1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2014 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 "exceptions.h"
60 #include "completer.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "filestuff.h"
76 #include "gdb_assert.h"
77 #include <sys/types.h>
79 typedef struct symbol *symbolp;
82 /* When == 1, print basic high level tracing messages.
83 When > 1, be more verbose.
84 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
85 static unsigned int dwarf2_read_debug = 0;
87 /* When non-zero, dump DIEs after they are read in. */
88 static unsigned int dwarf2_die_debug = 0;
90 /* When non-zero, cross-check physname against demangler. */
91 static int check_physname = 0;
93 /* When non-zero, do not reject deprecated .gdb_index sections. */
94 static int use_deprecated_index_sections = 0;
96 static const struct objfile_data *dwarf2_objfile_data_key;
98 /* The "aclass" indices for various kinds of computed DWARF symbols. */
100 static int dwarf2_locexpr_index;
101 static int dwarf2_loclist_index;
102 static int dwarf2_locexpr_block_index;
103 static int dwarf2_loclist_block_index;
105 /* A descriptor for dwarf sections.
107 S.ASECTION, SIZE are typically initialized when the objfile is first
108 scanned. BUFFER, READIN are filled in later when the section is read.
109 If the section contained compressed data then SIZE is updated to record
110 the uncompressed size of the section.
112 DWP file format V2 introduces a wrinkle that is easiest to handle by
113 creating the concept of virtual sections contained within a real section.
114 In DWP V2 the sections of the input DWO files are concatenated together
115 into one section, but section offsets are kept relative to the original
117 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
118 the real section this "virtual" section is contained in, and BUFFER,SIZE
119 describe the virtual section. */
121 struct dwarf2_section_info
125 /* If this is a real section, the bfd section. */
127 /* If this is a virtual section, pointer to the containing ("real")
129 struct dwarf2_section_info *containing_section;
131 /* Pointer to section data, only valid if readin. */
132 const gdb_byte *buffer;
133 /* The size of the section, real or virtual. */
135 /* If this is a virtual section, the offset in the real section.
136 Only valid if is_virtual. */
137 bfd_size_type virtual_offset;
138 /* True if we have tried to read this section. */
140 /* True if this is a virtual section, False otherwise.
141 This specifies which of s.asection and s.containing_section to use. */
145 typedef struct dwarf2_section_info dwarf2_section_info_def;
146 DEF_VEC_O (dwarf2_section_info_def);
148 /* All offsets in the index are of this type. It must be
149 architecture-independent. */
150 typedef uint32_t offset_type;
152 DEF_VEC_I (offset_type);
154 /* Ensure only legit values are used. */
155 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
157 gdb_assert ((unsigned int) (value) <= 1); \
158 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
161 /* Ensure only legit values are used. */
162 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
164 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
165 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
166 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
169 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
170 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
172 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
173 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
176 /* A description of the mapped index. The file format is described in
177 a comment by the code that writes the index. */
180 /* Index data format version. */
183 /* The total length of the buffer. */
186 /* A pointer to the address table data. */
187 const gdb_byte *address_table;
189 /* Size of the address table data in bytes. */
190 offset_type address_table_size;
192 /* The symbol table, implemented as a hash table. */
193 const offset_type *symbol_table;
195 /* Size in slots, each slot is 2 offset_types. */
196 offset_type symbol_table_slots;
198 /* A pointer to the constant pool. */
199 const char *constant_pool;
202 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
203 DEF_VEC_P (dwarf2_per_cu_ptr);
205 /* Collection of data recorded per objfile.
206 This hangs off of dwarf2_objfile_data_key. */
208 struct dwarf2_per_objfile
210 struct dwarf2_section_info info;
211 struct dwarf2_section_info abbrev;
212 struct dwarf2_section_info line;
213 struct dwarf2_section_info loc;
214 struct dwarf2_section_info macinfo;
215 struct dwarf2_section_info macro;
216 struct dwarf2_section_info str;
217 struct dwarf2_section_info ranges;
218 struct dwarf2_section_info addr;
219 struct dwarf2_section_info frame;
220 struct dwarf2_section_info eh_frame;
221 struct dwarf2_section_info gdb_index;
223 VEC (dwarf2_section_info_def) *types;
226 struct objfile *objfile;
228 /* Table of all the compilation units. This is used to locate
229 the target compilation unit of a particular reference. */
230 struct dwarf2_per_cu_data **all_comp_units;
232 /* The number of compilation units in ALL_COMP_UNITS. */
235 /* The number of .debug_types-related CUs. */
238 /* The .debug_types-related CUs (TUs).
239 This is stored in malloc space because we may realloc it. */
240 struct signatured_type **all_type_units;
242 /* The number of entries in all_type_unit_groups. */
243 int n_type_unit_groups;
245 /* Table of type unit groups.
246 This exists to make it easy to iterate over all CUs and TU groups. */
247 struct type_unit_group **all_type_unit_groups;
249 /* Table of struct type_unit_group objects.
250 The hash key is the DW_AT_stmt_list value. */
251 htab_t type_unit_groups;
253 /* A table mapping .debug_types signatures to its signatured_type entry.
254 This is NULL if the .debug_types section hasn't been read in yet. */
255 htab_t signatured_types;
257 /* Type unit statistics, to see how well the scaling improvements
261 int nr_uniq_abbrev_tables;
263 int nr_symtab_sharers;
264 int nr_stmt_less_type_units;
267 /* A chain of compilation units that are currently read in, so that
268 they can be freed later. */
269 struct dwarf2_per_cu_data *read_in_chain;
271 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
272 This is NULL if the table hasn't been allocated yet. */
275 /* Non-zero if we've check for whether there is a DWP file. */
278 /* The DWP file if there is one, or NULL. */
279 struct dwp_file *dwp_file;
281 /* The shared '.dwz' file, if one exists. This is used when the
282 original data was compressed using 'dwz -m'. */
283 struct dwz_file *dwz_file;
285 /* A flag indicating wether this objfile has a section loaded at a
287 int has_section_at_zero;
289 /* True if we are using the mapped index,
290 or we are faking it for OBJF_READNOW's sake. */
291 unsigned char using_index;
293 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
294 struct mapped_index *index_table;
296 /* When using index_table, this keeps track of all quick_file_names entries.
297 TUs typically share line table entries with a CU, so we maintain a
298 separate table of all line table entries to support the sharing.
299 Note that while there can be way more TUs than CUs, we've already
300 sorted all the TUs into "type unit groups", grouped by their
301 DW_AT_stmt_list value. Therefore the only sharing done here is with a
302 CU and its associated TU group if there is one. */
303 htab_t quick_file_names_table;
305 /* Set during partial symbol reading, to prevent queueing of full
307 int reading_partial_symbols;
309 /* Table mapping type DIEs to their struct type *.
310 This is NULL if not allocated yet.
311 The mapping is done via (CU/TU + DIE offset) -> type. */
312 htab_t die_type_hash;
314 /* The CUs we recently read. */
315 VEC (dwarf2_per_cu_ptr) *just_read_cus;
318 static struct dwarf2_per_objfile *dwarf2_per_objfile;
320 /* Default names of the debugging sections. */
322 /* Note that if the debugging section has been compressed, it might
323 have a name like .zdebug_info. */
325 static const struct dwarf2_debug_sections dwarf2_elf_names =
327 { ".debug_info", ".zdebug_info" },
328 { ".debug_abbrev", ".zdebug_abbrev" },
329 { ".debug_line", ".zdebug_line" },
330 { ".debug_loc", ".zdebug_loc" },
331 { ".debug_macinfo", ".zdebug_macinfo" },
332 { ".debug_macro", ".zdebug_macro" },
333 { ".debug_str", ".zdebug_str" },
334 { ".debug_ranges", ".zdebug_ranges" },
335 { ".debug_types", ".zdebug_types" },
336 { ".debug_addr", ".zdebug_addr" },
337 { ".debug_frame", ".zdebug_frame" },
338 { ".eh_frame", NULL },
339 { ".gdb_index", ".zgdb_index" },
343 /* List of DWO/DWP sections. */
345 static const struct dwop_section_names
347 struct dwarf2_section_names abbrev_dwo;
348 struct dwarf2_section_names info_dwo;
349 struct dwarf2_section_names line_dwo;
350 struct dwarf2_section_names loc_dwo;
351 struct dwarf2_section_names macinfo_dwo;
352 struct dwarf2_section_names macro_dwo;
353 struct dwarf2_section_names str_dwo;
354 struct dwarf2_section_names str_offsets_dwo;
355 struct dwarf2_section_names types_dwo;
356 struct dwarf2_section_names cu_index;
357 struct dwarf2_section_names tu_index;
361 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
362 { ".debug_info.dwo", ".zdebug_info.dwo" },
363 { ".debug_line.dwo", ".zdebug_line.dwo" },
364 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
365 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
366 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
367 { ".debug_str.dwo", ".zdebug_str.dwo" },
368 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
369 { ".debug_types.dwo", ".zdebug_types.dwo" },
370 { ".debug_cu_index", ".zdebug_cu_index" },
371 { ".debug_tu_index", ".zdebug_tu_index" },
374 /* local data types */
376 /* The data in a compilation unit header, after target2host
377 translation, looks like this. */
378 struct comp_unit_head
382 unsigned char addr_size;
383 unsigned char signed_addr_p;
384 sect_offset abbrev_offset;
386 /* Size of file offsets; either 4 or 8. */
387 unsigned int offset_size;
389 /* Size of the length field; either 4 or 12. */
390 unsigned int initial_length_size;
392 /* Offset to the first byte of this compilation unit header in the
393 .debug_info section, for resolving relative reference dies. */
396 /* Offset to first die in this cu from the start of the cu.
397 This will be the first byte following the compilation unit header. */
398 cu_offset first_die_offset;
401 /* Type used for delaying computation of method physnames.
402 See comments for compute_delayed_physnames. */
403 struct delayed_method_info
405 /* The type to which the method is attached, i.e., its parent class. */
408 /* The index of the method in the type's function fieldlists. */
411 /* The index of the method in the fieldlist. */
414 /* The name of the DIE. */
417 /* The DIE associated with this method. */
418 struct die_info *die;
421 typedef struct delayed_method_info delayed_method_info;
422 DEF_VEC_O (delayed_method_info);
424 /* Internal state when decoding a particular compilation unit. */
427 /* The objfile containing this compilation unit. */
428 struct objfile *objfile;
430 /* The header of the compilation unit. */
431 struct comp_unit_head header;
433 /* Base address of this compilation unit. */
434 CORE_ADDR base_address;
436 /* Non-zero if base_address has been set. */
439 /* The language we are debugging. */
440 enum language language;
441 const struct language_defn *language_defn;
443 const char *producer;
445 /* The generic symbol table building routines have separate lists for
446 file scope symbols and all all other scopes (local scopes). So
447 we need to select the right one to pass to add_symbol_to_list().
448 We do it by keeping a pointer to the correct list in list_in_scope.
450 FIXME: The original dwarf code just treated the file scope as the
451 first local scope, and all other local scopes as nested local
452 scopes, and worked fine. Check to see if we really need to
453 distinguish these in buildsym.c. */
454 struct pending **list_in_scope;
456 /* The abbrev table for this CU.
457 Normally this points to the abbrev table in the objfile.
458 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
459 struct abbrev_table *abbrev_table;
461 /* Hash table holding all the loaded partial DIEs
462 with partial_die->offset.SECT_OFF as hash. */
465 /* Storage for things with the same lifetime as this read-in compilation
466 unit, including partial DIEs. */
467 struct obstack comp_unit_obstack;
469 /* When multiple dwarf2_cu structures are living in memory, this field
470 chains them all together, so that they can be released efficiently.
471 We will probably also want a generation counter so that most-recently-used
472 compilation units are cached... */
473 struct dwarf2_per_cu_data *read_in_chain;
475 /* Backlink to our per_cu entry. */
476 struct dwarf2_per_cu_data *per_cu;
478 /* How many compilation units ago was this CU last referenced? */
481 /* A hash table of DIE cu_offset for following references with
482 die_info->offset.sect_off as hash. */
485 /* Full DIEs if read in. */
486 struct die_info *dies;
488 /* A set of pointers to dwarf2_per_cu_data objects for compilation
489 units referenced by this one. Only set during full symbol processing;
490 partial symbol tables do not have dependencies. */
493 /* Header data from the line table, during full symbol processing. */
494 struct line_header *line_header;
496 /* A list of methods which need to have physnames computed
497 after all type information has been read. */
498 VEC (delayed_method_info) *method_list;
500 /* To be copied to symtab->call_site_htab. */
501 htab_t call_site_htab;
503 /* Non-NULL if this CU came from a DWO file.
504 There is an invariant here that is important to remember:
505 Except for attributes copied from the top level DIE in the "main"
506 (or "stub") file in preparation for reading the DWO file
507 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
508 Either there isn't a DWO file (in which case this is NULL and the point
509 is moot), or there is and either we're not going to read it (in which
510 case this is NULL) or there is and we are reading it (in which case this
512 struct dwo_unit *dwo_unit;
514 /* The DW_AT_addr_base attribute if present, zero otherwise
515 (zero is a valid value though).
516 Note this value comes from the Fission stub CU/TU's DIE. */
519 /* The DW_AT_ranges_base attribute if present, zero otherwise
520 (zero is a valid value though).
521 Note this value comes from the Fission stub CU/TU's DIE.
522 Also note that the value is zero in the non-DWO case so this value can
523 be used without needing to know whether DWO files are in use or not.
524 N.B. This does not apply to DW_AT_ranges appearing in
525 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
526 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
527 DW_AT_ranges_base *would* have to be applied, and we'd have to care
528 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
529 ULONGEST ranges_base;
531 /* Mark used when releasing cached dies. */
532 unsigned int mark : 1;
534 /* This CU references .debug_loc. See the symtab->locations_valid field.
535 This test is imperfect as there may exist optimized debug code not using
536 any location list and still facing inlining issues if handled as
537 unoptimized code. For a future better test see GCC PR other/32998. */
538 unsigned int has_loclist : 1;
540 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
541 if all the producer_is_* fields are valid. This information is cached
542 because profiling CU expansion showed excessive time spent in
543 producer_is_gxx_lt_4_6. */
544 unsigned int checked_producer : 1;
545 unsigned int producer_is_gxx_lt_4_6 : 1;
546 unsigned int producer_is_gcc_lt_4_3 : 1;
547 unsigned int producer_is_icc : 1;
549 /* When set, the file that we're processing is known to have
550 debugging info for C++ namespaces. GCC 3.3.x did not produce
551 this information, but later versions do. */
553 unsigned int processing_has_namespace_info : 1;
556 /* Persistent data held for a compilation unit, even when not
557 processing it. We put a pointer to this structure in the
558 read_symtab_private field of the psymtab. */
560 struct dwarf2_per_cu_data
562 /* The start offset and length of this compilation unit.
563 NOTE: Unlike comp_unit_head.length, this length includes
565 If the DIE refers to a DWO file, this is always of the original die,
570 /* Flag indicating this compilation unit will be read in before
571 any of the current compilation units are processed. */
572 unsigned int queued : 1;
574 /* This flag will be set when reading partial DIEs if we need to load
575 absolutely all DIEs for this compilation unit, instead of just the ones
576 we think are interesting. It gets set if we look for a DIE in the
577 hash table and don't find it. */
578 unsigned int load_all_dies : 1;
580 /* Non-zero if this CU is from .debug_types.
581 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
583 unsigned int is_debug_types : 1;
585 /* Non-zero if this CU is from the .dwz file. */
586 unsigned int is_dwz : 1;
588 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
589 This flag is only valid if is_debug_types is true.
590 We can't read a CU directly from a DWO file: There are required
591 attributes in the stub. */
592 unsigned int reading_dwo_directly : 1;
594 /* Non-zero if the TU has been read.
595 This is used to assist the "Stay in DWO Optimization" for Fission:
596 When reading a DWO, it's faster to read TUs from the DWO instead of
597 fetching them from random other DWOs (due to comdat folding).
598 If the TU has already been read, the optimization is unnecessary
599 (and unwise - we don't want to change where gdb thinks the TU lives
601 This flag is only valid if is_debug_types is true. */
602 unsigned int tu_read : 1;
604 /* The section this CU/TU lives in.
605 If the DIE refers to a DWO file, this is always the original die,
607 struct dwarf2_section_info *section;
609 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
610 of the CU cache it gets reset to NULL again. */
611 struct dwarf2_cu *cu;
613 /* The corresponding objfile.
614 Normally we can get the objfile from dwarf2_per_objfile.
615 However we can enter this file with just a "per_cu" handle. */
616 struct objfile *objfile;
618 /* When using partial symbol tables, the 'psymtab' field is active.
619 Otherwise the 'quick' field is active. */
622 /* The partial symbol table associated with this compilation unit,
623 or NULL for unread partial units. */
624 struct partial_symtab *psymtab;
626 /* Data needed by the "quick" functions. */
627 struct dwarf2_per_cu_quick_data *quick;
630 /* The CUs we import using DW_TAG_imported_unit. This is filled in
631 while reading psymtabs, used to compute the psymtab dependencies,
632 and then cleared. Then it is filled in again while reading full
633 symbols, and only deleted when the objfile is destroyed.
635 This is also used to work around a difference between the way gold
636 generates .gdb_index version <=7 and the way gdb does. Arguably this
637 is a gold bug. For symbols coming from TUs, gold records in the index
638 the CU that includes the TU instead of the TU itself. This breaks
639 dw2_lookup_symbol: It assumes that if the index says symbol X lives
640 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
641 will find X. Alas TUs live in their own symtab, so after expanding CU Y
642 we need to look in TU Z to find X. Fortunately, this is akin to
643 DW_TAG_imported_unit, so we just use the same mechanism: For
644 .gdb_index version <=7 this also records the TUs that the CU referred
645 to. Concurrently with this change gdb was modified to emit version 8
646 indices so we only pay a price for gold generated indices.
647 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
648 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
651 /* Entry in the signatured_types hash table. */
653 struct signatured_type
655 /* The "per_cu" object of this type.
656 This struct is used iff per_cu.is_debug_types.
657 N.B.: This is the first member so that it's easy to convert pointers
659 struct dwarf2_per_cu_data per_cu;
661 /* The type's signature. */
664 /* Offset in the TU of the type's DIE, as read from the TU header.
665 If this TU is a DWO stub and the definition lives in a DWO file
666 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
667 cu_offset type_offset_in_tu;
669 /* Offset in the section of the type's DIE.
670 If the definition lives in a DWO file, this is the offset in the
671 .debug_types.dwo section.
672 The value is zero until the actual value is known.
673 Zero is otherwise not a valid section offset. */
674 sect_offset type_offset_in_section;
676 /* Type units are grouped by their DW_AT_stmt_list entry so that they
677 can share them. This points to the containing symtab. */
678 struct type_unit_group *type_unit_group;
681 The first time we encounter this type we fully read it in and install it
682 in the symbol tables. Subsequent times we only need the type. */
685 /* Containing DWO unit.
686 This field is valid iff per_cu.reading_dwo_directly. */
687 struct dwo_unit *dwo_unit;
690 typedef struct signatured_type *sig_type_ptr;
691 DEF_VEC_P (sig_type_ptr);
693 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
694 This includes type_unit_group and quick_file_names. */
696 struct stmt_list_hash
698 /* The DWO unit this table is from or NULL if there is none. */
699 struct dwo_unit *dwo_unit;
701 /* Offset in .debug_line or .debug_line.dwo. */
702 sect_offset line_offset;
705 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
706 an object of this type. */
708 struct type_unit_group
710 /* dwarf2read.c's main "handle" on a TU symtab.
711 To simplify things we create an artificial CU that "includes" all the
712 type units using this stmt_list so that the rest of the code still has
713 a "per_cu" handle on the symtab.
714 This PER_CU is recognized by having no section. */
715 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
716 struct dwarf2_per_cu_data per_cu;
718 /* The TUs that share this DW_AT_stmt_list entry.
719 This is added to while parsing type units to build partial symtabs,
720 and is deleted afterwards and not used again. */
721 VEC (sig_type_ptr) *tus;
723 /* The primary symtab.
724 Type units in a group needn't all be defined in the same source file,
725 so we create an essentially anonymous symtab as the primary symtab. */
726 struct symtab *primary_symtab;
728 /* The data used to construct the hash key. */
729 struct stmt_list_hash hash;
731 /* The number of symtabs from the line header.
732 The value here must match line_header.num_file_names. */
733 unsigned int num_symtabs;
735 /* The symbol tables for this TU (obtained from the files listed in
737 WARNING: The order of entries here must match the order of entries
738 in the line header. After the first TU using this type_unit_group, the
739 line header for the subsequent TUs is recreated from this. This is done
740 because we need to use the same symtabs for each TU using the same
741 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
742 there's no guarantee the line header doesn't have duplicate entries. */
743 struct symtab **symtabs;
746 /* These sections are what may appear in a (real or virtual) DWO file. */
750 struct dwarf2_section_info abbrev;
751 struct dwarf2_section_info line;
752 struct dwarf2_section_info loc;
753 struct dwarf2_section_info macinfo;
754 struct dwarf2_section_info macro;
755 struct dwarf2_section_info str;
756 struct dwarf2_section_info str_offsets;
757 /* In the case of a virtual DWO file, these two are unused. */
758 struct dwarf2_section_info info;
759 VEC (dwarf2_section_info_def) *types;
762 /* CUs/TUs in DWP/DWO files. */
766 /* Backlink to the containing struct dwo_file. */
767 struct dwo_file *dwo_file;
769 /* The "id" that distinguishes this CU/TU.
770 .debug_info calls this "dwo_id", .debug_types calls this "signature".
771 Since signatures came first, we stick with it for consistency. */
774 /* The section this CU/TU lives in, in the DWO file. */
775 struct dwarf2_section_info *section;
777 /* Same as dwarf2_per_cu_data:{offset,length} but in the DWO section. */
781 /* For types, offset in the type's DIE of the type defined by this TU. */
782 cu_offset type_offset_in_tu;
785 /* include/dwarf2.h defines the DWP section codes.
786 It defines a max value but it doesn't define a min value, which we
787 use for error checking, so provide one. */
789 enum dwp_v2_section_ids
794 /* Data for one DWO file.
796 This includes virtual DWO files (a virtual DWO file is a DWO file as it
797 appears in a DWP file). DWP files don't really have DWO files per se -
798 comdat folding of types "loses" the DWO file they came from, and from
799 a high level view DWP files appear to contain a mass of random types.
800 However, to maintain consistency with the non-DWP case we pretend DWP
801 files contain virtual DWO files, and we assign each TU with one virtual
802 DWO file (generally based on the line and abbrev section offsets -
803 a heuristic that seems to work in practice). */
807 /* The DW_AT_GNU_dwo_name attribute.
808 For virtual DWO files the name is constructed from the section offsets
809 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
810 from related CU+TUs. */
811 const char *dwo_name;
813 /* The DW_AT_comp_dir attribute. */
814 const char *comp_dir;
816 /* The bfd, when the file is open. Otherwise this is NULL.
817 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
820 /* The sections that make up this DWO file.
821 Remember that for virtual DWO files in DWP V2, these are virtual
822 sections (for lack of a better name). */
823 struct dwo_sections sections;
825 /* The CU in the file.
826 We only support one because having more than one requires hacking the
827 dwo_name of each to match, which is highly unlikely to happen.
828 Doing this means all TUs can share comp_dir: We also assume that
829 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
832 /* Table of TUs in the file.
833 Each element is a struct dwo_unit. */
837 /* These sections are what may appear in a DWP file. */
841 /* These are used by both DWP version 1 and 2. */
842 struct dwarf2_section_info str;
843 struct dwarf2_section_info cu_index;
844 struct dwarf2_section_info tu_index;
846 /* These are only used by DWP version 2 files.
847 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
848 sections are referenced by section number, and are not recorded here.
849 In DWP version 2 there is at most one copy of all these sections, each
850 section being (effectively) comprised of the concatenation of all of the
851 individual sections that exist in the version 1 format.
852 To keep the code simple we treat each of these concatenated pieces as a
853 section itself (a virtual section?). */
854 struct dwarf2_section_info abbrev;
855 struct dwarf2_section_info info;
856 struct dwarf2_section_info line;
857 struct dwarf2_section_info loc;
858 struct dwarf2_section_info macinfo;
859 struct dwarf2_section_info macro;
860 struct dwarf2_section_info str_offsets;
861 struct dwarf2_section_info types;
864 /* These sections are what may appear in a virtual DWO file in DWP version 1.
865 A virtual DWO file is a DWO file as it appears in a DWP file. */
867 struct virtual_v1_dwo_sections
869 struct dwarf2_section_info abbrev;
870 struct dwarf2_section_info line;
871 struct dwarf2_section_info loc;
872 struct dwarf2_section_info macinfo;
873 struct dwarf2_section_info macro;
874 struct dwarf2_section_info str_offsets;
875 /* Each DWP hash table entry records one CU or one TU.
876 That is recorded here, and copied to dwo_unit.section. */
877 struct dwarf2_section_info info_or_types;
880 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
881 In version 2, the sections of the DWO files are concatenated together
882 and stored in one section of that name. Thus each ELF section contains
883 several "virtual" sections. */
885 struct virtual_v2_dwo_sections
887 bfd_size_type abbrev_offset;
888 bfd_size_type abbrev_size;
890 bfd_size_type line_offset;
891 bfd_size_type line_size;
893 bfd_size_type loc_offset;
894 bfd_size_type loc_size;
896 bfd_size_type macinfo_offset;
897 bfd_size_type macinfo_size;
899 bfd_size_type macro_offset;
900 bfd_size_type macro_size;
902 bfd_size_type str_offsets_offset;
903 bfd_size_type str_offsets_size;
905 /* Each DWP hash table entry records one CU or one TU.
906 That is recorded here, and copied to dwo_unit.section. */
907 bfd_size_type info_or_types_offset;
908 bfd_size_type info_or_types_size;
911 /* Contents of DWP hash tables. */
913 struct dwp_hash_table
915 uint32_t version, nr_columns;
916 uint32_t nr_units, nr_slots;
917 const gdb_byte *hash_table, *unit_table;
922 const gdb_byte *indices;
926 /* This is indexed by column number and gives the id of the section
928 #define MAX_NR_V2_DWO_SECTIONS \
929 (1 /* .debug_info or .debug_types */ \
930 + 1 /* .debug_abbrev */ \
931 + 1 /* .debug_line */ \
932 + 1 /* .debug_loc */ \
933 + 1 /* .debug_str_offsets */ \
934 + 1 /* .debug_macro or .debug_macinfo */)
935 int section_ids[MAX_NR_V2_DWO_SECTIONS];
936 const gdb_byte *offsets;
937 const gdb_byte *sizes;
942 /* Data for one DWP file. */
946 /* Name of the file. */
949 /* File format version. */
955 /* Section info for this file. */
956 struct dwp_sections sections;
958 /* Table of CUs in the file. */
959 const struct dwp_hash_table *cus;
961 /* Table of TUs in the file. */
962 const struct dwp_hash_table *tus;
964 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
968 /* Table to map ELF section numbers to their sections.
969 This is only needed for the DWP V1 file format. */
970 unsigned int num_sections;
971 asection **elf_sections;
974 /* This represents a '.dwz' file. */
978 /* A dwz file can only contain a few sections. */
979 struct dwarf2_section_info abbrev;
980 struct dwarf2_section_info info;
981 struct dwarf2_section_info str;
982 struct dwarf2_section_info line;
983 struct dwarf2_section_info macro;
984 struct dwarf2_section_info gdb_index;
990 /* Struct used to pass misc. parameters to read_die_and_children, et
991 al. which are used for both .debug_info and .debug_types dies.
992 All parameters here are unchanging for the life of the call. This
993 struct exists to abstract away the constant parameters of die reading. */
995 struct die_reader_specs
997 /* The bfd of die_section. */
1000 /* The CU of the DIE we are parsing. */
1001 struct dwarf2_cu *cu;
1003 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1004 struct dwo_file *dwo_file;
1006 /* The section the die comes from.
1007 This is either .debug_info or .debug_types, or the .dwo variants. */
1008 struct dwarf2_section_info *die_section;
1010 /* die_section->buffer. */
1011 const gdb_byte *buffer;
1013 /* The end of the buffer. */
1014 const gdb_byte *buffer_end;
1016 /* The value of the DW_AT_comp_dir attribute. */
1017 const char *comp_dir;
1020 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1021 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1022 const gdb_byte *info_ptr,
1023 struct die_info *comp_unit_die,
1027 /* The line number information for a compilation unit (found in the
1028 .debug_line section) begins with a "statement program header",
1029 which contains the following information. */
1032 unsigned int total_length;
1033 unsigned short version;
1034 unsigned int header_length;
1035 unsigned char minimum_instruction_length;
1036 unsigned char maximum_ops_per_instruction;
1037 unsigned char default_is_stmt;
1039 unsigned char line_range;
1040 unsigned char opcode_base;
1042 /* standard_opcode_lengths[i] is the number of operands for the
1043 standard opcode whose value is i. This means that
1044 standard_opcode_lengths[0] is unused, and the last meaningful
1045 element is standard_opcode_lengths[opcode_base - 1]. */
1046 unsigned char *standard_opcode_lengths;
1048 /* The include_directories table. NOTE! These strings are not
1049 allocated with xmalloc; instead, they are pointers into
1050 debug_line_buffer. If you try to free them, `free' will get
1052 unsigned int num_include_dirs, include_dirs_size;
1053 const char **include_dirs;
1055 /* The file_names table. NOTE! These strings are not allocated
1056 with xmalloc; instead, they are pointers into debug_line_buffer.
1057 Don't try to free them directly. */
1058 unsigned int num_file_names, file_names_size;
1062 unsigned int dir_index;
1063 unsigned int mod_time;
1064 unsigned int length;
1065 int included_p; /* Non-zero if referenced by the Line Number Program. */
1066 struct symtab *symtab; /* The associated symbol table, if any. */
1069 /* The start and end of the statement program following this
1070 header. These point into dwarf2_per_objfile->line_buffer. */
1071 const gdb_byte *statement_program_start, *statement_program_end;
1074 /* When we construct a partial symbol table entry we only
1075 need this much information. */
1076 struct partial_die_info
1078 /* Offset of this DIE. */
1081 /* DWARF-2 tag for this DIE. */
1082 ENUM_BITFIELD(dwarf_tag) tag : 16;
1084 /* Assorted flags describing the data found in this DIE. */
1085 unsigned int has_children : 1;
1086 unsigned int is_external : 1;
1087 unsigned int is_declaration : 1;
1088 unsigned int has_type : 1;
1089 unsigned int has_specification : 1;
1090 unsigned int has_pc_info : 1;
1091 unsigned int may_be_inlined : 1;
1093 /* Flag set if the SCOPE field of this structure has been
1095 unsigned int scope_set : 1;
1097 /* Flag set if the DIE has a byte_size attribute. */
1098 unsigned int has_byte_size : 1;
1100 /* Flag set if any of the DIE's children are template arguments. */
1101 unsigned int has_template_arguments : 1;
1103 /* Flag set if fixup_partial_die has been called on this die. */
1104 unsigned int fixup_called : 1;
1106 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1107 unsigned int is_dwz : 1;
1109 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1110 unsigned int spec_is_dwz : 1;
1112 /* The name of this DIE. Normally the value of DW_AT_name, but
1113 sometimes a default name for unnamed DIEs. */
1116 /* The linkage name, if present. */
1117 const char *linkage_name;
1119 /* The scope to prepend to our children. This is generally
1120 allocated on the comp_unit_obstack, so will disappear
1121 when this compilation unit leaves the cache. */
1124 /* Some data associated with the partial DIE. The tag determines
1125 which field is live. */
1128 /* The location description associated with this DIE, if any. */
1129 struct dwarf_block *locdesc;
1130 /* The offset of an import, for DW_TAG_imported_unit. */
1134 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1138 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1139 DW_AT_sibling, if any. */
1140 /* NOTE: This member isn't strictly necessary, read_partial_die could
1141 return DW_AT_sibling values to its caller load_partial_dies. */
1142 const gdb_byte *sibling;
1144 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1145 DW_AT_specification (or DW_AT_abstract_origin or
1146 DW_AT_extension). */
1147 sect_offset spec_offset;
1149 /* Pointers to this DIE's parent, first child, and next sibling,
1151 struct partial_die_info *die_parent, *die_child, *die_sibling;
1154 /* This data structure holds the information of an abbrev. */
1157 unsigned int number; /* number identifying abbrev */
1158 enum dwarf_tag tag; /* dwarf tag */
1159 unsigned short has_children; /* boolean */
1160 unsigned short num_attrs; /* number of attributes */
1161 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1162 struct abbrev_info *next; /* next in chain */
1167 ENUM_BITFIELD(dwarf_attribute) name : 16;
1168 ENUM_BITFIELD(dwarf_form) form : 16;
1171 /* Size of abbrev_table.abbrev_hash_table. */
1172 #define ABBREV_HASH_SIZE 121
1174 /* Top level data structure to contain an abbreviation table. */
1178 /* Where the abbrev table came from.
1179 This is used as a sanity check when the table is used. */
1182 /* Storage for the abbrev table. */
1183 struct obstack abbrev_obstack;
1185 /* Hash table of abbrevs.
1186 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1187 It could be statically allocated, but the previous code didn't so we
1189 struct abbrev_info **abbrevs;
1192 /* Attributes have a name and a value. */
1195 ENUM_BITFIELD(dwarf_attribute) name : 16;
1196 ENUM_BITFIELD(dwarf_form) form : 15;
1198 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1199 field should be in u.str (existing only for DW_STRING) but it is kept
1200 here for better struct attribute alignment. */
1201 unsigned int string_is_canonical : 1;
1206 struct dwarf_block *blk;
1215 /* This data structure holds a complete die structure. */
1218 /* DWARF-2 tag for this DIE. */
1219 ENUM_BITFIELD(dwarf_tag) tag : 16;
1221 /* Number of attributes */
1222 unsigned char num_attrs;
1224 /* True if we're presently building the full type name for the
1225 type derived from this DIE. */
1226 unsigned char building_fullname : 1;
1228 /* True if this die is in process. PR 16581. */
1229 unsigned char in_process : 1;
1232 unsigned int abbrev;
1234 /* Offset in .debug_info or .debug_types section. */
1237 /* The dies in a compilation unit form an n-ary tree. PARENT
1238 points to this die's parent; CHILD points to the first child of
1239 this node; and all the children of a given node are chained
1240 together via their SIBLING fields. */
1241 struct die_info *child; /* Its first child, if any. */
1242 struct die_info *sibling; /* Its next sibling, if any. */
1243 struct die_info *parent; /* Its parent, if any. */
1245 /* An array of attributes, with NUM_ATTRS elements. There may be
1246 zero, but it's not common and zero-sized arrays are not
1247 sufficiently portable C. */
1248 struct attribute attrs[1];
1251 /* Get at parts of an attribute structure. */
1253 #define DW_STRING(attr) ((attr)->u.str)
1254 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1255 #define DW_UNSND(attr) ((attr)->u.unsnd)
1256 #define DW_BLOCK(attr) ((attr)->u.blk)
1257 #define DW_SND(attr) ((attr)->u.snd)
1258 #define DW_ADDR(attr) ((attr)->u.addr)
1259 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1261 /* Blocks are a bunch of untyped bytes. */
1266 /* Valid only if SIZE is not zero. */
1267 const gdb_byte *data;
1270 #ifndef ATTR_ALLOC_CHUNK
1271 #define ATTR_ALLOC_CHUNK 4
1274 /* Allocate fields for structs, unions and enums in this size. */
1275 #ifndef DW_FIELD_ALLOC_CHUNK
1276 #define DW_FIELD_ALLOC_CHUNK 4
1279 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1280 but this would require a corresponding change in unpack_field_as_long
1282 static int bits_per_byte = 8;
1284 /* The routines that read and process dies for a C struct or C++ class
1285 pass lists of data member fields and lists of member function fields
1286 in an instance of a field_info structure, as defined below. */
1289 /* List of data member and baseclasses fields. */
1292 struct nextfield *next;
1297 *fields, *baseclasses;
1299 /* Number of fields (including baseclasses). */
1302 /* Number of baseclasses. */
1305 /* Set if the accesibility of one of the fields is not public. */
1306 int non_public_fields;
1308 /* Member function fields array, entries are allocated in the order they
1309 are encountered in the object file. */
1312 struct nextfnfield *next;
1313 struct fn_field fnfield;
1317 /* Member function fieldlist array, contains name of possibly overloaded
1318 member function, number of overloaded member functions and a pointer
1319 to the head of the member function field chain. */
1324 struct nextfnfield *head;
1328 /* Number of entries in the fnfieldlists array. */
1331 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1332 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1333 struct typedef_field_list
1335 struct typedef_field field;
1336 struct typedef_field_list *next;
1338 *typedef_field_list;
1339 unsigned typedef_field_list_count;
1342 /* One item on the queue of compilation units to read in full symbols
1344 struct dwarf2_queue_item
1346 struct dwarf2_per_cu_data *per_cu;
1347 enum language pretend_language;
1348 struct dwarf2_queue_item *next;
1351 /* The current queue. */
1352 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1354 /* Loaded secondary compilation units are kept in memory until they
1355 have not been referenced for the processing of this many
1356 compilation units. Set this to zero to disable caching. Cache
1357 sizes of up to at least twenty will improve startup time for
1358 typical inter-CU-reference binaries, at an obvious memory cost. */
1359 static int dwarf2_max_cache_age = 5;
1361 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1362 struct cmd_list_element *c, const char *value)
1364 fprintf_filtered (file, _("The upper bound on the age of cached "
1365 "dwarf2 compilation units is %s.\n"),
1369 /* local function prototypes */
1371 static const char *get_section_name (const struct dwarf2_section_info *);
1373 static const char *get_section_file_name (const struct dwarf2_section_info *);
1375 static void dwarf2_locate_sections (bfd *, asection *, void *);
1377 static void dwarf2_find_base_address (struct die_info *die,
1378 struct dwarf2_cu *cu);
1380 static struct partial_symtab *create_partial_symtab
1381 (struct dwarf2_per_cu_data *per_cu, const char *name);
1383 static void dwarf2_build_psymtabs_hard (struct objfile *);
1385 static void scan_partial_symbols (struct partial_die_info *,
1386 CORE_ADDR *, CORE_ADDR *,
1387 int, struct dwarf2_cu *);
1389 static void add_partial_symbol (struct partial_die_info *,
1390 struct dwarf2_cu *);
1392 static void add_partial_namespace (struct partial_die_info *pdi,
1393 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1394 int need_pc, struct dwarf2_cu *cu);
1396 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1397 CORE_ADDR *highpc, int need_pc,
1398 struct dwarf2_cu *cu);
1400 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1401 struct dwarf2_cu *cu);
1403 static void add_partial_subprogram (struct partial_die_info *pdi,
1404 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1405 int need_pc, struct dwarf2_cu *cu);
1407 static void dwarf2_read_symtab (struct partial_symtab *,
1410 static void psymtab_to_symtab_1 (struct partial_symtab *);
1412 static struct abbrev_info *abbrev_table_lookup_abbrev
1413 (const struct abbrev_table *, unsigned int);
1415 static struct abbrev_table *abbrev_table_read_table
1416 (struct dwarf2_section_info *, sect_offset);
1418 static void abbrev_table_free (struct abbrev_table *);
1420 static void abbrev_table_free_cleanup (void *);
1422 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1423 struct dwarf2_section_info *);
1425 static void dwarf2_free_abbrev_table (void *);
1427 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1429 static struct partial_die_info *load_partial_dies
1430 (const struct die_reader_specs *, const gdb_byte *, int);
1432 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1433 struct partial_die_info *,
1434 struct abbrev_info *,
1438 static struct partial_die_info *find_partial_die (sect_offset, int,
1439 struct dwarf2_cu *);
1441 static void fixup_partial_die (struct partial_die_info *,
1442 struct dwarf2_cu *);
1444 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1445 struct attribute *, struct attr_abbrev *,
1448 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1450 static int read_1_signed_byte (bfd *, const gdb_byte *);
1452 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1454 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1456 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1458 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1461 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1463 static LONGEST read_checked_initial_length_and_offset
1464 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1465 unsigned int *, unsigned int *);
1467 static LONGEST read_offset (bfd *, const gdb_byte *,
1468 const struct comp_unit_head *,
1471 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1473 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1476 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1478 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1480 static const char *read_indirect_string (bfd *, const gdb_byte *,
1481 const struct comp_unit_head *,
1484 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1486 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1488 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1490 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1494 static const char *read_str_index (const struct die_reader_specs *reader,
1495 ULONGEST str_index);
1497 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1499 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1500 struct dwarf2_cu *);
1502 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1505 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1506 struct dwarf2_cu *cu);
1508 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1510 static struct die_info *die_specification (struct die_info *die,
1511 struct dwarf2_cu **);
1513 static void free_line_header (struct line_header *lh);
1515 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1516 struct dwarf2_cu *cu);
1518 static void dwarf_decode_lines (struct line_header *, const char *,
1519 struct dwarf2_cu *, struct partial_symtab *,
1522 static void dwarf2_start_subfile (const char *, const char *, const char *);
1524 static void dwarf2_start_symtab (struct dwarf2_cu *,
1525 const char *, const char *, CORE_ADDR);
1527 static struct symbol *new_symbol (struct die_info *, struct type *,
1528 struct dwarf2_cu *);
1530 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1531 struct dwarf2_cu *, struct symbol *);
1533 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1534 struct dwarf2_cu *);
1536 static void dwarf2_const_value_attr (const struct attribute *attr,
1539 struct obstack *obstack,
1540 struct dwarf2_cu *cu, LONGEST *value,
1541 const gdb_byte **bytes,
1542 struct dwarf2_locexpr_baton **baton);
1544 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1546 static int need_gnat_info (struct dwarf2_cu *);
1548 static struct type *die_descriptive_type (struct die_info *,
1549 struct dwarf2_cu *);
1551 static void set_descriptive_type (struct type *, struct die_info *,
1552 struct dwarf2_cu *);
1554 static struct type *die_containing_type (struct die_info *,
1555 struct dwarf2_cu *);
1557 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1558 struct dwarf2_cu *);
1560 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1562 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1564 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1566 static char *typename_concat (struct obstack *obs, const char *prefix,
1567 const char *suffix, int physname,
1568 struct dwarf2_cu *cu);
1570 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1572 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1574 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1576 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1578 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1580 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1581 struct dwarf2_cu *, struct partial_symtab *);
1583 static int dwarf2_get_pc_bounds (struct die_info *,
1584 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1585 struct partial_symtab *);
1587 static void get_scope_pc_bounds (struct die_info *,
1588 CORE_ADDR *, CORE_ADDR *,
1589 struct dwarf2_cu *);
1591 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1592 CORE_ADDR, struct dwarf2_cu *);
1594 static void dwarf2_add_field (struct field_info *, struct die_info *,
1595 struct dwarf2_cu *);
1597 static void dwarf2_attach_fields_to_type (struct field_info *,
1598 struct type *, struct dwarf2_cu *);
1600 static void dwarf2_add_member_fn (struct field_info *,
1601 struct die_info *, struct type *,
1602 struct dwarf2_cu *);
1604 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1606 struct dwarf2_cu *);
1608 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1610 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1612 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1614 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1616 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1618 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1620 static struct type *read_module_type (struct die_info *die,
1621 struct dwarf2_cu *cu);
1623 static const char *namespace_name (struct die_info *die,
1624 int *is_anonymous, struct dwarf2_cu *);
1626 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1628 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1630 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1631 struct dwarf2_cu *);
1633 static struct die_info *read_die_and_siblings_1
1634 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1637 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1638 const gdb_byte *info_ptr,
1639 const gdb_byte **new_info_ptr,
1640 struct die_info *parent);
1642 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1643 struct die_info **, const gdb_byte *,
1646 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1647 struct die_info **, const gdb_byte *,
1650 static void process_die (struct die_info *, struct dwarf2_cu *);
1652 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1655 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1657 static const char *dwarf2_full_name (const char *name,
1658 struct die_info *die,
1659 struct dwarf2_cu *cu);
1661 static const char *dwarf2_physname (const char *name, struct die_info *die,
1662 struct dwarf2_cu *cu);
1664 static struct die_info *dwarf2_extension (struct die_info *die,
1665 struct dwarf2_cu **);
1667 static const char *dwarf_tag_name (unsigned int);
1669 static const char *dwarf_attr_name (unsigned int);
1671 static const char *dwarf_form_name (unsigned int);
1673 static char *dwarf_bool_name (unsigned int);
1675 static const char *dwarf_type_encoding_name (unsigned int);
1677 static struct die_info *sibling_die (struct die_info *);
1679 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1681 static void dump_die_for_error (struct die_info *);
1683 static void dump_die_1 (struct ui_file *, int level, int max_level,
1686 /*static*/ void dump_die (struct die_info *, int max_level);
1688 static void store_in_ref_table (struct die_info *,
1689 struct dwarf2_cu *);
1691 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1693 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1695 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1696 const struct attribute *,
1697 struct dwarf2_cu **);
1699 static struct die_info *follow_die_ref (struct die_info *,
1700 const struct attribute *,
1701 struct dwarf2_cu **);
1703 static struct die_info *follow_die_sig (struct die_info *,
1704 const struct attribute *,
1705 struct dwarf2_cu **);
1707 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1708 struct dwarf2_cu *);
1710 static struct type *get_DW_AT_signature_type (struct die_info *,
1711 const struct attribute *,
1712 struct dwarf2_cu *);
1714 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1716 static void read_signatured_type (struct signatured_type *);
1718 static struct type_unit_group *get_type_unit_group
1719 (struct dwarf2_cu *, const struct attribute *);
1721 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1723 /* memory allocation interface */
1725 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1727 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1729 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1732 static int attr_form_is_block (const struct attribute *);
1734 static int attr_form_is_section_offset (const struct attribute *);
1736 static int attr_form_is_constant (const struct attribute *);
1738 static int attr_form_is_ref (const struct attribute *);
1740 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1741 struct dwarf2_loclist_baton *baton,
1742 const struct attribute *attr);
1744 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1746 struct dwarf2_cu *cu,
1749 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1750 const gdb_byte *info_ptr,
1751 struct abbrev_info *abbrev);
1753 static void free_stack_comp_unit (void *);
1755 static hashval_t partial_die_hash (const void *item);
1757 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1759 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1760 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1762 static void init_one_comp_unit (struct dwarf2_cu *cu,
1763 struct dwarf2_per_cu_data *per_cu);
1765 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1766 struct die_info *comp_unit_die,
1767 enum language pretend_language);
1769 static void free_heap_comp_unit (void *);
1771 static void free_cached_comp_units (void *);
1773 static void age_cached_comp_units (void);
1775 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1777 static struct type *set_die_type (struct die_info *, struct type *,
1778 struct dwarf2_cu *);
1780 static void create_all_comp_units (struct objfile *);
1782 static int create_all_type_units (struct objfile *);
1784 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1787 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1790 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1793 static void dwarf2_add_dependence (struct dwarf2_cu *,
1794 struct dwarf2_per_cu_data *);
1796 static void dwarf2_mark (struct dwarf2_cu *);
1798 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1800 static struct type *get_die_type_at_offset (sect_offset,
1801 struct dwarf2_per_cu_data *);
1803 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1805 static void dwarf2_release_queue (void *dummy);
1807 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1808 enum language pretend_language);
1810 static void process_queue (void);
1812 static void find_file_and_directory (struct die_info *die,
1813 struct dwarf2_cu *cu,
1814 const char **name, const char **comp_dir);
1816 static char *file_full_name (int file, struct line_header *lh,
1817 const char *comp_dir);
1819 static const gdb_byte *read_and_check_comp_unit_head
1820 (struct comp_unit_head *header,
1821 struct dwarf2_section_info *section,
1822 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1823 int is_debug_types_section);
1825 static void init_cutu_and_read_dies
1826 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1827 int use_existing_cu, int keep,
1828 die_reader_func_ftype *die_reader_func, void *data);
1830 static void init_cutu_and_read_dies_simple
1831 (struct dwarf2_per_cu_data *this_cu,
1832 die_reader_func_ftype *die_reader_func, void *data);
1834 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1836 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1838 static struct dwo_unit *lookup_dwo_unit_in_dwp
1839 (struct dwp_file *dwp_file, const char *comp_dir,
1840 ULONGEST signature, int is_debug_types);
1842 static struct dwp_file *get_dwp_file (void);
1844 static struct dwo_unit *lookup_dwo_comp_unit
1845 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1847 static struct dwo_unit *lookup_dwo_type_unit
1848 (struct signatured_type *, const char *, const char *);
1850 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1852 static void free_dwo_file_cleanup (void *);
1854 static void process_cu_includes (void);
1856 static void check_producer (struct dwarf2_cu *cu);
1858 /* Various complaints about symbol reading that don't abort the process. */
1861 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1863 complaint (&symfile_complaints,
1864 _("statement list doesn't fit in .debug_line section"));
1868 dwarf2_debug_line_missing_file_complaint (void)
1870 complaint (&symfile_complaints,
1871 _(".debug_line section has line data without a file"));
1875 dwarf2_debug_line_missing_end_sequence_complaint (void)
1877 complaint (&symfile_complaints,
1878 _(".debug_line section has line "
1879 "program sequence without an end"));
1883 dwarf2_complex_location_expr_complaint (void)
1885 complaint (&symfile_complaints, _("location expression too complex"));
1889 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1892 complaint (&symfile_complaints,
1893 _("const value length mismatch for '%s', got %d, expected %d"),
1898 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1900 complaint (&symfile_complaints,
1901 _("debug info runs off end of %s section"
1903 get_section_name (section),
1904 get_section_file_name (section));
1908 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1910 complaint (&symfile_complaints,
1911 _("macro debug info contains a "
1912 "malformed macro definition:\n`%s'"),
1917 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1919 complaint (&symfile_complaints,
1920 _("invalid attribute class or form for '%s' in '%s'"),
1926 /* Convert VALUE between big- and little-endian. */
1928 byte_swap (offset_type value)
1932 result = (value & 0xff) << 24;
1933 result |= (value & 0xff00) << 8;
1934 result |= (value & 0xff0000) >> 8;
1935 result |= (value & 0xff000000) >> 24;
1939 #define MAYBE_SWAP(V) byte_swap (V)
1942 #define MAYBE_SWAP(V) (V)
1943 #endif /* WORDS_BIGENDIAN */
1945 /* Read the given attribute value as an address, taking the attribute's
1946 form into account. */
1949 attr_value_as_address (struct attribute *attr)
1953 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
1955 /* Aside from a few clearly defined exceptions, attributes that
1956 contain an address must always be in DW_FORM_addr form.
1957 Unfortunately, some compilers happen to be violating this
1958 requirement by encoding addresses using other forms, such
1959 as DW_FORM_data4 for example. For those broken compilers,
1960 we try to do our best, without any guarantee of success,
1961 to interpret the address correctly. It would also be nice
1962 to generate a complaint, but that would require us to maintain
1963 a list of legitimate cases where a non-address form is allowed,
1964 as well as update callers to pass in at least the CU's DWARF
1965 version. This is more overhead than what we're willing to
1966 expand for a pretty rare case. */
1967 addr = DW_UNSND (attr);
1970 addr = DW_ADDR (attr);
1975 /* The suffix for an index file. */
1976 #define INDEX_SUFFIX ".gdb-index"
1978 /* Try to locate the sections we need for DWARF 2 debugging
1979 information and return true if we have enough to do something.
1980 NAMES points to the dwarf2 section names, or is NULL if the standard
1981 ELF names are used. */
1984 dwarf2_has_info (struct objfile *objfile,
1985 const struct dwarf2_debug_sections *names)
1987 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1988 if (!dwarf2_per_objfile)
1990 /* Initialize per-objfile state. */
1991 struct dwarf2_per_objfile *data
1992 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1994 memset (data, 0, sizeof (*data));
1995 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1996 dwarf2_per_objfile = data;
1998 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
2000 dwarf2_per_objfile->objfile = objfile;
2002 return (!dwarf2_per_objfile->info.is_virtual
2003 && dwarf2_per_objfile->info.s.asection != NULL
2004 && !dwarf2_per_objfile->abbrev.is_virtual
2005 && dwarf2_per_objfile->abbrev.s.asection != NULL);
2008 /* Return the containing section of virtual section SECTION. */
2010 static struct dwarf2_section_info *
2011 get_containing_section (const struct dwarf2_section_info *section)
2013 gdb_assert (section->is_virtual);
2014 return section->s.containing_section;
2017 /* Return the bfd owner of SECTION. */
2020 get_section_bfd_owner (const struct dwarf2_section_info *section)
2022 if (section->is_virtual)
2024 section = get_containing_section (section);
2025 gdb_assert (!section->is_virtual);
2027 return section->s.asection->owner;
2030 /* Return the bfd section of SECTION.
2031 Returns NULL if the section is not present. */
2034 get_section_bfd_section (const struct dwarf2_section_info *section)
2036 if (section->is_virtual)
2038 section = get_containing_section (section);
2039 gdb_assert (!section->is_virtual);
2041 return section->s.asection;
2044 /* Return the name of SECTION. */
2047 get_section_name (const struct dwarf2_section_info *section)
2049 asection *sectp = get_section_bfd_section (section);
2051 gdb_assert (sectp != NULL);
2052 return bfd_section_name (get_section_bfd_owner (section), sectp);
2055 /* Return the name of the file SECTION is in. */
2058 get_section_file_name (const struct dwarf2_section_info *section)
2060 bfd *abfd = get_section_bfd_owner (section);
2062 return bfd_get_filename (abfd);
2065 /* Return the id of SECTION.
2066 Returns 0 if SECTION doesn't exist. */
2069 get_section_id (const struct dwarf2_section_info *section)
2071 asection *sectp = get_section_bfd_section (section);
2078 /* Return the flags of SECTION.
2079 SECTION (or containing section if this is a virtual section) must exist. */
2082 get_section_flags (const struct dwarf2_section_info *section)
2084 asection *sectp = get_section_bfd_section (section);
2086 gdb_assert (sectp != NULL);
2087 return bfd_get_section_flags (sectp->owner, sectp);
2090 /* When loading sections, we look either for uncompressed section or for
2091 compressed section names. */
2094 section_is_p (const char *section_name,
2095 const struct dwarf2_section_names *names)
2097 if (names->normal != NULL
2098 && strcmp (section_name, names->normal) == 0)
2100 if (names->compressed != NULL
2101 && strcmp (section_name, names->compressed) == 0)
2106 /* This function is mapped across the sections and remembers the
2107 offset and size of each of the debugging sections we are interested
2111 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
2113 const struct dwarf2_debug_sections *names;
2114 flagword aflag = bfd_get_section_flags (abfd, sectp);
2117 names = &dwarf2_elf_names;
2119 names = (const struct dwarf2_debug_sections *) vnames;
2121 if ((aflag & SEC_HAS_CONTENTS) == 0)
2124 else if (section_is_p (sectp->name, &names->info))
2126 dwarf2_per_objfile->info.s.asection = sectp;
2127 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
2129 else if (section_is_p (sectp->name, &names->abbrev))
2131 dwarf2_per_objfile->abbrev.s.asection = sectp;
2132 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
2134 else if (section_is_p (sectp->name, &names->line))
2136 dwarf2_per_objfile->line.s.asection = sectp;
2137 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
2139 else if (section_is_p (sectp->name, &names->loc))
2141 dwarf2_per_objfile->loc.s.asection = sectp;
2142 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
2144 else if (section_is_p (sectp->name, &names->macinfo))
2146 dwarf2_per_objfile->macinfo.s.asection = sectp;
2147 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
2149 else if (section_is_p (sectp->name, &names->macro))
2151 dwarf2_per_objfile->macro.s.asection = sectp;
2152 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
2154 else if (section_is_p (sectp->name, &names->str))
2156 dwarf2_per_objfile->str.s.asection = sectp;
2157 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
2159 else if (section_is_p (sectp->name, &names->addr))
2161 dwarf2_per_objfile->addr.s.asection = sectp;
2162 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
2164 else if (section_is_p (sectp->name, &names->frame))
2166 dwarf2_per_objfile->frame.s.asection = sectp;
2167 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
2169 else if (section_is_p (sectp->name, &names->eh_frame))
2171 dwarf2_per_objfile->eh_frame.s.asection = sectp;
2172 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
2174 else if (section_is_p (sectp->name, &names->ranges))
2176 dwarf2_per_objfile->ranges.s.asection = sectp;
2177 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
2179 else if (section_is_p (sectp->name, &names->types))
2181 struct dwarf2_section_info type_section;
2183 memset (&type_section, 0, sizeof (type_section));
2184 type_section.s.asection = sectp;
2185 type_section.size = bfd_get_section_size (sectp);
2187 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
2190 else if (section_is_p (sectp->name, &names->gdb_index))
2192 dwarf2_per_objfile->gdb_index.s.asection = sectp;
2193 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
2196 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
2197 && bfd_section_vma (abfd, sectp) == 0)
2198 dwarf2_per_objfile->has_section_at_zero = 1;
2201 /* A helper function that decides whether a section is empty,
2205 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2207 if (section->is_virtual)
2208 return section->size == 0;
2209 return section->s.asection == NULL || section->size == 0;
2212 /* Read the contents of the section INFO.
2213 OBJFILE is the main object file, but not necessarily the file where
2214 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2216 If the section is compressed, uncompress it before returning. */
2219 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2223 gdb_byte *buf, *retbuf;
2227 info->buffer = NULL;
2230 if (dwarf2_section_empty_p (info))
2233 sectp = get_section_bfd_section (info);
2235 /* If this is a virtual section we need to read in the real one first. */
2236 if (info->is_virtual)
2238 struct dwarf2_section_info *containing_section =
2239 get_containing_section (info);
2241 gdb_assert (sectp != NULL);
2242 if ((sectp->flags & SEC_RELOC) != 0)
2244 error (_("Dwarf Error: DWP format V2 with relocations is not"
2245 " supported in section %s [in module %s]"),
2246 get_section_name (info), get_section_file_name (info));
2248 dwarf2_read_section (objfile, containing_section);
2249 /* Other code should have already caught virtual sections that don't
2251 gdb_assert (info->virtual_offset + info->size
2252 <= containing_section->size);
2253 /* If the real section is empty or there was a problem reading the
2254 section we shouldn't get here. */
2255 gdb_assert (containing_section->buffer != NULL);
2256 info->buffer = containing_section->buffer + info->virtual_offset;
2260 /* If the section has relocations, we must read it ourselves.
2261 Otherwise we attach it to the BFD. */
2262 if ((sectp->flags & SEC_RELOC) == 0)
2264 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2268 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
2271 /* When debugging .o files, we may need to apply relocations; see
2272 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2273 We never compress sections in .o files, so we only need to
2274 try this when the section is not compressed. */
2275 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2278 info->buffer = retbuf;
2282 abfd = get_section_bfd_owner (info);
2283 gdb_assert (abfd != NULL);
2285 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2286 || bfd_bread (buf, info->size, abfd) != info->size)
2288 error (_("Dwarf Error: Can't read DWARF data"
2289 " in section %s [in module %s]"),
2290 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2294 /* A helper function that returns the size of a section in a safe way.
2295 If you are positive that the section has been read before using the
2296 size, then it is safe to refer to the dwarf2_section_info object's
2297 "size" field directly. In other cases, you must call this
2298 function, because for compressed sections the size field is not set
2299 correctly until the section has been read. */
2301 static bfd_size_type
2302 dwarf2_section_size (struct objfile *objfile,
2303 struct dwarf2_section_info *info)
2306 dwarf2_read_section (objfile, info);
2310 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2314 dwarf2_get_section_info (struct objfile *objfile,
2315 enum dwarf2_section_enum sect,
2316 asection **sectp, const gdb_byte **bufp,
2317 bfd_size_type *sizep)
2319 struct dwarf2_per_objfile *data
2320 = objfile_data (objfile, dwarf2_objfile_data_key);
2321 struct dwarf2_section_info *info;
2323 /* We may see an objfile without any DWARF, in which case we just
2334 case DWARF2_DEBUG_FRAME:
2335 info = &data->frame;
2337 case DWARF2_EH_FRAME:
2338 info = &data->eh_frame;
2341 gdb_assert_not_reached ("unexpected section");
2344 dwarf2_read_section (objfile, info);
2346 *sectp = get_section_bfd_section (info);
2347 *bufp = info->buffer;
2348 *sizep = info->size;
2351 /* A helper function to find the sections for a .dwz file. */
2354 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2356 struct dwz_file *dwz_file = arg;
2358 /* Note that we only support the standard ELF names, because .dwz
2359 is ELF-only (at the time of writing). */
2360 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2362 dwz_file->abbrev.s.asection = sectp;
2363 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2365 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2367 dwz_file->info.s.asection = sectp;
2368 dwz_file->info.size = bfd_get_section_size (sectp);
2370 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2372 dwz_file->str.s.asection = sectp;
2373 dwz_file->str.size = bfd_get_section_size (sectp);
2375 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2377 dwz_file->line.s.asection = sectp;
2378 dwz_file->line.size = bfd_get_section_size (sectp);
2380 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2382 dwz_file->macro.s.asection = sectp;
2383 dwz_file->macro.size = bfd_get_section_size (sectp);
2385 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2387 dwz_file->gdb_index.s.asection = sectp;
2388 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2392 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2393 there is no .gnu_debugaltlink section in the file. Error if there
2394 is such a section but the file cannot be found. */
2396 static struct dwz_file *
2397 dwarf2_get_dwz_file (void)
2401 struct cleanup *cleanup;
2402 const char *filename;
2403 struct dwz_file *result;
2404 bfd_size_type buildid_len_arg;
2408 if (dwarf2_per_objfile->dwz_file != NULL)
2409 return dwarf2_per_objfile->dwz_file;
2411 bfd_set_error (bfd_error_no_error);
2412 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2413 &buildid_len_arg, &buildid);
2416 if (bfd_get_error () == bfd_error_no_error)
2418 error (_("could not read '.gnu_debugaltlink' section: %s"),
2419 bfd_errmsg (bfd_get_error ()));
2421 cleanup = make_cleanup (xfree, data);
2422 make_cleanup (xfree, buildid);
2424 buildid_len = (size_t) buildid_len_arg;
2426 filename = (const char *) data;
2427 if (!IS_ABSOLUTE_PATH (filename))
2429 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2432 make_cleanup (xfree, abs);
2433 abs = ldirname (abs);
2434 make_cleanup (xfree, abs);
2436 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2437 make_cleanup (xfree, rel);
2441 /* First try the file name given in the section. If that doesn't
2442 work, try to use the build-id instead. */
2443 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2444 if (dwz_bfd != NULL)
2446 if (!build_id_verify (dwz_bfd, buildid_len, buildid))
2448 gdb_bfd_unref (dwz_bfd);
2453 if (dwz_bfd == NULL)
2454 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2456 if (dwz_bfd == NULL)
2457 error (_("could not find '.gnu_debugaltlink' file for %s"),
2458 objfile_name (dwarf2_per_objfile->objfile));
2460 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2462 result->dwz_bfd = dwz_bfd;
2464 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2466 do_cleanups (cleanup);
2468 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, dwz_bfd);
2469 dwarf2_per_objfile->dwz_file = result;
2473 /* DWARF quick_symbols_functions support. */
2475 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2476 unique line tables, so we maintain a separate table of all .debug_line
2477 derived entries to support the sharing.
2478 All the quick functions need is the list of file names. We discard the
2479 line_header when we're done and don't need to record it here. */
2480 struct quick_file_names
2482 /* The data used to construct the hash key. */
2483 struct stmt_list_hash hash;
2485 /* The number of entries in file_names, real_names. */
2486 unsigned int num_file_names;
2488 /* The file names from the line table, after being run through
2490 const char **file_names;
2492 /* The file names from the line table after being run through
2493 gdb_realpath. These are computed lazily. */
2494 const char **real_names;
2497 /* When using the index (and thus not using psymtabs), each CU has an
2498 object of this type. This is used to hold information needed by
2499 the various "quick" methods. */
2500 struct dwarf2_per_cu_quick_data
2502 /* The file table. This can be NULL if there was no file table
2503 or it's currently not read in.
2504 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2505 struct quick_file_names *file_names;
2507 /* The corresponding symbol table. This is NULL if symbols for this
2508 CU have not yet been read. */
2509 struct symtab *symtab;
2511 /* A temporary mark bit used when iterating over all CUs in
2512 expand_symtabs_matching. */
2513 unsigned int mark : 1;
2515 /* True if we've tried to read the file table and found there isn't one.
2516 There will be no point in trying to read it again next time. */
2517 unsigned int no_file_data : 1;
2520 /* Utility hash function for a stmt_list_hash. */
2523 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2527 if (stmt_list_hash->dwo_unit != NULL)
2528 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2529 v += stmt_list_hash->line_offset.sect_off;
2533 /* Utility equality function for a stmt_list_hash. */
2536 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2537 const struct stmt_list_hash *rhs)
2539 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2541 if (lhs->dwo_unit != NULL
2542 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2545 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2548 /* Hash function for a quick_file_names. */
2551 hash_file_name_entry (const void *e)
2553 const struct quick_file_names *file_data = e;
2555 return hash_stmt_list_entry (&file_data->hash);
2558 /* Equality function for a quick_file_names. */
2561 eq_file_name_entry (const void *a, const void *b)
2563 const struct quick_file_names *ea = a;
2564 const struct quick_file_names *eb = b;
2566 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2569 /* Delete function for a quick_file_names. */
2572 delete_file_name_entry (void *e)
2574 struct quick_file_names *file_data = e;
2577 for (i = 0; i < file_data->num_file_names; ++i)
2579 xfree ((void*) file_data->file_names[i]);
2580 if (file_data->real_names)
2581 xfree ((void*) file_data->real_names[i]);
2584 /* The space for the struct itself lives on objfile_obstack,
2585 so we don't free it here. */
2588 /* Create a quick_file_names hash table. */
2591 create_quick_file_names_table (unsigned int nr_initial_entries)
2593 return htab_create_alloc (nr_initial_entries,
2594 hash_file_name_entry, eq_file_name_entry,
2595 delete_file_name_entry, xcalloc, xfree);
2598 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2599 have to be created afterwards. You should call age_cached_comp_units after
2600 processing PER_CU->CU. dw2_setup must have been already called. */
2603 load_cu (struct dwarf2_per_cu_data *per_cu)
2605 if (per_cu->is_debug_types)
2606 load_full_type_unit (per_cu);
2608 load_full_comp_unit (per_cu, language_minimal);
2610 gdb_assert (per_cu->cu != NULL);
2612 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2615 /* Read in the symbols for PER_CU. */
2618 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2620 struct cleanup *back_to;
2622 /* Skip type_unit_groups, reading the type units they contain
2623 is handled elsewhere. */
2624 if (IS_TYPE_UNIT_GROUP (per_cu))
2627 back_to = make_cleanup (dwarf2_release_queue, NULL);
2629 if (dwarf2_per_objfile->using_index
2630 ? per_cu->v.quick->symtab == NULL
2631 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2633 queue_comp_unit (per_cu, language_minimal);
2636 /* If we just loaded a CU from a DWO, and we're working with an index
2637 that may badly handle TUs, load all the TUs in that DWO as well.
2638 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2639 if (!per_cu->is_debug_types
2640 && per_cu->cu->dwo_unit != NULL
2641 && dwarf2_per_objfile->index_table != NULL
2642 && dwarf2_per_objfile->index_table->version <= 7
2643 /* DWP files aren't supported yet. */
2644 && get_dwp_file () == NULL)
2645 queue_and_load_all_dwo_tus (per_cu);
2650 /* Age the cache, releasing compilation units that have not
2651 been used recently. */
2652 age_cached_comp_units ();
2654 do_cleanups (back_to);
2657 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2658 the objfile from which this CU came. Returns the resulting symbol
2661 static struct symtab *
2662 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2664 gdb_assert (dwarf2_per_objfile->using_index);
2665 if (!per_cu->v.quick->symtab)
2667 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2668 increment_reading_symtab ();
2669 dw2_do_instantiate_symtab (per_cu);
2670 process_cu_includes ();
2671 do_cleanups (back_to);
2673 return per_cu->v.quick->symtab;
2676 /* Return the CU given its index.
2678 This is intended for loops like:
2680 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2681 + dwarf2_per_objfile->n_type_units); ++i)
2683 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2689 static struct dwarf2_per_cu_data *
2690 dw2_get_cu (int index)
2692 if (index >= dwarf2_per_objfile->n_comp_units)
2694 index -= dwarf2_per_objfile->n_comp_units;
2695 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2696 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2699 return dwarf2_per_objfile->all_comp_units[index];
2702 /* Return the primary CU given its index.
2703 The difference between this function and dw2_get_cu is in the handling
2704 of type units (TUs). Here we return the type_unit_group object.
2706 This is intended for loops like:
2708 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2709 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2711 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2717 static struct dwarf2_per_cu_data *
2718 dw2_get_primary_cu (int index)
2720 if (index >= dwarf2_per_objfile->n_comp_units)
2722 index -= dwarf2_per_objfile->n_comp_units;
2723 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2724 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2727 return dwarf2_per_objfile->all_comp_units[index];
2730 /* A helper for create_cus_from_index that handles a given list of
2734 create_cus_from_index_list (struct objfile *objfile,
2735 const gdb_byte *cu_list, offset_type n_elements,
2736 struct dwarf2_section_info *section,
2742 for (i = 0; i < n_elements; i += 2)
2744 struct dwarf2_per_cu_data *the_cu;
2745 ULONGEST offset, length;
2747 gdb_static_assert (sizeof (ULONGEST) >= 8);
2748 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2749 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2752 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2753 struct dwarf2_per_cu_data);
2754 the_cu->offset.sect_off = offset;
2755 the_cu->length = length;
2756 the_cu->objfile = objfile;
2757 the_cu->section = section;
2758 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2759 struct dwarf2_per_cu_quick_data);
2760 the_cu->is_dwz = is_dwz;
2761 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2765 /* Read the CU list from the mapped index, and use it to create all
2766 the CU objects for this objfile. */
2769 create_cus_from_index (struct objfile *objfile,
2770 const gdb_byte *cu_list, offset_type cu_list_elements,
2771 const gdb_byte *dwz_list, offset_type dwz_elements)
2773 struct dwz_file *dwz;
2775 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2776 dwarf2_per_objfile->all_comp_units
2777 = obstack_alloc (&objfile->objfile_obstack,
2778 dwarf2_per_objfile->n_comp_units
2779 * sizeof (struct dwarf2_per_cu_data *));
2781 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2782 &dwarf2_per_objfile->info, 0, 0);
2784 if (dwz_elements == 0)
2787 dwz = dwarf2_get_dwz_file ();
2788 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2789 cu_list_elements / 2);
2792 /* Create the signatured type hash table from the index. */
2795 create_signatured_type_table_from_index (struct objfile *objfile,
2796 struct dwarf2_section_info *section,
2797 const gdb_byte *bytes,
2798 offset_type elements)
2801 htab_t sig_types_hash;
2803 dwarf2_per_objfile->n_type_units = elements / 3;
2804 dwarf2_per_objfile->all_type_units
2805 = xmalloc (dwarf2_per_objfile->n_type_units
2806 * sizeof (struct signatured_type *));
2808 sig_types_hash = allocate_signatured_type_table (objfile);
2810 for (i = 0; i < elements; i += 3)
2812 struct signatured_type *sig_type;
2813 ULONGEST offset, type_offset_in_tu, signature;
2816 gdb_static_assert (sizeof (ULONGEST) >= 8);
2817 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2818 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2820 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2823 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2824 struct signatured_type);
2825 sig_type->signature = signature;
2826 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2827 sig_type->per_cu.is_debug_types = 1;
2828 sig_type->per_cu.section = section;
2829 sig_type->per_cu.offset.sect_off = offset;
2830 sig_type->per_cu.objfile = objfile;
2831 sig_type->per_cu.v.quick
2832 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2833 struct dwarf2_per_cu_quick_data);
2835 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2838 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2841 dwarf2_per_objfile->signatured_types = sig_types_hash;
2844 /* Read the address map data from the mapped index, and use it to
2845 populate the objfile's psymtabs_addrmap. */
2848 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2850 const gdb_byte *iter, *end;
2851 struct obstack temp_obstack;
2852 struct addrmap *mutable_map;
2853 struct cleanup *cleanup;
2856 obstack_init (&temp_obstack);
2857 cleanup = make_cleanup_obstack_free (&temp_obstack);
2858 mutable_map = addrmap_create_mutable (&temp_obstack);
2860 iter = index->address_table;
2861 end = iter + index->address_table_size;
2863 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2867 ULONGEST hi, lo, cu_index;
2868 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2870 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2872 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2877 complaint (&symfile_complaints,
2878 _(".gdb_index address table has invalid range (%s - %s)"),
2879 hex_string (lo), hex_string (hi));
2883 if (cu_index >= dwarf2_per_objfile->n_comp_units)
2885 complaint (&symfile_complaints,
2886 _(".gdb_index address table has invalid CU number %u"),
2887 (unsigned) cu_index);
2891 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2892 dw2_get_cu (cu_index));
2895 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2896 &objfile->objfile_obstack);
2897 do_cleanups (cleanup);
2900 /* The hash function for strings in the mapped index. This is the same as
2901 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2902 implementation. This is necessary because the hash function is tied to the
2903 format of the mapped index file. The hash values do not have to match with
2906 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2909 mapped_index_string_hash (int index_version, const void *p)
2911 const unsigned char *str = (const unsigned char *) p;
2915 while ((c = *str++) != 0)
2917 if (index_version >= 5)
2919 r = r * 67 + c - 113;
2925 /* Find a slot in the mapped index INDEX for the object named NAME.
