CU, so we maintain a
330 separate table of all line table entries to support the sharing.
331 Note that while there can be way more TUs than CUs, we've already
332 sorted all the TUs into "type unit groups", grouped by their
333 DW_AT_stmt_list value. Therefore the only sharing done here is with a
334 CU and its associated TU group if there is one. */
335 htab_t quick_file_names_table {};
337 /* Set during partial symbol reading, to prevent queueing of full
339 bool reading_partial_symbols = false;
341 /* Table mapping type DIEs to their struct type *.
342 This is NULL if not allocated yet.
343 The mapping is done via (CU/TU + DIE offset) -> type. */
344 htab_t die_type_hash {};
346 /* The CUs we recently read. */
347 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
349 /* Table containing line_header indexed by offset and offset_in_dwz. */
350 htab_t line_header_hash {};
352 /* Table containing all filenames. This is an optional because the
353 table is lazily constructed on first access. */
354 gdb::optional<filename_seen_cache> filenames_cache;
357 static struct dwarf2_per_objfile *dwarf2_per_objfile;
359 /* Default names of the debugging sections. */
361 /* Note that if the debugging section has been compressed, it might
362 have a name like .zdebug_info. */
364 static const struct dwarf2_debug_sections dwarf2_elf_names =
366 { ".debug_info", ".zdebug_info" },
367 { ".debug_abbrev", ".zdebug_abbrev" },
368 { ".debug_line", ".zdebug_line" },
369 { ".debug_loc", ".zdebug_loc" },
370 { ".debug_loclists", ".zdebug_loclists" },
371 { ".debug_macinfo", ".zdebug_macinfo" },
372 { ".debug_macro", ".zdebug_macro" },
373 { ".debug_str", ".zdebug_str" },
374 { ".debug_line_str", ".zdebug_line_str" },
375 { ".debug_ranges", ".zdebug_ranges" },
376 { ".debug_rnglists", ".zdebug_rnglists" },
377 { ".debug_types", ".zdebug_types" },
378 { ".debug_addr", ".zdebug_addr" },
379 { ".debug_frame", ".zdebug_frame" },
380 { ".eh_frame", NULL },
381 { ".gdb_index", ".zgdb_index" },
385 /* List of DWO/DWP sections. */
387 static const struct dwop_section_names
389 struct dwarf2_section_names abbrev_dwo;
390 struct dwarf2_section_names info_dwo;
391 struct dwarf2_section_names line_dwo;
392 struct dwarf2_section_names loc_dwo;
393 struct dwarf2_section_names loclists_dwo;
394 struct dwarf2_section_names macinfo_dwo;
395 struct dwarf2_section_names macro_dwo;
396 struct dwarf2_section_names str_dwo;
397 struct dwarf2_section_names str_offsets_dwo;
398 struct dwarf2_section_names types_dwo;
399 struct dwarf2_section_names cu_index;
400 struct dwarf2_section_names tu_index;
404 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
405 { ".debug_info.dwo", ".zdebug_info.dwo" },
406 { ".debug_line.dwo", ".zdebug_line.dwo" },
407 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
408 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
409 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
410 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
411 { ".debug_str.dwo", ".zdebug_str.dwo" },
412 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
413 { ".debug_types.dwo", ".zdebug_types.dwo" },
414 { ".debug_cu_index", ".zdebug_cu_index" },
415 { ".debug_tu_index", ".zdebug_tu_index" },
418 /* local data types */
420 /* The data in a compilation unit header, after target2host
421 translation, looks like this. */
422 struct comp_unit_head
426 unsigned char addr_size;
427 unsigned char signed_addr_p;
428 sect_offset abbrev_sect_off;
430 /* Size of file offsets; either 4 or 8. */
431 unsigned int offset_size;
433 /* Size of the length field; either 4 or 12. */
434 unsigned int initial_length_size;
436 enum dwarf_unit_type unit_type;
438 /* Offset to the first byte of this compilation unit header in the
439 .debug_info section, for resolving relative reference dies. */
440 sect_offset sect_off;
442 /* Offset to first die in this cu from the start of the cu.
443 This will be the first byte following the compilation unit header. */
444 cu_offset first_die_cu_offset;
446 /* 64-bit signature of this type unit - it is valid only for
447 UNIT_TYPE DW_UT_type. */
450 /* For types, offset in the type's DIE of the type defined by this TU. */
451 cu_offset type_cu_offset_in_tu;
454 /* Type used for delaying computation of method physnames.
455 See comments for compute_delayed_physnames. */
456 struct delayed_method_info
458 /* The type to which the method is attached, i.e., its parent class. */
461 /* The index of the method in the type's function fieldlists. */
464 /* The index of the method in the fieldlist. */
467 /* The name of the DIE. */
470 /* The DIE associated with this method. */
471 struct die_info *die;
474 typedef struct delayed_method_info delayed_method_info;
475 DEF_VEC_O (delayed_method_info);
477 /* Internal state when decoding a particular compilation unit. */
480 /* The objfile containing this compilation unit. */
481 struct objfile *objfile;
483 /* The header of the compilation unit. */
484 struct comp_unit_head header;
486 /* Base address of this compilation unit. */
487 CORE_ADDR base_address;
489 /* Non-zero if base_address has been set. */
492 /* The language we are debugging. */
493 enum language language;
494 const struct language_defn *language_defn;
496 const char *producer;
498 /* The generic symbol table building routines have separate lists for
499 file scope symbols and all all other scopes (local scopes). So
500 we need to select the right one to pass to add_symbol_to_list().
501 We do it by keeping a pointer to the correct list in list_in_scope.
503 FIXME: The original dwarf code just treated the file scope as the
504 first local scope, and all other local scopes as nested local
505 scopes, and worked fine. Check to see if we really need to
506 distinguish these in buildsym.c. */
507 struct pending **list_in_scope;
509 /* The abbrev table for this CU.
510 Normally this points to the abbrev table in the objfile.
511 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
512 struct abbrev_table *abbrev_table;
514 /* Hash table holding all the loaded partial DIEs
515 with partial_die->offset.SECT_OFF as hash. */
518 /* Storage for things with the same lifetime as this read-in compilation
519 unit, including partial DIEs. */
520 struct obstack comp_unit_obstack;
522 /* When multiple dwarf2_cu structures are living in memory, this field
523 chains them all together, so that they can be released efficiently.
524 We will probably also want a generation counter so that most-recently-used
525 compilation units are cached... */
526 struct dwarf2_per_cu_data *read_in_chain;
528 /* Backlink to our per_cu entry. */
529 struct dwarf2_per_cu_data *per_cu;
531 /* How many compilation units ago was this CU last referenced? */
534 /* A hash table of DIE cu_offset for following references with
535 die_info->offset.sect_off as hash. */
538 /* Full DIEs if read in. */
539 struct die_info *dies;
541 /* A set of pointers to dwarf2_per_cu_data objects for compilation
542 units referenced by this one. Only set during full symbol processing;
543 partial symbol tables do not have dependencies. */
546 /* Header data from the line table, during full symbol processing. */
547 struct line_header *line_header;
548 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
549 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
550 this is the DW_TAG_compile_unit die for this CU. We'll hold on
551 to the line header as long as this DIE is being processed. See
552 process_die_scope. */
553 die_info *line_header_die_owner;
555 /* A list of methods which need to have physnames computed
556 after all type information has been read. */
557 VEC (delayed_method_info) *method_list;
559 /* To be copied to symtab->call_site_htab. */
560 htab_t call_site_htab;
562 /* Non-NULL if this CU came from a DWO file.
563 There is an invariant here that is important to remember:
564 Except for attributes copied from the top level DIE in the "main"
565 (or "stub") file in preparation for reading the DWO file
566 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
567 Either there isn't a DWO file (in which case this is NULL and the point
568 is moot), or there is and either we're not going to read it (in which
569 case this is NULL) or there is and we are reading it (in which case this
571 struct dwo_unit *dwo_unit;
573 /* The DW_AT_addr_base attribute if present, zero otherwise
574 (zero is a valid value though).
575 Note this value comes from the Fission stub CU/TU's DIE. */
578 /* The DW_AT_ranges_base attribute if present, zero otherwise
579 (zero is a valid value though).
580 Note this value comes from the Fission stub CU/TU's DIE.
581 Also note that the value is zero in the non-DWO case so this value can
582 be used without needing to know whether DWO files are in use or not.
583 N.B. This does not apply to DW_AT_ranges appearing in
584 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
585 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
586 DW_AT_ranges_base *would* have to be applied, and we'd have to care
587 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
588 ULONGEST ranges_base;
590 /* Mark used when releasing cached dies. */
591 unsigned int mark : 1;
593 /* This CU references .debug_loc. See the symtab->locations_valid field.
594 This test is imperfect as there may exist optimized debug code not using
595 any location list and still facing inlining issues if handled as
596 unoptimized code. For a future better test see GCC PR other/32998. */
597 unsigned int has_loclist : 1;
599 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
600 if all the producer_is_* fields are valid. This information is cached
601 because profiling CU expansion showed excessive time spent in
602 producer_is_gxx_lt_4_6. */
603 unsigned int checked_producer : 1;
604 unsigned int producer_is_gxx_lt_4_6 : 1;
605 unsigned int producer_is_gcc_lt_4_3 : 1;
606 unsigned int producer_is_icc : 1;
608 /* When set, the file that we're processing is known to have
609 debugging info for C++ namespaces. GCC 3.3.x did not produce
610 this information, but later versions do. */
612 unsigned int processing_has_namespace_info : 1;
615 /* Persistent data held for a compilation unit, even when not
616 processing it. We put a pointer to this structure in the
617 read_symtab_private field of the psymtab. */
619 struct dwarf2_per_cu_data
621 /* The start offset and length of this compilation unit.
622 NOTE: Unlike comp_unit_head.length, this length includes
624 If the DIE refers to a DWO file, this is always of the original die,
626 sect_offset sect_off;
629 /* DWARF standard version this data has been read from (such as 4 or 5). */
632 /* Flag indicating this compilation unit will be read in before
633 any of the current compilation units are processed. */
634 unsigned int queued : 1;
636 /* This flag will be set when reading partial DIEs if we need to load
637 absolutely all DIEs for this compilation unit, instead of just the ones
638 we think are interesting. It gets set if we look for a DIE in the
639 hash table and don't find it. */
640 unsigned int load_all_dies : 1;
642 /* Non-zero if this CU is from .debug_types.
643 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
645 unsigned int is_debug_types : 1;
647 /* Non-zero if this CU is from the .dwz file. */
648 unsigned int is_dwz : 1;
650 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
651 This flag is only valid if is_debug_types is true.
652 We can't read a CU directly from a DWO file: There are required
653 attributes in the stub. */
654 unsigned int reading_dwo_directly : 1;
656 /* Non-zero if the TU has been read.
657 This is used to assist the "Stay in DWO Optimization" for Fission:
658 When reading a DWO, it's faster to read TUs from the DWO instead of
659 fetching them from random other DWOs (due to comdat folding).
660 If the TU has already been read, the optimization is unnecessary
661 (and unwise - we don't want to change where gdb thinks the TU lives
663 This flag is only valid if is_debug_types is true. */
664 unsigned int tu_read : 1;
666 /* The section this CU/TU lives in.
667 If the DIE refers to a DWO file, this is always the original die,
669 struct dwarf2_section_info *section;
671 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
672 of the CU cache it gets reset to NULL again. This is left as NULL for
673 dummy CUs (a CU header, but nothing else). */
674 struct dwarf2_cu *cu;
676 /* The corresponding objfile.
677 Normally we can get the objfile from dwarf2_per_objfile.
678 However we can enter this file with just a "per_cu" handle. */
679 struct objfile *objfile;
681 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
682 is active. Otherwise, the 'psymtab' field is active. */
685 /* The partial symbol table associated with this compilation unit,
686 or NULL for unread partial units. */
687 struct partial_symtab *psymtab;
689 /* Data needed by the "quick" functions. */
690 struct dwarf2_per_cu_quick_data *quick;
693 /* The CUs we import using DW_TAG_imported_unit. This is filled in
694 while reading psymtabs, used to compute the psymtab dependencies,
695 and then cleared. Then it is filled in again while reading full
696 symbols, and only deleted when the objfile is destroyed.
698 This is also used to work around a difference between the way gold
699 generates .gdb_index version <=7 and the way gdb does. Arguably this
700 is a gold bug. For symbols coming from TUs, gold records in the index
701 the CU that includes the TU instead of the TU itself. This breaks
702 dw2_lookup_symbol: It assumes that if the index says symbol X lives
703 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
704 will find X. Alas TUs live in their own symtab, so after expanding CU Y
705 we need to look in TU Z to find X. Fortunately, this is akin to
706 DW_TAG_imported_unit, so we just use the same mechanism: For
707 .gdb_index version <=7 this also records the TUs that the CU referred
708 to. Concurrently with this change gdb was modified to emit version 8
709 indices so we only pay a price for gold generated indices.
710 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
711 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
714 /* Entry in the signatured_types hash table. */
716 struct signatured_type
718 /* The "per_cu" object of this type.
719 This struct is used iff per_cu.is_debug_types.
720 N.B.: This is the first member so that it's easy to convert pointers
722 struct dwarf2_per_cu_data per_cu;
724 /* The type's signature. */
727 /* Offset in the TU of the type's DIE, as read from the TU header.
728 If this TU is a DWO stub and the definition lives in a DWO file
729 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
730 cu_offset type_offset_in_tu;
732 /* Offset in the section of the type's DIE.
733 If the definition lives in a DWO file, this is the offset in the
734 .debug_types.dwo section.
735 The value is zero until the actual value is known.
736 Zero is otherwise not a valid section offset. */
737 sect_offset type_offset_in_section;
739 /* Type units are grouped by their DW_AT_stmt_list entry so that they
740 can share them. This points to the containing symtab. */
741 struct type_unit_group *type_unit_group;
744 The first time we encounter this type we fully read it in and install it
745 in the symbol tables. Subsequent times we only need the type. */
748 /* Containing DWO unit.
749 This field is valid iff per_cu.reading_dwo_directly. */
750 struct dwo_unit *dwo_unit;
753 typedef struct signatured_type *sig_type_ptr;
754 DEF_VEC_P (sig_type_ptr);
756 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
757 This includes type_unit_group and quick_file_names. */
759 struct stmt_list_hash
761 /* The DWO unit this table is from or NULL if there is none. */
762 struct dwo_unit *dwo_unit;
764 /* Offset in .debug_line or .debug_line.dwo. */
765 sect_offset line_sect_off;
768 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
769 an object of this type. */
771 struct type_unit_group
773 /* dwarf2read.c's main "handle" on a TU symtab.
774 To simplify things we create an artificial CU that "includes" all the
775 type units using this stmt_list so that the rest of the code still has
776 a "per_cu" handle on the symtab.
777 This PER_CU is recognized by having no section. */
778 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
779 struct dwarf2_per_cu_data per_cu;
781 /* The TUs that share this DW_AT_stmt_list entry.
782 This is added to while parsing type units to build partial symtabs,
783 and is deleted afterwards and not used again. */
784 VEC (sig_type_ptr) *tus;
786 /* The compunit symtab.
787 Type units in a group needn't all be defined in the same source file,
788 so we create an essentially anonymous symtab as the compunit symtab. */
789 struct compunit_symtab *compunit_symtab;
791 /* The data used to construct the hash key. */
792 struct stmt_list_hash hash;
794 /* The number of symtabs from the line header.
795 The value here must match line_header.num_file_names. */
796 unsigned int num_symtabs;
798 /* The symbol tables for this TU (obtained from the files listed in
800 WARNING: The order of entries here must match the order of entries
801 in the line header. After the first TU using this type_unit_group, the
802 line header for the subsequent TUs is recreated from this. This is done
803 because we need to use the same symtabs for each TU using the same
804 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
805 there's no guarantee the line header doesn't have duplicate entries. */
806 struct symtab **symtabs;
809 /* These sections are what may appear in a (real or virtual) DWO file. */
813 struct dwarf2_section_info abbrev;
814 struct dwarf2_section_info line;
815 struct dwarf2_section_info loc;
816 struct dwarf2_section_info loclists;
817 struct dwarf2_section_info macinfo;
818 struct dwarf2_section_info macro;
819 struct dwarf2_section_info str;
820 struct dwarf2_section_info str_offsets;
821 /* In the case of a virtual DWO file, these two are unused. */
822 struct dwarf2_section_info info;
823 VEC (dwarf2_section_info_def) *types;
826 /* CUs/TUs in DWP/DWO files. */
830 /* Backlink to the containing struct dwo_file. */
831 struct dwo_file *dwo_file;
833 /* The "id" that distinguishes this CU/TU.
834 .debug_info calls this "dwo_id", .debug_types calls this "signature".
835 Since signatures came first, we stick with it for consistency. */
838 /* The section this CU/TU lives in, in the DWO file. */
839 struct dwarf2_section_info *section;
841 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
842 sect_offset sect_off;
845 /* For types, offset in the type's DIE of the type defined by this TU. */
846 cu_offset type_offset_in_tu;
849 /* include/dwarf2.h defines the DWP section codes.
850 It defines a max value but it doesn't define a min value, which we
851 use for error checking, so provide one. */
853 enum dwp_v2_section_ids
858 /* Data for one DWO file.
860 This includes virtual DWO files (a virtual DWO file is a DWO file as it
861 appears in a DWP file). DWP files don't really have DWO files per se -
862 comdat folding of types "loses" the DWO file they came from, and from
863 a high level view DWP files appear to contain a mass of random types.
864 However, to maintain consistency with the non-DWP case we pretend DWP
865 files contain virtual DWO files, and we assign each TU with one virtual
866 DWO file (generally based on the line and abbrev section offsets -
867 a heuristic that seems to work in practice). */
871 /* The DW_AT_GNU_dwo_name attribute.
872 For virtual DWO files the name is constructed from the section offsets
873 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
874 from related CU+TUs. */
875 const char *dwo_name;
877 /* The DW_AT_comp_dir attribute. */
878 const char *comp_dir;
880 /* The bfd, when the file is open. Otherwise this is NULL.
881 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
884 /* The sections that make up this DWO file.
885 Remember that for virtual DWO files in DWP V2, these are virtual
886 sections (for lack of a better name). */
887 struct dwo_sections sections;
889 /* The CUs in the file.
890 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
891 an extension to handle LLVM's Link Time Optimization output (where
892 multiple source files may be compiled into a single object/dwo pair). */
895 /* Table of TUs in the file.
896 Each element is a struct dwo_unit. */
900 /* These sections are what may appear in a DWP file. */
904 /* These are used by both DWP version 1 and 2. */
905 struct dwarf2_section_info str;
906 struct dwarf2_section_info cu_index;
907 struct dwarf2_section_info tu_index;
909 /* These are only used by DWP version 2 files.
910 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
911 sections are referenced by section number, and are not recorded here.
912 In DWP version 2 there is at most one copy of all these sections, each
913 section being (effectively) comprised of the concatenation of all of the
914 individual sections that exist in the version 1 format.
915 To keep the code simple we treat each of these concatenated pieces as a
916 section itself (a virtual section?). */
917 struct dwarf2_section_info abbrev;
918 struct dwarf2_section_info info;
919 struct dwarf2_section_info line;
920 struct dwarf2_section_info loc;
921 struct dwarf2_section_info macinfo;
922 struct dwarf2_section_info macro;
923 struct dwarf2_section_info str_offsets;
924 struct dwarf2_section_info types;
927 /* These sections are what may appear in a virtual DWO file in DWP version 1.
928 A virtual DWO file is a DWO file as it appears in a DWP file. */
930 struct virtual_v1_dwo_sections
932 struct dwarf2_section_info abbrev;
933 struct dwarf2_section_info line;
934 struct dwarf2_section_info loc;
935 struct dwarf2_section_info macinfo;
936 struct dwarf2_section_info macro;
937 struct dwarf2_section_info str_offsets;
938 /* Each DWP hash table entry records one CU or one TU.
939 That is recorded here, and copied to dwo_unit.section. */
940 struct dwarf2_section_info info_or_types;
943 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
944 In version 2, the sections of the DWO files are concatenated together
945 and stored in one section of that name. Thus each ELF section contains
946 several "virtual" sections. */
948 struct virtual_v2_dwo_sections
950 bfd_size_type abbrev_offset;
951 bfd_size_type abbrev_size;
953 bfd_size_type line_offset;
954 bfd_size_type line_size;
956 bfd_size_type loc_offset;
957 bfd_size_type loc_size;
959 bfd_size_type macinfo_offset;
960 bfd_size_type macinfo_size;
962 bfd_size_type macro_offset;
963 bfd_size_type macro_size;
965 bfd_size_type str_offsets_offset;
966 bfd_size_type str_offsets_size;
968 /* Each DWP hash table entry records one CU or one TU.
969 That is recorded here, and copied to dwo_unit.section. */
970 bfd_size_type info_or_types_offset;
971 bfd_size_type info_or_types_size;
974 /* Contents of DWP hash tables. */
976 struct dwp_hash_table
978 uint32_t version, nr_columns;
979 uint32_t nr_units, nr_slots;
980 const gdb_byte *hash_table, *unit_table;
985 const gdb_byte *indices;
989 /* This is indexed by column number and gives the id of the section
991 #define MAX_NR_V2_DWO_SECTIONS \
992 (1 /* .debug_info or .debug_types */ \
993 + 1 /* .debug_abbrev */ \
994 + 1 /* .debug_line */ \
995 + 1 /* .debug_loc */ \
996 + 1 /* .debug_str_offsets */ \
997 + 1 /* .debug_macro or .debug_macinfo */)
998 int section_ids[MAX_NR_V2_DWO_SECTIONS];
999 const gdb_byte *offsets;
1000 const gdb_byte *sizes;
1005 /* Data for one DWP file. */
1009 /* Name of the file. */
1012 /* File format version. */
1018 /* Section info for this file. */
1019 struct dwp_sections sections;
1021 /* Table of CUs in the file. */
1022 const struct dwp_hash_table *cus;
1024 /* Table of TUs in the file. */
1025 const struct dwp_hash_table *tus;
1027 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1031 /* Table to map ELF section numbers to their sections.
1032 This is only needed for the DWP V1 file format. */
1033 unsigned int num_sections;
1034 asection **elf_sections;
1037 /* This represents a '.dwz' file. */
1041 /* A dwz file can only contain a few sections. */
1042 struct dwarf2_section_info abbrev;
1043 struct dwarf2_section_info info;
1044 struct dwarf2_section_info str;
1045 struct dwarf2_section_info line;
1046 struct dwarf2_section_info macro;
1047 struct dwarf2_section_info gdb_index;
1049 /* The dwz's BFD. */
1053 /* Struct used to pass misc. parameters to read_die_and_children, et
1054 al. which are used for both .debug_info and .debug_types dies.
1055 All parameters here are unchanging for the life of the call. This
1056 struct exists to abstract away the constant parameters of die reading. */
1058 struct die_reader_specs
1060 /* The bfd of die_section. */
1063 /* The CU of the DIE we are parsing. */
1064 struct dwarf2_cu *cu;
1066 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1067 struct dwo_file *dwo_file;
1069 /* The section the die comes from.
1070 This is either .debug_info or .debug_types, or the .dwo variants. */
1071 struct dwarf2_section_info *die_section;
1073 /* die_section->buffer. */
1074 const gdb_byte *buffer;
1076 /* The end of the buffer. */
1077 const gdb_byte *buffer_end;
1079 /* The value of the DW_AT_comp_dir attribute. */
1080 const char *comp_dir;
1083 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1084 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1085 const gdb_byte *info_ptr,
1086 struct die_info *comp_unit_die,
1090 /* A 1-based directory index. This is a strong typedef to prevent
1091 accidentally using a directory index as a 0-based index into an
1093 enum class dir_index : unsigned int {};
1095 /* Likewise, a 1-based file name index. */
1096 enum class file_name_index : unsigned int {};
1100 file_entry () = default;
1102 file_entry (const char *name_, dir_index d_index_,
1103 unsigned int mod_time_, unsigned int length_)
1106 mod_time (mod_time_),
1110 /* Return the include directory at D_INDEX stored in LH. Returns
1111 NULL if D_INDEX is out of bounds. */
1112 const char *include_dir (const line_header *lh) const;
1114 /* The file name. Note this is an observing pointer. The memory is
1115 owned by debug_line_buffer. */
1116 const char *name {};
1118 /* The directory index (1-based). */
1119 dir_index d_index {};
1121 unsigned int mod_time {};
1123 unsigned int length {};
1125 /* True if referenced by the Line Number Program. */
1128 /* The associated symbol table, if any. */
1129 struct symtab *symtab {};
1132 /* The line number information for a compilation unit (found in the
1133 .debug_line section) begins with a "statement program header",
1134 which contains the following information. */
1141 /* Add an entry to the include directory table. */
1142 void add_include_dir (const char *include_dir);
1144 /* Add an entry to the file name table. */
1145 void add_file_name (const char *name, dir_index d_index,
1146 unsigned int mod_time, unsigned int length);
1148 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1149 is out of bounds. */
1150 const char *include_dir_at (dir_index index) const
1152 /* Convert directory index number (1-based) to vector index
1154 size_t vec_index = to_underlying (index) - 1;
1156 if (vec_index >= include_dirs.size ())
1158 return include_dirs[vec_index];
1161 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1162 is out of bounds. */
1163 file_entry *file_name_at (file_name_index index)
1165 /* Convert file name index number (1-based) to vector index
1167 size_t vec_index = to_underlying (index) - 1;
1169 if (vec_index >= file_names.size ())
1171 return &file_names[vec_index];
1174 /* Const version of the above. */
1175 const file_entry *file_name_at (unsigned int index) const
1177 if (index >= file_names.size ())
1179 return &file_names[index];
1182 /* Offset of line number information in .debug_line section. */
1183 sect_offset sect_off {};
1185 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1186 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1188 unsigned int total_length {};
1189 unsigned short version {};
1190 unsigned int header_length {};
1191 unsigned char minimum_instruction_length {};
1192 unsigned char maximum_ops_per_instruction {};
1193 unsigned char default_is_stmt {};
1195 unsigned char line_range {};
1196 unsigned char opcode_base {};
1198 /* standard_opcode_lengths[i] is the number of operands for the
1199 standard opcode whose value is i. This means that
1200 standard_opcode_lengths[0] is unused, and the last meaningful
1201 element is standard_opcode_lengths[opcode_base - 1]. */
1202 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1204 /* The include_directories table. Note these are observing
1205 pointers. The memory is owned by debug_line_buffer. */
1206 std::vector<const char *> include_dirs;
1208 /* The file_names table. */
1209 std::vector<file_entry> file_names;
1211 /* The start and end of the statement program following this
1212 header. These point into dwarf2_per_objfile->line_buffer. */
1213 const gdb_byte *statement_program_start {}, *statement_program_end {};
1216 typedef std::unique_ptr<line_header> line_header_up;
1219 file_entry::include_dir (const line_header *lh) const
1221 return lh->include_dir_at (d_index);
1224 /* When we construct a partial symbol table entry we only
1225 need this much information. */
1226 struct partial_die_info
1228 /* Offset of this DIE. */
1229 sect_offset sect_off;
1231 /* DWARF-2 tag for this DIE. */
1232 ENUM_BITFIELD(dwarf_tag) tag : 16;
1234 /* Assorted flags describing the data found in this DIE. */
1235 unsigned int has_children : 1;
1236 unsigned int is_external : 1;
1237 unsigned int is_declaration : 1;
1238 unsigned int has_type : 1;
1239 unsigned int has_specification : 1;
1240 unsigned int has_pc_info : 1;
1241 unsigned int may_be_inlined : 1;
1243 /* This DIE has been marked DW_AT_main_subprogram. */
1244 unsigned int main_subprogram : 1;
1246 /* Flag set if the SCOPE field of this structure has been
1248 unsigned int scope_set : 1;
1250 /* Flag set if the DIE has a byte_size attribute. */
1251 unsigned int has_byte_size : 1;
1253 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1254 unsigned int has_const_value : 1;
1256 /* Flag set if any of the DIE's children are template arguments. */
1257 unsigned int has_template_arguments : 1;
1259 /* Flag set if fixup_partial_die has been called on this die. */
1260 unsigned int fixup_called : 1;
1262 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1263 unsigned int is_dwz : 1;
1265 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1266 unsigned int spec_is_dwz : 1;
1268 /* The name of this DIE. Normally the value of DW_AT_name, but
1269 sometimes a default name for unnamed DIEs. */
1272 /* The linkage name, if present. */
1273 const char *linkage_name;
1275 /* The scope to prepend to our children. This is generally
1276 allocated on the comp_unit_obstack, so will disappear
1277 when this compilation unit leaves the cache. */
1280 /* Some data associated with the partial DIE. The tag determines
1281 which field is live. */
1284 /* The location description associated with this DIE, if any. */
1285 struct dwarf_block *locdesc;
1286 /* The offset of an import, for DW_TAG_imported_unit. */
1287 sect_offset sect_off;
1290 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1294 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1295 DW_AT_sibling, if any. */
1296 /* NOTE: This member isn't strictly necessary, read_partial_die could
1297 return DW_AT_sibling values to its caller load_partial_dies. */
1298 const gdb_byte *sibling;
1300 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1301 DW_AT_specification (or DW_AT_abstract_origin or
1302 DW_AT_extension). */
1303 sect_offset spec_offset;
1305 /* Pointers to this DIE's parent, first child, and next sibling,
1307 struct partial_die_info *die_parent, *die_child, *die_sibling;
1310 /* This data structure holds the information of an abbrev. */
1313 unsigned int number; /* number identifying abbrev */
1314 enum dwarf_tag tag; /* dwarf tag */
1315 unsigned short has_children; /* boolean */
1316 unsigned short num_attrs; /* number of attributes */
1317 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1318 struct abbrev_info *next; /* next in chain */
1323 ENUM_BITFIELD(dwarf_attribute) name : 16;
1324 ENUM_BITFIELD(dwarf_form) form : 16;
1326 /* It is valid only if FORM is DW_FORM_implicit_const. */
1327 LONGEST implicit_const;
1330 /* Size of abbrev_table.abbrev_hash_table. */
1331 #define ABBREV_HASH_SIZE 121
1333 /* Top level data structure to contain an abbreviation table. */
1337 /* Where the abbrev table came from.
1338 This is used as a sanity check when the table is used. */
1339 sect_offset sect_off;
1341 /* Storage for the abbrev table. */
1342 struct obstack abbrev_obstack;
1344 /* Hash table of abbrevs.
1345 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1346 It could be statically allocated, but the previous code didn't so we
1348 struct abbrev_info **abbrevs;
1351 /* Attributes have a name and a value. */
1354 ENUM_BITFIELD(dwarf_attribute) name : 16;
1355 ENUM_BITFIELD(dwarf_form) form : 15;
1357 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1358 field should be in u.str (existing only for DW_STRING) but it is kept
1359 here for better struct attribute alignment. */
1360 unsigned int string_is_canonical : 1;
1365 struct dwarf_block *blk;
1374 /* This data structure holds a complete die structure. */
1377 /* DWARF-2 tag for this DIE. */
1378 ENUM_BITFIELD(dwarf_tag) tag : 16;
1380 /* Number of attributes */
1381 unsigned char num_attrs;
1383 /* True if we're presently building the full type name for the
1384 type derived from this DIE. */
1385 unsigned char building_fullname : 1;
1387 /* True if this die is in process. PR 16581. */
1388 unsigned char in_process : 1;
1391 unsigned int abbrev;
1393 /* Offset in .debug_info or .debug_types section. */
1394 sect_offset sect_off;
1396 /* The dies in a compilation unit form an n-ary tree. PARENT
1397 points to this die's parent; CHILD points to the first child of
1398 this node; and all the children of a given node are chained
1399 together via their SIBLING fields. */
1400 struct die_info *child; /* Its first child, if any. */
1401 struct die_info *sibling; /* Its next sibling, if any. */
1402 struct die_info *parent; /* Its parent, if any. */
1404 /* An array of attributes, with NUM_ATTRS elements. There may be
1405 zero, but it's not common and zero-sized arrays are not
1406 sufficiently portable C. */
1407 struct attribute attrs[1];
1410 /* Get at parts of an attribute structure. */
1412 #define DW_STRING(attr) ((attr)->u.str)
1413 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1414 #define DW_UNSND(attr) ((attr)->u.unsnd)
1415 #define DW_BLOCK(attr) ((attr)->u.blk)
1416 #define DW_SND(attr) ((attr)->u.snd)
1417 #define DW_ADDR(attr) ((attr)->u.addr)
1418 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1420 /* Blocks are a bunch of untyped bytes. */
1425 /* Valid only if SIZE is not zero. */
1426 const gdb_byte *data;
1429 #ifndef ATTR_ALLOC_CHUNK
1430 #define ATTR_ALLOC_CHUNK 4
1433 /* Allocate fields for structs, unions and enums in this size. */
1434 #ifndef DW_FIELD_ALLOC_CHUNK
1435 #define DW_FIELD_ALLOC_CHUNK 4
1438 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1439 but this would require a corresponding change in unpack_field_as_long
1441 static int bits_per_byte = 8;
1445 struct nextfield *next;
1453 struct nextfnfield *next;
1454 struct fn_field fnfield;
1461 struct nextfnfield *head;
1464 struct typedef_field_list
1466 struct typedef_field field;
1467 struct typedef_field_list *next;
1470 /* The routines that read and process dies for a C struct or C++ class
1471 pass lists of data member fields and lists of member function fields
1472 in an instance of a field_info structure, as defined below. */
1475 /* List of data member and baseclasses fields. */
1476 struct nextfield *fields, *baseclasses;
1478 /* Number of fields (including baseclasses). */
1481 /* Number of baseclasses. */
1484 /* Set if the accesibility of one of the fields is not public. */
1485 int non_public_fields;
1487 /* Member function fieldlist array, contains name of possibly overloaded
1488 member function, number of overloaded member functions and a pointer
1489 to the head of the member function field chain. */
1490 struct fnfieldlist *fnfieldlists;
1492 /* Number of entries in the fnfieldlists array. */
1495 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1496 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1497 struct typedef_field_list *typedef_field_list;
1498 unsigned typedef_field_list_count;
1501 /* One item on the queue of compilation units to read in full symbols
1503 struct dwarf2_queue_item
1505 struct dwarf2_per_cu_data *per_cu;
1506 enum language pretend_language;
1507 struct dwarf2_queue_item *next;
1510 /* The current queue. */
1511 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1513 /* Loaded secondary compilation units are kept in memory until they
1514 have not been referenced for the processing of this many
1515 compilation units. Set this to zero to disable caching. Cache
1516 sizes of up to at least twenty will improve startup time for
1517 typical inter-CU-reference binaries, at an obvious memory cost. */
1518 static int dwarf_max_cache_age = 5;
1520 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1521 struct cmd_list_element *c, const char *value)
1523 fprintf_filtered (file, _("The upper bound on the age of cached "
1524 "DWARF compilation units is %s.\n"),
1528 /* local function prototypes */
1530 static const char *get_section_name (const struct dwarf2_section_info *);
1532 static const char *get_section_file_name (const struct dwarf2_section_info *);
1534 static void dwarf2_find_base_address (struct die_info *die,
1535 struct dwarf2_cu *cu);
1537 static struct partial_symtab *create_partial_symtab
1538 (struct dwarf2_per_cu_data *per_cu, const char *name);
1540 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1541 const gdb_byte *info_ptr,
1542 struct die_info *type_unit_die,
1543 int has_children, void *data);
1545 static void dwarf2_build_psymtabs_hard (struct objfile *);
1547 static void scan_partial_symbols (struct partial_die_info *,
1548 CORE_ADDR *, CORE_ADDR *,
1549 int, struct dwarf2_cu *);
1551 static void add_partial_symbol (struct partial_die_info *,
1552 struct dwarf2_cu *);
1554 static void add_partial_namespace (struct partial_die_info *pdi,
1555 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1556 int set_addrmap, struct dwarf2_cu *cu);
1558 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1559 CORE_ADDR *highpc, int set_addrmap,
1560 struct dwarf2_cu *cu);
1562 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1563 struct dwarf2_cu *cu);
1565 static void add_partial_subprogram (struct partial_die_info *pdi,
1566 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1567 int need_pc, struct dwarf2_cu *cu);
1569 static void dwarf2_read_symtab (struct partial_symtab *,
1572 static void psymtab_to_symtab_1 (struct partial_symtab *);
1574 static struct abbrev_info *abbrev_table_lookup_abbrev
1575 (const struct abbrev_table *, unsigned int);
1577 static struct abbrev_table *abbrev_table_read_table
1578 (struct dwarf2_section_info *, sect_offset);
1580 static void abbrev_table_free (struct abbrev_table *);
1582 static void abbrev_table_free_cleanup (void *);
1584 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1585 struct dwarf2_section_info *);
1587 static void dwarf2_free_abbrev_table (void *);
1589 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1591 static struct partial_die_info *load_partial_dies
1592 (const struct die_reader_specs *, const gdb_byte *, int);
1594 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1595 struct partial_die_info *,
1596 struct abbrev_info *,
1600 static struct partial_die_info *find_partial_die (sect_offset, int,
1601 struct dwarf2_cu *);
1603 static void fixup_partial_die (struct partial_die_info *,
1604 struct dwarf2_cu *);
1606 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1607 struct attribute *, struct attr_abbrev *,
1610 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1612 static int read_1_signed_byte (bfd *, const gdb_byte *);
1614 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1616 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1618 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1620 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1623 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1625 static LONGEST read_checked_initial_length_and_offset
1626 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1627 unsigned int *, unsigned int *);
1629 static LONGEST read_offset (bfd *, const gdb_byte *,
1630 const struct comp_unit_head *,
1633 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1635 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1638 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1640 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1642 static const char *read_indirect_string (bfd *, const gdb_byte *,
1643 const struct comp_unit_head *,
1646 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1647 const struct comp_unit_head *,
1650 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1652 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1654 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1658 static const char *read_str_index (const struct die_reader_specs *reader,
1659 ULONGEST str_index);
1661 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1663 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1664 struct dwarf2_cu *);
1666 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1669 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1670 struct dwarf2_cu *cu);
1672 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1673 struct dwarf2_cu *cu);
1675 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1677 static struct die_info *die_specification (struct die_info *die,
1678 struct dwarf2_cu **);
1680 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1681 struct dwarf2_cu *cu);
1683 static void dwarf_decode_lines (struct line_header *, const char *,
1684 struct dwarf2_cu *, struct partial_symtab *,
1685 CORE_ADDR, int decode_mapping);
1687 static void dwarf2_start_subfile (const char *, const char *);
1689 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1690 const char *, const char *,
1693 static struct symbol *new_symbol (struct die_info *, struct type *,
1694 struct dwarf2_cu *);
1696 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1697 struct dwarf2_cu *, struct symbol *);
1699 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1700 struct dwarf2_cu *);
1702 static void dwarf2_const_value_attr (const struct attribute *attr,
1705 struct obstack *obstack,
1706 struct dwarf2_cu *cu, LONGEST *value,
1707 const gdb_byte **bytes,
1708 struct dwarf2_locexpr_baton **baton);
1710 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1712 static int need_gnat_info (struct dwarf2_cu *);
1714 static struct type *die_descriptive_type (struct die_info *,
1715 struct dwarf2_cu *);
1717 static void set_descriptive_type (struct type *, struct die_info *,
1718 struct dwarf2_cu *);
1720 static struct type *die_containing_type (struct die_info *,
1721 struct dwarf2_cu *);
1723 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1724 struct dwarf2_cu *);
1726 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1728 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1730 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1732 static char *typename_concat (struct obstack *obs, const char *prefix,
1733 const char *suffix, int physname,
1734 struct dwarf2_cu *cu);
1736 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1738 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1740 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1742 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1744 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1746 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1747 struct dwarf2_cu *, struct partial_symtab *);
1749 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1750 values. Keep the items ordered with increasing constraints compliance. */
1753 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1754 PC_BOUNDS_NOT_PRESENT,
1756 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1757 were present but they do not form a valid range of PC addresses. */
1760 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1763 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1767 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1768 CORE_ADDR *, CORE_ADDR *,
1770 struct partial_symtab *);
1772 static void get_scope_pc_bounds (struct die_info *,
1773 CORE_ADDR *, CORE_ADDR *,
1774 struct dwarf2_cu *);
1776 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1777 CORE_ADDR, struct dwarf2_cu *);
1779 static void dwarf2_add_field (struct field_info *, struct die_info *,
1780 struct dwarf2_cu *);
1782 static void dwarf2_attach_fields_to_type (struct field_info *,
1783 struct type *, struct dwarf2_cu *);
1785 static void dwarf2_add_member_fn (struct field_info *,
1786 struct die_info *, struct type *,
1787 struct dwarf2_cu *);
1789 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1791 struct dwarf2_cu *);
1793 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1795 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1797 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1799 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1801 static struct using_direct **using_directives (enum language);
1803 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1805 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1807 static struct type *read_module_type (struct die_info *die,
1808 struct dwarf2_cu *cu);
1810 static const char *namespace_name (struct die_info *die,
1811 int *is_anonymous, struct dwarf2_cu *);
1813 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1815 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1817 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1818 struct dwarf2_cu *);
1820 static struct die_info *read_die_and_siblings_1
1821 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1824 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1825 const gdb_byte *info_ptr,
1826 const gdb_byte **new_info_ptr,
1827 struct die_info *parent);
1829 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1830 struct die_info **, const gdb_byte *,
1833 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1834 struct die_info **, const gdb_byte *,
1837 static void process_die (struct die_info *, struct dwarf2_cu *);
1839 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1842 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1844 static const char *dwarf2_full_name (const char *name,
1845 struct die_info *die,
1846 struct dwarf2_cu *cu);
1848 static const char *dwarf2_physname (const char *name, struct die_info *die,
1849 struct dwarf2_cu *cu);
1851 static struct die_info *dwarf2_extension (struct die_info *die,
1852 struct dwarf2_cu **);
1854 static const char *dwarf_tag_name (unsigned int);
1856 static const char *dwarf_attr_name (unsigned int);
1858 static const char *dwarf_form_name (unsigned int);
1860 static const char *dwarf_bool_name (unsigned int);
1862 static const char *dwarf_type_encoding_name (unsigned int);
1864 static struct die_info *sibling_die (struct die_info *);
1866 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1868 static void dump_die_for_error (struct die_info *);
1870 static void dump_die_1 (struct ui_file *, int level, int max_level,
1873 /*static*/ void dump_die (struct die_info *, int max_level);
1875 static void store_in_ref_table (struct die_info *,
1876 struct dwarf2_cu *);
1878 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1880 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1882 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1883 const struct attribute *,
1884 struct dwarf2_cu **);
1886 static struct die_info *follow_die_ref (struct die_info *,
1887 const struct attribute *,
1888 struct dwarf2_cu **);
1890 static struct die_info *follow_die_sig (struct die_info *,
1891 const struct attribute *,
1892 struct dwarf2_cu **);
1894 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1895 struct dwarf2_cu *);
1897 static struct type *get_DW_AT_signature_type (struct die_info *,
1898 const struct attribute *,
1899 struct dwarf2_cu *);
1901 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1903 static void read_signatured_type (struct signatured_type *);
1905 static int attr_to_dynamic_prop (const struct attribute *attr,
1906 struct die_info *die, struct dwarf2_cu *cu,
1907 struct dynamic_prop *prop);
1909 /* memory allocation interface */
1911 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1913 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1915 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1917 static int attr_form_is_block (const struct attribute *);
1919 static int attr_form_is_section_offset (const struct attribute *);
1921 static int attr_form_is_constant (const struct attribute *);
1923 static int attr_form_is_ref (const struct attribute *);
1925 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1926 struct dwarf2_loclist_baton *baton,
1927 const struct attribute *attr);
1929 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1931 struct dwarf2_cu *cu,
1934 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1935 const gdb_byte *info_ptr,
1936 struct abbrev_info *abbrev);
1938 static void free_stack_comp_unit (void *);
1940 static hashval_t partial_die_hash (const void *item);
1942 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1944 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1945 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
1947 static void init_one_comp_unit (struct dwarf2_cu *cu,
1948 struct dwarf2_per_cu_data *per_cu);
1950 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1951 struct die_info *comp_unit_die,
1952 enum language pretend_language);
1954 static void free_heap_comp_unit (void *);
1956 static void free_cached_comp_units (void *);
1958 static void age_cached_comp_units (void);
1960 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1962 static struct type *set_die_type (struct die_info *, struct type *,
1963 struct dwarf2_cu *);
1965 static void create_all_comp_units (struct objfile *);
1967 static int create_all_type_units (struct objfile *);
1969 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1972 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1975 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1978 static void dwarf2_add_dependence (struct dwarf2_cu *,
1979 struct dwarf2_per_cu_data *);
1981 static void dwarf2_mark (struct dwarf2_cu *);
1983 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1985 static struct type *get_die_type_at_offset (sect_offset,
1986 struct dwarf2_per_cu_data *);
1988 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1990 static void dwarf2_release_queue (void *dummy);
1992 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1993 enum language pretend_language);
1995 static void process_queue (void);
1997 /* The return type of find_file_and_directory. Note, the enclosed
1998 string pointers are only valid while this object is valid. */
2000 struct file_and_directory
2002 /* The filename. This is never NULL. */
2005 /* The compilation directory. NULL if not known. If we needed to
2006 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2007 points directly to the DW_AT_comp_dir string attribute owned by
2008 the obstack that owns the DIE. */
2009 const char *comp_dir;
2011 /* If we needed to build a new string for comp_dir, this is what
2012 owns the storage. */
2013 std::string comp_dir_storage;
2016 static file_and_directory find_file_and_directory (struct die_info *die,
2017 struct dwarf2_cu *cu);
2019 static char *file_full_name (int file, struct line_header *lh,
2020 const char *comp_dir);
2022 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2023 enum class rcuh_kind { COMPILE, TYPE };
2025 static const gdb_byte *read_and_check_comp_unit_head
2026 (struct comp_unit_head *header,
2027 struct dwarf2_section_info *section,
2028 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2029 rcuh_kind section_kind);
2031 static void init_cutu_and_read_dies
2032 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2033 int use_existing_cu, int keep,
2034 die_reader_func_ftype *die_reader_func, void *data);
2036 static void init_cutu_and_read_dies_simple
2037 (struct dwarf2_per_cu_data *this_cu,
2038 die_reader_func_ftype *die_reader_func, void *data);
2040 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2042 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2044 static struct dwo_unit *lookup_dwo_unit_in_dwp
2045 (struct dwp_file *dwp_file, const char *comp_dir,
2046 ULONGEST signature, int is_debug_types);
2048 static struct dwp_file *get_dwp_file (void);
2050 static struct dwo_unit *lookup_dwo_comp_unit
2051 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2053 static struct dwo_unit *lookup_dwo_type_unit
2054 (struct signatured_type *, const char *, const char *);
2056 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2058 static void free_dwo_file_cleanup (void *);
2060 static void process_cu_includes (void);
2062 static void check_producer (struct dwarf2_cu *cu);
2064 static void free_line_header_voidp (void *arg);
2066 /* Various complaints about symbol reading that don't abort the process. */
2069 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2071 complaint (&symfile_complaints,
2072 _("statement list doesn't fit in .debug_line section"));
2076 dwarf2_debug_line_missing_file_complaint (void)
2078 complaint (&symfile_complaints,
2079 _(".debug_line section has line data without a file"));
2083 dwarf2_debug_line_missing_end_sequence_complaint (void)
2085 complaint (&symfile_complaints,
2086 _(".debug_line section has line "
2087 "program sequence without an end"));
2091 dwarf2_complex_location_expr_complaint (void)
2093 complaint (&symfile_complaints, _("location expression too complex"));
2097 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2100 complaint (&symfile_complaints,
2101 _("const value length mismatch for '%s', got %d, expected %d"),
2106 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2108 complaint (&symfile_complaints,
2109 _("debug info runs off end of %s section"
2111 get_section_name (section),
2112 get_section_file_name (section));
2116 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2118 complaint (&symfile_complaints,
2119 _("macro debug info contains a "
2120 "malformed macro definition:\n`%s'"),
2125 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2127 complaint (&symfile_complaints,
2128 _("invalid attribute class or form for '%s' in '%s'"),
2132 /* Hash function for line_header_hash. */
2135 line_header_hash (const struct line_header *ofs)
2137 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2140 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2143 line_header_hash_voidp (const void *item)
2145 const struct line_header *ofs = (const struct line_header *) item;
2147 return line_header_hash (ofs);
2150 /* Equality function for line_header_hash. */
2153 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2155 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2156 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2158 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2159 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2165 /* Convert VALUE between big- and little-endian. */
2167 byte_swap (offset_type value)
2171 result = (value & 0xff) << 24;
2172 result |= (value & 0xff00) << 8;
2173 result |= (value & 0xff0000) >> 8;
2174 result |= (value & 0xff000000) >> 24;
2178 #define MAYBE_SWAP(V) byte_swap (V)
2181 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
2182 #endif /* WORDS_BIGENDIAN */
2184 /* Read the given attribute value as an address, taking the attribute's
2185 form into account. */
2188 attr_value_as_address (struct attribute *attr)
2192 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2194 /* Aside from a few clearly defined exceptions, attributes that
2195 contain an address must always be in DW_FORM_addr form.
2196 Unfortunately, some compilers happen to be violating this
2197 requirement by encoding addresses using other forms, such
2198 as DW_FORM_data4 for example. For those broken compilers,
2199 we try to do our best, without any guarantee of success,
2200 to interpret the address correctly. It would also be nice
2201 to generate a complaint, but that would require us to maintain
2202 a list of legitimate cases where a non-address form is allowed,
2203 as well as update callers to pass in at least the CU's DWARF
2204 version. This is more overhead than what we're willing to
2205 expand for a pretty rare case. */
2206 addr = DW_UNSND (attr);
2209 addr = DW_ADDR (attr);
2214 /* The suffix for an index file. */
2215 #define INDEX_SUFFIX ".gdb-index"
2217 /* See declaration. */
2219 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2220 const dwarf2_debug_sections *names)
2221 : objfile (objfile_)
2224 names = &dwarf2_elf_names;
2226 bfd *obfd = objfile->obfd;
2228 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2229 locate_sections (obfd, sec, *names);
2232 dwarf2_per_objfile::~dwarf2_per_objfile ()
2234 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2235 free_cached_comp_units ();
2237 if (quick_file_names_table)
2238 htab_delete (quick_file_names_table);
2240 if (line_header_hash)
2241 htab_delete (line_header_hash);
2243 /* Everything else should be on the objfile obstack. */
2246 /* See declaration. */
2249 dwarf2_per_objfile::free_cached_comp_units ()
2251 dwarf2_per_cu_data *per_cu = read_in_chain;
2252 dwarf2_per_cu_data **last_chain = &read_in_chain;
2253 while (per_cu != NULL)
2255 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2257 free_heap_comp_unit (per_cu->cu);
2258 *last_chain = next_cu;
2263 /* Try to locate the sections we need for DWARF 2 debugging
2264 information and return true if we have enough to do something.
2265 NAMES points to the dwarf2 section names, or is NULL if the standard
2266 ELF names are used. */
2269 dwarf2_has_info (struct objfile *objfile,
2270 const struct dwarf2_debug_sections *names)
2272 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2273 objfile_data (objfile, dwarf2_objfile_data_key));
2274 if (!dwarf2_per_objfile)
2276 /* Initialize per-objfile state. */
2277 struct dwarf2_per_objfile *data
2278 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2280 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2281 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2283 return (!dwarf2_per_objfile->info.is_virtual
2284 && dwarf2_per_objfile->info.s.section != NULL
2285 && !dwarf2_per_objfile->abbrev.is_virtual
2286 && dwarf2_per_objfile->abbrev.s.section != NULL);
2289 /* Return the containing section of virtual section SECTION. */
2291 static struct dwarf2_section_info *
2292 get_containing_section (const struct dwarf2_section_info *section)
2294 gdb_assert (section->is_virtual);
2295 return section->s.containing_section;
2298 /* Return the bfd owner of SECTION. */
2301 get_section_bfd_owner (const struct dwarf2_section_info *section)
2303 if (section->is_virtual)
2305 section = get_containing_section (section);
2306 gdb_assert (!section->is_virtual);
2308 return section->s.section->owner;
2311 /* Return the bfd section of SECTION.
2312 Returns NULL if the section is not present. */
2315 get_section_bfd_section (const struct dwarf2_section_info *section)
2317 if (section->is_virtual)
2319 section = get_containing_section (section);
2320 gdb_assert (!section->is_virtual);
2322 return section->s.section;
2325 /* Return the name of SECTION. */
2328 get_section_name (const struct dwarf2_section_info *section)
2330 asection *sectp = get_section_bfd_section (section);
2332 gdb_assert (sectp != NULL);
2333 return bfd_section_name (get_section_bfd_owner (section), sectp);
2336 /* Return the name of the file SECTION is in. */
2339 get_section_file_name (const struct dwarf2_section_info *section)
2341 bfd *abfd = get_section_bfd_owner (section);
2343 return bfd_get_filename (abfd);
2346 /* Return the id of SECTION.
2347 Returns 0 if SECTION doesn't exist. */
2350 get_section_id (const struct dwarf2_section_info *section)
2352 asection *sectp = get_section_bfd_section (section);
2359 /* Return the flags of SECTION.
2360 SECTION (or containing section if this is a virtual section) must exist. */
2363 get_section_flags (const struct dwarf2_section_info *section)
2365 asection *sectp = get_section_bfd_section (section);
2367 gdb_assert (sectp != NULL);
2368 return bfd_get_section_flags (sectp->owner, sectp);
2371 /* When loading sections, we look either for uncompressed section or for
2372 compressed section names. */
2375 section_is_p (const char *section_name,
2376 const struct dwarf2_section_names *names)
2378 if (names->normal != NULL
2379 && strcmp (section_name, names->normal) == 0)
2381 if (names->compressed != NULL
2382 && strcmp (section_name, names->compressed) == 0)
2387 /* See declaration. */
2390 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2391 const dwarf2_debug_sections &names)
2393 flagword aflag = bfd_get_section_flags (abfd, sectp);
2395 if ((aflag & SEC_HAS_CONTENTS) == 0)
2398 else if (section_is_p (sectp->name, &names.info))
2400 this->info.s.section = sectp;
2401 this->info.size = bfd_get_section_size (sectp);
2403 else if (section_is_p (sectp->name, &names.abbrev))
2405 this->abbrev.s.section = sectp;
2406 this->abbrev.size = bfd_get_section_size (sectp);
2408 else if (section_is_p (sectp->name, &names.line))
2410 this->line.s.section = sectp;
2411 this->line.size = bfd_get_section_size (sectp);
2413 else if (section_is_p (sectp->name, &names.loc))
2415 this->loc.s.section = sectp;
2416 this->loc.size = bfd_get_section_size (sectp);
2418 else if (section_is_p (sectp->name, &names.loclists))
2420 this->loclists.s.section = sectp;
2421 this->loclists.size = bfd_get_section_size (sectp);
2423 else if (section_is_p (sectp->name, &names.macinfo))
2425 this->macinfo.s.section = sectp;
2426 this->macinfo.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.macro))
2430 this->macro.s.section = sectp;
2431 this->macro.size = bfd_get_section_size (sectp);
2433 else if (section_is_p (sectp->name, &names.str))
2435 this->str.s.section = sectp;
2436 this->str.size = bfd_get_section_size (sectp);
2438 else if (section_is_p (sectp->name, &names.line_str))
2440 this->line_str.s.section = sectp;
2441 this->line_str.size = bfd_get_section_size (sectp);
2443 else if (section_is_p (sectp->name, &names.addr))
2445 this->addr.s.section = sectp;
2446 this->addr.size = bfd_get_section_size (sectp);
2448 else if (section_is_p (sectp->name, &names.frame))
2450 this->frame.s.section = sectp;
2451 this->frame.size = bfd_get_section_size (sectp);
2453 else if (section_is_p (sectp->name, &names.eh_frame))
2455 this->eh_frame.s.section = sectp;
2456 this->eh_frame.size = bfd_get_section_size (sectp);
2458 else if (section_is_p (sectp->name, &names.ranges))
2460 this->ranges.s.section = sectp;
2461 this->ranges.size = bfd_get_section_size (sectp);
2463 else if (section_is_p (sectp->name, &names.rnglists))
2465 this->rnglists.s.section = sectp;
2466 this->rnglists.size = bfd_get_section_size (sectp);
2468 else if (section_is_p (sectp->name, &names.types))
2470 struct dwarf2_section_info type_section;
2472 memset (&type_section, 0, sizeof (type_section));
2473 type_section.s.section = sectp;
2474 type_section.size = bfd_get_section_size (sectp);
2476 VEC_safe_push (dwarf2_section_info_def, this->types,
2479 else if (section_is_p (sectp->name, &names.gdb_index))
2481 this->gdb_index.s.section = sectp;
2482 this->gdb_index.size = bfd_get_section_size (sectp);
2485 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2486 && bfd_section_vma (abfd, sectp) == 0)
2487 this->has_section_at_zero = true;
2490 /* A helper function that decides whether a section is empty,
2494 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2496 if (section->is_virtual)
2497 return section->size == 0;
2498 return section->s.section == NULL || section->size == 0;
2501 /* Read the contents of the section INFO.
2502 OBJFILE is the main object file, but not necessarily the file where
2503 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2505 If the section is compressed, uncompress it before returning. */
2508 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2512 gdb_byte *buf, *retbuf;
2516 info->buffer = NULL;
2519 if (dwarf2_section_empty_p (info))
2522 sectp = get_section_bfd_section (info);
2524 /* If this is a virtual section we need to read in the real one first. */
2525 if (info->is_virtual)
2527 struct dwarf2_section_info *containing_section =
2528 get_containing_section (info);
2530 gdb_assert (sectp != NULL);
2531 if ((sectp->flags & SEC_RELOC) != 0)
2533 error (_("Dwarf Error: DWP format V2 with relocations is not"
2534 " supported in section %s [in module %s]"),
2535 get_section_name (info), get_section_file_name (info));
2537 dwarf2_read_section (objfile, containing_section);
2538 /* Other code should have already caught virtual sections that don't
2540 gdb_assert (info->virtual_offset + info->size
2541 <= containing_section->size);
2542 /* If the real section is empty or there was a problem reading the
2543 section we shouldn't get here. */
2544 gdb_assert (containing_section->buffer != NULL);
2545 info->buffer = containing_section->buffer + info->virtual_offset;
2549 /* If the section has relocations, we must read it ourselves.
2550 Otherwise we attach it to the BFD. */
2551 if ((sectp->flags & SEC_RELOC) == 0)
2553 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2557 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2560 /* When debugging .o files, we may need to apply relocations; see
2561 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2562 We never compress sections in .o files, so we only need to
2563 try this when the section is not compressed. */
2564 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2567 info->buffer = retbuf;
2571 abfd = get_section_bfd_owner (info);
2572 gdb_assert (abfd != NULL);
2574 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2575 || bfd_bread (buf, info->size, abfd) != info->size)
2577 error (_("Dwarf Error: Can't read DWARF data"
2578 " in section %s [in module %s]"),
2579 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2583 /* A helper function that returns the size of a section in a safe way.
2584 If you are positive that the section has been read before using the
2585 size, then it is safe to refer to the dwarf2_section_info object's
2586 "size" field directly. In other cases, you must call this
2587 function, because for compressed sections the size field is not set
2588 correctly until the section has been read. */
2590 static bfd_size_type
2591 dwarf2_section_size (struct objfile *objfile,
2592 struct dwarf2_section_info *info)
2595 dwarf2_read_section (objfile, info);
2599 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2603 dwarf2_get_section_info (struct objfile *objfile,
2604 enum dwarf2_section_enum sect,
2605 asection **sectp, const gdb_byte **bufp,
2606 bfd_size_type *sizep)
2608 struct dwarf2_per_objfile *data
2609 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2610 dwarf2_objfile_data_key);
2611 struct dwarf2_section_info *info;
2613 /* We may see an objfile without any DWARF, in which case we just
2624 case DWARF2_DEBUG_FRAME:
2625 info = &data->frame;
2627 case DWARF2_EH_FRAME:
2628 info = &data->eh_frame;
2631 gdb_assert_not_reached ("unexpected section");
2634 dwarf2_read_section (objfile, info);
2636 *sectp = get_section_bfd_section (info);
2637 *bufp = info->buffer;
2638 *sizep = info->size;
2641 /* A helper function to find the sections for a .dwz file. */
2644 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2646 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2648 /* Note that we only support the standard ELF names, because .dwz
2649 is ELF-only (at the time of writing). */
2650 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2652 dwz_file->abbrev.s.section = sectp;
2653 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2655 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2657 dwz_file->info.s.section = sectp;
2658 dwz_file->info.size = bfd_get_section_size (sectp);
2660 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2662 dwz_file->str.s.section = sectp;
2663 dwz_file->str.size = bfd_get_section_size (sectp);
2665 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2667 dwz_file->line.s.section = sectp;
2668 dwz_file->line.size = bfd_get_section_size (sectp);
2670 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2672 dwz_file->macro.s.section = sectp;
2673 dwz_file->macro.size = bfd_get_section_size (sectp);
2675 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2677 dwz_file->gdb_index.s.section = sectp;
2678 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2682 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2683 there is no .gnu_debugaltlink section in the file. Error if there
2684 is such a section but the file cannot be found. */
2686 static struct dwz_file *
2687 dwarf2_get_dwz_file (void)
2690 struct cleanup *cleanup;
2691 const char *filename;
2692 struct dwz_file *result;
2693 bfd_size_type buildid_len_arg;
2697 if (dwarf2_per_objfile->dwz_file != NULL)
2698 return dwarf2_per_objfile->dwz_file;
2700 bfd_set_error (bfd_error_no_error);
2701 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2702 &buildid_len_arg, &buildid);
2705 if (bfd_get_error () == bfd_error_no_error)
2707 error (_("could not read '.gnu_debugaltlink' section: %s"),
2708 bfd_errmsg (bfd_get_error ()));
2710 cleanup = make_cleanup (xfree, data);
2711 make_cleanup (xfree, buildid);
2713 buildid_len = (size_t) buildid_len_arg;
2715 filename = (const char *) data;
2717 std::string abs_storage;
2718 if (!IS_ABSOLUTE_PATH (filename))
2720 gdb::unique_xmalloc_ptr<char> abs
2721 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2723 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2724 filename = abs_storage.c_str ();
2727 /* First try the file name given in the section. If that doesn't
2728 work, try to use the build-id instead. */
2729 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2730 if (dwz_bfd != NULL)
2732 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2736 if (dwz_bfd == NULL)
2737 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2739 if (dwz_bfd == NULL)
2740 error (_("could not find '.gnu_debugaltlink' file for %s"),
2741 objfile_name (dwarf2_per_objfile->objfile));
2743 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2745 result->dwz_bfd = dwz_bfd.release ();
2747 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2749 do_cleanups (cleanup);
2751 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2752 dwarf2_per_objfile->dwz_file = result;
2756 /* DWARF quick_symbols_functions support. */
2758 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2759 unique line tables, so we maintain a separate table of all .debug_line
2760 derived entries to support the sharing.
2761 All the quick functions need is the list of file names. We discard the
2762 line_header when we're done and don't need to record it here. */
2763 struct quick_file_names
2765 /* The data used to construct the hash key. */
2766 struct stmt_list_hash hash;
2768 /* The number of entries in file_names, real_names. */
2769 unsigned int num_file_names;
2771 /* The file names from the line table, after being run through
2773 const char **file_names;
2775 /* The file names from the line table after being run through
2776 gdb_realpath. These are computed lazily. */
2777 const char **real_names;
2780 /* When using the index (and thus not using psymtabs), each CU has an
2781 object of this type. This is used to hold information needed by
2782 the various "quick" methods. */
2783 struct dwarf2_per_cu_quick_data
2785 /* The file table. This can be NULL if there was no file table
2786 or it's currently not read in.
2787 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2788 struct quick_file_names *file_names;
2790 /* The corresponding symbol table. This is NULL if symbols for this
2791 CU have not yet been read. */
2792 struct compunit_symtab *compunit_symtab;
2794 /* A temporary mark bit used when iterating over all CUs in
2795 expand_symtabs_matching. */
2796 unsigned int mark : 1;
2798 /* True if we've tried to read the file table and found there isn't one.
2799 There will be no point in trying to read it again next time. */
2800 unsigned int no_file_data : 1;
2803 /* Utility hash function for a stmt_list_hash. */
2806 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2810 if (stmt_list_hash->dwo_unit != NULL)
2811 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2812 v += to_underlying (stmt_list_hash->line_sect_off);
2816 /* Utility equality function for a stmt_list_hash. */
2819 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2820 const struct stmt_list_hash *rhs)
2822 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2824 if (lhs->dwo_unit != NULL
2825 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2828 return lhs->line_sect_off == rhs->line_sect_off;
2831 /* Hash function for a quick_file_names. */
2834 hash_file_name_entry (const void *e)
2836 const struct quick_file_names *file_data
2837 = (const struct quick_file_names *) e;
2839 return hash_stmt_list_entry (&file_data->hash);
2842 /* Equality function for a quick_file_names. */
2845 eq_file_name_entry (const void *a, const void *b)
2847 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2848 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2850 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2853 /* Delete function for a quick_file_names. */
2856 delete_file_name_entry (void *e)
2858 struct quick_file_names *file_data = (struct quick_file_names *) e;
2861 for (i = 0; i < file_data->num_file_names; ++i)
2863 xfree ((void*) file_data->file_names[i]);
2864 if (file_data->real_names)
2865 xfree ((void*) file_data->real_names[i]);
2868 /* The space for the struct itself lives on objfile_obstack,
2869 so we don't free it here. */
2872 /* Create a quick_file_names hash table. */
2875 create_quick_file_names_table (unsigned int nr_initial_entries)
2877 return htab_create_alloc (nr_initial_entries,
2878 hash_file_name_entry, eq_file_name_entry,
2879 delete_file_name_entry, xcalloc, xfree);
2882 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2883 have to be created afterwards. You should call age_cached_comp_units after
2884 processing PER_CU->CU. dw2_setup must have been already called. */
2887 load_cu (struct dwarf2_per_cu_data *per_cu)
2889 if (per_cu->is_debug_types)
2890 load_full_type_unit (per_cu);
2892 load_full_comp_unit (per_cu, language_minimal);
2894 if (per_cu->cu == NULL)
2895 return; /* Dummy CU. */
2897 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2900 /* Read in the symbols for PER_CU. */
2903 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2905 struct cleanup *back_to;
2907 /* Skip type_unit_groups, reading the type units they contain
2908 is handled elsewhere. */
2909 if (IS_TYPE_UNIT_GROUP (per_cu))
2912 back_to = make_cleanup (dwarf2_release_queue, NULL);
2914 if (dwarf2_per_objfile->using_index
2915 ? per_cu->v.quick->compunit_symtab == NULL
2916 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2918 queue_comp_unit (per_cu, language_minimal);
2921 /* If we just loaded a CU from a DWO, and we're working with an index
2922 that may badly handle TUs, load all the TUs in that DWO as well.
2923 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2924 if (!per_cu->is_debug_types
2925 && per_cu->cu != NULL
2926 && per_cu->cu->dwo_unit != NULL
2927 && dwarf2_per_objfile->index_table != NULL
2928 && dwarf2_per_objfile->index_table->version <= 7
2929 /* DWP files aren't supported yet. */
2930 && get_dwp_file () == NULL)
2931 queue_and_load_all_dwo_tus (per_cu);
2936 /* Age the cache, releasing compilation units that have not
2937 been used recently. */
2938 age_cached_comp_units ();
2940 do_cleanups (back_to);
2943 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2944 the objfile from which this CU came. Returns the resulting symbol
2947 static struct compunit_symtab *
2948 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2950 gdb_assert (dwarf2_per_objfile->using_index);
2951 if (!per_cu->v.quick->compunit_symtab)
2953 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2954 scoped_restore decrementer = increment_reading_symtab ();
2955 dw2_do_instantiate_symtab (per_cu);
2956 process_cu_includes ();
2957 do_cleanups (back_to);
2960 return per_cu->v.quick->compunit_symtab;
2963 /* Return the CU/TU given its index.
2965 This is intended for loops like:
2967 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2968 + dwarf2_per_objfile->n_type_units); ++i)
2970 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2976 static struct dwarf2_per_cu_data *
2977 dw2_get_cutu (int index)
2979 if (index >= dwarf2_per_objfile->n_comp_units)
2981 index -= dwarf2_per_objfile->n_comp_units;
2982 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2983 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2986 return dwarf2_per_objfile->all_comp_units[index];
2989 /* Return the CU given its index.
2990 This differs from dw2_get_cutu in that it's for when you know INDEX
2993 static struct dwarf2_per_cu_data *
2994 dw2_get_cu (int index)
2996 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
2998 return dwarf2_per_objfile->all_comp_units[index];
3001 /* A helper for create_cus_from_index that handles a given list of
3005 create_cus_from_index_list (struct objfile *objfile,
3006 const gdb_byte *cu_list, offset_type n_elements,
3007 struct dwarf2_section_info *section,
3013 for (i = 0; i < n_elements; i += 2)
3015 gdb_static_assert (sizeof (ULONGEST) >= 8);
3017 sect_offset sect_off
3018 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3019 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3022 dwarf2_per_cu_data *the_cu
3023 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3024 struct dwarf2_per_cu_data);
3025 the_cu->sect_off = sect_off;
3026 the_cu->length = length;
3027 the_cu->objfile = objfile;
3028 the_cu->section = section;
3029 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3030 struct dwarf2_per_cu_quick_data);
3031 the_cu->is_dwz = is_dwz;
3032 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
3036 /* Read the CU list from the mapped index, and use it to create all
3037 the CU objects for this objfile. */
3040 create_cus_from_index (struct objfile *objfile,
3041 const gdb_byte *cu_list, offset_type cu_list_elements,
3042 const gdb_byte *dwz_list, offset_type dwz_elements)
3044 struct dwz_file *dwz;
3046 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3047 dwarf2_per_objfile->all_comp_units =
3048 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3049 dwarf2_per_objfile->n_comp_units);
3051 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3052 &dwarf2_per_objfile->info, 0, 0);
3054 if (dwz_elements == 0)
3057 dwz = dwarf2_get_dwz_file ();
3058 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3059 cu_list_elements / 2);
3062 /* Create the signatured type hash table from the index. */
3065 create_signatured_type_table_from_index (struct objfile *objfile,
3066 struct dwarf2_section_info *section,
3067 const gdb_byte *bytes,
3068 offset_type elements)
3071 htab_t sig_types_hash;
3073 dwarf2_per_objfile->n_type_units
3074 = dwarf2_per_objfile->n_allocated_type_units
3076 dwarf2_per_objfile->all_type_units =
3077 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3079 sig_types_hash = allocate_signatured_type_table (objfile);
3081 for (i = 0; i < elements; i += 3)
3083 struct signatured_type *sig_type;
3086 cu_offset type_offset_in_tu;
3088 gdb_static_assert (sizeof (ULONGEST) >= 8);
3089 sect_offset sect_off
3090 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3092 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3094 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3097 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3098 struct signatured_type);
3099 sig_type->signature = signature;
3100 sig_type->type_offset_in_tu = type_offset_in_tu;
3101 sig_type->per_cu.is_debug_types = 1;
3102 sig_type->per_cu.section = section;
3103 sig_type->per_cu.sect_off = sect_off;
3104 sig_type->per_cu.objfile = objfile;
3105 sig_type->per_cu.v.quick
3106 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3107 struct dwarf2_per_cu_quick_data);
3109 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3112 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3115 dwarf2_per_objfile->signatured_types = sig_types_hash;
3118 /* Read the address map data from the mapped index, and use it to
3119 populate the objfile's psymtabs_addrmap. */
3122 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3124 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3125 const gdb_byte *iter, *end;
3126 struct addrmap *mutable_map;
3129 auto_obstack temp_obstack;
3131 mutable_map = addrmap_create_mutable (&temp_obstack);
3133 iter = index->address_table;
3134 end = iter + index->address_table_size;
3136 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3140 ULONGEST hi, lo, cu_index;
3141 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3143 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3145 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3150 complaint (&symfile_complaints,
3151 _(".gdb_index address table has invalid range (%s - %s)"),
3152 hex_string (lo), hex_string (hi));
3156 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3158 complaint (&symfile_complaints,
3159 _(".gdb_index address table has invalid CU number %u"),
3160 (unsigned) cu_index);
3164 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3165 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3166 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3169 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3170 &objfile->objfile_obstack);
3173 /* The hash function for strings in the mapped index. This is the same as
3174 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3175 implementation. This is necessary because the hash function is tied to the
3176 format of the mapped index file. The hash values do not have to match with
3179 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3182 mapped_index_string_hash (int index_version, const void *p)
3184 const unsigned char *str = (const unsigned char *) p;
3188 while ((c = *str++) != 0)
3190 if (index_version >= 5)
3192 r = r * 67 + c - 113;
3198 /* Find a slot in the mapped index INDEX for the object named NAME.
