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.
12807 NOTE: we need to call these functions regardless of whether or not the
12808 DIE has a DW_AT_name attribute, since it might be an anonymous
12809 structure or union. This gets the type entered into our set of
12810 user defined types.
12812 However, if the structure is incomplete (an opaque struct/union)
12813 then suppress creating a symbol table entry for it since gdb only
12814 wants to find the one with the complete definition. Note that if
12815 it is complete, we just call new_symbol, which does it's own
12816 checking about whether the struct/union is anonymous or not (and
12817 suppresses creating a symbol table entry itself). */
12819 static struct type *
12820 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
12822 struct objfile *objfile = cu->objfile;
12824 struct attribute *attr;
12827 /* If the definition of this type lives in .debug_types, read that type.
12828 Don't follow DW_AT_specification though, that will take us back up
12829 the chain and we want to go down. */
12830 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12833 type = get_DW_AT_signature_type (die, attr, cu);
12835 /* The type's CU may not be the same as CU.
12836 Ensure TYPE is recorded with CU in die_type_hash. */
12837 return set_die_type (die, type, cu);
12840 type = alloc_type (objfile);
12841 INIT_CPLUS_SPECIFIC (type);
12843 name = dwarf2_name (die, cu);
12846 if (cu->language == language_cplus
12847 || cu->language == language_java)
12849 const char *full_name = dwarf2_full_name (name, die, cu);
12851 /* dwarf2_full_name might have already finished building the DIE's
12852 type. If so, there is no need to continue. */
12853 if (get_die_type (die, cu) != NULL)
12854 return get_die_type (die, cu);
12856 TYPE_TAG_NAME (type) = full_name;
12857 if (die->tag == DW_TAG_structure_type
12858 || die->tag == DW_TAG_class_type)
12859 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12863 /* The name is already allocated along with this objfile, so
12864 we don't need to duplicate it for the type. */
12865 TYPE_TAG_NAME (type) = name;
12866 if (die->tag == DW_TAG_class_type)
12867 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12871 if (die->tag == DW_TAG_structure_type)
12873 TYPE_CODE (type) = TYPE_CODE_STRUCT;
12875 else if (die->tag == DW_TAG_union_type)
12877 TYPE_CODE (type) = TYPE_CODE_UNION;
12881 TYPE_CODE (type) = TYPE_CODE_CLASS;
12884 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
12885 TYPE_DECLARED_CLASS (type) = 1;
12887 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12890 TYPE_LENGTH (type) = DW_UNSND (attr);
12894 TYPE_LENGTH (type) = 0;
12897 if (producer_is_icc (cu))
12899 /* ICC does not output the required DW_AT_declaration
12900 on incomplete types, but gives them a size of zero. */
12903 TYPE_STUB_SUPPORTED (type) = 1;
12905 if (die_is_declaration (die, cu))
12906 TYPE_STUB (type) = 1;
12907 else if (attr == NULL && die->child == NULL
12908 && producer_is_realview (cu->producer))
12909 /* RealView does not output the required DW_AT_declaration
12910 on incomplete types. */
12911 TYPE_STUB (type) = 1;
12913 /* We need to add the type field to the die immediately so we don't
12914 infinitely recurse when dealing with pointers to the structure
12915 type within the structure itself. */
12916 set_die_type (die, type, cu);
12918 /* set_die_type should be already done. */
12919 set_descriptive_type (type, die, cu);
12924 /* Finish creating a structure or union type, including filling in
12925 its members and creating a symbol for it. */
12928 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
12930 struct objfile *objfile = cu->objfile;
12931 struct die_info *child_die = die->child;
12934 type = get_die_type (die, cu);
12936 type = read_structure_type (die, cu);
12938 if (die->child != NULL && ! die_is_declaration (die, cu))
12940 struct field_info fi;
12941 struct die_info *child_die;
12942 VEC (symbolp) *template_args = NULL;
12943 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
12945 memset (&fi, 0, sizeof (struct field_info));
12947 child_die = die->child;
12949 while (child_die && child_die->tag)
12951 if (child_die->tag == DW_TAG_member
12952 || child_die->tag == DW_TAG_variable)
12954 /* NOTE: carlton/2002-11-05: A C++ static data member
12955 should be a DW_TAG_member that is a declaration, but
12956 all versions of G++ as of this writing (so through at
12957 least 3.2.1) incorrectly generate DW_TAG_variable
12958 tags for them instead. */
12959 dwarf2_add_field (&fi, child_die, cu);
12961 else if (child_die->tag == DW_TAG_subprogram)
12963 /* C++ member function. */
12964 dwarf2_add_member_fn (&fi, child_die, type, cu);
12966 else if (child_die->tag == DW_TAG_inheritance)
12968 /* C++ base class field. */
12969 dwarf2_add_field (&fi, child_die, cu);
12971 else if (child_die->tag == DW_TAG_typedef)
12972 dwarf2_add_typedef (&fi, child_die, cu);
12973 else if (child_die->tag == DW_TAG_template_type_param
12974 || child_die->tag == DW_TAG_template_value_param)
12976 struct symbol *arg = new_symbol (child_die, NULL, cu);
12979 VEC_safe_push (symbolp, template_args, arg);
12982 child_die = sibling_die (child_die);
12985 /* Attach template arguments to type. */
12986 if (! VEC_empty (symbolp, template_args))
12988 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12989 TYPE_N_TEMPLATE_ARGUMENTS (type)
12990 = VEC_length (symbolp, template_args);
12991 TYPE_TEMPLATE_ARGUMENTS (type)
12992 = obstack_alloc (&objfile->objfile_obstack,
12993 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12994 * sizeof (struct symbol *)));
12995 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
12996 VEC_address (symbolp, template_args),
12997 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12998 * sizeof (struct symbol *)));
12999 VEC_free (symbolp, template_args);
13002 /* Attach fields and member functions to the type. */
13004 dwarf2_attach_fields_to_type (&fi, type, cu);
13007 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13009 /* Get the type which refers to the base class (possibly this
13010 class itself) which contains the vtable pointer for the current
13011 class from the DW_AT_containing_type attribute. This use of
13012 DW_AT_containing_type is a GNU extension. */
13014 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13016 struct type *t = die_containing_type (die, cu);
13018 TYPE_VPTR_BASETYPE (type) = t;
13023 /* Our own class provides vtbl ptr. */
13024 for (i = TYPE_NFIELDS (t) - 1;
13025 i >= TYPE_N_BASECLASSES (t);
13028 const char *fieldname = TYPE_FIELD_NAME (t, i);
13030 if (is_vtable_name (fieldname, cu))
13032 TYPE_VPTR_FIELDNO (type) = i;
13037 /* Complain if virtual function table field not found. */
13038 if (i < TYPE_N_BASECLASSES (t))
13039 complaint (&symfile_complaints,
13040 _("virtual function table pointer "
13041 "not found when defining class '%s'"),
13042 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13047 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
13050 else if (cu->producer
13051 && strncmp (cu->producer,
13052 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
13054 /* The IBM XLC compiler does not provide direct indication
13055 of the containing type, but the vtable pointer is
13056 always named __vfp. */
13060 for (i = TYPE_NFIELDS (type) - 1;
13061 i >= TYPE_N_BASECLASSES (type);
13064 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13066 TYPE_VPTR_FIELDNO (type) = i;
13067 TYPE_VPTR_BASETYPE (type) = type;
13074 /* Copy fi.typedef_field_list linked list elements content into the
13075 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13076 if (fi.typedef_field_list)
13078 int i = fi.typedef_field_list_count;
13080 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13081 TYPE_TYPEDEF_FIELD_ARRAY (type)
13082 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
13083 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13085 /* Reverse the list order to keep the debug info elements order. */
13088 struct typedef_field *dest, *src;
13090 dest = &TYPE_TYPEDEF_FIELD (type, i);
13091 src = &fi.typedef_field_list->field;
13092 fi.typedef_field_list = fi.typedef_field_list->next;
13097 do_cleanups (back_to);
13099 if (HAVE_CPLUS_STRUCT (type))
13100 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
13103 quirk_gcc_member_function_pointer (type, objfile);
13105 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13106 snapshots) has been known to create a die giving a declaration
13107 for a class that has, as a child, a die giving a definition for a
13108 nested class. So we have to process our children even if the
13109 current die is a declaration. Normally, of course, a declaration
13110 won't have any children at all. */
13112 while (child_die != NULL && child_die->tag)
13114 if (child_die->tag == DW_TAG_member
13115 || child_die->tag == DW_TAG_variable
13116 || child_die->tag == DW_TAG_inheritance
13117 || child_die->tag == DW_TAG_template_value_param
13118 || child_die->tag == DW_TAG_template_type_param)
13123 process_die (child_die, cu);
13125 child_die = sibling_die (child_die);
13128 /* Do not consider external references. According to the DWARF standard,
13129 these DIEs are identified by the fact that they have no byte_size
13130 attribute, and a declaration attribute. */
13131 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13132 || !die_is_declaration (die, cu))
13133 new_symbol (die, type, cu);
13136 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13137 update TYPE using some information only available in DIE's children. */
13140 update_enumeration_type_from_children (struct die_info *die,
13142 struct dwarf2_cu *cu)
13144 struct obstack obstack;
13145 struct die_info *child_die = die->child;
13146 int unsigned_enum = 1;
13149 struct cleanup *old_chain;
13151 obstack_init (&obstack);
13152 old_chain = make_cleanup_obstack_free (&obstack);
13154 while (child_die != NULL && child_die->tag)
13156 struct attribute *attr;
13158 const gdb_byte *bytes;
13159 struct dwarf2_locexpr_baton *baton;
13161 if (child_die->tag != DW_TAG_enumerator)
13164 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13168 name = dwarf2_name (child_die, cu);
13170 name = "<anonymous enumerator>";
13172 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13173 &value, &bytes, &baton);
13179 else if ((mask & value) != 0)
13184 /* If we already know that the enum type is neither unsigned, nor
13185 a flag type, no need to look at the rest of the enumerates. */
13186 if (!unsigned_enum && !flag_enum)
13188 child_die = sibling_die (child_die);
13192 TYPE_UNSIGNED (type) = 1;
13194 TYPE_FLAG_ENUM (type) = 1;
13196 do_cleanups (old_chain);
13199 /* Given a DW_AT_enumeration_type die, set its type. We do not
13200 complete the type's fields yet, or create any symbols. */
13202 static struct type *
13203 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13205 struct objfile *objfile = cu->objfile;
13207 struct attribute *attr;
13210 /* If the definition of this type lives in .debug_types, read that type.
13211 Don't follow DW_AT_specification though, that will take us back up
13212 the chain and we want to go down. */
13213 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13216 type = get_DW_AT_signature_type (die, attr, cu);
13218 /* The type's CU may not be the same as CU.
13219 Ensure TYPE is recorded with CU in die_type_hash. */
13220 return set_die_type (die, type, cu);
13223 type = alloc_type (objfile);
13225 TYPE_CODE (type) = TYPE_CODE_ENUM;
13226 name = dwarf2_full_name (NULL, die, cu);
13228 TYPE_TAG_NAME (type) = name;
13230 attr = dwarf2_attr (die, DW_AT_type, cu);
13233 struct type *underlying_type = die_type (die, cu);
13235 TYPE_TARGET_TYPE (type) = underlying_type;
13238 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13241 TYPE_LENGTH (type) = DW_UNSND (attr);
13245 TYPE_LENGTH (type) = 0;
13248 /* The enumeration DIE can be incomplete. In Ada, any type can be
13249 declared as private in the package spec, and then defined only
13250 inside the package body. Such types are known as Taft Amendment
13251 Types. When another package uses such a type, an incomplete DIE
13252 may be generated by the compiler. */
13253 if (die_is_declaration (die, cu))
13254 TYPE_STUB (type) = 1;
13256 /* Finish the creation of this type by using the enum's children.
13257 We must call this even when the underlying type has been provided
13258 so that we can determine if we're looking at a "flag" enum. */
13259 update_enumeration_type_from_children (die, type, cu);
13261 /* If this type has an underlying type that is not a stub, then we
13262 may use its attributes. We always use the "unsigned" attribute
13263 in this situation, because ordinarily we guess whether the type
13264 is unsigned -- but the guess can be wrong and the underlying type
13265 can tell us the reality. However, we defer to a local size
13266 attribute if one exists, because this lets the compiler override
13267 the underlying type if needed. */
13268 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13270 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13271 if (TYPE_LENGTH (type) == 0)
13272 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13275 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
13277 return set_die_type (die, type, cu);
13280 /* Given a pointer to a die which begins an enumeration, process all
13281 the dies that define the members of the enumeration, and create the
13282 symbol for the enumeration type.
13284 NOTE: We reverse the order of the element list. */
13287 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
13289 struct type *this_type;
13291 this_type = get_die_type (die, cu);
13292 if (this_type == NULL)
13293 this_type = read_enumeration_type (die, cu);
13295 if (die->child != NULL)
13297 struct die_info *child_die;
13298 struct symbol *sym;
13299 struct field *fields = NULL;
13300 int num_fields = 0;
13303 child_die = die->child;
13304 while (child_die && child_die->tag)
13306 if (child_die->tag != DW_TAG_enumerator)
13308 process_die (child_die, cu);
13312 name = dwarf2_name (child_die, cu);
13315 sym = new_symbol (child_die, this_type, cu);
13317 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
13319 fields = (struct field *)
13321 (num_fields + DW_FIELD_ALLOC_CHUNK)
13322 * sizeof (struct field));
13325 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
13326 FIELD_TYPE (fields[num_fields]) = NULL;
13327 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
13328 FIELD_BITSIZE (fields[num_fields]) = 0;
13334 child_die = sibling_die (child_die);
13339 TYPE_NFIELDS (this_type) = num_fields;
13340 TYPE_FIELDS (this_type) = (struct field *)
13341 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
13342 memcpy (TYPE_FIELDS (this_type), fields,
13343 sizeof (struct field) * num_fields);
13348 /* If we are reading an enum from a .debug_types unit, and the enum
13349 is a declaration, and the enum is not the signatured type in the
13350 unit, then we do not want to add a symbol for it. Adding a
13351 symbol would in some cases obscure the true definition of the
13352 enum, giving users an incomplete type when the definition is
13353 actually available. Note that we do not want to do this for all
13354 enums which are just declarations, because C++0x allows forward
13355 enum declarations. */
13356 if (cu->per_cu->is_debug_types
13357 && die_is_declaration (die, cu))
13359 struct signatured_type *sig_type;
13361 sig_type = (struct signatured_type *) cu->per_cu;
13362 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
13363 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
13367 new_symbol (die, this_type, cu);
13370 /* Extract all information from a DW_TAG_array_type DIE and put it in
13371 the DIE's type field. For now, this only handles one dimensional
13374 static struct type *
13375 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
13377 struct objfile *objfile = cu->objfile;
13378 struct die_info *child_die;
13380 struct type *element_type, *range_type, *index_type;
13381 struct type **range_types = NULL;
13382 struct attribute *attr;
13384 struct cleanup *back_to;
13386 unsigned int bit_stride = 0;
13388 element_type = die_type (die, cu);
13390 /* The die_type call above may have already set the type for this DIE. */
13391 type = get_die_type (die, cu);
13395 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
13397 bit_stride = DW_UNSND (attr) * 8;
13399 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
13401 bit_stride = DW_UNSND (attr);
13403 /* Irix 6.2 native cc creates array types without children for
13404 arrays with unspecified length. */
13405 if (die->child == NULL)
13407 index_type = objfile_type (objfile)->builtin_int;
13408 range_type = create_static_range_type (NULL, index_type, 0, -1);
13409 type = create_array_type_with_stride (NULL, element_type, range_type,
13411 return set_die_type (die, type, cu);
13414 back_to = make_cleanup (null_cleanup, NULL);
13415 child_die = die->child;
13416 while (child_die && child_die->tag)
13418 if (child_die->tag == DW_TAG_subrange_type)
13420 struct type *child_type = read_type_die (child_die, cu);
13422 if (child_type != NULL)
13424 /* The range type was succesfully read. Save it for the
13425 array type creation. */
13426 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
13428 range_types = (struct type **)
13429 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
13430 * sizeof (struct type *));
13432 make_cleanup (free_current_contents, &range_types);
13434 range_types[ndim++] = child_type;
13437 child_die = sibling_die (child_die);
13440 /* Dwarf2 dimensions are output from left to right, create the
13441 necessary array types in backwards order. */
13443 type = element_type;
13445 if (read_array_order (die, cu) == DW_ORD_col_major)
13450 type = create_array_type_with_stride (NULL, type, range_types[i++],
13456 type = create_array_type_with_stride (NULL, type, range_types[ndim],
13460 /* Understand Dwarf2 support for vector types (like they occur on
13461 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
13462 array type. This is not part of the Dwarf2/3 standard yet, but a
13463 custom vendor extension. The main difference between a regular
13464 array and the vector variant is that vectors are passed by value
13466 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
13468 make_vector_type (type);
13470 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
13471 implementation may choose to implement triple vectors using this
13473 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13476 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
13477 TYPE_LENGTH (type) = DW_UNSND (attr);
13479 complaint (&symfile_complaints,
13480 _("DW_AT_byte_size for array type smaller "
13481 "than the total size of elements"));
13484 name = dwarf2_name (die, cu);
13486 TYPE_NAME (type) = name;
13488 /* Install the type in the die. */
13489 set_die_type (die, type, cu);
13491 /* set_die_type should be already done. */
13492 set_descriptive_type (type, die, cu);
13494 do_cleanups (back_to);
13499 static enum dwarf_array_dim_ordering
13500 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
13502 struct attribute *attr;
13504 attr = dwarf2_attr (die, DW_AT_ordering, cu);
13506 if (attr) return DW_SND (attr);
13508 /* GNU F77 is a special case, as at 08/2004 array type info is the
13509 opposite order to the dwarf2 specification, but data is still
13510 laid out as per normal fortran.
13512 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
13513 version checking. */
13515 if (cu->language == language_fortran
13516 && cu->producer && strstr (cu->producer, "GNU F77"))
13518 return DW_ORD_row_major;
13521 switch (cu->language_defn->la_array_ordering)
13523 case array_column_major:
13524 return DW_ORD_col_major;
13525 case array_row_major:
13527 return DW_ORD_row_major;
13531 /* Extract all information from a DW_TAG_set_type DIE and put it in
13532 the DIE's type field. */
13534 static struct type *
13535 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
13537 struct type *domain_type, *set_type;
13538 struct attribute *attr;
13540 domain_type = die_type (die, cu);
13542 /* The die_type call above may have already set the type for this DIE. */
13543 set_type = get_die_type (die, cu);
13547 set_type = create_set_type (NULL, domain_type);
13549 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13551 TYPE_LENGTH (set_type) = DW_UNSND (attr);
13553 return set_die_type (die, set_type, cu);
13556 /* A helper for read_common_block that creates a locexpr baton.
13557 SYM is the symbol which we are marking as computed.
13558 COMMON_DIE is the DIE for the common block.
13559 COMMON_LOC is the location expression attribute for the common
13561 MEMBER_LOC is the location expression attribute for the particular
13562 member of the common block that we are processing.
13563 CU is the CU from which the above come. */
13566 mark_common_block_symbol_computed (struct symbol *sym,
13567 struct die_info *common_die,
13568 struct attribute *common_loc,
13569 struct attribute *member_loc,
13570 struct dwarf2_cu *cu)
13572 struct objfile *objfile = dwarf2_per_objfile->objfile;
13573 struct dwarf2_locexpr_baton *baton;
13575 unsigned int cu_off;
13576 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
13577 LONGEST offset = 0;
13579 gdb_assert (common_loc && member_loc);
13580 gdb_assert (attr_form_is_block (common_loc));
13581 gdb_assert (attr_form_is_block (member_loc)
13582 || attr_form_is_constant (member_loc));
13584 baton = obstack_alloc (&objfile->objfile_obstack,
13585 sizeof (struct dwarf2_locexpr_baton));
13586 baton->per_cu = cu->per_cu;
13587 gdb_assert (baton->per_cu);
13589 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
13591 if (attr_form_is_constant (member_loc))
13593 offset = dwarf2_get_attr_constant_value (member_loc, 0);
13594 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
13597 baton->size += DW_BLOCK (member_loc)->size;
13599 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
13602 *ptr++ = DW_OP_call4;
13603 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
13604 store_unsigned_integer (ptr, 4, byte_order, cu_off);
13607 if (attr_form_is_constant (member_loc))
13609 *ptr++ = DW_OP_addr;
13610 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
13611 ptr += cu->header.addr_size;
13615 /* We have to copy the data here, because DW_OP_call4 will only
13616 use a DW_AT_location attribute. */
13617 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
13618 ptr += DW_BLOCK (member_loc)->size;
13621 *ptr++ = DW_OP_plus;
13622 gdb_assert (ptr - baton->data == baton->size);
13624 SYMBOL_LOCATION_BATON (sym) = baton;
13625 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
13628 /* Create appropriate locally-scoped variables for all the
13629 DW_TAG_common_block entries. Also create a struct common_block
13630 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
13631 is used to sepate the common blocks name namespace from regular
13635 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
13637 struct attribute *attr;
13639 attr = dwarf2_attr (die, DW_AT_location, cu);
13642 /* Support the .debug_loc offsets. */
13643 if (attr_form_is_block (attr))
13647 else if (attr_form_is_section_offset (attr))
13649 dwarf2_complex_location_expr_complaint ();
13654 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13655 "common block member");
13660 if (die->child != NULL)
13662 struct objfile *objfile = cu->objfile;
13663 struct die_info *child_die;
13664 size_t n_entries = 0, size;
13665 struct common_block *common_block;
13666 struct symbol *sym;
13668 for (child_die = die->child;
13669 child_die && child_die->tag;
13670 child_die = sibling_die (child_die))
13673 size = (sizeof (struct common_block)
13674 + (n_entries - 1) * sizeof (struct symbol *));
13675 common_block = obstack_alloc (&objfile->objfile_obstack, size);
13676 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
13677 common_block->n_entries = 0;
13679 for (child_die = die->child;
13680 child_die && child_die->tag;
13681 child_die = sibling_die (child_die))
13683 /* Create the symbol in the DW_TAG_common_block block in the current
13685 sym = new_symbol (child_die, NULL, cu);
13688 struct attribute *member_loc;
13690 common_block->contents[common_block->n_entries++] = sym;
13692 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
13696 /* GDB has handled this for a long time, but it is
13697 not specified by DWARF. It seems to have been
13698 emitted by gfortran at least as recently as:
13699 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
13700 complaint (&symfile_complaints,
13701 _("Variable in common block has "
13702 "DW_AT_data_member_location "
13703 "- DIE at 0x%x [in module %s]"),
13704 child_die->offset.sect_off,
13705 objfile_name (cu->objfile));
13707 if (attr_form_is_section_offset (member_loc))
13708 dwarf2_complex_location_expr_complaint ();
13709 else if (attr_form_is_constant (member_loc)
13710 || attr_form_is_block (member_loc))
13713 mark_common_block_symbol_computed (sym, die, attr,
13717 dwarf2_complex_location_expr_complaint ();
13722 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
13723 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
13727 /* Create a type for a C++ namespace. */
13729 static struct type *
13730 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
13732 struct objfile *objfile = cu->objfile;
13733 const char *previous_prefix, *name;
13737 /* For extensions, reuse the type of the original namespace. */
13738 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
13740 struct die_info *ext_die;
13741 struct dwarf2_cu *ext_cu = cu;
13743 ext_die = dwarf2_extension (die, &ext_cu);
13744 type = read_type_die (ext_die, ext_cu);
13746 /* EXT_CU may not be the same as CU.