2926 If NAME is found, set *VEC_OUT to point to the CU vector in the
2927 constant pool and return 1. If NAME cannot be found, return 0. */
2930 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2931 offset_type **vec_out)
2933 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2935 offset_type slot, step;
2936 int (*cmp) (const char *, const char *);
2938 if (current_language->la_language == language_cplus
2939 || current_language->la_language == language_java
2940 || current_language->la_language == language_fortran)
2942 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2944 const char *paren = strchr (name, '(');
2950 dup = xmalloc (paren - name + 1);
2951 memcpy (dup, name, paren - name);
2952 dup[paren - name] = 0;
2954 make_cleanup (xfree, dup);
2959 /* Index version 4 did not support case insensitive searches. But the
2960 indices for case insensitive languages are built in lowercase, therefore
2961 simulate our NAME being searched is also lowercased. */
2962 hash = mapped_index_string_hash ((index->version == 4
2963 && case_sensitivity == case_sensitive_off
2964 ? 5 : index->version),
2967 slot = hash & (index->symbol_table_slots - 1);
2968 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2969 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2973 /* Convert a slot number to an offset into the table. */
2974 offset_type i = 2 * slot;
2976 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2978 do_cleanups (back_to);
2982 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2983 if (!cmp (name, str))
2985 *vec_out = (offset_type *) (index->constant_pool
2986 + MAYBE_SWAP (index->symbol_table[i + 1]));
2987 do_cleanups (back_to);
2991 slot = (slot + step) & (index->symbol_table_slots - 1);
2995 /* A helper function that reads the .gdb_index from SECTION and fills
2996 in MAP. FILENAME is the name of the file containing the section;
2997 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2998 ok to use deprecated sections.
3000 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3001 out parameters that are filled in with information about the CU and
3002 TU lists in the section.
3004 Returns 1 if all went well, 0 otherwise. */
3007 read_index_from_section (struct objfile *objfile,
3008 const char *filename,
3010 struct dwarf2_section_info *section,
3011 struct mapped_index *map,
3012 const gdb_byte **cu_list,
3013 offset_type *cu_list_elements,
3014 const gdb_byte **types_list,
3015 offset_type *types_list_elements)
3017 const gdb_byte *addr;
3018 offset_type version;
3019 offset_type *metadata;
3022 if (dwarf2_section_empty_p (section))
3025 /* Older elfutils strip versions could keep the section in the main
3026 executable while splitting it for the separate debug info file. */
3027 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3030 dwarf2_read_section (objfile, section);
3032 addr = section->buffer;
3033 /* Version check. */
3034 version = MAYBE_SWAP (*(offset_type *) addr);
3035 /* Versions earlier than 3 emitted every copy of a psymbol. This
3036 causes the index to behave very poorly for certain requests. Version 3
3037 contained incomplete addrmap. So, it seems better to just ignore such
3041 static int warning_printed = 0;
3042 if (!warning_printed)
3044 warning (_("Skipping obsolete .gdb_index section in %s."),
3046 warning_printed = 1;
3050 /* Index version 4 uses a different hash function than index version
3053 Versions earlier than 6 did not emit psymbols for inlined
3054 functions. Using these files will cause GDB not to be able to
3055 set breakpoints on inlined functions by name, so we ignore these
3056 indices unless the user has done
3057 "set use-deprecated-index-sections on". */
3058 if (version < 6 && !deprecated_ok)
3060 static int warning_printed = 0;
3061 if (!warning_printed)
3064 Skipping deprecated .gdb_index section in %s.\n\
3065 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3066 to use the section anyway."),
3068 warning_printed = 1;
3072 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3073 of the TU (for symbols coming from TUs),
3074 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3075 Plus gold-generated indices can have duplicate entries for global symbols,
3076 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3077 These are just performance bugs, and we can't distinguish gdb-generated
3078 indices from gold-generated ones, so issue no warning here. */
3080 /* Indexes with higher version than the one supported by GDB may be no
3081 longer backward compatible. */
3085 map->version = version;
3086 map->total_size = section->size;
3088 metadata = (offset_type *) (addr + sizeof (offset_type));
3091 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3092 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3096 *types_list = addr + MAYBE_SWAP (metadata[i]);
3097 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3098 - MAYBE_SWAP (metadata[i]))
3102 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3103 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3104 - MAYBE_SWAP (metadata[i]));
3107 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3108 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3109 - MAYBE_SWAP (metadata[i]))
3110 / (2 * sizeof (offset_type)));
3113 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3119 /* Read the index file. If everything went ok, initialize the "quick"
3120 elements of all the CUs and return 1. Otherwise, return 0. */
3123 dwarf2_read_index (struct objfile *objfile)
3125 struct mapped_index local_map, *map;
3126 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3127 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3128 struct dwz_file *dwz;
3130 if (!read_index_from_section (objfile, objfile_name (objfile),
3131 use_deprecated_index_sections,
3132 &dwarf2_per_objfile->gdb_index, &local_map,
3133 &cu_list, &cu_list_elements,
3134 &types_list, &types_list_elements))
3137 /* Don't use the index if it's empty. */
3138 if (local_map.symbol_table_slots == 0)
3141 /* If there is a .dwz file, read it so we can get its CU list as
3143 dwz = dwarf2_get_dwz_file ();
3146 struct mapped_index dwz_map;
3147 const gdb_byte *dwz_types_ignore;
3148 offset_type dwz_types_elements_ignore;
3150 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3152 &dwz->gdb_index, &dwz_map,
3153 &dwz_list, &dwz_list_elements,
3155 &dwz_types_elements_ignore))
3157 warning (_("could not read '.gdb_index' section from %s; skipping"),
3158 bfd_get_filename (dwz->dwz_bfd));
3163 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3166 if (types_list_elements)
3168 struct dwarf2_section_info *section;
3170 /* We can only handle a single .debug_types when we have an
3172 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3175 section = VEC_index (dwarf2_section_info_def,
3176 dwarf2_per_objfile->types, 0);
3178 create_signatured_type_table_from_index (objfile, section, types_list,
3179 types_list_elements);
3182 create_addrmap_from_index (objfile, &local_map);
3184 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
3187 dwarf2_per_objfile->index_table = map;
3188 dwarf2_per_objfile->using_index = 1;
3189 dwarf2_per_objfile->quick_file_names_table =
3190 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3195 /* A helper for the "quick" functions which sets the global
3196 dwarf2_per_objfile according to OBJFILE. */
3199 dw2_setup (struct objfile *objfile)
3201 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
3202 gdb_assert (dwarf2_per_objfile);
3205 /* die_reader_func for dw2_get_file_names. */
3208 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3209 const gdb_byte *info_ptr,
3210 struct die_info *comp_unit_die,
3214 struct dwarf2_cu *cu = reader->cu;
3215 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3216 struct objfile *objfile = dwarf2_per_objfile->objfile;
3217 struct dwarf2_per_cu_data *lh_cu;
3218 struct line_header *lh;
3219 struct attribute *attr;
3221 const char *name, *comp_dir;
3223 struct quick_file_names *qfn;
3224 unsigned int line_offset;
3226 gdb_assert (! this_cu->is_debug_types);
3228 /* Our callers never want to match partial units -- instead they
3229 will match the enclosing full CU. */
3230 if (comp_unit_die->tag == DW_TAG_partial_unit)
3232 this_cu->v.quick->no_file_data = 1;
3241 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3244 struct quick_file_names find_entry;
3246 line_offset = DW_UNSND (attr);
3248 /* We may have already read in this line header (TU line header sharing).
3249 If we have we're done. */
3250 find_entry.hash.dwo_unit = cu->dwo_unit;
3251 find_entry.hash.line_offset.sect_off = line_offset;
3252 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3253 &find_entry, INSERT);
3256 lh_cu->v.quick->file_names = *slot;
3260 lh = dwarf_decode_line_header (line_offset, cu);
3264 lh_cu->v.quick->no_file_data = 1;
3268 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
3269 qfn->hash.dwo_unit = cu->dwo_unit;
3270 qfn->hash.line_offset.sect_off = line_offset;
3271 gdb_assert (slot != NULL);
3274 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
3276 qfn->num_file_names = lh->num_file_names;
3277 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
3278 lh->num_file_names * sizeof (char *));
3279 for (i = 0; i < lh->num_file_names; ++i)
3280 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
3281 qfn->real_names = NULL;
3283 free_line_header (lh);
3285 lh_cu->v.quick->file_names = qfn;
3288 /* A helper for the "quick" functions which attempts to read the line
3289 table for THIS_CU. */
3291 static struct quick_file_names *
3292 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3294 /* This should never be called for TUs. */
3295 gdb_assert (! this_cu->is_debug_types);
3296 /* Nor type unit groups. */
3297 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3299 if (this_cu->v.quick->file_names != NULL)
3300 return this_cu->v.quick->file_names;
3301 /* If we know there is no line data, no point in looking again. */
3302 if (this_cu->v.quick->no_file_data)
3305 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3307 if (this_cu->v.quick->no_file_data)
3309 return this_cu->v.quick->file_names;
3312 /* A helper for the "quick" functions which computes and caches the
3313 real path for a given file name from the line table. */
3316 dw2_get_real_path (struct objfile *objfile,
3317 struct quick_file_names *qfn, int index)
3319 if (qfn->real_names == NULL)
3320 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3321 qfn->num_file_names, char *);
3323 if (qfn->real_names[index] == NULL)
3324 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3326 return qfn->real_names[index];
3329 static struct symtab *
3330 dw2_find_last_source_symtab (struct objfile *objfile)
3334 dw2_setup (objfile);
3335 index = dwarf2_per_objfile->n_comp_units - 1;
3336 return dw2_instantiate_symtab (dw2_get_cu (index));
3339 /* Traversal function for dw2_forget_cached_source_info. */
3342 dw2_free_cached_file_names (void **slot, void *info)
3344 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3346 if (file_data->real_names)
3350 for (i = 0; i < file_data->num_file_names; ++i)
3352 xfree ((void*) file_data->real_names[i]);
3353 file_data->real_names[i] = NULL;
3361 dw2_forget_cached_source_info (struct objfile *objfile)
3363 dw2_setup (objfile);
3365 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3366 dw2_free_cached_file_names, NULL);
3369 /* Helper function for dw2_map_symtabs_matching_filename that expands
3370 the symtabs and calls the iterator. */
3373 dw2_map_expand_apply (struct objfile *objfile,
3374 struct dwarf2_per_cu_data *per_cu,
3375 const char *name, const char *real_path,
3376 int (*callback) (struct symtab *, void *),
3379 struct symtab *last_made = objfile->symtabs;
3381 /* Don't visit already-expanded CUs. */
3382 if (per_cu->v.quick->symtab)
3385 /* This may expand more than one symtab, and we want to iterate over
3387 dw2_instantiate_symtab (per_cu);
3389 return iterate_over_some_symtabs (name, real_path, callback, data,
3390 objfile->symtabs, last_made);
3393 /* Implementation of the map_symtabs_matching_filename method. */
3396 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3397 const char *real_path,
3398 int (*callback) (struct symtab *, void *),
3402 const char *name_basename = lbasename (name);
3404 dw2_setup (objfile);
3406 /* The rule is CUs specify all the files, including those used by
3407 any TU, so there's no need to scan TUs here. */
3409 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3412 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3413 struct quick_file_names *file_data;
3415 /* We only need to look at symtabs not already expanded. */
3416 if (per_cu->v.quick->symtab)
3419 file_data = dw2_get_file_names (per_cu);
3420 if (file_data == NULL)
3423 for (j = 0; j < file_data->num_file_names; ++j)
3425 const char *this_name = file_data->file_names[j];
3426 const char *this_real_name;
3428 if (compare_filenames_for_search (this_name, name))
3430 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3436 /* Before we invoke realpath, which can get expensive when many
3437 files are involved, do a quick comparison of the basenames. */
3438 if (! basenames_may_differ
3439 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3442 this_real_name = dw2_get_real_path (objfile, file_data, j);
3443 if (compare_filenames_for_search (this_real_name, name))
3445 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3451 if (real_path != NULL)
3453 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3454 gdb_assert (IS_ABSOLUTE_PATH (name));
3455 if (this_real_name != NULL
3456 && FILENAME_CMP (real_path, this_real_name) == 0)
3458 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3470 /* Struct used to manage iterating over all CUs looking for a symbol. */
3472 struct dw2_symtab_iterator
3474 /* The internalized form of .gdb_index. */
3475 struct mapped_index *index;
3476 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3477 int want_specific_block;
3478 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3479 Unused if !WANT_SPECIFIC_BLOCK. */
3481 /* The kind of symbol we're looking for. */
3483 /* The list of CUs from the index entry of the symbol,
3484 or NULL if not found. */
3486 /* The next element in VEC to look at. */
3488 /* The number of elements in VEC, or zero if there is no match. */
3490 /* Have we seen a global version of the symbol?
3491 If so we can ignore all further global instances.
3492 This is to work around gold/15646, inefficient gold-generated
3497 /* Initialize the index symtab iterator ITER.
3498 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3499 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3502 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3503 struct mapped_index *index,
3504 int want_specific_block,
3509 iter->index = index;
3510 iter->want_specific_block = want_specific_block;
3511 iter->block_index = block_index;
3512 iter->domain = domain;
3514 iter->global_seen = 0;
3516 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3517 iter->length = MAYBE_SWAP (*iter->vec);
3525 /* Return the next matching CU or NULL if there are no more. */
3527 static struct dwarf2_per_cu_data *
3528 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3530 for ( ; iter->next < iter->length; ++iter->next)
3532 offset_type cu_index_and_attrs =
3533 MAYBE_SWAP (iter->vec[iter->next + 1]);
3534 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3535 struct dwarf2_per_cu_data *per_cu;
3536 int want_static = iter->block_index != GLOBAL_BLOCK;
3537 /* This value is only valid for index versions >= 7. */
3538 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3539 gdb_index_symbol_kind symbol_kind =
3540 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3541 /* Only check the symbol attributes if they're present.
3542 Indices prior to version 7 don't record them,
3543 and indices >= 7 may elide them for certain symbols
3544 (gold does this). */
3546 (iter->index->version >= 7
3547 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3549 /* Don't crash on bad data. */
3550 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3551 + dwarf2_per_objfile->n_type_units))
3553 complaint (&symfile_complaints,
3554 _(".gdb_index entry has bad CU index"
3556 objfile_name (dwarf2_per_objfile->objfile));
3560 per_cu = dw2_get_cu (cu_index);
3562 /* Skip if already read in. */
3563 if (per_cu->v.quick->symtab)
3566 /* Check static vs global. */
3569 if (iter->want_specific_block
3570 && want_static != is_static)
3572 /* Work around gold/15646. */
3573 if (!is_static && iter->global_seen)
3576 iter->global_seen = 1;
3579 /* Only check the symbol's kind if it has one. */
3582 switch (iter->domain)
3585 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3586 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3587 /* Some types are also in VAR_DOMAIN. */
3588 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3592 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3596 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3611 static struct symtab *
3612 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3613 const char *name, domain_enum domain)
3615 struct symtab *stab_best = NULL;
3616 struct mapped_index *index;
3618 dw2_setup (objfile);
3620 index = dwarf2_per_objfile->index_table;
3622 /* index is NULL if OBJF_READNOW. */
3625 struct dw2_symtab_iterator iter;
3626 struct dwarf2_per_cu_data *per_cu;
3628 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3630 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3632 struct symbol *sym = NULL;
3633 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3635 /* Some caution must be observed with overloaded functions
3636 and methods, since the index will not contain any overload
3637 information (but NAME might contain it). */
3640 struct blockvector *bv = BLOCKVECTOR (stab);
3641 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3643 sym = lookup_block_symbol (block, name, domain);
3646 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3648 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3654 /* Keep looking through other CUs. */
3662 dw2_print_stats (struct objfile *objfile)
3664 int i, total, count;
3666 dw2_setup (objfile);
3667 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3669 for (i = 0; i < total; ++i)
3671 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3673 if (!per_cu->v.quick->symtab)
3676 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3677 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3680 /* This dumps minimal information about the index.
3681 It is called via "mt print objfiles".
3682 One use is to verify .gdb_index has been loaded by the
3683 gdb.dwarf2/gdb-index.exp testcase. */
3686 dw2_dump (struct objfile *objfile)
3688 dw2_setup (objfile);
3689 gdb_assert (dwarf2_per_objfile->using_index);
3690 printf_filtered (".gdb_index:");
3691 if (dwarf2_per_objfile->index_table != NULL)
3693 printf_filtered (" version %d\n",
3694 dwarf2_per_objfile->index_table->version);
3697 printf_filtered (" faked for \"readnow\"\n");
3698 printf_filtered ("\n");
3702 dw2_relocate (struct objfile *objfile,
3703 const struct section_offsets *new_offsets,
3704 const struct section_offsets *delta)
3706 /* There's nothing to relocate here. */
3710 dw2_expand_symtabs_for_function (struct objfile *objfile,
3711 const char *func_name)
3713 struct mapped_index *index;
3715 dw2_setup (objfile);
3717 index = dwarf2_per_objfile->index_table;
3719 /* index is NULL if OBJF_READNOW. */
3722 struct dw2_symtab_iterator iter;
3723 struct dwarf2_per_cu_data *per_cu;
3725 /* Note: It doesn't matter what we pass for block_index here. */
3726 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3729 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3730 dw2_instantiate_symtab (per_cu);
3735 dw2_expand_all_symtabs (struct objfile *objfile)
3739 dw2_setup (objfile);
3741 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3742 + dwarf2_per_objfile->n_type_units); ++i)
3744 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3746 dw2_instantiate_symtab (per_cu);
3751 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3752 const char *fullname)
3756 dw2_setup (objfile);
3758 /* We don't need to consider type units here.
3759 This is only called for examining code, e.g. expand_line_sal.
3760 There can be an order of magnitude (or more) more type units
3761 than comp units, and we avoid them if we can. */
3763 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3766 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3767 struct quick_file_names *file_data;
3769 /* We only need to look at symtabs not already expanded. */
3770 if (per_cu->v.quick->symtab)
3773 file_data = dw2_get_file_names (per_cu);
3774 if (file_data == NULL)
3777 for (j = 0; j < file_data->num_file_names; ++j)
3779 const char *this_fullname = file_data->file_names[j];
3781 if (filename_cmp (this_fullname, fullname) == 0)
3783 dw2_instantiate_symtab (per_cu);
3791 dw2_map_matching_symbols (struct objfile *objfile,
3792 const char * name, domain_enum namespace,
3794 int (*callback) (struct block *,
3795 struct symbol *, void *),
3796 void *data, symbol_compare_ftype *match,
3797 symbol_compare_ftype *ordered_compare)
3799 /* Currently unimplemented; used for Ada. The function can be called if the
3800 current language is Ada for a non-Ada objfile using GNU index. As Ada
3801 does not look for non-Ada symbols this function should just return. */
3805 dw2_expand_symtabs_matching
3806 (struct objfile *objfile,
3807 expand_symtabs_file_matcher_ftype *file_matcher,
3808 expand_symtabs_symbol_matcher_ftype *symbol_matcher,
3809 enum search_domain kind,
3814 struct mapped_index *index;
3816 dw2_setup (objfile);
3818 /* index_table is NULL if OBJF_READNOW. */
3819 if (!dwarf2_per_objfile->index_table)
3821 index = dwarf2_per_objfile->index_table;
3823 if (file_matcher != NULL)
3825 struct cleanup *cleanup;
3826 htab_t visited_found, visited_not_found;
3828 visited_found = htab_create_alloc (10,
3829 htab_hash_pointer, htab_eq_pointer,
3830 NULL, xcalloc, xfree);
3831 cleanup = make_cleanup_htab_delete (visited_found);
3832 visited_not_found = htab_create_alloc (10,
3833 htab_hash_pointer, htab_eq_pointer,
3834 NULL, xcalloc, xfree);
3835 make_cleanup_htab_delete (visited_not_found);
3837 /* The rule is CUs specify all the files, including those used by
3838 any TU, so there's no need to scan TUs here. */
3840 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3843 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3844 struct quick_file_names *file_data;
3847 per_cu->v.quick->mark = 0;
3849 /* We only need to look at symtabs not already expanded. */
3850 if (per_cu->v.quick->symtab)
3853 file_data = dw2_get_file_names (per_cu);
3854 if (file_data == NULL)
3857 if (htab_find (visited_not_found, file_data) != NULL)
3859 else if (htab_find (visited_found, file_data) != NULL)
3861 per_cu->v.quick->mark = 1;
3865 for (j = 0; j < file_data->num_file_names; ++j)
3867 const char *this_real_name;
3869 if (file_matcher (file_data->file_names[j], data, 0))
3871 per_cu->v.quick->mark = 1;
3875 /* Before we invoke realpath, which can get expensive when many
3876 files are involved, do a quick comparison of the basenames. */
3877 if (!basenames_may_differ
3878 && !file_matcher (lbasename (file_data->file_names[j]),
3882 this_real_name = dw2_get_real_path (objfile, file_data, j);
3883 if (file_matcher (this_real_name, data, 0))
3885 per_cu->v.quick->mark = 1;
3890 slot = htab_find_slot (per_cu->v.quick->mark
3892 : visited_not_found,
3897 do_cleanups (cleanup);
3900 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3902 offset_type idx = 2 * iter;
3904 offset_type *vec, vec_len, vec_idx;
3905 int global_seen = 0;
3907 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3910 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3912 if (! (*symbol_matcher) (name, data))
3915 /* The name was matched, now expand corresponding CUs that were
3917 vec = (offset_type *) (index->constant_pool
3918 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3919 vec_len = MAYBE_SWAP (vec[0]);
3920 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3922 struct dwarf2_per_cu_data *per_cu;
3923 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3924 /* This value is only valid for index versions >= 7. */
3925 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3926 gdb_index_symbol_kind symbol_kind =
3927 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3928 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3929 /* Only check the symbol attributes if they're present.
3930 Indices prior to version 7 don't record them,
3931 and indices >= 7 may elide them for certain symbols
3932 (gold does this). */
3934 (index->version >= 7
3935 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3937 /* Work around gold/15646. */
3940 if (!is_static && global_seen)
3946 /* Only check the symbol's kind if it has one. */
3951 case VARIABLES_DOMAIN:
3952 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3955 case FUNCTIONS_DOMAIN:
3956 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3960 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3968 /* Don't crash on bad data. */
3969 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3970 + dwarf2_per_objfile->n_type_units))
3972 complaint (&symfile_complaints,
3973 _(".gdb_index entry has bad CU index"
3974 " [in module %s]"), objfile_name (objfile));
3978 per_cu = dw2_get_cu (cu_index);
3979 if (file_matcher == NULL || per_cu->v.quick->mark)
3980 dw2_instantiate_symtab (per_cu);
3985 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3988 static struct symtab *
3989 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3993 if (BLOCKVECTOR (symtab) != NULL
3994 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3997 if (symtab->includes == NULL)
4000 for (i = 0; symtab->includes[i]; ++i)
4002 struct symtab *s = symtab->includes[i];
4004 s = recursively_find_pc_sect_symtab (s, pc);
4012 static struct symtab *
4013 dw2_find_pc_sect_symtab (struct objfile *objfile,
4014 struct bound_minimal_symbol msymbol,
4016 struct obj_section *section,
4019 struct dwarf2_per_cu_data *data;
4020 struct symtab *result;
4022 dw2_setup (objfile);
4024 if (!objfile->psymtabs_addrmap)
4027 data = addrmap_find (objfile->psymtabs_addrmap, pc);
4031 if (warn_if_readin && data->v.quick->symtab)
4032 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4033 paddress (get_objfile_arch (objfile), pc));
4035 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
4036 gdb_assert (result != NULL);
4041 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4042 void *data, int need_fullname)
4045 struct cleanup *cleanup;
4046 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
4047 NULL, xcalloc, xfree);
4049 cleanup = make_cleanup_htab_delete (visited);
4050 dw2_setup (objfile);
4052 /* The rule is CUs specify all the files, including those used by
4053 any TU, so there's no need to scan TUs here.
4054 We can ignore file names coming from already-expanded CUs. */
4056 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4058 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4060 if (per_cu->v.quick->symtab)
4062 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
4065 *slot = per_cu->v.quick->file_names;
4069 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4072 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
4073 struct quick_file_names *file_data;
4076 /* We only need to look at symtabs not already expanded. */
4077 if (per_cu->v.quick->symtab)
4080 file_data = dw2_get_file_names (per_cu);
4081 if (file_data == NULL)
4084 slot = htab_find_slot (visited, file_data, INSERT);
4087 /* Already visited. */
4092 for (j = 0; j < file_data->num_file_names; ++j)
4094 const char *this_real_name;
4097 this_real_name = dw2_get_real_path (objfile, file_data, j);
4099 this_real_name = NULL;
4100 (*fun) (file_data->file_names[j], this_real_name, data);
4104 do_cleanups (cleanup);
4108 dw2_has_symbols (struct objfile *objfile)
4113 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4116 dw2_find_last_source_symtab,
4117 dw2_forget_cached_source_info,
4118 dw2_map_symtabs_matching_filename,
4123 dw2_expand_symtabs_for_function,
4124 dw2_expand_all_symtabs,
4125 dw2_expand_symtabs_with_fullname,
4126 dw2_map_matching_symbols,
4127 dw2_expand_symtabs_matching,
4128 dw2_find_pc_sect_symtab,
4129 dw2_map_symbol_filenames
4132 /* Initialize for reading DWARF for this objfile. Return 0 if this
4133 file will use psymtabs, or 1 if using the GNU index. */
4136 dwarf2_initialize_objfile (struct objfile *objfile)
4138 /* If we're about to read full symbols, don't bother with the
4139 indices. In this case we also don't care if some other debug
4140 format is making psymtabs, because they are all about to be
4142 if ((objfile->flags & OBJF_READNOW))
4146 dwarf2_per_objfile->using_index = 1;
4147 create_all_comp_units (objfile);
4148 create_all_type_units (objfile);
4149 dwarf2_per_objfile->quick_file_names_table =
4150 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4152 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4153 + dwarf2_per_objfile->n_type_units); ++i)
4155 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4157 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4158 struct dwarf2_per_cu_quick_data);
4161 /* Return 1 so that gdb sees the "quick" functions. However,
4162 these functions will be no-ops because we will have expanded
4167 if (dwarf2_read_index (objfile))
4175 /* Build a partial symbol table. */
4178 dwarf2_build_psymtabs (struct objfile *objfile)
4180 volatile struct gdb_exception except;
4182 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4184 init_psymbol_list (objfile, 1024);
4187 TRY_CATCH (except, RETURN_MASK_ERROR)
4189 /* This isn't really ideal: all the data we allocate on the
4190 objfile's obstack is still uselessly kept around. However,
4191 freeing it seems unsafe. */
4192 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
4194 dwarf2_build_psymtabs_hard (objfile);
4195 discard_cleanups (cleanups);
4197 if (except.reason < 0)
4198 exception_print (gdb_stderr, except);
4201 /* Return the total length of the CU described by HEADER. */
4204 get_cu_length (const struct comp_unit_head *header)
4206 return header->initial_length_size + header->length;
4209 /* Return TRUE if OFFSET is within CU_HEADER. */
4212 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
4214 sect_offset bottom = { cu_header->offset.sect_off };
4215 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
4217 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
4220 /* Find the base address of the compilation unit for range lists and
4221 location lists. It will normally be specified by DW_AT_low_pc.
4222 In DWARF-3 draft 4, the base address could be overridden by
4223 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4224 compilation units with discontinuous ranges. */
4227 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4229 struct attribute *attr;
4232 cu->base_address = 0;
4234 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4237 cu->base_address = attr_value_as_address (attr);
4242 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4245 cu->base_address = attr_value_as_address (attr);
4251 /* Read in the comp unit header information from the debug_info at info_ptr.
4252 NOTE: This leaves members offset, first_die_offset to be filled in
4255 static const gdb_byte *
4256 read_comp_unit_head (struct comp_unit_head *cu_header,
4257 const gdb_byte *info_ptr, bfd *abfd)
4260 unsigned int bytes_read;
4262 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4263 cu_header->initial_length_size = bytes_read;
4264 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4265 info_ptr += bytes_read;
4266 cu_header->version = read_2_bytes (abfd, info_ptr);
4268 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
4270 info_ptr += bytes_read;
4271 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4273 signed_addr = bfd_get_sign_extend_vma (abfd);
4274 if (signed_addr < 0)
4275 internal_error (__FILE__, __LINE__,
4276 _("read_comp_unit_head: dwarf from non elf file"));
4277 cu_header->signed_addr_p = signed_addr;
4282 /* Helper function that returns the proper abbrev section for
4285 static struct dwarf2_section_info *
4286 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4288 struct dwarf2_section_info *abbrev;
4290 if (this_cu->is_dwz)
4291 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4293 abbrev = &dwarf2_per_objfile->abbrev;
4298 /* Subroutine of read_and_check_comp_unit_head and
4299 read_and_check_type_unit_head to simplify them.
4300 Perform various error checking on the header. */
4303 error_check_comp_unit_head (struct comp_unit_head *header,
4304 struct dwarf2_section_info *section,
4305 struct dwarf2_section_info *abbrev_section)
4307 bfd *abfd = get_section_bfd_owner (section);
4308 const char *filename = get_section_file_name (section);
4310 if (header->version != 2 && header->version != 3 && header->version != 4)
4311 error (_("Dwarf Error: wrong version in compilation unit header "
4312 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
4315 if (header->abbrev_offset.sect_off
4316 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4317 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
4318 "(offset 0x%lx + 6) [in module %s]"),
4319 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
4322 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4323 avoid potential 32-bit overflow. */
4324 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4326 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4327 "(offset 0x%lx + 0) [in module %s]"),
4328 (long) header->length, (long) header->offset.sect_off,
4332 /* Read in a CU/TU header and perform some basic error checking.
4333 The contents of the header are stored in HEADER.
4334 The result is a pointer to the start of the first DIE. */
4336 static const gdb_byte *
4337 read_and_check_comp_unit_head (struct comp_unit_head *header,
4338 struct dwarf2_section_info *section,
4339 struct dwarf2_section_info *abbrev_section,
4340 const gdb_byte *info_ptr,
4341 int is_debug_types_section)
4343 const gdb_byte *beg_of_comp_unit = info_ptr;
4344 bfd *abfd = get_section_bfd_owner (section);
4346 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4348 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4350 /* If we're reading a type unit, skip over the signature and
4351 type_offset fields. */
4352 if (is_debug_types_section)
4353 info_ptr += 8 /*signature*/ + header->offset_size;
4355 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4357 error_check_comp_unit_head (header, section, abbrev_section);
4362 /* Read in the types comp unit header information from .debug_types entry at
4363 types_ptr. The result is a pointer to one past the end of the header. */
4365 static const gdb_byte *
4366 read_and_check_type_unit_head (struct comp_unit_head *header,
4367 struct dwarf2_section_info *section,
4368 struct dwarf2_section_info *abbrev_section,
4369 const gdb_byte *info_ptr,
4370 ULONGEST *signature,
4371 cu_offset *type_offset_in_tu)
4373 const gdb_byte *beg_of_comp_unit = info_ptr;
4374 bfd *abfd = get_section_bfd_owner (section);
4376 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4378 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4380 /* If we're reading a type unit, skip over the signature and
4381 type_offset fields. */
4382 if (signature != NULL)
4383 *signature = read_8_bytes (abfd, info_ptr);
4385 if (type_offset_in_tu != NULL)
4386 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4387 header->offset_size);
4388 info_ptr += header->offset_size;
4390 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4392 error_check_comp_unit_head (header, section, abbrev_section);
4397 /* Fetch the abbreviation table offset from a comp or type unit header. */
4400 read_abbrev_offset (struct dwarf2_section_info *section,
4403 bfd *abfd = get_section_bfd_owner (section);
4404 const gdb_byte *info_ptr;
4405 unsigned int length, initial_length_size, offset_size;
4406 sect_offset abbrev_offset;
4408 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4409 info_ptr = section->buffer + offset.sect_off;
4410 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4411 offset_size = initial_length_size == 4 ? 4 : 8;
4412 info_ptr += initial_length_size + 2 /*version*/;
4413 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4414 return abbrev_offset;
4417 /* Allocate a new partial symtab for file named NAME and mark this new
4418 partial symtab as being an include of PST. */
4421 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4422 struct objfile *objfile)
4424 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4426 if (!IS_ABSOLUTE_PATH (subpst->filename))
4428 /* It shares objfile->objfile_obstack. */
4429 subpst->dirname = pst->dirname;
4432 subpst->section_offsets = pst->section_offsets;
4433 subpst->textlow = 0;
4434 subpst->texthigh = 0;
4436 subpst->dependencies = (struct partial_symtab **)
4437 obstack_alloc (&objfile->objfile_obstack,
4438 sizeof (struct partial_symtab *));
4439 subpst->dependencies[0] = pst;
4440 subpst->number_of_dependencies = 1;
4442 subpst->globals_offset = 0;
4443 subpst->n_global_syms = 0;
4444 subpst->statics_offset = 0;
4445 subpst->n_static_syms = 0;
4446 subpst->symtab = NULL;
4447 subpst->read_symtab = pst->read_symtab;
4450 /* No private part is necessary for include psymtabs. This property
4451 can be used to differentiate between such include psymtabs and
4452 the regular ones. */
4453 subpst->read_symtab_private = NULL;
4456 /* Read the Line Number Program data and extract the list of files
4457 included by the source file represented by PST. Build an include
4458 partial symtab for each of these included files. */
4461 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4462 struct die_info *die,
4463 struct partial_symtab *pst)
4465 struct line_header *lh = NULL;
4466 struct attribute *attr;
4468 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4470 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4472 return; /* No linetable, so no includes. */
4474 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4475 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4477 free_line_header (lh);
4481 hash_signatured_type (const void *item)
4483 const struct signatured_type *sig_type = item;
4485 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4486 return sig_type->signature;
4490 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4492 const struct signatured_type *lhs = item_lhs;
4493 const struct signatured_type *rhs = item_rhs;
4495 return lhs->signature == rhs->signature;
4498 /* Allocate a hash table for signatured types. */
4501 allocate_signatured_type_table (struct objfile *objfile)
4503 return htab_create_alloc_ex (41,
4504 hash_signatured_type,
4507 &objfile->objfile_obstack,
4508 hashtab_obstack_allocate,
4509 dummy_obstack_deallocate);
4512 /* A helper function to add a signatured type CU to a table. */
4515 add_signatured_type_cu_to_table (void **slot, void *datum)
4517 struct signatured_type *sigt = *slot;
4518 struct signatured_type ***datap = datum;
4526 /* Create the hash table of all entries in the .debug_types
4527 (or .debug_types.dwo) section(s).
4528 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4529 otherwise it is NULL.
4531 The result is a pointer to the hash table or NULL if there are no types.
4533 Note: This function processes DWO files only, not DWP files. */
4536 create_debug_types_hash_table (struct dwo_file *dwo_file,
4537 VEC (dwarf2_section_info_def) *types)
4539 struct objfile *objfile = dwarf2_per_objfile->objfile;
4540 htab_t types_htab = NULL;
4542 struct dwarf2_section_info *section;
4543 struct dwarf2_section_info *abbrev_section;
4545 if (VEC_empty (dwarf2_section_info_def, types))
4548 abbrev_section = (dwo_file != NULL
4549 ? &dwo_file->sections.abbrev
4550 : &dwarf2_per_objfile->abbrev);
4552 if (dwarf2_read_debug)
4553 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4554 dwo_file ? ".dwo" : "",
4555 get_section_file_name (abbrev_section));
4558 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4562 const gdb_byte *info_ptr, *end_ptr;
4564 dwarf2_read_section (objfile, section);
4565 info_ptr = section->buffer;
4567 if (info_ptr == NULL)
4570 /* We can't set abfd until now because the section may be empty or
4571 not present, in which case the bfd is unknown. */
4572 abfd = get_section_bfd_owner (section);
4574 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4575 because we don't need to read any dies: the signature is in the
4578 end_ptr = info_ptr + section->size;
4579 while (info_ptr < end_ptr)
4582 cu_offset type_offset_in_tu;
4584 struct signatured_type *sig_type;
4585 struct dwo_unit *dwo_tu;
4587 const gdb_byte *ptr = info_ptr;
4588 struct comp_unit_head header;
4589 unsigned int length;
4591 offset.sect_off = ptr - section->buffer;
4593 /* We need to read the type's signature in order to build the hash
4594 table, but we don't need anything else just yet. */
4596 ptr = read_and_check_type_unit_head (&header, section,
4597 abbrev_section, ptr,
4598 &signature, &type_offset_in_tu);
4600 length = get_cu_length (&header);
4602 /* Skip dummy type units. */
4603 if (ptr >= info_ptr + length
4604 || peek_abbrev_code (abfd, ptr) == 0)
4610 if (types_htab == NULL)
4613 types_htab = allocate_dwo_unit_table (objfile);
4615 types_htab = allocate_signatured_type_table (objfile);
4621 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4623 dwo_tu->dwo_file = dwo_file;
4624 dwo_tu->signature = signature;
4625 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4626 dwo_tu->section = section;
4627 dwo_tu->offset = offset;
4628 dwo_tu->length = length;
4632 /* N.B.: type_offset is not usable if this type uses a DWO file.
4633 The real type_offset is in the DWO file. */
4635 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4636 struct signatured_type);
4637 sig_type->signature = signature;
4638 sig_type->type_offset_in_tu = type_offset_in_tu;
4639 sig_type->per_cu.objfile = objfile;
4640 sig_type->per_cu.is_debug_types = 1;
4641 sig_type->per_cu.section = section;
4642 sig_type->per_cu.offset = offset;
4643 sig_type->per_cu.length = length;
4646 slot = htab_find_slot (types_htab,
4647 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4649 gdb_assert (slot != NULL);
4652 sect_offset dup_offset;
4656 const struct dwo_unit *dup_tu = *slot;
4658 dup_offset = dup_tu->offset;
4662 const struct signatured_type *dup_tu = *slot;
4664 dup_offset = dup_tu->per_cu.offset;
4667 complaint (&symfile_complaints,
4668 _("debug type entry at offset 0x%x is duplicate to"
4669 " the entry at offset 0x%x, signature %s"),
4670 offset.sect_off, dup_offset.sect_off,
4671 hex_string (signature));
4673 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4675 if (dwarf2_read_debug > 1)
4676 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4678 hex_string (signature));
4687 /* Create the hash table of all entries in the .debug_types section,
4688 and initialize all_type_units.
4689 The result is zero if there is an error (e.g. missing .debug_types section),
4690 otherwise non-zero. */
4693 create_all_type_units (struct objfile *objfile)
4696 struct signatured_type **iter;
4698 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4699 if (types_htab == NULL)
4701 dwarf2_per_objfile->signatured_types = NULL;
4705 dwarf2_per_objfile->signatured_types = types_htab;
4707 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4708 dwarf2_per_objfile->all_type_units
4709 = xmalloc (dwarf2_per_objfile->n_type_units
4710 * sizeof (struct signatured_type *));
4711 iter = &dwarf2_per_objfile->all_type_units[0];
4712 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4713 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4714 == dwarf2_per_objfile->n_type_units);
4719 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4720 Fill in SIG_ENTRY with DWO_ENTRY. */
4723 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4724 struct signatured_type *sig_entry,
4725 struct dwo_unit *dwo_entry)
4727 /* Make sure we're not clobbering something we don't expect to. */
4728 gdb_assert (! sig_entry->per_cu.queued);
4729 gdb_assert (sig_entry->per_cu.cu == NULL);
4730 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4731 gdb_assert (sig_entry->per_cu.v.quick->symtab == NULL);
4732 gdb_assert (sig_entry->signature == dwo_entry->signature);
4733 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4734 gdb_assert (sig_entry->type_unit_group == NULL);
4735 gdb_assert (sig_entry->dwo_unit == NULL);
4737 sig_entry->per_cu.section = dwo_entry->section;
4738 sig_entry->per_cu.offset = dwo_entry->offset;
4739 sig_entry->per_cu.length = dwo_entry->length;
4740 sig_entry->per_cu.reading_dwo_directly = 1;
4741 sig_entry->per_cu.objfile = objfile;
4742 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4743 sig_entry->dwo_unit = dwo_entry;
4746 /* Subroutine of lookup_signatured_type.
4747 If we haven't read the TU yet, create the signatured_type data structure
4748 for a TU to be read in directly from a DWO file, bypassing the stub.
4749 This is the "Stay in DWO Optimization": When there is no DWP file and we're
4750 using .gdb_index, then when reading a CU we want to stay in the DWO file
4751 containing that CU. Otherwise we could end up reading several other DWO
4752 files (due to comdat folding) to process the transitive closure of all the
4753 mentioned TUs, and that can be slow. The current DWO file will have every
4754 type signature that it needs.
4755 We only do this for .gdb_index because in the psymtab case we already have
4756 to read all the DWOs to build the type unit groups. */
4758 static struct signatured_type *
4759 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4761 struct objfile *objfile = dwarf2_per_objfile->objfile;
4762 struct dwo_file *dwo_file;
4763 struct dwo_unit find_dwo_entry, *dwo_entry;
4764 struct signatured_type find_sig_entry, *sig_entry;
4766 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4768 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4769 dwo_unit of the TU itself. */
4770 dwo_file = cu->dwo_unit->dwo_file;
4772 /* We only ever need to read in one copy of a signatured type.
4773 Just use the global signatured_types array. If this is the first time
4774 we're reading this type, replace the recorded data from .gdb_index with
4777 if (dwarf2_per_objfile->signatured_types == NULL)
4779 find_sig_entry.signature = sig;
4780 sig_entry = htab_find (dwarf2_per_objfile->signatured_types, &find_sig_entry);
4781 if (sig_entry == NULL)
4784 /* We can get here with the TU already read, *or* in the process of being
4785 read. Don't reassign it if that's the case. Also note that if the TU is
4786 already being read, it may not have come from a DWO, the program may be
4787 a mix of Fission-compiled code and non-Fission-compiled code. */
4788 /* Have we already tried to read this TU? */
4789 if (sig_entry->per_cu.tu_read)
4792 /* Ok, this is the first time we're reading this TU. */
4793 if (dwo_file->tus == NULL)
4795 find_dwo_entry.signature = sig;
4796 dwo_entry = htab_find (dwo_file->tus, &find_dwo_entry);
4797 if (dwo_entry == NULL)
4800 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4801 sig_entry->per_cu.tu_read = 1;
4805 /* Subroutine of lookup_dwp_signatured_type.
4806 Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. */
4808 static struct signatured_type *
4809 add_type_unit (ULONGEST sig)
4811 struct objfile *objfile = dwarf2_per_objfile->objfile;
4812 int n_type_units = dwarf2_per_objfile->n_type_units;
4813 struct signatured_type *sig_type;
4817 dwarf2_per_objfile->all_type_units =
4818 xrealloc (dwarf2_per_objfile->all_type_units,
4819 n_type_units * sizeof (struct signatured_type *));
4820 dwarf2_per_objfile->n_type_units = n_type_units;
4821 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4822 struct signatured_type);
4823 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4824 sig_type->signature = sig;
4825 sig_type->per_cu.is_debug_types = 1;
4826 sig_type->per_cu.v.quick =
4827 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4828 struct dwarf2_per_cu_quick_data);
4829 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4831 gdb_assert (*slot == NULL);
4833 /* The rest of sig_type must be filled in by the caller. */
4837 /* Subroutine of lookup_signatured_type.
4838 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4839 then try the DWP file.
4840 Normally this "can't happen", but if there's a bug in signature
4841 generation and/or the DWP file is built incorrectly, it can happen.
4842 Using the type directly from the DWP file means we don't have the stub
4843 which has some useful attributes (e.g., DW_AT_comp_dir), but they're
4844 not critical. [Eventually the stub may go away for type units anyway.] */
4846 static struct signatured_type *
4847 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4849 struct objfile *objfile = dwarf2_per_objfile->objfile;
4850 struct dwp_file *dwp_file = get_dwp_file ();
4851 struct dwo_unit *dwo_entry;
4852 struct signatured_type find_sig_entry, *sig_entry;
4854 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4855 gdb_assert (dwp_file != NULL);
4857 if (dwarf2_per_objfile->signatured_types != NULL)
4859 find_sig_entry.signature = sig;
4860 sig_entry = htab_find (dwarf2_per_objfile->signatured_types,
4862 if (sig_entry != NULL)
4866 /* This is the "shouldn't happen" case.
4867 Try the DWP file and hope for the best. */
4868 if (dwp_file->tus == NULL)
4870 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
4871 sig, 1 /* is_debug_types */);
4872 if (dwo_entry == NULL)
4875 sig_entry = add_type_unit (sig);
4876 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4878 /* The caller will signal a complaint if we return NULL.
4879 Here we don't return NULL but we still want to complain. */
4880 complaint (&symfile_complaints,
4881 _("Bad type signature %s referenced by %s at 0x%x,"
4882 " coping by using copy in DWP [in module %s]"),
4884 cu->per_cu->is_debug_types ? "TU" : "CU",
4885 cu->per_cu->offset.sect_off,
4886 objfile_name (objfile));
4891 /* Lookup a signature based type for DW_FORM_ref_sig8.
4892 Returns NULL if signature SIG is not present in the table.
4893 It is up to the caller to complain about this. */
4895 static struct signatured_type *
4896 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4899 && dwarf2_per_objfile->using_index)
4901 /* We're in a DWO/DWP file, and we're using .gdb_index.
4902 These cases require special processing. */
4903 if (get_dwp_file () == NULL)
4904 return lookup_dwo_signatured_type (cu, sig);
4906 return lookup_dwp_signatured_type (cu, sig);
4910 struct signatured_type find_entry, *entry;
4912 if (dwarf2_per_objfile->signatured_types == NULL)
4914 find_entry.signature = sig;
4915 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4920 /* Low level DIE reading support. */
4922 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4925 init_cu_die_reader (struct die_reader_specs *reader,
4926 struct dwarf2_cu *cu,
4927 struct dwarf2_section_info *section,
4928 struct dwo_file *dwo_file)
4930 gdb_assert (section->readin && section->buffer != NULL);
4931 reader->abfd = get_section_bfd_owner (section);
4933 reader->dwo_file = dwo_file;
4934 reader->die_section = section;
4935 reader->buffer = section->buffer;
4936 reader->buffer_end = section->buffer + section->size;
4937 reader->comp_dir = NULL;
4940 /* Subroutine of init_cutu_and_read_dies to simplify it.
4941 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4942 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4945 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4946 from it to the DIE in the DWO. If NULL we are skipping the stub.
4947 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
4948 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
4949 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
4950 STUB_COMP_DIR may be non-NULL.
4951 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4952 are filled in with the info of the DIE from the DWO file.
4953 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4954 provided an abbrev table to use.
4955 The result is non-zero if a valid (non-dummy) DIE was found. */
4958 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4959 struct dwo_unit *dwo_unit,
4960 int abbrev_table_provided,
4961 struct die_info *stub_comp_unit_die,
4962 const char *stub_comp_dir,
4963 struct die_reader_specs *result_reader,
4964 const gdb_byte **result_info_ptr,
4965 struct die_info **result_comp_unit_die,
4966 int *result_has_children)
4968 struct objfile *objfile = dwarf2_per_objfile->objfile;
4969 struct dwarf2_cu *cu = this_cu->cu;
4970 struct dwarf2_section_info *section;
4972 const gdb_byte *begin_info_ptr, *info_ptr;
4973 ULONGEST signature; /* Or dwo_id. */
4974 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4975 int i,num_extra_attrs;
4976 struct dwarf2_section_info *dwo_abbrev_section;
4977 struct attribute *attr;
4978 struct die_info *comp_unit_die;
4980 /* At most one of these may be provided. */
4981 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
4983 /* These attributes aren't processed until later:
4984 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4985 DW_AT_comp_dir is used now, to find the DWO file, but it is also
4986 referenced later. However, these attributes are found in the stub
4987 which we won't have later. In order to not impose this complication
4988 on the rest of the code, we read them here and copy them to the
4997 if (stub_comp_unit_die != NULL)
4999 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5001 if (! this_cu->is_debug_types)
5002 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5003 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5004 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5005 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5006 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5008 /* There should be a DW_AT_addr_base attribute here (if needed).
5009 We need the value before we can process DW_FORM_GNU_addr_index. */
5011 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5013 cu->addr_base = DW_UNSND (attr);
5015 /* There should be a DW_AT_ranges_base attribute here (if needed).
5016 We need the value before we can process DW_AT_ranges. */
5017 cu->ranges_base = 0;
5018 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5020 cu->ranges_base = DW_UNSND (attr);
5022 else if (stub_comp_dir != NULL)
5024 /* Reconstruct the comp_dir attribute to simplify the code below. */
5025 comp_dir = (struct attribute *)
5026 obstack_alloc (&cu->comp_unit_obstack, sizeof (*comp_dir));
5027 comp_dir->name = DW_AT_comp_dir;
5028 comp_dir->form = DW_FORM_string;
5029 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5030 DW_STRING (comp_dir) = stub_comp_dir;
5033 /* Set up for reading the DWO CU/TU. */
5034 cu->dwo_unit = dwo_unit;
5035 section = dwo_unit->section;
5036 dwarf2_read_section (objfile, section);
5037 abfd = get_section_bfd_owner (section);
5038 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
5039 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5040 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5042 if (this_cu->is_debug_types)
5044 ULONGEST header_signature;
5045 cu_offset type_offset_in_tu;
5046 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5048 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5052 &type_offset_in_tu);
5053 /* This is not an assert because it can be caused by bad debug info. */
5054 if (sig_type->signature != header_signature)
5056 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5057 " TU at offset 0x%x [in module %s]"),
5058 hex_string (sig_type->signature),
5059 hex_string (header_signature),
5060 dwo_unit->offset.sect_off,
5061 bfd_get_filename (abfd));
5063 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5064 /* For DWOs coming from DWP files, we don't know the CU length
5065 nor the type's offset in the TU until now. */
5066 dwo_unit->length = get_cu_length (&cu->header);
5067 dwo_unit->type_offset_in_tu = type_offset_in_tu;
5069 /* Establish the type offset that can be used to lookup the type.
5070 For DWO files, we don't know it until now. */
5071 sig_type->type_offset_in_section.sect_off =
5072 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
5076 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5079 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5080 /* For DWOs coming from DWP files, we don't know the CU length
5082 dwo_unit->length = get_cu_length (&cu->header);
5085 /* Replace the CU's original abbrev table with the DWO's.
5086 Reminder: We can't read the abbrev table until we've read the header. */
5087 if (abbrev_table_provided)
5089 /* Don't free the provided abbrev table, the caller of
5090 init_cutu_and_read_dies owns it. */
5091 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5092 /* Ensure the DWO abbrev table gets freed. */
5093 make_cleanup (dwarf2_free_abbrev_table, cu);
5097 dwarf2_free_abbrev_table (cu);
5098 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5099 /* Leave any existing abbrev table cleanup as is. */
5102 /* Read in the die, but leave space to copy over the attributes
5103 from the stub. This has the benefit of simplifying the rest of
5104 the code - all the work to maintain the illusion of a single
5105 DW_TAG_{compile,type}_unit DIE is done here. */
5106 num_extra_attrs = ((stmt_list != NULL)
5110 + (comp_dir != NULL));
5111 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5112 result_has_children, num_extra_attrs);
5114 /* Copy over the attributes from the stub to the DIE we just read in. */
5115 comp_unit_die = *result_comp_unit_die;
5116 i = comp_unit_die->num_attrs;
5117 if (stmt_list != NULL)
5118 comp_unit_die->attrs[i++] = *stmt_list;
5120 comp_unit_die->attrs[i++] = *low_pc;
5121 if (high_pc != NULL)
5122 comp_unit_die->attrs[i++] = *high_pc;
5124 comp_unit_die->attrs[i++] = *ranges;
5125 if (comp_dir != NULL)
5126 comp_unit_die->attrs[i++] = *comp_dir;
5127 comp_unit_die->num_attrs += num_extra_attrs;
5129 if (dwarf2_die_debug)
5131 fprintf_unfiltered (gdb_stdlog,
5132 "Read die from %s@0x%x of %s:\n",
5133 get_section_name (section),
5134 (unsigned) (begin_info_ptr - section->buffer),
5135 bfd_get_filename (abfd));
5136 dump_die (comp_unit_die, dwarf2_die_debug);
5139 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5140 TUs by skipping the stub and going directly to the entry in the DWO file.
5141 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5142 to get it via circuitous means. Blech. */
5143 if (comp_dir != NULL)
5144 result_reader->comp_dir = DW_STRING (comp_dir);
5146 /* Skip dummy compilation units. */
5147 if (info_ptr >= begin_info_ptr + dwo_unit->length
5148 || peek_abbrev_code (abfd, info_ptr) == 0)
5151 *result_info_ptr = info_ptr;
5155 /* Subroutine of init_cutu_and_read_dies to simplify it.
5156 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5157 Returns NULL if the specified DWO unit cannot be found. */
5159 static struct dwo_unit *
5160 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5161 struct die_info *comp_unit_die)
5163 struct dwarf2_cu *cu = this_cu->cu;
5164 struct attribute *attr;
5166 struct dwo_unit *dwo_unit;
5167 const char *comp_dir, *dwo_name;
5169 gdb_assert (cu != NULL);
5171 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5172 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5173 gdb_assert (attr != NULL);
5174 dwo_name = DW_STRING (attr);
5176 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5178 comp_dir = DW_STRING (attr);
5180 if (this_cu->is_debug_types)
5182 struct signatured_type *sig_type;
5184 /* Since this_cu is the first member of struct signatured_type,
5185 we can go from a pointer to one to a pointer to the other. */
5186 sig_type = (struct signatured_type *) this_cu;
5187 signature = sig_type->signature;
5188 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5192 struct attribute *attr;
5194 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5196 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5198 dwo_name, objfile_name (this_cu->objfile));
5199 signature = DW_UNSND (attr);
5200 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5207 /* Subroutine of init_cutu_and_read_dies to simplify it.
5208 Read a TU directly from a DWO file, bypassing the stub. */
5211 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, int keep,
5212 die_reader_func_ftype *die_reader_func,
5215 struct dwarf2_cu *cu;
5216 struct signatured_type *sig_type;
5217 struct cleanup *cleanups, *free_cu_cleanup;
5218 struct die_reader_specs reader;
5219 const gdb_byte *info_ptr;
5220 struct die_info *comp_unit_die;
5223 /* Verify we can do the following downcast, and that we have the
5225 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5226 sig_type = (struct signatured_type *) this_cu;
5227 gdb_assert (sig_type->dwo_unit != NULL);
5229 cleanups = make_cleanup (null_cleanup, NULL);
5231 gdb_assert (this_cu->cu == NULL);
5232 cu = xmalloc (sizeof (*cu));
5233 init_one_comp_unit (cu, this_cu);
5234 /* If an error occurs while loading, release our storage. */
5235 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5237 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5238 0 /* abbrev_table_provided */,
5239 NULL /* stub_comp_unit_die */,
5240 sig_type->dwo_unit->dwo_file->comp_dir,
5242 &comp_unit_die, &has_children) == 0)
5245 do_cleanups (cleanups);
5249 /* All the "real" work is done here. */
5250 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5252 /* This duplicates some code in init_cutu_and_read_dies,
5253 but the alternative is making the latter more complex.
5254 This function is only for the special case of using DWO files directly:
5255 no point in overly complicating the general case just to handle this. */
5258 /* We've successfully allocated this compilation unit. Let our
5259 caller clean it up when finished with it. */
5260 discard_cleanups (free_cu_cleanup);
5262 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5263 So we have to manually free the abbrev table. */
5264 dwarf2_free_abbrev_table (cu);
5266 /* Link this CU into read_in_chain. */
5267 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5268 dwarf2_per_objfile->read_in_chain = this_cu;
5271 do_cleanups (free_cu_cleanup);
5273 do_cleanups (cleanups);
5276 /* Initialize a CU (or TU) and read its DIEs.
5277 If the CU defers to a DWO file, read the DWO file as well.
5279 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5280 Otherwise the table specified in the comp unit header is read in and used.
5281 This is an optimization for when we already have the abbrev table.
5283 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5284 Otherwise, a new CU is allocated with xmalloc.
5286 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5287 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5289 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5290 linker) then DIE_READER_FUNC will not get called. */
5293 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5294 struct abbrev_table *abbrev_table,
5295 int use_existing_cu, int keep,
5296 die_reader_func_ftype *die_reader_func,
5299 struct objfile *objfile = dwarf2_per_objfile->objfile;
5300 struct dwarf2_section_info *section = this_cu->section;
5301 bfd *abfd = get_section_bfd_owner (section);
5302 struct dwarf2_cu *cu;
5303 const gdb_byte *begin_info_ptr, *info_ptr;
5304 struct die_reader_specs reader;
5305 struct die_info *comp_unit_die;
5307 struct attribute *attr;
5308 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5309 struct signatured_type *sig_type = NULL;
5310 struct dwarf2_section_info *abbrev_section;
5311 /* Non-zero if CU currently points to a DWO file and we need to
5312 reread it. When this happens we need to reread the skeleton die
5313 before we can reread the DWO file (this only applies to CUs, not TUs). */
5314 int rereading_dwo_cu = 0;
5316 if (dwarf2_die_debug)
5317 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5318 this_cu->is_debug_types ? "type" : "comp",
5319 this_cu->offset.sect_off);
5321 if (use_existing_cu)
5324 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5325 file (instead of going through the stub), short-circuit all of this. */
5326 if (this_cu->reading_dwo_directly)
5328 /* Narrow down the scope of possibilities to have to understand. */
5329 gdb_assert (this_cu->is_debug_types);
5330 gdb_assert (abbrev_table == NULL);
5331 gdb_assert (!use_existing_cu);
5332 init_tu_and_read_dwo_dies (this_cu, keep, die_reader_func, data);
5336 cleanups = make_cleanup (null_cleanup, NULL);
5338 /* This is cheap if the section is already read in. */
5339 dwarf2_read_section (objfile, section);
5341 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5343 abbrev_section = get_abbrev_section_for_cu (this_cu);
5345 if (use_existing_cu && this_cu->cu != NULL)
5349 /* If this CU is from a DWO file we need to start over, we need to
5350 refetch the attributes from the skeleton CU.
5351 This could be optimized by retrieving those attributes from when we
5352 were here the first time: the previous comp_unit_die was stored in
5353 comp_unit_obstack. But there's no data yet that we need this
5355 if (cu->dwo_unit != NULL)
5356 rereading_dwo_cu = 1;
5360 /* If !use_existing_cu, this_cu->cu must be NULL. */
5361 gdb_assert (this_cu->cu == NULL);
5363 cu = xmalloc (sizeof (*cu));
5364 init_one_comp_unit (cu, this_cu);
5366 /* If an error occurs while loading, release our storage. */
5367 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5370 /* Get the header. */
5371 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5373 /* We already have the header, there's no need to read it in again. */
5374 info_ptr += cu->header.first_die_offset.cu_off;
5378 if (this_cu->is_debug_types)
5381 cu_offset type_offset_in_tu;
5383 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5384 abbrev_section, info_ptr,
5386 &type_offset_in_tu);
5388 /* Since per_cu is the first member of struct signatured_type,
5389 we can go from a pointer to one to a pointer to the other. */
5390 sig_type = (struct signatured_type *) this_cu;
5391 gdb_assert (sig_type->signature == signature);
5392 gdb_assert (sig_type->type_offset_in_tu.cu_off
5393 == type_offset_in_tu.cu_off);
5394 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5396 /* LENGTH has not been set yet for type units if we're
5397 using .gdb_index. */
5398 this_cu->length = get_cu_length (&cu->header);
5400 /* Establish the type offset that can be used to lookup the type. */
5401 sig_type->type_offset_in_section.sect_off =
5402 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5406 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5410 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5411 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5415 /* Skip dummy compilation units. */
5416 if (info_ptr >= begin_info_ptr + this_cu->length
5417 || peek_abbrev_code (abfd, info_ptr) == 0)
5419 do_cleanups (cleanups);
5423 /* If we don't have them yet, read the abbrevs for this compilation unit.
5424 And if we need to read them now, make sure they're freed when we're
5425 done. Note that it's important that if the CU had an abbrev table
5426 on entry we don't free it when we're done: Somewhere up the call stack
5427 it may be in use. */
5428 if (abbrev_table != NULL)
5430 gdb_assert (cu->abbrev_table == NULL);
5431 gdb_assert (cu->header.abbrev_offset.sect_off
5432 == abbrev_table->offset.sect_off);
5433 cu->abbrev_table = abbrev_table;
5435 else if (cu->abbrev_table == NULL)
5437 dwarf2_read_abbrevs (cu, abbrev_section);
5438 make_cleanup (dwarf2_free_abbrev_table, cu);
5440 else if (rereading_dwo_cu)
5442 dwarf2_free_abbrev_table (cu);
5443 dwarf2_read_abbrevs (cu, abbrev_section);
5446 /* Read the top level CU/TU die. */
5447 init_cu_die_reader (&reader, cu, section, NULL);
5448 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5450 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5452 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5453 DWO CU, that this test will fail (the attribute will not be present). */
5454 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5457 struct dwo_unit *dwo_unit;
5458 struct die_info *dwo_comp_unit_die;
5462 complaint (&symfile_complaints,
5463 _("compilation unit with DW_AT_GNU_dwo_name"
5464 " has children (offset 0x%x) [in module %s]"),
5465 this_cu->offset.sect_off, bfd_get_filename (abfd));
5467 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5468 if (dwo_unit != NULL)
5470 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5471 abbrev_table != NULL,
5472 comp_unit_die, NULL,
5474 &dwo_comp_unit_die, &has_children) == 0)
5477 do_cleanups (cleanups);
5480 comp_unit_die = dwo_comp_unit_die;
5484 /* Yikes, we couldn't find the rest of the DIE, we only have
5485 the stub. A complaint has already been logged. There's
5486 not much more we can do except pass on the stub DIE to
5487 die_reader_func. We don't want to throw an error on bad
5492 /* All of the above is setup for this call. Yikes. */
5493 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5495 /* Done, clean up. */
5496 if (free_cu_cleanup != NULL)
5500 /* We've successfully allocated this compilation unit. Let our
5501 caller clean it up when finished with it. */
5502 discard_cleanups (free_cu_cleanup);
5504 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5505 So we have to manually free the abbrev table. */
5506 dwarf2_free_abbrev_table (cu);
5508 /* Link this CU into read_in_chain. */
5509 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5510 dwarf2_per_objfile->read_in_chain = this_cu;
5513 do_cleanups (free_cu_cleanup);
5516 do_cleanups (cleanups);
5519 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5520 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5521 to have already done the lookup to find the DWO file).
5523 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5524 THIS_CU->is_debug_types, but nothing else.
5526 We fill in THIS_CU->length.
5528 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5529 linker) then DIE_READER_FUNC will not get called.
5531 THIS_CU->cu is always freed when done.
5532 This is done in order to not leave THIS_CU->cu in a state where we have
5533 to care whether it refers to the "main" CU or the DWO CU. */
5536 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5537 struct dwo_file *dwo_file,
5538 die_reader_func_ftype *die_reader_func,
5541 struct objfile *objfile = dwarf2_per_objfile->objfile;
5542 struct dwarf2_section_info *section = this_cu->section;
5543 bfd *abfd = get_section_bfd_owner (section);
5544 struct dwarf2_section_info *abbrev_section;
5545 struct dwarf2_cu cu;
5546 const gdb_byte *begin_info_ptr, *info_ptr;
5547 struct die_reader_specs reader;
5548 struct cleanup *cleanups;
5549 struct die_info *comp_unit_die;
5552 if (dwarf2_die_debug)
5553 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5554 this_cu->is_debug_types ? "type" : "comp",
5555 this_cu->offset.sect_off);
5557 gdb_assert (this_cu->cu == NULL);
5559 abbrev_section = (dwo_file != NULL
5560 ? &dwo_file->sections.abbrev
5561 : get_abbrev_section_for_cu (this_cu));
5563 /* This is cheap if the section is already read in. */
5564 dwarf2_read_section (objfile, section);
5566 init_one_comp_unit (&cu, this_cu);
5568 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5570 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5571 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5572 abbrev_section, info_ptr,
5573 this_cu->is_debug_types);
5575 this_cu->length = get_cu_length (&cu.header);
5577 /* Skip dummy compilation units. */
5578 if (info_ptr >= begin_info_ptr + this_cu->length
5579 || peek_abbrev_code (abfd, info_ptr) == 0)
5581 do_cleanups (cleanups);
5585 dwarf2_read_abbrevs (&cu, abbrev_section);
5586 make_cleanup (dwarf2_free_abbrev_table, &cu);
5588 init_cu_die_reader (&reader, &cu, section, dwo_file);
5589 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5591 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5593 do_cleanups (cleanups);
5596 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5597 does not lookup the specified DWO file.
5598 This cannot be used to read DWO files.
5600 THIS_CU->cu is always freed when done.
5601 This is done in order to not leave THIS_CU->cu in a state where we have
5602 to care whether it refers to the "main" CU or the DWO CU.
5603 We can revisit this if the data shows there's a performance issue. */
5606 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5607 die_reader_func_ftype *die_reader_func,
5610 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5613 /* Type Unit Groups.
5615 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5616 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5617 so that all types coming from the same compilation (.o file) are grouped
5618 together. A future step could be to put the types in the same symtab as
5619 the CU the types ultimately came from. */
5622 hash_type_unit_group (const void *item)
5624 const struct type_unit_group *tu_group = item;
5626 return hash_stmt_list_entry (&tu_group->hash);
5630 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5632 const struct type_unit_group *lhs = item_lhs;
5633 const struct type_unit_group *rhs = item_rhs;
5635 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5638 /* Allocate a hash table for type unit groups. */
5641 allocate_type_unit_groups_table (void)
5643 return htab_create_alloc_ex (3,
5644 hash_type_unit_group,
5647 &dwarf2_per_objfile->objfile->objfile_obstack,
5648 hashtab_obstack_allocate,
5649 dummy_obstack_deallocate);
5652 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5653 partial symtabs. We combine several TUs per psymtab to not let the size
5654 of any one psymtab grow too big. */
5655 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5656 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5658 /* Helper routine for get_type_unit_group.
5659 Create the type_unit_group object used to hold one or more TUs. */
5661 static struct type_unit_group *
5662 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5664 struct objfile *objfile = dwarf2_per_objfile->objfile;
5665 struct dwarf2_per_cu_data *per_cu;
5666 struct type_unit_group *tu_group;
5668 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5669 struct type_unit_group);
5670 per_cu = &tu_group->per_cu;
5671 per_cu->objfile = objfile;
5673 if (dwarf2_per_objfile->using_index)
5675 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5676 struct dwarf2_per_cu_quick_data);
5680 unsigned int line_offset = line_offset_struct.sect_off;
5681 struct partial_symtab *pst;
5684 /* Give the symtab a useful name for debug purposes. */
5685 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5686 name = xstrprintf ("<type_units_%d>",
5687 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5689 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5691 pst = create_partial_symtab (per_cu, name);
5697 tu_group->hash.dwo_unit = cu->dwo_unit;
5698 tu_group->hash.line_offset = line_offset_struct;
5703 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5704 STMT_LIST is a DW_AT_stmt_list attribute. */
5706 static struct type_unit_group *
5707 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
5709 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5710 struct type_unit_group *tu_group;
5712 unsigned int line_offset;
5713 struct type_unit_group type_unit_group_for_lookup;
5715 if (dwarf2_per_objfile->type_unit_groups == NULL)
5717 dwarf2_per_objfile->type_unit_groups =
5718 allocate_type_unit_groups_table ();
5721 /* Do we need to create a new group, or can we use an existing one? */
5725 line_offset = DW_UNSND (stmt_list);
5726 ++tu_stats->nr_symtab_sharers;
5730 /* Ugh, no stmt_list. Rare, but we have to handle it.
5731 We can do various things here like create one group per TU or
5732 spread them over multiple groups to split up the expansion work.
5733 To avoid worst case scenarios (too many groups or too large groups)
5734 we, umm, group them in bunches. */
5735 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5736 | (tu_stats->nr_stmt_less_type_units
5737 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5738 ++tu_stats->nr_stmt_less_type_units;
5741 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5742 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5743 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5744 &type_unit_group_for_lookup, INSERT);
5748 gdb_assert (tu_group != NULL);
5752 sect_offset line_offset_struct;
5754 line_offset_struct.sect_off = line_offset;
5755 tu_group = create_type_unit_group (cu, line_offset_struct);
5757 ++tu_stats->nr_symtabs;
5763 /* Struct used to sort TUs by their abbreviation table offset. */
5765 struct tu_abbrev_offset
5767 struct signatured_type *sig_type;
5768 sect_offset abbrev_offset;
5771 /* Helper routine for build_type_unit_groups, passed to qsort. */
5774 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5776 const struct tu_abbrev_offset * const *a = ap;
5777 const struct tu_abbrev_offset * const *b = bp;
5778 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5779 unsigned int boff = (*b)->abbrev_offset.sect_off;
5781 return (aoff > boff) - (aoff < boff);
5784 /* A helper function to add a type_unit_group to a table. */
5787 add_type_unit_group_to_table (void **slot, void *datum)
5789 struct type_unit_group *tu_group = *slot;
5790 struct type_unit_group ***datap = datum;
5798 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5799 each one passing FUNC,DATA.
5801 The efficiency is because we sort TUs by the abbrev table they use and
5802 only read each abbrev table once. In one program there are 200K TUs
5803 sharing 8K abbrev tables.