3199 If NAME is found, set *VEC_OUT to point to the CU vector in the
3200 constant pool and return 1. If NAME cannot be found, return 0. */
3203 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3204 offset_type **vec_out)
3206 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
3208 offset_type slot, step;
3209 int (*cmp) (const char *, const char *);
3211 if (current_language->la_language == language_cplus
3212 || current_language->la_language == language_fortran
3213 || current_language->la_language == language_d)
3215 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3218 if (strchr (name, '(') != NULL)
3220 char *without_params = cp_remove_params (name);
3222 if (without_params != NULL)
3224 make_cleanup (xfree, without_params);
3225 name = without_params;
3230 /* Index version 4 did not support case insensitive searches. But the
3231 indices for case insensitive languages are built in lowercase, therefore
3232 simulate our NAME being searched is also lowercased. */
3233 hash = mapped_index_string_hash ((index->version == 4
3234 && case_sensitivity == case_sensitive_off
3235 ? 5 : index->version),
3238 slot = hash & (index->symbol_table_slots - 1);
3239 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3240 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3244 /* Convert a slot number to an offset into the table. */
3245 offset_type i = 2 * slot;
3247 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3249 do_cleanups (back_to);
3253 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3254 if (!cmp (name, str))
3256 *vec_out = (offset_type *) (index->constant_pool
3257 + MAYBE_SWAP (index->symbol_table[i + 1]));
3258 do_cleanups (back_to);
3262 slot = (slot + step) & (index->symbol_table_slots - 1);
3266 /* A helper function that reads the .gdb_index from SECTION and fills
3267 in MAP. FILENAME is the name of the file containing the section;
3268 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3269 ok to use deprecated sections.
3271 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3272 out parameters that are filled in with information about the CU and
3273 TU lists in the section.
3275 Returns 1 if all went well, 0 otherwise. */
3278 read_index_from_section (struct objfile *objfile,
3279 const char *filename,
3281 struct dwarf2_section_info *section,
3282 struct mapped_index *map,
3283 const gdb_byte **cu_list,
3284 offset_type *cu_list_elements,
3285 const gdb_byte **types_list,
3286 offset_type *types_list_elements)
3288 const gdb_byte *addr;
3289 offset_type version;
3290 offset_type *metadata;
3293 if (dwarf2_section_empty_p (section))
3296 /* Older elfutils strip versions could keep the section in the main
3297 executable while splitting it for the separate debug info file. */
3298 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3301 dwarf2_read_section (objfile, section);
3303 addr = section->buffer;
3304 /* Version check. */
3305 version = MAYBE_SWAP (*(offset_type *) addr);
3306 /* Versions earlier than 3 emitted every copy of a psymbol. This
3307 causes the index to behave very poorly for certain requests. Version 3
3308 contained incomplete addrmap. So, it seems better to just ignore such
3312 static int warning_printed = 0;
3313 if (!warning_printed)
3315 warning (_("Skipping obsolete .gdb_index section in %s."),
3317 warning_printed = 1;
3321 /* Index version 4 uses a different hash function than index version
3324 Versions earlier than 6 did not emit psymbols for inlined
3325 functions. Using these files will cause GDB not to be able to
3326 set breakpoints on inlined functions by name, so we ignore these
3327 indices unless the user has done
3328 "set use-deprecated-index-sections on". */
3329 if (version < 6 && !deprecated_ok)
3331 static int warning_printed = 0;
3332 if (!warning_printed)
3335 Skipping deprecated .gdb_index section in %s.\n\
3336 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3337 to use the section anyway."),
3339 warning_printed = 1;
3343 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3344 of the TU (for symbols coming from TUs),
3345 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3346 Plus gold-generated indices can have duplicate entries for global symbols,
3347 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3348 These are just performance bugs, and we can't distinguish gdb-generated
3349 indices from gold-generated ones, so issue no warning here. */
3351 /* Indexes with higher version than the one supported by GDB may be no
3352 longer backward compatible. */
3356 map->version = version;
3357 map->total_size = section->size;
3359 metadata = (offset_type *) (addr + sizeof (offset_type));
3362 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3363 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3367 *types_list = addr + MAYBE_SWAP (metadata[i]);
3368 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3369 - MAYBE_SWAP (metadata[i]))
3373 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3374 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3375 - MAYBE_SWAP (metadata[i]));
3378 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3379 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3380 - MAYBE_SWAP (metadata[i]))
3381 / (2 * sizeof (offset_type)));
3384 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3390 /* Read the index file. If everything went ok, initialize the "quick"
3391 elements of all the CUs and return 1. Otherwise, return 0. */
3394 dwarf2_read_index (struct objfile *objfile)
3396 struct mapped_index local_map, *map;
3397 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3398 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3399 struct dwz_file *dwz;
3401 if (!read_index_from_section (objfile, objfile_name (objfile),
3402 use_deprecated_index_sections,
3403 &dwarf2_per_objfile->gdb_index, &local_map,
3404 &cu_list, &cu_list_elements,
3405 &types_list, &types_list_elements))
3408 /* Don't use the index if it's empty. */
3409 if (local_map.symbol_table_slots == 0)
3412 /* If there is a .dwz file, read it so we can get its CU list as
3414 dwz = dwarf2_get_dwz_file ();
3417 struct mapped_index dwz_map;
3418 const gdb_byte *dwz_types_ignore;
3419 offset_type dwz_types_elements_ignore;
3421 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3423 &dwz->gdb_index, &dwz_map,
3424 &dwz_list, &dwz_list_elements,
3426 &dwz_types_elements_ignore))
3428 warning (_("could not read '.gdb_index' section from %s; skipping"),
3429 bfd_get_filename (dwz->dwz_bfd));
3434 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3437 if (types_list_elements)
3439 struct dwarf2_section_info *section;
3441 /* We can only handle a single .debug_types when we have an
3443 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3446 section = VEC_index (dwarf2_section_info_def,
3447 dwarf2_per_objfile->types, 0);
3449 create_signatured_type_table_from_index (objfile, section, types_list,
3450 types_list_elements);
3453 create_addrmap_from_index (objfile, &local_map);
3455 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3458 dwarf2_per_objfile->index_table = map;
3459 dwarf2_per_objfile->using_index = 1;
3460 dwarf2_per_objfile->quick_file_names_table =
3461 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3466 /* A helper for the "quick" functions which sets the global
3467 dwarf2_per_objfile according to OBJFILE. */
3470 dw2_setup (struct objfile *objfile)
3472 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3473 objfile_data (objfile, dwarf2_objfile_data_key));
3474 gdb_assert (dwarf2_per_objfile);
3477 /* die_reader_func for dw2_get_file_names. */
3480 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3481 const gdb_byte *info_ptr,
3482 struct die_info *comp_unit_die,
3486 struct dwarf2_cu *cu = reader->cu;
3487 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3488 struct objfile *objfile = dwarf2_per_objfile->objfile;
3489 struct dwarf2_per_cu_data *lh_cu;
3490 struct attribute *attr;
3493 struct quick_file_names *qfn;
3495 gdb_assert (! this_cu->is_debug_types);
3497 /* Our callers never want to match partial units -- instead they
3498 will match the enclosing full CU. */
3499 if (comp_unit_die->tag == DW_TAG_partial_unit)
3501 this_cu->v.quick->no_file_data = 1;
3509 sect_offset line_offset {};
3511 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3514 struct quick_file_names find_entry;
3516 line_offset = (sect_offset) DW_UNSND (attr);
3518 /* We may have already read in this line header (TU line header sharing).
3519 If we have we're done. */
3520 find_entry.hash.dwo_unit = cu->dwo_unit;
3521 find_entry.hash.line_sect_off = line_offset;
3522 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3523 &find_entry, INSERT);
3526 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3530 lh = dwarf_decode_line_header (line_offset, cu);
3534 lh_cu->v.quick->no_file_data = 1;
3538 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3539 qfn->hash.dwo_unit = cu->dwo_unit;
3540 qfn->hash.line_sect_off = line_offset;
3541 gdb_assert (slot != NULL);
3544 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3546 qfn->num_file_names = lh->file_names.size ();
3548 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3549 for (i = 0; i < lh->file_names.size (); ++i)
3550 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3551 qfn->real_names = NULL;
3553 lh_cu->v.quick->file_names = qfn;
3556 /* A helper for the "quick" functions which attempts to read the line
3557 table for THIS_CU. */
3559 static struct quick_file_names *
3560 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3562 /* This should never be called for TUs. */
3563 gdb_assert (! this_cu->is_debug_types);
3564 /* Nor type unit groups. */
3565 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3567 if (this_cu->v.quick->file_names != NULL)
3568 return this_cu->v.quick->file_names;
3569 /* If we know there is no line data, no point in looking again. */
3570 if (this_cu->v.quick->no_file_data)
3573 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3575 if (this_cu->v.quick->no_file_data)
3577 return this_cu->v.quick->file_names;
3580 /* A helper for the "quick" functions which computes and caches the
3581 real path for a given file name from the line table. */
3584 dw2_get_real_path (struct objfile *objfile,
3585 struct quick_file_names *qfn, int index)
3587 if (qfn->real_names == NULL)
3588 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3589 qfn->num_file_names, const char *);
3591 if (qfn->real_names[index] == NULL)
3592 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3594 return qfn->real_names[index];
3597 static struct symtab *
3598 dw2_find_last_source_symtab (struct objfile *objfile)
3600 struct compunit_symtab *cust;
3603 dw2_setup (objfile);
3604 index = dwarf2_per_objfile->n_comp_units - 1;
3605 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3608 return compunit_primary_filetab (cust);
3611 /* Traversal function for dw2_forget_cached_source_info. */
3614 dw2_free_cached_file_names (void **slot, void *info)
3616 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3618 if (file_data->real_names)
3622 for (i = 0; i < file_data->num_file_names; ++i)
3624 xfree ((void*) file_data->real_names[i]);
3625 file_data->real_names[i] = NULL;
3633 dw2_forget_cached_source_info (struct objfile *objfile)
3635 dw2_setup (objfile);
3637 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3638 dw2_free_cached_file_names, NULL);
3641 /* Helper function for dw2_map_symtabs_matching_filename that expands
3642 the symtabs and calls the iterator. */
3645 dw2_map_expand_apply (struct objfile *objfile,
3646 struct dwarf2_per_cu_data *per_cu,
3647 const char *name, const char *real_path,
3648 gdb::function_view<bool (symtab *)> callback)
3650 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3652 /* Don't visit already-expanded CUs. */
3653 if (per_cu->v.quick->compunit_symtab)
3656 /* This may expand more than one symtab, and we want to iterate over
3658 dw2_instantiate_symtab (per_cu);
3660 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3661 last_made, callback);
3664 /* Implementation of the map_symtabs_matching_filename method. */
3667 dw2_map_symtabs_matching_filename
3668 (struct objfile *objfile, const char *name, const char *real_path,
3669 gdb::function_view<bool (symtab *)> callback)
3672 const char *name_basename = lbasename (name);
3674 dw2_setup (objfile);
3676 /* The rule is CUs specify all the files, including those used by
3677 any TU, so there's no need to scan TUs here. */
3679 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3682 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3683 struct quick_file_names *file_data;
3685 /* We only need to look at symtabs not already expanded. */
3686 if (per_cu->v.quick->compunit_symtab)
3689 file_data = dw2_get_file_names (per_cu);
3690 if (file_data == NULL)
3693 for (j = 0; j < file_data->num_file_names; ++j)
3695 const char *this_name = file_data->file_names[j];
3696 const char *this_real_name;
3698 if (compare_filenames_for_search (this_name, name))
3700 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3706 /* Before we invoke realpath, which can get expensive when many
3707 files are involved, do a quick comparison of the basenames. */
3708 if (! basenames_may_differ
3709 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3712 this_real_name = dw2_get_real_path (objfile, file_data, j);
3713 if (compare_filenames_for_search (this_real_name, name))
3715 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3721 if (real_path != NULL)
3723 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3724 gdb_assert (IS_ABSOLUTE_PATH (name));
3725 if (this_real_name != NULL
3726 && FILENAME_CMP (real_path, this_real_name) == 0)
3728 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3740 /* Struct used to manage iterating over all CUs looking for a symbol. */
3742 struct dw2_symtab_iterator
3744 /* The internalized form of .gdb_index. */
3745 struct mapped_index *index;
3746 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3747 int want_specific_block;
3748 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3749 Unused if !WANT_SPECIFIC_BLOCK. */
3751 /* The kind of symbol we're looking for. */
3753 /* The list of CUs from the index entry of the symbol,
3754 or NULL if not found. */
3756 /* The next element in VEC to look at. */
3758 /* The number of elements in VEC, or zero if there is no match. */
3760 /* Have we seen a global version of the symbol?
3761 If so we can ignore all further global instances.
3762 This is to work around gold/15646, inefficient gold-generated
3767 /* Initialize the index symtab iterator ITER.
3768 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3769 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3772 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3773 struct mapped_index *index,
3774 int want_specific_block,
3779 iter->index = index;
3780 iter->want_specific_block = want_specific_block;
3781 iter->block_index = block_index;
3782 iter->domain = domain;
3784 iter->global_seen = 0;
3786 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3787 iter->length = MAYBE_SWAP (*iter->vec);
3795 /* Return the next matching CU or NULL if there are no more. */
3797 static struct dwarf2_per_cu_data *
3798 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3800 for ( ; iter->next < iter->length; ++iter->next)
3802 offset_type cu_index_and_attrs =
3803 MAYBE_SWAP (iter->vec[iter->next + 1]);
3804 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3805 struct dwarf2_per_cu_data *per_cu;
3806 int want_static = iter->block_index != GLOBAL_BLOCK;
3807 /* This value is only valid for index versions >= 7. */
3808 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3809 gdb_index_symbol_kind symbol_kind =
3810 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3811 /* Only check the symbol attributes if they're present.
3812 Indices prior to version 7 don't record them,
3813 and indices >= 7 may elide them for certain symbols
3814 (gold does this). */
3816 (iter->index->version >= 7
3817 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3819 /* Don't crash on bad data. */
3820 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3821 + dwarf2_per_objfile->n_type_units))
3823 complaint (&symfile_complaints,
3824 _(".gdb_index entry has bad CU index"
3826 objfile_name (dwarf2_per_objfile->objfile));
3830 per_cu = dw2_get_cutu (cu_index);
3832 /* Skip if already read in. */
3833 if (per_cu->v.quick->compunit_symtab)
3836 /* Check static vs global. */
3839 if (iter->want_specific_block
3840 && want_static != is_static)
3842 /* Work around gold/15646. */
3843 if (!is_static && iter->global_seen)
3846 iter->global_seen = 1;
3849 /* Only check the symbol's kind if it has one. */
3852 switch (iter->domain)
3855 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3856 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3857 /* Some types are also in VAR_DOMAIN. */
3858 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3862 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3866 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3881 static struct compunit_symtab *
3882 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3883 const char *name, domain_enum domain)
3885 struct compunit_symtab *stab_best = NULL;
3886 struct mapped_index *index;
3888 dw2_setup (objfile);
3890 index = dwarf2_per_objfile->index_table;
3892 /* index is NULL if OBJF_READNOW. */
3895 struct dw2_symtab_iterator iter;
3896 struct dwarf2_per_cu_data *per_cu;
3898 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3900 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3902 struct symbol *sym, *with_opaque = NULL;
3903 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3904 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3905 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3907 sym = block_find_symbol (block, name, domain,
3908 block_find_non_opaque_type_preferred,
3911 /* Some caution must be observed with overloaded functions
3912 and methods, since the index will not contain any overload
3913 information (but NAME might contain it). */
3916 && SYMBOL_MATCHES_SEARCH_NAME (sym, name))
3918 if (with_opaque != NULL
3919 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, name))
3922 /* Keep looking through other CUs. */
3930 dw2_print_stats (struct objfile *objfile)
3932 int i, total, count;
3934 dw2_setup (objfile);
3935 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3937 for (i = 0; i < total; ++i)
3939 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3941 if (!per_cu->v.quick->compunit_symtab)
3944 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3945 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3948 /* This dumps minimal information about the index.
3949 It is called via "mt print objfiles".
3950 One use is to verify .gdb_index has been loaded by the
3951 gdb.dwarf2/gdb-index.exp testcase. */
3954 dw2_dump (struct objfile *objfile)
3956 dw2_setup (objfile);
3957 gdb_assert (dwarf2_per_objfile->using_index);
3958 printf_filtered (".gdb_index:");
3959 if (dwarf2_per_objfile->index_table != NULL)
3961 printf_filtered (" version %d\n",
3962 dwarf2_per_objfile->index_table->version);
3965 printf_filtered (" faked for \"readnow\"\n");
3966 printf_filtered ("\n");
3970 dw2_relocate (struct objfile *objfile,
3971 const struct section_offsets *new_offsets,
3972 const struct section_offsets *delta)
3974 /* There's nothing to relocate here. */
3978 dw2_expand_symtabs_for_function (struct objfile *objfile,
3979 const char *func_name)
3981 struct mapped_index *index;
3983 dw2_setup (objfile);
3985 index = dwarf2_per_objfile->index_table;
3987 /* index is NULL if OBJF_READNOW. */
3990 struct dw2_symtab_iterator iter;
3991 struct dwarf2_per_cu_data *per_cu;
3993 /* Note: It doesn't matter what we pass for block_index here. */
3994 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3997 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3998 dw2_instantiate_symtab (per_cu);
4003 dw2_expand_all_symtabs (struct objfile *objfile)
4007 dw2_setup (objfile);
4009 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4010 + dwarf2_per_objfile->n_type_units); ++i)
4012 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4014 dw2_instantiate_symtab (per_cu);
4019 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4020 const char *fullname)
4024 dw2_setup (objfile);
4026 /* We don't need to consider type units here.
4027 This is only called for examining code, e.g. expand_line_sal.
4028 There can be an order of magnitude (or more) more type units
4029 than comp units, and we avoid them if we can. */
4031 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4034 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4035 struct quick_file_names *file_data;
4037 /* We only need to look at symtabs not already expanded. */
4038 if (per_cu->v.quick->compunit_symtab)
4041 file_data = dw2_get_file_names (per_cu);
4042 if (file_data == NULL)
4045 for (j = 0; j < file_data->num_file_names; ++j)
4047 const char *this_fullname = file_data->file_names[j];
4049 if (filename_cmp (this_fullname, fullname) == 0)
4051 dw2_instantiate_symtab (per_cu);
4059 dw2_map_matching_symbols (struct objfile *objfile,
4060 const char * name, domain_enum domain,
4062 int (*callback) (struct block *,
4063 struct symbol *, void *),
4064 void *data, symbol_compare_ftype *match,
4065 symbol_compare_ftype *ordered_compare)
4067 /* Currently unimplemented; used for Ada. The function can be called if the
4068 current language is Ada for a non-Ada objfile using GNU index. As Ada
4069 does not look for non-Ada symbols this function should just return. */
4073 dw2_expand_symtabs_matching
4074 (struct objfile *objfile,
4075 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4076 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4077 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4078 enum search_domain kind)
4082 struct mapped_index *index;
4084 dw2_setup (objfile);
4086 /* index_table is NULL if OBJF_READNOW. */
4087 if (!dwarf2_per_objfile->index_table)
4089 index = dwarf2_per_objfile->index_table;
4091 if (file_matcher != NULL)
4093 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
4095 NULL, xcalloc, xfree));
4096 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
4098 NULL, xcalloc, xfree));
4100 /* The rule is CUs specify all the files, including those used by
4101 any TU, so there's no need to scan TUs here. */
4103 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4106 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4107 struct quick_file_names *file_data;
4112 per_cu->v.quick->mark = 0;
4114 /* We only need to look at symtabs not already expanded. */
4115 if (per_cu->v.quick->compunit_symtab)
4118 file_data = dw2_get_file_names (per_cu);
4119 if (file_data == NULL)
4122 if (htab_find (visited_not_found.get (), file_data) != NULL)
4124 else if (htab_find (visited_found.get (), file_data) != NULL)
4126 per_cu->v.quick->mark = 1;
4130 for (j = 0; j < file_data->num_file_names; ++j)
4132 const char *this_real_name;
4134 if (file_matcher (file_data->file_names[j], false))
4136 per_cu->v.quick->mark = 1;
4140 /* Before we invoke realpath, which can get expensive when many
4141 files are involved, do a quick comparison of the basenames. */
4142 if (!basenames_may_differ
4143 && !file_matcher (lbasename (file_data->file_names[j]),
4147 this_real_name = dw2_get_real_path (objfile, file_data, j);
4148 if (file_matcher (this_real_name, false))
4150 per_cu->v.quick->mark = 1;
4155 slot = htab_find_slot (per_cu->v.quick->mark
4156 ? visited_found.get ()
4157 : visited_not_found.get (),
4163 for (iter = 0; iter < index->symbol_table_slots; ++iter)
4165 offset_type idx = 2 * iter;
4167 offset_type *vec, vec_len, vec_idx;
4168 int global_seen = 0;
4172 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
4175 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
4177 if (!symbol_matcher (name))
4180 /* The name was matched, now expand corresponding CUs that were
4182 vec = (offset_type *) (index->constant_pool
4183 + MAYBE_SWAP (index->symbol_table[idx + 1]));
4184 vec_len = MAYBE_SWAP (vec[0]);
4185 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4187 struct dwarf2_per_cu_data *per_cu;
4188 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4189 /* This value is only valid for index versions >= 7. */
4190 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4191 gdb_index_symbol_kind symbol_kind =
4192 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4193 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4194 /* Only check the symbol attributes if they're present.
4195 Indices prior to version 7 don't record them,
4196 and indices >= 7 may elide them for certain symbols
4197 (gold does this). */
4199 (index->version >= 7
4200 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4202 /* Work around gold/15646. */
4205 if (!is_static && global_seen)
4211 /* Only check the symbol's kind if it has one. */
4216 case VARIABLES_DOMAIN:
4217 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4220 case FUNCTIONS_DOMAIN:
4221 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4225 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4233 /* Don't crash on bad data. */
4234 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4235 + dwarf2_per_objfile->n_type_units))
4237 complaint (&symfile_complaints,
4238 _(".gdb_index entry has bad CU index"
4239 " [in module %s]"), objfile_name (objfile));
4243 per_cu = dw2_get_cutu (cu_index);
4244 if (file_matcher == NULL || per_cu->v.quick->mark)
4246 int symtab_was_null =
4247 (per_cu->v.quick->compunit_symtab == NULL);
4249 dw2_instantiate_symtab (per_cu);
4251 if (expansion_notify != NULL
4253 && per_cu->v.quick->compunit_symtab != NULL)
4255 expansion_notify (per_cu->v.quick->compunit_symtab);
4262 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4265 static struct compunit_symtab *
4266 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4271 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4272 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4275 if (cust->includes == NULL)
4278 for (i = 0; cust->includes[i]; ++i)
4280 struct compunit_symtab *s = cust->includes[i];
4282 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4290 static struct compunit_symtab *
4291 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4292 struct bound_minimal_symbol msymbol,
4294 struct obj_section *section,
4297 struct dwarf2_per_cu_data *data;
4298 struct compunit_symtab *result;
4300 dw2_setup (objfile);
4302 if (!objfile->psymtabs_addrmap)
4305 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4310 if (warn_if_readin && data->v.quick->compunit_symtab)
4311 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4312 paddress (get_objfile_arch (objfile), pc));
4315 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4317 gdb_assert (result != NULL);
4322 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4323 void *data, int need_fullname)
4325 dw2_setup (objfile);
4327 if (!dwarf2_per_objfile->filenames_cache)
4329 dwarf2_per_objfile->filenames_cache.emplace ();
4331 htab_up visited (htab_create_alloc (10,
4332 htab_hash_pointer, htab_eq_pointer,
4333 NULL, xcalloc, xfree));
4335 /* The rule is CUs specify all the files, including those used
4336 by any TU, so there's no need to scan TUs here. We can
4337 ignore file names coming from already-expanded CUs. */
4339 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4341 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4343 if (per_cu->v.quick->compunit_symtab)
4345 void **slot = htab_find_slot (visited.get (),
4346 per_cu->v.quick->file_names,
4349 *slot = per_cu->v.quick->file_names;
4353 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4356 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4357 struct quick_file_names *file_data;
4360 /* We only need to look at symtabs not already expanded. */
4361 if (per_cu->v.quick->compunit_symtab)
4364 file_data = dw2_get_file_names (per_cu);
4365 if (file_data == NULL)
4368 slot = htab_find_slot (visited.get (), file_data, INSERT);
4371 /* Already visited. */
4376 for (int j = 0; j < file_data->num_file_names; ++j)
4378 const char *filename = file_data->file_names[j];
4379 dwarf2_per_objfile->filenames_cache->seen (filename);
4384 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
4386 gdb::unique_xmalloc_ptr<char> this_real_name;
4389 this_real_name = gdb_realpath (filename);
4390 (*fun) (filename, this_real_name.get (), data);
4395 dw2_has_symbols (struct objfile *objfile)
4400 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4403 dw2_find_last_source_symtab,
4404 dw2_forget_cached_source_info,
4405 dw2_map_symtabs_matching_filename,
4410 dw2_expand_symtabs_for_function,
4411 dw2_expand_all_symtabs,
4412 dw2_expand_symtabs_with_fullname,
4413 dw2_map_matching_symbols,
4414 dw2_expand_symtabs_matching,
4415 dw2_find_pc_sect_compunit_symtab,
4416 dw2_map_symbol_filenames
4419 /* Initialize for reading DWARF for this objfile. Return 0 if this
4420 file will use psymtabs, or 1 if using the GNU index. */
4423 dwarf2_initialize_objfile (struct objfile *objfile)
4425 /* If we're about to read full symbols, don't bother with the
4426 indices. In this case we also don't care if some other debug
4427 format is making psymtabs, because they are all about to be
4429 if ((objfile->flags & OBJF_READNOW))
4433 dwarf2_per_objfile->using_index = 1;
4434 create_all_comp_units (objfile);
4435 create_all_type_units (objfile);
4436 dwarf2_per_objfile->quick_file_names_table =
4437 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4439 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4440 + dwarf2_per_objfile->n_type_units); ++i)
4442 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4444 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4445 struct dwarf2_per_cu_quick_data);
4448 /* Return 1 so that gdb sees the "quick" functions. However,
4449 these functions will be no-ops because we will have expanded
4454 if (dwarf2_read_index (objfile))
4462 /* Build a partial symbol table. */
4465 dwarf2_build_psymtabs (struct objfile *objfile)
4468 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4470 init_psymbol_list (objfile, 1024);
4475 /* This isn't really ideal: all the data we allocate on the
4476 objfile's obstack is still uselessly kept around. However,
4477 freeing it seems unsafe. */
4478 psymtab_discarder psymtabs (objfile);
4479 dwarf2_build_psymtabs_hard (objfile);
4482 CATCH (except, RETURN_MASK_ERROR)
4484 exception_print (gdb_stderr, except);
4489 /* Return the total length of the CU described by HEADER. */
4492 get_cu_length (const struct comp_unit_head *header)
4494 return header->initial_length_size + header->length;
4497 /* Return TRUE if SECT_OFF is within CU_HEADER. */
4500 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
4502 sect_offset bottom = cu_header->sect_off;
4503 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
4505 return sect_off >= bottom && sect_off < top;
4508 /* Find the base address of the compilation unit for range lists and
4509 location lists. It will normally be specified by DW_AT_low_pc.
4510 In DWARF-3 draft 4, the base address could be overridden by
4511 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4512 compilation units with discontinuous ranges. */
4515 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4517 struct attribute *attr;
4520 cu->base_address = 0;
4522 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4525 cu->base_address = attr_value_as_address (attr);
4530 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4533 cu->base_address = attr_value_as_address (attr);
4539 /* Read in the comp unit header information from the debug_info at info_ptr.
4540 Use rcuh_kind::COMPILE as the default type if not known by the caller.
4541 NOTE: This leaves members offset, first_die_offset to be filled in
4544 static const gdb_byte *
4545 read_comp_unit_head (struct comp_unit_head *cu_header,
4546 const gdb_byte *info_ptr,
4547 struct dwarf2_section_info *section,
4548 rcuh_kind section_kind)
4551 unsigned int bytes_read;
4552 const char *filename = get_section_file_name (section);
4553 bfd *abfd = get_section_bfd_owner (section);
4555 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4556 cu_header->initial_length_size = bytes_read;
4557 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4558 info_ptr += bytes_read;
4559 cu_header->version = read_2_bytes (abfd, info_ptr);
4561 if (cu_header->version < 5)
4562 switch (section_kind)
4564 case rcuh_kind::COMPILE:
4565 cu_header->unit_type = DW_UT_compile;
4567 case rcuh_kind::TYPE:
4568 cu_header->unit_type = DW_UT_type;
4571 internal_error (__FILE__, __LINE__,
4572 _("read_comp_unit_head: invalid section_kind"));
4576 cu_header->unit_type = static_cast<enum dwarf_unit_type>
4577 (read_1_byte (abfd, info_ptr));
4579 switch (cu_header->unit_type)
4582 if (section_kind != rcuh_kind::COMPILE)
4583 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4584 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
4588 section_kind = rcuh_kind::TYPE;
4591 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4592 "(is %d, should be %d or %d) [in module %s]"),
4593 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
4596 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4599 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
4602 info_ptr += bytes_read;
4603 if (cu_header->version < 5)
4605 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4608 signed_addr = bfd_get_sign_extend_vma (abfd);
4609 if (signed_addr < 0)
4610 internal_error (__FILE__, __LINE__,
4611 _("read_comp_unit_head: dwarf from non elf file"));
4612 cu_header->signed_addr_p = signed_addr;
4614 if (section_kind == rcuh_kind::TYPE)
4616 LONGEST type_offset;
4618 cu_header->signature = read_8_bytes (abfd, info_ptr);
4621 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
4622 info_ptr += bytes_read;
4623 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
4624 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
4625 error (_("Dwarf Error: Too big type_offset in compilation unit "
4626 "header (is %s) [in module %s]"), plongest (type_offset),
4633 /* Helper function that returns the proper abbrev section for
4636 static struct dwarf2_section_info *
4637 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4639 struct dwarf2_section_info *abbrev;
4641 if (this_cu->is_dwz)
4642 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4644 abbrev = &dwarf2_per_objfile->abbrev;
4649 /* Subroutine of read_and_check_comp_unit_head and
4650 read_and_check_type_unit_head to simplify them.
4651 Perform various error checking on the header. */
4654 error_check_comp_unit_head (struct comp_unit_head *header,
4655 struct dwarf2_section_info *section,
4656 struct dwarf2_section_info *abbrev_section)
4658 const char *filename = get_section_file_name (section);
4660 if (header->version < 2 || header->version > 5)
4661 error (_("Dwarf Error: wrong version in compilation unit header "
4662 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
4665 if (to_underlying (header->abbrev_sect_off)
4666 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4667 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
4668 "(offset 0x%x + 6) [in module %s]"),
4669 to_underlying (header->abbrev_sect_off),
4670 to_underlying (header->sect_off),
4673 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
4674 avoid potential 32-bit overflow. */
4675 if (((ULONGEST) header->sect_off + get_cu_length (header))
4677 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
4678 "(offset 0x%x + 0) [in module %s]"),
4679 header->length, to_underlying (header->sect_off),
4683 /* Read in a CU/TU header and perform some basic error checking.
4684 The contents of the header are stored in HEADER.
4685 The result is a pointer to the start of the first DIE. */
4687 static const gdb_byte *
4688 read_and_check_comp_unit_head (struct comp_unit_head *header,
4689 struct dwarf2_section_info *section,
4690 struct dwarf2_section_info *abbrev_section,
4691 const gdb_byte *info_ptr,
4692 rcuh_kind section_kind)
4694 const gdb_byte *beg_of_comp_unit = info_ptr;
4695 bfd *abfd = get_section_bfd_owner (section);
4697 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
4699 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
4701 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
4703 error_check_comp_unit_head (header, section, abbrev_section);
4708 /* Fetch the abbreviation table offset from a comp or type unit header. */
4711 read_abbrev_offset (struct dwarf2_section_info *section,
4712 sect_offset sect_off)
4714 bfd *abfd = get_section_bfd_owner (section);
4715 const gdb_byte *info_ptr;
4716 unsigned int initial_length_size, offset_size;
4719 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4720 info_ptr = section->buffer + to_underlying (sect_off);
4721 read_initial_length (abfd, info_ptr, &initial_length_size);
4722 offset_size = initial_length_size == 4 ? 4 : 8;
4723 info_ptr += initial_length_size;
4725 version = read_2_bytes (abfd, info_ptr);
4729 /* Skip unit type and address size. */
4733 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
4736 /* Allocate a new partial symtab for file named NAME and mark this new
4737 partial symtab as being an include of PST. */
4740 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4741 struct objfile *objfile)
4743 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4745 if (!IS_ABSOLUTE_PATH (subpst->filename))
4747 /* It shares objfile->objfile_obstack. */
4748 subpst->dirname = pst->dirname;
4751 subpst->textlow = 0;
4752 subpst->texthigh = 0;
4754 subpst->dependencies
4755 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
4756 subpst->dependencies[0] = pst;
4757 subpst->number_of_dependencies = 1;
4759 subpst->globals_offset = 0;
4760 subpst->n_global_syms = 0;
4761 subpst->statics_offset = 0;
4762 subpst->n_static_syms = 0;
4763 subpst->compunit_symtab = NULL;
4764 subpst->read_symtab = pst->read_symtab;
4767 /* No private part is necessary for include psymtabs. This property
4768 can be used to differentiate between such include psymtabs and
4769 the regular ones. */
4770 subpst->read_symtab_private = NULL;
4773 /* Read the Line Number Program data and extract the list of files
4774 included by the source file represented by PST. Build an include
4775 partial symtab for each of these included files. */
4778 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4779 struct die_info *die,
4780 struct partial_symtab *pst)
4783 struct attribute *attr;
4785 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4787 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
4789 return; /* No linetable, so no includes. */
4791 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4792 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
4796 hash_signatured_type (const void *item)
4798 const struct signatured_type *sig_type
4799 = (const struct signatured_type *) item;
4801 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4802 return sig_type->signature;
4806 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4808 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
4809 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
4811 return lhs->signature == rhs->signature;
4814 /* Allocate a hash table for signatured types. */
4817 allocate_signatured_type_table (struct objfile *objfile)
4819 return htab_create_alloc_ex (41,
4820 hash_signatured_type,
4823 &objfile->objfile_obstack,
4824 hashtab_obstack_allocate,
4825 dummy_obstack_deallocate);
4828 /* A helper function to add a signatured type CU to a table. */
4831 add_signatured_type_cu_to_table (void **slot, void *datum)
4833 struct signatured_type *sigt = (struct signatured_type *) *slot;
4834 struct signatured_type ***datap = (struct signatured_type ***) datum;
4842 /* A helper for create_debug_types_hash_table. Read types from SECTION
4843 and fill them into TYPES_HTAB. It will process only type units,
4844 therefore DW_UT_type. */
4847 create_debug_type_hash_table (struct dwo_file *dwo_file,
4848 dwarf2_section_info *section, htab_t &types_htab,
4849 rcuh_kind section_kind)
4851 struct objfile *objfile = dwarf2_per_objfile->objfile;
4852 struct dwarf2_section_info *abbrev_section;
4854 const gdb_byte *info_ptr, *end_ptr;
4856 abbrev_section = (dwo_file != NULL
4857 ? &dwo_file->sections.abbrev
4858 : &dwarf2_per_objfile->abbrev);
4860 if (dwarf_read_debug)
4861 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
4862 get_section_name (section),
4863 get_section_file_name (abbrev_section));
4865 dwarf2_read_section (objfile, section);
4866 info_ptr = section->buffer;
4868 if (info_ptr == NULL)
4871 /* We can't set abfd until now because the section may be empty or
4872 not present, in which case the bfd is unknown. */
4873 abfd = get_section_bfd_owner (section);
4875 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4876 because we don't need to read any dies: the signature is in the
4879 end_ptr = info_ptr + section->size;
4880 while (info_ptr < end_ptr)
4882 struct signatured_type *sig_type;
4883 struct dwo_unit *dwo_tu;
4885 const gdb_byte *ptr = info_ptr;
4886 struct comp_unit_head header;
4887 unsigned int length;
4889 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
4891 /* Initialize it due to a false compiler warning. */
4892 header.signature = -1;
4893 header.type_cu_offset_in_tu = (cu_offset) -1;
4895 /* We need to read the type's signature in order to build the hash
4896 table, but we don't need anything else just yet. */
4898 ptr = read_and_check_comp_unit_head (&header, section,
4899 abbrev_section, ptr, section_kind);
4901 length = get_cu_length (&header);
4903 /* Skip dummy type units. */
4904 if (ptr >= info_ptr + length
4905 || peek_abbrev_code (abfd, ptr) == 0
4906 || header.unit_type != DW_UT_type)
4912 if (types_htab == NULL)
4915 types_htab = allocate_dwo_unit_table (objfile);
4917 types_htab = allocate_signatured_type_table (objfile);
4923 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4925 dwo_tu->dwo_file = dwo_file;
4926 dwo_tu->signature = header.signature;
4927 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
4928 dwo_tu->section = section;
4929 dwo_tu->sect_off = sect_off;
4930 dwo_tu->length = length;
4934 /* N.B.: type_offset is not usable if this type uses a DWO file.
4935 The real type_offset is in the DWO file. */
4937 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4938 struct signatured_type);
4939 sig_type->signature = header.signature;
4940 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
4941 sig_type->per_cu.objfile = objfile;
4942 sig_type->per_cu.is_debug_types = 1;
4943 sig_type->per_cu.section = section;
4944 sig_type->per_cu.sect_off = sect_off;
4945 sig_type->per_cu.length = length;
4948 slot = htab_find_slot (types_htab,
4949 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4951 gdb_assert (slot != NULL);
4954 sect_offset dup_sect_off;
4958 const struct dwo_unit *dup_tu
4959 = (const struct dwo_unit *) *slot;
4961 dup_sect_off = dup_tu->sect_off;
4965 const struct signatured_type *dup_tu
4966 = (const struct signatured_type *) *slot;
4968 dup_sect_off = dup_tu->per_cu.sect_off;
4971 complaint (&symfile_complaints,
4972 _("debug type entry at offset 0x%x is duplicate to"
4973 " the entry at offset 0x%x, signature %s"),
4974 to_underlying (sect_off), to_underlying (dup_sect_off),
4975 hex_string (header.signature));
4977 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4979 if (dwarf_read_debug > 1)
4980 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4981 to_underlying (sect_off),
4982 hex_string (header.signature));
4988 /* Create the hash table of all entries in the .debug_types
4989 (or .debug_types.dwo) section(s).
4990 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4991 otherwise it is NULL.
4993 The result is a pointer to the hash table or NULL if there are no types.
4995 Note: This function processes DWO files only, not DWP files. */
4998 create_debug_types_hash_table (struct dwo_file *dwo_file,
4999 VEC (dwarf2_section_info_def) *types,
5003 struct dwarf2_section_info *section;
5005 if (VEC_empty (dwarf2_section_info_def, types))
5009 VEC_iterate (dwarf2_section_info_def, types, ix, section);
5011 create_debug_type_hash_table (dwo_file, section, types_htab,
5015 /* Create the hash table of all entries in the .debug_types section,
5016 and initialize all_type_units.
5017 The result is zero if there is an error (e.g. missing .debug_types section),
5018 otherwise non-zero. */
5021 create_all_type_units (struct objfile *objfile)
5023 htab_t types_htab = NULL;
5024 struct signatured_type **iter;
5026 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
5027 rcuh_kind::COMPILE);
5028 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
5029 if (types_htab == NULL)
5031 dwarf2_per_objfile->signatured_types = NULL;
5035 dwarf2_per_objfile->signatured_types = types_htab;
5037 dwarf2_per_objfile->n_type_units
5038 = dwarf2_per_objfile->n_allocated_type_units
5039 = htab_elements (types_htab);
5040 dwarf2_per_objfile->all_type_units =
5041 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
5042 iter = &dwarf2_per_objfile->all_type_units[0];
5043 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
5044 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
5045 == dwarf2_per_objfile->n_type_units);
5050 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
5051 If SLOT is non-NULL, it is the entry to use in the hash table.
5052 Otherwise we find one. */
5054 static struct signatured_type *
5055 add_type_unit (ULONGEST sig, void **slot)
5057 struct objfile *objfile = dwarf2_per_objfile->objfile;
5058 int n_type_units = dwarf2_per_objfile->n_type_units;
5059 struct signatured_type *sig_type;
5061 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
5063 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
5065 if (dwarf2_per_objfile->n_allocated_type_units == 0)
5066 dwarf2_per_objfile->n_allocated_type_units = 1;
5067 dwarf2_per_objfile->n_allocated_type_units *= 2;
5068 dwarf2_per_objfile->all_type_units
5069 = XRESIZEVEC (struct signatured_type *,
5070 dwarf2_per_objfile->all_type_units,
5071 dwarf2_per_objfile->n_allocated_type_units);
5072 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5074 dwarf2_per_objfile->n_type_units = n_type_units;
5076 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5077 struct signatured_type);
5078 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5079 sig_type->signature = sig;
5080 sig_type->per_cu.is_debug_types = 1;
5081 if (dwarf2_per_objfile->using_index)
5083 sig_type->per_cu.v.quick =
5084 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5085 struct dwarf2_per_cu_quick_data);
5090 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5093 gdb_assert (*slot == NULL);
5095 /* The rest of sig_type must be filled in by the caller. */
5099 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5100 Fill in SIG_ENTRY with DWO_ENTRY. */
5103 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5104 struct signatured_type *sig_entry,
5105 struct dwo_unit *dwo_entry)
5107 /* Make sure we're not clobbering something we don't expect to. */
5108 gdb_assert (! sig_entry->per_cu.queued);
5109 gdb_assert (sig_entry->per_cu.cu == NULL);
5110 if (dwarf2_per_objfile->using_index)
5112 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5113 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5116 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5117 gdb_assert (sig_entry->signature == dwo_entry->signature);
5118 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5119 gdb_assert (sig_entry->type_unit_group == NULL);
5120 gdb_assert (sig_entry->dwo_unit == NULL);
5122 sig_entry->per_cu.section = dwo_entry->section;
5123 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5124 sig_entry->per_cu.length = dwo_entry->length;
5125 sig_entry->per_cu.reading_dwo_directly = 1;
5126 sig_entry->per_cu.objfile = objfile;
5127 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5128 sig_entry->dwo_unit = dwo_entry;
5131 /* Subroutine of lookup_signatured_type.
5132 If we haven't read the TU yet, create the signatured_type data structure
5133 for a TU to be read in directly from a DWO file, bypassing the stub.
5134 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5135 using .gdb_index, then when reading a CU we want to stay in the DWO file
5136 containing that CU. Otherwise we could end up reading several other DWO
5137 files (due to comdat folding) to process the transitive closure of all the
5138 mentioned TUs, and that can be slow. The current DWO file will have every
5139 type signature that it needs.
5140 We only do this for .gdb_index because in the psymtab case we already have
5141 to read all the DWOs to build the type unit groups. */
5143 static struct signatured_type *
5144 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5146 struct objfile *objfile = dwarf2_per_objfile->objfile;
5147 struct dwo_file *dwo_file;
5148 struct dwo_unit find_dwo_entry, *dwo_entry;
5149 struct signatured_type find_sig_entry, *sig_entry;
5152 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5154 /* If TU skeletons have been removed then we may not have read in any
5156 if (dwarf2_per_objfile->signatured_types == NULL)
5158 dwarf2_per_objfile->signatured_types
5159 = allocate_signatured_type_table (objfile);
5162 /* We only ever need to read in one copy of a signatured type.
5163 Use the global signatured_types array to do our own comdat-folding
5164 of types. If this is the first time we're reading this TU, and
5165 the TU has an entry in .gdb_index, replace the recorded data from
5166 .gdb_index with this TU. */
5168 find_sig_entry.signature = sig;
5169 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5170 &find_sig_entry, INSERT);
5171 sig_entry = (struct signatured_type *) *slot;
5173 /* We can get here with the TU already read, *or* in the process of being
5174 read. Don't reassign the global entry to point to this DWO if that's
5175 the case. Also note that if the TU is already being read, it may not
5176 have come from a DWO, the program may be a mix of Fission-compiled
5177 code and non-Fission-compiled code. */
5179 /* Have we already tried to read this TU?
5180 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5181 needn't exist in the global table yet). */
5182 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
5185 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
5186 dwo_unit of the TU itself. */
5187 dwo_file = cu->dwo_unit->dwo_file;
5189 /* Ok, this is the first time we're reading this TU. */
5190 if (dwo_file->tus == NULL)
5192 find_dwo_entry.signature = sig;
5193 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
5194 if (dwo_entry == NULL)
5197 /* If the global table doesn't have an entry for this TU, add one. */
5198 if (sig_entry == NULL)
5199 sig_entry = add_type_unit (sig, slot);
5201 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5202 sig_entry->per_cu.tu_read = 1;
5206 /* Subroutine of lookup_signatured_type.
5207 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
5208 then try the DWP file. If the TU stub (skeleton) has been removed then
5209 it won't be in .gdb_index. */
5211 static struct signatured_type *
5212 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5214 struct objfile *objfile = dwarf2_per_objfile->objfile;
5215 struct dwp_file *dwp_file = get_dwp_file ();
5216 struct dwo_unit *dwo_entry;
5217 struct signatured_type find_sig_entry, *sig_entry;
5220 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5221 gdb_assert (dwp_file != NULL);
5223 /* If TU skeletons have been removed then we may not have read in any
5225 if (dwarf2_per_objfile->signatured_types == NULL)
5227 dwarf2_per_objfile->signatured_types
5228 = allocate_signatured_type_table (objfile);
5231 find_sig_entry.signature = sig;
5232 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5233 &find_sig_entry, INSERT);
5234 sig_entry = (struct signatured_type *) *slot;
5236 /* Have we already tried to read this TU?
5237 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5238 needn't exist in the global table yet). */
5239 if (sig_entry != NULL)
5242 if (dwp_file->tus == NULL)
5244 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5245 sig, 1 /* is_debug_types */);
5246 if (dwo_entry == NULL)
5249 sig_entry = add_type_unit (sig, slot);
5250 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5255 /* Lookup a signature based type for DW_FORM_ref_sig8.
5256 Returns NULL if signature SIG is not present in the table.
5257 It is up to the caller to complain about this. */
5259 static struct signatured_type *
5260 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5263 && dwarf2_per_objfile->using_index)
5265 /* We're in a DWO/DWP file, and we're using .gdb_index.
5266 These cases require special processing. */
5267 if (get_dwp_file () == NULL)
5268 return lookup_dwo_signatured_type (cu, sig);
5270 return lookup_dwp_signatured_type (cu, sig);
5274 struct signatured_type find_entry, *entry;
5276 if (dwarf2_per_objfile->signatured_types == NULL)
5278 find_entry.signature = sig;
5279 entry = ((struct signatured_type *)
5280 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5285 /* Low level DIE reading support. */
5287 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5290 init_cu_die_reader (struct die_reader_specs *reader,
5291 struct dwarf2_cu *cu,
5292 struct dwarf2_section_info *section,
5293 struct dwo_file *dwo_file)
5295 gdb_assert (section->readin && section->buffer != NULL);
5296 reader->abfd = get_section_bfd_owner (section);
5298 reader->dwo_file = dwo_file;
5299 reader->die_section = section;
5300 reader->buffer = section->buffer;
5301 reader->buffer_end = section->buffer + section->size;
5302 reader->comp_dir = NULL;
5305 /* Subroutine of init_cutu_and_read_dies to simplify it.
5306 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5307 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5310 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5311 from it to the DIE in the DWO. If NULL we are skipping the stub.
5312 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5313 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5314 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5315 STUB_COMP_DIR may be non-NULL.
5316 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5317 are filled in with the info of the DIE from the DWO file.
5318 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5319 provided an abbrev table to use.
5320 The result is non-zero if a valid (non-dummy) DIE was found. */
5323 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5324 struct dwo_unit *dwo_unit,
5325 int abbrev_table_provided,
5326 struct die_info *stub_comp_unit_die,
5327 const char *stub_comp_dir,
5328 struct die_reader_specs *result_reader,
5329 const gdb_byte **result_info_ptr,
5330 struct die_info **result_comp_unit_die,
5331 int *result_has_children)
5333 struct objfile *objfile = dwarf2_per_objfile->objfile;
5334 struct dwarf2_cu *cu = this_cu->cu;
5335 struct dwarf2_section_info *section;
5337 const gdb_byte *begin_info_ptr, *info_ptr;
5338 ULONGEST signature; /* Or dwo_id. */
5339 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5340 int i,num_extra_attrs;
5341 struct dwarf2_section_info *dwo_abbrev_section;
5342 struct attribute *attr;
5343 struct die_info *comp_unit_die;
5345 /* At most one of these may be provided. */
5346 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5348 /* These attributes aren't processed until later:
5349 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5350 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5351 referenced later. However, these attributes are found in the stub
5352 which we won't have later. In order to not impose this complication
5353 on the rest of the code, we read them here and copy them to the
5362 if (stub_comp_unit_die != NULL)
5364 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5366 if (! this_cu->is_debug_types)
5367 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5368 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5369 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5370 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5371 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5373 /* There should be a DW_AT_addr_base attribute here (if needed).
5374 We need the value before we can process DW_FORM_GNU_addr_index. */
5376 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5378 cu->addr_base = DW_UNSND (attr);
5380 /* There should be a DW_AT_ranges_base attribute here (if needed).
5381 We need the value before we can process DW_AT_ranges. */
5382 cu->ranges_base = 0;
5383 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5385 cu->ranges_base = DW_UNSND (attr);
5387 else if (stub_comp_dir != NULL)
5389 /* Reconstruct the comp_dir attribute to simplify the code below. */
5390 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5391 comp_dir->name = DW_AT_comp_dir;
5392 comp_dir->form = DW_FORM_string;
5393 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5394 DW_STRING (comp_dir) = stub_comp_dir;
5397 /* Set up for reading the DWO CU/TU. */
5398 cu->dwo_unit = dwo_unit;
5399 section = dwo_unit->section;
5400 dwarf2_read_section (objfile, section);
5401 abfd = get_section_bfd_owner (section);
5402 begin_info_ptr = info_ptr = (section->buffer
5403 + to_underlying (dwo_unit->sect_off));
5404 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5405 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5407 if (this_cu->is_debug_types)
5409 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5411 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5413 info_ptr, rcuh_kind::TYPE);
5414 /* This is not an assert because it can be caused by bad debug info. */
5415 if (sig_type->signature != cu->header.signature)
5417 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5418 " TU at offset 0x%x [in module %s]"),
5419 hex_string (sig_type->signature),
5420 hex_string (cu->header.signature),
5421 to_underlying (dwo_unit->sect_off),
5422 bfd_get_filename (abfd));
5424 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5425 /* For DWOs coming from DWP files, we don't know the CU length
5426 nor the type's offset in the TU until now. */
5427 dwo_unit->length = get_cu_length (&cu->header);
5428 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
5430 /* Establish the type offset that can be used to lookup the type.
5431 For DWO files, we don't know it until now. */
5432 sig_type->type_offset_in_section
5433 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
5437 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5439 info_ptr, rcuh_kind::COMPILE);
5440 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5441 /* For DWOs coming from DWP files, we don't know the CU length
5443 dwo_unit->length = get_cu_length (&cu->header);
5446 /* Replace the CU's original abbrev table with the DWO's.
5447 Reminder: We can't read the abbrev table until we've read the header. */
5448 if (abbrev_table_provided)
5450 /* Don't free the provided abbrev table, the caller of
5451 init_cutu_and_read_dies owns it. */
5452 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5453 /* Ensure the DWO abbrev table gets freed. */
5454 make_cleanup (dwarf2_free_abbrev_table, cu);
5458 dwarf2_free_abbrev_table (cu);
5459 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5460 /* Leave any existing abbrev table cleanup as is. */
5463 /* Read in the die, but leave space to copy over the attributes
5464 from the stub. This has the benefit of simplifying the rest of
5465 the code - all the work to maintain the illusion of a single
5466 DW_TAG_{compile,type}_unit DIE is done here. */
5467 num_extra_attrs = ((stmt_list != NULL)
5471 + (comp_dir != NULL));
5472 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5473 result_has_children, num_extra_attrs);
5475 /* Copy over the attributes from the stub to the DIE we just read in. */
5476 comp_unit_die = *result_comp_unit_die;
5477 i = comp_unit_die->num_attrs;
5478 if (stmt_list != NULL)
5479 comp_unit_die->attrs[i++] = *stmt_list;
5481 comp_unit_die->attrs[i++] = *low_pc;
5482 if (high_pc != NULL)
5483 comp_unit_die->attrs[i++] = *high_pc;
5485 comp_unit_die->attrs[i++] = *ranges;
5486 if (comp_dir != NULL)
5487 comp_unit_die->attrs[i++] = *comp_dir;
5488 comp_unit_die->num_attrs += num_extra_attrs;
5490 if (dwarf_die_debug)
5492 fprintf_unfiltered (gdb_stdlog,
5493 "Read die from %s@0x%x of %s:\n",
5494 get_section_name (section),
5495 (unsigned) (begin_info_ptr - section->buffer),
5496 bfd_get_filename (abfd));
5497 dump_die (comp_unit_die, dwarf_die_debug);
5500 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5501 TUs by skipping the stub and going directly to the entry in the DWO file.
5502 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5503 to get it via circuitous means. Blech. */
5504 if (comp_dir != NULL)
5505 result_reader->comp_dir = DW_STRING (comp_dir);
5507 /* Skip dummy compilation units. */
5508 if (info_ptr >= begin_info_ptr + dwo_unit->length
5509 || peek_abbrev_code (abfd, info_ptr) == 0)
5512 *result_info_ptr = info_ptr;
5516 /* Subroutine of init_cutu_and_read_dies to simplify it.
5517 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5518 Returns NULL if the specified DWO unit cannot be found. */
5520 static struct dwo_unit *
5521 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5522 struct die_info *comp_unit_die)
5524 struct dwarf2_cu *cu = this_cu->cu;
5525 struct attribute *attr;
5527 struct dwo_unit *dwo_unit;
5528 const char *comp_dir, *dwo_name;
5530 gdb_assert (cu != NULL);
5532 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5533 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5534 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5536 if (this_cu->is_debug_types)
5538 struct signatured_type *sig_type;
5540 /* Since this_cu is the first member of struct signatured_type,
5541 we can go from a pointer to one to a pointer to the other. */
5542 sig_type = (struct signatured_type *) this_cu;
5543 signature = sig_type->signature;
5544 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5548 struct attribute *attr;
5550 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5552 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5554 dwo_name, objfile_name (this_cu->objfile));
5555 signature = DW_UNSND (attr);
5556 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5563 /* Subroutine of init_cutu_and_read_dies to simplify it.
5564 See it for a description of the parameters.
5565 Read a TU directly from a DWO file, bypassing the stub.
5567 Note: This function could be a little bit simpler if we shared cleanups
5568 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
5569 to do, so we keep this function self-contained. Or we could move this
5570 into our caller, but it's complex enough already. */
5573 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
5574 int use_existing_cu, int keep,
5575 die_reader_func_ftype *die_reader_func,
5578 struct dwarf2_cu *cu;
5579 struct signatured_type *sig_type;
5580 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5581 struct die_reader_specs reader;
5582 const gdb_byte *info_ptr;
5583 struct die_info *comp_unit_die;
5586 /* Verify we can do the following downcast, and that we have the
5588 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5589 sig_type = (struct signatured_type *) this_cu;
5590 gdb_assert (sig_type->dwo_unit != NULL);
5592 cleanups = make_cleanup (null_cleanup, NULL);
5594 if (use_existing_cu && this_cu->cu != NULL)
5596 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
5598 /* There's no need to do the rereading_dwo_cu handling that
5599 init_cutu_and_read_dies does since we don't read the stub. */
5603 /* If !use_existing_cu, this_cu->cu must be NULL. */
5604 gdb_assert (this_cu->cu == NULL);
5605 cu = XNEW (struct dwarf2_cu);
5606 init_one_comp_unit (cu, this_cu);
5607 /* If an error occurs while loading, release our storage. */
5608 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5611 /* A future optimization, if needed, would be to use an existing
5612 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
5613 could share abbrev tables. */
5615 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5616 0 /* abbrev_table_provided */,
5617 NULL /* stub_comp_unit_die */,
5618 sig_type->dwo_unit->dwo_file->comp_dir,
5620 &comp_unit_die, &has_children) == 0)
5623 do_cleanups (cleanups);
5627 /* All the "real" work is done here. */
5628 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5630 /* This duplicates the code in init_cutu_and_read_dies,
5631 but the alternative is making the latter more complex.
5632 This function is only for the special case of using DWO files directly:
5633 no point in overly complicating the general case just to handle this. */
5634 if (free_cu_cleanup != NULL)
5638 /* We've successfully allocated this compilation unit. Let our
5639 caller clean it up when finished with it. */
5640 discard_cleanups (free_cu_cleanup);
5642 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5643 So we have to manually free the abbrev table. */
5644 dwarf2_free_abbrev_table (cu);
5646 /* Link this CU into read_in_chain. */
5647 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5648 dwarf2_per_objfile->read_in_chain = this_cu;
5651 do_cleanups (free_cu_cleanup);
5654 do_cleanups (cleanups);
5657 /* Initialize a CU (or TU) and read its DIEs.
5658 If the CU defers to a DWO file, read the DWO file as well.
5660 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5661 Otherwise the table specified in the comp unit header is read in and used.
5662 This is an optimization for when we already have the abbrev table.
5664 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5665 Otherwise, a new CU is allocated with xmalloc.
5667 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5668 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5670 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5671 linker) then DIE_READER_FUNC will not get called. */
5674 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5675 struct abbrev_table *abbrev_table,
5676 int use_existing_cu, int keep,
5677 die_reader_func_ftype *die_reader_func,
5680 struct objfile *objfile = dwarf2_per_objfile->objfile;
5681 struct dwarf2_section_info *section = this_cu->section;
5682 bfd *abfd = get_section_bfd_owner (section);
5683 struct dwarf2_cu *cu;
5684 const gdb_byte *begin_info_ptr, *info_ptr;
5685 struct die_reader_specs reader;
5686 struct die_info *comp_unit_die;
5688 struct attribute *attr;
5689 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5690 struct signatured_type *sig_type = NULL;
5691 struct dwarf2_section_info *abbrev_section;
5692 /* Non-zero if CU currently points to a DWO file and we need to
5693 reread it. When this happens we need to reread the skeleton die
5694 before we can reread the DWO file (this only applies to CUs, not TUs). */
5695 int rereading_dwo_cu = 0;
5697 if (dwarf_die_debug)
5698 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5699 this_cu->is_debug_types ? "type" : "comp",
5700 to_underlying (this_cu->sect_off));
5702 if (use_existing_cu)
5705 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5706 file (instead of going through the stub), short-circuit all of this. */
5707 if (this_cu->reading_dwo_directly)
5709 /* Narrow down the scope of possibilities to have to understand. */
5710 gdb_assert (this_cu->is_debug_types);
5711 gdb_assert (abbrev_table == NULL);
5712 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
5713 die_reader_func, data);
5717 cleanups = make_cleanup (null_cleanup, NULL);
5719 /* This is cheap if the section is already read in. */
5720 dwarf2_read_section (objfile, section);
5722 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5724 abbrev_section = get_abbrev_section_for_cu (this_cu);
5726 if (use_existing_cu && this_cu->cu != NULL)
5729 /* If this CU is from a DWO file we need to start over, we need to
5730 refetch the attributes from the skeleton CU.
5731 This could be optimized by retrieving those attributes from when we
5732 were here the first time: the previous comp_unit_die was stored in
5733 comp_unit_obstack. But there's no data yet that we need this
5735 if (cu->dwo_unit != NULL)
5736 rereading_dwo_cu = 1;
5740 /* If !use_existing_cu, this_cu->cu must be NULL. */
5741 gdb_assert (this_cu->cu == NULL);
5742 cu = XNEW (struct dwarf2_cu);
5743 init_one_comp_unit (cu, this_cu);
5744 /* If an error occurs while loading, release our storage. */
5745 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5748 /* Get the header. */
5749 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
5751 /* We already have the header, there's no need to read it in again. */
5752 info_ptr += to_underlying (cu->header.first_die_cu_offset);
5756 if (this_cu->is_debug_types)
5758 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5759 abbrev_section, info_ptr,
5762 /* Since per_cu is the first member of struct signatured_type,
5763 we can go from a pointer to one to a pointer to the other. */
5764 sig_type = (struct signatured_type *) this_cu;
5765 gdb_assert (sig_type->signature == cu->header.signature);
5766 gdb_assert (sig_type->type_offset_in_tu
5767 == cu->header.type_cu_offset_in_tu);
5768 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5770 /* LENGTH has not been set yet for type units if we're
5771 using .gdb_index. */
5772 this_cu->length = get_cu_length (&cu->header);
5774 /* Establish the type offset that can be used to lookup the type. */
5775 sig_type->type_offset_in_section =
5776 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
5778 this_cu->dwarf_version = cu->header.version;
5782 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5785 rcuh_kind::COMPILE);
5787 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5788 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5789 this_cu->dwarf_version = cu->header.version;
5793 /* Skip dummy compilation units. */
5794 if (info_ptr >= begin_info_ptr + this_cu->length
5795 || peek_abbrev_code (abfd, info_ptr) == 0)
5797 do_cleanups (cleanups);
5801 /* If we don't have them yet, read the abbrevs for this compilation unit.
5802 And if we need to read them now, make sure they're freed when we're
5803 done. Note that it's important that if the CU had an abbrev table
5804 on entry we don't free it when we're done: Somewhere up the call stack
5805 it may be in use. */
5806 if (abbrev_table != NULL)
5808 gdb_assert (cu->abbrev_table == NULL);
5809 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
5810 cu->abbrev_table = abbrev_table;
5812 else if (cu->abbrev_table == NULL)
5814 dwarf2_read_abbrevs (cu, abbrev_section);
5815 make_cleanup (dwarf2_free_abbrev_table, cu);
5817 else if (rereading_dwo_cu)
5819 dwarf2_free_abbrev_table (cu);
5820 dwarf2_read_abbrevs (cu, abbrev_section);
5823 /* Read the top level CU/TU die. */
5824 init_cu_die_reader (&reader, cu, section, NULL);
5825 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5827 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5829 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5830 DWO CU, that this test will fail (the attribute will not be present). */
5831 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5834 struct dwo_unit *dwo_unit;
5835 struct die_info *dwo_comp_unit_die;
5839 complaint (&symfile_complaints,
5840 _("compilation unit with DW_AT_GNU_dwo_name"
5841 " has children (offset 0x%x) [in module %s]"),
5842 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
5844 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5845 if (dwo_unit != NULL)
5847 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5848 abbrev_table != NULL,
5849 comp_unit_die, NULL,
5851 &dwo_comp_unit_die, &has_children) == 0)
5854 do_cleanups (cleanups);
5857 comp_unit_die = dwo_comp_unit_die;
5861 /* Yikes, we couldn't find the rest of the DIE, we only have
5862 the stub. A complaint has already been logged. There's
5863 not much more we can do except pass on the stub DIE to
5864 die_reader_func. We don't want to throw an error on bad
5869 /* All of the above is setup for this call. Yikes. */
5870 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5872 /* Done, clean up. */
5873 if (free_cu_cleanup != NULL)
5877 /* We've successfully allocated this compilation unit. Let our
5878 caller clean it up when finished with it. */
5879 discard_cleanups (free_cu_cleanup);
5881 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5882 So we have to manually free the abbrev table. */
5883 dwarf2_free_abbrev_table (cu);
5885 /* Link this CU into read_in_chain. */
5886 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5887 dwarf2_per_objfile->read_in_chain = this_cu;
5890 do_cleanups (free_cu_cleanup);
5893 do_cleanups (cleanups);
5896 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5897 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5898 to have already done the lookup to find the DWO file).
5900 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5901 THIS_CU->is_debug_types, but nothing else.
5903 We fill in THIS_CU->length.
5905 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5906 linker) then DIE_READER_FUNC will not get called.
5908 THIS_CU->cu is always freed when done.
5909 This is done in order to not leave THIS_CU->cu in a state where we have
5910 to care whether it refers to the "main" CU or the DWO CU. */
5913 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5914 struct dwo_file *dwo_file,
5915 die_reader_func_ftype *die_reader_func,
5918 struct objfile *objfile = dwarf2_per_objfile->objfile;
5919 struct dwarf2_section_info *section = this_cu->section;
5920 bfd *abfd = get_section_bfd_owner (section);
5921 struct dwarf2_section_info *abbrev_section;
5922 struct dwarf2_cu cu;
5923 const gdb_byte *begin_info_ptr, *info_ptr;
5924 struct die_reader_specs reader;
5925 struct cleanup *cleanups;
5926 struct die_info *comp_unit_die;
5929 if (dwarf_die_debug)
5930 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5931 this_cu->is_debug_types ? "type" : "comp",
5932 to_underlying (this_cu->sect_off));
5934 gdb_assert (this_cu->cu == NULL);
5936 abbrev_section = (dwo_file != NULL
5937 ? &dwo_file->sections.abbrev
5938 : get_abbrev_section_for_cu (this_cu));
5940 /* This is cheap if the section is already read in. */
5941 dwarf2_read_section (objfile, section);
5943 init_one_comp_unit (&cu, this_cu);
5945 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5947 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5948 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5949 abbrev_section, info_ptr,
5950 (this_cu->is_debug_types
5952 : rcuh_kind::COMPILE));
5954 this_cu->length = get_cu_length (&cu.header);
5956 /* Skip dummy compilation units. */
5957 if (info_ptr >= begin_info_ptr + this_cu->length
5958 || peek_abbrev_code (abfd, info_ptr) == 0)
5960 do_cleanups (cleanups);
5964 dwarf2_read_abbrevs (&cu, abbrev_section);
5965 make_cleanup (dwarf2_free_abbrev_table, &cu);
5967 init_cu_die_reader (&reader, &cu, section, dwo_file);
5968 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5970 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5972 do_cleanups (cleanups);
5975 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5976 does not lookup the specified DWO file.
5977 This cannot be used to read DWO files.
5979 THIS_CU->cu is always freed when done.
5980 This is done in order to not leave THIS_CU->cu in a state where we have
5981 to care whether it refers to the "main" CU or the DWO CU.
5982 We can revisit this if the data shows there's a performance issue. */
5985 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5986 die_reader_func_ftype *die_reader_func,
5989 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5992 /* Type Unit Groups.
5994 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5995 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5996 so that all types coming from the same compilation (.o file) are grouped
5997 together. A future step could be to put the types in the same symtab as
5998 the CU the types ultimately came from. */
6001 hash_type_unit_group (const void *item)
6003 const struct type_unit_group *tu_group
6004 = (const struct type_unit_group *) item;
6006 return hash_stmt_list_entry (&tu_group->hash);
6010 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
6012 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
6013 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
6015 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
6018 /* Allocate a hash table for type unit groups. */
6021 allocate_type_unit_groups_table (void)
6023 return htab_create_alloc_ex (3,
6024 hash_type_unit_group,
6027 &dwarf2_per_objfile->objfile->objfile_obstack,
6028 hashtab_obstack_allocate,
6029 dummy_obstack_deallocate);
6032 /* Type units that don't have DW_AT_stmt_list are grouped into their own
6033 partial symtabs. We combine several TUs per psymtab to not let the size
6034 of any one psymtab grow too big. */
6035 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
6036 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
6038 /* Helper routine for get_type_unit_group.
6039 Create the type_unit_group object used to hold one or more TUs. */
6041 static struct type_unit_group *
6042 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
6044 struct objfile *objfile = dwarf2_per_objfile->objfile;
6045 struct dwarf2_per_cu_data *per_cu;
6046 struct type_unit_group *tu_group;
6048 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6049 struct type_unit_group);
6050 per_cu = &tu_group->per_cu;
6051 per_cu->objfile = objfile;
6053 if (dwarf2_per_objfile->using_index)
6055 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6056 struct dwarf2_per_cu_quick_data);
6060 unsigned int line_offset = to_underlying (line_offset_struct);
6061 struct partial_symtab *pst;
6064 /* Give the symtab a useful name for debug purposes. */
6065 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
6066 name = xstrprintf ("<type_units_%d>",
6067 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6069 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6071 pst = create_partial_symtab (per_cu, name);
6077 tu_group->hash.dwo_unit = cu->dwo_unit;
6078 tu_group->hash.line_sect_off = line_offset_struct;
6083 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6084 STMT_LIST is a DW_AT_stmt_list attribute. */
6086 static struct type_unit_group *
6087 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6089 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6090 struct type_unit_group *tu_group;
6092 unsigned int line_offset;
6093 struct type_unit_group type_unit_group_for_lookup;
6095 if (dwarf2_per_objfile->type_unit_groups == NULL)
6097 dwarf2_per_objfile->type_unit_groups =
6098 allocate_type_unit_groups_table ();
6101 /* Do we need to create a new group, or can we use an existing one? */
6105 line_offset = DW_UNSND (stmt_list);
6106 ++tu_stats->nr_symtab_sharers;
6110 /* Ugh, no stmt_list. Rare, but we have to handle it.
6111 We can do various things here like create one group per TU or
6112 spread them over multiple groups to split up the expansion work.
6113 To avoid worst case scenarios (too many groups or too large groups)
6114 we, umm, group them in bunches. */
6115 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6116 | (tu_stats->nr_stmt_less_type_units
6117 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6118 ++tu_stats->nr_stmt_less_type_units;
6121 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6122 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6123 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6124 &type_unit_group_for_lookup, INSERT);
6127 tu_group = (struct type_unit_group *) *slot;
6128 gdb_assert (tu_group != NULL);
6132 sect_offset line_offset_struct = (sect_offset) line_offset;
6133 tu_group = create_type_unit_group (cu, line_offset_struct);
6135 ++tu_stats->nr_symtabs;
6141 /* Partial symbol tables. */
6143 /* Create a psymtab named NAME and assign it to PER_CU.
6145 The caller must fill in the following details:
6146 dirname, textlow, texthigh. */
6148 static struct partial_symtab *
6149 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
6151 struct objfile *objfile = per_cu->objfile;
6152 struct partial_symtab *pst;
6154 pst = start_psymtab_common (objfile, name, 0,
6155 objfile->global_psymbols.next,
6156 objfile->static_psymbols.next);
6158 pst->psymtabs_addrmap_supported = 1;
6160 /* This is the glue that links PST into GDB's symbol API. */
6161 pst->read_symtab_private = per_cu;
6162 pst->read_symtab = dwarf2_read_symtab;
6163 per_cu->v.psymtab = pst;
6168 /* The DATA object passed to process_psymtab_comp_unit_reader has this
6171 struct process_psymtab_comp_unit_data
6173 /* True if we are reading a DW_TAG_partial_unit. */
6175 int want_partial_unit;
6177 /* The "pretend" language that is used if the CU doesn't declare a
6180 enum language pretend_language;
6183 /* die_reader_func for process_psymtab_comp_unit. */
6186 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
6187 const gdb_byte *info_ptr,
6188 struct die_info *comp_unit_die,
6192 struct dwarf2_cu *cu = reader->cu;
6193 struct objfile *objfile = cu->objfile;
6194 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6195 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6197 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6198 struct partial_symtab *pst;
6199 enum pc_bounds_kind cu_bounds_kind;
6200 const char *filename;
6201 struct process_psymtab_comp_unit_data *info
6202 = (struct process_psymtab_comp_unit_data *) data;
6204 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6207 gdb_assert (! per_cu->is_debug_types);
6209 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6211 cu->list_in_scope = &file_symbols;
6213 /* Allocate a new partial symbol table structure. */
6214 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
6215 if (filename == NULL)
6218 pst = create_partial_symtab (per_cu, filename);
6220 /* This must be done before calling dwarf2_build_include_psymtabs. */
6221 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6223 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6225 dwarf2_find_base_address (comp_unit_die, cu);
6227 /* Possibly set the default values of LOWPC and HIGHPC from
6229 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6230 &best_highpc, cu, pst);
6231 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6232 /* Store the contiguous range if it is not empty; it can be empty for
6233 CUs with no code. */
6234 addrmap_set_empty (objfile->psymtabs_addrmap,
6235 gdbarch_adjust_dwarf2_addr (gdbarch,
6236 best_lowpc + baseaddr),
6237 gdbarch_adjust_dwarf2_addr (gdbarch,
6238 best_highpc + baseaddr) - 1,
6241 /* Check if comp unit has_children.