13747 Ensure TYPE is recorded with CU in die_type_hash. */
13748 return set_die_type (die, type, cu);
13751 name = namespace_name (die, &is_anonymous, cu);
13753 /* Now build the name of the current namespace. */
13755 previous_prefix = determine_prefix (die, cu);
13756 if (previous_prefix[0] != '\0')
13757 name = typename_concat (&objfile->objfile_obstack,
13758 previous_prefix, name, 0, cu);
13760 /* Create the type. */
13761 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
13763 TYPE_NAME (type) = name;
13764 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13766 return set_die_type (die, type, cu);
13769 /* Read a C++ namespace. */
13772 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
13774 struct objfile *objfile = cu->objfile;
13777 /* Add a symbol associated to this if we haven't seen the namespace
13778 before. Also, add a using directive if it's an anonymous
13781 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
13785 type = read_type_die (die, cu);
13786 new_symbol (die, type, cu);
13788 namespace_name (die, &is_anonymous, cu);
13791 const char *previous_prefix = determine_prefix (die, cu);
13793 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
13794 NULL, NULL, 0, &objfile->objfile_obstack);
13798 if (die->child != NULL)
13800 struct die_info *child_die = die->child;
13802 while (child_die && child_die->tag)
13804 process_die (child_die, cu);
13805 child_die = sibling_die (child_die);
13810 /* Read a Fortran module as type. This DIE can be only a declaration used for
13811 imported module. Still we need that type as local Fortran "use ... only"
13812 declaration imports depend on the created type in determine_prefix. */
13814 static struct type *
13815 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
13817 struct objfile *objfile = cu->objfile;
13818 const char *module_name;
13821 module_name = dwarf2_name (die, cu);
13823 complaint (&symfile_complaints,
13824 _("DW_TAG_module has no name, offset 0x%x"),
13825 die->offset.sect_off);
13826 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
13828 /* determine_prefix uses TYPE_TAG_NAME. */
13829 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13831 return set_die_type (die, type, cu);
13834 /* Read a Fortran module. */
13837 read_module (struct die_info *die, struct dwarf2_cu *cu)
13839 struct die_info *child_die = die->child;
13842 type = read_type_die (die, cu);
13843 new_symbol (die, type, cu);
13845 while (child_die && child_die->tag)
13847 process_die (child_die, cu);
13848 child_die = sibling_die (child_die);
13852 /* Return the name of the namespace represented by DIE. Set
13853 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
13856 static const char *
13857 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
13859 struct die_info *current_die;
13860 const char *name = NULL;
13862 /* Loop through the extensions until we find a name. */
13864 for (current_die = die;
13865 current_die != NULL;
13866 current_die = dwarf2_extension (die, &cu))
13868 name = dwarf2_name (current_die, cu);
13873 /* Is it an anonymous namespace? */
13875 *is_anonymous = (name == NULL);
13877 name = CP_ANONYMOUS_NAMESPACE_STR;
13882 /* Extract all information from a DW_TAG_pointer_type DIE and add to
13883 the user defined type vector. */
13885 static struct type *
13886 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
13888 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
13889 struct comp_unit_head *cu_header = &cu->header;
13891 struct attribute *attr_byte_size;
13892 struct attribute *attr_address_class;
13893 int byte_size, addr_class;
13894 struct type *target_type;
13896 target_type = die_type (die, cu);
13898 /* The die_type call above may have already set the type for this DIE. */
13899 type = get_die_type (die, cu);
13903 type = lookup_pointer_type (target_type);
13905 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
13906 if (attr_byte_size)
13907 byte_size = DW_UNSND (attr_byte_size);
13909 byte_size = cu_header->addr_size;
13911 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
13912 if (attr_address_class)
13913 addr_class = DW_UNSND (attr_address_class);
13915 addr_class = DW_ADDR_none;
13917 /* If the pointer size or address class is different than the
13918 default, create a type variant marked as such and set the
13919 length accordingly. */
13920 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
13922 if (gdbarch_address_class_type_flags_p (gdbarch))
13926 type_flags = gdbarch_address_class_type_flags
13927 (gdbarch, byte_size, addr_class);
13928 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
13930 type = make_type_with_address_space (type, type_flags);
13932 else if (TYPE_LENGTH (type) != byte_size)
13934 complaint (&symfile_complaints,
13935 _("invalid pointer size %d"), byte_size);
13939 /* Should we also complain about unhandled address classes? */
13943 TYPE_LENGTH (type) = byte_size;
13944 return set_die_type (die, type, cu);
13947 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
13948 the user defined type vector. */
13950 static struct type *
13951 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
13954 struct type *to_type;
13955 struct type *domain;
13957 to_type = die_type (die, cu);
13958 domain = die_containing_type (die, cu);
13960 /* The calls above may have already set the type for this DIE. */
13961 type = get_die_type (die, cu);
13965 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
13966 type = lookup_methodptr_type (to_type);
13967 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
13969 struct type *new_type = alloc_type (cu->objfile);
13971 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
13972 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
13973 TYPE_VARARGS (to_type));
13974 type = lookup_methodptr_type (new_type);
13977 type = lookup_memberptr_type (to_type, domain);
13979 return set_die_type (die, type, cu);
13982 /* Extract all information from a DW_TAG_reference_type DIE and add to
13983 the user defined type vector. */
13985 static struct type *
13986 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
13988 struct comp_unit_head *cu_header = &cu->header;
13989 struct type *type, *target_type;
13990 struct attribute *attr;
13992 target_type = die_type (die, cu);
13994 /* The die_type call above may have already set the type for this DIE. */
13995 type = get_die_type (die, cu);
13999 type = lookup_reference_type (target_type);
14000 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14003 TYPE_LENGTH (type) = DW_UNSND (attr);
14007 TYPE_LENGTH (type) = cu_header->addr_size;
14009 return set_die_type (die, type, cu);
14012 static struct type *
14013 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14015 struct type *base_type, *cv_type;
14017 base_type = die_type (die, cu);
14019 /* The die_type call above may have already set the type for this DIE. */
14020 cv_type = get_die_type (die, cu);
14024 /* In case the const qualifier is applied to an array type, the element type
14025 is so qualified, not the array type (section 6.7.3 of C99). */
14026 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14028 struct type *el_type, *inner_array;
14030 base_type = copy_type (base_type);
14031 inner_array = base_type;
14033 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14035 TYPE_TARGET_TYPE (inner_array) =
14036 copy_type (TYPE_TARGET_TYPE (inner_array));
14037 inner_array = TYPE_TARGET_TYPE (inner_array);
14040 el_type = TYPE_TARGET_TYPE (inner_array);
14041 TYPE_TARGET_TYPE (inner_array) =
14042 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
14044 return set_die_type (die, base_type, cu);
14047 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14048 return set_die_type (die, cv_type, cu);
14051 static struct type *
14052 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14054 struct type *base_type, *cv_type;
14056 base_type = die_type (die, cu);
14058 /* The die_type call above may have already set the type for this DIE. */
14059 cv_type = get_die_type (die, cu);
14063 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14064 return set_die_type (die, cv_type, cu);
14067 /* Handle DW_TAG_restrict_type. */
14069 static struct type *
14070 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14072 struct type *base_type, *cv_type;
14074 base_type = die_type (die, cu);
14076 /* The die_type call above may have already set the type for this DIE. */
14077 cv_type = get_die_type (die, cu);
14081 cv_type = make_restrict_type (base_type);
14082 return set_die_type (die, cv_type, cu);
14085 /* Extract all information from a DW_TAG_string_type DIE and add to
14086 the user defined type vector. It isn't really a user defined type,
14087 but it behaves like one, with other DIE's using an AT_user_def_type
14088 attribute to reference it. */
14090 static struct type *
14091 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14093 struct objfile *objfile = cu->objfile;
14094 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14095 struct type *type, *range_type, *index_type, *char_type;
14096 struct attribute *attr;
14097 unsigned int length;
14099 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14102 length = DW_UNSND (attr);
14106 /* Check for the DW_AT_byte_size attribute. */
14107 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14110 length = DW_UNSND (attr);
14118 index_type = objfile_type (objfile)->builtin_int;
14119 range_type = create_static_range_type (NULL, index_type, 1, length);
14120 char_type = language_string_char_type (cu->language_defn, gdbarch);
14121 type = create_string_type (NULL, char_type, range_type);
14123 return set_die_type (die, type, cu);
14126 /* Assuming that DIE corresponds to a function, returns nonzero
14127 if the function is prototyped. */
14130 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14132 struct attribute *attr;
14134 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14135 if (attr && (DW_UNSND (attr) != 0))
14138 /* The DWARF standard implies that the DW_AT_prototyped attribute
14139 is only meaninful for C, but the concept also extends to other
14140 languages that allow unprototyped functions (Eg: Objective C).
14141 For all other languages, assume that functions are always
14143 if (cu->language != language_c
14144 && cu->language != language_objc
14145 && cu->language != language_opencl)
14148 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14149 prototyped and unprototyped functions; default to prototyped,
14150 since that is more common in modern code (and RealView warns
14151 about unprototyped functions). */
14152 if (producer_is_realview (cu->producer))
14158 /* Handle DIES due to C code like:
14162 int (*funcp)(int a, long l);
14166 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14168 static struct type *
14169 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14171 struct objfile *objfile = cu->objfile;
14172 struct type *type; /* Type that this function returns. */
14173 struct type *ftype; /* Function that returns above type. */
14174 struct attribute *attr;
14176 type = die_type (die, cu);
14178 /* The die_type call above may have already set the type for this DIE. */
14179 ftype = get_die_type (die, cu);
14183 ftype = lookup_function_type (type);
14185 if (prototyped_function_p (die, cu))
14186 TYPE_PROTOTYPED (ftype) = 1;
14188 /* Store the calling convention in the type if it's available in
14189 the subroutine die. Otherwise set the calling convention to
14190 the default value DW_CC_normal. */
14191 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14193 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14194 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14195 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14197 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14199 /* We need to add the subroutine type to the die immediately so
14200 we don't infinitely recurse when dealing with parameters
14201 declared as the same subroutine type. */
14202 set_die_type (die, ftype, cu);
14204 if (die->child != NULL)
14206 struct type *void_type = objfile_type (objfile)->builtin_void;
14207 struct die_info *child_die;
14208 int nparams, iparams;
14210 /* Count the number of parameters.
14211 FIXME: GDB currently ignores vararg functions, but knows about
14212 vararg member functions. */
14214 child_die = die->child;
14215 while (child_die && child_die->tag)
14217 if (child_die->tag == DW_TAG_formal_parameter)
14219 else if (child_die->tag == DW_TAG_unspecified_parameters)
14220 TYPE_VARARGS (ftype) = 1;
14221 child_die = sibling_die (child_die);
14224 /* Allocate storage for parameters and fill them in. */
14225 TYPE_NFIELDS (ftype) = nparams;
14226 TYPE_FIELDS (ftype) = (struct field *)
14227 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
14229 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
14230 even if we error out during the parameters reading below. */
14231 for (iparams = 0; iparams < nparams; iparams++)
14232 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
14235 child_die = die->child;
14236 while (child_die && child_die->tag)
14238 if (child_die->tag == DW_TAG_formal_parameter)
14240 struct type *arg_type;
14242 /* DWARF version 2 has no clean way to discern C++
14243 static and non-static member functions. G++ helps
14244 GDB by marking the first parameter for non-static
14245 member functions (which is the this pointer) as
14246 artificial. We pass this information to
14247 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
14249 DWARF version 3 added DW_AT_object_pointer, which GCC
14250 4.5 does not yet generate. */
14251 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
14253 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
14256 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
14258 /* GCC/43521: In java, the formal parameter
14259 "this" is sometimes not marked with DW_AT_artificial. */
14260 if (cu->language == language_java)
14262 const char *name = dwarf2_name (child_die, cu);
14264 if (name && !strcmp (name, "this"))
14265 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
14268 arg_type = die_type (child_die, cu);
14270 /* RealView does not mark THIS as const, which the testsuite
14271 expects. GCC marks THIS as const in method definitions,
14272 but not in the class specifications (GCC PR 43053). */
14273 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
14274 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
14277 struct dwarf2_cu *arg_cu = cu;
14278 const char *name = dwarf2_name (child_die, cu);
14280 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
14283 /* If the compiler emits this, use it. */
14284 if (follow_die_ref (die, attr, &arg_cu) == child_die)
14287 else if (name && strcmp (name, "this") == 0)
14288 /* Function definitions will have the argument names. */
14290 else if (name == NULL && iparams == 0)
14291 /* Declarations may not have the names, so like
14292 elsewhere in GDB, assume an artificial first
14293 argument is "this". */
14297 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
14301 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
14304 child_die = sibling_die (child_die);
14311 static struct type *
14312 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
14314 struct objfile *objfile = cu->objfile;
14315 const char *name = NULL;
14316 struct type *this_type, *target_type;
14318 name = dwarf2_full_name (NULL, die, cu);
14319 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
14320 TYPE_FLAG_TARGET_STUB, NULL, objfile);
14321 TYPE_NAME (this_type) = name;
14322 set_die_type (die, this_type, cu);
14323 target_type = die_type (die, cu);
14324 if (target_type != this_type)
14325 TYPE_TARGET_TYPE (this_type) = target_type;
14328 /* Self-referential typedefs are, it seems, not allowed by the DWARF
14329 spec and cause infinite loops in GDB. */
14330 complaint (&symfile_complaints,
14331 _("Self-referential DW_TAG_typedef "
14332 "- DIE at 0x%x [in module %s]"),
14333 die->offset.sect_off, objfile_name (objfile));
14334 TYPE_TARGET_TYPE (this_type) = NULL;
14339 /* Find a representation of a given base type and install
14340 it in the TYPE field of the die. */
14342 static struct type *
14343 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
14345 struct objfile *objfile = cu->objfile;
14347 struct attribute *attr;
14348 int encoding = 0, size = 0;
14350 enum type_code code = TYPE_CODE_INT;
14351 int type_flags = 0;
14352 struct type *target_type = NULL;
14354 attr = dwarf2_attr (die, DW_AT_encoding, cu);
14357 encoding = DW_UNSND (attr);
14359 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14362 size = DW_UNSND (attr);
14364 name = dwarf2_name (die, cu);
14367 complaint (&symfile_complaints,
14368 _("DW_AT_name missing from DW_TAG_base_type"));
14373 case DW_ATE_address:
14374 /* Turn DW_ATE_address into a void * pointer. */
14375 code = TYPE_CODE_PTR;
14376 type_flags |= TYPE_FLAG_UNSIGNED;
14377 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
14379 case DW_ATE_boolean:
14380 code = TYPE_CODE_BOOL;
14381 type_flags |= TYPE_FLAG_UNSIGNED;
14383 case DW_ATE_complex_float:
14384 code = TYPE_CODE_COMPLEX;
14385 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
14387 case DW_ATE_decimal_float:
14388 code = TYPE_CODE_DECFLOAT;
14391 code = TYPE_CODE_FLT;
14393 case DW_ATE_signed:
14395 case DW_ATE_unsigned:
14396 type_flags |= TYPE_FLAG_UNSIGNED;
14397 if (cu->language == language_fortran
14399 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
14400 code = TYPE_CODE_CHAR;
14402 case DW_ATE_signed_char:
14403 if (cu->language == language_ada || cu->language == language_m2
14404 || cu->language == language_pascal
14405 || cu->language == language_fortran)
14406 code = TYPE_CODE_CHAR;
14408 case DW_ATE_unsigned_char:
14409 if (cu->language == language_ada || cu->language == language_m2
14410 || cu->language == language_pascal
14411 || cu->language == language_fortran)
14412 code = TYPE_CODE_CHAR;
14413 type_flags |= TYPE_FLAG_UNSIGNED;
14416 /* We just treat this as an integer and then recognize the
14417 type by name elsewhere. */
14421 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
14422 dwarf_type_encoding_name (encoding));
14426 type = init_type (code, size, type_flags, NULL, objfile);
14427 TYPE_NAME (type) = name;
14428 TYPE_TARGET_TYPE (type) = target_type;
14430 if (name && strcmp (name, "char") == 0)
14431 TYPE_NOSIGN (type) = 1;
14433 return set_die_type (die, type, cu);
14436 /* Parse dwarf attribute if it's a block, reference or constant and put the
14437 resulting value of the attribute into struct bound_prop.
14438 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
14441 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
14442 struct dwarf2_cu *cu, struct dynamic_prop *prop)
14444 struct dwarf2_property_baton *baton;
14445 struct obstack *obstack = &cu->objfile->objfile_obstack;
14447 if (attr == NULL || prop == NULL)
14450 if (attr_form_is_block (attr))
14452 baton = obstack_alloc (obstack, sizeof (*baton));
14453 baton->referenced_type = NULL;
14454 baton->locexpr.per_cu = cu->per_cu;
14455 baton->locexpr.size = DW_BLOCK (attr)->size;
14456 baton->locexpr.data = DW_BLOCK (attr)->data;
14457 prop->data.baton = baton;
14458 prop->kind = PROP_LOCEXPR;
14459 gdb_assert (prop->data.baton != NULL);
14461 else if (attr_form_is_ref (attr))
14463 struct dwarf2_cu *target_cu = cu;
14464 struct die_info *target_die;
14465 struct attribute *target_attr;
14467 target_die = follow_die_ref (die, attr, &target_cu);
14468 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
14469 if (target_attr == NULL)
14472 if (attr_form_is_section_offset (target_attr))
14474 baton = obstack_alloc (obstack, sizeof (*baton));
14475 baton->referenced_type = die_type (target_die, target_cu);
14476 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
14477 prop->data.baton = baton;
14478 prop->kind = PROP_LOCLIST;
14479 gdb_assert (prop->data.baton != NULL);
14481 else if (attr_form_is_block (target_attr))
14483 baton = obstack_alloc (obstack, sizeof (*baton));
14484 baton->referenced_type = die_type (target_die, target_cu);
14485 baton->locexpr.per_cu = cu->per_cu;
14486 baton->locexpr.size = DW_BLOCK (target_attr)->size;
14487 baton->locexpr.data = DW_BLOCK (target_attr)->data;
14488 prop->data.baton = baton;
14489 prop->kind = PROP_LOCEXPR;
14490 gdb_assert (prop->data.baton != NULL);
14494 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14495 "dynamic property");
14499 else if (attr_form_is_constant (attr))
14501 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
14502 prop->kind = PROP_CONST;
14506 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
14507 dwarf2_name (die, cu));
14514 /* Read the given DW_AT_subrange DIE. */
14516 static struct type *
14517 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
14519 struct type *base_type, *orig_base_type;
14520 struct type *range_type;
14521 struct attribute *attr;
14522 struct dynamic_prop low, high;
14523 int low_default_is_valid;
14524 int high_bound_is_count = 0;
14526 LONGEST negative_mask;
14528 orig_base_type = die_type (die, cu);
14529 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
14530 whereas the real type might be. So, we use ORIG_BASE_TYPE when
14531 creating the range type, but we use the result of check_typedef
14532 when examining properties of the type. */
14533 base_type = check_typedef (orig_base_type);
14535 /* The die_type call above may have already set the type for this DIE. */
14536 range_type = get_die_type (die, cu);
14540 low.kind = PROP_CONST;
14541 high.kind = PROP_CONST;
14542 high.data.const_val = 0;
14544 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
14545 omitting DW_AT_lower_bound. */
14546 switch (cu->language)
14549 case language_cplus:
14550 low.data.const_val = 0;
14551 low_default_is_valid = 1;
14553 case language_fortran:
14554 low.data.const_val = 1;
14555 low_default_is_valid = 1;
14558 case language_java:
14559 case language_objc:
14560 low.data.const_val = 0;
14561 low_default_is_valid = (cu->header.version >= 4);
14565 case language_pascal:
14566 low.data.const_val = 1;
14567 low_default_is_valid = (cu->header.version >= 4);
14570 low.data.const_val = 0;
14571 low_default_is_valid = 0;
14575 /* FIXME: For variable sized arrays either of these could be
14576 a variable rather than a constant value. We'll allow it,
14577 but we don't know how to handle it. */
14578 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
14581 = dwarf2_get_attr_constant_value (attr, low.data.const_val);
14582 else if (!low_default_is_valid)
14583 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
14584 "- DIE at 0x%x [in module %s]"),
14585 die->offset.sect_off, objfile_name (cu->objfile));
14587 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
14588 if (!attr_to_dynamic_prop (attr, die, cu, &high))
14590 attr = dwarf2_attr (die, DW_AT_count, cu);
14591 if (attr_to_dynamic_prop (attr, die, cu, &high))
14593 /* If bounds are constant do the final calculation here. */
14594 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
14595 high.data.const_val = low.data.const_val + high.data.const_val - 1;
14597 high_bound_is_count = 1;
14601 /* Dwarf-2 specifications explicitly allows to create subrange types
14602 without specifying a base type.
14603 In that case, the base type must be set to the type of
14604 the lower bound, upper bound or count, in that order, if any of these
14605 three attributes references an object that has a type.
14606 If no base type is found, the Dwarf-2 specifications say that
14607 a signed integer type of size equal to the size of an address should
14609 For the following C code: `extern char gdb_int [];'
14610 GCC produces an empty range DIE.
14611 FIXME: muller/2010-05-28: Possible references to object for low bound,
14612 high bound or count are not yet handled by this code. */
14613 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
14615 struct objfile *objfile = cu->objfile;
14616 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14617 int addr_size = gdbarch_addr_bit (gdbarch) /8;
14618 struct type *int_type = objfile_type (objfile)->builtin_int;
14620 /* Test "int", "long int", and "long long int" objfile types,
14621 and select the first one having a size above or equal to the
14622 architecture address size. */
14623 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14624 base_type = int_type;
14627 int_type = objfile_type (objfile)->builtin_long;
14628 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14629 base_type = int_type;
14632 int_type = objfile_type (objfile)->builtin_long_long;
14633 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14634 base_type = int_type;
14639 /* Normally, the DWARF producers are expected to use a signed
14640 constant form (Eg. DW_FORM_sdata) to express negative bounds.
14641 But this is unfortunately not always the case, as witnessed
14642 with GCC, for instance, where the ambiguous DW_FORM_dataN form
14643 is used instead. To work around that ambiguity, we treat
14644 the bounds as signed, and thus sign-extend their values, when
14645 the base type is signed. */
14647 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
14648 if (low.kind == PROP_CONST
14649 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
14650 low.data.const_val |= negative_mask;
14651 if (high.kind == PROP_CONST
14652 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
14653 high.data.const_val |= negative_mask;
14655 range_type = create_range_type (NULL, orig_base_type, &low, &high);
14657 if (high_bound_is_count)
14658 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
14660 /* Ada expects an empty array on no boundary attributes. */
14661 if (attr == NULL && cu->language != language_ada)
14662 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
14664 name = dwarf2_name (die, cu);
14666 TYPE_NAME (range_type) = name;
14668 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14670 TYPE_LENGTH (range_type) = DW_UNSND (attr);
14672 set_die_type (die, range_type, cu);
14674 /* set_die_type should be already done. */
14675 set_descriptive_type (range_type, die, cu);
14680 static struct type *
14681 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
14685 /* For now, we only support the C meaning of an unspecified type: void. */
14687 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
14688 TYPE_NAME (type) = dwarf2_name (die, cu);
14690 return set_die_type (die, type, cu);
14693 /* Read a single die and all its descendents. Set the die's sibling
14694 field to NULL; set other fields in the die correctly, and set all
14695 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
14696 location of the info_ptr after reading all of those dies. PARENT
14697 is the parent of the die in question. */
14699 static struct die_info *
14700 read_die_and_children (const struct die_reader_specs *reader,
14701 const gdb_byte *info_ptr,
14702 const gdb_byte **new_info_ptr,
14703 struct die_info *parent)
14705 struct die_info *die;
14706 const gdb_byte *cur_ptr;
14709 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
14712 *new_info_ptr = cur_ptr;
14715 store_in_ref_table (die, reader->cu);
14718 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
14722 *new_info_ptr = cur_ptr;
14725 die->sibling = NULL;
14726 die->parent = parent;
14730 /* Read a die, all of its descendents, and all of its siblings; set
14731 all of the fields of all of the dies correctly. Arguments are as
14732 in read_die_and_children. */
14734 static struct die_info *
14735 read_die_and_siblings_1 (const struct die_reader_specs *reader,
14736 const gdb_byte *info_ptr,
14737 const gdb_byte **new_info_ptr,
14738 struct die_info *parent)
14740 struct die_info *first_die, *last_sibling;
14741 const gdb_byte *cur_ptr;
14743 cur_ptr = info_ptr;
14744 first_die = last_sibling = NULL;
14748 struct die_info *die
14749 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
14753 *new_info_ptr = cur_ptr;
14760 last_sibling->sibling = die;
14762 last_sibling = die;
14766 /* Read a die, all of its descendents, and all of its siblings; set
14767 all of the fields of all of the dies correctly. Arguments are as
14768 in read_die_and_children.
14769 This the main entry point for reading a DIE and all its children. */
14771 static struct die_info *
14772 read_die_and_siblings (const struct die_reader_specs *reader,
14773 const gdb_byte *info_ptr,
14774 const gdb_byte **new_info_ptr,
14775 struct die_info *parent)
14777 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
14778 new_info_ptr, parent);
14780 if (dwarf2_die_debug)
14782 fprintf_unfiltered (gdb_stdlog,
14783 "Read die from %s@0x%x of %s:\n",
14784 get_section_name (reader->die_section),
14785 (unsigned) (info_ptr - reader->die_section->buffer),
14786 bfd_get_filename (reader->abfd));
14787 dump_die (die, dwarf2_die_debug);
14793 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
14795 The caller is responsible for filling in the extra attributes
14796 and updating (*DIEP)->num_attrs.
14797 Set DIEP to point to a newly allocated die with its information,
14798 except for its child, sibling, and parent fields.
14799 Set HAS_CHILDREN to tell whether the die has children or not. */
14801 static const gdb_byte *
14802 read_full_die_1 (const struct die_reader_specs *reader,
14803 struct die_info **diep, const gdb_byte *info_ptr,
14804 int *has_children, int num_extra_attrs)
14806 unsigned int abbrev_number, bytes_read, i;
14807 sect_offset offset;
14808 struct abbrev_info *abbrev;
14809 struct die_info *die;
14810 struct dwarf2_cu *cu = reader->cu;
14811 bfd *abfd = reader->abfd;
14813 offset.sect_off = info_ptr - reader->buffer;
14814 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14815 info_ptr += bytes_read;
14816 if (!abbrev_number)
14823 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
14825 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
14827 bfd_get_filename (abfd));
14829 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
14830 die->offset = offset;
14831 die->tag = abbrev->tag;
14832 die->abbrev = abbrev_number;
14834 /* Make the result usable.
14835 The caller needs to update num_attrs after adding the extra
14837 die->num_attrs = abbrev->num_attrs;
14839 for (i = 0; i < abbrev->num_attrs; ++i)
14840 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
14844 *has_children = abbrev->has_children;
14848 /* Read a die and all its attributes.
14849 Set DIEP to point to a newly allocated die with its information,
14850 except for its child, sibling, and parent fields.
14851 Set HAS_CHILDREN to tell whether the die has children or not. */
14853 static const gdb_byte *
14854 read_full_die (const struct die_reader_specs *reader,
14855 struct die_info **diep, const gdb_byte *info_ptr,
14858 const gdb_byte *result;
14860 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
14862 if (dwarf2_die_debug)
14864 fprintf_unfiltered (gdb_stdlog,
14865 "Read die from %s@0x%x of %s:\n",
14866 get_section_name (reader->die_section),
14867 (unsigned) (info_ptr - reader->die_section->buffer),
14868 bfd_get_filename (reader->abfd));
14869 dump_die (*diep, dwarf2_die_debug);
14875 /* Abbreviation tables.
14877 In DWARF version 2, the description of the debugging information is
14878 stored in a separate .debug_abbrev section. Before we read any
14879 dies from a section we read in all abbreviations and install them
14880 in a hash table. */
14882 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
14884 static struct abbrev_info *
14885 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
14887 struct abbrev_info *abbrev;
14889 abbrev = (struct abbrev_info *)
14890 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
14891 memset (abbrev, 0, sizeof (struct abbrev_info));
14895 /* Add an abbreviation to the table. */
14898 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
14899 unsigned int abbrev_number,
14900 struct abbrev_info *abbrev)
14902 unsigned int hash_number;
14904 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14905 abbrev->next = abbrev_table->abbrevs[hash_number];
14906 abbrev_table->abbrevs[hash_number] = abbrev;
14909 /* Look up an abbrev in the table.