5805 The main purpose of this function is to support building the
5806 dwarf2_per_objfile->type_unit_groups table.
5807 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5808 can collapse the search space by grouping them by stmt_list.
5809 The savings can be significant, in the same program from above the 200K TUs
5810 share 8K stmt_list tables.
5812 FUNC is expected to call get_type_unit_group, which will create the
5813 struct type_unit_group if necessary and add it to
5814 dwarf2_per_objfile->type_unit_groups. */
5817 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5819 struct objfile *objfile = dwarf2_per_objfile->objfile;
5820 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5821 struct cleanup *cleanups;
5822 struct abbrev_table *abbrev_table;
5823 sect_offset abbrev_offset;
5824 struct tu_abbrev_offset *sorted_by_abbrev;
5825 struct type_unit_group **iter;
5828 /* It's up to the caller to not call us multiple times. */
5829 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5831 if (dwarf2_per_objfile->n_type_units == 0)
5834 /* TUs typically share abbrev tables, and there can be way more TUs than
5835 abbrev tables. Sort by abbrev table to reduce the number of times we
5836 read each abbrev table in.
5837 Alternatives are to punt or to maintain a cache of abbrev tables.
5838 This is simpler and efficient enough for now.
5840 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5841 symtab to use). Typically TUs with the same abbrev offset have the same
5842 stmt_list value too so in practice this should work well.
5844 The basic algorithm here is:
5846 sort TUs by abbrev table
5847 for each TU with same abbrev table:
5848 read abbrev table if first user
5849 read TU top level DIE
5850 [IWBN if DWO skeletons had DW_AT_stmt_list]
5853 if (dwarf2_read_debug)
5854 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5856 /* Sort in a separate table to maintain the order of all_type_units
5857 for .gdb_index: TU indices directly index all_type_units. */
5858 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5859 dwarf2_per_objfile->n_type_units);
5860 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5862 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5864 sorted_by_abbrev[i].sig_type = sig_type;
5865 sorted_by_abbrev[i].abbrev_offset =
5866 read_abbrev_offset (sig_type->per_cu.section,
5867 sig_type->per_cu.offset);
5869 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5870 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5871 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5873 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5874 called any number of times, so we don't reset tu_stats here. */
5876 abbrev_offset.sect_off = ~(unsigned) 0;
5877 abbrev_table = NULL;
5878 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5880 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5882 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5884 /* Switch to the next abbrev table if necessary. */
5885 if (abbrev_table == NULL
5886 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5888 if (abbrev_table != NULL)
5890 abbrev_table_free (abbrev_table);
5891 /* Reset to NULL in case abbrev_table_read_table throws
5892 an error: abbrev_table_free_cleanup will get called. */
5893 abbrev_table = NULL;
5895 abbrev_offset = tu->abbrev_offset;
5897 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5899 ++tu_stats->nr_uniq_abbrev_tables;
5902 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5906 /* type_unit_groups can be NULL if there is an error in the debug info.
5907 Just create an empty table so the rest of gdb doesn't have to watch
5908 for this error case. */
5909 if (dwarf2_per_objfile->type_unit_groups == NULL)
5911 dwarf2_per_objfile->type_unit_groups =
5912 allocate_type_unit_groups_table ();
5913 dwarf2_per_objfile->n_type_unit_groups = 0;
5916 /* Create a vector of pointers to primary type units to make it easy to
5917 iterate over them and CUs. See dw2_get_primary_cu. */
5918 dwarf2_per_objfile->n_type_unit_groups =
5919 htab_elements (dwarf2_per_objfile->type_unit_groups);
5920 dwarf2_per_objfile->all_type_unit_groups =
5921 obstack_alloc (&objfile->objfile_obstack,
5922 dwarf2_per_objfile->n_type_unit_groups
5923 * sizeof (struct type_unit_group *));
5924 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5925 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5926 add_type_unit_group_to_table, &iter);
5927 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5928 == dwarf2_per_objfile->n_type_unit_groups);
5930 do_cleanups (cleanups);
5932 if (dwarf2_read_debug)
5934 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5935 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5936 dwarf2_per_objfile->n_type_units);
5937 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5938 tu_stats->nr_uniq_abbrev_tables);
5939 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5940 tu_stats->nr_symtabs);
5941 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5942 tu_stats->nr_symtab_sharers);
5943 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5944 tu_stats->nr_stmt_less_type_units);
5948 /* Partial symbol tables. */
5950 /* Create a psymtab named NAME and assign it to PER_CU.
5952 The caller must fill in the following details:
5953 dirname, textlow, texthigh. */
5955 static struct partial_symtab *
5956 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5958 struct objfile *objfile = per_cu->objfile;
5959 struct partial_symtab *pst;
5961 pst = start_psymtab_common (objfile, objfile->section_offsets,
5963 objfile->global_psymbols.next,
5964 objfile->static_psymbols.next);
5966 pst->psymtabs_addrmap_supported = 1;
5968 /* This is the glue that links PST into GDB's symbol API. */
5969 pst->read_symtab_private = per_cu;
5970 pst->read_symtab = dwarf2_read_symtab;
5971 per_cu->v.psymtab = pst;
5976 /* The DATA object passed to process_psymtab_comp_unit_reader has this
5979 struct process_psymtab_comp_unit_data
5981 /* True if we are reading a DW_TAG_partial_unit. */
5983 int want_partial_unit;
5985 /* The "pretend" language that is used if the CU doesn't declare a
5988 enum language pretend_language;
5991 /* die_reader_func for process_psymtab_comp_unit. */
5994 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5995 const gdb_byte *info_ptr,
5996 struct die_info *comp_unit_die,
6000 struct dwarf2_cu *cu = reader->cu;
6001 struct objfile *objfile = cu->objfile;
6002 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6003 struct attribute *attr;
6005 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6006 struct partial_symtab *pst;
6008 const char *filename;
6009 struct process_psymtab_comp_unit_data *info = data;
6011 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6014 gdb_assert (! per_cu->is_debug_types);
6016 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6018 cu->list_in_scope = &file_symbols;
6020 /* Allocate a new partial symbol table structure. */
6021 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
6022 if (attr == NULL || !DW_STRING (attr))
6025 filename = DW_STRING (attr);
6027 pst = create_partial_symtab (per_cu, filename);
6029 /* This must be done before calling dwarf2_build_include_psymtabs. */
6030 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
6032 pst->dirname = DW_STRING (attr);
6034 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6036 dwarf2_find_base_address (comp_unit_die, cu);
6038 /* Possibly set the default values of LOWPC and HIGHPC from
6040 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6041 &best_highpc, cu, pst);
6042 if (has_pc_info == 1 && best_lowpc < best_highpc)
6043 /* Store the contiguous range if it is not empty; it can be empty for
6044 CUs with no code. */
6045 addrmap_set_empty (objfile->psymtabs_addrmap,
6046 best_lowpc + baseaddr,
6047 best_highpc + baseaddr - 1, pst);
6049 /* Check if comp unit has_children.
6050 If so, read the rest of the partial symbols from this comp unit.
6051 If not, there's no more debug_info for this comp unit. */
6054 struct partial_die_info *first_die;
6055 CORE_ADDR lowpc, highpc;
6057 lowpc = ((CORE_ADDR) -1);
6058 highpc = ((CORE_ADDR) 0);
6060 first_die = load_partial_dies (reader, info_ptr, 1);
6062 scan_partial_symbols (first_die, &lowpc, &highpc,
6065 /* If we didn't find a lowpc, set it to highpc to avoid
6066 complaints from `maint check'. */
6067 if (lowpc == ((CORE_ADDR) -1))
6070 /* If the compilation unit didn't have an explicit address range,
6071 then use the information extracted from its child dies. */
6075 best_highpc = highpc;
6078 pst->textlow = best_lowpc + baseaddr;
6079 pst->texthigh = best_highpc + baseaddr;
6081 pst->n_global_syms = objfile->global_psymbols.next -
6082 (objfile->global_psymbols.list + pst->globals_offset);
6083 pst->n_static_syms = objfile->static_psymbols.next -
6084 (objfile->static_psymbols.list + pst->statics_offset);
6085 sort_pst_symbols (objfile, pst);
6087 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6090 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6091 struct dwarf2_per_cu_data *iter;
6093 /* Fill in 'dependencies' here; we fill in 'users' in a
6095 pst->number_of_dependencies = len;
6096 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
6097 len * sizeof (struct symtab *));
6099 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6102 pst->dependencies[i] = iter->v.psymtab;
6104 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6107 /* Get the list of files included in the current compilation unit,
6108 and build a psymtab for each of them. */
6109 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6111 if (dwarf2_read_debug)
6113 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6115 fprintf_unfiltered (gdb_stdlog,
6116 "Psymtab for %s unit @0x%x: %s - %s"
6117 ", %d global, %d static syms\n",
6118 per_cu->is_debug_types ? "type" : "comp",
6119 per_cu->offset.sect_off,
6120 paddress (gdbarch, pst->textlow),
6121 paddress (gdbarch, pst->texthigh),
6122 pst->n_global_syms, pst->n_static_syms);
6126 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6127 Process compilation unit THIS_CU for a psymtab. */
6130 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6131 int want_partial_unit,
6132 enum language pretend_language)
6134 struct process_psymtab_comp_unit_data info;
6136 /* If this compilation unit was already read in, free the
6137 cached copy in order to read it in again. This is
6138 necessary because we skipped some symbols when we first
6139 read in the compilation unit (see load_partial_dies).
6140 This problem could be avoided, but the benefit is unclear. */
6141 if (this_cu->cu != NULL)
6142 free_one_cached_comp_unit (this_cu);
6144 gdb_assert (! this_cu->is_debug_types);
6145 info.want_partial_unit = want_partial_unit;
6146 info.pretend_language = pretend_language;
6147 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6148 process_psymtab_comp_unit_reader,
6151 /* Age out any secondary CUs. */
6152 age_cached_comp_units ();
6155 /* Reader function for build_type_psymtabs. */
6158 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6159 const gdb_byte *info_ptr,
6160 struct die_info *type_unit_die,
6164 struct objfile *objfile = dwarf2_per_objfile->objfile;
6165 struct dwarf2_cu *cu = reader->cu;
6166 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6167 struct signatured_type *sig_type;
6168 struct type_unit_group *tu_group;
6169 struct attribute *attr;
6170 struct partial_die_info *first_die;
6171 CORE_ADDR lowpc, highpc;
6172 struct partial_symtab *pst;
6174 gdb_assert (data == NULL);
6175 gdb_assert (per_cu->is_debug_types);
6176 sig_type = (struct signatured_type *) per_cu;
6181 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6182 tu_group = get_type_unit_group (cu, attr);
6184 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6186 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6187 cu->list_in_scope = &file_symbols;
6188 pst = create_partial_symtab (per_cu, "");
6191 first_die = load_partial_dies (reader, info_ptr, 1);
6193 lowpc = (CORE_ADDR) -1;
6194 highpc = (CORE_ADDR) 0;
6195 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6197 pst->n_global_syms = objfile->global_psymbols.next -
6198 (objfile->global_psymbols.list + pst->globals_offset);
6199 pst->n_static_syms = objfile->static_psymbols.next -
6200 (objfile->static_psymbols.list + pst->statics_offset);
6201 sort_pst_symbols (objfile, pst);
6204 /* Traversal function for build_type_psymtabs. */
6207 build_type_psymtab_dependencies (void **slot, void *info)
6209 struct objfile *objfile = dwarf2_per_objfile->objfile;
6210 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6211 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6212 struct partial_symtab *pst = per_cu->v.psymtab;
6213 int len = VEC_length (sig_type_ptr, tu_group->tus);
6214 struct signatured_type *iter;
6217 gdb_assert (len > 0);
6218 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6220 pst->number_of_dependencies = len;
6221 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
6222 len * sizeof (struct psymtab *));
6224 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6227 gdb_assert (iter->per_cu.is_debug_types);
6228 pst->dependencies[i] = iter->per_cu.v.psymtab;
6229 iter->type_unit_group = tu_group;
6232 VEC_free (sig_type_ptr, tu_group->tus);
6237 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6238 Build partial symbol tables for the .debug_types comp-units. */
6241 build_type_psymtabs (struct objfile *objfile)
6243 if (! create_all_type_units (objfile))
6246 build_type_unit_groups (build_type_psymtabs_reader, NULL);
6248 /* Now that all TUs have been processed we can fill in the dependencies. */
6249 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6250 build_type_psymtab_dependencies, NULL);
6253 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6256 psymtabs_addrmap_cleanup (void *o)
6258 struct objfile *objfile = o;
6260 objfile->psymtabs_addrmap = NULL;
6263 /* Compute the 'user' field for each psymtab in OBJFILE. */
6266 set_partial_user (struct objfile *objfile)
6270 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6272 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6273 struct partial_symtab *pst = per_cu->v.psymtab;
6279 for (j = 0; j < pst->number_of_dependencies; ++j)
6281 /* Set the 'user' field only if it is not already set. */
6282 if (pst->dependencies[j]->user == NULL)
6283 pst->dependencies[j]->user = pst;
6288 /* Build the partial symbol table by doing a quick pass through the
6289 .debug_info and .debug_abbrev sections. */
6292 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6294 struct cleanup *back_to, *addrmap_cleanup;
6295 struct obstack temp_obstack;
6298 if (dwarf2_read_debug)
6300 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6301 objfile_name (objfile));
6304 dwarf2_per_objfile->reading_partial_symbols = 1;
6306 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6308 /* Any cached compilation units will be linked by the per-objfile
6309 read_in_chain. Make sure to free them when we're done. */
6310 back_to = make_cleanup (free_cached_comp_units, NULL);
6312 build_type_psymtabs (objfile);
6314 create_all_comp_units (objfile);
6316 /* Create a temporary address map on a temporary obstack. We later
6317 copy this to the final obstack. */
6318 obstack_init (&temp_obstack);
6319 make_cleanup_obstack_free (&temp_obstack);
6320 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6321 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6323 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6325 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6327 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6330 set_partial_user (objfile);
6332 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6333 &objfile->objfile_obstack);
6334 discard_cleanups (addrmap_cleanup);
6336 do_cleanups (back_to);
6338 if (dwarf2_read_debug)
6339 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6340 objfile_name (objfile));
6343 /* die_reader_func for load_partial_comp_unit. */
6346 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6347 const gdb_byte *info_ptr,
6348 struct die_info *comp_unit_die,
6352 struct dwarf2_cu *cu = reader->cu;
6354 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6356 /* Check if comp unit has_children.
6357 If so, read the rest of the partial symbols from this comp unit.
6358 If not, there's no more debug_info for this comp unit. */
6360 load_partial_dies (reader, info_ptr, 0);
6363 /* Load the partial DIEs for a secondary CU into memory.
6364 This is also used when rereading a primary CU with load_all_dies. */
6367 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6369 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6370 load_partial_comp_unit_reader, NULL);
6374 read_comp_units_from_section (struct objfile *objfile,
6375 struct dwarf2_section_info *section,
6376 unsigned int is_dwz,
6379 struct dwarf2_per_cu_data ***all_comp_units)
6381 const gdb_byte *info_ptr;
6382 bfd *abfd = get_section_bfd_owner (section);
6384 if (dwarf2_read_debug)
6385 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6386 get_section_name (section),
6387 get_section_file_name (section));
6389 dwarf2_read_section (objfile, section);
6391 info_ptr = section->buffer;
6393 while (info_ptr < section->buffer + section->size)
6395 unsigned int length, initial_length_size;
6396 struct dwarf2_per_cu_data *this_cu;
6399 offset.sect_off = info_ptr - section->buffer;
6401 /* Read just enough information to find out where the next
6402 compilation unit is. */
6403 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6405 /* Save the compilation unit for later lookup. */
6406 this_cu = obstack_alloc (&objfile->objfile_obstack,
6407 sizeof (struct dwarf2_per_cu_data));
6408 memset (this_cu, 0, sizeof (*this_cu));
6409 this_cu->offset = offset;
6410 this_cu->length = length + initial_length_size;
6411 this_cu->is_dwz = is_dwz;
6412 this_cu->objfile = objfile;
6413 this_cu->section = section;
6415 if (*n_comp_units == *n_allocated)
6418 *all_comp_units = xrealloc (*all_comp_units,
6420 * sizeof (struct dwarf2_per_cu_data *));
6422 (*all_comp_units)[*n_comp_units] = this_cu;
6425 info_ptr = info_ptr + this_cu->length;
6429 /* Create a list of all compilation units in OBJFILE.
6430 This is only done for -readnow and building partial symtabs. */
6433 create_all_comp_units (struct objfile *objfile)
6437 struct dwarf2_per_cu_data **all_comp_units;
6438 struct dwz_file *dwz;
6442 all_comp_units = xmalloc (n_allocated
6443 * sizeof (struct dwarf2_per_cu_data *));
6445 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6446 &n_allocated, &n_comp_units, &all_comp_units);
6448 dwz = dwarf2_get_dwz_file ();
6450 read_comp_units_from_section (objfile, &dwz->info, 1,
6451 &n_allocated, &n_comp_units,
6454 dwarf2_per_objfile->all_comp_units
6455 = obstack_alloc (&objfile->objfile_obstack,
6456 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6457 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6458 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6459 xfree (all_comp_units);
6460 dwarf2_per_objfile->n_comp_units = n_comp_units;
6463 /* Process all loaded DIEs for compilation unit CU, starting at
6464 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6465 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6466 DW_AT_ranges). If NEED_PC is set, then this function will set
6467 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6468 and record the covered ranges in the addrmap. */
6471 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6472 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6474 struct partial_die_info *pdi;
6476 /* Now, march along the PDI's, descending into ones which have
6477 interesting children but skipping the children of the other ones,
6478 until we reach the end of the compilation unit. */
6484 fixup_partial_die (pdi, cu);
6486 /* Anonymous namespaces or modules have no name but have interesting
6487 children, so we need to look at them. Ditto for anonymous
6490 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6491 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6492 || pdi->tag == DW_TAG_imported_unit)
6496 case DW_TAG_subprogram:
6497 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6499 case DW_TAG_constant:
6500 case DW_TAG_variable:
6501 case DW_TAG_typedef:
6502 case DW_TAG_union_type:
6503 if (!pdi->is_declaration)
6505 add_partial_symbol (pdi, cu);
6508 case DW_TAG_class_type:
6509 case DW_TAG_interface_type:
6510 case DW_TAG_structure_type:
6511 if (!pdi->is_declaration)
6513 add_partial_symbol (pdi, cu);
6516 case DW_TAG_enumeration_type:
6517 if (!pdi->is_declaration)
6518 add_partial_enumeration (pdi, cu);
6520 case DW_TAG_base_type:
6521 case DW_TAG_subrange_type:
6522 /* File scope base type definitions are added to the partial
6524 add_partial_symbol (pdi, cu);
6526 case DW_TAG_namespace:
6527 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6530 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6532 case DW_TAG_imported_unit:
6534 struct dwarf2_per_cu_data *per_cu;
6536 /* For now we don't handle imported units in type units. */
6537 if (cu->per_cu->is_debug_types)
6539 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6540 " supported in type units [in module %s]"),
6541 objfile_name (cu->objfile));
6544 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6548 /* Go read the partial unit, if needed. */
6549 if (per_cu->v.psymtab == NULL)
6550 process_psymtab_comp_unit (per_cu, 1, cu->language);
6552 VEC_safe_push (dwarf2_per_cu_ptr,
6553 cu->per_cu->imported_symtabs, per_cu);
6556 case DW_TAG_imported_declaration:
6557 add_partial_symbol (pdi, cu);
6564 /* If the die has a sibling, skip to the sibling. */
6566 pdi = pdi->die_sibling;
6570 /* Functions used to compute the fully scoped name of a partial DIE.
6572 Normally, this is simple. For C++, the parent DIE's fully scoped
6573 name is concatenated with "::" and the partial DIE's name. For
6574 Java, the same thing occurs except that "." is used instead of "::".
6575 Enumerators are an exception; they use the scope of their parent
6576 enumeration type, i.e. the name of the enumeration type is not
6577 prepended to the enumerator.
6579 There are two complexities. One is DW_AT_specification; in this
6580 case "parent" means the parent of the target of the specification,
6581 instead of the direct parent of the DIE. The other is compilers
6582 which do not emit DW_TAG_namespace; in this case we try to guess
6583 the fully qualified name of structure types from their members'
6584 linkage names. This must be done using the DIE's children rather
6585 than the children of any DW_AT_specification target. We only need
6586 to do this for structures at the top level, i.e. if the target of
6587 any DW_AT_specification (if any; otherwise the DIE itself) does not
6590 /* Compute the scope prefix associated with PDI's parent, in
6591 compilation unit CU. The result will be allocated on CU's
6592 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6593 field. NULL is returned if no prefix is necessary. */
6595 partial_die_parent_scope (struct partial_die_info *pdi,
6596 struct dwarf2_cu *cu)
6598 const char *grandparent_scope;
6599 struct partial_die_info *parent, *real_pdi;
6601 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6602 then this means the parent of the specification DIE. */
6605 while (real_pdi->has_specification)
6606 real_pdi = find_partial_die (real_pdi->spec_offset,
6607 real_pdi->spec_is_dwz, cu);
6609 parent = real_pdi->die_parent;
6613 if (parent->scope_set)
6614 return parent->scope;
6616 fixup_partial_die (parent, cu);
6618 grandparent_scope = partial_die_parent_scope (parent, cu);
6620 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6621 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6622 Work around this problem here. */
6623 if (cu->language == language_cplus
6624 && parent->tag == DW_TAG_namespace
6625 && strcmp (parent->name, "::") == 0
6626 && grandparent_scope == NULL)
6628 parent->scope = NULL;
6629 parent->scope_set = 1;
6633 if (pdi->tag == DW_TAG_enumerator)
6634 /* Enumerators should not get the name of the enumeration as a prefix. */
6635 parent->scope = grandparent_scope;
6636 else if (parent->tag == DW_TAG_namespace
6637 || parent->tag == DW_TAG_module
6638 || parent->tag == DW_TAG_structure_type
6639 || parent->tag == DW_TAG_class_type
6640 || parent->tag == DW_TAG_interface_type
6641 || parent->tag == DW_TAG_union_type
6642 || parent->tag == DW_TAG_enumeration_type)
6644 if (grandparent_scope == NULL)
6645 parent->scope = parent->name;
6647 parent->scope = typename_concat (&cu->comp_unit_obstack,
6649 parent->name, 0, cu);
6653 /* FIXME drow/2004-04-01: What should we be doing with
6654 function-local names? For partial symbols, we should probably be
6656 complaint (&symfile_complaints,
6657 _("unhandled containing DIE tag %d for DIE at %d"),
6658 parent->tag, pdi->offset.sect_off);
6659 parent->scope = grandparent_scope;
6662 parent->scope_set = 1;
6663 return parent->scope;
6666 /* Return the fully scoped name associated with PDI, from compilation unit
6667 CU. The result will be allocated with malloc. */
6670 partial_die_full_name (struct partial_die_info *pdi,
6671 struct dwarf2_cu *cu)
6673 const char *parent_scope;
6675 /* If this is a template instantiation, we can not work out the
6676 template arguments from partial DIEs. So, unfortunately, we have
6677 to go through the full DIEs. At least any work we do building
6678 types here will be reused if full symbols are loaded later. */
6679 if (pdi->has_template_arguments)
6681 fixup_partial_die (pdi, cu);
6683 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6685 struct die_info *die;
6686 struct attribute attr;
6687 struct dwarf2_cu *ref_cu = cu;
6689 /* DW_FORM_ref_addr is using section offset. */
6691 attr.form = DW_FORM_ref_addr;
6692 attr.u.unsnd = pdi->offset.sect_off;
6693 die = follow_die_ref (NULL, &attr, &ref_cu);
6695 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6699 parent_scope = partial_die_parent_scope (pdi, cu);
6700 if (parent_scope == NULL)
6703 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6707 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6709 struct objfile *objfile = cu->objfile;
6711 const char *actual_name = NULL;
6713 char *built_actual_name;
6715 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6717 built_actual_name = partial_die_full_name (pdi, cu);
6718 if (built_actual_name != NULL)
6719 actual_name = built_actual_name;
6721 if (actual_name == NULL)
6722 actual_name = pdi->name;
6726 case DW_TAG_subprogram:
6727 if (pdi->is_external || cu->language == language_ada)
6729 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6730 of the global scope. But in Ada, we want to be able to access
6731 nested procedures globally. So all Ada subprograms are stored
6732 in the global scope. */
6733 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6734 mst_text, objfile); */
6735 add_psymbol_to_list (actual_name, strlen (actual_name),
6736 built_actual_name != NULL,
6737 VAR_DOMAIN, LOC_BLOCK,
6738 &objfile->global_psymbols,
6739 0, pdi->lowpc + baseaddr,
6740 cu->language, objfile);
6744 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6745 mst_file_text, objfile); */
6746 add_psymbol_to_list (actual_name, strlen (actual_name),
6747 built_actual_name != NULL,
6748 VAR_DOMAIN, LOC_BLOCK,
6749 &objfile->static_psymbols,
6750 0, pdi->lowpc + baseaddr,
6751 cu->language, objfile);
6754 case DW_TAG_constant:
6756 struct psymbol_allocation_list *list;
6758 if (pdi->is_external)
6759 list = &objfile->global_psymbols;
6761 list = &objfile->static_psymbols;
6762 add_psymbol_to_list (actual_name, strlen (actual_name),
6763 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6764 list, 0, 0, cu->language, objfile);
6767 case DW_TAG_variable:
6769 addr = decode_locdesc (pdi->d.locdesc, cu);
6773 && !dwarf2_per_objfile->has_section_at_zero)
6775 /* A global or static variable may also have been stripped
6776 out by the linker if unused, in which case its address
6777 will be nullified; do not add such variables into partial
6778 symbol table then. */
6780 else if (pdi->is_external)
6783 Don't enter into the minimal symbol tables as there is
6784 a minimal symbol table entry from the ELF symbols already.
6785 Enter into partial symbol table if it has a location
6786 descriptor or a type.
6787 If the location descriptor is missing, new_symbol will create
6788 a LOC_UNRESOLVED symbol, the address of the variable will then
6789 be determined from the minimal symbol table whenever the variable
6791 The address for the partial symbol table entry is not
6792 used by GDB, but it comes in handy for debugging partial symbol
6795 if (pdi->d.locdesc || pdi->has_type)
6796 add_psymbol_to_list (actual_name, strlen (actual_name),
6797 built_actual_name != NULL,
6798 VAR_DOMAIN, LOC_STATIC,
6799 &objfile->global_psymbols,
6801 cu->language, objfile);
6805 /* Static Variable. Skip symbols without location descriptors. */
6806 if (pdi->d.locdesc == NULL)
6808 xfree (built_actual_name);
6811 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6812 mst_file_data, objfile); */
6813 add_psymbol_to_list (actual_name, strlen (actual_name),
6814 built_actual_name != NULL,
6815 VAR_DOMAIN, LOC_STATIC,
6816 &objfile->static_psymbols,
6818 cu->language, objfile);
6821 case DW_TAG_typedef:
6822 case DW_TAG_base_type:
6823 case DW_TAG_subrange_type:
6824 add_psymbol_to_list (actual_name, strlen (actual_name),
6825 built_actual_name != NULL,
6826 VAR_DOMAIN, LOC_TYPEDEF,
6827 &objfile->static_psymbols,
6828 0, (CORE_ADDR) 0, cu->language, objfile);
6830 case DW_TAG_imported_declaration:
6831 case DW_TAG_namespace:
6832 add_psymbol_to_list (actual_name, strlen (actual_name),
6833 built_actual_name != NULL,
6834 VAR_DOMAIN, LOC_TYPEDEF,
6835 &objfile->global_psymbols,
6836 0, (CORE_ADDR) 0, cu->language, objfile);
6839 add_psymbol_to_list (actual_name, strlen (actual_name),
6840 built_actual_name != NULL,
6841 MODULE_DOMAIN, LOC_TYPEDEF,
6842 &objfile->global_psymbols,
6843 0, (CORE_ADDR) 0, cu->language, objfile);
6845 case DW_TAG_class_type:
6846 case DW_TAG_interface_type:
6847 case DW_TAG_structure_type:
6848 case DW_TAG_union_type:
6849 case DW_TAG_enumeration_type:
6850 /* Skip external references. The DWARF standard says in the section
6851 about "Structure, Union, and Class Type Entries": "An incomplete
6852 structure, union or class type is represented by a structure,
6853 union or class entry that does not have a byte size attribute
6854 and that has a DW_AT_declaration attribute." */
6855 if (!pdi->has_byte_size && pdi->is_declaration)
6857 xfree (built_actual_name);
6861 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6862 static vs. global. */
6863 add_psymbol_to_list (actual_name, strlen (actual_name),
6864 built_actual_name != NULL,
6865 STRUCT_DOMAIN, LOC_TYPEDEF,
6866 (cu->language == language_cplus
6867 || cu->language == language_java)
6868 ? &objfile->global_psymbols
6869 : &objfile->static_psymbols,
6870 0, (CORE_ADDR) 0, cu->language, objfile);
6873 case DW_TAG_enumerator:
6874 add_psymbol_to_list (actual_name, strlen (actual_name),
6875 built_actual_name != NULL,
6876 VAR_DOMAIN, LOC_CONST,
6877 (cu->language == language_cplus
6878 || cu->language == language_java)
6879 ? &objfile->global_psymbols
6880 : &objfile->static_psymbols,
6881 0, (CORE_ADDR) 0, cu->language, objfile);
6887 xfree (built_actual_name);
6890 /* Read a partial die corresponding to a namespace; also, add a symbol
6891 corresponding to that namespace to the symbol table. NAMESPACE is
6892 the name of the enclosing namespace. */
6895 add_partial_namespace (struct partial_die_info *pdi,
6896 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6897 int need_pc, struct dwarf2_cu *cu)
6899 /* Add a symbol for the namespace. */
6901 add_partial_symbol (pdi, cu);
6903 /* Now scan partial symbols in that namespace. */
6905 if (pdi->has_children)
6906 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6909 /* Read a partial die corresponding to a Fortran module. */
6912 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6913 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6915 /* Add a symbol for the namespace. */
6917 add_partial_symbol (pdi, cu);
6919 /* Now scan partial symbols in that module. */
6921 if (pdi->has_children)
6922 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6925 /* Read a partial die corresponding to a subprogram and create a partial
6926 symbol for that subprogram. When the CU language allows it, this
6927 routine also defines a partial symbol for each nested subprogram
6928 that this subprogram contains.
6930 DIE my also be a lexical block, in which case we simply search
6931 recursively for suprograms defined inside that lexical block.
6932 Again, this is only performed when the CU language allows this
6933 type of definitions. */
6936 add_partial_subprogram (struct partial_die_info *pdi,
6937 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6938 int need_pc, struct dwarf2_cu *cu)
6940 if (pdi->tag == DW_TAG_subprogram)
6942 if (pdi->has_pc_info)
6944 if (pdi->lowpc < *lowpc)
6945 *lowpc = pdi->lowpc;
6946 if (pdi->highpc > *highpc)
6947 *highpc = pdi->highpc;
6951 struct objfile *objfile = cu->objfile;
6953 baseaddr = ANOFFSET (objfile->section_offsets,
6954 SECT_OFF_TEXT (objfile));
6955 addrmap_set_empty (objfile->psymtabs_addrmap,
6956 pdi->lowpc + baseaddr,
6957 pdi->highpc - 1 + baseaddr,
6958 cu->per_cu->v.psymtab);
6962 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6964 if (!pdi->is_declaration)
6965 /* Ignore subprogram DIEs that do not have a name, they are
6966 illegal. Do not emit a complaint at this point, we will
6967 do so when we convert this psymtab into a symtab. */
6969 add_partial_symbol (pdi, cu);
6973 if (! pdi->has_children)
6976 if (cu->language == language_ada)
6978 pdi = pdi->die_child;
6981 fixup_partial_die (pdi, cu);
6982 if (pdi->tag == DW_TAG_subprogram
6983 || pdi->tag == DW_TAG_lexical_block)
6984 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6985 pdi = pdi->die_sibling;
6990 /* Read a partial die corresponding to an enumeration type. */
6993 add_partial_enumeration (struct partial_die_info *enum_pdi,
6994 struct dwarf2_cu *cu)
6996 struct partial_die_info *pdi;
6998 if (enum_pdi->name != NULL)
6999 add_partial_symbol (enum_pdi, cu);
7001 pdi = enum_pdi->die_child;
7004 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7005 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7007 add_partial_symbol (pdi, cu);
7008 pdi = pdi->die_sibling;
7012 /* Return the initial uleb128 in the die at INFO_PTR. */
7015 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7017 unsigned int bytes_read;
7019 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7022 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7023 Return the corresponding abbrev, or NULL if the number is zero (indicating
7024 an empty DIE). In either case *BYTES_READ will be set to the length of
7025 the initial number. */
7027 static struct abbrev_info *
7028 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7029 struct dwarf2_cu *cu)
7031 bfd *abfd = cu->objfile->obfd;
7032 unsigned int abbrev_number;
7033 struct abbrev_info *abbrev;
7035 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7037 if (abbrev_number == 0)
7040 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7043 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
7044 abbrev_number, bfd_get_filename (abfd));
7050 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7051 Returns a pointer to the end of a series of DIEs, terminated by an empty
7052 DIE. Any children of the skipped DIEs will also be skipped. */
7054 static const gdb_byte *
7055 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7057 struct dwarf2_cu *cu = reader->cu;
7058 struct abbrev_info *abbrev;
7059 unsigned int bytes_read;
7063 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7065 return info_ptr + bytes_read;
7067 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7071 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7072 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7073 abbrev corresponding to that skipped uleb128 should be passed in
7074 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7077 static const gdb_byte *
7078 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7079 struct abbrev_info *abbrev)
7081 unsigned int bytes_read;
7082 struct attribute attr;
7083 bfd *abfd = reader->abfd;
7084 struct dwarf2_cu *cu = reader->cu;
7085 const gdb_byte *buffer = reader->buffer;
7086 const gdb_byte *buffer_end = reader->buffer_end;
7087 const gdb_byte *start_info_ptr = info_ptr;
7088 unsigned int form, i;
7090 for (i = 0; i < abbrev->num_attrs; i++)
7092 /* The only abbrev we care about is DW_AT_sibling. */
7093 if (abbrev->attrs[i].name == DW_AT_sibling)
7095 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7096 if (attr.form == DW_FORM_ref_addr)
7097 complaint (&symfile_complaints,
7098 _("ignoring absolute DW_AT_sibling"));
7101 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
7102 const gdb_byte *sibling_ptr = buffer + off;
7104 if (sibling_ptr < info_ptr)
7105 complaint (&symfile_complaints,
7106 _("DW_AT_sibling points backwards"));
7107 else if (sibling_ptr > reader->buffer_end)
7108 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7114 /* If it isn't DW_AT_sibling, skip this attribute. */
7115 form = abbrev->attrs[i].form;
7119 case DW_FORM_ref_addr:
7120 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7121 and later it is offset sized. */
7122 if (cu->header.version == 2)
7123 info_ptr += cu->header.addr_size;
7125 info_ptr += cu->header.offset_size;
7127 case DW_FORM_GNU_ref_alt:
7128 info_ptr += cu->header.offset_size;
7131 info_ptr += cu->header.addr_size;
7138 case DW_FORM_flag_present:
7150 case DW_FORM_ref_sig8:
7153 case DW_FORM_string:
7154 read_direct_string (abfd, info_ptr, &bytes_read);
7155 info_ptr += bytes_read;
7157 case DW_FORM_sec_offset:
7159 case DW_FORM_GNU_strp_alt:
7160 info_ptr += cu->header.offset_size;
7162 case DW_FORM_exprloc:
7164 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7165 info_ptr += bytes_read;
7167 case DW_FORM_block1:
7168 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7170 case DW_FORM_block2:
7171 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7173 case DW_FORM_block4:
7174 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7178 case DW_FORM_ref_udata:
7179 case DW_FORM_GNU_addr_index:
7180 case DW_FORM_GNU_str_index:
7181 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7183 case DW_FORM_indirect:
7184 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7185 info_ptr += bytes_read;
7186 /* We need to continue parsing from here, so just go back to
7188 goto skip_attribute;
7191 error (_("Dwarf Error: Cannot handle %s "
7192 "in DWARF reader [in module %s]"),
7193 dwarf_form_name (form),
7194 bfd_get_filename (abfd));
7198 if (abbrev->has_children)
7199 return skip_children (reader, info_ptr);
7204 /* Locate ORIG_PDI's sibling.
7205 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7207 static const gdb_byte *
7208 locate_pdi_sibling (const struct die_reader_specs *reader,
7209 struct partial_die_info *orig_pdi,
7210 const gdb_byte *info_ptr)
7212 /* Do we know the sibling already? */
7214 if (orig_pdi->sibling)
7215 return orig_pdi->sibling;
7217 /* Are there any children to deal with? */
7219 if (!orig_pdi->has_children)
7222 /* Skip the children the long way. */
7224 return skip_children (reader, info_ptr);
7227 /* Expand this partial symbol table into a full symbol table. SELF is
7231 dwarf2_read_symtab (struct partial_symtab *self,
7232 struct objfile *objfile)
7236 warning (_("bug: psymtab for %s is already read in."),
7243 printf_filtered (_("Reading in symbols for %s..."),
7245 gdb_flush (gdb_stdout);
7248 /* Restore our global data. */
7249 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
7251 /* If this psymtab is constructed from a debug-only objfile, the
7252 has_section_at_zero flag will not necessarily be correct. We
7253 can get the correct value for this flag by looking at the data
7254 associated with the (presumably stripped) associated objfile. */
7255 if (objfile->separate_debug_objfile_backlink)
7257 struct dwarf2_per_objfile *dpo_backlink
7258 = objfile_data (objfile->separate_debug_objfile_backlink,
7259 dwarf2_objfile_data_key);
7261 dwarf2_per_objfile->has_section_at_zero
7262 = dpo_backlink->has_section_at_zero;
7265 dwarf2_per_objfile->reading_partial_symbols = 0;
7267 psymtab_to_symtab_1 (self);
7269 /* Finish up the debug error message. */
7271 printf_filtered (_("done.\n"));
7274 process_cu_includes ();
7277 /* Reading in full CUs. */
7279 /* Add PER_CU to the queue. */
7282 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7283 enum language pretend_language)
7285 struct dwarf2_queue_item *item;
7288 item = xmalloc (sizeof (*item));
7289 item->per_cu = per_cu;
7290 item->pretend_language = pretend_language;
7293 if (dwarf2_queue == NULL)
7294 dwarf2_queue = item;
7296 dwarf2_queue_tail->next = item;
7298 dwarf2_queue_tail = item;
7301 /* If PER_CU is not yet queued, add it to the queue.
7302 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7304 The result is non-zero if PER_CU was queued, otherwise the result is zero
7305 meaning either PER_CU is already queued or it is already loaded.
7307 N.B. There is an invariant here that if a CU is queued then it is loaded.
7308 The caller is required to load PER_CU if we return non-zero. */
7311 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7312 struct dwarf2_per_cu_data *per_cu,
7313 enum language pretend_language)
7315 /* We may arrive here during partial symbol reading, if we need full
7316 DIEs to process an unusual case (e.g. template arguments). Do
7317 not queue PER_CU, just tell our caller to load its DIEs. */
7318 if (dwarf2_per_objfile->reading_partial_symbols)
7320 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7325 /* Mark the dependence relation so that we don't flush PER_CU
7327 if (dependent_cu != NULL)
7328 dwarf2_add_dependence (dependent_cu, per_cu);
7330 /* If it's already on the queue, we have nothing to do. */
7334 /* If the compilation unit is already loaded, just mark it as
7336 if (per_cu->cu != NULL)
7338 per_cu->cu->last_used = 0;
7342 /* Add it to the queue. */
7343 queue_comp_unit (per_cu, pretend_language);
7348 /* Process the queue. */
7351 process_queue (void)
7353 struct dwarf2_queue_item *item, *next_item;
7355 if (dwarf2_read_debug)
7357 fprintf_unfiltered (gdb_stdlog,
7358 "Expanding one or more symtabs of objfile %s ...\n",
7359 objfile_name (dwarf2_per_objfile->objfile));
7362 /* The queue starts out with one item, but following a DIE reference
7363 may load a new CU, adding it to the end of the queue. */
7364 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7366 if (dwarf2_per_objfile->using_index
7367 ? !item->per_cu->v.quick->symtab
7368 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7370 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7371 unsigned int debug_print_threshold;
7374 if (per_cu->is_debug_types)
7376 struct signatured_type *sig_type =
7377 (struct signatured_type *) per_cu;
7379 sprintf (buf, "TU %s at offset 0x%x",
7380 hex_string (sig_type->signature),
7381 per_cu->offset.sect_off);
7382 /* There can be 100s of TUs.
7383 Only print them in verbose mode. */
7384 debug_print_threshold = 2;
7388 sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off);
7389 debug_print_threshold = 1;
7392 if (dwarf2_read_debug >= debug_print_threshold)
7393 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7395 if (per_cu->is_debug_types)
7396 process_full_type_unit (per_cu, item->pretend_language);
7398 process_full_comp_unit (per_cu, item->pretend_language);
7400 if (dwarf2_read_debug >= debug_print_threshold)
7401 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7404 item->per_cu->queued = 0;
7405 next_item = item->next;
7409 dwarf2_queue_tail = NULL;
7411 if (dwarf2_read_debug)
7413 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7414 objfile_name (dwarf2_per_objfile->objfile));
7418 /* Free all allocated queue entries. This function only releases anything if
7419 an error was thrown; if the queue was processed then it would have been
7420 freed as we went along. */
7423 dwarf2_release_queue (void *dummy)
7425 struct dwarf2_queue_item *item, *last;
7427 item = dwarf2_queue;
7430 /* Anything still marked queued is likely to be in an
7431 inconsistent state, so discard it. */
7432 if (item->per_cu->queued)
7434 if (item->per_cu->cu != NULL)
7435 free_one_cached_comp_unit (item->per_cu);
7436 item->per_cu->queued = 0;
7444 dwarf2_queue = dwarf2_queue_tail = NULL;
7447 /* Read in full symbols for PST, and anything it depends on. */
7450 psymtab_to_symtab_1 (struct partial_symtab *pst)
7452 struct dwarf2_per_cu_data *per_cu;
7458 for (i = 0; i < pst->number_of_dependencies; i++)
7459 if (!pst->dependencies[i]->readin
7460 && pst->dependencies[i]->user == NULL)
7462 /* Inform about additional files that need to be read in. */
7465 /* FIXME: i18n: Need to make this a single string. */
7466 fputs_filtered (" ", gdb_stdout);
7468 fputs_filtered ("and ", gdb_stdout);
7470 printf_filtered ("%s...", pst->dependencies[i]->filename);
7471 wrap_here (""); /* Flush output. */
7472 gdb_flush (gdb_stdout);
7474 psymtab_to_symtab_1 (pst->dependencies[i]);
7477 per_cu = pst->read_symtab_private;
7481 /* It's an include file, no symbols to read for it.
7482 Everything is in the parent symtab. */
7487 dw2_do_instantiate_symtab (per_cu);
7490 /* Trivial hash function for die_info: the hash value of a DIE
7491 is its offset in .debug_info for this objfile. */
7494 die_hash (const void *item)
7496 const struct die_info *die = item;
7498 return die->offset.sect_off;
7501 /* Trivial comparison function for die_info structures: two DIEs
7502 are equal if they have the same offset. */
7505 die_eq (const void *item_lhs, const void *item_rhs)
7507 const struct die_info *die_lhs = item_lhs;
7508 const struct die_info *die_rhs = item_rhs;
7510 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7513 /* die_reader_func for load_full_comp_unit.
7514 This is identical to read_signatured_type_reader,
7515 but is kept separate for now. */
7518 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7519 const gdb_byte *info_ptr,
7520 struct die_info *comp_unit_die,
7524 struct dwarf2_cu *cu = reader->cu;
7525 enum language *language_ptr = data;
7527 gdb_assert (cu->die_hash == NULL);
7529 htab_create_alloc_ex (cu->header.length / 12,
7533 &cu->comp_unit_obstack,
7534 hashtab_obstack_allocate,
7535 dummy_obstack_deallocate);
7538 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7539 &info_ptr, comp_unit_die);
7540 cu->dies = comp_unit_die;
7541 /* comp_unit_die is not stored in die_hash, no need. */
7543 /* We try not to read any attributes in this function, because not
7544 all CUs needed for references have been loaded yet, and symbol
7545 table processing isn't initialized. But we have to set the CU language,
7546 or we won't be able to build types correctly.
7547 Similarly, if we do not read the producer, we can not apply
7548 producer-specific interpretation. */
7549 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7552 /* Load the DIEs associated with PER_CU into memory. */
7555 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7556 enum language pretend_language)
7558 gdb_assert (! this_cu->is_debug_types);
7560 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7561 load_full_comp_unit_reader, &pretend_language);
7564 /* Add a DIE to the delayed physname list. */
7567 add_to_method_list (struct type *type, int fnfield_index, int index,
7568 const char *name, struct die_info *die,
7569 struct dwarf2_cu *cu)
7571 struct delayed_method_info mi;
7573 mi.fnfield_index = fnfield_index;
7577 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7580 /* A cleanup for freeing the delayed method list. */
7583 free_delayed_list (void *ptr)
7585 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7586 if (cu->method_list != NULL)
7588 VEC_free (delayed_method_info, cu->method_list);
7589 cu->method_list = NULL;
7593 /* Compute the physnames of any methods on the CU's method list.
7595 The computation of method physnames is delayed in order to avoid the
7596 (bad) condition that one of the method's formal parameters is of an as yet
7600 compute_delayed_physnames (struct dwarf2_cu *cu)
7603 struct delayed_method_info *mi;
7604 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7606 const char *physname;
7607 struct fn_fieldlist *fn_flp
7608 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7609 physname = dwarf2_physname (mi->name, mi->die, cu);
7610 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7614 /* Go objects should be embedded in a DW_TAG_module DIE,
7615 and it's not clear if/how imported objects will appear.
7616 To keep Go support simple until that's worked out,
7617 go back through what we've read and create something usable.
7618 We could do this while processing each DIE, and feels kinda cleaner,
7619 but that way is more invasive.
7620 This is to, for example, allow the user to type "p var" or "b main"
7621 without having to specify the package name, and allow lookups
7622 of module.object to work in contexts that use the expression
7626 fixup_go_packaging (struct dwarf2_cu *cu)
7628 char *package_name = NULL;
7629 struct pending *list;
7632 for (list = global_symbols; list != NULL; list = list->next)
7634 for (i = 0; i < list->nsyms; ++i)
7636 struct symbol *sym = list->symbol[i];
7638 if (SYMBOL_LANGUAGE (sym) == language_go
7639 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7641 char *this_package_name = go_symbol_package_name (sym);
7643 if (this_package_name == NULL)
7645 if (package_name == NULL)
7646 package_name = this_package_name;
7649 if (strcmp (package_name, this_package_name) != 0)
7650 complaint (&symfile_complaints,
7651 _("Symtab %s has objects from two different Go packages: %s and %s"),
7652 (SYMBOL_SYMTAB (sym)
7653 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7654 : objfile_name (cu->objfile)),
7655 this_package_name, package_name);
7656 xfree (this_package_name);
7662 if (package_name != NULL)
7664 struct objfile *objfile = cu->objfile;
7665 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7667 strlen (package_name));
7668 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7669 saved_package_name, objfile);
7672 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7674 sym = allocate_symbol (objfile);
7675 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7676 SYMBOL_SET_NAMES (sym, saved_package_name,
7677 strlen (saved_package_name), 0, objfile);
7678 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7679 e.g., "main" finds the "main" module and not C's main(). */
7680 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7681 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7682 SYMBOL_TYPE (sym) = type;
7684 add_symbol_to_list (sym, &global_symbols);
7686 xfree (package_name);
7690 /* Return the symtab for PER_CU. This works properly regardless of
7691 whether we're using the index or psymtabs. */
7693 static struct symtab *
7694 get_symtab (struct dwarf2_per_cu_data *per_cu)
7696 return (dwarf2_per_objfile->using_index
7697 ? per_cu->v.quick->symtab
7698 : per_cu->v.psymtab->symtab);
7701 /* A helper function for computing the list of all symbol tables
7702 included by PER_CU. */
7705 recursively_compute_inclusions (VEC (symtab_ptr) **result,
7706 htab_t all_children, htab_t all_type_symtabs,
7707 struct dwarf2_per_cu_data *per_cu,
7708 struct symtab *immediate_parent)
7712 struct symtab *symtab;
7713 struct dwarf2_per_cu_data *iter;
7715 slot = htab_find_slot (all_children, per_cu, INSERT);
7718 /* This inclusion and its children have been processed. */
7723 /* Only add a CU if it has a symbol table. */
7724 symtab = get_symtab (per_cu);
7727 /* If this is a type unit only add its symbol table if we haven't
7728 seen it yet (type unit per_cu's can share symtabs). */
7729 if (per_cu->is_debug_types)
7731 slot = htab_find_slot (all_type_symtabs, symtab, INSERT);
7735 VEC_safe_push (symtab_ptr, *result, symtab);
7736 if (symtab->user == NULL)
7737 symtab->user = immediate_parent;
7742 VEC_safe_push (symtab_ptr, *result, symtab);
7743 if (symtab->user == NULL)
7744 symtab->user = immediate_parent;
7749 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7752 recursively_compute_inclusions (result, all_children,
7753 all_type_symtabs, iter, symtab);
7757 /* Compute the symtab 'includes' fields for the symtab related to
7761 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7763 gdb_assert (! per_cu->is_debug_types);
7765 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7768 struct dwarf2_per_cu_data *per_cu_iter;
7769 struct symtab *symtab_iter;
7770 VEC (symtab_ptr) *result_symtabs = NULL;
7771 htab_t all_children, all_type_symtabs;
7772 struct symtab *symtab = get_symtab (per_cu);
7774 /* If we don't have a symtab, we can just skip this case. */
7778 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7779 NULL, xcalloc, xfree);
7780 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7781 NULL, xcalloc, xfree);
7784 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7788 recursively_compute_inclusions (&result_symtabs, all_children,
7789 all_type_symtabs, per_cu_iter,
7793 /* Now we have a transitive closure of all the included symtabs. */
7794 len = VEC_length (symtab_ptr, result_symtabs);
7796 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7797 (len + 1) * sizeof (struct symtab *));
7799 VEC_iterate (symtab_ptr, result_symtabs, ix, symtab_iter);
7801 symtab->includes[ix] = symtab_iter;
7802 symtab->includes[len] = NULL;
7804 VEC_free (symtab_ptr, result_symtabs);
7805 htab_delete (all_children);
7806 htab_delete (all_type_symtabs);
7810 /* Compute the 'includes' field for the symtabs of all the CUs we just
7814 process_cu_includes (void)
7817 struct dwarf2_per_cu_data *iter;
7820 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7824 if (! iter->is_debug_types)
7825 compute_symtab_includes (iter);
7828 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7831 /* Generate full symbol information for PER_CU, whose DIEs have
7832 already been loaded into memory. */
7835 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7836 enum language pretend_language)
7838 struct dwarf2_cu *cu = per_cu->cu;
7839 struct objfile *objfile = per_cu->objfile;
7840 CORE_ADDR lowpc, highpc;
7841 struct symtab *symtab;
7842 struct cleanup *back_to, *delayed_list_cleanup;
7844 struct block *static_block;
7846 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7849 back_to = make_cleanup (really_free_pendings, NULL);
7850 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7852 cu->list_in_scope = &file_symbols;
7854 cu->language = pretend_language;
7855 cu->language_defn = language_def (cu->language);
7857 /* Do line number decoding in read_file_scope () */
7858 process_die (cu->dies, cu);
7860 /* For now fudge the Go package. */
7861 if (cu->language == language_go)
7862 fixup_go_packaging (cu);
7864 /* Now that we have processed all the DIEs in the CU, all the types
7865 should be complete, and it should now be safe to compute all of the
7867 compute_delayed_physnames (cu);
7868 do_cleanups (delayed_list_cleanup);
7870 /* Some compilers don't define a DW_AT_high_pc attribute for the
7871 compilation unit. If the DW_AT_high_pc is missing, synthesize
7872 it, by scanning the DIE's below the compilation unit. */
7873 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7876 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7878 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7879 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7880 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7881 addrmap to help ensure it has an accurate map of pc values belonging to
7883 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7885 symtab = end_symtab_from_static_block (static_block, objfile,
7886 SECT_OFF_TEXT (objfile), 0);
7890 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7892 /* Set symtab language to language from DW_AT_language. If the
7893 compilation is from a C file generated by language preprocessors, do
7894 not set the language if it was already deduced by start_subfile. */
7895 if (!(cu->language == language_c && symtab->language != language_c))
7896 symtab->language = cu->language;
7898 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7899 produce DW_AT_location with location lists but it can be possibly
7900 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7901 there were bugs in prologue debug info, fixed later in GCC-4.5
7902 by "unwind info for epilogues" patch (which is not directly related).
7904 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7905 needed, it would be wrong due to missing DW_AT_producer there.
7907 Still one can confuse GDB by using non-standard GCC compilation
7908 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7910 if (cu->has_loclist && gcc_4_minor >= 5)
7911 symtab->locations_valid = 1;
7913 if (gcc_4_minor >= 5)
7914 symtab->epilogue_unwind_valid = 1;
7916 symtab->call_site_htab = cu->call_site_htab;
7919 if (dwarf2_per_objfile->using_index)
7920 per_cu->v.quick->symtab = symtab;
7923 struct partial_symtab *pst = per_cu->v.psymtab;
7924 pst->symtab = symtab;
7928 /* Push it for inclusion processing later. */
7929 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7931 do_cleanups (back_to);
7934 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7935 already been loaded into memory. */
7938 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7939 enum language pretend_language)
7941 struct dwarf2_cu *cu = per_cu->cu;
7942 struct objfile *objfile = per_cu->objfile;
7943 struct symtab *symtab;
7944 struct cleanup *back_to, *delayed_list_cleanup;
7945 struct signatured_type *sig_type;
7947 gdb_assert (per_cu->is_debug_types);
7948 sig_type = (struct signatured_type *) per_cu;
7951 back_to = make_cleanup (really_free_pendings, NULL);
7952 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7954 cu->list_in_scope = &file_symbols;
7956 cu->language = pretend_language;
7957 cu->language_defn = language_def (cu->language);
7959 /* The symbol tables are set up in read_type_unit_scope. */
7960 process_die (cu->dies, cu);
7962 /* For now fudge the Go package. */
7963 if (cu->language == language_go)
7964 fixup_go_packaging (cu);
7966 /* Now that we have processed all the DIEs in the CU, all the types
7967 should be complete, and it should now be safe to compute all of the
7969 compute_delayed_physnames (cu);
7970 do_cleanups (delayed_list_cleanup);
7972 /* TUs share symbol tables.
7973 If this is the first TU to use this symtab, complete the construction
7974 of it with end_expandable_symtab. Otherwise, complete the addition of
7975 this TU's symbols to the existing symtab. */
7976 if (sig_type->type_unit_group->primary_symtab == NULL)
7978 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7979 sig_type->type_unit_group->primary_symtab = symtab;
7983 /* Set symtab language to language from DW_AT_language. If the
7984 compilation is from a C file generated by language preprocessors,
7985 do not set the language if it was already deduced by
7987 if (!(cu->language == language_c && symtab->language != language_c))
7988 symtab->language = cu->language;
7993 augment_type_symtab (objfile,
7994 sig_type->type_unit_group->primary_symtab);
7995 symtab = sig_type->type_unit_group->primary_symtab;
7998 if (dwarf2_per_objfile->using_index)
7999 per_cu->v.quick->symtab = symtab;
8002 struct partial_symtab *pst = per_cu->v.psymtab;
8003 pst->symtab = symtab;
8007 do_cleanups (back_to);
8010 /* Process an imported unit DIE. */
8013 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8015 struct attribute *attr;
8017 /* For now we don't handle imported units in type units. */
8018 if (cu->per_cu->is_debug_types)
8020 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8021 " supported in type units [in module %s]"),
8022 objfile_name (cu->objfile));
8025 attr = dwarf2_attr (die, DW_AT_import, cu);
8028 struct dwarf2_per_cu_data *per_cu;
8029 struct symtab *imported_symtab;
8033 offset = dwarf2_get_ref_die_offset (attr);
8034 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8035 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
8037 /* If necessary, add it to the queue and load its DIEs. */
8038 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8039 load_full_comp_unit (per_cu, cu->language);
8041 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8046 /* Reset the in_process bit of a die. */
8049 reset_die_in_process (void *arg)
8051 struct die_info *die = arg;
8053 die->in_process = 0;
8056 /* Process a die and its children. */
8059 process_die (struct die_info *die, struct dwarf2_cu *cu)
8061 struct cleanup *in_process;
8063 /* We should only be processing those not already in process. */
8064 gdb_assert (!die->in_process);
8066 die->in_process = 1;
8067 in_process = make_cleanup (reset_die_in_process,die);
8071 case DW_TAG_padding:
8073 case DW_TAG_compile_unit:
8074 case DW_TAG_partial_unit:
8075 read_file_scope (die, cu);
8077 case DW_TAG_type_unit:
8078 read_type_unit_scope (die, cu);
8080 case DW_TAG_subprogram:
8081 case DW_TAG_inlined_subroutine:
8082 read_func_scope (die, cu);
8084 case DW_TAG_lexical_block:
8085 case DW_TAG_try_block:
8086 case DW_TAG_catch_block:
8087 read_lexical_block_scope (die, cu);
8089 case DW_TAG_GNU_call_site:
8090 read_call_site_scope (die, cu);
8092 case DW_TAG_class_type:
8093 case DW_TAG_interface_type:
8094 case DW_TAG_structure_type:
8095 case DW_TAG_union_type:
8096 process_structure_scope (die, cu);
8098 case DW_TAG_enumeration_type:
8099 process_enumeration_scope (die, cu);
8102 /* These dies have a type, but processing them does not create
8103 a symbol or recurse to process the children. Therefore we can
8104 read them on-demand through read_type_die. */
8105 case DW_TAG_subroutine_type:
8106 case DW_TAG_set_type:
8107 case DW_TAG_array_type:
8108 case DW_TAG_pointer_type:
8109 case DW_TAG_ptr_to_member_type:
8110 case DW_TAG_reference_type:
8111 case DW_TAG_string_type:
8114 case DW_TAG_base_type:
8115 case DW_TAG_subrange_type:
8116 case DW_TAG_typedef:
8117 /* Add a typedef symbol for the type definition, if it has a
8119 new_symbol (die, read_type_die (die, cu), cu);
8121 case DW_TAG_common_block:
8122 read_common_block (die, cu);
8124 case DW_TAG_common_inclusion:
8126 case DW_TAG_namespace:
8127 cu->processing_has_namespace_info = 1;
8128 read_namespace (die, cu);
8131 cu->processing_has_namespace_info = 1;
8132 read_module (die, cu);
8134 case DW_TAG_imported_declaration:
8135 cu->processing_has_namespace_info = 1;
8136 if (read_namespace_alias (die, cu))
8138 /* The declaration is not a global namespace alias: fall through. */
8139 case DW_TAG_imported_module:
8140 cu->processing_has_namespace_info = 1;
8141 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8142 || cu->language != language_fortran))
8143 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8144 dwarf_tag_name (die->tag));
8145 read_import_statement (die, cu);
8148 case DW_TAG_imported_unit:
8149 process_imported_unit_die (die, cu);
8153 new_symbol (die, NULL, cu);
8157 do_cleanups (in_process);
8160 /* DWARF name computation. */
8162 /* A helper function for dwarf2_compute_name which determines whether DIE
8163 needs to have the name of the scope prepended to the name listed in the
8167 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8169 struct attribute *attr;
8173 case DW_TAG_namespace:
8174 case DW_TAG_typedef:
8175 case DW_TAG_class_type:
8176 case DW_TAG_interface_type:
8177 case DW_TAG_structure_type:
8178 case DW_TAG_union_type:
8179 case DW_TAG_enumeration_type:
8180 case DW_TAG_enumerator:
8181 case DW_TAG_subprogram:
8183 case DW_TAG_imported_declaration:
8186 case DW_TAG_variable:
8187 case DW_TAG_constant:
8188 /* We only need to prefix "globally" visible variables. These include
8189 any variable marked with DW_AT_external or any variable that
8190 lives in a namespace. [Variables in anonymous namespaces
8191 require prefixing, but they are not DW_AT_external.] */
8193 if (dwarf2_attr (die, DW_AT_specification, cu))
8195 struct dwarf2_cu *spec_cu = cu;
8197 return die_needs_namespace (die_specification (die, &spec_cu),
8201 attr = dwarf2_attr (die, DW_AT_external, cu);
8202 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8203 && die->parent->tag != DW_TAG_module)
8205 /* A variable in a lexical block of some kind does not need a
8206 namespace, even though in C++ such variables may be external
8207 and have a mangled name. */
8208 if (die->parent->tag == DW_TAG_lexical_block
8209 || die->parent->tag == DW_TAG_try_block
8210 || die->parent->tag == DW_TAG_catch_block
8211 || die->parent->tag == DW_TAG_subprogram)
8220 /* Retrieve the last character from a mem_file. */
8223 do_ui_file_peek_last (void *object, const char *buffer, long length)
8225 char *last_char_p = (char *) object;
8228 *last_char_p = buffer[length - 1];
8231 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8232 compute the physname for the object, which include a method's:
8233 - formal parameters (C++/Java),
8234 - receiver type (Go),
8235 - return type (Java).
8237 The term "physname" is a bit confusing.
8238 For C++, for example, it is the demangled name.
8239 For Go, for example, it's the mangled name.
8241 For Ada, return the DIE's linkage name rather than the fully qualified
8242 name. PHYSNAME is ignored..
8244 The result is allocated on the objfile_obstack and canonicalized. */
8247 dwarf2_compute_name (const char *name,
8248 struct die_info *die, struct dwarf2_cu *cu,
8251 struct objfile *objfile = cu->objfile;
8254 name = dwarf2_name (die, cu);
8256 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
8257 compute it by typename_concat inside GDB. */
8258 if (cu->language == language_ada
8259 || (cu->language == language_fortran && physname))
8261 /* For Ada unit, we prefer the linkage name over the name, as
8262 the former contains the exported name, which the user expects
8263 to be able to reference. Ideally, we want the user to be able
8264 to reference this entity using either natural or linkage name,
8265 but we haven't started looking at this enhancement yet. */
8266 struct attribute *attr;
8268 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8270 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8271 if (attr && DW_STRING (attr))
8272 return DW_STRING (attr);
8275 /* These are the only languages we know how to qualify names in. */
8277 && (cu->language == language_cplus || cu->language == language_java
8278 || cu->language == language_fortran))
8280 if (die_needs_namespace (die, cu))
8284 struct ui_file *buf;
8286 prefix = determine_prefix (die, cu);
8287 buf = mem_fileopen ();
8288 if (*prefix != '\0')
8290 char *prefixed_name = typename_concat (NULL, prefix, name,
8293 fputs_unfiltered (prefixed_name, buf);
8294 xfree (prefixed_name);
8297 fputs_unfiltered (name, buf);
8299 /* Template parameters may be specified in the DIE's DW_AT_name, or
8300 as children with DW_TAG_template_type_param or
8301 DW_TAG_value_type_param. If the latter, add them to the name
8302 here. If the name already has template parameters, then
8303 skip this step; some versions of GCC emit both, and
8304 it is more efficient to use the pre-computed name.
8306 Something to keep in mind about this process: it is very
8307 unlikely, or in some cases downright impossible, to produce
8308 something that will match the mangled name of a function.
8309 If the definition of the function has the same debug info,
8310 we should be able to match up with it anyway. But fallbacks
8311 using the minimal symbol, for instance to find a method
8312 implemented in a stripped copy of libstdc++, will not work.
8313 If we do not have debug info for the definition, we will have to
8314 match them up some other way.
8316 When we do name matching there is a related problem with function
8317 templates; two instantiated function templates are allowed to
8318 differ only by their return types, which we do not add here. */
8320 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8322 struct attribute *attr;
8323 struct die_info *child;
8326 die->building_fullname = 1;
8328 for (child = die->child; child != NULL; child = child->sibling)
8332 const gdb_byte *bytes;
8333 struct dwarf2_locexpr_baton *baton;
8336 if (child->tag != DW_TAG_template_type_param
8337 && child->tag != DW_TAG_template_value_param)
8342 fputs_unfiltered ("<", buf);
8346 fputs_unfiltered (", ", buf);
8348 attr = dwarf2_attr (child, DW_AT_type, cu);
8351 complaint (&symfile_complaints,
8352 _("template parameter missing DW_AT_type"));
8353 fputs_unfiltered ("UNKNOWN_TYPE", buf);
8356 type = die_type (child, cu);
8358 if (child->tag == DW_TAG_template_type_param)
8360 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
8364 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8367 complaint (&symfile_complaints,
8368 _("template parameter missing "
8369 "DW_AT_const_value"));
8370 fputs_unfiltered ("UNKNOWN_VALUE", buf);
8374 dwarf2_const_value_attr (attr, type, name,
8375 &cu->comp_unit_obstack, cu,
8376 &value, &bytes, &baton);
8378 if (TYPE_NOSIGN (type))
8379 /* GDB prints characters as NUMBER 'CHAR'. If that's
8380 changed, this can use value_print instead. */
8381 c_printchar (value, type, buf);
8384 struct value_print_options opts;
8387 v = dwarf2_evaluate_loc_desc (type, NULL,
8391 else if (bytes != NULL)
8393 v = allocate_value (type);
8394 memcpy (value_contents_writeable (v), bytes,
8395 TYPE_LENGTH (type));
8398 v = value_from_longest (type, value);
8400 /* Specify decimal so that we do not depend on
8402 get_formatted_print_options (&opts, 'd');
8404 value_print (v, buf, &opts);
8410 die->building_fullname = 0;
8414 /* Close the argument list, with a space if necessary
8415 (nested templates). */
8416 char last_char = '\0';
8417 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8418 if (last_char == '>')
8419 fputs_unfiltered (" >", buf);
8421 fputs_unfiltered (">", buf);
8425 /* For Java and C++ methods, append formal parameter type
8426 information, if PHYSNAME. */
8428 if (physname && die->tag == DW_TAG_subprogram
8429 && (cu->language == language_cplus
8430 || cu->language == language_java))
8432 struct type *type = read_type_die (die, cu);
8434 c_type_print_args (type, buf, 1, cu->language,
8435 &type_print_raw_options);
8437 if (cu->language == language_java)
8439 /* For java, we must append the return type to method
8441 if (die->tag == DW_TAG_subprogram)
8442 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8443 0, 0, &type_print_raw_options);
8445 else if (cu->language == language_cplus)
8447 /* Assume that an artificial first parameter is
8448 "this", but do not crash if it is not. RealView
8449 marks unnamed (and thus unused) parameters as
8450 artificial; there is no way to differentiate
8452 if (TYPE_NFIELDS (type) > 0
8453 && TYPE_FIELD_ARTIFICIAL (type, 0)
8454 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8455 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8457 fputs_unfiltered (" const", buf);
8461 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8463 ui_file_delete (buf);
8465 if (cu->language == language_cplus)
8468 = dwarf2_canonicalize_name (name, cu,
8469 &objfile->objfile_obstack);
8480 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8481 If scope qualifiers are appropriate they will be added. The result
8482 will be allocated on the objfile_obstack, or NULL if the DIE does
8483 not have a name. NAME may either be from a previous call to
8484 dwarf2_name or NULL.
8486 The output string will be canonicalized (if C++/Java). */
8489 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8491 return dwarf2_compute_name (name, die, cu, 0);
8494 /* Construct a physname for the given DIE in CU. NAME may either be
8495 from a previous call to dwarf2_name or NULL. The result will be
8496 allocated on the objfile_objstack or NULL if the DIE does not have a
8499 The output string will be canonicalized (if C++/Java). */
8502 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8504 struct objfile *objfile = cu->objfile;
8505 struct attribute *attr;
8506 const char *retval, *mangled = NULL, *canon = NULL;
8507 struct cleanup *back_to;
8510 /* In this case dwarf2_compute_name is just a shortcut not building anything
8512 if (!die_needs_namespace (die, cu))
8513 return dwarf2_compute_name (name, die, cu, 1);
8515 back_to = make_cleanup (null_cleanup, NULL);
8517 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8519 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8521 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8523 if (attr && DW_STRING (attr))
8527 mangled = DW_STRING (attr);
8529 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8530 type. It is easier for GDB users to search for such functions as
8531 `name(params)' than `long name(params)'. In such case the minimal
8532 symbol names do not match the full symbol names but for template
8533 functions there is never a need to look up their definition from their
8534 declaration so the only disadvantage remains the minimal symbol
8535 variant `long name(params)' does not have the proper inferior type.
8538 if (cu->language == language_go)
8540 /* This is a lie, but we already lie to the caller new_symbol_full.
8541 new_symbol_full assumes we return the mangled name.
8542 This just undoes that lie until things are cleaned up. */
8547 demangled = gdb_demangle (mangled,
8548 (DMGL_PARAMS | DMGL_ANSI
8549 | (cu->language == language_java
8550 ? DMGL_JAVA | DMGL_RET_POSTFIX
8555 make_cleanup (xfree, demangled);
8565 if (canon == NULL || check_physname)
8567 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8569 if (canon != NULL && strcmp (physname, canon) != 0)
8571 /* It may not mean a bug in GDB. The compiler could also
8572 compute DW_AT_linkage_name incorrectly. But in such case
8573 GDB would need to be bug-to-bug compatible. */
8575 complaint (&symfile_complaints,
8576 _("Computed physname <%s> does not match demangled <%s> "
8577 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8578 physname, canon, mangled, die->offset.sect_off,
8579 objfile_name (objfile));
8581 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8582 is available here - over computed PHYSNAME. It is safer
8583 against both buggy GDB and buggy compilers. */
8597 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8599 do_cleanups (back_to);
8603 /* Inspect DIE in CU for a namespace alias. If one exists, record
8604 a new symbol for it.
8606 Returns 1 if a namespace alias was recorded, 0 otherwise. */
8609 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
8611 struct attribute *attr;
8613 /* If the die does not have a name, this is not a namespace
8615 attr = dwarf2_attr (die, DW_AT_name, cu);
8619 struct die_info *d = die;
8620 struct dwarf2_cu *imported_cu = cu;
8622 /* If the compiler has nested DW_AT_imported_declaration DIEs,
8623 keep inspecting DIEs until we hit the underlying import. */
8624 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
8625 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
8627 attr = dwarf2_attr (d, DW_AT_import, cu);
8631 d = follow_die_ref (d, attr, &imported_cu);
8632 if (d->tag != DW_TAG_imported_declaration)
8636 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
8638 complaint (&symfile_complaints,
8639 _("DIE at 0x%x has too many recursively imported "
8640 "declarations"), d->offset.sect_off);
8647 sect_offset offset = dwarf2_get_ref_die_offset (attr);
8649 type = get_die_type_at_offset (offset, cu->per_cu);
8650 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
8652 /* This declaration is a global namespace alias. Add
8653 a symbol for it whose type is the aliased namespace. */
8654 new_symbol (die, type, cu);
8663 /* Read the import statement specified by the given die and record it. */
8666 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8668 struct objfile *objfile = cu->objfile;
8669 struct attribute *import_attr;
8670 struct die_info *imported_die, *child_die;
8671 struct dwarf2_cu *imported_cu;
8672 const char *imported_name;
8673 const char *imported_name_prefix;
8674 const char *canonical_name;
8675 const char *import_alias;
8676 const char *imported_declaration = NULL;
8677 const char *import_prefix;
8678 VEC (const_char_ptr) *excludes = NULL;
8679 struct cleanup *cleanups;
8681 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8682 if (import_attr == NULL)
8684 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8685 dwarf_tag_name (die->tag));
8690 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8691 imported_name = dwarf2_name (imported_die, imported_cu);
8692 if (imported_name == NULL)
8694 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8696 The import in the following code:
8710 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8711 <52> DW_AT_decl_file : 1
8712 <53> DW_AT_decl_line : 6
8713 <54> DW_AT_import : <0x75>
8714 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8716 <5b> DW_AT_decl_file : 1
8717 <5c> DW_AT_decl_line : 2
8718 <5d> DW_AT_type : <0x6e>
8720 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8721 <76> DW_AT_byte_size : 4
8722 <77> DW_AT_encoding : 5 (signed)
8724 imports the wrong die ( 0x75 instead of 0x58 ).