6242 If so, read the rest of the partial symbols from this comp unit.
6243 If not, there's no more debug_info for this comp unit. */
6246 struct partial_die_info *first_die;
6247 CORE_ADDR lowpc, highpc;
6249 lowpc = ((CORE_ADDR) -1);
6250 highpc = ((CORE_ADDR) 0);
6252 first_die = load_partial_dies (reader, info_ptr, 1);
6254 scan_partial_symbols (first_die, &lowpc, &highpc,
6255 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6257 /* If we didn't find a lowpc, set it to highpc to avoid
6258 complaints from `maint check'. */
6259 if (lowpc == ((CORE_ADDR) -1))
6262 /* If the compilation unit didn't have an explicit address range,
6263 then use the information extracted from its child dies. */
6264 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6267 best_highpc = highpc;
6270 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6271 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6273 end_psymtab_common (objfile, pst);
6275 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6278 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6279 struct dwarf2_per_cu_data *iter;
6281 /* Fill in 'dependencies' here; we fill in 'users' in a
6283 pst->number_of_dependencies = len;
6285 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6287 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6290 pst->dependencies[i] = iter->v.psymtab;
6292 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6295 /* Get the list of files included in the current compilation unit,
6296 and build a psymtab for each of them. */
6297 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6299 if (dwarf_read_debug)
6301 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6303 fprintf_unfiltered (gdb_stdlog,
6304 "Psymtab for %s unit @0x%x: %s - %s"
6305 ", %d global, %d static syms\n",
6306 per_cu->is_debug_types ? "type" : "comp",
6307 to_underlying (per_cu->sect_off),
6308 paddress (gdbarch, pst->textlow),
6309 paddress (gdbarch, pst->texthigh),
6310 pst->n_global_syms, pst->n_static_syms);
6314 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6315 Process compilation unit THIS_CU for a psymtab. */
6318 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6319 int want_partial_unit,
6320 enum language pretend_language)
6322 /* If this compilation unit was already read in, free the
6323 cached copy in order to read it in again. This is
6324 necessary because we skipped some symbols when we first
6325 read in the compilation unit (see load_partial_dies).
6326 This problem could be avoided, but the benefit is unclear. */
6327 if (this_cu->cu != NULL)
6328 free_one_cached_comp_unit (this_cu);
6330 if (this_cu->is_debug_types)
6331 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
6335 process_psymtab_comp_unit_data info;
6336 info.want_partial_unit = want_partial_unit;
6337 info.pretend_language = pretend_language;
6338 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6339 process_psymtab_comp_unit_reader, &info);
6342 /* Age out any secondary CUs. */
6343 age_cached_comp_units ();
6346 /* Reader function for build_type_psymtabs. */
6349 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6350 const gdb_byte *info_ptr,
6351 struct die_info *type_unit_die,
6355 struct objfile *objfile = dwarf2_per_objfile->objfile;
6356 struct dwarf2_cu *cu = reader->cu;
6357 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6358 struct signatured_type *sig_type;
6359 struct type_unit_group *tu_group;
6360 struct attribute *attr;
6361 struct partial_die_info *first_die;
6362 CORE_ADDR lowpc, highpc;
6363 struct partial_symtab *pst;
6365 gdb_assert (data == NULL);
6366 gdb_assert (per_cu->is_debug_types);
6367 sig_type = (struct signatured_type *) per_cu;
6372 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6373 tu_group = get_type_unit_group (cu, attr);
6375 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6377 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6378 cu->list_in_scope = &file_symbols;
6379 pst = create_partial_symtab (per_cu, "");
6382 first_die = load_partial_dies (reader, info_ptr, 1);
6384 lowpc = (CORE_ADDR) -1;
6385 highpc = (CORE_ADDR) 0;
6386 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6388 end_psymtab_common (objfile, pst);
6391 /* Struct used to sort TUs by their abbreviation table offset. */
6393 struct tu_abbrev_offset
6395 struct signatured_type *sig_type;
6396 sect_offset abbrev_offset;
6399 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6402 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6404 const struct tu_abbrev_offset * const *a
6405 = (const struct tu_abbrev_offset * const*) ap;
6406 const struct tu_abbrev_offset * const *b
6407 = (const struct tu_abbrev_offset * const*) bp;
6408 sect_offset aoff = (*a)->abbrev_offset;
6409 sect_offset boff = (*b)->abbrev_offset;
6411 return (aoff > boff) - (aoff < boff);
6414 /* Efficiently read all the type units.
6415 This does the bulk of the work for build_type_psymtabs.
6417 The efficiency is because we sort TUs by the abbrev table they use and
6418 only read each abbrev table once. In one program there are 200K TUs
6419 sharing 8K abbrev tables.
6421 The main purpose of this function is to support building the
6422 dwarf2_per_objfile->type_unit_groups table.
6423 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
6424 can collapse the search space by grouping them by stmt_list.
6425 The savings can be significant, in the same program from above the 200K TUs
6426 share 8K stmt_list tables.
6428 FUNC is expected to call get_type_unit_group, which will create the
6429 struct type_unit_group if necessary and add it to
6430 dwarf2_per_objfile->type_unit_groups. */
6433 build_type_psymtabs_1 (void)
6435 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6436 struct cleanup *cleanups;
6437 struct abbrev_table *abbrev_table;
6438 sect_offset abbrev_offset;
6439 struct tu_abbrev_offset *sorted_by_abbrev;
6442 /* It's up to the caller to not call us multiple times. */
6443 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
6445 if (dwarf2_per_objfile->n_type_units == 0)
6448 /* TUs typically share abbrev tables, and there can be way more TUs than
6449 abbrev tables. Sort by abbrev table to reduce the number of times we
6450 read each abbrev table in.
6451 Alternatives are to punt or to maintain a cache of abbrev tables.
6452 This is simpler and efficient enough for now.
6454 Later we group TUs by their DW_AT_stmt_list value (as this defines the
6455 symtab to use). Typically TUs with the same abbrev offset have the same
6456 stmt_list value too so in practice this should work well.
6458 The basic algorithm here is:
6460 sort TUs by abbrev table
6461 for each TU with same abbrev table:
6462 read abbrev table if first user
6463 read TU top level DIE
6464 [IWBN if DWO skeletons had DW_AT_stmt_list]
6467 if (dwarf_read_debug)
6468 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
6470 /* Sort in a separate table to maintain the order of all_type_units
6471 for .gdb_index: TU indices directly index all_type_units. */
6472 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
6473 dwarf2_per_objfile->n_type_units);
6474 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6476 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
6478 sorted_by_abbrev[i].sig_type = sig_type;
6479 sorted_by_abbrev[i].abbrev_offset =
6480 read_abbrev_offset (sig_type->per_cu.section,
6481 sig_type->per_cu.sect_off);
6483 cleanups = make_cleanup (xfree, sorted_by_abbrev);
6484 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
6485 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
6487 abbrev_offset = (sect_offset) ~(unsigned) 0;
6488 abbrev_table = NULL;
6489 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
6491 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6493 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
6495 /* Switch to the next abbrev table if necessary. */
6496 if (abbrev_table == NULL
6497 || tu->abbrev_offset != abbrev_offset)
6499 if (abbrev_table != NULL)
6501 abbrev_table_free (abbrev_table);
6502 /* Reset to NULL in case abbrev_table_read_table throws
6503 an error: abbrev_table_free_cleanup will get called. */
6504 abbrev_table = NULL;
6506 abbrev_offset = tu->abbrev_offset;
6508 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
6510 ++tu_stats->nr_uniq_abbrev_tables;
6513 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
6514 build_type_psymtabs_reader, NULL);
6517 do_cleanups (cleanups);
6520 /* Print collected type unit statistics. */
6523 print_tu_stats (void)
6525 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6527 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
6528 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
6529 dwarf2_per_objfile->n_type_units);
6530 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
6531 tu_stats->nr_uniq_abbrev_tables);
6532 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
6533 tu_stats->nr_symtabs);
6534 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
6535 tu_stats->nr_symtab_sharers);
6536 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
6537 tu_stats->nr_stmt_less_type_units);
6538 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
6539 tu_stats->nr_all_type_units_reallocs);
6542 /* Traversal function for build_type_psymtabs. */
6545 build_type_psymtab_dependencies (void **slot, void *info)
6547 struct objfile *objfile = dwarf2_per_objfile->objfile;
6548 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6549 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6550 struct partial_symtab *pst = per_cu->v.psymtab;
6551 int len = VEC_length (sig_type_ptr, tu_group->tus);
6552 struct signatured_type *iter;
6555 gdb_assert (len > 0);
6556 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6558 pst->number_of_dependencies = len;
6560 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6562 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6565 gdb_assert (iter->per_cu.is_debug_types);
6566 pst->dependencies[i] = iter->per_cu.v.psymtab;
6567 iter->type_unit_group = tu_group;
6570 VEC_free (sig_type_ptr, tu_group->tus);
6575 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6576 Build partial symbol tables for the .debug_types comp-units. */
6579 build_type_psymtabs (struct objfile *objfile)
6581 if (! create_all_type_units (objfile))
6584 build_type_psymtabs_1 ();
6587 /* Traversal function for process_skeletonless_type_unit.
6588 Read a TU in a DWO file and build partial symbols for it. */
6591 process_skeletonless_type_unit (void **slot, void *info)
6593 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
6594 struct objfile *objfile = (struct objfile *) info;
6595 struct signatured_type find_entry, *entry;
6597 /* If this TU doesn't exist in the global table, add it and read it in. */
6599 if (dwarf2_per_objfile->signatured_types == NULL)
6601 dwarf2_per_objfile->signatured_types
6602 = allocate_signatured_type_table (objfile);
6605 find_entry.signature = dwo_unit->signature;
6606 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
6608 /* If we've already seen this type there's nothing to do. What's happening
6609 is we're doing our own version of comdat-folding here. */
6613 /* This does the job that create_all_type_units would have done for
6615 entry = add_type_unit (dwo_unit->signature, slot);
6616 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
6619 /* This does the job that build_type_psymtabs_1 would have done. */
6620 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
6621 build_type_psymtabs_reader, NULL);
6626 /* Traversal function for process_skeletonless_type_units. */
6629 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
6631 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
6633 if (dwo_file->tus != NULL)
6635 htab_traverse_noresize (dwo_file->tus,
6636 process_skeletonless_type_unit, info);
6642 /* Scan all TUs of DWO files, verifying we've processed them.
6643 This is needed in case a TU was emitted without its skeleton.
6644 Note: This can't be done until we know what all the DWO files are. */
6647 process_skeletonless_type_units (struct objfile *objfile)
6649 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
6650 if (get_dwp_file () == NULL
6651 && dwarf2_per_objfile->dwo_files != NULL)
6653 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
6654 process_dwo_file_for_skeletonless_type_units,
6659 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6662 psymtabs_addrmap_cleanup (void *o)
6664 struct objfile *objfile = (struct objfile *) o;
6666 objfile->psymtabs_addrmap = NULL;
6669 /* Compute the 'user' field for each psymtab in OBJFILE. */
6672 set_partial_user (struct objfile *objfile)
6676 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6678 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6679 struct partial_symtab *pst = per_cu->v.psymtab;
6685 for (j = 0; j < pst->number_of_dependencies; ++j)
6687 /* Set the 'user' field only if it is not already set. */
6688 if (pst->dependencies[j]->user == NULL)
6689 pst->dependencies[j]->user = pst;
6694 /* Build the partial symbol table by doing a quick pass through the
6695 .debug_info and .debug_abbrev sections. */
6698 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6700 struct cleanup *back_to, *addrmap_cleanup;
6703 if (dwarf_read_debug)
6705 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6706 objfile_name (objfile));
6709 dwarf2_per_objfile->reading_partial_symbols = 1;
6711 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6713 /* Any cached compilation units will be linked by the per-objfile
6714 read_in_chain. Make sure to free them when we're done. */
6715 back_to = make_cleanup (free_cached_comp_units, NULL);
6717 build_type_psymtabs (objfile);
6719 create_all_comp_units (objfile);
6721 /* Create a temporary address map on a temporary obstack. We later
6722 copy this to the final obstack. */
6723 auto_obstack temp_obstack;
6724 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6725 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6727 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6729 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6731 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6734 /* This has to wait until we read the CUs, we need the list of DWOs. */
6735 process_skeletonless_type_units (objfile);
6737 /* Now that all TUs have been processed we can fill in the dependencies. */
6738 if (dwarf2_per_objfile->type_unit_groups != NULL)
6740 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6741 build_type_psymtab_dependencies, NULL);
6744 if (dwarf_read_debug)
6747 set_partial_user (objfile);
6749 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6750 &objfile->objfile_obstack);
6751 discard_cleanups (addrmap_cleanup);
6753 do_cleanups (back_to);
6755 if (dwarf_read_debug)
6756 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6757 objfile_name (objfile));
6760 /* die_reader_func for load_partial_comp_unit. */
6763 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6764 const gdb_byte *info_ptr,
6765 struct die_info *comp_unit_die,
6769 struct dwarf2_cu *cu = reader->cu;
6771 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6773 /* Check if comp unit has_children.
6774 If so, read the rest of the partial symbols from this comp unit.
6775 If not, there's no more debug_info for this comp unit. */
6777 load_partial_dies (reader, info_ptr, 0);
6780 /* Load the partial DIEs for a secondary CU into memory.
6781 This is also used when rereading a primary CU with load_all_dies. */
6784 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6786 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6787 load_partial_comp_unit_reader, NULL);
6791 read_comp_units_from_section (struct objfile *objfile,
6792 struct dwarf2_section_info *section,
6793 struct dwarf2_section_info *abbrev_section,
6794 unsigned int is_dwz,
6797 struct dwarf2_per_cu_data ***all_comp_units)
6799 const gdb_byte *info_ptr;
6800 bfd *abfd = get_section_bfd_owner (section);
6802 if (dwarf_read_debug)
6803 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6804 get_section_name (section),
6805 get_section_file_name (section));
6807 dwarf2_read_section (objfile, section);
6809 info_ptr = section->buffer;
6811 while (info_ptr < section->buffer + section->size)
6813 struct dwarf2_per_cu_data *this_cu;
6815 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
6817 comp_unit_head cu_header;
6818 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
6819 info_ptr, rcuh_kind::COMPILE);
6821 /* Save the compilation unit for later lookup. */
6822 if (cu_header.unit_type != DW_UT_type)
6824 this_cu = XOBNEW (&objfile->objfile_obstack,
6825 struct dwarf2_per_cu_data);
6826 memset (this_cu, 0, sizeof (*this_cu));
6830 auto sig_type = XOBNEW (&objfile->objfile_obstack,
6831 struct signatured_type);
6832 memset (sig_type, 0, sizeof (*sig_type));
6833 sig_type->signature = cu_header.signature;
6834 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
6835 this_cu = &sig_type->per_cu;
6837 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
6838 this_cu->sect_off = sect_off;
6839 this_cu->length = cu_header.length + cu_header.initial_length_size;
6840 this_cu->is_dwz = is_dwz;
6841 this_cu->objfile = objfile;
6842 this_cu->section = section;
6844 if (*n_comp_units == *n_allocated)
6847 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
6848 *all_comp_units, *n_allocated);
6850 (*all_comp_units)[*n_comp_units] = this_cu;
6853 info_ptr = info_ptr + this_cu->length;
6857 /* Create a list of all compilation units in OBJFILE.
6858 This is only done for -readnow and building partial symtabs. */
6861 create_all_comp_units (struct objfile *objfile)
6865 struct dwarf2_per_cu_data **all_comp_units;
6866 struct dwz_file *dwz;
6870 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
6872 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info,
6873 &dwarf2_per_objfile->abbrev, 0,
6874 &n_allocated, &n_comp_units, &all_comp_units);
6876 dwz = dwarf2_get_dwz_file ();
6878 read_comp_units_from_section (objfile, &dwz->info, &dwz->abbrev, 1,
6879 &n_allocated, &n_comp_units,
6882 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
6883 struct dwarf2_per_cu_data *,
6885 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6886 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6887 xfree (all_comp_units);
6888 dwarf2_per_objfile->n_comp_units = n_comp_units;
6891 /* Process all loaded DIEs for compilation unit CU, starting at
6892 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
6893 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6894 DW_AT_ranges). See the comments of add_partial_subprogram on how
6895 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
6898 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6899 CORE_ADDR *highpc, int set_addrmap,
6900 struct dwarf2_cu *cu)
6902 struct partial_die_info *pdi;
6904 /* Now, march along the PDI's, descending into ones which have
6905 interesting children but skipping the children of the other ones,
6906 until we reach the end of the compilation unit. */
6912 fixup_partial_die (pdi, cu);
6914 /* Anonymous namespaces or modules have no name but have interesting
6915 children, so we need to look at them. Ditto for anonymous
6918 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6919 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6920 || pdi->tag == DW_TAG_imported_unit)
6924 case DW_TAG_subprogram:
6925 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
6927 case DW_TAG_constant:
6928 case DW_TAG_variable:
6929 case DW_TAG_typedef:
6930 case DW_TAG_union_type:
6931 if (!pdi->is_declaration)
6933 add_partial_symbol (pdi, cu);
6936 case DW_TAG_class_type:
6937 case DW_TAG_interface_type:
6938 case DW_TAG_structure_type:
6939 if (!pdi->is_declaration)
6941 add_partial_symbol (pdi, cu);
6943 if (cu->language == language_rust && pdi->has_children)
6944 scan_partial_symbols (pdi->die_child, lowpc, highpc,
6947 case DW_TAG_enumeration_type:
6948 if (!pdi->is_declaration)
6949 add_partial_enumeration (pdi, cu);
6951 case DW_TAG_base_type:
6952 case DW_TAG_subrange_type:
6953 /* File scope base type definitions are added to the partial
6955 add_partial_symbol (pdi, cu);
6957 case DW_TAG_namespace:
6958 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
6961 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
6963 case DW_TAG_imported_unit:
6965 struct dwarf2_per_cu_data *per_cu;
6967 /* For now we don't handle imported units in type units. */
6968 if (cu->per_cu->is_debug_types)
6970 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6971 " supported in type units [in module %s]"),
6972 objfile_name (cu->objfile));
6975 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
6979 /* Go read the partial unit, if needed. */
6980 if (per_cu->v.psymtab == NULL)
6981 process_psymtab_comp_unit (per_cu, 1, cu->language);
6983 VEC_safe_push (dwarf2_per_cu_ptr,
6984 cu->per_cu->imported_symtabs, per_cu);
6987 case DW_TAG_imported_declaration:
6988 add_partial_symbol (pdi, cu);
6995 /* If the die has a sibling, skip to the sibling. */
6997 pdi = pdi->die_sibling;
7001 /* Functions used to compute the fully scoped name of a partial DIE.
7003 Normally, this is simple. For C++, the parent DIE's fully scoped
7004 name is concatenated with "::" and the partial DIE's name.
7005 Enumerators are an exception; they use the scope of their parent
7006 enumeration type, i.e. the name of the enumeration type is not
7007 prepended to the enumerator.
7009 There are two complexities. One is DW_AT_specification; in this
7010 case "parent" means the parent of the target of the specification,
7011 instead of the direct parent of the DIE. The other is compilers
7012 which do not emit DW_TAG_namespace; in this case we try to guess
7013 the fully qualified name of structure types from their members'
7014 linkage names. This must be done using the DIE's children rather
7015 than the children of any DW_AT_specification target. We only need
7016 to do this for structures at the top level, i.e. if the target of
7017 any DW_AT_specification (if any; otherwise the DIE itself) does not
7020 /* Compute the scope prefix associated with PDI's parent, in
7021 compilation unit CU. The result will be allocated on CU's
7022 comp_unit_obstack, or a copy of the already allocated PDI->NAME
7023 field. NULL is returned if no prefix is necessary. */
7025 partial_die_parent_scope (struct partial_die_info *pdi,
7026 struct dwarf2_cu *cu)
7028 const char *grandparent_scope;
7029 struct partial_die_info *parent, *real_pdi;
7031 /* We need to look at our parent DIE; if we have a DW_AT_specification,
7032 then this means the parent of the specification DIE. */
7035 while (real_pdi->has_specification)
7036 real_pdi = find_partial_die (real_pdi->spec_offset,
7037 real_pdi->spec_is_dwz, cu);
7039 parent = real_pdi->die_parent;
7043 if (parent->scope_set)
7044 return parent->scope;
7046 fixup_partial_die (parent, cu);
7048 grandparent_scope = partial_die_parent_scope (parent, cu);
7050 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
7051 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
7052 Work around this problem here. */
7053 if (cu->language == language_cplus
7054 && parent->tag == DW_TAG_namespace
7055 && strcmp (parent->name, "::") == 0
7056 && grandparent_scope == NULL)
7058 parent->scope = NULL;
7059 parent->scope_set = 1;
7063 if (pdi->tag == DW_TAG_enumerator)
7064 /* Enumerators should not get the name of the enumeration as a prefix. */
7065 parent->scope = grandparent_scope;
7066 else if (parent->tag == DW_TAG_namespace
7067 || parent->tag == DW_TAG_module
7068 || parent->tag == DW_TAG_structure_type
7069 || parent->tag == DW_TAG_class_type
7070 || parent->tag == DW_TAG_interface_type
7071 || parent->tag == DW_TAG_union_type
7072 || parent->tag == DW_TAG_enumeration_type)
7074 if (grandparent_scope == NULL)
7075 parent->scope = parent->name;
7077 parent->scope = typename_concat (&cu->comp_unit_obstack,
7079 parent->name, 0, cu);
7083 /* FIXME drow/2004-04-01: What should we be doing with
7084 function-local names? For partial symbols, we should probably be
7086 complaint (&symfile_complaints,
7087 _("unhandled containing DIE tag %d for DIE at %d"),
7088 parent->tag, to_underlying (pdi->sect_off));
7089 parent->scope = grandparent_scope;
7092 parent->scope_set = 1;
7093 return parent->scope;
7096 /* Return the fully scoped name associated with PDI, from compilation unit
7097 CU. The result will be allocated with malloc. */
7100 partial_die_full_name (struct partial_die_info *pdi,
7101 struct dwarf2_cu *cu)
7103 const char *parent_scope;
7105 /* If this is a template instantiation, we can not work out the
7106 template arguments from partial DIEs. So, unfortunately, we have
7107 to go through the full DIEs. At least any work we do building
7108 types here will be reused if full symbols are loaded later. */
7109 if (pdi->has_template_arguments)
7111 fixup_partial_die (pdi, cu);
7113 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7115 struct die_info *die;
7116 struct attribute attr;
7117 struct dwarf2_cu *ref_cu = cu;
7119 /* DW_FORM_ref_addr is using section offset. */
7120 attr.name = (enum dwarf_attribute) 0;
7121 attr.form = DW_FORM_ref_addr;
7122 attr.u.unsnd = to_underlying (pdi->sect_off);
7123 die = follow_die_ref (NULL, &attr, &ref_cu);
7125 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7129 parent_scope = partial_die_parent_scope (pdi, cu);
7130 if (parent_scope == NULL)
7133 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7137 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7139 struct objfile *objfile = cu->objfile;
7140 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7142 const char *actual_name = NULL;
7144 char *built_actual_name;
7146 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7148 built_actual_name = partial_die_full_name (pdi, cu);
7149 if (built_actual_name != NULL)
7150 actual_name = built_actual_name;
7152 if (actual_name == NULL)
7153 actual_name = pdi->name;
7157 case DW_TAG_subprogram:
7158 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
7159 if (pdi->is_external || cu->language == language_ada)
7161 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
7162 of the global scope. But in Ada, we want to be able to access
7163 nested procedures globally. So all Ada subprograms are stored
7164 in the global scope. */
7165 add_psymbol_to_list (actual_name, strlen (actual_name),
7166 built_actual_name != NULL,
7167 VAR_DOMAIN, LOC_BLOCK,
7168 &objfile->global_psymbols,
7169 addr, cu->language, objfile);
7173 add_psymbol_to_list (actual_name, strlen (actual_name),
7174 built_actual_name != NULL,
7175 VAR_DOMAIN, LOC_BLOCK,
7176 &objfile->static_psymbols,
7177 addr, cu->language, objfile);
7180 if (pdi->main_subprogram && actual_name != NULL)
7181 set_objfile_main_name (objfile, actual_name, cu->language);
7183 case DW_TAG_constant:
7185 struct psymbol_allocation_list *list;
7187 if (pdi->is_external)
7188 list = &objfile->global_psymbols;
7190 list = &objfile->static_psymbols;
7191 add_psymbol_to_list (actual_name, strlen (actual_name),
7192 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
7193 list, 0, cu->language, objfile);
7196 case DW_TAG_variable:
7198 addr = decode_locdesc (pdi->d.locdesc, cu);
7202 && !dwarf2_per_objfile->has_section_at_zero)
7204 /* A global or static variable may also have been stripped
7205 out by the linker if unused, in which case its address
7206 will be nullified; do not add such variables into partial
7207 symbol table then. */
7209 else if (pdi->is_external)
7212 Don't enter into the minimal symbol tables as there is
7213 a minimal symbol table entry from the ELF symbols already.
7214 Enter into partial symbol table if it has a location
7215 descriptor or a type.
7216 If the location descriptor is missing, new_symbol will create
7217 a LOC_UNRESOLVED symbol, the address of the variable will then
7218 be determined from the minimal symbol table whenever the variable
7220 The address for the partial symbol table entry is not
7221 used by GDB, but it comes in handy for debugging partial symbol
7224 if (pdi->d.locdesc || pdi->has_type)
7225 add_psymbol_to_list (actual_name, strlen (actual_name),
7226 built_actual_name != NULL,
7227 VAR_DOMAIN, LOC_STATIC,
7228 &objfile->global_psymbols,
7230 cu->language, objfile);
7234 int has_loc = pdi->d.locdesc != NULL;
7236 /* Static Variable. Skip symbols whose value we cannot know (those
7237 without location descriptors or constant values). */
7238 if (!has_loc && !pdi->has_const_value)
7240 xfree (built_actual_name);
7244 add_psymbol_to_list (actual_name, strlen (actual_name),
7245 built_actual_name != NULL,
7246 VAR_DOMAIN, LOC_STATIC,
7247 &objfile->static_psymbols,
7248 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7249 cu->language, objfile);
7252 case DW_TAG_typedef:
7253 case DW_TAG_base_type:
7254 case DW_TAG_subrange_type:
7255 add_psymbol_to_list (actual_name, strlen (actual_name),
7256 built_actual_name != NULL,
7257 VAR_DOMAIN, LOC_TYPEDEF,
7258 &objfile->static_psymbols,
7259 0, cu->language, objfile);
7261 case DW_TAG_imported_declaration:
7262 case DW_TAG_namespace:
7263 add_psymbol_to_list (actual_name, strlen (actual_name),
7264 built_actual_name != NULL,
7265 VAR_DOMAIN, LOC_TYPEDEF,
7266 &objfile->global_psymbols,
7267 0, cu->language, objfile);
7270 add_psymbol_to_list (actual_name, strlen (actual_name),
7271 built_actual_name != NULL,
7272 MODULE_DOMAIN, LOC_TYPEDEF,
7273 &objfile->global_psymbols,
7274 0, cu->language, objfile);
7276 case DW_TAG_class_type:
7277 case DW_TAG_interface_type:
7278 case DW_TAG_structure_type:
7279 case DW_TAG_union_type:
7280 case DW_TAG_enumeration_type:
7281 /* Skip external references. The DWARF standard says in the section
7282 about "Structure, Union, and Class Type Entries": "An incomplete
7283 structure, union or class type is represented by a structure,
7284 union or class entry that does not have a byte size attribute
7285 and that has a DW_AT_declaration attribute." */
7286 if (!pdi->has_byte_size && pdi->is_declaration)
7288 xfree (built_actual_name);
7292 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7293 static vs. global. */
7294 add_psymbol_to_list (actual_name, strlen (actual_name),
7295 built_actual_name != NULL,
7296 STRUCT_DOMAIN, LOC_TYPEDEF,
7297 cu->language == language_cplus
7298 ? &objfile->global_psymbols
7299 : &objfile->static_psymbols,
7300 0, cu->language, objfile);
7303 case DW_TAG_enumerator:
7304 add_psymbol_to_list (actual_name, strlen (actual_name),
7305 built_actual_name != NULL,
7306 VAR_DOMAIN, LOC_CONST,
7307 cu->language == language_cplus
7308 ? &objfile->global_psymbols
7309 : &objfile->static_psymbols,
7310 0, cu->language, objfile);
7316 xfree (built_actual_name);
7319 /* Read a partial die corresponding to a namespace; also, add a symbol
7320 corresponding to that namespace to the symbol table. NAMESPACE is
7321 the name of the enclosing namespace. */
7324 add_partial_namespace (struct partial_die_info *pdi,
7325 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7326 int set_addrmap, struct dwarf2_cu *cu)
7328 /* Add a symbol for the namespace. */
7330 add_partial_symbol (pdi, cu);
7332 /* Now scan partial symbols in that namespace. */
7334 if (pdi->has_children)
7335 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7338 /* Read a partial die corresponding to a Fortran module. */
7341 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7342 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7344 /* Add a symbol for the namespace. */
7346 add_partial_symbol (pdi, cu);
7348 /* Now scan partial symbols in that module. */
7350 if (pdi->has_children)
7351 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7354 /* Read a partial die corresponding to a subprogram and create a partial
7355 symbol for that subprogram. When the CU language allows it, this
7356 routine also defines a partial symbol for each nested subprogram
7357 that this subprogram contains. If SET_ADDRMAP is true, record the
7358 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7359 and highest PC values found in PDI.
7361 PDI may also be a lexical block, in which case we simply search
7362 recursively for subprograms defined inside that lexical block.
7363 Again, this is only performed when the CU language allows this
7364 type of definitions. */
7367 add_partial_subprogram (struct partial_die_info *pdi,
7368 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7369 int set_addrmap, struct dwarf2_cu *cu)
7371 if (pdi->tag == DW_TAG_subprogram)
7373 if (pdi->has_pc_info)
7375 if (pdi->lowpc < *lowpc)
7376 *lowpc = pdi->lowpc;
7377 if (pdi->highpc > *highpc)
7378 *highpc = pdi->highpc;
7381 struct objfile *objfile = cu->objfile;
7382 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7387 baseaddr = ANOFFSET (objfile->section_offsets,
7388 SECT_OFF_TEXT (objfile));
7389 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7390 pdi->lowpc + baseaddr);
7391 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7392 pdi->highpc + baseaddr);
7393 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7394 cu->per_cu->v.psymtab);
7398 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7400 if (!pdi->is_declaration)
7401 /* Ignore subprogram DIEs that do not have a name, they are
7402 illegal. Do not emit a complaint at this point, we will
7403 do so when we convert this psymtab into a symtab. */
7405 add_partial_symbol (pdi, cu);
7409 if (! pdi->has_children)
7412 if (cu->language == language_ada)
7414 pdi = pdi->die_child;
7417 fixup_partial_die (pdi, cu);
7418 if (pdi->tag == DW_TAG_subprogram
7419 || pdi->tag == DW_TAG_lexical_block)
7420 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7421 pdi = pdi->die_sibling;
7426 /* Read a partial die corresponding to an enumeration type. */
7429 add_partial_enumeration (struct partial_die_info *enum_pdi,
7430 struct dwarf2_cu *cu)
7432 struct partial_die_info *pdi;
7434 if (enum_pdi->name != NULL)
7435 add_partial_symbol (enum_pdi, cu);
7437 pdi = enum_pdi->die_child;
7440 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7441 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7443 add_partial_symbol (pdi, cu);
7444 pdi = pdi->die_sibling;
7448 /* Return the initial uleb128 in the die at INFO_PTR. */
7451 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7453 unsigned int bytes_read;
7455 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7458 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7459 Return the corresponding abbrev, or NULL if the number is zero (indicating
7460 an empty DIE). In either case *BYTES_READ will be set to the length of
7461 the initial number. */
7463 static struct abbrev_info *
7464 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7465 struct dwarf2_cu *cu)
7467 bfd *abfd = cu->objfile->obfd;
7468 unsigned int abbrev_number;
7469 struct abbrev_info *abbrev;
7471 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7473 if (abbrev_number == 0)
7476 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7479 error (_("Dwarf Error: Could not find abbrev number %d in %s"
7480 " at offset 0x%x [in module %s]"),
7481 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
7482 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
7488 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7489 Returns a pointer to the end of a series of DIEs, terminated by an empty
7490 DIE. Any children of the skipped DIEs will also be skipped. */
7492 static const gdb_byte *
7493 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7495 struct dwarf2_cu *cu = reader->cu;
7496 struct abbrev_info *abbrev;
7497 unsigned int bytes_read;
7501 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7503 return info_ptr + bytes_read;
7505 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7509 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7510 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7511 abbrev corresponding to that skipped uleb128 should be passed in
7512 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7515 static const gdb_byte *
7516 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7517 struct abbrev_info *abbrev)
7519 unsigned int bytes_read;
7520 struct attribute attr;
7521 bfd *abfd = reader->abfd;
7522 struct dwarf2_cu *cu = reader->cu;
7523 const gdb_byte *buffer = reader->buffer;
7524 const gdb_byte *buffer_end = reader->buffer_end;
7525 unsigned int form, i;
7527 for (i = 0; i < abbrev->num_attrs; i++)
7529 /* The only abbrev we care about is DW_AT_sibling. */
7530 if (abbrev->attrs[i].name == DW_AT_sibling)
7532 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7533 if (attr.form == DW_FORM_ref_addr)
7534 complaint (&symfile_complaints,
7535 _("ignoring absolute DW_AT_sibling"));
7538 sect_offset off = dwarf2_get_ref_die_offset (&attr);
7539 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
7541 if (sibling_ptr < info_ptr)
7542 complaint (&symfile_complaints,
7543 _("DW_AT_sibling points backwards"));
7544 else if (sibling_ptr > reader->buffer_end)
7545 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7551 /* If it isn't DW_AT_sibling, skip this attribute. */
7552 form = abbrev->attrs[i].form;
7556 case DW_FORM_ref_addr:
7557 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7558 and later it is offset sized. */
7559 if (cu->header.version == 2)
7560 info_ptr += cu->header.addr_size;
7562 info_ptr += cu->header.offset_size;
7564 case DW_FORM_GNU_ref_alt:
7565 info_ptr += cu->header.offset_size;
7568 info_ptr += cu->header.addr_size;
7575 case DW_FORM_flag_present:
7576 case DW_FORM_implicit_const:
7588 case DW_FORM_ref_sig8:
7591 case DW_FORM_data16:
7594 case DW_FORM_string:
7595 read_direct_string (abfd, info_ptr, &bytes_read);
7596 info_ptr += bytes_read;
7598 case DW_FORM_sec_offset:
7600 case DW_FORM_GNU_strp_alt:
7601 info_ptr += cu->header.offset_size;
7603 case DW_FORM_exprloc:
7605 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7606 info_ptr += bytes_read;
7608 case DW_FORM_block1:
7609 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7611 case DW_FORM_block2:
7612 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7614 case DW_FORM_block4:
7615 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7619 case DW_FORM_ref_udata:
7620 case DW_FORM_GNU_addr_index:
7621 case DW_FORM_GNU_str_index:
7622 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7624 case DW_FORM_indirect:
7625 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7626 info_ptr += bytes_read;
7627 /* We need to continue parsing from here, so just go back to
7629 goto skip_attribute;
7632 error (_("Dwarf Error: Cannot handle %s "
7633 "in DWARF reader [in module %s]"),
7634 dwarf_form_name (form),
7635 bfd_get_filename (abfd));
7639 if (abbrev->has_children)
7640 return skip_children (reader, info_ptr);
7645 /* Locate ORIG_PDI's sibling.
7646 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7648 static const gdb_byte *
7649 locate_pdi_sibling (const struct die_reader_specs *reader,
7650 struct partial_die_info *orig_pdi,
7651 const gdb_byte *info_ptr)
7653 /* Do we know the sibling already? */
7655 if (orig_pdi->sibling)
7656 return orig_pdi->sibling;
7658 /* Are there any children to deal with? */
7660 if (!orig_pdi->has_children)
7663 /* Skip the children the long way. */
7665 return skip_children (reader, info_ptr);
7668 /* Expand this partial symbol table into a full symbol table. SELF is
7672 dwarf2_read_symtab (struct partial_symtab *self,
7673 struct objfile *objfile)
7677 warning (_("bug: psymtab for %s is already read in."),
7684 printf_filtered (_("Reading in symbols for %s..."),
7686 gdb_flush (gdb_stdout);
7689 /* Restore our global data. */
7691 = (struct dwarf2_per_objfile *) objfile_data (objfile,
7692 dwarf2_objfile_data_key);
7694 /* If this psymtab is constructed from a debug-only objfile, the
7695 has_section_at_zero flag will not necessarily be correct. We
7696 can get the correct value for this flag by looking at the data
7697 associated with the (presumably stripped) associated objfile. */
7698 if (objfile->separate_debug_objfile_backlink)
7700 struct dwarf2_per_objfile *dpo_backlink
7701 = ((struct dwarf2_per_objfile *)
7702 objfile_data (objfile->separate_debug_objfile_backlink,
7703 dwarf2_objfile_data_key));
7705 dwarf2_per_objfile->has_section_at_zero
7706 = dpo_backlink->has_section_at_zero;
7709 dwarf2_per_objfile->reading_partial_symbols = 0;
7711 psymtab_to_symtab_1 (self);
7713 /* Finish up the debug error message. */
7715 printf_filtered (_("done.\n"));
7718 process_cu_includes ();
7721 /* Reading in full CUs. */
7723 /* Add PER_CU to the queue. */
7726 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7727 enum language pretend_language)
7729 struct dwarf2_queue_item *item;
7732 item = XNEW (struct dwarf2_queue_item);
7733 item->per_cu = per_cu;
7734 item->pretend_language = pretend_language;
7737 if (dwarf2_queue == NULL)
7738 dwarf2_queue = item;
7740 dwarf2_queue_tail->next = item;
7742 dwarf2_queue_tail = item;
7745 /* If PER_CU is not yet queued, add it to the queue.
7746 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7748 The result is non-zero if PER_CU was queued, otherwise the result is zero
7749 meaning either PER_CU is already queued or it is already loaded.
7751 N.B. There is an invariant here that if a CU is queued then it is loaded.
7752 The caller is required to load PER_CU if we return non-zero. */
7755 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7756 struct dwarf2_per_cu_data *per_cu,
7757 enum language pretend_language)
7759 /* We may arrive here during partial symbol reading, if we need full
7760 DIEs to process an unusual case (e.g. template arguments). Do
7761 not queue PER_CU, just tell our caller to load its DIEs. */
7762 if (dwarf2_per_objfile->reading_partial_symbols)
7764 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7769 /* Mark the dependence relation so that we don't flush PER_CU
7771 if (dependent_cu != NULL)
7772 dwarf2_add_dependence (dependent_cu, per_cu);
7774 /* If it's already on the queue, we have nothing to do. */
7778 /* If the compilation unit is already loaded, just mark it as
7780 if (per_cu->cu != NULL)
7782 per_cu->cu->last_used = 0;
7786 /* Add it to the queue. */
7787 queue_comp_unit (per_cu, pretend_language);
7792 /* Process the queue. */
7795 process_queue (void)
7797 struct dwarf2_queue_item *item, *next_item;
7799 if (dwarf_read_debug)
7801 fprintf_unfiltered (gdb_stdlog,
7802 "Expanding one or more symtabs of objfile %s ...\n",
7803 objfile_name (dwarf2_per_objfile->objfile));
7806 /* The queue starts out with one item, but following a DIE reference
7807 may load a new CU, adding it to the end of the queue. */
7808 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7810 if ((dwarf2_per_objfile->using_index
7811 ? !item->per_cu->v.quick->compunit_symtab
7812 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7813 /* Skip dummy CUs. */
7814 && item->per_cu->cu != NULL)
7816 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7817 unsigned int debug_print_threshold;
7820 if (per_cu->is_debug_types)
7822 struct signatured_type *sig_type =
7823 (struct signatured_type *) per_cu;
7825 sprintf (buf, "TU %s at offset 0x%x",
7826 hex_string (sig_type->signature),
7827 to_underlying (per_cu->sect_off));
7828 /* There can be 100s of TUs.
7829 Only print them in verbose mode. */
7830 debug_print_threshold = 2;
7834 sprintf (buf, "CU at offset 0x%x",
7835 to_underlying (per_cu->sect_off));
7836 debug_print_threshold = 1;
7839 if (dwarf_read_debug >= debug_print_threshold)
7840 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7842 if (per_cu->is_debug_types)
7843 process_full_type_unit (per_cu, item->pretend_language);
7845 process_full_comp_unit (per_cu, item->pretend_language);
7847 if (dwarf_read_debug >= debug_print_threshold)
7848 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7851 item->per_cu->queued = 0;
7852 next_item = item->next;
7856 dwarf2_queue_tail = NULL;
7858 if (dwarf_read_debug)
7860 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7861 objfile_name (dwarf2_per_objfile->objfile));
7865 /* Free all allocated queue entries. This function only releases anything if
7866 an error was thrown; if the queue was processed then it would have been
7867 freed as we went along. */
7870 dwarf2_release_queue (void *dummy)
7872 struct dwarf2_queue_item *item, *last;
7874 item = dwarf2_queue;
7877 /* Anything still marked queued is likely to be in an
7878 inconsistent state, so discard it. */
7879 if (item->per_cu->queued)
7881 if (item->per_cu->cu != NULL)
7882 free_one_cached_comp_unit (item->per_cu);
7883 item->per_cu->queued = 0;
7891 dwarf2_queue = dwarf2_queue_tail = NULL;
7894 /* Read in full symbols for PST, and anything it depends on. */
7897 psymtab_to_symtab_1 (struct partial_symtab *pst)
7899 struct dwarf2_per_cu_data *per_cu;
7905 for (i = 0; i < pst->number_of_dependencies; i++)
7906 if (!pst->dependencies[i]->readin
7907 && pst->dependencies[i]->user == NULL)
7909 /* Inform about additional files that need to be read in. */
7912 /* FIXME: i18n: Need to make this a single string. */
7913 fputs_filtered (" ", gdb_stdout);
7915 fputs_filtered ("and ", gdb_stdout);
7917 printf_filtered ("%s...", pst->dependencies[i]->filename);
7918 wrap_here (""); /* Flush output. */
7919 gdb_flush (gdb_stdout);
7921 psymtab_to_symtab_1 (pst->dependencies[i]);
7924 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
7928 /* It's an include file, no symbols to read for it.
7929 Everything is in the parent symtab. */
7934 dw2_do_instantiate_symtab (per_cu);
7937 /* Trivial hash function for die_info: the hash value of a DIE
7938 is its offset in .debug_info for this objfile. */
7941 die_hash (const void *item)
7943 const struct die_info *die = (const struct die_info *) item;
7945 return to_underlying (die->sect_off);
7948 /* Trivial comparison function for die_info structures: two DIEs
7949 are equal if they have the same offset. */
7952 die_eq (const void *item_lhs, const void *item_rhs)
7954 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
7955 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
7957 return die_lhs->sect_off == die_rhs->sect_off;
7960 /* die_reader_func for load_full_comp_unit.
7961 This is identical to read_signatured_type_reader,
7962 but is kept separate for now. */
7965 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7966 const gdb_byte *info_ptr,
7967 struct die_info *comp_unit_die,
7971 struct dwarf2_cu *cu = reader->cu;
7972 enum language *language_ptr = (enum language *) data;
7974 gdb_assert (cu->die_hash == NULL);
7976 htab_create_alloc_ex (cu->header.length / 12,
7980 &cu->comp_unit_obstack,
7981 hashtab_obstack_allocate,
7982 dummy_obstack_deallocate);
7985 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7986 &info_ptr, comp_unit_die);
7987 cu->dies = comp_unit_die;
7988 /* comp_unit_die is not stored in die_hash, no need. */
7990 /* We try not to read any attributes in this function, because not
7991 all CUs needed for references have been loaded yet, and symbol
7992 table processing isn't initialized. But we have to set the CU language,
7993 or we won't be able to build types correctly.
7994 Similarly, if we do not read the producer, we can not apply
7995 producer-specific interpretation. */
7996 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7999 /* Load the DIEs associated with PER_CU into memory. */
8002 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
8003 enum language pretend_language)
8005 gdb_assert (! this_cu->is_debug_types);
8007 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8008 load_full_comp_unit_reader, &pretend_language);
8011 /* Add a DIE to the delayed physname list. */
8014 add_to_method_list (struct type *type, int fnfield_index, int index,
8015 const char *name, struct die_info *die,
8016 struct dwarf2_cu *cu)
8018 struct delayed_method_info mi;
8020 mi.fnfield_index = fnfield_index;
8024 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
8027 /* A cleanup for freeing the delayed method list. */
8030 free_delayed_list (void *ptr)
8032 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
8033 if (cu->method_list != NULL)
8035 VEC_free (delayed_method_info, cu->method_list);
8036 cu->method_list = NULL;
8040 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
8041 "const" / "volatile". If so, decrements LEN by the length of the
8042 modifier and return true. Otherwise return false. */
8046 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
8048 size_t mod_len = sizeof (mod) - 1;
8049 if (len > mod_len && startswith (physname + (len - mod_len), mod))
8057 /* Compute the physnames of any methods on the CU's method list.
8059 The computation of method physnames is delayed in order to avoid the
8060 (bad) condition that one of the method's formal parameters is of an as yet
8064 compute_delayed_physnames (struct dwarf2_cu *cu)
8067 struct delayed_method_info *mi;
8069 /* Only C++ delays computing physnames. */
8070 if (VEC_empty (delayed_method_info, cu->method_list))
8072 gdb_assert (cu->language == language_cplus);
8074 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
8076 const char *physname;
8077 struct fn_fieldlist *fn_flp
8078 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
8079 physname = dwarf2_physname (mi->name, mi->die, cu);
8080 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
8081 = physname ? physname : "";
8083 /* Since there's no tag to indicate whether a method is a
8084 const/volatile overload, extract that information out of the
8086 if (physname != NULL)
8088 size_t len = strlen (physname);
8092 if (physname[len] == ')') /* shortcut */
8094 else if (check_modifier (physname, len, " const"))
8095 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi->index) = 1;
8096 else if (check_modifier (physname, len, " volatile"))
8097 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi->index) = 1;
8105 /* Go objects should be embedded in a DW_TAG_module DIE,
8106 and it's not clear if/how imported objects will appear.
8107 To keep Go support simple until that's worked out,
8108 go back through what we've read and create something usable.
8109 We could do this while processing each DIE, and feels kinda cleaner,
8110 but that way is more invasive.
8111 This is to, for example, allow the user to type "p var" or "b main"
8112 without having to specify the package name, and allow lookups
8113 of module.object to work in contexts that use the expression
8117 fixup_go_packaging (struct dwarf2_cu *cu)
8119 char *package_name = NULL;
8120 struct pending *list;
8123 for (list = global_symbols; list != NULL; list = list->next)
8125 for (i = 0; i < list->nsyms; ++i)
8127 struct symbol *sym = list->symbol[i];
8129 if (SYMBOL_LANGUAGE (sym) == language_go
8130 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8132 char *this_package_name = go_symbol_package_name (sym);
8134 if (this_package_name == NULL)
8136 if (package_name == NULL)
8137 package_name = this_package_name;
8140 if (strcmp (package_name, this_package_name) != 0)
8141 complaint (&symfile_complaints,
8142 _("Symtab %s has objects from two different Go packages: %s and %s"),
8143 (symbol_symtab (sym) != NULL
8144 ? symtab_to_filename_for_display
8145 (symbol_symtab (sym))
8146 : objfile_name (cu->objfile)),
8147 this_package_name, package_name);
8148 xfree (this_package_name);
8154 if (package_name != NULL)
8156 struct objfile *objfile = cu->objfile;
8157 const char *saved_package_name
8158 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
8160 strlen (package_name));
8161 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
8162 saved_package_name);
8165 TYPE_TAG_NAME (type) = TYPE_NAME (type);
8167 sym = allocate_symbol (objfile);
8168 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
8169 SYMBOL_SET_NAMES (sym, saved_package_name,
8170 strlen (saved_package_name), 0, objfile);
8171 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
8172 e.g., "main" finds the "main" module and not C's main(). */
8173 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
8174 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
8175 SYMBOL_TYPE (sym) = type;
8177 add_symbol_to_list (sym, &global_symbols);
8179 xfree (package_name);
8183 /* Return the symtab for PER_CU. This works properly regardless of
8184 whether we're using the index or psymtabs. */
8186 static struct compunit_symtab *
8187 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
8189 return (dwarf2_per_objfile->using_index
8190 ? per_cu->v.quick->compunit_symtab
8191 : per_cu->v.psymtab->compunit_symtab);
8194 /* A helper function for computing the list of all symbol tables
8195 included by PER_CU. */
8198 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
8199 htab_t all_children, htab_t all_type_symtabs,
8200 struct dwarf2_per_cu_data *per_cu,
8201 struct compunit_symtab *immediate_parent)
8205 struct compunit_symtab *cust;
8206 struct dwarf2_per_cu_data *iter;
8208 slot = htab_find_slot (all_children, per_cu, INSERT);
8211 /* This inclusion and its children have been processed. */
8216 /* Only add a CU if it has a symbol table. */
8217 cust = get_compunit_symtab (per_cu);
8220 /* If this is a type unit only add its symbol table if we haven't
8221 seen it yet (type unit per_cu's can share symtabs). */
8222 if (per_cu->is_debug_types)
8224 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
8228 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8229 if (cust->user == NULL)
8230 cust->user = immediate_parent;
8235 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8236 if (cust->user == NULL)
8237 cust->user = immediate_parent;
8242 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
8245 recursively_compute_inclusions (result, all_children,
8246 all_type_symtabs, iter, cust);
8250 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
8254 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
8256 gdb_assert (! per_cu->is_debug_types);
8258 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
8261 struct dwarf2_per_cu_data *per_cu_iter;
8262 struct compunit_symtab *compunit_symtab_iter;
8263 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
8264 htab_t all_children, all_type_symtabs;
8265 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
8267 /* If we don't have a symtab, we can just skip this case. */
8271 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8272 NULL, xcalloc, xfree);
8273 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8274 NULL, xcalloc, xfree);
8277 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
8281 recursively_compute_inclusions (&result_symtabs, all_children,
8282 all_type_symtabs, per_cu_iter,
8286 /* Now we have a transitive closure of all the included symtabs. */
8287 len = VEC_length (compunit_symtab_ptr, result_symtabs);
8289 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
8290 struct compunit_symtab *, len + 1);
8292 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
8293 compunit_symtab_iter);
8295 cust->includes[ix] = compunit_symtab_iter;
8296 cust->includes[len] = NULL;
8298 VEC_free (compunit_symtab_ptr, result_symtabs);
8299 htab_delete (all_children);
8300 htab_delete (all_type_symtabs);
8304 /* Compute the 'includes' field for the symtabs of all the CUs we just
8308 process_cu_includes (void)
8311 struct dwarf2_per_cu_data *iter;
8314 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8318 if (! iter->is_debug_types)
8319 compute_compunit_symtab_includes (iter);
8322 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8325 /* Generate full symbol information for PER_CU, whose DIEs have
8326 already been loaded into memory. */
8329 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8330 enum language pretend_language)
8332 struct dwarf2_cu *cu = per_cu->cu;
8333 struct objfile *objfile = per_cu->objfile;
8334 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8335 CORE_ADDR lowpc, highpc;
8336 struct compunit_symtab *cust;
8337 struct cleanup *back_to, *delayed_list_cleanup;
8339 struct block *static_block;
8342 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8345 back_to = make_cleanup (really_free_pendings, NULL);
8346 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8348 cu->list_in_scope = &file_symbols;
8350 cu->language = pretend_language;
8351 cu->language_defn = language_def (cu->language);
8353 /* Do line number decoding in read_file_scope () */
8354 process_die (cu->dies, cu);
8356 /* For now fudge the Go package. */
8357 if (cu->language == language_go)
8358 fixup_go_packaging (cu);
8360 /* Now that we have processed all the DIEs in the CU, all the types
8361 should be complete, and it should now be safe to compute all of the
8363 compute_delayed_physnames (cu);
8364 do_cleanups (delayed_list_cleanup);
8366 /* Some compilers don't define a DW_AT_high_pc attribute for the
8367 compilation unit. If the DW_AT_high_pc is missing, synthesize
8368 it, by scanning the DIE's below the compilation unit. */
8369 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8371 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8372 static_block = end_symtab_get_static_block (addr, 0, 1);
8374 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8375 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8376 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8377 addrmap to help ensure it has an accurate map of pc values belonging to
8379 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8381 cust = end_symtab_from_static_block (static_block,
8382 SECT_OFF_TEXT (objfile), 0);
8386 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8388 /* Set symtab language to language from DW_AT_language. If the
8389 compilation is from a C file generated by language preprocessors, do
8390 not set the language if it was already deduced by start_subfile. */
8391 if (!(cu->language == language_c
8392 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8393 COMPUNIT_FILETABS (cust)->language = cu->language;
8395 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8396 produce DW_AT_location with location lists but it can be possibly
8397 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8398 there were bugs in prologue debug info, fixed later in GCC-4.5
8399 by "unwind info for epilogues" patch (which is not directly related).
8401 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8402 needed, it would be wrong due to missing DW_AT_producer there.
8404 Still one can confuse GDB by using non-standard GCC compilation
8405 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8407 if (cu->has_loclist && gcc_4_minor >= 5)
8408 cust->locations_valid = 1;
8410 if (gcc_4_minor >= 5)
8411 cust->epilogue_unwind_valid = 1;
8413 cust->call_site_htab = cu->call_site_htab;
8416 if (dwarf2_per_objfile->using_index)
8417 per_cu->v.quick->compunit_symtab = cust;
8420 struct partial_symtab *pst = per_cu->v.psymtab;
8421 pst->compunit_symtab = cust;
8425 /* Push it for inclusion processing later. */
8426 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
8428 do_cleanups (back_to);
8431 /* Generate full symbol information for type unit PER_CU, whose DIEs have
8432 already been loaded into memory. */
8435 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
8436 enum language pretend_language)
8438 struct dwarf2_cu *cu = per_cu->cu;
8439 struct objfile *objfile = per_cu->objfile;
8440 struct compunit_symtab *cust;
8441 struct cleanup *back_to, *delayed_list_cleanup;
8442 struct signatured_type *sig_type;
8444 gdb_assert (per_cu->is_debug_types);
8445 sig_type = (struct signatured_type *) per_cu;
8448 back_to = make_cleanup (really_free_pendings, NULL);
8449 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8451 cu->list_in_scope = &file_symbols;
8453 cu->language = pretend_language;
8454 cu->language_defn = language_def (cu->language);
8456 /* The symbol tables are set up in read_type_unit_scope. */
8457 process_die (cu->dies, cu);
8459 /* For now fudge the Go package. */
8460 if (cu->language == language_go)
8461 fixup_go_packaging (cu);
8463 /* Now that we have processed all the DIEs in the CU, all the types
8464 should be complete, and it should now be safe to compute all of the
8466 compute_delayed_physnames (cu);
8467 do_cleanups (delayed_list_cleanup);
8469 /* TUs share symbol tables.
8470 If this is the first TU to use this symtab, complete the construction
8471 of it with end_expandable_symtab. Otherwise, complete the addition of
8472 this TU's symbols to the existing symtab. */
8473 if (sig_type->type_unit_group->compunit_symtab == NULL)
8475 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
8476 sig_type->type_unit_group->compunit_symtab = cust;
8480 /* Set symtab language to language from DW_AT_language. If the
8481 compilation is from a C file generated by language preprocessors,
8482 do not set the language if it was already deduced by
8484 if (!(cu->language == language_c
8485 && COMPUNIT_FILETABS (cust)->language != language_c))
8486 COMPUNIT_FILETABS (cust)->language = cu->language;
8491 augment_type_symtab ();
8492 cust = sig_type->type_unit_group->compunit_symtab;
8495 if (dwarf2_per_objfile->using_index)
8496 per_cu->v.quick->compunit_symtab = cust;
8499 struct partial_symtab *pst = per_cu->v.psymtab;
8500 pst->compunit_symtab = cust;
8504 do_cleanups (back_to);
8507 /* Process an imported unit DIE. */
8510 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8512 struct attribute *attr;
8514 /* For now we don't handle imported units in type units. */
8515 if (cu->per_cu->is_debug_types)
8517 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8518 " supported in type units [in module %s]"),
8519 objfile_name (cu->objfile));
8522 attr = dwarf2_attr (die, DW_AT_import, cu);
8525 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
8526 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8527 dwarf2_per_cu_data *per_cu
8528 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
8530 /* If necessary, add it to the queue and load its DIEs. */
8531 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8532 load_full_comp_unit (per_cu, cu->language);
8534 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8539 /* RAII object that represents a process_die scope: i.e.,
8540 starts/finishes processing a DIE. */
8541 class process_die_scope
8544 process_die_scope (die_info *die, dwarf2_cu *cu)
8545 : m_die (die), m_cu (cu)
8547 /* We should only be processing DIEs not already in process. */
8548 gdb_assert (!m_die->in_process);
8549 m_die->in_process = true;
8552 ~process_die_scope ()
8554 m_die->in_process = false;
8556 /* If we're done processing the DIE for the CU that owns the line
8557 header, we don't need the line header anymore. */
8558 if (m_cu->line_header_die_owner == m_die)
8560 delete m_cu->line_header;
8561 m_cu->line_header = NULL;
8562 m_cu->line_header_die_owner = NULL;
8571 /* Process a die and its children. */
8574 process_die (struct die_info *die, struct dwarf2_cu *cu)
8576 process_die_scope scope (die, cu);
8580 case DW_TAG_padding:
8582 case DW_TAG_compile_unit:
8583 case DW_TAG_partial_unit:
8584 read_file_scope (die, cu);
8586 case DW_TAG_type_unit:
8587 read_type_unit_scope (die, cu);
8589 case DW_TAG_subprogram:
8590 case DW_TAG_inlined_subroutine:
8591 read_func_scope (die, cu);
8593 case DW_TAG_lexical_block:
8594 case DW_TAG_try_block:
8595 case DW_TAG_catch_block:
8596 read_lexical_block_scope (die, cu);
8598 case DW_TAG_call_site:
8599 case DW_TAG_GNU_call_site:
8600 read_call_site_scope (die, cu);
8602 case DW_TAG_class_type:
8603 case DW_TAG_interface_type:
8604 case DW_TAG_structure_type:
8605 case DW_TAG_union_type:
8606 process_structure_scope (die, cu);
8608 case DW_TAG_enumeration_type:
8609 process_enumeration_scope (die, cu);
8612 /* These dies have a type, but processing them does not create
8613 a symbol or recurse to process the children. Therefore we can
8614 read them on-demand through read_type_die. */
8615 case DW_TAG_subroutine_type:
8616 case DW_TAG_set_type:
8617 case DW_TAG_array_type:
8618 case DW_TAG_pointer_type:
8619 case DW_TAG_ptr_to_member_type:
8620 case DW_TAG_reference_type:
8621 case DW_TAG_rvalue_reference_type:
8622 case DW_TAG_string_type:
8625 case DW_TAG_base_type:
8626 case DW_TAG_subrange_type:
8627 case DW_TAG_typedef:
8628 /* Add a typedef symbol for the type definition, if it has a
8630 new_symbol (die, read_type_die (die, cu), cu);
8632 case DW_TAG_common_block:
8633 read_common_block (die, cu);
8635 case DW_TAG_common_inclusion:
8637 case DW_TAG_namespace:
8638 cu->processing_has_namespace_info = 1;
8639 read_namespace (die, cu);
8642 cu->processing_has_namespace_info = 1;
8643 read_module (die, cu);
8645 case DW_TAG_imported_declaration:
8646 cu->processing_has_namespace_info = 1;
8647 if (read_namespace_alias (die, cu))
8649 /* The declaration is not a global namespace alias: fall through. */
8650 case DW_TAG_imported_module:
8651 cu->processing_has_namespace_info = 1;
8652 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8653 || cu->language != language_fortran))
8654 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8655 dwarf_tag_name (die->tag));
8656 read_import_statement (die, cu);
8659 case DW_TAG_imported_unit:
8660 process_imported_unit_die (die, cu);
8664 new_symbol (die, NULL, cu);
8669 /* DWARF name computation. */
8671 /* A helper function for dwarf2_compute_name which determines whether DIE
8672 needs to have the name of the scope prepended to the name listed in the
8676 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8678 struct attribute *attr;
8682 case DW_TAG_namespace:
8683 case DW_TAG_typedef:
8684 case DW_TAG_class_type:
8685 case DW_TAG_interface_type:
8686 case DW_TAG_structure_type:
8687 case DW_TAG_union_type:
8688 case DW_TAG_enumeration_type:
8689 case DW_TAG_enumerator:
8690 case DW_TAG_subprogram:
8691 case DW_TAG_inlined_subroutine:
8693 case DW_TAG_imported_declaration:
8696 case DW_TAG_variable:
8697 case DW_TAG_constant:
8698 /* We only need to prefix "globally" visible variables. These include
8699 any variable marked with DW_AT_external or any variable that
8700 lives in a namespace. [Variables in anonymous namespaces
8701 require prefixing, but they are not DW_AT_external.] */
8703 if (dwarf2_attr (die, DW_AT_specification, cu))
8705 struct dwarf2_cu *spec_cu = cu;
8707 return die_needs_namespace (die_specification (die, &spec_cu),
8711 attr = dwarf2_attr (die, DW_AT_external, cu);
8712 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8713 && die->parent->tag != DW_TAG_module)
8715 /* A variable in a lexical block of some kind does not need a
8716 namespace, even though in C++ such variables may be external
8717 and have a mangled name. */
8718 if (die->parent->tag == DW_TAG_lexical_block
8719 || die->parent->tag == DW_TAG_try_block
8720 || die->parent->tag == DW_TAG_catch_block
8721 || die->parent->tag == DW_TAG_subprogram)
8730 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
8731 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
8732 defined for the given DIE. */
8734 static struct attribute *
8735 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
8737 struct attribute *attr;
8739 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8741 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8746 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
8747 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
8748 defined for the given DIE. */
8751 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
8753 const char *linkage_name;
8755 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8756 if (linkage_name == NULL)
8757 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8759 return linkage_name;
8762 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8763 compute the physname for the object, which include a method's:
8764 - formal parameters (C++),
8765 - receiver type (Go),
8767 The term "physname" is a bit confusing.
8768 For C++, for example, it is the demangled name.
8769 For Go, for example, it's the mangled name.
8771 For Ada, return the DIE's linkage name rather than the fully qualified
8772 name. PHYSNAME is ignored..
8774 The result is allocated on the objfile_obstack and canonicalized. */
8777 dwarf2_compute_name (const char *name,
8778 struct die_info *die, struct dwarf2_cu *cu,
8781 struct objfile *objfile = cu->objfile;
8784 name = dwarf2_name (die, cu);
8786 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8787 but otherwise compute it by typename_concat inside GDB.
8788 FIXME: Actually this is not really true, or at least not always true.
8789 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8790 Fortran names because there is no mangling standard. So new_symbol_full
8791 will set the demangled name to the result of dwarf2_full_name, and it is
8792 the demangled name that GDB uses if it exists. */
8793 if (cu->language == language_ada
8794 || (cu->language == language_fortran && physname))
8796 /* For Ada unit, we prefer the linkage name over the name, as
8797 the former contains the exported name, which the user expects
8798 to be able to reference. Ideally, we want the user to be able
8799 to reference this entity using either natural or linkage name,
8800 but we haven't started looking at this enhancement yet. */
8801 const char *linkage_name = dw2_linkage_name (die, cu);
8803 if (linkage_name != NULL)
8804 return linkage_name;
8807 /* These are the only languages we know how to qualify names in. */
8809 && (cu->language == language_cplus
8810 || cu->language == language_fortran || cu->language == language_d
8811 || cu->language == language_rust))
8813 if (die_needs_namespace (die, cu))
8817 const char *canonical_name = NULL;
8821 prefix = determine_prefix (die, cu);
8822 if (*prefix != '\0')
8824 char *prefixed_name = typename_concat (NULL, prefix, name,
8827 buf.puts (prefixed_name);
8828 xfree (prefixed_name);
8833 /* Template parameters may be specified in the DIE's DW_AT_name, or
8834 as children with DW_TAG_template_type_param or
8835 DW_TAG_value_type_param. If the latter, add them to the name
8836 here. If the name already has template parameters, then
8837 skip this step; some versions of GCC emit both, and
8838 it is more efficient to use the pre-computed name.
8840 Something to keep in mind about this process: it is very
8841 unlikely, or in some cases downright impossible, to produce
8842 something that will match the mangled name of a function.
8843 If the definition of the function has the same debug info,
8844 we should be able to match up with it anyway. But fallbacks
8845 using the minimal symbol, for instance to find a method
8846 implemented in a stripped copy of libstdc++, will not work.
8847 If we do not have debug info for the definition, we will have to
8848 match them up some other way.
8850 When we do name matching there is a related problem with function
8851 templates; two instantiated function templates are allowed to
8852 differ only by their return types, which we do not add here. */
8854 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8856 struct attribute *attr;
8857 struct die_info *child;
8860 die->building_fullname = 1;
8862 for (child = die->child; child != NULL; child = child->sibling)
8866 const gdb_byte *bytes;
8867 struct dwarf2_locexpr_baton *baton;
8870 if (child->tag != DW_TAG_template_type_param
8871 && child->tag != DW_TAG_template_value_param)
8882 attr = dwarf2_attr (child, DW_AT_type, cu);
8885 complaint (&symfile_complaints,
8886 _("template parameter missing DW_AT_type"));
8887 buf.puts ("UNKNOWN_TYPE");
8890 type = die_type (child, cu);
8892 if (child->tag == DW_TAG_template_type_param)
8894 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
8898 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8901 complaint (&symfile_complaints,
8902 _("template parameter missing "
8903 "DW_AT_const_value"));
8904 buf.puts ("UNKNOWN_VALUE");
8908 dwarf2_const_value_attr (attr, type, name,
8909 &cu->comp_unit_obstack, cu,
8910 &value, &bytes, &baton);
8912 if (TYPE_NOSIGN (type))
8913 /* GDB prints characters as NUMBER 'CHAR'. If that's
8914 changed, this can use value_print instead. */
8915 c_printchar (value, type, &buf);
8918 struct value_print_options opts;
8921 v = dwarf2_evaluate_loc_desc (type, NULL,
8925 else if (bytes != NULL)
8927 v = allocate_value (type);
8928 memcpy (value_contents_writeable (v), bytes,
8929 TYPE_LENGTH (type));
8932 v = value_from_longest (type, value);
8934 /* Specify decimal so that we do not depend on
8936 get_formatted_print_options (&opts, 'd');
8938 value_print (v, &buf, &opts);
8944 die->building_fullname = 0;
8948 /* Close the argument list, with a space if necessary
8949 (nested templates). */
8950 if (!buf.empty () && buf.string ().back () == '>')
8957 /* For C++ methods, append formal parameter type
8958 information, if PHYSNAME. */
8960 if (physname && die->tag == DW_TAG_subprogram
8961 && cu->language == language_cplus)
8963 struct type *type = read_type_die (die, cu);
8965 c_type_print_args (type, &buf, 1, cu->language,
8966 &type_print_raw_options);
8968 if (cu->language == language_cplus)
8970 /* Assume that an artificial first parameter is
8971 "this", but do not crash if it is not. RealView
8972 marks unnamed (and thus unused) parameters as
8973 artificial; there is no way to differentiate
8975 if (TYPE_NFIELDS (type) > 0
8976 && TYPE_FIELD_ARTIFICIAL (type, 0)
8977 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8978 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8980 buf.puts (" const");
8984 const std::string &intermediate_name = buf.string ();
8986 if (cu->language == language_cplus)
8988 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8989 &objfile->per_bfd->storage_obstack);
8991 /* If we only computed INTERMEDIATE_NAME, or if
8992 INTERMEDIATE_NAME is already canonical, then we need to
8993 copy it to the appropriate obstack. */
8994 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
8995 name = ((const char *)
8996 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8997 intermediate_name.c_str (),
8998 intermediate_name.length ()));
9000 name = canonical_name;
9007 /* Return the fully qualified name of DIE, based on its DW_AT_name.
9008 If scope qualifiers are appropriate they will be added. The result
9009 will be allocated on the storage_obstack, or NULL if the DIE does
9010 not have a name. NAME may either be from a previous call to
9011 dwarf2_name or NULL.
9013 The output string will be canonicalized (if C++). */
9016 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9018 return dwarf2_compute_name (name, die, cu, 0);
9021 /* Construct a physname for the given DIE in CU. NAME may either be
9022 from a previous call to dwarf2_name or NULL. The result will be
9023 allocated on the objfile_objstack or NULL if the DIE does not have a
9026 The output string will be canonicalized (if C++). */
9029 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9031 struct objfile *objfile = cu->objfile;
9032 const char *retval, *mangled = NULL, *canon = NULL;
9033 struct cleanup *back_to;
9036 /* In this case dwarf2_compute_name is just a shortcut not building anything
9038 if (!die_needs_namespace (die, cu))
9039 return dwarf2_compute_name (name, die, cu, 1);
9041 back_to = make_cleanup (null_cleanup, NULL);
9043 mangled = dw2_linkage_name (die, cu);
9045 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
9046 See https://github.com/rust-lang/rust/issues/32925. */
9047 if (cu->language == language_rust && mangled != NULL
9048 && strchr (mangled, '{') != NULL)
9051 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
9053 if (mangled != NULL)
9057 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
9058 type. It is easier for GDB users to search for such functions as
9059 `name(params)' than `long name(params)'. In such case the minimal
9060 symbol names do not match the full symbol names but for template
9061 functions there is never a need to look up their definition from their
9062 declaration so the only disadvantage remains the minimal symbol
9063 variant `long name(params)' does not have the proper inferior type.
9066 if (cu->language == language_go)
9068 /* This is a lie, but we already lie to the caller new_symbol_full.
9069 new_symbol_full assumes we return the mangled name.
9070 This just undoes that lie until things are cleaned up. */
9075 demangled = gdb_demangle (mangled,
9076 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
9080 make_cleanup (xfree, demangled);
9090 if (canon == NULL || check_physname)
9092 const char *physname = dwarf2_compute_name (name, die, cu, 1);
9094 if (canon != NULL && strcmp (physname, canon) != 0)
9096 /* It may not mean a bug in GDB. The compiler could also
9097 compute DW_AT_linkage_name incorrectly. But in such case
9098 GDB would need to be bug-to-bug compatible. */
9100 complaint (&symfile_complaints,
9101 _("Computed physname <%s> does not match demangled <%s> "
9102 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
9103 physname, canon, mangled, to_underlying (die->sect_off),
9104 objfile_name (objfile));
9106 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9107 is available here - over computed PHYSNAME. It is safer
9108 against both buggy GDB and buggy compilers. */
9122 retval = ((const char *)
9123 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9124 retval, strlen (retval)));
9126 do_cleanups (back_to);
9130 /* Inspect DIE in CU for a namespace alias. If one exists, record
9131 a new symbol for it.
9133 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9136 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9138 struct attribute *attr;
9140 /* If the die does not have a name, this is not a namespace
9142 attr = dwarf2_attr (die, DW_AT_name, cu);
9146 struct die_info *d = die;
9147 struct dwarf2_cu *imported_cu = cu;
9149 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9150 keep inspecting DIEs until we hit the underlying import. */
9151 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9152 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9154 attr = dwarf2_attr (d, DW_AT_import, cu);
9158 d = follow_die_ref (d, attr, &imported_cu);
9159 if (d->tag != DW_TAG_imported_declaration)
9163 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
9165 complaint (&symfile_complaints,
9166 _("DIE at 0x%x has too many recursively imported "
9167 "declarations"), to_underlying (d->sect_off));
9174 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9176 type = get_die_type_at_offset (sect_off, cu->per_cu);
9177 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9179 /* This declaration is a global namespace alias. Add
9180 a symbol for it whose type is the aliased namespace. */
9181 new_symbol (die, type, cu);
9190 /* Return the using directives repository (global or local?) to use in the
9191 current context for LANGUAGE.
9193 For Ada, imported declarations can materialize renamings, which *may* be
9194 global. However it is impossible (for now?) in DWARF to distinguish
9195 "external" imported declarations and "static" ones. As all imported
9196 declarations seem to be static in all other languages, make them all CU-wide
9197 global only in Ada. */
9199 static struct using_direct **
9200 using_directives (enum language language)
9202 if (language == language_ada && context_stack_depth == 0)
9203 return &global_using_directives;
9205 return &local_using_directives;
9208 /* Read the import statement specified by the given die and record it. */
9211 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9213 struct objfile *objfile = cu->objfile;
9214 struct attribute *import_attr;
9215 struct die_info *imported_die, *child_die;
9216 struct dwarf2_cu *imported_cu;
9217 const char *imported_name;
9218 const char *imported_name_prefix;
9219 const char *canonical_name;
9220 const char *import_alias;
9221 const char *imported_declaration = NULL;
9222 const char *import_prefix;
9223 std::vector<const char *> excludes;
9225 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9226 if (import_attr == NULL)
9228 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9229 dwarf_tag_name (die->tag));
9234 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9235 imported_name = dwarf2_name (imported_die, imported_cu);
9236 if (imported_name == NULL)
9238 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9240 The import in the following code:
9254 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9255 <52> DW_AT_decl_file : 1
9256 <53> DW_AT_decl_line : 6
9257 <54> DW_AT_import : <0x75>
9258 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9260 <5b> DW_AT_decl_file : 1
9261 <5c> DW_AT_decl_line : 2
9262 <5d> DW_AT_type : <0x6e>
9264 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9265 <76> DW_AT_byte_size : 4
9266 <77> DW_AT_encoding : 5 (signed)
9268 imports the wrong die ( 0x75 instead of 0x58 ).