14910 Returns NULL if the abbrev is not found. */
14912 static struct abbrev_info *
14913 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
14914 unsigned int abbrev_number)
14916 unsigned int hash_number;
14917 struct abbrev_info *abbrev;
14919 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14920 abbrev = abbrev_table->abbrevs[hash_number];
14924 if (abbrev->number == abbrev_number)
14926 abbrev = abbrev->next;
14931 /* Read in an abbrev table. */
14933 static struct abbrev_table *
14934 abbrev_table_read_table (struct dwarf2_section_info *section,
14935 sect_offset offset)
14937 struct objfile *objfile = dwarf2_per_objfile->objfile;
14938 bfd *abfd = get_section_bfd_owner (section);
14939 struct abbrev_table *abbrev_table;
14940 const gdb_byte *abbrev_ptr;
14941 struct abbrev_info *cur_abbrev;
14942 unsigned int abbrev_number, bytes_read, abbrev_name;
14943 unsigned int abbrev_form;
14944 struct attr_abbrev *cur_attrs;
14945 unsigned int allocated_attrs;
14947 abbrev_table = XNEW (struct abbrev_table);
14948 abbrev_table->offset = offset;
14949 obstack_init (&abbrev_table->abbrev_obstack);
14950 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
14952 * sizeof (struct abbrev_info *)));
14953 memset (abbrev_table->abbrevs, 0,
14954 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
14956 dwarf2_read_section (objfile, section);
14957 abbrev_ptr = section->buffer + offset.sect_off;
14958 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14959 abbrev_ptr += bytes_read;
14961 allocated_attrs = ATTR_ALLOC_CHUNK;
14962 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
14964 /* Loop until we reach an abbrev number of 0. */
14965 while (abbrev_number)
14967 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
14969 /* read in abbrev header */
14970 cur_abbrev->number = abbrev_number;
14971 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14972 abbrev_ptr += bytes_read;
14973 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
14976 /* now read in declarations */
14977 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14978 abbrev_ptr += bytes_read;
14979 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14980 abbrev_ptr += bytes_read;
14981 while (abbrev_name)
14983 if (cur_abbrev->num_attrs == allocated_attrs)
14985 allocated_attrs += ATTR_ALLOC_CHUNK;
14987 = xrealloc (cur_attrs, (allocated_attrs
14988 * sizeof (struct attr_abbrev)));
14991 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
14992 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
14993 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14994 abbrev_ptr += bytes_read;
14995 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14996 abbrev_ptr += bytes_read;
14999 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
15000 (cur_abbrev->num_attrs
15001 * sizeof (struct attr_abbrev)));
15002 memcpy (cur_abbrev->attrs, cur_attrs,
15003 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15005 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15007 /* Get next abbreviation.
15008 Under Irix6 the abbreviations for a compilation unit are not
15009 always properly terminated with an abbrev number of 0.
15010 Exit loop if we encounter an abbreviation which we have
15011 already read (which means we are about to read the abbreviations
15012 for the next compile unit) or if the end of the abbreviation
15013 table is reached. */
15014 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15016 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15017 abbrev_ptr += bytes_read;
15018 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15023 return abbrev_table;
15026 /* Free the resources held by ABBREV_TABLE. */
15029 abbrev_table_free (struct abbrev_table *abbrev_table)
15031 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15032 xfree (abbrev_table);
15035 /* Same as abbrev_table_free but as a cleanup.
15036 We pass in a pointer to the pointer to the table so that we can
15037 set the pointer to NULL when we're done. It also simplifies
15038 build_type_unit_groups. */
15041 abbrev_table_free_cleanup (void *table_ptr)
15043 struct abbrev_table **abbrev_table_ptr = table_ptr;
15045 if (*abbrev_table_ptr != NULL)
15046 abbrev_table_free (*abbrev_table_ptr);
15047 *abbrev_table_ptr = NULL;
15050 /* Read the abbrev table for CU from ABBREV_SECTION. */
15053 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15054 struct dwarf2_section_info *abbrev_section)
15057 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
15060 /* Release the memory used by the abbrev table for a compilation unit. */
15063 dwarf2_free_abbrev_table (void *ptr_to_cu)
15065 struct dwarf2_cu *cu = ptr_to_cu;
15067 if (cu->abbrev_table != NULL)
15068 abbrev_table_free (cu->abbrev_table);
15069 /* Set this to NULL so that we SEGV if we try to read it later,
15070 and also because free_comp_unit verifies this is NULL. */
15071 cu->abbrev_table = NULL;
15074 /* Returns nonzero if TAG represents a type that we might generate a partial
15078 is_type_tag_for_partial (int tag)
15083 /* Some types that would be reasonable to generate partial symbols for,
15084 that we don't at present. */
15085 case DW_TAG_array_type:
15086 case DW_TAG_file_type:
15087 case DW_TAG_ptr_to_member_type:
15088 case DW_TAG_set_type:
15089 case DW_TAG_string_type:
15090 case DW_TAG_subroutine_type:
15092 case DW_TAG_base_type:
15093 case DW_TAG_class_type:
15094 case DW_TAG_interface_type:
15095 case DW_TAG_enumeration_type:
15096 case DW_TAG_structure_type:
15097 case DW_TAG_subrange_type:
15098 case DW_TAG_typedef:
15099 case DW_TAG_union_type:
15106 /* Load all DIEs that are interesting for partial symbols into memory. */
15108 static struct partial_die_info *
15109 load_partial_dies (const struct die_reader_specs *reader,
15110 const gdb_byte *info_ptr, int building_psymtab)
15112 struct dwarf2_cu *cu = reader->cu;
15113 struct objfile *objfile = cu->objfile;
15114 struct partial_die_info *part_die;
15115 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15116 struct abbrev_info *abbrev;
15117 unsigned int bytes_read;
15118 unsigned int load_all = 0;
15119 int nesting_level = 1;
15124 gdb_assert (cu->per_cu != NULL);
15125 if (cu->per_cu->load_all_dies)
15129 = htab_create_alloc_ex (cu->header.length / 12,
15133 &cu->comp_unit_obstack,
15134 hashtab_obstack_allocate,
15135 dummy_obstack_deallocate);
15137 part_die = obstack_alloc (&cu->comp_unit_obstack,
15138 sizeof (struct partial_die_info));
15142 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15144 /* A NULL abbrev means the end of a series of children. */
15145 if (abbrev == NULL)
15147 if (--nesting_level == 0)
15149 /* PART_DIE was probably the last thing allocated on the
15150 comp_unit_obstack, so we could call obstack_free
15151 here. We don't do that because the waste is small,
15152 and will be cleaned up when we're done with this
15153 compilation unit. This way, we're also more robust
15154 against other users of the comp_unit_obstack. */
15157 info_ptr += bytes_read;
15158 last_die = parent_die;
15159 parent_die = parent_die->die_parent;
15163 /* Check for template arguments. We never save these; if
15164 they're seen, we just mark the parent, and go on our way. */
15165 if (parent_die != NULL
15166 && cu->language == language_cplus
15167 && (abbrev->tag == DW_TAG_template_type_param
15168 || abbrev->tag == DW_TAG_template_value_param))
15170 parent_die->has_template_arguments = 1;
15174 /* We don't need a partial DIE for the template argument. */
15175 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15180 /* We only recurse into c++ subprograms looking for template arguments.
15181 Skip their other children. */
15183 && cu->language == language_cplus
15184 && parent_die != NULL
15185 && parent_die->tag == DW_TAG_subprogram)
15187 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15191 /* Check whether this DIE is interesting enough to save. Normally
15192 we would not be interested in members here, but there may be
15193 later variables referencing them via DW_AT_specification (for
15194 static members). */
15196 && !is_type_tag_for_partial (abbrev->tag)
15197 && abbrev->tag != DW_TAG_constant
15198 && abbrev->tag != DW_TAG_enumerator
15199 && abbrev->tag != DW_TAG_subprogram
15200 && abbrev->tag != DW_TAG_lexical_block
15201 && abbrev->tag != DW_TAG_variable
15202 && abbrev->tag != DW_TAG_namespace
15203 && abbrev->tag != DW_TAG_module
15204 && abbrev->tag != DW_TAG_member
15205 && abbrev->tag != DW_TAG_imported_unit
15206 && abbrev->tag != DW_TAG_imported_declaration)
15208 /* Otherwise we skip to the next sibling, if any. */
15209 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15213 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
15216 /* This two-pass algorithm for processing partial symbols has a
15217 high cost in cache pressure. Thus, handle some simple cases
15218 here which cover the majority of C partial symbols. DIEs
15219 which neither have specification tags in them, nor could have
15220 specification tags elsewhere pointing at them, can simply be
15221 processed and discarded.
15223 This segment is also optional; scan_partial_symbols and
15224 add_partial_symbol will handle these DIEs if we chain
15225 them in normally. When compilers which do not emit large
15226 quantities of duplicate debug information are more common,
15227 this code can probably be removed. */
15229 /* Any complete simple types at the top level (pretty much all
15230 of them, for a language without namespaces), can be processed
15232 if (parent_die == NULL
15233 && part_die->has_specification == 0
15234 && part_die->is_declaration == 0
15235 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
15236 || part_die->tag == DW_TAG_base_type
15237 || part_die->tag == DW_TAG_subrange_type))
15239 if (building_psymtab && part_die->name != NULL)
15240 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15241 VAR_DOMAIN, LOC_TYPEDEF,
15242 &objfile->static_psymbols,
15243 0, (CORE_ADDR) 0, cu->language, objfile);
15244 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15248 /* The exception for DW_TAG_typedef with has_children above is
15249 a workaround of GCC PR debug/47510. In the case of this complaint
15250 type_name_no_tag_or_error will error on such types later.
15252 GDB skipped children of DW_TAG_typedef by the shortcut above and then
15253 it could not find the child DIEs referenced later, this is checked
15254 above. In correct DWARF DW_TAG_typedef should have no children. */
15256 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
15257 complaint (&symfile_complaints,
15258 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
15259 "- DIE at 0x%x [in module %s]"),
15260 part_die->offset.sect_off, objfile_name (objfile));
15262 /* If we're at the second level, and we're an enumerator, and
15263 our parent has no specification (meaning possibly lives in a
15264 namespace elsewhere), then we can add the partial symbol now
15265 instead of queueing it. */
15266 if (part_die->tag == DW_TAG_enumerator
15267 && parent_die != NULL
15268 && parent_die->die_parent == NULL
15269 && parent_die->tag == DW_TAG_enumeration_type
15270 && parent_die->has_specification == 0)
15272 if (part_die->name == NULL)
15273 complaint (&symfile_complaints,
15274 _("malformed enumerator DIE ignored"));
15275 else if (building_psymtab)
15276 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15277 VAR_DOMAIN, LOC_CONST,
15278 (cu->language == language_cplus
15279 || cu->language == language_java)
15280 ? &objfile->global_psymbols
15281 : &objfile->static_psymbols,
15282 0, (CORE_ADDR) 0, cu->language, objfile);
15284 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15288 /* We'll save this DIE so link it in. */
15289 part_die->die_parent = parent_die;
15290 part_die->die_sibling = NULL;
15291 part_die->die_child = NULL;
15293 if (last_die && last_die == parent_die)
15294 last_die->die_child = part_die;
15296 last_die->die_sibling = part_die;
15298 last_die = part_die;
15300 if (first_die == NULL)
15301 first_die = part_die;
15303 /* Maybe add the DIE to the hash table. Not all DIEs that we
15304 find interesting need to be in the hash table, because we
15305 also have the parent/sibling/child chains; only those that we
15306 might refer to by offset later during partial symbol reading.
15308 For now this means things that might have be the target of a
15309 DW_AT_specification, DW_AT_abstract_origin, or
15310 DW_AT_extension. DW_AT_extension will refer only to
15311 namespaces; DW_AT_abstract_origin refers to functions (and
15312 many things under the function DIE, but we do not recurse
15313 into function DIEs during partial symbol reading) and
15314 possibly variables as well; DW_AT_specification refers to
15315 declarations. Declarations ought to have the DW_AT_declaration
15316 flag. It happens that GCC forgets to put it in sometimes, but
15317 only for functions, not for types.
15319 Adding more things than necessary to the hash table is harmless
15320 except for the performance cost. Adding too few will result in
15321 wasted time in find_partial_die, when we reread the compilation
15322 unit with load_all_dies set. */
15325 || abbrev->tag == DW_TAG_constant
15326 || abbrev->tag == DW_TAG_subprogram
15327 || abbrev->tag == DW_TAG_variable
15328 || abbrev->tag == DW_TAG_namespace
15329 || part_die->is_declaration)
15333 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
15334 part_die->offset.sect_off, INSERT);
15338 part_die = obstack_alloc (&cu->comp_unit_obstack,
15339 sizeof (struct partial_die_info));
15341 /* For some DIEs we want to follow their children (if any). For C
15342 we have no reason to follow the children of structures; for other
15343 languages we have to, so that we can get at method physnames
15344 to infer fully qualified class names, for DW_AT_specification,
15345 and for C++ template arguments. For C++, we also look one level
15346 inside functions to find template arguments (if the name of the
15347 function does not already contain the template arguments).
15349 For Ada, we need to scan the children of subprograms and lexical
15350 blocks as well because Ada allows the definition of nested
15351 entities that could be interesting for the debugger, such as
15352 nested subprograms for instance. */
15353 if (last_die->has_children
15355 || last_die->tag == DW_TAG_namespace
15356 || last_die->tag == DW_TAG_module
15357 || last_die->tag == DW_TAG_enumeration_type
15358 || (cu->language == language_cplus
15359 && last_die->tag == DW_TAG_subprogram
15360 && (last_die->name == NULL
15361 || strchr (last_die->name, '<') == NULL))
15362 || (cu->language != language_c
15363 && (last_die->tag == DW_TAG_class_type
15364 || last_die->tag == DW_TAG_interface_type
15365 || last_die->tag == DW_TAG_structure_type
15366 || last_die->tag == DW_TAG_union_type))
15367 || (cu->language == language_ada
15368 && (last_die->tag == DW_TAG_subprogram
15369 || last_die->tag == DW_TAG_lexical_block))))
15372 parent_die = last_die;
15376 /* Otherwise we skip to the next sibling, if any. */
15377 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
15379 /* Back to the top, do it again. */
15383 /* Read a minimal amount of information into the minimal die structure. */
15385 static const gdb_byte *
15386 read_partial_die (const struct die_reader_specs *reader,
15387 struct partial_die_info *part_die,
15388 struct abbrev_info *abbrev, unsigned int abbrev_len,
15389 const gdb_byte *info_ptr)
15391 struct dwarf2_cu *cu = reader->cu;
15392 struct objfile *objfile = cu->objfile;
15393 const gdb_byte *buffer = reader->buffer;
15395 struct attribute attr;
15396 int has_low_pc_attr = 0;
15397 int has_high_pc_attr = 0;
15398 int high_pc_relative = 0;
15400 memset (part_die, 0, sizeof (struct partial_die_info));
15402 part_die->offset.sect_off = info_ptr - buffer;
15404 info_ptr += abbrev_len;
15406 if (abbrev == NULL)
15409 part_die->tag = abbrev->tag;
15410 part_die->has_children = abbrev->has_children;
15412 for (i = 0; i < abbrev->num_attrs; ++i)
15414 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
15416 /* Store the data if it is of an attribute we want to keep in a
15417 partial symbol table. */
15421 switch (part_die->tag)
15423 case DW_TAG_compile_unit:
15424 case DW_TAG_partial_unit:
15425 case DW_TAG_type_unit:
15426 /* Compilation units have a DW_AT_name that is a filename, not
15427 a source language identifier. */
15428 case DW_TAG_enumeration_type:
15429 case DW_TAG_enumerator:
15430 /* These tags always have simple identifiers already; no need
15431 to canonicalize them. */
15432 part_die->name = DW_STRING (&attr);
15436 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
15437 &objfile->objfile_obstack);
15441 case DW_AT_linkage_name:
15442 case DW_AT_MIPS_linkage_name:
15443 /* Note that both forms of linkage name might appear. We
15444 assume they will be the same, and we only store the last
15446 if (cu->language == language_ada)
15447 part_die->name = DW_STRING (&attr);
15448 part_die->linkage_name = DW_STRING (&attr);
15451 has_low_pc_attr = 1;
15452 part_die->lowpc = attr_value_as_address (&attr);
15454 case DW_AT_high_pc:
15455 has_high_pc_attr = 1;
15456 part_die->highpc = attr_value_as_address (&attr);
15457 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
15458 high_pc_relative = 1;
15460 case DW_AT_location:
15461 /* Support the .debug_loc offsets. */
15462 if (attr_form_is_block (&attr))
15464 part_die->d.locdesc = DW_BLOCK (&attr);
15466 else if (attr_form_is_section_offset (&attr))
15468 dwarf2_complex_location_expr_complaint ();
15472 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15473 "partial symbol information");
15476 case DW_AT_external:
15477 part_die->is_external = DW_UNSND (&attr);
15479 case DW_AT_declaration:
15480 part_die->is_declaration = DW_UNSND (&attr);
15483 part_die->has_type = 1;
15485 case DW_AT_abstract_origin:
15486 case DW_AT_specification:
15487 case DW_AT_extension:
15488 part_die->has_specification = 1;
15489 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
15490 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15491 || cu->per_cu->is_dwz);
15493 case DW_AT_sibling:
15494 /* Ignore absolute siblings, they might point outside of
15495 the current compile unit. */
15496 if (attr.form == DW_FORM_ref_addr)
15497 complaint (&symfile_complaints,
15498 _("ignoring absolute DW_AT_sibling"));
15501 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
15502 const gdb_byte *sibling_ptr = buffer + off;
15504 if (sibling_ptr < info_ptr)
15505 complaint (&symfile_complaints,
15506 _("DW_AT_sibling points backwards"));
15507 else if (sibling_ptr > reader->buffer_end)
15508 dwarf2_section_buffer_overflow_complaint (reader->die_section);
15510 part_die->sibling = sibling_ptr;
15513 case DW_AT_byte_size:
15514 part_die->has_byte_size = 1;
15516 case DW_AT_calling_convention:
15517 /* DWARF doesn't provide a way to identify a program's source-level
15518 entry point. DW_AT_calling_convention attributes are only meant
15519 to describe functions' calling conventions.
15521 However, because it's a necessary piece of information in
15522 Fortran, and because DW_CC_program is the only piece of debugging
15523 information whose definition refers to a 'main program' at all,
15524 several compilers have begun marking Fortran main programs with
15525 DW_CC_program --- even when those functions use the standard
15526 calling conventions.
15528 So until DWARF specifies a way to provide this information and
15529 compilers pick up the new representation, we'll support this
15531 if (DW_UNSND (&attr) == DW_CC_program
15532 && cu->language == language_fortran)
15533 set_objfile_main_name (objfile, part_die->name, language_fortran);
15536 if (DW_UNSND (&attr) == DW_INL_inlined
15537 || DW_UNSND (&attr) == DW_INL_declared_inlined)
15538 part_die->may_be_inlined = 1;
15542 if (part_die->tag == DW_TAG_imported_unit)
15544 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
15545 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15546 || cu->per_cu->is_dwz);
15555 if (high_pc_relative)
15556 part_die->highpc += part_die->lowpc;
15558 if (has_low_pc_attr && has_high_pc_attr)
15560 /* When using the GNU linker, .gnu.linkonce. sections are used to
15561 eliminate duplicate copies of functions and vtables and such.
15562 The linker will arbitrarily choose one and discard the others.
15563 The AT_*_pc values for such functions refer to local labels in
15564 these sections. If the section from that file was discarded, the
15565 labels are not in the output, so the relocs get a value of 0.
15566 If this is a discarded function, mark the pc bounds as invalid,
15567 so that GDB will ignore it. */
15568 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
15570 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15572 complaint (&symfile_complaints,
15573 _("DW_AT_low_pc %s is zero "
15574 "for DIE at 0x%x [in module %s]"),
15575 paddress (gdbarch, part_die->lowpc),
15576 part_die->offset.sect_off, objfile_name (objfile));
15578 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
15579 else if (part_die->lowpc >= part_die->highpc)
15581 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15583 complaint (&symfile_complaints,
15584 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
15585 "for DIE at 0x%x [in module %s]"),
15586 paddress (gdbarch, part_die->lowpc),
15587 paddress (gdbarch, part_die->highpc),
15588 part_die->offset.sect_off, objfile_name (objfile));
15591 part_die->has_pc_info = 1;
15597 /* Find a cached partial DIE at OFFSET in CU. */
15599 static struct partial_die_info *
15600 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
15602 struct partial_die_info *lookup_die = NULL;
15603 struct partial_die_info part_die;
15605 part_die.offset = offset;
15606 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
15612 /* Find a partial DIE at OFFSET, which may or may not be in CU,
15613 except in the case of .debug_types DIEs which do not reference
15614 outside their CU (they do however referencing other types via
15615 DW_FORM_ref_sig8). */
15617 static struct partial_die_info *
15618 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
15620 struct objfile *objfile = cu->objfile;
15621 struct dwarf2_per_cu_data *per_cu = NULL;
15622 struct partial_die_info *pd = NULL;
15624 if (offset_in_dwz == cu->per_cu->is_dwz
15625 && offset_in_cu_p (&cu->header, offset))
15627 pd = find_partial_die_in_comp_unit (offset, cu);
15630 /* We missed recording what we needed.
15631 Load all dies and try again. */
15632 per_cu = cu->per_cu;
15636 /* TUs don't reference other CUs/TUs (except via type signatures). */
15637 if (cu->per_cu->is_debug_types)
15639 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
15640 " external reference to offset 0x%lx [in module %s].\n"),
15641 (long) cu->header.offset.sect_off, (long) offset.sect_off,
15642 bfd_get_filename (objfile->obfd));
15644 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
15647 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
15648 load_partial_comp_unit (per_cu);
15650 per_cu->cu->last_used = 0;
15651 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15654 /* If we didn't find it, and not all dies have been loaded,
15655 load them all and try again. */
15657 if (pd == NULL && per_cu->load_all_dies == 0)
15659 per_cu->load_all_dies = 1;
15661 /* This is nasty. When we reread the DIEs, somewhere up the call chain
15662 THIS_CU->cu may already be in use. So we can't just free it and
15663 replace its DIEs with the ones we read in. Instead, we leave those
15664 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
15665 and clobber THIS_CU->cu->partial_dies with the hash table for the new
15667 load_partial_comp_unit (per_cu);
15669 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15673 internal_error (__FILE__, __LINE__,
15674 _("could not find partial DIE 0x%x "
15675 "in cache [from module %s]\n"),
15676 offset.sect_off, bfd_get_filename (objfile->obfd));
15680 /* See if we can figure out if the class lives in a namespace. We do
15681 this by looking for a member function; its demangled name will
15682 contain namespace info, if there is any. */
15685 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
15686 struct dwarf2_cu *cu)
15688 /* NOTE: carlton/2003-10-07: Getting the info this way changes
15689 what template types look like, because the demangler
15690 frequently doesn't give the same name as the debug info. We
15691 could fix this by only using the demangled name to get the
15692 prefix (but see comment in read_structure_type). */
15694 struct partial_die_info *real_pdi;
15695 struct partial_die_info *child_pdi;
15697 /* If this DIE (this DIE's specification, if any) has a parent, then
15698 we should not do this. We'll prepend the parent's fully qualified
15699 name when we create the partial symbol. */
15701 real_pdi = struct_pdi;
15702 while (real_pdi->has_specification)
15703 real_pdi = find_partial_die (real_pdi->spec_offset,
15704 real_pdi->spec_is_dwz, cu);
15706 if (real_pdi->die_parent != NULL)
15709 for (child_pdi = struct_pdi->die_child;
15711 child_pdi = child_pdi->die_sibling)
15713 if (child_pdi->tag == DW_TAG_subprogram
15714 && child_pdi->linkage_name != NULL)
15716 char *actual_class_name
15717 = language_class_name_from_physname (cu->language_defn,
15718 child_pdi->linkage_name);
15719 if (actual_class_name != NULL)
15722 = obstack_copy0 (&cu->objfile->objfile_obstack,
15724 strlen (actual_class_name));
15725 xfree (actual_class_name);
15732 /* Adjust PART_DIE before generating a symbol for it. This function
15733 may set the is_external flag or change the DIE's name. */
15736 fixup_partial_die (struct partial_die_info *part_die,
15737 struct dwarf2_cu *cu)
15739 /* Once we've fixed up a die, there's no point in doing so again.
15740 This also avoids a memory leak if we were to call
15741 guess_partial_die_structure_name multiple times. */
15742 if (part_die->fixup_called)
15745 /* If we found a reference attribute and the DIE has no name, try
15746 to find a name in the referred to DIE. */
15748 if (part_die->name == NULL && part_die->has_specification)
15750 struct partial_die_info *spec_die;
15752 spec_die = find_partial_die (part_die->spec_offset,
15753 part_die->spec_is_dwz, cu);
15755 fixup_partial_die (spec_die, cu);
15757 if (spec_die->name)
15759 part_die->name = spec_die->name;
15761 /* Copy DW_AT_external attribute if it is set. */
15762 if (spec_die->is_external)
15763 part_die->is_external = spec_die->is_external;
15767 /* Set default names for some unnamed DIEs. */
15769 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
15770 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
15772 /* If there is no parent die to provide a namespace, and there are
15773 children, see if we can determine the namespace from their linkage
15775 if (cu->language == language_cplus
15776 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
15777 && part_die->die_parent == NULL
15778 && part_die->has_children
15779 && (part_die->tag == DW_TAG_class_type
15780 || part_die->tag == DW_TAG_structure_type
15781 || part_die->tag == DW_TAG_union_type))
15782 guess_partial_die_structure_name (part_die, cu);
15784 /* GCC might emit a nameless struct or union that has a linkage
15785 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
15786 if (part_die->name == NULL
15787 && (part_die->tag == DW_TAG_class_type
15788 || part_die->tag == DW_TAG_interface_type
15789 || part_die->tag == DW_TAG_structure_type
15790 || part_die->tag == DW_TAG_union_type)
15791 && part_die->linkage_name != NULL)
15795 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
15800 /* Strip any leading namespaces/classes, keep only the base name.