8725 This case will be ignored until the gcc bug is fixed. */
8729 /* Figure out the local name after import. */
8730 import_alias = dwarf2_name (die, cu);
8732 /* Figure out where the statement is being imported to. */
8733 import_prefix = determine_prefix (die, cu);
8735 /* Figure out what the scope of the imported die is and prepend it
8736 to the name of the imported die. */
8737 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8739 if (imported_die->tag != DW_TAG_namespace
8740 && imported_die->tag != DW_TAG_module)
8742 imported_declaration = imported_name;
8743 canonical_name = imported_name_prefix;
8745 else if (strlen (imported_name_prefix) > 0)
8746 canonical_name = obconcat (&objfile->objfile_obstack,
8747 imported_name_prefix, "::", imported_name,
8750 canonical_name = imported_name;
8752 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8754 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8755 for (child_die = die->child; child_die && child_die->tag;
8756 child_die = sibling_die (child_die))
8758 /* DWARF-4: A Fortran use statement with a “rename list” may be
8759 represented by an imported module entry with an import attribute
8760 referring to the module and owned entries corresponding to those
8761 entities that are renamed as part of being imported. */
8763 if (child_die->tag != DW_TAG_imported_declaration)
8765 complaint (&symfile_complaints,
8766 _("child DW_TAG_imported_declaration expected "
8767 "- DIE at 0x%x [in module %s]"),
8768 child_die->offset.sect_off, objfile_name (objfile));
8772 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8773 if (import_attr == NULL)
8775 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8776 dwarf_tag_name (child_die->tag));
8781 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8783 imported_name = dwarf2_name (imported_die, imported_cu);
8784 if (imported_name == NULL)
8786 complaint (&symfile_complaints,
8787 _("child DW_TAG_imported_declaration has unknown "
8788 "imported name - DIE at 0x%x [in module %s]"),
8789 child_die->offset.sect_off, objfile_name (objfile));
8793 VEC_safe_push (const_char_ptr, excludes, imported_name);
8795 process_die (child_die, cu);
8798 cp_add_using_directive (import_prefix,
8801 imported_declaration,
8804 &objfile->objfile_obstack);
8806 do_cleanups (cleanups);
8809 /* Cleanup function for handle_DW_AT_stmt_list. */
8812 free_cu_line_header (void *arg)
8814 struct dwarf2_cu *cu = arg;
8816 free_line_header (cu->line_header);
8817 cu->line_header = NULL;
8820 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8821 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8822 this, it was first present in GCC release 4.3.0. */
8825 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8827 if (!cu->checked_producer)
8828 check_producer (cu);
8830 return cu->producer_is_gcc_lt_4_3;
8834 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8835 const char **name, const char **comp_dir)
8837 struct attribute *attr;
8842 /* Find the filename. Do not use dwarf2_name here, since the filename
8843 is not a source language identifier. */
8844 attr = dwarf2_attr (die, DW_AT_name, cu);
8847 *name = DW_STRING (attr);
8850 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8852 *comp_dir = DW_STRING (attr);
8853 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8854 && IS_ABSOLUTE_PATH (*name))
8856 char *d = ldirname (*name);
8860 make_cleanup (xfree, d);
8862 if (*comp_dir != NULL)
8864 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8865 directory, get rid of it. */
8866 char *cp = strchr (*comp_dir, ':');
8868 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8873 *name = "<unknown>";
8876 /* Handle DW_AT_stmt_list for a compilation unit.
8877 DIE is the DW_TAG_compile_unit die for CU.
8878 COMP_DIR is the compilation directory.
8879 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8882 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8883 const char *comp_dir) /* ARI: editCase function */
8885 struct attribute *attr;
8887 gdb_assert (! cu->per_cu->is_debug_types);
8889 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8892 unsigned int line_offset = DW_UNSND (attr);
8893 struct line_header *line_header
8894 = dwarf_decode_line_header (line_offset, cu);
8898 cu->line_header = line_header;
8899 make_cleanup (free_cu_line_header, cu);
8900 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8905 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8908 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8910 struct objfile *objfile = dwarf2_per_objfile->objfile;
8911 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8912 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8913 CORE_ADDR highpc = ((CORE_ADDR) 0);
8914 struct attribute *attr;
8915 const char *name = NULL;
8916 const char *comp_dir = NULL;
8917 struct die_info *child_die;
8918 bfd *abfd = objfile->obfd;
8921 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8923 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8925 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8926 from finish_block. */
8927 if (lowpc == ((CORE_ADDR) -1))
8932 find_file_and_directory (die, cu, &name, &comp_dir);
8934 prepare_one_comp_unit (cu, die, cu->language);
8936 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8937 standardised yet. As a workaround for the language detection we fall
8938 back to the DW_AT_producer string. */
8939 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8940 cu->language = language_opencl;
8942 /* Similar hack for Go. */
8943 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8944 set_cu_language (DW_LANG_Go, cu);
8946 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8948 /* Decode line number information if present. We do this before
8949 processing child DIEs, so that the line header table is available
8950 for DW_AT_decl_file. */
8951 handle_DW_AT_stmt_list (die, cu, comp_dir);
8953 /* Process all dies in compilation unit. */
8954 if (die->child != NULL)
8956 child_die = die->child;
8957 while (child_die && child_die->tag)
8959 process_die (child_die, cu);
8960 child_die = sibling_die (child_die);
8964 /* Decode macro information, if present. Dwarf 2 macro information
8965 refers to information in the line number info statement program
8966 header, so we can only read it if we've read the header
8968 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8969 if (attr && cu->line_header)
8971 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8972 complaint (&symfile_complaints,
8973 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8975 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8979 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8980 if (attr && cu->line_header)
8982 unsigned int macro_offset = DW_UNSND (attr);
8984 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8988 do_cleanups (back_to);
8991 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8992 Create the set of symtabs used by this TU, or if this TU is sharing
8993 symtabs with another TU and the symtabs have already been created
8994 then restore those symtabs in the line header.
8995 We don't need the pc/line-number mapping for type units. */
8998 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9000 struct objfile *objfile = dwarf2_per_objfile->objfile;
9001 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9002 struct type_unit_group *tu_group;
9004 struct line_header *lh;
9005 struct attribute *attr;
9006 unsigned int i, line_offset;
9007 struct signatured_type *sig_type;
9009 gdb_assert (per_cu->is_debug_types);
9010 sig_type = (struct signatured_type *) per_cu;
9012 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9014 /* If we're using .gdb_index (includes -readnow) then
9015 per_cu->type_unit_group may not have been set up yet. */
9016 if (sig_type->type_unit_group == NULL)
9017 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9018 tu_group = sig_type->type_unit_group;
9020 /* If we've already processed this stmt_list there's no real need to
9021 do it again, we could fake it and just recreate the part we need
9022 (file name,index -> symtab mapping). If data shows this optimization
9023 is useful we can do it then. */
9024 first_time = tu_group->primary_symtab == NULL;
9026 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9031 line_offset = DW_UNSND (attr);
9032 lh = dwarf_decode_line_header (line_offset, cu);
9037 dwarf2_start_symtab (cu, "", NULL, 0);
9040 gdb_assert (tu_group->symtabs == NULL);
9043 /* Note: The primary symtab will get allocated at the end. */
9047 cu->line_header = lh;
9048 make_cleanup (free_cu_line_header, cu);
9052 dwarf2_start_symtab (cu, "", NULL, 0);
9054 tu_group->num_symtabs = lh->num_file_names;
9055 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
9057 for (i = 0; i < lh->num_file_names; ++i)
9059 const char *dir = NULL;
9060 struct file_entry *fe = &lh->file_names[i];
9063 dir = lh->include_dirs[fe->dir_index - 1];
9064 dwarf2_start_subfile (fe->name, dir, NULL);
9066 /* Note: We don't have to watch for the main subfile here, type units
9067 don't have DW_AT_name. */
9069 if (current_subfile->symtab == NULL)
9071 /* NOTE: start_subfile will recognize when it's been passed
9072 a file it has already seen. So we can't assume there's a
9073 simple mapping from lh->file_names to subfiles,
9074 lh->file_names may contain dups. */
9075 current_subfile->symtab = allocate_symtab (current_subfile->name,
9079 fe->symtab = current_subfile->symtab;
9080 tu_group->symtabs[i] = fe->symtab;
9087 for (i = 0; i < lh->num_file_names; ++i)
9089 struct file_entry *fe = &lh->file_names[i];
9091 fe->symtab = tu_group->symtabs[i];
9095 /* The main symtab is allocated last. Type units don't have DW_AT_name
9096 so they don't have a "real" (so to speak) symtab anyway.
9097 There is later code that will assign the main symtab to all symbols
9098 that don't have one. We need to handle the case of a symbol with a
9099 missing symtab (DW_AT_decl_file) anyway. */
9102 /* Process DW_TAG_type_unit.
9103 For TUs we want to skip the first top level sibling if it's not the
9104 actual type being defined by this TU. In this case the first top
9105 level sibling is there to provide context only. */
9108 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9110 struct die_info *child_die;
9112 prepare_one_comp_unit (cu, die, language_minimal);
9114 /* Initialize (or reinitialize) the machinery for building symtabs.
9115 We do this before processing child DIEs, so that the line header table
9116 is available for DW_AT_decl_file. */
9117 setup_type_unit_groups (die, cu);
9119 if (die->child != NULL)
9121 child_die = die->child;
9122 while (child_die && child_die->tag)
9124 process_die (child_die, cu);
9125 child_die = sibling_die (child_die);
9132 http://gcc.gnu.org/wiki/DebugFission
9133 http://gcc.gnu.org/wiki/DebugFissionDWP
9135 To simplify handling of both DWO files ("object" files with the DWARF info)
9136 and DWP files (a file with the DWOs packaged up into one file), we treat
9137 DWP files as having a collection of virtual DWO files. */
9140 hash_dwo_file (const void *item)
9142 const struct dwo_file *dwo_file = item;
9145 hash = htab_hash_string (dwo_file->dwo_name);
9146 if (dwo_file->comp_dir != NULL)
9147 hash += htab_hash_string (dwo_file->comp_dir);
9152 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9154 const struct dwo_file *lhs = item_lhs;
9155 const struct dwo_file *rhs = item_rhs;
9157 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9159 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9160 return lhs->comp_dir == rhs->comp_dir;
9161 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9164 /* Allocate a hash table for DWO files. */
9167 allocate_dwo_file_hash_table (void)
9169 struct objfile *objfile = dwarf2_per_objfile->objfile;
9171 return htab_create_alloc_ex (41,
9175 &objfile->objfile_obstack,
9176 hashtab_obstack_allocate,
9177 dummy_obstack_deallocate);
9180 /* Lookup DWO file DWO_NAME. */
9183 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9185 struct dwo_file find_entry;
9188 if (dwarf2_per_objfile->dwo_files == NULL)
9189 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9191 memset (&find_entry, 0, sizeof (find_entry));
9192 find_entry.dwo_name = dwo_name;
9193 find_entry.comp_dir = comp_dir;
9194 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9200 hash_dwo_unit (const void *item)
9202 const struct dwo_unit *dwo_unit = item;
9204 /* This drops the top 32 bits of the id, but is ok for a hash. */
9205 return dwo_unit->signature;
9209 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9211 const struct dwo_unit *lhs = item_lhs;
9212 const struct dwo_unit *rhs = item_rhs;
9214 /* The signature is assumed to be unique within the DWO file.
9215 So while object file CU dwo_id's always have the value zero,
9216 that's OK, assuming each object file DWO file has only one CU,
9217 and that's the rule for now. */
9218 return lhs->signature == rhs->signature;
9221 /* Allocate a hash table for DWO CUs,TUs.
9222 There is one of these tables for each of CUs,TUs for each DWO file. */
9225 allocate_dwo_unit_table (struct objfile *objfile)
9227 /* Start out with a pretty small number.
9228 Generally DWO files contain only one CU and maybe some TUs. */
9229 return htab_create_alloc_ex (3,
9233 &objfile->objfile_obstack,
9234 hashtab_obstack_allocate,
9235 dummy_obstack_deallocate);
9238 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9240 struct create_dwo_cu_data
9242 struct dwo_file *dwo_file;
9243 struct dwo_unit dwo_unit;
9246 /* die_reader_func for create_dwo_cu. */
9249 create_dwo_cu_reader (const struct die_reader_specs *reader,
9250 const gdb_byte *info_ptr,
9251 struct die_info *comp_unit_die,
9255 struct dwarf2_cu *cu = reader->cu;
9256 struct objfile *objfile = dwarf2_per_objfile->objfile;
9257 sect_offset offset = cu->per_cu->offset;
9258 struct dwarf2_section_info *section = cu->per_cu->section;
9259 struct create_dwo_cu_data *data = datap;
9260 struct dwo_file *dwo_file = data->dwo_file;
9261 struct dwo_unit *dwo_unit = &data->dwo_unit;
9262 struct attribute *attr;
9264 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9267 complaint (&symfile_complaints,
9268 _("Dwarf Error: debug entry at offset 0x%x is missing"
9269 " its dwo_id [in module %s]"),
9270 offset.sect_off, dwo_file->dwo_name);
9274 dwo_unit->dwo_file = dwo_file;
9275 dwo_unit->signature = DW_UNSND (attr);
9276 dwo_unit->section = section;
9277 dwo_unit->offset = offset;
9278 dwo_unit->length = cu->per_cu->length;
9280 if (dwarf2_read_debug)
9281 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9282 offset.sect_off, hex_string (dwo_unit->signature));
9285 /* Create the dwo_unit for the lone CU in DWO_FILE.
9286 Note: This function processes DWO files only, not DWP files. */
9288 static struct dwo_unit *
9289 create_dwo_cu (struct dwo_file *dwo_file)
9291 struct objfile *objfile = dwarf2_per_objfile->objfile;
9292 struct dwarf2_section_info *section = &dwo_file->sections.info;
9295 const gdb_byte *info_ptr, *end_ptr;
9296 struct create_dwo_cu_data create_dwo_cu_data;
9297 struct dwo_unit *dwo_unit;
9299 dwarf2_read_section (objfile, section);
9300 info_ptr = section->buffer;
9302 if (info_ptr == NULL)
9305 /* We can't set abfd until now because the section may be empty or
9306 not present, in which case section->asection will be NULL. */
9307 abfd = get_section_bfd_owner (section);
9309 if (dwarf2_read_debug)
9311 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9312 get_section_name (section),
9313 get_section_file_name (section));
9316 create_dwo_cu_data.dwo_file = dwo_file;
9319 end_ptr = info_ptr + section->size;
9320 while (info_ptr < end_ptr)
9322 struct dwarf2_per_cu_data per_cu;
9324 memset (&create_dwo_cu_data.dwo_unit, 0,
9325 sizeof (create_dwo_cu_data.dwo_unit));
9326 memset (&per_cu, 0, sizeof (per_cu));
9327 per_cu.objfile = objfile;
9328 per_cu.is_debug_types = 0;
9329 per_cu.offset.sect_off = info_ptr - section->buffer;
9330 per_cu.section = section;
9332 init_cutu_and_read_dies_no_follow (&per_cu, dwo_file,
9333 create_dwo_cu_reader,
9334 &create_dwo_cu_data);
9336 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
9338 /* If we've already found one, complain. We only support one
9339 because having more than one requires hacking the dwo_name of
9340 each to match, which is highly unlikely to happen. */
9341 if (dwo_unit != NULL)
9343 complaint (&symfile_complaints,
9344 _("Multiple CUs in DWO file %s [in module %s]"),
9345 dwo_file->dwo_name, objfile_name (objfile));
9349 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9350 *dwo_unit = create_dwo_cu_data.dwo_unit;
9353 info_ptr += per_cu.length;
9359 /* DWP file .debug_{cu,tu}_index section format:
9360 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9364 Both index sections have the same format, and serve to map a 64-bit
9365 signature to a set of section numbers. Each section begins with a header,
9366 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9367 indexes, and a pool of 32-bit section numbers. The index sections will be
9368 aligned at 8-byte boundaries in the file.
9370 The index section header consists of:
9372 V, 32 bit version number
9374 N, 32 bit number of compilation units or type units in the index
9375 M, 32 bit number of slots in the hash table
9377 Numbers are recorded using the byte order of the application binary.
9379 The hash table begins at offset 16 in the section, and consists of an array
9380 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9381 order of the application binary). Unused slots in the hash table are 0.
9382 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9384 The parallel table begins immediately after the hash table
9385 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9386 array of 32-bit indexes (using the byte order of the application binary),
9387 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9388 table contains a 32-bit index into the pool of section numbers. For unused
9389 hash table slots, the corresponding entry in the parallel table will be 0.
9391 The pool of section numbers begins immediately following the hash table
9392 (at offset 16 + 12 * M from the beginning of the section). The pool of
9393 section numbers consists of an array of 32-bit words (using the byte order
9394 of the application binary). Each item in the array is indexed starting
9395 from 0. The hash table entry provides the index of the first section
9396 number in the set. Additional section numbers in the set follow, and the
9397 set is terminated by a 0 entry (section number 0 is not used in ELF).
9399 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9400 section must be the first entry in the set, and the .debug_abbrev.dwo must
9401 be the second entry. Other members of the set may follow in any order.
9407 DWP Version 2 combines all the .debug_info, etc. sections into one,
9408 and the entries in the index tables are now offsets into these sections.
9409 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9412 Index Section Contents:
9414 Hash Table of Signatures dwp_hash_table.hash_table
9415 Parallel Table of Indices dwp_hash_table.unit_table
9416 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9417 Table of Section Sizes dwp_hash_table.v2.sizes
9419 The index section header consists of:
9421 V, 32 bit version number
9422 L, 32 bit number of columns in the table of section offsets
9423 N, 32 bit number of compilation units or type units in the index
9424 M, 32 bit number of slots in the hash table
9426 Numbers are recorded using the byte order of the application binary.
9428 The hash table has the same format as version 1.
9429 The parallel table of indices has the same format as version 1,
9430 except that the entries are origin-1 indices into the table of sections
9431 offsets and the table of section sizes.
9433 The table of offsets begins immediately following the parallel table
9434 (at offset 16 + 12 * M from the beginning of the section). The table is
9435 a two-dimensional array of 32-bit words (using the byte order of the
9436 application binary), with L columns and N+1 rows, in row-major order.
9437 Each row in the array is indexed starting from 0. The first row provides
9438 a key to the remaining rows: each column in this row provides an identifier
9439 for a debug section, and the offsets in the same column of subsequent rows
9440 refer to that section. The section identifiers are:
9442 DW_SECT_INFO 1 .debug_info.dwo
9443 DW_SECT_TYPES 2 .debug_types.dwo
9444 DW_SECT_ABBREV 3 .debug_abbrev.dwo
9445 DW_SECT_LINE 4 .debug_line.dwo
9446 DW_SECT_LOC 5 .debug_loc.dwo
9447 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
9448 DW_SECT_MACINFO 7 .debug_macinfo.dwo
9449 DW_SECT_MACRO 8 .debug_macro.dwo
9451 The offsets provided by the CU and TU index sections are the base offsets
9452 for the contributions made by each CU or TU to the corresponding section
9453 in the package file. Each CU and TU header contains an abbrev_offset
9454 field, used to find the abbreviations table for that CU or TU within the
9455 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
9456 be interpreted as relative to the base offset given in the index section.
9457 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
9458 should be interpreted as relative to the base offset for .debug_line.dwo,
9459 and offsets into other debug sections obtained from DWARF attributes should
9460 also be interpreted as relative to the corresponding base offset.
9462 The table of sizes begins immediately following the table of offsets.
9463 Like the table of offsets, it is a two-dimensional array of 32-bit words,
9464 with L columns and N rows, in row-major order. Each row in the array is
9465 indexed starting from 1 (row 0 is shared by the two tables).
9469 Hash table lookup is handled the same in version 1 and 2:
9471 We assume that N and M will not exceed 2^32 - 1.
9472 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
9474 Given a 64-bit compilation unit signature or a type signature S, an entry
9475 in the hash table is located as follows:
9477 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
9478 the low-order k bits all set to 1.
9480 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
9482 3) If the hash table entry at index H matches the signature, use that
9483 entry. If the hash table entry at index H is unused (all zeroes),
9484 terminate the search: the signature is not present in the table.
9486 4) Let H = (H + H') modulo M. Repeat at Step 3.
9488 Because M > N and H' and M are relatively prime, the search is guaranteed
9489 to stop at an unused slot or find the match. */
9491 /* Create a hash table to map DWO IDs to their CU/TU entry in
9492 .debug_{info,types}.dwo in DWP_FILE.
9493 Returns NULL if there isn't one.
9494 Note: This function processes DWP files only, not DWO files. */
9496 static struct dwp_hash_table *
9497 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
9499 struct objfile *objfile = dwarf2_per_objfile->objfile;
9500 bfd *dbfd = dwp_file->dbfd;
9501 const gdb_byte *index_ptr, *index_end;
9502 struct dwarf2_section_info *index;
9503 uint32_t version, nr_columns, nr_units, nr_slots;
9504 struct dwp_hash_table *htab;
9507 index = &dwp_file->sections.tu_index;
9509 index = &dwp_file->sections.cu_index;
9511 if (dwarf2_section_empty_p (index))
9513 dwarf2_read_section (objfile, index);
9515 index_ptr = index->buffer;
9516 index_end = index_ptr + index->size;
9518 version = read_4_bytes (dbfd, index_ptr);
9521 nr_columns = read_4_bytes (dbfd, index_ptr);
9525 nr_units = read_4_bytes (dbfd, index_ptr);
9527 nr_slots = read_4_bytes (dbfd, index_ptr);
9530 if (version != 1 && version != 2)
9532 error (_("Dwarf Error: unsupported DWP file version (%s)"
9534 pulongest (version), dwp_file->name);
9536 if (nr_slots != (nr_slots & -nr_slots))
9538 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9539 " is not power of 2 [in module %s]"),
9540 pulongest (nr_slots), dwp_file->name);
9543 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9544 htab->version = version;
9545 htab->nr_columns = nr_columns;
9546 htab->nr_units = nr_units;
9547 htab->nr_slots = nr_slots;
9548 htab->hash_table = index_ptr;
9549 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9551 /* Exit early if the table is empty. */
9552 if (nr_slots == 0 || nr_units == 0
9553 || (version == 2 && nr_columns == 0))
9555 /* All must be zero. */
9556 if (nr_slots != 0 || nr_units != 0
9557 || (version == 2 && nr_columns != 0))
9559 complaint (&symfile_complaints,
9560 _("Empty DWP but nr_slots,nr_units,nr_columns not"
9561 " all zero [in modules %s]"),
9569 htab->section_pool.v1.indices =
9570 htab->unit_table + sizeof (uint32_t) * nr_slots;
9571 /* It's harder to decide whether the section is too small in v1.
9572 V1 is deprecated anyway so we punt. */
9576 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
9577 int *ids = htab->section_pool.v2.section_ids;
9578 /* Reverse map for error checking. */
9579 int ids_seen[DW_SECT_MAX + 1];
9584 error (_("Dwarf Error: bad DWP hash table, too few columns"
9585 " in section table [in module %s]"),
9588 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
9590 error (_("Dwarf Error: bad DWP hash table, too many columns"
9591 " in section table [in module %s]"),
9594 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9595 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9596 for (i = 0; i < nr_columns; ++i)
9598 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
9600 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
9602 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
9603 " in section table [in module %s]"),
9604 id, dwp_file->name);
9606 if (ids_seen[id] != -1)
9608 error (_("Dwarf Error: bad DWP hash table, duplicate section"
9609 " id %d in section table [in module %s]"),
9610 id, dwp_file->name);
9615 /* Must have exactly one info or types section. */
9616 if (((ids_seen[DW_SECT_INFO] != -1)
9617 + (ids_seen[DW_SECT_TYPES] != -1))
9620 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
9621 " DWO info/types section [in module %s]"),
9624 /* Must have an abbrev section. */
9625 if (ids_seen[DW_SECT_ABBREV] == -1)
9627 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
9628 " section [in module %s]"),
9631 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
9632 htab->section_pool.v2.sizes =
9633 htab->section_pool.v2.offsets + (sizeof (uint32_t)
9634 * nr_units * nr_columns);
9635 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
9636 * nr_units * nr_columns))
9639 error (_("Dwarf Error: DWP index section is corrupt (too small)"
9648 /* Update SECTIONS with the data from SECTP.
9650 This function is like the other "locate" section routines that are
9651 passed to bfd_map_over_sections, but in this context the sections to
9652 read comes from the DWP V1 hash table, not the full ELF section table.
9654 The result is non-zero for success, or zero if an error was found. */
9657 locate_v1_virtual_dwo_sections (asection *sectp,
9658 struct virtual_v1_dwo_sections *sections)
9660 const struct dwop_section_names *names = &dwop_section_names;
9662 if (section_is_p (sectp->name, &names->abbrev_dwo))
9664 /* There can be only one. */
9665 if (sections->abbrev.s.asection != NULL)
9667 sections->abbrev.s.asection = sectp;
9668 sections->abbrev.size = bfd_get_section_size (sectp);
9670 else if (section_is_p (sectp->name, &names->info_dwo)
9671 || section_is_p (sectp->name, &names->types_dwo))
9673 /* There can be only one. */
9674 if (sections->info_or_types.s.asection != NULL)
9676 sections->info_or_types.s.asection = sectp;
9677 sections->info_or_types.size = bfd_get_section_size (sectp);
9679 else if (section_is_p (sectp->name, &names->line_dwo))
9681 /* There can be only one. */
9682 if (sections->line.s.asection != NULL)
9684 sections->line.s.asection = sectp;
9685 sections->line.size = bfd_get_section_size (sectp);
9687 else if (section_is_p (sectp->name, &names->loc_dwo))
9689 /* There can be only one. */
9690 if (sections->loc.s.asection != NULL)
9692 sections->loc.s.asection = sectp;
9693 sections->loc.size = bfd_get_section_size (sectp);
9695 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9697 /* There can be only one. */
9698 if (sections->macinfo.s.asection != NULL)
9700 sections->macinfo.s.asection = sectp;
9701 sections->macinfo.size = bfd_get_section_size (sectp);
9703 else if (section_is_p (sectp->name, &names->macro_dwo))
9705 /* There can be only one. */
9706 if (sections->macro.s.asection != NULL)
9708 sections->macro.s.asection = sectp;
9709 sections->macro.size = bfd_get_section_size (sectp);
9711 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9713 /* There can be only one. */
9714 if (sections->str_offsets.s.asection != NULL)
9716 sections->str_offsets.s.asection = sectp;
9717 sections->str_offsets.size = bfd_get_section_size (sectp);
9721 /* No other kind of section is valid. */
9728 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
9729 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
9730 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
9731 This is for DWP version 1 files. */
9733 static struct dwo_unit *
9734 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
9735 uint32_t unit_index,
9736 const char *comp_dir,
9737 ULONGEST signature, int is_debug_types)
9739 struct objfile *objfile = dwarf2_per_objfile->objfile;
9740 const struct dwp_hash_table *dwp_htab =
9741 is_debug_types ? dwp_file->tus : dwp_file->cus;
9742 bfd *dbfd = dwp_file->dbfd;
9743 const char *kind = is_debug_types ? "TU" : "CU";
9744 struct dwo_file *dwo_file;
9745 struct dwo_unit *dwo_unit;
9746 struct virtual_v1_dwo_sections sections;
9747 void **dwo_file_slot;
9748 char *virtual_dwo_name;
9749 struct dwarf2_section_info *cutu;
9750 struct cleanup *cleanups;
9753 gdb_assert (dwp_file->version == 1);
9755 if (dwarf2_read_debug)
9757 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
9759 pulongest (unit_index), hex_string (signature),
9763 /* Fetch the sections of this DWO unit.
9764 Put a limit on the number of sections we look for so that bad data
9765 doesn't cause us to loop forever. */
9767 #define MAX_NR_V1_DWO_SECTIONS \
9768 (1 /* .debug_info or .debug_types */ \
9769 + 1 /* .debug_abbrev */ \
9770 + 1 /* .debug_line */ \
9771 + 1 /* .debug_loc */ \
9772 + 1 /* .debug_str_offsets */ \
9773 + 1 /* .debug_macro or .debug_macinfo */ \
9774 + 1 /* trailing zero */)
9776 memset (§ions, 0, sizeof (sections));
9777 cleanups = make_cleanup (null_cleanup, 0);
9779 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
9782 uint32_t section_nr =
9784 dwp_htab->section_pool.v1.indices
9785 + (unit_index + i) * sizeof (uint32_t));
9787 if (section_nr == 0)
9789 if (section_nr >= dwp_file->num_sections)
9791 error (_("Dwarf Error: bad DWP hash table, section number too large"
9796 sectp = dwp_file->elf_sections[section_nr];
9797 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
9799 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9806 || dwarf2_section_empty_p (§ions.info_or_types)
9807 || dwarf2_section_empty_p (§ions.abbrev))
9809 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9813 if (i == MAX_NR_V1_DWO_SECTIONS)
9815 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9820 /* It's easier for the rest of the code if we fake a struct dwo_file and
9821 have dwo_unit "live" in that. At least for now.
9823 The DWP file can be made up of a random collection of CUs and TUs.
9824 However, for each CU + set of TUs that came from the same original DWO
9825 file, we can combine them back into a virtual DWO file to save space
9826 (fewer struct dwo_file objects to allocate). Remember that for really
9827 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9830 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9831 get_section_id (§ions.abbrev),
9832 get_section_id (§ions.line),
9833 get_section_id (§ions.loc),
9834 get_section_id (§ions.str_offsets));
9835 make_cleanup (xfree, virtual_dwo_name);
9836 /* Can we use an existing virtual DWO file? */
9837 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9838 /* Create one if necessary. */
9839 if (*dwo_file_slot == NULL)
9841 if (dwarf2_read_debug)
9843 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9846 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9847 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9849 strlen (virtual_dwo_name));
9850 dwo_file->comp_dir = comp_dir;
9851 dwo_file->sections.abbrev = sections.abbrev;
9852 dwo_file->sections.line = sections.line;
9853 dwo_file->sections.loc = sections.loc;
9854 dwo_file->sections.macinfo = sections.macinfo;
9855 dwo_file->sections.macro = sections.macro;
9856 dwo_file->sections.str_offsets = sections.str_offsets;
9857 /* The "str" section is global to the entire DWP file. */
9858 dwo_file->sections.str = dwp_file->sections.str;
9859 /* The info or types section is assigned below to dwo_unit,
9860 there's no need to record it in dwo_file.
9861 Also, we can't simply record type sections in dwo_file because
9862 we record a pointer into the vector in dwo_unit. As we collect more
9863 types we'll grow the vector and eventually have to reallocate space
9864 for it, invalidating all copies of pointers into the previous
9866 *dwo_file_slot = dwo_file;
9870 if (dwarf2_read_debug)
9872 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9875 dwo_file = *dwo_file_slot;
9877 do_cleanups (cleanups);
9879 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9880 dwo_unit->dwo_file = dwo_file;
9881 dwo_unit->signature = signature;
9882 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9883 sizeof (struct dwarf2_section_info));
9884 *dwo_unit->section = sections.info_or_types;
9885 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
9890 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
9891 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
9892 piece within that section used by a TU/CU, return a virtual section
9893 of just that piece. */
9895 static struct dwarf2_section_info
9896 create_dwp_v2_section (struct dwarf2_section_info *section,
9897 bfd_size_type offset, bfd_size_type size)
9899 struct dwarf2_section_info result;
9902 gdb_assert (section != NULL);
9903 gdb_assert (!section->is_virtual);
9905 memset (&result, 0, sizeof (result));
9906 result.s.containing_section = section;
9907 result.is_virtual = 1;
9912 sectp = get_section_bfd_section (section);
9914 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
9915 bounds of the real section. This is a pretty-rare event, so just
9916 flag an error (easier) instead of a warning and trying to cope. */
9918 || offset + size > bfd_get_section_size (sectp))
9920 bfd *abfd = sectp->owner;
9922 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
9923 " in section %s [in module %s]"),
9924 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
9925 objfile_name (dwarf2_per_objfile->objfile));
9928 result.virtual_offset = offset;
9933 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
9934 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
9935 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
9936 This is for DWP version 2 files. */
9938 static struct dwo_unit *
9939 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
9940 uint32_t unit_index,
9941 const char *comp_dir,
9942 ULONGEST signature, int is_debug_types)
9944 struct objfile *objfile = dwarf2_per_objfile->objfile;
9945 const struct dwp_hash_table *dwp_htab =
9946 is_debug_types ? dwp_file->tus : dwp_file->cus;
9947 bfd *dbfd = dwp_file->dbfd;
9948 const char *kind = is_debug_types ? "TU" : "CU";
9949 struct dwo_file *dwo_file;
9950 struct dwo_unit *dwo_unit;
9951 struct virtual_v2_dwo_sections sections;
9952 void **dwo_file_slot;
9953 char *virtual_dwo_name;
9954 struct dwarf2_section_info *cutu;
9955 struct cleanup *cleanups;
9958 gdb_assert (dwp_file->version == 2);
9960 if (dwarf2_read_debug)
9962 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
9964 pulongest (unit_index), hex_string (signature),
9968 /* Fetch the section offsets of this DWO unit. */
9970 memset (§ions, 0, sizeof (sections));
9971 cleanups = make_cleanup (null_cleanup, 0);
9973 for (i = 0; i < dwp_htab->nr_columns; ++i)
9975 uint32_t offset = read_4_bytes (dbfd,
9976 dwp_htab->section_pool.v2.offsets
9977 + (((unit_index - 1) * dwp_htab->nr_columns
9979 * sizeof (uint32_t)));
9980 uint32_t size = read_4_bytes (dbfd,
9981 dwp_htab->section_pool.v2.sizes
9982 + (((unit_index - 1) * dwp_htab->nr_columns
9984 * sizeof (uint32_t)));
9986 switch (dwp_htab->section_pool.v2.section_ids[i])
9990 sections.info_or_types_offset = offset;
9991 sections.info_or_types_size = size;
9993 case DW_SECT_ABBREV:
9994 sections.abbrev_offset = offset;
9995 sections.abbrev_size = size;
9998 sections.line_offset = offset;
9999 sections.line_size = size;
10002 sections.loc_offset = offset;
10003 sections.loc_size = size;
10005 case DW_SECT_STR_OFFSETS:
10006 sections.str_offsets_offset = offset;
10007 sections.str_offsets_size = size;
10009 case DW_SECT_MACINFO:
10010 sections.macinfo_offset = offset;
10011 sections.macinfo_size = size;
10013 case DW_SECT_MACRO:
10014 sections.macro_offset = offset;
10015 sections.macro_size = size;
10020 /* It's easier for the rest of the code if we fake a struct dwo_file and
10021 have dwo_unit "live" in that. At least for now.
10023 The DWP file can be made up of a random collection of CUs and TUs.
10024 However, for each CU + set of TUs that came from the same original DWO
10025 file, we can combine them back into a virtual DWO file to save space
10026 (fewer struct dwo_file objects to allocate). Remember that for really
10027 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10030 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10031 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10032 (long) (sections.line_size ? sections.line_offset : 0),
10033 (long) (sections.loc_size ? sections.loc_offset : 0),
10034 (long) (sections.str_offsets_size
10035 ? sections.str_offsets_offset : 0));
10036 make_cleanup (xfree, virtual_dwo_name);
10037 /* Can we use an existing virtual DWO file? */
10038 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10039 /* Create one if necessary. */
10040 if (*dwo_file_slot == NULL)
10042 if (dwarf2_read_debug)
10044 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10047 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10048 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
10050 strlen (virtual_dwo_name));
10051 dwo_file->comp_dir = comp_dir;
10052 dwo_file->sections.abbrev =
10053 create_dwp_v2_section (&dwp_file->sections.abbrev,
10054 sections.abbrev_offset, sections.abbrev_size);
10055 dwo_file->sections.line =
10056 create_dwp_v2_section (&dwp_file->sections.line,
10057 sections.line_offset, sections.line_size);
10058 dwo_file->sections.loc =
10059 create_dwp_v2_section (&dwp_file->sections.loc,
10060 sections.loc_offset, sections.loc_size);
10061 dwo_file->sections.macinfo =
10062 create_dwp_v2_section (&dwp_file->sections.macinfo,
10063 sections.macinfo_offset, sections.macinfo_size);
10064 dwo_file->sections.macro =
10065 create_dwp_v2_section (&dwp_file->sections.macro,
10066 sections.macro_offset, sections.macro_size);
10067 dwo_file->sections.str_offsets =
10068 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10069 sections.str_offsets_offset,
10070 sections.str_offsets_size);
10071 /* The "str" section is global to the entire DWP file. */
10072 dwo_file->sections.str = dwp_file->sections.str;
10073 /* The info or types section is assigned below to dwo_unit,
10074 there's no need to record it in dwo_file.
10075 Also, we can't simply record type sections in dwo_file because
10076 we record a pointer into the vector in dwo_unit. As we collect more
10077 types we'll grow the vector and eventually have to reallocate space
10078 for it, invalidating all copies of pointers into the previous
10080 *dwo_file_slot = dwo_file;
10084 if (dwarf2_read_debug)
10086 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10089 dwo_file = *dwo_file_slot;
10091 do_cleanups (cleanups);
10093 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10094 dwo_unit->dwo_file = dwo_file;
10095 dwo_unit->signature = signature;
10096 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
10097 sizeof (struct dwarf2_section_info));
10098 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10099 ? &dwp_file->sections.types
10100 : &dwp_file->sections.info,
10101 sections.info_or_types_offset,
10102 sections.info_or_types_size);
10103 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10108 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10109 Returns NULL if the signature isn't found. */
10111 static struct dwo_unit *
10112 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10113 ULONGEST signature, int is_debug_types)
10115 const struct dwp_hash_table *dwp_htab =
10116 is_debug_types ? dwp_file->tus : dwp_file->cus;
10117 bfd *dbfd = dwp_file->dbfd;
10118 uint32_t mask = dwp_htab->nr_slots - 1;
10119 uint32_t hash = signature & mask;
10120 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10123 struct dwo_unit find_dwo_cu, *dwo_cu;
10125 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10126 find_dwo_cu.signature = signature;
10127 slot = htab_find_slot (is_debug_types
10128 ? dwp_file->loaded_tus
10129 : dwp_file->loaded_cus,
10130 &find_dwo_cu, INSERT);
10135 /* Use a for loop so that we don't loop forever on bad debug info. */
10136 for (i = 0; i < dwp_htab->nr_slots; ++i)
10138 ULONGEST signature_in_table;
10140 signature_in_table =
10141 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10142 if (signature_in_table == signature)
10144 uint32_t unit_index =
10145 read_4_bytes (dbfd,
10146 dwp_htab->unit_table + hash * sizeof (uint32_t));
10148 if (dwp_file->version == 1)
10150 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10151 comp_dir, signature,
10156 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10157 comp_dir, signature,
10162 if (signature_in_table == 0)
10164 hash = (hash + hash2) & mask;
10167 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10168 " [in module %s]"),
10172 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10173 Open the file specified by FILE_NAME and hand it off to BFD for
10174 preliminary analysis. Return a newly initialized bfd *, which
10175 includes a canonicalized copy of FILE_NAME.
10176 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10177 SEARCH_CWD is true if the current directory is to be searched.
10178 It will be searched before debug-file-directory.
10179 If successful, the file is added to the bfd include table of the
10180 objfile's bfd (see gdb_bfd_record_inclusion).
10181 If unable to find/open the file, return NULL.
10182 NOTE: This function is derived from symfile_bfd_open. */
10185 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10189 char *absolute_name;
10190 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10191 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10192 to debug_file_directory. */
10194 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10198 if (*debug_file_directory != '\0')
10199 search_path = concat (".", dirname_separator_string,
10200 debug_file_directory, NULL);
10202 search_path = xstrdup (".");
10205 search_path = xstrdup (debug_file_directory);
10207 flags = OPF_RETURN_REALPATH;
10209 flags |= OPF_SEARCH_IN_PATH;
10210 desc = openp (search_path, flags, file_name,
10211 O_RDONLY | O_BINARY, &absolute_name);
10212 xfree (search_path);
10216 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
10217 xfree (absolute_name);
10218 if (sym_bfd == NULL)
10220 bfd_set_cacheable (sym_bfd, 1);
10222 if (!bfd_check_format (sym_bfd, bfd_object))
10224 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
10228 /* Success. Record the bfd as having been included by the objfile's bfd.
10229 This is important because things like demangled_names_hash lives in the
10230 objfile's per_bfd space and may have references to things like symbol
10231 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10232 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd);
10237 /* Try to open DWO file FILE_NAME.
10238 COMP_DIR is the DW_AT_comp_dir attribute.
10239 The result is the bfd handle of the file.
10240 If there is a problem finding or opening the file, return NULL.
10241 Upon success, the canonicalized path of the file is stored in the bfd,
10242 same as symfile_bfd_open. */
10245 open_dwo_file (const char *file_name, const char *comp_dir)
10249 if (IS_ABSOLUTE_PATH (file_name))
10250 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10252 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10254 if (comp_dir != NULL)
10256 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
10258 /* NOTE: If comp_dir is a relative path, this will also try the
10259 search path, which seems useful. */
10260 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
10261 xfree (path_to_try);
10266 /* That didn't work, try debug-file-directory, which, despite its name,
10267 is a list of paths. */
10269 if (*debug_file_directory == '\0')
10272 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10275 /* This function is mapped across the sections and remembers the offset and
10276 size of each of the DWO debugging sections we are interested in. */
10279 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10281 struct dwo_sections *dwo_sections = dwo_sections_ptr;
10282 const struct dwop_section_names *names = &dwop_section_names;
10284 if (section_is_p (sectp->name, &names->abbrev_dwo))
10286 dwo_sections->abbrev.s.asection = sectp;
10287 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10289 else if (section_is_p (sectp->name, &names->info_dwo))
10291 dwo_sections->info.s.asection = sectp;
10292 dwo_sections->info.size = bfd_get_section_size (sectp);
10294 else if (section_is_p (sectp->name, &names->line_dwo))
10296 dwo_sections->line.s.asection = sectp;
10297 dwo_sections->line.size = bfd_get_section_size (sectp);
10299 else if (section_is_p (sectp->name, &names->loc_dwo))
10301 dwo_sections->loc.s.asection = sectp;
10302 dwo_sections->loc.size = bfd_get_section_size (sectp);
10304 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10306 dwo_sections->macinfo.s.asection = sectp;
10307 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10309 else if (section_is_p (sectp->name, &names->macro_dwo))
10311 dwo_sections->macro.s.asection = sectp;
10312 dwo_sections->macro.size = bfd_get_section_size (sectp);
10314 else if (section_is_p (sectp->name, &names->str_dwo))
10316 dwo_sections->str.s.asection = sectp;
10317 dwo_sections->str.size = bfd_get_section_size (sectp);
10319 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10321 dwo_sections->str_offsets.s.asection = sectp;
10322 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10324 else if (section_is_p (sectp->name, &names->types_dwo))
10326 struct dwarf2_section_info type_section;
10328 memset (&type_section, 0, sizeof (type_section));
10329 type_section.s.asection = sectp;
10330 type_section.size = bfd_get_section_size (sectp);
10331 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10336 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10337 by PER_CU. This is for the non-DWP case.
10338 The result is NULL if DWO_NAME can't be found. */
10340 static struct dwo_file *
10341 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10342 const char *dwo_name, const char *comp_dir)
10344 struct objfile *objfile = dwarf2_per_objfile->objfile;
10345 struct dwo_file *dwo_file;
10347 struct cleanup *cleanups;
10349 dbfd = open_dwo_file (dwo_name, comp_dir);
10352 if (dwarf2_read_debug)
10353 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10356 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10357 dwo_file->dwo_name = dwo_name;
10358 dwo_file->comp_dir = comp_dir;
10359 dwo_file->dbfd = dbfd;
10361 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10363 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
10365 dwo_file->cu = create_dwo_cu (dwo_file);
10367 dwo_file->tus = create_debug_types_hash_table (dwo_file,
10368 dwo_file->sections.types);
10370 discard_cleanups (cleanups);
10372 if (dwarf2_read_debug)
10373 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10378 /* This function is mapped across the sections and remembers the offset and
10379 size of each of the DWP debugging sections common to version 1 and 2 that
10380 we are interested in. */
10383 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10384 void *dwp_file_ptr)
10386 struct dwp_file *dwp_file = dwp_file_ptr;
10387 const struct dwop_section_names *names = &dwop_section_names;
10388 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10390 /* Record the ELF section number for later lookup: this is what the
10391 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10392 gdb_assert (elf_section_nr < dwp_file->num_sections);
10393 dwp_file->elf_sections[elf_section_nr] = sectp;
10395 /* Look for specific sections that we need. */
10396 if (section_is_p (sectp->name, &names->str_dwo))
10398 dwp_file->sections.str.s.asection = sectp;
10399 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10401 else if (section_is_p (sectp->name, &names->cu_index))
10403 dwp_file->sections.cu_index.s.asection = sectp;
10404 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10406 else if (section_is_p (sectp->name, &names->tu_index))
10408 dwp_file->sections.tu_index.s.asection = sectp;
10409 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10413 /* This function is mapped across the sections and remembers the offset and
10414 size of each of the DWP version 2 debugging sections that we are interested
10415 in. This is split into a separate function because we don't know if we
10416 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10419 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10421 struct dwp_file *dwp_file = dwp_file_ptr;
10422 const struct dwop_section_names *names = &dwop_section_names;
10423 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10425 /* Record the ELF section number for later lookup: this is what the
10426 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10427 gdb_assert (elf_section_nr < dwp_file->num_sections);
10428 dwp_file->elf_sections[elf_section_nr] = sectp;
10430 /* Look for specific sections that we need. */
10431 if (section_is_p (sectp->name, &names->abbrev_dwo))
10433 dwp_file->sections.abbrev.s.asection = sectp;
10434 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
10436 else if (section_is_p (sectp->name, &names->info_dwo))
10438 dwp_file->sections.info.s.asection = sectp;
10439 dwp_file->sections.info.size = bfd_get_section_size (sectp);
10441 else if (section_is_p (sectp->name, &names->line_dwo))
10443 dwp_file->sections.line.s.asection = sectp;
10444 dwp_file->sections.line.size = bfd_get_section_size (sectp);
10446 else if (section_is_p (sectp->name, &names->loc_dwo))
10448 dwp_file->sections.loc.s.asection = sectp;
10449 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
10451 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10453 dwp_file->sections.macinfo.s.asection = sectp;
10454 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
10456 else if (section_is_p (sectp->name, &names->macro_dwo))
10458 dwp_file->sections.macro.s.asection = sectp;
10459 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
10461 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10463 dwp_file->sections.str_offsets.s.asection = sectp;
10464 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
10466 else if (section_is_p (sectp->name, &names->types_dwo))
10468 dwp_file->sections.types.s.asection = sectp;
10469 dwp_file->sections.types.size = bfd_get_section_size (sectp);
10473 /* Hash function for dwp_file loaded CUs/TUs. */
10476 hash_dwp_loaded_cutus (const void *item)
10478 const struct dwo_unit *dwo_unit = item;
10480 /* This drops the top 32 bits of the signature, but is ok for a hash. */
10481 return dwo_unit->signature;
10484 /* Equality function for dwp_file loaded CUs/TUs. */
10487 eq_dwp_loaded_cutus (const void *a, const void *b)
10489 const struct dwo_unit *dua = a;
10490 const struct dwo_unit *dub = b;
10492 return dua->signature == dub->signature;
10495 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
10498 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
10500 return htab_create_alloc_ex (3,
10501 hash_dwp_loaded_cutus,
10502 eq_dwp_loaded_cutus,
10504 &objfile->objfile_obstack,
10505 hashtab_obstack_allocate,
10506 dummy_obstack_deallocate);
10509 /* Try to open DWP file FILE_NAME.
10510 The result is the bfd handle of the file.
10511 If there is a problem finding or opening the file, return NULL.
10512 Upon success, the canonicalized path of the file is stored in the bfd,
10513 same as symfile_bfd_open. */
10516 open_dwp_file (const char *file_name)
10520 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
10524 /* Work around upstream bug 15652.
10525 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
10526 [Whether that's a "bug" is debatable, but it is getting in our way.]
10527 We have no real idea where the dwp file is, because gdb's realpath-ing
10528 of the executable's path may have discarded the needed info.
10529 [IWBN if the dwp file name was recorded in the executable, akin to
10530 .gnu_debuglink, but that doesn't exist yet.]
10531 Strip the directory from FILE_NAME and search again. */
10532 if (*debug_file_directory != '\0')
10534 /* Don't implicitly search the current directory here.
10535 If the user wants to search "." to handle this case,
10536 it must be added to debug-file-directory. */
10537 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
10544 /* Initialize the use of the DWP file for the current objfile.
10545 By convention the name of the DWP file is ${objfile}.dwp.
10546 The result is NULL if it can't be found. */
10548 static struct dwp_file *
10549 open_and_init_dwp_file (void)
10551 struct objfile *objfile = dwarf2_per_objfile->objfile;
10552 struct dwp_file *dwp_file;
10555 struct cleanup *cleanups;
10557 /* Try to find first .dwp for the binary file before any symbolic links
10559 dwp_name = xstrprintf ("%s.dwp", objfile->original_name);
10560 cleanups = make_cleanup (xfree, dwp_name);
10562 dbfd = open_dwp_file (dwp_name);
10564 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
10566 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
10567 dwp_name = xstrprintf ("%s.dwp", objfile_name (objfile));
10568 make_cleanup (xfree, dwp_name);
10569 dbfd = open_dwp_file (dwp_name);
10574 if (dwarf2_read_debug)
10575 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
10576 do_cleanups (cleanups);
10579 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
10580 dwp_file->name = bfd_get_filename (dbfd);
10581 dwp_file->dbfd = dbfd;
10582 do_cleanups (cleanups);
10584 /* +1: section 0 is unused */
10585 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
10586 dwp_file->elf_sections =
10587 OBSTACK_CALLOC (&objfile->objfile_obstack,
10588 dwp_file->num_sections, asection *);
10590 bfd_map_over_sections (dbfd, dwarf2_locate_common_dwp_sections, dwp_file);
10592 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
10594 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
10596 /* The DWP file version is stored in the hash table. Oh well. */
10597 if (dwp_file->cus->version != dwp_file->tus->version)
10599 /* Technically speaking, we should try to limp along, but this is
10600 pretty bizarre. We use pulongest here because that's the established
10601 portability solution (e.g, we cannot use %u for uint32_t). */
10602 error (_("Dwarf Error: DWP file CU version %s doesn't match"
10603 " TU version %s [in DWP file %s]"),
10604 pulongest (dwp_file->cus->version),
10605 pulongest (dwp_file->tus->version), dwp_name);
10607 dwp_file->version = dwp_file->cus->version;
10609 if (dwp_file->version == 2)
10610 bfd_map_over_sections (dbfd, dwarf2_locate_v2_dwp_sections, dwp_file);
10612 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
10613 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
10615 if (dwarf2_read_debug)
10617 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
10618 fprintf_unfiltered (gdb_stdlog,
10619 " %s CUs, %s TUs\n",
10620 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
10621 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
10627 /* Wrapper around open_and_init_dwp_file, only open it once. */
10629 static struct dwp_file *
10630 get_dwp_file (void)
10632 if (! dwarf2_per_objfile->dwp_checked)
10634 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
10635 dwarf2_per_objfile->dwp_checked = 1;
10637 return dwarf2_per_objfile->dwp_file;
10640 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
10641 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
10642 or in the DWP file for the objfile, referenced by THIS_UNIT.
10643 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
10644 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
10646 This is called, for example, when wanting to read a variable with a
10647 complex location. Therefore we don't want to do file i/o for every call.
10648 Therefore we don't want to look for a DWO file on every call.
10649 Therefore we first see if we've already seen SIGNATURE in a DWP file,
10650 then we check if we've already seen DWO_NAME, and only THEN do we check
10653 The result is a pointer to the dwo_unit object or NULL if we didn't find it
10654 (dwo_id mismatch or couldn't find the DWO/DWP file). */
10656 static struct dwo_unit *
10657 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
10658 const char *dwo_name, const char *comp_dir,
10659 ULONGEST signature, int is_debug_types)
10661 struct objfile *objfile = dwarf2_per_objfile->objfile;
10662 const char *kind = is_debug_types ? "TU" : "CU";
10663 void **dwo_file_slot;
10664 struct dwo_file *dwo_file;
10665 struct dwp_file *dwp_file;
10667 /* First see if there's a DWP file.
10668 If we have a DWP file but didn't find the DWO inside it, don't
10669 look for the original DWO file. It makes gdb behave differently
10670 depending on whether one is debugging in the build tree. */
10672 dwp_file = get_dwp_file ();
10673 if (dwp_file != NULL)
10675 const struct dwp_hash_table *dwp_htab =
10676 is_debug_types ? dwp_file->tus : dwp_file->cus;
10678 if (dwp_htab != NULL)
10680 struct dwo_unit *dwo_cutu =
10681 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
10682 signature, is_debug_types);
10684 if (dwo_cutu != NULL)
10686 if (dwarf2_read_debug)
10688 fprintf_unfiltered (gdb_stdlog,
10689 "Virtual DWO %s %s found: @%s\n",
10690 kind, hex_string (signature),
10691 host_address_to_string (dwo_cutu));
10699 /* No DWP file, look for the DWO file. */
10701 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
10702 if (*dwo_file_slot == NULL)
10704 /* Read in the file and build a table of the CUs/TUs it contains. */
10705 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
10707 /* NOTE: This will be NULL if unable to open the file. */
10708 dwo_file = *dwo_file_slot;
10710 if (dwo_file != NULL)
10712 struct dwo_unit *dwo_cutu = NULL;
10714 if (is_debug_types && dwo_file->tus)
10716 struct dwo_unit find_dwo_cutu;
10718 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
10719 find_dwo_cutu.signature = signature;
10720 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
10722 else if (!is_debug_types && dwo_file->cu)
10724 if (signature == dwo_file->cu->signature)
10725 dwo_cutu = dwo_file->cu;
10728 if (dwo_cutu != NULL)
10730 if (dwarf2_read_debug)
10732 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
10733 kind, dwo_name, hex_string (signature),
10734 host_address_to_string (dwo_cutu));
10741 /* We didn't find it. This could mean a dwo_id mismatch, or
10742 someone deleted the DWO/DWP file, or the search path isn't set up
10743 correctly to find the file. */
10745 if (dwarf2_read_debug)
10747 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
10748 kind, dwo_name, hex_string (signature));
10751 /* This is a warning and not a complaint because it can be caused by
10752 pilot error (e.g., user accidentally deleting the DWO). */
10754 /* Print the name of the DWP file if we looked there, helps the user
10755 better diagnose the problem. */
10756 char *dwp_text = NULL;
10757 struct cleanup *cleanups;
10759 if (dwp_file != NULL)
10760 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
10761 cleanups = make_cleanup (xfree, dwp_text);
10763 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
10764 " [in module %s]"),
10765 kind, dwo_name, hex_string (signature),
10766 dwp_text != NULL ? dwp_text : "",
10767 this_unit->is_debug_types ? "TU" : "CU",
10768 this_unit->offset.sect_off, objfile_name (objfile));
10770 do_cleanups (cleanups);
10775 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
10776 See lookup_dwo_cutu_unit for details. */
10778 static struct dwo_unit *
10779 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
10780 const char *dwo_name, const char *comp_dir,
10781 ULONGEST signature)
10783 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
10786 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
10787 See lookup_dwo_cutu_unit for details. */
10789 static struct dwo_unit *
10790 lookup_dwo_type_unit (struct signatured_type *this_tu,
10791 const char *dwo_name, const char *comp_dir)
10793 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
10796 /* Traversal function for queue_and_load_all_dwo_tus. */
10799 queue_and_load_dwo_tu (void **slot, void *info)
10801 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
10802 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
10803 ULONGEST signature = dwo_unit->signature;
10804 struct signatured_type *sig_type =
10805 lookup_dwo_signatured_type (per_cu->cu, signature);
10807 if (sig_type != NULL)
10809 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
10811 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
10812 a real dependency of PER_CU on SIG_TYPE. That is detected later
10813 while processing PER_CU. */
10814 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
10815 load_full_type_unit (sig_cu);
10816 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
10822 /* Queue all TUs contained in the DWO of PER_CU to be read in.
10823 The DWO may have the only definition of the type, though it may not be
10824 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
10825 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
10828 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
10830 struct dwo_unit *dwo_unit;
10831 struct dwo_file *dwo_file;
10833 gdb_assert (!per_cu->is_debug_types);
10834 gdb_assert (get_dwp_file () == NULL);
10835 gdb_assert (per_cu->cu != NULL);
10837 dwo_unit = per_cu->cu->dwo_unit;
10838 gdb_assert (dwo_unit != NULL);
10840 dwo_file = dwo_unit->dwo_file;
10841 if (dwo_file->tus != NULL)
10842 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
10845 /* Free all resources associated with DWO_FILE.
10846 Close the DWO file and munmap the sections.
10847 All memory should be on the objfile obstack. */
10850 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
10853 struct dwarf2_section_info *section;
10855 /* Note: dbfd is NULL for virtual DWO files. */
10856 gdb_bfd_unref (dwo_file->dbfd);
10858 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
10861 /* Wrapper for free_dwo_file for use in cleanups. */
10864 free_dwo_file_cleanup (void *arg)
10866 struct dwo_file *dwo_file = (struct dwo_file *) arg;
10867 struct objfile *objfile = dwarf2_per_objfile->objfile;
10869 free_dwo_file (dwo_file, objfile);
10872 /* Traversal function for free_dwo_files. */
10875 free_dwo_file_from_slot (void **slot, void *info)
10877 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
10878 struct objfile *objfile = (struct objfile *) info;
10880 free_dwo_file (dwo_file, objfile);
10885 /* Free all resources associated with DWO_FILES. */
10888 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
10890 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
10893 /* Read in various DIEs. */
10895 /* qsort helper for inherit_abstract_dies. */
10898 unsigned_int_compar (const void *ap, const void *bp)
10900 unsigned int a = *(unsigned int *) ap;
10901 unsigned int b = *(unsigned int *) bp;
10903 return (a > b) - (b > a);
10906 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
10907 Inherit only the children of the DW_AT_abstract_origin DIE not being
10908 already referenced by DW_AT_abstract_origin from the children of the
10912 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
10914 struct die_info *child_die;
10915 unsigned die_children_count;
10916 /* CU offsets which were referenced by children of the current DIE. */
10917 sect_offset *offsets;
10918 sect_offset *offsets_end, *offsetp;
10919 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
10920 struct die_info *origin_die;
10921 /* Iterator of the ORIGIN_DIE children. */
10922 struct die_info *origin_child_die;
10923 struct cleanup *cleanups;
10924 struct attribute *attr;
10925 struct dwarf2_cu *origin_cu;
10926 struct pending **origin_previous_list_in_scope;
10928 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10932 /* Note that following die references may follow to a die in a
10936 origin_die = follow_die_ref (die, attr, &origin_cu);
10938 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
10940 origin_previous_list_in_scope = origin_cu->list_in_scope;
10941 origin_cu->list_in_scope = cu->list_in_scope;
10943 if (die->tag != origin_die->tag
10944 && !(die->tag == DW_TAG_inlined_subroutine
10945 && origin_die->tag == DW_TAG_subprogram))
10946 complaint (&symfile_complaints,
10947 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
10948 die->offset.sect_off, origin_die->offset.sect_off);
10950 child_die = die->child;
10951 die_children_count = 0;
10952 while (child_die && child_die->tag)
10954 child_die = sibling_die (child_die);
10955 die_children_count++;
10957 offsets = xmalloc (sizeof (*offsets) * die_children_count);
10958 cleanups = make_cleanup (xfree, offsets);
10960 offsets_end = offsets;
10961 child_die = die->child;
10962 while (child_die && child_die->tag)
10964 /* For each CHILD_DIE, find the corresponding child of
10965 ORIGIN_DIE. If there is more than one layer of
10966 DW_AT_abstract_origin, follow them all; there shouldn't be,
10967 but GCC versions at least through 4.4 generate this (GCC PR
10969 struct die_info *child_origin_die = child_die;
10970 struct dwarf2_cu *child_origin_cu = cu;
10974 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
10978 child_origin_die = follow_die_ref (child_origin_die, attr,
10982 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
10983 counterpart may exist. */
10984 if (child_origin_die != child_die)
10986 if (child_die->tag != child_origin_die->tag
10987 && !(child_die->tag == DW_TAG_inlined_subroutine
10988 && child_origin_die->tag == DW_TAG_subprogram))
10989 complaint (&symfile_complaints,
10990 _("Child DIE 0x%x and its abstract origin 0x%x have "
10991 "different tags"), child_die->offset.sect_off,
10992 child_origin_die->offset.sect_off);
10993 if (child_origin_die->parent != origin_die)
10994 complaint (&symfile_complaints,
10995 _("Child DIE 0x%x and its abstract origin 0x%x have "
10996 "different parents"), child_die->offset.sect_off,
10997 child_origin_die->offset.sect_off);
10999 *offsets_end++ = child_origin_die->offset;
11001 child_die = sibling_die (child_die);
11003 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11004 unsigned_int_compar);
11005 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11006 if (offsetp[-1].sect_off == offsetp->sect_off)
11007 complaint (&symfile_complaints,
11008 _("Multiple children of DIE 0x%x refer "
11009 "to DIE 0x%x as their abstract origin"),
11010 die->offset.sect_off, offsetp->sect_off);
11013 origin_child_die = origin_die->child;
11014 while (origin_child_die && origin_child_die->tag)
11016 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11017 while (offsetp < offsets_end
11018 && offsetp->sect_off < origin_child_die->offset.sect_off)
11020 if (offsetp >= offsets_end
11021 || offsetp->sect_off > origin_child_die->offset.sect_off)
11023 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11024 Check whether we're already processing ORIGIN_CHILD_DIE.
11025 This can happen with mutually referenced abstract_origins.
11027 if (!origin_child_die->in_process)
11028 process_die (origin_child_die, origin_cu);
11030 origin_child_die = sibling_die (origin_child_die);
11032 origin_cu->list_in_scope = origin_previous_list_in_scope;
11034 do_cleanups (cleanups);
11038 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11040 struct objfile *objfile = cu->objfile;
11041 struct context_stack *new;
11044 struct die_info *child_die;
11045 struct attribute *attr, *call_line, *call_file;
11047 CORE_ADDR baseaddr;
11048 struct block *block;
11049 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11050 VEC (symbolp) *template_args = NULL;
11051 struct template_symbol *templ_func = NULL;
11055 /* If we do not have call site information, we can't show the
11056 caller of this inlined function. That's too confusing, so
11057 only use the scope for local variables. */
11058 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11059 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11060 if (call_line == NULL || call_file == NULL)
11062 read_lexical_block_scope (die, cu);
11067 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11069 name = dwarf2_name (die, cu);
11071 /* Ignore functions with missing or empty names. These are actually
11072 illegal according to the DWARF standard. */
11075 complaint (&symfile_complaints,
11076 _("missing name for subprogram DIE at %d"),
11077 die->offset.sect_off);
11081 /* Ignore functions with missing or invalid low and high pc attributes. */
11082 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11084 attr = dwarf2_attr (die, DW_AT_external, cu);
11085 if (!attr || !DW_UNSND (attr))
11086 complaint (&symfile_complaints,
11087 _("cannot get low and high bounds "
11088 "for subprogram DIE at %d"),
11089 die->offset.sect_off);
11094 highpc += baseaddr;
11096 /* If we have any template arguments, then we must allocate a
11097 different sort of symbol. */
11098 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11100 if (child_die->tag == DW_TAG_template_type_param
11101 || child_die->tag == DW_TAG_template_value_param)
11103 templ_func = allocate_template_symbol (objfile);
11104 templ_func->base.is_cplus_template_function = 1;
11109 new = push_context (0, lowpc);
11110 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
11111 (struct symbol *) templ_func);
11113 /* If there is a location expression for DW_AT_frame_base, record
11115 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11117 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
11119 cu->list_in_scope = &local_symbols;
11121 if (die->child != NULL)
11123 child_die = die->child;
11124 while (child_die && child_die->tag)
11126 if (child_die->tag == DW_TAG_template_type_param
11127 || child_die->tag == DW_TAG_template_value_param)
11129 struct symbol *arg = new_symbol (child_die, NULL, cu);
11132 VEC_safe_push (symbolp, template_args, arg);
11135 process_die (child_die, cu);
11136 child_die = sibling_die (child_die);
11140 inherit_abstract_dies (die, cu);
11142 /* If we have a DW_AT_specification, we might need to import using
11143 directives from the context of the specification DIE. See the
11144 comment in determine_prefix. */
11145 if (cu->language == language_cplus
11146 && dwarf2_attr (die, DW_AT_specification, cu))
11148 struct dwarf2_cu *spec_cu = cu;
11149 struct die_info *spec_die = die_specification (die, &spec_cu);
11153 child_die = spec_die->child;
11154 while (child_die && child_die->tag)
11156 if (child_die->tag == DW_TAG_imported_module)
11157 process_die (child_die, spec_cu);
11158 child_die = sibling_die (child_die);
11161 /* In some cases, GCC generates specification DIEs that
11162 themselves contain DW_AT_specification attributes. */
11163 spec_die = die_specification (spec_die, &spec_cu);
11167 new = pop_context ();
11168 /* Make a block for the local symbols within. */
11169 block = finish_block (new->name, &local_symbols, new->old_blocks,
11170 lowpc, highpc, objfile);
11172 /* For C++, set the block's scope. */
11173 if ((cu->language == language_cplus || cu->language == language_fortran)
11174 && cu->processing_has_namespace_info)
11175 block_set_scope (block, determine_prefix (die, cu),
11176 &objfile->objfile_obstack);
11178 /* If we have address ranges, record them. */
11179 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11181 /* Attach template arguments to function. */
11182 if (! VEC_empty (symbolp, template_args))
11184 gdb_assert (templ_func != NULL);
11186 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11187 templ_func->template_arguments
11188 = obstack_alloc (&objfile->objfile_obstack,
11189 (templ_func->n_template_arguments
11190 * sizeof (struct symbol *)));
11191 memcpy (templ_func->template_arguments,
11192 VEC_address (symbolp, template_args),
11193 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11194 VEC_free (symbolp, template_args);
11197 /* In C++, we can have functions nested inside functions (e.g., when
11198 a function declares a class that has methods). This means that
11199 when we finish processing a function scope, we may need to go
11200 back to building a containing block's symbol lists. */
11201 local_symbols = new->locals;
11202 using_directives = new->using_directives;
11204 /* If we've finished processing a top-level function, subsequent
11205 symbols go in the file symbol list. */
11206 if (outermost_context_p ())
11207 cu->list_in_scope = &file_symbols;
11210 /* Process all the DIES contained within a lexical block scope. Start
11211 a new scope, process the dies, and then close the scope. */
11214 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11216 struct objfile *objfile = cu->objfile;
11217 struct context_stack *new;
11218 CORE_ADDR lowpc, highpc;
11219 struct die_info *child_die;
11220 CORE_ADDR baseaddr;
11222 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11224 /* Ignore blocks with missing or invalid low and high pc attributes. */
11225 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11226 as multiple lexical blocks? Handling children in a sane way would
11227 be nasty. Might be easier to properly extend generic blocks to
11228 describe ranges. */
11229 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11232 highpc += baseaddr;
11234 push_context (0, lowpc);
11235 if (die->child != NULL)
11237 child_die = die->child;
11238 while (child_die && child_die->tag)
11240 process_die (child_die, cu);
11241 child_die = sibling_die (child_die);
11244 new = pop_context ();
11246 if (local_symbols != NULL || using_directives != NULL)
11248 struct block *block
11249 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
11252 /* Note that recording ranges after traversing children, as we
11253 do here, means that recording a parent's ranges entails
11254 walking across all its children's ranges as they appear in
11255 the address map, which is quadratic behavior.