9269 This case will be ignored until the gcc bug is fixed. */
9273 /* Figure out the local name after import. */
9274 import_alias = dwarf2_name (die, cu);
9276 /* Figure out where the statement is being imported to. */
9277 import_prefix = determine_prefix (die, cu);
9279 /* Figure out what the scope of the imported die is and prepend it
9280 to the name of the imported die. */
9281 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9283 if (imported_die->tag != DW_TAG_namespace
9284 && imported_die->tag != DW_TAG_module)
9286 imported_declaration = imported_name;
9287 canonical_name = imported_name_prefix;
9289 else if (strlen (imported_name_prefix) > 0)
9290 canonical_name = obconcat (&objfile->objfile_obstack,
9291 imported_name_prefix,
9292 (cu->language == language_d ? "." : "::"),
9293 imported_name, (char *) NULL);
9295 canonical_name = imported_name;
9297 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9298 for (child_die = die->child; child_die && child_die->tag;
9299 child_die = sibling_die (child_die))
9301 /* DWARF-4: A Fortran use statement with a “rename list” may be
9302 represented by an imported module entry with an import attribute
9303 referring to the module and owned entries corresponding to those
9304 entities that are renamed as part of being imported. */
9306 if (child_die->tag != DW_TAG_imported_declaration)
9308 complaint (&symfile_complaints,
9309 _("child DW_TAG_imported_declaration expected "
9310 "- DIE at 0x%x [in module %s]"),
9311 to_underlying (child_die->sect_off), objfile_name (objfile));
9315 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9316 if (import_attr == NULL)
9318 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9319 dwarf_tag_name (child_die->tag));
9324 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9326 imported_name = dwarf2_name (imported_die, imported_cu);
9327 if (imported_name == NULL)
9329 complaint (&symfile_complaints,
9330 _("child DW_TAG_imported_declaration has unknown "
9331 "imported name - DIE at 0x%x [in module %s]"),
9332 to_underlying (child_die->sect_off), objfile_name (objfile));
9336 excludes.push_back (imported_name);
9338 process_die (child_die, cu);
9341 add_using_directive (using_directives (cu->language),
9345 imported_declaration,
9348 &objfile->objfile_obstack);
9351 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9352 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9353 this, it was first present in GCC release 4.3.0. */
9356 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9358 if (!cu->checked_producer)
9359 check_producer (cu);
9361 return cu->producer_is_gcc_lt_4_3;
9364 static file_and_directory
9365 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9367 file_and_directory res;
9369 /* Find the filename. Do not use dwarf2_name here, since the filename
9370 is not a source language identifier. */
9371 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9372 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9374 if (res.comp_dir == NULL
9375 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9376 && IS_ABSOLUTE_PATH (res.name))
9378 res.comp_dir_storage = ldirname (res.name);
9379 if (!res.comp_dir_storage.empty ())
9380 res.comp_dir = res.comp_dir_storage.c_str ();
9382 if (res.comp_dir != NULL)
9384 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9385 directory, get rid of it. */
9386 const char *cp = strchr (res.comp_dir, ':');
9388 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9389 res.comp_dir = cp + 1;
9392 if (res.name == NULL)
9393 res.name = "<unknown>";
9398 /* Handle DW_AT_stmt_list for a compilation unit.
9399 DIE is the DW_TAG_compile_unit die for CU.
9400 COMP_DIR is the compilation directory. LOWPC is passed to
9401 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9404 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9405 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9407 struct objfile *objfile = dwarf2_per_objfile->objfile;
9408 struct attribute *attr;
9409 struct line_header line_header_local;
9410 hashval_t line_header_local_hash;
9415 gdb_assert (! cu->per_cu->is_debug_types);
9417 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9421 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9423 /* The line header hash table is only created if needed (it exists to
9424 prevent redundant reading of the line table for partial_units).
9425 If we're given a partial_unit, we'll need it. If we're given a
9426 compile_unit, then use the line header hash table if it's already
9427 created, but don't create one just yet. */
9429 if (dwarf2_per_objfile->line_header_hash == NULL
9430 && die->tag == DW_TAG_partial_unit)
9432 dwarf2_per_objfile->line_header_hash
9433 = htab_create_alloc_ex (127, line_header_hash_voidp,
9434 line_header_eq_voidp,
9435 free_line_header_voidp,
9436 &objfile->objfile_obstack,
9437 hashtab_obstack_allocate,
9438 dummy_obstack_deallocate);
9441 line_header_local.sect_off = line_offset;
9442 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9443 line_header_local_hash = line_header_hash (&line_header_local);
9444 if (dwarf2_per_objfile->line_header_hash != NULL)
9446 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9448 line_header_local_hash, NO_INSERT);
9450 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9451 is not present in *SLOT (since if there is something in *SLOT then
9452 it will be for a partial_unit). */
9453 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9455 gdb_assert (*slot != NULL);
9456 cu->line_header = (struct line_header *) *slot;
9461 /* dwarf_decode_line_header does not yet provide sufficient information.
9462 We always have to call also dwarf_decode_lines for it. */
9463 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
9467 cu->line_header = lh.release ();
9468 cu->line_header_die_owner = die;
9470 if (dwarf2_per_objfile->line_header_hash == NULL)
9474 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9476 line_header_local_hash, INSERT);
9477 gdb_assert (slot != NULL);
9479 if (slot != NULL && *slot == NULL)
9481 /* This newly decoded line number information unit will be owned
9482 by line_header_hash hash table. */
9483 *slot = cu->line_header;
9484 cu->line_header_die_owner = NULL;
9488 /* We cannot free any current entry in (*slot) as that struct line_header
9489 may be already used by multiple CUs. Create only temporary decoded
9490 line_header for this CU - it may happen at most once for each line
9491 number information unit. And if we're not using line_header_hash
9492 then this is what we want as well. */
9493 gdb_assert (die->tag != DW_TAG_partial_unit);
9495 decode_mapping = (die->tag != DW_TAG_partial_unit);
9496 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9501 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9504 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9506 struct objfile *objfile = dwarf2_per_objfile->objfile;
9507 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9508 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9509 CORE_ADDR highpc = ((CORE_ADDR) 0);
9510 struct attribute *attr;
9511 struct die_info *child_die;
9514 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9516 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9518 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9519 from finish_block. */
9520 if (lowpc == ((CORE_ADDR) -1))
9522 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9524 file_and_directory fnd = find_file_and_directory (die, cu);
9526 prepare_one_comp_unit (cu, die, cu->language);
9528 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9529 standardised yet. As a workaround for the language detection we fall
9530 back to the DW_AT_producer string. */
9531 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9532 cu->language = language_opencl;
9534 /* Similar hack for Go. */
9535 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9536 set_cu_language (DW_LANG_Go, cu);
9538 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
9540 /* Decode line number information if present. We do this before
9541 processing child DIEs, so that the line header table is available
9542 for DW_AT_decl_file. */
9543 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
9545 /* Process all dies in compilation unit. */
9546 if (die->child != NULL)
9548 child_die = die->child;
9549 while (child_die && child_die->tag)
9551 process_die (child_die, cu);
9552 child_die = sibling_die (child_die);
9556 /* Decode macro information, if present. Dwarf 2 macro information
9557 refers to information in the line number info statement program
9558 header, so we can only read it if we've read the header
9560 attr = dwarf2_attr (die, DW_AT_macros, cu);
9562 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9563 if (attr && cu->line_header)
9565 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9566 complaint (&symfile_complaints,
9567 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
9569 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9573 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9574 if (attr && cu->line_header)
9576 unsigned int macro_offset = DW_UNSND (attr);
9578 dwarf_decode_macros (cu, macro_offset, 0);
9583 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9584 Create the set of symtabs used by this TU, or if this TU is sharing
9585 symtabs with another TU and the symtabs have already been created
9586 then restore those symtabs in the line header.
9587 We don't need the pc/line-number mapping for type units. */
9590 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9592 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9593 struct type_unit_group *tu_group;
9595 struct attribute *attr;
9597 struct signatured_type *sig_type;
9599 gdb_assert (per_cu->is_debug_types);
9600 sig_type = (struct signatured_type *) per_cu;
9602 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9604 /* If we're using .gdb_index (includes -readnow) then
9605 per_cu->type_unit_group may not have been set up yet. */
9606 if (sig_type->type_unit_group == NULL)
9607 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9608 tu_group = sig_type->type_unit_group;
9610 /* If we've already processed this stmt_list there's no real need to
9611 do it again, we could fake it and just recreate the part we need
9612 (file name,index -> symtab mapping). If data shows this optimization
9613 is useful we can do it then. */
9614 first_time = tu_group->compunit_symtab == NULL;
9616 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9621 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9622 lh = dwarf_decode_line_header (line_offset, cu);
9627 dwarf2_start_symtab (cu, "", NULL, 0);
9630 gdb_assert (tu_group->symtabs == NULL);
9631 restart_symtab (tu_group->compunit_symtab, "", 0);
9636 cu->line_header = lh.release ();
9637 cu->line_header_die_owner = die;
9641 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9643 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9644 still initializing it, and our caller (a few levels up)
9645 process_full_type_unit still needs to know if this is the first
9648 tu_group->num_symtabs = cu->line_header->file_names.size ();
9649 tu_group->symtabs = XNEWVEC (struct symtab *,
9650 cu->line_header->file_names.size ());
9652 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9654 file_entry &fe = cu->line_header->file_names[i];
9656 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
9658 if (current_subfile->symtab == NULL)
9660 /* NOTE: start_subfile will recognize when it's been
9661 passed a file it has already seen. So we can't
9662 assume there's a simple mapping from
9663 cu->line_header->file_names to subfiles, plus
9664 cu->line_header->file_names may contain dups. */
9665 current_subfile->symtab
9666 = allocate_symtab (cust, current_subfile->name);
9669 fe.symtab = current_subfile->symtab;
9670 tu_group->symtabs[i] = fe.symtab;
9675 restart_symtab (tu_group->compunit_symtab, "", 0);
9677 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9679 file_entry &fe = cu->line_header->file_names[i];
9681 fe.symtab = tu_group->symtabs[i];
9685 /* The main symtab is allocated last. Type units don't have DW_AT_name
9686 so they don't have a "real" (so to speak) symtab anyway.
9687 There is later code that will assign the main symtab to all symbols
9688 that don't have one. We need to handle the case of a symbol with a
9689 missing symtab (DW_AT_decl_file) anyway. */
9692 /* Process DW_TAG_type_unit.
9693 For TUs we want to skip the first top level sibling if it's not the
9694 actual type being defined by this TU. In this case the first top
9695 level sibling is there to provide context only. */
9698 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9700 struct die_info *child_die;
9702 prepare_one_comp_unit (cu, die, language_minimal);
9704 /* Initialize (or reinitialize) the machinery for building symtabs.
9705 We do this before processing child DIEs, so that the line header table
9706 is available for DW_AT_decl_file. */
9707 setup_type_unit_groups (die, cu);
9709 if (die->child != NULL)
9711 child_die = die->child;
9712 while (child_die && child_die->tag)
9714 process_die (child_die, cu);
9715 child_die = sibling_die (child_die);
9722 http://gcc.gnu.org/wiki/DebugFission
9723 http://gcc.gnu.org/wiki/DebugFissionDWP
9725 To simplify handling of both DWO files ("object" files with the DWARF info)
9726 and DWP files (a file with the DWOs packaged up into one file), we treat
9727 DWP files as having a collection of virtual DWO files. */
9730 hash_dwo_file (const void *item)
9732 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9735 hash = htab_hash_string (dwo_file->dwo_name);
9736 if (dwo_file->comp_dir != NULL)
9737 hash += htab_hash_string (dwo_file->comp_dir);
9742 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9744 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9745 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9747 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9749 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9750 return lhs->comp_dir == rhs->comp_dir;
9751 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9754 /* Allocate a hash table for DWO files. */
9757 allocate_dwo_file_hash_table (void)
9759 struct objfile *objfile = dwarf2_per_objfile->objfile;
9761 return htab_create_alloc_ex (41,
9765 &objfile->objfile_obstack,
9766 hashtab_obstack_allocate,
9767 dummy_obstack_deallocate);
9770 /* Lookup DWO file DWO_NAME. */
9773 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9775 struct dwo_file find_entry;
9778 if (dwarf2_per_objfile->dwo_files == NULL)
9779 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9781 memset (&find_entry, 0, sizeof (find_entry));
9782 find_entry.dwo_name = dwo_name;
9783 find_entry.comp_dir = comp_dir;
9784 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9790 hash_dwo_unit (const void *item)
9792 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9794 /* This drops the top 32 bits of the id, but is ok for a hash. */
9795 return dwo_unit->signature;
9799 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9801 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9802 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9804 /* The signature is assumed to be unique within the DWO file.
9805 So while object file CU dwo_id's always have the value zero,
9806 that's OK, assuming each object file DWO file has only one CU,
9807 and that's the rule for now. */
9808 return lhs->signature == rhs->signature;
9811 /* Allocate a hash table for DWO CUs,TUs.
9812 There is one of these tables for each of CUs,TUs for each DWO file. */
9815 allocate_dwo_unit_table (struct objfile *objfile)
9817 /* Start out with a pretty small number.
9818 Generally DWO files contain only one CU and maybe some TUs. */
9819 return htab_create_alloc_ex (3,
9823 &objfile->objfile_obstack,
9824 hashtab_obstack_allocate,
9825 dummy_obstack_deallocate);
9828 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9830 struct create_dwo_cu_data
9832 struct dwo_file *dwo_file;
9833 struct dwo_unit dwo_unit;
9836 /* die_reader_func for create_dwo_cu. */
9839 create_dwo_cu_reader (const struct die_reader_specs *reader,
9840 const gdb_byte *info_ptr,
9841 struct die_info *comp_unit_die,
9845 struct dwarf2_cu *cu = reader->cu;
9846 sect_offset sect_off = cu->per_cu->sect_off;
9847 struct dwarf2_section_info *section = cu->per_cu->section;
9848 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9849 struct dwo_file *dwo_file = data->dwo_file;
9850 struct dwo_unit *dwo_unit = &data->dwo_unit;
9851 struct attribute *attr;
9853 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9856 complaint (&symfile_complaints,
9857 _("Dwarf Error: debug entry at offset 0x%x is missing"
9858 " its dwo_id [in module %s]"),
9859 to_underlying (sect_off), dwo_file->dwo_name);
9863 dwo_unit->dwo_file = dwo_file;
9864 dwo_unit->signature = DW_UNSND (attr);
9865 dwo_unit->section = section;
9866 dwo_unit->sect_off = sect_off;
9867 dwo_unit->length = cu->per_cu->length;
9869 if (dwarf_read_debug)
9870 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9871 to_underlying (sect_off),
9872 hex_string (dwo_unit->signature));
9875 /* Create the dwo_units for the CUs in a DWO_FILE.
9876 Note: This function processes DWO files only, not DWP files. */
9879 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
9882 struct objfile *objfile = dwarf2_per_objfile->objfile;
9883 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
9884 const gdb_byte *info_ptr, *end_ptr;
9886 dwarf2_read_section (objfile, §ion);
9887 info_ptr = section.buffer;
9889 if (info_ptr == NULL)
9892 if (dwarf_read_debug)
9894 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9895 get_section_name (§ion),
9896 get_section_file_name (§ion));
9899 end_ptr = info_ptr + section.size;
9900 while (info_ptr < end_ptr)
9902 struct dwarf2_per_cu_data per_cu;
9903 struct create_dwo_cu_data create_dwo_cu_data;
9904 struct dwo_unit *dwo_unit;
9906 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
9908 memset (&create_dwo_cu_data.dwo_unit, 0,
9909 sizeof (create_dwo_cu_data.dwo_unit));
9910 memset (&per_cu, 0, sizeof (per_cu));
9911 per_cu.objfile = objfile;
9912 per_cu.is_debug_types = 0;
9913 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
9914 per_cu.section = §ion;
9915 create_dwo_cu_data.dwo_file = &dwo_file;
9917 init_cutu_and_read_dies_no_follow (
9918 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
9919 info_ptr += per_cu.length;
9921 // If the unit could not be parsed, skip it.
9922 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
9925 if (cus_htab == NULL)
9926 cus_htab = allocate_dwo_unit_table (objfile);
9928 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9929 *dwo_unit = create_dwo_cu_data.dwo_unit;
9930 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
9931 gdb_assert (slot != NULL);
9934 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
9935 sect_offset dup_sect_off = dup_cu->sect_off;
9937 complaint (&symfile_complaints,
9938 _("debug cu entry at offset 0x%x is duplicate to"
9939 " the entry at offset 0x%x, signature %s"),
9940 to_underlying (sect_off), to_underlying (dup_sect_off),
9941 hex_string (dwo_unit->signature));
9943 *slot = (void *)dwo_unit;
9947 /* DWP file .debug_{cu,tu}_index section format:
9948 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9952 Both index sections have the same format, and serve to map a 64-bit
9953 signature to a set of section numbers. Each section begins with a header,
9954 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9955 indexes, and a pool of 32-bit section numbers. The index sections will be
9956 aligned at 8-byte boundaries in the file.
9958 The index section header consists of:
9960 V, 32 bit version number
9962 N, 32 bit number of compilation units or type units in the index
9963 M, 32 bit number of slots in the hash table
9965 Numbers are recorded using the byte order of the application binary.
9967 The hash table begins at offset 16 in the section, and consists of an array
9968 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9969 order of the application binary). Unused slots in the hash table are 0.
9970 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9972 The parallel table begins immediately after the hash table
9973 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9974 array of 32-bit indexes (using the byte order of the application binary),
9975 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9976 table contains a 32-bit index into the pool of section numbers. For unused
9977 hash table slots, the corresponding entry in the parallel table will be 0.
9979 The pool of section numbers begins immediately following the hash table
9980 (at offset 16 + 12 * M from the beginning of the section). The pool of
9981 section numbers consists of an array of 32-bit words (using the byte order
9982 of the application binary). Each item in the array is indexed starting
9983 from 0. The hash table entry provides the index of the first section
9984 number in the set. Additional section numbers in the set follow, and the
9985 set is terminated by a 0 entry (section number 0 is not used in ELF).
9987 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9988 section must be the first entry in the set, and the .debug_abbrev.dwo must
9989 be the second entry. Other members of the set may follow in any order.
9995 DWP Version 2 combines all the .debug_info, etc. sections into one,
9996 and the entries in the index tables are now offsets into these sections.
9997 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
10000 Index Section Contents:
10002 Hash Table of Signatures dwp_hash_table.hash_table
10003 Parallel Table of Indices dwp_hash_table.unit_table
10004 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
10005 Table of Section Sizes dwp_hash_table.v2.sizes
10007 The index section header consists of:
10009 V, 32 bit version number
10010 L, 32 bit number of columns in the table of section offsets
10011 N, 32 bit number of compilation units or type units in the index
10012 M, 32 bit number of slots in the hash table
10014 Numbers are recorded using the byte order of the application binary.
10016 The hash table has the same format as version 1.
10017 The parallel table of indices has the same format as version 1,
10018 except that the entries are origin-1 indices into the table of sections
10019 offsets and the table of section sizes.
10021 The table of offsets begins immediately following the parallel table
10022 (at offset 16 + 12 * M from the beginning of the section). The table is
10023 a two-dimensional array of 32-bit words (using the byte order of the
10024 application binary), with L columns and N+1 rows, in row-major order.
10025 Each row in the array is indexed starting from 0. The first row provides
10026 a key to the remaining rows: each column in this row provides an identifier
10027 for a debug section, and the offsets in the same column of subsequent rows
10028 refer to that section. The section identifiers are:
10030 DW_SECT_INFO 1 .debug_info.dwo
10031 DW_SECT_TYPES 2 .debug_types.dwo
10032 DW_SECT_ABBREV 3 .debug_abbrev.dwo
10033 DW_SECT_LINE 4 .debug_line.dwo
10034 DW_SECT_LOC 5 .debug_loc.dwo
10035 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
10036 DW_SECT_MACINFO 7 .debug_macinfo.dwo
10037 DW_SECT_MACRO 8 .debug_macro.dwo
10039 The offsets provided by the CU and TU index sections are the base offsets
10040 for the contributions made by each CU or TU to the corresponding section
10041 in the package file. Each CU and TU header contains an abbrev_offset
10042 field, used to find the abbreviations table for that CU or TU within the
10043 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
10044 be interpreted as relative to the base offset given in the index section.
10045 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
10046 should be interpreted as relative to the base offset for .debug_line.dwo,
10047 and offsets into other debug sections obtained from DWARF attributes should
10048 also be interpreted as relative to the corresponding base offset.
10050 The table of sizes begins immediately following the table of offsets.
10051 Like the table of offsets, it is a two-dimensional array of 32-bit words,
10052 with L columns and N rows, in row-major order. Each row in the array is
10053 indexed starting from 1 (row 0 is shared by the two tables).
10057 Hash table lookup is handled the same in version 1 and 2:
10059 We assume that N and M will not exceed 2^32 - 1.
10060 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
10062 Given a 64-bit compilation unit signature or a type signature S, an entry
10063 in the hash table is located as follows:
10065 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
10066 the low-order k bits all set to 1.
10068 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
10070 3) If the hash table entry at index H matches the signature, use that
10071 entry. If the hash table entry at index H is unused (all zeroes),
10072 terminate the search: the signature is not present in the table.
10074 4) Let H = (H + H') modulo M. Repeat at Step 3.
10076 Because M > N and H' and M are relatively prime, the search is guaranteed
10077 to stop at an unused slot or find the match. */
10079 /* Create a hash table to map DWO IDs to their CU/TU entry in
10080 .debug_{info,types}.dwo in DWP_FILE.
10081 Returns NULL if there isn't one.
10082 Note: This function processes DWP files only, not DWO files. */
10084 static struct dwp_hash_table *
10085 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
10087 struct objfile *objfile = dwarf2_per_objfile->objfile;
10088 bfd *dbfd = dwp_file->dbfd;
10089 const gdb_byte *index_ptr, *index_end;
10090 struct dwarf2_section_info *index;
10091 uint32_t version, nr_columns, nr_units, nr_slots;
10092 struct dwp_hash_table *htab;
10094 if (is_debug_types)
10095 index = &dwp_file->sections.tu_index;
10097 index = &dwp_file->sections.cu_index;
10099 if (dwarf2_section_empty_p (index))
10101 dwarf2_read_section (objfile, index);
10103 index_ptr = index->buffer;
10104 index_end = index_ptr + index->size;
10106 version = read_4_bytes (dbfd, index_ptr);
10109 nr_columns = read_4_bytes (dbfd, index_ptr);
10113 nr_units = read_4_bytes (dbfd, index_ptr);
10115 nr_slots = read_4_bytes (dbfd, index_ptr);
10118 if (version != 1 && version != 2)
10120 error (_("Dwarf Error: unsupported DWP file version (%s)"
10121 " [in module %s]"),
10122 pulongest (version), dwp_file->name);
10124 if (nr_slots != (nr_slots & -nr_slots))
10126 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10127 " is not power of 2 [in module %s]"),
10128 pulongest (nr_slots), dwp_file->name);
10131 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10132 htab->version = version;
10133 htab->nr_columns = nr_columns;
10134 htab->nr_units = nr_units;
10135 htab->nr_slots = nr_slots;
10136 htab->hash_table = index_ptr;
10137 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10139 /* Exit early if the table is empty. */
10140 if (nr_slots == 0 || nr_units == 0
10141 || (version == 2 && nr_columns == 0))
10143 /* All must be zero. */
10144 if (nr_slots != 0 || nr_units != 0
10145 || (version == 2 && nr_columns != 0))
10147 complaint (&symfile_complaints,
10148 _("Empty DWP but nr_slots,nr_units,nr_columns not"
10149 " all zero [in modules %s]"),
10157 htab->section_pool.v1.indices =
10158 htab->unit_table + sizeof (uint32_t) * nr_slots;
10159 /* It's harder to decide whether the section is too small in v1.
10160 V1 is deprecated anyway so we punt. */
10164 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
10165 int *ids = htab->section_pool.v2.section_ids;
10166 /* Reverse map for error checking. */
10167 int ids_seen[DW_SECT_MAX + 1];
10170 if (nr_columns < 2)
10172 error (_("Dwarf Error: bad DWP hash table, too few columns"
10173 " in section table [in module %s]"),
10176 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10178 error (_("Dwarf Error: bad DWP hash table, too many columns"
10179 " in section table [in module %s]"),
10182 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10183 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10184 for (i = 0; i < nr_columns; ++i)
10186 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10188 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10190 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10191 " in section table [in module %s]"),
10192 id, dwp_file->name);
10194 if (ids_seen[id] != -1)
10196 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10197 " id %d in section table [in module %s]"),
10198 id, dwp_file->name);
10203 /* Must have exactly one info or types section. */
10204 if (((ids_seen[DW_SECT_INFO] != -1)
10205 + (ids_seen[DW_SECT_TYPES] != -1))
10208 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10209 " DWO info/types section [in module %s]"),
10212 /* Must have an abbrev section. */
10213 if (ids_seen[DW_SECT_ABBREV] == -1)
10215 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10216 " section [in module %s]"),
10219 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10220 htab->section_pool.v2.sizes =
10221 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10222 * nr_units * nr_columns);
10223 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10224 * nr_units * nr_columns))
10227 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10228 " [in module %s]"),
10236 /* Update SECTIONS with the data from SECTP.
10238 This function is like the other "locate" section routines that are
10239 passed to bfd_map_over_sections, but in this context the sections to
10240 read comes from the DWP V1 hash table, not the full ELF section table.
10242 The result is non-zero for success, or zero if an error was found. */
10245 locate_v1_virtual_dwo_sections (asection *sectp,
10246 struct virtual_v1_dwo_sections *sections)
10248 const struct dwop_section_names *names = &dwop_section_names;
10250 if (section_is_p (sectp->name, &names->abbrev_dwo))
10252 /* There can be only one. */
10253 if (sections->abbrev.s.section != NULL)
10255 sections->abbrev.s.section = sectp;
10256 sections->abbrev.size = bfd_get_section_size (sectp);
10258 else if (section_is_p (sectp->name, &names->info_dwo)
10259 || section_is_p (sectp->name, &names->types_dwo))
10261 /* There can be only one. */
10262 if (sections->info_or_types.s.section != NULL)
10264 sections->info_or_types.s.section = sectp;
10265 sections->info_or_types.size = bfd_get_section_size (sectp);
10267 else if (section_is_p (sectp->name, &names->line_dwo))
10269 /* There can be only one. */
10270 if (sections->line.s.section != NULL)
10272 sections->line.s.section = sectp;
10273 sections->line.size = bfd_get_section_size (sectp);
10275 else if (section_is_p (sectp->name, &names->loc_dwo))
10277 /* There can be only one. */
10278 if (sections->loc.s.section != NULL)
10280 sections->loc.s.section = sectp;
10281 sections->loc.size = bfd_get_section_size (sectp);
10283 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10285 /* There can be only one. */
10286 if (sections->macinfo.s.section != NULL)
10288 sections->macinfo.s.section = sectp;
10289 sections->macinfo.size = bfd_get_section_size (sectp);
10291 else if (section_is_p (sectp->name, &names->macro_dwo))
10293 /* There can be only one. */
10294 if (sections->macro.s.section != NULL)
10296 sections->macro.s.section = sectp;
10297 sections->macro.size = bfd_get_section_size (sectp);
10299 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10301 /* There can be only one. */
10302 if (sections->str_offsets.s.section != NULL)
10304 sections->str_offsets.s.section = sectp;
10305 sections->str_offsets.size = bfd_get_section_size (sectp);
10309 /* No other kind of section is valid. */
10316 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10317 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10318 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10319 This is for DWP version 1 files. */
10321 static struct dwo_unit *
10322 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10323 uint32_t unit_index,
10324 const char *comp_dir,
10325 ULONGEST signature, int is_debug_types)
10327 struct objfile *objfile = dwarf2_per_objfile->objfile;
10328 const struct dwp_hash_table *dwp_htab =
10329 is_debug_types ? dwp_file->tus : dwp_file->cus;
10330 bfd *dbfd = dwp_file->dbfd;
10331 const char *kind = is_debug_types ? "TU" : "CU";
10332 struct dwo_file *dwo_file;
10333 struct dwo_unit *dwo_unit;
10334 struct virtual_v1_dwo_sections sections;
10335 void **dwo_file_slot;
10336 char *virtual_dwo_name;
10337 struct cleanup *cleanups;
10340 gdb_assert (dwp_file->version == 1);
10342 if (dwarf_read_debug)
10344 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10346 pulongest (unit_index), hex_string (signature),
10350 /* Fetch the sections of this DWO unit.
10351 Put a limit on the number of sections we look for so that bad data
10352 doesn't cause us to loop forever. */
10354 #define MAX_NR_V1_DWO_SECTIONS \
10355 (1 /* .debug_info or .debug_types */ \
10356 + 1 /* .debug_abbrev */ \
10357 + 1 /* .debug_line */ \
10358 + 1 /* .debug_loc */ \
10359 + 1 /* .debug_str_offsets */ \
10360 + 1 /* .debug_macro or .debug_macinfo */ \
10361 + 1 /* trailing zero */)
10363 memset (§ions, 0, sizeof (sections));
10364 cleanups = make_cleanup (null_cleanup, 0);
10366 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10369 uint32_t section_nr =
10370 read_4_bytes (dbfd,
10371 dwp_htab->section_pool.v1.indices
10372 + (unit_index + i) * sizeof (uint32_t));
10374 if (section_nr == 0)
10376 if (section_nr >= dwp_file->num_sections)
10378 error (_("Dwarf Error: bad DWP hash table, section number too large"
10379 " [in module %s]"),
10383 sectp = dwp_file->elf_sections[section_nr];
10384 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10386 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10387 " [in module %s]"),
10393 || dwarf2_section_empty_p (§ions.info_or_types)
10394 || dwarf2_section_empty_p (§ions.abbrev))
10396 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10397 " [in module %s]"),
10400 if (i == MAX_NR_V1_DWO_SECTIONS)
10402 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10403 " [in module %s]"),
10407 /* It's easier for the rest of the code if we fake a struct dwo_file and
10408 have dwo_unit "live" in that. At least for now.
10410 The DWP file can be made up of a random collection of CUs and TUs.
10411 However, for each CU + set of TUs that came from the same original DWO
10412 file, we can combine them back into a virtual DWO file to save space
10413 (fewer struct dwo_file objects to allocate). Remember that for really
10414 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10417 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10418 get_section_id (§ions.abbrev),
10419 get_section_id (§ions.line),
10420 get_section_id (§ions.loc),
10421 get_section_id (§ions.str_offsets));
10422 make_cleanup (xfree, virtual_dwo_name);
10423 /* Can we use an existing virtual DWO file? */
10424 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10425 /* Create one if necessary. */
10426 if (*dwo_file_slot == NULL)
10428 if (dwarf_read_debug)
10430 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10433 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10435 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10437 strlen (virtual_dwo_name));
10438 dwo_file->comp_dir = comp_dir;
10439 dwo_file->sections.abbrev = sections.abbrev;
10440 dwo_file->sections.line = sections.line;
10441 dwo_file->sections.loc = sections.loc;
10442 dwo_file->sections.macinfo = sections.macinfo;
10443 dwo_file->sections.macro = sections.macro;
10444 dwo_file->sections.str_offsets = sections.str_offsets;
10445 /* The "str" section is global to the entire DWP file. */
10446 dwo_file->sections.str = dwp_file->sections.str;
10447 /* The info or types section is assigned below to dwo_unit,
10448 there's no need to record it in dwo_file.
10449 Also, we can't simply record type sections in dwo_file because
10450 we record a pointer into the vector in dwo_unit. As we collect more
10451 types we'll grow the vector and eventually have to reallocate space
10452 for it, invalidating all copies of pointers into the previous
10454 *dwo_file_slot = dwo_file;
10458 if (dwarf_read_debug)
10460 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10463 dwo_file = (struct dwo_file *) *dwo_file_slot;
10465 do_cleanups (cleanups);
10467 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10468 dwo_unit->dwo_file = dwo_file;
10469 dwo_unit->signature = signature;
10470 dwo_unit->section =
10471 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10472 *dwo_unit->section = sections.info_or_types;
10473 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10478 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10479 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10480 piece within that section used by a TU/CU, return a virtual section
10481 of just that piece. */
10483 static struct dwarf2_section_info
10484 create_dwp_v2_section (struct dwarf2_section_info *section,
10485 bfd_size_type offset, bfd_size_type size)
10487 struct dwarf2_section_info result;
10490 gdb_assert (section != NULL);
10491 gdb_assert (!section->is_virtual);
10493 memset (&result, 0, sizeof (result));
10494 result.s.containing_section = section;
10495 result.is_virtual = 1;
10500 sectp = get_section_bfd_section (section);
10502 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10503 bounds of the real section. This is a pretty-rare event, so just
10504 flag an error (easier) instead of a warning and trying to cope. */
10506 || offset + size > bfd_get_section_size (sectp))
10508 bfd *abfd = sectp->owner;
10510 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10511 " in section %s [in module %s]"),
10512 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10513 objfile_name (dwarf2_per_objfile->objfile));
10516 result.virtual_offset = offset;
10517 result.size = size;
10521 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10522 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10523 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10524 This is for DWP version 2 files. */
10526 static struct dwo_unit *
10527 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10528 uint32_t unit_index,
10529 const char *comp_dir,
10530 ULONGEST signature, int is_debug_types)
10532 struct objfile *objfile = dwarf2_per_objfile->objfile;
10533 const struct dwp_hash_table *dwp_htab =
10534 is_debug_types ? dwp_file->tus : dwp_file->cus;
10535 bfd *dbfd = dwp_file->dbfd;
10536 const char *kind = is_debug_types ? "TU" : "CU";
10537 struct dwo_file *dwo_file;
10538 struct dwo_unit *dwo_unit;
10539 struct virtual_v2_dwo_sections sections;
10540 void **dwo_file_slot;
10541 char *virtual_dwo_name;
10542 struct cleanup *cleanups;
10545 gdb_assert (dwp_file->version == 2);
10547 if (dwarf_read_debug)
10549 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10551 pulongest (unit_index), hex_string (signature),
10555 /* Fetch the section offsets of this DWO unit. */
10557 memset (§ions, 0, sizeof (sections));
10558 cleanups = make_cleanup (null_cleanup, 0);
10560 for (i = 0; i < dwp_htab->nr_columns; ++i)
10562 uint32_t offset = read_4_bytes (dbfd,
10563 dwp_htab->section_pool.v2.offsets
10564 + (((unit_index - 1) * dwp_htab->nr_columns
10566 * sizeof (uint32_t)));
10567 uint32_t size = read_4_bytes (dbfd,
10568 dwp_htab->section_pool.v2.sizes
10569 + (((unit_index - 1) * dwp_htab->nr_columns
10571 * sizeof (uint32_t)));
10573 switch (dwp_htab->section_pool.v2.section_ids[i])
10576 case DW_SECT_TYPES:
10577 sections.info_or_types_offset = offset;
10578 sections.info_or_types_size = size;
10580 case DW_SECT_ABBREV:
10581 sections.abbrev_offset = offset;
10582 sections.abbrev_size = size;
10585 sections.line_offset = offset;
10586 sections.line_size = size;
10589 sections.loc_offset = offset;
10590 sections.loc_size = size;
10592 case DW_SECT_STR_OFFSETS:
10593 sections.str_offsets_offset = offset;
10594 sections.str_offsets_size = size;
10596 case DW_SECT_MACINFO:
10597 sections.macinfo_offset = offset;
10598 sections.macinfo_size = size;
10600 case DW_SECT_MACRO:
10601 sections.macro_offset = offset;
10602 sections.macro_size = size;
10607 /* It's easier for the rest of the code if we fake a struct dwo_file and
10608 have dwo_unit "live" in that. At least for now.
10610 The DWP file can be made up of a random collection of CUs and TUs.
10611 However, for each CU + set of TUs that came from the same original DWO
10612 file, we can combine them back into a virtual DWO file to save space
10613 (fewer struct dwo_file objects to allocate). Remember that for really
10614 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10617 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10618 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10619 (long) (sections.line_size ? sections.line_offset : 0),
10620 (long) (sections.loc_size ? sections.loc_offset : 0),
10621 (long) (sections.str_offsets_size
10622 ? sections.str_offsets_offset : 0));
10623 make_cleanup (xfree, virtual_dwo_name);
10624 /* Can we use an existing virtual DWO file? */
10625 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10626 /* Create one if necessary. */
10627 if (*dwo_file_slot == NULL)
10629 if (dwarf_read_debug)
10631 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10634 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10636 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10638 strlen (virtual_dwo_name));
10639 dwo_file->comp_dir = comp_dir;
10640 dwo_file->sections.abbrev =
10641 create_dwp_v2_section (&dwp_file->sections.abbrev,
10642 sections.abbrev_offset, sections.abbrev_size);
10643 dwo_file->sections.line =
10644 create_dwp_v2_section (&dwp_file->sections.line,
10645 sections.line_offset, sections.line_size);
10646 dwo_file->sections.loc =
10647 create_dwp_v2_section (&dwp_file->sections.loc,
10648 sections.loc_offset, sections.loc_size);
10649 dwo_file->sections.macinfo =
10650 create_dwp_v2_section (&dwp_file->sections.macinfo,
10651 sections.macinfo_offset, sections.macinfo_size);
10652 dwo_file->sections.macro =
10653 create_dwp_v2_section (&dwp_file->sections.macro,
10654 sections.macro_offset, sections.macro_size);
10655 dwo_file->sections.str_offsets =
10656 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10657 sections.str_offsets_offset,
10658 sections.str_offsets_size);
10659 /* The "str" section is global to the entire DWP file. */
10660 dwo_file->sections.str = dwp_file->sections.str;
10661 /* The info or types section is assigned below to dwo_unit,
10662 there's no need to record it in dwo_file.
10663 Also, we can't simply record type sections in dwo_file because
10664 we record a pointer into the vector in dwo_unit. As we collect more
10665 types we'll grow the vector and eventually have to reallocate space
10666 for it, invalidating all copies of pointers into the previous
10668 *dwo_file_slot = dwo_file;
10672 if (dwarf_read_debug)
10674 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10677 dwo_file = (struct dwo_file *) *dwo_file_slot;
10679 do_cleanups (cleanups);
10681 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10682 dwo_unit->dwo_file = dwo_file;
10683 dwo_unit->signature = signature;
10684 dwo_unit->section =
10685 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10686 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10687 ? &dwp_file->sections.types
10688 : &dwp_file->sections.info,
10689 sections.info_or_types_offset,
10690 sections.info_or_types_size);
10691 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10696 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10697 Returns NULL if the signature isn't found. */
10699 static struct dwo_unit *
10700 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10701 ULONGEST signature, int is_debug_types)
10703 const struct dwp_hash_table *dwp_htab =
10704 is_debug_types ? dwp_file->tus : dwp_file->cus;
10705 bfd *dbfd = dwp_file->dbfd;
10706 uint32_t mask = dwp_htab->nr_slots - 1;
10707 uint32_t hash = signature & mask;
10708 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10711 struct dwo_unit find_dwo_cu;
10713 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10714 find_dwo_cu.signature = signature;
10715 slot = htab_find_slot (is_debug_types
10716 ? dwp_file->loaded_tus
10717 : dwp_file->loaded_cus,
10718 &find_dwo_cu, INSERT);
10721 return (struct dwo_unit *) *slot;
10723 /* Use a for loop so that we don't loop forever on bad debug info. */
10724 for (i = 0; i < dwp_htab->nr_slots; ++i)
10726 ULONGEST signature_in_table;
10728 signature_in_table =
10729 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10730 if (signature_in_table == signature)
10732 uint32_t unit_index =
10733 read_4_bytes (dbfd,
10734 dwp_htab->unit_table + hash * sizeof (uint32_t));
10736 if (dwp_file->version == 1)
10738 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10739 comp_dir, signature,
10744 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10745 comp_dir, signature,
10748 return (struct dwo_unit *) *slot;
10750 if (signature_in_table == 0)
10752 hash = (hash + hash2) & mask;
10755 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10756 " [in module %s]"),
10760 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10761 Open the file specified by FILE_NAME and hand it off to BFD for
10762 preliminary analysis. Return a newly initialized bfd *, which
10763 includes a canonicalized copy of FILE_NAME.
10764 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10765 SEARCH_CWD is true if the current directory is to be searched.
10766 It will be searched before debug-file-directory.
10767 If successful, the file is added to the bfd include table of the
10768 objfile's bfd (see gdb_bfd_record_inclusion).
10769 If unable to find/open the file, return NULL.
10770 NOTE: This function is derived from symfile_bfd_open. */
10772 static gdb_bfd_ref_ptr
10773 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10776 char *absolute_name;
10777 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10778 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10779 to debug_file_directory. */
10781 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10785 if (*debug_file_directory != '\0')
10786 search_path = concat (".", dirname_separator_string,
10787 debug_file_directory, (char *) NULL);
10789 search_path = xstrdup (".");
10792 search_path = xstrdup (debug_file_directory);
10794 flags = OPF_RETURN_REALPATH;
10796 flags |= OPF_SEARCH_IN_PATH;
10797 desc = openp (search_path, flags, file_name,
10798 O_RDONLY | O_BINARY, &absolute_name);
10799 xfree (search_path);
10803 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
10804 xfree (absolute_name);
10805 if (sym_bfd == NULL)
10807 bfd_set_cacheable (sym_bfd.get (), 1);
10809 if (!bfd_check_format (sym_bfd.get (), bfd_object))
10812 /* Success. Record the bfd as having been included by the objfile's bfd.
10813 This is important because things like demangled_names_hash lives in the
10814 objfile's per_bfd space and may have references to things like symbol
10815 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10816 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
10821 /* Try to open DWO file FILE_NAME.
10822 COMP_DIR is the DW_AT_comp_dir attribute.
10823 The result is the bfd handle of the file.
10824 If there is a problem finding or opening the file, return NULL.
10825 Upon success, the canonicalized path of the file is stored in the bfd,
10826 same as symfile_bfd_open. */
10828 static gdb_bfd_ref_ptr
10829 open_dwo_file (const char *file_name, const char *comp_dir)
10831 if (IS_ABSOLUTE_PATH (file_name))
10832 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10834 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10836 if (comp_dir != NULL)
10838 char *path_to_try = concat (comp_dir, SLASH_STRING,
10839 file_name, (char *) NULL);
10841 /* NOTE: If comp_dir is a relative path, this will also try the
10842 search path, which seems useful. */
10843 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
10844 1 /*search_cwd*/));
10845 xfree (path_to_try);
10850 /* That didn't work, try debug-file-directory, which, despite its name,
10851 is a list of paths. */
10853 if (*debug_file_directory == '\0')
10856 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10859 /* This function is mapped across the sections and remembers the offset and
10860 size of each of the DWO debugging sections we are interested in. */
10863 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10865 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10866 const struct dwop_section_names *names = &dwop_section_names;
10868 if (section_is_p (sectp->name, &names->abbrev_dwo))
10870 dwo_sections->abbrev.s.section = sectp;
10871 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10873 else if (section_is_p (sectp->name, &names->info_dwo))
10875 dwo_sections->info.s.section = sectp;
10876 dwo_sections->info.size = bfd_get_section_size (sectp);
10878 else if (section_is_p (sectp->name, &names->line_dwo))
10880 dwo_sections->line.s.section = sectp;
10881 dwo_sections->line.size = bfd_get_section_size (sectp);
10883 else if (section_is_p (sectp->name, &names->loc_dwo))
10885 dwo_sections->loc.s.section = sectp;
10886 dwo_sections->loc.size = bfd_get_section_size (sectp);
10888 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10890 dwo_sections->macinfo.s.section = sectp;
10891 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10893 else if (section_is_p (sectp->name, &names->macro_dwo))
10895 dwo_sections->macro.s.section = sectp;
10896 dwo_sections->macro.size = bfd_get_section_size (sectp);
10898 else if (section_is_p (sectp->name, &names->str_dwo))
10900 dwo_sections->str.s.section = sectp;
10901 dwo_sections->str.size = bfd_get_section_size (sectp);
10903 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10905 dwo_sections->str_offsets.s.section = sectp;
10906 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10908 else if (section_is_p (sectp->name, &names->types_dwo))
10910 struct dwarf2_section_info type_section;
10912 memset (&type_section, 0, sizeof (type_section));
10913 type_section.s.section = sectp;
10914 type_section.size = bfd_get_section_size (sectp);
10915 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10920 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10921 by PER_CU. This is for the non-DWP case.
10922 The result is NULL if DWO_NAME can't be found. */
10924 static struct dwo_file *
10925 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10926 const char *dwo_name, const char *comp_dir)
10928 struct objfile *objfile = dwarf2_per_objfile->objfile;
10929 struct dwo_file *dwo_file;
10930 struct cleanup *cleanups;
10932 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
10935 if (dwarf_read_debug)
10936 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10939 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10940 dwo_file->dwo_name = dwo_name;
10941 dwo_file->comp_dir = comp_dir;
10942 dwo_file->dbfd = dbfd.release ();
10944 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10946 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
10947 &dwo_file->sections);
10949 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
10951 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
10954 discard_cleanups (cleanups);
10956 if (dwarf_read_debug)
10957 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10962 /* This function is mapped across the sections and remembers the offset and
10963 size of each of the DWP debugging sections common to version 1 and 2 that
10964 we are interested in. */
10967 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10968 void *dwp_file_ptr)
10970 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10971 const struct dwop_section_names *names = &dwop_section_names;
10972 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10974 /* Record the ELF section number for later lookup: this is what the
10975 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10976 gdb_assert (elf_section_nr < dwp_file->num_sections);
10977 dwp_file->elf_sections[elf_section_nr] = sectp;
10979 /* Look for specific sections that we need. */
10980 if (section_is_p (sectp->name, &names->str_dwo))
10982 dwp_file->sections.str.s.section = sectp;
10983 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10985 else if (section_is_p (sectp->name, &names->cu_index))
10987 dwp_file->sections.cu_index.s.section = sectp;
10988 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10990 else if (section_is_p (sectp->name, &names->tu_index))
10992 dwp_file->sections.tu_index.s.section = sectp;
10993 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10997 /* This function is mapped across the sections and remembers the offset and
10998 size of each of the DWP version 2 debugging sections that we are interested
10999 in. This is split into a separate function because we don't know if we
11000 have version 1 or 2 until we parse the cu_index/tu_index sections. */
11003 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
11005 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11006 const struct dwop_section_names *names = &dwop_section_names;
11007 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11009 /* Record the ELF section number for later lookup: this is what the
11010 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11011 gdb_assert (elf_section_nr < dwp_file->num_sections);
11012 dwp_file->elf_sections[elf_section_nr] = sectp;
11014 /* Look for specific sections that we need. */
11015 if (section_is_p (sectp->name, &names->abbrev_dwo))
11017 dwp_file->sections.abbrev.s.section = sectp;
11018 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
11020 else if (section_is_p (sectp->name, &names->info_dwo))
11022 dwp_file->sections.info.s.section = sectp;
11023 dwp_file->sections.info.size = bfd_get_section_size (sectp);
11025 else if (section_is_p (sectp->name, &names->line_dwo))
11027 dwp_file->sections.line.s.section = sectp;
11028 dwp_file->sections.line.size = bfd_get_section_size (sectp);
11030 else if (section_is_p (sectp->name, &names->loc_dwo))
11032 dwp_file->sections.loc.s.section = sectp;
11033 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
11035 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11037 dwp_file->sections.macinfo.s.section = sectp;
11038 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
11040 else if (section_is_p (sectp->name, &names->macro_dwo))
11042 dwp_file->sections.macro.s.section = sectp;
11043 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
11045 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11047 dwp_file->sections.str_offsets.s.section = sectp;
11048 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
11050 else if (section_is_p (sectp->name, &names->types_dwo))
11052 dwp_file->sections.types.s.section = sectp;
11053 dwp_file->sections.types.size = bfd_get_section_size (sectp);
11057 /* Hash function for dwp_file loaded CUs/TUs. */
11060 hash_dwp_loaded_cutus (const void *item)
11062 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11064 /* This drops the top 32 bits of the signature, but is ok for a hash. */
11065 return dwo_unit->signature;
11068 /* Equality function for dwp_file loaded CUs/TUs. */
11071 eq_dwp_loaded_cutus (const void *a, const void *b)
11073 const struct dwo_unit *dua = (const struct dwo_unit *) a;
11074 const struct dwo_unit *dub = (const struct dwo_unit *) b;
11076 return dua->signature == dub->signature;
11079 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
11082 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
11084 return htab_create_alloc_ex (3,
11085 hash_dwp_loaded_cutus,
11086 eq_dwp_loaded_cutus,
11088 &objfile->objfile_obstack,
11089 hashtab_obstack_allocate,
11090 dummy_obstack_deallocate);
11093 /* Try to open DWP file FILE_NAME.
11094 The result is the bfd handle of the file.
11095 If there is a problem finding or opening the file, return NULL.
11096 Upon success, the canonicalized path of the file is stored in the bfd,
11097 same as symfile_bfd_open. */
11099 static gdb_bfd_ref_ptr
11100 open_dwp_file (const char *file_name)
11102 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
11103 1 /*search_cwd*/));
11107 /* Work around upstream bug 15652.
11108 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11109 [Whether that's a "bug" is debatable, but it is getting in our way.]
11110 We have no real idea where the dwp file is, because gdb's realpath-ing
11111 of the executable's path may have discarded the needed info.
11112 [IWBN if the dwp file name was recorded in the executable, akin to
11113 .gnu_debuglink, but that doesn't exist yet.]
11114 Strip the directory from FILE_NAME and search again. */
11115 if (*debug_file_directory != '\0')
11117 /* Don't implicitly search the current directory here.
11118 If the user wants to search "." to handle this case,
11119 it must be added to debug-file-directory. */
11120 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11127 /* Initialize the use of the DWP file for the current objfile.
11128 By convention the name of the DWP file is ${objfile}.dwp.
11129 The result is NULL if it can't be found. */
11131 static struct dwp_file *
11132 open_and_init_dwp_file (void)
11134 struct objfile *objfile = dwarf2_per_objfile->objfile;
11135 struct dwp_file *dwp_file;
11137 /* Try to find first .dwp for the binary file before any symbolic links
11140 /* If the objfile is a debug file, find the name of the real binary
11141 file and get the name of dwp file from there. */
11142 std::string dwp_name;
11143 if (objfile->separate_debug_objfile_backlink != NULL)
11145 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11146 const char *backlink_basename = lbasename (backlink->original_name);
11148 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11151 dwp_name = objfile->original_name;
11153 dwp_name += ".dwp";
11155 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
11157 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
11159 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
11160 dwp_name = objfile_name (objfile);
11161 dwp_name += ".dwp";
11162 dbfd = open_dwp_file (dwp_name.c_str ());
11167 if (dwarf_read_debug)
11168 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11171 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11172 dwp_file->name = bfd_get_filename (dbfd.get ());
11173 dwp_file->dbfd = dbfd.release ();
11175 /* +1: section 0 is unused */
11176 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11177 dwp_file->elf_sections =
11178 OBSTACK_CALLOC (&objfile->objfile_obstack,
11179 dwp_file->num_sections, asection *);
11181 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11184 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11186 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11188 /* The DWP file version is stored in the hash table. Oh well. */
11189 if (dwp_file->cus->version != dwp_file->tus->version)
11191 /* Technically speaking, we should try to limp along, but this is
11192 pretty bizarre. We use pulongest here because that's the established
11193 portability solution (e.g, we cannot use %u for uint32_t). */
11194 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11195 " TU version %s [in DWP file %s]"),
11196 pulongest (dwp_file->cus->version),
11197 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11199 dwp_file->version = dwp_file->cus->version;
11201 if (dwp_file->version == 2)
11202 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11205 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11206 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11208 if (dwarf_read_debug)
11210 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11211 fprintf_unfiltered (gdb_stdlog,
11212 " %s CUs, %s TUs\n",
11213 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11214 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11220 /* Wrapper around open_and_init_dwp_file, only open it once. */
11222 static struct dwp_file *
11223 get_dwp_file (void)
11225 if (! dwarf2_per_objfile->dwp_checked)
11227 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11228 dwarf2_per_objfile->dwp_checked = 1;
11230 return dwarf2_per_objfile->dwp_file;
11233 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11234 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11235 or in the DWP file for the objfile, referenced by THIS_UNIT.
11236 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11237 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11239 This is called, for example, when wanting to read a variable with a
11240 complex location. Therefore we don't want to do file i/o for every call.
11241 Therefore we don't want to look for a DWO file on every call.
11242 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11243 then we check if we've already seen DWO_NAME, and only THEN do we check
11246 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11247 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11249 static struct dwo_unit *
11250 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11251 const char *dwo_name, const char *comp_dir,
11252 ULONGEST signature, int is_debug_types)
11254 struct objfile *objfile = dwarf2_per_objfile->objfile;
11255 const char *kind = is_debug_types ? "TU" : "CU";
11256 void **dwo_file_slot;
11257 struct dwo_file *dwo_file;
11258 struct dwp_file *dwp_file;
11260 /* First see if there's a DWP file.
11261 If we have a DWP file but didn't find the DWO inside it, don't
11262 look for the original DWO file. It makes gdb behave differently
11263 depending on whether one is debugging in the build tree. */
11265 dwp_file = get_dwp_file ();
11266 if (dwp_file != NULL)
11268 const struct dwp_hash_table *dwp_htab =
11269 is_debug_types ? dwp_file->tus : dwp_file->cus;
11271 if (dwp_htab != NULL)
11273 struct dwo_unit *dwo_cutu =
11274 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11275 signature, is_debug_types);
11277 if (dwo_cutu != NULL)
11279 if (dwarf_read_debug)
11281 fprintf_unfiltered (gdb_stdlog,
11282 "Virtual DWO %s %s found: @%s\n",
11283 kind, hex_string (signature),
11284 host_address_to_string (dwo_cutu));
11292 /* No DWP file, look for the DWO file. */
11294 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11295 if (*dwo_file_slot == NULL)
11297 /* Read in the file and build a table of the CUs/TUs it contains. */
11298 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11300 /* NOTE: This will be NULL if unable to open the file. */
11301 dwo_file = (struct dwo_file *) *dwo_file_slot;
11303 if (dwo_file != NULL)
11305 struct dwo_unit *dwo_cutu = NULL;
11307 if (is_debug_types && dwo_file->tus)
11309 struct dwo_unit find_dwo_cutu;
11311 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11312 find_dwo_cutu.signature = signature;
11314 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11316 else if (!is_debug_types && dwo_file->cus)
11318 struct dwo_unit find_dwo_cutu;
11320 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11321 find_dwo_cutu.signature = signature;
11322 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
11326 if (dwo_cutu != NULL)
11328 if (dwarf_read_debug)
11330 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11331 kind, dwo_name, hex_string (signature),
11332 host_address_to_string (dwo_cutu));
11339 /* We didn't find it. This could mean a dwo_id mismatch, or
11340 someone deleted the DWO/DWP file, or the search path isn't set up
11341 correctly to find the file. */
11343 if (dwarf_read_debug)
11345 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11346 kind, dwo_name, hex_string (signature));
11349 /* This is a warning and not a complaint because it can be caused by
11350 pilot error (e.g., user accidentally deleting the DWO). */
11352 /* Print the name of the DWP file if we looked there, helps the user
11353 better diagnose the problem. */
11354 char *dwp_text = NULL;
11355 struct cleanup *cleanups;
11357 if (dwp_file != NULL)
11358 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11359 cleanups = make_cleanup (xfree, dwp_text);
11361 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11362 " [in module %s]"),
11363 kind, dwo_name, hex_string (signature),
11364 dwp_text != NULL ? dwp_text : "",
11365 this_unit->is_debug_types ? "TU" : "CU",
11366 to_underlying (this_unit->sect_off), objfile_name (objfile));
11368 do_cleanups (cleanups);
11373 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11374 See lookup_dwo_cutu_unit for details. */
11376 static struct dwo_unit *
11377 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11378 const char *dwo_name, const char *comp_dir,
11379 ULONGEST signature)
11381 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11384 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11385 See lookup_dwo_cutu_unit for details. */
11387 static struct dwo_unit *
11388 lookup_dwo_type_unit (struct signatured_type *this_tu,
11389 const char *dwo_name, const char *comp_dir)
11391 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11394 /* Traversal function for queue_and_load_all_dwo_tus. */
11397 queue_and_load_dwo_tu (void **slot, void *info)
11399 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11400 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11401 ULONGEST signature = dwo_unit->signature;
11402 struct signatured_type *sig_type =
11403 lookup_dwo_signatured_type (per_cu->cu, signature);
11405 if (sig_type != NULL)
11407 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11409 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11410 a real dependency of PER_CU on SIG_TYPE. That is detected later
11411 while processing PER_CU. */
11412 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11413 load_full_type_unit (sig_cu);
11414 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11420 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11421 The DWO may have the only definition of the type, though it may not be
11422 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11423 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11426 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11428 struct dwo_unit *dwo_unit;
11429 struct dwo_file *dwo_file;
11431 gdb_assert (!per_cu->is_debug_types);
11432 gdb_assert (get_dwp_file () == NULL);
11433 gdb_assert (per_cu->cu != NULL);
11435 dwo_unit = per_cu->cu->dwo_unit;
11436 gdb_assert (dwo_unit != NULL);
11438 dwo_file = dwo_unit->dwo_file;
11439 if (dwo_file->tus != NULL)
11440 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11443 /* Free all resources associated with DWO_FILE.
11444 Close the DWO file and munmap the sections.
11445 All memory should be on the objfile obstack. */
11448 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11451 /* Note: dbfd is NULL for virtual DWO files. */
11452 gdb_bfd_unref (dwo_file->dbfd);
11454 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11457 /* Wrapper for free_dwo_file for use in cleanups. */
11460 free_dwo_file_cleanup (void *arg)
11462 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11463 struct objfile *objfile = dwarf2_per_objfile->objfile;
11465 free_dwo_file (dwo_file, objfile);
11468 /* Traversal function for free_dwo_files. */
11471 free_dwo_file_from_slot (void **slot, void *info)
11473 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11474 struct objfile *objfile = (struct objfile *) info;
11476 free_dwo_file (dwo_file, objfile);
11481 /* Free all resources associated with DWO_FILES. */
11484 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11486 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11489 /* Read in various DIEs. */
11491 /* qsort helper for inherit_abstract_dies. */
11494 unsigned_int_compar (const void *ap, const void *bp)
11496 unsigned int a = *(unsigned int *) ap;
11497 unsigned int b = *(unsigned int *) bp;
11499 return (a > b) - (b > a);
11502 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11503 Inherit only the children of the DW_AT_abstract_origin DIE not being
11504 already referenced by DW_AT_abstract_origin from the children of the
11508 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11510 struct die_info *child_die;
11511 unsigned die_children_count;
11512 /* CU offsets which were referenced by children of the current DIE. */
11513 sect_offset *offsets;
11514 sect_offset *offsets_end, *offsetp;
11515 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11516 struct die_info *origin_die;
11517 /* Iterator of the ORIGIN_DIE children. */
11518 struct die_info *origin_child_die;
11519 struct cleanup *cleanups;
11520 struct attribute *attr;
11521 struct dwarf2_cu *origin_cu;
11522 struct pending **origin_previous_list_in_scope;
11524 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11528 /* Note that following die references may follow to a die in a
11532 origin_die = follow_die_ref (die, attr, &origin_cu);
11534 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11536 origin_previous_list_in_scope = origin_cu->list_in_scope;
11537 origin_cu->list_in_scope = cu->list_in_scope;
11539 if (die->tag != origin_die->tag
11540 && !(die->tag == DW_TAG_inlined_subroutine
11541 && origin_die->tag == DW_TAG_subprogram))
11542 complaint (&symfile_complaints,
11543 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11544 to_underlying (die->sect_off),
11545 to_underlying (origin_die->sect_off));
11547 child_die = die->child;
11548 die_children_count = 0;
11549 while (child_die && child_die->tag)
11551 child_die = sibling_die (child_die);
11552 die_children_count++;
11554 offsets = XNEWVEC (sect_offset, die_children_count);
11555 cleanups = make_cleanup (xfree, offsets);
11557 offsets_end = offsets;
11558 for (child_die = die->child;
11559 child_die && child_die->tag;
11560 child_die = sibling_die (child_die))
11562 struct die_info *child_origin_die;
11563 struct dwarf2_cu *child_origin_cu;
11565 /* We are trying to process concrete instance entries:
11566 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11567 it's not relevant to our analysis here. i.e. detecting DIEs that are
11568 present in the abstract instance but not referenced in the concrete
11570 if (child_die->tag == DW_TAG_call_site
11571 || child_die->tag == DW_TAG_GNU_call_site)
11574 /* For each CHILD_DIE, find the corresponding child of
11575 ORIGIN_DIE. If there is more than one layer of
11576 DW_AT_abstract_origin, follow them all; there shouldn't be,
11577 but GCC versions at least through 4.4 generate this (GCC PR
11579 child_origin_die = child_die;
11580 child_origin_cu = cu;
11583 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11587 child_origin_die = follow_die_ref (child_origin_die, attr,
11591 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11592 counterpart may exist. */
11593 if (child_origin_die != child_die)
11595 if (child_die->tag != child_origin_die->tag
11596 && !(child_die->tag == DW_TAG_inlined_subroutine
11597 && child_origin_die->tag == DW_TAG_subprogram))
11598 complaint (&symfile_complaints,
11599 _("Child DIE 0x%x and its abstract origin 0x%x have "
11601 to_underlying (child_die->sect_off),
11602 to_underlying (child_origin_die->sect_off));
11603 if (child_origin_die->parent != origin_die)
11604 complaint (&symfile_complaints,
11605 _("Child DIE 0x%x and its abstract origin 0x%x have "
11606 "different parents"),
11607 to_underlying (child_die->sect_off),
11608 to_underlying (child_origin_die->sect_off));
11610 *offsets_end++ = child_origin_die->sect_off;
11613 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11614 unsigned_int_compar);
11615 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11616 if (offsetp[-1] == *offsetp)
11617 complaint (&symfile_complaints,
11618 _("Multiple children of DIE 0x%x refer "
11619 "to DIE 0x%x as their abstract origin"),
11620 to_underlying (die->sect_off), to_underlying (*offsetp));
11623 origin_child_die = origin_die->child;
11624 while (origin_child_die && origin_child_die->tag)
11626 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11627 while (offsetp < offsets_end
11628 && *offsetp < origin_child_die->sect_off)
11630 if (offsetp >= offsets_end
11631 || *offsetp > origin_child_die->sect_off)
11633 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11634 Check whether we're already processing ORIGIN_CHILD_DIE.
11635 This can happen with mutually referenced abstract_origins.
11637 if (!origin_child_die->in_process)
11638 process_die (origin_child_die, origin_cu);
11640 origin_child_die = sibling_die (origin_child_die);
11642 origin_cu->list_in_scope = origin_previous_list_in_scope;
11644 do_cleanups (cleanups);
11648 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11650 struct objfile *objfile = cu->objfile;
11651 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11652 struct context_stack *newobj;
11655 struct die_info *child_die;
11656 struct attribute *attr, *call_line, *call_file;
11658 CORE_ADDR baseaddr;
11659 struct block *block;
11660 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11661 VEC (symbolp) *template_args = NULL;
11662 struct template_symbol *templ_func = NULL;
11666 /* If we do not have call site information, we can't show the
11667 caller of this inlined function. That's too confusing, so
11668 only use the scope for local variables. */
11669 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11670 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11671 if (call_line == NULL || call_file == NULL)
11673 read_lexical_block_scope (die, cu);
11678 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11680 name = dwarf2_name (die, cu);
11682 /* Ignore functions with missing or empty names. These are actually
11683 illegal according to the DWARF standard. */
11686 complaint (&symfile_complaints,
11687 _("missing name for subprogram DIE at %d"),
11688 to_underlying (die->sect_off));
11692 /* Ignore functions with missing or invalid low and high pc attributes. */
11693 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11694 <= PC_BOUNDS_INVALID)
11696 attr = dwarf2_attr (die, DW_AT_external, cu);
11697 if (!attr || !DW_UNSND (attr))
11698 complaint (&symfile_complaints,
11699 _("cannot get low and high bounds "
11700 "for subprogram DIE at %d"),
11701 to_underlying (die->sect_off));
11705 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11706 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11708 /* If we have any template arguments, then we must allocate a
11709 different sort of symbol. */
11710 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11712 if (child_die->tag == DW_TAG_template_type_param
11713 || child_die->tag == DW_TAG_template_value_param)
11715 templ_func = allocate_template_symbol (objfile);
11716 templ_func->base.is_cplus_template_function = 1;
11721 newobj = push_context (0, lowpc);
11722 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11723 (struct symbol *) templ_func);
11725 /* If there is a location expression for DW_AT_frame_base, record
11727 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11729 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11731 /* If there is a location for the static link, record it. */
11732 newobj->static_link = NULL;
11733 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11736 newobj->static_link
11737 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11738 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11741 cu->list_in_scope = &local_symbols;
11743 if (die->child != NULL)
11745 child_die = die->child;
11746 while (child_die && child_die->tag)
11748 if (child_die->tag == DW_TAG_template_type_param
11749 || child_die->tag == DW_TAG_template_value_param)
11751 struct symbol *arg = new_symbol (child_die, NULL, cu);
11754 VEC_safe_push (symbolp, template_args, arg);
11757 process_die (child_die, cu);
11758 child_die = sibling_die (child_die);
11762 inherit_abstract_dies (die, cu);
11764 /* If we have a DW_AT_specification, we might need to import using
11765 directives from the context of the specification DIE. See the
11766 comment in determine_prefix. */
11767 if (cu->language == language_cplus
11768 && dwarf2_attr (die, DW_AT_specification, cu))
11770 struct dwarf2_cu *spec_cu = cu;
11771 struct die_info *spec_die = die_specification (die, &spec_cu);
11775 child_die = spec_die->child;
11776 while (child_die && child_die->tag)
11778 if (child_die->tag == DW_TAG_imported_module)
11779 process_die (child_die, spec_cu);
11780 child_die = sibling_die (child_die);
11783 /* In some cases, GCC generates specification DIEs that
11784 themselves contain DW_AT_specification attributes. */
11785 spec_die = die_specification (spec_die, &spec_cu);
11789 newobj = pop_context ();
11790 /* Make a block for the local symbols within. */
11791 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11792 newobj->static_link, lowpc, highpc);
11794 /* For C++, set the block's scope. */
11795 if ((cu->language == language_cplus
11796 || cu->language == language_fortran
11797 || cu->language == language_d
11798 || cu->language == language_rust)
11799 && cu->processing_has_namespace_info)
11800 block_set_scope (block, determine_prefix (die, cu),
11801 &objfile->objfile_obstack);
11803 /* If we have address ranges, record them. */
11804 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11806 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11808 /* Attach template arguments to function. */
11809 if (! VEC_empty (symbolp, template_args))
11811 gdb_assert (templ_func != NULL);
11813 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11814 templ_func->template_arguments
11815 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11816 templ_func->n_template_arguments);
11817 memcpy (templ_func->template_arguments,
11818 VEC_address (symbolp, template_args),
11819 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11820 VEC_free (symbolp, template_args);
11823 /* In C++, we can have functions nested inside functions (e.g., when
11824 a function declares a class that has methods). This means that
11825 when we finish processing a function scope, we may need to go
11826 back to building a containing block's symbol lists. */
11827 local_symbols = newobj->locals;
11828 local_using_directives = newobj->local_using_directives;
11830 /* If we've finished processing a top-level function, subsequent
11831 symbols go in the file symbol list. */
11832 if (outermost_context_p ())
11833 cu->list_in_scope = &file_symbols;
11836 /* Process all the DIES contained within a lexical block scope. Start
11837 a new scope, process the dies, and then close the scope. */
11840 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11842 struct objfile *objfile = cu->objfile;
11843 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11844 struct context_stack *newobj;
11845 CORE_ADDR lowpc, highpc;
11846 struct die_info *child_die;
11847 CORE_ADDR baseaddr;
11849 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11851 /* Ignore blocks with missing or invalid low and high pc attributes. */
11852 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11853 as multiple lexical blocks? Handling children in a sane way would
11854 be nasty. Might be easier to properly extend generic blocks to
11855 describe ranges. */
11856 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11858 case PC_BOUNDS_NOT_PRESENT:
11859 /* DW_TAG_lexical_block has no attributes, process its children as if
11860 there was no wrapping by that DW_TAG_lexical_block.
11861 GCC does no longer produces such DWARF since GCC r224161. */
11862 for (child_die = die->child;
11863 child_die != NULL && child_die->tag;
11864 child_die = sibling_die (child_die))
11865 process_die (child_die, cu);
11867 case PC_BOUNDS_INVALID:
11870 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11871 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11873 push_context (0, lowpc);
11874 if (die->child != NULL)
11876 child_die = die->child;
11877 while (child_die && child_die->tag)
11879 process_die (child_die, cu);
11880 child_die = sibling_die (child_die);
11883 inherit_abstract_dies (die, cu);
11884 newobj = pop_context ();
11886 if (local_symbols != NULL || local_using_directives != NULL)
11888 struct block *block
11889 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11890 newobj->start_addr, highpc);
11892 /* Note that recording ranges after traversing children, as we
11893 do here, means that recording a parent's ranges entails
11894 walking across all its children's ranges as they appear in
11895 the address map, which is quadratic behavior.
11897 It would be nicer to record the parent's ranges before
11898 traversing its children, simply overriding whatever you find
11899 there. But since we don't even decide whether to create a
11900 block until after we've traversed its children, that's hard
11902 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11904 local_symbols = newobj->locals;
11905 local_using_directives = newobj->local_using_directives;
11908 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
11911 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11913 struct objfile *objfile = cu->objfile;
11914 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11915 CORE_ADDR pc, baseaddr;
11916 struct attribute *attr;
11917 struct call_site *call_site, call_site_local;
11920 struct die_info *child_die;
11922 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11924 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
11927 /* This was a pre-DWARF-5 GNU extension alias
11928 for DW_AT_call_return_pc. */
11929 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11933 complaint (&symfile_complaints,
11934 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
11935 "DIE 0x%x [in module %s]"),
11936 to_underlying (die->sect_off), objfile_name (objfile));
11939 pc = attr_value_as_address (attr) + baseaddr;
11940 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11942 if (cu->call_site_htab == NULL)
11943 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11944 NULL, &objfile->objfile_obstack,
11945 hashtab_obstack_allocate, NULL);
11946 call_site_local.pc = pc;
11947 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11950 complaint (&symfile_complaints,
11951 _("Duplicate PC %s for DW_TAG_call_site "
11952 "DIE 0x%x [in module %s]"),
11953 paddress (gdbarch, pc), to_underlying (die->sect_off),
11954 objfile_name (objfile));
11958 /* Count parameters at the caller. */
11961 for (child_die = die->child; child_die && child_die->tag;
11962 child_die = sibling_die (child_die))
11964 if (child_die->tag != DW_TAG_call_site_parameter
11965 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11967 complaint (&symfile_complaints,
11968 _("Tag %d is not DW_TAG_call_site_parameter in "
11969 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11970 child_die->tag, to_underlying (child_die->sect_off),
11971 objfile_name (objfile));
11979 = ((struct call_site *)
11980 obstack_alloc (&objfile->objfile_obstack,
11981 sizeof (*call_site)
11982 + (sizeof (*call_site->parameter) * (nparams - 1))));
11984 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11985 call_site->pc = pc;
11987 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
11988 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11990 struct die_info *func_die;
11992 /* Skip also over DW_TAG_inlined_subroutine. */
11993 for (func_die = die->parent;
11994 func_die && func_die->tag != DW_TAG_subprogram
11995 && func_die->tag != DW_TAG_subroutine_type;
11996 func_die = func_die->parent);
11998 /* DW_AT_call_all_calls is a superset
11999 of DW_AT_call_all_tail_calls. */
12001 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
12002 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
12003 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
12004 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
12006 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
12007 not complete. But keep CALL_SITE for look ups via call_site_htab,
12008 both the initial caller containing the real return address PC and
12009 the final callee containing the current PC of a chain of tail
12010 calls do not need to have the tail call list complete. But any
12011 function candidate for a virtual tail call frame searched via
12012 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
12013 determined unambiguously. */
12017 struct type *func_type = NULL;
12020 func_type = get_die_type (func_die, cu);
12021 if (func_type != NULL)
12023 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
12025 /* Enlist this call site to the function. */
12026 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
12027 TYPE_TAIL_CALL_LIST (func_type) = call_site;
12030 complaint (&symfile_complaints,
12031 _("Cannot find function owning DW_TAG_call_site "
12032 "DIE 0x%x [in module %s]"),
12033 to_underlying (die->sect_off), objfile_name (objfile));
12037 attr = dwarf2_attr (die, DW_AT_call_target, cu);
12039 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
12041 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
12044 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
12045 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12047 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
12048 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
12049 /* Keep NULL DWARF_BLOCK. */;
12050 else if (attr_form_is_block (attr))
12052 struct dwarf2_locexpr_baton *dlbaton;
12054 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
12055 dlbaton->data = DW_BLOCK (attr)->data;
12056 dlbaton->size = DW_BLOCK (attr)->size;
12057 dlbaton->per_cu = cu->per_cu;
12059 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
12061 else if (attr_form_is_ref (attr))
12063 struct dwarf2_cu *target_cu = cu;
12064 struct die_info *target_die;
12066 target_die = follow_die_ref (die, attr, &target_cu);
12067 gdb_assert (target_cu->objfile == objfile);
12068 if (die_is_declaration (target_die, target_cu))
12070 const char *target_physname;
12072 /* Prefer the mangled name; otherwise compute the demangled one. */
12073 target_physname = dw2_linkage_name (target_die, target_cu);
12074 if (target_physname == NULL)
12075 target_physname = dwarf2_physname (NULL, target_die, target_cu);
12076 if (target_physname == NULL)
12077 complaint (&symfile_complaints,
12078 _("DW_AT_call_target target DIE has invalid "
12079 "physname, for referencing DIE 0x%x [in module %s]"),
12080 to_underlying (die->sect_off), objfile_name (objfile));
12082 SET_FIELD_PHYSNAME (call_site->target, target_physname);
12088 /* DW_AT_entry_pc should be preferred. */
12089 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
12090 <= PC_BOUNDS_INVALID)
12091 complaint (&symfile_complaints,
12092 _("DW_AT_call_target target DIE has invalid "
12093 "low pc, for referencing DIE 0x%x [in module %s]"),
12094 to_underlying (die->sect_off), objfile_name (objfile));
12097 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12098 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12103 complaint (&symfile_complaints,
12104 _("DW_TAG_call_site DW_AT_call_target is neither "
12105 "block nor reference, for DIE 0x%x [in module %s]"),
12106 to_underlying (die->sect_off), objfile_name (objfile));
12108 call_site->per_cu = cu->per_cu;
12110 for (child_die = die->child;
12111 child_die && child_die->tag;
12112 child_die = sibling_die (child_die))
12114 struct call_site_parameter *parameter;
12115 struct attribute *loc, *origin;
12117 if (child_die->tag != DW_TAG_call_site_parameter
12118 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12120 /* Already printed the complaint above. */
12124 gdb_assert (call_site->parameter_count < nparams);
12125 parameter = &call_site->parameter[call_site->parameter_count];
12127 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12128 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12129 register is contained in DW_AT_call_value. */
12131 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12132 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12133 if (origin == NULL)
12135 /* This was a pre-DWARF-5 GNU extension alias
12136 for DW_AT_call_parameter. */
12137 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12139 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12141 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12143 sect_offset sect_off
12144 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12145 if (!offset_in_cu_p (&cu->header, sect_off))
12147 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12148 binding can be done only inside one CU. Such referenced DIE
12149 therefore cannot be even moved to DW_TAG_partial_unit. */
12150 complaint (&symfile_complaints,
12151 _("DW_AT_call_parameter offset is not in CU for "
12152 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12153 to_underlying (child_die->sect_off),
12154 objfile_name (objfile));
12157 parameter->u.param_cu_off
12158 = (cu_offset) (sect_off - cu->header.sect_off);
12160 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12162 complaint (&symfile_complaints,
12163 _("No DW_FORM_block* DW_AT_location for "
12164 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12165 to_underlying (child_die->sect_off), objfile_name (objfile));
12170 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12171 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12172 if (parameter->u.dwarf_reg != -1)
12173 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12174 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12175 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12176 ¶meter->u.fb_offset))
12177 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12180 complaint (&symfile_complaints,
12181 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12182 "for DW_FORM_block* DW_AT_location is supported for "
12183 "DW_TAG_call_site child DIE 0x%x "
12185 to_underlying (child_die->sect_off),
12186 objfile_name (objfile));
12191 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12193 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12194 if (!attr_form_is_block (attr))
12196 complaint (&symfile_complaints,
12197 _("No DW_FORM_block* DW_AT_call_value for "
12198 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12199 to_underlying (child_die->sect_off),
12200 objfile_name (objfile));
12203 parameter->value = DW_BLOCK (attr)->data;
12204 parameter->value_size = DW_BLOCK (attr)->size;
12206 /* Parameters are not pre-cleared by memset above. */
12207 parameter->data_value = NULL;
12208 parameter->data_value_size = 0;
12209 call_site->parameter_count++;
12211 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12213 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12216 if (!attr_form_is_block (attr))
12217 complaint (&symfile_complaints,
12218 _("No DW_FORM_block* DW_AT_call_data_value for "
12219 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12220 to_underlying (child_die->sect_off),
12221 objfile_name (objfile));
12224 parameter->data_value = DW_BLOCK (attr)->data;
12225 parameter->data_value_size = DW_BLOCK (attr)->size;
12231 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12232 reading .debug_rnglists.