15801 DW_AT_name for named DIEs does not contain the prefixes. */
15802 base = strrchr (demangled, ':');
15803 if (base && base > demangled && base[-1] == ':')
15808 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
15809 base, strlen (base));
15814 part_die->fixup_called = 1;
15817 /* Read an attribute value described by an attribute form. */
15819 static const gdb_byte *
15820 read_attribute_value (const struct die_reader_specs *reader,
15821 struct attribute *attr, unsigned form,
15822 const gdb_byte *info_ptr)
15824 struct dwarf2_cu *cu = reader->cu;
15825 bfd *abfd = reader->abfd;
15826 struct comp_unit_head *cu_header = &cu->header;
15827 unsigned int bytes_read;
15828 struct dwarf_block *blk;
15833 case DW_FORM_ref_addr:
15834 if (cu->header.version == 2)
15835 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15837 DW_UNSND (attr) = read_offset (abfd, info_ptr,
15838 &cu->header, &bytes_read);
15839 info_ptr += bytes_read;
15841 case DW_FORM_GNU_ref_alt:
15842 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15843 info_ptr += bytes_read;
15846 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15847 info_ptr += bytes_read;
15849 case DW_FORM_block2:
15850 blk = dwarf_alloc_block (cu);
15851 blk->size = read_2_bytes (abfd, info_ptr);
15853 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15854 info_ptr += blk->size;
15855 DW_BLOCK (attr) = blk;
15857 case DW_FORM_block4:
15858 blk = dwarf_alloc_block (cu);
15859 blk->size = read_4_bytes (abfd, info_ptr);
15861 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15862 info_ptr += blk->size;
15863 DW_BLOCK (attr) = blk;
15865 case DW_FORM_data2:
15866 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
15869 case DW_FORM_data4:
15870 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
15873 case DW_FORM_data8:
15874 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
15877 case DW_FORM_sec_offset:
15878 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15879 info_ptr += bytes_read;
15881 case DW_FORM_string:
15882 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
15883 DW_STRING_IS_CANONICAL (attr) = 0;
15884 info_ptr += bytes_read;
15887 if (!cu->per_cu->is_dwz)
15889 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
15891 DW_STRING_IS_CANONICAL (attr) = 0;
15892 info_ptr += bytes_read;
15896 case DW_FORM_GNU_strp_alt:
15898 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15899 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
15902 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
15903 DW_STRING_IS_CANONICAL (attr) = 0;
15904 info_ptr += bytes_read;
15907 case DW_FORM_exprloc:
15908 case DW_FORM_block:
15909 blk = dwarf_alloc_block (cu);
15910 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15911 info_ptr += bytes_read;
15912 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15913 info_ptr += blk->size;
15914 DW_BLOCK (attr) = blk;
15916 case DW_FORM_block1:
15917 blk = dwarf_alloc_block (cu);
15918 blk->size = read_1_byte (abfd, info_ptr);
15920 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15921 info_ptr += blk->size;
15922 DW_BLOCK (attr) = blk;
15924 case DW_FORM_data1:
15925 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15929 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15932 case DW_FORM_flag_present:
15933 DW_UNSND (attr) = 1;
15935 case DW_FORM_sdata:
15936 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
15937 info_ptr += bytes_read;
15939 case DW_FORM_udata:
15940 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15941 info_ptr += bytes_read;
15944 DW_UNSND (attr) = (cu->header.offset.sect_off
15945 + read_1_byte (abfd, info_ptr));
15949 DW_UNSND (attr) = (cu->header.offset.sect_off
15950 + read_2_bytes (abfd, info_ptr));
15954 DW_UNSND (attr) = (cu->header.offset.sect_off
15955 + read_4_bytes (abfd, info_ptr));
15959 DW_UNSND (attr) = (cu->header.offset.sect_off
15960 + read_8_bytes (abfd, info_ptr));
15963 case DW_FORM_ref_sig8:
15964 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
15967 case DW_FORM_ref_udata:
15968 DW_UNSND (attr) = (cu->header.offset.sect_off
15969 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
15970 info_ptr += bytes_read;
15972 case DW_FORM_indirect:
15973 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15974 info_ptr += bytes_read;
15975 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
15977 case DW_FORM_GNU_addr_index:
15978 if (reader->dwo_file == NULL)
15980 /* For now flag a hard error.
15981 Later we can turn this into a complaint. */
15982 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15983 dwarf_form_name (form),
15984 bfd_get_filename (abfd));
15986 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
15987 info_ptr += bytes_read;
15989 case DW_FORM_GNU_str_index:
15990 if (reader->dwo_file == NULL)
15992 /* For now flag a hard error.
15993 Later we can turn this into a complaint if warranted. */
15994 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15995 dwarf_form_name (form),
15996 bfd_get_filename (abfd));
15999 ULONGEST str_index =
16000 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16002 DW_STRING (attr) = read_str_index (reader, str_index);
16003 DW_STRING_IS_CANONICAL (attr) = 0;
16004 info_ptr += bytes_read;
16008 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16009 dwarf_form_name (form),
16010 bfd_get_filename (abfd));
16014 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16015 attr->form = DW_FORM_GNU_ref_alt;
16017 /* We have seen instances where the compiler tried to emit a byte
16018 size attribute of -1 which ended up being encoded as an unsigned
16019 0xffffffff. Although 0xffffffff is technically a valid size value,
16020 an object of this size seems pretty unlikely so we can relatively
16021 safely treat these cases as if the size attribute was invalid and
16022 treat them as zero by default. */
16023 if (attr->name == DW_AT_byte_size
16024 && form == DW_FORM_data4
16025 && DW_UNSND (attr) >= 0xffffffff)
16028 (&symfile_complaints,
16029 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16030 hex_string (DW_UNSND (attr)));
16031 DW_UNSND (attr) = 0;
16037 /* Read an attribute described by an abbreviated attribute. */
16039 static const gdb_byte *
16040 read_attribute (const struct die_reader_specs *reader,
16041 struct attribute *attr, struct attr_abbrev *abbrev,
16042 const gdb_byte *info_ptr)
16044 attr->name = abbrev->name;
16045 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
16048 /* Read dwarf information from a buffer. */
16050 static unsigned int
16051 read_1_byte (bfd *abfd, const gdb_byte *buf)
16053 return bfd_get_8 (abfd, buf);
16057 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
16059 return bfd_get_signed_8 (abfd, buf);
16062 static unsigned int
16063 read_2_bytes (bfd *abfd, const gdb_byte *buf)
16065 return bfd_get_16 (abfd, buf);
16069 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16071 return bfd_get_signed_16 (abfd, buf);
16074 static unsigned int
16075 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16077 return bfd_get_32 (abfd, buf);
16081 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16083 return bfd_get_signed_32 (abfd, buf);
16087 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16089 return bfd_get_64 (abfd, buf);
16093 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16094 unsigned int *bytes_read)
16096 struct comp_unit_head *cu_header = &cu->header;
16097 CORE_ADDR retval = 0;
16099 if (cu_header->signed_addr_p)
16101 switch (cu_header->addr_size)
16104 retval = bfd_get_signed_16 (abfd, buf);
16107 retval = bfd_get_signed_32 (abfd, buf);
16110 retval = bfd_get_signed_64 (abfd, buf);
16113 internal_error (__FILE__, __LINE__,
16114 _("read_address: bad switch, signed [in module %s]"),
16115 bfd_get_filename (abfd));
16120 switch (cu_header->addr_size)
16123 retval = bfd_get_16 (abfd, buf);
16126 retval = bfd_get_32 (abfd, buf);
16129 retval = bfd_get_64 (abfd, buf);
16132 internal_error (__FILE__, __LINE__,
16133 _("read_address: bad switch, "
16134 "unsigned [in module %s]"),
16135 bfd_get_filename (abfd));
16139 *bytes_read = cu_header->addr_size;
16143 /* Read the initial length from a section. The (draft) DWARF 3
16144 specification allows the initial length to take up either 4 bytes
16145 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
16146 bytes describe the length and all offsets will be 8 bytes in length
16149 An older, non-standard 64-bit format is also handled by this
16150 function. The older format in question stores the initial length
16151 as an 8-byte quantity without an escape value. Lengths greater
16152 than 2^32 aren't very common which means that the initial 4 bytes
16153 is almost always zero. Since a length value of zero doesn't make
16154 sense for the 32-bit format, this initial zero can be considered to
16155 be an escape value which indicates the presence of the older 64-bit
16156 format. As written, the code can't detect (old format) lengths
16157 greater than 4GB. If it becomes necessary to handle lengths
16158 somewhat larger than 4GB, we could allow other small values (such
16159 as the non-sensical values of 1, 2, and 3) to also be used as
16160 escape values indicating the presence of the old format.
16162 The value returned via bytes_read should be used to increment the
16163 relevant pointer after calling read_initial_length().
16165 [ Note: read_initial_length() and read_offset() are based on the
16166 document entitled "DWARF Debugging Information Format", revision
16167 3, draft 8, dated November 19, 2001. This document was obtained
16170 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
16172 This document is only a draft and is subject to change. (So beware.)
16174 Details regarding the older, non-standard 64-bit format were
16175 determined empirically by examining 64-bit ELF files produced by
16176 the SGI toolchain on an IRIX 6.5 machine.
16178 - Kevin, July 16, 2002
16182 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
16184 LONGEST length = bfd_get_32 (abfd, buf);
16186 if (length == 0xffffffff)
16188 length = bfd_get_64 (abfd, buf + 4);
16191 else if (length == 0)
16193 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
16194 length = bfd_get_64 (abfd, buf);
16205 /* Cover function for read_initial_length.
16206 Returns the length of the object at BUF, and stores the size of the
16207 initial length in *BYTES_READ and stores the size that offsets will be in
16209 If the initial length size is not equivalent to that specified in
16210 CU_HEADER then issue a complaint.
16211 This is useful when reading non-comp-unit headers. */
16214 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
16215 const struct comp_unit_head *cu_header,
16216 unsigned int *bytes_read,
16217 unsigned int *offset_size)
16219 LONGEST length = read_initial_length (abfd, buf, bytes_read);
16221 gdb_assert (cu_header->initial_length_size == 4
16222 || cu_header->initial_length_size == 8
16223 || cu_header->initial_length_size == 12);
16225 if (cu_header->initial_length_size != *bytes_read)
16226 complaint (&symfile_complaints,
16227 _("intermixed 32-bit and 64-bit DWARF sections"));
16229 *offset_size = (*bytes_read == 4) ? 4 : 8;
16233 /* Read an offset from the data stream. The size of the offset is
16234 given by cu_header->offset_size. */
16237 read_offset (bfd *abfd, const gdb_byte *buf,
16238 const struct comp_unit_head *cu_header,
16239 unsigned int *bytes_read)
16241 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
16243 *bytes_read = cu_header->offset_size;
16247 /* Read an offset from the data stream. */
16250 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
16252 LONGEST retval = 0;
16254 switch (offset_size)
16257 retval = bfd_get_32 (abfd, buf);
16260 retval = bfd_get_64 (abfd, buf);
16263 internal_error (__FILE__, __LINE__,
16264 _("read_offset_1: bad switch [in module %s]"),
16265 bfd_get_filename (abfd));
16271 static const gdb_byte *
16272 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
16274 /* If the size of a host char is 8 bits, we can return a pointer
16275 to the buffer, otherwise we have to copy the data to a buffer
16276 allocated on the temporary obstack. */
16277 gdb_assert (HOST_CHAR_BIT == 8);
16281 static const char *
16282 read_direct_string (bfd *abfd, const gdb_byte *buf,
16283 unsigned int *bytes_read_ptr)
16285 /* If the size of a host char is 8 bits, we can return a pointer
16286 to the string, otherwise we have to copy the string to a buffer
16287 allocated on the temporary obstack. */
16288 gdb_assert (HOST_CHAR_BIT == 8);
16291 *bytes_read_ptr = 1;
16294 *bytes_read_ptr = strlen ((const char *) buf) + 1;
16295 return (const char *) buf;
16298 static const char *
16299 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
16301 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
16302 if (dwarf2_per_objfile->str.buffer == NULL)
16303 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
16304 bfd_get_filename (abfd));
16305 if (str_offset >= dwarf2_per_objfile->str.size)
16306 error (_("DW_FORM_strp pointing outside of "
16307 ".debug_str section [in module %s]"),
16308 bfd_get_filename (abfd));
16309 gdb_assert (HOST_CHAR_BIT == 8);
16310 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
16312 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
16315 /* Read a string at offset STR_OFFSET in the .debug_str section from
16316 the .dwz file DWZ. Throw an error if the offset is too large. If
16317 the string consists of a single NUL byte, return NULL; otherwise
16318 return a pointer to the string. */
16320 static const char *
16321 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
16323 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
16325 if (dwz->str.buffer == NULL)
16326 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
16327 "section [in module %s]"),
16328 bfd_get_filename (dwz->dwz_bfd));
16329 if (str_offset >= dwz->str.size)
16330 error (_("DW_FORM_GNU_strp_alt pointing outside of "
16331 ".debug_str section [in module %s]"),
16332 bfd_get_filename (dwz->dwz_bfd));
16333 gdb_assert (HOST_CHAR_BIT == 8);
16334 if (dwz->str.buffer[str_offset] == '\0')
16336 return (const char *) (dwz->str.buffer + str_offset);
16339 static const char *
16340 read_indirect_string (bfd *abfd, const gdb_byte *buf,
16341 const struct comp_unit_head *cu_header,
16342 unsigned int *bytes_read_ptr)
16344 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
16346 return read_indirect_string_at_offset (abfd, str_offset);
16350 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
16351 unsigned int *bytes_read_ptr)
16354 unsigned int num_read;
16356 unsigned char byte;
16364 byte = bfd_get_8 (abfd, buf);
16367 result |= ((ULONGEST) (byte & 127) << shift);
16368 if ((byte & 128) == 0)
16374 *bytes_read_ptr = num_read;
16379 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
16380 unsigned int *bytes_read_ptr)
16383 int i, shift, num_read;
16384 unsigned char byte;
16392 byte = bfd_get_8 (abfd, buf);
16395 result |= ((LONGEST) (byte & 127) << shift);
16397 if ((byte & 128) == 0)
16402 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
16403 result |= -(((LONGEST) 1) << shift);
16404 *bytes_read_ptr = num_read;
16408 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
16409 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
16410 ADDR_SIZE is the size of addresses from the CU header. */
16413 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
16415 struct objfile *objfile = dwarf2_per_objfile->objfile;
16416 bfd *abfd = objfile->obfd;
16417 const gdb_byte *info_ptr;
16419 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
16420 if (dwarf2_per_objfile->addr.buffer == NULL)
16421 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
16422 objfile_name (objfile));
16423 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
16424 error (_("DW_FORM_addr_index pointing outside of "
16425 ".debug_addr section [in module %s]"),
16426 objfile_name (objfile));
16427 info_ptr = (dwarf2_per_objfile->addr.buffer
16428 + addr_base + addr_index * addr_size);
16429 if (addr_size == 4)
16430 return bfd_get_32 (abfd, info_ptr);
16432 return bfd_get_64 (abfd, info_ptr);
16435 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
16438 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
16440 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
16443 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
16446 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
16447 unsigned int *bytes_read)
16449 bfd *abfd = cu->objfile->obfd;
16450 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
16452 return read_addr_index (cu, addr_index);
16455 /* Data structure to pass results from dwarf2_read_addr_index_reader
16456 back to dwarf2_read_addr_index. */
16458 struct dwarf2_read_addr_index_data
16460 ULONGEST addr_base;
16464 /* die_reader_func for dwarf2_read_addr_index. */
16467 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
16468 const gdb_byte *info_ptr,
16469 struct die_info *comp_unit_die,
16473 struct dwarf2_cu *cu = reader->cu;
16474 struct dwarf2_read_addr_index_data *aidata =
16475 (struct dwarf2_read_addr_index_data *) data;
16477 aidata->addr_base = cu->addr_base;
16478 aidata->addr_size = cu->header.addr_size;
16481 /* Given an index in .debug_addr, fetch the value.
16482 NOTE: This can be called during dwarf expression evaluation,
16483 long after the debug information has been read, and thus per_cu->cu
16484 may no longer exist. */
16487 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
16488 unsigned int addr_index)
16490 struct objfile *objfile = per_cu->objfile;
16491 struct dwarf2_cu *cu = per_cu->cu;
16492 ULONGEST addr_base;
16495 /* This is intended to be called from outside this file. */
16496 dw2_setup (objfile);
16498 /* We need addr_base and addr_size.
16499 If we don't have PER_CU->cu, we have to get it.
16500 Nasty, but the alternative is storing the needed info in PER_CU,
16501 which at this point doesn't seem justified: it's not clear how frequently
16502 it would get used and it would increase the size of every PER_CU.
16503 Entry points like dwarf2_per_cu_addr_size do a similar thing
16504 so we're not in uncharted territory here.
16505 Alas we need to be a bit more complicated as addr_base is contained
16508 We don't need to read the entire CU(/TU).
16509 We just need the header and top level die.
16511 IWBN to use the aging mechanism to let us lazily later discard the CU.
16512 For now we skip this optimization. */
16516 addr_base = cu->addr_base;
16517 addr_size = cu->header.addr_size;
16521 struct dwarf2_read_addr_index_data aidata;
16523 /* Note: We can't use init_cutu_and_read_dies_simple here,
16524 we need addr_base. */
16525 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
16526 dwarf2_read_addr_index_reader, &aidata);
16527 addr_base = aidata.addr_base;
16528 addr_size = aidata.addr_size;
16531 return read_addr_index_1 (addr_index, addr_base, addr_size);
16534 /* Given a DW_FORM_GNU_str_index, fetch the string.
16535 This is only used by the Fission support. */
16537 static const char *
16538 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
16540 struct objfile *objfile = dwarf2_per_objfile->objfile;
16541 const char *objf_name = objfile_name (objfile);
16542 bfd *abfd = objfile->obfd;
16543 struct dwarf2_cu *cu = reader->cu;
16544 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
16545 struct dwarf2_section_info *str_offsets_section =
16546 &reader->dwo_file->sections.str_offsets;
16547 const gdb_byte *info_ptr;
16548 ULONGEST str_offset;
16549 static const char form_name[] = "DW_FORM_GNU_str_index";
16551 dwarf2_read_section (objfile, str_section);
16552 dwarf2_read_section (objfile, str_offsets_section);
16553 if (str_section->buffer == NULL)
16554 error (_("%s used without .debug_str.dwo section"
16555 " in CU at offset 0x%lx [in module %s]"),
16556 form_name, (long) cu->header.offset.sect_off, objf_name);
16557 if (str_offsets_section->buffer == NULL)
16558 error (_("%s used without .debug_str_offsets.dwo section"
16559 " in CU at offset 0x%lx [in module %s]"),
16560 form_name, (long) cu->header.offset.sect_off, objf_name);
16561 if (str_index * cu->header.offset_size >= str_offsets_section->size)
16562 error (_("%s pointing outside of .debug_str_offsets.dwo"
16563 " section in CU at offset 0x%lx [in module %s]"),
16564 form_name, (long) cu->header.offset.sect_off, objf_name);
16565 info_ptr = (str_offsets_section->buffer
16566 + str_index * cu->header.offset_size);
16567 if (cu->header.offset_size == 4)
16568 str_offset = bfd_get_32 (abfd, info_ptr);
16570 str_offset = bfd_get_64 (abfd, info_ptr);
16571 if (str_offset >= str_section->size)
16572 error (_("Offset from %s pointing outside of"
16573 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
16574 form_name, (long) cu->header.offset.sect_off, objf_name);
16575 return (const char *) (str_section->buffer + str_offset);
16578 /* Return the length of an LEB128 number in BUF. */
16581 leb128_size (const gdb_byte *buf)
16583 const gdb_byte *begin = buf;
16589 if ((byte & 128) == 0)
16590 return buf - begin;
16595 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
16603 cu->language = language_c;
16605 case DW_LANG_C_plus_plus:
16606 cu->language = language_cplus;
16609 cu->language = language_d;
16611 case DW_LANG_Fortran77:
16612 case DW_LANG_Fortran90:
16613 case DW_LANG_Fortran95:
16614 cu->language = language_fortran;
16617 cu->language = language_go;
16619 case DW_LANG_Mips_Assembler:
16620 cu->language = language_asm;
16623 cu->language = language_java;
16625 case DW_LANG_Ada83:
16626 case DW_LANG_Ada95:
16627 cu->language = language_ada;
16629 case DW_LANG_Modula2:
16630 cu->language = language_m2;
16632 case DW_LANG_Pascal83:
16633 cu->language = language_pascal;
16636 cu->language = language_objc;
16638 case DW_LANG_Cobol74:
16639 case DW_LANG_Cobol85:
16641 cu->language = language_minimal;
16644 cu->language_defn = language_def (cu->language);
16647 /* Return the named attribute or NULL if not there. */
16649 static struct attribute *
16650 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
16655 struct attribute *spec = NULL;
16657 for (i = 0; i < die->num_attrs; ++i)
16659 if (die->attrs[i].name == name)
16660 return &die->attrs[i];
16661 if (die->attrs[i].name == DW_AT_specification
16662 || die->attrs[i].name == DW_AT_abstract_origin)
16663 spec = &die->attrs[i];
16669 die = follow_die_ref (die, spec, &cu);
16675 /* Return the named attribute or NULL if not there,
16676 but do not follow DW_AT_specification, etc.
16677 This is for use in contexts where we're reading .debug_types dies.
16678 Following DW_AT_specification, DW_AT_abstract_origin will take us
16679 back up the chain, and we want to go down. */
16681 static struct attribute *
16682 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
16686 for (i = 0; i < die->num_attrs; ++i)
16687 if (die->attrs[i].name == name)
16688 return &die->attrs[i];
16693 /* Return non-zero iff the attribute NAME is defined for the given DIE,
16694 and holds a non-zero value. This function should only be used for
16695 DW_FORM_flag or DW_FORM_flag_present attributes. */
16698 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
16700 struct attribute *attr = dwarf2_attr (die, name, cu);
16702 return (attr && DW_UNSND (attr));
16706 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
16708 /* A DIE is a declaration if it has a DW_AT_declaration attribute
16709 which value is non-zero. However, we have to be careful with
16710 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
16711 (via dwarf2_flag_true_p) follows this attribute. So we may
16712 end up accidently finding a declaration attribute that belongs
16713 to a different DIE referenced by the specification attribute,
16714 even though the given DIE does not have a declaration attribute. */
16715 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
16716 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
16719 /* Return the die giving the specification for DIE, if there is
16720 one. *SPEC_CU is the CU containing DIE on input, and the CU
16721 containing the return value on output. If there is no
16722 specification, but there is an abstract origin, that is
16725 static struct die_info *
16726 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
16728 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
16731 if (spec_attr == NULL)
16732 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
16734 if (spec_attr == NULL)
16737 return follow_die_ref (die, spec_attr, spec_cu);
16740 /* Free the line_header structure *LH, and any arrays and strings it
16742 NOTE: This is also used as a "cleanup" function. */
16745 free_line_header (struct line_header *lh)
16747 if (lh->standard_opcode_lengths)
16748 xfree (lh->standard_opcode_lengths);
16750 /* Remember that all the lh->file_names[i].name pointers are
16751 pointers into debug_line_buffer, and don't need to be freed. */
16752 if (lh->file_names)
16753 xfree (lh->file_names);
16755 /* Similarly for the include directory names. */
16756 if (lh->include_dirs)
16757 xfree (lh->include_dirs);
16762 /* Add an entry to LH's include directory table. */
16765 add_include_dir (struct line_header *lh, const char *include_dir)
16767 /* Grow the array if necessary. */
16768 if (lh->include_dirs_size == 0)
16770 lh->include_dirs_size = 1; /* for testing */
16771 lh->include_dirs = xmalloc (lh->include_dirs_size
16772 * sizeof (*lh->include_dirs));
16774 else if (lh->num_include_dirs >= lh->include_dirs_size)
16776 lh->include_dirs_size *= 2;
16777 lh->include_dirs = xrealloc (lh->include_dirs,
16778 (lh->include_dirs_size
16779 * sizeof (*lh->include_dirs)));
16782 lh->include_dirs[lh->num_include_dirs++] = include_dir;
16785 /* Add an entry to LH's file name table. */
16788 add_file_name (struct line_header *lh,
16790 unsigned int dir_index,
16791 unsigned int mod_time,
16792 unsigned int length)
16794 struct file_entry *fe;
16796 /* Grow the array if necessary. */
16797 if (lh->file_names_size == 0)
16799 lh->file_names_size = 1; /* for testing */
16800 lh->file_names = xmalloc (lh->file_names_size
16801 * sizeof (*lh->file_names));
16803 else if (lh->num_file_names >= lh->file_names_size)
16805 lh->file_names_size *= 2;
16806 lh->file_names = xrealloc (lh->file_names,
16807 (lh->file_names_size
16808 * sizeof (*lh->file_names)));
16811 fe = &lh->file_names[lh->num_file_names++];
16813 fe->dir_index = dir_index;
16814 fe->mod_time = mod_time;
16815 fe->length = length;
16816 fe->included_p = 0;
16820 /* A convenience function to find the proper .debug_line section for a
16823 static struct dwarf2_section_info *
16824 get_debug_line_section (struct dwarf2_cu *cu)
16826 struct dwarf2_section_info *section;
16828 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
16830 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16831 section = &cu->dwo_unit->dwo_file->sections.line;
16832 else if (cu->per_cu->is_dwz)
16834 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16836 section = &dwz->line;
16839 section = &dwarf2_per_objfile->line;
16844 /* Read the statement program header starting at OFFSET in
16845 .debug_line, or .debug_line.dwo. Return a pointer
16846 to a struct line_header, allocated using xmalloc.