11257 It would be nicer to record the parent's ranges before
11258 traversing its children, simply overriding whatever you find
11259 there. But since we don't even decide whether to create a
11260 block until after we've traversed its children, that's hard
11262 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11264 local_symbols = new->locals;
11265 using_directives = new->using_directives;
11268 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
11271 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11273 struct objfile *objfile = cu->objfile;
11274 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11275 CORE_ADDR pc, baseaddr;
11276 struct attribute *attr;
11277 struct call_site *call_site, call_site_local;
11280 struct die_info *child_die;
11282 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11284 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11287 complaint (&symfile_complaints,
11288 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
11289 "DIE 0x%x [in module %s]"),
11290 die->offset.sect_off, objfile_name (objfile));
11293 pc = attr_value_as_address (attr) + baseaddr;
11295 if (cu->call_site_htab == NULL)
11296 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11297 NULL, &objfile->objfile_obstack,
11298 hashtab_obstack_allocate, NULL);
11299 call_site_local.pc = pc;
11300 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11303 complaint (&symfile_complaints,
11304 _("Duplicate PC %s for DW_TAG_GNU_call_site "
11305 "DIE 0x%x [in module %s]"),
11306 paddress (gdbarch, pc), die->offset.sect_off,
11307 objfile_name (objfile));
11311 /* Count parameters at the caller. */
11314 for (child_die = die->child; child_die && child_die->tag;
11315 child_die = sibling_die (child_die))
11317 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11319 complaint (&symfile_complaints,
11320 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
11321 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11322 child_die->tag, child_die->offset.sect_off,
11323 objfile_name (objfile));
11330 call_site = obstack_alloc (&objfile->objfile_obstack,
11331 (sizeof (*call_site)
11332 + (sizeof (*call_site->parameter)
11333 * (nparams - 1))));
11335 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11336 call_site->pc = pc;
11338 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11340 struct die_info *func_die;
11342 /* Skip also over DW_TAG_inlined_subroutine. */
11343 for (func_die = die->parent;
11344 func_die && func_die->tag != DW_TAG_subprogram
11345 && func_die->tag != DW_TAG_subroutine_type;
11346 func_die = func_die->parent);
11348 /* DW_AT_GNU_all_call_sites is a superset
11349 of DW_AT_GNU_all_tail_call_sites. */
11351 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11352 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11354 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11355 not complete. But keep CALL_SITE for look ups via call_site_htab,
11356 both the initial caller containing the real return address PC and
11357 the final callee containing the current PC of a chain of tail
11358 calls do not need to have the tail call list complete. But any
11359 function candidate for a virtual tail call frame searched via
11360 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11361 determined unambiguously. */
11365 struct type *func_type = NULL;
11368 func_type = get_die_type (func_die, cu);
11369 if (func_type != NULL)
11371 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
11373 /* Enlist this call site to the function. */
11374 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
11375 TYPE_TAIL_CALL_LIST (func_type) = call_site;
11378 complaint (&symfile_complaints,
11379 _("Cannot find function owning DW_TAG_GNU_call_site "
11380 "DIE 0x%x [in module %s]"),
11381 die->offset.sect_off, objfile_name (objfile));
11385 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
11387 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11388 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
11389 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
11390 /* Keep NULL DWARF_BLOCK. */;
11391 else if (attr_form_is_block (attr))
11393 struct dwarf2_locexpr_baton *dlbaton;
11395 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
11396 dlbaton->data = DW_BLOCK (attr)->data;
11397 dlbaton->size = DW_BLOCK (attr)->size;
11398 dlbaton->per_cu = cu->per_cu;
11400 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
11402 else if (attr_form_is_ref (attr))
11404 struct dwarf2_cu *target_cu = cu;
11405 struct die_info *target_die;
11407 target_die = follow_die_ref (die, attr, &target_cu);
11408 gdb_assert (target_cu->objfile == objfile);
11409 if (die_is_declaration (target_die, target_cu))
11411 const char *target_physname = NULL;
11412 struct attribute *target_attr;
11414 /* Prefer the mangled name; otherwise compute the demangled one. */
11415 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
11416 if (target_attr == NULL)
11417 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
11419 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
11420 target_physname = DW_STRING (target_attr);
11422 target_physname = dwarf2_physname (NULL, target_die, target_cu);
11423 if (target_physname == NULL)
11424 complaint (&symfile_complaints,
11425 _("DW_AT_GNU_call_site_target target DIE has invalid "
11426 "physname, for referencing DIE 0x%x [in module %s]"),
11427 die->offset.sect_off, objfile_name (objfile));
11429 SET_FIELD_PHYSNAME (call_site->target, target_physname);
11435 /* DW_AT_entry_pc should be preferred. */
11436 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
11437 complaint (&symfile_complaints,
11438 _("DW_AT_GNU_call_site_target target DIE has invalid "
11439 "low pc, for referencing DIE 0x%x [in module %s]"),
11440 die->offset.sect_off, objfile_name (objfile));
11442 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
11446 complaint (&symfile_complaints,
11447 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
11448 "block nor reference, for DIE 0x%x [in module %s]"),
11449 die->offset.sect_off, objfile_name (objfile));
11451 call_site->per_cu = cu->per_cu;
11453 for (child_die = die->child;
11454 child_die && child_die->tag;
11455 child_die = sibling_die (child_die))
11457 struct call_site_parameter *parameter;
11458 struct attribute *loc, *origin;
11460 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11462 /* Already printed the complaint above. */
11466 gdb_assert (call_site->parameter_count < nparams);
11467 parameter = &call_site->parameter[call_site->parameter_count];
11469 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
11470 specifies DW_TAG_formal_parameter. Value of the data assumed for the
11471 register is contained in DW_AT_GNU_call_site_value. */
11473 loc = dwarf2_attr (child_die, DW_AT_location, cu);
11474 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
11475 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
11477 sect_offset offset;
11479 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
11480 offset = dwarf2_get_ref_die_offset (origin);
11481 if (!offset_in_cu_p (&cu->header, offset))
11483 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
11484 binding can be done only inside one CU. Such referenced DIE
11485 therefore cannot be even moved to DW_TAG_partial_unit. */
11486 complaint (&symfile_complaints,
11487 _("DW_AT_abstract_origin offset is not in CU for "
11488 "DW_TAG_GNU_call_site child DIE 0x%x "
11490 child_die->offset.sect_off, objfile_name (objfile));
11493 parameter->u.param_offset.cu_off = (offset.sect_off
11494 - cu->header.offset.sect_off);
11496 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
11498 complaint (&symfile_complaints,
11499 _("No DW_FORM_block* DW_AT_location for "
11500 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11501 child_die->offset.sect_off, objfile_name (objfile));
11506 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
11507 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
11508 if (parameter->u.dwarf_reg != -1)
11509 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
11510 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
11511 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
11512 ¶meter->u.fb_offset))
11513 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
11516 complaint (&symfile_complaints,
11517 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
11518 "for DW_FORM_block* DW_AT_location is supported for "
11519 "DW_TAG_GNU_call_site child DIE 0x%x "
11521 child_die->offset.sect_off, objfile_name (objfile));
11526 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
11527 if (!attr_form_is_block (attr))
11529 complaint (&symfile_complaints,
11530 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
11531 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11532 child_die->offset.sect_off, objfile_name (objfile));
11535 parameter->value = DW_BLOCK (attr)->data;
11536 parameter->value_size = DW_BLOCK (attr)->size;
11538 /* Parameters are not pre-cleared by memset above. */
11539 parameter->data_value = NULL;
11540 parameter->data_value_size = 0;
11541 call_site->parameter_count++;
11543 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
11546 if (!attr_form_is_block (attr))
11547 complaint (&symfile_complaints,
11548 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
11549 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11550 child_die->offset.sect_off, objfile_name (objfile));
11553 parameter->data_value = DW_BLOCK (attr)->data;
11554 parameter->data_value_size = DW_BLOCK (attr)->size;
11560 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
11561 Return 1 if the attributes are present and valid, otherwise, return 0.
11562 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
11565 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
11566 CORE_ADDR *high_return, struct dwarf2_cu *cu,
11567 struct partial_symtab *ranges_pst)
11569 struct objfile *objfile = cu->objfile;
11570 struct comp_unit_head *cu_header = &cu->header;
11571 bfd *obfd = objfile->obfd;
11572 unsigned int addr_size = cu_header->addr_size;
11573 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
11574 /* Base address selection entry. */
11577 unsigned int dummy;
11578 const gdb_byte *buffer;
11582 CORE_ADDR high = 0;
11583 CORE_ADDR baseaddr;
11585 found_base = cu->base_known;
11586 base = cu->base_address;
11588 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
11589 if (offset >= dwarf2_per_objfile->ranges.size)
11591 complaint (&symfile_complaints,
11592 _("Offset %d out of bounds for DW_AT_ranges attribute"),
11596 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11598 /* Read in the largest possible address. */
11599 marker = read_address (obfd, buffer, cu, &dummy);
11600 if ((marker & mask) == mask)
11602 /* If we found the largest possible address, then
11603 read the base address. */
11604 base = read_address (obfd, buffer + addr_size, cu, &dummy);
11605 buffer += 2 * addr_size;
11606 offset += 2 * addr_size;
11612 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11616 CORE_ADDR range_beginning, range_end;
11618 range_beginning = read_address (obfd, buffer, cu, &dummy);
11619 buffer += addr_size;
11620 range_end = read_address (obfd, buffer, cu, &dummy);
11621 buffer += addr_size;
11622 offset += 2 * addr_size;
11624 /* An end of list marker is a pair of zero addresses. */
11625 if (range_beginning == 0 && range_end == 0)
11626 /* Found the end of list entry. */
11629 /* Each base address selection entry is a pair of 2 values.
11630 The first is the largest possible address, the second is
11631 the base address. Check for a base address here. */
11632 if ((range_beginning & mask) == mask)
11634 /* If we found the largest possible address, then
11635 read the base address. */
11636 base = read_address (obfd, buffer + addr_size, cu, &dummy);
11643 /* We have no valid base address for the ranges
11645 complaint (&symfile_complaints,
11646 _("Invalid .debug_ranges data (no base address)"));
11650 if (range_beginning > range_end)
11652 /* Inverted range entries are invalid. */
11653 complaint (&symfile_complaints,
11654 _("Invalid .debug_ranges data (inverted range)"));
11658 /* Empty range entries have no effect. */
11659 if (range_beginning == range_end)
11662 range_beginning += base;
11665 /* A not-uncommon case of bad debug info.
11666 Don't pollute the addrmap with bad data. */
11667 if (range_beginning + baseaddr == 0
11668 && !dwarf2_per_objfile->has_section_at_zero)
11670 complaint (&symfile_complaints,
11671 _(".debug_ranges entry has start address of zero"
11672 " [in module %s]"), objfile_name (objfile));
11676 if (ranges_pst != NULL)
11677 addrmap_set_empty (objfile->psymtabs_addrmap,
11678 range_beginning + baseaddr,
11679 range_end - 1 + baseaddr,
11682 /* FIXME: This is recording everything as a low-high
11683 segment of consecutive addresses. We should have a
11684 data structure for discontiguous block ranges
11688 low = range_beginning;
11694 if (range_beginning < low)
11695 low = range_beginning;
11696 if (range_end > high)
11702 /* If the first entry is an end-of-list marker, the range
11703 describes an empty scope, i.e. no instructions. */
11709 *high_return = high;
11713 /* Get low and high pc attributes from a die. Return 1 if the attributes
11714 are present and valid, otherwise, return 0. Return -1 if the range is
11715 discontinuous, i.e. derived from DW_AT_ranges information. */
11718 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
11719 CORE_ADDR *highpc, struct dwarf2_cu *cu,
11720 struct partial_symtab *pst)
11722 struct attribute *attr;
11723 struct attribute *attr_high;
11725 CORE_ADDR high = 0;
11728 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
11731 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11734 low = attr_value_as_address (attr);
11735 high = attr_value_as_address (attr_high);
11736 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
11740 /* Found high w/o low attribute. */
11743 /* Found consecutive range of addresses. */
11748 attr = dwarf2_attr (die, DW_AT_ranges, cu);
11751 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
11752 We take advantage of the fact that DW_AT_ranges does not appear
11753 in DW_TAG_compile_unit of DWO files. */
11754 int need_ranges_base = die->tag != DW_TAG_compile_unit;
11755 unsigned int ranges_offset = (DW_UNSND (attr)
11756 + (need_ranges_base
11760 /* Value of the DW_AT_ranges attribute is the offset in the
11761 .debug_ranges section. */
11762 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
11764 /* Found discontinuous range of addresses. */
11769 /* read_partial_die has also the strict LOW < HIGH requirement. */
11773 /* When using the GNU linker, .gnu.linkonce. sections are used to
11774 eliminate duplicate copies of functions and vtables and such.
11775 The linker will arbitrarily choose one and discard the others.
11776 The AT_*_pc values for such functions refer to local labels in
11777 these sections. If the section from that file was discarded, the
11778 labels are not in the output, so the relocs get a value of 0.
11779 If this is a discarded function, mark the pc bounds as invalid,
11780 so that GDB will ignore it. */
11781 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
11790 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
11791 its low and high PC addresses. Do nothing if these addresses could not
11792 be determined. Otherwise, set LOWPC to the low address if it is smaller,
11793 and HIGHPC to the high address if greater than HIGHPC. */
11796 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
11797 CORE_ADDR *lowpc, CORE_ADDR *highpc,
11798 struct dwarf2_cu *cu)
11800 CORE_ADDR low, high;
11801 struct die_info *child = die->child;
11803 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
11805 *lowpc = min (*lowpc, low);
11806 *highpc = max (*highpc, high);
11809 /* If the language does not allow nested subprograms (either inside
11810 subprograms or lexical blocks), we're done. */
11811 if (cu->language != language_ada)
11814 /* Check all the children of the given DIE. If it contains nested
11815 subprograms, then check their pc bounds. Likewise, we need to
11816 check lexical blocks as well, as they may also contain subprogram
11818 while (child && child->tag)
11820 if (child->tag == DW_TAG_subprogram
11821 || child->tag == DW_TAG_lexical_block)
11822 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
11823 child = sibling_die (child);
11827 /* Get the low and high pc's represented by the scope DIE, and store
11828 them in *LOWPC and *HIGHPC. If the correct values can't be
11829 determined, set *LOWPC to -1 and *HIGHPC to 0. */
11832 get_scope_pc_bounds (struct die_info *die,
11833 CORE_ADDR *lowpc, CORE_ADDR *highpc,
11834 struct dwarf2_cu *cu)
11836 CORE_ADDR best_low = (CORE_ADDR) -1;
11837 CORE_ADDR best_high = (CORE_ADDR) 0;
11838 CORE_ADDR current_low, current_high;
11840 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
11842 best_low = current_low;
11843 best_high = current_high;
11847 struct die_info *child = die->child;
11849 while (child && child->tag)
11851 switch (child->tag) {
11852 case DW_TAG_subprogram:
11853 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
11855 case DW_TAG_namespace:
11856 case DW_TAG_module:
11857 /* FIXME: carlton/2004-01-16: Should we do this for
11858 DW_TAG_class_type/DW_TAG_structure_type, too? I think
11859 that current GCC's always emit the DIEs corresponding
11860 to definitions of methods of classes as children of a
11861 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
11862 the DIEs giving the declarations, which could be
11863 anywhere). But I don't see any reason why the
11864 standards says that they have to be there. */
11865 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
11867 if (current_low != ((CORE_ADDR) -1))
11869 best_low = min (best_low, current_low);
11870 best_high = max (best_high, current_high);
11878 child = sibling_die (child);
11883 *highpc = best_high;
11886 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
11890 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
11891 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
11893 struct objfile *objfile = cu->objfile;
11894 struct attribute *attr;
11895 struct attribute *attr_high;
11897 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
11900 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11903 CORE_ADDR low = attr_value_as_address (attr);
11904 CORE_ADDR high = attr_value_as_address (attr_high);
11906 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
11909 record_block_range (block, baseaddr + low, baseaddr + high - 1);
11913 attr = dwarf2_attr (die, DW_AT_ranges, cu);
11916 bfd *obfd = objfile->obfd;
11917 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
11918 We take advantage of the fact that DW_AT_ranges does not appear
11919 in DW_TAG_compile_unit of DWO files. */
11920 int need_ranges_base = die->tag != DW_TAG_compile_unit;
11922 /* The value of the DW_AT_ranges attribute is the offset of the
11923 address range list in the .debug_ranges section. */
11924 unsigned long offset = (DW_UNSND (attr)
11925 + (need_ranges_base ? cu->ranges_base : 0));
11926 const gdb_byte *buffer;
11928 /* For some target architectures, but not others, the
11929 read_address function sign-extends the addresses it returns.
11930 To recognize base address selection entries, we need a
11932 unsigned int addr_size = cu->header.addr_size;
11933 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
11935 /* The base address, to which the next pair is relative. Note
11936 that this 'base' is a DWARF concept: most entries in a range
11937 list are relative, to reduce the number of relocs against the
11938 debugging information. This is separate from this function's
11939 'baseaddr' argument, which GDB uses to relocate debugging
11940 information from a shared library based on the address at
11941 which the library was loaded. */
11942 CORE_ADDR base = cu->base_address;
11943 int base_known = cu->base_known;
11945 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
11946 if (offset >= dwarf2_per_objfile->ranges.size)
11948 complaint (&symfile_complaints,
11949 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
11953 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11957 unsigned int bytes_read;
11958 CORE_ADDR start, end;
11960 start = read_address (obfd, buffer, cu, &bytes_read);
11961 buffer += bytes_read;
11962 end = read_address (obfd, buffer, cu, &bytes_read);
11963 buffer += bytes_read;
11965 /* Did we find the end of the range list? */
11966 if (start == 0 && end == 0)
11969 /* Did we find a base address selection entry? */
11970 else if ((start & base_select_mask) == base_select_mask)
11976 /* We found an ordinary address range. */
11981 complaint (&symfile_complaints,
11982 _("Invalid .debug_ranges data "
11983 "(no base address)"));
11989 /* Inverted range entries are invalid. */
11990 complaint (&symfile_complaints,
11991 _("Invalid .debug_ranges data "
11992 "(inverted range)"));
11996 /* Empty range entries have no effect. */
12000 start += base + baseaddr;
12001 end += base + baseaddr;
12003 /* A not-uncommon case of bad debug info.
12004 Don't pollute the addrmap with bad data. */
12005 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
12007 complaint (&symfile_complaints,
12008 _(".debug_ranges entry has start address of zero"
12009 " [in module %s]"), objfile_name (objfile));
12013 record_block_range (block, start, end - 1);
12019 /* Check whether the producer field indicates either of GCC < 4.6, or the
12020 Intel C/C++ compiler, and cache the result in CU. */
12023 check_producer (struct dwarf2_cu *cu)
12026 int major, minor, release;
12028 if (cu->producer == NULL)
12030 /* For unknown compilers expect their behavior is DWARF version
12033 GCC started to support .debug_types sections by -gdwarf-4 since
12034 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12035 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12036 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12037 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12039 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
12041 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
12043 cs = &cu->producer[strlen ("GNU ")];
12044 while (*cs && !isdigit (*cs))
12046 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
12048 /* Not recognized as GCC. */
12052 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12053 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12056 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
12057 cu->producer_is_icc = 1;
12060 /* For other non-GCC compilers, expect their behavior is DWARF version
12064 cu->checked_producer = 1;
12067 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12068 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12069 during 4.6.0 experimental. */
12072 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12074 if (!cu->checked_producer)
12075 check_producer (cu);
12077 return cu->producer_is_gxx_lt_4_6;
12080 /* Return the default accessibility type if it is not overriden by
12081 DW_AT_accessibility. */
12083 static enum dwarf_access_attribute
12084 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12086 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12088 /* The default DWARF 2 accessibility for members is public, the default
12089 accessibility for inheritance is private. */
12091 if (die->tag != DW_TAG_inheritance)
12092 return DW_ACCESS_public;
12094 return DW_ACCESS_private;
12098 /* DWARF 3+ defines the default accessibility a different way. The same
12099 rules apply now for DW_TAG_inheritance as for the members and it only
12100 depends on the container kind. */
12102 if (die->parent->tag == DW_TAG_class_type)
12103 return DW_ACCESS_private;
12105 return DW_ACCESS_public;
12109 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12110 offset. If the attribute was not found return 0, otherwise return
12111 1. If it was found but could not properly be handled, set *OFFSET
12115 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12118 struct attribute *attr;
12120 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12125 /* Note that we do not check for a section offset first here.
12126 This is because DW_AT_data_member_location is new in DWARF 4,
12127 so if we see it, we can assume that a constant form is really
12128 a constant and not a section offset. */
12129 if (attr_form_is_constant (attr))
12130 *offset = dwarf2_get_attr_constant_value (attr, 0);
12131 else if (attr_form_is_section_offset (attr))
12132 dwarf2_complex_location_expr_complaint ();
12133 else if (attr_form_is_block (attr))
12134 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12136 dwarf2_complex_location_expr_complaint ();
12144 /* Add an aggregate field to the field list. */
12147 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12148 struct dwarf2_cu *cu)
12150 struct objfile *objfile = cu->objfile;
12151 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12152 struct nextfield *new_field;
12153 struct attribute *attr;
12155 const char *fieldname = "";
12157 /* Allocate a new field list entry and link it in. */
12158 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
12159 make_cleanup (xfree, new_field);
12160 memset (new_field, 0, sizeof (struct nextfield));
12162 if (die->tag == DW_TAG_inheritance)
12164 new_field->next = fip->baseclasses;
12165 fip->baseclasses = new_field;
12169 new_field->next = fip->fields;
12170 fip->fields = new_field;
12174 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12176 new_field->accessibility = DW_UNSND (attr);
12178 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12179 if (new_field->accessibility != DW_ACCESS_public)
12180 fip->non_public_fields = 1;
12182 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12184 new_field->virtuality = DW_UNSND (attr);
12186 new_field->virtuality = DW_VIRTUALITY_none;
12188 fp = &new_field->field;
12190 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12194 /* Data member other than a C++ static data member. */
12196 /* Get type of field. */
12197 fp->type = die_type (die, cu);
12199 SET_FIELD_BITPOS (*fp, 0);
12201 /* Get bit size of field (zero if none). */
12202 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12205 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12209 FIELD_BITSIZE (*fp) = 0;
12212 /* Get bit offset of field. */
12213 if (handle_data_member_location (die, cu, &offset))
12214 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12215 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
12218 if (gdbarch_bits_big_endian (gdbarch))
12220 /* For big endian bits, the DW_AT_bit_offset gives the
12221 additional bit offset from the MSB of the containing
12222 anonymous object to the MSB of the field. We don't
12223 have to do anything special since we don't need to
12224 know the size of the anonymous object. */
12225 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
12229 /* For little endian bits, compute the bit offset to the
12230 MSB of the anonymous object, subtract off the number of
12231 bits from the MSB of the field to the MSB of the
12232 object, and then subtract off the number of bits of
12233 the field itself. The result is the bit offset of
12234 the LSB of the field. */
12235 int anonymous_size;
12236 int bit_offset = DW_UNSND (attr);
12238 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12241 /* The size of the anonymous object containing
12242 the bit field is explicit, so use the
12243 indicated size (in bytes). */
12244 anonymous_size = DW_UNSND (attr);
12248 /* The size of the anonymous object containing
12249 the bit field must be inferred from the type
12250 attribute of the data member containing the
12252 anonymous_size = TYPE_LENGTH (fp->type);
12254 SET_FIELD_BITPOS (*fp,
12255 (FIELD_BITPOS (*fp)
12256 + anonymous_size * bits_per_byte
12257 - bit_offset - FIELD_BITSIZE (*fp)));
12261 /* Get name of field. */
12262 fieldname = dwarf2_name (die, cu);
12263 if (fieldname == NULL)
12266 /* The name is already allocated along with this objfile, so we don't
12267 need to duplicate it for the type. */
12268 fp->name = fieldname;
12270 /* Change accessibility for artificial fields (e.g. virtual table
12271 pointer or virtual base class pointer) to private. */
12272 if (dwarf2_attr (die, DW_AT_artificial, cu))
12274 FIELD_ARTIFICIAL (*fp) = 1;
12275 new_field->accessibility = DW_ACCESS_private;
12276 fip->non_public_fields = 1;
12279 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
12281 /* C++ static member. */
12283 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
12284 is a declaration, but all versions of G++ as of this writing
12285 (so through at least 3.2.1) incorrectly generate
12286 DW_TAG_variable tags. */
12288 const char *physname;
12290 /* Get name of field. */
12291 fieldname = dwarf2_name (die, cu);
12292 if (fieldname == NULL)
12295 attr = dwarf2_attr (die, DW_AT_const_value, cu);
12297 /* Only create a symbol if this is an external value.
12298 new_symbol checks this and puts the value in the global symbol
12299 table, which we want. If it is not external, new_symbol
12300 will try to put the value in cu->list_in_scope which is wrong. */
12301 && dwarf2_flag_true_p (die, DW_AT_external, cu))
12303 /* A static const member, not much different than an enum as far as
12304 we're concerned, except that we can support more types. */
12305 new_symbol (die, NULL, cu);
12308 /* Get physical name. */
12309 physname = dwarf2_physname (fieldname, die, cu);
12311 /* The name is already allocated along with this objfile, so we don't
12312 need to duplicate it for the type. */
12313 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
12314 FIELD_TYPE (*fp) = die_type (die, cu);
12315 FIELD_NAME (*fp) = fieldname;
12317 else if (die->tag == DW_TAG_inheritance)
12321 /* C++ base class field. */
12322 if (handle_data_member_location (die, cu, &offset))
12323 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12324 FIELD_BITSIZE (*fp) = 0;
12325 FIELD_TYPE (*fp) = die_type (die, cu);
12326 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
12327 fip->nbaseclasses++;
12331 /* Add a typedef defined in the scope of the FIP's class. */
12334 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
12335 struct dwarf2_cu *cu)
12337 struct objfile *objfile = cu->objfile;
12338 struct typedef_field_list *new_field;
12339 struct attribute *attr;
12340 struct typedef_field *fp;
12341 char *fieldname = "";
12343 /* Allocate a new field list entry and link it in. */
12344 new_field = xzalloc (sizeof (*new_field));
12345 make_cleanup (xfree, new_field);
12347 gdb_assert (die->tag == DW_TAG_typedef);
12349 fp = &new_field->field;
12351 /* Get name of field. */
12352 fp->name = dwarf2_name (die, cu);
12353 if (fp->name == NULL)
12356 fp->type = read_type_die (die, cu);
12358 new_field->next = fip->typedef_field_list;
12359 fip->typedef_field_list = new_field;
12360 fip->typedef_field_list_count++;
12363 /* Create the vector of fields, and attach it to the type. */
12366 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
12367 struct dwarf2_cu *cu)
12369 int nfields = fip->nfields;
12371 /* Record the field count, allocate space for the array of fields,
12372 and create blank accessibility bitfields if necessary. */
12373 TYPE_NFIELDS (type) = nfields;
12374 TYPE_FIELDS (type) = (struct field *)
12375 TYPE_ALLOC (type, sizeof (struct field) * nfields);
12376 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
12378 if (fip->non_public_fields && cu->language != language_ada)
12380 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12382 TYPE_FIELD_PRIVATE_BITS (type) =
12383 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12384 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
12386 TYPE_FIELD_PROTECTED_BITS (type) =
12387 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12388 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
12390 TYPE_FIELD_IGNORE_BITS (type) =
12391 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12392 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
12395 /* If the type has baseclasses, allocate and clear a bit vector for
12396 TYPE_FIELD_VIRTUAL_BITS. */
12397 if (fip->nbaseclasses && cu->language != language_ada)
12399 int num_bytes = B_BYTES (fip->nbaseclasses);
12400 unsigned char *pointer;
12402 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12403 pointer = TYPE_ALLOC (type, num_bytes);
12404 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
12405 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
12406 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
12409 /* Copy the saved-up fields into the field vector. Start from the head of
12410 the list, adding to the tail of the field array, so that they end up in
12411 the same order in the array in which they were added to the list. */
12412 while (nfields-- > 0)
12414 struct nextfield *fieldp;
12418 fieldp = fip->fields;
12419 fip->fields = fieldp->next;
12423 fieldp = fip->baseclasses;
12424 fip->baseclasses = fieldp->next;
12427 TYPE_FIELD (type, nfields) = fieldp->field;
12428 switch (fieldp->accessibility)
12430 case DW_ACCESS_private:
12431 if (cu->language != language_ada)
12432 SET_TYPE_FIELD_PRIVATE (type, nfields);
12435 case DW_ACCESS_protected:
12436 if (cu->language != language_ada)
12437 SET_TYPE_FIELD_PROTECTED (type, nfields);
12440 case DW_ACCESS_public:
12444 /* Unknown accessibility. Complain and treat it as public. */
12446 complaint (&symfile_complaints, _("unsupported accessibility %d"),
12447 fieldp->accessibility);
12451 if (nfields < fip->nbaseclasses)
12453 switch (fieldp->virtuality)
12455 case DW_VIRTUALITY_virtual:
12456 case DW_VIRTUALITY_pure_virtual:
12457 if (cu->language == language_ada)
12458 error (_("unexpected virtuality in component of Ada type"));
12459 SET_TYPE_FIELD_VIRTUAL (type, nfields);
12466 /* Return true if this member function is a constructor, false
12470 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
12472 const char *fieldname;
12473 const char *typename;
12476 if (die->parent == NULL)
12479 if (die->parent->tag != DW_TAG_structure_type
12480 && die->parent->tag != DW_TAG_union_type
12481 && die->parent->tag != DW_TAG_class_type)
12484 fieldname = dwarf2_name (die, cu);
12485 typename = dwarf2_name (die->parent, cu);
12486 if (fieldname == NULL || typename == NULL)
12489 len = strlen (fieldname);
12490 return (strncmp (fieldname, typename, len) == 0
12491 && (typename[len] == '\0' || typename[len] == '<'));
12494 /* Add a member function to the proper fieldlist. */
12497 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
12498 struct type *type, struct dwarf2_cu *cu)
12500 struct objfile *objfile = cu->objfile;
12501 struct attribute *attr;
12502 struct fnfieldlist *flp;
12504 struct fn_field *fnp;
12505 const char *fieldname;
12506 struct nextfnfield *new_fnfield;
12507 struct type *this_type;
12508 enum dwarf_access_attribute accessibility;
12510 if (cu->language == language_ada)
12511 error (_("unexpected member function in Ada type"));
12513 /* Get name of member function. */
12514 fieldname = dwarf2_name (die, cu);
12515 if (fieldname == NULL)
12518 /* Look up member function name in fieldlist. */
12519 for (i = 0; i < fip->nfnfields; i++)
12521 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
12525 /* Create new list element if necessary. */
12526 if (i < fip->nfnfields)
12527 flp = &fip->fnfieldlists[i];
12530 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
12532 fip->fnfieldlists = (struct fnfieldlist *)
12533 xrealloc (fip->fnfieldlists,
12534 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
12535 * sizeof (struct fnfieldlist));
12536 if (fip->nfnfields == 0)
12537 make_cleanup (free_current_contents, &fip->fnfieldlists);
12539 flp = &fip->fnfieldlists[fip->nfnfields];
12540 flp->name = fieldname;
12543 i = fip->nfnfields++;
12546 /* Create a new member function field and chain it to the field list
12548 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
12549 make_cleanup (xfree, new_fnfield);
12550 memset (new_fnfield, 0, sizeof (struct nextfnfield));
12551 new_fnfield->next = flp->head;
12552 flp->head = new_fnfield;
12555 /* Fill in the member function field info. */
12556 fnp = &new_fnfield->fnfield;
12558 /* Delay processing of the physname until later. */
12559 if (cu->language == language_cplus || cu->language == language_java)
12561 add_to_method_list (type, i, flp->length - 1, fieldname,
12566 const char *physname = dwarf2_physname (fieldname, die, cu);
12567 fnp->physname = physname ? physname : "";
12570 fnp->type = alloc_type (objfile);
12571 this_type = read_type_die (die, cu);
12572 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
12574 int nparams = TYPE_NFIELDS (this_type);
12576 /* TYPE is the domain of this method, and THIS_TYPE is the type
12577 of the method itself (TYPE_CODE_METHOD). */
12578 smash_to_method_type (fnp->type, type,
12579 TYPE_TARGET_TYPE (this_type),
12580 TYPE_FIELDS (this_type),
12581 TYPE_NFIELDS (this_type),
12582 TYPE_VARARGS (this_type));
12584 /* Handle static member functions.
12585 Dwarf2 has no clean way to discern C++ static and non-static
12586 member functions. G++ helps GDB by marking the first
12587 parameter for non-static member functions (which is the this
12588 pointer) as artificial. We obtain this information from
12589 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
12590 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
12591 fnp->voffset = VOFFSET_STATIC;
12594 complaint (&symfile_complaints, _("member function type missing for '%s'"),
12595 dwarf2_full_name (fieldname, die, cu));
12597 /* Get fcontext from DW_AT_containing_type if present. */
12598 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12599 fnp->fcontext = die_containing_type (die, cu);
12601 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
12602 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
12604 /* Get accessibility. */
12605 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12607 accessibility = DW_UNSND (attr);
12609 accessibility = dwarf2_default_access_attribute (die, cu);
12610 switch (accessibility)
12612 case DW_ACCESS_private:
12613 fnp->is_private = 1;
12615 case DW_ACCESS_protected:
12616 fnp->is_protected = 1;
12620 /* Check for artificial methods. */
12621 attr = dwarf2_attr (die, DW_AT_artificial, cu);
12622 if (attr && DW_UNSND (attr) != 0)
12623 fnp->is_artificial = 1;
12625 fnp->is_constructor = dwarf2_is_constructor (die, cu);
12627 /* Get index in virtual function table if it is a virtual member
12628 function. For older versions of GCC, this is an offset in the
12629 appropriate virtual table, as specified by DW_AT_containing_type.
12630 For everyone else, it is an expression to be evaluated relative
12631 to the object address. */
12633 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
12636 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
12638 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
12640 /* Old-style GCC. */
12641 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
12643 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
12644 || (DW_BLOCK (attr)->size > 1
12645 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
12646 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
12648 struct dwarf_block blk;
12651 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
12653 blk.size = DW_BLOCK (attr)->size - offset;
12654 blk.data = DW_BLOCK (attr)->data + offset;
12655 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
12656 if ((fnp->voffset % cu->header.addr_size) != 0)
12657 dwarf2_complex_location_expr_complaint ();
12659 fnp->voffset /= cu->header.addr_size;
12663 dwarf2_complex_location_expr_complaint ();
12665 if (!fnp->fcontext)
12666 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
12668 else if (attr_form_is_section_offset (attr))
12670 dwarf2_complex_location_expr_complaint ();
12674 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
12680 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12681 if (attr && DW_UNSND (attr))
12683 /* GCC does this, as of 2008-08-25; PR debug/37237. */
12684 complaint (&symfile_complaints,
12685 _("Member function \"%s\" (offset %d) is virtual "
12686 "but the vtable offset is not specified"),
12687 fieldname, die->offset.sect_off);
12688 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12689 TYPE_CPLUS_DYNAMIC (type) = 1;
12694 /* Create the vector of member function fields, and attach it to the type. */
12697 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
12698 struct dwarf2_cu *cu)
12700 struct fnfieldlist *flp;
12703 if (cu->language == language_ada)
12704 error (_("unexpected member functions in Ada type"));
12706 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12707 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
12708 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
12710 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
12712 struct nextfnfield *nfp = flp->head;
12713 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
12716 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
12717 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
12718 fn_flp->fn_fields = (struct fn_field *)
12719 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
12720 for (k = flp->length; (k--, nfp); nfp = nfp->next)
12721 fn_flp->fn_fields[k] = nfp->fnfield;
12724 TYPE_NFN_FIELDS (type) = fip->nfnfields;
12727 /* Returns non-zero if NAME is the name of a vtable member in CU's
12728 language, zero otherwise. */
12730 is_vtable_name (const char *name, struct dwarf2_cu *cu)
12732 static const char vptr[] = "_vptr";
12733 static const char vtable[] = "vtable";
12735 /* Look for the C++ and Java forms of the vtable. */
12736 if ((cu->language == language_java
12737 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
12738 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
12739 && is_cplus_marker (name[sizeof (vptr) - 1])))
12745 /* GCC outputs unnamed structures that are really pointers to member
12746 functions, with the ABI-specified layout. If TYPE describes
12747 such a structure, smash it into a member function type.
12749 GCC shouldn't do this; it should just output pointer to member DIEs.
12750 This is GCC PR debug/28767. */
12753 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
12755 struct type *pfn_type, *domain_type, *new_type;
12757 /* Check for a structure with no name and two children. */
12758 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
12761 /* Check for __pfn and __delta members. */
12762 if (TYPE_FIELD_NAME (type, 0) == NULL
12763 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
12764 || TYPE_FIELD_NAME (type, 1) == NULL
12765 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
12768 /* Find the type of the method. */
12769 pfn_type = TYPE_FIELD_TYPE (type, 0);
12770 if (pfn_type == NULL
12771 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
12772 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
12775 /* Look for the "this" argument. */
12776 pfn_type = TYPE_TARGET_TYPE (pfn_type);
12777 if (TYPE_NFIELDS (pfn_type) == 0
12778 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
12779 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
12782 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
12783 new_type = alloc_type (objfile);
12784 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
12785 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
12786 TYPE_VARARGS (pfn_type));
12787 smash_to_methodptr_type (type, new_type);
12790 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
12794 producer_is_icc (struct dwarf2_cu *cu)
12796 if (!cu->checked_producer)
12797 check_producer (cu);
12799 return cu->producer_is_icc;
12802 /* Called when we find the DIE that starts a structure or union scope
12803 (definition) to create a type for the structure or union. Fill in
12804 the type's name and general properties; the members will not be
12805 processed until process_structure_scope. A symbol table entry for
12806 the type will also not be done until process_structure_scope (assuming
12807 the type has a name).
12809 NOTE: we need to call these functions regardless of whether or not the
12810 DIE has a DW_AT_name attribute, since it might be an anonymous
12811 structure or union. This gets the type entered into our set of
12812 user defined types. */
12814 static struct type *
12815 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
12817 struct objfile *objfile = cu->objfile;
12819 struct attribute *attr;
12822 /* If the definition of this type lives in .debug_types, read that type.
12823 Don't follow DW_AT_specification though, that will take us back up
12824 the chain and we want to go down. */
12825 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12828 type = get_DW_AT_signature_type (die, attr, cu);
12830 /* The type's CU may not be the same as CU.
12831 Ensure TYPE is recorded with CU in die_type_hash. */
12832 return set_die_type (die, type, cu);
12835 type = alloc_type (objfile);
12836 INIT_CPLUS_SPECIFIC (type);
12838 name = dwarf2_name (die, cu);
12841 if (cu->language == language_cplus
12842 || cu->language == language_java)
12844 const char *full_name = dwarf2_full_name (name, die, cu);
12846 /* dwarf2_full_name might have already finished building the DIE's
12847 type. If so, there is no need to continue. */
12848 if (get_die_type (die, cu) != NULL)
12849 return get_die_type (die, cu);
12851 TYPE_TAG_NAME (type) = full_name;
12852 if (die->tag == DW_TAG_structure_type
12853 || die->tag == DW_TAG_class_type)
12854 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12858 /* The name is already allocated along with this objfile, so
12859 we don't need to duplicate it for the type. */
12860 TYPE_TAG_NAME (type) = name;
12861 if (die->tag == DW_TAG_class_type)
12862 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12866 if (die->tag == DW_TAG_structure_type)
12868 TYPE_CODE (type) = TYPE_CODE_STRUCT;
12870 else if (die->tag == DW_TAG_union_type)
12872 TYPE_CODE (type) = TYPE_CODE_UNION;
12876 TYPE_CODE (type) = TYPE_CODE_CLASS;
12879 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
12880 TYPE_DECLARED_CLASS (type) = 1;
12882 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12885 TYPE_LENGTH (type) = DW_UNSND (attr);
12889 TYPE_LENGTH (type) = 0;
12892 if (producer_is_icc (cu))
12894 /* ICC does not output the required DW_AT_declaration
12895 on incomplete types, but gives them a size of zero. */
12898 TYPE_STUB_SUPPORTED (type) = 1;
12900 if (die_is_declaration (die, cu))
12901 TYPE_STUB (type) = 1;
12902 else if (attr == NULL && die->child == NULL
12903 && producer_is_realview (cu->producer))
12904 /* RealView does not output the required DW_AT_declaration
12905 on incomplete types. */
12906 TYPE_STUB (type) = 1;
12908 /* We need to add the type field to the die immediately so we don't
12909 infinitely recurse when dealing with pointers to the structure
12910 type within the structure itself. */
12911 set_die_type (die, type, cu);
12913 /* set_die_type should be already done. */
12914 set_descriptive_type (type, die, cu);
12919 /* Finish creating a structure or union type, including filling in
12920 its members and creating a symbol for it. */
12923 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
12925 struct objfile *objfile = cu->objfile;
12926 struct die_info *child_die = die->child;
12929 type = get_die_type (die, cu);
12931 type = read_structure_type (die, cu);
12933 if (die->child != NULL && ! die_is_declaration (die, cu))
12935 struct field_info fi;
12936 struct die_info *child_die;
12937 VEC (symbolp) *template_args = NULL;
12938 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
12940 memset (&fi, 0, sizeof (struct field_info));
12942 child_die = die->child;
12944 while (child_die && child_die->tag)
12946 if (child_die->tag == DW_TAG_member
12947 || child_die->tag == DW_TAG_variable)
12949 /* NOTE: carlton/2002-11-05: A C++ static data member
12950 should be a DW_TAG_member that is a declaration, but
12951 all versions of G++ as of this writing (so through at
12952 least 3.2.1) incorrectly generate DW_TAG_variable
12953 tags for them instead. */
12954 dwarf2_add_field (&fi, child_die, cu);
12956 else if (child_die->tag == DW_TAG_subprogram)
12958 /* C++ member function. */
12959 dwarf2_add_member_fn (&fi, child_die, type, cu);
12961 else if (child_die->tag == DW_TAG_inheritance)
12963 /* C++ base class field. */
12964 dwarf2_add_field (&fi, child_die, cu);
12966 else if (child_die->tag == DW_TAG_typedef)
12967 dwarf2_add_typedef (&fi, child_die, cu);
12968 else if (child_die->tag == DW_TAG_template_type_param
12969 || child_die->tag == DW_TAG_template_value_param)
12971 struct symbol *arg = new_symbol (child_die, NULL, cu);
12974 VEC_safe_push (symbolp, template_args, arg);
12977 child_die = sibling_die (child_die);
12980 /* Attach template arguments to type. */
12981 if (! VEC_empty (symbolp, template_args))
12983 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12984 TYPE_N_TEMPLATE_ARGUMENTS (type)
12985 = VEC_length (symbolp, template_args);
12986 TYPE_TEMPLATE_ARGUMENTS (type)
12987 = obstack_alloc (&objfile->objfile_obstack,
12988 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12989 * sizeof (struct symbol *)));
12990 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
12991 VEC_address (symbolp, template_args),
12992 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12993 * sizeof (struct symbol *)));
12994 VEC_free (symbolp, template_args);
12997 /* Attach fields and member functions to the type. */
12999 dwarf2_attach_fields_to_type (&fi, type, cu);
13002 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13004 /* Get the type which refers to the base class (possibly this
13005 class itself) which contains the vtable pointer for the current
13006 class from the DW_AT_containing_type attribute. This use of
13007 DW_AT_containing_type is a GNU extension. */
13009 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13011 struct type *t = die_containing_type (die, cu);
13013 TYPE_VPTR_BASETYPE (type) = t;
13018 /* Our own class provides vtbl ptr. */
13019 for (i = TYPE_NFIELDS (t) - 1;
13020 i >= TYPE_N_BASECLASSES (t);
13023 const char *fieldname = TYPE_FIELD_NAME (t, i);
13025 if (is_vtable_name (fieldname, cu))
13027 TYPE_VPTR_FIELDNO (type) = i;
13032 /* Complain if virtual function table field not found. */
13033 if (i < TYPE_N_BASECLASSES (t))
13034 complaint (&symfile_complaints,
13035 _("virtual function table pointer "
13036 "not found when defining class '%s'"),
13037 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13042 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
13045 else if (cu->producer
13046 && strncmp (cu->producer,
13047 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
13049 /* The IBM XLC compiler does not provide direct indication
13050 of the containing type, but the vtable pointer is
13051 always named __vfp. */
13055 for (i = TYPE_NFIELDS (type) - 1;
13056 i >= TYPE_N_BASECLASSES (type);
13059 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13061 TYPE_VPTR_FIELDNO (type) = i;
13062 TYPE_VPTR_BASETYPE (type) = type;
13069 /* Copy fi.typedef_field_list linked list elements content into the
13070 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13071 if (fi.typedef_field_list)
13073 int i = fi.typedef_field_list_count;
13075 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13076 TYPE_TYPEDEF_FIELD_ARRAY (type)
13077 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
13078 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13080 /* Reverse the list order to keep the debug info elements order. */
13083 struct typedef_field *dest, *src;
13085 dest = &TYPE_TYPEDEF_FIELD (type, i);
13086 src = &fi.typedef_field_list->field;
13087 fi.typedef_field_list = fi.typedef_field_list->next;
13092 do_cleanups (back_to);
13094 if (HAVE_CPLUS_STRUCT (type))
13095 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
13098 quirk_gcc_member_function_pointer (type, objfile);
13100 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13101 snapshots) has been known to create a die giving a declaration
13102 for a class that has, as a child, a die giving a definition for a
13103 nested class. So we have to process our children even if the
13104 current die is a declaration. Normally, of course, a declaration
13105 won't have any children at all. */
13107 while (child_die != NULL && child_die->tag)
13109 if (child_die->tag == DW_TAG_member
13110 || child_die->tag == DW_TAG_variable
13111 || child_die->tag == DW_TAG_inheritance
13112 || child_die->tag == DW_TAG_template_value_param
13113 || child_die->tag == DW_TAG_template_type_param)
13118 process_die (child_die, cu);
13120 child_die = sibling_die (child_die);
13123 /* Do not consider external references. According to the DWARF standard,
13124 these DIEs are identified by the fact that they have no byte_size
13125 attribute, and a declaration attribute. */
13126 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13127 || !die_is_declaration (die, cu))
13128 new_symbol (die, type, cu);
13131 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13132 update TYPE using some information only available in DIE's children. */
13135 update_enumeration_type_from_children (struct die_info *die,
13137 struct dwarf2_cu *cu)
13139 struct obstack obstack;
13140 struct die_info *child_die = die->child;
13141 int unsigned_enum = 1;
13144 struct cleanup *old_chain;
13146 obstack_init (&obstack);
13147 old_chain = make_cleanup_obstack_free (&obstack);
13149 while (child_die != NULL && child_die->tag)
13151 struct attribute *attr;
13153 const gdb_byte *bytes;
13154 struct dwarf2_locexpr_baton *baton;
13156 if (child_die->tag != DW_TAG_enumerator)
13159 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13163 name = dwarf2_name (child_die, cu);
13165 name = "<anonymous enumerator>";
13167 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13168 &value, &bytes, &baton);
13174 else if ((mask & value) != 0)
13179 /* If we already know that the enum type is neither unsigned, nor
13180 a flag type, no need to look at the rest of the enumerates. */
13181 if (!unsigned_enum && !flag_enum)
13183 child_die = sibling_die (child_die);
13187 TYPE_UNSIGNED (type) = 1;
13189 TYPE_FLAG_ENUM (type) = 1;
13191 do_cleanups (old_chain);
13194 /* Given a DW_AT_enumeration_type die, set its type. We do not
13195 complete the type's fields yet, or create any symbols. */
13197 static struct type *
13198 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13200 struct objfile *objfile = cu->objfile;
13202 struct attribute *attr;
13205 /* If the definition of this type lives in .debug_types, read that type.
13206 Don't follow DW_AT_specification though, that will take us back up
13207 the chain and we want to go down. */
13208 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13211 type = get_DW_AT_signature_type (die, attr, cu);
13213 /* The type's CU may not be the same as CU.
13214 Ensure TYPE is recorded with CU in die_type_hash. */
13215 return set_die_type (die, type, cu);
13218 type = alloc_type (objfile);
13220 TYPE_CODE (type) = TYPE_CODE_ENUM;
13221 name = dwarf2_full_name (NULL, die, cu);
13223 TYPE_TAG_NAME (type) = name;
13225 attr = dwarf2_attr (die, DW_AT_type, cu);
13228 struct type *underlying_type = die_type (die, cu);
13230 TYPE_TARGET_TYPE (type) = underlying_type;
13233 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13236 TYPE_LENGTH (type) = DW_UNSND (attr);
13240 TYPE_LENGTH (type) = 0;
13243 /* The enumeration DIE can be incomplete. In Ada, any type can be
13244 declared as private in the package spec, and then defined only
13245 inside the package body. Such types are known as Taft Amendment
13246 Types. When another package uses such a type, an incomplete DIE
13247 may be generated by the compiler. */
13248 if (die_is_declaration (die, cu))
13249 TYPE_STUB (type) = 1;
13251 /* Finish the creation of this type by using the enum's children.
13252 We must call this even when the underlying type has been provided
13253 so that we can determine if we're looking at a "flag" enum. */
13254 update_enumeration_type_from_children (die, type, cu);
13256 /* If this type has an underlying type that is not a stub, then we
13257 may use its attributes. We always use the "unsigned" attribute
13258 in this situation, because ordinarily we guess whether the type
13259 is unsigned -- but the guess can be wrong and the underlying type
13260 can tell us the reality. However, we defer to a local size
13261 attribute if one exists, because this lets the compiler override
13262 the underlying type if needed. */
13263 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13265 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13266 if (TYPE_LENGTH (type) == 0)
13267 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13270 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
13272 return set_die_type (die, type, cu);
13275 /* Given a pointer to a die which begins an enumeration, process all
13276 the dies that define the members of the enumeration, and create the
13277 symbol for the enumeration type.
13279 NOTE: We reverse the order of the element list. */
13282 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
13284 struct type *this_type;
13286 this_type = get_die_type (die, cu);
13287 if (this_type == NULL)
13288 this_type = read_enumeration_type (die, cu);
13290 if (die->child != NULL)
13292 struct die_info *child_die;
13293 struct symbol *sym;
13294 struct field *fields = NULL;
13295 int num_fields = 0;
13298 child_die = die->child;
13299 while (child_die && child_die->tag)
13301 if (child_die->tag != DW_TAG_enumerator)
13303 process_die (child_die, cu);
13307 name = dwarf2_name (child_die, cu);
13310 sym = new_symbol (child_die, this_type, cu);
13312 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
13314 fields = (struct field *)
13316 (num_fields + DW_FIELD_ALLOC_CHUNK)
13317 * sizeof (struct field));
13320 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
13321 FIELD_TYPE (fields[num_fields]) = NULL;
13322 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
13323 FIELD_BITSIZE (fields[num_fields]) = 0;
13329 child_die = sibling_die (child_die);
13334 TYPE_NFIELDS (this_type) = num_fields;
13335 TYPE_FIELDS (this_type) = (struct field *)
13336 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
13337 memcpy (TYPE_FIELDS (this_type), fields,
13338 sizeof (struct field) * num_fields);
13343 /* If we are reading an enum from a .debug_types unit, and the enum
13344 is a declaration, and the enum is not the signatured type in the
13345 unit, then we do not want to add a symbol for it. Adding a
13346 symbol would in some cases obscure the true definition of the
13347 enum, giving users an incomplete type when the definition is
13348 actually available. Note that we do not want to do this for all
13349 enums which are just declarations, because C++0x allows forward
13350 enum declarations. */
13351 if (cu->per_cu->is_debug_types
13352 && die_is_declaration (die, cu))
13354 struct signatured_type *sig_type;
13356 sig_type = (struct signatured_type *) cu->per_cu;
13357 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
13358 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
13362 new_symbol (die, this_type, cu);
13365 /* Extract all information from a DW_TAG_array_type DIE and put it in
13366 the DIE's type field. For now, this only handles one dimensional
13369 static struct type *
13370 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
13372 struct objfile *objfile = cu->objfile;
13373 struct die_info *child_die;
13375 struct type *element_type, *range_type, *index_type;
13376 struct type **range_types = NULL;
13377 struct attribute *attr;
13379 struct cleanup *back_to;
13381 unsigned int bit_stride = 0;
13383 element_type = die_type (die, cu);
13385 /* The die_type call above may have already set the type for this DIE. */
13386 type = get_die_type (die, cu);
13390 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
13392 bit_stride = DW_UNSND (attr) * 8;
13394 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
13396 bit_stride = DW_UNSND (attr);
13398 /* Irix 6.2 native cc creates array types without children for
13399 arrays with unspecified length. */
13400 if (die->child == NULL)
13402 index_type = objfile_type (objfile)->builtin_int;
13403 range_type = create_static_range_type (NULL, index_type, 0, -1);
13404 type = create_array_type_with_stride (NULL, element_type, range_type,
13406 return set_die_type (die, type, cu);
13409 back_to = make_cleanup (null_cleanup, NULL);
13410 child_die = die->child;
13411 while (child_die && child_die->tag)
13413 if (child_die->tag == DW_TAG_subrange_type)
13415 struct type *child_type = read_type_die (child_die, cu);
13417 if (child_type != NULL)
13419 /* The range type was succesfully read. Save it for the
13420 array type creation. */
13421 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
13423 range_types = (struct type **)
13424 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
13425 * sizeof (struct type *));
13427 make_cleanup (free_current_contents, &range_types);
13429 range_types[ndim++] = child_type;
13432 child_die = sibling_die (child_die);
13435 /* Dwarf2 dimensions are output from left to right, create the
13436 necessary array types in backwards order. */
13438 type = element_type;
13440 if (read_array_order (die, cu) == DW_ORD_col_major)
13445 type = create_array_type_with_stride (NULL, type, range_types[i++],
13451 type = create_array_type_with_stride (NULL, type, range_types[ndim],
13455 /* Understand Dwarf2 support for vector types (like they occur on
13456 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
13457 array type. This is not part of the Dwarf2/3 standard yet, but a
13458 custom vendor extension. The main difference between a regular
13459 array and the vector variant is that vectors are passed by value
13461 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
13463 make_vector_type (type);
13465 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
13466 implementation may choose to implement triple vectors using this
13468 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13471 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
13472 TYPE_LENGTH (type) = DW_UNSND (attr);
13474 complaint (&symfile_complaints,
13475 _("DW_AT_byte_size for array type smaller "
13476 "than the total size of elements"));
13479 name = dwarf2_name (die, cu);
13481 TYPE_NAME (type) = name;
13483 /* Install the type in the die. */
13484 set_die_type (die, type, cu);
13486 /* set_die_type should be already done. */
13487 set_descriptive_type (type, die, cu);
13489 do_cleanups (back_to);
13494 static enum dwarf_array_dim_ordering
13495 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
13497 struct attribute *attr;
13499 attr = dwarf2_attr (die, DW_AT_ordering, cu);
13501 if (attr) return DW_SND (attr);
13503 /* GNU F77 is a special case, as at 08/2004 array type info is the
13504 opposite order to the dwarf2 specification, but data is still
13505 laid out as per normal fortran.
13507 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
13508 version checking. */
13510 if (cu->language == language_fortran
13511 && cu->producer && strstr (cu->producer, "GNU F77"))
13513 return DW_ORD_row_major;
13516 switch (cu->language_defn->la_array_ordering)
13518 case array_column_major:
13519 return DW_ORD_col_major;
13520 case array_row_major:
13522 return DW_ORD_row_major;
13526 /* Extract all information from a DW_TAG_set_type DIE and put it in
13527 the DIE's type field. */
13529 static struct type *
13530 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
13532 struct type *domain_type, *set_type;
13533 struct attribute *attr;
13535 domain_type = die_type (die, cu);
13537 /* The die_type call above may have already set the type for this DIE. */
13538 set_type = get_die_type (die, cu);
13542 set_type = create_set_type (NULL, domain_type);
13544 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13546 TYPE_LENGTH (set_type) = DW_UNSND (attr);
13548 return set_die_type (die, set_type, cu);
13551 /* A helper for read_common_block that creates a locexpr baton.
13552 SYM is the symbol which we are marking as computed.
13553 COMMON_DIE is the DIE for the common block.
13554 COMMON_LOC is the location expression attribute for the common
13556 MEMBER_LOC is the location expression attribute for the particular
13557 member of the common block that we are processing.
13558 CU is the CU from which the above come. */
13561 mark_common_block_symbol_computed (struct symbol *sym,
13562 struct die_info *common_die,
13563 struct attribute *common_loc,
13564 struct attribute *member_loc,
13565 struct dwarf2_cu *cu)
13567 struct objfile *objfile = dwarf2_per_objfile->objfile;
13568 struct dwarf2_locexpr_baton *baton;
13570 unsigned int cu_off;
13571 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
13572 LONGEST offset = 0;
13574 gdb_assert (common_loc && member_loc);
13575 gdb_assert (attr_form_is_block (common_loc));
13576 gdb_assert (attr_form_is_block (member_loc)
13577 || attr_form_is_constant (member_loc));
13579 baton = obstack_alloc (&objfile->objfile_obstack,
13580 sizeof (struct dwarf2_locexpr_baton));
13581 baton->per_cu = cu->per_cu;
13582 gdb_assert (baton->per_cu);
13584 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
13586 if (attr_form_is_constant (member_loc))
13588 offset = dwarf2_get_attr_constant_value (member_loc, 0);
13589 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
13592 baton->size += DW_BLOCK (member_loc)->size;
13594 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
13597 *ptr++ = DW_OP_call4;
13598 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
13599 store_unsigned_integer (ptr, 4, byte_order, cu_off);
13602 if (attr_form_is_constant (member_loc))
13604 *ptr++ = DW_OP_addr;
13605 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
13606 ptr += cu->header.addr_size;
13610 /* We have to copy the data here, because DW_OP_call4 will only
13611 use a DW_AT_location attribute. */
13612 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
13613 ptr += DW_BLOCK (member_loc)->size;
13616 *ptr++ = DW_OP_plus;
13617 gdb_assert (ptr - baton->data == baton->size);
13619 SYMBOL_LOCATION_BATON (sym) = baton;
13620 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
13623 /* Create appropriate locally-scoped variables for all the
13624 DW_TAG_common_block entries. Also create a struct common_block
13625 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
13626 is used to sepate the common blocks name namespace from regular
13630 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
13632 struct attribute *attr;
13634 attr = dwarf2_attr (die, DW_AT_location, cu);
13637 /* Support the .debug_loc offsets. */
13638 if (attr_form_is_block (attr))
13642 else if (attr_form_is_section_offset (attr))
13644 dwarf2_complex_location_expr_complaint ();
13649 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13650 "common block member");
13655 if (die->child != NULL)
13657 struct objfile *objfile = cu->objfile;
13658 struct die_info *child_die;
13659 size_t n_entries = 0, size;
13660 struct common_block *common_block;
13661 struct symbol *sym;
13663 for (child_die = die->child;
13664 child_die && child_die->tag;
13665 child_die = sibling_die (child_die))
13668 size = (sizeof (struct common_block)
13669 + (n_entries - 1) * sizeof (struct symbol *));
13670 common_block = obstack_alloc (&objfile->objfile_obstack, size);
13671 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
13672 common_block->n_entries = 0;
13674 for (child_die = die->child;
13675 child_die && child_die->tag;
13676 child_die = sibling_die (child_die))
13678 /* Create the symbol in the DW_TAG_common_block block in the current
13680 sym = new_symbol (child_die, NULL, cu);
13683 struct attribute *member_loc;
13685 common_block->contents[common_block->n_entries++] = sym;
13687 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
13691 /* GDB has handled this for a long time, but it is
13692 not specified by DWARF. It seems to have been
13693 emitted by gfortran at least as recently as:
13694 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
13695 complaint (&symfile_complaints,
13696 _("Variable in common block has "
13697 "DW_AT_data_member_location "
13698 "- DIE at 0x%x [in module %s]"),
13699 child_die->offset.sect_off,
13700 objfile_name (cu->objfile));
13702 if (attr_form_is_section_offset (member_loc))
13703 dwarf2_complex_location_expr_complaint ();
13704 else if (attr_form_is_constant (member_loc)
13705 || attr_form_is_block (member_loc))
13708 mark_common_block_symbol_computed (sym, die, attr,
13712 dwarf2_complex_location_expr_complaint ();
13717 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
13718 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
13722 /* Create a type for a C++ namespace. */
13724 static struct type *
13725 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
13727 struct objfile *objfile = cu->objfile;
13728 const char *previous_prefix, *name;
13732 /* For extensions, reuse the type of the original namespace. */
13733 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
13735 struct die_info *ext_die;
13736 struct dwarf2_cu *ext_cu = cu;
13738 ext_die = dwarf2_extension (die, &ext_cu);
13739 type = read_type_die (ext_die, ext_cu);
13741 /* EXT_CU may not be the same as CU.
13742 Ensure TYPE is recorded with CU in die_type_hash. */
13743 return set_die_type (die, type, cu);
13746 name = namespace_name (die, &is_anonymous, cu);
13748 /* Now build the name of the current namespace. */
13750 previous_prefix = determine_prefix (die, cu);
13751 if (previous_prefix[0] != '\0')
13752 name = typename_concat (&objfile->objfile_obstack,
13753 previous_prefix, name, 0, cu);
13755 /* Create the type. */
13756 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
13758 TYPE_NAME (type) = name;
13759 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13761 return set_die_type (die, type, cu);
13764 /* Read a C++ namespace. */
13767 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
13769 struct objfile *objfile = cu->objfile;
13772 /* Add a symbol associated to this if we haven't seen the namespace
13773 before. Also, add a using directive if it's an anonymous
13776 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
13780 type = read_type_die (die, cu);
13781 new_symbol (die, type, cu);
13783 namespace_name (die, &is_anonymous, cu);
13786 const char *previous_prefix = determine_prefix (die, cu);
13788 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
13789 NULL, NULL, 0, &objfile->objfile_obstack);
13793 if (die->child != NULL)
13795 struct die_info *child_die = die->child;
13797 while (child_die && child_die->tag)
13799 process_die (child_die, cu);
13800 child_die = sibling_die (child_die);
13805 /* Read a Fortran module as type. This DIE can be only a declaration used for
13806 imported module. Still we need that type as local Fortran "use ... only"
13807 declaration imports depend on the created type in determine_prefix. */
13809 static struct type *
13810 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
13812 struct objfile *objfile = cu->objfile;
13813 const char *module_name;
13816 module_name = dwarf2_name (die, cu);
13818 complaint (&symfile_complaints,
13819 _("DW_TAG_module has no name, offset 0x%x"),
13820 die->offset.sect_off);
13821 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
13823 /* determine_prefix uses TYPE_TAG_NAME. */
13824 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13826 return set_die_type (die, type, cu);
13829 /* Read a Fortran module. */
13832 read_module (struct die_info *die, struct dwarf2_cu *cu)
13834 struct die_info *child_die = die->child;
13837 type = read_type_die (die, cu);
13838 new_symbol (die, type, cu);
13840 while (child_die && child_die->tag)
13842 process_die (child_die, cu);
13843 child_die = sibling_die (child_die);
13847 /* Return the name of the namespace represented by DIE. Set
13848 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
13851 static const char *
13852 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
13854 struct die_info *current_die;
13855 const char *name = NULL;
13857 /* Loop through the extensions until we find a name. */
13859 for (current_die = die;
13860 current_die != NULL;
13861 current_die = dwarf2_extension (die, &cu))
13863 name = dwarf2_name (current_die, cu);
13868 /* Is it an anonymous namespace? */
13870 *is_anonymous = (name == NULL);
13872 name = CP_ANONYMOUS_NAMESPACE_STR;
13877 /* Extract all information from a DW_TAG_pointer_type DIE and add to
13878 the user defined type vector. */
13880 static struct type *
13881 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
13883 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
13884 struct comp_unit_head *cu_header = &cu->header;
13886 struct attribute *attr_byte_size;
13887 struct attribute *attr_address_class;
13888 int byte_size, addr_class;
13889 struct type *target_type;
13891 target_type = die_type (die, cu);
13893 /* The die_type call above may have already set the type for this DIE. */
13894 type = get_die_type (die, cu);
13898 type = lookup_pointer_type (target_type);
13900 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
13901 if (attr_byte_size)
13902 byte_size = DW_UNSND (attr_byte_size);
13904 byte_size = cu_header->addr_size;
13906 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
13907 if (attr_address_class)
13908 addr_class = DW_UNSND (attr_address_class);
13910 addr_class = DW_ADDR_none;
13912 /* If the pointer size or address class is different than the
13913 default, create a type variant marked as such and set the
13914 length accordingly. */
13915 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
13917 if (gdbarch_address_class_type_flags_p (gdbarch))
13921 type_flags = gdbarch_address_class_type_flags
13922 (gdbarch, byte_size, addr_class);
13923 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
13925 type = make_type_with_address_space (type, type_flags);
13927 else if (TYPE_LENGTH (type) != byte_size)
13929 complaint (&symfile_complaints,
13930 _("invalid pointer size %d"), byte_size);
13934 /* Should we also complain about unhandled address classes? */
13938 TYPE_LENGTH (type) = byte_size;
13939 return set_die_type (die, type, cu);
13942 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
13943 the user defined type vector. */
13945 static struct type *
13946 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
13949 struct type *to_type;
13950 struct type *domain;
13952 to_type = die_type (die, cu);
13953 domain = die_containing_type (die, cu);
13955 /* The calls above may have already set the type for this DIE. */
13956 type = get_die_type (die, cu);
13960 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
13961 type = lookup_methodptr_type (to_type);
13962 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
13964 struct type *new_type = alloc_type (cu->objfile);
13966 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
13967 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
13968 TYPE_VARARGS (to_type));
13969 type = lookup_methodptr_type (new_type);
13972 type = lookup_memberptr_type (to_type, domain);
13974 return set_die_type (die, type, cu);
13977 /* Extract all information from a DW_TAG_reference_type DIE and add to
13978 the user defined type vector. */
13980 static struct type *
13981 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
13983 struct comp_unit_head *cu_header = &cu->header;
13984 struct type *type, *target_type;
13985 struct attribute *attr;
13987 target_type = die_type (die, cu);
13989 /* The die_type call above may have already set the type for this DIE. */
13990 type = get_die_type (die, cu);
13994 type = lookup_reference_type (target_type);
13995 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13998 TYPE_LENGTH (type) = DW_UNSND (attr);
14002 TYPE_LENGTH (type) = cu_header->addr_size;
14004 return set_die_type (die, type, cu);
14007 static struct type *
14008 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14010 struct type *base_type, *cv_type;
14012 base_type = die_type (die, cu);
14014 /* The die_type call above may have already set the type for this DIE. */
14015 cv_type = get_die_type (die, cu);
14019 /* In case the const qualifier is applied to an array type, the element type
14020 is so qualified, not the array type (section 6.7.3 of C99). */
14021 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14023 struct type *el_type, *inner_array;
14025 base_type = copy_type (base_type);
14026 inner_array = base_type;
14028 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14030 TYPE_TARGET_TYPE (inner_array) =
14031 copy_type (TYPE_TARGET_TYPE (inner_array));
14032 inner_array = TYPE_TARGET_TYPE (inner_array);
14035 el_type = TYPE_TARGET_TYPE (inner_array);
14036 TYPE_TARGET_TYPE (inner_array) =
14037 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
14039 return set_die_type (die, base_type, cu);
14042 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14043 return set_die_type (die, cv_type, cu);
14046 static struct type *
14047 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14049 struct type *base_type, *cv_type;
14051 base_type = die_type (die, cu);
14053 /* The die_type call above may have already set the type for this DIE. */
14054 cv_type = get_die_type (die, cu);
14058 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14059 return set_die_type (die, cv_type, cu);
14062 /* Handle DW_TAG_restrict_type. */
14064 static struct type *
14065 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14067 struct type *base_type, *cv_type;
14069 base_type = die_type (die, cu);
14071 /* The die_type call above may have already set the type for this DIE. */
14072 cv_type = get_die_type (die, cu);
14076 cv_type = make_restrict_type (base_type);
14077 return set_die_type (die, cv_type, cu);
14080 /* Extract all information from a DW_TAG_string_type DIE and add to
14081 the user defined type vector. It isn't really a user defined type,
14082 but it behaves like one, with other DIE's using an AT_user_def_type
14083 attribute to reference it. */
14085 static struct type *
14086 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14088 struct objfile *objfile = cu->objfile;
14089 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14090 struct type *type, *range_type, *index_type, *char_type;
14091 struct attribute *attr;
14092 unsigned int length;
14094 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14097 length = DW_UNSND (attr);
14101 /* Check for the DW_AT_byte_size attribute. */
14102 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14105 length = DW_UNSND (attr);
14113 index_type = objfile_type (objfile)->builtin_int;
14114 range_type = create_static_range_type (NULL, index_type, 1, length);
14115 char_type = language_string_char_type (cu->language_defn, gdbarch);
14116 type = create_string_type (NULL, char_type, range_type);
14118 return set_die_type (die, type, cu);
14121 /* Assuming that DIE corresponds to a function, returns nonzero
14122 if the function is prototyped. */
14125 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14127 struct attribute *attr;
14129 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14130 if (attr && (DW_UNSND (attr) != 0))
14133 /* The DWARF standard implies that the DW_AT_prototyped attribute
14134 is only meaninful for C, but the concept also extends to other
14135 languages that allow unprototyped functions (Eg: Objective C).
14136 For all other languages, assume that functions are always
14138 if (cu->language != language_c
14139 && cu->language != language_objc
14140 && cu->language != language_opencl)
14143 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14144 prototyped and unprototyped functions; default to prototyped,
14145 since that is more common in modern code (and RealView warns
14146 about unprototyped functions). */
14147 if (producer_is_realview (cu->producer))
14153 /* Handle DIES due to C code like:
14157 int (*funcp)(int a, long l);
14161 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14163 static struct type *
14164 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14166 struct objfile *objfile = cu->objfile;
14167 struct type *type; /* Type that this function returns. */
14168 struct type *ftype; /* Function that returns above type. */
14169 struct attribute *attr;
14171 type = die_type (die, cu);
14173 /* The die_type call above may have already set the type for this DIE. */
14174 ftype = get_die_type (die, cu);
14178 ftype = lookup_function_type (type);
14180 if (prototyped_function_p (die, cu))
14181 TYPE_PROTOTYPED (ftype) = 1;
14183 /* Store the calling convention in the type if it's available in
14184 the subroutine die. Otherwise set the calling convention to
14185 the default value DW_CC_normal. */
14186 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14188 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14189 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14190 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14192 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14194 /* We need to add the subroutine type to the die immediately so
14195 we don't infinitely recurse when dealing with parameters
14196 declared as the same subroutine type. */
14197 set_die_type (die, ftype, cu);
14199 if (die->child != NULL)
14201 struct type *void_type = objfile_type (objfile)->builtin_void;
14202 struct die_info *child_die;
14203 int nparams, iparams;
14205 /* Count the number of parameters.
14206 FIXME: GDB currently ignores vararg functions, but knows about
14207 vararg member functions. */
14209 child_die = die->child;
14210 while (child_die && child_die->tag)
14212 if (child_die->tag == DW_TAG_formal_parameter)
14214 else if (child_die->tag == DW_TAG_unspecified_parameters)
14215 TYPE_VARARGS (ftype) = 1;
14216 child_die = sibling_die (child_die);
14219 /* Allocate storage for parameters and fill them in. */
14220 TYPE_NFIELDS (ftype) = nparams;
14221 TYPE_FIELDS (ftype) = (struct field *)
14222 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
14224 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
14225 even if we error out during the parameters reading below. */
14226 for (iparams = 0; iparams < nparams; iparams++)
14227 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
14230 child_die = die->child;
14231 while (child_die && child_die->tag)
14233 if (child_die->tag == DW_TAG_formal_parameter)
14235 struct type *arg_type;
14237 /* DWARF version 2 has no clean way to discern C++
14238 static and non-static member functions. G++ helps
14239 GDB by marking the first parameter for non-static
14240 member functions (which is the this pointer) as
14241 artificial. We pass this information to
14242 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
14244 DWARF version 3 added DW_AT_object_pointer, which GCC
14245 4.5 does not yet generate. */
14246 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
14248 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
14251 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
14253 /* GCC/43521: In java, the formal parameter
14254 "this" is sometimes not marked with DW_AT_artificial. */
14255 if (cu->language == language_java)
14257 const char *name = dwarf2_name (child_die, cu);
14259 if (name && !strcmp (name, "this"))
14260 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
14263 arg_type = die_type (child_die, cu);
14265 /* RealView does not mark THIS as const, which the testsuite
14266 expects. GCC marks THIS as const in method definitions,
14267 but not in the class specifications (GCC PR 43053). */
14268 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
14269 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
14272 struct dwarf2_cu *arg_cu = cu;
14273 const char *name = dwarf2_name (child_die, cu);
14275 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
14278 /* If the compiler emits this, use it. */
14279 if (follow_die_ref (die, attr, &arg_cu) == child_die)
14282 else if (name && strcmp (name, "this") == 0)
14283 /* Function definitions will have the argument names. */
14285 else if (name == NULL && iparams == 0)
14286 /* Declarations may not have the names, so like
14287 elsewhere in GDB, assume an artificial first
14288 argument is "this". */
14292 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
14296 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
14299 child_die = sibling_die (child_die);
14306 static struct type *
14307 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
14309 struct objfile *objfile = cu->objfile;
14310 const char *name = NULL;
14311 struct type *this_type, *target_type;
14313 name = dwarf2_full_name (NULL, die, cu);
14314 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
14315 TYPE_FLAG_TARGET_STUB, NULL, objfile);
14316 TYPE_NAME (this_type) = name;
14317 set_die_type (die, this_type, cu);
14318 target_type = die_type (die, cu);
14319 if (target_type != this_type)
14320 TYPE_TARGET_TYPE (this_type) = target_type;
14323 /* Self-referential typedefs are, it seems, not allowed by the DWARF
14324 spec and cause infinite loops in GDB. */
14325 complaint (&symfile_complaints,
14326 _("Self-referential DW_TAG_typedef "
14327 "- DIE at 0x%x [in module %s]"),
14328 die->offset.sect_off, objfile_name (objfile));
14329 TYPE_TARGET_TYPE (this_type) = NULL;
14334 /* Find a representation of a given base type and install
14335 it in the TYPE field of the die. */
14337 static struct type *
14338 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
14340 struct objfile *objfile = cu->objfile;
14342 struct attribute *attr;
14343 int encoding = 0, size = 0;
14345 enum type_code code = TYPE_CODE_INT;
14346 int type_flags = 0;
14347 struct type *target_type = NULL;
14349 attr = dwarf2_attr (die, DW_AT_encoding, cu);
14352 encoding = DW_UNSND (attr);
14354 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14357 size = DW_UNSND (attr);
14359 name = dwarf2_name (die, cu);
14362 complaint (&symfile_complaints,
14363 _("DW_AT_name missing from DW_TAG_base_type"));
14368 case DW_ATE_address:
14369 /* Turn DW_ATE_address into a void * pointer. */
14370 code = TYPE_CODE_PTR;
14371 type_flags |= TYPE_FLAG_UNSIGNED;
14372 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
14374 case DW_ATE_boolean:
14375 code = TYPE_CODE_BOOL;
14376 type_flags |= TYPE_FLAG_UNSIGNED;
14378 case DW_ATE_complex_float:
14379 code = TYPE_CODE_COMPLEX;
14380 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
14382 case DW_ATE_decimal_float:
14383 code = TYPE_CODE_DECFLOAT;
14386 code = TYPE_CODE_FLT;
14388 case DW_ATE_signed:
14390 case DW_ATE_unsigned:
14391 type_flags |= TYPE_FLAG_UNSIGNED;
14392 if (cu->language == language_fortran
14394 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
14395 code = TYPE_CODE_CHAR;
14397 case DW_ATE_signed_char:
14398 if (cu->language == language_ada || cu->language == language_m2
14399 || cu->language == language_pascal
14400 || cu->language == language_fortran)
14401 code = TYPE_CODE_CHAR;
14403 case DW_ATE_unsigned_char:
14404 if (cu->language == language_ada || cu->language == language_m2
14405 || cu->language == language_pascal
14406 || cu->language == language_fortran)
14407 code = TYPE_CODE_CHAR;
14408 type_flags |= TYPE_FLAG_UNSIGNED;
14411 /* We just treat this as an integer and then recognize the
14412 type by name elsewhere. */
14416 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
14417 dwarf_type_encoding_name (encoding));
14421 type = init_type (code, size, type_flags, NULL, objfile);
14422 TYPE_NAME (type) = name;
14423 TYPE_TARGET_TYPE (type) = target_type;
14425 if (name && strcmp (name, "char") == 0)
14426 TYPE_NOSIGN (type) = 1;
14428 return set_die_type (die, type, cu);
14431 /* Parse dwarf attribute if it's a block, reference or constant and put the
14432 resulting value of the attribute into struct bound_prop.