12233 Callback's type should be:
12234 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12235 Return true if the attributes are present and valid, otherwise,
12238 template <typename Callback>
12240 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12241 Callback &&callback)
12243 struct objfile *objfile = cu->objfile;
12244 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12245 struct comp_unit_head *cu_header = &cu->header;
12246 bfd *obfd = objfile->obfd;
12247 unsigned int addr_size = cu_header->addr_size;
12248 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12249 /* Base address selection entry. */
12252 unsigned int dummy;
12253 const gdb_byte *buffer;
12255 CORE_ADDR high = 0;
12256 CORE_ADDR baseaddr;
12257 bool overflow = false;
12259 found_base = cu->base_known;
12260 base = cu->base_address;
12262 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12263 if (offset >= dwarf2_per_objfile->rnglists.size)
12265 complaint (&symfile_complaints,
12266 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12270 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12272 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12276 /* Initialize it due to a false compiler warning. */
12277 CORE_ADDR range_beginning = 0, range_end = 0;
12278 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12279 + dwarf2_per_objfile->rnglists.size);
12280 unsigned int bytes_read;
12282 if (buffer == buf_end)
12287 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12290 case DW_RLE_end_of_list:
12292 case DW_RLE_base_address:
12293 if (buffer + cu->header.addr_size > buf_end)
12298 base = read_address (obfd, buffer, cu, &bytes_read);
12300 buffer += bytes_read;
12302 case DW_RLE_start_length:
12303 if (buffer + cu->header.addr_size > buf_end)
12308 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12309 buffer += bytes_read;
12310 range_end = (range_beginning
12311 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12312 buffer += bytes_read;
12313 if (buffer > buf_end)
12319 case DW_RLE_offset_pair:
12320 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12321 buffer += bytes_read;
12322 if (buffer > buf_end)
12327 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12328 buffer += bytes_read;
12329 if (buffer > buf_end)
12335 case DW_RLE_start_end:
12336 if (buffer + 2 * cu->header.addr_size > buf_end)
12341 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12342 buffer += bytes_read;
12343 range_end = read_address (obfd, buffer, cu, &bytes_read);
12344 buffer += bytes_read;
12347 complaint (&symfile_complaints,
12348 _("Invalid .debug_rnglists data (no base address)"));
12351 if (rlet == DW_RLE_end_of_list || overflow)
12353 if (rlet == DW_RLE_base_address)
12358 /* We have no valid base address for the ranges
12360 complaint (&symfile_complaints,
12361 _("Invalid .debug_rnglists data (no base address)"));
12365 if (range_beginning > range_end)
12367 /* Inverted range entries are invalid. */
12368 complaint (&symfile_complaints,
12369 _("Invalid .debug_rnglists data (inverted range)"));
12373 /* Empty range entries have no effect. */
12374 if (range_beginning == range_end)
12377 range_beginning += base;
12380 /* A not-uncommon case of bad debug info.
12381 Don't pollute the addrmap with bad data. */
12382 if (range_beginning + baseaddr == 0
12383 && !dwarf2_per_objfile->has_section_at_zero)
12385 complaint (&symfile_complaints,
12386 _(".debug_rnglists entry has start address of zero"
12387 " [in module %s]"), objfile_name (objfile));
12391 callback (range_beginning, range_end);
12396 complaint (&symfile_complaints,
12397 _("Offset %d is not terminated "
12398 "for DW_AT_ranges attribute"),
12406 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
12407 Callback's type should be:
12408 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12409 Return 1 if the attributes are present and valid, otherwise, return 0. */
12411 template <typename Callback>
12413 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
12414 Callback &&callback)
12416 struct objfile *objfile = cu->objfile;
12417 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12418 struct comp_unit_head *cu_header = &cu->header;
12419 bfd *obfd = objfile->obfd;
12420 unsigned int addr_size = cu_header->addr_size;
12421 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12422 /* Base address selection entry. */
12425 unsigned int dummy;
12426 const gdb_byte *buffer;
12427 CORE_ADDR baseaddr;
12429 if (cu_header->version >= 5)
12430 return dwarf2_rnglists_process (offset, cu, callback);
12432 found_base = cu->base_known;
12433 base = cu->base_address;
12435 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12436 if (offset >= dwarf2_per_objfile->ranges.size)
12438 complaint (&symfile_complaints,
12439 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12443 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12445 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12449 CORE_ADDR range_beginning, range_end;
12451 range_beginning = read_address (obfd, buffer, cu, &dummy);
12452 buffer += addr_size;
12453 range_end = read_address (obfd, buffer, cu, &dummy);
12454 buffer += addr_size;
12455 offset += 2 * addr_size;
12457 /* An end of list marker is a pair of zero addresses. */
12458 if (range_beginning == 0 && range_end == 0)
12459 /* Found the end of list entry. */
12462 /* Each base address selection entry is a pair of 2 values.
12463 The first is the largest possible address, the second is
12464 the base address. Check for a base address here. */
12465 if ((range_beginning & mask) == mask)
12467 /* If we found the largest possible address, then we already
12468 have the base address in range_end. */
12476 /* We have no valid base address for the ranges
12478 complaint (&symfile_complaints,
12479 _("Invalid .debug_ranges data (no base address)"));
12483 if (range_beginning > range_end)
12485 /* Inverted range entries are invalid. */
12486 complaint (&symfile_complaints,
12487 _("Invalid .debug_ranges data (inverted range)"));
12491 /* Empty range entries have no effect. */
12492 if (range_beginning == range_end)
12495 range_beginning += base;
12498 /* A not-uncommon case of bad debug info.
12499 Don't pollute the addrmap with bad data. */
12500 if (range_beginning + baseaddr == 0
12501 && !dwarf2_per_objfile->has_section_at_zero)
12503 complaint (&symfile_complaints,
12504 _(".debug_ranges entry has start address of zero"
12505 " [in module %s]"), objfile_name (objfile));
12509 callback (range_beginning, range_end);
12515 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
12516 Return 1 if the attributes are present and valid, otherwise, return 0.
12517 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
12520 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
12521 CORE_ADDR *high_return, struct dwarf2_cu *cu,
12522 struct partial_symtab *ranges_pst)
12524 struct objfile *objfile = cu->objfile;
12525 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12526 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
12527 SECT_OFF_TEXT (objfile));
12530 CORE_ADDR high = 0;
12533 retval = dwarf2_ranges_process (offset, cu,
12534 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
12536 if (ranges_pst != NULL)
12541 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12542 range_beginning + baseaddr);
12543 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12544 range_end + baseaddr);
12545 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12549 /* FIXME: This is recording everything as a low-high
12550 segment of consecutive addresses. We should have a
12551 data structure for discontiguous block ranges
12555 low = range_beginning;
12561 if (range_beginning < low)
12562 low = range_beginning;
12563 if (range_end > high)
12571 /* If the first entry is an end-of-list marker, the range
12572 describes an empty scope, i.e. no instructions. */
12578 *high_return = high;
12582 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12583 definition for the return value. *LOWPC and *HIGHPC are set iff
12584 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12586 static enum pc_bounds_kind
12587 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12588 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12589 struct partial_symtab *pst)
12591 struct attribute *attr;
12592 struct attribute *attr_high;
12594 CORE_ADDR high = 0;
12595 enum pc_bounds_kind ret;
12597 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12600 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12603 low = attr_value_as_address (attr);
12604 high = attr_value_as_address (attr_high);
12605 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12609 /* Found high w/o low attribute. */
12610 return PC_BOUNDS_INVALID;
12612 /* Found consecutive range of addresses. */
12613 ret = PC_BOUNDS_HIGH_LOW;
12617 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12620 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12621 We take advantage of the fact that DW_AT_ranges does not appear
12622 in DW_TAG_compile_unit of DWO files. */
12623 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12624 unsigned int ranges_offset = (DW_UNSND (attr)
12625 + (need_ranges_base
12629 /* Value of the DW_AT_ranges attribute is the offset in the
12630 .debug_ranges section. */
12631 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12632 return PC_BOUNDS_INVALID;
12633 /* Found discontinuous range of addresses. */
12634 ret = PC_BOUNDS_RANGES;
12637 return PC_BOUNDS_NOT_PRESENT;
12640 /* read_partial_die has also the strict LOW < HIGH requirement. */
12642 return PC_BOUNDS_INVALID;
12644 /* When using the GNU linker, .gnu.linkonce. sections are used to
12645 eliminate duplicate copies of functions and vtables and such.
12646 The linker will arbitrarily choose one and discard the others.
12647 The AT_*_pc values for such functions refer to local labels in
12648 these sections. If the section from that file was discarded, the
12649 labels are not in the output, so the relocs get a value of 0.
12650 If this is a discarded function, mark the pc bounds as invalid,
12651 so that GDB will ignore it. */
12652 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12653 return PC_BOUNDS_INVALID;
12661 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12662 its low and high PC addresses. Do nothing if these addresses could not
12663 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12664 and HIGHPC to the high address if greater than HIGHPC. */
12667 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12668 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12669 struct dwarf2_cu *cu)
12671 CORE_ADDR low, high;
12672 struct die_info *child = die->child;
12674 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12676 *lowpc = std::min (*lowpc, low);
12677 *highpc = std::max (*highpc, high);
12680 /* If the language does not allow nested subprograms (either inside
12681 subprograms or lexical blocks), we're done. */
12682 if (cu->language != language_ada)
12685 /* Check all the children of the given DIE. If it contains nested
12686 subprograms, then check their pc bounds. Likewise, we need to
12687 check lexical blocks as well, as they may also contain subprogram
12689 while (child && child->tag)
12691 if (child->tag == DW_TAG_subprogram
12692 || child->tag == DW_TAG_lexical_block)
12693 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12694 child = sibling_die (child);
12698 /* Get the low and high pc's represented by the scope DIE, and store
12699 them in *LOWPC and *HIGHPC. If the correct values can't be
12700 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12703 get_scope_pc_bounds (struct die_info *die,
12704 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12705 struct dwarf2_cu *cu)
12707 CORE_ADDR best_low = (CORE_ADDR) -1;
12708 CORE_ADDR best_high = (CORE_ADDR) 0;
12709 CORE_ADDR current_low, current_high;
12711 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12712 >= PC_BOUNDS_RANGES)
12714 best_low = current_low;
12715 best_high = current_high;
12719 struct die_info *child = die->child;
12721 while (child && child->tag)
12723 switch (child->tag) {
12724 case DW_TAG_subprogram:
12725 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12727 case DW_TAG_namespace:
12728 case DW_TAG_module:
12729 /* FIXME: carlton/2004-01-16: Should we do this for
12730 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12731 that current GCC's always emit the DIEs corresponding
12732 to definitions of methods of classes as children of a
12733 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12734 the DIEs giving the declarations, which could be
12735 anywhere). But I don't see any reason why the
12736 standards says that they have to be there. */
12737 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12739 if (current_low != ((CORE_ADDR) -1))
12741 best_low = std::min (best_low, current_low);
12742 best_high = std::max (best_high, current_high);
12750 child = sibling_die (child);
12755 *highpc = best_high;
12758 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12762 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12763 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12765 struct objfile *objfile = cu->objfile;
12766 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12767 struct attribute *attr;
12768 struct attribute *attr_high;
12770 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12773 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12776 CORE_ADDR low = attr_value_as_address (attr);
12777 CORE_ADDR high = attr_value_as_address (attr_high);
12779 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12782 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12783 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12784 record_block_range (block, low, high - 1);
12788 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12791 bfd *obfd = objfile->obfd;
12792 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12793 We take advantage of the fact that DW_AT_ranges does not appear
12794 in DW_TAG_compile_unit of DWO files. */
12795 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12797 /* The value of the DW_AT_ranges attribute is the offset of the
12798 address range list in the .debug_ranges section. */
12799 unsigned long offset = (DW_UNSND (attr)
12800 + (need_ranges_base ? cu->ranges_base : 0));
12801 const gdb_byte *buffer;
12803 /* For some target architectures, but not others, the
12804 read_address function sign-extends the addresses it returns.
12805 To recognize base address selection entries, we need a
12807 unsigned int addr_size = cu->header.addr_size;
12808 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12810 /* The base address, to which the next pair is relative. Note
12811 that this 'base' is a DWARF concept: most entries in a range
12812 list are relative, to reduce the number of relocs against the
12813 debugging information. This is separate from this function's
12814 'baseaddr' argument, which GDB uses to relocate debugging
12815 information from a shared library based on the address at
12816 which the library was loaded. */
12817 CORE_ADDR base = cu->base_address;
12818 int base_known = cu->base_known;
12820 dwarf2_ranges_process (offset, cu,
12821 [&] (CORE_ADDR start, CORE_ADDR end)
12825 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12826 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12827 record_block_range (block, start, end - 1);
12832 /* Check whether the producer field indicates either of GCC < 4.6, or the
12833 Intel C/C++ compiler, and cache the result in CU. */
12836 check_producer (struct dwarf2_cu *cu)
12840 if (cu->producer == NULL)
12842 /* For unknown compilers expect their behavior is DWARF version
12845 GCC started to support .debug_types sections by -gdwarf-4 since
12846 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12847 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12848 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12849 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12851 else if (producer_is_gcc (cu->producer, &major, &minor))
12853 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12854 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12856 else if (startswith (cu->producer, "Intel(R) C"))
12857 cu->producer_is_icc = 1;
12860 /* For other non-GCC compilers, expect their behavior is DWARF version
12864 cu->checked_producer = 1;
12867 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12868 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12869 during 4.6.0 experimental. */
12872 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12874 if (!cu->checked_producer)
12875 check_producer (cu);
12877 return cu->producer_is_gxx_lt_4_6;
12880 /* Return the default accessibility type if it is not overriden by
12881 DW_AT_accessibility. */
12883 static enum dwarf_access_attribute
12884 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12886 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12888 /* The default DWARF 2 accessibility for members is public, the default
12889 accessibility for inheritance is private. */
12891 if (die->tag != DW_TAG_inheritance)
12892 return DW_ACCESS_public;
12894 return DW_ACCESS_private;
12898 /* DWARF 3+ defines the default accessibility a different way. The same
12899 rules apply now for DW_TAG_inheritance as for the members and it only
12900 depends on the container kind. */
12902 if (die->parent->tag == DW_TAG_class_type)
12903 return DW_ACCESS_private;
12905 return DW_ACCESS_public;
12909 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12910 offset. If the attribute was not found return 0, otherwise return
12911 1. If it was found but could not properly be handled, set *OFFSET
12915 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12918 struct attribute *attr;
12920 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12925 /* Note that we do not check for a section offset first here.
12926 This is because DW_AT_data_member_location is new in DWARF 4,
12927 so if we see it, we can assume that a constant form is really
12928 a constant and not a section offset. */
12929 if (attr_form_is_constant (attr))
12930 *offset = dwarf2_get_attr_constant_value (attr, 0);
12931 else if (attr_form_is_section_offset (attr))
12932 dwarf2_complex_location_expr_complaint ();
12933 else if (attr_form_is_block (attr))
12934 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12936 dwarf2_complex_location_expr_complaint ();
12944 /* Add an aggregate field to the field list. */
12947 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12948 struct dwarf2_cu *cu)
12950 struct objfile *objfile = cu->objfile;
12951 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12952 struct nextfield *new_field;
12953 struct attribute *attr;
12955 const char *fieldname = "";
12957 /* Allocate a new field list entry and link it in. */
12958 new_field = XNEW (struct nextfield);
12959 make_cleanup (xfree, new_field);
12960 memset (new_field, 0, sizeof (struct nextfield));
12962 if (die->tag == DW_TAG_inheritance)
12964 new_field->next = fip->baseclasses;
12965 fip->baseclasses = new_field;
12969 new_field->next = fip->fields;
12970 fip->fields = new_field;
12974 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12976 new_field->accessibility = DW_UNSND (attr);
12978 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12979 if (new_field->accessibility != DW_ACCESS_public)
12980 fip->non_public_fields = 1;
12982 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12984 new_field->virtuality = DW_UNSND (attr);
12986 new_field->virtuality = DW_VIRTUALITY_none;
12988 fp = &new_field->field;
12990 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12994 /* Data member other than a C++ static data member. */
12996 /* Get type of field. */
12997 fp->type = die_type (die, cu);
12999 SET_FIELD_BITPOS (*fp, 0);
13001 /* Get bit size of field (zero if none). */
13002 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
13005 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
13009 FIELD_BITSIZE (*fp) = 0;
13012 /* Get bit offset of field. */
13013 if (handle_data_member_location (die, cu, &offset))
13014 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13015 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
13018 if (gdbarch_bits_big_endian (gdbarch))
13020 /* For big endian bits, the DW_AT_bit_offset gives the
13021 additional bit offset from the MSB of the containing
13022 anonymous object to the MSB of the field. We don't
13023 have to do anything special since we don't need to
13024 know the size of the anonymous object. */
13025 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
13029 /* For little endian bits, compute the bit offset to the
13030 MSB of the anonymous object, subtract off the number of
13031 bits from the MSB of the field to the MSB of the
13032 object, and then subtract off the number of bits of
13033 the field itself. The result is the bit offset of
13034 the LSB of the field. */
13035 int anonymous_size;
13036 int bit_offset = DW_UNSND (attr);
13038 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13041 /* The size of the anonymous object containing
13042 the bit field is explicit, so use the
13043 indicated size (in bytes). */
13044 anonymous_size = DW_UNSND (attr);
13048 /* The size of the anonymous object containing
13049 the bit field must be inferred from the type
13050 attribute of the data member containing the
13052 anonymous_size = TYPE_LENGTH (fp->type);
13054 SET_FIELD_BITPOS (*fp,
13055 (FIELD_BITPOS (*fp)
13056 + anonymous_size * bits_per_byte
13057 - bit_offset - FIELD_BITSIZE (*fp)));
13060 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
13062 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
13063 + dwarf2_get_attr_constant_value (attr, 0)));
13065 /* Get name of field. */
13066 fieldname = dwarf2_name (die, cu);
13067 if (fieldname == NULL)
13070 /* The name is already allocated along with this objfile, so we don't
13071 need to duplicate it for the type. */
13072 fp->name = fieldname;
13074 /* Change accessibility for artificial fields (e.g. virtual table
13075 pointer or virtual base class pointer) to private. */
13076 if (dwarf2_attr (die, DW_AT_artificial, cu))
13078 FIELD_ARTIFICIAL (*fp) = 1;
13079 new_field->accessibility = DW_ACCESS_private;
13080 fip->non_public_fields = 1;
13083 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
13085 /* C++ static member. */
13087 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
13088 is a declaration, but all versions of G++ as of this writing
13089 (so through at least 3.2.1) incorrectly generate
13090 DW_TAG_variable tags. */
13092 const char *physname;
13094 /* Get name of field. */
13095 fieldname = dwarf2_name (die, cu);
13096 if (fieldname == NULL)
13099 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13101 /* Only create a symbol if this is an external value.
13102 new_symbol checks this and puts the value in the global symbol
13103 table, which we want. If it is not external, new_symbol
13104 will try to put the value in cu->list_in_scope which is wrong. */
13105 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13107 /* A static const member, not much different than an enum as far as
13108 we're concerned, except that we can support more types. */
13109 new_symbol (die, NULL, cu);
13112 /* Get physical name. */
13113 physname = dwarf2_physname (fieldname, die, cu);
13115 /* The name is already allocated along with this objfile, so we don't
13116 need to duplicate it for the type. */
13117 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13118 FIELD_TYPE (*fp) = die_type (die, cu);
13119 FIELD_NAME (*fp) = fieldname;
13121 else if (die->tag == DW_TAG_inheritance)
13125 /* C++ base class field. */
13126 if (handle_data_member_location (die, cu, &offset))
13127 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13128 FIELD_BITSIZE (*fp) = 0;
13129 FIELD_TYPE (*fp) = die_type (die, cu);
13130 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
13131 fip->nbaseclasses++;
13135 /* Add a typedef defined in the scope of the FIP's class. */
13138 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
13139 struct dwarf2_cu *cu)
13141 struct typedef_field_list *new_field;
13142 struct typedef_field *fp;
13144 /* Allocate a new field list entry and link it in. */
13145 new_field = XCNEW (struct typedef_field_list);
13146 make_cleanup (xfree, new_field);
13148 gdb_assert (die->tag == DW_TAG_typedef);
13150 fp = &new_field->field;
13152 /* Get name of field. */
13153 fp->name = dwarf2_name (die, cu);
13154 if (fp->name == NULL)
13157 fp->type = read_type_die (die, cu);
13159 new_field->next = fip->typedef_field_list;
13160 fip->typedef_field_list = new_field;
13161 fip->typedef_field_list_count++;
13164 /* Create the vector of fields, and attach it to the type. */
13167 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
13168 struct dwarf2_cu *cu)
13170 int nfields = fip->nfields;
13172 /* Record the field count, allocate space for the array of fields,
13173 and create blank accessibility bitfields if necessary. */
13174 TYPE_NFIELDS (type) = nfields;
13175 TYPE_FIELDS (type) = (struct field *)
13176 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13177 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13179 if (fip->non_public_fields && cu->language != language_ada)
13181 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13183 TYPE_FIELD_PRIVATE_BITS (type) =
13184 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13185 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13187 TYPE_FIELD_PROTECTED_BITS (type) =
13188 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13189 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13191 TYPE_FIELD_IGNORE_BITS (type) =
13192 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13193 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13196 /* If the type has baseclasses, allocate and clear a bit vector for
13197 TYPE_FIELD_VIRTUAL_BITS. */
13198 if (fip->nbaseclasses && cu->language != language_ada)
13200 int num_bytes = B_BYTES (fip->nbaseclasses);
13201 unsigned char *pointer;
13203 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13204 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13205 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13206 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13207 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13210 /* Copy the saved-up fields into the field vector. Start from the head of
13211 the list, adding to the tail of the field array, so that they end up in
13212 the same order in the array in which they were added to the list. */
13213 while (nfields-- > 0)
13215 struct nextfield *fieldp;
13219 fieldp = fip->fields;
13220 fip->fields = fieldp->next;
13224 fieldp = fip->baseclasses;
13225 fip->baseclasses = fieldp->next;
13228 TYPE_FIELD (type, nfields) = fieldp->field;
13229 switch (fieldp->accessibility)
13231 case DW_ACCESS_private:
13232 if (cu->language != language_ada)
13233 SET_TYPE_FIELD_PRIVATE (type, nfields);
13236 case DW_ACCESS_protected:
13237 if (cu->language != language_ada)
13238 SET_TYPE_FIELD_PROTECTED (type, nfields);
13241 case DW_ACCESS_public:
13245 /* Unknown accessibility. Complain and treat it as public. */
13247 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13248 fieldp->accessibility);
13252 if (nfields < fip->nbaseclasses)
13254 switch (fieldp->virtuality)
13256 case DW_VIRTUALITY_virtual:
13257 case DW_VIRTUALITY_pure_virtual:
13258 if (cu->language == language_ada)
13259 error (_("unexpected virtuality in component of Ada type"));
13260 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13267 /* Return true if this member function is a constructor, false
13271 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13273 const char *fieldname;
13274 const char *type_name;
13277 if (die->parent == NULL)
13280 if (die->parent->tag != DW_TAG_structure_type
13281 && die->parent->tag != DW_TAG_union_type
13282 && die->parent->tag != DW_TAG_class_type)
13285 fieldname = dwarf2_name (die, cu);
13286 type_name = dwarf2_name (die->parent, cu);
13287 if (fieldname == NULL || type_name == NULL)
13290 len = strlen (fieldname);
13291 return (strncmp (fieldname, type_name, len) == 0
13292 && (type_name[len] == '\0' || type_name[len] == '<'));
13295 /* Add a member function to the proper fieldlist. */
13298 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13299 struct type *type, struct dwarf2_cu *cu)
13301 struct objfile *objfile = cu->objfile;
13302 struct attribute *attr;
13303 struct fnfieldlist *flp;
13305 struct fn_field *fnp;
13306 const char *fieldname;
13307 struct nextfnfield *new_fnfield;
13308 struct type *this_type;
13309 enum dwarf_access_attribute accessibility;
13311 if (cu->language == language_ada)
13312 error (_("unexpected member function in Ada type"));
13314 /* Get name of member function. */
13315 fieldname = dwarf2_name (die, cu);
13316 if (fieldname == NULL)
13319 /* Look up member function name in fieldlist. */
13320 for (i = 0; i < fip->nfnfields; i++)
13322 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13326 /* Create new list element if necessary. */
13327 if (i < fip->nfnfields)
13328 flp = &fip->fnfieldlists[i];
13331 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13333 fip->fnfieldlists = (struct fnfieldlist *)
13334 xrealloc (fip->fnfieldlists,
13335 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13336 * sizeof (struct fnfieldlist));
13337 if (fip->nfnfields == 0)
13338 make_cleanup (free_current_contents, &fip->fnfieldlists);
13340 flp = &fip->fnfieldlists[fip->nfnfields];
13341 flp->name = fieldname;
13344 i = fip->nfnfields++;
13347 /* Create a new member function field and chain it to the field list
13349 new_fnfield = XNEW (struct nextfnfield);
13350 make_cleanup (xfree, new_fnfield);
13351 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13352 new_fnfield->next = flp->head;
13353 flp->head = new_fnfield;
13356 /* Fill in the member function field info. */
13357 fnp = &new_fnfield->fnfield;
13359 /* Delay processing of the physname until later. */
13360 if (cu->language == language_cplus)
13362 add_to_method_list (type, i, flp->length - 1, fieldname,
13367 const char *physname = dwarf2_physname (fieldname, die, cu);
13368 fnp->physname = physname ? physname : "";
13371 fnp->type = alloc_type (objfile);
13372 this_type = read_type_die (die, cu);
13373 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13375 int nparams = TYPE_NFIELDS (this_type);
13377 /* TYPE is the domain of this method, and THIS_TYPE is the type
13378 of the method itself (TYPE_CODE_METHOD). */
13379 smash_to_method_type (fnp->type, type,
13380 TYPE_TARGET_TYPE (this_type),
13381 TYPE_FIELDS (this_type),
13382 TYPE_NFIELDS (this_type),
13383 TYPE_VARARGS (this_type));
13385 /* Handle static member functions.
13386 Dwarf2 has no clean way to discern C++ static and non-static
13387 member functions. G++ helps GDB by marking the first
13388 parameter for non-static member functions (which is the this
13389 pointer) as artificial. We obtain this information from
13390 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
13391 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
13392 fnp->voffset = VOFFSET_STATIC;
13395 complaint (&symfile_complaints, _("member function type missing for '%s'"),
13396 dwarf2_full_name (fieldname, die, cu));
13398 /* Get fcontext from DW_AT_containing_type if present. */
13399 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13400 fnp->fcontext = die_containing_type (die, cu);
13402 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
13403 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
13405 /* Get accessibility. */
13406 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13408 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13410 accessibility = dwarf2_default_access_attribute (die, cu);
13411 switch (accessibility)
13413 case DW_ACCESS_private:
13414 fnp->is_private = 1;
13416 case DW_ACCESS_protected:
13417 fnp->is_protected = 1;
13421 /* Check for artificial methods. */
13422 attr = dwarf2_attr (die, DW_AT_artificial, cu);
13423 if (attr && DW_UNSND (attr) != 0)
13424 fnp->is_artificial = 1;
13426 fnp->is_constructor = dwarf2_is_constructor (die, cu);
13428 /* Get index in virtual function table if it is a virtual member
13429 function. For older versions of GCC, this is an offset in the
13430 appropriate virtual table, as specified by DW_AT_containing_type.
13431 For everyone else, it is an expression to be evaluated relative
13432 to the object address. */
13434 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
13437 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
13439 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
13441 /* Old-style GCC. */
13442 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
13444 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
13445 || (DW_BLOCK (attr)->size > 1
13446 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
13447 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
13449 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
13450 if ((fnp->voffset % cu->header.addr_size) != 0)
13451 dwarf2_complex_location_expr_complaint ();
13453 fnp->voffset /= cu->header.addr_size;
13457 dwarf2_complex_location_expr_complaint ();
13459 if (!fnp->fcontext)
13461 /* If there is no `this' field and no DW_AT_containing_type,
13462 we cannot actually find a base class context for the
13464 if (TYPE_NFIELDS (this_type) == 0
13465 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
13467 complaint (&symfile_complaints,
13468 _("cannot determine context for virtual member "
13469 "function \"%s\" (offset %d)"),
13470 fieldname, to_underlying (die->sect_off));
13475 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13479 else if (attr_form_is_section_offset (attr))
13481 dwarf2_complex_location_expr_complaint ();
13485 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13491 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13492 if (attr && DW_UNSND (attr))
13494 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13495 complaint (&symfile_complaints,
13496 _("Member function \"%s\" (offset %d) is virtual "
13497 "but the vtable offset is not specified"),
13498 fieldname, to_underlying (die->sect_off));
13499 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13500 TYPE_CPLUS_DYNAMIC (type) = 1;
13505 /* Create the vector of member function fields, and attach it to the type. */
13508 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13509 struct dwarf2_cu *cu)
13511 struct fnfieldlist *flp;
13514 if (cu->language == language_ada)
13515 error (_("unexpected member functions in Ada type"));
13517 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13518 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13519 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13521 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13523 struct nextfnfield *nfp = flp->head;
13524 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13527 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13528 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13529 fn_flp->fn_fields = (struct fn_field *)
13530 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13531 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13532 fn_flp->fn_fields[k] = nfp->fnfield;
13535 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13538 /* Returns non-zero if NAME is the name of a vtable member in CU's
13539 language, zero otherwise. */
13541 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13543 static const char vptr[] = "_vptr";
13544 static const char vtable[] = "vtable";
13546 /* Look for the C++ form of the vtable. */
13547 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13553 /* GCC outputs unnamed structures that are really pointers to member
13554 functions, with the ABI-specified layout. If TYPE describes
13555 such a structure, smash it into a member function type.
13557 GCC shouldn't do this; it should just output pointer to member DIEs.
13558 This is GCC PR debug/28767. */
13561 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13563 struct type *pfn_type, *self_type, *new_type;
13565 /* Check for a structure with no name and two children. */
13566 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13569 /* Check for __pfn and __delta members. */
13570 if (TYPE_FIELD_NAME (type, 0) == NULL
13571 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13572 || TYPE_FIELD_NAME (type, 1) == NULL
13573 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13576 /* Find the type of the method. */
13577 pfn_type = TYPE_FIELD_TYPE (type, 0);
13578 if (pfn_type == NULL
13579 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13580 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13583 /* Look for the "this" argument. */
13584 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13585 if (TYPE_NFIELDS (pfn_type) == 0
13586 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13587 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13590 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13591 new_type = alloc_type (objfile);
13592 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13593 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13594 TYPE_VARARGS (pfn_type));
13595 smash_to_methodptr_type (type, new_type);
13598 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13602 producer_is_icc (struct dwarf2_cu *cu)
13604 if (!cu->checked_producer)
13605 check_producer (cu);
13607 return cu->producer_is_icc;
13610 /* Called when we find the DIE that starts a structure or union scope
13611 (definition) to create a type for the structure or union. Fill in
13612 the type's name and general properties; the members will not be
13613 processed until process_structure_scope. A symbol table entry for
13614 the type will also not be done until process_structure_scope (assuming
13615 the type has a name).
13617 NOTE: we need to call these functions regardless of whether or not the
13618 DIE has a DW_AT_name attribute, since it might be an anonymous
13619 structure or union. This gets the type entered into our set of
13620 user defined types. */
13622 static struct type *
13623 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13625 struct objfile *objfile = cu->objfile;
13627 struct attribute *attr;
13630 /* If the definition of this type lives in .debug_types, read that type.
13631 Don't follow DW_AT_specification though, that will take us back up
13632 the chain and we want to go down. */
13633 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13636 type = get_DW_AT_signature_type (die, attr, cu);
13638 /* The type's CU may not be the same as CU.
13639 Ensure TYPE is recorded with CU in die_type_hash. */
13640 return set_die_type (die, type, cu);
13643 type = alloc_type (objfile);
13644 INIT_CPLUS_SPECIFIC (type);
13646 name = dwarf2_name (die, cu);
13649 if (cu->language == language_cplus
13650 || cu->language == language_d
13651 || cu->language == language_rust)
13653 const char *full_name = dwarf2_full_name (name, die, cu);
13655 /* dwarf2_full_name might have already finished building the DIE's
13656 type. If so, there is no need to continue. */
13657 if (get_die_type (die, cu) != NULL)
13658 return get_die_type (die, cu);
13660 TYPE_TAG_NAME (type) = full_name;
13661 if (die->tag == DW_TAG_structure_type
13662 || die->tag == DW_TAG_class_type)
13663 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13667 /* The name is already allocated along with this objfile, so
13668 we don't need to duplicate it for the type. */
13669 TYPE_TAG_NAME (type) = name;
13670 if (die->tag == DW_TAG_class_type)
13671 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13675 if (die->tag == DW_TAG_structure_type)
13677 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13679 else if (die->tag == DW_TAG_union_type)
13681 TYPE_CODE (type) = TYPE_CODE_UNION;
13685 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13688 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13689 TYPE_DECLARED_CLASS (type) = 1;
13691 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13694 if (attr_form_is_constant (attr))
13695 TYPE_LENGTH (type) = DW_UNSND (attr);
13698 /* For the moment, dynamic type sizes are not supported
13699 by GDB's struct type. The actual size is determined
13700 on-demand when resolving the type of a given object,
13701 so set the type's length to zero for now. Otherwise,
13702 we record an expression as the length, and that expression
13703 could lead to a very large value, which could eventually
13704 lead to us trying to allocate that much memory when creating
13705 a value of that type. */
13706 TYPE_LENGTH (type) = 0;
13711 TYPE_LENGTH (type) = 0;
13714 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13716 /* ICC does not output the required DW_AT_declaration
13717 on incomplete types, but gives them a size of zero. */
13718 TYPE_STUB (type) = 1;
13721 TYPE_STUB_SUPPORTED (type) = 1;
13723 if (die_is_declaration (die, cu))
13724 TYPE_STUB (type) = 1;
13725 else if (attr == NULL && die->child == NULL
13726 && producer_is_realview (cu->producer))
13727 /* RealView does not output the required DW_AT_declaration
13728 on incomplete types. */
13729 TYPE_STUB (type) = 1;
13731 /* We need to add the type field to the die immediately so we don't
13732 infinitely recurse when dealing with pointers to the structure
13733 type within the structure itself. */
13734 set_die_type (die, type, cu);
13736 /* set_die_type should be already done. */
13737 set_descriptive_type (type, die, cu);
13742 /* Finish creating a structure or union type, including filling in
13743 its members and creating a symbol for it. */
13746 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13748 struct objfile *objfile = cu->objfile;
13749 struct die_info *child_die;
13752 type = get_die_type (die, cu);
13754 type = read_structure_type (die, cu);
13756 if (die->child != NULL && ! die_is_declaration (die, cu))
13758 struct field_info fi;
13759 VEC (symbolp) *template_args = NULL;
13760 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13762 memset (&fi, 0, sizeof (struct field_info));
13764 child_die = die->child;
13766 while (child_die && child_die->tag)
13768 if (child_die->tag == DW_TAG_member
13769 || child_die->tag == DW_TAG_variable)
13771 /* NOTE: carlton/2002-11-05: A C++ static data member
13772 should be a DW_TAG_member that is a declaration, but
13773 all versions of G++ as of this writing (so through at
13774 least 3.2.1) incorrectly generate DW_TAG_variable
13775 tags for them instead. */
13776 dwarf2_add_field (&fi, child_die, cu);
13778 else if (child_die->tag == DW_TAG_subprogram)
13780 /* Rust doesn't have member functions in the C++ sense.
13781 However, it does emit ordinary functions as children
13782 of a struct DIE. */
13783 if (cu->language == language_rust)
13784 read_func_scope (child_die, cu);
13787 /* C++ member function. */
13788 dwarf2_add_member_fn (&fi, child_die, type, cu);
13791 else if (child_die->tag == DW_TAG_inheritance)
13793 /* C++ base class field. */
13794 dwarf2_add_field (&fi, child_die, cu);
13796 else if (child_die->tag == DW_TAG_typedef)
13797 dwarf2_add_typedef (&fi, child_die, cu);
13798 else if (child_die->tag == DW_TAG_template_type_param
13799 || child_die->tag == DW_TAG_template_value_param)
13801 struct symbol *arg = new_symbol (child_die, NULL, cu);
13804 VEC_safe_push (symbolp, template_args, arg);
13807 child_die = sibling_die (child_die);
13810 /* Attach template arguments to type. */
13811 if (! VEC_empty (symbolp, template_args))
13813 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13814 TYPE_N_TEMPLATE_ARGUMENTS (type)
13815 = VEC_length (symbolp, template_args);
13816 TYPE_TEMPLATE_ARGUMENTS (type)
13817 = XOBNEWVEC (&objfile->objfile_obstack,
13819 TYPE_N_TEMPLATE_ARGUMENTS (type));
13820 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13821 VEC_address (symbolp, template_args),
13822 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13823 * sizeof (struct symbol *)));
13824 VEC_free (symbolp, template_args);
13827 /* Attach fields and member functions to the type. */
13829 dwarf2_attach_fields_to_type (&fi, type, cu);
13832 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13834 /* Get the type which refers to the base class (possibly this
13835 class itself) which contains the vtable pointer for the current
13836 class from the DW_AT_containing_type attribute. This use of
13837 DW_AT_containing_type is a GNU extension. */
13839 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13841 struct type *t = die_containing_type (die, cu);
13843 set_type_vptr_basetype (type, t);
13848 /* Our own class provides vtbl ptr. */
13849 for (i = TYPE_NFIELDS (t) - 1;
13850 i >= TYPE_N_BASECLASSES (t);
13853 const char *fieldname = TYPE_FIELD_NAME (t, i);
13855 if (is_vtable_name (fieldname, cu))
13857 set_type_vptr_fieldno (type, i);
13862 /* Complain if virtual function table field not found. */
13863 if (i < TYPE_N_BASECLASSES (t))
13864 complaint (&symfile_complaints,
13865 _("virtual function table pointer "
13866 "not found when defining class '%s'"),
13867 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13872 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13875 else if (cu->producer
13876 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13878 /* The IBM XLC compiler does not provide direct indication
13879 of the containing type, but the vtable pointer is
13880 always named __vfp. */
13884 for (i = TYPE_NFIELDS (type) - 1;
13885 i >= TYPE_N_BASECLASSES (type);
13888 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13890 set_type_vptr_fieldno (type, i);
13891 set_type_vptr_basetype (type, type);
13898 /* Copy fi.typedef_field_list linked list elements content into the
13899 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13900 if (fi.typedef_field_list)
13902 int i = fi.typedef_field_list_count;
13904 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13905 TYPE_TYPEDEF_FIELD_ARRAY (type)
13906 = ((struct typedef_field *)
13907 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13908 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13910 /* Reverse the list order to keep the debug info elements order. */
13913 struct typedef_field *dest, *src;
13915 dest = &TYPE_TYPEDEF_FIELD (type, i);
13916 src = &fi.typedef_field_list->field;
13917 fi.typedef_field_list = fi.typedef_field_list->next;
13922 do_cleanups (back_to);
13925 quirk_gcc_member_function_pointer (type, objfile);
13927 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13928 snapshots) has been known to create a die giving a declaration
13929 for a class that has, as a child, a die giving a definition for a
13930 nested class. So we have to process our children even if the
13931 current die is a declaration. Normally, of course, a declaration
13932 won't have any children at all. */
13934 child_die = die->child;
13936 while (child_die != NULL && child_die->tag)
13938 if (child_die->tag == DW_TAG_member
13939 || child_die->tag == DW_TAG_variable
13940 || child_die->tag == DW_TAG_inheritance
13941 || child_die->tag == DW_TAG_template_value_param
13942 || child_die->tag == DW_TAG_template_type_param)
13947 process_die (child_die, cu);
13949 child_die = sibling_die (child_die);
13952 /* Do not consider external references. According to the DWARF standard,
13953 these DIEs are identified by the fact that they have no byte_size
13954 attribute, and a declaration attribute. */
13955 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13956 || !die_is_declaration (die, cu))
13957 new_symbol (die, type, cu);
13960 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13961 update TYPE using some information only available in DIE's children. */
13964 update_enumeration_type_from_children (struct die_info *die,
13966 struct dwarf2_cu *cu)
13968 struct die_info *child_die;
13969 int unsigned_enum = 1;
13973 auto_obstack obstack;
13975 for (child_die = die->child;
13976 child_die != NULL && child_die->tag;
13977 child_die = sibling_die (child_die))
13979 struct attribute *attr;
13981 const gdb_byte *bytes;
13982 struct dwarf2_locexpr_baton *baton;
13985 if (child_die->tag != DW_TAG_enumerator)
13988 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13992 name = dwarf2_name (child_die, cu);
13994 name = "<anonymous enumerator>";
13996 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13997 &value, &bytes, &baton);
14003 else if ((mask & value) != 0)
14008 /* If we already know that the enum type is neither unsigned, nor
14009 a flag type, no need to look at the rest of the enumerates. */
14010 if (!unsigned_enum && !flag_enum)
14015 TYPE_UNSIGNED (type) = 1;
14017 TYPE_FLAG_ENUM (type) = 1;
14020 /* Given a DW_AT_enumeration_type die, set its type. We do not
14021 complete the type's fields yet, or create any symbols. */
14023 static struct type *
14024 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
14026 struct objfile *objfile = cu->objfile;
14028 struct attribute *attr;
14031 /* If the definition of this type lives in .debug_types, read that type.
14032 Don't follow DW_AT_specification though, that will take us back up
14033 the chain and we want to go down. */
14034 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14037 type = get_DW_AT_signature_type (die, attr, cu);
14039 /* The type's CU may not be the same as CU.
14040 Ensure TYPE is recorded with CU in die_type_hash. */
14041 return set_die_type (die, type, cu);
14044 type = alloc_type (objfile);
14046 TYPE_CODE (type) = TYPE_CODE_ENUM;
14047 name = dwarf2_full_name (NULL, die, cu);
14049 TYPE_TAG_NAME (type) = name;
14051 attr = dwarf2_attr (die, DW_AT_type, cu);
14054 struct type *underlying_type = die_type (die, cu);
14056 TYPE_TARGET_TYPE (type) = underlying_type;
14059 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14062 TYPE_LENGTH (type) = DW_UNSND (attr);
14066 TYPE_LENGTH (type) = 0;
14069 /* The enumeration DIE can be incomplete. In Ada, any type can be
14070 declared as private in the package spec, and then defined only
14071 inside the package body. Such types are known as Taft Amendment
14072 Types. When another package uses such a type, an incomplete DIE
14073 may be generated by the compiler. */
14074 if (die_is_declaration (die, cu))
14075 TYPE_STUB (type) = 1;
14077 /* Finish the creation of this type by using the enum's children.
14078 We must call this even when the underlying type has been provided
14079 so that we can determine if we're looking at a "flag" enum. */
14080 update_enumeration_type_from_children (die, type, cu);
14082 /* If this type has an underlying type that is not a stub, then we
14083 may use its attributes. We always use the "unsigned" attribute
14084 in this situation, because ordinarily we guess whether the type
14085 is unsigned -- but the guess can be wrong and the underlying type
14086 can tell us the reality. However, we defer to a local size
14087 attribute if one exists, because this lets the compiler override
14088 the underlying type if needed. */
14089 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
14091 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
14092 if (TYPE_LENGTH (type) == 0)
14093 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
14096 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14098 return set_die_type (die, type, cu);
14101 /* Given a pointer to a die which begins an enumeration, process all
14102 the dies that define the members of the enumeration, and create the
14103 symbol for the enumeration type.
14105 NOTE: We reverse the order of the element list. */
14108 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14110 struct type *this_type;
14112 this_type = get_die_type (die, cu);
14113 if (this_type == NULL)
14114 this_type = read_enumeration_type (die, cu);
14116 if (die->child != NULL)
14118 struct die_info *child_die;
14119 struct symbol *sym;
14120 struct field *fields = NULL;
14121 int num_fields = 0;
14124 child_die = die->child;
14125 while (child_die && child_die->tag)
14127 if (child_die->tag != DW_TAG_enumerator)
14129 process_die (child_die, cu);
14133 name = dwarf2_name (child_die, cu);
14136 sym = new_symbol (child_die, this_type, cu);
14138 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
14140 fields = (struct field *)
14142 (num_fields + DW_FIELD_ALLOC_CHUNK)
14143 * sizeof (struct field));
14146 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
14147 FIELD_TYPE (fields[num_fields]) = NULL;
14148 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
14149 FIELD_BITSIZE (fields[num_fields]) = 0;
14155 child_die = sibling_die (child_die);
14160 TYPE_NFIELDS (this_type) = num_fields;
14161 TYPE_FIELDS (this_type) = (struct field *)
14162 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
14163 memcpy (TYPE_FIELDS (this_type), fields,
14164 sizeof (struct field) * num_fields);
14169 /* If we are reading an enum from a .debug_types unit, and the enum
14170 is a declaration, and the enum is not the signatured type in the
14171 unit, then we do not want to add a symbol for it. Adding a
14172 symbol would in some cases obscure the true definition of the
14173 enum, giving users an incomplete type when the definition is
14174 actually available. Note that we do not want to do this for all
14175 enums which are just declarations, because C++0x allows forward
14176 enum declarations. */
14177 if (cu->per_cu->is_debug_types
14178 && die_is_declaration (die, cu))
14180 struct signatured_type *sig_type;
14182 sig_type = (struct signatured_type *) cu->per_cu;
14183 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14184 if (sig_type->type_offset_in_section != die->sect_off)
14188 new_symbol (die, this_type, cu);
14191 /* Extract all information from a DW_TAG_array_type DIE and put it in
14192 the DIE's type field. For now, this only handles one dimensional
14195 static struct type *
14196 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14198 struct objfile *objfile = cu->objfile;
14199 struct die_info *child_die;
14201 struct type *element_type, *range_type, *index_type;
14202 struct type **range_types = NULL;
14203 struct attribute *attr;
14205 struct cleanup *back_to;
14207 unsigned int bit_stride = 0;
14209 element_type = die_type (die, cu);
14211 /* The die_type call above may have already set the type for this DIE. */
14212 type = get_die_type (die, cu);
14216 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14218 bit_stride = DW_UNSND (attr) * 8;
14220 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14222 bit_stride = DW_UNSND (attr);
14224 /* Irix 6.2 native cc creates array types without children for
14225 arrays with unspecified length. */
14226 if (die->child == NULL)
14228 index_type = objfile_type (objfile)->builtin_int;
14229 range_type = create_static_range_type (NULL, index_type, 0, -1);
14230 type = create_array_type_with_stride (NULL, element_type, range_type,
14232 return set_die_type (die, type, cu);
14235 back_to = make_cleanup (null_cleanup, NULL);
14236 child_die = die->child;
14237 while (child_die && child_die->tag)
14239 if (child_die->tag == DW_TAG_subrange_type)
14241 struct type *child_type = read_type_die (child_die, cu);
14243 if (child_type != NULL)
14245 /* The range type was succesfully read. Save it for the
14246 array type creation. */
14247 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
14249 range_types = (struct type **)
14250 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
14251 * sizeof (struct type *));
14253 make_cleanup (free_current_contents, &range_types);
14255 range_types[ndim++] = child_type;
14258 child_die = sibling_die (child_die);
14261 /* Dwarf2 dimensions are output from left to right, create the
14262 necessary array types in backwards order. */
14264 type = element_type;
14266 if (read_array_order (die, cu) == DW_ORD_col_major)
14271 type = create_array_type_with_stride (NULL, type, range_types[i++],
14277 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14281 /* Understand Dwarf2 support for vector types (like they occur on
14282 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14283 array type. This is not part of the Dwarf2/3 standard yet, but a
14284 custom vendor extension. The main difference between a regular
14285 array and the vector variant is that vectors are passed by value
14287 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14289 make_vector_type (type);
14291 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14292 implementation may choose to implement triple vectors using this
14294 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14297 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14298 TYPE_LENGTH (type) = DW_UNSND (attr);
14300 complaint (&symfile_complaints,
14301 _("DW_AT_byte_size for array type smaller "
14302 "than the total size of elements"));
14305 name = dwarf2_name (die, cu);
14307 TYPE_NAME (type) = name;
14309 /* Install the type in the die. */
14310 set_die_type (die, type, cu);
14312 /* set_die_type should be already done. */
14313 set_descriptive_type (type, die, cu);
14315 do_cleanups (back_to);
14320 static enum dwarf_array_dim_ordering
14321 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14323 struct attribute *attr;
14325 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14328 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14330 /* GNU F77 is a special case, as at 08/2004 array type info is the
14331 opposite order to the dwarf2 specification, but data is still
14332 laid out as per normal fortran.
14334 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14335 version checking. */
14337 if (cu->language == language_fortran
14338 && cu->producer && strstr (cu->producer, "GNU F77"))
14340 return DW_ORD_row_major;
14343 switch (cu->language_defn->la_array_ordering)
14345 case array_column_major:
14346 return DW_ORD_col_major;
14347 case array_row_major:
14349 return DW_ORD_row_major;
14353 /* Extract all information from a DW_TAG_set_type DIE and put it in
14354 the DIE's type field. */
14356 static struct type *
14357 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14359 struct type *domain_type, *set_type;
14360 struct attribute *attr;
14362 domain_type = die_type (die, cu);
14364 /* The die_type call above may have already set the type for this DIE. */
14365 set_type = get_die_type (die, cu);
14369 set_type = create_set_type (NULL, domain_type);
14371 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14373 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14375 return set_die_type (die, set_type, cu);
14378 /* A helper for read_common_block that creates a locexpr baton.
14379 SYM is the symbol which we are marking as computed.
14380 COMMON_DIE is the DIE for the common block.
14381 COMMON_LOC is the location expression attribute for the common
14383 MEMBER_LOC is the location expression attribute for the particular
14384 member of the common block that we are processing.
14385 CU is the CU from which the above come. */
14388 mark_common_block_symbol_computed (struct symbol *sym,
14389 struct die_info *common_die,
14390 struct attribute *common_loc,
14391 struct attribute *member_loc,
14392 struct dwarf2_cu *cu)
14394 struct objfile *objfile = dwarf2_per_objfile->objfile;
14395 struct dwarf2_locexpr_baton *baton;
14397 unsigned int cu_off;
14398 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14399 LONGEST offset = 0;
14401 gdb_assert (common_loc && member_loc);
14402 gdb_assert (attr_form_is_block (common_loc));
14403 gdb_assert (attr_form_is_block (member_loc)
14404 || attr_form_is_constant (member_loc));
14406 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14407 baton->per_cu = cu->per_cu;
14408 gdb_assert (baton->per_cu);
14410 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
14412 if (attr_form_is_constant (member_loc))
14414 offset = dwarf2_get_attr_constant_value (member_loc, 0);
14415 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
14418 baton->size += DW_BLOCK (member_loc)->size;
14420 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
14423 *ptr++ = DW_OP_call4;
14424 cu_off = common_die->sect_off - cu->per_cu->sect_off;
14425 store_unsigned_integer (ptr, 4, byte_order, cu_off);
14428 if (attr_form_is_constant (member_loc))
14430 *ptr++ = DW_OP_addr;
14431 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
14432 ptr += cu->header.addr_size;
14436 /* We have to copy the data here, because DW_OP_call4 will only
14437 use a DW_AT_location attribute. */
14438 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
14439 ptr += DW_BLOCK (member_loc)->size;
14442 *ptr++ = DW_OP_plus;
14443 gdb_assert (ptr - baton->data == baton->size);
14445 SYMBOL_LOCATION_BATON (sym) = baton;
14446 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
14449 /* Create appropriate locally-scoped variables for all the
14450 DW_TAG_common_block entries. Also create a struct common_block
14451 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
14452 is used to sepate the common blocks name namespace from regular
14456 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
14458 struct attribute *attr;
14460 attr = dwarf2_attr (die, DW_AT_location, cu);
14463 /* Support the .debug_loc offsets. */
14464 if (attr_form_is_block (attr))
14468 else if (attr_form_is_section_offset (attr))
14470 dwarf2_complex_location_expr_complaint ();
14475 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14476 "common block member");
14481 if (die->child != NULL)
14483 struct objfile *objfile = cu->objfile;
14484 struct die_info *child_die;
14485 size_t n_entries = 0, size;
14486 struct common_block *common_block;
14487 struct symbol *sym;
14489 for (child_die = die->child;
14490 child_die && child_die->tag;
14491 child_die = sibling_die (child_die))
14494 size = (sizeof (struct common_block)
14495 + (n_entries - 1) * sizeof (struct symbol *));
14497 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14499 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14500 common_block->n_entries = 0;
14502 for (child_die = die->child;
14503 child_die && child_die->tag;
14504 child_die = sibling_die (child_die))
14506 /* Create the symbol in the DW_TAG_common_block block in the current
14508 sym = new_symbol (child_die, NULL, cu);
14511 struct attribute *member_loc;
14513 common_block->contents[common_block->n_entries++] = sym;
14515 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14519 /* GDB has handled this for a long time, but it is
14520 not specified by DWARF. It seems to have been
14521 emitted by gfortran at least as recently as:
14522 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14523 complaint (&symfile_complaints,
14524 _("Variable in common block has "
14525 "DW_AT_data_member_location "
14526 "- DIE at 0x%x [in module %s]"),
14527 to_underlying (child_die->sect_off),
14528 objfile_name (cu->objfile));
14530 if (attr_form_is_section_offset (member_loc))
14531 dwarf2_complex_location_expr_complaint ();
14532 else if (attr_form_is_constant (member_loc)
14533 || attr_form_is_block (member_loc))
14536 mark_common_block_symbol_computed (sym, die, attr,
14540 dwarf2_complex_location_expr_complaint ();
14545 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14546 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14550 /* Create a type for a C++ namespace. */
14552 static struct type *
14553 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14555 struct objfile *objfile = cu->objfile;
14556 const char *previous_prefix, *name;
14560 /* For extensions, reuse the type of the original namespace. */
14561 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14563 struct die_info *ext_die;
14564 struct dwarf2_cu *ext_cu = cu;
14566 ext_die = dwarf2_extension (die, &ext_cu);
14567 type = read_type_die (ext_die, ext_cu);
14569 /* EXT_CU may not be the same as CU.
14570 Ensure TYPE is recorded with CU in die_type_hash. */
14571 return set_die_type (die, type, cu);
14574 name = namespace_name (die, &is_anonymous, cu);
14576 /* Now build the name of the current namespace. */
14578 previous_prefix = determine_prefix (die, cu);
14579 if (previous_prefix[0] != '\0')
14580 name = typename_concat (&objfile->objfile_obstack,
14581 previous_prefix, name, 0, cu);
14583 /* Create the type. */
14584 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14585 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14587 return set_die_type (die, type, cu);
14590 /* Read a namespace scope. */
14593 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14595 struct objfile *objfile = cu->objfile;
14598 /* Add a symbol associated to this if we haven't seen the namespace
14599 before. Also, add a using directive if it's an anonymous
14602 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14606 type = read_type_die (die, cu);
14607 new_symbol (die, type, cu);
14609 namespace_name (die, &is_anonymous, cu);
14612 const char *previous_prefix = determine_prefix (die, cu);
14614 std::vector<const char *> excludes;
14615 add_using_directive (using_directives (cu->language),
14616 previous_prefix, TYPE_NAME (type), NULL,
14617 NULL, excludes, 0, &objfile->objfile_obstack);
14621 if (die->child != NULL)
14623 struct die_info *child_die = die->child;
14625 while (child_die && child_die->tag)
14627 process_die (child_die, cu);
14628 child_die = sibling_die (child_die);
14633 /* Read a Fortran module as type. This DIE can be only a declaration used for
14634 imported module. Still we need that type as local Fortran "use ... only"
14635 declaration imports depend on the created type in determine_prefix. */
14637 static struct type *
14638 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14640 struct objfile *objfile = cu->objfile;
14641 const char *module_name;
14644 module_name = dwarf2_name (die, cu);
14646 complaint (&symfile_complaints,
14647 _("DW_TAG_module has no name, offset 0x%x"),
14648 to_underlying (die->sect_off));
14649 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14651 /* determine_prefix uses TYPE_TAG_NAME. */
14652 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14654 return set_die_type (die, type, cu);
14657 /* Read a Fortran module. */
14660 read_module (struct die_info *die, struct dwarf2_cu *cu)
14662 struct die_info *child_die = die->child;
14665 type = read_type_die (die, cu);
14666 new_symbol (die, type, cu);
14668 while (child_die && child_die->tag)
14670 process_die (child_die, cu);
14671 child_die = sibling_die (child_die);
14675 /* Return the name of the namespace represented by DIE. Set
14676 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14679 static const char *
14680 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14682 struct die_info *current_die;
14683 const char *name = NULL;
14685 /* Loop through the extensions until we find a name. */
14687 for (current_die = die;
14688 current_die != NULL;
14689 current_die = dwarf2_extension (die, &cu))
14691 /* We don't use dwarf2_name here so that we can detect the absence
14692 of a name -> anonymous namespace. */
14693 name = dwarf2_string_attr (die, DW_AT_name, cu);
14699 /* Is it an anonymous namespace? */
14701 *is_anonymous = (name == NULL);
14703 name = CP_ANONYMOUS_NAMESPACE_STR;
14708 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14709 the user defined type vector. */
14711 static struct type *
14712 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14714 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14715 struct comp_unit_head *cu_header = &cu->header;
14717 struct attribute *attr_byte_size;
14718 struct attribute *attr_address_class;
14719 int byte_size, addr_class;
14720 struct type *target_type;
14722 target_type = die_type (die, cu);
14724 /* The die_type call above may have already set the type for this DIE. */
14725 type = get_die_type (die, cu);
14729 type = lookup_pointer_type (target_type);
14731 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14732 if (attr_byte_size)
14733 byte_size = DW_UNSND (attr_byte_size);
14735 byte_size = cu_header->addr_size;
14737 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14738 if (attr_address_class)
14739 addr_class = DW_UNSND (attr_address_class);
14741 addr_class = DW_ADDR_none;
14743 /* If the pointer size or address class is different than the
14744 default, create a type variant marked as such and set the
14745 length accordingly. */
14746 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14748 if (gdbarch_address_class_type_flags_p (gdbarch))
14752 type_flags = gdbarch_address_class_type_flags
14753 (gdbarch, byte_size, addr_class);
14754 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14756 type = make_type_with_address_space (type, type_flags);
14758 else if (TYPE_LENGTH (type) != byte_size)
14760 complaint (&symfile_complaints,
14761 _("invalid pointer size %d"), byte_size);
14765 /* Should we also complain about unhandled address classes? */
14769 TYPE_LENGTH (type) = byte_size;
14770 return set_die_type (die, type, cu);
14773 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14774 the user defined type vector. */
14776 static struct type *
14777 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14780 struct type *to_type;
14781 struct type *domain;
14783 to_type = die_type (die, cu);
14784 domain = die_containing_type (die, cu);
14786 /* The calls above may have already set the type for this DIE. */
14787 type = get_die_type (die, cu);
14791 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14792 type = lookup_methodptr_type (to_type);
14793 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14795 struct type *new_type = alloc_type (cu->objfile);
14797 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14798 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14799 TYPE_VARARGS (to_type));
14800 type = lookup_methodptr_type (new_type);
14803 type = lookup_memberptr_type (to_type, domain);
14805 return set_die_type (die, type, cu);
14808 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
14809 the user defined type vector. */
14811 static struct type *
14812 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
14813 enum type_code refcode)
14815 struct comp_unit_head *cu_header = &cu->header;
14816 struct type *type, *target_type;
14817 struct attribute *attr;
14819 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
14821 target_type = die_type (die, cu);
14823 /* The die_type call above may have already set the type for this DIE. */
14824 type = get_die_type (die, cu);
14828 type = lookup_reference_type (target_type, refcode);
14829 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14832 TYPE_LENGTH (type) = DW_UNSND (attr);
14836 TYPE_LENGTH (type) = cu_header->addr_size;
14838 return set_die_type (die, type, cu);
14841 /* Add the given cv-qualifiers to the element type of the array. GCC
14842 outputs DWARF type qualifiers that apply to an array, not the
14843 element type. But GDB relies on the array element type to carry
14844 the cv-qualifiers. This mimics section 6.7.3 of the C99
14847 static struct type *
14848 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14849 struct type *base_type, int cnst, int voltl)
14851 struct type *el_type, *inner_array;
14853 base_type = copy_type (base_type);
14854 inner_array = base_type;
14856 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14858 TYPE_TARGET_TYPE (inner_array) =
14859 copy_type (TYPE_TARGET_TYPE (inner_array));
14860 inner_array = TYPE_TARGET_TYPE (inner_array);
14863 el_type = TYPE_TARGET_TYPE (inner_array);
14864 cnst |= TYPE_CONST (el_type);
14865 voltl |= TYPE_VOLATILE (el_type);
14866 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14868 return set_die_type (die, base_type, cu);
14871 static struct type *
14872 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14874 struct type *base_type, *cv_type;
14876 base_type = die_type (die, cu);
14878 /* The die_type call above may have already set the type for this DIE. */
14879 cv_type = get_die_type (die, cu);
14883 /* In case the const qualifier is applied to an array type, the element type
14884 is so qualified, not the array type (section 6.7.3 of C99). */
14885 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14886 return add_array_cv_type (die, cu, base_type, 1, 0);
14888 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14889 return set_die_type (die, cv_type, cu);
14892 static struct type *
14893 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14895 struct type *base_type, *cv_type;
14897 base_type = die_type (die, cu);
14899 /* The die_type call above may have already set the type for this DIE. */
14900 cv_type = get_die_type (die, cu);
14904 /* In case the volatile qualifier is applied to an array type, the
14905 element type is so qualified, not the array type (section 6.7.3
14907 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14908 return add_array_cv_type (die, cu, base_type, 0, 1);
14910 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14911 return set_die_type (die, cv_type, cu);
14914 /* Handle DW_TAG_restrict_type. */
14916 static struct type *
14917 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14919 struct type *base_type, *cv_type;
14921 base_type = die_type (die, cu);
14923 /* The die_type call above may have already set the type for this DIE. */
14924 cv_type = get_die_type (die, cu);
14928 cv_type = make_restrict_type (base_type);
14929 return set_die_type (die, cv_type, cu);
14932 /* Handle DW_TAG_atomic_type. */
14934 static struct type *
14935 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14937 struct type *base_type, *cv_type;
14939 base_type = die_type (die, cu);
14941 /* The die_type call above may have already set the type for this DIE. */
14942 cv_type = get_die_type (die, cu);
14946 cv_type = make_atomic_type (base_type);
14947 return set_die_type (die, cv_type, cu);
14950 /* Extract all information from a DW_TAG_string_type DIE and add to
14951 the user defined type vector. It isn't really a user defined type,
14952 but it behaves like one, with other DIE's using an AT_user_def_type
14953 attribute to reference it. */
14955 static struct type *
14956 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14958 struct objfile *objfile = cu->objfile;
14959 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14960 struct type *type, *range_type, *index_type, *char_type;
14961 struct attribute *attr;
14962 unsigned int length;
14964 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14967 length = DW_UNSND (attr);
14971 /* Check for the DW_AT_byte_size attribute. */
14972 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14975 length = DW_UNSND (attr);
14983 index_type = objfile_type (objfile)->builtin_int;
14984 range_type = create_static_range_type (NULL, index_type, 1, length);
14985 char_type = language_string_char_type (cu->language_defn, gdbarch);
14986 type = create_string_type (NULL, char_type, range_type);
14988 return set_die_type (die, type, cu);
14991 /* Assuming that DIE corresponds to a function, returns nonzero
14992 if the function is prototyped. */
14995 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14997 struct attribute *attr;
14999 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
15000 if (attr && (DW_UNSND (attr) != 0))
15003 /* The DWARF standard implies that the DW_AT_prototyped attribute
15004 is only meaninful for C, but the concept also extends to other
15005 languages that allow unprototyped functions (Eg: Objective C).
15006 For all other languages, assume that functions are always
15008 if (cu->language != language_c
15009 && cu->language != language_objc
15010 && cu->language != language_opencl)
15013 /* RealView does not emit DW_AT_prototyped. We can not distinguish
15014 prototyped and unprototyped functions; default to prototyped,
15015 since that is more common in modern code (and RealView warns
15016 about unprototyped functions). */
15017 if (producer_is_realview (cu->producer))
15023 /* Handle DIES due to C code like:
15027 int (*funcp)(int a, long l);
15031 ('funcp' generates a DW_TAG_subroutine_type DIE). */
15033 static struct type *
15034 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
15036 struct objfile *objfile = cu->objfile;
15037 struct type *type; /* Type that this function returns. */
15038 struct type *ftype; /* Function that returns above type. */
15039 struct attribute *attr;
15041 type = die_type (die, cu);
15043 /* The die_type call above may have already set the type for this DIE. */
15044 ftype = get_die_type (die, cu);
15048 ftype = lookup_function_type (type);
15050 if (prototyped_function_p (die, cu))
15051 TYPE_PROTOTYPED (ftype) = 1;
15053 /* Store the calling convention in the type if it's available in
15054 the subroutine die. Otherwise set the calling convention to
15055 the default value DW_CC_normal. */
15056 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15058 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
15059 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
15060 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
15062 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
15064 /* Record whether the function returns normally to its caller or not
15065 if the DWARF producer set that information. */
15066 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
15067 if (attr && (DW_UNSND (attr) != 0))
15068 TYPE_NO_RETURN (ftype) = 1;
15070 /* We need to add the subroutine type to the die immediately so
15071 we don't infinitely recurse when dealing with parameters
15072 declared as the same subroutine type. */
15073 set_die_type (die, ftype, cu);
15075 if (die->child != NULL)
15077 struct type *void_type = objfile_type (objfile)->builtin_void;
15078 struct die_info *child_die;
15079 int nparams, iparams;
15081 /* Count the number of parameters.
15082 FIXME: GDB currently ignores vararg functions, but knows about
15083 vararg member functions. */
15085 child_die = die->child;
15086 while (child_die && child_die->tag)
15088 if (child_die->tag == DW_TAG_formal_parameter)
15090 else if (child_die->tag == DW_TAG_unspecified_parameters)
15091 TYPE_VARARGS (ftype) = 1;
15092 child_die = sibling_die (child_die);
15095 /* Allocate storage for parameters and fill them in. */
15096 TYPE_NFIELDS (ftype) = nparams;
15097 TYPE_FIELDS (ftype) = (struct field *)
15098 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15100 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15101 even if we error out during the parameters reading below. */
15102 for (iparams = 0; iparams < nparams; iparams++)
15103 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15106 child_die = die->child;
15107 while (child_die && child_die->tag)
15109 if (child_die->tag == DW_TAG_formal_parameter)
15111 struct type *arg_type;
15113 /* DWARF version 2 has no clean way to discern C++
15114 static and non-static member functions. G++ helps
15115 GDB by marking the first parameter for non-static
15116 member functions (which is the this pointer) as
15117 artificial. We pass this information to
15118 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15120 DWARF version 3 added DW_AT_object_pointer, which GCC
15121 4.5 does not yet generate. */
15122 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15124 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15126 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15127 arg_type = die_type (child_die, cu);
15129 /* RealView does not mark THIS as const, which the testsuite
15130 expects. GCC marks THIS as const in method definitions,
15131 but not in the class specifications (GCC PR 43053). */
15132 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
15133 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
15136 struct dwarf2_cu *arg_cu = cu;
15137 const char *name = dwarf2_name (child_die, cu);
15139 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
15142 /* If the compiler emits this, use it. */
15143 if (follow_die_ref (die, attr, &arg_cu) == child_die)
15146 else if (name && strcmp (name, "this") == 0)
15147 /* Function definitions will have the argument names. */
15149 else if (name == NULL && iparams == 0)
15150 /* Declarations may not have the names, so like
15151 elsewhere in GDB, assume an artificial first
15152 argument is "this". */
15156 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
15160 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
15163 child_die = sibling_die (child_die);
15170 static struct type *
15171 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15173 struct objfile *objfile = cu->objfile;
15174 const char *name = NULL;
15175 struct type *this_type, *target_type;
15177 name = dwarf2_full_name (NULL, die, cu);
15178 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15179 TYPE_TARGET_STUB (this_type) = 1;
15180 set_die_type (die, this_type, cu);
15181 target_type = die_type (die, cu);
15182 if (target_type != this_type)
15183 TYPE_TARGET_TYPE (this_type) = target_type;
15186 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15187 spec and cause infinite loops in GDB. */
15188 complaint (&symfile_complaints,
15189 _("Self-referential DW_TAG_typedef "
15190 "- DIE at 0x%x [in module %s]"),
15191 to_underlying (die->sect_off), objfile_name (objfile));
15192 TYPE_TARGET_TYPE (this_type) = NULL;
15197 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15198 (which may be different from NAME) to the architecture back-end to allow
15199 it to guess the correct format if necessary. */
15201 static struct type *
15202 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15203 const char *name_hint)
15205 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15206 const struct floatformat **format;
15209 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15211 type = init_float_type (objfile, bits, name, format);
15213 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
15218 /* Find a representation of a given base type and install
15219 it in the TYPE field of the die. */
15221 static struct type *
15222 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15224 struct objfile *objfile = cu->objfile;
15226 struct attribute *attr;
15227 int encoding = 0, bits = 0;
15230 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15233 encoding = DW_UNSND (attr);
15235 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15238 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15240 name = dwarf2_name (die, cu);
15243 complaint (&symfile_complaints,
15244 _("DW_AT_name missing from DW_TAG_base_type"));
15249 case DW_ATE_address:
15250 /* Turn DW_ATE_address into a void * pointer. */
15251 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
15252 type = init_pointer_type (objfile, bits, name, type);
15254 case DW_ATE_boolean:
15255 type = init_boolean_type (objfile, bits, 1, name);
15257 case DW_ATE_complex_float:
15258 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15259 type = init_complex_type (objfile, name, type);
15261 case DW_ATE_decimal_float:
15262 type = init_decfloat_type (objfile, bits, name);
15265 type = dwarf2_init_float_type (objfile, bits, name, name);
15267 case DW_ATE_signed:
15268 type = init_integer_type (objfile, bits, 0, name);
15270 case DW_ATE_unsigned:
15271 if (cu->language == language_fortran
15273 && startswith (name, "character("))
15274 type = init_character_type (objfile, bits, 1, name);
15276 type = init_integer_type (objfile, bits, 1, name);
15278 case DW_ATE_signed_char:
15279 if (cu->language == language_ada || cu->language == language_m2
15280 || cu->language == language_pascal
15281 || cu->language == language_fortran)
15282 type = init_character_type (objfile, bits, 0, name);
15284 type = init_integer_type (objfile, bits, 0, name);
15286 case DW_ATE_unsigned_char:
15287 if (cu->language == language_ada || cu->language == language_m2
15288 || cu->language == language_pascal
15289 || cu->language == language_fortran
15290 || cu->language == language_rust)
15291 type = init_character_type (objfile, bits, 1, name);
15293 type = init_integer_type (objfile, bits, 1, name);
15297 gdbarch *arch = get_objfile_arch (objfile);
15300 type = builtin_type (arch)->builtin_char16;
15301 else if (bits == 32)
15302 type = builtin_type (arch)->builtin_char32;
15305 complaint (&symfile_complaints,
15306 _("unsupported DW_ATE_UTF bit size: '%d'"),
15308 type = init_integer_type (objfile, bits, 1, name);
15310 return set_die_type (die, type, cu);
15315 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15316 dwarf_type_encoding_name (encoding));
15317 type = init_type (objfile, TYPE_CODE_ERROR,
15318 bits / TARGET_CHAR_BIT, name);
15322 if (name && strcmp (name, "char") == 0)
15323 TYPE_NOSIGN (type) = 1;
15325 return set_die_type (die, type, cu);
15328 /* Parse dwarf attribute if it's a block, reference or constant and put the
15329 resulting value of the attribute into struct bound_prop.