16848 NOTE: the strings in the include directory and file name tables of
16849 the returned object point into the dwarf line section buffer,
16850 and must not be freed. */
16852 static struct line_header *
16853 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
16855 struct cleanup *back_to;
16856 struct line_header *lh;
16857 const gdb_byte *line_ptr;
16858 unsigned int bytes_read, offset_size;
16860 const char *cur_dir, *cur_file;
16861 struct dwarf2_section_info *section;
16864 section = get_debug_line_section (cu);
16865 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
16866 if (section->buffer == NULL)
16868 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16869 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
16871 complaint (&symfile_complaints, _("missing .debug_line section"));
16875 /* We can't do this until we know the section is non-empty.
16876 Only then do we know we have such a section. */
16877 abfd = get_section_bfd_owner (section);
16879 /* Make sure that at least there's room for the total_length field.
16880 That could be 12 bytes long, but we're just going to fudge that. */
16881 if (offset + 4 >= section->size)
16883 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16887 lh = xmalloc (sizeof (*lh));
16888 memset (lh, 0, sizeof (*lh));
16889 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
16892 line_ptr = section->buffer + offset;
16894 /* Read in the header. */
16896 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
16897 &bytes_read, &offset_size);
16898 line_ptr += bytes_read;
16899 if (line_ptr + lh->total_length > (section->buffer + section->size))
16901 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16902 do_cleanups (back_to);
16905 lh->statement_program_end = line_ptr + lh->total_length;
16906 lh->version = read_2_bytes (abfd, line_ptr);
16908 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
16909 line_ptr += offset_size;
16910 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
16912 if (lh->version >= 4)
16914 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
16918 lh->maximum_ops_per_instruction = 1;
16920 if (lh->maximum_ops_per_instruction == 0)
16922 lh->maximum_ops_per_instruction = 1;
16923 complaint (&symfile_complaints,
16924 _("invalid maximum_ops_per_instruction "
16925 "in `.debug_line' section"));
16928 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
16930 lh->line_base = read_1_signed_byte (abfd, line_ptr);
16932 lh->line_range = read_1_byte (abfd, line_ptr);
16934 lh->opcode_base = read_1_byte (abfd, line_ptr);
16936 lh->standard_opcode_lengths
16937 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
16939 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
16940 for (i = 1; i < lh->opcode_base; ++i)
16942 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
16946 /* Read directory table. */
16947 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16949 line_ptr += bytes_read;
16950 add_include_dir (lh, cur_dir);
16952 line_ptr += bytes_read;
16954 /* Read file name table. */
16955 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16957 unsigned int dir_index, mod_time, length;
16959 line_ptr += bytes_read;
16960 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16961 line_ptr += bytes_read;
16962 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16963 line_ptr += bytes_read;
16964 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16965 line_ptr += bytes_read;
16967 add_file_name (lh, cur_file, dir_index, mod_time, length);
16969 line_ptr += bytes_read;
16970 lh->statement_program_start = line_ptr;
16972 if (line_ptr > (section->buffer + section->size))
16973 complaint (&symfile_complaints,
16974 _("line number info header doesn't "
16975 "fit in `.debug_line' section"));
16977 discard_cleanups (back_to);
16981 /* Subroutine of dwarf_decode_lines to simplify it.
16982 Return the file name of the psymtab for included file FILE_INDEX
16983 in line header LH of PST.
16984 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16985 If space for the result is malloc'd, it will be freed by a cleanup.
16986 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
16988 The function creates dangling cleanup registration. */
16990 static const char *
16991 psymtab_include_file_name (const struct line_header *lh, int file_index,
16992 const struct partial_symtab *pst,
16993 const char *comp_dir)
16995 const struct file_entry fe = lh->file_names [file_index];
16996 const char *include_name = fe.name;
16997 const char *include_name_to_compare = include_name;
16998 const char *dir_name = NULL;
16999 const char *pst_filename;
17000 char *copied_name = NULL;
17004 dir_name = lh->include_dirs[fe.dir_index - 1];
17006 if (!IS_ABSOLUTE_PATH (include_name)
17007 && (dir_name != NULL || comp_dir != NULL))
17009 /* Avoid creating a duplicate psymtab for PST.
17010 We do this by comparing INCLUDE_NAME and PST_FILENAME.
17011 Before we do the comparison, however, we need to account
17012 for DIR_NAME and COMP_DIR.
17013 First prepend dir_name (if non-NULL). If we still don't
17014 have an absolute path prepend comp_dir (if non-NULL).
17015 However, the directory we record in the include-file's
17016 psymtab does not contain COMP_DIR (to match the
17017 corresponding symtab(s)).
17022 bash$ gcc -g ./hello.c
17023 include_name = "hello.c"
17025 DW_AT_comp_dir = comp_dir = "/tmp"
17026 DW_AT_name = "./hello.c" */
17028 if (dir_name != NULL)
17030 char *tem = concat (dir_name, SLASH_STRING,
17031 include_name, (char *)NULL);
17033 make_cleanup (xfree, tem);
17034 include_name = tem;
17035 include_name_to_compare = include_name;
17037 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
17039 char *tem = concat (comp_dir, SLASH_STRING,
17040 include_name, (char *)NULL);
17042 make_cleanup (xfree, tem);
17043 include_name_to_compare = tem;
17047 pst_filename = pst->filename;
17048 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
17050 copied_name = concat (pst->dirname, SLASH_STRING,
17051 pst_filename, (char *)NULL);
17052 pst_filename = copied_name;
17055 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
17057 if (copied_name != NULL)
17058 xfree (copied_name);
17062 return include_name;
17065 /* Ignore this record_line request. */
17068 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
17073 /* Subroutine of dwarf_decode_lines to simplify it.
17074 Process the line number information in LH. */
17077 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
17078 struct dwarf2_cu *cu, struct partial_symtab *pst)
17080 const gdb_byte *line_ptr, *extended_end;
17081 const gdb_byte *line_end;
17082 unsigned int bytes_read, extended_len;
17083 unsigned char op_code, extended_op, adj_opcode;
17084 CORE_ADDR baseaddr;
17085 struct objfile *objfile = cu->objfile;
17086 bfd *abfd = objfile->obfd;
17087 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17088 const int decode_for_pst_p = (pst != NULL);
17089 struct subfile *last_subfile = NULL;
17090 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
17093 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17095 line_ptr = lh->statement_program_start;
17096 line_end = lh->statement_program_end;
17098 /* Read the statement sequences until there's nothing left. */
17099 while (line_ptr < line_end)
17101 /* state machine registers */
17102 CORE_ADDR address = 0;
17103 unsigned int file = 1;
17104 unsigned int line = 1;
17105 unsigned int column = 0;
17106 int is_stmt = lh->default_is_stmt;
17107 int basic_block = 0;
17108 int end_sequence = 0;
17110 unsigned char op_index = 0;
17112 if (!decode_for_pst_p && lh->num_file_names >= file)
17114 /* Start a subfile for the current file of the state machine. */
17115 /* lh->include_dirs and lh->file_names are 0-based, but the
17116 directory and file name numbers in the statement program
17118 struct file_entry *fe = &lh->file_names[file - 1];
17119 const char *dir = NULL;
17122 dir = lh->include_dirs[fe->dir_index - 1];
17124 dwarf2_start_subfile (fe->name, dir, comp_dir);
17127 /* Decode the table. */
17128 while (!end_sequence)
17130 op_code = read_1_byte (abfd, line_ptr);
17132 if (line_ptr > line_end)
17134 dwarf2_debug_line_missing_end_sequence_complaint ();
17138 if (op_code >= lh->opcode_base)
17140 /* Special operand. */
17141 adj_opcode = op_code - lh->opcode_base;
17142 address += (((op_index + (adj_opcode / lh->line_range))
17143 / lh->maximum_ops_per_instruction)
17144 * lh->minimum_instruction_length);
17145 op_index = ((op_index + (adj_opcode / lh->line_range))
17146 % lh->maximum_ops_per_instruction);
17147 line += lh->line_base + (adj_opcode % lh->line_range);
17148 if (lh->num_file_names < file || file == 0)
17149 dwarf2_debug_line_missing_file_complaint ();
17150 /* For now we ignore lines not starting on an
17151 instruction boundary. */
17152 else if (op_index == 0)
17154 lh->file_names[file - 1].included_p = 1;
17155 if (!decode_for_pst_p && is_stmt)
17157 if (last_subfile != current_subfile)
17159 addr = gdbarch_addr_bits_remove (gdbarch, address);
17161 (*p_record_line) (last_subfile, 0, addr);
17162 last_subfile = current_subfile;
17164 /* Append row to matrix using current values. */
17165 addr = gdbarch_addr_bits_remove (gdbarch, address);
17166 (*p_record_line) (current_subfile, line, addr);
17171 else switch (op_code)
17173 case DW_LNS_extended_op:
17174 extended_len = read_unsigned_leb128 (abfd, line_ptr,
17176 line_ptr += bytes_read;
17177 extended_end = line_ptr + extended_len;
17178 extended_op = read_1_byte (abfd, line_ptr);
17180 switch (extended_op)
17182 case DW_LNE_end_sequence:
17183 p_record_line = record_line;
17186 case DW_LNE_set_address:
17187 address = read_address (abfd, line_ptr, cu, &bytes_read);
17189 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
17191 /* This line table is for a function which has been
17192 GCd by the linker. Ignore it. PR gdb/12528 */
17195 = line_ptr - get_debug_line_section (cu)->buffer;
17197 complaint (&symfile_complaints,
17198 _(".debug_line address at offset 0x%lx is 0 "
17200 line_offset, objfile_name (objfile));
17201 p_record_line = noop_record_line;
17205 line_ptr += bytes_read;
17206 address += baseaddr;
17208 case DW_LNE_define_file:
17210 const char *cur_file;
17211 unsigned int dir_index, mod_time, length;
17213 cur_file = read_direct_string (abfd, line_ptr,
17215 line_ptr += bytes_read;
17217 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17218 line_ptr += bytes_read;
17220 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17221 line_ptr += bytes_read;
17223 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17224 line_ptr += bytes_read;
17225 add_file_name (lh, cur_file, dir_index, mod_time, length);
17228 case DW_LNE_set_discriminator:
17229 /* The discriminator is not interesting to the debugger;
17231 line_ptr = extended_end;
17234 complaint (&symfile_complaints,
17235 _("mangled .debug_line section"));
17238 /* Make sure that we parsed the extended op correctly. If e.g.
17239 we expected a different address size than the producer used,
17240 we may have read the wrong number of bytes. */
17241 if (line_ptr != extended_end)
17243 complaint (&symfile_complaints,
17244 _("mangled .debug_line section"));
17249 if (lh->num_file_names < file || file == 0)
17250 dwarf2_debug_line_missing_file_complaint ();
17253 lh->file_names[file - 1].included_p = 1;
17254 if (!decode_for_pst_p && is_stmt)
17256 if (last_subfile != current_subfile)
17258 addr = gdbarch_addr_bits_remove (gdbarch, address);
17260 (*p_record_line) (last_subfile, 0, addr);
17261 last_subfile = current_subfile;
17263 addr = gdbarch_addr_bits_remove (gdbarch, address);
17264 (*p_record_line) (current_subfile, line, addr);
17269 case DW_LNS_advance_pc:
17272 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17274 address += (((op_index + adjust)
17275 / lh->maximum_ops_per_instruction)
17276 * lh->minimum_instruction_length);
17277 op_index = ((op_index + adjust)
17278 % lh->maximum_ops_per_instruction);
17279 line_ptr += bytes_read;
17282 case DW_LNS_advance_line:
17283 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
17284 line_ptr += bytes_read;
17286 case DW_LNS_set_file:
17288 /* The arrays lh->include_dirs and lh->file_names are
17289 0-based, but the directory and file name numbers in
17290 the statement program are 1-based. */
17291 struct file_entry *fe;
17292 const char *dir = NULL;
17294 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17295 line_ptr += bytes_read;
17296 if (lh->num_file_names < file || file == 0)
17297 dwarf2_debug_line_missing_file_complaint ();
17300 fe = &lh->file_names[file - 1];
17302 dir = lh->include_dirs[fe->dir_index - 1];
17303 if (!decode_for_pst_p)
17305 last_subfile = current_subfile;
17306 dwarf2_start_subfile (fe->name, dir, comp_dir);
17311 case DW_LNS_set_column:
17312 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17313 line_ptr += bytes_read;
17315 case DW_LNS_negate_stmt:
17316 is_stmt = (!is_stmt);
17318 case DW_LNS_set_basic_block:
17321 /* Add to the address register of the state machine the
17322 address increment value corresponding to special opcode
17323 255. I.e., this value is scaled by the minimum
17324 instruction length since special opcode 255 would have
17325 scaled the increment. */
17326 case DW_LNS_const_add_pc:
17328 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
17330 address += (((op_index + adjust)
17331 / lh->maximum_ops_per_instruction)
17332 * lh->minimum_instruction_length);
17333 op_index = ((op_index + adjust)
17334 % lh->maximum_ops_per_instruction);
17337 case DW_LNS_fixed_advance_pc:
17338 address += read_2_bytes (abfd, line_ptr);
17344 /* Unknown standard opcode, ignore it. */
17347 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
17349 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17350 line_ptr += bytes_read;
17355 if (lh->num_file_names < file || file == 0)
17356 dwarf2_debug_line_missing_file_complaint ();
17359 lh->file_names[file - 1].included_p = 1;
17360 if (!decode_for_pst_p)
17362 addr = gdbarch_addr_bits_remove (gdbarch, address);
17363 (*p_record_line) (current_subfile, 0, addr);
17369 /* Decode the Line Number Program (LNP) for the given line_header
17370 structure and CU. The actual information extracted and the type
17371 of structures created from the LNP depends on the value of PST.
17373 1. If PST is NULL, then this procedure uses the data from the program
17374 to create all necessary symbol tables, and their linetables.
17376 2. If PST is not NULL, this procedure reads the program to determine
17377 the list of files included by the unit represented by PST, and
17378 builds all the associated partial symbol tables.
17380 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
17381 It is used for relative paths in the line table.
17382 NOTE: When processing partial symtabs (pst != NULL),
17383 comp_dir == pst->dirname.
17385 NOTE: It is important that psymtabs have the same file name (via strcmp)
17386 as the corresponding symtab. Since COMP_DIR is not used in the name of the
17387 symtab we don't use it in the name of the psymtabs we create.
17388 E.g. expand_line_sal requires this when finding psymtabs to expand.
17389 A good testcase for this is mb-inline.exp. */
17392 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
17393 struct dwarf2_cu *cu, struct partial_symtab *pst,
17394 int want_line_info)
17396 struct objfile *objfile = cu->objfile;
17397 const int decode_for_pst_p = (pst != NULL);
17398 struct subfile *first_subfile = current_subfile;
17400 if (want_line_info)
17401 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
17403 if (decode_for_pst_p)
17407 /* Now that we're done scanning the Line Header Program, we can
17408 create the psymtab of each included file. */
17409 for (file_index = 0; file_index < lh->num_file_names; file_index++)
17410 if (lh->file_names[file_index].included_p == 1)
17412 const char *include_name =
17413 psymtab_include_file_name (lh, file_index, pst, comp_dir);
17414 if (include_name != NULL)
17415 dwarf2_create_include_psymtab (include_name, pst, objfile);
17420 /* Make sure a symtab is created for every file, even files
17421 which contain only variables (i.e. no code with associated
17425 for (i = 0; i < lh->num_file_names; i++)
17427 const char *dir = NULL;
17428 struct file_entry *fe;
17430 fe = &lh->file_names[i];
17432 dir = lh->include_dirs[fe->dir_index - 1];
17433 dwarf2_start_subfile (fe->name, dir, comp_dir);
17435 /* Skip the main file; we don't need it, and it must be
17436 allocated last, so that it will show up before the
17437 non-primary symtabs in the objfile's symtab list. */
17438 if (current_subfile == first_subfile)
17441 if (current_subfile->symtab == NULL)
17442 current_subfile->symtab = allocate_symtab (current_subfile->name,
17444 fe->symtab = current_subfile->symtab;
17449 /* Start a subfile for DWARF. FILENAME is the name of the file and
17450 DIRNAME the name of the source directory which contains FILENAME
17451 or NULL if not known. COMP_DIR is the compilation directory for the
17452 linetable's compilation unit or NULL if not known.
17453 This routine tries to keep line numbers from identical absolute and
17454 relative file names in a common subfile.
17456 Using the `list' example from the GDB testsuite, which resides in
17457 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
17458 of /srcdir/list0.c yields the following debugging information for list0.c:
17460 DW_AT_name: /srcdir/list0.c
17461 DW_AT_comp_dir: /compdir
17462 files.files[0].name: list0.h
17463 files.files[0].dir: /srcdir
17464 files.files[1].name: list0.c
17465 files.files[1].dir: /srcdir
17467 The line number information for list0.c has to end up in a single
17468 subfile, so that `break /srcdir/list0.c:1' works as expected.
17469 start_subfile will ensure that this happens provided that we pass the
17470 concatenation of files.files[1].dir and files.files[1].name as the
17474 dwarf2_start_subfile (const char *filename, const char *dirname,
17475 const char *comp_dir)
17479 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
17480 `start_symtab' will always pass the contents of DW_AT_comp_dir as
17481 second argument to start_subfile. To be consistent, we do the
17482 same here. In order not to lose the line information directory,
17483 we concatenate it to the filename when it makes sense.
17484 Note that the Dwarf3 standard says (speaking of filenames in line
17485 information): ``The directory index is ignored for file names
17486 that represent full path names''. Thus ignoring dirname in the
17487 `else' branch below isn't an issue. */
17489 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
17491 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
17495 start_subfile (filename, comp_dir);
17501 /* Start a symtab for DWARF.
17502 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
17505 dwarf2_start_symtab (struct dwarf2_cu *cu,
17506 const char *name, const char *comp_dir, CORE_ADDR low_pc)
17508 start_symtab (name, comp_dir, low_pc);
17509 record_debugformat ("DWARF 2");
17510 record_producer (cu->producer);
17512 /* We assume that we're processing GCC output. */
17513 processing_gcc_compilation = 2;
17515 cu->processing_has_namespace_info = 0;
17519 var_decode_location (struct attribute *attr, struct symbol *sym,
17520 struct dwarf2_cu *cu)
17522 struct objfile *objfile = cu->objfile;
17523 struct comp_unit_head *cu_header = &cu->header;
17525 /* NOTE drow/2003-01-30: There used to be a comment and some special
17526 code here to turn a symbol with DW_AT_external and a
17527 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
17528 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
17529 with some versions of binutils) where shared libraries could have
17530 relocations against symbols in their debug information - the
17531 minimal symbol would have the right address, but the debug info
17532 would not. It's no longer necessary, because we will explicitly
17533 apply relocations when we read in the debug information now. */
17535 /* A DW_AT_location attribute with no contents indicates that a
17536 variable has been optimized away. */
17537 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
17539 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17543 /* Handle one degenerate form of location expression specially, to
17544 preserve GDB's previous behavior when section offsets are
17545 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
17546 then mark this symbol as LOC_STATIC. */
17548 if (attr_form_is_block (attr)
17549 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
17550 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
17551 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
17552 && (DW_BLOCK (attr)->size
17553 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
17555 unsigned int dummy;
17557 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
17558 SYMBOL_VALUE_ADDRESS (sym) =
17559 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
17561 SYMBOL_VALUE_ADDRESS (sym) =
17562 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
17563 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
17564 fixup_symbol_section (sym, objfile);
17565 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
17566 SYMBOL_SECTION (sym));
17570 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
17571 expression evaluator, and use LOC_COMPUTED only when necessary
17572 (i.e. when the value of a register or memory location is
17573 referenced, or a thread-local block, etc.). Then again, it might
17574 not be worthwhile. I'm assuming that it isn't unless performance
17575 or memory numbers show me otherwise. */
17577 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
17579 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
17580 cu->has_loclist = 1;
17583 /* Given a pointer to a DWARF information entry, figure out if we need
17584 to make a symbol table entry for it, and if so, create a new entry
17585 and return a pointer to it.
17586 If TYPE is NULL, determine symbol type from the die, otherwise
17587 used the passed type.
17588 If SPACE is not NULL, use it to hold the new symbol. If it is
17589 NULL, allocate a new symbol on the objfile's obstack. */
17591 static struct symbol *
17592 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
17593 struct symbol *space)
17595 struct objfile *objfile = cu->objfile;
17596 struct symbol *sym = NULL;
17598 struct attribute *attr = NULL;
17599 struct attribute *attr2 = NULL;
17600 CORE_ADDR baseaddr;
17601 struct pending **list_to_add = NULL;
17603 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
17605 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17607 name = dwarf2_name (die, cu);
17610 const char *linkagename;
17611 int suppress_add = 0;
17616 sym = allocate_symbol (objfile);
17617 OBJSTAT (objfile, n_syms++);
17619 /* Cache this symbol's name and the name's demangled form (if any). */
17620 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
17621 linkagename = dwarf2_physname (name, die, cu);
17622 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
17624 /* Fortran does not have mangling standard and the mangling does differ
17625 between gfortran, iFort etc. */
17626 if (cu->language == language_fortran
17627 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
17628 symbol_set_demangled_name (&(sym->ginfo),
17629 dwarf2_full_name (name, die, cu),
17632 /* Default assumptions.
17633 Use the passed type or decode it from the die. */
17634 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17635 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17637 SYMBOL_TYPE (sym) = type;
17639 SYMBOL_TYPE (sym) = die_type (die, cu);
17640 attr = dwarf2_attr (die,
17641 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
17645 SYMBOL_LINE (sym) = DW_UNSND (attr);
17648 attr = dwarf2_attr (die,
17649 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
17653 int file_index = DW_UNSND (attr);
17655 if (cu->line_header == NULL
17656 || file_index > cu->line_header->num_file_names)
17657 complaint (&symfile_complaints,
17658 _("file index out of range"));
17659 else if (file_index > 0)
17661 struct file_entry *fe;
17663 fe = &cu->line_header->file_names[file_index - 1];
17664 SYMBOL_SYMTAB (sym) = fe->symtab;
17671 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
17673 SYMBOL_VALUE_ADDRESS (sym)
17674 = attr_value_as_address (attr) + baseaddr;
17675 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
17676 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
17677 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
17678 add_symbol_to_list (sym, cu->list_in_scope);
17680 case DW_TAG_subprogram:
17681 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17683 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17684 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17685 if ((attr2 && (DW_UNSND (attr2) != 0))
17686 || cu->language == language_ada)
17688 /* Subprograms marked external are stored as a global symbol.
17689 Ada subprograms, whether marked external or not, are always
17690 stored as a global symbol, because we want to be able to
17691 access them globally. For instance, we want to be able
17692 to break on a nested subprogram without having to
17693 specify the context. */
17694 list_to_add = &global_symbols;
17698 list_to_add = cu->list_in_scope;
17701 case DW_TAG_inlined_subroutine:
17702 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17704 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17705 SYMBOL_INLINED (sym) = 1;
17706 list_to_add = cu->list_in_scope;
17708 case DW_TAG_template_value_param:
17710 /* Fall through. */
17711 case DW_TAG_constant:
17712 case DW_TAG_variable:
17713 case DW_TAG_member:
17714 /* Compilation with minimal debug info may result in
17715 variables with missing type entries. Change the
17716 misleading `void' type to something sensible. */
17717 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
17719 = objfile_type (objfile)->nodebug_data_symbol;
17721 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17722 /* In the case of DW_TAG_member, we should only be called for
17723 static const members. */
17724 if (die->tag == DW_TAG_member)
17726 /* dwarf2_add_field uses die_is_declaration,
17727 so we do the same. */
17728 gdb_assert (die_is_declaration (die, cu));
17733 dwarf2_const_value (attr, sym, cu);
17734 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17737 if (attr2 && (DW_UNSND (attr2) != 0))
17738 list_to_add = &global_symbols;
17740 list_to_add = cu->list_in_scope;
17744 attr = dwarf2_attr (die, DW_AT_location, cu);
17747 var_decode_location (attr, sym, cu);
17748 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17750 /* Fortran explicitly imports any global symbols to the local
17751 scope by DW_TAG_common_block. */
17752 if (cu->language == language_fortran && die->parent
17753 && die->parent->tag == DW_TAG_common_block)
17756 if (SYMBOL_CLASS (sym) == LOC_STATIC
17757 && SYMBOL_VALUE_ADDRESS (sym) == 0
17758 && !dwarf2_per_objfile->has_section_at_zero)
17760 /* When a static variable is eliminated by the linker,
17761 the corresponding debug information is not stripped
17762 out, but the variable address is set to null;
17763 do not add such variables into symbol table. */
17765 else if (attr2 && (DW_UNSND (attr2) != 0))
17767 /* Workaround gfortran PR debug/40040 - it uses
17768 DW_AT_location for variables in -fPIC libraries which may
17769 get overriden by other libraries/executable and get
17770 a different address. Resolve it by the minimal symbol
17771 which may come from inferior's executable using copy
17772 relocation. Make this workaround only for gfortran as for
17773 other compilers GDB cannot guess the minimal symbol
17774 Fortran mangling kind. */
17775 if (cu->language == language_fortran && die->parent
17776 && die->parent->tag == DW_TAG_module
17778 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
17779 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17781 /* A variable with DW_AT_external is never static,
17782 but it may be block-scoped. */
17783 list_to_add = (cu->list_in_scope == &file_symbols
17784 ? &global_symbols : cu->list_in_scope);
17787 list_to_add = cu->list_in_scope;
17791 /* We do not know the address of this symbol.