14433 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
14436 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
14437 struct dwarf2_cu *cu, struct dynamic_prop *prop)
14439 struct dwarf2_property_baton *baton;
14440 struct obstack *obstack = &cu->objfile->objfile_obstack;
14442 if (attr == NULL || prop == NULL)
14445 if (attr_form_is_block (attr))
14447 baton = obstack_alloc (obstack, sizeof (*baton));
14448 baton->referenced_type = NULL;
14449 baton->locexpr.per_cu = cu->per_cu;
14450 baton->locexpr.size = DW_BLOCK (attr)->size;
14451 baton->locexpr.data = DW_BLOCK (attr)->data;
14452 prop->data.baton = baton;
14453 prop->kind = PROP_LOCEXPR;
14454 gdb_assert (prop->data.baton != NULL);
14456 else if (attr_form_is_ref (attr))
14458 struct dwarf2_cu *target_cu = cu;
14459 struct die_info *target_die;
14460 struct attribute *target_attr;
14462 target_die = follow_die_ref (die, attr, &target_cu);
14463 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
14464 if (target_attr == NULL)
14467 if (attr_form_is_section_offset (target_attr))
14469 baton = obstack_alloc (obstack, sizeof (*baton));
14470 baton->referenced_type = die_type (target_die, target_cu);
14471 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
14472 prop->data.baton = baton;
14473 prop->kind = PROP_LOCLIST;
14474 gdb_assert (prop->data.baton != NULL);
14476 else if (attr_form_is_block (target_attr))
14478 baton = obstack_alloc (obstack, sizeof (*baton));
14479 baton->referenced_type = die_type (target_die, target_cu);
14480 baton->locexpr.per_cu = cu->per_cu;
14481 baton->locexpr.size = DW_BLOCK (target_attr)->size;
14482 baton->locexpr.data = DW_BLOCK (target_attr)->data;
14483 prop->data.baton = baton;
14484 prop->kind = PROP_LOCEXPR;
14485 gdb_assert (prop->data.baton != NULL);
14489 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14490 "dynamic property");
14494 else if (attr_form_is_constant (attr))
14496 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
14497 prop->kind = PROP_CONST;
14501 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
14502 dwarf2_name (die, cu));
14509 /* Read the given DW_AT_subrange DIE. */
14511 static struct type *
14512 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
14514 struct type *base_type, *orig_base_type;
14515 struct type *range_type;
14516 struct attribute *attr;
14517 struct dynamic_prop low, high;
14518 int low_default_is_valid;
14519 int high_bound_is_count = 0;
14521 LONGEST negative_mask;
14523 orig_base_type = die_type (die, cu);
14524 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
14525 whereas the real type might be. So, we use ORIG_BASE_TYPE when
14526 creating the range type, but we use the result of check_typedef
14527 when examining properties of the type. */
14528 base_type = check_typedef (orig_base_type);
14530 /* The die_type call above may have already set the type for this DIE. */
14531 range_type = get_die_type (die, cu);
14535 low.kind = PROP_CONST;
14536 high.kind = PROP_CONST;
14537 high.data.const_val = 0;
14539 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
14540 omitting DW_AT_lower_bound. */
14541 switch (cu->language)
14544 case language_cplus:
14545 low.data.const_val = 0;
14546 low_default_is_valid = 1;
14548 case language_fortran:
14549 low.data.const_val = 1;
14550 low_default_is_valid = 1;
14553 case language_java:
14554 case language_objc:
14555 low.data.const_val = 0;
14556 low_default_is_valid = (cu->header.version >= 4);
14560 case language_pascal:
14561 low.data.const_val = 1;
14562 low_default_is_valid = (cu->header.version >= 4);
14565 low.data.const_val = 0;
14566 low_default_is_valid = 0;
14570 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
14572 attr_to_dynamic_prop (attr, die, cu, &low);
14573 else if (!low_default_is_valid)
14574 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
14575 "- DIE at 0x%x [in module %s]"),
14576 die->offset.sect_off, objfile_name (cu->objfile));
14578 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
14579 if (!attr_to_dynamic_prop (attr, die, cu, &high))
14581 attr = dwarf2_attr (die, DW_AT_count, cu);
14582 if (attr_to_dynamic_prop (attr, die, cu, &high))
14584 /* If bounds are constant do the final calculation here. */
14585 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
14586 high.data.const_val = low.data.const_val + high.data.const_val - 1;
14588 high_bound_is_count = 1;
14592 /* Dwarf-2 specifications explicitly allows to create subrange types
14593 without specifying a base type.
14594 In that case, the base type must be set to the type of
14595 the lower bound, upper bound or count, in that order, if any of these
14596 three attributes references an object that has a type.
14597 If no base type is found, the Dwarf-2 specifications say that
14598 a signed integer type of size equal to the size of an address should
14600 For the following C code: `extern char gdb_int [];'
14601 GCC produces an empty range DIE.
14602 FIXME: muller/2010-05-28: Possible references to object for low bound,
14603 high bound or count are not yet handled by this code. */
14604 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
14606 struct objfile *objfile = cu->objfile;
14607 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14608 int addr_size = gdbarch_addr_bit (gdbarch) /8;
14609 struct type *int_type = objfile_type (objfile)->builtin_int;
14611 /* Test "int", "long int", and "long long int" objfile types,
14612 and select the first one having a size above or equal to the
14613 architecture address size. */
14614 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14615 base_type = int_type;
14618 int_type = objfile_type (objfile)->builtin_long;
14619 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14620 base_type = int_type;
14623 int_type = objfile_type (objfile)->builtin_long_long;
14624 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14625 base_type = int_type;
14630 /* Normally, the DWARF producers are expected to use a signed
14631 constant form (Eg. DW_FORM_sdata) to express negative bounds.
14632 But this is unfortunately not always the case, as witnessed
14633 with GCC, for instance, where the ambiguous DW_FORM_dataN form
14634 is used instead. To work around that ambiguity, we treat
14635 the bounds as signed, and thus sign-extend their values, when
14636 the base type is signed. */
14638 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
14639 if (low.kind == PROP_CONST
14640 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
14641 low.data.const_val |= negative_mask;
14642 if (high.kind == PROP_CONST
14643 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
14644 high.data.const_val |= negative_mask;
14646 range_type = create_range_type (NULL, orig_base_type, &low, &high);
14648 if (high_bound_is_count)
14649 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
14651 /* Ada expects an empty array on no boundary attributes. */
14652 if (attr == NULL && cu->language != language_ada)
14653 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
14655 name = dwarf2_name (die, cu);
14657 TYPE_NAME (range_type) = name;
14659 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14661 TYPE_LENGTH (range_type) = DW_UNSND (attr);
14663 set_die_type (die, range_type, cu);
14665 /* set_die_type should be already done. */
14666 set_descriptive_type (range_type, die, cu);
14671 static struct type *
14672 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
14676 /* For now, we only support the C meaning of an unspecified type: void. */
14678 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
14679 TYPE_NAME (type) = dwarf2_name (die, cu);
14681 return set_die_type (die, type, cu);
14684 /* Read a single die and all its descendents. Set the die's sibling
14685 field to NULL; set other fields in the die correctly, and set all
14686 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
14687 location of the info_ptr after reading all of those dies. PARENT
14688 is the parent of the die in question. */
14690 static struct die_info *
14691 read_die_and_children (const struct die_reader_specs *reader,
14692 const gdb_byte *info_ptr,
14693 const gdb_byte **new_info_ptr,
14694 struct die_info *parent)
14696 struct die_info *die;
14697 const gdb_byte *cur_ptr;
14700 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
14703 *new_info_ptr = cur_ptr;
14706 store_in_ref_table (die, reader->cu);
14709 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
14713 *new_info_ptr = cur_ptr;
14716 die->sibling = NULL;
14717 die->parent = parent;
14721 /* Read a die, all of its descendents, and all of its siblings; set
14722 all of the fields of all of the dies correctly. Arguments are as
14723 in read_die_and_children. */
14725 static struct die_info *
14726 read_die_and_siblings_1 (const struct die_reader_specs *reader,
14727 const gdb_byte *info_ptr,
14728 const gdb_byte **new_info_ptr,
14729 struct die_info *parent)
14731 struct die_info *first_die, *last_sibling;
14732 const gdb_byte *cur_ptr;
14734 cur_ptr = info_ptr;
14735 first_die = last_sibling = NULL;
14739 struct die_info *die
14740 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
14744 *new_info_ptr = cur_ptr;
14751 last_sibling->sibling = die;
14753 last_sibling = die;
14757 /* Read a die, all of its descendents, and all of its siblings; set
14758 all of the fields of all of the dies correctly. Arguments are as
14759 in read_die_and_children.
14760 This the main entry point for reading a DIE and all its children. */
14762 static struct die_info *
14763 read_die_and_siblings (const struct die_reader_specs *reader,
14764 const gdb_byte *info_ptr,
14765 const gdb_byte **new_info_ptr,
14766 struct die_info *parent)
14768 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
14769 new_info_ptr, parent);
14771 if (dwarf2_die_debug)
14773 fprintf_unfiltered (gdb_stdlog,
14774 "Read die from %s@0x%x of %s:\n",
14775 get_section_name (reader->die_section),
14776 (unsigned) (info_ptr - reader->die_section->buffer),
14777 bfd_get_filename (reader->abfd));
14778 dump_die (die, dwarf2_die_debug);
14784 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
14786 The caller is responsible for filling in the extra attributes
14787 and updating (*DIEP)->num_attrs.
14788 Set DIEP to point to a newly allocated die with its information,
14789 except for its child, sibling, and parent fields.
14790 Set HAS_CHILDREN to tell whether the die has children or not. */
14792 static const gdb_byte *
14793 read_full_die_1 (const struct die_reader_specs *reader,
14794 struct die_info **diep, const gdb_byte *info_ptr,
14795 int *has_children, int num_extra_attrs)
14797 unsigned int abbrev_number, bytes_read, i;
14798 sect_offset offset;
14799 struct abbrev_info *abbrev;
14800 struct die_info *die;
14801 struct dwarf2_cu *cu = reader->cu;
14802 bfd *abfd = reader->abfd;
14804 offset.sect_off = info_ptr - reader->buffer;
14805 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14806 info_ptr += bytes_read;
14807 if (!abbrev_number)
14814 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
14816 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
14818 bfd_get_filename (abfd));
14820 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
14821 die->offset = offset;
14822 die->tag = abbrev->tag;
14823 die->abbrev = abbrev_number;
14825 /* Make the result usable.
14826 The caller needs to update num_attrs after adding the extra
14828 die->num_attrs = abbrev->num_attrs;
14830 for (i = 0; i < abbrev->num_attrs; ++i)
14831 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
14835 *has_children = abbrev->has_children;
14839 /* Read a die and all its attributes.
14840 Set DIEP to point to a newly allocated die with its information,
14841 except for its child, sibling, and parent fields.
14842 Set HAS_CHILDREN to tell whether the die has children or not. */
14844 static const gdb_byte *
14845 read_full_die (const struct die_reader_specs *reader,
14846 struct die_info **diep, const gdb_byte *info_ptr,
14849 const gdb_byte *result;
14851 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
14853 if (dwarf2_die_debug)
14855 fprintf_unfiltered (gdb_stdlog,
14856 "Read die from %s@0x%x of %s:\n",
14857 get_section_name (reader->die_section),
14858 (unsigned) (info_ptr - reader->die_section->buffer),
14859 bfd_get_filename (reader->abfd));
14860 dump_die (*diep, dwarf2_die_debug);
14866 /* Abbreviation tables.
14868 In DWARF version 2, the description of the debugging information is
14869 stored in a separate .debug_abbrev section. Before we read any
14870 dies from a section we read in all abbreviations and install them
14871 in a hash table. */
14873 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
14875 static struct abbrev_info *
14876 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
14878 struct abbrev_info *abbrev;
14880 abbrev = (struct abbrev_info *)
14881 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
14882 memset (abbrev, 0, sizeof (struct abbrev_info));
14886 /* Add an abbreviation to the table. */
14889 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
14890 unsigned int abbrev_number,
14891 struct abbrev_info *abbrev)
14893 unsigned int hash_number;
14895 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14896 abbrev->next = abbrev_table->abbrevs[hash_number];
14897 abbrev_table->abbrevs[hash_number] = abbrev;
14900 /* Look up an abbrev in the table.
14901 Returns NULL if the abbrev is not found. */
14903 static struct abbrev_info *
14904 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
14905 unsigned int abbrev_number)
14907 unsigned int hash_number;
14908 struct abbrev_info *abbrev;
14910 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14911 abbrev = abbrev_table->abbrevs[hash_number];
14915 if (abbrev->number == abbrev_number)
14917 abbrev = abbrev->next;
14922 /* Read in an abbrev table. */
14924 static struct abbrev_table *
14925 abbrev_table_read_table (struct dwarf2_section_info *section,
14926 sect_offset offset)
14928 struct objfile *objfile = dwarf2_per_objfile->objfile;
14929 bfd *abfd = get_section_bfd_owner (section);
14930 struct abbrev_table *abbrev_table;
14931 const gdb_byte *abbrev_ptr;
14932 struct abbrev_info *cur_abbrev;
14933 unsigned int abbrev_number, bytes_read, abbrev_name;
14934 unsigned int abbrev_form;
14935 struct attr_abbrev *cur_attrs;
14936 unsigned int allocated_attrs;
14938 abbrev_table = XNEW (struct abbrev_table);
14939 abbrev_table->offset = offset;
14940 obstack_init (&abbrev_table->abbrev_obstack);
14941 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
14943 * sizeof (struct abbrev_info *)));
14944 memset (abbrev_table->abbrevs, 0,
14945 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
14947 dwarf2_read_section (objfile, section);
14948 abbrev_ptr = section->buffer + offset.sect_off;
14949 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14950 abbrev_ptr += bytes_read;
14952 allocated_attrs = ATTR_ALLOC_CHUNK;
14953 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
14955 /* Loop until we reach an abbrev number of 0. */
14956 while (abbrev_number)
14958 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
14960 /* read in abbrev header */
14961 cur_abbrev->number = abbrev_number;
14962 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14963 abbrev_ptr += bytes_read;
14964 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
14967 /* now read in declarations */
14968 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14969 abbrev_ptr += bytes_read;
14970 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14971 abbrev_ptr += bytes_read;
14972 while (abbrev_name)
14974 if (cur_abbrev->num_attrs == allocated_attrs)
14976 allocated_attrs += ATTR_ALLOC_CHUNK;
14978 = xrealloc (cur_attrs, (allocated_attrs
14979 * sizeof (struct attr_abbrev)));
14982 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
14983 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
14984 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14985 abbrev_ptr += bytes_read;
14986 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14987 abbrev_ptr += bytes_read;
14990 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
14991 (cur_abbrev->num_attrs
14992 * sizeof (struct attr_abbrev)));
14993 memcpy (cur_abbrev->attrs, cur_attrs,
14994 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
14996 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
14998 /* Get next abbreviation.
14999 Under Irix6 the abbreviations for a compilation unit are not
15000 always properly terminated with an abbrev number of 0.
15001 Exit loop if we encounter an abbreviation which we have
15002 already read (which means we are about to read the abbreviations
15003 for the next compile unit) or if the end of the abbreviation
15004 table is reached. */
15005 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15007 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15008 abbrev_ptr += bytes_read;
15009 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15014 return abbrev_table;
15017 /* Free the resources held by ABBREV_TABLE. */
15020 abbrev_table_free (struct abbrev_table *abbrev_table)
15022 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15023 xfree (abbrev_table);
15026 /* Same as abbrev_table_free but as a cleanup.
15027 We pass in a pointer to the pointer to the table so that we can
15028 set the pointer to NULL when we're done. It also simplifies
15029 build_type_unit_groups. */
15032 abbrev_table_free_cleanup (void *table_ptr)
15034 struct abbrev_table **abbrev_table_ptr = table_ptr;
15036 if (*abbrev_table_ptr != NULL)
15037 abbrev_table_free (*abbrev_table_ptr);
15038 *abbrev_table_ptr = NULL;
15041 /* Read the abbrev table for CU from ABBREV_SECTION. */
15044 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15045 struct dwarf2_section_info *abbrev_section)
15048 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
15051 /* Release the memory used by the abbrev table for a compilation unit. */
15054 dwarf2_free_abbrev_table (void *ptr_to_cu)
15056 struct dwarf2_cu *cu = ptr_to_cu;
15058 if (cu->abbrev_table != NULL)
15059 abbrev_table_free (cu->abbrev_table);
15060 /* Set this to NULL so that we SEGV if we try to read it later,
15061 and also because free_comp_unit verifies this is NULL. */
15062 cu->abbrev_table = NULL;
15065 /* Returns nonzero if TAG represents a type that we might generate a partial
15069 is_type_tag_for_partial (int tag)
15074 /* Some types that would be reasonable to generate partial symbols for,
15075 that we don't at present. */
15076 case DW_TAG_array_type:
15077 case DW_TAG_file_type:
15078 case DW_TAG_ptr_to_member_type:
15079 case DW_TAG_set_type:
15080 case DW_TAG_string_type:
15081 case DW_TAG_subroutine_type:
15083 case DW_TAG_base_type:
15084 case DW_TAG_class_type:
15085 case DW_TAG_interface_type:
15086 case DW_TAG_enumeration_type:
15087 case DW_TAG_structure_type:
15088 case DW_TAG_subrange_type:
15089 case DW_TAG_typedef:
15090 case DW_TAG_union_type:
15097 /* Load all DIEs that are interesting for partial symbols into memory. */
15099 static struct partial_die_info *
15100 load_partial_dies (const struct die_reader_specs *reader,
15101 const gdb_byte *info_ptr, int building_psymtab)
15103 struct dwarf2_cu *cu = reader->cu;
15104 struct objfile *objfile = cu->objfile;
15105 struct partial_die_info *part_die;
15106 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15107 struct abbrev_info *abbrev;
15108 unsigned int bytes_read;
15109 unsigned int load_all = 0;
15110 int nesting_level = 1;
15115 gdb_assert (cu->per_cu != NULL);
15116 if (cu->per_cu->load_all_dies)
15120 = htab_create_alloc_ex (cu->header.length / 12,
15124 &cu->comp_unit_obstack,
15125 hashtab_obstack_allocate,
15126 dummy_obstack_deallocate);
15128 part_die = obstack_alloc (&cu->comp_unit_obstack,
15129 sizeof (struct partial_die_info));
15133 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15135 /* A NULL abbrev means the end of a series of children. */
15136 if (abbrev == NULL)
15138 if (--nesting_level == 0)
15140 /* PART_DIE was probably the last thing allocated on the
15141 comp_unit_obstack, so we could call obstack_free
15142 here. We don't do that because the waste is small,
15143 and will be cleaned up when we're done with this
15144 compilation unit. This way, we're also more robust
15145 against other users of the comp_unit_obstack. */
15148 info_ptr += bytes_read;
15149 last_die = parent_die;
15150 parent_die = parent_die->die_parent;
15154 /* Check for template arguments. We never save these; if
15155 they're seen, we just mark the parent, and go on our way. */
15156 if (parent_die != NULL
15157 && cu->language == language_cplus
15158 && (abbrev->tag == DW_TAG_template_type_param
15159 || abbrev->tag == DW_TAG_template_value_param))
15161 parent_die->has_template_arguments = 1;
15165 /* We don't need a partial DIE for the template argument. */
15166 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15171 /* We only recurse into c++ subprograms looking for template arguments.
15172 Skip their other children. */
15174 && cu->language == language_cplus
15175 && parent_die != NULL
15176 && parent_die->tag == DW_TAG_subprogram)
15178 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15182 /* Check whether this DIE is interesting enough to save. Normally
15183 we would not be interested in members here, but there may be
15184 later variables referencing them via DW_AT_specification (for
15185 static members). */
15187 && !is_type_tag_for_partial (abbrev->tag)
15188 && abbrev->tag != DW_TAG_constant
15189 && abbrev->tag != DW_TAG_enumerator
15190 && abbrev->tag != DW_TAG_subprogram
15191 && abbrev->tag != DW_TAG_lexical_block
15192 && abbrev->tag != DW_TAG_variable
15193 && abbrev->tag != DW_TAG_namespace
15194 && abbrev->tag != DW_TAG_module
15195 && abbrev->tag != DW_TAG_member
15196 && abbrev->tag != DW_TAG_imported_unit
15197 && abbrev->tag != DW_TAG_imported_declaration)
15199 /* Otherwise we skip to the next sibling, if any. */
15200 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15204 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
15207 /* This two-pass algorithm for processing partial symbols has a
15208 high cost in cache pressure. Thus, handle some simple cases
15209 here which cover the majority of C partial symbols. DIEs
15210 which neither have specification tags in them, nor could have
15211 specification tags elsewhere pointing at them, can simply be
15212 processed and discarded.
15214 This segment is also optional; scan_partial_symbols and
15215 add_partial_symbol will handle these DIEs if we chain
15216 them in normally. When compilers which do not emit large
15217 quantities of duplicate debug information are more common,
15218 this code can probably be removed. */
15220 /* Any complete simple types at the top level (pretty much all
15221 of them, for a language without namespaces), can be processed
15223 if (parent_die == NULL
15224 && part_die->has_specification == 0
15225 && part_die->is_declaration == 0
15226 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
15227 || part_die->tag == DW_TAG_base_type
15228 || part_die->tag == DW_TAG_subrange_type))
15230 if (building_psymtab && part_die->name != NULL)
15231 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15232 VAR_DOMAIN, LOC_TYPEDEF,
15233 &objfile->static_psymbols,
15234 0, (CORE_ADDR) 0, cu->language, objfile);
15235 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15239 /* The exception for DW_TAG_typedef with has_children above is
15240 a workaround of GCC PR debug/47510. In the case of this complaint
15241 type_name_no_tag_or_error will error on such types later.
15243 GDB skipped children of DW_TAG_typedef by the shortcut above and then
15244 it could not find the child DIEs referenced later, this is checked
15245 above. In correct DWARF DW_TAG_typedef should have no children. */
15247 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
15248 complaint (&symfile_complaints,
15249 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
15250 "- DIE at 0x%x [in module %s]"),
15251 part_die->offset.sect_off, objfile_name (objfile));
15253 /* If we're at the second level, and we're an enumerator, and
15254 our parent has no specification (meaning possibly lives in a
15255 namespace elsewhere), then we can add the partial symbol now
15256 instead of queueing it. */
15257 if (part_die->tag == DW_TAG_enumerator
15258 && parent_die != NULL
15259 && parent_die->die_parent == NULL
15260 && parent_die->tag == DW_TAG_enumeration_type
15261 && parent_die->has_specification == 0)
15263 if (part_die->name == NULL)
15264 complaint (&symfile_complaints,
15265 _("malformed enumerator DIE ignored"));
15266 else if (building_psymtab)
15267 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15268 VAR_DOMAIN, LOC_CONST,
15269 (cu->language == language_cplus
15270 || cu->language == language_java)
15271 ? &objfile->global_psymbols
15272 : &objfile->static_psymbols,
15273 0, (CORE_ADDR) 0, cu->language, objfile);
15275 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15279 /* We'll save this DIE so link it in. */
15280 part_die->die_parent = parent_die;
15281 part_die->die_sibling = NULL;
15282 part_die->die_child = NULL;
15284 if (last_die && last_die == parent_die)
15285 last_die->die_child = part_die;
15287 last_die->die_sibling = part_die;
15289 last_die = part_die;
15291 if (first_die == NULL)
15292 first_die = part_die;
15294 /* Maybe add the DIE to the hash table. Not all DIEs that we
15295 find interesting need to be in the hash table, because we
15296 also have the parent/sibling/child chains; only those that we
15297 might refer to by offset later during partial symbol reading.
15299 For now this means things that might have be the target of a
15300 DW_AT_specification, DW_AT_abstract_origin, or
15301 DW_AT_extension. DW_AT_extension will refer only to
15302 namespaces; DW_AT_abstract_origin refers to functions (and
15303 many things under the function DIE, but we do not recurse
15304 into function DIEs during partial symbol reading) and
15305 possibly variables as well; DW_AT_specification refers to
15306 declarations. Declarations ought to have the DW_AT_declaration
15307 flag. It happens that GCC forgets to put it in sometimes, but
15308 only for functions, not for types.
15310 Adding more things than necessary to the hash table is harmless
15311 except for the performance cost. Adding too few will result in
15312 wasted time in find_partial_die, when we reread the compilation
15313 unit with load_all_dies set. */
15316 || abbrev->tag == DW_TAG_constant
15317 || abbrev->tag == DW_TAG_subprogram
15318 || abbrev->tag == DW_TAG_variable
15319 || abbrev->tag == DW_TAG_namespace
15320 || part_die->is_declaration)
15324 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
15325 part_die->offset.sect_off, INSERT);
15329 part_die = obstack_alloc (&cu->comp_unit_obstack,
15330 sizeof (struct partial_die_info));
15332 /* For some DIEs we want to follow their children (if any). For C
15333 we have no reason to follow the children of structures; for other
15334 languages we have to, so that we can get at method physnames
15335 to infer fully qualified class names, for DW_AT_specification,
15336 and for C++ template arguments. For C++, we also look one level
15337 inside functions to find template arguments (if the name of the
15338 function does not already contain the template arguments).
15340 For Ada, we need to scan the children of subprograms and lexical
15341 blocks as well because Ada allows the definition of nested
15342 entities that could be interesting for the debugger, such as
15343 nested subprograms for instance. */
15344 if (last_die->has_children
15346 || last_die->tag == DW_TAG_namespace
15347 || last_die->tag == DW_TAG_module
15348 || last_die->tag == DW_TAG_enumeration_type
15349 || (cu->language == language_cplus
15350 && last_die->tag == DW_TAG_subprogram
15351 && (last_die->name == NULL
15352 || strchr (last_die->name, '<') == NULL))
15353 || (cu->language != language_c
15354 && (last_die->tag == DW_TAG_class_type
15355 || last_die->tag == DW_TAG_interface_type
15356 || last_die->tag == DW_TAG_structure_type
15357 || last_die->tag == DW_TAG_union_type))
15358 || (cu->language == language_ada
15359 && (last_die->tag == DW_TAG_subprogram
15360 || last_die->tag == DW_TAG_lexical_block))))
15363 parent_die = last_die;
15367 /* Otherwise we skip to the next sibling, if any. */
15368 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
15370 /* Back to the top, do it again. */
15374 /* Read a minimal amount of information into the minimal die structure. */
15376 static const gdb_byte *
15377 read_partial_die (const struct die_reader_specs *reader,
15378 struct partial_die_info *part_die,
15379 struct abbrev_info *abbrev, unsigned int abbrev_len,
15380 const gdb_byte *info_ptr)
15382 struct dwarf2_cu *cu = reader->cu;
15383 struct objfile *objfile = cu->objfile;
15384 const gdb_byte *buffer = reader->buffer;
15386 struct attribute attr;
15387 int has_low_pc_attr = 0;
15388 int has_high_pc_attr = 0;
15389 int high_pc_relative = 0;
15391 memset (part_die, 0, sizeof (struct partial_die_info));
15393 part_die->offset.sect_off = info_ptr - buffer;
15395 info_ptr += abbrev_len;
15397 if (abbrev == NULL)
15400 part_die->tag = abbrev->tag;
15401 part_die->has_children = abbrev->has_children;
15403 for (i = 0; i < abbrev->num_attrs; ++i)
15405 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
15407 /* Store the data if it is of an attribute we want to keep in a
15408 partial symbol table. */
15412 switch (part_die->tag)
15414 case DW_TAG_compile_unit:
15415 case DW_TAG_partial_unit:
15416 case DW_TAG_type_unit:
15417 /* Compilation units have a DW_AT_name that is a filename, not
15418 a source language identifier. */
15419 case DW_TAG_enumeration_type:
15420 case DW_TAG_enumerator:
15421 /* These tags always have simple identifiers already; no need
15422 to canonicalize them. */
15423 part_die->name = DW_STRING (&attr);
15427 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
15428 &objfile->objfile_obstack);
15432 case DW_AT_linkage_name:
15433 case DW_AT_MIPS_linkage_name:
15434 /* Note that both forms of linkage name might appear. We
15435 assume they will be the same, and we only store the last
15437 if (cu->language == language_ada)
15438 part_die->name = DW_STRING (&attr);
15439 part_die->linkage_name = DW_STRING (&attr);
15442 has_low_pc_attr = 1;
15443 part_die->lowpc = attr_value_as_address (&attr);
15445 case DW_AT_high_pc:
15446 has_high_pc_attr = 1;
15447 part_die->highpc = attr_value_as_address (&attr);
15448 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
15449 high_pc_relative = 1;
15451 case DW_AT_location:
15452 /* Support the .debug_loc offsets. */
15453 if (attr_form_is_block (&attr))
15455 part_die->d.locdesc = DW_BLOCK (&attr);
15457 else if (attr_form_is_section_offset (&attr))
15459 dwarf2_complex_location_expr_complaint ();
15463 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15464 "partial symbol information");
15467 case DW_AT_external:
15468 part_die->is_external = DW_UNSND (&attr);
15470 case DW_AT_declaration:
15471 part_die->is_declaration = DW_UNSND (&attr);
15474 part_die->has_type = 1;
15476 case DW_AT_abstract_origin:
15477 case DW_AT_specification:
15478 case DW_AT_extension:
15479 part_die->has_specification = 1;
15480 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
15481 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15482 || cu->per_cu->is_dwz);
15484 case DW_AT_sibling:
15485 /* Ignore absolute siblings, they might point outside of
15486 the current compile unit. */
15487 if (attr.form == DW_FORM_ref_addr)
15488 complaint (&symfile_complaints,
15489 _("ignoring absolute DW_AT_sibling"));
15492 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
15493 const gdb_byte *sibling_ptr = buffer + off;
15495 if (sibling_ptr < info_ptr)
15496 complaint (&symfile_complaints,
15497 _("DW_AT_sibling points backwards"));
15498 else if (sibling_ptr > reader->buffer_end)
15499 dwarf2_section_buffer_overflow_complaint (reader->die_section);
15501 part_die->sibling = sibling_ptr;
15504 case DW_AT_byte_size:
15505 part_die->has_byte_size = 1;
15507 case DW_AT_calling_convention:
15508 /* DWARF doesn't provide a way to identify a program's source-level
15509 entry point. DW_AT_calling_convention attributes are only meant
15510 to describe functions' calling conventions.
15512 However, because it's a necessary piece of information in
15513 Fortran, and because DW_CC_program is the only piece of debugging
15514 information whose definition refers to a 'main program' at all,
15515 several compilers have begun marking Fortran main programs with
15516 DW_CC_program --- even when those functions use the standard
15517 calling conventions.
15519 So until DWARF specifies a way to provide this information and
15520 compilers pick up the new representation, we'll support this
15522 if (DW_UNSND (&attr) == DW_CC_program
15523 && cu->language == language_fortran)
15524 set_objfile_main_name (objfile, part_die->name, language_fortran);
15527 if (DW_UNSND (&attr) == DW_INL_inlined
15528 || DW_UNSND (&attr) == DW_INL_declared_inlined)
15529 part_die->may_be_inlined = 1;
15533 if (part_die->tag == DW_TAG_imported_unit)
15535 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
15536 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15537 || cu->per_cu->is_dwz);
15546 if (high_pc_relative)
15547 part_die->highpc += part_die->lowpc;
15549 if (has_low_pc_attr && has_high_pc_attr)
15551 /* When using the GNU linker, .gnu.linkonce. sections are used to
15552 eliminate duplicate copies of functions and vtables and such.
15553 The linker will arbitrarily choose one and discard the others.
15554 The AT_*_pc values for such functions refer to local labels in
15555 these sections. If the section from that file was discarded, the
15556 labels are not in the output, so the relocs get a value of 0.
15557 If this is a discarded function, mark the pc bounds as invalid,
15558 so that GDB will ignore it. */
15559 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
15561 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15563 complaint (&symfile_complaints,
15564 _("DW_AT_low_pc %s is zero "
15565 "for DIE at 0x%x [in module %s]"),
15566 paddress (gdbarch, part_die->lowpc),
15567 part_die->offset.sect_off, objfile_name (objfile));
15569 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
15570 else if (part_die->lowpc >= part_die->highpc)
15572 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15574 complaint (&symfile_complaints,
15575 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
15576 "for DIE at 0x%x [in module %s]"),
15577 paddress (gdbarch, part_die->lowpc),
15578 paddress (gdbarch, part_die->highpc),
15579 part_die->offset.sect_off, objfile_name (objfile));
15582 part_die->has_pc_info = 1;
15588 /* Find a cached partial DIE at OFFSET in CU. */
15590 static struct partial_die_info *
15591 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
15593 struct partial_die_info *lookup_die = NULL;
15594 struct partial_die_info part_die;
15596 part_die.offset = offset;
15597 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
15603 /* Find a partial DIE at OFFSET, which may or may not be in CU,
15604 except in the case of .debug_types DIEs which do not reference
15605 outside their CU (they do however referencing other types via
15606 DW_FORM_ref_sig8). */
15608 static struct partial_die_info *
15609 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
15611 struct objfile *objfile = cu->objfile;
15612 struct dwarf2_per_cu_data *per_cu = NULL;
15613 struct partial_die_info *pd = NULL;
15615 if (offset_in_dwz == cu->per_cu->is_dwz
15616 && offset_in_cu_p (&cu->header, offset))
15618 pd = find_partial_die_in_comp_unit (offset, cu);
15621 /* We missed recording what we needed.
15622 Load all dies and try again. */
15623 per_cu = cu->per_cu;
15627 /* TUs don't reference other CUs/TUs (except via type signatures). */
15628 if (cu->per_cu->is_debug_types)
15630 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
15631 " external reference to offset 0x%lx [in module %s].\n"),
15632 (long) cu->header.offset.sect_off, (long) offset.sect_off,
15633 bfd_get_filename (objfile->obfd));
15635 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
15638 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
15639 load_partial_comp_unit (per_cu);
15641 per_cu->cu->last_used = 0;
15642 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15645 /* If we didn't find it, and not all dies have been loaded,
15646 load them all and try again. */
15648 if (pd == NULL && per_cu->load_all_dies == 0)
15650 per_cu->load_all_dies = 1;
15652 /* This is nasty. When we reread the DIEs, somewhere up the call chain
15653 THIS_CU->cu may already be in use. So we can't just free it and
15654 replace its DIEs with the ones we read in. Instead, we leave those
15655 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
15656 and clobber THIS_CU->cu->partial_dies with the hash table for the new
15658 load_partial_comp_unit (per_cu);
15660 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15664 internal_error (__FILE__, __LINE__,
15665 _("could not find partial DIE 0x%x "
15666 "in cache [from module %s]\n"),
15667 offset.sect_off, bfd_get_filename (objfile->obfd));
15671 /* See if we can figure out if the class lives in a namespace. We do
15672 this by looking for a member function; its demangled name will
15673 contain namespace info, if there is any. */
15676 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
15677 struct dwarf2_cu *cu)
15679 /* NOTE: carlton/2003-10-07: Getting the info this way changes
15680 what template types look like, because the demangler
15681 frequently doesn't give the same name as the debug info. We
15682 could fix this by only using the demangled name to get the
15683 prefix (but see comment in read_structure_type). */
15685 struct partial_die_info *real_pdi;
15686 struct partial_die_info *child_pdi;
15688 /* If this DIE (this DIE's specification, if any) has a parent, then
15689 we should not do this. We'll prepend the parent's fully qualified
15690 name when we create the partial symbol. */
15692 real_pdi = struct_pdi;
15693 while (real_pdi->has_specification)
15694 real_pdi = find_partial_die (real_pdi->spec_offset,
15695 real_pdi->spec_is_dwz, cu);
15697 if (real_pdi->die_parent != NULL)
15700 for (child_pdi = struct_pdi->die_child;
15702 child_pdi = child_pdi->die_sibling)
15704 if (child_pdi->tag == DW_TAG_subprogram
15705 && child_pdi->linkage_name != NULL)
15707 char *actual_class_name
15708 = language_class_name_from_physname (cu->language_defn,
15709 child_pdi->linkage_name);
15710 if (actual_class_name != NULL)
15713 = obstack_copy0 (&cu->objfile->objfile_obstack,
15715 strlen (actual_class_name));
15716 xfree (actual_class_name);
15723 /* Adjust PART_DIE before generating a symbol for it. This function
15724 may set the is_external flag or change the DIE's name. */
15727 fixup_partial_die (struct partial_die_info *part_die,
15728 struct dwarf2_cu *cu)
15730 /* Once we've fixed up a die, there's no point in doing so again.
15731 This also avoids a memory leak if we were to call
15732 guess_partial_die_structure_name multiple times. */
15733 if (part_die->fixup_called)
15736 /* If we found a reference attribute and the DIE has no name, try
15737 to find a name in the referred to DIE. */
15739 if (part_die->name == NULL && part_die->has_specification)
15741 struct partial_die_info *spec_die;
15743 spec_die = find_partial_die (part_die->spec_offset,
15744 part_die->spec_is_dwz, cu);
15746 fixup_partial_die (spec_die, cu);
15748 if (spec_die->name)
15750 part_die->name = spec_die->name;
15752 /* Copy DW_AT_external attribute if it is set. */
15753 if (spec_die->is_external)
15754 part_die->is_external = spec_die->is_external;
15758 /* Set default names for some unnamed DIEs. */
15760 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
15761 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
15763 /* If there is no parent die to provide a namespace, and there are
15764 children, see if we can determine the namespace from their linkage
15766 if (cu->language == language_cplus
15767 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
15768 && part_die->die_parent == NULL
15769 && part_die->has_children
15770 && (part_die->tag == DW_TAG_class_type
15771 || part_die->tag == DW_TAG_structure_type
15772 || part_die->tag == DW_TAG_union_type))
15773 guess_partial_die_structure_name (part_die, cu);
15775 /* GCC might emit a nameless struct or union that has a linkage
15776 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
15777 if (part_die->name == NULL
15778 && (part_die->tag == DW_TAG_class_type
15779 || part_die->tag == DW_TAG_interface_type
15780 || part_die->tag == DW_TAG_structure_type
15781 || part_die->tag == DW_TAG_union_type)
15782 && part_die->linkage_name != NULL)
15786 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
15791 /* Strip any leading namespaces/classes, keep only the base name.
15792 DW_AT_name for named DIEs does not contain the prefixes. */
15793 base = strrchr (demangled, ':');
15794 if (base && base > demangled && base[-1] == ':')
15799 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
15800 base, strlen (base));
15805 part_die->fixup_called = 1;
15808 /* Read an attribute value described by an attribute form. */
15810 static const gdb_byte *
15811 read_attribute_value (const struct die_reader_specs *reader,
15812 struct attribute *attr, unsigned form,
15813 const gdb_byte *info_ptr)
15815 struct dwarf2_cu *cu = reader->cu;
15816 bfd *abfd = reader->abfd;
15817 struct comp_unit_head *cu_header = &cu->header;
15818 unsigned int bytes_read;
15819 struct dwarf_block *blk;
15824 case DW_FORM_ref_addr:
15825 if (cu->header.version == 2)
15826 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15828 DW_UNSND (attr) = read_offset (abfd, info_ptr,
15829 &cu->header, &bytes_read);
15830 info_ptr += bytes_read;
15832 case DW_FORM_GNU_ref_alt:
15833 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15834 info_ptr += bytes_read;
15837 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15838 info_ptr += bytes_read;
15840 case DW_FORM_block2:
15841 blk = dwarf_alloc_block (cu);
15842 blk->size = read_2_bytes (abfd, info_ptr);
15844 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15845 info_ptr += blk->size;
15846 DW_BLOCK (attr) = blk;
15848 case DW_FORM_block4:
15849 blk = dwarf_alloc_block (cu);
15850 blk->size = read_4_bytes (abfd, info_ptr);
15852 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15853 info_ptr += blk->size;
15854 DW_BLOCK (attr) = blk;
15856 case DW_FORM_data2:
15857 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
15860 case DW_FORM_data4:
15861 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
15864 case DW_FORM_data8:
15865 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
15868 case DW_FORM_sec_offset:
15869 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15870 info_ptr += bytes_read;
15872 case DW_FORM_string:
15873 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
15874 DW_STRING_IS_CANONICAL (attr) = 0;
15875 info_ptr += bytes_read;
15878 if (!cu->per_cu->is_dwz)
15880 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
15882 DW_STRING_IS_CANONICAL (attr) = 0;
15883 info_ptr += bytes_read;
15887 case DW_FORM_GNU_strp_alt:
15889 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15890 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
15893 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
15894 DW_STRING_IS_CANONICAL (attr) = 0;
15895 info_ptr += bytes_read;
15898 case DW_FORM_exprloc:
15899 case DW_FORM_block:
15900 blk = dwarf_alloc_block (cu);
15901 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15902 info_ptr += bytes_read;
15903 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15904 info_ptr += blk->size;
15905 DW_BLOCK (attr) = blk;
15907 case DW_FORM_block1:
15908 blk = dwarf_alloc_block (cu);
15909 blk->size = read_1_byte (abfd, info_ptr);
15911 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15912 info_ptr += blk->size;
15913 DW_BLOCK (attr) = blk;
15915 case DW_FORM_data1:
15916 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15920 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15923 case DW_FORM_flag_present:
15924 DW_UNSND (attr) = 1;
15926 case DW_FORM_sdata:
15927 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
15928 info_ptr += bytes_read;
15930 case DW_FORM_udata:
15931 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15932 info_ptr += bytes_read;
15935 DW_UNSND (attr) = (cu->header.offset.sect_off
15936 + read_1_byte (abfd, info_ptr));
15940 DW_UNSND (attr) = (cu->header.offset.sect_off
15941 + read_2_bytes (abfd, info_ptr));
15945 DW_UNSND (attr) = (cu->header.offset.sect_off
15946 + read_4_bytes (abfd, info_ptr));
15950 DW_UNSND (attr) = (cu->header.offset.sect_off
15951 + read_8_bytes (abfd, info_ptr));
15954 case DW_FORM_ref_sig8:
15955 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
15958 case DW_FORM_ref_udata:
15959 DW_UNSND (attr) = (cu->header.offset.sect_off
15960 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
15961 info_ptr += bytes_read;
15963 case DW_FORM_indirect:
15964 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15965 info_ptr += bytes_read;
15966 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
15968 case DW_FORM_GNU_addr_index:
15969 if (reader->dwo_file == NULL)
15971 /* For now flag a hard error.
15972 Later we can turn this into a complaint. */
15973 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15974 dwarf_form_name (form),
15975 bfd_get_filename (abfd));
15977 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
15978 info_ptr += bytes_read;
15980 case DW_FORM_GNU_str_index:
15981 if (reader->dwo_file == NULL)
15983 /* For now flag a hard error.
15984 Later we can turn this into a complaint if warranted. */
15985 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15986 dwarf_form_name (form),
15987 bfd_get_filename (abfd));
15990 ULONGEST str_index =
15991 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15993 DW_STRING (attr) = read_str_index (reader, str_index);
15994 DW_STRING_IS_CANONICAL (attr) = 0;
15995 info_ptr += bytes_read;
15999 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16000 dwarf_form_name (form),
16001 bfd_get_filename (abfd));
16005 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16006 attr->form = DW_FORM_GNU_ref_alt;
16008 /* We have seen instances where the compiler tried to emit a byte
16009 size attribute of -1 which ended up being encoded as an unsigned
16010 0xffffffff. Although 0xffffffff is technically a valid size value,
16011 an object of this size seems pretty unlikely so we can relatively
16012 safely treat these cases as if the size attribute was invalid and
16013 treat them as zero by default. */
16014 if (attr->name == DW_AT_byte_size
16015 && form == DW_FORM_data4
16016 && DW_UNSND (attr) >= 0xffffffff)
16019 (&symfile_complaints,
16020 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16021 hex_string (DW_UNSND (attr)));
16022 DW_UNSND (attr) = 0;
16028 /* Read an attribute described by an abbreviated attribute. */
16030 static const gdb_byte *
16031 read_attribute (const struct die_reader_specs *reader,
16032 struct attribute *attr, struct attr_abbrev *abbrev,
16033 const gdb_byte *info_ptr)
16035 attr->name = abbrev->name;
16036 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
16039 /* Read dwarf information from a buffer. */
16041 static unsigned int
16042 read_1_byte (bfd *abfd, const gdb_byte *buf)
16044 return bfd_get_8 (abfd, buf);
16048 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
16050 return bfd_get_signed_8 (abfd, buf);
16053 static unsigned int
16054 read_2_bytes (bfd *abfd, const gdb_byte *buf)
16056 return bfd_get_16 (abfd, buf);
16060 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16062 return bfd_get_signed_16 (abfd, buf);
16065 static unsigned int
16066 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16068 return bfd_get_32 (abfd, buf);
16072 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16074 return bfd_get_signed_32 (abfd, buf);
16078 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16080 return bfd_get_64 (abfd, buf);
16084 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16085 unsigned int *bytes_read)
16087 struct comp_unit_head *cu_header = &cu->header;
16088 CORE_ADDR retval = 0;
16090 if (cu_header->signed_addr_p)
16092 switch (cu_header->addr_size)
16095 retval = bfd_get_signed_16 (abfd, buf);
16098 retval = bfd_get_signed_32 (abfd, buf);
16101 retval = bfd_get_signed_64 (abfd, buf);
16104 internal_error (__FILE__, __LINE__,
16105 _("read_address: bad switch, signed [in module %s]"),
16106 bfd_get_filename (abfd));
16111 switch (cu_header->addr_size)
16114 retval = bfd_get_16 (abfd, buf);
16117 retval = bfd_get_32 (abfd, buf);
16120 retval = bfd_get_64 (abfd, buf);
16123 internal_error (__FILE__, __LINE__,
16124 _("read_address: bad switch, "
16125 "unsigned [in module %s]"),
16126 bfd_get_filename (abfd));
16130 *bytes_read = cu_header->addr_size;
16134 /* Read the initial length from a section. The (draft) DWARF 3
16135 specification allows the initial length to take up either 4 bytes
16136 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
16137 bytes describe the length and all offsets will be 8 bytes in length
16140 An older, non-standard 64-bit format is also handled by this
16141 function. The older format in question stores the initial length
16142 as an 8-byte quantity without an escape value. Lengths greater
16143 than 2^32 aren't very common which means that the initial 4 bytes
16144 is almost always zero. Since a length value of zero doesn't make
16145 sense for the 32-bit format, this initial zero can be considered to
16146 be an escape value which indicates the presence of the older 64-bit
16147 format. As written, the code can't detect (old format) lengths
16148 greater than 4GB. If it becomes necessary to handle lengths
16149 somewhat larger than 4GB, we could allow other small values (such
16150 as the non-sensical values of 1, 2, and 3) to also be used as
16151 escape values indicating the presence of the old format.
16153 The value returned via bytes_read should be used to increment the
16154 relevant pointer after calling read_initial_length().
16156 [ Note: read_initial_length() and read_offset() are based on the
16157 document entitled "DWARF Debugging Information Format", revision
16158 3, draft 8, dated November 19, 2001. This document was obtained
16161 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
16163 This document is only a draft and is subject to change. (So beware.)
16165 Details regarding the older, non-standard 64-bit format were
16166 determined empirically by examining 64-bit ELF files produced by
16167 the SGI toolchain on an IRIX 6.5 machine.
16169 - Kevin, July 16, 2002
16173 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
16175 LONGEST length = bfd_get_32 (abfd, buf);
16177 if (length == 0xffffffff)
16179 length = bfd_get_64 (abfd, buf + 4);
16182 else if (length == 0)
16184 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
16185 length = bfd_get_64 (abfd, buf);
16196 /* Cover function for read_initial_length.
16197 Returns the length of the object at BUF, and stores the size of the
16198 initial length in *BYTES_READ and stores the size that offsets will be in
16200 If the initial length size is not equivalent to that specified in
16201 CU_HEADER then issue a complaint.
16202 This is useful when reading non-comp-unit headers. */
16205 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
16206 const struct comp_unit_head *cu_header,
16207 unsigned int *bytes_read,
16208 unsigned int *offset_size)
16210 LONGEST length = read_initial_length (abfd, buf, bytes_read);
16212 gdb_assert (cu_header->initial_length_size == 4
16213 || cu_header->initial_length_size == 8
16214 || cu_header->initial_length_size == 12);
16216 if (cu_header->initial_length_size != *bytes_read)
16217 complaint (&symfile_complaints,
16218 _("intermixed 32-bit and 64-bit DWARF sections"));
16220 *offset_size = (*bytes_read == 4) ? 4 : 8;
16224 /* Read an offset from the data stream. The size of the offset is
16225 given by cu_header->offset_size. */
16228 read_offset (bfd *abfd, const gdb_byte *buf,
16229 const struct comp_unit_head *cu_header,
16230 unsigned int *bytes_read)
16232 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
16234 *bytes_read = cu_header->offset_size;
16238 /* Read an offset from the data stream. */
16241 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
16243 LONGEST retval = 0;
16245 switch (offset_size)
16248 retval = bfd_get_32 (abfd, buf);
16251 retval = bfd_get_64 (abfd, buf);
16254 internal_error (__FILE__, __LINE__,
16255 _("read_offset_1: bad switch [in module %s]"),
16256 bfd_get_filename (abfd));
16262 static const gdb_byte *
16263 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
16265 /* If the size of a host char is 8 bits, we can return a pointer
16266 to the buffer, otherwise we have to copy the data to a buffer
16267 allocated on the temporary obstack. */
16268 gdb_assert (HOST_CHAR_BIT == 8);
16272 static const char *
16273 read_direct_string (bfd *abfd, const gdb_byte *buf,
16274 unsigned int *bytes_read_ptr)
16276 /* If the size of a host char is 8 bits, we can return a pointer
16277 to the string, otherwise we have to copy the string to a buffer
16278 allocated on the temporary obstack. */
16279 gdb_assert (HOST_CHAR_BIT == 8);
16282 *bytes_read_ptr = 1;
16285 *bytes_read_ptr = strlen ((const char *) buf) + 1;
16286 return (const char *) buf;
16289 static const char *
16290 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
16292 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
16293 if (dwarf2_per_objfile->str.buffer == NULL)
16294 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
16295 bfd_get_filename (abfd));
16296 if (str_offset >= dwarf2_per_objfile->str.size)
16297 error (_("DW_FORM_strp pointing outside of "
16298 ".debug_str section [in module %s]"),
16299 bfd_get_filename (abfd));
16300 gdb_assert (HOST_CHAR_BIT == 8);
16301 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
16303 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
16306 /* Read a string at offset STR_OFFSET in the .debug_str section from
16307 the .dwz file DWZ. Throw an error if the offset is too large. If
16308 the string consists of a single NUL byte, return NULL; otherwise
16309 return a pointer to the string. */
16311 static const char *
16312 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
16314 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
16316 if (dwz->str.buffer == NULL)
16317 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
16318 "section [in module %s]"),
16319 bfd_get_filename (dwz->dwz_bfd));
16320 if (str_offset >= dwz->str.size)
16321 error (_("DW_FORM_GNU_strp_alt pointing outside of "
16322 ".debug_str section [in module %s]"),
16323 bfd_get_filename (dwz->dwz_bfd));
16324 gdb_assert (HOST_CHAR_BIT == 8);
16325 if (dwz->str.buffer[str_offset] == '\0')
16327 return (const char *) (dwz->str.buffer + str_offset);
16330 static const char *
16331 read_indirect_string (bfd *abfd, const gdb_byte *buf,
16332 const struct comp_unit_head *cu_header,
16333 unsigned int *bytes_read_ptr)
16335 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
16337 return read_indirect_string_at_offset (abfd, str_offset);
16341 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
16342 unsigned int *bytes_read_ptr)
16345 unsigned int num_read;
16347 unsigned char byte;
16355 byte = bfd_get_8 (abfd, buf);
16358 result |= ((ULONGEST) (byte & 127) << shift);
16359 if ((byte & 128) == 0)
16365 *bytes_read_ptr = num_read;
16370 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
16371 unsigned int *bytes_read_ptr)
16374 int i, shift, num_read;
16375 unsigned char byte;
16383 byte = bfd_get_8 (abfd, buf);
16386 result |= ((LONGEST) (byte & 127) << shift);
16388 if ((byte & 128) == 0)
16393 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
16394 result |= -(((LONGEST) 1) << shift);
16395 *bytes_read_ptr = num_read;
16399 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
16400 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
16401 ADDR_SIZE is the size of addresses from the CU header. */
16404 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
16406 struct objfile *objfile = dwarf2_per_objfile->objfile;
16407 bfd *abfd = objfile->obfd;
16408 const gdb_byte *info_ptr;
16410 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
16411 if (dwarf2_per_objfile->addr.buffer == NULL)
16412 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
16413 objfile_name (objfile));
16414 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
16415 error (_("DW_FORM_addr_index pointing outside of "
16416 ".debug_addr section [in module %s]"),
16417 objfile_name (objfile));
16418 info_ptr = (dwarf2_per_objfile->addr.buffer
16419 + addr_base + addr_index * addr_size);
16420 if (addr_size == 4)
16421 return bfd_get_32 (abfd, info_ptr);
16423 return bfd_get_64 (abfd, info_ptr);
16426 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
16429 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
16431 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
16434 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
16437 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
16438 unsigned int *bytes_read)
16440 bfd *abfd = cu->objfile->obfd;
16441 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
16443 return read_addr_index (cu, addr_index);
16446 /* Data structure to pass results from dwarf2_read_addr_index_reader
16447 back to dwarf2_read_addr_index. */
16449 struct dwarf2_read_addr_index_data
16451 ULONGEST addr_base;
16455 /* die_reader_func for dwarf2_read_addr_index. */
16458 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
16459 const gdb_byte *info_ptr,
16460 struct die_info *comp_unit_die,
16464 struct dwarf2_cu *cu = reader->cu;
16465 struct dwarf2_read_addr_index_data *aidata =
16466 (struct dwarf2_read_addr_index_data *) data;
16468 aidata->addr_base = cu->addr_base;
16469 aidata->addr_size = cu->header.addr_size;
16472 /* Given an index in .debug_addr, fetch the value.
16473 NOTE: This can be called during dwarf expression evaluation,
16474 long after the debug information has been read, and thus per_cu->cu
16475 may no longer exist. */
16478 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
16479 unsigned int addr_index)
16481 struct objfile *objfile = per_cu->objfile;
16482 struct dwarf2_cu *cu = per_cu->cu;
16483 ULONGEST addr_base;
16486 /* This is intended to be called from outside this file. */
16487 dw2_setup (objfile);
16489 /* We need addr_base and addr_size.
16490 If we don't have PER_CU->cu, we have to get it.
16491 Nasty, but the alternative is storing the needed info in PER_CU,
16492 which at this point doesn't seem justified: it's not clear how frequently
16493 it would get used and it would increase the size of every PER_CU.
16494 Entry points like dwarf2_per_cu_addr_size do a similar thing
16495 so we're not in uncharted territory here.
16496 Alas we need to be a bit more complicated as addr_base is contained
16499 We don't need to read the entire CU(/TU).
16500 We just need the header and top level die.
16502 IWBN to use the aging mechanism to let us lazily later discard the CU.
16503 For now we skip this optimization. */
16507 addr_base = cu->addr_base;
16508 addr_size = cu->header.addr_size;
16512 struct dwarf2_read_addr_index_data aidata;
16514 /* Note: We can't use init_cutu_and_read_dies_simple here,
16515 we need addr_base. */
16516 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
16517 dwarf2_read_addr_index_reader, &aidata);
16518 addr_base = aidata.addr_base;
16519 addr_size = aidata.addr_size;
16522 return read_addr_index_1 (addr_index, addr_base, addr_size);
16525 /* Given a DW_FORM_GNU_str_index, fetch the string.
16526 This is only used by the Fission support. */
16528 static const char *
16529 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
16531 struct objfile *objfile = dwarf2_per_objfile->objfile;
16532 const char *objf_name = objfile_name (objfile);
16533 bfd *abfd = objfile->obfd;
16534 struct dwarf2_cu *cu = reader->cu;
16535 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
16536 struct dwarf2_section_info *str_offsets_section =
16537 &reader->dwo_file->sections.str_offsets;
16538 const gdb_byte *info_ptr;
16539 ULONGEST str_offset;
16540 static const char form_name[] = "DW_FORM_GNU_str_index";
16542 dwarf2_read_section (objfile, str_section);
16543 dwarf2_read_section (objfile, str_offsets_section);
16544 if (str_section->buffer == NULL)
16545 error (_("%s used without .debug_str.dwo section"
16546 " in CU at offset 0x%lx [in module %s]"),
16547 form_name, (long) cu->header.offset.sect_off, objf_name);
16548 if (str_offsets_section->buffer == NULL)
16549 error (_("%s used without .debug_str_offsets.dwo section"
16550 " in CU at offset 0x%lx [in module %s]"),
16551 form_name, (long) cu->header.offset.sect_off, objf_name);
16552 if (str_index * cu->header.offset_size >= str_offsets_section->size)
16553 error (_("%s pointing outside of .debug_str_offsets.dwo"
16554 " section in CU at offset 0x%lx [in module %s]"),
16555 form_name, (long) cu->header.offset.sect_off, objf_name);
16556 info_ptr = (str_offsets_section->buffer
16557 + str_index * cu->header.offset_size);
16558 if (cu->header.offset_size == 4)
16559 str_offset = bfd_get_32 (abfd, info_ptr);
16561 str_offset = bfd_get_64 (abfd, info_ptr);
16562 if (str_offset >= str_section->size)
16563 error (_("Offset from %s pointing outside of"
16564 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
16565 form_name, (long) cu->header.offset.sect_off, objf_name);
16566 return (const char *) (str_section->buffer + str_offset);
16569 /* Return the length of an LEB128 number in BUF. */
16572 leb128_size (const gdb_byte *buf)
16574 const gdb_byte *begin = buf;
16580 if ((byte & 128) == 0)
16581 return buf - begin;
16586 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
16594 cu->language = language_c;
16596 case DW_LANG_C_plus_plus:
16597 cu->language = language_cplus;
16600 cu->language = language_d;
16602 case DW_LANG_Fortran77:
16603 case DW_LANG_Fortran90:
16604 case DW_LANG_Fortran95:
16605 cu->language = language_fortran;
16608 cu->language = language_go;
16610 case DW_LANG_Mips_Assembler:
16611 cu->language = language_asm;
16614 cu->language = language_java;
16616 case DW_LANG_Ada83:
16617 case DW_LANG_Ada95:
16618 cu->language = language_ada;
16620 case DW_LANG_Modula2:
16621 cu->language = language_m2;
16623 case DW_LANG_Pascal83:
16624 cu->language = language_pascal;
16627 cu->language = language_objc;
16629 case DW_LANG_Cobol74:
16630 case DW_LANG_Cobol85:
16632 cu->language = language_minimal;
16635 cu->language_defn = language_def (cu->language);
16638 /* Return the named attribute or NULL if not there. */
16640 static struct attribute *
16641 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
16646 struct attribute *spec = NULL;
16648 for (i = 0; i < die->num_attrs; ++i)
16650 if (die->attrs[i].name == name)
16651 return &die->attrs[i];
16652 if (die->attrs[i].name == DW_AT_specification
16653 || die->attrs[i].name == DW_AT_abstract_origin)
16654 spec = &die->attrs[i];
16660 die = follow_die_ref (die, spec, &cu);
16666 /* Return the named attribute or NULL if not there,
16667 but do not follow DW_AT_specification, etc.
16668 This is for use in contexts where we're reading .debug_types dies.
16669 Following DW_AT_specification, DW_AT_abstract_origin will take us
16670 back up the chain, and we want to go down. */
16672 static struct attribute *
16673 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
16677 for (i = 0; i < die->num_attrs; ++i)
16678 if (die->attrs[i].name == name)
16679 return &die->attrs[i];
16684 /* Return non-zero iff the attribute NAME is defined for the given DIE,
16685 and holds a non-zero value. This function should only be used for
16686 DW_FORM_flag or DW_FORM_flag_present attributes. */
16689 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
16691 struct attribute *attr = dwarf2_attr (die, name, cu);
16693 return (attr && DW_UNSND (attr));
16697 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
16699 /* A DIE is a declaration if it has a DW_AT_declaration attribute
16700 which value is non-zero. However, we have to be careful with
16701 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
16702 (via dwarf2_flag_true_p) follows this attribute. So we may
16703 end up accidently finding a declaration attribute that belongs
16704 to a different DIE referenced by the specification attribute,
16705 even though the given DIE does not have a declaration attribute. */
16706 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
16707 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
16710 /* Return the die giving the specification for DIE, if there is
16711 one. *SPEC_CU is the CU containing DIE on input, and the CU
16712 containing the return value on output. If there is no
16713 specification, but there is an abstract origin, that is
16716 static struct die_info *
16717 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
16719 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
16722 if (spec_attr == NULL)
16723 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
16725 if (spec_attr == NULL)
16728 return follow_die_ref (die, spec_attr, spec_cu);
16731 /* Free the line_header structure *LH, and any arrays and strings it
16733 NOTE: This is also used as a "cleanup" function. */
16736 free_line_header (struct line_header *lh)
16738 if (lh->standard_opcode_lengths)
16739 xfree (lh->standard_opcode_lengths);
16741 /* Remember that all the lh->file_names[i].name pointers are
16742 pointers into debug_line_buffer, and don't need to be freed. */
16743 if (lh->file_names)
16744 xfree (lh->file_names);
16746 /* Similarly for the include directory names. */
16747 if (lh->include_dirs)
16748 xfree (lh->include_dirs);
16753 /* Add an entry to LH's include directory table. */
16756 add_include_dir (struct line_header *lh, const char *include_dir)
16758 /* Grow the array if necessary. */
16759 if (lh->include_dirs_size == 0)
16761 lh->include_dirs_size = 1; /* for testing */
16762 lh->include_dirs = xmalloc (lh->include_dirs_size
16763 * sizeof (*lh->include_dirs));
16765 else if (lh->num_include_dirs >= lh->include_dirs_size)
16767 lh->include_dirs_size *= 2;
16768 lh->include_dirs = xrealloc (lh->include_dirs,
16769 (lh->include_dirs_size
16770 * sizeof (*lh->include_dirs)));
16773 lh->include_dirs[lh->num_include_dirs++] = include_dir;
16776 /* Add an entry to LH's file name table. */
16779 add_file_name (struct line_header *lh,
16781 unsigned int dir_index,
16782 unsigned int mod_time,
16783 unsigned int length)
16785 struct file_entry *fe;
16787 /* Grow the array if necessary. */
16788 if (lh->file_names_size == 0)
16790 lh->file_names_size = 1; /* for testing */
16791 lh->file_names = xmalloc (lh->file_names_size
16792 * sizeof (*lh->file_names));
16794 else if (lh->num_file_names >= lh->file_names_size)
16796 lh->file_names_size *= 2;
16797 lh->file_names = xrealloc (lh->file_names,
16798 (lh->file_names_size
16799 * sizeof (*lh->file_names)));
16802 fe = &lh->file_names[lh->num_file_names++];
16804 fe->dir_index = dir_index;
16805 fe->mod_time = mod_time;
16806 fe->length = length;
16807 fe->included_p = 0;
16811 /* A convenience function to find the proper .debug_line section for a
16814 static struct dwarf2_section_info *
16815 get_debug_line_section (struct dwarf2_cu *cu)
16817 struct dwarf2_section_info *section;
16819 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
16821 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16822 section = &cu->dwo_unit->dwo_file->sections.line;
16823 else if (cu->per_cu->is_dwz)
16825 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16827 section = &dwz->line;
16830 section = &dwarf2_per_objfile->line;
16835 /* Read the statement program header starting at OFFSET in
16836 .debug_line, or .debug_line.dwo. Return a pointer
16837 to a struct line_header, allocated using xmalloc.
16839 NOTE: the strings in the include directory and file name tables of
16840 the returned object point into the dwarf line section buffer,
16841 and must not be freed. */
16843 static struct line_header *
16844 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
16846 struct cleanup *back_to;
16847 struct line_header *lh;
16848 const gdb_byte *line_ptr;
16849 unsigned int bytes_read, offset_size;
16851 const char *cur_dir, *cur_file;
16852 struct dwarf2_section_info *section;
16855 section = get_debug_line_section (cu);
16856 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
16857 if (section->buffer == NULL)
16859 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16860 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
16862 complaint (&symfile_complaints, _("missing .debug_line section"));
16866 /* We can't do this until we know the section is non-empty.
16867 Only then do we know we have such a section. */
16868 abfd = get_section_bfd_owner (section);
16870 /* Make sure that at least there's room for the total_length field.
16871 That could be 12 bytes long, but we're just going to fudge that. */
16872 if (offset + 4 >= section->size)
16874 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16878 lh = xmalloc (sizeof (*lh));
16879 memset (lh, 0, sizeof (*lh));
16880 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
16883 line_ptr = section->buffer + offset;
16885 /* Read in the header. */
16887 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
16888 &bytes_read, &offset_size);
16889 line_ptr += bytes_read;
16890 if (line_ptr + lh->total_length > (section->buffer + section->size))
16892 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16893 do_cleanups (back_to);
16896 lh->statement_program_end = line_ptr + lh->total_length;
16897 lh->version = read_2_bytes (abfd, line_ptr);
16899 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
16900 line_ptr += offset_size;
16901 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
16903 if (lh->version >= 4)
16905 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
16909 lh->maximum_ops_per_instruction = 1;
16911 if (lh->maximum_ops_per_instruction == 0)
16913 lh->maximum_ops_per_instruction = 1;
16914 complaint (&symfile_complaints,
16915 _("invalid maximum_ops_per_instruction "
16916 "in `.debug_line' section"));
16919 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
16921 lh->line_base = read_1_signed_byte (abfd, line_ptr);
16923 lh->line_range = read_1_byte (abfd, line_ptr);
16925 lh->opcode_base = read_1_byte (abfd, line_ptr);
16927 lh->standard_opcode_lengths
16928 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
16930 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
16931 for (i = 1; i < lh->opcode_base; ++i)
16933 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
16937 /* Read directory table. */
16938 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16940 line_ptr += bytes_read;
16941 add_include_dir (lh, cur_dir);
16943 line_ptr += bytes_read;
16945 /* Read file name table. */
16946 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16948 unsigned int dir_index, mod_time, length;
16950 line_ptr += bytes_read;
16951 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16952 line_ptr += bytes_read;
16953 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16954 line_ptr += bytes_read;
16955 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16956 line_ptr += bytes_read;
16958 add_file_name (lh, cur_file, dir_index, mod_time, length);
16960 line_ptr += bytes_read;
16961 lh->statement_program_start = line_ptr;
16963 if (line_ptr > (section->buffer + section->size))
16964 complaint (&symfile_complaints,
16965 _("line number info header doesn't "
16966 "fit in `.debug_line' section"));
16968 discard_cleanups (back_to);
16972 /* Subroutine of dwarf_decode_lines to simplify it.
16973 Return the file name of the psymtab for included file FILE_INDEX
16974 in line header LH of PST.
16975 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16976 If space for the result is malloc'd, it will be freed by a cleanup.
16977 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
16979 The function creates dangling cleanup registration. */
16981 static const char *
16982 psymtab_include_file_name (const struct line_header *lh, int file_index,
16983 const struct partial_symtab *pst,
16984 const char *comp_dir)
16986 const struct file_entry fe = lh->file_names [file_index];
16987 const char *include_name = fe.name;
16988 const char *include_name_to_compare = include_name;
16989 const char *dir_name = NULL;
16990 const char *pst_filename;
16991 char *copied_name = NULL;
16995 dir_name = lh->include_dirs[fe.dir_index - 1];
16997 if (!IS_ABSOLUTE_PATH (include_name)
16998 && (dir_name != NULL || comp_dir != NULL))
17000 /* Avoid creating a duplicate psymtab for PST.
17001 We do this by comparing INCLUDE_NAME and PST_FILENAME.
17002 Before we do the comparison, however, we need to account
17003 for DIR_NAME and COMP_DIR.
17004 First prepend dir_name (if non-NULL). If we still don't
17005 have an absolute path prepend comp_dir (if non-NULL).
17006 However, the directory we record in the include-file's
17007 psymtab does not contain COMP_DIR (to match the
17008 corresponding symtab(s)).
17013 bash$ gcc -g ./hello.c
17014 include_name = "hello.c"
17016 DW_AT_comp_dir = comp_dir = "/tmp"
17017 DW_AT_name = "./hello.c" */
17019 if (dir_name != NULL)
17021 char *tem = concat (dir_name, SLASH_STRING,
17022 include_name, (char *)NULL);
17024 make_cleanup (xfree, tem);
17025 include_name = tem;
17026 include_name_to_compare = include_name;
17028 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
17030 char *tem = concat (comp_dir, SLASH_STRING,
17031 include_name, (char *)NULL);
17033 make_cleanup (xfree, tem);
17034 include_name_to_compare = tem;
17038 pst_filename = pst->filename;
17039 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
17041 copied_name = concat (pst->dirname, SLASH_STRING,
17042 pst_filename, (char *)NULL);
17043 pst_filename = copied_name;
17046 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
17048 if (copied_name != NULL)
17049 xfree (copied_name);
17053 return include_name;
17056 /* Ignore this record_line request. */
17059 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
17064 /* Subroutine of dwarf_decode_lines to simplify it.