15330 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15333 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15334 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15336 struct dwarf2_property_baton *baton;
15337 struct obstack *obstack = &cu->objfile->objfile_obstack;
15339 if (attr == NULL || prop == NULL)
15342 if (attr_form_is_block (attr))
15344 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15345 baton->referenced_type = NULL;
15346 baton->locexpr.per_cu = cu->per_cu;
15347 baton->locexpr.size = DW_BLOCK (attr)->size;
15348 baton->locexpr.data = DW_BLOCK (attr)->data;
15349 prop->data.baton = baton;
15350 prop->kind = PROP_LOCEXPR;
15351 gdb_assert (prop->data.baton != NULL);
15353 else if (attr_form_is_ref (attr))
15355 struct dwarf2_cu *target_cu = cu;
15356 struct die_info *target_die;
15357 struct attribute *target_attr;
15359 target_die = follow_die_ref (die, attr, &target_cu);
15360 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15361 if (target_attr == NULL)
15362 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15364 if (target_attr == NULL)
15367 switch (target_attr->name)
15369 case DW_AT_location:
15370 if (attr_form_is_section_offset (target_attr))
15372 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15373 baton->referenced_type = die_type (target_die, target_cu);
15374 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15375 prop->data.baton = baton;
15376 prop->kind = PROP_LOCLIST;
15377 gdb_assert (prop->data.baton != NULL);
15379 else if (attr_form_is_block (target_attr))
15381 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15382 baton->referenced_type = die_type (target_die, target_cu);
15383 baton->locexpr.per_cu = cu->per_cu;
15384 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15385 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15386 prop->data.baton = baton;
15387 prop->kind = PROP_LOCEXPR;
15388 gdb_assert (prop->data.baton != NULL);
15392 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15393 "dynamic property");
15397 case DW_AT_data_member_location:
15401 if (!handle_data_member_location (target_die, target_cu,
15405 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15406 baton->referenced_type = read_type_die (target_die->parent,
15408 baton->offset_info.offset = offset;
15409 baton->offset_info.type = die_type (target_die, target_cu);
15410 prop->data.baton = baton;
15411 prop->kind = PROP_ADDR_OFFSET;
15416 else if (attr_form_is_constant (attr))
15418 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
15419 prop->kind = PROP_CONST;
15423 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
15424 dwarf2_name (die, cu));
15431 /* Read the given DW_AT_subrange DIE. */
15433 static struct type *
15434 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
15436 struct type *base_type, *orig_base_type;
15437 struct type *range_type;
15438 struct attribute *attr;
15439 struct dynamic_prop low, high;
15440 int low_default_is_valid;
15441 int high_bound_is_count = 0;
15443 LONGEST negative_mask;
15445 orig_base_type = die_type (die, cu);
15446 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
15447 whereas the real type might be. So, we use ORIG_BASE_TYPE when
15448 creating the range type, but we use the result of check_typedef
15449 when examining properties of the type. */
15450 base_type = check_typedef (orig_base_type);
15452 /* The die_type call above may have already set the type for this DIE. */
15453 range_type = get_die_type (die, cu);
15457 low.kind = PROP_CONST;
15458 high.kind = PROP_CONST;
15459 high.data.const_val = 0;
15461 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
15462 omitting DW_AT_lower_bound. */
15463 switch (cu->language)
15466 case language_cplus:
15467 low.data.const_val = 0;
15468 low_default_is_valid = 1;
15470 case language_fortran:
15471 low.data.const_val = 1;
15472 low_default_is_valid = 1;
15475 case language_objc:
15476 case language_rust:
15477 low.data.const_val = 0;
15478 low_default_is_valid = (cu->header.version >= 4);
15482 case language_pascal:
15483 low.data.const_val = 1;
15484 low_default_is_valid = (cu->header.version >= 4);
15487 low.data.const_val = 0;
15488 low_default_is_valid = 0;
15492 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15494 attr_to_dynamic_prop (attr, die, cu, &low);
15495 else if (!low_default_is_valid)
15496 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15497 "- DIE at 0x%x [in module %s]"),
15498 to_underlying (die->sect_off), objfile_name (cu->objfile));
15500 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15501 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15503 attr = dwarf2_attr (die, DW_AT_count, cu);
15504 if (attr_to_dynamic_prop (attr, die, cu, &high))
15506 /* If bounds are constant do the final calculation here. */
15507 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15508 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15510 high_bound_is_count = 1;
15514 /* Dwarf-2 specifications explicitly allows to create subrange types
15515 without specifying a base type.
15516 In that case, the base type must be set to the type of
15517 the lower bound, upper bound or count, in that order, if any of these
15518 three attributes references an object that has a type.
15519 If no base type is found, the Dwarf-2 specifications say that
15520 a signed integer type of size equal to the size of an address should
15522 For the following C code: `extern char gdb_int [];'
15523 GCC produces an empty range DIE.
15524 FIXME: muller/2010-05-28: Possible references to object for low bound,
15525 high bound or count are not yet handled by this code. */
15526 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15528 struct objfile *objfile = cu->objfile;
15529 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15530 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15531 struct type *int_type = objfile_type (objfile)->builtin_int;
15533 /* Test "int", "long int", and "long long int" objfile types,
15534 and select the first one having a size above or equal to the
15535 architecture address size. */
15536 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15537 base_type = int_type;
15540 int_type = objfile_type (objfile)->builtin_long;
15541 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15542 base_type = int_type;
15545 int_type = objfile_type (objfile)->builtin_long_long;
15546 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15547 base_type = int_type;
15552 /* Normally, the DWARF producers are expected to use a signed
15553 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15554 But this is unfortunately not always the case, as witnessed
15555 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15556 is used instead. To work around that ambiguity, we treat
15557 the bounds as signed, and thus sign-extend their values, when
15558 the base type is signed. */
15560 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15561 if (low.kind == PROP_CONST
15562 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15563 low.data.const_val |= negative_mask;
15564 if (high.kind == PROP_CONST
15565 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15566 high.data.const_val |= negative_mask;
15568 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15570 if (high_bound_is_count)
15571 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15573 /* Ada expects an empty array on no boundary attributes. */
15574 if (attr == NULL && cu->language != language_ada)
15575 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15577 name = dwarf2_name (die, cu);
15579 TYPE_NAME (range_type) = name;
15581 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15583 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15585 set_die_type (die, range_type, cu);
15587 /* set_die_type should be already done. */
15588 set_descriptive_type (range_type, die, cu);
15593 static struct type *
15594 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15598 /* For now, we only support the C meaning of an unspecified type: void. */
15600 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15601 TYPE_NAME (type) = dwarf2_name (die, cu);
15603 return set_die_type (die, type, cu);
15606 /* Read a single die and all its descendents. Set the die's sibling
15607 field to NULL; set other fields in the die correctly, and set all
15608 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15609 location of the info_ptr after reading all of those dies. PARENT
15610 is the parent of the die in question. */
15612 static struct die_info *
15613 read_die_and_children (const struct die_reader_specs *reader,
15614 const gdb_byte *info_ptr,
15615 const gdb_byte **new_info_ptr,
15616 struct die_info *parent)
15618 struct die_info *die;
15619 const gdb_byte *cur_ptr;
15622 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15625 *new_info_ptr = cur_ptr;
15628 store_in_ref_table (die, reader->cu);
15631 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15635 *new_info_ptr = cur_ptr;
15638 die->sibling = NULL;
15639 die->parent = parent;
15643 /* Read a die, all of its descendents, and all of its siblings; set
15644 all of the fields of all of the dies correctly. Arguments are as
15645 in read_die_and_children. */
15647 static struct die_info *
15648 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15649 const gdb_byte *info_ptr,
15650 const gdb_byte **new_info_ptr,
15651 struct die_info *parent)
15653 struct die_info *first_die, *last_sibling;
15654 const gdb_byte *cur_ptr;
15656 cur_ptr = info_ptr;
15657 first_die = last_sibling = NULL;
15661 struct die_info *die
15662 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15666 *new_info_ptr = cur_ptr;
15673 last_sibling->sibling = die;
15675 last_sibling = die;
15679 /* Read a die, all of its descendents, and all of its siblings; set
15680 all of the fields of all of the dies correctly. Arguments are as
15681 in read_die_and_children.
15682 This the main entry point for reading a DIE and all its children. */
15684 static struct die_info *
15685 read_die_and_siblings (const struct die_reader_specs *reader,
15686 const gdb_byte *info_ptr,
15687 const gdb_byte **new_info_ptr,
15688 struct die_info *parent)
15690 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15691 new_info_ptr, parent);
15693 if (dwarf_die_debug)
15695 fprintf_unfiltered (gdb_stdlog,
15696 "Read die from %s@0x%x of %s:\n",
15697 get_section_name (reader->die_section),
15698 (unsigned) (info_ptr - reader->die_section->buffer),
15699 bfd_get_filename (reader->abfd));
15700 dump_die (die, dwarf_die_debug);
15706 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15708 The caller is responsible for filling in the extra attributes
15709 and updating (*DIEP)->num_attrs.
15710 Set DIEP to point to a newly allocated die with its information,
15711 except for its child, sibling, and parent fields.
15712 Set HAS_CHILDREN to tell whether the die has children or not. */
15714 static const gdb_byte *
15715 read_full_die_1 (const struct die_reader_specs *reader,
15716 struct die_info **diep, const gdb_byte *info_ptr,
15717 int *has_children, int num_extra_attrs)
15719 unsigned int abbrev_number, bytes_read, i;
15720 struct abbrev_info *abbrev;
15721 struct die_info *die;
15722 struct dwarf2_cu *cu = reader->cu;
15723 bfd *abfd = reader->abfd;
15725 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
15726 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15727 info_ptr += bytes_read;
15728 if (!abbrev_number)
15735 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15737 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15739 bfd_get_filename (abfd));
15741 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15742 die->sect_off = sect_off;
15743 die->tag = abbrev->tag;
15744 die->abbrev = abbrev_number;
15746 /* Make the result usable.
15747 The caller needs to update num_attrs after adding the extra
15749 die->num_attrs = abbrev->num_attrs;
15751 for (i = 0; i < abbrev->num_attrs; ++i)
15752 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15756 *has_children = abbrev->has_children;
15760 /* Read a die and all its attributes.
15761 Set DIEP to point to a newly allocated die with its information,
15762 except for its child, sibling, and parent fields.
15763 Set HAS_CHILDREN to tell whether the die has children or not. */
15765 static const gdb_byte *
15766 read_full_die (const struct die_reader_specs *reader,
15767 struct die_info **diep, const gdb_byte *info_ptr,
15770 const gdb_byte *result;
15772 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15774 if (dwarf_die_debug)
15776 fprintf_unfiltered (gdb_stdlog,
15777 "Read die from %s@0x%x of %s:\n",
15778 get_section_name (reader->die_section),
15779 (unsigned) (info_ptr - reader->die_section->buffer),
15780 bfd_get_filename (reader->abfd));
15781 dump_die (*diep, dwarf_die_debug);
15787 /* Abbreviation tables.
15789 In DWARF version 2, the description of the debugging information is
15790 stored in a separate .debug_abbrev section. Before we read any
15791 dies from a section we read in all abbreviations and install them
15792 in a hash table. */
15794 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15796 static struct abbrev_info *
15797 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15799 struct abbrev_info *abbrev;
15801 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15802 memset (abbrev, 0, sizeof (struct abbrev_info));
15807 /* Add an abbreviation to the table. */
15810 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15811 unsigned int abbrev_number,
15812 struct abbrev_info *abbrev)
15814 unsigned int hash_number;
15816 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15817 abbrev->next = abbrev_table->abbrevs[hash_number];
15818 abbrev_table->abbrevs[hash_number] = abbrev;
15821 /* Look up an abbrev in the table.
15822 Returns NULL if the abbrev is not found. */
15824 static struct abbrev_info *
15825 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15826 unsigned int abbrev_number)
15828 unsigned int hash_number;
15829 struct abbrev_info *abbrev;
15831 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15832 abbrev = abbrev_table->abbrevs[hash_number];
15836 if (abbrev->number == abbrev_number)
15838 abbrev = abbrev->next;
15843 /* Read in an abbrev table. */
15845 static struct abbrev_table *
15846 abbrev_table_read_table (struct dwarf2_section_info *section,
15847 sect_offset sect_off)
15849 struct objfile *objfile = dwarf2_per_objfile->objfile;
15850 bfd *abfd = get_section_bfd_owner (section);
15851 struct abbrev_table *abbrev_table;
15852 const gdb_byte *abbrev_ptr;
15853 struct abbrev_info *cur_abbrev;
15854 unsigned int abbrev_number, bytes_read, abbrev_name;
15855 unsigned int abbrev_form;
15856 struct attr_abbrev *cur_attrs;
15857 unsigned int allocated_attrs;
15859 abbrev_table = XNEW (struct abbrev_table);
15860 abbrev_table->sect_off = sect_off;
15861 obstack_init (&abbrev_table->abbrev_obstack);
15862 abbrev_table->abbrevs =
15863 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15865 memset (abbrev_table->abbrevs, 0,
15866 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15868 dwarf2_read_section (objfile, section);
15869 abbrev_ptr = section->buffer + to_underlying (sect_off);
15870 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15871 abbrev_ptr += bytes_read;
15873 allocated_attrs = ATTR_ALLOC_CHUNK;
15874 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15876 /* Loop until we reach an abbrev number of 0. */
15877 while (abbrev_number)
15879 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15881 /* read in abbrev header */
15882 cur_abbrev->number = abbrev_number;
15884 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15885 abbrev_ptr += bytes_read;
15886 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15889 /* now read in declarations */
15892 LONGEST implicit_const;
15894 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15895 abbrev_ptr += bytes_read;
15896 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15897 abbrev_ptr += bytes_read;
15898 if (abbrev_form == DW_FORM_implicit_const)
15900 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
15902 abbrev_ptr += bytes_read;
15906 /* Initialize it due to a false compiler warning. */
15907 implicit_const = -1;
15910 if (abbrev_name == 0)
15913 if (cur_abbrev->num_attrs == allocated_attrs)
15915 allocated_attrs += ATTR_ALLOC_CHUNK;
15917 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15920 cur_attrs[cur_abbrev->num_attrs].name
15921 = (enum dwarf_attribute) abbrev_name;
15922 cur_attrs[cur_abbrev->num_attrs].form
15923 = (enum dwarf_form) abbrev_form;
15924 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
15925 ++cur_abbrev->num_attrs;
15928 cur_abbrev->attrs =
15929 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15930 cur_abbrev->num_attrs);
15931 memcpy (cur_abbrev->attrs, cur_attrs,
15932 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15934 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15936 /* Get next abbreviation.
15937 Under Irix6 the abbreviations for a compilation unit are not
15938 always properly terminated with an abbrev number of 0.
15939 Exit loop if we encounter an abbreviation which we have
15940 already read (which means we are about to read the abbreviations
15941 for the next compile unit) or if the end of the abbreviation
15942 table is reached. */
15943 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15945 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15946 abbrev_ptr += bytes_read;
15947 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15952 return abbrev_table;
15955 /* Free the resources held by ABBREV_TABLE. */
15958 abbrev_table_free (struct abbrev_table *abbrev_table)
15960 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15961 xfree (abbrev_table);
15964 /* Same as abbrev_table_free but as a cleanup.
15965 We pass in a pointer to the pointer to the table so that we can
15966 set the pointer to NULL when we're done. It also simplifies
15967 build_type_psymtabs_1. */
15970 abbrev_table_free_cleanup (void *table_ptr)
15972 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15974 if (*abbrev_table_ptr != NULL)
15975 abbrev_table_free (*abbrev_table_ptr);
15976 *abbrev_table_ptr = NULL;
15979 /* Read the abbrev table for CU from ABBREV_SECTION. */
15982 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15983 struct dwarf2_section_info *abbrev_section)
15986 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
15989 /* Release the memory used by the abbrev table for a compilation unit. */
15992 dwarf2_free_abbrev_table (void *ptr_to_cu)
15994 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
15996 if (cu->abbrev_table != NULL)
15997 abbrev_table_free (cu->abbrev_table);
15998 /* Set this to NULL so that we SEGV if we try to read it later,
15999 and also because free_comp_unit verifies this is NULL. */
16000 cu->abbrev_table = NULL;
16003 /* Returns nonzero if TAG represents a type that we might generate a partial
16007 is_type_tag_for_partial (int tag)
16012 /* Some types that would be reasonable to generate partial symbols for,
16013 that we don't at present. */
16014 case DW_TAG_array_type:
16015 case DW_TAG_file_type:
16016 case DW_TAG_ptr_to_member_type:
16017 case DW_TAG_set_type:
16018 case DW_TAG_string_type:
16019 case DW_TAG_subroutine_type:
16021 case DW_TAG_base_type:
16022 case DW_TAG_class_type:
16023 case DW_TAG_interface_type:
16024 case DW_TAG_enumeration_type:
16025 case DW_TAG_structure_type:
16026 case DW_TAG_subrange_type:
16027 case DW_TAG_typedef:
16028 case DW_TAG_union_type:
16035 /* Load all DIEs that are interesting for partial symbols into memory. */
16037 static struct partial_die_info *
16038 load_partial_dies (const struct die_reader_specs *reader,
16039 const gdb_byte *info_ptr, int building_psymtab)
16041 struct dwarf2_cu *cu = reader->cu;
16042 struct objfile *objfile = cu->objfile;
16043 struct partial_die_info *part_die;
16044 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
16045 struct abbrev_info *abbrev;
16046 unsigned int bytes_read;
16047 unsigned int load_all = 0;
16048 int nesting_level = 1;
16053 gdb_assert (cu->per_cu != NULL);
16054 if (cu->per_cu->load_all_dies)
16058 = htab_create_alloc_ex (cu->header.length / 12,
16062 &cu->comp_unit_obstack,
16063 hashtab_obstack_allocate,
16064 dummy_obstack_deallocate);
16066 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16070 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
16072 /* A NULL abbrev means the end of a series of children. */
16073 if (abbrev == NULL)
16075 if (--nesting_level == 0)
16077 /* PART_DIE was probably the last thing allocated on the
16078 comp_unit_obstack, so we could call obstack_free
16079 here. We don't do that because the waste is small,
16080 and will be cleaned up when we're done with this
16081 compilation unit. This way, we're also more robust
16082 against other users of the comp_unit_obstack. */
16085 info_ptr += bytes_read;
16086 last_die = parent_die;
16087 parent_die = parent_die->die_parent;
16091 /* Check for template arguments. We never save these; if
16092 they're seen, we just mark the parent, and go on our way. */
16093 if (parent_die != NULL
16094 && cu->language == language_cplus
16095 && (abbrev->tag == DW_TAG_template_type_param
16096 || abbrev->tag == DW_TAG_template_value_param))
16098 parent_die->has_template_arguments = 1;
16102 /* We don't need a partial DIE for the template argument. */
16103 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16108 /* We only recurse into c++ subprograms looking for template arguments.
16109 Skip their other children. */
16111 && cu->language == language_cplus
16112 && parent_die != NULL
16113 && parent_die->tag == DW_TAG_subprogram)
16115 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16119 /* Check whether this DIE is interesting enough to save. Normally
16120 we would not be interested in members here, but there may be
16121 later variables referencing them via DW_AT_specification (for
16122 static members). */
16124 && !is_type_tag_for_partial (abbrev->tag)
16125 && abbrev->tag != DW_TAG_constant
16126 && abbrev->tag != DW_TAG_enumerator
16127 && abbrev->tag != DW_TAG_subprogram
16128 && abbrev->tag != DW_TAG_lexical_block
16129 && abbrev->tag != DW_TAG_variable
16130 && abbrev->tag != DW_TAG_namespace
16131 && abbrev->tag != DW_TAG_module
16132 && abbrev->tag != DW_TAG_member
16133 && abbrev->tag != DW_TAG_imported_unit
16134 && abbrev->tag != DW_TAG_imported_declaration)
16136 /* Otherwise we skip to the next sibling, if any. */
16137 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16141 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
16144 /* This two-pass algorithm for processing partial symbols has a
16145 high cost in cache pressure. Thus, handle some simple cases
16146 here which cover the majority of C partial symbols. DIEs
16147 which neither have specification tags in them, nor could have
16148 specification tags elsewhere pointing at them, can simply be
16149 processed and discarded.
16151 This segment is also optional; scan_partial_symbols and
16152 add_partial_symbol will handle these DIEs if we chain
16153 them in normally. When compilers which do not emit large
16154 quantities of duplicate debug information are more common,
16155 this code can probably be removed. */
16157 /* Any complete simple types at the top level (pretty much all
16158 of them, for a language without namespaces), can be processed
16160 if (parent_die == NULL
16161 && part_die->has_specification == 0
16162 && part_die->is_declaration == 0
16163 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
16164 || part_die->tag == DW_TAG_base_type
16165 || part_die->tag == DW_TAG_subrange_type))
16167 if (building_psymtab && part_die->name != NULL)
16168 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16169 VAR_DOMAIN, LOC_TYPEDEF,
16170 &objfile->static_psymbols,
16171 0, cu->language, objfile);
16172 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16176 /* The exception for DW_TAG_typedef with has_children above is
16177 a workaround of GCC PR debug/47510. In the case of this complaint
16178 type_name_no_tag_or_error will error on such types later.
16180 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16181 it could not find the child DIEs referenced later, this is checked
16182 above. In correct DWARF DW_TAG_typedef should have no children. */
16184 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16185 complaint (&symfile_complaints,
16186 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16187 "- DIE at 0x%x [in module %s]"),
16188 to_underlying (part_die->sect_off), objfile_name (objfile));
16190 /* If we're at the second level, and we're an enumerator, and
16191 our parent has no specification (meaning possibly lives in a
16192 namespace elsewhere), then we can add the partial symbol now
16193 instead of queueing it. */
16194 if (part_die->tag == DW_TAG_enumerator
16195 && parent_die != NULL
16196 && parent_die->die_parent == NULL
16197 && parent_die->tag == DW_TAG_enumeration_type
16198 && parent_die->has_specification == 0)
16200 if (part_die->name == NULL)
16201 complaint (&symfile_complaints,
16202 _("malformed enumerator DIE ignored"));
16203 else if (building_psymtab)
16204 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16205 VAR_DOMAIN, LOC_CONST,
16206 cu->language == language_cplus
16207 ? &objfile->global_psymbols
16208 : &objfile->static_psymbols,
16209 0, cu->language, objfile);
16211 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16215 /* We'll save this DIE so link it in. */
16216 part_die->die_parent = parent_die;
16217 part_die->die_sibling = NULL;
16218 part_die->die_child = NULL;
16220 if (last_die && last_die == parent_die)
16221 last_die->die_child = part_die;
16223 last_die->die_sibling = part_die;
16225 last_die = part_die;
16227 if (first_die == NULL)
16228 first_die = part_die;
16230 /* Maybe add the DIE to the hash table. Not all DIEs that we
16231 find interesting need to be in the hash table, because we
16232 also have the parent/sibling/child chains; only those that we
16233 might refer to by offset later during partial symbol reading.
16235 For now this means things that might have be the target of a
16236 DW_AT_specification, DW_AT_abstract_origin, or
16237 DW_AT_extension. DW_AT_extension will refer only to
16238 namespaces; DW_AT_abstract_origin refers to functions (and
16239 many things under the function DIE, but we do not recurse
16240 into function DIEs during partial symbol reading) and
16241 possibly variables as well; DW_AT_specification refers to
16242 declarations. Declarations ought to have the DW_AT_declaration
16243 flag. It happens that GCC forgets to put it in sometimes, but
16244 only for functions, not for types.
16246 Adding more things than necessary to the hash table is harmless
16247 except for the performance cost. Adding too few will result in
16248 wasted time in find_partial_die, when we reread the compilation
16249 unit with load_all_dies set. */
16252 || abbrev->tag == DW_TAG_constant
16253 || abbrev->tag == DW_TAG_subprogram
16254 || abbrev->tag == DW_TAG_variable
16255 || abbrev->tag == DW_TAG_namespace
16256 || part_die->is_declaration)
16260 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16261 to_underlying (part_die->sect_off),
16266 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16268 /* For some DIEs we want to follow their children (if any). For C
16269 we have no reason to follow the children of structures; for other
16270 languages we have to, so that we can get at method physnames
16271 to infer fully qualified class names, for DW_AT_specification,
16272 and for C++ template arguments. For C++, we also look one level
16273 inside functions to find template arguments (if the name of the
16274 function does not already contain the template arguments).
16276 For Ada, we need to scan the children of subprograms and lexical
16277 blocks as well because Ada allows the definition of nested
16278 entities that could be interesting for the debugger, such as
16279 nested subprograms for instance. */
16280 if (last_die->has_children
16282 || last_die->tag == DW_TAG_namespace
16283 || last_die->tag == DW_TAG_module
16284 || last_die->tag == DW_TAG_enumeration_type
16285 || (cu->language == language_cplus
16286 && last_die->tag == DW_TAG_subprogram
16287 && (last_die->name == NULL
16288 || strchr (last_die->name, '<') == NULL))
16289 || (cu->language != language_c
16290 && (last_die->tag == DW_TAG_class_type
16291 || last_die->tag == DW_TAG_interface_type
16292 || last_die->tag == DW_TAG_structure_type
16293 || last_die->tag == DW_TAG_union_type))
16294 || (cu->language == language_ada
16295 && (last_die->tag == DW_TAG_subprogram
16296 || last_die->tag == DW_TAG_lexical_block))))
16299 parent_die = last_die;
16303 /* Otherwise we skip to the next sibling, if any. */
16304 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16306 /* Back to the top, do it again. */
16310 /* Read a minimal amount of information into the minimal die structure. */
16312 static const gdb_byte *
16313 read_partial_die (const struct die_reader_specs *reader,
16314 struct partial_die_info *part_die,
16315 struct abbrev_info *abbrev, unsigned int abbrev_len,
16316 const gdb_byte *info_ptr)
16318 struct dwarf2_cu *cu = reader->cu;
16319 struct objfile *objfile = cu->objfile;
16320 const gdb_byte *buffer = reader->buffer;
16322 struct attribute attr;
16323 int has_low_pc_attr = 0;
16324 int has_high_pc_attr = 0;
16325 int high_pc_relative = 0;
16327 memset (part_die, 0, sizeof (struct partial_die_info));
16329 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16331 info_ptr += abbrev_len;
16333 if (abbrev == NULL)
16336 part_die->tag = abbrev->tag;
16337 part_die->has_children = abbrev->has_children;
16339 for (i = 0; i < abbrev->num_attrs; ++i)
16341 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16343 /* Store the data if it is of an attribute we want to keep in a
16344 partial symbol table. */
16348 switch (part_die->tag)
16350 case DW_TAG_compile_unit:
16351 case DW_TAG_partial_unit:
16352 case DW_TAG_type_unit:
16353 /* Compilation units have a DW_AT_name that is a filename, not
16354 a source language identifier. */
16355 case DW_TAG_enumeration_type:
16356 case DW_TAG_enumerator:
16357 /* These tags always have simple identifiers already; no need
16358 to canonicalize them. */
16359 part_die->name = DW_STRING (&attr);
16363 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16364 &objfile->per_bfd->storage_obstack);
16368 case DW_AT_linkage_name:
16369 case DW_AT_MIPS_linkage_name:
16370 /* Note that both forms of linkage name might appear. We
16371 assume they will be the same, and we only store the last
16373 if (cu->language == language_ada)
16374 part_die->name = DW_STRING (&attr);
16375 part_die->linkage_name = DW_STRING (&attr);
16378 has_low_pc_attr = 1;
16379 part_die->lowpc = attr_value_as_address (&attr);
16381 case DW_AT_high_pc:
16382 has_high_pc_attr = 1;
16383 part_die->highpc = attr_value_as_address (&attr);
16384 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16385 high_pc_relative = 1;
16387 case DW_AT_location:
16388 /* Support the .debug_loc offsets. */
16389 if (attr_form_is_block (&attr))
16391 part_die->d.locdesc = DW_BLOCK (&attr);
16393 else if (attr_form_is_section_offset (&attr))
16395 dwarf2_complex_location_expr_complaint ();
16399 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16400 "partial symbol information");
16403 case DW_AT_external:
16404 part_die->is_external = DW_UNSND (&attr);
16406 case DW_AT_declaration:
16407 part_die->is_declaration = DW_UNSND (&attr);
16410 part_die->has_type = 1;
16412 case DW_AT_abstract_origin:
16413 case DW_AT_specification:
16414 case DW_AT_extension:
16415 part_die->has_specification = 1;
16416 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
16417 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16418 || cu->per_cu->is_dwz);
16420 case DW_AT_sibling:
16421 /* Ignore absolute siblings, they might point outside of
16422 the current compile unit. */
16423 if (attr.form == DW_FORM_ref_addr)
16424 complaint (&symfile_complaints,
16425 _("ignoring absolute DW_AT_sibling"));
16428 sect_offset off = dwarf2_get_ref_die_offset (&attr);
16429 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
16431 if (sibling_ptr < info_ptr)
16432 complaint (&symfile_complaints,
16433 _("DW_AT_sibling points backwards"));
16434 else if (sibling_ptr > reader->buffer_end)
16435 dwarf2_section_buffer_overflow_complaint (reader->die_section);
16437 part_die->sibling = sibling_ptr;
16440 case DW_AT_byte_size:
16441 part_die->has_byte_size = 1;
16443 case DW_AT_const_value:
16444 part_die->has_const_value = 1;
16446 case DW_AT_calling_convention:
16447 /* DWARF doesn't provide a way to identify a program's source-level
16448 entry point. DW_AT_calling_convention attributes are only meant
16449 to describe functions' calling conventions.
16451 However, because it's a necessary piece of information in
16452 Fortran, and before DWARF 4 DW_CC_program was the only
16453 piece of debugging information whose definition refers to
16454 a 'main program' at all, several compilers marked Fortran
16455 main programs with DW_CC_program --- even when those
16456 functions use the standard calling conventions.
16458 Although DWARF now specifies a way to provide this
16459 information, we support this practice for backward
16461 if (DW_UNSND (&attr) == DW_CC_program
16462 && cu->language == language_fortran)
16463 part_die->main_subprogram = 1;
16466 if (DW_UNSND (&attr) == DW_INL_inlined
16467 || DW_UNSND (&attr) == DW_INL_declared_inlined)
16468 part_die->may_be_inlined = 1;
16472 if (part_die->tag == DW_TAG_imported_unit)
16474 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
16475 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16476 || cu->per_cu->is_dwz);
16480 case DW_AT_main_subprogram:
16481 part_die->main_subprogram = DW_UNSND (&attr);
16489 if (high_pc_relative)
16490 part_die->highpc += part_die->lowpc;
16492 if (has_low_pc_attr && has_high_pc_attr)
16494 /* When using the GNU linker, .gnu.linkonce. sections are used to
16495 eliminate duplicate copies of functions and vtables and such.
16496 The linker will arbitrarily choose one and discard the others.
16497 The AT_*_pc values for such functions refer to local labels in
16498 these sections. If the section from that file was discarded, the
16499 labels are not in the output, so the relocs get a value of 0.
16500 If this is a discarded function, mark the pc bounds as invalid,
16501 so that GDB will ignore it. */
16502 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
16504 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16506 complaint (&symfile_complaints,
16507 _("DW_AT_low_pc %s is zero "
16508 "for DIE at 0x%x [in module %s]"),
16509 paddress (gdbarch, part_die->lowpc),
16510 to_underlying (part_die->sect_off), objfile_name (objfile));
16512 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16513 else if (part_die->lowpc >= part_die->highpc)
16515 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16517 complaint (&symfile_complaints,
16518 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16519 "for DIE at 0x%x [in module %s]"),
16520 paddress (gdbarch, part_die->lowpc),
16521 paddress (gdbarch, part_die->highpc),
16522 to_underlying (part_die->sect_off),
16523 objfile_name (objfile));
16526 part_die->has_pc_info = 1;
16532 /* Find a cached partial DIE at OFFSET in CU. */
16534 static struct partial_die_info *
16535 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
16537 struct partial_die_info *lookup_die = NULL;
16538 struct partial_die_info part_die;
16540 part_die.sect_off = sect_off;
16541 lookup_die = ((struct partial_die_info *)
16542 htab_find_with_hash (cu->partial_dies, &part_die,
16543 to_underlying (sect_off)));
16548 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16549 except in the case of .debug_types DIEs which do not reference
16550 outside their CU (they do however referencing other types via
16551 DW_FORM_ref_sig8). */
16553 static struct partial_die_info *
16554 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
16556 struct objfile *objfile = cu->objfile;
16557 struct dwarf2_per_cu_data *per_cu = NULL;
16558 struct partial_die_info *pd = NULL;
16560 if (offset_in_dwz == cu->per_cu->is_dwz
16561 && offset_in_cu_p (&cu->header, sect_off))
16563 pd = find_partial_die_in_comp_unit (sect_off, cu);
16566 /* We missed recording what we needed.
16567 Load all dies and try again. */
16568 per_cu = cu->per_cu;
16572 /* TUs don't reference other CUs/TUs (except via type signatures). */
16573 if (cu->per_cu->is_debug_types)
16575 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
16576 " external reference to offset 0x%x [in module %s].\n"),
16577 to_underlying (cu->header.sect_off), to_underlying (sect_off),
16578 bfd_get_filename (objfile->obfd));
16580 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
16583 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16584 load_partial_comp_unit (per_cu);
16586 per_cu->cu->last_used = 0;
16587 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16590 /* If we didn't find it, and not all dies have been loaded,
16591 load them all and try again. */
16593 if (pd == NULL && per_cu->load_all_dies == 0)
16595 per_cu->load_all_dies = 1;
16597 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16598 THIS_CU->cu may already be in use. So we can't just free it and
16599 replace its DIEs with the ones we read in. Instead, we leave those
16600 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16601 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16603 load_partial_comp_unit (per_cu);
16605 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16609 internal_error (__FILE__, __LINE__,
16610 _("could not find partial DIE 0x%x "
16611 "in cache [from module %s]\n"),
16612 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
16616 /* See if we can figure out if the class lives in a namespace. We do
16617 this by looking for a member function; its demangled name will
16618 contain namespace info, if there is any. */
16621 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16622 struct dwarf2_cu *cu)
16624 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16625 what template types look like, because the demangler
16626 frequently doesn't give the same name as the debug info. We
16627 could fix this by only using the demangled name to get the
16628 prefix (but see comment in read_structure_type). */
16630 struct partial_die_info *real_pdi;
16631 struct partial_die_info *child_pdi;
16633 /* If this DIE (this DIE's specification, if any) has a parent, then
16634 we should not do this. We'll prepend the parent's fully qualified
16635 name when we create the partial symbol. */
16637 real_pdi = struct_pdi;
16638 while (real_pdi->has_specification)
16639 real_pdi = find_partial_die (real_pdi->spec_offset,
16640 real_pdi->spec_is_dwz, cu);
16642 if (real_pdi->die_parent != NULL)
16645 for (child_pdi = struct_pdi->die_child;
16647 child_pdi = child_pdi->die_sibling)
16649 if (child_pdi->tag == DW_TAG_subprogram
16650 && child_pdi->linkage_name != NULL)
16652 char *actual_class_name
16653 = language_class_name_from_physname (cu->language_defn,
16654 child_pdi->linkage_name);
16655 if (actual_class_name != NULL)
16659 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16661 strlen (actual_class_name)));
16662 xfree (actual_class_name);
16669 /* Adjust PART_DIE before generating a symbol for it. This function
16670 may set the is_external flag or change the DIE's name. */
16673 fixup_partial_die (struct partial_die_info *part_die,
16674 struct dwarf2_cu *cu)
16676 /* Once we've fixed up a die, there's no point in doing so again.
16677 This also avoids a memory leak if we were to call
16678 guess_partial_die_structure_name multiple times. */
16679 if (part_die->fixup_called)
16682 /* If we found a reference attribute and the DIE has no name, try
16683 to find a name in the referred to DIE. */
16685 if (part_die->name == NULL && part_die->has_specification)
16687 struct partial_die_info *spec_die;
16689 spec_die = find_partial_die (part_die->spec_offset,
16690 part_die->spec_is_dwz, cu);
16692 fixup_partial_die (spec_die, cu);
16694 if (spec_die->name)
16696 part_die->name = spec_die->name;
16698 /* Copy DW_AT_external attribute if it is set. */
16699 if (spec_die->is_external)
16700 part_die->is_external = spec_die->is_external;
16704 /* Set default names for some unnamed DIEs. */
16706 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16707 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16709 /* If there is no parent die to provide a namespace, and there are
16710 children, see if we can determine the namespace from their linkage
16712 if (cu->language == language_cplus
16713 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16714 && part_die->die_parent == NULL
16715 && part_die->has_children
16716 && (part_die->tag == DW_TAG_class_type
16717 || part_die->tag == DW_TAG_structure_type
16718 || part_die->tag == DW_TAG_union_type))
16719 guess_partial_die_structure_name (part_die, cu);
16721 /* GCC might emit a nameless struct or union that has a linkage
16722 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16723 if (part_die->name == NULL
16724 && (part_die->tag == DW_TAG_class_type
16725 || part_die->tag == DW_TAG_interface_type
16726 || part_die->tag == DW_TAG_structure_type
16727 || part_die->tag == DW_TAG_union_type)
16728 && part_die->linkage_name != NULL)
16732 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16737 /* Strip any leading namespaces/classes, keep only the base name.
16738 DW_AT_name for named DIEs does not contain the prefixes. */
16739 base = strrchr (demangled, ':');
16740 if (base && base > demangled && base[-1] == ':')
16747 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16748 base, strlen (base)));
16753 part_die->fixup_called = 1;
16756 /* Read an attribute value described by an attribute form. */
16758 static const gdb_byte *
16759 read_attribute_value (const struct die_reader_specs *reader,
16760 struct attribute *attr, unsigned form,
16761 LONGEST implicit_const, const gdb_byte *info_ptr)
16763 struct dwarf2_cu *cu = reader->cu;
16764 struct objfile *objfile = cu->objfile;
16765 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16766 bfd *abfd = reader->abfd;
16767 struct comp_unit_head *cu_header = &cu->header;
16768 unsigned int bytes_read;
16769 struct dwarf_block *blk;
16771 attr->form = (enum dwarf_form) form;
16774 case DW_FORM_ref_addr:
16775 if (cu->header.version == 2)
16776 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16778 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16779 &cu->header, &bytes_read);
16780 info_ptr += bytes_read;
16782 case DW_FORM_GNU_ref_alt:
16783 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16784 info_ptr += bytes_read;
16787 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16788 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16789 info_ptr += bytes_read;
16791 case DW_FORM_block2:
16792 blk = dwarf_alloc_block (cu);
16793 blk->size = read_2_bytes (abfd, info_ptr);
16795 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16796 info_ptr += blk->size;
16797 DW_BLOCK (attr) = blk;
16799 case DW_FORM_block4:
16800 blk = dwarf_alloc_block (cu);
16801 blk->size = read_4_bytes (abfd, info_ptr);
16803 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16804 info_ptr += blk->size;
16805 DW_BLOCK (attr) = blk;
16807 case DW_FORM_data2:
16808 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16811 case DW_FORM_data4:
16812 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16815 case DW_FORM_data8:
16816 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16819 case DW_FORM_data16:
16820 blk = dwarf_alloc_block (cu);
16822 blk->data = read_n_bytes (abfd, info_ptr, 16);
16824 DW_BLOCK (attr) = blk;
16826 case DW_FORM_sec_offset:
16827 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16828 info_ptr += bytes_read;
16830 case DW_FORM_string:
16831 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16832 DW_STRING_IS_CANONICAL (attr) = 0;
16833 info_ptr += bytes_read;
16836 if (!cu->per_cu->is_dwz)
16838 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16840 DW_STRING_IS_CANONICAL (attr) = 0;
16841 info_ptr += bytes_read;
16845 case DW_FORM_line_strp:
16846 if (!cu->per_cu->is_dwz)
16848 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
16849 cu_header, &bytes_read);
16850 DW_STRING_IS_CANONICAL (attr) = 0;
16851 info_ptr += bytes_read;
16855 case DW_FORM_GNU_strp_alt:
16857 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16858 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16861 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16862 DW_STRING_IS_CANONICAL (attr) = 0;
16863 info_ptr += bytes_read;
16866 case DW_FORM_exprloc:
16867 case DW_FORM_block:
16868 blk = dwarf_alloc_block (cu);
16869 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16870 info_ptr += bytes_read;
16871 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16872 info_ptr += blk->size;
16873 DW_BLOCK (attr) = blk;
16875 case DW_FORM_block1:
16876 blk = dwarf_alloc_block (cu);
16877 blk->size = read_1_byte (abfd, info_ptr);
16879 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16880 info_ptr += blk->size;
16881 DW_BLOCK (attr) = blk;
16883 case DW_FORM_data1:
16884 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16888 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16891 case DW_FORM_flag_present:
16892 DW_UNSND (attr) = 1;
16894 case DW_FORM_sdata:
16895 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16896 info_ptr += bytes_read;
16898 case DW_FORM_udata:
16899 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16900 info_ptr += bytes_read;
16903 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16904 + read_1_byte (abfd, info_ptr));
16908 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16909 + read_2_bytes (abfd, info_ptr));
16913 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16914 + read_4_bytes (abfd, info_ptr));
16918 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16919 + read_8_bytes (abfd, info_ptr));
16922 case DW_FORM_ref_sig8:
16923 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16926 case DW_FORM_ref_udata:
16927 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16928 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16929 info_ptr += bytes_read;
16931 case DW_FORM_indirect:
16932 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16933 info_ptr += bytes_read;
16934 if (form == DW_FORM_implicit_const)
16936 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16937 info_ptr += bytes_read;
16939 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
16942 case DW_FORM_implicit_const:
16943 DW_SND (attr) = implicit_const;
16945 case DW_FORM_GNU_addr_index:
16946 if (reader->dwo_file == NULL)
16948 /* For now flag a hard error.
16949 Later we can turn this into a complaint. */
16950 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16951 dwarf_form_name (form),
16952 bfd_get_filename (abfd));
16954 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16955 info_ptr += bytes_read;
16957 case DW_FORM_GNU_str_index:
16958 if (reader->dwo_file == NULL)
16960 /* For now flag a hard error.
16961 Later we can turn this into a complaint if warranted. */
16962 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16963 dwarf_form_name (form),
16964 bfd_get_filename (abfd));
16967 ULONGEST str_index =
16968 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16970 DW_STRING (attr) = read_str_index (reader, str_index);
16971 DW_STRING_IS_CANONICAL (attr) = 0;
16972 info_ptr += bytes_read;
16976 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16977 dwarf_form_name (form),
16978 bfd_get_filename (abfd));
16982 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16983 attr->form = DW_FORM_GNU_ref_alt;
16985 /* We have seen instances where the compiler tried to emit a byte
16986 size attribute of -1 which ended up being encoded as an unsigned
16987 0xffffffff. Although 0xffffffff is technically a valid size value,
16988 an object of this size seems pretty unlikely so we can relatively
16989 safely treat these cases as if the size attribute was invalid and
16990 treat them as zero by default. */
16991 if (attr->name == DW_AT_byte_size
16992 && form == DW_FORM_data4
16993 && DW_UNSND (attr) >= 0xffffffff)
16996 (&symfile_complaints,
16997 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16998 hex_string (DW_UNSND (attr)));
16999 DW_UNSND (attr) = 0;
17005 /* Read an attribute described by an abbreviated attribute. */
17007 static const gdb_byte *
17008 read_attribute (const struct die_reader_specs *reader,
17009 struct attribute *attr, struct attr_abbrev *abbrev,
17010 const gdb_byte *info_ptr)
17012 attr->name = abbrev->name;
17013 return read_attribute_value (reader, attr, abbrev->form,
17014 abbrev->implicit_const, info_ptr);
17017 /* Read dwarf information from a buffer. */
17019 static unsigned int
17020 read_1_byte (bfd *abfd, const gdb_byte *buf)
17022 return bfd_get_8 (abfd, buf);
17026 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
17028 return bfd_get_signed_8 (abfd, buf);
17031 static unsigned int
17032 read_2_bytes (bfd *abfd, const gdb_byte *buf)
17034 return bfd_get_16 (abfd, buf);
17038 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
17040 return bfd_get_signed_16 (abfd, buf);
17043 static unsigned int
17044 read_4_bytes (bfd *abfd, const gdb_byte *buf)
17046 return bfd_get_32 (abfd, buf);
17050 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
17052 return bfd_get_signed_32 (abfd, buf);
17056 read_8_bytes (bfd *abfd, const gdb_byte *buf)
17058 return bfd_get_64 (abfd, buf);
17062 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
17063 unsigned int *bytes_read)
17065 struct comp_unit_head *cu_header = &cu->header;
17066 CORE_ADDR retval = 0;
17068 if (cu_header->signed_addr_p)
17070 switch (cu_header->addr_size)
17073 retval = bfd_get_signed_16 (abfd, buf);
17076 retval = bfd_get_signed_32 (abfd, buf);
17079 retval = bfd_get_signed_64 (abfd, buf);
17082 internal_error (__FILE__, __LINE__,
17083 _("read_address: bad switch, signed [in module %s]"),
17084 bfd_get_filename (abfd));
17089 switch (cu_header->addr_size)
17092 retval = bfd_get_16 (abfd, buf);
17095 retval = bfd_get_32 (abfd, buf);
17098 retval = bfd_get_64 (abfd, buf);
17101 internal_error (__FILE__, __LINE__,
17102 _("read_address: bad switch, "
17103 "unsigned [in module %s]"),
17104 bfd_get_filename (abfd));
17108 *bytes_read = cu_header->addr_size;
17112 /* Read the initial length from a section. The (draft) DWARF 3
17113 specification allows the initial length to take up either 4 bytes
17114 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17115 bytes describe the length and all offsets will be 8 bytes in length
17118 An older, non-standard 64-bit format is also handled by this
17119 function. The older format in question stores the initial length
17120 as an 8-byte quantity without an escape value. Lengths greater
17121 than 2^32 aren't very common which means that the initial 4 bytes
17122 is almost always zero. Since a length value of zero doesn't make
17123 sense for the 32-bit format, this initial zero can be considered to
17124 be an escape value which indicates the presence of the older 64-bit
17125 format. As written, the code can't detect (old format) lengths
17126 greater than 4GB. If it becomes necessary to handle lengths
17127 somewhat larger than 4GB, we could allow other small values (such
17128 as the non-sensical values of 1, 2, and 3) to also be used as
17129 escape values indicating the presence of the old format.
17131 The value returned via bytes_read should be used to increment the
17132 relevant pointer after calling read_initial_length().
17134 [ Note: read_initial_length() and read_offset() are based on the
17135 document entitled "DWARF Debugging Information Format", revision
17136 3, draft 8, dated November 19, 2001. This document was obtained
17139 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
17141 This document is only a draft and is subject to change. (So beware.)
17143 Details regarding the older, non-standard 64-bit format were
17144 determined empirically by examining 64-bit ELF files produced by
17145 the SGI toolchain on an IRIX 6.5 machine.
17147 - Kevin, July 16, 2002
17151 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
17153 LONGEST length = bfd_get_32 (abfd, buf);
17155 if (length == 0xffffffff)
17157 length = bfd_get_64 (abfd, buf + 4);
17160 else if (length == 0)
17162 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
17163 length = bfd_get_64 (abfd, buf);
17174 /* Cover function for read_initial_length.
17175 Returns the length of the object at BUF, and stores the size of the
17176 initial length in *BYTES_READ and stores the size that offsets will be in
17178 If the initial length size is not equivalent to that specified in
17179 CU_HEADER then issue a complaint.
17180 This is useful when reading non-comp-unit headers. */
17183 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17184 const struct comp_unit_head *cu_header,
17185 unsigned int *bytes_read,
17186 unsigned int *offset_size)
17188 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17190 gdb_assert (cu_header->initial_length_size == 4
17191 || cu_header->initial_length_size == 8
17192 || cu_header->initial_length_size == 12);
17194 if (cu_header->initial_length_size != *bytes_read)
17195 complaint (&symfile_complaints,
17196 _("intermixed 32-bit and 64-bit DWARF sections"));
17198 *offset_size = (*bytes_read == 4) ? 4 : 8;
17202 /* Read an offset from the data stream. The size of the offset is
17203 given by cu_header->offset_size. */
17206 read_offset (bfd *abfd, const gdb_byte *buf,
17207 const struct comp_unit_head *cu_header,
17208 unsigned int *bytes_read)
17210 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17212 *bytes_read = cu_header->offset_size;
17216 /* Read an offset from the data stream. */
17219 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17221 LONGEST retval = 0;
17223 switch (offset_size)
17226 retval = bfd_get_32 (abfd, buf);
17229 retval = bfd_get_64 (abfd, buf);
17232 internal_error (__FILE__, __LINE__,
17233 _("read_offset_1: bad switch [in module %s]"),
17234 bfd_get_filename (abfd));
17240 static const gdb_byte *
17241 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17243 /* If the size of a host char is 8 bits, we can return a pointer
17244 to the buffer, otherwise we have to copy the data to a buffer
17245 allocated on the temporary obstack. */
17246 gdb_assert (HOST_CHAR_BIT == 8);
17250 static const char *
17251 read_direct_string (bfd *abfd, const gdb_byte *buf,
17252 unsigned int *bytes_read_ptr)
17254 /* If the size of a host char is 8 bits, we can return a pointer
17255 to the string, otherwise we have to copy the string to a buffer
17256 allocated on the temporary obstack. */
17257 gdb_assert (HOST_CHAR_BIT == 8);
17260 *bytes_read_ptr = 1;
17263 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17264 return (const char *) buf;
17267 /* Return pointer to string at section SECT offset STR_OFFSET with error
17268 reporting strings FORM_NAME and SECT_NAME. */
17270 static const char *
17271 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17272 struct dwarf2_section_info *sect,
17273 const char *form_name,
17274 const char *sect_name)
17276 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17277 if (sect->buffer == NULL)
17278 error (_("%s used without %s section [in module %s]"),
17279 form_name, sect_name, bfd_get_filename (abfd));
17280 if (str_offset >= sect->size)
17281 error (_("%s pointing outside of %s section [in module %s]"),
17282 form_name, sect_name, bfd_get_filename (abfd));
17283 gdb_assert (HOST_CHAR_BIT == 8);
17284 if (sect->buffer[str_offset] == '\0')
17286 return (const char *) (sect->buffer + str_offset);
17289 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17291 static const char *
17292 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17294 return read_indirect_string_at_offset_from (abfd, str_offset,
17295 &dwarf2_per_objfile->str,
17296 "DW_FORM_strp", ".debug_str");
17299 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17301 static const char *
17302 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17304 return read_indirect_string_at_offset_from (abfd, str_offset,
17305 &dwarf2_per_objfile->line_str,
17306 "DW_FORM_line_strp",
17307 ".debug_line_str");
17310 /* Read a string at offset STR_OFFSET in the .debug_str section from
17311 the .dwz file DWZ. Throw an error if the offset is too large. If
17312 the string consists of a single NUL byte, return NULL; otherwise
17313 return a pointer to the string. */
17315 static const char *
17316 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17318 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17320 if (dwz->str.buffer == NULL)
17321 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17322 "section [in module %s]"),
17323 bfd_get_filename (dwz->dwz_bfd));
17324 if (str_offset >= dwz->str.size)
17325 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17326 ".debug_str section [in module %s]"),
17327 bfd_get_filename (dwz->dwz_bfd));
17328 gdb_assert (HOST_CHAR_BIT == 8);
17329 if (dwz->str.buffer[str_offset] == '\0')
17331 return (const char *) (dwz->str.buffer + str_offset);
17334 /* Return pointer to string at .debug_str offset as read from BUF.
17335 BUF is assumed to be in a compilation unit described by CU_HEADER.
17336 Return *BYTES_READ_PTR count of bytes read from BUF. */
17338 static const char *
17339 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17340 const struct comp_unit_head *cu_header,
17341 unsigned int *bytes_read_ptr)
17343 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17345 return read_indirect_string_at_offset (abfd, str_offset);
17348 /* Return pointer to string at .debug_line_str offset as read from BUF.
17349 BUF is assumed to be in a compilation unit described by CU_HEADER.
17350 Return *BYTES_READ_PTR count of bytes read from BUF. */
17352 static const char *
17353 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17354 const struct comp_unit_head *cu_header,
17355 unsigned int *bytes_read_ptr)
17357 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17359 return read_indirect_line_string_at_offset (abfd, str_offset);
17363 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17364 unsigned int *bytes_read_ptr)
17367 unsigned int num_read;
17369 unsigned char byte;
17376 byte = bfd_get_8 (abfd, buf);
17379 result |= ((ULONGEST) (byte & 127) << shift);
17380 if ((byte & 128) == 0)
17386 *bytes_read_ptr = num_read;
17391 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17392 unsigned int *bytes_read_ptr)
17395 int shift, num_read;
17396 unsigned char byte;
17403 byte = bfd_get_8 (abfd, buf);
17406 result |= ((LONGEST) (byte & 127) << shift);
17408 if ((byte & 128) == 0)
17413 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
17414 result |= -(((LONGEST) 1) << shift);
17415 *bytes_read_ptr = num_read;
17419 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
17420 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
17421 ADDR_SIZE is the size of addresses from the CU header. */
17424 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
17426 struct objfile *objfile = dwarf2_per_objfile->objfile;
17427 bfd *abfd = objfile->obfd;
17428 const gdb_byte *info_ptr;
17430 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
17431 if (dwarf2_per_objfile->addr.buffer == NULL)
17432 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
17433 objfile_name (objfile));
17434 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
17435 error (_("DW_FORM_addr_index pointing outside of "
17436 ".debug_addr section [in module %s]"),
17437 objfile_name (objfile));
17438 info_ptr = (dwarf2_per_objfile->addr.buffer
17439 + addr_base + addr_index * addr_size);
17440 if (addr_size == 4)
17441 return bfd_get_32 (abfd, info_ptr);
17443 return bfd_get_64 (abfd, info_ptr);
17446 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
17449 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
17451 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
17454 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
17457 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
17458 unsigned int *bytes_read)
17460 bfd *abfd = cu->objfile->obfd;
17461 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
17463 return read_addr_index (cu, addr_index);
17466 /* Data structure to pass results from dwarf2_read_addr_index_reader
17467 back to dwarf2_read_addr_index. */
17469 struct dwarf2_read_addr_index_data
17471 ULONGEST addr_base;
17475 /* die_reader_func for dwarf2_read_addr_index. */
17478 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
17479 const gdb_byte *info_ptr,
17480 struct die_info *comp_unit_die,
17484 struct dwarf2_cu *cu = reader->cu;
17485 struct dwarf2_read_addr_index_data *aidata =
17486 (struct dwarf2_read_addr_index_data *) data;
17488 aidata->addr_base = cu->addr_base;
17489 aidata->addr_size = cu->header.addr_size;
17492 /* Given an index in .debug_addr, fetch the value.
17493 NOTE: This can be called during dwarf expression evaluation,
17494 long after the debug information has been read, and thus per_cu->cu
17495 may no longer exist. */
17498 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
17499 unsigned int addr_index)
17501 struct objfile *objfile = per_cu->objfile;
17502 struct dwarf2_cu *cu = per_cu->cu;
17503 ULONGEST addr_base;
17506 /* This is intended to be called from outside this file. */
17507 dw2_setup (objfile);
17509 /* We need addr_base and addr_size.
17510 If we don't have PER_CU->cu, we have to get it.
17511 Nasty, but the alternative is storing the needed info in PER_CU,
17512 which at this point doesn't seem justified: it's not clear how frequently
17513 it would get used and it would increase the size of every PER_CU.
17514 Entry points like dwarf2_per_cu_addr_size do a similar thing
17515 so we're not in uncharted territory here.
17516 Alas we need to be a bit more complicated as addr_base is contained
17519 We don't need to read the entire CU(/TU).
17520 We just need the header and top level die.
17522 IWBN to use the aging mechanism to let us lazily later discard the CU.
17523 For now we skip this optimization. */
17527 addr_base = cu->addr_base;
17528 addr_size = cu->header.addr_size;
17532 struct dwarf2_read_addr_index_data aidata;
17534 /* Note: We can't use init_cutu_and_read_dies_simple here,
17535 we need addr_base. */
17536 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
17537 dwarf2_read_addr_index_reader, &aidata);
17538 addr_base = aidata.addr_base;
17539 addr_size = aidata.addr_size;
17542 return read_addr_index_1 (addr_index, addr_base, addr_size);
17545 /* Given a DW_FORM_GNU_str_index, fetch the string.
17546 This is only used by the Fission support. */
17548 static const char *
17549 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
17551 struct objfile *objfile = dwarf2_per_objfile->objfile;
17552 const char *objf_name = objfile_name (objfile);
17553 bfd *abfd = objfile->obfd;
17554 struct dwarf2_cu *cu = reader->cu;
17555 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
17556 struct dwarf2_section_info *str_offsets_section =
17557 &reader->dwo_file->sections.str_offsets;
17558 const gdb_byte *info_ptr;
17559 ULONGEST str_offset;
17560 static const char form_name[] = "DW_FORM_GNU_str_index";
17562 dwarf2_read_section (objfile, str_section);
17563 dwarf2_read_section (objfile, str_offsets_section);
17564 if (str_section->buffer == NULL)
17565 error (_("%s used without .debug_str.dwo section"
17566 " in CU at offset 0x%x [in module %s]"),
17567 form_name, to_underlying (cu->header.sect_off), objf_name);
17568 if (str_offsets_section->buffer == NULL)
17569 error (_("%s used without .debug_str_offsets.dwo section"
17570 " in CU at offset 0x%x [in module %s]"),
17571 form_name, to_underlying (cu->header.sect_off), objf_name);
17572 if (str_index * cu->header.offset_size >= str_offsets_section->size)
17573 error (_("%s pointing outside of .debug_str_offsets.dwo"
17574 " section in CU at offset 0x%x [in module %s]"),
17575 form_name, to_underlying (cu->header.sect_off), objf_name);
17576 info_ptr = (str_offsets_section->buffer
17577 + str_index * cu->header.offset_size);
17578 if (cu->header.offset_size == 4)
17579 str_offset = bfd_get_32 (abfd, info_ptr);
17581 str_offset = bfd_get_64 (abfd, info_ptr);
17582 if (str_offset >= str_section->size)
17583 error (_("Offset from %s pointing outside of"
17584 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
17585 form_name, to_underlying (cu->header.sect_off), objf_name);
17586 return (const char *) (str_section->buffer + str_offset);
17589 /* Return the length of an LEB128 number in BUF. */
17592 leb128_size (const gdb_byte *buf)
17594 const gdb_byte *begin = buf;
17600 if ((byte & 128) == 0)
17601 return buf - begin;
17606 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17615 cu->language = language_c;
17618 case DW_LANG_C_plus_plus:
17619 case DW_LANG_C_plus_plus_11:
17620 case DW_LANG_C_plus_plus_14:
17621 cu->language = language_cplus;
17624 cu->language = language_d;
17626 case DW_LANG_Fortran77:
17627 case DW_LANG_Fortran90:
17628 case DW_LANG_Fortran95:
17629 case DW_LANG_Fortran03:
17630 case DW_LANG_Fortran08:
17631 cu->language = language_fortran;
17634 cu->language = language_go;
17636 case DW_LANG_Mips_Assembler:
17637 cu->language = language_asm;
17639 case DW_LANG_Ada83:
17640 case DW_LANG_Ada95:
17641 cu->language = language_ada;
17643 case DW_LANG_Modula2:
17644 cu->language = language_m2;
17646 case DW_LANG_Pascal83:
17647 cu->language = language_pascal;
17650 cu->language = language_objc;
17653 case DW_LANG_Rust_old:
17654 cu->language = language_rust;
17656 case DW_LANG_Cobol74:
17657 case DW_LANG_Cobol85:
17659 cu->language = language_minimal;
17662 cu->language_defn = language_def (cu->language);
17665 /* Return the named attribute or NULL if not there. */
17667 static struct attribute *
17668 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17673 struct attribute *spec = NULL;
17675 for (i = 0; i < die->num_attrs; ++i)
17677 if (die->attrs[i].name == name)
17678 return &die->attrs[i];
17679 if (die->attrs[i].name == DW_AT_specification
17680 || die->attrs[i].name == DW_AT_abstract_origin)
17681 spec = &die->attrs[i];
17687 die = follow_die_ref (die, spec, &cu);
17693 /* Return the named attribute or NULL if not there,
17694 but do not follow DW_AT_specification, etc.
17695 This is for use in contexts where we're reading .debug_types dies.
17696 Following DW_AT_specification, DW_AT_abstract_origin will take us
17697 back up the chain, and we want to go down. */
17699 static struct attribute *
17700 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17704 for (i = 0; i < die->num_attrs; ++i)
17705 if (die->attrs[i].name == name)
17706 return &die->attrs[i];
17711 /* Return the string associated with a string-typed attribute, or NULL if it
17712 is either not found or is of an incorrect type. */
17714 static const char *
17715 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17717 struct attribute *attr;
17718 const char *str = NULL;
17720 attr = dwarf2_attr (die, name, cu);
17724 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
17725 || attr->form == DW_FORM_string
17726 || attr->form == DW_FORM_GNU_str_index
17727 || attr->form == DW_FORM_GNU_strp_alt)
17728 str = DW_STRING (attr);
17730 complaint (&symfile_complaints,
17731 _("string type expected for attribute %s for "
17732 "DIE at 0x%x in module %s"),
17733 dwarf_attr_name (name), to_underlying (die->sect_off),
17734 objfile_name (cu->objfile));
17740 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17741 and holds a non-zero value. This function should only be used for
17742 DW_FORM_flag or DW_FORM_flag_present attributes. */
17745 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17747 struct attribute *attr = dwarf2_attr (die, name, cu);
17749 return (attr && DW_UNSND (attr));
17753 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17755 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17756 which value is non-zero. However, we have to be careful with
17757 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17758 (via dwarf2_flag_true_p) follows this attribute. So we may
17759 end up accidently finding a declaration attribute that belongs
17760 to a different DIE referenced by the specification attribute,
17761 even though the given DIE does not have a declaration attribute. */
17762 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17763 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17766 /* Return the die giving the specification for DIE, if there is
17767 one. *SPEC_CU is the CU containing DIE on input, and the CU
17768 containing the return value on output. If there is no
17769 specification, but there is an abstract origin, that is
17772 static struct die_info *
17773 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17775 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17778 if (spec_attr == NULL)
17779 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17781 if (spec_attr == NULL)
17784 return follow_die_ref (die, spec_attr, spec_cu);
17787 /* Stub for free_line_header to match void * callback types. */
17790 free_line_header_voidp (void *arg)
17792 struct line_header *lh = (struct line_header *) arg;
17798 line_header::add_include_dir (const char *include_dir)
17800 if (dwarf_line_debug >= 2)
17801 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
17802 include_dirs.size () + 1, include_dir);
17804 include_dirs.push_back (include_dir);
17808 line_header::add_file_name (const char *name,
17810 unsigned int mod_time,
17811 unsigned int length)
17813 if (dwarf_line_debug >= 2)
17814 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17815 (unsigned) file_names.size () + 1, name);
17817 file_names.emplace_back (name, d_index, mod_time, length);
17820 /* A convenience function to find the proper .debug_line section for a CU. */
17822 static struct dwarf2_section_info *
17823 get_debug_line_section (struct dwarf2_cu *cu)
17825 struct dwarf2_section_info *section;
17827 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17829 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17830 section = &cu->dwo_unit->dwo_file->sections.line;
17831 else if (cu->per_cu->is_dwz)
17833 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17835 section = &dwz->line;
17838 section = &dwarf2_per_objfile->line;
17843 /* Read directory or file name entry format, starting with byte of
17844 format count entries, ULEB128 pairs of entry formats, ULEB128 of
17845 entries count and the entries themselves in the described entry
17849 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
17850 struct line_header *lh,
17851 const struct comp_unit_head *cu_header,
17852 void (*callback) (struct line_header *lh,
17855 unsigned int mod_time,
17856 unsigned int length))
17858 gdb_byte format_count, formati;
17859 ULONGEST data_count, datai;
17860 const gdb_byte *buf = *bufp;
17861 const gdb_byte *format_header_data;
17863 unsigned int bytes_read;
17865 format_count = read_1_byte (abfd, buf);
17867 format_header_data = buf;
17868 for (formati = 0; formati < format_count; formati++)
17870 read_unsigned_leb128 (abfd, buf, &bytes_read);
17872 read_unsigned_leb128 (abfd, buf, &bytes_read);
17876 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
17878 for (datai = 0; datai < data_count; datai++)
17880 const gdb_byte *format = format_header_data;
17881 struct file_entry fe;
17883 for (formati = 0; formati < format_count; formati++)
17885 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
17886 format += bytes_read;
17888 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
17889 format += bytes_read;
17891 gdb::optional<const char *> string;
17892 gdb::optional<unsigned int> uint;
17896 case DW_FORM_string:
17897 string.emplace (read_direct_string (abfd, buf, &bytes_read));
17901 case DW_FORM_line_strp:
17902 string.emplace (read_indirect_line_string (abfd, buf,
17908 case DW_FORM_data1:
17909 uint.emplace (read_1_byte (abfd, buf));
17913 case DW_FORM_data2:
17914 uint.emplace (read_2_bytes (abfd, buf));
17918 case DW_FORM_data4:
17919 uint.emplace (read_4_bytes (abfd, buf));
17923 case DW_FORM_data8:
17924 uint.emplace (read_8_bytes (abfd, buf));
17928 case DW_FORM_udata:
17929 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
17933 case DW_FORM_block:
17934 /* It is valid only for DW_LNCT_timestamp which is ignored by
17939 switch (content_type)
17942 if (string.has_value ())
17945 case DW_LNCT_directory_index:
17946 if (uint.has_value ())
17947 fe.d_index = (dir_index) *uint;
17949 case DW_LNCT_timestamp:
17950 if (uint.has_value ())
17951 fe.mod_time = *uint;
17954 if (uint.has_value ())
17960 complaint (&symfile_complaints,
17961 _("Unknown format content type %s"),
17962 pulongest (content_type));
17966 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
17972 /* Read the statement program header starting at OFFSET in
17973 .debug_line, or .debug_line.dwo. Return a pointer
17974 to a struct line_header, allocated using xmalloc.
17975 Returns NULL if there is a problem reading the header, e.g., if it
17976 has a version we don't understand.
17978 NOTE: the strings in the include directory and file name tables of
17979 the returned object point into the dwarf line section buffer,
17980 and must not be freed. */
17982 static line_header_up
17983 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
17985 const gdb_byte *line_ptr;
17986 unsigned int bytes_read, offset_size;
17988 const char *cur_dir, *cur_file;
17989 struct dwarf2_section_info *section;
17992 section = get_debug_line_section (cu);
17993 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
17994 if (section->buffer == NULL)
17996 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17997 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
17999 complaint (&symfile_complaints, _("missing .debug_line section"));
18003 /* We can't do this until we know the section is non-empty.
18004 Only then do we know we have such a section. */
18005 abfd = get_section_bfd_owner (section);
18007 /* Make sure that at least there's room for the total_length field.
18008 That could be 12 bytes long, but we're just going to fudge that. */
18009 if (to_underlying (sect_off) + 4 >= section->size)
18011 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18015 line_header_up lh (new line_header ());
18017 lh->sect_off = sect_off;
18018 lh->offset_in_dwz = cu->per_cu->is_dwz;
18020 line_ptr = section->buffer + to_underlying (sect_off);
18022 /* Read in the header. */
18024 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
18025 &bytes_read, &offset_size);
18026 line_ptr += bytes_read;
18027 if (line_ptr + lh->total_length > (section->buffer + section->size))
18029 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18032 lh->statement_program_end = line_ptr + lh->total_length;
18033 lh->version = read_2_bytes (abfd, line_ptr);
18035 if (lh->version > 5)
18037 /* This is a version we don't understand. The format could have
18038 changed in ways we don't handle properly so just punt. */
18039 complaint (&symfile_complaints,
18040 _("unsupported version in .debug_line section"));
18043 if (lh->version >= 5)
18045 gdb_byte segment_selector_size;
18047 /* Skip address size. */
18048 read_1_byte (abfd, line_ptr);
18051 segment_selector_size = read_1_byte (abfd, line_ptr);
18053 if (segment_selector_size != 0)
18055 complaint (&symfile_complaints,
18056 _("unsupported segment selector size %u "
18057 "in .debug_line section"),
18058 segment_selector_size);
18062 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
18063 line_ptr += offset_size;
18064 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
18066 if (lh->version >= 4)
18068 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
18072 lh->maximum_ops_per_instruction = 1;
18074 if (lh->maximum_ops_per_instruction == 0)
18076 lh->maximum_ops_per_instruction = 1;
18077 complaint (&symfile_complaints,
18078 _("invalid maximum_ops_per_instruction "
18079 "in `.debug_line' section"));
18082 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
18084 lh->line_base = read_1_signed_byte (abfd, line_ptr);
18086 lh->line_range = read_1_byte (abfd, line_ptr);
18088 lh->opcode_base = read_1_byte (abfd, line_ptr);
18090 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
18092 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
18093 for (i = 1; i < lh->opcode_base; ++i)
18095 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
18099 if (lh->version >= 5)
18101 /* Read directory table. */
18102 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18103 [] (struct line_header *lh, const char *name,
18104 dir_index d_index, unsigned int mod_time,
18105 unsigned int length)
18107 lh->add_include_dir (name);
18110 /* Read file name table. */
18111 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18112 [] (struct line_header *lh, const char *name,
18113 dir_index d_index, unsigned int mod_time,
18114 unsigned int length)
18116 lh->add_file_name (name, d_index, mod_time, length);
18121 /* Read directory table. */
18122 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18124 line_ptr += bytes_read;
18125 lh->add_include_dir (cur_dir);
18127 line_ptr += bytes_read;
18129 /* Read file name table. */
18130 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18132 unsigned int mod_time, length;
18135 line_ptr += bytes_read;
18136 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18137 line_ptr += bytes_read;
18138 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18139 line_ptr += bytes_read;
18140 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18141 line_ptr += bytes_read;
18143 lh->add_file_name (cur_file, d_index, mod_time, length);
18145 line_ptr += bytes_read;
18147 lh->statement_program_start = line_ptr;
18149 if (line_ptr > (section->buffer + section->size))
18150 complaint (&symfile_complaints,
18151 _("line number info header doesn't "
18152 "fit in `.debug_line' section"));
18157 /* Subroutine of dwarf_decode_lines to simplify it.