17792 If it is an external symbol and we have type information
17793 for it, enter the symbol as a LOC_UNRESOLVED symbol.
17794 The address of the variable will then be determined from
17795 the minimal symbol table whenever the variable is
17797 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17799 /* Fortran explicitly imports any global symbols to the local
17800 scope by DW_TAG_common_block. */
17801 if (cu->language == language_fortran && die->parent
17802 && die->parent->tag == DW_TAG_common_block)
17804 /* SYMBOL_CLASS doesn't matter here because
17805 read_common_block is going to reset it. */
17807 list_to_add = cu->list_in_scope;
17809 else if (attr2 && (DW_UNSND (attr2) != 0)
17810 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
17812 /* A variable with DW_AT_external is never static, but it
17813 may be block-scoped. */
17814 list_to_add = (cu->list_in_scope == &file_symbols
17815 ? &global_symbols : cu->list_in_scope);
17817 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17819 else if (!die_is_declaration (die, cu))
17821 /* Use the default LOC_OPTIMIZED_OUT class. */
17822 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
17824 list_to_add = cu->list_in_scope;
17828 case DW_TAG_formal_parameter:
17829 /* If we are inside a function, mark this as an argument. If
17830 not, we might be looking at an argument to an inlined function
17831 when we do not have enough information to show inlined frames;
17832 pretend it's a local variable in that case so that the user can
17834 if (context_stack_depth > 0
17835 && context_stack[context_stack_depth - 1].name != NULL)
17836 SYMBOL_IS_ARGUMENT (sym) = 1;
17837 attr = dwarf2_attr (die, DW_AT_location, cu);
17840 var_decode_location (attr, sym, cu);
17842 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17845 dwarf2_const_value (attr, sym, cu);
17848 list_to_add = cu->list_in_scope;
17850 case DW_TAG_unspecified_parameters:
17851 /* From varargs functions; gdb doesn't seem to have any
17852 interest in this information, so just ignore it for now.
17855 case DW_TAG_template_type_param:
17857 /* Fall through. */
17858 case DW_TAG_class_type:
17859 case DW_TAG_interface_type:
17860 case DW_TAG_structure_type:
17861 case DW_TAG_union_type:
17862 case DW_TAG_set_type:
17863 case DW_TAG_enumeration_type:
17864 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17865 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
17868 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
17869 really ever be static objects: otherwise, if you try
17870 to, say, break of a class's method and you're in a file
17871 which doesn't mention that class, it won't work unless
17872 the check for all static symbols in lookup_symbol_aux
17873 saves you. See the OtherFileClass tests in
17874 gdb.c++/namespace.exp. */
17878 list_to_add = (cu->list_in_scope == &file_symbols
17879 && (cu->language == language_cplus
17880 || cu->language == language_java)
17881 ? &global_symbols : cu->list_in_scope);
17883 /* The semantics of C++ state that "struct foo {
17884 ... }" also defines a typedef for "foo". A Java
17885 class declaration also defines a typedef for the
17887 if (cu->language == language_cplus
17888 || cu->language == language_java
17889 || cu->language == language_ada)
17891 /* The symbol's name is already allocated along
17892 with this objfile, so we don't need to
17893 duplicate it for the type. */
17894 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
17895 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
17900 case DW_TAG_typedef:
17901 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17902 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17903 list_to_add = cu->list_in_scope;
17905 case DW_TAG_base_type:
17906 case DW_TAG_subrange_type:
17907 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17908 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17909 list_to_add = cu->list_in_scope;
17911 case DW_TAG_enumerator:
17912 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17915 dwarf2_const_value (attr, sym, cu);
17918 /* NOTE: carlton/2003-11-10: See comment above in the
17919 DW_TAG_class_type, etc. block. */
17921 list_to_add = (cu->list_in_scope == &file_symbols
17922 && (cu->language == language_cplus
17923 || cu->language == language_java)
17924 ? &global_symbols : cu->list_in_scope);
17927 case DW_TAG_imported_declaration:
17928 case DW_TAG_namespace:
17929 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17930 list_to_add = &global_symbols;
17932 case DW_TAG_module:
17933 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17934 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
17935 list_to_add = &global_symbols;
17937 case DW_TAG_common_block:
17938 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
17939 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
17940 add_symbol_to_list (sym, cu->list_in_scope);
17943 /* Not a tag we recognize. Hopefully we aren't processing
17944 trash data, but since we must specifically ignore things
17945 we don't recognize, there is nothing else we should do at
17947 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
17948 dwarf_tag_name (die->tag));
17954 sym->hash_next = objfile->template_symbols;
17955 objfile->template_symbols = sym;
17956 list_to_add = NULL;
17959 if (list_to_add != NULL)
17960 add_symbol_to_list (sym, list_to_add);
17962 /* For the benefit of old versions of GCC, check for anonymous
17963 namespaces based on the demangled name. */
17964 if (!cu->processing_has_namespace_info
17965 && cu->language == language_cplus)
17966 cp_scan_for_anonymous_namespaces (sym, objfile);
17971 /* A wrapper for new_symbol_full that always allocates a new symbol. */
17973 static struct symbol *
17974 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
17976 return new_symbol_full (die, type, cu, NULL);
17979 /* Given an attr with a DW_FORM_dataN value in host byte order,
17980 zero-extend it as appropriate for the symbol's type. The DWARF
17981 standard (v4) is not entirely clear about the meaning of using
17982 DW_FORM_dataN for a constant with a signed type, where the type is
17983 wider than the data. The conclusion of a discussion on the DWARF
17984 list was that this is unspecified. We choose to always zero-extend
17985 because that is the interpretation long in use by GCC. */
17988 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
17989 struct dwarf2_cu *cu, LONGEST *value, int bits)
17991 struct objfile *objfile = cu->objfile;
17992 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
17993 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
17994 LONGEST l = DW_UNSND (attr);
17996 if (bits < sizeof (*value) * 8)
17998 l &= ((LONGEST) 1 << bits) - 1;
18001 else if (bits == sizeof (*value) * 8)
18005 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
18006 store_unsigned_integer (bytes, bits / 8, byte_order, l);
18013 /* Read a constant value from an attribute. Either set *VALUE, or if
18014 the value does not fit in *VALUE, set *BYTES - either already
18015 allocated on the objfile obstack, or newly allocated on OBSTACK,
18016 or, set *BATON, if we translated the constant to a location
18020 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
18021 const char *name, struct obstack *obstack,
18022 struct dwarf2_cu *cu,
18023 LONGEST *value, const gdb_byte **bytes,
18024 struct dwarf2_locexpr_baton **baton)
18026 struct objfile *objfile = cu->objfile;
18027 struct comp_unit_head *cu_header = &cu->header;
18028 struct dwarf_block *blk;
18029 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
18030 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18036 switch (attr->form)
18039 case DW_FORM_GNU_addr_index:
18043 if (TYPE_LENGTH (type) != cu_header->addr_size)
18044 dwarf2_const_value_length_mismatch_complaint (name,
18045 cu_header->addr_size,
18046 TYPE_LENGTH (type));
18047 /* Symbols of this form are reasonably rare, so we just
18048 piggyback on the existing location code rather than writing
18049 a new implementation of symbol_computed_ops. */
18050 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
18051 (*baton)->per_cu = cu->per_cu;
18052 gdb_assert ((*baton)->per_cu);
18054 (*baton)->size = 2 + cu_header->addr_size;
18055 data = obstack_alloc (obstack, (*baton)->size);
18056 (*baton)->data = data;
18058 data[0] = DW_OP_addr;
18059 store_unsigned_integer (&data[1], cu_header->addr_size,
18060 byte_order, DW_ADDR (attr));
18061 data[cu_header->addr_size + 1] = DW_OP_stack_value;
18064 case DW_FORM_string:
18066 case DW_FORM_GNU_str_index:
18067 case DW_FORM_GNU_strp_alt:
18068 /* DW_STRING is already allocated on the objfile obstack, point
18070 *bytes = (const gdb_byte *) DW_STRING (attr);
18072 case DW_FORM_block1:
18073 case DW_FORM_block2:
18074 case DW_FORM_block4:
18075 case DW_FORM_block:
18076 case DW_FORM_exprloc:
18077 blk = DW_BLOCK (attr);
18078 if (TYPE_LENGTH (type) != blk->size)
18079 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
18080 TYPE_LENGTH (type));
18081 *bytes = blk->data;
18084 /* The DW_AT_const_value attributes are supposed to carry the
18085 symbol's value "represented as it would be on the target
18086 architecture." By the time we get here, it's already been
18087 converted to host endianness, so we just need to sign- or
18088 zero-extend it as appropriate. */
18089 case DW_FORM_data1:
18090 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
18092 case DW_FORM_data2:
18093 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
18095 case DW_FORM_data4:
18096 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
18098 case DW_FORM_data8:
18099 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
18102 case DW_FORM_sdata:
18103 *value = DW_SND (attr);
18106 case DW_FORM_udata:
18107 *value = DW_UNSND (attr);
18111 complaint (&symfile_complaints,
18112 _("unsupported const value attribute form: '%s'"),
18113 dwarf_form_name (attr->form));
18120 /* Copy constant value from an attribute to a symbol. */
18123 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
18124 struct dwarf2_cu *cu)
18126 struct objfile *objfile = cu->objfile;
18127 struct comp_unit_head *cu_header = &cu->header;
18129 const gdb_byte *bytes;
18130 struct dwarf2_locexpr_baton *baton;
18132 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
18133 SYMBOL_PRINT_NAME (sym),
18134 &objfile->objfile_obstack, cu,
18135 &value, &bytes, &baton);
18139 SYMBOL_LOCATION_BATON (sym) = baton;
18140 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
18142 else if (bytes != NULL)
18144 SYMBOL_VALUE_BYTES (sym) = bytes;
18145 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
18149 SYMBOL_VALUE (sym) = value;
18150 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
18154 /* Return the type of the die in question using its DW_AT_type attribute. */
18156 static struct type *
18157 die_type (struct die_info *die, struct dwarf2_cu *cu)
18159 struct attribute *type_attr;
18161 type_attr = dwarf2_attr (die, DW_AT_type, cu);
18164 /* A missing DW_AT_type represents a void type. */
18165 return objfile_type (cu->objfile)->builtin_void;
18168 return lookup_die_type (die, type_attr, cu);
18171 /* True iff CU's producer generates GNAT Ada auxiliary information
18172 that allows to find parallel types through that information instead
18173 of having to do expensive parallel lookups by type name. */
18176 need_gnat_info (struct dwarf2_cu *cu)
18178 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
18179 of GNAT produces this auxiliary information, without any indication
18180 that it is produced. Part of enhancing the FSF version of GNAT
18181 to produce that information will be to put in place an indicator
18182 that we can use in order to determine whether the descriptive type
18183 info is available or not. One suggestion that has been made is
18184 to use a new attribute, attached to the CU die. For now, assume
18185 that the descriptive type info is not available. */
18189 /* Return the auxiliary type of the die in question using its
18190 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
18191 attribute is not present. */
18193 static struct type *
18194 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
18196 struct attribute *type_attr;
18198 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
18202 return lookup_die_type (die, type_attr, cu);
18205 /* If DIE has a descriptive_type attribute, then set the TYPE's
18206 descriptive type accordingly. */
18209 set_descriptive_type (struct type *type, struct die_info *die,
18210 struct dwarf2_cu *cu)
18212 struct type *descriptive_type = die_descriptive_type (die, cu);
18214 if (descriptive_type)
18216 ALLOCATE_GNAT_AUX_TYPE (type);
18217 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
18221 /* Return the containing type of the die in question using its
18222 DW_AT_containing_type attribute. */
18224 static struct type *
18225 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
18227 struct attribute *type_attr;
18229 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
18231 error (_("Dwarf Error: Problem turning containing type into gdb type "
18232 "[in module %s]"), objfile_name (cu->objfile));
18234 return lookup_die_type (die, type_attr, cu);
18237 /* Return an error marker type to use for the ill formed type in DIE/CU. */
18239 static struct type *
18240 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
18242 struct objfile *objfile = dwarf2_per_objfile->objfile;
18243 char *message, *saved;
18245 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
18246 objfile_name (objfile),
18247 cu->header.offset.sect_off,
18248 die->offset.sect_off);
18249 saved = obstack_copy0 (&objfile->objfile_obstack,
18250 message, strlen (message));
18253 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
18256 /* Look up the type of DIE in CU using its type attribute ATTR.
18257 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
18258 DW_AT_containing_type.
18259 If there is no type substitute an error marker. */
18261 static struct type *
18262 lookup_die_type (struct die_info *die, const struct attribute *attr,
18263 struct dwarf2_cu *cu)
18265 struct objfile *objfile = cu->objfile;
18266 struct type *this_type;
18268 gdb_assert (attr->name == DW_AT_type
18269 || attr->name == DW_AT_GNAT_descriptive_type
18270 || attr->name == DW_AT_containing_type);
18272 /* First see if we have it cached. */
18274 if (attr->form == DW_FORM_GNU_ref_alt)
18276 struct dwarf2_per_cu_data *per_cu;
18277 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18279 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
18280 this_type = get_die_type_at_offset (offset, per_cu);
18282 else if (attr_form_is_ref (attr))
18284 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18286 this_type = get_die_type_at_offset (offset, cu->per_cu);
18288 else if (attr->form == DW_FORM_ref_sig8)
18290 ULONGEST signature = DW_SIGNATURE (attr);
18292 return get_signatured_type (die, signature, cu);
18296 complaint (&symfile_complaints,
18297 _("Dwarf Error: Bad type attribute %s in DIE"
18298 " at 0x%x [in module %s]"),
18299 dwarf_attr_name (attr->name), die->offset.sect_off,
18300 objfile_name (objfile));
18301 return build_error_marker_type (cu, die);
18304 /* If not cached we need to read it in. */
18306 if (this_type == NULL)
18308 struct die_info *type_die = NULL;
18309 struct dwarf2_cu *type_cu = cu;
18311 if (attr_form_is_ref (attr))
18312 type_die = follow_die_ref (die, attr, &type_cu);
18313 if (type_die == NULL)
18314 return build_error_marker_type (cu, die);
18315 /* If we find the type now, it's probably because the type came
18316 from an inter-CU reference and the type's CU got expanded before
18318 this_type = read_type_die (type_die, type_cu);
18321 /* If we still don't have a type use an error marker. */
18323 if (this_type == NULL)
18324 return build_error_marker_type (cu, die);
18329 /* Return the type in DIE, CU.
18330 Returns NULL for invalid types.
18332 This first does a lookup in die_type_hash,
18333 and only reads the die in if necessary.
18335 NOTE: This can be called when reading in partial or full symbols. */
18337 static struct type *
18338 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
18340 struct type *this_type;
18342 this_type = get_die_type (die, cu);
18346 return read_type_die_1 (die, cu);
18349 /* Read the type in DIE, CU.
18350 Returns NULL for invalid types. */
18352 static struct type *
18353 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
18355 struct type *this_type = NULL;
18359 case DW_TAG_class_type:
18360 case DW_TAG_interface_type:
18361 case DW_TAG_structure_type:
18362 case DW_TAG_union_type:
18363 this_type = read_structure_type (die, cu);
18365 case DW_TAG_enumeration_type:
18366 this_type = read_enumeration_type (die, cu);
18368 case DW_TAG_subprogram:
18369 case DW_TAG_subroutine_type:
18370 case DW_TAG_inlined_subroutine:
18371 this_type = read_subroutine_type (die, cu);
18373 case DW_TAG_array_type:
18374 this_type = read_array_type (die, cu);
18376 case DW_TAG_set_type:
18377 this_type = read_set_type (die, cu);
18379 case DW_TAG_pointer_type:
18380 this_type = read_tag_pointer_type (die, cu);
18382 case DW_TAG_ptr_to_member_type:
18383 this_type = read_tag_ptr_to_member_type (die, cu);
18385 case DW_TAG_reference_type:
18386 this_type = read_tag_reference_type (die, cu);
18388 case DW_TAG_const_type:
18389 this_type = read_tag_const_type (die, cu);
18391 case DW_TAG_volatile_type:
18392 this_type = read_tag_volatile_type (die, cu);
18394 case DW_TAG_restrict_type:
18395 this_type = read_tag_restrict_type (die, cu);
18397 case DW_TAG_string_type:
18398 this_type = read_tag_string_type (die, cu);
18400 case DW_TAG_typedef:
18401 this_type = read_typedef (die, cu);
18403 case DW_TAG_subrange_type:
18404 this_type = read_subrange_type (die, cu);
18406 case DW_TAG_base_type:
18407 this_type = read_base_type (die, cu);
18409 case DW_TAG_unspecified_type:
18410 this_type = read_unspecified_type (die, cu);
18412 case DW_TAG_namespace:
18413 this_type = read_namespace_type (die, cu);
18415 case DW_TAG_module:
18416 this_type = read_module_type (die, cu);
18419 complaint (&symfile_complaints,
18420 _("unexpected tag in read_type_die: '%s'"),
18421 dwarf_tag_name (die->tag));
18428 /* See if we can figure out if the class lives in a namespace. We do
18429 this by looking for a member function; its demangled name will
18430 contain namespace info, if there is any.
18431 Return the computed name or NULL.
18432 Space for the result is allocated on the objfile's obstack.
18433 This is the full-die version of guess_partial_die_structure_name.
18434 In this case we know DIE has no useful parent. */
18437 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
18439 struct die_info *spec_die;
18440 struct dwarf2_cu *spec_cu;
18441 struct die_info *child;
18444 spec_die = die_specification (die, &spec_cu);
18445 if (spec_die != NULL)
18451 for (child = die->child;
18453 child = child->sibling)
18455 if (child->tag == DW_TAG_subprogram)
18457 struct attribute *attr;
18459 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
18461 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
18465 = language_class_name_from_physname (cu->language_defn,
18469 if (actual_name != NULL)
18471 const char *die_name = dwarf2_name (die, cu);
18473 if (die_name != NULL
18474 && strcmp (die_name, actual_name) != 0)
18476 /* Strip off the class name from the full name.
18477 We want the prefix. */
18478 int die_name_len = strlen (die_name);
18479 int actual_name_len = strlen (actual_name);
18481 /* Test for '::' as a sanity check. */
18482 if (actual_name_len > die_name_len + 2
18483 && actual_name[actual_name_len
18484 - die_name_len - 1] == ':')
18486 obstack_copy0 (&cu->objfile->objfile_obstack,
18488 actual_name_len - die_name_len - 2);
18491 xfree (actual_name);
18500 /* GCC might emit a nameless typedef that has a linkage name. Determine the
18501 prefix part in such case. See
18502 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18505 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
18507 struct attribute *attr;
18510 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
18511 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
18514 attr = dwarf2_attr (die, DW_AT_name, cu);
18515 if (attr != NULL && DW_STRING (attr) != NULL)
18518 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18520 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18521 if (attr == NULL || DW_STRING (attr) == NULL)
18524 /* dwarf2_name had to be already called. */
18525 gdb_assert (DW_STRING_IS_CANONICAL (attr));
18527 /* Strip the base name, keep any leading namespaces/classes. */
18528 base = strrchr (DW_STRING (attr), ':');
18529 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
18532 return obstack_copy0 (&cu->objfile->objfile_obstack,
18533 DW_STRING (attr), &base[-1] - DW_STRING (attr));
18536 /* Return the name of the namespace/class that DIE is defined within,
18537 or "" if we can't tell. The caller should not xfree the result.
18539 For example, if we're within the method foo() in the following
18549 then determine_prefix on foo's die will return "N::C". */
18551 static const char *
18552 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
18554 struct die_info *parent, *spec_die;
18555 struct dwarf2_cu *spec_cu;
18556 struct type *parent_type;
18559 if (cu->language != language_cplus && cu->language != language_java
18560 && cu->language != language_fortran)
18563 retval = anonymous_struct_prefix (die, cu);
18567 /* We have to be careful in the presence of DW_AT_specification.
18568 For example, with GCC 3.4, given the code
18572 // Definition of N::foo.
18576 then we'll have a tree of DIEs like this:
18578 1: DW_TAG_compile_unit
18579 2: DW_TAG_namespace // N
18580 3: DW_TAG_subprogram // declaration of N::foo
18581 4: DW_TAG_subprogram // definition of N::foo
18582 DW_AT_specification // refers to die #3
18584 Thus, when processing die #4, we have to pretend that we're in
18585 the context of its DW_AT_specification, namely the contex of die
18588 spec_die = die_specification (die, &spec_cu);
18589 if (spec_die == NULL)
18590 parent = die->parent;
18593 parent = spec_die->parent;
18597 if (parent == NULL)
18599 else if (parent->building_fullname)
18602 const char *parent_name;
18604 /* It has been seen on RealView 2.2 built binaries,
18605 DW_TAG_template_type_param types actually _defined_ as
18606 children of the parent class:
18609 template class <class Enum> Class{};
18610 Class<enum E> class_e;
18612 1: DW_TAG_class_type (Class)
18613 2: DW_TAG_enumeration_type (E)
18614 3: DW_TAG_enumerator (enum1:0)
18615 3: DW_TAG_enumerator (enum2:1)
18617 2: DW_TAG_template_type_param
18618 DW_AT_type DW_FORM_ref_udata (E)
18620 Besides being broken debug info, it can put GDB into an
18621 infinite loop. Consider:
18623 When we're building the full name for Class<E>, we'll start
18624 at Class, and go look over its template type parameters,
18625 finding E. We'll then try to build the full name of E, and
18626 reach here. We're now trying to build the full name of E,
18627 and look over the parent DIE for containing scope. In the
18628 broken case, if we followed the parent DIE of E, we'd again
18629 find Class, and once again go look at its template type
18630 arguments, etc., etc. Simply don't consider such parent die
18631 as source-level parent of this die (it can't be, the language
18632 doesn't allow it), and break the loop here. */
18633 name = dwarf2_name (die, cu);
18634 parent_name = dwarf2_name (parent, cu);
18635 complaint (&symfile_complaints,
18636 _("template param type '%s' defined within parent '%s'"),
18637 name ? name : "<unknown>",
18638 parent_name ? parent_name : "<unknown>");
18642 switch (parent->tag)
18644 case DW_TAG_namespace:
18645 parent_type = read_type_die (parent, cu);
18646 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
18647 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
18648 Work around this problem here. */
18649 if (cu->language == language_cplus
18650 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
18652 /* We give a name to even anonymous namespaces. */
18653 return TYPE_TAG_NAME (parent_type);
18654 case DW_TAG_class_type:
18655 case DW_TAG_interface_type:
18656 case DW_TAG_structure_type:
18657 case DW_TAG_union_type:
18658 case DW_TAG_module:
18659 parent_type = read_type_die (parent, cu);
18660 if (TYPE_TAG_NAME (parent_type) != NULL)
18661 return TYPE_TAG_NAME (parent_type);
18663 /* An anonymous structure is only allowed non-static data
18664 members; no typedefs, no member functions, et cetera.
18665 So it does not need a prefix. */
18667 case DW_TAG_compile_unit:
18668 case DW_TAG_partial_unit:
18669 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
18670 if (cu->language == language_cplus
18671 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
18672 && die->child != NULL
18673 && (die->tag == DW_TAG_class_type
18674 || die->tag == DW_TAG_structure_type
18675 || die->tag == DW_TAG_union_type))
18677 char *name = guess_full_die_structure_name (die, cu);
18682 case DW_TAG_enumeration_type:
18683 parent_type = read_type_die (parent, cu);
18684 if (TYPE_DECLARED_CLASS (parent_type))
18686 if (TYPE_TAG_NAME (parent_type) != NULL)
18687 return TYPE_TAG_NAME (parent_type);
18690 /* Fall through. */
18692 return determine_prefix (parent, cu);
18696 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
18697 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
18698 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
18699 an obconcat, otherwise allocate storage for the result. The CU argument is
18700 used to determine the language and hence, the appropriate separator. */
18702 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
18705 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
18706 int physname, struct dwarf2_cu *cu)
18708 const char *lead = "";
18711 if (suffix == NULL || suffix[0] == '\0'
18712 || prefix == NULL || prefix[0] == '\0')
18714 else if (cu->language == language_java)
18716 else if (cu->language == language_fortran && physname)
18718 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
18719 DW_AT_MIPS_linkage_name is preferred and used instead. */
18727 if (prefix == NULL)
18729 if (suffix == NULL)
18735 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
18737 strcpy (retval, lead);
18738 strcat (retval, prefix);
18739 strcat (retval, sep);
18740 strcat (retval, suffix);
18745 /* We have an obstack. */
18746 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
18750 /* Return sibling of die, NULL if no sibling. */
18752 static struct die_info *
18753 sibling_die (struct die_info *die)
18755 return die->sibling;
18758 /* Get name of a die, return NULL if not found. */
18760 static const char *
18761 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
18762 struct obstack *obstack)
18764 if (name && cu->language == language_cplus)
18766 char *canon_name = cp_canonicalize_string (name);
18768 if (canon_name != NULL)
18770 if (strcmp (canon_name, name) != 0)
18771 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
18772 xfree (canon_name);
18779 /* Get name of a die, return NULL if not found. */
18781 static const char *
18782 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
18784 struct attribute *attr;
18786 attr = dwarf2_attr (die, DW_AT_name, cu);
18787 if ((!attr || !DW_STRING (attr))
18788 && die->tag != DW_TAG_class_type
18789 && die->tag != DW_TAG_interface_type
18790 && die->tag != DW_TAG_structure_type
18791 && die->tag != DW_TAG_union_type)
18796 case DW_TAG_compile_unit:
18797 case DW_TAG_partial_unit:
18798 /* Compilation units have a DW_AT_name that is a filename, not
18799 a source language identifier. */
18800 case DW_TAG_enumeration_type:
18801 case DW_TAG_enumerator:
18802 /* These tags always have simple identifiers already; no need
18803 to canonicalize them. */
18804 return DW_STRING (attr);
18806 case DW_TAG_subprogram:
18807 /* Java constructors will all be named "<init>", so return
18808 the class name when we see this special case. */
18809 if (cu->language == language_java
18810 && DW_STRING (attr) != NULL
18811 && strcmp (DW_STRING (attr), "<init>") == 0)
18813 struct dwarf2_cu *spec_cu = cu;
18814 struct die_info *spec_die;
18816 /* GCJ will output '<init>' for Java constructor names.