17065 Process the line number information in LH. */
17068 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
17069 struct dwarf2_cu *cu, struct partial_symtab *pst)
17071 const gdb_byte *line_ptr, *extended_end;
17072 const gdb_byte *line_end;
17073 unsigned int bytes_read, extended_len;
17074 unsigned char op_code, extended_op, adj_opcode;
17075 CORE_ADDR baseaddr;
17076 struct objfile *objfile = cu->objfile;
17077 bfd *abfd = objfile->obfd;
17078 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17079 const int decode_for_pst_p = (pst != NULL);
17080 struct subfile *last_subfile = NULL;
17081 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
17084 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17086 line_ptr = lh->statement_program_start;
17087 line_end = lh->statement_program_end;
17089 /* Read the statement sequences until there's nothing left. */
17090 while (line_ptr < line_end)
17092 /* state machine registers */
17093 CORE_ADDR address = 0;
17094 unsigned int file = 1;
17095 unsigned int line = 1;
17096 unsigned int column = 0;
17097 int is_stmt = lh->default_is_stmt;
17098 int basic_block = 0;
17099 int end_sequence = 0;
17101 unsigned char op_index = 0;
17103 if (!decode_for_pst_p && lh->num_file_names >= file)
17105 /* Start a subfile for the current file of the state machine. */
17106 /* lh->include_dirs and lh->file_names are 0-based, but the
17107 directory and file name numbers in the statement program
17109 struct file_entry *fe = &lh->file_names[file - 1];
17110 const char *dir = NULL;
17113 dir = lh->include_dirs[fe->dir_index - 1];
17115 dwarf2_start_subfile (fe->name, dir, comp_dir);
17118 /* Decode the table. */
17119 while (!end_sequence)
17121 op_code = read_1_byte (abfd, line_ptr);
17123 if (line_ptr > line_end)
17125 dwarf2_debug_line_missing_end_sequence_complaint ();
17129 if (op_code >= lh->opcode_base)
17131 /* Special operand. */
17132 adj_opcode = op_code - lh->opcode_base;
17133 address += (((op_index + (adj_opcode / lh->line_range))
17134 / lh->maximum_ops_per_instruction)
17135 * lh->minimum_instruction_length);
17136 op_index = ((op_index + (adj_opcode / lh->line_range))
17137 % lh->maximum_ops_per_instruction);
17138 line += lh->line_base + (adj_opcode % lh->line_range);
17139 if (lh->num_file_names < file || file == 0)
17140 dwarf2_debug_line_missing_file_complaint ();
17141 /* For now we ignore lines not starting on an
17142 instruction boundary. */
17143 else if (op_index == 0)
17145 lh->file_names[file - 1].included_p = 1;
17146 if (!decode_for_pst_p && is_stmt)
17148 if (last_subfile != current_subfile)
17150 addr = gdbarch_addr_bits_remove (gdbarch, address);
17152 (*p_record_line) (last_subfile, 0, addr);
17153 last_subfile = current_subfile;
17155 /* Append row to matrix using current values. */
17156 addr = gdbarch_addr_bits_remove (gdbarch, address);
17157 (*p_record_line) (current_subfile, line, addr);
17162 else switch (op_code)
17164 case DW_LNS_extended_op:
17165 extended_len = read_unsigned_leb128 (abfd, line_ptr,
17167 line_ptr += bytes_read;
17168 extended_end = line_ptr + extended_len;
17169 extended_op = read_1_byte (abfd, line_ptr);
17171 switch (extended_op)
17173 case DW_LNE_end_sequence:
17174 p_record_line = record_line;
17177 case DW_LNE_set_address:
17178 address = read_address (abfd, line_ptr, cu, &bytes_read);
17180 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
17182 /* This line table is for a function which has been
17183 GCd by the linker. Ignore it. PR gdb/12528 */
17186 = line_ptr - get_debug_line_section (cu)->buffer;
17188 complaint (&symfile_complaints,
17189 _(".debug_line address at offset 0x%lx is 0 "
17191 line_offset, objfile_name (objfile));
17192 p_record_line = noop_record_line;
17196 line_ptr += bytes_read;
17197 address += baseaddr;
17199 case DW_LNE_define_file:
17201 const char *cur_file;
17202 unsigned int dir_index, mod_time, length;
17204 cur_file = read_direct_string (abfd, line_ptr,
17206 line_ptr += bytes_read;
17208 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17209 line_ptr += bytes_read;
17211 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17212 line_ptr += bytes_read;
17214 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17215 line_ptr += bytes_read;
17216 add_file_name (lh, cur_file, dir_index, mod_time, length);
17219 case DW_LNE_set_discriminator:
17220 /* The discriminator is not interesting to the debugger;
17222 line_ptr = extended_end;
17225 complaint (&symfile_complaints,
17226 _("mangled .debug_line section"));
17229 /* Make sure that we parsed the extended op correctly. If e.g.
17230 we expected a different address size than the producer used,
17231 we may have read the wrong number of bytes. */
17232 if (line_ptr != extended_end)
17234 complaint (&symfile_complaints,
17235 _("mangled .debug_line section"));
17240 if (lh->num_file_names < file || file == 0)
17241 dwarf2_debug_line_missing_file_complaint ();
17244 lh->file_names[file - 1].included_p = 1;
17245 if (!decode_for_pst_p && is_stmt)
17247 if (last_subfile != current_subfile)
17249 addr = gdbarch_addr_bits_remove (gdbarch, address);
17251 (*p_record_line) (last_subfile, 0, addr);
17252 last_subfile = current_subfile;
17254 addr = gdbarch_addr_bits_remove (gdbarch, address);
17255 (*p_record_line) (current_subfile, line, addr);
17260 case DW_LNS_advance_pc:
17263 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17265 address += (((op_index + adjust)
17266 / lh->maximum_ops_per_instruction)
17267 * lh->minimum_instruction_length);
17268 op_index = ((op_index + adjust)
17269 % lh->maximum_ops_per_instruction);
17270 line_ptr += bytes_read;
17273 case DW_LNS_advance_line:
17274 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
17275 line_ptr += bytes_read;
17277 case DW_LNS_set_file:
17279 /* The arrays lh->include_dirs and lh->file_names are
17280 0-based, but the directory and file name numbers in
17281 the statement program are 1-based. */
17282 struct file_entry *fe;
17283 const char *dir = NULL;
17285 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17286 line_ptr += bytes_read;
17287 if (lh->num_file_names < file || file == 0)
17288 dwarf2_debug_line_missing_file_complaint ();
17291 fe = &lh->file_names[file - 1];
17293 dir = lh->include_dirs[fe->dir_index - 1];
17294 if (!decode_for_pst_p)
17296 last_subfile = current_subfile;
17297 dwarf2_start_subfile (fe->name, dir, comp_dir);
17302 case DW_LNS_set_column:
17303 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17304 line_ptr += bytes_read;
17306 case DW_LNS_negate_stmt:
17307 is_stmt = (!is_stmt);
17309 case DW_LNS_set_basic_block:
17312 /* Add to the address register of the state machine the
17313 address increment value corresponding to special opcode
17314 255. I.e., this value is scaled by the minimum
17315 instruction length since special opcode 255 would have
17316 scaled the increment. */
17317 case DW_LNS_const_add_pc:
17319 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
17321 address += (((op_index + adjust)
17322 / lh->maximum_ops_per_instruction)
17323 * lh->minimum_instruction_length);
17324 op_index = ((op_index + adjust)
17325 % lh->maximum_ops_per_instruction);
17328 case DW_LNS_fixed_advance_pc:
17329 address += read_2_bytes (abfd, line_ptr);
17335 /* Unknown standard opcode, ignore it. */
17338 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
17340 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17341 line_ptr += bytes_read;
17346 if (lh->num_file_names < file || file == 0)
17347 dwarf2_debug_line_missing_file_complaint ();
17350 lh->file_names[file - 1].included_p = 1;
17351 if (!decode_for_pst_p)
17353 addr = gdbarch_addr_bits_remove (gdbarch, address);
17354 (*p_record_line) (current_subfile, 0, addr);
17360 /* Decode the Line Number Program (LNP) for the given line_header
17361 structure and CU. The actual information extracted and the type
17362 of structures created from the LNP depends on the value of PST.
17364 1. If PST is NULL, then this procedure uses the data from the program
17365 to create all necessary symbol tables, and their linetables.
17367 2. If PST is not NULL, this procedure reads the program to determine
17368 the list of files included by the unit represented by PST, and
17369 builds all the associated partial symbol tables.
17371 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
17372 It is used for relative paths in the line table.
17373 NOTE: When processing partial symtabs (pst != NULL),
17374 comp_dir == pst->dirname.
17376 NOTE: It is important that psymtabs have the same file name (via strcmp)
17377 as the corresponding symtab. Since COMP_DIR is not used in the name of the
17378 symtab we don't use it in the name of the psymtabs we create.
17379 E.g. expand_line_sal requires this when finding psymtabs to expand.
17380 A good testcase for this is mb-inline.exp. */
17383 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
17384 struct dwarf2_cu *cu, struct partial_symtab *pst,
17385 int want_line_info)
17387 struct objfile *objfile = cu->objfile;
17388 const int decode_for_pst_p = (pst != NULL);
17389 struct subfile *first_subfile = current_subfile;
17391 if (want_line_info)
17392 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
17394 if (decode_for_pst_p)
17398 /* Now that we're done scanning the Line Header Program, we can
17399 create the psymtab of each included file. */
17400 for (file_index = 0; file_index < lh->num_file_names; file_index++)
17401 if (lh->file_names[file_index].included_p == 1)
17403 const char *include_name =
17404 psymtab_include_file_name (lh, file_index, pst, comp_dir);
17405 if (include_name != NULL)
17406 dwarf2_create_include_psymtab (include_name, pst, objfile);
17411 /* Make sure a symtab is created for every file, even files
17412 which contain only variables (i.e. no code with associated
17416 for (i = 0; i < lh->num_file_names; i++)
17418 const char *dir = NULL;
17419 struct file_entry *fe;
17421 fe = &lh->file_names[i];
17423 dir = lh->include_dirs[fe->dir_index - 1];
17424 dwarf2_start_subfile (fe->name, dir, comp_dir);
17426 /* Skip the main file; we don't need it, and it must be
17427 allocated last, so that it will show up before the
17428 non-primary symtabs in the objfile's symtab list. */
17429 if (current_subfile == first_subfile)
17432 if (current_subfile->symtab == NULL)
17433 current_subfile->symtab = allocate_symtab (current_subfile->name,
17435 fe->symtab = current_subfile->symtab;
17440 /* Start a subfile for DWARF. FILENAME is the name of the file and
17441 DIRNAME the name of the source directory which contains FILENAME
17442 or NULL if not known. COMP_DIR is the compilation directory for the
17443 linetable's compilation unit or NULL if not known.
17444 This routine tries to keep line numbers from identical absolute and
17445 relative file names in a common subfile.
17447 Using the `list' example from the GDB testsuite, which resides in
17448 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
17449 of /srcdir/list0.c yields the following debugging information for list0.c:
17451 DW_AT_name: /srcdir/list0.c
17452 DW_AT_comp_dir: /compdir
17453 files.files[0].name: list0.h
17454 files.files[0].dir: /srcdir
17455 files.files[1].name: list0.c
17456 files.files[1].dir: /srcdir
17458 The line number information for list0.c has to end up in a single
17459 subfile, so that `break /srcdir/list0.c:1' works as expected.
17460 start_subfile will ensure that this happens provided that we pass the
17461 concatenation of files.files[1].dir and files.files[1].name as the
17465 dwarf2_start_subfile (const char *filename, const char *dirname,
17466 const char *comp_dir)
17470 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
17471 `start_symtab' will always pass the contents of DW_AT_comp_dir as
17472 second argument to start_subfile. To be consistent, we do the
17473 same here. In order not to lose the line information directory,
17474 we concatenate it to the filename when it makes sense.
17475 Note that the Dwarf3 standard says (speaking of filenames in line
17476 information): ``The directory index is ignored for file names
17477 that represent full path names''. Thus ignoring dirname in the
17478 `else' branch below isn't an issue. */
17480 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
17482 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
17486 start_subfile (filename, comp_dir);
17492 /* Start a symtab for DWARF.
17493 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
17496 dwarf2_start_symtab (struct dwarf2_cu *cu,
17497 const char *name, const char *comp_dir, CORE_ADDR low_pc)
17499 start_symtab (name, comp_dir, low_pc);
17500 record_debugformat ("DWARF 2");
17501 record_producer (cu->producer);
17503 /* We assume that we're processing GCC output. */
17504 processing_gcc_compilation = 2;
17506 cu->processing_has_namespace_info = 0;
17510 var_decode_location (struct attribute *attr, struct symbol *sym,
17511 struct dwarf2_cu *cu)
17513 struct objfile *objfile = cu->objfile;
17514 struct comp_unit_head *cu_header = &cu->header;
17516 /* NOTE drow/2003-01-30: There used to be a comment and some special
17517 code here to turn a symbol with DW_AT_external and a
17518 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
17519 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
17520 with some versions of binutils) where shared libraries could have
17521 relocations against symbols in their debug information - the
17522 minimal symbol would have the right address, but the debug info
17523 would not. It's no longer necessary, because we will explicitly
17524 apply relocations when we read in the debug information now. */
17526 /* A DW_AT_location attribute with no contents indicates that a
17527 variable has been optimized away. */
17528 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
17530 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17534 /* Handle one degenerate form of location expression specially, to
17535 preserve GDB's previous behavior when section offsets are
17536 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
17537 then mark this symbol as LOC_STATIC. */
17539 if (attr_form_is_block (attr)
17540 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
17541 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
17542 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
17543 && (DW_BLOCK (attr)->size
17544 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
17546 unsigned int dummy;
17548 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
17549 SYMBOL_VALUE_ADDRESS (sym) =
17550 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
17552 SYMBOL_VALUE_ADDRESS (sym) =
17553 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
17554 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
17555 fixup_symbol_section (sym, objfile);
17556 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
17557 SYMBOL_SECTION (sym));
17561 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
17562 expression evaluator, and use LOC_COMPUTED only when necessary
17563 (i.e. when the value of a register or memory location is
17564 referenced, or a thread-local block, etc.). Then again, it might
17565 not be worthwhile. I'm assuming that it isn't unless performance
17566 or memory numbers show me otherwise. */
17568 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
17570 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
17571 cu->has_loclist = 1;
17574 /* Given a pointer to a DWARF information entry, figure out if we need
17575 to make a symbol table entry for it, and if so, create a new entry
17576 and return a pointer to it.
17577 If TYPE is NULL, determine symbol type from the die, otherwise
17578 used the passed type.
17579 If SPACE is not NULL, use it to hold the new symbol. If it is
17580 NULL, allocate a new symbol on the objfile's obstack. */
17582 static struct symbol *
17583 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
17584 struct symbol *space)
17586 struct objfile *objfile = cu->objfile;
17587 struct symbol *sym = NULL;
17589 struct attribute *attr = NULL;
17590 struct attribute *attr2 = NULL;
17591 CORE_ADDR baseaddr;
17592 struct pending **list_to_add = NULL;
17594 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
17596 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17598 name = dwarf2_name (die, cu);
17601 const char *linkagename;
17602 int suppress_add = 0;
17607 sym = allocate_symbol (objfile);
17608 OBJSTAT (objfile, n_syms++);
17610 /* Cache this symbol's name and the name's demangled form (if any). */
17611 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
17612 linkagename = dwarf2_physname (name, die, cu);
17613 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
17615 /* Fortran does not have mangling standard and the mangling does differ
17616 between gfortran, iFort etc. */
17617 if (cu->language == language_fortran
17618 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
17619 symbol_set_demangled_name (&(sym->ginfo),
17620 dwarf2_full_name (name, die, cu),
17623 /* Default assumptions.
17624 Use the passed type or decode it from the die. */
17625 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17626 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17628 SYMBOL_TYPE (sym) = type;
17630 SYMBOL_TYPE (sym) = die_type (die, cu);
17631 attr = dwarf2_attr (die,
17632 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
17636 SYMBOL_LINE (sym) = DW_UNSND (attr);
17639 attr = dwarf2_attr (die,
17640 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
17644 int file_index = DW_UNSND (attr);
17646 if (cu->line_header == NULL
17647 || file_index > cu->line_header->num_file_names)
17648 complaint (&symfile_complaints,
17649 _("file index out of range"));
17650 else if (file_index > 0)
17652 struct file_entry *fe;
17654 fe = &cu->line_header->file_names[file_index - 1];
17655 SYMBOL_SYMTAB (sym) = fe->symtab;
17662 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
17664 SYMBOL_VALUE_ADDRESS (sym)
17665 = attr_value_as_address (attr) + baseaddr;
17666 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
17667 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
17668 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
17669 add_symbol_to_list (sym, cu->list_in_scope);
17671 case DW_TAG_subprogram:
17672 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17674 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17675 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17676 if ((attr2 && (DW_UNSND (attr2) != 0))
17677 || cu->language == language_ada)
17679 /* Subprograms marked external are stored as a global symbol.
17680 Ada subprograms, whether marked external or not, are always
17681 stored as a global symbol, because we want to be able to
17682 access them globally. For instance, we want to be able
17683 to break on a nested subprogram without having to
17684 specify the context. */
17685 list_to_add = &global_symbols;
17689 list_to_add = cu->list_in_scope;
17692 case DW_TAG_inlined_subroutine:
17693 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17695 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17696 SYMBOL_INLINED (sym) = 1;
17697 list_to_add = cu->list_in_scope;
17699 case DW_TAG_template_value_param:
17701 /* Fall through. */
17702 case DW_TAG_constant:
17703 case DW_TAG_variable:
17704 case DW_TAG_member:
17705 /* Compilation with minimal debug info may result in
17706 variables with missing type entries. Change the
17707 misleading `void' type to something sensible. */
17708 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
17710 = objfile_type (objfile)->nodebug_data_symbol;
17712 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17713 /* In the case of DW_TAG_member, we should only be called for
17714 static const members. */
17715 if (die->tag == DW_TAG_member)
17717 /* dwarf2_add_field uses die_is_declaration,
17718 so we do the same. */
17719 gdb_assert (die_is_declaration (die, cu));
17724 dwarf2_const_value (attr, sym, cu);
17725 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17728 if (attr2 && (DW_UNSND (attr2) != 0))
17729 list_to_add = &global_symbols;
17731 list_to_add = cu->list_in_scope;
17735 attr = dwarf2_attr (die, DW_AT_location, cu);
17738 var_decode_location (attr, sym, cu);
17739 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17741 /* Fortran explicitly imports any global symbols to the local
17742 scope by DW_TAG_common_block. */
17743 if (cu->language == language_fortran && die->parent
17744 && die->parent->tag == DW_TAG_common_block)
17747 if (SYMBOL_CLASS (sym) == LOC_STATIC
17748 && SYMBOL_VALUE_ADDRESS (sym) == 0
17749 && !dwarf2_per_objfile->has_section_at_zero)
17751 /* When a static variable is eliminated by the linker,
17752 the corresponding debug information is not stripped
17753 out, but the variable address is set to null;
17754 do not add such variables into symbol table. */
17756 else if (attr2 && (DW_UNSND (attr2) != 0))
17758 /* Workaround gfortran PR debug/40040 - it uses
17759 DW_AT_location for variables in -fPIC libraries which may
17760 get overriden by other libraries/executable and get
17761 a different address. Resolve it by the minimal symbol
17762 which may come from inferior's executable using copy
17763 relocation. Make this workaround only for gfortran as for
17764 other compilers GDB cannot guess the minimal symbol
17765 Fortran mangling kind. */
17766 if (cu->language == language_fortran && die->parent
17767 && die->parent->tag == DW_TAG_module
17769 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
17770 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17772 /* A variable with DW_AT_external is never static,
17773 but it may be block-scoped. */
17774 list_to_add = (cu->list_in_scope == &file_symbols
17775 ? &global_symbols : cu->list_in_scope);
17778 list_to_add = cu->list_in_scope;
17782 /* We do not know the address of this symbol.
17783 If it is an external symbol and we have type information
17784 for it, enter the symbol as a LOC_UNRESOLVED symbol.
17785 The address of the variable will then be determined from
17786 the minimal symbol table whenever the variable is
17788 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17790 /* Fortran explicitly imports any global symbols to the local
17791 scope by DW_TAG_common_block. */
17792 if (cu->language == language_fortran && die->parent
17793 && die->parent->tag == DW_TAG_common_block)
17795 /* SYMBOL_CLASS doesn't matter here because
17796 read_common_block is going to reset it. */
17798 list_to_add = cu->list_in_scope;
17800 else if (attr2 && (DW_UNSND (attr2) != 0)
17801 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
17803 /* A variable with DW_AT_external is never static, but it
17804 may be block-scoped. */
17805 list_to_add = (cu->list_in_scope == &file_symbols
17806 ? &global_symbols : cu->list_in_scope);
17808 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17810 else if (!die_is_declaration (die, cu))
17812 /* Use the default LOC_OPTIMIZED_OUT class. */
17813 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
17815 list_to_add = cu->list_in_scope;
17819 case DW_TAG_formal_parameter:
17820 /* If we are inside a function, mark this as an argument. If
17821 not, we might be looking at an argument to an inlined function
17822 when we do not have enough information to show inlined frames;
17823 pretend it's a local variable in that case so that the user can
17825 if (context_stack_depth > 0
17826 && context_stack[context_stack_depth - 1].name != NULL)
17827 SYMBOL_IS_ARGUMENT (sym) = 1;
17828 attr = dwarf2_attr (die, DW_AT_location, cu);
17831 var_decode_location (attr, sym, cu);
17833 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17836 dwarf2_const_value (attr, sym, cu);
17839 list_to_add = cu->list_in_scope;
17841 case DW_TAG_unspecified_parameters:
17842 /* From varargs functions; gdb doesn't seem to have any
17843 interest in this information, so just ignore it for now.
17846 case DW_TAG_template_type_param:
17848 /* Fall through. */
17849 case DW_TAG_class_type:
17850 case DW_TAG_interface_type:
17851 case DW_TAG_structure_type:
17852 case DW_TAG_union_type:
17853 case DW_TAG_set_type:
17854 case DW_TAG_enumeration_type:
17855 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17856 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
17859 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
17860 really ever be static objects: otherwise, if you try
17861 to, say, break of a class's method and you're in a file
17862 which doesn't mention that class, it won't work unless
17863 the check for all static symbols in lookup_symbol_aux
17864 saves you. See the OtherFileClass tests in
17865 gdb.c++/namespace.exp. */
17869 list_to_add = (cu->list_in_scope == &file_symbols
17870 && (cu->language == language_cplus
17871 || cu->language == language_java)
17872 ? &global_symbols : cu->list_in_scope);
17874 /* The semantics of C++ state that "struct foo {
17875 ... }" also defines a typedef for "foo". A Java
17876 class declaration also defines a typedef for the
17878 if (cu->language == language_cplus
17879 || cu->language == language_java
17880 || cu->language == language_ada)
17882 /* The symbol's name is already allocated along
17883 with this objfile, so we don't need to
17884 duplicate it for the type. */
17885 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
17886 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
17891 case DW_TAG_typedef:
17892 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17893 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17894 list_to_add = cu->list_in_scope;
17896 case DW_TAG_base_type:
17897 case DW_TAG_subrange_type:
17898 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17899 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17900 list_to_add = cu->list_in_scope;
17902 case DW_TAG_enumerator:
17903 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17906 dwarf2_const_value (attr, sym, cu);
17909 /* NOTE: carlton/2003-11-10: See comment above in the
17910 DW_TAG_class_type, etc. block. */
17912 list_to_add = (cu->list_in_scope == &file_symbols
17913 && (cu->language == language_cplus
17914 || cu->language == language_java)
17915 ? &global_symbols : cu->list_in_scope);
17918 case DW_TAG_imported_declaration:
17919 case DW_TAG_namespace:
17920 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17921 list_to_add = &global_symbols;
17923 case DW_TAG_module:
17924 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17925 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
17926 list_to_add = &global_symbols;
17928 case DW_TAG_common_block:
17929 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
17930 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
17931 add_symbol_to_list (sym, cu->list_in_scope);
17934 /* Not a tag we recognize. Hopefully we aren't processing
17935 trash data, but since we must specifically ignore things
17936 we don't recognize, there is nothing else we should do at
17938 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
17939 dwarf_tag_name (die->tag));
17945 sym->hash_next = objfile->template_symbols;
17946 objfile->template_symbols = sym;
17947 list_to_add = NULL;
17950 if (list_to_add != NULL)
17951 add_symbol_to_list (sym, list_to_add);
17953 /* For the benefit of old versions of GCC, check for anonymous
17954 namespaces based on the demangled name. */
17955 if (!cu->processing_has_namespace_info
17956 && cu->language == language_cplus)
17957 cp_scan_for_anonymous_namespaces (sym, objfile);
17962 /* A wrapper for new_symbol_full that always allocates a new symbol. */
17964 static struct symbol *
17965 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
17967 return new_symbol_full (die, type, cu, NULL);
17970 /* Given an attr with a DW_FORM_dataN value in host byte order,
17971 zero-extend it as appropriate for the symbol's type. The DWARF
17972 standard (v4) is not entirely clear about the meaning of using
17973 DW_FORM_dataN for a constant with a signed type, where the type is
17974 wider than the data. The conclusion of a discussion on the DWARF
17975 list was that this is unspecified. We choose to always zero-extend
17976 because that is the interpretation long in use by GCC. */
17979 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
17980 struct dwarf2_cu *cu, LONGEST *value, int bits)
17982 struct objfile *objfile = cu->objfile;
17983 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
17984 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
17985 LONGEST l = DW_UNSND (attr);
17987 if (bits < sizeof (*value) * 8)
17989 l &= ((LONGEST) 1 << bits) - 1;
17992 else if (bits == sizeof (*value) * 8)
17996 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
17997 store_unsigned_integer (bytes, bits / 8, byte_order, l);
18004 /* Read a constant value from an attribute. Either set *VALUE, or if
18005 the value does not fit in *VALUE, set *BYTES - either already
18006 allocated on the objfile obstack, or newly allocated on OBSTACK,
18007 or, set *BATON, if we translated the constant to a location
18011 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
18012 const char *name, struct obstack *obstack,
18013 struct dwarf2_cu *cu,
18014 LONGEST *value, const gdb_byte **bytes,
18015 struct dwarf2_locexpr_baton **baton)
18017 struct objfile *objfile = cu->objfile;
18018 struct comp_unit_head *cu_header = &cu->header;
18019 struct dwarf_block *blk;
18020 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
18021 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18027 switch (attr->form)
18030 case DW_FORM_GNU_addr_index:
18034 if (TYPE_LENGTH (type) != cu_header->addr_size)
18035 dwarf2_const_value_length_mismatch_complaint (name,
18036 cu_header->addr_size,
18037 TYPE_LENGTH (type));
18038 /* Symbols of this form are reasonably rare, so we just
18039 piggyback on the existing location code rather than writing
18040 a new implementation of symbol_computed_ops. */
18041 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
18042 (*baton)->per_cu = cu->per_cu;
18043 gdb_assert ((*baton)->per_cu);
18045 (*baton)->size = 2 + cu_header->addr_size;
18046 data = obstack_alloc (obstack, (*baton)->size);
18047 (*baton)->data = data;
18049 data[0] = DW_OP_addr;
18050 store_unsigned_integer (&data[1], cu_header->addr_size,
18051 byte_order, DW_ADDR (attr));
18052 data[cu_header->addr_size + 1] = DW_OP_stack_value;
18055 case DW_FORM_string:
18057 case DW_FORM_GNU_str_index:
18058 case DW_FORM_GNU_strp_alt:
18059 /* DW_STRING is already allocated on the objfile obstack, point
18061 *bytes = (const gdb_byte *) DW_STRING (attr);
18063 case DW_FORM_block1:
18064 case DW_FORM_block2:
18065 case DW_FORM_block4:
18066 case DW_FORM_block:
18067 case DW_FORM_exprloc:
18068 blk = DW_BLOCK (attr);
18069 if (TYPE_LENGTH (type) != blk->size)
18070 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
18071 TYPE_LENGTH (type));
18072 *bytes = blk->data;
18075 /* The DW_AT_const_value attributes are supposed to carry the
18076 symbol's value "represented as it would be on the target
18077 architecture." By the time we get here, it's already been
18078 converted to host endianness, so we just need to sign- or
18079 zero-extend it as appropriate. */
18080 case DW_FORM_data1:
18081 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
18083 case DW_FORM_data2:
18084 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
18086 case DW_FORM_data4:
18087 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
18089 case DW_FORM_data8:
18090 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
18093 case DW_FORM_sdata:
18094 *value = DW_SND (attr);
18097 case DW_FORM_udata:
18098 *value = DW_UNSND (attr);
18102 complaint (&symfile_complaints,
18103 _("unsupported const value attribute form: '%s'"),
18104 dwarf_form_name (attr->form));
18111 /* Copy constant value from an attribute to a symbol. */
18114 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
18115 struct dwarf2_cu *cu)
18117 struct objfile *objfile = cu->objfile;
18118 struct comp_unit_head *cu_header = &cu->header;
18120 const gdb_byte *bytes;
18121 struct dwarf2_locexpr_baton *baton;
18123 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
18124 SYMBOL_PRINT_NAME (sym),
18125 &objfile->objfile_obstack, cu,
18126 &value, &bytes, &baton);
18130 SYMBOL_LOCATION_BATON (sym) = baton;
18131 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
18133 else if (bytes != NULL)
18135 SYMBOL_VALUE_BYTES (sym) = bytes;
18136 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
18140 SYMBOL_VALUE (sym) = value;
18141 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
18145 /* Return the type of the die in question using its DW_AT_type attribute. */
18147 static struct type *
18148 die_type (struct die_info *die, struct dwarf2_cu *cu)
18150 struct attribute *type_attr;
18152 type_attr = dwarf2_attr (die, DW_AT_type, cu);
18155 /* A missing DW_AT_type represents a void type. */
18156 return objfile_type (cu->objfile)->builtin_void;
18159 return lookup_die_type (die, type_attr, cu);
18162 /* True iff CU's producer generates GNAT Ada auxiliary information
18163 that allows to find parallel types through that information instead
18164 of having to do expensive parallel lookups by type name. */
18167 need_gnat_info (struct dwarf2_cu *cu)
18169 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
18170 of GNAT produces this auxiliary information, without any indication
18171 that it is produced. Part of enhancing the FSF version of GNAT
18172 to produce that information will be to put in place an indicator
18173 that we can use in order to determine whether the descriptive type
18174 info is available or not. One suggestion that has been made is
18175 to use a new attribute, attached to the CU die. For now, assume
18176 that the descriptive type info is not available. */
18180 /* Return the auxiliary type of the die in question using its
18181 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
18182 attribute is not present. */
18184 static struct type *
18185 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
18187 struct attribute *type_attr;
18189 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
18193 return lookup_die_type (die, type_attr, cu);
18196 /* If DIE has a descriptive_type attribute, then set the TYPE's
18197 descriptive type accordingly. */
18200 set_descriptive_type (struct type *type, struct die_info *die,
18201 struct dwarf2_cu *cu)
18203 struct type *descriptive_type = die_descriptive_type (die, cu);
18205 if (descriptive_type)
18207 ALLOCATE_GNAT_AUX_TYPE (type);
18208 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
18212 /* Return the containing type of the die in question using its
18213 DW_AT_containing_type attribute. */
18215 static struct type *
18216 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
18218 struct attribute *type_attr;
18220 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
18222 error (_("Dwarf Error: Problem turning containing type into gdb type "
18223 "[in module %s]"), objfile_name (cu->objfile));
18225 return lookup_die_type (die, type_attr, cu);
18228 /* Return an error marker type to use for the ill formed type in DIE/CU. */
18230 static struct type *
18231 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
18233 struct objfile *objfile = dwarf2_per_objfile->objfile;
18234 char *message, *saved;
18236 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
18237 objfile_name (objfile),
18238 cu->header.offset.sect_off,
18239 die->offset.sect_off);
18240 saved = obstack_copy0 (&objfile->objfile_obstack,
18241 message, strlen (message));
18244 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
18247 /* Look up the type of DIE in CU using its type attribute ATTR.
18248 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
18249 DW_AT_containing_type.
18250 If there is no type substitute an error marker. */
18252 static struct type *
18253 lookup_die_type (struct die_info *die, const struct attribute *attr,
18254 struct dwarf2_cu *cu)
18256 struct objfile *objfile = cu->objfile;
18257 struct type *this_type;
18259 gdb_assert (attr->name == DW_AT_type
18260 || attr->name == DW_AT_GNAT_descriptive_type
18261 || attr->name == DW_AT_containing_type);
18263 /* First see if we have it cached. */
18265 if (attr->form == DW_FORM_GNU_ref_alt)
18267 struct dwarf2_per_cu_data *per_cu;
18268 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18270 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
18271 this_type = get_die_type_at_offset (offset, per_cu);
18273 else if (attr_form_is_ref (attr))
18275 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18277 this_type = get_die_type_at_offset (offset, cu->per_cu);
18279 else if (attr->form == DW_FORM_ref_sig8)
18281 ULONGEST signature = DW_SIGNATURE (attr);
18283 return get_signatured_type (die, signature, cu);
18287 complaint (&symfile_complaints,
18288 _("Dwarf Error: Bad type attribute %s in DIE"
18289 " at 0x%x [in module %s]"),
18290 dwarf_attr_name (attr->name), die->offset.sect_off,
18291 objfile_name (objfile));
18292 return build_error_marker_type (cu, die);
18295 /* If not cached we need to read it in. */
18297 if (this_type == NULL)
18299 struct die_info *type_die = NULL;
18300 struct dwarf2_cu *type_cu = cu;
18302 if (attr_form_is_ref (attr))
18303 type_die = follow_die_ref (die, attr, &type_cu);
18304 if (type_die == NULL)
18305 return build_error_marker_type (cu, die);
18306 /* If we find the type now, it's probably because the type came
18307 from an inter-CU reference and the type's CU got expanded before
18309 this_type = read_type_die (type_die, type_cu);
18312 /* If we still don't have a type use an error marker. */
18314 if (this_type == NULL)
18315 return build_error_marker_type (cu, die);
18320 /* Return the type in DIE, CU.
18321 Returns NULL for invalid types.
18323 This first does a lookup in die_type_hash,
18324 and only reads the die in if necessary.
18326 NOTE: This can be called when reading in partial or full symbols. */
18328 static struct type *
18329 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
18331 struct type *this_type;
18333 this_type = get_die_type (die, cu);
18337 return read_type_die_1 (die, cu);
18340 /* Read the type in DIE, CU.
18341 Returns NULL for invalid types. */
18343 static struct type *
18344 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
18346 struct type *this_type = NULL;
18350 case DW_TAG_class_type:
18351 case DW_TAG_interface_type:
18352 case DW_TAG_structure_type:
18353 case DW_TAG_union_type:
18354 this_type = read_structure_type (die, cu);
18356 case DW_TAG_enumeration_type:
18357 this_type = read_enumeration_type (die, cu);
18359 case DW_TAG_subprogram:
18360 case DW_TAG_subroutine_type:
18361 case DW_TAG_inlined_subroutine:
18362 this_type = read_subroutine_type (die, cu);
18364 case DW_TAG_array_type:
18365 this_type = read_array_type (die, cu);
18367 case DW_TAG_set_type:
18368 this_type = read_set_type (die, cu);
18370 case DW_TAG_pointer_type:
18371 this_type = read_tag_pointer_type (die, cu);
18373 case DW_TAG_ptr_to_member_type:
18374 this_type = read_tag_ptr_to_member_type (die, cu);
18376 case DW_TAG_reference_type:
18377 this_type = read_tag_reference_type (die, cu);
18379 case DW_TAG_const_type:
18380 this_type = read_tag_const_type (die, cu);
18382 case DW_TAG_volatile_type:
18383 this_type = read_tag_volatile_type (die, cu);
18385 case DW_TAG_restrict_type:
18386 this_type = read_tag_restrict_type (die, cu);
18388 case DW_TAG_string_type:
18389 this_type = read_tag_string_type (die, cu);
18391 case DW_TAG_typedef:
18392 this_type = read_typedef (die, cu);
18394 case DW_TAG_subrange_type:
18395 this_type = read_subrange_type (die, cu);
18397 case DW_TAG_base_type:
18398 this_type = read_base_type (die, cu);
18400 case DW_TAG_unspecified_type:
18401 this_type = read_unspecified_type (die, cu);
18403 case DW_TAG_namespace:
18404 this_type = read_namespace_type (die, cu);
18406 case DW_TAG_module:
18407 this_type = read_module_type (die, cu);
18410 complaint (&symfile_complaints,
18411 _("unexpected tag in read_type_die: '%s'"),
18412 dwarf_tag_name (die->tag));
18419 /* See if we can figure out if the class lives in a namespace. We do
18420 this by looking for a member function; its demangled name will
18421 contain namespace info, if there is any.
18422 Return the computed name or NULL.
18423 Space for the result is allocated on the objfile's obstack.
18424 This is the full-die version of guess_partial_die_structure_name.
18425 In this case we know DIE has no useful parent. */
18428 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
18430 struct die_info *spec_die;
18431 struct dwarf2_cu *spec_cu;
18432 struct die_info *child;
18435 spec_die = die_specification (die, &spec_cu);
18436 if (spec_die != NULL)
18442 for (child = die->child;
18444 child = child->sibling)
18446 if (child->tag == DW_TAG_subprogram)
18448 struct attribute *attr;
18450 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
18452 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
18456 = language_class_name_from_physname (cu->language_defn,
18460 if (actual_name != NULL)
18462 const char *die_name = dwarf2_name (die, cu);
18464 if (die_name != NULL
18465 && strcmp (die_name, actual_name) != 0)
18467 /* Strip off the class name from the full name.
18468 We want the prefix. */
18469 int die_name_len = strlen (die_name);
18470 int actual_name_len = strlen (actual_name);
18472 /* Test for '::' as a sanity check. */
18473 if (actual_name_len > die_name_len + 2
18474 && actual_name[actual_name_len
18475 - die_name_len - 1] == ':')
18477 obstack_copy0 (&cu->objfile->objfile_obstack,
18479 actual_name_len - die_name_len - 2);
18482 xfree (actual_name);
18491 /* GCC might emit a nameless typedef that has a linkage name. Determine the
18492 prefix part in such case. See
18493 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18496 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
18498 struct attribute *attr;
18501 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
18502 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
18505 attr = dwarf2_attr (die, DW_AT_name, cu);
18506 if (attr != NULL && DW_STRING (attr) != NULL)
18509 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18511 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18512 if (attr == NULL || DW_STRING (attr) == NULL)
18515 /* dwarf2_name had to be already called. */
18516 gdb_assert (DW_STRING_IS_CANONICAL (attr));
18518 /* Strip the base name, keep any leading namespaces/classes. */
18519 base = strrchr (DW_STRING (attr), ':');
18520 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
18523 return obstack_copy0 (&cu->objfile->objfile_obstack,
18524 DW_STRING (attr), &base[-1] - DW_STRING (attr));
18527 /* Return the name of the namespace/class that DIE is defined within,
18528 or "" if we can't tell. The caller should not xfree the result.
18530 For example, if we're within the method foo() in the following
18540 then determine_prefix on foo's die will return "N::C". */
18542 static const char *
18543 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
18545 struct die_info *parent, *spec_die;
18546 struct dwarf2_cu *spec_cu;
18547 struct type *parent_type;
18550 if (cu->language != language_cplus && cu->language != language_java
18551 && cu->language != language_fortran)
18554 retval = anonymous_struct_prefix (die, cu);
18558 /* We have to be careful in the presence of DW_AT_specification.
18559 For example, with GCC 3.4, given the code
18563 // Definition of N::foo.
18567 then we'll have a tree of DIEs like this:
18569 1: DW_TAG_compile_unit
18570 2: DW_TAG_namespace // N
18571 3: DW_TAG_subprogram // declaration of N::foo
18572 4: DW_TAG_subprogram // definition of N::foo
18573 DW_AT_specification // refers to die #3
18575 Thus, when processing die #4, we have to pretend that we're in
18576 the context of its DW_AT_specification, namely the contex of die
18579 spec_die = die_specification (die, &spec_cu);
18580 if (spec_die == NULL)
18581 parent = die->parent;
18584 parent = spec_die->parent;
18588 if (parent == NULL)
18590 else if (parent->building_fullname)
18593 const char *parent_name;
18595 /* It has been seen on RealView 2.2 built binaries,
18596 DW_TAG_template_type_param types actually _defined_ as
18597 children of the parent class:
18600 template class <class Enum> Class{};
18601 Class<enum E> class_e;
18603 1: DW_TAG_class_type (Class)
18604 2: DW_TAG_enumeration_type (E)
18605 3: DW_TAG_enumerator (enum1:0)
18606 3: DW_TAG_enumerator (enum2:1)
18608 2: DW_TAG_template_type_param
18609 DW_AT_type DW_FORM_ref_udata (E)
18611 Besides being broken debug info, it can put GDB into an
18612 infinite loop. Consider:
18614 When we're building the full name for Class<E>, we'll start
18615 at Class, and go look over its template type parameters,
18616 finding E. We'll then try to build the full name of E, and
18617 reach here. We're now trying to build the full name of E,
18618 and look over the parent DIE for containing scope. In the
18619 broken case, if we followed the parent DIE of E, we'd again
18620 find Class, and once again go look at its template type
18621 arguments, etc., etc. Simply don't consider such parent die
18622 as source-level parent of this die (it can't be, the language
18623 doesn't allow it), and break the loop here. */
18624 name = dwarf2_name (die, cu);
18625 parent_name = dwarf2_name (parent, cu);
18626 complaint (&symfile_complaints,
18627 _("template param type '%s' defined within parent '%s'"),
18628 name ? name : "<unknown>",
18629 parent_name ? parent_name : "<unknown>");
18633 switch (parent->tag)
18635 case DW_TAG_namespace:
18636 parent_type = read_type_die (parent, cu);
18637 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
18638 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
18639 Work around this problem here. */
18640 if (cu->language == language_cplus
18641 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
18643 /* We give a name to even anonymous namespaces. */
18644 return TYPE_TAG_NAME (parent_type);
18645 case DW_TAG_class_type:
18646 case DW_TAG_interface_type:
18647 case DW_TAG_structure_type:
18648 case DW_TAG_union_type:
18649 case DW_TAG_module:
18650 parent_type = read_type_die (parent, cu);
18651 if (TYPE_TAG_NAME (parent_type) != NULL)
18652 return TYPE_TAG_NAME (parent_type);
18654 /* An anonymous structure is only allowed non-static data
18655 members; no typedefs, no member functions, et cetera.
18656 So it does not need a prefix. */
18658 case DW_TAG_compile_unit:
18659 case DW_TAG_partial_unit:
18660 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
18661 if (cu->language == language_cplus
18662 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
18663 && die->child != NULL
18664 && (die->tag == DW_TAG_class_type
18665 || die->tag == DW_TAG_structure_type
18666 || die->tag == DW_TAG_union_type))
18668 char *name = guess_full_die_structure_name (die, cu);
18673 case DW_TAG_enumeration_type:
18674 parent_type = read_type_die (parent, cu);
18675 if (TYPE_DECLARED_CLASS (parent_type))
18677 if (TYPE_TAG_NAME (parent_type) != NULL)
18678 return TYPE_TAG_NAME (parent_type);
18681 /* Fall through. */
18683 return determine_prefix (parent, cu);
18687 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
18688 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
18689 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
18690 an obconcat, otherwise allocate storage for the result. The CU argument is
18691 used to determine the language and hence, the appropriate separator. */
18693 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
18696 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
18697 int physname, struct dwarf2_cu *cu)
18699 const char *lead = "";
18702 if (suffix == NULL || suffix[0] == '\0'
18703 || prefix == NULL || prefix[0] == '\0')
18705 else if (cu->language == language_java)
18707 else if (cu->language == language_fortran && physname)
18709 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
18710 DW_AT_MIPS_linkage_name is preferred and used instead. */
18718 if (prefix == NULL)
18720 if (suffix == NULL)
18726 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
18728 strcpy (retval, lead);
18729 strcat (retval, prefix);
18730 strcat (retval, sep);
18731 strcat (retval, suffix);
18736 /* We have an obstack. */
18737 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
18741 /* Return sibling of die, NULL if no sibling. */
18743 static struct die_info *
18744 sibling_die (struct die_info *die)
18746 return die->sibling;
18749 /* Get name of a die, return NULL if not found. */
18751 static const char *
18752 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
18753 struct obstack *obstack)
18755 if (name && cu->language == language_cplus)
18757 char *canon_name = cp_canonicalize_string (name);
18759 if (canon_name != NULL)
18761 if (strcmp (canon_name, name) != 0)
18762 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
18763 xfree (canon_name);
18770 /* Get name of a die, return NULL if not found. */
18772 static const char *
18773 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
18775 struct attribute *attr;
18777 attr = dwarf2_attr (die, DW_AT_name, cu);
18778 if ((!attr || !DW_STRING (attr))
18779 && die->tag != DW_TAG_class_type
18780 && die->tag != DW_TAG_interface_type
18781 && die->tag != DW_TAG_structure_type
18782 && die->tag != DW_TAG_union_type)
18787 case DW_TAG_compile_unit:
18788 case DW_TAG_partial_unit:
18789 /* Compilation units have a DW_AT_name that is a filename, not
18790 a source language identifier. */
18791 case DW_TAG_enumeration_type:
18792 case DW_TAG_enumerator:
18793 /* These tags always have simple identifiers already; no need
18794 to canonicalize them. */
18795 return DW_STRING (attr);
18797 case DW_TAG_subprogram:
18798 /* Java constructors will all be named "<init>", so return
18799 the class name when we see this special case. */
18800 if (cu->language == language_java
18801 && DW_STRING (attr) != NULL
18802 && strcmp (DW_STRING (attr), "<init>") == 0)
18804 struct dwarf2_cu *spec_cu = cu;
18805 struct die_info *spec_die;
18807 /* GCJ will output '<init>' for Java constructor names.
18808 For this special case, return the name of the parent class. */
18810 /* GCJ may output suprogram DIEs with AT_specification set.
18811 If so, use the name of the specified DIE. */
18812 spec_die = die_specification (die, &spec_cu);
18813 if (spec_die != NULL)
18814 return dwarf2_name (spec_die, spec_cu);
18819 if (die->tag == DW_TAG_class_type)
18820 return dwarf2_name (die, cu);
18822 while (die->tag != DW_TAG_compile_unit
18823 && die->tag != DW_TAG_partial_unit);
18827 case DW_TAG_class_type:
18828 case DW_TAG_interface_type:
18829 case DW_TAG_structure_type:
18830 case DW_TAG_union_type:
18831 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
18832 structures or unions. These were of the form "._%d" in GCC 4.1,
18833 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
18834 and GCC 4.4. We work around this problem by ignoring these. */
18835 if (attr && DW_STRING (attr)
18836 && (strncmp (DW_STRING (attr), "._", 2) == 0
18837 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
18840 /* GCC might emit a nameless typedef that has a linkage name. See
18841 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18842 if (!attr || DW_STRING (attr) == NULL)
18844 char *demangled = NULL;
18846 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18848 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18850 if (attr == NULL || DW_STRING (attr) == NULL)
18853 /* Avoid demangling DW_STRING (attr) the second time on a second
18854 call for the same DIE. */
18855 if (!DW_STRING_IS_CANONICAL (attr))
18856 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
18862 /* FIXME: we already did this for the partial symbol... */
18863 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
18864 demangled, strlen (demangled));
18865 DW_STRING_IS_CANONICAL (attr) = 1;
18868 /* Strip any leading namespaces/classes, keep only the base name.
18869 DW_AT_name for named DIEs does not contain the prefixes. */
18870 base = strrchr (DW_STRING (attr), ':');
18871 if (base && base > DW_STRING (attr) && base[-1] == ':')
18874 return DW_STRING (attr);
18883 if (!DW_STRING_IS_CANONICAL (attr))
18886 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
18887 &cu->objfile->objfile_obstack);
18888 DW_STRING_IS_CANONICAL (attr) = 1;
18890 return DW_STRING (attr);
18893 /* Return the die that this die in an extension of, or NULL if there
18894 is none. *EXT_CU is the CU containing DIE on input, and the CU
18895 containing the return value on output. */
18897 static struct die_info *
18898 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
18900 struct attribute *attr;
18902 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
18906 return follow_die_ref (die, attr, ext_cu);
18909 /* Convert a DIE tag into its string name. */
18911 static const char *
18912 dwarf_tag_name (unsigned tag)
18914 const char *name = get_DW_TAG_name (tag);
18917 return "DW_TAG_<unknown>";
18922 /* Convert a DWARF attribute code into its string name. */
18924 static const char *
18925 dwarf_attr_name (unsigned attr)
18929 #ifdef MIPS /* collides with DW_AT_HP_block_index */
18930 if (attr == DW_AT_MIPS_fde)
18931 return "DW_AT_MIPS_fde";
18933 if (attr == DW_AT_HP_block_index)
18934 return "DW_AT_HP_block_index";
18937 name = get_DW_AT_name (attr);
18940 return "DW_AT_<unknown>";
18945 /* Convert a DWARF value form code into its string name. */
18947 static const char *
18948 dwarf_form_name (unsigned form)
18950 const char *name = get_DW_FORM_name (form);
18953 return "DW_FORM_<unknown>";
18959 dwarf_bool_name (unsigned mybool)
18967 /* Convert a DWARF type code into its string name. */
18969 static const char *
18970 dwarf_type_encoding_name (unsigned enc)
18972 const char *name = get_DW_ATE_name (enc);
18975 return "DW_ATE_<unknown>";
18981 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
18985 print_spaces (indent, f);
18986 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
18987 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
18989 if (die->parent != NULL)
18991 print_spaces (indent, f);
18992 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
18993 die->parent->offset.sect_off);
18996 print_spaces (indent, f);
18997 fprintf_unfiltered (f, " has children: %s\n",
18998 dwarf_bool_name (die->child != NULL));
19000 print_spaces (indent, f);
19001 fprintf_unfiltered (f, " attributes:\n");
19003 for (i = 0; i < die->num_attrs; ++i)
19005 print_spaces (indent, f);
19006 fprintf_unfiltered (f, " %s (%s) ",
19007 dwarf_attr_name (die->attrs[i].name),
19008 dwarf_form_name (die->attrs[i].form));
19010 switch (die->attrs[i].form)
19013 case DW_FORM_GNU_addr_index:
19014 fprintf_unfiltered (f, "address: ");
19015 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
19017 case DW_FORM_block2:
19018 case DW_FORM_block4:
19019 case DW_FORM_block:
19020 case DW_FORM_block1:
19021 fprintf_unfiltered (f, "block: size %s",
19022 pulongest (DW_BLOCK (&die->attrs[i])->size));
19024 case DW_FORM_exprloc:
19025 fprintf_unfiltered (f, "expression: size %s",
19026 pulongest (DW_BLOCK (&die->attrs[i])->size));
19028 case DW_FORM_ref_addr:
19029 fprintf_unfiltered (f, "ref address: ");
19030 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19032 case DW_FORM_GNU_ref_alt:
19033 fprintf_unfiltered (f, "alt ref address: ");
19034 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19040 case DW_FORM_ref_udata:
19041 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
19042 (long) (DW_UNSND (&die->attrs[i])));
19044 case DW_FORM_data1:
19045 case DW_FORM_data2:
19046 case DW_FORM_data4:
19047 case DW_FORM_data8:
19048 case DW_FORM_udata:
19049 case DW_FORM_sdata:
19050 fprintf_unfiltered (f, "constant: %s",
19051 pulongest (DW_UNSND (&die->attrs[i])));
19053 case DW_FORM_sec_offset:
19054 fprintf_unfiltered (f, "section offset: %s",
19055 pulongest (DW_UNSND (&die->attrs[i])));
19057 case DW_FORM_ref_sig8:
19058 fprintf_unfiltered (f, "signature: %s",
19059 hex_string (DW_SIGNATURE (&die->attrs[i])));
19061 case DW_FORM_string:
19063 case DW_FORM_GNU_str_index:
19064 case DW_FORM_GNU_strp_alt:
19065 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
19066 DW_STRING (&die->attrs[i])
19067 ? DW_STRING (&die->attrs[i]) : "",
19068 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
19071 if (DW_UNSND (&die->attrs[i]))
19072 fprintf_unfiltered (f, "flag: TRUE");
19074 fprintf_unfiltered (f, "flag: FALSE");
19076 case DW_FORM_flag_present:
19077 fprintf_unfiltered (f, "flag: TRUE");
19079 case DW_FORM_indirect:
19080 /* The reader will have reduced the indirect form to
19081 the "base form" so this form should not occur. */
19082 fprintf_unfiltered (f,
19083 "unexpected attribute form: DW_FORM_indirect");
19086 fprintf_unfiltered (f, "unsupported attribute form: %d.",
19087 die->attrs[i].form);
19090 fprintf_unfiltered (f, "\n");
19095 dump_die_for_error (struct die_info *die)
19097 dump_die_shallow (gdb_stderr, 0, die);
19101 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
19103 int indent = level * 4;
19105 gdb_assert (die != NULL);
19107 if (level >= max_level)
19110 dump_die_shallow (f, indent, die);
19112 if (die->child != NULL)
19114 print_spaces (indent, f);
19115 fprintf_unfiltered (f, " Children:");
19116 if (level + 1 < max_level)
19118 fprintf_unfiltered (f, "\n");
19119 dump_die_1 (f, level + 1, max_level, die->child);
19123 fprintf_unfiltered (f,
19124 " [not printed, max nesting level reached]\n");
19128 if (die->sibling != NULL && level > 0)
19130 dump_die_1 (f, level, max_level, die->sibling);
19134 /* This is called from the pdie macro in gdbinit.in.
19135 It's not static so gcc will keep a copy callable from gdb. */
19138 dump_die (struct die_info *die, int max_level)
19140 dump_die_1 (gdb_stdlog, 0, max_level, die);
19144 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
19148 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
19154 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
19158 dwarf2_get_ref_die_offset (const struct attribute *attr)
19160 sect_offset retval = { DW_UNSND (attr) };
19162 if (attr_form_is_ref (attr))
19165 retval.sect_off = 0;
19166 complaint (&symfile_complaints,
19167 _("unsupported die ref attribute form: '%s'"),
19168 dwarf_form_name (attr->form));
19172 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
19173 * the value held by the attribute is not constant. */
19176 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
19178 if (attr->form == DW_FORM_sdata)
19179 return DW_SND (attr);
19180 else if (attr->form == DW_FORM_udata
19181 || attr->form == DW_FORM_data1
19182 || attr->form == DW_FORM_data2
19183 || attr->form == DW_FORM_data4
19184 || attr->form == DW_FORM_data8)
19185 return DW_UNSND (attr);
19188 complaint (&symfile_complaints,
19189 _("Attribute value is not a constant (%s)"),
19190 dwarf_form_name (attr->form));
19191 return default_value;
19195 /* Follow reference or signature attribute ATTR of SRC_DIE.
19196 On entry *REF_CU is the CU of SRC_DIE.
19197 On exit *REF_CU is the CU of the result. */
19199 static struct die_info *
19200 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
19201 struct dwarf2_cu **ref_cu)
19203 struct die_info *die;
19205 if (attr_form_is_ref (attr))
19206 die = follow_die_ref (src_die, attr, ref_cu);
19207 else if (attr->form == DW_FORM_ref_sig8)
19208 die = follow_die_sig (src_die, attr, ref_cu);
19211 dump_die_for_error (src_die);
19212 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
19213 objfile_name ((*ref_cu)->objfile));
19219 /* Follow reference OFFSET.
19220 On entry *REF_CU is the CU of the source die referencing OFFSET.
19221 On exit *REF_CU is the CU of the result.
19222 Returns NULL if OFFSET is invalid. */
19224 static struct die_info *
19225 follow_die_offset (sect_offset offset, int offset_in_dwz,
19226 struct dwarf2_cu **ref_cu)
19228 struct die_info temp_die;
19229 struct dwarf2_cu *target_cu, *cu = *ref_cu;
19231 gdb_assert (cu->per_cu != NULL);
19235 if (cu->per_cu->is_debug_types)
19237 /* .debug_types CUs cannot reference anything outside their CU.
19238 If they need to, they have to reference a signatured type via
19239 DW_FORM_ref_sig8. */
19240 if (! offset_in_cu_p (&cu->header, offset))
19243 else if (offset_in_dwz != cu->per_cu->is_dwz
19244 || ! offset_in_cu_p (&cu->header, offset))
19246 struct dwarf2_per_cu_data *per_cu;
19248 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
19251 /* If necessary, add it to the queue and load its DIEs. */
19252 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
19253 load_full_comp_unit (per_cu, cu->language);
19255 target_cu = per_cu->cu;
19257 else if (cu->dies == NULL)
19259 /* We're loading full DIEs during partial symbol reading. */
19260 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
19261 load_full_comp_unit (cu->per_cu, language_minimal);
19264 *ref_cu = target_cu;
19265 temp_die.offset = offset;
19266 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
19269 /* Follow reference attribute ATTR of SRC_DIE.
19270 On entry *REF_CU is the CU of SRC_DIE.
19271 On exit *REF_CU is the CU of the result. */
19273 static struct die_info *
19274 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
19275 struct dwarf2_cu **ref_cu)
19277 sect_offset offset = dwarf2_get_ref_die_offset (attr);
19278 struct dwarf2_cu *cu = *ref_cu;
19279 struct die_info *die;
19281 die = follow_die_offset (offset,
19282 (attr->form == DW_FORM_GNU_ref_alt
19283 || cu->per_cu->is_dwz),
19286 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
19287 "at 0x%x [in module %s]"),
19288 offset.sect_off, src_die->offset.sect_off,
19289 objfile_name (cu->objfile));
19294 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
19295 Returned value is intended for DW_OP_call*. Returned
19296 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
19298 struct dwarf2_locexpr_baton
19299 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
19300 struct dwarf2_per_cu_data *per_cu,
19301 CORE_ADDR (*get_frame_pc) (void *baton),
19304 struct dwarf2_cu *cu;
19305 struct die_info *die;
19306 struct attribute *attr;
19307 struct dwarf2_locexpr_baton retval;
19309 dw2_setup (per_cu->objfile);
19311 if (per_cu->cu == NULL)
19315 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19317 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19318 offset.sect_off, objfile_name (per_cu->objfile));
19320 attr = dwarf2_attr (die, DW_AT_location, cu);
19323 /* DWARF: "If there is no such attribute, then there is no effect.".
19324 DATA is ignored if SIZE is 0. */
19326 retval.data = NULL;
19329 else if (attr_form_is_section_offset (attr))
19331 struct dwarf2_loclist_baton loclist_baton;
19332 CORE_ADDR pc = (*get_frame_pc) (baton);
19335 fill_in_loclist_baton (cu, &loclist_baton, attr);
19337 retval.data = dwarf2_find_location_expression (&loclist_baton,
19339 retval.size = size;
19343 if (!attr_form_is_block (attr))
19344 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
19345 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
19346 offset.sect_off, objfile_name (per_cu->objfile));
19348 retval.data = DW_BLOCK (attr)->data;
19349 retval.size = DW_BLOCK (attr)->size;
19351 retval.per_cu = cu->per_cu;
19353 age_cached_comp_units ();
19358 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
19361 struct dwarf2_locexpr_baton
19362 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
19363 struct dwarf2_per_cu_data *per_cu,
19364 CORE_ADDR (*get_frame_pc) (void *baton),
19367 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
19369 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
19372 /* Write a constant of a given type as target-ordered bytes into
19375 static const gdb_byte *
19376 write_constant_as_bytes (struct obstack *obstack,
19377 enum bfd_endian byte_order,
19384 *len = TYPE_LENGTH (type);
19385 result = obstack_alloc (obstack, *len);
19386 store_unsigned_integer (result, *len, byte_order, value);
19391 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
19392 pointer to the constant bytes and set LEN to the length of the
19393 data. If memory is needed, allocate it on OBSTACK. If the DIE
19394 does not have a DW_AT_const_value, return NULL. */
19397 dwarf2_fetch_constant_bytes (sect_offset offset,
19398 struct dwarf2_per_cu_data *per_cu,
19399 struct obstack *obstack,
19402 struct dwarf2_cu *cu;
19403 struct die_info *die;
19404 struct attribute *attr;
19405 const gdb_byte *result = NULL;
19408 enum bfd_endian byte_order;
19410 dw2_setup (per_cu->objfile);
19412 if (per_cu->cu == NULL)
19416 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19418 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19419 offset.sect_off, objfile_name (per_cu->objfile));
19422 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19426 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
19427 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19429 switch (attr->form)
19432 case DW_FORM_GNU_addr_index:
19436 *len = cu->header.addr_size;
19437 tem = obstack_alloc (obstack, *len);
19438 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
19442 case DW_FORM_string:
19444 case DW_FORM_GNU_str_index:
19445 case DW_FORM_GNU_strp_alt:
19446 /* DW_STRING is already allocated on the objfile obstack, point
19448 result = (const gdb_byte *) DW_STRING (attr);
19449 *len = strlen (DW_STRING (attr));
19451 case DW_FORM_block1:
19452 case DW_FORM_block2:
19453 case DW_FORM_block4:
19454 case DW_FORM_block:
19455 case DW_FORM_exprloc:
19456 result = DW_BLOCK (attr)->data;
19457 *len = DW_BLOCK (attr)->size;
19460 /* The DW_AT_const_value attributes are supposed to carry the
19461 symbol's value "represented as it would be on the target
19462 architecture." By the time we get here, it's already been
19463 converted to host endianness, so we just need to sign- or
19464 zero-extend it as appropriate. */
19465 case DW_FORM_data1:
19466 type = die_type (die, cu);
19467 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
19468 if (result == NULL)
19469 result = write_constant_as_bytes (obstack, byte_order,
19472 case DW_FORM_data2:
19473 type = die_type (die, cu);
19474 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
19475 if (result == NULL)
19476 result = write_constant_as_bytes (obstack, byte_order,
19479 case DW_FORM_data4:
19480 type = die_type (die, cu);
19481 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
19482 if (result == NULL)
19483 result = write_constant_as_bytes (obstack, byte_order,
19486 case DW_FORM_data8:
19487 type = die_type (die, cu);
19488 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
19489 if (result == NULL)
19490 result = write_constant_as_bytes (obstack, byte_order,
19494 case DW_FORM_sdata:
19495 type = die_type (die, cu);
19496 result = write_constant_as_bytes (obstack, byte_order,
19497 type, DW_SND (attr), len);
19500 case DW_FORM_udata:
19501 type = die_type (die, cu);
19502 result = write_constant_as_bytes (obstack, byte_order,
19503 type, DW_UNSND (attr), len);
19507 complaint (&symfile_complaints,
19508 _("unsupported const value attribute form: '%s'"),
19509 dwarf_form_name (attr->form));
19516 /* Return the type of the DIE at DIE_OFFSET in the CU named by
19520 dwarf2_get_die_type (cu_offset die_offset,
19521 struct dwarf2_per_cu_data *per_cu)
19523 sect_offset die_offset_sect;
19525 dw2_setup (per_cu->objfile);
19527 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
19528 return get_die_type_at_offset (die_offset_sect, per_cu);
19531 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
19532 On entry *REF_CU is the CU of SRC_DIE.
19533 On exit *REF_CU is the CU of the result.
19534 Returns NULL if the referenced DIE isn't found. */
19536 static struct die_info *
19537 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
19538 struct dwarf2_cu **ref_cu)
19540 struct objfile *objfile = (*ref_cu)->objfile;
19541 struct die_info temp_die;
19542 struct dwarf2_cu *sig_cu;
19543 struct die_info *die;
19545 /* While it might be nice to assert sig_type->type == NULL here,
19546 we can get here for DW_AT_imported_declaration where we need
19547 the DIE not the type. */
19549 /* If necessary, add it to the queue and load its DIEs. */
19551 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
19552 read_signatured_type (sig_type);
19554 sig_cu = sig_type->per_cu.cu;
19555 gdb_assert (sig_cu != NULL);
19556 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
19557 temp_die.offset = sig_type->type_offset_in_section;
19558 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
19559 temp_die.offset.sect_off);
19562 /* For .gdb_index version 7 keep track of included TUs.
19563 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
19564 if (dwarf2_per_objfile->index_table != NULL
19565 && dwarf2_per_objfile->index_table->version <= 7)
19567 VEC_safe_push (dwarf2_per_cu_ptr,
19568 (*ref_cu)->per_cu->imported_symtabs,
19579 /* Follow signatured type referenced by ATTR in SRC_DIE.
19580 On entry *REF_CU is the CU of SRC_DIE.
19581 On exit *REF_CU is the CU of the result.
19582 The result is the DIE of the type.
19583 If the referenced type cannot be found an error is thrown. */
19585 static struct die_info *
19586 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
19587 struct dwarf2_cu **ref_cu)
19589 ULONGEST signature = DW_SIGNATURE (attr);
19590 struct signatured_type *sig_type;
19591 struct die_info *die;
19593 gdb_assert (attr->form == DW_FORM_ref_sig8);
19595 sig_type = lookup_signatured_type (*ref_cu, signature);
19596 /* sig_type will be NULL if the signatured type is missing from
19598 if (sig_type == NULL)
19600 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
19601 " from DIE at 0x%x [in module %s]"),
19602 hex_string (signature), src_die->offset.sect_off,
19603 objfile_name ((*ref_cu)->objfile));
19606 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
19609 dump_die_for_error (src_die);
19610 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
19611 " from DIE at 0x%x [in module %s]"),
19612 hex_string (signature), src_die->offset.sect_off,
19613 objfile_name ((*ref_cu)->objfile));
19619 /* Get the type specified by SIGNATURE referenced in DIE/CU,
19620 reading in and processing the type unit if necessary. */
19622 static struct type *
19623 get_signatured_type (struct die_info *die, ULONGEST signature,
19624 struct dwarf2_cu *cu)
19626 struct signatured_type *sig_type;
19627 struct dwarf2_cu *type_cu;
19628 struct die_info *type_die;
19631 sig_type = lookup_signatured_type (cu, signature);
19632 /* sig_type will be NULL if the signatured type is missing from
19634 if (sig_type == NULL)
19636 complaint (&symfile_complaints,
19637 _("Dwarf Error: Cannot find signatured DIE %s referenced"
19638 " from DIE at 0x%x [in module %s]"),
19639 hex_string (signature), die->offset.sect_off,
19640 objfile_name (dwarf2_per_objfile->objfile));
19641 return build_error_marker_type (cu, die);
19644 /* If we already know the type we're done. */
19645 if (sig_type->type != NULL)
19646 return sig_type->type;
19649 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
19650 if (type_die != NULL)
19652 /* N.B. We need to call get_die_type to ensure only one type for this DIE
19653 is created. This is important, for example, because for c++ classes
19654 we need TYPE_NAME set which is only done by new_symbol. Blech. */
19655 type = read_type_die (type_die, type_cu);
19658 complaint (&symfile_complaints,
19659 _("Dwarf Error: Cannot build signatured type %s"
19660 " referenced from DIE at 0x%x [in module %s]"),
19661 hex_string (signature), die->offset.sect_off,
19662 objfile_name (dwarf2_per_objfile->objfile));
19663 type = build_error_marker_type (cu, die);
19668 complaint (&symfile_complaints,
19669 _("Dwarf Error: Problem reading signatured DIE %s referenced"
19670 " from DIE at 0x%x [in module %s]"),
19671 hex_string (signature), die->offset.sect_off,
19672 objfile_name (dwarf2_per_objfile->objfile));
19673 type = build_error_marker_type (cu, die);
19675 sig_type->type = type;
19680 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
19681 reading in and processing the type unit if necessary. */
19683 static struct type *
19684 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
19685 struct dwarf2_cu *cu) /* ARI: editCase function */
19687 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
19688 if (attr_form_is_ref (attr))
19690 struct dwarf2_cu *type_cu = cu;
19691 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
19693 return read_type_die (type_die, type_cu);
19695 else if (attr->form == DW_FORM_ref_sig8)
19697 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
19701 complaint (&symfile_complaints,
19702 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
19703 " at 0x%x [in module %s]"),
19704 dwarf_form_name (attr->form), die->offset.sect_off,
19705 objfile_name (dwarf2_per_objfile->objfile));
19706 return build_error_marker_type (cu, die);
19710 /* Load the DIEs associated with type unit PER_CU into memory. */
19713 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
19715 struct signatured_type *sig_type;
19717 /* Caller is responsible for ensuring type_unit_groups don't get here. */
19718 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
19720 /* We have the per_cu, but we need the signatured_type.
19721 Fortunately this is an easy translation. */
19722 gdb_assert (per_cu->is_debug_types);
19723 sig_type = (struct signatured_type *) per_cu;
19725 gdb_assert (per_cu->cu == NULL);
19727 read_signatured_type (sig_type);
19729 gdb_assert (per_cu->cu != NULL);
19732 /* die_reader_func for read_signatured_type.
19733 This is identical to load_full_comp_unit_reader,
19734 but is kept separate for now. */
19737 read_signatured_type_reader (const struct die_reader_specs *reader,
19738 const gdb_byte *info_ptr,
19739 struct die_info *comp_unit_die,
19743 struct dwarf2_cu *cu = reader->cu;
19745 gdb_assert (cu->die_hash == NULL);
19747 htab_create_alloc_ex (cu->header.length / 12,
19751 &cu->comp_unit_obstack,
19752 hashtab_obstack_allocate,
19753 dummy_obstack_deallocate);
19756 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
19757 &info_ptr, comp_unit_die);
19758 cu->dies = comp_unit_die;
19759 /* comp_unit_die is not stored in die_hash, no need. */
19761 /* We try not to read any attributes in this function, because not
19762 all CUs needed for references have been loaded yet, and symbol
19763 table processing isn't initialized. But we have to set the CU language,
19764 or we won't be able to build types correctly.
19765 Similarly, if we do not read the producer, we can not apply
19766 producer-specific interpretation. */
19767 prepare_one_comp_unit (cu, cu->dies, language_minimal);
19770 /* Read in a signatured type and build its CU and DIEs.
19771 If the type is a stub for the real type in a DWO file,
19772 read in the real type from the DWO file as well. */
19775 read_signatured_type (struct signatured_type *sig_type)
19777 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
19779 gdb_assert (per_cu->is_debug_types);
19780 gdb_assert (per_cu->cu == NULL);
19782 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
19783 read_signatured_type_reader, NULL);
19784 sig_type->per_cu.tu_read = 1;
19787 /* Decode simple location descriptions.
19788 Given a pointer to a dwarf block that defines a location, compute
19789 the location and return the value.
19791 NOTE drow/2003-11-18: This function is called in two situations
19792 now: for the address of static or global variables (partial symbols
19793 only) and for offsets into structures which are expected to be
19794 (more or less) constant. The partial symbol case should go away,
19795 and only the constant case should remain. That will let this
19796 function complain more accurately. A few special modes are allowed
19797 without complaint for global variables (for instance, global
19798 register values and thread-local values).
19800 A location description containing no operations indicates that the
19801 object is optimized out. The return value is 0 for that case.