18158 Return the file name of the psymtab for included file FILE_INDEX
18159 in line header LH of PST.
18160 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18161 If space for the result is malloc'd, it will be freed by a cleanup.
18162 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
18164 The function creates dangling cleanup registration. */
18166 static const char *
18167 psymtab_include_file_name (const struct line_header *lh, int file_index,
18168 const struct partial_symtab *pst,
18169 const char *comp_dir)
18171 const file_entry &fe = lh->file_names[file_index];
18172 const char *include_name = fe.name;
18173 const char *include_name_to_compare = include_name;
18174 const char *pst_filename;
18175 char *copied_name = NULL;
18178 const char *dir_name = fe.include_dir (lh);
18180 if (!IS_ABSOLUTE_PATH (include_name)
18181 && (dir_name != NULL || comp_dir != NULL))
18183 /* Avoid creating a duplicate psymtab for PST.
18184 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18185 Before we do the comparison, however, we need to account
18186 for DIR_NAME and COMP_DIR.
18187 First prepend dir_name (if non-NULL). If we still don't
18188 have an absolute path prepend comp_dir (if non-NULL).
18189 However, the directory we record in the include-file's
18190 psymtab does not contain COMP_DIR (to match the
18191 corresponding symtab(s)).
18196 bash$ gcc -g ./hello.c
18197 include_name = "hello.c"
18199 DW_AT_comp_dir = comp_dir = "/tmp"
18200 DW_AT_name = "./hello.c"
18204 if (dir_name != NULL)
18206 char *tem = concat (dir_name, SLASH_STRING,
18207 include_name, (char *)NULL);
18209 make_cleanup (xfree, tem);
18210 include_name = tem;
18211 include_name_to_compare = include_name;
18213 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18215 char *tem = concat (comp_dir, SLASH_STRING,
18216 include_name, (char *)NULL);
18218 make_cleanup (xfree, tem);
18219 include_name_to_compare = tem;
18223 pst_filename = pst->filename;
18224 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18226 copied_name = concat (pst->dirname, SLASH_STRING,
18227 pst_filename, (char *)NULL);
18228 pst_filename = copied_name;
18231 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18233 if (copied_name != NULL)
18234 xfree (copied_name);
18238 return include_name;
18241 /* State machine to track the state of the line number program. */
18243 class lnp_state_machine
18246 /* Initialize a machine state for the start of a line number
18248 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18250 file_entry *current_file ()
18252 /* lh->file_names is 0-based, but the file name numbers in the
18253 statement program are 1-based. */
18254 return m_line_header->file_name_at (m_file);
18257 /* Record the line in the state machine. END_SEQUENCE is true if
18258 we're processing the end of a sequence. */
18259 void record_line (bool end_sequence);
18261 /* Check address and if invalid nop-out the rest of the lines in this
18263 void check_line_address (struct dwarf2_cu *cu,
18264 const gdb_byte *line_ptr,
18265 CORE_ADDR lowpc, CORE_ADDR address);
18267 void handle_set_discriminator (unsigned int discriminator)
18269 m_discriminator = discriminator;
18270 m_line_has_non_zero_discriminator |= discriminator != 0;
18273 /* Handle DW_LNE_set_address. */
18274 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18277 address += baseaddr;
18278 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18281 /* Handle DW_LNS_advance_pc. */
18282 void handle_advance_pc (CORE_ADDR adjust);
18284 /* Handle a special opcode. */
18285 void handle_special_opcode (unsigned char op_code);
18287 /* Handle DW_LNS_advance_line. */
18288 void handle_advance_line (int line_delta)
18290 advance_line (line_delta);
18293 /* Handle DW_LNS_set_file. */
18294 void handle_set_file (file_name_index file);
18296 /* Handle DW_LNS_negate_stmt. */
18297 void handle_negate_stmt ()
18299 m_is_stmt = !m_is_stmt;
18302 /* Handle DW_LNS_const_add_pc. */
18303 void handle_const_add_pc ();
18305 /* Handle DW_LNS_fixed_advance_pc. */
18306 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18308 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18312 /* Handle DW_LNS_copy. */
18313 void handle_copy ()
18315 record_line (false);
18316 m_discriminator = 0;
18319 /* Handle DW_LNE_end_sequence. */
18320 void handle_end_sequence ()
18322 m_record_line_callback = ::record_line;
18326 /* Advance the line by LINE_DELTA. */
18327 void advance_line (int line_delta)
18329 m_line += line_delta;
18331 if (line_delta != 0)
18332 m_line_has_non_zero_discriminator = m_discriminator != 0;
18335 gdbarch *m_gdbarch;
18337 /* True if we're recording lines.
18338 Otherwise we're building partial symtabs and are just interested in
18339 finding include files mentioned by the line number program. */
18340 bool m_record_lines_p;
18342 /* The line number header. */
18343 line_header *m_line_header;
18345 /* These are part of the standard DWARF line number state machine,
18346 and initialized according to the DWARF spec. */
18348 unsigned char m_op_index = 0;
18349 /* The line table index (1-based) of the current file. */
18350 file_name_index m_file = (file_name_index) 1;
18351 unsigned int m_line = 1;
18353 /* These are initialized in the constructor. */
18355 CORE_ADDR m_address;
18357 unsigned int m_discriminator;
18359 /* Additional bits of state we need to track. */
18361 /* The last file that we called dwarf2_start_subfile for.
18362 This is only used for TLLs. */
18363 unsigned int m_last_file = 0;
18364 /* The last file a line number was recorded for. */
18365 struct subfile *m_last_subfile = NULL;
18367 /* The function to call to record a line. */
18368 record_line_ftype *m_record_line_callback = NULL;
18370 /* The last line number that was recorded, used to coalesce
18371 consecutive entries for the same line. This can happen, for
18372 example, when discriminators are present. PR 17276. */
18373 unsigned int m_last_line = 0;
18374 bool m_line_has_non_zero_discriminator = false;
18378 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18380 CORE_ADDR addr_adj = (((m_op_index + adjust)
18381 / m_line_header->maximum_ops_per_instruction)
18382 * m_line_header->minimum_instruction_length);
18383 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18384 m_op_index = ((m_op_index + adjust)
18385 % m_line_header->maximum_ops_per_instruction);
18389 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18391 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18392 CORE_ADDR addr_adj = (((m_op_index
18393 + (adj_opcode / m_line_header->line_range))
18394 / m_line_header->maximum_ops_per_instruction)
18395 * m_line_header->minimum_instruction_length);
18396 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18397 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18398 % m_line_header->maximum_ops_per_instruction);
18400 int line_delta = (m_line_header->line_base
18401 + (adj_opcode % m_line_header->line_range));
18402 advance_line (line_delta);
18403 record_line (false);
18404 m_discriminator = 0;
18408 lnp_state_machine::handle_set_file (file_name_index file)
18412 const file_entry *fe = current_file ();
18414 dwarf2_debug_line_missing_file_complaint ();
18415 else if (m_record_lines_p)
18417 const char *dir = fe->include_dir (m_line_header);
18419 m_last_subfile = current_subfile;
18420 m_line_has_non_zero_discriminator = m_discriminator != 0;
18421 dwarf2_start_subfile (fe->name, dir);
18426 lnp_state_machine::handle_const_add_pc ()
18429 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
18432 = (((m_op_index + adjust)
18433 / m_line_header->maximum_ops_per_instruction)
18434 * m_line_header->minimum_instruction_length);
18436 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18437 m_op_index = ((m_op_index + adjust)
18438 % m_line_header->maximum_ops_per_instruction);
18441 /* Ignore this record_line request. */
18444 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
18449 /* Return non-zero if we should add LINE to the line number table.
18450 LINE is the line to add, LAST_LINE is the last line that was added,
18451 LAST_SUBFILE is the subfile for LAST_LINE.
18452 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
18453 had a non-zero discriminator.
18455 We have to be careful in the presence of discriminators.
18456 E.g., for this line:
18458 for (i = 0; i < 100000; i++);
18460 clang can emit four line number entries for that one line,
18461 each with a different discriminator.
18462 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
18464 However, we want gdb to coalesce all four entries into one.
18465 Otherwise the user could stepi into the middle of the line and
18466 gdb would get confused about whether the pc really was in the
18467 middle of the line.
18469 Things are further complicated by the fact that two consecutive
18470 line number entries for the same line is a heuristic used by gcc
18471 to denote the end of the prologue. So we can't just discard duplicate
18472 entries, we have to be selective about it. The heuristic we use is
18473 that we only collapse consecutive entries for the same line if at least
18474 one of those entries has a non-zero discriminator. PR 17276.
18476 Note: Addresses in the line number state machine can never go backwards
18477 within one sequence, thus this coalescing is ok. */
18480 dwarf_record_line_p (unsigned int line, unsigned int last_line,
18481 int line_has_non_zero_discriminator,
18482 struct subfile *last_subfile)
18484 if (current_subfile != last_subfile)
18486 if (line != last_line)
18488 /* Same line for the same file that we've seen already.
18489 As a last check, for pr 17276, only record the line if the line
18490 has never had a non-zero discriminator. */
18491 if (!line_has_non_zero_discriminator)
18496 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
18497 in the line table of subfile SUBFILE. */
18500 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
18501 unsigned int line, CORE_ADDR address,
18502 record_line_ftype p_record_line)
18504 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
18506 if (dwarf_line_debug)
18508 fprintf_unfiltered (gdb_stdlog,
18509 "Recording line %u, file %s, address %s\n",
18510 line, lbasename (subfile->name),
18511 paddress (gdbarch, address));
18514 (*p_record_line) (subfile, line, addr);
18517 /* Subroutine of dwarf_decode_lines_1 to simplify it.
18518 Mark the end of a set of line number records.
18519 The arguments are the same as for dwarf_record_line_1.
18520 If SUBFILE is NULL the request is ignored. */
18523 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
18524 CORE_ADDR address, record_line_ftype p_record_line)
18526 if (subfile == NULL)
18529 if (dwarf_line_debug)
18531 fprintf_unfiltered (gdb_stdlog,
18532 "Finishing current line, file %s, address %s\n",
18533 lbasename (subfile->name),
18534 paddress (gdbarch, address));
18537 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
18541 lnp_state_machine::record_line (bool end_sequence)
18543 if (dwarf_line_debug)
18545 fprintf_unfiltered (gdb_stdlog,
18546 "Processing actual line %u: file %u,"
18547 " address %s, is_stmt %u, discrim %u\n",
18548 m_line, to_underlying (m_file),
18549 paddress (m_gdbarch, m_address),
18550 m_is_stmt, m_discriminator);
18553 file_entry *fe = current_file ();
18556 dwarf2_debug_line_missing_file_complaint ();
18557 /* For now we ignore lines not starting on an instruction boundary.
18558 But not when processing end_sequence for compatibility with the
18559 previous version of the code. */
18560 else if (m_op_index == 0 || end_sequence)
18562 fe->included_p = 1;
18563 if (m_record_lines_p && m_is_stmt)
18565 if (m_last_subfile != current_subfile || end_sequence)
18567 dwarf_finish_line (m_gdbarch, m_last_subfile,
18568 m_address, m_record_line_callback);
18573 if (dwarf_record_line_p (m_line, m_last_line,
18574 m_line_has_non_zero_discriminator,
18577 dwarf_record_line_1 (m_gdbarch, current_subfile,
18579 m_record_line_callback);
18581 m_last_subfile = current_subfile;
18582 m_last_line = m_line;
18588 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
18589 bool record_lines_p)
18592 m_record_lines_p = record_lines_p;
18593 m_line_header = lh;
18595 m_record_line_callback = ::record_line;
18597 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
18598 was a line entry for it so that the backend has a chance to adjust it
18599 and also record it in case it needs it. This is currently used by MIPS
18600 code, cf. `mips_adjust_dwarf2_line'. */
18601 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
18602 m_is_stmt = lh->default_is_stmt;
18603 m_discriminator = 0;
18607 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
18608 const gdb_byte *line_ptr,
18609 CORE_ADDR lowpc, CORE_ADDR address)
18611 /* If address < lowpc then it's not a usable value, it's outside the
18612 pc range of the CU. However, we restrict the test to only address
18613 values of zero to preserve GDB's previous behaviour which is to
18614 handle the specific case of a function being GC'd by the linker. */
18616 if (address == 0 && address < lowpc)
18618 /* This line table is for a function which has been
18619 GCd by the linker. Ignore it. PR gdb/12528 */
18621 struct objfile *objfile = cu->objfile;
18622 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
18624 complaint (&symfile_complaints,
18625 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
18626 line_offset, objfile_name (objfile));
18627 m_record_line_callback = noop_record_line;
18628 /* Note: record_line_callback is left as noop_record_line until
18629 we see DW_LNE_end_sequence. */
18633 /* Subroutine of dwarf_decode_lines to simplify it.
18634 Process the line number information in LH.
18635 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
18636 program in order to set included_p for every referenced header. */
18639 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
18640 const int decode_for_pst_p, CORE_ADDR lowpc)
18642 const gdb_byte *line_ptr, *extended_end;
18643 const gdb_byte *line_end;
18644 unsigned int bytes_read, extended_len;
18645 unsigned char op_code, extended_op;
18646 CORE_ADDR baseaddr;
18647 struct objfile *objfile = cu->objfile;
18648 bfd *abfd = objfile->obfd;
18649 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18650 /* True if we're recording line info (as opposed to building partial
18651 symtabs and just interested in finding include files mentioned by
18652 the line number program). */
18653 bool record_lines_p = !decode_for_pst_p;
18655 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18657 line_ptr = lh->statement_program_start;
18658 line_end = lh->statement_program_end;
18660 /* Read the statement sequences until there's nothing left. */
18661 while (line_ptr < line_end)
18663 /* The DWARF line number program state machine. Reset the state
18664 machine at the start of each sequence. */
18665 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
18666 bool end_sequence = false;
18668 if (record_lines_p)
18670 /* Start a subfile for the current file of the state
18672 const file_entry *fe = state_machine.current_file ();
18675 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
18678 /* Decode the table. */
18679 while (line_ptr < line_end && !end_sequence)
18681 op_code = read_1_byte (abfd, line_ptr);
18684 if (op_code >= lh->opcode_base)
18686 /* Special opcode. */
18687 state_machine.handle_special_opcode (op_code);
18689 else switch (op_code)
18691 case DW_LNS_extended_op:
18692 extended_len = read_unsigned_leb128 (abfd, line_ptr,
18694 line_ptr += bytes_read;
18695 extended_end = line_ptr + extended_len;
18696 extended_op = read_1_byte (abfd, line_ptr);
18698 switch (extended_op)
18700 case DW_LNE_end_sequence:
18701 state_machine.handle_end_sequence ();
18702 end_sequence = true;
18704 case DW_LNE_set_address:
18707 = read_address (abfd, line_ptr, cu, &bytes_read);
18708 line_ptr += bytes_read;
18710 state_machine.check_line_address (cu, line_ptr,
18712 state_machine.handle_set_address (baseaddr, address);
18715 case DW_LNE_define_file:
18717 const char *cur_file;
18718 unsigned int mod_time, length;
18721 cur_file = read_direct_string (abfd, line_ptr,
18723 line_ptr += bytes_read;
18724 dindex = (dir_index)
18725 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18726 line_ptr += bytes_read;
18728 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18729 line_ptr += bytes_read;
18731 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18732 line_ptr += bytes_read;
18733 lh->add_file_name (cur_file, dindex, mod_time, length);
18736 case DW_LNE_set_discriminator:
18738 /* The discriminator is not interesting to the
18739 debugger; just ignore it. We still need to
18740 check its value though:
18741 if there are consecutive entries for the same
18742 (non-prologue) line we want to coalesce them.
18745 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18746 line_ptr += bytes_read;
18748 state_machine.handle_set_discriminator (discr);
18752 complaint (&symfile_complaints,
18753 _("mangled .debug_line section"));
18756 /* Make sure that we parsed the extended op correctly. If e.g.
18757 we expected a different address size than the producer used,
18758 we may have read the wrong number of bytes. */
18759 if (line_ptr != extended_end)
18761 complaint (&symfile_complaints,
18762 _("mangled .debug_line section"));
18767 state_machine.handle_copy ();
18769 case DW_LNS_advance_pc:
18772 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18773 line_ptr += bytes_read;
18775 state_machine.handle_advance_pc (adjust);
18778 case DW_LNS_advance_line:
18781 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18782 line_ptr += bytes_read;
18784 state_machine.handle_advance_line (line_delta);
18787 case DW_LNS_set_file:
18789 file_name_index file
18790 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
18792 line_ptr += bytes_read;
18794 state_machine.handle_set_file (file);
18797 case DW_LNS_set_column:
18798 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18799 line_ptr += bytes_read;
18801 case DW_LNS_negate_stmt:
18802 state_machine.handle_negate_stmt ();
18804 case DW_LNS_set_basic_block:
18806 /* Add to the address register of the state machine the
18807 address increment value corresponding to special opcode
18808 255. I.e., this value is scaled by the minimum
18809 instruction length since special opcode 255 would have
18810 scaled the increment. */
18811 case DW_LNS_const_add_pc:
18812 state_machine.handle_const_add_pc ();
18814 case DW_LNS_fixed_advance_pc:
18816 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
18819 state_machine.handle_fixed_advance_pc (addr_adj);
18824 /* Unknown standard opcode, ignore it. */
18827 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18829 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18830 line_ptr += bytes_read;
18837 dwarf2_debug_line_missing_end_sequence_complaint ();
18839 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18840 in which case we still finish recording the last line). */
18841 state_machine.record_line (true);
18845 /* Decode the Line Number Program (LNP) for the given line_header
18846 structure and CU. The actual information extracted and the type
18847 of structures created from the LNP depends on the value of PST.
18849 1. If PST is NULL, then this procedure uses the data from the program
18850 to create all necessary symbol tables, and their linetables.
18852 2. If PST is not NULL, this procedure reads the program to determine
18853 the list of files included by the unit represented by PST, and
18854 builds all the associated partial symbol tables.
18856 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18857 It is used for relative paths in the line table.
18858 NOTE: When processing partial symtabs (pst != NULL),
18859 comp_dir == pst->dirname.
18861 NOTE: It is important that psymtabs have the same file name (via strcmp)
18862 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18863 symtab we don't use it in the name of the psymtabs we create.
18864 E.g. expand_line_sal requires this when finding psymtabs to expand.
18865 A good testcase for this is mb-inline.exp.
18867 LOWPC is the lowest address in CU (or 0 if not known).
18869 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18870 for its PC<->lines mapping information. Otherwise only the filename
18871 table is read in. */
18874 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18875 struct dwarf2_cu *cu, struct partial_symtab *pst,
18876 CORE_ADDR lowpc, int decode_mapping)
18878 struct objfile *objfile = cu->objfile;
18879 const int decode_for_pst_p = (pst != NULL);
18881 if (decode_mapping)
18882 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18884 if (decode_for_pst_p)
18888 /* Now that we're done scanning the Line Header Program, we can
18889 create the psymtab of each included file. */
18890 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
18891 if (lh->file_names[file_index].included_p == 1)
18893 const char *include_name =
18894 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18895 if (include_name != NULL)
18896 dwarf2_create_include_psymtab (include_name, pst, objfile);
18901 /* Make sure a symtab is created for every file, even files
18902 which contain only variables (i.e. no code with associated
18904 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18907 for (i = 0; i < lh->file_names.size (); i++)
18909 file_entry &fe = lh->file_names[i];
18911 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
18913 if (current_subfile->symtab == NULL)
18915 current_subfile->symtab
18916 = allocate_symtab (cust, current_subfile->name);
18918 fe.symtab = current_subfile->symtab;
18923 /* Start a subfile for DWARF. FILENAME is the name of the file and
18924 DIRNAME the name of the source directory which contains FILENAME
18925 or NULL if not known.
18926 This routine tries to keep line numbers from identical absolute and
18927 relative file names in a common subfile.
18929 Using the `list' example from the GDB testsuite, which resides in
18930 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18931 of /srcdir/list0.c yields the following debugging information for list0.c:
18933 DW_AT_name: /srcdir/list0.c
18934 DW_AT_comp_dir: /compdir
18935 files.files[0].name: list0.h
18936 files.files[0].dir: /srcdir
18937 files.files[1].name: list0.c
18938 files.files[1].dir: /srcdir
18940 The line number information for list0.c has to end up in a single
18941 subfile, so that `break /srcdir/list0.c:1' works as expected.
18942 start_subfile will ensure that this happens provided that we pass the
18943 concatenation of files.files[1].dir and files.files[1].name as the
18947 dwarf2_start_subfile (const char *filename, const char *dirname)
18951 /* In order not to lose the line information directory,
18952 we concatenate it to the filename when it makes sense.
18953 Note that the Dwarf3 standard says (speaking of filenames in line
18954 information): ``The directory index is ignored for file names
18955 that represent full path names''. Thus ignoring dirname in the
18956 `else' branch below isn't an issue. */
18958 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18960 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18964 start_subfile (filename);
18970 /* Start a symtab for DWARF.
18971 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18973 static struct compunit_symtab *
18974 dwarf2_start_symtab (struct dwarf2_cu *cu,
18975 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18977 struct compunit_symtab *cust
18978 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18980 record_debugformat ("DWARF 2");
18981 record_producer (cu->producer);
18983 /* We assume that we're processing GCC output. */
18984 processing_gcc_compilation = 2;
18986 cu->processing_has_namespace_info = 0;
18992 var_decode_location (struct attribute *attr, struct symbol *sym,
18993 struct dwarf2_cu *cu)
18995 struct objfile *objfile = cu->objfile;
18996 struct comp_unit_head *cu_header = &cu->header;
18998 /* NOTE drow/2003-01-30: There used to be a comment and some special
18999 code here to turn a symbol with DW_AT_external and a
19000 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
19001 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
19002 with some versions of binutils) where shared libraries could have
19003 relocations against symbols in their debug information - the
19004 minimal symbol would have the right address, but the debug info
19005 would not. It's no longer necessary, because we will explicitly
19006 apply relocations when we read in the debug information now. */
19008 /* A DW_AT_location attribute with no contents indicates that a
19009 variable has been optimized away. */
19010 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
19012 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19016 /* Handle one degenerate form of location expression specially, to
19017 preserve GDB's previous behavior when section offsets are
19018 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
19019 then mark this symbol as LOC_STATIC. */
19021 if (attr_form_is_block (attr)
19022 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
19023 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
19024 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
19025 && (DW_BLOCK (attr)->size
19026 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
19028 unsigned int dummy;
19030 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
19031 SYMBOL_VALUE_ADDRESS (sym) =
19032 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
19034 SYMBOL_VALUE_ADDRESS (sym) =
19035 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
19036 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
19037 fixup_symbol_section (sym, objfile);
19038 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
19039 SYMBOL_SECTION (sym));
19043 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
19044 expression evaluator, and use LOC_COMPUTED only when necessary
19045 (i.e. when the value of a register or memory location is
19046 referenced, or a thread-local block, etc.). Then again, it might
19047 not be worthwhile. I'm assuming that it isn't unless performance
19048 or memory numbers show me otherwise. */
19050 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
19052 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
19053 cu->has_loclist = 1;
19056 /* Given a pointer to a DWARF information entry, figure out if we need
19057 to make a symbol table entry for it, and if so, create a new entry
19058 and return a pointer to it.
19059 If TYPE is NULL, determine symbol type from the die, otherwise
19060 used the passed type.
19061 If SPACE is not NULL, use it to hold the new symbol. If it is
19062 NULL, allocate a new symbol on the objfile's obstack. */
19064 static struct symbol *
19065 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
19066 struct symbol *space)
19068 struct objfile *objfile = cu->objfile;
19069 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19070 struct symbol *sym = NULL;
19072 struct attribute *attr = NULL;
19073 struct attribute *attr2 = NULL;
19074 CORE_ADDR baseaddr;
19075 struct pending **list_to_add = NULL;
19077 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
19079 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19081 name = dwarf2_name (die, cu);
19084 const char *linkagename;
19085 int suppress_add = 0;
19090 sym = allocate_symbol (objfile);
19091 OBJSTAT (objfile, n_syms++);
19093 /* Cache this symbol's name and the name's demangled form (if any). */
19094 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
19095 linkagename = dwarf2_physname (name, die, cu);
19096 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
19098 /* Fortran does not have mangling standard and the mangling does differ
19099 between gfortran, iFort etc. */
19100 if (cu->language == language_fortran
19101 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19102 symbol_set_demangled_name (&(sym->ginfo),
19103 dwarf2_full_name (name, die, cu),
19106 /* Default assumptions.
19107 Use the passed type or decode it from the die. */
19108 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19109 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19111 SYMBOL_TYPE (sym) = type;
19113 SYMBOL_TYPE (sym) = die_type (die, cu);
19114 attr = dwarf2_attr (die,
19115 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19119 SYMBOL_LINE (sym) = DW_UNSND (attr);
19122 attr = dwarf2_attr (die,
19123 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19127 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19128 struct file_entry *fe;
19130 if (cu->line_header != NULL)
19131 fe = cu->line_header->file_name_at (file_index);
19136 complaint (&symfile_complaints,
19137 _("file index out of range"));
19139 symbol_set_symtab (sym, fe->symtab);
19145 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
19150 addr = attr_value_as_address (attr);
19151 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
19152 SYMBOL_VALUE_ADDRESS (sym) = addr;
19154 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
19155 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
19156 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
19157 add_symbol_to_list (sym, cu->list_in_scope);
19159 case DW_TAG_subprogram:
19160 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19162 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19163 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19164 if ((attr2 && (DW_UNSND (attr2) != 0))
19165 || cu->language == language_ada)
19167 /* Subprograms marked external are stored as a global symbol.
19168 Ada subprograms, whether marked external or not, are always
19169 stored as a global symbol, because we want to be able to
19170 access them globally. For instance, we want to be able
19171 to break on a nested subprogram without having to
19172 specify the context. */
19173 list_to_add = &global_symbols;
19177 list_to_add = cu->list_in_scope;
19180 case DW_TAG_inlined_subroutine:
19181 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19183 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19184 SYMBOL_INLINED (sym) = 1;
19185 list_to_add = cu->list_in_scope;
19187 case DW_TAG_template_value_param:
19189 /* Fall through. */
19190 case DW_TAG_constant:
19191 case DW_TAG_variable:
19192 case DW_TAG_member:
19193 /* Compilation with minimal debug info may result in
19194 variables with missing type entries. Change the
19195 misleading `void' type to something sensible. */
19196 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19197 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
19199 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19200 /* In the case of DW_TAG_member, we should only be called for
19201 static const members. */
19202 if (die->tag == DW_TAG_member)
19204 /* dwarf2_add_field uses die_is_declaration,
19205 so we do the same. */
19206 gdb_assert (die_is_declaration (die, cu));
19211 dwarf2_const_value (attr, sym, cu);
19212 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19215 if (attr2 && (DW_UNSND (attr2) != 0))
19216 list_to_add = &global_symbols;
19218 list_to_add = cu->list_in_scope;
19222 attr = dwarf2_attr (die, DW_AT_location, cu);
19225 var_decode_location (attr, sym, cu);
19226 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19228 /* Fortran explicitly imports any global symbols to the local
19229 scope by DW_TAG_common_block. */
19230 if (cu->language == language_fortran && die->parent
19231 && die->parent->tag == DW_TAG_common_block)
19234 if (SYMBOL_CLASS (sym) == LOC_STATIC
19235 && SYMBOL_VALUE_ADDRESS (sym) == 0
19236 && !dwarf2_per_objfile->has_section_at_zero)
19238 /* When a static variable is eliminated by the linker,
19239 the corresponding debug information is not stripped
19240 out, but the variable address is set to null;
19241 do not add such variables into symbol table. */
19243 else if (attr2 && (DW_UNSND (attr2) != 0))
19245 /* Workaround gfortran PR debug/40040 - it uses
19246 DW_AT_location for variables in -fPIC libraries which may
19247 get overriden by other libraries/executable and get
19248 a different address. Resolve it by the minimal symbol
19249 which may come from inferior's executable using copy
19250 relocation. Make this workaround only for gfortran as for
19251 other compilers GDB cannot guess the minimal symbol
19252 Fortran mangling kind. */
19253 if (cu->language == language_fortran && die->parent
19254 && die->parent->tag == DW_TAG_module
19256 && startswith (cu->producer, "GNU Fortran"))
19257 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19259 /* A variable with DW_AT_external is never static,
19260 but it may be block-scoped. */
19261 list_to_add = (cu->list_in_scope == &file_symbols
19262 ? &global_symbols : cu->list_in_scope);
19265 list_to_add = cu->list_in_scope;
19269 /* We do not know the address of this symbol.
19270 If it is an external symbol and we have type information
19271 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19272 The address of the variable will then be determined from
19273 the minimal symbol table whenever the variable is
19275 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19277 /* Fortran explicitly imports any global symbols to the local
19278 scope by DW_TAG_common_block. */
19279 if (cu->language == language_fortran && die->parent
19280 && die->parent->tag == DW_TAG_common_block)
19282 /* SYMBOL_CLASS doesn't matter here because
19283 read_common_block is going to reset it. */
19285 list_to_add = cu->list_in_scope;
19287 else if (attr2 && (DW_UNSND (attr2) != 0)
19288 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19290 /* A variable with DW_AT_external is never static, but it
19291 may be block-scoped. */
19292 list_to_add = (cu->list_in_scope == &file_symbols
19293 ? &global_symbols : cu->list_in_scope);
19295 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19297 else if (!die_is_declaration (die, cu))
19299 /* Use the default LOC_OPTIMIZED_OUT class. */
19300 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19302 list_to_add = cu->list_in_scope;
19306 case DW_TAG_formal_parameter:
19307 /* If we are inside a function, mark this as an argument. If
19308 not, we might be looking at an argument to an inlined function
19309 when we do not have enough information to show inlined frames;
19310 pretend it's a local variable in that case so that the user can
19312 if (context_stack_depth > 0
19313 && context_stack[context_stack_depth - 1].name != NULL)
19314 SYMBOL_IS_ARGUMENT (sym) = 1;
19315 attr = dwarf2_attr (die, DW_AT_location, cu);
19318 var_decode_location (attr, sym, cu);
19320 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19323 dwarf2_const_value (attr, sym, cu);
19326 list_to_add = cu->list_in_scope;
19328 case DW_TAG_unspecified_parameters:
19329 /* From varargs functions; gdb doesn't seem to have any
19330 interest in this information, so just ignore it for now.
19333 case DW_TAG_template_type_param:
19335 /* Fall through. */
19336 case DW_TAG_class_type:
19337 case DW_TAG_interface_type:
19338 case DW_TAG_structure_type:
19339 case DW_TAG_union_type:
19340 case DW_TAG_set_type:
19341 case DW_TAG_enumeration_type:
19342 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19343 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19346 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19347 really ever be static objects: otherwise, if you try
19348 to, say, break of a class's method and you're in a file
19349 which doesn't mention that class, it won't work unless
19350 the check for all static symbols in lookup_symbol_aux
19351 saves you. See the OtherFileClass tests in
19352 gdb.c++/namespace.exp. */
19356 list_to_add = (cu->list_in_scope == &file_symbols
19357 && cu->language == language_cplus
19358 ? &global_symbols : cu->list_in_scope);
19360 /* The semantics of C++ state that "struct foo {
19361 ... }" also defines a typedef for "foo". */
19362 if (cu->language == language_cplus
19363 || cu->language == language_ada
19364 || cu->language == language_d
19365 || cu->language == language_rust)
19367 /* The symbol's name is already allocated along
19368 with this objfile, so we don't need to
19369 duplicate it for the type. */
19370 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19371 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19376 case DW_TAG_typedef:
19377 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19378 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19379 list_to_add = cu->list_in_scope;
19381 case DW_TAG_base_type:
19382 case DW_TAG_subrange_type:
19383 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19384 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19385 list_to_add = cu->list_in_scope;
19387 case DW_TAG_enumerator:
19388 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19391 dwarf2_const_value (attr, sym, cu);
19394 /* NOTE: carlton/2003-11-10: See comment above in the
19395 DW_TAG_class_type, etc. block. */
19397 list_to_add = (cu->list_in_scope == &file_symbols
19398 && cu->language == language_cplus
19399 ? &global_symbols : cu->list_in_scope);
19402 case DW_TAG_imported_declaration:
19403 case DW_TAG_namespace:
19404 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19405 list_to_add = &global_symbols;
19407 case DW_TAG_module:
19408 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19409 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
19410 list_to_add = &global_symbols;
19412 case DW_TAG_common_block:
19413 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
19414 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
19415 add_symbol_to_list (sym, cu->list_in_scope);
19418 /* Not a tag we recognize. Hopefully we aren't processing
19419 trash data, but since we must specifically ignore things
19420 we don't recognize, there is nothing else we should do at
19422 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
19423 dwarf_tag_name (die->tag));
19429 sym->hash_next = objfile->template_symbols;
19430 objfile->template_symbols = sym;
19431 list_to_add = NULL;
19434 if (list_to_add != NULL)
19435 add_symbol_to_list (sym, list_to_add);
19437 /* For the benefit of old versions of GCC, check for anonymous
19438 namespaces based on the demangled name. */
19439 if (!cu->processing_has_namespace_info
19440 && cu->language == language_cplus)
19441 cp_scan_for_anonymous_namespaces (sym, objfile);
19446 /* A wrapper for new_symbol_full that always allocates a new symbol. */
19448 static struct symbol *
19449 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19451 return new_symbol_full (die, type, cu, NULL);
19454 /* Given an attr with a DW_FORM_dataN value in host byte order,
19455 zero-extend it as appropriate for the symbol's type. The DWARF
19456 standard (v4) is not entirely clear about the meaning of using
19457 DW_FORM_dataN for a constant with a signed type, where the type is
19458 wider than the data. The conclusion of a discussion on the DWARF
19459 list was that this is unspecified. We choose to always zero-extend
19460 because that is the interpretation long in use by GCC. */
19463 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
19464 struct dwarf2_cu *cu, LONGEST *value, int bits)
19466 struct objfile *objfile = cu->objfile;
19467 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
19468 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
19469 LONGEST l = DW_UNSND (attr);
19471 if (bits < sizeof (*value) * 8)
19473 l &= ((LONGEST) 1 << bits) - 1;
19476 else if (bits == sizeof (*value) * 8)
19480 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
19481 store_unsigned_integer (bytes, bits / 8, byte_order, l);
19488 /* Read a constant value from an attribute. Either set *VALUE, or if
19489 the value does not fit in *VALUE, set *BYTES - either already
19490 allocated on the objfile obstack, or newly allocated on OBSTACK,
19491 or, set *BATON, if we translated the constant to a location
19495 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
19496 const char *name, struct obstack *obstack,
19497 struct dwarf2_cu *cu,
19498 LONGEST *value, const gdb_byte **bytes,
19499 struct dwarf2_locexpr_baton **baton)
19501 struct objfile *objfile = cu->objfile;
19502 struct comp_unit_head *cu_header = &cu->header;
19503 struct dwarf_block *blk;
19504 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
19505 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19511 switch (attr->form)
19514 case DW_FORM_GNU_addr_index:
19518 if (TYPE_LENGTH (type) != cu_header->addr_size)
19519 dwarf2_const_value_length_mismatch_complaint (name,
19520 cu_header->addr_size,
19521 TYPE_LENGTH (type));
19522 /* Symbols of this form are reasonably rare, so we just
19523 piggyback on the existing location code rather than writing
19524 a new implementation of symbol_computed_ops. */
19525 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
19526 (*baton)->per_cu = cu->per_cu;
19527 gdb_assert ((*baton)->per_cu);
19529 (*baton)->size = 2 + cu_header->addr_size;
19530 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
19531 (*baton)->data = data;
19533 data[0] = DW_OP_addr;
19534 store_unsigned_integer (&data[1], cu_header->addr_size,
19535 byte_order, DW_ADDR (attr));
19536 data[cu_header->addr_size + 1] = DW_OP_stack_value;
19539 case DW_FORM_string:
19541 case DW_FORM_GNU_str_index:
19542 case DW_FORM_GNU_strp_alt:
19543 /* DW_STRING is already allocated on the objfile obstack, point
19545 *bytes = (const gdb_byte *) DW_STRING (attr);
19547 case DW_FORM_block1:
19548 case DW_FORM_block2:
19549 case DW_FORM_block4:
19550 case DW_FORM_block:
19551 case DW_FORM_exprloc:
19552 case DW_FORM_data16:
19553 blk = DW_BLOCK (attr);
19554 if (TYPE_LENGTH (type) != blk->size)
19555 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
19556 TYPE_LENGTH (type));
19557 *bytes = blk->data;
19560 /* The DW_AT_const_value attributes are supposed to carry the
19561 symbol's value "represented as it would be on the target
19562 architecture." By the time we get here, it's already been
19563 converted to host endianness, so we just need to sign- or
19564 zero-extend it as appropriate. */
19565 case DW_FORM_data1:
19566 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
19568 case DW_FORM_data2:
19569 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
19571 case DW_FORM_data4:
19572 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
19574 case DW_FORM_data8:
19575 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
19578 case DW_FORM_sdata:
19579 case DW_FORM_implicit_const:
19580 *value = DW_SND (attr);
19583 case DW_FORM_udata:
19584 *value = DW_UNSND (attr);
19588 complaint (&symfile_complaints,
19589 _("unsupported const value attribute form: '%s'"),
19590 dwarf_form_name (attr->form));
19597 /* Copy constant value from an attribute to a symbol. */
19600 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
19601 struct dwarf2_cu *cu)
19603 struct objfile *objfile = cu->objfile;
19605 const gdb_byte *bytes;
19606 struct dwarf2_locexpr_baton *baton;
19608 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
19609 SYMBOL_PRINT_NAME (sym),
19610 &objfile->objfile_obstack, cu,
19611 &value, &bytes, &baton);
19615 SYMBOL_LOCATION_BATON (sym) = baton;
19616 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
19618 else if (bytes != NULL)
19620 SYMBOL_VALUE_BYTES (sym) = bytes;
19621 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
19625 SYMBOL_VALUE (sym) = value;
19626 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
19630 /* Return the type of the die in question using its DW_AT_type attribute. */
19632 static struct type *
19633 die_type (struct die_info *die, struct dwarf2_cu *cu)
19635 struct attribute *type_attr;
19637 type_attr = dwarf2_attr (die, DW_AT_type, cu);
19640 /* A missing DW_AT_type represents a void type. */
19641 return objfile_type (cu->objfile)->builtin_void;
19644 return lookup_die_type (die, type_attr, cu);
19647 /* True iff CU's producer generates GNAT Ada auxiliary information
19648 that allows to find parallel types through that information instead
19649 of having to do expensive parallel lookups by type name. */
19652 need_gnat_info (struct dwarf2_cu *cu)
19654 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
19655 of GNAT produces this auxiliary information, without any indication
19656 that it is produced. Part of enhancing the FSF version of GNAT
19657 to produce that information will be to put in place an indicator
19658 that we can use in order to determine whether the descriptive type
19659 info is available or not. One suggestion that has been made is
19660 to use a new attribute, attached to the CU die. For now, assume
19661 that the descriptive type info is not available. */
19665 /* Return the auxiliary type of the die in question using its
19666 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
19667 attribute is not present. */
19669 static struct type *
19670 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
19672 struct attribute *type_attr;
19674 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
19678 return lookup_die_type (die, type_attr, cu);
19681 /* If DIE has a descriptive_type attribute, then set the TYPE's
19682 descriptive type accordingly. */
19685 set_descriptive_type (struct type *type, struct die_info *die,
19686 struct dwarf2_cu *cu)
19688 struct type *descriptive_type = die_descriptive_type (die, cu);
19690 if (descriptive_type)
19692 ALLOCATE_GNAT_AUX_TYPE (type);
19693 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
19697 /* Return the containing type of the die in question using its
19698 DW_AT_containing_type attribute. */
19700 static struct type *
19701 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
19703 struct attribute *type_attr;
19705 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
19707 error (_("Dwarf Error: Problem turning containing type into gdb type "
19708 "[in module %s]"), objfile_name (cu->objfile));
19710 return lookup_die_type (die, type_attr, cu);
19713 /* Return an error marker type to use for the ill formed type in DIE/CU. */
19715 static struct type *
19716 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
19718 struct objfile *objfile = dwarf2_per_objfile->objfile;
19719 char *message, *saved;
19721 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
19722 objfile_name (objfile),
19723 to_underlying (cu->header.sect_off),
19724 to_underlying (die->sect_off));
19725 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
19726 message, strlen (message));
19729 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19732 /* Look up the type of DIE in CU using its type attribute ATTR.
19733 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19734 DW_AT_containing_type.
19735 If there is no type substitute an error marker. */
19737 static struct type *
19738 lookup_die_type (struct die_info *die, const struct attribute *attr,
19739 struct dwarf2_cu *cu)
19741 struct objfile *objfile = cu->objfile;
19742 struct type *this_type;
19744 gdb_assert (attr->name == DW_AT_type
19745 || attr->name == DW_AT_GNAT_descriptive_type
19746 || attr->name == DW_AT_containing_type);
19748 /* First see if we have it cached. */
19750 if (attr->form == DW_FORM_GNU_ref_alt)
19752 struct dwarf2_per_cu_data *per_cu;
19753 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19755 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
19756 this_type = get_die_type_at_offset (sect_off, per_cu);
19758 else if (attr_form_is_ref (attr))
19760 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19762 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
19764 else if (attr->form == DW_FORM_ref_sig8)
19766 ULONGEST signature = DW_SIGNATURE (attr);
19768 return get_signatured_type (die, signature, cu);
19772 complaint (&symfile_complaints,
19773 _("Dwarf Error: Bad type attribute %s in DIE"
19774 " at 0x%x [in module %s]"),
19775 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
19776 objfile_name (objfile));
19777 return build_error_marker_type (cu, die);
19780 /* If not cached we need to read it in. */
19782 if (this_type == NULL)
19784 struct die_info *type_die = NULL;
19785 struct dwarf2_cu *type_cu = cu;
19787 if (attr_form_is_ref (attr))
19788 type_die = follow_die_ref (die, attr, &type_cu);
19789 if (type_die == NULL)
19790 return build_error_marker_type (cu, die);
19791 /* If we find the type now, it's probably because the type came
19792 from an inter-CU reference and the type's CU got expanded before
19794 this_type = read_type_die (type_die, type_cu);
19797 /* If we still don't have a type use an error marker. */
19799 if (this_type == NULL)
19800 return build_error_marker_type (cu, die);
19805 /* Return the type in DIE, CU.
19806 Returns NULL for invalid types.
19808 This first does a lookup in die_type_hash,
19809 and only reads the die in if necessary.
19811 NOTE: This can be called when reading in partial or full symbols. */
19813 static struct type *
19814 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19816 struct type *this_type;
19818 this_type = get_die_type (die, cu);
19822 return read_type_die_1 (die, cu);
19825 /* Read the type in DIE, CU.
19826 Returns NULL for invalid types. */
19828 static struct type *
19829 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19831 struct type *this_type = NULL;
19835 case DW_TAG_class_type:
19836 case DW_TAG_interface_type:
19837 case DW_TAG_structure_type:
19838 case DW_TAG_union_type:
19839 this_type = read_structure_type (die, cu);
19841 case DW_TAG_enumeration_type:
19842 this_type = read_enumeration_type (die, cu);
19844 case DW_TAG_subprogram:
19845 case DW_TAG_subroutine_type:
19846 case DW_TAG_inlined_subroutine:
19847 this_type = read_subroutine_type (die, cu);
19849 case DW_TAG_array_type:
19850 this_type = read_array_type (die, cu);
19852 case DW_TAG_set_type:
19853 this_type = read_set_type (die, cu);
19855 case DW_TAG_pointer_type:
19856 this_type = read_tag_pointer_type (die, cu);
19858 case DW_TAG_ptr_to_member_type:
19859 this_type = read_tag_ptr_to_member_type (die, cu);
19861 case DW_TAG_reference_type:
19862 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
19864 case DW_TAG_rvalue_reference_type:
19865 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
19867 case DW_TAG_const_type:
19868 this_type = read_tag_const_type (die, cu);
19870 case DW_TAG_volatile_type:
19871 this_type = read_tag_volatile_type (die, cu);
19873 case DW_TAG_restrict_type:
19874 this_type = read_tag_restrict_type (die, cu);
19876 case DW_TAG_string_type:
19877 this_type = read_tag_string_type (die, cu);
19879 case DW_TAG_typedef:
19880 this_type = read_typedef (die, cu);
19882 case DW_TAG_subrange_type:
19883 this_type = read_subrange_type (die, cu);
19885 case DW_TAG_base_type:
19886 this_type = read_base_type (die, cu);
19888 case DW_TAG_unspecified_type:
19889 this_type = read_unspecified_type (die, cu);
19891 case DW_TAG_namespace:
19892 this_type = read_namespace_type (die, cu);
19894 case DW_TAG_module:
19895 this_type = read_module_type (die, cu);
19897 case DW_TAG_atomic_type:
19898 this_type = read_tag_atomic_type (die, cu);
19901 complaint (&symfile_complaints,
19902 _("unexpected tag in read_type_die: '%s'"),
19903 dwarf_tag_name (die->tag));
19910 /* See if we can figure out if the class lives in a namespace. We do
19911 this by looking for a member function; its demangled name will
19912 contain namespace info, if there is any.
19913 Return the computed name or NULL.
19914 Space for the result is allocated on the objfile's obstack.
19915 This is the full-die version of guess_partial_die_structure_name.
19916 In this case we know DIE has no useful parent. */
19919 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19921 struct die_info *spec_die;
19922 struct dwarf2_cu *spec_cu;
19923 struct die_info *child;
19926 spec_die = die_specification (die, &spec_cu);
19927 if (spec_die != NULL)
19933 for (child = die->child;
19935 child = child->sibling)
19937 if (child->tag == DW_TAG_subprogram)
19939 const char *linkage_name = dw2_linkage_name (child, cu);
19941 if (linkage_name != NULL)
19944 = language_class_name_from_physname (cu->language_defn,
19948 if (actual_name != NULL)
19950 const char *die_name = dwarf2_name (die, cu);
19952 if (die_name != NULL
19953 && strcmp (die_name, actual_name) != 0)
19955 /* Strip off the class name from the full name.
19956 We want the prefix. */
19957 int die_name_len = strlen (die_name);
19958 int actual_name_len = strlen (actual_name);
19960 /* Test for '::' as a sanity check. */
19961 if (actual_name_len > die_name_len + 2
19962 && actual_name[actual_name_len
19963 - die_name_len - 1] == ':')
19964 name = (char *) obstack_copy0 (
19965 &cu->objfile->per_bfd->storage_obstack,
19966 actual_name, actual_name_len - die_name_len - 2);
19969 xfree (actual_name);
19978 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19979 prefix part in such case. See
19980 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19982 static const char *
19983 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19985 struct attribute *attr;
19988 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19989 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
19992 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
19995 attr = dw2_linkage_name_attr (die, cu);
19996 if (attr == NULL || DW_STRING (attr) == NULL)
19999 /* dwarf2_name had to be already called. */
20000 gdb_assert (DW_STRING_IS_CANONICAL (attr));
20002 /* Strip the base name, keep any leading namespaces/classes. */
20003 base = strrchr (DW_STRING (attr), ':');
20004 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
20007 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20009 &base[-1] - DW_STRING (attr));
20012 /* Return the name of the namespace/class that DIE is defined within,
20013 or "" if we can't tell. The caller should not xfree the result.
20015 For example, if we're within the method foo() in the following
20025 then determine_prefix on foo's die will return "N::C". */
20027 static const char *
20028 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
20030 struct die_info *parent, *spec_die;
20031 struct dwarf2_cu *spec_cu;
20032 struct type *parent_type;
20033 const char *retval;
20035 if (cu->language != language_cplus
20036 && cu->language != language_fortran && cu->language != language_d
20037 && cu->language != language_rust)
20040 retval = anonymous_struct_prefix (die, cu);
20044 /* We have to be careful in the presence of DW_AT_specification.
20045 For example, with GCC 3.4, given the code
20049 // Definition of N::foo.
20053 then we'll have a tree of DIEs like this:
20055 1: DW_TAG_compile_unit
20056 2: DW_TAG_namespace // N
20057 3: DW_TAG_subprogram // declaration of N::foo
20058 4: DW_TAG_subprogram // definition of N::foo
20059 DW_AT_specification // refers to die #3
20061 Thus, when processing die #4, we have to pretend that we're in
20062 the context of its DW_AT_specification, namely the contex of die
20065 spec_die = die_specification (die, &spec_cu);
20066 if (spec_die == NULL)
20067 parent = die->parent;
20070 parent = spec_die->parent;
20074 if (parent == NULL)
20076 else if (parent->building_fullname)
20079 const char *parent_name;
20081 /* It has been seen on RealView 2.2 built binaries,
20082 DW_TAG_template_type_param types actually _defined_ as
20083 children of the parent class:
20086 template class <class Enum> Class{};
20087 Class<enum E> class_e;
20089 1: DW_TAG_class_type (Class)
20090 2: DW_TAG_enumeration_type (E)
20091 3: DW_TAG_enumerator (enum1:0)
20092 3: DW_TAG_enumerator (enum2:1)
20094 2: DW_TAG_template_type_param
20095 DW_AT_type DW_FORM_ref_udata (E)
20097 Besides being broken debug info, it can put GDB into an
20098 infinite loop. Consider:
20100 When we're building the full name for Class<E>, we'll start
20101 at Class, and go look over its template type parameters,
20102 finding E. We'll then try to build the full name of E, and
20103 reach here. We're now trying to build the full name of E,
20104 and look over the parent DIE for containing scope. In the
20105 broken case, if we followed the parent DIE of E, we'd again
20106 find Class, and once again go look at its template type
20107 arguments, etc., etc. Simply don't consider such parent die
20108 as source-level parent of this die (it can't be, the language
20109 doesn't allow it), and break the loop here. */
20110 name = dwarf2_name (die, cu);
20111 parent_name = dwarf2_name (parent, cu);
20112 complaint (&symfile_complaints,
20113 _("template param type '%s' defined within parent '%s'"),
20114 name ? name : "<unknown>",
20115 parent_name ? parent_name : "<unknown>");
20119 switch (parent->tag)
20121 case DW_TAG_namespace:
20122 parent_type = read_type_die (parent, cu);
20123 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20124 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20125 Work around this problem here. */
20126 if (cu->language == language_cplus
20127 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
20129 /* We give a name to even anonymous namespaces. */
20130 return TYPE_TAG_NAME (parent_type);
20131 case DW_TAG_class_type:
20132 case DW_TAG_interface_type:
20133 case DW_TAG_structure_type:
20134 case DW_TAG_union_type:
20135 case DW_TAG_module:
20136 parent_type = read_type_die (parent, cu);
20137 if (TYPE_TAG_NAME (parent_type) != NULL)
20138 return TYPE_TAG_NAME (parent_type);
20140 /* An anonymous structure is only allowed non-static data
20141 members; no typedefs, no member functions, et cetera.
20142 So it does not need a prefix. */
20144 case DW_TAG_compile_unit:
20145 case DW_TAG_partial_unit:
20146 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
20147 if (cu->language == language_cplus
20148 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
20149 && die->child != NULL
20150 && (die->tag == DW_TAG_class_type
20151 || die->tag == DW_TAG_structure_type
20152 || die->tag == DW_TAG_union_type))
20154 char *name = guess_full_die_structure_name (die, cu);
20159 case DW_TAG_enumeration_type:
20160 parent_type = read_type_die (parent, cu);
20161 if (TYPE_DECLARED_CLASS (parent_type))
20163 if (TYPE_TAG_NAME (parent_type) != NULL)
20164 return TYPE_TAG_NAME (parent_type);
20167 /* Fall through. */
20169 return determine_prefix (parent, cu);
20173 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20174 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20175 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20176 an obconcat, otherwise allocate storage for the result. The CU argument is
20177 used to determine the language and hence, the appropriate separator. */
20179 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20182 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20183 int physname, struct dwarf2_cu *cu)
20185 const char *lead = "";
20188 if (suffix == NULL || suffix[0] == '\0'
20189 || prefix == NULL || prefix[0] == '\0')
20191 else if (cu->language == language_d)
20193 /* For D, the 'main' function could be defined in any module, but it
20194 should never be prefixed. */
20195 if (strcmp (suffix, "D main") == 0)
20203 else if (cu->language == language_fortran && physname)
20205 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20206 DW_AT_MIPS_linkage_name is preferred and used instead. */
20214 if (prefix == NULL)
20216 if (suffix == NULL)
20223 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20225 strcpy (retval, lead);
20226 strcat (retval, prefix);
20227 strcat (retval, sep);
20228 strcat (retval, suffix);
20233 /* We have an obstack. */
20234 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20238 /* Return sibling of die, NULL if no sibling. */
20240 static struct die_info *
20241 sibling_die (struct die_info *die)
20243 return die->sibling;
20246 /* Get name of a die, return NULL if not found. */
20248 static const char *
20249 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20250 struct obstack *obstack)
20252 if (name && cu->language == language_cplus)
20254 std::string canon_name = cp_canonicalize_string (name);
20256 if (!canon_name.empty ())
20258 if (canon_name != name)
20259 name = (const char *) obstack_copy0 (obstack,
20260 canon_name.c_str (),
20261 canon_name.length ());
20268 /* Get name of a die, return NULL if not found.
20269 Anonymous namespaces are converted to their magic string. */
20271 static const char *
20272 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20274 struct attribute *attr;
20276 attr = dwarf2_attr (die, DW_AT_name, cu);
20277 if ((!attr || !DW_STRING (attr))
20278 && die->tag != DW_TAG_namespace
20279 && die->tag != DW_TAG_class_type
20280 && die->tag != DW_TAG_interface_type
20281 && die->tag != DW_TAG_structure_type
20282 && die->tag != DW_TAG_union_type)
20287 case DW_TAG_compile_unit:
20288 case DW_TAG_partial_unit:
20289 /* Compilation units have a DW_AT_name that is a filename, not
20290 a source language identifier. */
20291 case DW_TAG_enumeration_type:
20292 case DW_TAG_enumerator:
20293 /* These tags always have simple identifiers already; no need
20294 to canonicalize them. */
20295 return DW_STRING (attr);
20297 case DW_TAG_namespace:
20298 if (attr != NULL && DW_STRING (attr) != NULL)
20299 return DW_STRING (attr);
20300 return CP_ANONYMOUS_NAMESPACE_STR;
20302 case DW_TAG_class_type:
20303 case DW_TAG_interface_type:
20304 case DW_TAG_structure_type:
20305 case DW_TAG_union_type:
20306 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20307 structures or unions. These were of the form "._%d" in GCC 4.1,
20308 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20309 and GCC 4.4. We work around this problem by ignoring these. */
20310 if (attr && DW_STRING (attr)
20311 && (startswith (DW_STRING (attr), "._")
20312 || startswith (DW_STRING (attr), "<anonymous")))
20315 /* GCC might emit a nameless typedef that has a linkage name. See
20316 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20317 if (!attr || DW_STRING (attr) == NULL)
20319 char *demangled = NULL;
20321 attr = dw2_linkage_name_attr (die, cu);
20322 if (attr == NULL || DW_STRING (attr) == NULL)
20325 /* Avoid demangling DW_STRING (attr) the second time on a second
20326 call for the same DIE. */
20327 if (!DW_STRING_IS_CANONICAL (attr))
20328 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20334 /* FIXME: we already did this for the partial symbol... */
20337 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20338 demangled, strlen (demangled)));
20339 DW_STRING_IS_CANONICAL (attr) = 1;
20342 /* Strip any leading namespaces/classes, keep only the base name.
20343 DW_AT_name for named DIEs does not contain the prefixes. */
20344 base = strrchr (DW_STRING (attr), ':');
20345 if (base && base > DW_STRING (attr) && base[-1] == ':')
20348 return DW_STRING (attr);
20357 if (!DW_STRING_IS_CANONICAL (attr))
20360 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20361 &cu->objfile->per_bfd->storage_obstack);
20362 DW_STRING_IS_CANONICAL (attr) = 1;
20364 return DW_STRING (attr);
20367 /* Return the die that this die in an extension of, or NULL if there
20368 is none. *EXT_CU is the CU containing DIE on input, and the CU
20369 containing the return value on output. */
20371 static struct die_info *
20372 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20374 struct attribute *attr;
20376 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20380 return follow_die_ref (die, attr, ext_cu);
20383 /* Convert a DIE tag into its string name. */
20385 static const char *
20386 dwarf_tag_name (unsigned tag)
20388 const char *name = get_DW_TAG_name (tag);
20391 return "DW_TAG_<unknown>";
20396 /* Convert a DWARF attribute code into its string name. */
20398 static const char *
20399 dwarf_attr_name (unsigned attr)
20403 #ifdef MIPS /* collides with DW_AT_HP_block_index */
20404 if (attr == DW_AT_MIPS_fde)
20405 return "DW_AT_MIPS_fde";
20407 if (attr == DW_AT_HP_block_index)
20408 return "DW_AT_HP_block_index";
20411 name = get_DW_AT_name (attr);
20414 return "DW_AT_<unknown>";
20419 /* Convert a DWARF value form code into its string name. */
20421 static const char *
20422 dwarf_form_name (unsigned form)
20424 const char *name = get_DW_FORM_name (form);
20427 return "DW_FORM_<unknown>";
20432 static const char *
20433 dwarf_bool_name (unsigned mybool)
20441 /* Convert a DWARF type code into its string name. */
20443 static const char *
20444 dwarf_type_encoding_name (unsigned enc)
20446 const char *name = get_DW_ATE_name (enc);
20449 return "DW_ATE_<unknown>";
20455 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
20459 print_spaces (indent, f);
20460 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
20461 dwarf_tag_name (die->tag), die->abbrev,
20462 to_underlying (die->sect_off));
20464 if (die->parent != NULL)
20466 print_spaces (indent, f);
20467 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
20468 to_underlying (die->parent->sect_off));
20471 print_spaces (indent, f);
20472 fprintf_unfiltered (f, " has children: %s\n",
20473 dwarf_bool_name (die->child != NULL));
20475 print_spaces (indent, f);
20476 fprintf_unfiltered (f, " attributes:\n");
20478 for (i = 0; i < die->num_attrs; ++i)
20480 print_spaces (indent, f);
20481 fprintf_unfiltered (f, " %s (%s) ",
20482 dwarf_attr_name (die->attrs[i].name),
20483 dwarf_form_name (die->attrs[i].form));
20485 switch (die->attrs[i].form)
20488 case DW_FORM_GNU_addr_index:
20489 fprintf_unfiltered (f, "address: ");
20490 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
20492 case DW_FORM_block2:
20493 case DW_FORM_block4:
20494 case DW_FORM_block:
20495 case DW_FORM_block1:
20496 fprintf_unfiltered (f, "block: size %s",
20497 pulongest (DW_BLOCK (&die->attrs[i])->size));
20499 case DW_FORM_exprloc:
20500 fprintf_unfiltered (f, "expression: size %s",
20501 pulongest (DW_BLOCK (&die->attrs[i])->size));
20503 case DW_FORM_data16:
20504 fprintf_unfiltered (f, "constant of 16 bytes");
20506 case DW_FORM_ref_addr:
20507 fprintf_unfiltered (f, "ref address: ");
20508 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20510 case DW_FORM_GNU_ref_alt:
20511 fprintf_unfiltered (f, "alt ref address: ");
20512 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20518 case DW_FORM_ref_udata:
20519 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
20520 (long) (DW_UNSND (&die->attrs[i])));
20522 case DW_FORM_data1:
20523 case DW_FORM_data2:
20524 case DW_FORM_data4:
20525 case DW_FORM_data8:
20526 case DW_FORM_udata:
20527 case DW_FORM_sdata:
20528 fprintf_unfiltered (f, "constant: %s",
20529 pulongest (DW_UNSND (&die->attrs[i])));
20531 case DW_FORM_sec_offset:
20532 fprintf_unfiltered (f, "section offset: %s",
20533 pulongest (DW_UNSND (&die->attrs[i])));
20535 case DW_FORM_ref_sig8:
20536 fprintf_unfiltered (f, "signature: %s",
20537 hex_string (DW_SIGNATURE (&die->attrs[i])));
20539 case DW_FORM_string:
20541 case DW_FORM_line_strp:
20542 case DW_FORM_GNU_str_index:
20543 case DW_FORM_GNU_strp_alt:
20544 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
20545 DW_STRING (&die->attrs[i])
20546 ? DW_STRING (&die->attrs[i]) : "",
20547 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
20550 if (DW_UNSND (&die->attrs[i]))
20551 fprintf_unfiltered (f, "flag: TRUE");
20553 fprintf_unfiltered (f, "flag: FALSE");
20555 case DW_FORM_flag_present:
20556 fprintf_unfiltered (f, "flag: TRUE");
20558 case DW_FORM_indirect:
20559 /* The reader will have reduced the indirect form to
20560 the "base form" so this form should not occur. */
20561 fprintf_unfiltered (f,
20562 "unexpected attribute form: DW_FORM_indirect");
20564 case DW_FORM_implicit_const:
20565 fprintf_unfiltered (f, "constant: %s",
20566 plongest (DW_SND (&die->attrs[i])));
20569 fprintf_unfiltered (f, "unsupported attribute form: %d.",
20570 die->attrs[i].form);
20573 fprintf_unfiltered (f, "\n");
20578 dump_die_for_error (struct die_info *die)
20580 dump_die_shallow (gdb_stderr, 0, die);
20584 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
20586 int indent = level * 4;
20588 gdb_assert (die != NULL);
20590 if (level >= max_level)
20593 dump_die_shallow (f, indent, die);
20595 if (die->child != NULL)
20597 print_spaces (indent, f);
20598 fprintf_unfiltered (f, " Children:");
20599 if (level + 1 < max_level)
20601 fprintf_unfiltered (f, "\n");
20602 dump_die_1 (f, level + 1, max_level, die->child);
20606 fprintf_unfiltered (f,
20607 " [not printed, max nesting level reached]\n");
20611 if (die->sibling != NULL && level > 0)
20613 dump_die_1 (f, level, max_level, die->sibling);
20617 /* This is called from the pdie macro in gdbinit.in.
20618 It's not static so gcc will keep a copy callable from gdb. */
20621 dump_die (struct die_info *die, int max_level)
20623 dump_die_1 (gdb_stdlog, 0, max_level, die);
20627 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
20631 slot = htab_find_slot_with_hash (cu->die_hash, die,
20632 to_underlying (die->sect_off),
20638 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
20642 dwarf2_get_ref_die_offset (const struct attribute *attr)
20644 if (attr_form_is_ref (attr))
20645 return (sect_offset) DW_UNSND (attr);
20647 complaint (&symfile_complaints,
20648 _("unsupported die ref attribute form: '%s'"),
20649 dwarf_form_name (attr->form));
20653 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
20654 * the value held by the attribute is not constant. */
20657 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
20659 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
20660 return DW_SND (attr);
20661 else if (attr->form == DW_FORM_udata
20662 || attr->form == DW_FORM_data1
20663 || attr->form == DW_FORM_data2
20664 || attr->form == DW_FORM_data4
20665 || attr->form == DW_FORM_data8)
20666 return DW_UNSND (attr);
20669 /* For DW_FORM_data16 see attr_form_is_constant. */
20670 complaint (&symfile_complaints,
20671 _("Attribute value is not a constant (%s)"),
20672 dwarf_form_name (attr->form));
20673 return default_value;
20677 /* Follow reference or signature attribute ATTR of SRC_DIE.
20678 On entry *REF_CU is the CU of SRC_DIE.
20679 On exit *REF_CU is the CU of the result. */
20681 static struct die_info *
20682 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
20683 struct dwarf2_cu **ref_cu)
20685 struct die_info *die;
20687 if (attr_form_is_ref (attr))
20688 die = follow_die_ref (src_die, attr, ref_cu);
20689 else if (attr->form == DW_FORM_ref_sig8)
20690 die = follow_die_sig (src_die, attr, ref_cu);
20693 dump_die_for_error (src_die);
20694 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
20695 objfile_name ((*ref_cu)->objfile));
20701 /* Follow reference OFFSET.
20702 On entry *REF_CU is the CU of the source die referencing OFFSET.
20703 On exit *REF_CU is the CU of the result.
20704 Returns NULL if OFFSET is invalid. */
20706 static struct die_info *
20707 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
20708 struct dwarf2_cu **ref_cu)
20710 struct die_info temp_die;
20711 struct dwarf2_cu *target_cu, *cu = *ref_cu;
20713 gdb_assert (cu->per_cu != NULL);
20717 if (cu->per_cu->is_debug_types)
20719 /* .debug_types CUs cannot reference anything outside their CU.
20720 If they need to, they have to reference a signatured type via
20721 DW_FORM_ref_sig8. */
20722 if (!offset_in_cu_p (&cu->header, sect_off))
20725 else if (offset_in_dwz != cu->per_cu->is_dwz
20726 || !offset_in_cu_p (&cu->header, sect_off))
20728 struct dwarf2_per_cu_data *per_cu;
20730 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
20733 /* If necessary, add it to the queue and load its DIEs. */
20734 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20735 load_full_comp_unit (per_cu, cu->language);
20737 target_cu = per_cu->cu;
20739 else if (cu->dies == NULL)
20741 /* We're loading full DIEs during partial symbol reading. */
20742 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20743 load_full_comp_unit (cu->per_cu, language_minimal);
20746 *ref_cu = target_cu;
20747 temp_die.sect_off = sect_off;
20748 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20750 to_underlying (sect_off));
20753 /* Follow reference attribute ATTR of SRC_DIE.
20754 On entry *REF_CU is the CU of SRC_DIE.
20755 On exit *REF_CU is the CU of the result. */
20757 static struct die_info *
20758 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20759 struct dwarf2_cu **ref_cu)
20761 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20762 struct dwarf2_cu *cu = *ref_cu;
20763 struct die_info *die;
20765 die = follow_die_offset (sect_off,
20766 (attr->form == DW_FORM_GNU_ref_alt
20767 || cu->per_cu->is_dwz),
20770 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20771 "at 0x%x [in module %s]"),
20772 to_underlying (sect_off), to_underlying (src_die->sect_off),
20773 objfile_name (cu->objfile));
20778 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
20779 Returned value is intended for DW_OP_call*. Returned
20780 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20782 struct dwarf2_locexpr_baton
20783 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
20784 struct dwarf2_per_cu_data *per_cu,
20785 CORE_ADDR (*get_frame_pc) (void *baton),
20788 struct dwarf2_cu *cu;
20789 struct die_info *die;
20790 struct attribute *attr;
20791 struct dwarf2_locexpr_baton retval;
20793 dw2_setup (per_cu->objfile);
20795 if (per_cu->cu == NULL)
20800 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20801 Instead just throw an error, not much else we can do. */
20802 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20803 to_underlying (sect_off), objfile_name (per_cu->objfile));
20806 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20808 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20809 to_underlying (sect_off), objfile_name (per_cu->objfile));
20811 attr = dwarf2_attr (die, DW_AT_location, cu);
20814 /* DWARF: "If there is no such attribute, then there is no effect.".
20815 DATA is ignored if SIZE is 0. */
20817 retval.data = NULL;
20820 else if (attr_form_is_section_offset (attr))
20822 struct dwarf2_loclist_baton loclist_baton;
20823 CORE_ADDR pc = (*get_frame_pc) (baton);
20826 fill_in_loclist_baton (cu, &loclist_baton, attr);
20828 retval.data = dwarf2_find_location_expression (&loclist_baton,
20830 retval.size = size;
20834 if (!attr_form_is_block (attr))
20835 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20836 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20837 to_underlying (sect_off), objfile_name (per_cu->objfile));
20839 retval.data = DW_BLOCK (attr)->data;
20840 retval.size = DW_BLOCK (attr)->size;
20842 retval.per_cu = cu->per_cu;
20844 age_cached_comp_units ();
20849 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20852 struct dwarf2_locexpr_baton
20853 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20854 struct dwarf2_per_cu_data *per_cu,
20855 CORE_ADDR (*get_frame_pc) (void *baton),
20858 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
20860 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
20863 /* Write a constant of a given type as target-ordered bytes into
20866 static const gdb_byte *
20867 write_constant_as_bytes (struct obstack *obstack,
20868 enum bfd_endian byte_order,
20875 *len = TYPE_LENGTH (type);
20876 result = (gdb_byte *) obstack_alloc (obstack, *len);
20877 store_unsigned_integer (result, *len, byte_order, value);
20882 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20883 pointer to the constant bytes and set LEN to the length of the
20884 data. If memory is needed, allocate it on OBSTACK. If the DIE
20885 does not have a DW_AT_const_value, return NULL. */
20888 dwarf2_fetch_constant_bytes (sect_offset sect_off,
20889 struct dwarf2_per_cu_data *per_cu,
20890 struct obstack *obstack,
20893 struct dwarf2_cu *cu;
20894 struct die_info *die;
20895 struct attribute *attr;
20896 const gdb_byte *result = NULL;
20899 enum bfd_endian byte_order;
20901 dw2_setup (per_cu->objfile);
20903 if (per_cu->cu == NULL)
20908 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20909 Instead just throw an error, not much else we can do. */
20910 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20911 to_underlying (sect_off), objfile_name (per_cu->objfile));
20914 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20916 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20917 to_underlying (sect_off), objfile_name (per_cu->objfile));
20920 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20924 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20925 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20927 switch (attr->form)
20930 case DW_FORM_GNU_addr_index:
20934 *len = cu->header.addr_size;
20935 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20936 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20940 case DW_FORM_string:
20942 case DW_FORM_GNU_str_index:
20943 case DW_FORM_GNU_strp_alt:
20944 /* DW_STRING is already allocated on the objfile obstack, point
20946 result = (const gdb_byte *) DW_STRING (attr);
20947 *len = strlen (DW_STRING (attr));
20949 case DW_FORM_block1:
20950 case DW_FORM_block2:
20951 case DW_FORM_block4:
20952 case DW_FORM_block:
20953 case DW_FORM_exprloc:
20954 case DW_FORM_data16:
20955 result = DW_BLOCK (attr)->data;
20956 *len = DW_BLOCK (attr)->size;
20959 /* The DW_AT_const_value attributes are supposed to carry the
20960 symbol's value "represented as it would be on the target
20961 architecture." By the time we get here, it's already been
20962 converted to host endianness, so we just need to sign- or
20963 zero-extend it as appropriate. */
20964 case DW_FORM_data1:
20965 type = die_type (die, cu);
20966 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20967 if (result == NULL)
20968 result = write_constant_as_bytes (obstack, byte_order,
20971 case DW_FORM_data2:
20972 type = die_type (die, cu);
20973 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20974 if (result == NULL)
20975 result = write_constant_as_bytes (obstack, byte_order,
20978 case DW_FORM_data4:
20979 type = die_type (die, cu);
20980 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20981 if (result == NULL)
20982 result = write_constant_as_bytes (obstack, byte_order,
20985 case DW_FORM_data8:
20986 type = die_type (die, cu);
20987 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20988 if (result == NULL)
20989 result = write_constant_as_bytes (obstack, byte_order,
20993 case DW_FORM_sdata:
20994 case DW_FORM_implicit_const:
20995 type = die_type (die, cu);
20996 result = write_constant_as_bytes (obstack, byte_order,
20997 type, DW_SND (attr), len);
21000 case DW_FORM_udata:
21001 type = die_type (die, cu);
21002 result = write_constant_as_bytes (obstack, byte_order,
21003 type, DW_UNSND (attr), len);
21007 complaint (&symfile_complaints,
21008 _("unsupported const value attribute form: '%s'"),
21009 dwarf_form_name (attr->form));
21016 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
21017 valid type for this die is found. */
21020 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
21021 struct dwarf2_per_cu_data *per_cu)
21023 struct dwarf2_cu *cu;
21024 struct die_info *die;
21026 dw2_setup (per_cu->objfile);
21028 if (per_cu->cu == NULL)
21034 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21038 return die_type (die, cu);
21041 /* Return the type of the DIE at DIE_OFFSET in the CU named by
21045 dwarf2_get_die_type (cu_offset die_offset,
21046 struct dwarf2_per_cu_data *per_cu)
21048 dw2_setup (per_cu->objfile);
21050 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
21051 return get_die_type_at_offset (die_offset_sect, per_cu);
21054 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
21055 On entry *REF_CU is the CU of SRC_DIE.
21056 On exit *REF_CU is the CU of the result.
21057 Returns NULL if the referenced DIE isn't found. */
21059 static struct die_info *
21060 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
21061 struct dwarf2_cu **ref_cu)
21063 struct die_info temp_die;
21064 struct dwarf2_cu *sig_cu;
21065 struct die_info *die;
21067 /* While it might be nice to assert sig_type->type == NULL here,
21068 we can get here for DW_AT_imported_declaration where we need
21069 the DIE not the type. */
21071 /* If necessary, add it to the queue and load its DIEs. */
21073 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
21074 read_signatured_type (sig_type);
21076 sig_cu = sig_type->per_cu.cu;
21077 gdb_assert (sig_cu != NULL);
21078 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
21079 temp_die.sect_off = sig_type->type_offset_in_section;
21080 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
21081 to_underlying (temp_die.sect_off));
21084 /* For .gdb_index version 7 keep track of included TUs.