18817 For this special case, return the name of the parent class. */
18819 /* GCJ may output suprogram DIEs with AT_specification set.
18820 If so, use the name of the specified DIE. */
18821 spec_die = die_specification (die, &spec_cu);
18822 if (spec_die != NULL)
18823 return dwarf2_name (spec_die, spec_cu);
18828 if (die->tag == DW_TAG_class_type)
18829 return dwarf2_name (die, cu);
18831 while (die->tag != DW_TAG_compile_unit
18832 && die->tag != DW_TAG_partial_unit);
18836 case DW_TAG_class_type:
18837 case DW_TAG_interface_type:
18838 case DW_TAG_structure_type:
18839 case DW_TAG_union_type:
18840 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
18841 structures or unions. These were of the form "._%d" in GCC 4.1,
18842 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
18843 and GCC 4.4. We work around this problem by ignoring these. */
18844 if (attr && DW_STRING (attr)
18845 && (strncmp (DW_STRING (attr), "._", 2) == 0
18846 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
18849 /* GCC might emit a nameless typedef that has a linkage name. See
18850 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18851 if (!attr || DW_STRING (attr) == NULL)
18853 char *demangled = NULL;
18855 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18857 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18859 if (attr == NULL || DW_STRING (attr) == NULL)
18862 /* Avoid demangling DW_STRING (attr) the second time on a second
18863 call for the same DIE. */
18864 if (!DW_STRING_IS_CANONICAL (attr))
18865 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
18871 /* FIXME: we already did this for the partial symbol... */
18872 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
18873 demangled, strlen (demangled));
18874 DW_STRING_IS_CANONICAL (attr) = 1;
18877 /* Strip any leading namespaces/classes, keep only the base name.
18878 DW_AT_name for named DIEs does not contain the prefixes. */
18879 base = strrchr (DW_STRING (attr), ':');
18880 if (base && base > DW_STRING (attr) && base[-1] == ':')
18883 return DW_STRING (attr);
18892 if (!DW_STRING_IS_CANONICAL (attr))
18895 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
18896 &cu->objfile->objfile_obstack);
18897 DW_STRING_IS_CANONICAL (attr) = 1;
18899 return DW_STRING (attr);
18902 /* Return the die that this die in an extension of, or NULL if there
18903 is none. *EXT_CU is the CU containing DIE on input, and the CU
18904 containing the return value on output. */
18906 static struct die_info *
18907 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
18909 struct attribute *attr;
18911 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
18915 return follow_die_ref (die, attr, ext_cu);
18918 /* Convert a DIE tag into its string name. */
18920 static const char *
18921 dwarf_tag_name (unsigned tag)
18923 const char *name = get_DW_TAG_name (tag);
18926 return "DW_TAG_<unknown>";
18931 /* Convert a DWARF attribute code into its string name. */
18933 static const char *
18934 dwarf_attr_name (unsigned attr)
18938 #ifdef MIPS /* collides with DW_AT_HP_block_index */
18939 if (attr == DW_AT_MIPS_fde)
18940 return "DW_AT_MIPS_fde";
18942 if (attr == DW_AT_HP_block_index)
18943 return "DW_AT_HP_block_index";
18946 name = get_DW_AT_name (attr);
18949 return "DW_AT_<unknown>";
18954 /* Convert a DWARF value form code into its string name. */
18956 static const char *
18957 dwarf_form_name (unsigned form)
18959 const char *name = get_DW_FORM_name (form);
18962 return "DW_FORM_<unknown>";
18968 dwarf_bool_name (unsigned mybool)
18976 /* Convert a DWARF type code into its string name. */
18978 static const char *
18979 dwarf_type_encoding_name (unsigned enc)
18981 const char *name = get_DW_ATE_name (enc);
18984 return "DW_ATE_<unknown>";
18990 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
18994 print_spaces (indent, f);
18995 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
18996 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
18998 if (die->parent != NULL)
19000 print_spaces (indent, f);
19001 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
19002 die->parent->offset.sect_off);
19005 print_spaces (indent, f);
19006 fprintf_unfiltered (f, " has children: %s\n",
19007 dwarf_bool_name (die->child != NULL));
19009 print_spaces (indent, f);
19010 fprintf_unfiltered (f, " attributes:\n");
19012 for (i = 0; i < die->num_attrs; ++i)
19014 print_spaces (indent, f);
19015 fprintf_unfiltered (f, " %s (%s) ",
19016 dwarf_attr_name (die->attrs[i].name),
19017 dwarf_form_name (die->attrs[i].form));
19019 switch (die->attrs[i].form)
19022 case DW_FORM_GNU_addr_index:
19023 fprintf_unfiltered (f, "address: ");
19024 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
19026 case DW_FORM_block2:
19027 case DW_FORM_block4:
19028 case DW_FORM_block:
19029 case DW_FORM_block1:
19030 fprintf_unfiltered (f, "block: size %s",
19031 pulongest (DW_BLOCK (&die->attrs[i])->size));
19033 case DW_FORM_exprloc:
19034 fprintf_unfiltered (f, "expression: size %s",
19035 pulongest (DW_BLOCK (&die->attrs[i])->size));
19037 case DW_FORM_ref_addr:
19038 fprintf_unfiltered (f, "ref address: ");
19039 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19041 case DW_FORM_GNU_ref_alt:
19042 fprintf_unfiltered (f, "alt ref address: ");
19043 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19049 case DW_FORM_ref_udata:
19050 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
19051 (long) (DW_UNSND (&die->attrs[i])));
19053 case DW_FORM_data1:
19054 case DW_FORM_data2:
19055 case DW_FORM_data4:
19056 case DW_FORM_data8:
19057 case DW_FORM_udata:
19058 case DW_FORM_sdata:
19059 fprintf_unfiltered (f, "constant: %s",
19060 pulongest (DW_UNSND (&die->attrs[i])));
19062 case DW_FORM_sec_offset:
19063 fprintf_unfiltered (f, "section offset: %s",
19064 pulongest (DW_UNSND (&die->attrs[i])));
19066 case DW_FORM_ref_sig8:
19067 fprintf_unfiltered (f, "signature: %s",
19068 hex_string (DW_SIGNATURE (&die->attrs[i])));
19070 case DW_FORM_string:
19072 case DW_FORM_GNU_str_index:
19073 case DW_FORM_GNU_strp_alt:
19074 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
19075 DW_STRING (&die->attrs[i])
19076 ? DW_STRING (&die->attrs[i]) : "",
19077 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
19080 if (DW_UNSND (&die->attrs[i]))
19081 fprintf_unfiltered (f, "flag: TRUE");
19083 fprintf_unfiltered (f, "flag: FALSE");
19085 case DW_FORM_flag_present:
19086 fprintf_unfiltered (f, "flag: TRUE");
19088 case DW_FORM_indirect:
19089 /* The reader will have reduced the indirect form to
19090 the "base form" so this form should not occur. */
19091 fprintf_unfiltered (f,
19092 "unexpected attribute form: DW_FORM_indirect");
19095 fprintf_unfiltered (f, "unsupported attribute form: %d.",
19096 die->attrs[i].form);
19099 fprintf_unfiltered (f, "\n");
19104 dump_die_for_error (struct die_info *die)
19106 dump_die_shallow (gdb_stderr, 0, die);
19110 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
19112 int indent = level * 4;
19114 gdb_assert (die != NULL);
19116 if (level >= max_level)
19119 dump_die_shallow (f, indent, die);
19121 if (die->child != NULL)
19123 print_spaces (indent, f);
19124 fprintf_unfiltered (f, " Children:");
19125 if (level + 1 < max_level)
19127 fprintf_unfiltered (f, "\n");
19128 dump_die_1 (f, level + 1, max_level, die->child);
19132 fprintf_unfiltered (f,
19133 " [not printed, max nesting level reached]\n");
19137 if (die->sibling != NULL && level > 0)
19139 dump_die_1 (f, level, max_level, die->sibling);
19143 /* This is called from the pdie macro in gdbinit.in.
19144 It's not static so gcc will keep a copy callable from gdb. */
19147 dump_die (struct die_info *die, int max_level)
19149 dump_die_1 (gdb_stdlog, 0, max_level, die);
19153 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
19157 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
19163 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
19167 dwarf2_get_ref_die_offset (const struct attribute *attr)
19169 sect_offset retval = { DW_UNSND (attr) };
19171 if (attr_form_is_ref (attr))
19174 retval.sect_off = 0;
19175 complaint (&symfile_complaints,
19176 _("unsupported die ref attribute form: '%s'"),
19177 dwarf_form_name (attr->form));
19181 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
19182 * the value held by the attribute is not constant. */
19185 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
19187 if (attr->form == DW_FORM_sdata)
19188 return DW_SND (attr);
19189 else if (attr->form == DW_FORM_udata
19190 || attr->form == DW_FORM_data1
19191 || attr->form == DW_FORM_data2
19192 || attr->form == DW_FORM_data4
19193 || attr->form == DW_FORM_data8)
19194 return DW_UNSND (attr);
19197 complaint (&symfile_complaints,
19198 _("Attribute value is not a constant (%s)"),
19199 dwarf_form_name (attr->form));
19200 return default_value;
19204 /* Follow reference or signature attribute ATTR of SRC_DIE.
19205 On entry *REF_CU is the CU of SRC_DIE.
19206 On exit *REF_CU is the CU of the result. */
19208 static struct die_info *
19209 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
19210 struct dwarf2_cu **ref_cu)
19212 struct die_info *die;
19214 if (attr_form_is_ref (attr))
19215 die = follow_die_ref (src_die, attr, ref_cu);
19216 else if (attr->form == DW_FORM_ref_sig8)
19217 die = follow_die_sig (src_die, attr, ref_cu);
19220 dump_die_for_error (src_die);
19221 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
19222 objfile_name ((*ref_cu)->objfile));
19228 /* Follow reference OFFSET.
19229 On entry *REF_CU is the CU of the source die referencing OFFSET.
19230 On exit *REF_CU is the CU of the result.
19231 Returns NULL if OFFSET is invalid. */
19233 static struct die_info *
19234 follow_die_offset (sect_offset offset, int offset_in_dwz,
19235 struct dwarf2_cu **ref_cu)
19237 struct die_info temp_die;
19238 struct dwarf2_cu *target_cu, *cu = *ref_cu;
19240 gdb_assert (cu->per_cu != NULL);
19244 if (cu->per_cu->is_debug_types)
19246 /* .debug_types CUs cannot reference anything outside their CU.
19247 If they need to, they have to reference a signatured type via
19248 DW_FORM_ref_sig8. */
19249 if (! offset_in_cu_p (&cu->header, offset))
19252 else if (offset_in_dwz != cu->per_cu->is_dwz
19253 || ! offset_in_cu_p (&cu->header, offset))
19255 struct dwarf2_per_cu_data *per_cu;
19257 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
19260 /* If necessary, add it to the queue and load its DIEs. */
19261 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
19262 load_full_comp_unit (per_cu, cu->language);
19264 target_cu = per_cu->cu;
19266 else if (cu->dies == NULL)
19268 /* We're loading full DIEs during partial symbol reading. */
19269 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
19270 load_full_comp_unit (cu->per_cu, language_minimal);
19273 *ref_cu = target_cu;
19274 temp_die.offset = offset;
19275 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
19278 /* Follow reference attribute ATTR of SRC_DIE.
19279 On entry *REF_CU is the CU of SRC_DIE.
19280 On exit *REF_CU is the CU of the result. */
19282 static struct die_info *
19283 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
19284 struct dwarf2_cu **ref_cu)
19286 sect_offset offset = dwarf2_get_ref_die_offset (attr);
19287 struct dwarf2_cu *cu = *ref_cu;
19288 struct die_info *die;
19290 die = follow_die_offset (offset,
19291 (attr->form == DW_FORM_GNU_ref_alt
19292 || cu->per_cu->is_dwz),
19295 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
19296 "at 0x%x [in module %s]"),
19297 offset.sect_off, src_die->offset.sect_off,
19298 objfile_name (cu->objfile));
19303 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
19304 Returned value is intended for DW_OP_call*. Returned
19305 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
19307 struct dwarf2_locexpr_baton
19308 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
19309 struct dwarf2_per_cu_data *per_cu,
19310 CORE_ADDR (*get_frame_pc) (void *baton),
19313 struct dwarf2_cu *cu;
19314 struct die_info *die;
19315 struct attribute *attr;
19316 struct dwarf2_locexpr_baton retval;
19318 dw2_setup (per_cu->objfile);
19320 if (per_cu->cu == NULL)
19324 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19326 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19327 offset.sect_off, objfile_name (per_cu->objfile));
19329 attr = dwarf2_attr (die, DW_AT_location, cu);
19332 /* DWARF: "If there is no such attribute, then there is no effect.".
19333 DATA is ignored if SIZE is 0. */
19335 retval.data = NULL;
19338 else if (attr_form_is_section_offset (attr))
19340 struct dwarf2_loclist_baton loclist_baton;
19341 CORE_ADDR pc = (*get_frame_pc) (baton);
19344 fill_in_loclist_baton (cu, &loclist_baton, attr);
19346 retval.data = dwarf2_find_location_expression (&loclist_baton,
19348 retval.size = size;
19352 if (!attr_form_is_block (attr))
19353 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
19354 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
19355 offset.sect_off, objfile_name (per_cu->objfile));
19357 retval.data = DW_BLOCK (attr)->data;
19358 retval.size = DW_BLOCK (attr)->size;
19360 retval.per_cu = cu->per_cu;
19362 age_cached_comp_units ();
19367 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
19370 struct dwarf2_locexpr_baton
19371 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
19372 struct dwarf2_per_cu_data *per_cu,
19373 CORE_ADDR (*get_frame_pc) (void *baton),
19376 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
19378 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
19381 /* Write a constant of a given type as target-ordered bytes into
19384 static const gdb_byte *
19385 write_constant_as_bytes (struct obstack *obstack,
19386 enum bfd_endian byte_order,
19393 *len = TYPE_LENGTH (type);
19394 result = obstack_alloc (obstack, *len);
19395 store_unsigned_integer (result, *len, byte_order, value);
19400 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
19401 pointer to the constant bytes and set LEN to the length of the
19402 data. If memory is needed, allocate it on OBSTACK. If the DIE
19403 does not have a DW_AT_const_value, return NULL. */
19406 dwarf2_fetch_constant_bytes (sect_offset offset,
19407 struct dwarf2_per_cu_data *per_cu,
19408 struct obstack *obstack,
19411 struct dwarf2_cu *cu;
19412 struct die_info *die;
19413 struct attribute *attr;
19414 const gdb_byte *result = NULL;
19417 enum bfd_endian byte_order;
19419 dw2_setup (per_cu->objfile);
19421 if (per_cu->cu == NULL)
19425 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19427 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19428 offset.sect_off, objfile_name (per_cu->objfile));
19431 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19435 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
19436 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19438 switch (attr->form)
19441 case DW_FORM_GNU_addr_index:
19445 *len = cu->header.addr_size;
19446 tem = obstack_alloc (obstack, *len);
19447 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
19451 case DW_FORM_string:
19453 case DW_FORM_GNU_str_index:
19454 case DW_FORM_GNU_strp_alt:
19455 /* DW_STRING is already allocated on the objfile obstack, point
19457 result = (const gdb_byte *) DW_STRING (attr);
19458 *len = strlen (DW_STRING (attr));
19460 case DW_FORM_block1:
19461 case DW_FORM_block2:
19462 case DW_FORM_block4:
19463 case DW_FORM_block:
19464 case DW_FORM_exprloc:
19465 result = DW_BLOCK (attr)->data;
19466 *len = DW_BLOCK (attr)->size;
19469 /* The DW_AT_const_value attributes are supposed to carry the
19470 symbol's value "represented as it would be on the target
19471 architecture." By the time we get here, it's already been
19472 converted to host endianness, so we just need to sign- or
19473 zero-extend it as appropriate. */
19474 case DW_FORM_data1:
19475 type = die_type (die, cu);
19476 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
19477 if (result == NULL)
19478 result = write_constant_as_bytes (obstack, byte_order,
19481 case DW_FORM_data2:
19482 type = die_type (die, cu);
19483 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
19484 if (result == NULL)
19485 result = write_constant_as_bytes (obstack, byte_order,
19488 case DW_FORM_data4:
19489 type = die_type (die, cu);
19490 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
19491 if (result == NULL)
19492 result = write_constant_as_bytes (obstack, byte_order,
19495 case DW_FORM_data8:
19496 type = die_type (die, cu);
19497 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
19498 if (result == NULL)
19499 result = write_constant_as_bytes (obstack, byte_order,
19503 case DW_FORM_sdata:
19504 type = die_type (die, cu);
19505 result = write_constant_as_bytes (obstack, byte_order,
19506 type, DW_SND (attr), len);
19509 case DW_FORM_udata:
19510 type = die_type (die, cu);
19511 result = write_constant_as_bytes (obstack, byte_order,
19512 type, DW_UNSND (attr), len);
19516 complaint (&symfile_complaints,
19517 _("unsupported const value attribute form: '%s'"),
19518 dwarf_form_name (attr->form));
19525 /* Return the type of the DIE at DIE_OFFSET in the CU named by
19529 dwarf2_get_die_type (cu_offset die_offset,
19530 struct dwarf2_per_cu_data *per_cu)
19532 sect_offset die_offset_sect;
19534 dw2_setup (per_cu->objfile);
19536 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
19537 return get_die_type_at_offset (die_offset_sect, per_cu);
19540 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
19541 On entry *REF_CU is the CU of SRC_DIE.
19542 On exit *REF_CU is the CU of the result.
19543 Returns NULL if the referenced DIE isn't found. */
19545 static struct die_info *
19546 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
19547 struct dwarf2_cu **ref_cu)
19549 struct objfile *objfile = (*ref_cu)->objfile;
19550 struct die_info temp_die;
19551 struct dwarf2_cu *sig_cu;
19552 struct die_info *die;
19554 /* While it might be nice to assert sig_type->type == NULL here,
19555 we can get here for DW_AT_imported_declaration where we need
19556 the DIE not the type. */
19558 /* If necessary, add it to the queue and load its DIEs. */
19560 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
19561 read_signatured_type (sig_type);
19563 sig_cu = sig_type->per_cu.cu;
19564 gdb_assert (sig_cu != NULL);
19565 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
19566 temp_die.offset = sig_type->type_offset_in_section;
19567 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
19568 temp_die.offset.sect_off);
19571 /* For .gdb_index version 7 keep track of included TUs.
19572 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
19573 if (dwarf2_per_objfile->index_table != NULL
19574 && dwarf2_per_objfile->index_table->version <= 7)
19576 VEC_safe_push (dwarf2_per_cu_ptr,
19577 (*ref_cu)->per_cu->imported_symtabs,
19588 /* Follow signatured type referenced by ATTR in SRC_DIE.
19589 On entry *REF_CU is the CU of SRC_DIE.
19590 On exit *REF_CU is the CU of the result.
19591 The result is the DIE of the type.
19592 If the referenced type cannot be found an error is thrown. */
19594 static struct die_info *
19595 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
19596 struct dwarf2_cu **ref_cu)
19598 ULONGEST signature = DW_SIGNATURE (attr);
19599 struct signatured_type *sig_type;
19600 struct die_info *die;
19602 gdb_assert (attr->form == DW_FORM_ref_sig8);
19604 sig_type = lookup_signatured_type (*ref_cu, signature);
19605 /* sig_type will be NULL if the signatured type is missing from
19607 if (sig_type == NULL)
19609 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
19610 " from DIE at 0x%x [in module %s]"),
19611 hex_string (signature), src_die->offset.sect_off,
19612 objfile_name ((*ref_cu)->objfile));
19615 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
19618 dump_die_for_error (src_die);
19619 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
19620 " from DIE at 0x%x [in module %s]"),
19621 hex_string (signature), src_die->offset.sect_off,
19622 objfile_name ((*ref_cu)->objfile));
19628 /* Get the type specified by SIGNATURE referenced in DIE/CU,
19629 reading in and processing the type unit if necessary. */
19631 static struct type *
19632 get_signatured_type (struct die_info *die, ULONGEST signature,
19633 struct dwarf2_cu *cu)
19635 struct signatured_type *sig_type;
19636 struct dwarf2_cu *type_cu;
19637 struct die_info *type_die;
19640 sig_type = lookup_signatured_type (cu, signature);
19641 /* sig_type will be NULL if the signatured type is missing from
19643 if (sig_type == NULL)
19645 complaint (&symfile_complaints,
19646 _("Dwarf Error: Cannot find signatured DIE %s referenced"
19647 " from DIE at 0x%x [in module %s]"),
19648 hex_string (signature), die->offset.sect_off,
19649 objfile_name (dwarf2_per_objfile->objfile));
19650 return build_error_marker_type (cu, die);
19653 /* If we already know the type we're done. */
19654 if (sig_type->type != NULL)
19655 return sig_type->type;
19658 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
19659 if (type_die != NULL)
19661 /* N.B. We need to call get_die_type to ensure only one type for this DIE
19662 is created. This is important, for example, because for c++ classes
19663 we need TYPE_NAME set which is only done by new_symbol. Blech. */
19664 type = read_type_die (type_die, type_cu);
19667 complaint (&symfile_complaints,
19668 _("Dwarf Error: Cannot build signatured type %s"
19669 " referenced from DIE at 0x%x [in module %s]"),
19670 hex_string (signature), die->offset.sect_off,
19671 objfile_name (dwarf2_per_objfile->objfile));
19672 type = build_error_marker_type (cu, die);
19677 complaint (&symfile_complaints,
19678 _("Dwarf Error: Problem reading signatured DIE %s referenced"
19679 " from DIE at 0x%x [in module %s]"),
19680 hex_string (signature), die->offset.sect_off,
19681 objfile_name (dwarf2_per_objfile->objfile));
19682 type = build_error_marker_type (cu, die);
19684 sig_type->type = type;
19689 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
19690 reading in and processing the type unit if necessary. */
19692 static struct type *
19693 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
19694 struct dwarf2_cu *cu) /* ARI: editCase function */
19696 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
19697 if (attr_form_is_ref (attr))
19699 struct dwarf2_cu *type_cu = cu;
19700 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
19702 return read_type_die (type_die, type_cu);
19704 else if (attr->form == DW_FORM_ref_sig8)
19706 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
19710 complaint (&symfile_complaints,
19711 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
19712 " at 0x%x [in module %s]"),
19713 dwarf_form_name (attr->form), die->offset.sect_off,
19714 objfile_name (dwarf2_per_objfile->objfile));
19715 return build_error_marker_type (cu, die);
19719 /* Load the DIEs associated with type unit PER_CU into memory. */
19722 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
19724 struct signatured_type *sig_type;
19726 /* Caller is responsible for ensuring type_unit_groups don't get here. */
19727 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
19729 /* We have the per_cu, but we need the signatured_type.
19730 Fortunately this is an easy translation. */
19731 gdb_assert (per_cu->is_debug_types);
19732 sig_type = (struct signatured_type *) per_cu;
19734 gdb_assert (per_cu->cu == NULL);
19736 read_signatured_type (sig_type);
19738 gdb_assert (per_cu->cu != NULL);
19741 /* die_reader_func for read_signatured_type.
19742 This is identical to load_full_comp_unit_reader,
19743 but is kept separate for now. */
19746 read_signatured_type_reader (const struct die_reader_specs *reader,
19747 const gdb_byte *info_ptr,
19748 struct die_info *comp_unit_die,
19752 struct dwarf2_cu *cu = reader->cu;
19754 gdb_assert (cu->die_hash == NULL);
19756 htab_create_alloc_ex (cu->header.length / 12,
19760 &cu->comp_unit_obstack,
19761 hashtab_obstack_allocate,
19762 dummy_obstack_deallocate);
19765 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
19766 &info_ptr, comp_unit_die);
19767 cu->dies = comp_unit_die;
19768 /* comp_unit_die is not stored in die_hash, no need. */
19770 /* We try not to read any attributes in this function, because not
19771 all CUs needed for references have been loaded yet, and symbol
19772 table processing isn't initialized. But we have to set the CU language,
19773 or we won't be able to build types correctly.
19774 Similarly, if we do not read the producer, we can not apply
19775 producer-specific interpretation. */
19776 prepare_one_comp_unit (cu, cu->dies, language_minimal);
19779 /* Read in a signatured type and build its CU and DIEs.
19780 If the type is a stub for the real type in a DWO file,
19781 read in the real type from the DWO file as well. */
19784 read_signatured_type (struct signatured_type *sig_type)
19786 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
19788 gdb_assert (per_cu->is_debug_types);
19789 gdb_assert (per_cu->cu == NULL);
19791 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
19792 read_signatured_type_reader, NULL);
19793 sig_type->per_cu.tu_read = 1;
19796 /* Decode simple location descriptions.
19797 Given a pointer to a dwarf block that defines a location, compute
19798 the location and return the value.
19800 NOTE drow/2003-11-18: This function is called in two situations
19801 now: for the address of static or global variables (partial symbols
19802 only) and for offsets into structures which are expected to be
19803 (more or less) constant. The partial symbol case should go away,
19804 and only the constant case should remain. That will let this
19805 function complain more accurately. A few special modes are allowed
19806 without complaint for global variables (for instance, global
19807 register values and thread-local values).
19809 A location description containing no operations indicates that the
19810 object is optimized out. The return value is 0 for that case.