19802 FIXME drow/2003-11-16: No callers check for this case any more; soon all
19803 callers will only want a very basic result and this can become a
19806 Note that stack[0] is unused except as a default error return. */
19809 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
19811 struct objfile *objfile = cu->objfile;
19813 size_t size = blk->size;
19814 const gdb_byte *data = blk->data;
19815 CORE_ADDR stack[64];
19817 unsigned int bytes_read, unsnd;
19823 stack[++stacki] = 0;
19862 stack[++stacki] = op - DW_OP_lit0;
19897 stack[++stacki] = op - DW_OP_reg0;
19899 dwarf2_complex_location_expr_complaint ();
19903 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
19905 stack[++stacki] = unsnd;
19907 dwarf2_complex_location_expr_complaint ();
19911 stack[++stacki] = read_address (objfile->obfd, &data[i],
19916 case DW_OP_const1u:
19917 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
19921 case DW_OP_const1s:
19922 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
19926 case DW_OP_const2u:
19927 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
19931 case DW_OP_const2s:
19932 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
19936 case DW_OP_const4u:
19937 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
19941 case DW_OP_const4s:
19942 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
19946 case DW_OP_const8u:
19947 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
19952 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
19958 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
19963 stack[stacki + 1] = stack[stacki];
19968 stack[stacki - 1] += stack[stacki];
19972 case DW_OP_plus_uconst:
19973 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
19979 stack[stacki - 1] -= stack[stacki];
19984 /* If we're not the last op, then we definitely can't encode
19985 this using GDB's address_class enum. This is valid for partial
19986 global symbols, although the variable's address will be bogus
19989 dwarf2_complex_location_expr_complaint ();
19992 case DW_OP_GNU_push_tls_address:
19993 /* The top of the stack has the offset from the beginning
19994 of the thread control block at which the variable is located. */
19995 /* Nothing should follow this operator, so the top of stack would
19997 /* This is valid for partial global symbols, but the variable's
19998 address will be bogus in the psymtab. Make it always at least
19999 non-zero to not look as a variable garbage collected by linker
20000 which have DW_OP_addr 0. */
20002 dwarf2_complex_location_expr_complaint ();
20006 case DW_OP_GNU_uninit:
20009 case DW_OP_GNU_addr_index:
20010 case DW_OP_GNU_const_index:
20011 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
20018 const char *name = get_DW_OP_name (op);
20021 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
20024 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
20028 return (stack[stacki]);
20031 /* Enforce maximum stack depth of SIZE-1 to avoid writing
20032 outside of the allocated space. Also enforce minimum>0. */
20033 if (stacki >= ARRAY_SIZE (stack) - 1)
20035 complaint (&symfile_complaints,
20036 _("location description stack overflow"));
20042 complaint (&symfile_complaints,
20043 _("location description stack underflow"));
20047 return (stack[stacki]);
20050 /* memory allocation interface */
20052 static struct dwarf_block *
20053 dwarf_alloc_block (struct dwarf2_cu *cu)
20055 struct dwarf_block *blk;
20057 blk = (struct dwarf_block *)
20058 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
20062 static struct die_info *
20063 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
20065 struct die_info *die;
20066 size_t size = sizeof (struct die_info);
20069 size += (num_attrs - 1) * sizeof (struct attribute);
20071 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
20072 memset (die, 0, sizeof (struct die_info));
20077 /* Macro support. */
20079 /* Return file name relative to the compilation directory of file number I in
20080 *LH's file name table. The result is allocated using xmalloc; the caller is
20081 responsible for freeing it. */
20084 file_file_name (int file, struct line_header *lh)
20086 /* Is the file number a valid index into the line header's file name
20087 table? Remember that file numbers start with one, not zero. */
20088 if (1 <= file && file <= lh->num_file_names)
20090 struct file_entry *fe = &lh->file_names[file - 1];
20092 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
20093 return xstrdup (fe->name);
20094 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
20099 /* The compiler produced a bogus file number. We can at least
20100 record the macro definitions made in the file, even if we
20101 won't be able to find the file by name. */
20102 char fake_name[80];
20104 xsnprintf (fake_name, sizeof (fake_name),
20105 "<bad macro file number %d>", file);
20107 complaint (&symfile_complaints,
20108 _("bad file number in macro information (%d)"),
20111 return xstrdup (fake_name);
20115 /* Return the full name of file number I in *LH's file name table.
20116 Use COMP_DIR as the name of the current directory of the
20117 compilation. The result is allocated using xmalloc; the caller is
20118 responsible for freeing it. */
20120 file_full_name (int file, struct line_header *lh, const char *comp_dir)
20122 /* Is the file number a valid index into the line header's file name
20123 table? Remember that file numbers start with one, not zero. */
20124 if (1 <= file && file <= lh->num_file_names)
20126 char *relative = file_file_name (file, lh);
20128 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
20130 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
20133 return file_file_name (file, lh);
20137 static struct macro_source_file *
20138 macro_start_file (int file, int line,
20139 struct macro_source_file *current_file,
20140 const char *comp_dir,
20141 struct line_header *lh, struct objfile *objfile)
20143 /* File name relative to the compilation directory of this source file. */
20144 char *file_name = file_file_name (file, lh);
20146 if (! current_file)
20148 /* Note: We don't create a macro table for this compilation unit
20149 at all until we actually get a filename. */
20150 struct macro_table *macro_table = get_macro_table (objfile, comp_dir);
20152 /* If we have no current file, then this must be the start_file
20153 directive for the compilation unit's main source file. */
20154 current_file = macro_set_main (macro_table, file_name);
20155 macro_define_special (macro_table);
20158 current_file = macro_include (current_file, line, file_name);
20162 return current_file;
20166 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
20167 followed by a null byte. */
20169 copy_string (const char *buf, int len)
20171 char *s = xmalloc (len + 1);
20173 memcpy (s, buf, len);
20179 static const char *
20180 consume_improper_spaces (const char *p, const char *body)
20184 complaint (&symfile_complaints,
20185 _("macro definition contains spaces "
20186 "in formal argument list:\n`%s'"),
20198 parse_macro_definition (struct macro_source_file *file, int line,
20203 /* The body string takes one of two forms. For object-like macro
20204 definitions, it should be:
20206 <macro name> " " <definition>
20208 For function-like macro definitions, it should be:
20210 <macro name> "() " <definition>
20212 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
20214 Spaces may appear only where explicitly indicated, and in the
20217 The Dwarf 2 spec says that an object-like macro's name is always
20218 followed by a space, but versions of GCC around March 2002 omit
20219 the space when the macro's definition is the empty string.
20221 The Dwarf 2 spec says that there should be no spaces between the
20222 formal arguments in a function-like macro's formal argument list,
20223 but versions of GCC around March 2002 include spaces after the
20227 /* Find the extent of the macro name. The macro name is terminated
20228 by either a space or null character (for an object-like macro) or
20229 an opening paren (for a function-like macro). */
20230 for (p = body; *p; p++)
20231 if (*p == ' ' || *p == '(')
20234 if (*p == ' ' || *p == '\0')
20236 /* It's an object-like macro. */
20237 int name_len = p - body;
20238 char *name = copy_string (body, name_len);
20239 const char *replacement;
20242 replacement = body + name_len + 1;
20245 dwarf2_macro_malformed_definition_complaint (body);
20246 replacement = body + name_len;
20249 macro_define_object (file, line, name, replacement);
20253 else if (*p == '(')
20255 /* It's a function-like macro. */
20256 char *name = copy_string (body, p - body);
20259 char **argv = xmalloc (argv_size * sizeof (*argv));
20263 p = consume_improper_spaces (p, body);
20265 /* Parse the formal argument list. */
20266 while (*p && *p != ')')
20268 /* Find the extent of the current argument name. */
20269 const char *arg_start = p;
20271 while (*p && *p != ',' && *p != ')' && *p != ' ')
20274 if (! *p || p == arg_start)
20275 dwarf2_macro_malformed_definition_complaint (body);
20278 /* Make sure argv has room for the new argument. */
20279 if (argc >= argv_size)
20282 argv = xrealloc (argv, argv_size * sizeof (*argv));
20285 argv[argc++] = copy_string (arg_start, p - arg_start);
20288 p = consume_improper_spaces (p, body);
20290 /* Consume the comma, if present. */
20295 p = consume_improper_spaces (p, body);
20304 /* Perfectly formed definition, no complaints. */
20305 macro_define_function (file, line, name,
20306 argc, (const char **) argv,
20308 else if (*p == '\0')
20310 /* Complain, but do define it. */
20311 dwarf2_macro_malformed_definition_complaint (body);
20312 macro_define_function (file, line, name,
20313 argc, (const char **) argv,
20317 /* Just complain. */
20318 dwarf2_macro_malformed_definition_complaint (body);
20321 /* Just complain. */
20322 dwarf2_macro_malformed_definition_complaint (body);
20328 for (i = 0; i < argc; i++)
20334 dwarf2_macro_malformed_definition_complaint (body);
20337 /* Skip some bytes from BYTES according to the form given in FORM.
20338 Returns the new pointer. */
20340 static const gdb_byte *
20341 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
20342 enum dwarf_form form,
20343 unsigned int offset_size,
20344 struct dwarf2_section_info *section)
20346 unsigned int bytes_read;
20350 case DW_FORM_data1:
20355 case DW_FORM_data2:
20359 case DW_FORM_data4:
20363 case DW_FORM_data8:
20367 case DW_FORM_string:
20368 read_direct_string (abfd, bytes, &bytes_read);
20369 bytes += bytes_read;
20372 case DW_FORM_sec_offset:
20374 case DW_FORM_GNU_strp_alt:
20375 bytes += offset_size;
20378 case DW_FORM_block:
20379 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
20380 bytes += bytes_read;
20383 case DW_FORM_block1:
20384 bytes += 1 + read_1_byte (abfd, bytes);
20386 case DW_FORM_block2:
20387 bytes += 2 + read_2_bytes (abfd, bytes);
20389 case DW_FORM_block4:
20390 bytes += 4 + read_4_bytes (abfd, bytes);
20393 case DW_FORM_sdata:
20394 case DW_FORM_udata:
20395 case DW_FORM_GNU_addr_index:
20396 case DW_FORM_GNU_str_index:
20397 bytes = gdb_skip_leb128 (bytes, buffer_end);
20400 dwarf2_section_buffer_overflow_complaint (section);
20408 complaint (&symfile_complaints,
20409 _("invalid form 0x%x in `%s'"),
20410 form, get_section_name (section));
20418 /* A helper for dwarf_decode_macros that handles skipping an unknown
20419 opcode. Returns an updated pointer to the macro data buffer; or,
20420 on error, issues a complaint and returns NULL. */
20422 static const gdb_byte *
20423 skip_unknown_opcode (unsigned int opcode,
20424 const gdb_byte **opcode_definitions,
20425 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20427 unsigned int offset_size,
20428 struct dwarf2_section_info *section)
20430 unsigned int bytes_read, i;
20432 const gdb_byte *defn;
20434 if (opcode_definitions[opcode] == NULL)
20436 complaint (&symfile_complaints,
20437 _("unrecognized DW_MACFINO opcode 0x%x"),
20442 defn = opcode_definitions[opcode];
20443 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
20444 defn += bytes_read;
20446 for (i = 0; i < arg; ++i)
20448 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
20450 if (mac_ptr == NULL)
20452 /* skip_form_bytes already issued the complaint. */
20460 /* A helper function which parses the header of a macro section.
20461 If the macro section is the extended (for now called "GNU") type,
20462 then this updates *OFFSET_SIZE. Returns a pointer to just after
20463 the header, or issues a complaint and returns NULL on error. */
20465 static const gdb_byte *
20466 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
20468 const gdb_byte *mac_ptr,
20469 unsigned int *offset_size,
20470 int section_is_gnu)
20472 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
20474 if (section_is_gnu)
20476 unsigned int version, flags;
20478 version = read_2_bytes (abfd, mac_ptr);
20481 complaint (&symfile_complaints,
20482 _("unrecognized version `%d' in .debug_macro section"),
20488 flags = read_1_byte (abfd, mac_ptr);
20490 *offset_size = (flags & 1) ? 8 : 4;
20492 if ((flags & 2) != 0)
20493 /* We don't need the line table offset. */
20494 mac_ptr += *offset_size;
20496 /* Vendor opcode descriptions. */
20497 if ((flags & 4) != 0)
20499 unsigned int i, count;
20501 count = read_1_byte (abfd, mac_ptr);
20503 for (i = 0; i < count; ++i)
20505 unsigned int opcode, bytes_read;
20508 opcode = read_1_byte (abfd, mac_ptr);
20510 opcode_definitions[opcode] = mac_ptr;
20511 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20512 mac_ptr += bytes_read;
20521 /* A helper for dwarf_decode_macros that handles the GNU extensions,
20522 including DW_MACRO_GNU_transparent_include. */
20525 dwarf_decode_macro_bytes (bfd *abfd,
20526 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20527 struct macro_source_file *current_file,
20528 struct line_header *lh, const char *comp_dir,
20529 struct dwarf2_section_info *section,
20530 int section_is_gnu, int section_is_dwz,
20531 unsigned int offset_size,
20532 struct objfile *objfile,
20533 htab_t include_hash)
20535 enum dwarf_macro_record_type macinfo_type;
20536 int at_commandline;
20537 const gdb_byte *opcode_definitions[256];
20539 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20540 &offset_size, section_is_gnu);
20541 if (mac_ptr == NULL)
20543 /* We already issued a complaint. */
20547 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
20548 GDB is still reading the definitions from command line. First
20549 DW_MACINFO_start_file will need to be ignored as it was already executed
20550 to create CURRENT_FILE for the main source holding also the command line
20551 definitions. On first met DW_MACINFO_start_file this flag is reset to
20552 normally execute all the remaining DW_MACINFO_start_file macinfos. */
20554 at_commandline = 1;
20558 /* Do we at least have room for a macinfo type byte? */
20559 if (mac_ptr >= mac_end)
20561 dwarf2_section_buffer_overflow_complaint (section);
20565 macinfo_type = read_1_byte (abfd, mac_ptr);
20568 /* Note that we rely on the fact that the corresponding GNU and
20569 DWARF constants are the same. */
20570 switch (macinfo_type)
20572 /* A zero macinfo type indicates the end of the macro
20577 case DW_MACRO_GNU_define:
20578 case DW_MACRO_GNU_undef:
20579 case DW_MACRO_GNU_define_indirect:
20580 case DW_MACRO_GNU_undef_indirect:
20581 case DW_MACRO_GNU_define_indirect_alt:
20582 case DW_MACRO_GNU_undef_indirect_alt:
20584 unsigned int bytes_read;
20589 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20590 mac_ptr += bytes_read;
20592 if (macinfo_type == DW_MACRO_GNU_define
20593 || macinfo_type == DW_MACRO_GNU_undef)
20595 body = read_direct_string (abfd, mac_ptr, &bytes_read);
20596 mac_ptr += bytes_read;
20600 LONGEST str_offset;
20602 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
20603 mac_ptr += offset_size;
20605 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
20606 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
20609 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20611 body = read_indirect_string_from_dwz (dwz, str_offset);
20614 body = read_indirect_string_at_offset (abfd, str_offset);
20617 is_define = (macinfo_type == DW_MACRO_GNU_define
20618 || macinfo_type == DW_MACRO_GNU_define_indirect
20619 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
20620 if (! current_file)
20622 /* DWARF violation as no main source is present. */
20623 complaint (&symfile_complaints,
20624 _("debug info with no main source gives macro %s "
20626 is_define ? _("definition") : _("undefinition"),
20630 if ((line == 0 && !at_commandline)
20631 || (line != 0 && at_commandline))
20632 complaint (&symfile_complaints,
20633 _("debug info gives %s macro %s with %s line %d: %s"),
20634 at_commandline ? _("command-line") : _("in-file"),
20635 is_define ? _("definition") : _("undefinition"),
20636 line == 0 ? _("zero") : _("non-zero"), line, body);
20639 parse_macro_definition (current_file, line, body);
20642 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
20643 || macinfo_type == DW_MACRO_GNU_undef_indirect
20644 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
20645 macro_undef (current_file, line, body);
20650 case DW_MACRO_GNU_start_file:
20652 unsigned int bytes_read;
20655 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20656 mac_ptr += bytes_read;
20657 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20658 mac_ptr += bytes_read;
20660 if ((line == 0 && !at_commandline)
20661 || (line != 0 && at_commandline))
20662 complaint (&symfile_complaints,
20663 _("debug info gives source %d included "
20664 "from %s at %s line %d"),
20665 file, at_commandline ? _("command-line") : _("file"),
20666 line == 0 ? _("zero") : _("non-zero"), line);
20668 if (at_commandline)
20670 /* This DW_MACRO_GNU_start_file was executed in the
20672 at_commandline = 0;
20675 current_file = macro_start_file (file, line,
20676 current_file, comp_dir,
20681 case DW_MACRO_GNU_end_file:
20682 if (! current_file)
20683 complaint (&symfile_complaints,
20684 _("macro debug info has an unmatched "
20685 "`close_file' directive"));
20688 current_file = current_file->included_by;
20689 if (! current_file)
20691 enum dwarf_macro_record_type next_type;
20693 /* GCC circa March 2002 doesn't produce the zero
20694 type byte marking the end of the compilation
20695 unit. Complain if it's not there, but exit no
20698 /* Do we at least have room for a macinfo type byte? */
20699 if (mac_ptr >= mac_end)
20701 dwarf2_section_buffer_overflow_complaint (section);
20705 /* We don't increment mac_ptr here, so this is just
20707 next_type = read_1_byte (abfd, mac_ptr);
20708 if (next_type != 0)
20709 complaint (&symfile_complaints,
20710 _("no terminating 0-type entry for "
20711 "macros in `.debug_macinfo' section"));
20718 case DW_MACRO_GNU_transparent_include:
20719 case DW_MACRO_GNU_transparent_include_alt:
20723 bfd *include_bfd = abfd;
20724 struct dwarf2_section_info *include_section = section;
20725 struct dwarf2_section_info alt_section;
20726 const gdb_byte *include_mac_end = mac_end;
20727 int is_dwz = section_is_dwz;
20728 const gdb_byte *new_mac_ptr;
20730 offset = read_offset_1 (abfd, mac_ptr, offset_size);
20731 mac_ptr += offset_size;
20733 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
20735 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20737 dwarf2_read_section (dwarf2_per_objfile->objfile,
20740 include_section = &dwz->macro;
20741 include_bfd = get_section_bfd_owner (include_section);
20742 include_mac_end = dwz->macro.buffer + dwz->macro.size;
20746 new_mac_ptr = include_section->buffer + offset;
20747 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
20751 /* This has actually happened; see
20752 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
20753 complaint (&symfile_complaints,
20754 _("recursive DW_MACRO_GNU_transparent_include in "
20755 ".debug_macro section"));
20759 *slot = (void *) new_mac_ptr;
20761 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
20762 include_mac_end, current_file,
20764 section, section_is_gnu, is_dwz,
20765 offset_size, objfile, include_hash);
20767 htab_remove_elt (include_hash, (void *) new_mac_ptr);
20772 case DW_MACINFO_vendor_ext:
20773 if (!section_is_gnu)
20775 unsigned int bytes_read;
20778 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20779 mac_ptr += bytes_read;
20780 read_direct_string (abfd, mac_ptr, &bytes_read);
20781 mac_ptr += bytes_read;
20783 /* We don't recognize any vendor extensions. */
20789 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20790 mac_ptr, mac_end, abfd, offset_size,
20792 if (mac_ptr == NULL)
20796 } while (macinfo_type != 0);
20800 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
20801 const char *comp_dir, int section_is_gnu)
20803 struct objfile *objfile = dwarf2_per_objfile->objfile;
20804 struct line_header *lh = cu->line_header;
20806 const gdb_byte *mac_ptr, *mac_end;
20807 struct macro_source_file *current_file = 0;
20808 enum dwarf_macro_record_type macinfo_type;
20809 unsigned int offset_size = cu->header.offset_size;
20810 const gdb_byte *opcode_definitions[256];
20811 struct cleanup *cleanup;
20812 htab_t include_hash;
20814 struct dwarf2_section_info *section;
20815 const char *section_name;
20817 if (cu->dwo_unit != NULL)
20819 if (section_is_gnu)
20821 section = &cu->dwo_unit->dwo_file->sections.macro;
20822 section_name = ".debug_macro.dwo";
20826 section = &cu->dwo_unit->dwo_file->sections.macinfo;
20827 section_name = ".debug_macinfo.dwo";
20832 if (section_is_gnu)
20834 section = &dwarf2_per_objfile->macro;
20835 section_name = ".debug_macro";
20839 section = &dwarf2_per_objfile->macinfo;
20840 section_name = ".debug_macinfo";
20844 dwarf2_read_section (objfile, section);
20845 if (section->buffer == NULL)
20847 complaint (&symfile_complaints, _("missing %s section"), section_name);
20850 abfd = get_section_bfd_owner (section);
20852 /* First pass: Find the name of the base filename.
20853 This filename is needed in order to process all macros whose definition
20854 (or undefinition) comes from the command line. These macros are defined
20855 before the first DW_MACINFO_start_file entry, and yet still need to be
20856 associated to the base file.
20858 To determine the base file name, we scan the macro definitions until we
20859 reach the first DW_MACINFO_start_file entry. We then initialize
20860 CURRENT_FILE accordingly so that any macro definition found before the
20861 first DW_MACINFO_start_file can still be associated to the base file. */
20863 mac_ptr = section->buffer + offset;
20864 mac_end = section->buffer + section->size;
20866 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20867 &offset_size, section_is_gnu);
20868 if (mac_ptr == NULL)
20870 /* We already issued a complaint. */
20876 /* Do we at least have room for a macinfo type byte? */
20877 if (mac_ptr >= mac_end)
20879 /* Complaint is printed during the second pass as GDB will probably
20880 stop the first pass earlier upon finding
20881 DW_MACINFO_start_file. */
20885 macinfo_type = read_1_byte (abfd, mac_ptr);
20888 /* Note that we rely on the fact that the corresponding GNU and
20889 DWARF constants are the same. */
20890 switch (macinfo_type)
20892 /* A zero macinfo type indicates the end of the macro
20897 case DW_MACRO_GNU_define:
20898 case DW_MACRO_GNU_undef:
20899 /* Only skip the data by MAC_PTR. */
20901 unsigned int bytes_read;
20903 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20904 mac_ptr += bytes_read;
20905 read_direct_string (abfd, mac_ptr, &bytes_read);
20906 mac_ptr += bytes_read;
20910 case DW_MACRO_GNU_start_file:
20912 unsigned int bytes_read;
20915 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20916 mac_ptr += bytes_read;
20917 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20918 mac_ptr += bytes_read;
20920 current_file = macro_start_file (file, line, current_file,
20921 comp_dir, lh, objfile);
20925 case DW_MACRO_GNU_end_file:
20926 /* No data to skip by MAC_PTR. */
20929 case DW_MACRO_GNU_define_indirect:
20930 case DW_MACRO_GNU_undef_indirect:
20931 case DW_MACRO_GNU_define_indirect_alt:
20932 case DW_MACRO_GNU_undef_indirect_alt:
20934 unsigned int bytes_read;
20936 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20937 mac_ptr += bytes_read;
20938 mac_ptr += offset_size;
20942 case DW_MACRO_GNU_transparent_include:
20943 case DW_MACRO_GNU_transparent_include_alt:
20944 /* Note that, according to the spec, a transparent include
20945 chain cannot call DW_MACRO_GNU_start_file. So, we can just
20946 skip this opcode. */
20947 mac_ptr += offset_size;
20950 case DW_MACINFO_vendor_ext:
20951 /* Only skip the data by MAC_PTR. */
20952 if (!section_is_gnu)
20954 unsigned int bytes_read;
20956 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20957 mac_ptr += bytes_read;
20958 read_direct_string (abfd, mac_ptr, &bytes_read);
20959 mac_ptr += bytes_read;
20964 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20965 mac_ptr, mac_end, abfd, offset_size,
20967 if (mac_ptr == NULL)
20971 } while (macinfo_type != 0 && current_file == NULL);
20973 /* Second pass: Process all entries.
20975 Use the AT_COMMAND_LINE flag to determine whether we are still processing
20976 command-line macro definitions/undefinitions. This flag is unset when we
20977 reach the first DW_MACINFO_start_file entry. */
20979 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
20980 NULL, xcalloc, xfree);
20981 cleanup = make_cleanup_htab_delete (include_hash);
20982 mac_ptr = section->buffer + offset;
20983 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
20984 *slot = (void *) mac_ptr;
20985 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
20986 current_file, lh, comp_dir, section,
20988 offset_size, objfile, include_hash);
20989 do_cleanups (cleanup);
20992 /* Check if the attribute's form is a DW_FORM_block*
20993 if so return true else false. */
20996 attr_form_is_block (const struct attribute *attr)
20998 return (attr == NULL ? 0 :
20999 attr->form == DW_FORM_block1
21000 || attr->form == DW_FORM_block2
21001 || attr->form == DW_FORM_block4
21002 || attr->form == DW_FORM_block
21003 || attr->form == DW_FORM_exprloc);
21006 /* Return non-zero if ATTR's value is a section offset --- classes
21007 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
21008 You may use DW_UNSND (attr) to retrieve such offsets.
21010 Section 7.5.4, "Attribute Encodings", explains that no attribute
21011 may have a value that belongs to more than one of these classes; it
21012 would be ambiguous if we did, because we use the same forms for all
21016 attr_form_is_section_offset (const struct attribute *attr)
21018 return (attr->form == DW_FORM_data4
21019 || attr->form == DW_FORM_data8
21020 || attr->form == DW_FORM_sec_offset);
21023 /* Return non-zero if ATTR's value falls in the 'constant' class, or
21024 zero otherwise. When this function returns true, you can apply
21025 dwarf2_get_attr_constant_value to it.
21027 However, note that for some attributes you must check
21028 attr_form_is_section_offset before using this test. DW_FORM_data4
21029 and DW_FORM_data8 are members of both the constant class, and of
21030 the classes that contain offsets into other debug sections
21031 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
21032 that, if an attribute's can be either a constant or one of the
21033 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
21034 taken as section offsets, not constants. */
21037 attr_form_is_constant (const struct attribute *attr)
21039 switch (attr->form)
21041 case DW_FORM_sdata:
21042 case DW_FORM_udata:
21043 case DW_FORM_data1:
21044 case DW_FORM_data2:
21045 case DW_FORM_data4:
21046 case DW_FORM_data8:
21054 /* DW_ADDR is always stored already as sect_offset; despite for the forms
21055 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
21058 attr_form_is_ref (const struct attribute *attr)
21060 switch (attr->form)
21062 case DW_FORM_ref_addr:
21067 case DW_FORM_ref_udata:
21068 case DW_FORM_GNU_ref_alt:
21075 /* Return the .debug_loc section to use for CU.
21076 For DWO files use .debug_loc.dwo. */
21078 static struct dwarf2_section_info *
21079 cu_debug_loc_section (struct dwarf2_cu *cu)
21082 return &cu->dwo_unit->dwo_file->sections.loc;
21083 return &dwarf2_per_objfile->loc;
21086 /* A helper function that fills in a dwarf2_loclist_baton. */
21089 fill_in_loclist_baton (struct dwarf2_cu *cu,
21090 struct dwarf2_loclist_baton *baton,
21091 const struct attribute *attr)
21093 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21095 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
21097 baton->per_cu = cu->per_cu;
21098 gdb_assert (baton->per_cu);
21099 /* We don't know how long the location list is, but make sure we
21100 don't run off the edge of the section. */
21101 baton->size = section->size - DW_UNSND (attr);
21102 baton->data = section->buffer + DW_UNSND (attr);
21103 baton->base_address = cu->base_address;
21104 baton->from_dwo = cu->dwo_unit != NULL;
21108 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
21109 struct dwarf2_cu *cu, int is_block)
21111 struct objfile *objfile = dwarf2_per_objfile->objfile;
21112 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21114 if (attr_form_is_section_offset (attr)
21115 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
21116 the section. If so, fall through to the complaint in the
21118 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
21120 struct dwarf2_loclist_baton *baton;
21122 baton = obstack_alloc (&objfile->objfile_obstack,
21123 sizeof (struct dwarf2_loclist_baton));
21125 fill_in_loclist_baton (cu, baton, attr);
21127 if (cu->base_known == 0)
21128 complaint (&symfile_complaints,
21129 _("Location list used without "
21130 "specifying the CU base address."));
21132 SYMBOL_ACLASS_INDEX (sym) = (is_block
21133 ? dwarf2_loclist_block_index
21134 : dwarf2_loclist_index);
21135 SYMBOL_LOCATION_BATON (sym) = baton;
21139 struct dwarf2_locexpr_baton *baton;
21141 baton = obstack_alloc (&objfile->objfile_obstack,
21142 sizeof (struct dwarf2_locexpr_baton));
21143 baton->per_cu = cu->per_cu;
21144 gdb_assert (baton->per_cu);
21146 if (attr_form_is_block (attr))
21148 /* Note that we're just copying the block's data pointer
21149 here, not the actual data. We're still pointing into the
21150 info_buffer for SYM's objfile; right now we never release
21151 that buffer, but when we do clean up properly this may
21153 baton->size = DW_BLOCK (attr)->size;
21154 baton->data = DW_BLOCK (attr)->data;
21158 dwarf2_invalid_attrib_class_complaint ("location description",
21159 SYMBOL_NATURAL_NAME (sym));
21163 SYMBOL_ACLASS_INDEX (sym) = (is_block
21164 ? dwarf2_locexpr_block_index
21165 : dwarf2_locexpr_index);
21166 SYMBOL_LOCATION_BATON (sym) = baton;
21170 /* Return the OBJFILE associated with the compilation unit CU. If CU
21171 came from a separate debuginfo file, then the master objfile is
21175 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
21177 struct objfile *objfile = per_cu->objfile;
21179 /* Return the master objfile, so that we can report and look up the
21180 correct file containing this variable. */
21181 if (objfile->separate_debug_objfile_backlink)
21182 objfile = objfile->separate_debug_objfile_backlink;
21187 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
21188 (CU_HEADERP is unused in such case) or prepare a temporary copy at
21189 CU_HEADERP first. */
21191 static const struct comp_unit_head *
21192 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
21193 struct dwarf2_per_cu_data *per_cu)
21195 const gdb_byte *info_ptr;
21198 return &per_cu->cu->header;
21200 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
21202 memset (cu_headerp, 0, sizeof (*cu_headerp));
21203 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
21208 /* Return the address size given in the compilation unit header for CU. */
21211 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
21213 struct comp_unit_head cu_header_local;
21214 const struct comp_unit_head *cu_headerp;
21216 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21218 return cu_headerp->addr_size;
21221 /* Return the offset size given in the compilation unit header for CU. */
21224 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
21226 struct comp_unit_head cu_header_local;
21227 const struct comp_unit_head *cu_headerp;
21229 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21231 return cu_headerp->offset_size;
21234 /* See its dwarf2loc.h declaration. */
21237 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
21239 struct comp_unit_head cu_header_local;
21240 const struct comp_unit_head *cu_headerp;
21242 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21244 if (cu_headerp->version == 2)
21245 return cu_headerp->addr_size;
21247 return cu_headerp->offset_size;
21250 /* Return the text offset of the CU. The returned offset comes from
21251 this CU's objfile. If this objfile came from a separate debuginfo
21252 file, then the offset may be different from the corresponding
21253 offset in the parent objfile. */
21256 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
21258 struct objfile *objfile = per_cu->objfile;
21260 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21263 /* Locate the .debug_info compilation unit from CU's objfile which contains
21264 the DIE at OFFSET. Raises an error on failure. */
21266 static struct dwarf2_per_cu_data *
21267 dwarf2_find_containing_comp_unit (sect_offset offset,
21268 unsigned int offset_in_dwz,
21269 struct objfile *objfile)
21271 struct dwarf2_per_cu_data *this_cu;
21273 const sect_offset *cu_off;
21276 high = dwarf2_per_objfile->n_comp_units - 1;
21279 struct dwarf2_per_cu_data *mid_cu;
21280 int mid = low + (high - low) / 2;
21282 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
21283 cu_off = &mid_cu->offset;
21284 if (mid_cu->is_dwz > offset_in_dwz
21285 || (mid_cu->is_dwz == offset_in_dwz
21286 && cu_off->sect_off >= offset.sect_off))
21291 gdb_assert (low == high);
21292 this_cu = dwarf2_per_objfile->all_comp_units[low];
21293 cu_off = &this_cu->offset;
21294 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
21296 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
21297 error (_("Dwarf Error: could not find partial DIE containing "
21298 "offset 0x%lx [in module %s]"),
21299 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
21301 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
21302 <= offset.sect_off);
21303 return dwarf2_per_objfile->all_comp_units[low-1];
21307 this_cu = dwarf2_per_objfile->all_comp_units[low];
21308 if (low == dwarf2_per_objfile->n_comp_units - 1
21309 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
21310 error (_("invalid dwarf2 offset %u"), offset.sect_off);
21311 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
21316 /* Initialize dwarf2_cu CU, owned by PER_CU. */
21319 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
21321 memset (cu, 0, sizeof (*cu));
21323 cu->per_cu = per_cu;
21324 cu->objfile = per_cu->objfile;
21325 obstack_init (&cu->comp_unit_obstack);
21328 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
21331 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
21332 enum language pretend_language)
21334 struct attribute *attr;
21336 /* Set the language we're debugging. */
21337 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
21339 set_cu_language (DW_UNSND (attr), cu);
21342 cu->language = pretend_language;
21343 cu->language_defn = language_def (cu->language);
21346 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
21348 cu->producer = DW_STRING (attr);
21351 /* Release one cached compilation unit, CU. We unlink it from the tree
21352 of compilation units, but we don't remove it from the read_in_chain;
21353 the caller is responsible for that.
21354 NOTE: DATA is a void * because this function is also used as a
21355 cleanup routine. */
21358 free_heap_comp_unit (void *data)
21360 struct dwarf2_cu *cu = data;
21362 gdb_assert (cu->per_cu != NULL);
21363 cu->per_cu->cu = NULL;
21366 obstack_free (&cu->comp_unit_obstack, NULL);
21371 /* This cleanup function is passed the address of a dwarf2_cu on the stack
21372 when we're finished with it. We can't free the pointer itself, but be
21373 sure to unlink it from the cache. Also release any associated storage. */
21376 free_stack_comp_unit (void *data)
21378 struct dwarf2_cu *cu = data;
21380 gdb_assert (cu->per_cu != NULL);
21381 cu->per_cu->cu = NULL;
21384 obstack_free (&cu->comp_unit_obstack, NULL);
21385 cu->partial_dies = NULL;
21388 /* Free all cached compilation units. */
21391 free_cached_comp_units (void *data)
21393 struct dwarf2_per_cu_data *per_cu, **last_chain;
21395 per_cu = dwarf2_per_objfile->read_in_chain;
21396 last_chain = &dwarf2_per_objfile->read_in_chain;
21397 while (per_cu != NULL)
21399 struct dwarf2_per_cu_data *next_cu;
21401 next_cu = per_cu->cu->read_in_chain;
21403 free_heap_comp_unit (per_cu->cu);
21404 *last_chain = next_cu;
21410 /* Increase the age counter on each cached compilation unit, and free
21411 any that are too old. */
21414 age_cached_comp_units (void)
21416 struct dwarf2_per_cu_data *per_cu, **last_chain;
21418 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
21419 per_cu = dwarf2_per_objfile->read_in_chain;
21420 while (per_cu != NULL)
21422 per_cu->cu->last_used ++;
21423 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
21424 dwarf2_mark (per_cu->cu);
21425 per_cu = per_cu->cu->read_in_chain;
21428 per_cu = dwarf2_per_objfile->read_in_chain;
21429 last_chain = &dwarf2_per_objfile->read_in_chain;
21430 while (per_cu != NULL)
21432 struct dwarf2_per_cu_data *next_cu;
21434 next_cu = per_cu->cu->read_in_chain;
21436 if (!per_cu->cu->mark)
21438 free_heap_comp_unit (per_cu->cu);
21439 *last_chain = next_cu;
21442 last_chain = &per_cu->cu->read_in_chain;
21448 /* Remove a single compilation unit from the cache. */
21451 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
21453 struct dwarf2_per_cu_data *per_cu, **last_chain;
21455 per_cu = dwarf2_per_objfile->read_in_chain;
21456 last_chain = &dwarf2_per_objfile->read_in_chain;
21457 while (per_cu != NULL)
21459 struct dwarf2_per_cu_data *next_cu;
21461 next_cu = per_cu->cu->read_in_chain;
21463 if (per_cu == target_per_cu)
21465 free_heap_comp_unit (per_cu->cu);
21467 *last_chain = next_cu;
21471 last_chain = &per_cu->cu->read_in_chain;
21477 /* Release all extra memory associated with OBJFILE. */
21480 dwarf2_free_objfile (struct objfile *objfile)
21482 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21484 if (dwarf2_per_objfile == NULL)
21487 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
21488 free_cached_comp_units (NULL);
21490 if (dwarf2_per_objfile->quick_file_names_table)
21491 htab_delete (dwarf2_per_objfile->quick_file_names_table);
21493 /* Everything else should be on the objfile obstack. */
21496 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
21497 We store these in a hash table separate from the DIEs, and preserve them
21498 when the DIEs are flushed out of cache.
21500 The CU "per_cu" pointer is needed because offset alone is not enough to
21501 uniquely identify the type. A file may have multiple .debug_types sections,
21502 or the type may come from a DWO file. Furthermore, while it's more logical
21503 to use per_cu->section+offset, with Fission the section with the data is in
21504 the DWO file but we don't know that section at the point we need it.
21505 We have to use something in dwarf2_per_cu_data (or the pointer to it)
21506 because we can enter the lookup routine, get_die_type_at_offset, from
21507 outside this file, and thus won't necessarily have PER_CU->cu.
21508 Fortunately, PER_CU is stable for the life of the objfile. */
21510 struct dwarf2_per_cu_offset_and_type
21512 const struct dwarf2_per_cu_data *per_cu;
21513 sect_offset offset;
21517 /* Hash function for a dwarf2_per_cu_offset_and_type. */
21520 per_cu_offset_and_type_hash (const void *item)
21522 const struct dwarf2_per_cu_offset_and_type *ofs = item;
21524 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
21527 /* Equality function for a dwarf2_per_cu_offset_and_type. */
21530 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
21532 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
21533 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
21535 return (ofs_lhs->per_cu == ofs_rhs->per_cu
21536 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
21539 /* Set the type associated with DIE to TYPE. Save it in CU's hash
21540 table if necessary. For convenience, return TYPE.
21542 The DIEs reading must have careful ordering to:
21543 * Not cause infite loops trying to read in DIEs as a prerequisite for
21544 reading current DIE.
21545 * Not trying to dereference contents of still incompletely read in types
21546 while reading in other DIEs.
21547 * Enable referencing still incompletely read in types just by a pointer to
21548 the type without accessing its fields.
21550 Therefore caller should follow these rules:
21551 * Try to fetch any prerequisite types we may need to build this DIE type
21552 before building the type and calling set_die_type.
21553 * After building type call set_die_type for current DIE as soon as
21554 possible before fetching more types to complete the current type.
21555 * Make the type as complete as possible before fetching more types. */
21557 static struct type *
21558 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
21560 struct dwarf2_per_cu_offset_and_type **slot, ofs;
21561 struct objfile *objfile = cu->objfile;
21563 /* For Ada types, make sure that the gnat-specific data is always
21564 initialized (if not already set). There are a few types where
21565 we should not be doing so, because the type-specific area is
21566 already used to hold some other piece of info (eg: TYPE_CODE_FLT
21567 where the type-specific area is used to store the floatformat).
21568 But this is not a problem, because the gnat-specific information
21569 is actually not needed for these types. */
21570 if (need_gnat_info (cu)
21571 && TYPE_CODE (type) != TYPE_CODE_FUNC
21572 && TYPE_CODE (type) != TYPE_CODE_FLT
21573 && !HAVE_GNAT_AUX_INFO (type))
21574 INIT_GNAT_SPECIFIC (type);
21576 if (dwarf2_per_objfile->die_type_hash == NULL)
21578 dwarf2_per_objfile->die_type_hash =
21579 htab_create_alloc_ex (127,
21580 per_cu_offset_and_type_hash,
21581 per_cu_offset_and_type_eq,
21583 &objfile->objfile_obstack,
21584 hashtab_obstack_allocate,
21585 dummy_obstack_deallocate);
21588 ofs.per_cu = cu->per_cu;
21589 ofs.offset = die->offset;
21591 slot = (struct dwarf2_per_cu_offset_and_type **)
21592 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
21594 complaint (&symfile_complaints,
21595 _("A problem internal to GDB: DIE 0x%x has type already set"),
21596 die->offset.sect_off);
21597 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
21602 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
21603 or return NULL if the die does not have a saved type. */
21605 static struct type *
21606 get_die_type_at_offset (sect_offset offset,
21607 struct dwarf2_per_cu_data *per_cu)
21609 struct dwarf2_per_cu_offset_and_type *slot, ofs;
21611 if (dwarf2_per_objfile->die_type_hash == NULL)
21614 ofs.per_cu = per_cu;
21615 ofs.offset = offset;
21616 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
21623 /* Look up the type for DIE in CU in die_type_hash,
21624 or return NULL if DIE does not have a saved type. */
21626 static struct type *
21627 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
21629 return get_die_type_at_offset (die->offset, cu->per_cu);
21632 /* Add a dependence relationship from CU to REF_PER_CU. */
21635 dwarf2_add_dependence (struct dwarf2_cu *cu,
21636 struct dwarf2_per_cu_data *ref_per_cu)
21640 if (cu->dependencies == NULL)
21642 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
21643 NULL, &cu->comp_unit_obstack,
21644 hashtab_obstack_allocate,
21645 dummy_obstack_deallocate);
21647 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
21649 *slot = ref_per_cu;
21652 /* Subroutine of dwarf2_mark to pass to htab_traverse.
21653 Set the mark field in every compilation unit in the
21654 cache that we must keep because we are keeping CU. */
21657 dwarf2_mark_helper (void **slot, void *data)
21659 struct dwarf2_per_cu_data *per_cu;
21661 per_cu = (struct dwarf2_per_cu_data *) *slot;
21663 /* cu->dependencies references may not yet have been ever read if QUIT aborts
21664 reading of the chain. As such dependencies remain valid it is not much
21665 useful to track and undo them during QUIT cleanups. */
21666 if (per_cu->cu == NULL)
21669 if (per_cu->cu->mark)
21671 per_cu->cu->mark = 1;
21673 if (per_cu->cu->dependencies != NULL)
21674 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
21679 /* Set the mark field in CU and in every other compilation unit in the
21680 cache that we must keep because we are keeping CU. */
21683 dwarf2_mark (struct dwarf2_cu *cu)
21688 if (cu->dependencies != NULL)
21689 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
21693 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
21697 per_cu->cu->mark = 0;
21698 per_cu = per_cu->cu->read_in_chain;
21702 /* Trivial hash function for partial_die_info: the hash value of a DIE
21703 is its offset in .debug_info for this objfile. */
21706 partial_die_hash (const void *item)
21708 const struct partial_die_info *part_die = item;
21710 return part_die->offset.sect_off;
21713 /* Trivial comparison function for partial_die_info structures: two DIEs
21714 are equal if they have the same offset. */
21717 partial_die_eq (const void *item_lhs, const void *item_rhs)
21719 const struct partial_die_info *part_die_lhs = item_lhs;
21720 const struct partial_die_info *part_die_rhs = item_rhs;
21722 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
21725 static struct cmd_list_element *set_dwarf2_cmdlist;
21726 static struct cmd_list_element *show_dwarf2_cmdlist;
21729 set_dwarf2_cmd (char *args, int from_tty)
21731 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
21735 show_dwarf2_cmd (char *args, int from_tty)
21737 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
21740 /* Free data associated with OBJFILE, if necessary. */
21743 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
21745 struct dwarf2_per_objfile *data = d;
21748 /* Make sure we don't accidentally use dwarf2_per_objfile while
21750 dwarf2_per_objfile = NULL;
21752 for (ix = 0; ix < data->n_comp_units; ++ix)
21753 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
21755 for (ix = 0; ix < data->n_type_units; ++ix)
21756 VEC_free (dwarf2_per_cu_ptr,
21757 data->all_type_units[ix]->per_cu.imported_symtabs);
21758 xfree (data->all_type_units);
21760 VEC_free (dwarf2_section_info_def, data->types);
21762 if (data->dwo_files)
21763 free_dwo_files (data->dwo_files, objfile);
21764 if (data->dwp_file)
21765 gdb_bfd_unref (data->dwp_file->dbfd);
21767 if (data->dwz_file && data->dwz_file->dwz_bfd)
21768 gdb_bfd_unref (data->dwz_file->dwz_bfd);
21772 /* The "save gdb-index" command. */
21774 /* The contents of the hash table we create when building the string
21776 struct strtab_entry
21778 offset_type offset;
21782 /* Hash function for a strtab_entry.
21784 Function is used only during write_hash_table so no index format backward
21785 compatibility is needed. */
21788 hash_strtab_entry (const void *e)
21790 const struct strtab_entry *entry = e;
21791 return mapped_index_string_hash (INT_MAX, entry->str);
21794 /* Equality function for a strtab_entry. */
21797 eq_strtab_entry (const void *a, const void *b)
21799 const struct strtab_entry *ea = a;
21800 const struct strtab_entry *eb = b;
21801 return !strcmp (ea->str, eb->str);
21804 /* Create a strtab_entry hash table. */
21807 create_strtab (void)
21809 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
21810 xfree, xcalloc, xfree);
21813 /* Add a string to the constant pool. Return the string's offset in
21817 add_string (htab_t table, struct obstack *cpool, const char *str)
21820 struct strtab_entry entry;
21821 struct strtab_entry *result;
21824 slot = htab_find_slot (table, &entry, INSERT);
21829 result = XNEW (struct strtab_entry);
21830 result->offset = obstack_object_size (cpool);
21832 obstack_grow_str0 (cpool, str);
21835 return result->offset;
21838 /* An entry in the symbol table. */
21839 struct symtab_index_entry
21841 /* The name of the symbol. */
21843 /* The offset of the name in the constant pool. */
21844 offset_type index_offset;
21845 /* A sorted vector of the indices of all the CUs that hold an object
21847 VEC (offset_type) *cu_indices;
21850 /* The symbol table. This is a power-of-2-sized hash table. */
21851 struct mapped_symtab
21853 offset_type n_elements;
21855 struct symtab_index_entry **data;
21858 /* Hash function for a symtab_index_entry. */
21861 hash_symtab_entry (const void *e)
21863 const struct symtab_index_entry *entry = e;
21864 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
21865 sizeof (offset_type) * VEC_length (offset_type,
21866 entry->cu_indices),
21870 /* Equality function for a symtab_index_entry. */
21873 eq_symtab_entry (const void *a, const void *b)
21875 const struct symtab_index_entry *ea = a;
21876 const struct symtab_index_entry *eb = b;
21877 int len = VEC_length (offset_type, ea->cu_indices);
21878 if (len != VEC_length (offset_type, eb->cu_indices))
21880 return !memcmp (VEC_address (offset_type, ea->cu_indices),
21881 VEC_address (offset_type, eb->cu_indices),
21882 sizeof (offset_type) * len);
21885 /* Destroy a symtab_index_entry. */
21888 delete_symtab_entry (void *p)
21890 struct symtab_index_entry *entry = p;
21891 VEC_free (offset_type, entry->cu_indices);
21895 /* Create a hash table holding symtab_index_entry objects. */
21898 create_symbol_hash_table (void)
21900 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
21901 delete_symtab_entry, xcalloc, xfree);
21904 /* Create a new mapped symtab object. */
21906 static struct mapped_symtab *
21907 create_mapped_symtab (void)
21909 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
21910 symtab->n_elements = 0;
21911 symtab->size = 1024;
21912 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21916 /* Destroy a mapped_symtab. */
21919 cleanup_mapped_symtab (void *p)
21921 struct mapped_symtab *symtab = p;
21922 /* The contents of the array are freed when the other hash table is
21924 xfree (symtab->data);
21928 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
21931 Function is used only during write_hash_table so no index format backward
21932 compatibility is needed. */
21934 static struct symtab_index_entry **
21935 find_slot (struct mapped_symtab *symtab, const char *name)
21937 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
21939 index = hash & (symtab->size - 1);
21940 step = ((hash * 17) & (symtab->size - 1)) | 1;
21944 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
21945 return &symtab->data[index];
21946 index = (index + step) & (symtab->size - 1);
21950 /* Expand SYMTAB's hash table. */
21953 hash_expand (struct mapped_symtab *symtab)
21955 offset_type old_size = symtab->size;
21957 struct symtab_index_entry **old_entries = symtab->data;
21960 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21962 for (i = 0; i < old_size; ++i)
21964 if (old_entries[i])
21966 struct symtab_index_entry **slot = find_slot (symtab,
21967 old_entries[i]->name);
21968 *slot = old_entries[i];
21972 xfree (old_entries);
21975 /* Add an entry to SYMTAB. NAME is the name of the symbol.
21976 CU_INDEX is the index of the CU in which the symbol appears.
21977 IS_STATIC is one if the symbol is static, otherwise zero (global). */
21980 add_index_entry (struct mapped_symtab *symtab, const char *name,
21981 int is_static, gdb_index_symbol_kind kind,
21982 offset_type cu_index)
21984 struct symtab_index_entry **slot;
21985 offset_type cu_index_and_attrs;
21987 ++symtab->n_elements;
21988 if (4 * symtab->n_elements / 3 >= symtab->size)
21989 hash_expand (symtab);
21991 slot = find_slot (symtab, name);
21994 *slot = XNEW (struct symtab_index_entry);
21995 (*slot)->name = name;
21996 /* index_offset is set later. */
21997 (*slot)->cu_indices = NULL;
22000 cu_index_and_attrs = 0;
22001 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
22002 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
22003 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
22005 /* We don't want to record an index value twice as we want to avoid the
22007 We process all global symbols and then all static symbols
22008 (which would allow us to avoid the duplication by only having to check
22009 the last entry pushed), but a symbol could have multiple kinds in one CU.
22010 To keep things simple we don't worry about the duplication here and
22011 sort and uniqufy the list after we've processed all symbols. */
22012 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
22015 /* qsort helper routine for uniquify_cu_indices. */
22018 offset_type_compare (const void *ap, const void *bp)
22020 offset_type a = *(offset_type *) ap;
22021 offset_type b = *(offset_type *) bp;
22023 return (a > b) - (b > a);
22026 /* Sort and remove duplicates of all symbols' cu_indices lists. */
22029 uniquify_cu_indices (struct mapped_symtab *symtab)
22033 for (i = 0; i < symtab->size; ++i)
22035 struct symtab_index_entry *entry = symtab->data[i];
22038 && entry->cu_indices != NULL)
22040 unsigned int next_to_insert, next_to_check;
22041 offset_type last_value;
22043 qsort (VEC_address (offset_type, entry->cu_indices),
22044 VEC_length (offset_type, entry->cu_indices),
22045 sizeof (offset_type), offset_type_compare);
22047 last_value = VEC_index (offset_type, entry->cu_indices, 0);
22048 next_to_insert = 1;
22049 for (next_to_check = 1;
22050 next_to_check < VEC_length (offset_type, entry->cu_indices);
22053 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
22056 last_value = VEC_index (offset_type, entry->cu_indices,
22058 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
22063 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
22068 /* Add a vector of indices to the constant pool. */
22071 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
22072 struct symtab_index_entry *entry)
22076 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
22079 offset_type len = VEC_length (offset_type, entry->cu_indices);
22080 offset_type val = MAYBE_SWAP (len);
22085 entry->index_offset = obstack_object_size (cpool);
22087 obstack_grow (cpool, &val, sizeof (val));
22089 VEC_iterate (offset_type, entry->cu_indices, i, iter);
22092 val = MAYBE_SWAP (iter);
22093 obstack_grow (cpool, &val, sizeof (val));
22098 struct symtab_index_entry *old_entry = *slot;
22099 entry->index_offset = old_entry->index_offset;
22102 return entry->index_offset;
22105 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
22106 constant pool entries going into the obstack CPOOL. */
22109 write_hash_table (struct mapped_symtab *symtab,
22110 struct obstack *output, struct obstack *cpool)
22113 htab_t symbol_hash_table;
22116 symbol_hash_table = create_symbol_hash_table ();
22117 str_table = create_strtab ();
22119 /* We add all the index vectors to the constant pool first, to
22120 ensure alignment is ok. */
22121 for (i = 0; i < symtab->size; ++i)
22123 if (symtab->data[i])
22124 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
22127 /* Now write out the hash table. */
22128 for (i = 0; i < symtab->size; ++i)
22130 offset_type str_off, vec_off;
22132 if (symtab->data[i])
22134 str_off = add_string (str_table, cpool, symtab->data[i]->name);
22135 vec_off = symtab->data[i]->index_offset;
22139 /* While 0 is a valid constant pool index, it is not valid
22140 to have 0 for both offsets. */
22145 str_off = MAYBE_SWAP (str_off);
22146 vec_off = MAYBE_SWAP (vec_off);
22148 obstack_grow (output, &str_off, sizeof (str_off));
22149 obstack_grow (output, &vec_off, sizeof (vec_off));
22152 htab_delete (str_table);
22153 htab_delete (symbol_hash_table);
22156 /* Struct to map psymtab to CU index in the index file. */
22157 struct psymtab_cu_index_map
22159 struct partial_symtab *psymtab;
22160 unsigned int cu_index;
22164 hash_psymtab_cu_index (const void *item)
22166 const struct psymtab_cu_index_map *map = item;
22168 return htab_hash_pointer (map->psymtab);
22172 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
22174 const struct psymtab_cu_index_map *lhs = item_lhs;
22175 const struct psymtab_cu_index_map *rhs = item_rhs;
22177 return lhs->psymtab == rhs->psymtab;
22180 /* Helper struct for building the address table. */
22181 struct addrmap_index_data
22183 struct objfile *objfile;
22184 struct obstack *addr_obstack;
22185 htab_t cu_index_htab;
22187 /* Non-zero if the previous_* fields are valid.
22188 We can't write an entry until we see the next entry (since it is only then
22189 that we know the end of the entry). */
22190 int previous_valid;
22191 /* Index of the CU in the table of all CUs in the index file. */
22192 unsigned int previous_cu_index;
22193 /* Start address of the CU. */
22194 CORE_ADDR previous_cu_start;
22197 /* Write an address entry to OBSTACK. */
22200 add_address_entry (struct objfile *objfile, struct obstack *obstack,
22201 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
22203 offset_type cu_index_to_write;
22205 CORE_ADDR baseaddr;
22207 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22209 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
22210 obstack_grow (obstack, addr, 8);
22211 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
22212 obstack_grow (obstack, addr, 8);
22213 cu_index_to_write = MAYBE_SWAP (cu_index);
22214 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
22217 /* Worker function for traversing an addrmap to build the address table. */
22220 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
22222 struct addrmap_index_data *data = datap;
22223 struct partial_symtab *pst = obj;
22225 if (data->previous_valid)
22226 add_address_entry (data->objfile, data->addr_obstack,
22227 data->previous_cu_start, start_addr,
22228 data->previous_cu_index);
22230 data->previous_cu_start = start_addr;
22233 struct psymtab_cu_index_map find_map, *map;
22234 find_map.psymtab = pst;
22235 map = htab_find (data->cu_index_htab, &find_map);
22236 gdb_assert (map != NULL);
22237 data->previous_cu_index = map->cu_index;
22238 data->previous_valid = 1;
22241 data->previous_valid = 0;
22246 /* Write OBJFILE's address map to OBSTACK.
22247 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
22248 in the index file. */
22251 write_address_map (struct objfile *objfile, struct obstack *obstack,
22252 htab_t cu_index_htab)
22254 struct addrmap_index_data addrmap_index_data;
22256 /* When writing the address table, we have to cope with the fact that
22257 the addrmap iterator only provides the start of a region; we have to
22258 wait until the next invocation to get the start of the next region. */
22260 addrmap_index_data.objfile = objfile;
22261 addrmap_index_data.addr_obstack = obstack;
22262 addrmap_index_data.cu_index_htab = cu_index_htab;
22263 addrmap_index_data.previous_valid = 0;
22265 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
22266 &addrmap_index_data);
22268 /* It's highly unlikely the last entry (end address = 0xff...ff)
22269 is valid, but we should still handle it.
22270 The end address is recorded as the start of the next region, but that
22271 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
22273 if (addrmap_index_data.previous_valid)
22274 add_address_entry (objfile, obstack,
22275 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
22276 addrmap_index_data.previous_cu_index);
22279 /* Return the symbol kind of PSYM. */
22281 static gdb_index_symbol_kind
22282 symbol_kind (struct partial_symbol *psym)
22284 domain_enum domain = PSYMBOL_DOMAIN (psym);
22285 enum address_class aclass = PSYMBOL_CLASS (psym);
22293 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
22295 return GDB_INDEX_SYMBOL_KIND_TYPE;
22297 case LOC_CONST_BYTES:
22298 case LOC_OPTIMIZED_OUT:
22300 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22302 /* Note: It's currently impossible to recognize psyms as enum values
22303 short of reading the type info. For now punt. */
22304 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22306 /* There are other LOC_FOO values that one might want to classify
22307 as variables, but dwarf2read.c doesn't currently use them. */
22308 return GDB_INDEX_SYMBOL_KIND_OTHER;
22310 case STRUCT_DOMAIN:
22311 return GDB_INDEX_SYMBOL_KIND_TYPE;
22313 return GDB_INDEX_SYMBOL_KIND_OTHER;
22317 /* Add a list of partial symbols to SYMTAB. */
22320 write_psymbols (struct mapped_symtab *symtab,
22322 struct partial_symbol **psymp,
22324 offset_type cu_index,
22327 for (; count-- > 0; ++psymp)
22329 struct partial_symbol *psym = *psymp;
22332 if (SYMBOL_LANGUAGE (psym) == language_ada)
22333 error (_("Ada is not currently supported by the index"));
22335 /* Only add a given psymbol once. */
22336 slot = htab_find_slot (psyms_seen, psym, INSERT);
22339 gdb_index_symbol_kind kind = symbol_kind (psym);
22342 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
22343 is_static, kind, cu_index);
22348 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
22349 exception if there is an error. */
22352 write_obstack (FILE *file, struct obstack *obstack)
22354 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
22356 != obstack_object_size (obstack))
22357 error (_("couldn't data write to file"));
22360 /* Unlink a file if the argument is not NULL. */
22363 unlink_if_set (void *p)
22365 char **filename = p;
22367 unlink (*filename);
22370 /* A helper struct used when iterating over debug_types. */
22371 struct signatured_type_index_data
22373 struct objfile *objfile;
22374 struct mapped_symtab *symtab;
22375 struct obstack *types_list;
22380 /* A helper function that writes a single signatured_type to an
22384 write_one_signatured_type (void **slot, void *d)
22386 struct signatured_type_index_data *info = d;
22387 struct signatured_type *entry = (struct signatured_type *) *slot;
22388 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
22391 write_psymbols (info->symtab,
22393 info->objfile->global_psymbols.list
22394 + psymtab->globals_offset,
22395 psymtab->n_global_syms, info->cu_index,
22397 write_psymbols (info->symtab,
22399 info->objfile->static_psymbols.list
22400 + psymtab->statics_offset,
22401 psymtab->n_static_syms, info->cu_index,
22404 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22405 entry->per_cu.offset.sect_off);
22406 obstack_grow (info->types_list, val, 8);
22407 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22408 entry->type_offset_in_tu.cu_off);
22409 obstack_grow (info->types_list, val, 8);
22410 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
22411 obstack_grow (info->types_list, val, 8);
22418 /* Recurse into all "included" dependencies and write their symbols as
22419 if they appeared in this psymtab. */
22422 recursively_write_psymbols (struct objfile *objfile,
22423 struct partial_symtab *psymtab,
22424 struct mapped_symtab *symtab,
22426 offset_type cu_index)
22430 for (i = 0; i < psymtab->number_of_dependencies; ++i)
22431 if (psymtab->dependencies[i]->user != NULL)
22432 recursively_write_psymbols (objfile, psymtab->dependencies[i],
22433 symtab, psyms_seen, cu_index);
22435 write_psymbols (symtab,
22437 objfile->global_psymbols.list + psymtab->globals_offset,
22438 psymtab->n_global_syms, cu_index,
22440 write_psymbols (symtab,
22442 objfile->static_psymbols.list + psymtab->statics_offset,
22443 psymtab->n_static_syms, cu_index,
22447 /* Create an index file for OBJFILE in the directory DIR. */
22450 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
22452 struct cleanup *cleanup;
22453 char *filename, *cleanup_filename;
22454 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
22455 struct obstack cu_list, types_cu_list;
22458 struct mapped_symtab *symtab;
22459 offset_type val, size_of_contents, total_len;
22462 htab_t cu_index_htab;
22463 struct psymtab_cu_index_map *psymtab_cu_index_map;
22465 if (dwarf2_per_objfile->using_index)
22466 error (_("Cannot use an index to create the index"));
22468 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
22469 error (_("Cannot make an index when the file has multiple .debug_types sections"));
22471 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
22474 if (stat (objfile_name (objfile), &st) < 0)
22475 perror_with_name (objfile_name (objfile));
22477 filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)),
22478 INDEX_SUFFIX, (char *) NULL);
22479 cleanup = make_cleanup (xfree, filename);
22481 out_file = gdb_fopen_cloexec (filename, "wb");
22483 error (_("Can't open `%s' for writing"), filename);
22485 cleanup_filename = filename;
22486 make_cleanup (unlink_if_set, &cleanup_filename);
22488 symtab = create_mapped_symtab ();
22489 make_cleanup (cleanup_mapped_symtab, symtab);
22491 obstack_init (&addr_obstack);
22492 make_cleanup_obstack_free (&addr_obstack);
22494 obstack_init (&cu_list);
22495 make_cleanup_obstack_free (&cu_list);
22497 obstack_init (&types_cu_list);
22498 make_cleanup_obstack_free (&types_cu_list);
22500 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
22501 NULL, xcalloc, xfree);
22502 make_cleanup_htab_delete (psyms_seen);
22504 /* While we're scanning CU's create a table that maps a psymtab pointer
22505 (which is what addrmap records) to its index (which is what is recorded
22506 in the index file). This will later be needed to write the address
22508 cu_index_htab = htab_create_alloc (100,
22509 hash_psymtab_cu_index,
22510 eq_psymtab_cu_index,
22511 NULL, xcalloc, xfree);
22512 make_cleanup_htab_delete (cu_index_htab);
22513 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
22514 xmalloc (sizeof (struct psymtab_cu_index_map)
22515 * dwarf2_per_objfile->n_comp_units);
22516 make_cleanup (xfree, psymtab_cu_index_map);
22518 /* The CU list is already sorted, so we don't need to do additional
22519 work here. Also, the debug_types entries do not appear in
22520 all_comp_units, but only in their own hash table. */
22521 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
22523 struct dwarf2_per_cu_data *per_cu
22524 = dwarf2_per_objfile->all_comp_units[i];
22525 struct partial_symtab *psymtab = per_cu->v.psymtab;
22527 struct psymtab_cu_index_map *map;
22530 /* CU of a shared file from 'dwz -m' may be unused by this main file.
22531 It may be referenced from a local scope but in such case it does not
22532 need to be present in .gdb_index. */
22533 if (psymtab == NULL)
22536 if (psymtab->user == NULL)
22537 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
22539 map = &psymtab_cu_index_map[i];
22540 map->psymtab = psymtab;
22542 slot = htab_find_slot (cu_index_htab, map, INSERT);
22543 gdb_assert (slot != NULL);
22544 gdb_assert (*slot == NULL);
22547 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22548 per_cu->offset.sect_off);
22549 obstack_grow (&cu_list, val, 8);
22550 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
22551 obstack_grow (&cu_list, val, 8);
22554 /* Dump the address map. */
22555 write_address_map (objfile, &addr_obstack, cu_index_htab);
22557 /* Write out the .debug_type entries, if any. */
22558 if (dwarf2_per_objfile->signatured_types)
22560 struct signatured_type_index_data sig_data;
22562 sig_data.objfile = objfile;
22563 sig_data.symtab = symtab;
22564 sig_data.types_list = &types_cu_list;
22565 sig_data.psyms_seen = psyms_seen;
22566 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
22567 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
22568 write_one_signatured_type, &sig_data);
22571 /* Now that we've processed all symbols we can shrink their cu_indices
22573 uniquify_cu_indices (symtab);
22575 obstack_init (&constant_pool);
22576 make_cleanup_obstack_free (&constant_pool);
22577 obstack_init (&symtab_obstack);
22578 make_cleanup_obstack_free (&symtab_obstack);
22579 write_hash_table (symtab, &symtab_obstack, &constant_pool);
22581 obstack_init (&contents);
22582 make_cleanup_obstack_free (&contents);
22583 size_of_contents = 6 * sizeof (offset_type);
22584 total_len = size_of_contents;
22586 /* The version number. */
22587 val = MAYBE_SWAP (8);
22588 obstack_grow (&contents, &val, sizeof (val));
22590 /* The offset of the CU list from the start of the file. */
22591 val = MAYBE_SWAP (total_len);
22592 obstack_grow (&contents, &val, sizeof (val));
22593 total_len += obstack_object_size (&cu_list);
22595 /* The offset of the types CU list from the start of the file. */
22596 val = MAYBE_SWAP (total_len);
22597 obstack_grow (&contents, &val, sizeof (val));
22598 total_len += obstack_object_size (&types_cu_list);
22600 /* The offset of the address table from the start of the file. */
22601 val = MAYBE_SWAP (total_len);
22602 obstack_grow (&contents, &val, sizeof (val));
22603 total_len += obstack_object_size (&addr_obstack);
22605 /* The offset of the symbol table from the start of the file. */
22606 val = MAYBE_SWAP (total_len);
22607 obstack_grow (&contents, &val, sizeof (val));
22608 total_len += obstack_object_size (&symtab_obstack);
22610 /* The offset of the constant pool from the start of the file. */
22611 val = MAYBE_SWAP (total_len);
22612 obstack_grow (&contents, &val, sizeof (val));
22613 total_len += obstack_object_size (&constant_pool);
22615 gdb_assert (obstack_object_size (&contents) == size_of_contents);
22617 write_obstack (out_file, &contents);
22618 write_obstack (out_file, &cu_list);
22619 write_obstack (out_file, &types_cu_list);
22620 write_obstack (out_file, &addr_obstack);
22621 write_obstack (out_file, &symtab_obstack);
22622 write_obstack (out_file, &constant_pool);
22626 /* We want to keep the file, so we set cleanup_filename to NULL
22627 here. See unlink_if_set. */
22628 cleanup_filename = NULL;
22630 do_cleanups (cleanup);
22633 /* Implementation of the `save gdb-index' command.
22635 Note that the file format used by this command is documented in the
22636 GDB manual. Any changes here must be documented there. */
22639 save_gdb_index_command (char *arg, int from_tty)
22641 struct objfile *objfile;
22644 error (_("usage: save gdb-index DIRECTORY"));
22646 ALL_OBJFILES (objfile)
22650 /* If the objfile does not correspond to an actual file, skip it. */
22651 if (stat (objfile_name (objfile), &st) < 0)
22654 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
22655 if (dwarf2_per_objfile)
22657 volatile struct gdb_exception except;
22659 TRY_CATCH (except, RETURN_MASK_ERROR)
22661 write_psymtabs_to_index (objfile, arg);
22663 if (except.reason < 0)
22664 exception_fprintf (gdb_stderr, except,
22665 _("Error while writing index for `%s': "),
22666 objfile_name (objfile));
22673 int dwarf2_always_disassemble;
22676 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
22677 struct cmd_list_element *c, const char *value)
22679 fprintf_filtered (file,
22680 _("Whether to always disassemble "
22681 "DWARF expressions is %s.\n"),
22686 show_check_physname (struct ui_file *file, int from_tty,
22687 struct cmd_list_element *c, const char *value)
22689 fprintf_filtered (file,
22690 _("Whether to check \"physname\" is %s.\n"),
22694 void _initialize_dwarf2_read (void);
22697 _initialize_dwarf2_read (void)
22699 struct cmd_list_element *c;
22701 dwarf2_objfile_data_key
22702 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
22704 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
22705 Set DWARF 2 specific variables.\n\
22706 Configure DWARF 2 variables such as the cache size"),
22707 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
22708 0/*allow-unknown*/, &maintenance_set_cmdlist);
22710 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
22711 Show DWARF 2 specific variables\n\
22712 Show DWARF 2 variables such as the cache size"),
22713 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
22714 0/*allow-unknown*/, &maintenance_show_cmdlist);
22716 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
22717 &dwarf2_max_cache_age, _("\
22718 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
22719 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
22720 A higher limit means that cached compilation units will be stored\n\
22721 in memory longer, and more total memory will be used. Zero disables\n\
22722 caching, which can slow down startup."),
22724 show_dwarf2_max_cache_age,
22725 &set_dwarf2_cmdlist,
22726 &show_dwarf2_cmdlist);
22728 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
22729 &dwarf2_always_disassemble, _("\
22730 Set whether `info address' always disassembles DWARF expressions."), _("\
22731 Show whether `info address' always disassembles DWARF expressions."), _("\
22732 When enabled, DWARF expressions are always printed in an assembly-like\n\
22733 syntax. When disabled, expressions will be printed in a more\n\
22734 conversational style, when possible."),
22736 show_dwarf2_always_disassemble,
22737 &set_dwarf2_cmdlist,
22738 &show_dwarf2_cmdlist);
22740 add_setshow_zuinteger_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
22741 Set debugging of the dwarf2 reader."), _("\
22742 Show debugging of the dwarf2 reader."), _("\
22743 When enabled (non-zero), debugging messages are printed during dwarf2\n\
22744 reading and symtab expansion. A value of 1 (one) provides basic\n\
22745 information. A value greater than 1 provides more verbose information."),
22748 &setdebuglist, &showdebuglist);
22750 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
22751 Set debugging of the dwarf2 DIE reader."), _("\
22752 Show debugging of the dwarf2 DIE reader."), _("\
22753 When enabled (non-zero), DIEs are dumped after they are read in.\n\
22754 The value is the maximum depth to print."),
22757 &setdebuglist, &showdebuglist);
22759 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
22760 Set cross-checking of \"physname\" code against demangler."), _("\
22761 Show cross-checking of \"physname\" code against demangler."), _("\
22762 When enabled, GDB's internal \"physname\" code is checked against\n\
22764 NULL, show_check_physname,
22765 &setdebuglist, &showdebuglist);
22767 add_setshow_boolean_cmd ("use-deprecated-index-sections",
22768 no_class, &use_deprecated_index_sections, _("\
22769 Set whether to use deprecated gdb_index sections."), _("\
22770 Show whether to use deprecated gdb_index sections."), _("\
22771 When enabled, deprecated .gdb_index sections are used anyway.\n\
22772 Normally they are ignored either because of a missing feature or\n\
22773 performance issue.\n\
22774 Warning: This option must be enabled before gdb reads the file."),
22777 &setlist, &showlist);
22779 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
22781 Save a gdb-index file.\n\
22782 Usage: save gdb-index DIRECTORY"),
22784 set_cmd_completer (c, filename_completer);
22786 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
22787 &dwarf2_locexpr_funcs);
22788 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
22789 &dwarf2_loclist_funcs);
22791 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
22792 &dwarf2_block_frame_base_locexpr_funcs);
22793 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
22794 &dwarf2_block_frame_base_loclist_funcs);