21085 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
21086 if (dwarf2_per_objfile->index_table != NULL
21087 && dwarf2_per_objfile->index_table->version <= 7)
21089 VEC_safe_push (dwarf2_per_cu_ptr,
21090 (*ref_cu)->per_cu->imported_symtabs,
21101 /* Follow signatured type referenced by ATTR in SRC_DIE.
21102 On entry *REF_CU is the CU of SRC_DIE.
21103 On exit *REF_CU is the CU of the result.
21104 The result is the DIE of the type.
21105 If the referenced type cannot be found an error is thrown. */
21107 static struct die_info *
21108 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21109 struct dwarf2_cu **ref_cu)
21111 ULONGEST signature = DW_SIGNATURE (attr);
21112 struct signatured_type *sig_type;
21113 struct die_info *die;
21115 gdb_assert (attr->form == DW_FORM_ref_sig8);
21117 sig_type = lookup_signatured_type (*ref_cu, signature);
21118 /* sig_type will be NULL if the signatured type is missing from
21120 if (sig_type == NULL)
21122 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21123 " from DIE at 0x%x [in module %s]"),
21124 hex_string (signature), to_underlying (src_die->sect_off),
21125 objfile_name ((*ref_cu)->objfile));
21128 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
21131 dump_die_for_error (src_die);
21132 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
21133 " from DIE at 0x%x [in module %s]"),
21134 hex_string (signature), to_underlying (src_die->sect_off),
21135 objfile_name ((*ref_cu)->objfile));
21141 /* Get the type specified by SIGNATURE referenced in DIE/CU,
21142 reading in and processing the type unit if necessary. */
21144 static struct type *
21145 get_signatured_type (struct die_info *die, ULONGEST signature,
21146 struct dwarf2_cu *cu)
21148 struct signatured_type *sig_type;
21149 struct dwarf2_cu *type_cu;
21150 struct die_info *type_die;
21153 sig_type = lookup_signatured_type (cu, signature);
21154 /* sig_type will be NULL if the signatured type is missing from
21156 if (sig_type == NULL)
21158 complaint (&symfile_complaints,
21159 _("Dwarf Error: Cannot find signatured DIE %s referenced"
21160 " from DIE at 0x%x [in module %s]"),
21161 hex_string (signature), to_underlying (die->sect_off),
21162 objfile_name (dwarf2_per_objfile->objfile));
21163 return build_error_marker_type (cu, die);
21166 /* If we already know the type we're done. */
21167 if (sig_type->type != NULL)
21168 return sig_type->type;
21171 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21172 if (type_die != NULL)
21174 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21175 is created. This is important, for example, because for c++ classes
21176 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21177 type = read_type_die (type_die, type_cu);
21180 complaint (&symfile_complaints,
21181 _("Dwarf Error: Cannot build signatured type %s"
21182 " referenced from DIE at 0x%x [in module %s]"),
21183 hex_string (signature), to_underlying (die->sect_off),
21184 objfile_name (dwarf2_per_objfile->objfile));
21185 type = build_error_marker_type (cu, die);
21190 complaint (&symfile_complaints,
21191 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21192 " from DIE at 0x%x [in module %s]"),
21193 hex_string (signature), to_underlying (die->sect_off),
21194 objfile_name (dwarf2_per_objfile->objfile));
21195 type = build_error_marker_type (cu, die);
21197 sig_type->type = type;
21202 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21203 reading in and processing the type unit if necessary. */
21205 static struct type *
21206 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21207 struct dwarf2_cu *cu) /* ARI: editCase function */
21209 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21210 if (attr_form_is_ref (attr))
21212 struct dwarf2_cu *type_cu = cu;
21213 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21215 return read_type_die (type_die, type_cu);
21217 else if (attr->form == DW_FORM_ref_sig8)
21219 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21223 complaint (&symfile_complaints,
21224 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21225 " at 0x%x [in module %s]"),
21226 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21227 objfile_name (dwarf2_per_objfile->objfile));
21228 return build_error_marker_type (cu, die);
21232 /* Load the DIEs associated with type unit PER_CU into memory. */
21235 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21237 struct signatured_type *sig_type;
21239 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21240 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21242 /* We have the per_cu, but we need the signatured_type.
21243 Fortunately this is an easy translation. */
21244 gdb_assert (per_cu->is_debug_types);
21245 sig_type = (struct signatured_type *) per_cu;
21247 gdb_assert (per_cu->cu == NULL);
21249 read_signatured_type (sig_type);
21251 gdb_assert (per_cu->cu != NULL);
21254 /* die_reader_func for read_signatured_type.
21255 This is identical to load_full_comp_unit_reader,
21256 but is kept separate for now. */
21259 read_signatured_type_reader (const struct die_reader_specs *reader,
21260 const gdb_byte *info_ptr,
21261 struct die_info *comp_unit_die,
21265 struct dwarf2_cu *cu = reader->cu;
21267 gdb_assert (cu->die_hash == NULL);
21269 htab_create_alloc_ex (cu->header.length / 12,
21273 &cu->comp_unit_obstack,
21274 hashtab_obstack_allocate,
21275 dummy_obstack_deallocate);
21278 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21279 &info_ptr, comp_unit_die);
21280 cu->dies = comp_unit_die;
21281 /* comp_unit_die is not stored in die_hash, no need. */
21283 /* We try not to read any attributes in this function, because not
21284 all CUs needed for references have been loaded yet, and symbol
21285 table processing isn't initialized. But we have to set the CU language,
21286 or we won't be able to build types correctly.
21287 Similarly, if we do not read the producer, we can not apply
21288 producer-specific interpretation. */
21289 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21292 /* Read in a signatured type and build its CU and DIEs.
21293 If the type is a stub for the real type in a DWO file,
21294 read in the real type from the DWO file as well. */
21297 read_signatured_type (struct signatured_type *sig_type)
21299 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21301 gdb_assert (per_cu->is_debug_types);
21302 gdb_assert (per_cu->cu == NULL);
21304 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21305 read_signatured_type_reader, NULL);
21306 sig_type->per_cu.tu_read = 1;
21309 /* Decode simple location descriptions.
21310 Given a pointer to a dwarf block that defines a location, compute
21311 the location and return the value.
21313 NOTE drow/2003-11-18: This function is called in two situations
21314 now: for the address of static or global variables (partial symbols
21315 only) and for offsets into structures which are expected to be
21316 (more or less) constant. The partial symbol case should go away,
21317 and only the constant case should remain. That will let this
21318 function complain more accurately. A few special modes are allowed
21319 without complaint for global variables (for instance, global
21320 register values and thread-local values).
21322 A location description containing no operations indicates that the
21323 object is optimized out. The return value is 0 for that case.
21324 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21325 callers will only want a very basic result and this can become a
21328 Note that stack[0] is unused except as a default error return. */
21331 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21333 struct objfile *objfile = cu->objfile;
21335 size_t size = blk->size;
21336 const gdb_byte *data = blk->data;
21337 CORE_ADDR stack[64];
21339 unsigned int bytes_read, unsnd;
21345 stack[++stacki] = 0;
21384 stack[++stacki] = op - DW_OP_lit0;
21419 stack[++stacki] = op - DW_OP_reg0;
21421 dwarf2_complex_location_expr_complaint ();
21425 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
21427 stack[++stacki] = unsnd;
21429 dwarf2_complex_location_expr_complaint ();
21433 stack[++stacki] = read_address (objfile->obfd, &data[i],
21438 case DW_OP_const1u:
21439 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
21443 case DW_OP_const1s:
21444 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
21448 case DW_OP_const2u:
21449 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
21453 case DW_OP_const2s:
21454 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
21458 case DW_OP_const4u:
21459 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
21463 case DW_OP_const4s:
21464 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
21468 case DW_OP_const8u:
21469 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
21474 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
21480 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
21485 stack[stacki + 1] = stack[stacki];
21490 stack[stacki - 1] += stack[stacki];
21494 case DW_OP_plus_uconst:
21495 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
21501 stack[stacki - 1] -= stack[stacki];
21506 /* If we're not the last op, then we definitely can't encode
21507 this using GDB's address_class enum. This is valid for partial
21508 global symbols, although the variable's address will be bogus
21511 dwarf2_complex_location_expr_complaint ();
21514 case DW_OP_GNU_push_tls_address:
21515 case DW_OP_form_tls_address:
21516 /* The top of the stack has the offset from the beginning
21517 of the thread control block at which the variable is located. */
21518 /* Nothing should follow this operator, so the top of stack would
21520 /* This is valid for partial global symbols, but the variable's
21521 address will be bogus in the psymtab. Make it always at least
21522 non-zero to not look as a variable garbage collected by linker
21523 which have DW_OP_addr 0. */
21525 dwarf2_complex_location_expr_complaint ();
21529 case DW_OP_GNU_uninit:
21532 case DW_OP_GNU_addr_index:
21533 case DW_OP_GNU_const_index:
21534 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
21541 const char *name = get_DW_OP_name (op);
21544 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
21547 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
21551 return (stack[stacki]);
21554 /* Enforce maximum stack depth of SIZE-1 to avoid writing
21555 outside of the allocated space. Also enforce minimum>0. */
21556 if (stacki >= ARRAY_SIZE (stack) - 1)
21558 complaint (&symfile_complaints,
21559 _("location description stack overflow"));
21565 complaint (&symfile_complaints,
21566 _("location description stack underflow"));
21570 return (stack[stacki]);
21573 /* memory allocation interface */
21575 static struct dwarf_block *
21576 dwarf_alloc_block (struct dwarf2_cu *cu)
21578 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
21581 static struct die_info *
21582 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
21584 struct die_info *die;
21585 size_t size = sizeof (struct die_info);
21588 size += (num_attrs - 1) * sizeof (struct attribute);
21590 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
21591 memset (die, 0, sizeof (struct die_info));
21596 /* Macro support. */
21598 /* Return file name relative to the compilation directory of file number I in
21599 *LH's file name table. The result is allocated using xmalloc; the caller is
21600 responsible for freeing it. */
21603 file_file_name (int file, struct line_header *lh)
21605 /* Is the file number a valid index into the line header's file name
21606 table? Remember that file numbers start with one, not zero. */
21607 if (1 <= file && file <= lh->file_names.size ())
21609 const file_entry &fe = lh->file_names[file - 1];
21611 if (!IS_ABSOLUTE_PATH (fe.name))
21613 const char *dir = fe.include_dir (lh);
21615 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
21617 return xstrdup (fe.name);
21621 /* The compiler produced a bogus file number. We can at least
21622 record the macro definitions made in the file, even if we
21623 won't be able to find the file by name. */
21624 char fake_name[80];
21626 xsnprintf (fake_name, sizeof (fake_name),
21627 "<bad macro file number %d>", file);
21629 complaint (&symfile_complaints,
21630 _("bad file number in macro information (%d)"),
21633 return xstrdup (fake_name);
21637 /* Return the full name of file number I in *LH's file name table.
21638 Use COMP_DIR as the name of the current directory of the
21639 compilation. The result is allocated using xmalloc; the caller is
21640 responsible for freeing it. */
21642 file_full_name (int file, struct line_header *lh, const char *comp_dir)
21644 /* Is the file number a valid index into the line header's file name
21645 table? Remember that file numbers start with one, not zero. */
21646 if (1 <= file && file <= lh->file_names.size ())
21648 char *relative = file_file_name (file, lh);
21650 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
21652 return reconcat (relative, comp_dir, SLASH_STRING,
21653 relative, (char *) NULL);
21656 return file_file_name (file, lh);
21660 static struct macro_source_file *
21661 macro_start_file (int file, int line,
21662 struct macro_source_file *current_file,
21663 struct line_header *lh)
21665 /* File name relative to the compilation directory of this source file. */
21666 char *file_name = file_file_name (file, lh);
21668 if (! current_file)
21670 /* Note: We don't create a macro table for this compilation unit
21671 at all until we actually get a filename. */
21672 struct macro_table *macro_table = get_macro_table ();
21674 /* If we have no current file, then this must be the start_file
21675 directive for the compilation unit's main source file. */
21676 current_file = macro_set_main (macro_table, file_name);
21677 macro_define_special (macro_table);
21680 current_file = macro_include (current_file, line, file_name);
21684 return current_file;
21687 static const char *
21688 consume_improper_spaces (const char *p, const char *body)
21692 complaint (&symfile_complaints,
21693 _("macro definition contains spaces "
21694 "in formal argument list:\n`%s'"),
21706 parse_macro_definition (struct macro_source_file *file, int line,
21711 /* The body string takes one of two forms. For object-like macro
21712 definitions, it should be:
21714 <macro name> " " <definition>
21716 For function-like macro definitions, it should be:
21718 <macro name> "() " <definition>
21720 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
21722 Spaces may appear only where explicitly indicated, and in the
21725 The Dwarf 2 spec says that an object-like macro's name is always
21726 followed by a space, but versions of GCC around March 2002 omit
21727 the space when the macro's definition is the empty string.
21729 The Dwarf 2 spec says that there should be no spaces between the
21730 formal arguments in a function-like macro's formal argument list,
21731 but versions of GCC around March 2002 include spaces after the
21735 /* Find the extent of the macro name. The macro name is terminated
21736 by either a space or null character (for an object-like macro) or
21737 an opening paren (for a function-like macro). */
21738 for (p = body; *p; p++)
21739 if (*p == ' ' || *p == '(')
21742 if (*p == ' ' || *p == '\0')
21744 /* It's an object-like macro. */
21745 int name_len = p - body;
21746 char *name = savestring (body, name_len);
21747 const char *replacement;
21750 replacement = body + name_len + 1;
21753 dwarf2_macro_malformed_definition_complaint (body);
21754 replacement = body + name_len;
21757 macro_define_object (file, line, name, replacement);
21761 else if (*p == '(')
21763 /* It's a function-like macro. */
21764 char *name = savestring (body, p - body);
21767 char **argv = XNEWVEC (char *, argv_size);
21771 p = consume_improper_spaces (p, body);
21773 /* Parse the formal argument list. */
21774 while (*p && *p != ')')
21776 /* Find the extent of the current argument name. */
21777 const char *arg_start = p;
21779 while (*p && *p != ',' && *p != ')' && *p != ' ')
21782 if (! *p || p == arg_start)
21783 dwarf2_macro_malformed_definition_complaint (body);
21786 /* Make sure argv has room for the new argument. */
21787 if (argc >= argv_size)
21790 argv = XRESIZEVEC (char *, argv, argv_size);
21793 argv[argc++] = savestring (arg_start, p - arg_start);
21796 p = consume_improper_spaces (p, body);
21798 /* Consume the comma, if present. */
21803 p = consume_improper_spaces (p, body);
21812 /* Perfectly formed definition, no complaints. */
21813 macro_define_function (file, line, name,
21814 argc, (const char **) argv,
21816 else if (*p == '\0')
21818 /* Complain, but do define it. */
21819 dwarf2_macro_malformed_definition_complaint (body);
21820 macro_define_function (file, line, name,
21821 argc, (const char **) argv,
21825 /* Just complain. */
21826 dwarf2_macro_malformed_definition_complaint (body);
21829 /* Just complain. */
21830 dwarf2_macro_malformed_definition_complaint (body);
21836 for (i = 0; i < argc; i++)
21842 dwarf2_macro_malformed_definition_complaint (body);
21845 /* Skip some bytes from BYTES according to the form given in FORM.
21846 Returns the new pointer. */
21848 static const gdb_byte *
21849 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21850 enum dwarf_form form,
21851 unsigned int offset_size,
21852 struct dwarf2_section_info *section)
21854 unsigned int bytes_read;
21858 case DW_FORM_data1:
21863 case DW_FORM_data2:
21867 case DW_FORM_data4:
21871 case DW_FORM_data8:
21875 case DW_FORM_data16:
21879 case DW_FORM_string:
21880 read_direct_string (abfd, bytes, &bytes_read);
21881 bytes += bytes_read;
21884 case DW_FORM_sec_offset:
21886 case DW_FORM_GNU_strp_alt:
21887 bytes += offset_size;
21890 case DW_FORM_block:
21891 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21892 bytes += bytes_read;
21895 case DW_FORM_block1:
21896 bytes += 1 + read_1_byte (abfd, bytes);
21898 case DW_FORM_block2:
21899 bytes += 2 + read_2_bytes (abfd, bytes);
21901 case DW_FORM_block4:
21902 bytes += 4 + read_4_bytes (abfd, bytes);
21905 case DW_FORM_sdata:
21906 case DW_FORM_udata:
21907 case DW_FORM_GNU_addr_index:
21908 case DW_FORM_GNU_str_index:
21909 bytes = gdb_skip_leb128 (bytes, buffer_end);
21912 dwarf2_section_buffer_overflow_complaint (section);
21917 case DW_FORM_implicit_const:
21923 complaint (&symfile_complaints,
21924 _("invalid form 0x%x in `%s'"),
21925 form, get_section_name (section));
21933 /* A helper for dwarf_decode_macros that handles skipping an unknown
21934 opcode. Returns an updated pointer to the macro data buffer; or,
21935 on error, issues a complaint and returns NULL. */
21937 static const gdb_byte *
21938 skip_unknown_opcode (unsigned int opcode,
21939 const gdb_byte **opcode_definitions,
21940 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21942 unsigned int offset_size,
21943 struct dwarf2_section_info *section)
21945 unsigned int bytes_read, i;
21947 const gdb_byte *defn;
21949 if (opcode_definitions[opcode] == NULL)
21951 complaint (&symfile_complaints,
21952 _("unrecognized DW_MACFINO opcode 0x%x"),
21957 defn = opcode_definitions[opcode];
21958 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21959 defn += bytes_read;
21961 for (i = 0; i < arg; ++i)
21963 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21964 (enum dwarf_form) defn[i], offset_size,
21966 if (mac_ptr == NULL)
21968 /* skip_form_bytes already issued the complaint. */
21976 /* A helper function which parses the header of a macro section.
21977 If the macro section is the extended (for now called "GNU") type,
21978 then this updates *OFFSET_SIZE. Returns a pointer to just after
21979 the header, or issues a complaint and returns NULL on error. */
21981 static const gdb_byte *
21982 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
21984 const gdb_byte *mac_ptr,
21985 unsigned int *offset_size,
21986 int section_is_gnu)
21988 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
21990 if (section_is_gnu)
21992 unsigned int version, flags;
21994 version = read_2_bytes (abfd, mac_ptr);
21995 if (version != 4 && version != 5)
21997 complaint (&symfile_complaints,
21998 _("unrecognized version `%d' in .debug_macro section"),
22004 flags = read_1_byte (abfd, mac_ptr);
22006 *offset_size = (flags & 1) ? 8 : 4;
22008 if ((flags & 2) != 0)
22009 /* We don't need the line table offset. */
22010 mac_ptr += *offset_size;
22012 /* Vendor opcode descriptions. */
22013 if ((flags & 4) != 0)
22015 unsigned int i, count;
22017 count = read_1_byte (abfd, mac_ptr);
22019 for (i = 0; i < count; ++i)
22021 unsigned int opcode, bytes_read;
22024 opcode = read_1_byte (abfd, mac_ptr);
22026 opcode_definitions[opcode] = mac_ptr;
22027 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22028 mac_ptr += bytes_read;
22037 /* A helper for dwarf_decode_macros that handles the GNU extensions,
22038 including DW_MACRO_import. */
22041 dwarf_decode_macro_bytes (bfd *abfd,
22042 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22043 struct macro_source_file *current_file,
22044 struct line_header *lh,
22045 struct dwarf2_section_info *section,
22046 int section_is_gnu, int section_is_dwz,
22047 unsigned int offset_size,
22048 htab_t include_hash)
22050 struct objfile *objfile = dwarf2_per_objfile->objfile;
22051 enum dwarf_macro_record_type macinfo_type;
22052 int at_commandline;
22053 const gdb_byte *opcode_definitions[256];
22055 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22056 &offset_size, section_is_gnu);
22057 if (mac_ptr == NULL)
22059 /* We already issued a complaint. */
22063 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
22064 GDB is still reading the definitions from command line. First
22065 DW_MACINFO_start_file will need to be ignored as it was already executed
22066 to create CURRENT_FILE for the main source holding also the command line
22067 definitions. On first met DW_MACINFO_start_file this flag is reset to
22068 normally execute all the remaining DW_MACINFO_start_file macinfos. */
22070 at_commandline = 1;
22074 /* Do we at least have room for a macinfo type byte? */
22075 if (mac_ptr >= mac_end)
22077 dwarf2_section_buffer_overflow_complaint (section);
22081 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22084 /* Note that we rely on the fact that the corresponding GNU and
22085 DWARF constants are the same. */
22086 switch (macinfo_type)
22088 /* A zero macinfo type indicates the end of the macro
22093 case DW_MACRO_define:
22094 case DW_MACRO_undef:
22095 case DW_MACRO_define_strp:
22096 case DW_MACRO_undef_strp:
22097 case DW_MACRO_define_sup:
22098 case DW_MACRO_undef_sup:
22100 unsigned int bytes_read;
22105 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22106 mac_ptr += bytes_read;
22108 if (macinfo_type == DW_MACRO_define
22109 || macinfo_type == DW_MACRO_undef)
22111 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22112 mac_ptr += bytes_read;
22116 LONGEST str_offset;
22118 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22119 mac_ptr += offset_size;
22121 if (macinfo_type == DW_MACRO_define_sup
22122 || macinfo_type == DW_MACRO_undef_sup
22125 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22127 body = read_indirect_string_from_dwz (dwz, str_offset);
22130 body = read_indirect_string_at_offset (abfd, str_offset);
22133 is_define = (macinfo_type == DW_MACRO_define
22134 || macinfo_type == DW_MACRO_define_strp
22135 || macinfo_type == DW_MACRO_define_sup);
22136 if (! current_file)
22138 /* DWARF violation as no main source is present. */
22139 complaint (&symfile_complaints,
22140 _("debug info with no main source gives macro %s "
22142 is_define ? _("definition") : _("undefinition"),
22146 if ((line == 0 && !at_commandline)
22147 || (line != 0 && at_commandline))
22148 complaint (&symfile_complaints,
22149 _("debug info gives %s macro %s with %s line %d: %s"),
22150 at_commandline ? _("command-line") : _("in-file"),
22151 is_define ? _("definition") : _("undefinition"),
22152 line == 0 ? _("zero") : _("non-zero"), line, body);
22155 parse_macro_definition (current_file, line, body);
22158 gdb_assert (macinfo_type == DW_MACRO_undef
22159 || macinfo_type == DW_MACRO_undef_strp
22160 || macinfo_type == DW_MACRO_undef_sup);
22161 macro_undef (current_file, line, body);
22166 case DW_MACRO_start_file:
22168 unsigned int bytes_read;
22171 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22172 mac_ptr += bytes_read;
22173 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22174 mac_ptr += bytes_read;
22176 if ((line == 0 && !at_commandline)
22177 || (line != 0 && at_commandline))
22178 complaint (&symfile_complaints,
22179 _("debug info gives source %d included "
22180 "from %s at %s line %d"),
22181 file, at_commandline ? _("command-line") : _("file"),
22182 line == 0 ? _("zero") : _("non-zero"), line);
22184 if (at_commandline)
22186 /* This DW_MACRO_start_file was executed in the
22188 at_commandline = 0;
22191 current_file = macro_start_file (file, line, current_file, lh);
22195 case DW_MACRO_end_file:
22196 if (! current_file)
22197 complaint (&symfile_complaints,
22198 _("macro debug info has an unmatched "
22199 "`close_file' directive"));
22202 current_file = current_file->included_by;
22203 if (! current_file)
22205 enum dwarf_macro_record_type next_type;
22207 /* GCC circa March 2002 doesn't produce the zero
22208 type byte marking the end of the compilation
22209 unit. Complain if it's not there, but exit no
22212 /* Do we at least have room for a macinfo type byte? */
22213 if (mac_ptr >= mac_end)
22215 dwarf2_section_buffer_overflow_complaint (section);
22219 /* We don't increment mac_ptr here, so this is just
22222 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22224 if (next_type != 0)
22225 complaint (&symfile_complaints,
22226 _("no terminating 0-type entry for "
22227 "macros in `.debug_macinfo' section"));
22234 case DW_MACRO_import:
22235 case DW_MACRO_import_sup:
22239 bfd *include_bfd = abfd;
22240 struct dwarf2_section_info *include_section = section;
22241 const gdb_byte *include_mac_end = mac_end;
22242 int is_dwz = section_is_dwz;
22243 const gdb_byte *new_mac_ptr;
22245 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22246 mac_ptr += offset_size;
22248 if (macinfo_type == DW_MACRO_import_sup)
22250 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22252 dwarf2_read_section (objfile, &dwz->macro);
22254 include_section = &dwz->macro;
22255 include_bfd = get_section_bfd_owner (include_section);
22256 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22260 new_mac_ptr = include_section->buffer + offset;
22261 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22265 /* This has actually happened; see
22266 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22267 complaint (&symfile_complaints,
22268 _("recursive DW_MACRO_import in "
22269 ".debug_macro section"));
22273 *slot = (void *) new_mac_ptr;
22275 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22276 include_mac_end, current_file, lh,
22277 section, section_is_gnu, is_dwz,
22278 offset_size, include_hash);
22280 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22285 case DW_MACINFO_vendor_ext:
22286 if (!section_is_gnu)
22288 unsigned int bytes_read;
22290 /* This reads the constant, but since we don't recognize
22291 any vendor extensions, we ignore it. */
22292 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22293 mac_ptr += bytes_read;
22294 read_direct_string (abfd, mac_ptr, &bytes_read);
22295 mac_ptr += bytes_read;
22297 /* We don't recognize any vendor extensions. */
22303 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22304 mac_ptr, mac_end, abfd, offset_size,
22306 if (mac_ptr == NULL)
22310 } while (macinfo_type != 0);
22314 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22315 int section_is_gnu)
22317 struct objfile *objfile = dwarf2_per_objfile->objfile;
22318 struct line_header *lh = cu->line_header;
22320 const gdb_byte *mac_ptr, *mac_end;
22321 struct macro_source_file *current_file = 0;
22322 enum dwarf_macro_record_type macinfo_type;
22323 unsigned int offset_size = cu->header.offset_size;
22324 const gdb_byte *opcode_definitions[256];
22325 struct cleanup *cleanup;
22327 struct dwarf2_section_info *section;
22328 const char *section_name;
22330 if (cu->dwo_unit != NULL)
22332 if (section_is_gnu)
22334 section = &cu->dwo_unit->dwo_file->sections.macro;
22335 section_name = ".debug_macro.dwo";
22339 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22340 section_name = ".debug_macinfo.dwo";
22345 if (section_is_gnu)
22347 section = &dwarf2_per_objfile->macro;
22348 section_name = ".debug_macro";
22352 section = &dwarf2_per_objfile->macinfo;
22353 section_name = ".debug_macinfo";
22357 dwarf2_read_section (objfile, section);
22358 if (section->buffer == NULL)
22360 complaint (&symfile_complaints, _("missing %s section"), section_name);
22363 abfd = get_section_bfd_owner (section);
22365 /* First pass: Find the name of the base filename.
22366 This filename is needed in order to process all macros whose definition
22367 (or undefinition) comes from the command line. These macros are defined
22368 before the first DW_MACINFO_start_file entry, and yet still need to be
22369 associated to the base file.
22371 To determine the base file name, we scan the macro definitions until we
22372 reach the first DW_MACINFO_start_file entry. We then initialize
22373 CURRENT_FILE accordingly so that any macro definition found before the
22374 first DW_MACINFO_start_file can still be associated to the base file. */
22376 mac_ptr = section->buffer + offset;
22377 mac_end = section->buffer + section->size;
22379 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22380 &offset_size, section_is_gnu);
22381 if (mac_ptr == NULL)
22383 /* We already issued a complaint. */
22389 /* Do we at least have room for a macinfo type byte? */
22390 if (mac_ptr >= mac_end)
22392 /* Complaint is printed during the second pass as GDB will probably
22393 stop the first pass earlier upon finding
22394 DW_MACINFO_start_file. */
22398 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22401 /* Note that we rely on the fact that the corresponding GNU and
22402 DWARF constants are the same. */
22403 switch (macinfo_type)
22405 /* A zero macinfo type indicates the end of the macro
22410 case DW_MACRO_define:
22411 case DW_MACRO_undef:
22412 /* Only skip the data by MAC_PTR. */
22414 unsigned int bytes_read;
22416 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22417 mac_ptr += bytes_read;
22418 read_direct_string (abfd, mac_ptr, &bytes_read);
22419 mac_ptr += bytes_read;
22423 case DW_MACRO_start_file:
22425 unsigned int bytes_read;
22428 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22429 mac_ptr += bytes_read;
22430 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22431 mac_ptr += bytes_read;
22433 current_file = macro_start_file (file, line, current_file, lh);
22437 case DW_MACRO_end_file:
22438 /* No data to skip by MAC_PTR. */
22441 case DW_MACRO_define_strp:
22442 case DW_MACRO_undef_strp:
22443 case DW_MACRO_define_sup:
22444 case DW_MACRO_undef_sup:
22446 unsigned int bytes_read;
22448 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22449 mac_ptr += bytes_read;
22450 mac_ptr += offset_size;
22454 case DW_MACRO_import:
22455 case DW_MACRO_import_sup:
22456 /* Note that, according to the spec, a transparent include
22457 chain cannot call DW_MACRO_start_file. So, we can just
22458 skip this opcode. */
22459 mac_ptr += offset_size;
22462 case DW_MACINFO_vendor_ext:
22463 /* Only skip the data by MAC_PTR. */
22464 if (!section_is_gnu)
22466 unsigned int bytes_read;
22468 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22469 mac_ptr += bytes_read;
22470 read_direct_string (abfd, mac_ptr, &bytes_read);
22471 mac_ptr += bytes_read;
22476 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22477 mac_ptr, mac_end, abfd, offset_size,
22479 if (mac_ptr == NULL)
22483 } while (macinfo_type != 0 && current_file == NULL);
22485 /* Second pass: Process all entries.
22487 Use the AT_COMMAND_LINE flag to determine whether we are still processing
22488 command-line macro definitions/undefinitions. This flag is unset when we
22489 reach the first DW_MACINFO_start_file entry. */
22491 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
22493 NULL, xcalloc, xfree));
22494 mac_ptr = section->buffer + offset;
22495 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
22496 *slot = (void *) mac_ptr;
22497 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
22498 current_file, lh, section,
22499 section_is_gnu, 0, offset_size,
22500 include_hash.get ());
22503 /* Check if the attribute's form is a DW_FORM_block*
22504 if so return true else false. */
22507 attr_form_is_block (const struct attribute *attr)
22509 return (attr == NULL ? 0 :
22510 attr->form == DW_FORM_block1
22511 || attr->form == DW_FORM_block2
22512 || attr->form == DW_FORM_block4
22513 || attr->form == DW_FORM_block
22514 || attr->form == DW_FORM_exprloc);
22517 /* Return non-zero if ATTR's value is a section offset --- classes
22518 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
22519 You may use DW_UNSND (attr) to retrieve such offsets.
22521 Section 7.5.4, "Attribute Encodings", explains that no attribute
22522 may have a value that belongs to more than one of these classes; it
22523 would be ambiguous if we did, because we use the same forms for all
22527 attr_form_is_section_offset (const struct attribute *attr)
22529 return (attr->form == DW_FORM_data4
22530 || attr->form == DW_FORM_data8
22531 || attr->form == DW_FORM_sec_offset);
22534 /* Return non-zero if ATTR's value falls in the 'constant' class, or
22535 zero otherwise. When this function returns true, you can apply
22536 dwarf2_get_attr_constant_value to it.
22538 However, note that for some attributes you must check
22539 attr_form_is_section_offset before using this test. DW_FORM_data4
22540 and DW_FORM_data8 are members of both the constant class, and of
22541 the classes that contain offsets into other debug sections
22542 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
22543 that, if an attribute's can be either a constant or one of the
22544 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
22545 taken as section offsets, not constants.
22547 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
22548 cannot handle that. */
22551 attr_form_is_constant (const struct attribute *attr)
22553 switch (attr->form)
22555 case DW_FORM_sdata:
22556 case DW_FORM_udata:
22557 case DW_FORM_data1:
22558 case DW_FORM_data2:
22559 case DW_FORM_data4:
22560 case DW_FORM_data8:
22561 case DW_FORM_implicit_const:
22569 /* DW_ADDR is always stored already as sect_offset; despite for the forms
22570 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
22573 attr_form_is_ref (const struct attribute *attr)
22575 switch (attr->form)
22577 case DW_FORM_ref_addr:
22582 case DW_FORM_ref_udata:
22583 case DW_FORM_GNU_ref_alt:
22590 /* Return the .debug_loc section to use for CU.
22591 For DWO files use .debug_loc.dwo. */
22593 static struct dwarf2_section_info *
22594 cu_debug_loc_section (struct dwarf2_cu *cu)
22598 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
22600 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
22602 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
22603 : &dwarf2_per_objfile->loc);
22606 /* A helper function that fills in a dwarf2_loclist_baton. */
22609 fill_in_loclist_baton (struct dwarf2_cu *cu,
22610 struct dwarf2_loclist_baton *baton,
22611 const struct attribute *attr)
22613 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22615 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
22617 baton->per_cu = cu->per_cu;
22618 gdb_assert (baton->per_cu);
22619 /* We don't know how long the location list is, but make sure we
22620 don't run off the edge of the section. */
22621 baton->size = section->size - DW_UNSND (attr);
22622 baton->data = section->buffer + DW_UNSND (attr);
22623 baton->base_address = cu->base_address;
22624 baton->from_dwo = cu->dwo_unit != NULL;
22628 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
22629 struct dwarf2_cu *cu, int is_block)
22631 struct objfile *objfile = dwarf2_per_objfile->objfile;
22632 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22634 if (attr_form_is_section_offset (attr)
22635 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
22636 the section. If so, fall through to the complaint in the
22638 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
22640 struct dwarf2_loclist_baton *baton;
22642 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
22644 fill_in_loclist_baton (cu, baton, attr);
22646 if (cu->base_known == 0)
22647 complaint (&symfile_complaints,
22648 _("Location list used without "
22649 "specifying the CU base address."));
22651 SYMBOL_ACLASS_INDEX (sym) = (is_block
22652 ? dwarf2_loclist_block_index
22653 : dwarf2_loclist_index);
22654 SYMBOL_LOCATION_BATON (sym) = baton;
22658 struct dwarf2_locexpr_baton *baton;
22660 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
22661 baton->per_cu = cu->per_cu;
22662 gdb_assert (baton->per_cu);
22664 if (attr_form_is_block (attr))
22666 /* Note that we're just copying the block's data pointer
22667 here, not the actual data. We're still pointing into the
22668 info_buffer for SYM's objfile; right now we never release
22669 that buffer, but when we do clean up properly this may
22671 baton->size = DW_BLOCK (attr)->size;
22672 baton->data = DW_BLOCK (attr)->data;
22676 dwarf2_invalid_attrib_class_complaint ("location description",
22677 SYMBOL_NATURAL_NAME (sym));
22681 SYMBOL_ACLASS_INDEX (sym) = (is_block
22682 ? dwarf2_locexpr_block_index
22683 : dwarf2_locexpr_index);
22684 SYMBOL_LOCATION_BATON (sym) = baton;
22688 /* Return the OBJFILE associated with the compilation unit CU. If CU
22689 came from a separate debuginfo file, then the master objfile is
22693 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
22695 struct objfile *objfile = per_cu->objfile;
22697 /* Return the master objfile, so that we can report and look up the
22698 correct file containing this variable. */
22699 if (objfile->separate_debug_objfile_backlink)
22700 objfile = objfile->separate_debug_objfile_backlink;
22705 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
22706 (CU_HEADERP is unused in such case) or prepare a temporary copy at
22707 CU_HEADERP first. */
22709 static const struct comp_unit_head *
22710 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
22711 struct dwarf2_per_cu_data *per_cu)
22713 const gdb_byte *info_ptr;
22716 return &per_cu->cu->header;
22718 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
22720 memset (cu_headerp, 0, sizeof (*cu_headerp));
22721 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
22722 rcuh_kind::COMPILE);
22727 /* Return the address size given in the compilation unit header for CU. */
22730 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
22732 struct comp_unit_head cu_header_local;
22733 const struct comp_unit_head *cu_headerp;
22735 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22737 return cu_headerp->addr_size;
22740 /* Return the offset size given in the compilation unit header for CU. */
22743 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
22745 struct comp_unit_head cu_header_local;
22746 const struct comp_unit_head *cu_headerp;
22748 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22750 return cu_headerp->offset_size;
22753 /* See its dwarf2loc.h declaration. */
22756 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
22758 struct comp_unit_head cu_header_local;
22759 const struct comp_unit_head *cu_headerp;
22761 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22763 if (cu_headerp->version == 2)
22764 return cu_headerp->addr_size;
22766 return cu_headerp->offset_size;
22769 /* Return the text offset of the CU. The returned offset comes from
22770 this CU's objfile. If this objfile came from a separate debuginfo
22771 file, then the offset may be different from the corresponding
22772 offset in the parent objfile. */
22775 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22777 struct objfile *objfile = per_cu->objfile;
22779 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22782 /* Return DWARF version number of PER_CU. */
22785 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
22787 return per_cu->dwarf_version;
22790 /* Locate the .debug_info compilation unit from CU's objfile which contains
22791 the DIE at OFFSET. Raises an error on failure. */
22793 static struct dwarf2_per_cu_data *
22794 dwarf2_find_containing_comp_unit (sect_offset sect_off,
22795 unsigned int offset_in_dwz,
22796 struct objfile *objfile)
22798 struct dwarf2_per_cu_data *this_cu;
22800 const sect_offset *cu_off;
22803 high = dwarf2_per_objfile->n_comp_units - 1;
22806 struct dwarf2_per_cu_data *mid_cu;
22807 int mid = low + (high - low) / 2;
22809 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22810 cu_off = &mid_cu->sect_off;
22811 if (mid_cu->is_dwz > offset_in_dwz
22812 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
22817 gdb_assert (low == high);
22818 this_cu = dwarf2_per_objfile->all_comp_units[low];
22819 cu_off = &this_cu->sect_off;
22820 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
22822 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22823 error (_("Dwarf Error: could not find partial DIE containing "
22824 "offset 0x%x [in module %s]"),
22825 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
22827 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
22829 return dwarf2_per_objfile->all_comp_units[low-1];
22833 this_cu = dwarf2_per_objfile->all_comp_units[low];
22834 if (low == dwarf2_per_objfile->n_comp_units - 1
22835 && sect_off >= this_cu->sect_off + this_cu->length)
22836 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
22837 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
22842 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22845 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22847 memset (cu, 0, sizeof (*cu));
22849 cu->per_cu = per_cu;
22850 cu->objfile = per_cu->objfile;
22851 obstack_init (&cu->comp_unit_obstack);
22854 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22857 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22858 enum language pretend_language)
22860 struct attribute *attr;
22862 /* Set the language we're debugging. */
22863 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22865 set_cu_language (DW_UNSND (attr), cu);
22868 cu->language = pretend_language;
22869 cu->language_defn = language_def (cu->language);
22872 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22875 /* Release one cached compilation unit, CU. We unlink it from the tree
22876 of compilation units, but we don't remove it from the read_in_chain;
22877 the caller is responsible for that.
22878 NOTE: DATA is a void * because this function is also used as a
22879 cleanup routine. */
22882 free_heap_comp_unit (void *data)
22884 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22886 gdb_assert (cu->per_cu != NULL);
22887 cu->per_cu->cu = NULL;
22890 obstack_free (&cu->comp_unit_obstack, NULL);
22895 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22896 when we're finished with it. We can't free the pointer itself, but be
22897 sure to unlink it from the cache. Also release any associated storage. */
22900 free_stack_comp_unit (void *data)
22902 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22904 gdb_assert (cu->per_cu != NULL);
22905 cu->per_cu->cu = NULL;
22908 obstack_free (&cu->comp_unit_obstack, NULL);
22909 cu->partial_dies = NULL;
22912 /* Free all cached compilation units. */
22915 free_cached_comp_units (void *data)
22917 dwarf2_per_objfile->free_cached_comp_units ();
22920 /* Increase the age counter on each cached compilation unit, and free
22921 any that are too old. */
22924 age_cached_comp_units (void)
22926 struct dwarf2_per_cu_data *per_cu, **last_chain;
22928 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22929 per_cu = dwarf2_per_objfile->read_in_chain;
22930 while (per_cu != NULL)
22932 per_cu->cu->last_used ++;
22933 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22934 dwarf2_mark (per_cu->cu);
22935 per_cu = per_cu->cu->read_in_chain;
22938 per_cu = dwarf2_per_objfile->read_in_chain;
22939 last_chain = &dwarf2_per_objfile->read_in_chain;
22940 while (per_cu != NULL)
22942 struct dwarf2_per_cu_data *next_cu;
22944 next_cu = per_cu->cu->read_in_chain;
22946 if (!per_cu->cu->mark)
22948 free_heap_comp_unit (per_cu->cu);
22949 *last_chain = next_cu;
22952 last_chain = &per_cu->cu->read_in_chain;
22958 /* Remove a single compilation unit from the cache. */
22961 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22963 struct dwarf2_per_cu_data *per_cu, **last_chain;
22965 per_cu = dwarf2_per_objfile->read_in_chain;
22966 last_chain = &dwarf2_per_objfile->read_in_chain;
22967 while (per_cu != NULL)
22969 struct dwarf2_per_cu_data *next_cu;
22971 next_cu = per_cu->cu->read_in_chain;
22973 if (per_cu == target_per_cu)
22975 free_heap_comp_unit (per_cu->cu);
22977 *last_chain = next_cu;
22981 last_chain = &per_cu->cu->read_in_chain;
22987 /* Release all extra memory associated with OBJFILE. */
22990 dwarf2_free_objfile (struct objfile *objfile)
22993 = (struct dwarf2_per_objfile *) objfile_data (objfile,
22994 dwarf2_objfile_data_key);
22996 if (dwarf2_per_objfile == NULL)
22999 dwarf2_per_objfile->~dwarf2_per_objfile ();
23002 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
23003 We store these in a hash table separate from the DIEs, and preserve them
23004 when the DIEs are flushed out of cache.
23006 The CU "per_cu" pointer is needed because offset alone is not enough to
23007 uniquely identify the type. A file may have multiple .debug_types sections,
23008 or the type may come from a DWO file. Furthermore, while it's more logical
23009 to use per_cu->section+offset, with Fission the section with the data is in
23010 the DWO file but we don't know that section at the point we need it.
23011 We have to use something in dwarf2_per_cu_data (or the pointer to it)
23012 because we can enter the lookup routine, get_die_type_at_offset, from
23013 outside this file, and thus won't necessarily have PER_CU->cu.
23014 Fortunately, PER_CU is stable for the life of the objfile. */
23016 struct dwarf2_per_cu_offset_and_type
23018 const struct dwarf2_per_cu_data *per_cu;
23019 sect_offset sect_off;
23023 /* Hash function for a dwarf2_per_cu_offset_and_type. */
23026 per_cu_offset_and_type_hash (const void *item)
23028 const struct dwarf2_per_cu_offset_and_type *ofs
23029 = (const struct dwarf2_per_cu_offset_and_type *) item;
23031 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
23034 /* Equality function for a dwarf2_per_cu_offset_and_type. */
23037 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
23039 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
23040 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
23041 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
23042 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
23044 return (ofs_lhs->per_cu == ofs_rhs->per_cu
23045 && ofs_lhs->sect_off == ofs_rhs->sect_off);
23048 /* Set the type associated with DIE to TYPE. Save it in CU's hash
23049 table if necessary. For convenience, return TYPE.
23051 The DIEs reading must have careful ordering to:
23052 * Not cause infite loops trying to read in DIEs as a prerequisite for
23053 reading current DIE.
23054 * Not trying to dereference contents of still incompletely read in types
23055 while reading in other DIEs.
23056 * Enable referencing still incompletely read in types just by a pointer to
23057 the type without accessing its fields.
23059 Therefore caller should follow these rules:
23060 * Try to fetch any prerequisite types we may need to build this DIE type
23061 before building the type and calling set_die_type.
23062 * After building type call set_die_type for current DIE as soon as
23063 possible before fetching more types to complete the current type.
23064 * Make the type as complete as possible before fetching more types. */
23066 static struct type *
23067 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
23069 struct dwarf2_per_cu_offset_and_type **slot, ofs;
23070 struct objfile *objfile = cu->objfile;
23071 struct attribute *attr;
23072 struct dynamic_prop prop;
23074 /* For Ada types, make sure that the gnat-specific data is always
23075 initialized (if not already set). There are a few types where
23076 we should not be doing so, because the type-specific area is
23077 already used to hold some other piece of info (eg: TYPE_CODE_FLT
23078 where the type-specific area is used to store the floatformat).
23079 But this is not a problem, because the gnat-specific information
23080 is actually not needed for these types. */
23081 if (need_gnat_info (cu)
23082 && TYPE_CODE (type) != TYPE_CODE_FUNC
23083 && TYPE_CODE (type) != TYPE_CODE_FLT
23084 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
23085 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23086 && TYPE_CODE (type) != TYPE_CODE_METHOD
23087 && !HAVE_GNAT_AUX_INFO (type))
23088 INIT_GNAT_SPECIFIC (type);
23090 /* Read DW_AT_allocated and set in type. */
23091 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23092 if (attr_form_is_block (attr))
23094 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23095 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23097 else if (attr != NULL)
23099 complaint (&symfile_complaints,
23100 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23101 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23102 to_underlying (die->sect_off));
23105 /* Read DW_AT_associated and set in type. */
23106 attr = dwarf2_attr (die, DW_AT_associated, cu);
23107 if (attr_form_is_block (attr))
23109 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23110 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23112 else if (attr != NULL)
23114 complaint (&symfile_complaints,
23115 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23116 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23117 to_underlying (die->sect_off));
23120 /* Read DW_AT_data_location and set in type. */
23121 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23122 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23123 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23125 if (dwarf2_per_objfile->die_type_hash == NULL)
23127 dwarf2_per_objfile->die_type_hash =
23128 htab_create_alloc_ex (127,
23129 per_cu_offset_and_type_hash,
23130 per_cu_offset_and_type_eq,
23132 &objfile->objfile_obstack,
23133 hashtab_obstack_allocate,
23134 dummy_obstack_deallocate);
23137 ofs.per_cu = cu->per_cu;
23138 ofs.sect_off = die->sect_off;
23140 slot = (struct dwarf2_per_cu_offset_and_type **)
23141 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23143 complaint (&symfile_complaints,
23144 _("A problem internal to GDB: DIE 0x%x has type already set"),
23145 to_underlying (die->sect_off));
23146 *slot = XOBNEW (&objfile->objfile_obstack,
23147 struct dwarf2_per_cu_offset_and_type);
23152 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23153 or return NULL if the die does not have a saved type. */
23155 static struct type *
23156 get_die_type_at_offset (sect_offset sect_off,
23157 struct dwarf2_per_cu_data *per_cu)
23159 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23161 if (dwarf2_per_objfile->die_type_hash == NULL)
23164 ofs.per_cu = per_cu;
23165 ofs.sect_off = sect_off;
23166 slot = ((struct dwarf2_per_cu_offset_and_type *)
23167 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23174 /* Look up the type for DIE in CU in die_type_hash,
23175 or return NULL if DIE does not have a saved type. */
23177 static struct type *
23178 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23180 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23183 /* Add a dependence relationship from CU to REF_PER_CU. */
23186 dwarf2_add_dependence (struct dwarf2_cu *cu,
23187 struct dwarf2_per_cu_data *ref_per_cu)
23191 if (cu->dependencies == NULL)
23193 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23194 NULL, &cu->comp_unit_obstack,
23195 hashtab_obstack_allocate,
23196 dummy_obstack_deallocate);
23198 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23200 *slot = ref_per_cu;
23203 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23204 Set the mark field in every compilation unit in the
23205 cache that we must keep because we are keeping CU. */
23208 dwarf2_mark_helper (void **slot, void *data)
23210 struct dwarf2_per_cu_data *per_cu;
23212 per_cu = (struct dwarf2_per_cu_data *) *slot;
23214 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23215 reading of the chain. As such dependencies remain valid it is not much
23216 useful to track and undo them during QUIT cleanups. */
23217 if (per_cu->cu == NULL)
23220 if (per_cu->cu->mark)
23222 per_cu->cu->mark = 1;
23224 if (per_cu->cu->dependencies != NULL)
23225 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23230 /* Set the mark field in CU and in every other compilation unit in the
23231 cache that we must keep because we are keeping CU. */
23234 dwarf2_mark (struct dwarf2_cu *cu)
23239 if (cu->dependencies != NULL)
23240 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23244 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23248 per_cu->cu->mark = 0;
23249 per_cu = per_cu->cu->read_in_chain;
23253 /* Trivial hash function for partial_die_info: the hash value of a DIE
23254 is its offset in .debug_info for this objfile. */
23257 partial_die_hash (const void *item)
23259 const struct partial_die_info *part_die
23260 = (const struct partial_die_info *) item;
23262 return to_underlying (part_die->sect_off);
23265 /* Trivial comparison function for partial_die_info structures: two DIEs
23266 are equal if they have the same offset. */
23269 partial_die_eq (const void *item_lhs, const void *item_rhs)
23271 const struct partial_die_info *part_die_lhs
23272 = (const struct partial_die_info *) item_lhs;
23273 const struct partial_die_info *part_die_rhs
23274 = (const struct partial_die_info *) item_rhs;
23276 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23279 static struct cmd_list_element *set_dwarf_cmdlist;
23280 static struct cmd_list_element *show_dwarf_cmdlist;
23283 set_dwarf_cmd (char *args, int from_tty)
23285 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23290 show_dwarf_cmd (char *args, int from_tty)
23292 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23295 /* Free data associated with OBJFILE, if necessary. */
23298 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23300 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23303 /* Make sure we don't accidentally use dwarf2_per_objfile while
23305 dwarf2_per_objfile = NULL;
23307 for (ix = 0; ix < data->n_comp_units; ++ix)
23308 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23310 for (ix = 0; ix < data->n_type_units; ++ix)
23311 VEC_free (dwarf2_per_cu_ptr,
23312 data->all_type_units[ix]->per_cu.imported_symtabs);
23313 xfree (data->all_type_units);
23315 VEC_free (dwarf2_section_info_def, data->types);
23317 if (data->dwo_files)
23318 free_dwo_files (data->dwo_files, objfile);
23319 if (data->dwp_file)
23320 gdb_bfd_unref (data->dwp_file->dbfd);
23322 if (data->dwz_file && data->dwz_file->dwz_bfd)
23323 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23327 /* The "save gdb-index" command. */
23329 /* In-memory buffer to prepare data to be written later to a file. */
23333 /* Copy DATA to the end of the buffer. */
23334 template<typename T>
23335 void append_data (const T &data)
23337 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23338 reinterpret_cast<const gdb_byte *> (&data + 1),
23339 grow (sizeof (data)));
23342 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23343 terminating zero is appended too. */
23344 void append_cstr0 (const char *cstr)
23346 const size_t size = strlen (cstr) + 1;
23347 std::copy (cstr, cstr + size, grow (size));
23350 /* Accept a host-format integer in VAL and append it to the buffer
23351 as a target-format integer which is LEN bytes long. */
23352 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23354 ::store_unsigned_integer (grow (len), len, byte_order, val);
23357 /* Return the size of the buffer. */
23358 size_t size () const
23360 return m_vec.size ();
23363 /* Write the buffer to FILE. */
23364 void file_write (FILE *file) const
23366 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23367 error (_("couldn't write data to file"));
23371 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23372 the start of the new block. */
23373 gdb_byte *grow (size_t size)
23375 m_vec.resize (m_vec.size () + size);
23376 return &*m_vec.end () - size;
23379 gdb::byte_vector m_vec;
23382 /* An entry in the symbol table. */
23383 struct symtab_index_entry
23385 /* The name of the symbol. */
23387 /* The offset of the name in the constant pool. */
23388 offset_type index_offset;
23389 /* A sorted vector of the indices of all the CUs that hold an object
23391 std::vector<offset_type> cu_indices;
23394 /* The symbol table. This is a power-of-2-sized hash table. */
23395 struct mapped_symtab
23399 data.resize (1024);
23402 offset_type n_elements = 0;
23403 std::vector<symtab_index_entry> data;
23406 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
23409 Function is used only during write_hash_table so no index format backward
23410 compatibility is needed. */
23412 static symtab_index_entry &
23413 find_slot (struct mapped_symtab *symtab, const char *name)
23415 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
23417 index = hash & (symtab->data.size () - 1);
23418 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
23422 if (symtab->data[index].name == NULL
23423 || strcmp (name, symtab->data[index].name) == 0)
23424 return symtab->data[index];
23425 index = (index + step) & (symtab->data.size () - 1);
23429 /* Expand SYMTAB's hash table. */
23432 hash_expand (struct mapped_symtab *symtab)
23434 auto old_entries = std::move (symtab->data);
23436 symtab->data.clear ();
23437 symtab->data.resize (old_entries.size () * 2);
23439 for (auto &it : old_entries)
23440 if (it.name != NULL)
23442 auto &ref = find_slot (symtab, it.name);
23443 ref = std::move (it);
23447 /* Add an entry to SYMTAB. NAME is the name of the symbol.
23448 CU_INDEX is the index of the CU in which the symbol appears.
23449 IS_STATIC is one if the symbol is static, otherwise zero (global). */
23452 add_index_entry (struct mapped_symtab *symtab, const char *name,
23453 int is_static, gdb_index_symbol_kind kind,
23454 offset_type cu_index)
23456 offset_type cu_index_and_attrs;
23458 ++symtab->n_elements;
23459 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
23460 hash_expand (symtab);
23462 symtab_index_entry &slot = find_slot (symtab, name);
23463 if (slot.name == NULL)
23466 /* index_offset is set later. */
23469 cu_index_and_attrs = 0;
23470 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
23471 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
23472 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
23474 /* We don't want to record an index value twice as we want to avoid the
23476 We process all global symbols and then all static symbols
23477 (which would allow us to avoid the duplication by only having to check
23478 the last entry pushed), but a symbol could have multiple kinds in one CU.
23479 To keep things simple we don't worry about the duplication here and
23480 sort and uniqufy the list after we've processed all symbols. */
23481 slot.cu_indices.push_back (cu_index_and_attrs);
23484 /* Sort and remove duplicates of all symbols' cu_indices lists. */
23487 uniquify_cu_indices (struct mapped_symtab *symtab)
23489 for (auto &entry : symtab->data)
23491 if (entry.name != NULL && !entry.cu_indices.empty ())
23493 auto &cu_indices = entry.cu_indices;
23494 std::sort (cu_indices.begin (), cu_indices.end ());
23495 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
23496 cu_indices.erase (from, cu_indices.end ());
23501 /* A form of 'const char *' suitable for container keys. Only the
23502 pointer is stored. The strings themselves are compared, not the
23507 c_str_view (const char *cstr)
23511 bool operator== (const c_str_view &other) const
23513 return strcmp (m_cstr, other.m_cstr) == 0;
23517 friend class c_str_view_hasher;
23518 const char *const m_cstr;
23521 /* A std::unordered_map::hasher for c_str_view that uses the right
23522 hash function for strings in a mapped index. */
23523 class c_str_view_hasher
23526 size_t operator () (const c_str_view &x) const
23528 return mapped_index_string_hash (INT_MAX, x.m_cstr);
23532 /* A std::unordered_map::hasher for std::vector<>. */
23533 template<typename T>
23534 class vector_hasher
23537 size_t operator () (const std::vector<T> &key) const
23539 return iterative_hash (key.data (),
23540 sizeof (key.front ()) * key.size (), 0);
23544 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
23545 constant pool entries going into the data buffer CPOOL. */
23548 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
23551 /* Elements are sorted vectors of the indices of all the CUs that
23552 hold an object of this name. */
23553 std::unordered_map<std::vector<offset_type>, offset_type,
23554 vector_hasher<offset_type>>
23557 /* We add all the index vectors to the constant pool first, to
23558 ensure alignment is ok. */
23559 for (symtab_index_entry &entry : symtab->data)
23561 if (entry.name == NULL)
23563 gdb_assert (entry.index_offset == 0);
23565 /* Finding before inserting is faster than always trying to
23566 insert, because inserting always allocates a node, does the
23567 lookup, and then destroys the new node if another node
23568 already had the same key. C++17 try_emplace will avoid
23571 = symbol_hash_table.find (entry.cu_indices);
23572 if (found != symbol_hash_table.end ())
23574 entry.index_offset = found->second;
23578 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
23579 entry.index_offset = cpool.size ();
23580 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
23581 for (const auto index : entry.cu_indices)
23582 cpool.append_data (MAYBE_SWAP (index));
23586 /* Now write out the hash table. */
23587 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
23588 for (const auto &entry : symtab->data)
23590 offset_type str_off, vec_off;
23592 if (entry.name != NULL)
23594 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
23595 if (insertpair.second)
23596 cpool.append_cstr0 (entry.name);
23597 str_off = insertpair.first->second;
23598 vec_off = entry.index_offset;
23602 /* While 0 is a valid constant pool index, it is not valid
23603 to have 0 for both offsets. */
23608 output.append_data (MAYBE_SWAP (str_off));
23609 output.append_data (MAYBE_SWAP (vec_off));
23613 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
23615 /* Helper struct for building the address table. */
23616 struct addrmap_index_data
23618 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
23619 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
23622 struct objfile *objfile;
23623 data_buf &addr_vec;
23624 psym_index_map &cu_index_htab;
23626 /* Non-zero if the previous_* fields are valid.
23627 We can't write an entry until we see the next entry (since it is only then
23628 that we know the end of the entry). */
23629 int previous_valid;
23630 /* Index of the CU in the table of all CUs in the index file. */
23631 unsigned int previous_cu_index;
23632 /* Start address of the CU. */
23633 CORE_ADDR previous_cu_start;
23636 /* Write an address entry to ADDR_VEC. */
23639 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
23640 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23642 CORE_ADDR baseaddr;
23644 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23646 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
23647 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
23648 addr_vec.append_data (MAYBE_SWAP (cu_index));
23651 /* Worker function for traversing an addrmap to build the address table. */
23654 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23656 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23657 struct partial_symtab *pst = (struct partial_symtab *) obj;
23659 if (data->previous_valid)
23660 add_address_entry (data->objfile, data->addr_vec,
23661 data->previous_cu_start, start_addr,
23662 data->previous_cu_index);
23664 data->previous_cu_start = start_addr;
23667 const auto it = data->cu_index_htab.find (pst);
23668 gdb_assert (it != data->cu_index_htab.cend ());
23669 data->previous_cu_index = it->second;
23670 data->previous_valid = 1;
23673 data->previous_valid = 0;
23678 /* Write OBJFILE's address map to ADDR_VEC.
23679 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23680 in the index file. */
23683 write_address_map (struct objfile *objfile, data_buf &addr_vec,
23684 psym_index_map &cu_index_htab)
23686 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
23688 /* When writing the address table, we have to cope with the fact that
23689 the addrmap iterator only provides the start of a region; we have to
23690 wait until the next invocation to get the start of the next region. */
23692 addrmap_index_data.objfile = objfile;
23693 addrmap_index_data.previous_valid = 0;
23695 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23696 &addrmap_index_data);
23698 /* It's highly unlikely the last entry (end address = 0xff...ff)
23699 is valid, but we should still handle it.
23700 The end address is recorded as the start of the next region, but that
23701 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23703 if (addrmap_index_data.previous_valid)
23704 add_address_entry (objfile, addr_vec,
23705 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23706 addrmap_index_data.previous_cu_index);
23709 /* Return the symbol kind of PSYM. */
23711 static gdb_index_symbol_kind
23712 symbol_kind (struct partial_symbol *psym)
23714 domain_enum domain = PSYMBOL_DOMAIN (psym);
23715 enum address_class aclass = PSYMBOL_CLASS (psym);
23723 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23725 return GDB_INDEX_SYMBOL_KIND_TYPE;
23727 case LOC_CONST_BYTES:
23728 case LOC_OPTIMIZED_OUT:
23730 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23732 /* Note: It's currently impossible to recognize psyms as enum values
23733 short of reading the type info. For now punt. */
23734 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23736 /* There are other LOC_FOO values that one might want to classify
23737 as variables, but dwarf2read.c doesn't currently use them. */
23738 return GDB_INDEX_SYMBOL_KIND_OTHER;
23740 case STRUCT_DOMAIN:
23741 return GDB_INDEX_SYMBOL_KIND_TYPE;
23743 return GDB_INDEX_SYMBOL_KIND_OTHER;
23747 /* Add a list of partial symbols to SYMTAB. */
23750 write_psymbols (struct mapped_symtab *symtab,
23751 std::unordered_set<partial_symbol *> &psyms_seen,
23752 struct partial_symbol **psymp,
23754 offset_type cu_index,
23757 for (; count-- > 0; ++psymp)
23759 struct partial_symbol *psym = *psymp;
23761 if (SYMBOL_LANGUAGE (psym) == language_ada)
23762 error (_("Ada is not currently supported by the index"));
23764 /* Only add a given psymbol once. */
23765 if (psyms_seen.insert (psym).second)
23767 gdb_index_symbol_kind kind = symbol_kind (psym);
23769 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23770 is_static, kind, cu_index);
23775 /* A helper struct used when iterating over debug_types. */
23776 struct signatured_type_index_data
23778 signatured_type_index_data (data_buf &types_list_,
23779 std::unordered_set<partial_symbol *> &psyms_seen_)
23780 : types_list (types_list_), psyms_seen (psyms_seen_)
23783 struct objfile *objfile;
23784 struct mapped_symtab *symtab;
23785 data_buf &types_list;
23786 std::unordered_set<partial_symbol *> &psyms_seen;
23790 /* A helper function that writes a single signatured_type to an
23794 write_one_signatured_type (void **slot, void *d)
23796 struct signatured_type_index_data *info
23797 = (struct signatured_type_index_data *) d;
23798 struct signatured_type *entry = (struct signatured_type *) *slot;
23799 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23801 write_psymbols (info->symtab,
23803 info->objfile->global_psymbols.list
23804 + psymtab->globals_offset,
23805 psymtab->n_global_syms, info->cu_index,
23807 write_psymbols (info->symtab,
23809 info->objfile->static_psymbols.list
23810 + psymtab->statics_offset,
23811 psymtab->n_static_syms, info->cu_index,
23814 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23815 to_underlying (entry->per_cu.sect_off));
23816 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23817 to_underlying (entry->type_offset_in_tu));
23818 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
23825 /* Recurse into all "included" dependencies and count their symbols as
23826 if they appeared in this psymtab. */
23829 recursively_count_psymbols (struct partial_symtab *psymtab,
23830 size_t &psyms_seen)
23832 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
23833 if (psymtab->dependencies[i]->user != NULL)
23834 recursively_count_psymbols (psymtab->dependencies[i],
23837 psyms_seen += psymtab->n_global_syms;
23838 psyms_seen += psymtab->n_static_syms;
23841 /* Recurse into all "included" dependencies and write their symbols as
23842 if they appeared in this psymtab. */
23845 recursively_write_psymbols (struct objfile *objfile,
23846 struct partial_symtab *psymtab,
23847 struct mapped_symtab *symtab,
23848 std::unordered_set<partial_symbol *> &psyms_seen,
23849 offset_type cu_index)
23853 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23854 if (psymtab->dependencies[i]->user != NULL)
23855 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23856 symtab, psyms_seen, cu_index);
23858 write_psymbols (symtab,
23860 objfile->global_psymbols.list + psymtab->globals_offset,
23861 psymtab->n_global_syms, cu_index,
23863 write_psymbols (symtab,
23865 objfile->static_psymbols.list + psymtab->statics_offset,
23866 psymtab->n_static_syms, cu_index,
23870 /* Create an index file for OBJFILE in the directory DIR. */
23873 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23875 if (dwarf2_per_objfile->using_index)
23876 error (_("Cannot use an index to create the index"));
23878 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23879 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23881 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23885 if (stat (objfile_name (objfile), &st) < 0)
23886 perror_with_name (objfile_name (objfile));
23888 std::string filename (std::string (dir) + SLASH_STRING
23889 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
23891 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
23893 error (_("Can't open `%s' for writing"), filename.c_str ());
23895 /* Order matters here; we want FILE to be closed before FILENAME is
23896 unlinked, because on MS-Windows one cannot delete a file that is
23897 still open. (Don't call anything here that might throw until
23898 file_closer is created.) */
23899 gdb::unlinker unlink_file (filename.c_str ());
23900 gdb_file_up close_out_file (out_file);
23902 mapped_symtab symtab;
23905 /* While we're scanning CU's create a table that maps a psymtab pointer
23906 (which is what addrmap records) to its index (which is what is recorded
23907 in the index file). This will later be needed to write the address
23909 psym_index_map cu_index_htab;
23910 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
23912 /* The CU list is already sorted, so we don't need to do additional
23913 work here. Also, the debug_types entries do not appear in
23914 all_comp_units, but only in their own hash table. */
23916 /* The psyms_seen set is potentially going to be largish (~40k
23917 elements when indexing a -g3 build of GDB itself). Estimate the
23918 number of elements in order to avoid too many rehashes, which
23919 require rebuilding buckets and thus many trips to
23921 size_t psyms_count = 0;
23922 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23924 struct dwarf2_per_cu_data *per_cu
23925 = dwarf2_per_objfile->all_comp_units[i];
23926 struct partial_symtab *psymtab = per_cu->v.psymtab;
23928 if (psymtab != NULL && psymtab->user == NULL)
23929 recursively_count_psymbols (psymtab, psyms_count);
23931 /* Generating an index for gdb itself shows a ratio of
23932 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
23933 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
23934 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23936 struct dwarf2_per_cu_data *per_cu
23937 = dwarf2_per_objfile->all_comp_units[i];
23938 struct partial_symtab *psymtab = per_cu->v.psymtab;
23940 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23941 It may be referenced from a local scope but in such case it does not
23942 need to be present in .gdb_index. */
23943 if (psymtab == NULL)
23946 if (psymtab->user == NULL)
23947 recursively_write_psymbols (objfile, psymtab, &symtab,
23950 const auto insertpair = cu_index_htab.emplace (psymtab, i);
23951 gdb_assert (insertpair.second);
23953 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
23954 to_underlying (per_cu->sect_off));
23955 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
23958 /* Dump the address map. */
23960 write_address_map (objfile, addr_vec, cu_index_htab);
23962 /* Write out the .debug_type entries, if any. */
23963 data_buf types_cu_list;
23964 if (dwarf2_per_objfile->signatured_types)
23966 signatured_type_index_data sig_data (types_cu_list,
23969 sig_data.objfile = objfile;
23970 sig_data.symtab = &symtab;
23971 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23972 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23973 write_one_signatured_type, &sig_data);
23976 /* Now that we've processed all symbols we can shrink their cu_indices
23978 uniquify_cu_indices (&symtab);
23980 data_buf symtab_vec, constant_pool;
23981 write_hash_table (&symtab, symtab_vec, constant_pool);
23984 const offset_type size_of_contents = 6 * sizeof (offset_type);
23985 offset_type total_len = size_of_contents;
23987 /* The version number. */
23988 contents.append_data (MAYBE_SWAP (8));
23990 /* The offset of the CU list from the start of the file. */
23991 contents.append_data (MAYBE_SWAP (total_len));
23992 total_len += cu_list.size ();
23994 /* The offset of the types CU list from the start of the file. */
23995 contents.append_data (MAYBE_SWAP (total_len));
23996 total_len += types_cu_list.size ();
23998 /* The offset of the address table from the start of the file. */
23999 contents.append_data (MAYBE_SWAP (total_len));
24000 total_len += addr_vec.size ();
24002 /* The offset of the symbol table from the start of the file. */
24003 contents.append_data (MAYBE_SWAP (total_len));
24004 total_len += symtab_vec.size ();
24006 /* The offset of the constant pool from the start of the file. */
24007 contents.append_data (MAYBE_SWAP (total_len));
24008 total_len += constant_pool.size ();
24010 gdb_assert (contents.size () == size_of_contents);
24012 contents.file_write (out_file);
24013 cu_list.file_write (out_file);
24014 types_cu_list.file_write (out_file);
24015 addr_vec.file_write (out_file);
24016 symtab_vec.file_write (out_file);
24017 constant_pool.file_write (out_file);
24019 /* We want to keep the file. */
24020 unlink_file.keep ();
24023 /* Implementation of the `save gdb-index' command.
24025 Note that the file format used by this command is documented in the
24026 GDB manual. Any changes here must be documented there. */
24029 save_gdb_index_command (char *arg, int from_tty)
24031 struct objfile *objfile;
24034 error (_("usage: save gdb-index DIRECTORY"));
24036 ALL_OBJFILES (objfile)
24040 /* If the objfile does not correspond to an actual file, skip it. */
24041 if (stat (objfile_name (objfile), &st) < 0)
24045 = (struct dwarf2_per_objfile *) objfile_data (objfile,
24046 dwarf2_objfile_data_key);
24047 if (dwarf2_per_objfile)
24052 write_psymtabs_to_index (objfile, arg);
24054 CATCH (except, RETURN_MASK_ERROR)
24056 exception_fprintf (gdb_stderr, except,
24057 _("Error while writing index for `%s': "),
24058 objfile_name (objfile));
24067 int dwarf_always_disassemble;
24070 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
24071 struct cmd_list_element *c, const char *value)
24073 fprintf_filtered (file,
24074 _("Whether to always disassemble "
24075 "DWARF expressions is %s.\n"),
24080 show_check_physname (struct ui_file *file, int from_tty,
24081 struct cmd_list_element *c, const char *value)
24083 fprintf_filtered (file,
24084 _("Whether to check \"physname\" is %s.\n"),
24089 _initialize_dwarf2_read (void)
24091 struct cmd_list_element *c;
24093 dwarf2_objfile_data_key
24094 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24096 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24097 Set DWARF specific variables.\n\
24098 Configure DWARF variables such as the cache size"),
24099 &set_dwarf_cmdlist, "maintenance set dwarf ",
24100 0/*allow-unknown*/, &maintenance_set_cmdlist);
24102 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24103 Show DWARF specific variables\n\
24104 Show DWARF variables such as the cache size"),
24105 &show_dwarf_cmdlist, "maintenance show dwarf ",
24106 0/*allow-unknown*/, &maintenance_show_cmdlist);
24108 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24109 &dwarf_max_cache_age, _("\
24110 Set the upper bound on the age of cached DWARF compilation units."), _("\
24111 Show the upper bound on the age of cached DWARF compilation units."), _("\
24112 A higher limit means that cached compilation units will be stored\n\
24113 in memory longer, and more total memory will be used. Zero disables\n\
24114 caching, which can slow down startup."),
24116 show_dwarf_max_cache_age,
24117 &set_dwarf_cmdlist,
24118 &show_dwarf_cmdlist);
24120 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24121 &dwarf_always_disassemble, _("\
24122 Set whether `info address' always disassembles DWARF expressions."), _("\
24123 Show whether `info address' always disassembles DWARF expressions."), _("\
24124 When enabled, DWARF expressions are always printed in an assembly-like\n\
24125 syntax. When disabled, expressions will be printed in a more\n\
24126 conversational style, when possible."),
24128 show_dwarf_always_disassemble,
24129 &set_dwarf_cmdlist,
24130 &show_dwarf_cmdlist);
24132 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24133 Set debugging of the DWARF reader."), _("\
24134 Show debugging of the DWARF reader."), _("\
24135 When enabled (non-zero), debugging messages are printed during DWARF\n\
24136 reading and symtab expansion. A value of 1 (one) provides basic\n\
24137 information. A value greater than 1 provides more verbose information."),
24140 &setdebuglist, &showdebuglist);
24142 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24143 Set debugging of the DWARF DIE reader."), _("\
24144 Show debugging of the DWARF DIE reader."), _("\
24145 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24146 The value is the maximum depth to print."),
24149 &setdebuglist, &showdebuglist);
24151 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24152 Set debugging of the dwarf line reader."), _("\
24153 Show debugging of the dwarf line reader."), _("\
24154 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24155 A value of 1 (one) provides basic information.\n\
24156 A value greater than 1 provides more verbose information."),
24159 &setdebuglist, &showdebuglist);
24161 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24162 Set cross-checking of \"physname\" code against demangler."), _("\
24163 Show cross-checking of \"physname\" code against demangler."), _("\
24164 When enabled, GDB's internal \"physname\" code is checked against\n\
24166 NULL, show_check_physname,
24167 &setdebuglist, &showdebuglist);
24169 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24170 no_class, &use_deprecated_index_sections, _("\
24171 Set whether to use deprecated gdb_index sections."), _("\
24172 Show whether to use deprecated gdb_index sections."), _("\
24173 When enabled, deprecated .gdb_index sections are used anyway.\n\
24174 Normally they are ignored either because of a missing feature or\n\
24175 performance issue.\n\
24176 Warning: This option must be enabled before gdb reads the file."),
24179 &setlist, &showlist);
24181 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24183 Save a gdb-index file.\n\
24184 Usage: save gdb-index DIRECTORY"),
24186 set_cmd_completer (c, filename_completer);
24188 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24189 &dwarf2_locexpr_funcs);
24190 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24191 &dwarf2_loclist_funcs);
24193 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24194 &dwarf2_block_frame_base_locexpr_funcs);
24195 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24196 &dwarf2_block_frame_base_loclist_funcs);