19811 FIXME drow/2003-11-16: No callers check for this case any more; soon all
19812 callers will only want a very basic result and this can become a
19815 Note that stack[0] is unused except as a default error return. */
19818 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
19820 struct objfile *objfile = cu->objfile;
19822 size_t size = blk->size;
19823 const gdb_byte *data = blk->data;
19824 CORE_ADDR stack[64];
19826 unsigned int bytes_read, unsnd;
19832 stack[++stacki] = 0;
19871 stack[++stacki] = op - DW_OP_lit0;
19906 stack[++stacki] = op - DW_OP_reg0;
19908 dwarf2_complex_location_expr_complaint ();
19912 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
19914 stack[++stacki] = unsnd;
19916 dwarf2_complex_location_expr_complaint ();
19920 stack[++stacki] = read_address (objfile->obfd, &data[i],
19925 case DW_OP_const1u:
19926 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
19930 case DW_OP_const1s:
19931 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
19935 case DW_OP_const2u:
19936 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
19940 case DW_OP_const2s:
19941 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
19945 case DW_OP_const4u:
19946 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
19950 case DW_OP_const4s:
19951 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
19955 case DW_OP_const8u:
19956 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
19961 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
19967 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
19972 stack[stacki + 1] = stack[stacki];
19977 stack[stacki - 1] += stack[stacki];
19981 case DW_OP_plus_uconst:
19982 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
19988 stack[stacki - 1] -= stack[stacki];
19993 /* If we're not the last op, then we definitely can't encode
19994 this using GDB's address_class enum. This is valid for partial
19995 global symbols, although the variable's address will be bogus
19998 dwarf2_complex_location_expr_complaint ();
20001 case DW_OP_GNU_push_tls_address:
20002 /* The top of the stack has the offset from the beginning
20003 of the thread control block at which the variable is located. */
20004 /* Nothing should follow this operator, so the top of stack would
20006 /* This is valid for partial global symbols, but the variable's
20007 address will be bogus in the psymtab. Make it always at least
20008 non-zero to not look as a variable garbage collected by linker
20009 which have DW_OP_addr 0. */
20011 dwarf2_complex_location_expr_complaint ();
20015 case DW_OP_GNU_uninit:
20018 case DW_OP_GNU_addr_index:
20019 case DW_OP_GNU_const_index:
20020 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
20027 const char *name = get_DW_OP_name (op);
20030 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
20033 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
20037 return (stack[stacki]);
20040 /* Enforce maximum stack depth of SIZE-1 to avoid writing
20041 outside of the allocated space. Also enforce minimum>0. */
20042 if (stacki >= ARRAY_SIZE (stack) - 1)
20044 complaint (&symfile_complaints,
20045 _("location description stack overflow"));
20051 complaint (&symfile_complaints,
20052 _("location description stack underflow"));
20056 return (stack[stacki]);
20059 /* memory allocation interface */
20061 static struct dwarf_block *
20062 dwarf_alloc_block (struct dwarf2_cu *cu)
20064 struct dwarf_block *blk;
20066 blk = (struct dwarf_block *)
20067 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
20071 static struct die_info *
20072 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
20074 struct die_info *die;
20075 size_t size = sizeof (struct die_info);
20078 size += (num_attrs - 1) * sizeof (struct attribute);
20080 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
20081 memset (die, 0, sizeof (struct die_info));
20086 /* Macro support. */
20088 /* Return file name relative to the compilation directory of file number I in
20089 *LH's file name table. The result is allocated using xmalloc; the caller is
20090 responsible for freeing it. */
20093 file_file_name (int file, struct line_header *lh)
20095 /* Is the file number a valid index into the line header's file name
20096 table? Remember that file numbers start with one, not zero. */
20097 if (1 <= file && file <= lh->num_file_names)
20099 struct file_entry *fe = &lh->file_names[file - 1];
20101 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
20102 return xstrdup (fe->name);
20103 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
20108 /* The compiler produced a bogus file number. We can at least
20109 record the macro definitions made in the file, even if we
20110 won't be able to find the file by name. */
20111 char fake_name[80];
20113 xsnprintf (fake_name, sizeof (fake_name),
20114 "<bad macro file number %d>", file);
20116 complaint (&symfile_complaints,
20117 _("bad file number in macro information (%d)"),
20120 return xstrdup (fake_name);
20124 /* Return the full name of file number I in *LH's file name table.
20125 Use COMP_DIR as the name of the current directory of the
20126 compilation. The result is allocated using xmalloc; the caller is
20127 responsible for freeing it. */
20129 file_full_name (int file, struct line_header *lh, const char *comp_dir)
20131 /* Is the file number a valid index into the line header's file name
20132 table? Remember that file numbers start with one, not zero. */
20133 if (1 <= file && file <= lh->num_file_names)
20135 char *relative = file_file_name (file, lh);
20137 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
20139 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
20142 return file_file_name (file, lh);
20146 static struct macro_source_file *
20147 macro_start_file (int file, int line,
20148 struct macro_source_file *current_file,
20149 const char *comp_dir,
20150 struct line_header *lh, struct objfile *objfile)
20152 /* File name relative to the compilation directory of this source file. */
20153 char *file_name = file_file_name (file, lh);
20155 if (! current_file)
20157 /* Note: We don't create a macro table for this compilation unit
20158 at all until we actually get a filename. */
20159 struct macro_table *macro_table = get_macro_table (objfile, comp_dir);
20161 /* If we have no current file, then this must be the start_file
20162 directive for the compilation unit's main source file. */
20163 current_file = macro_set_main (macro_table, file_name);
20164 macro_define_special (macro_table);
20167 current_file = macro_include (current_file, line, file_name);
20171 return current_file;
20175 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
20176 followed by a null byte. */
20178 copy_string (const char *buf, int len)
20180 char *s = xmalloc (len + 1);
20182 memcpy (s, buf, len);
20188 static const char *
20189 consume_improper_spaces (const char *p, const char *body)
20193 complaint (&symfile_complaints,
20194 _("macro definition contains spaces "
20195 "in formal argument list:\n`%s'"),
20207 parse_macro_definition (struct macro_source_file *file, int line,
20212 /* The body string takes one of two forms. For object-like macro
20213 definitions, it should be:
20215 <macro name> " " <definition>
20217 For function-like macro definitions, it should be:
20219 <macro name> "() " <definition>
20221 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
20223 Spaces may appear only where explicitly indicated, and in the
20226 The Dwarf 2 spec says that an object-like macro's name is always
20227 followed by a space, but versions of GCC around March 2002 omit
20228 the space when the macro's definition is the empty string.
20230 The Dwarf 2 spec says that there should be no spaces between the
20231 formal arguments in a function-like macro's formal argument list,
20232 but versions of GCC around March 2002 include spaces after the
20236 /* Find the extent of the macro name. The macro name is terminated
20237 by either a space or null character (for an object-like macro) or
20238 an opening paren (for a function-like macro). */
20239 for (p = body; *p; p++)
20240 if (*p == ' ' || *p == '(')
20243 if (*p == ' ' || *p == '\0')
20245 /* It's an object-like macro. */
20246 int name_len = p - body;
20247 char *name = copy_string (body, name_len);
20248 const char *replacement;
20251 replacement = body + name_len + 1;
20254 dwarf2_macro_malformed_definition_complaint (body);
20255 replacement = body + name_len;
20258 macro_define_object (file, line, name, replacement);
20262 else if (*p == '(')
20264 /* It's a function-like macro. */
20265 char *name = copy_string (body, p - body);
20268 char **argv = xmalloc (argv_size * sizeof (*argv));
20272 p = consume_improper_spaces (p, body);
20274 /* Parse the formal argument list. */
20275 while (*p && *p != ')')
20277 /* Find the extent of the current argument name. */
20278 const char *arg_start = p;
20280 while (*p && *p != ',' && *p != ')' && *p != ' ')
20283 if (! *p || p == arg_start)
20284 dwarf2_macro_malformed_definition_complaint (body);
20287 /* Make sure argv has room for the new argument. */
20288 if (argc >= argv_size)
20291 argv = xrealloc (argv, argv_size * sizeof (*argv));
20294 argv[argc++] = copy_string (arg_start, p - arg_start);
20297 p = consume_improper_spaces (p, body);
20299 /* Consume the comma, if present. */
20304 p = consume_improper_spaces (p, body);
20313 /* Perfectly formed definition, no complaints. */
20314 macro_define_function (file, line, name,
20315 argc, (const char **) argv,
20317 else if (*p == '\0')
20319 /* Complain, but do define it. */
20320 dwarf2_macro_malformed_definition_complaint (body);
20321 macro_define_function (file, line, name,
20322 argc, (const char **) argv,
20326 /* Just complain. */
20327 dwarf2_macro_malformed_definition_complaint (body);
20330 /* Just complain. */
20331 dwarf2_macro_malformed_definition_complaint (body);
20337 for (i = 0; i < argc; i++)
20343 dwarf2_macro_malformed_definition_complaint (body);
20346 /* Skip some bytes from BYTES according to the form given in FORM.
20347 Returns the new pointer. */
20349 static const gdb_byte *
20350 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
20351 enum dwarf_form form,
20352 unsigned int offset_size,
20353 struct dwarf2_section_info *section)
20355 unsigned int bytes_read;
20359 case DW_FORM_data1:
20364 case DW_FORM_data2:
20368 case DW_FORM_data4:
20372 case DW_FORM_data8:
20376 case DW_FORM_string:
20377 read_direct_string (abfd, bytes, &bytes_read);
20378 bytes += bytes_read;
20381 case DW_FORM_sec_offset:
20383 case DW_FORM_GNU_strp_alt:
20384 bytes += offset_size;
20387 case DW_FORM_block:
20388 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
20389 bytes += bytes_read;
20392 case DW_FORM_block1:
20393 bytes += 1 + read_1_byte (abfd, bytes);
20395 case DW_FORM_block2:
20396 bytes += 2 + read_2_bytes (abfd, bytes);
20398 case DW_FORM_block4:
20399 bytes += 4 + read_4_bytes (abfd, bytes);
20402 case DW_FORM_sdata:
20403 case DW_FORM_udata:
20404 case DW_FORM_GNU_addr_index:
20405 case DW_FORM_GNU_str_index:
20406 bytes = gdb_skip_leb128 (bytes, buffer_end);
20409 dwarf2_section_buffer_overflow_complaint (section);
20417 complaint (&symfile_complaints,
20418 _("invalid form 0x%x in `%s'"),
20419 form, get_section_name (section));
20427 /* A helper for dwarf_decode_macros that handles skipping an unknown
20428 opcode. Returns an updated pointer to the macro data buffer; or,
20429 on error, issues a complaint and returns NULL. */
20431 static const gdb_byte *
20432 skip_unknown_opcode (unsigned int opcode,
20433 const gdb_byte **opcode_definitions,
20434 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20436 unsigned int offset_size,
20437 struct dwarf2_section_info *section)
20439 unsigned int bytes_read, i;
20441 const gdb_byte *defn;
20443 if (opcode_definitions[opcode] == NULL)
20445 complaint (&symfile_complaints,
20446 _("unrecognized DW_MACFINO opcode 0x%x"),
20451 defn = opcode_definitions[opcode];
20452 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
20453 defn += bytes_read;
20455 for (i = 0; i < arg; ++i)
20457 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
20459 if (mac_ptr == NULL)
20461 /* skip_form_bytes already issued the complaint. */
20469 /* A helper function which parses the header of a macro section.
20470 If the macro section is the extended (for now called "GNU") type,
20471 then this updates *OFFSET_SIZE. Returns a pointer to just after
20472 the header, or issues a complaint and returns NULL on error. */
20474 static const gdb_byte *
20475 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
20477 const gdb_byte *mac_ptr,
20478 unsigned int *offset_size,
20479 int section_is_gnu)
20481 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
20483 if (section_is_gnu)
20485 unsigned int version, flags;
20487 version = read_2_bytes (abfd, mac_ptr);
20490 complaint (&symfile_complaints,
20491 _("unrecognized version `%d' in .debug_macro section"),
20497 flags = read_1_byte (abfd, mac_ptr);
20499 *offset_size = (flags & 1) ? 8 : 4;
20501 if ((flags & 2) != 0)
20502 /* We don't need the line table offset. */
20503 mac_ptr += *offset_size;
20505 /* Vendor opcode descriptions. */
20506 if ((flags & 4) != 0)
20508 unsigned int i, count;
20510 count = read_1_byte (abfd, mac_ptr);
20512 for (i = 0; i < count; ++i)
20514 unsigned int opcode, bytes_read;
20517 opcode = read_1_byte (abfd, mac_ptr);
20519 opcode_definitions[opcode] = mac_ptr;
20520 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20521 mac_ptr += bytes_read;
20530 /* A helper for dwarf_decode_macros that handles the GNU extensions,
20531 including DW_MACRO_GNU_transparent_include. */
20534 dwarf_decode_macro_bytes (bfd *abfd,
20535 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20536 struct macro_source_file *current_file,
20537 struct line_header *lh, const char *comp_dir,
20538 struct dwarf2_section_info *section,
20539 int section_is_gnu, int section_is_dwz,
20540 unsigned int offset_size,
20541 struct objfile *objfile,
20542 htab_t include_hash)
20544 enum dwarf_macro_record_type macinfo_type;
20545 int at_commandline;
20546 const gdb_byte *opcode_definitions[256];
20548 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20549 &offset_size, section_is_gnu);
20550 if (mac_ptr == NULL)
20552 /* We already issued a complaint. */
20556 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
20557 GDB is still reading the definitions from command line. First
20558 DW_MACINFO_start_file will need to be ignored as it was already executed
20559 to create CURRENT_FILE for the main source holding also the command line
20560 definitions. On first met DW_MACINFO_start_file this flag is reset to
20561 normally execute all the remaining DW_MACINFO_start_file macinfos. */
20563 at_commandline = 1;
20567 /* Do we at least have room for a macinfo type byte? */
20568 if (mac_ptr >= mac_end)
20570 dwarf2_section_buffer_overflow_complaint (section);
20574 macinfo_type = read_1_byte (abfd, mac_ptr);
20577 /* Note that we rely on the fact that the corresponding GNU and
20578 DWARF constants are the same. */
20579 switch (macinfo_type)
20581 /* A zero macinfo type indicates the end of the macro
20586 case DW_MACRO_GNU_define:
20587 case DW_MACRO_GNU_undef:
20588 case DW_MACRO_GNU_define_indirect:
20589 case DW_MACRO_GNU_undef_indirect:
20590 case DW_MACRO_GNU_define_indirect_alt:
20591 case DW_MACRO_GNU_undef_indirect_alt:
20593 unsigned int bytes_read;
20598 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20599 mac_ptr += bytes_read;
20601 if (macinfo_type == DW_MACRO_GNU_define
20602 || macinfo_type == DW_MACRO_GNU_undef)
20604 body = read_direct_string (abfd, mac_ptr, &bytes_read);
20605 mac_ptr += bytes_read;
20609 LONGEST str_offset;
20611 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
20612 mac_ptr += offset_size;
20614 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
20615 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
20618 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20620 body = read_indirect_string_from_dwz (dwz, str_offset);
20623 body = read_indirect_string_at_offset (abfd, str_offset);
20626 is_define = (macinfo_type == DW_MACRO_GNU_define
20627 || macinfo_type == DW_MACRO_GNU_define_indirect
20628 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
20629 if (! current_file)
20631 /* DWARF violation as no main source is present. */
20632 complaint (&symfile_complaints,
20633 _("debug info with no main source gives macro %s "
20635 is_define ? _("definition") : _("undefinition"),
20639 if ((line == 0 && !at_commandline)
20640 || (line != 0 && at_commandline))
20641 complaint (&symfile_complaints,
20642 _("debug info gives %s macro %s with %s line %d: %s"),
20643 at_commandline ? _("command-line") : _("in-file"),
20644 is_define ? _("definition") : _("undefinition"),
20645 line == 0 ? _("zero") : _("non-zero"), line, body);
20648 parse_macro_definition (current_file, line, body);
20651 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
20652 || macinfo_type == DW_MACRO_GNU_undef_indirect
20653 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
20654 macro_undef (current_file, line, body);
20659 case DW_MACRO_GNU_start_file:
20661 unsigned int bytes_read;
20664 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20665 mac_ptr += bytes_read;
20666 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20667 mac_ptr += bytes_read;
20669 if ((line == 0 && !at_commandline)
20670 || (line != 0 && at_commandline))
20671 complaint (&symfile_complaints,
20672 _("debug info gives source %d included "
20673 "from %s at %s line %d"),
20674 file, at_commandline ? _("command-line") : _("file"),
20675 line == 0 ? _("zero") : _("non-zero"), line);
20677 if (at_commandline)
20679 /* This DW_MACRO_GNU_start_file was executed in the
20681 at_commandline = 0;
20684 current_file = macro_start_file (file, line,
20685 current_file, comp_dir,
20690 case DW_MACRO_GNU_end_file:
20691 if (! current_file)
20692 complaint (&symfile_complaints,
20693 _("macro debug info has an unmatched "
20694 "`close_file' directive"));
20697 current_file = current_file->included_by;
20698 if (! current_file)
20700 enum dwarf_macro_record_type next_type;
20702 /* GCC circa March 2002 doesn't produce the zero
20703 type byte marking the end of the compilation
20704 unit. Complain if it's not there, but exit no
20707 /* Do we at least have room for a macinfo type byte? */
20708 if (mac_ptr >= mac_end)
20710 dwarf2_section_buffer_overflow_complaint (section);
20714 /* We don't increment mac_ptr here, so this is just
20716 next_type = read_1_byte (abfd, mac_ptr);
20717 if (next_type != 0)
20718 complaint (&symfile_complaints,
20719 _("no terminating 0-type entry for "
20720 "macros in `.debug_macinfo' section"));
20727 case DW_MACRO_GNU_transparent_include:
20728 case DW_MACRO_GNU_transparent_include_alt:
20732 bfd *include_bfd = abfd;
20733 struct dwarf2_section_info *include_section = section;
20734 struct dwarf2_section_info alt_section;
20735 const gdb_byte *include_mac_end = mac_end;
20736 int is_dwz = section_is_dwz;
20737 const gdb_byte *new_mac_ptr;
20739 offset = read_offset_1 (abfd, mac_ptr, offset_size);
20740 mac_ptr += offset_size;
20742 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
20744 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20746 dwarf2_read_section (dwarf2_per_objfile->objfile,
20749 include_section = &dwz->macro;
20750 include_bfd = get_section_bfd_owner (include_section);
20751 include_mac_end = dwz->macro.buffer + dwz->macro.size;
20755 new_mac_ptr = include_section->buffer + offset;
20756 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
20760 /* This has actually happened; see
20761 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
20762 complaint (&symfile_complaints,
20763 _("recursive DW_MACRO_GNU_transparent_include in "
20764 ".debug_macro section"));
20768 *slot = (void *) new_mac_ptr;
20770 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
20771 include_mac_end, current_file,
20773 section, section_is_gnu, is_dwz,
20774 offset_size, objfile, include_hash);
20776 htab_remove_elt (include_hash, (void *) new_mac_ptr);
20781 case DW_MACINFO_vendor_ext:
20782 if (!section_is_gnu)
20784 unsigned int bytes_read;
20787 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20788 mac_ptr += bytes_read;
20789 read_direct_string (abfd, mac_ptr, &bytes_read);
20790 mac_ptr += bytes_read;
20792 /* We don't recognize any vendor extensions. */
20798 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20799 mac_ptr, mac_end, abfd, offset_size,
20801 if (mac_ptr == NULL)
20805 } while (macinfo_type != 0);
20809 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
20810 const char *comp_dir, int section_is_gnu)
20812 struct objfile *objfile = dwarf2_per_objfile->objfile;
20813 struct line_header *lh = cu->line_header;
20815 const gdb_byte *mac_ptr, *mac_end;
20816 struct macro_source_file *current_file = 0;
20817 enum dwarf_macro_record_type macinfo_type;
20818 unsigned int offset_size = cu->header.offset_size;
20819 const gdb_byte *opcode_definitions[256];
20820 struct cleanup *cleanup;
20821 htab_t include_hash;
20823 struct dwarf2_section_info *section;
20824 const char *section_name;
20826 if (cu->dwo_unit != NULL)
20828 if (section_is_gnu)
20830 section = &cu->dwo_unit->dwo_file->sections.macro;
20831 section_name = ".debug_macro.dwo";
20835 section = &cu->dwo_unit->dwo_file->sections.macinfo;
20836 section_name = ".debug_macinfo.dwo";
20841 if (section_is_gnu)
20843 section = &dwarf2_per_objfile->macro;
20844 section_name = ".debug_macro";
20848 section = &dwarf2_per_objfile->macinfo;
20849 section_name = ".debug_macinfo";
20853 dwarf2_read_section (objfile, section);
20854 if (section->buffer == NULL)
20856 complaint (&symfile_complaints, _("missing %s section"), section_name);
20859 abfd = get_section_bfd_owner (section);
20861 /* First pass: Find the name of the base filename.
20862 This filename is needed in order to process all macros whose definition
20863 (or undefinition) comes from the command line. These macros are defined
20864 before the first DW_MACINFO_start_file entry, and yet still need to be
20865 associated to the base file.
20867 To determine the base file name, we scan the macro definitions until we
20868 reach the first DW_MACINFO_start_file entry. We then initialize
20869 CURRENT_FILE accordingly so that any macro definition found before the
20870 first DW_MACINFO_start_file can still be associated to the base file. */
20872 mac_ptr = section->buffer + offset;
20873 mac_end = section->buffer + section->size;
20875 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20876 &offset_size, section_is_gnu);
20877 if (mac_ptr == NULL)
20879 /* We already issued a complaint. */
20885 /* Do we at least have room for a macinfo type byte? */
20886 if (mac_ptr >= mac_end)
20888 /* Complaint is printed during the second pass as GDB will probably
20889 stop the first pass earlier upon finding
20890 DW_MACINFO_start_file. */
20894 macinfo_type = read_1_byte (abfd, mac_ptr);
20897 /* Note that we rely on the fact that the corresponding GNU and
20898 DWARF constants are the same. */
20899 switch (macinfo_type)
20901 /* A zero macinfo type indicates the end of the macro
20906 case DW_MACRO_GNU_define:
20907 case DW_MACRO_GNU_undef:
20908 /* Only skip the data by MAC_PTR. */
20910 unsigned int bytes_read;
20912 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20913 mac_ptr += bytes_read;
20914 read_direct_string (abfd, mac_ptr, &bytes_read);
20915 mac_ptr += bytes_read;
20919 case DW_MACRO_GNU_start_file:
20921 unsigned int bytes_read;
20924 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20925 mac_ptr += bytes_read;
20926 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20927 mac_ptr += bytes_read;
20929 current_file = macro_start_file (file, line, current_file,
20930 comp_dir, lh, objfile);
20934 case DW_MACRO_GNU_end_file:
20935 /* No data to skip by MAC_PTR. */
20938 case DW_MACRO_GNU_define_indirect:
20939 case DW_MACRO_GNU_undef_indirect:
20940 case DW_MACRO_GNU_define_indirect_alt:
20941 case DW_MACRO_GNU_undef_indirect_alt:
20943 unsigned int bytes_read;
20945 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20946 mac_ptr += bytes_read;
20947 mac_ptr += offset_size;
20951 case DW_MACRO_GNU_transparent_include:
20952 case DW_MACRO_GNU_transparent_include_alt:
20953 /* Note that, according to the spec, a transparent include
20954 chain cannot call DW_MACRO_GNU_start_file. So, we can just
20955 skip this opcode. */
20956 mac_ptr += offset_size;
20959 case DW_MACINFO_vendor_ext:
20960 /* Only skip the data by MAC_PTR. */
20961 if (!section_is_gnu)
20963 unsigned int bytes_read;
20965 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20966 mac_ptr += bytes_read;
20967 read_direct_string (abfd, mac_ptr, &bytes_read);
20968 mac_ptr += bytes_read;
20973 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20974 mac_ptr, mac_end, abfd, offset_size,
20976 if (mac_ptr == NULL)
20980 } while (macinfo_type != 0 && current_file == NULL);
20982 /* Second pass: Process all entries.
20984 Use the AT_COMMAND_LINE flag to determine whether we are still processing
20985 command-line macro definitions/undefinitions. This flag is unset when we
20986 reach the first DW_MACINFO_start_file entry. */
20988 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
20989 NULL, xcalloc, xfree);
20990 cleanup = make_cleanup_htab_delete (include_hash);
20991 mac_ptr = section->buffer + offset;
20992 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
20993 *slot = (void *) mac_ptr;
20994 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
20995 current_file, lh, comp_dir, section,
20997 offset_size, objfile, include_hash);
20998 do_cleanups (cleanup);
21001 /* Check if the attribute's form is a DW_FORM_block*
21002 if so return true else false. */
21005 attr_form_is_block (const struct attribute *attr)
21007 return (attr == NULL ? 0 :
21008 attr->form == DW_FORM_block1
21009 || attr->form == DW_FORM_block2
21010 || attr->form == DW_FORM_block4
21011 || attr->form == DW_FORM_block
21012 || attr->form == DW_FORM_exprloc);
21015 /* Return non-zero if ATTR's value is a section offset --- classes
21016 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
21017 You may use DW_UNSND (attr) to retrieve such offsets.
21019 Section 7.5.4, "Attribute Encodings", explains that no attribute
21020 may have a value that belongs to more than one of these classes; it
21021 would be ambiguous if we did, because we use the same forms for all
21025 attr_form_is_section_offset (const struct attribute *attr)
21027 return (attr->form == DW_FORM_data4
21028 || attr->form == DW_FORM_data8
21029 || attr->form == DW_FORM_sec_offset);
21032 /* Return non-zero if ATTR's value falls in the 'constant' class, or
21033 zero otherwise. When this function returns true, you can apply
21034 dwarf2_get_attr_constant_value to it.
21036 However, note that for some attributes you must check
21037 attr_form_is_section_offset before using this test. DW_FORM_data4
21038 and DW_FORM_data8 are members of both the constant class, and of
21039 the classes that contain offsets into other debug sections
21040 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
21041 that, if an attribute's can be either a constant or one of the
21042 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
21043 taken as section offsets, not constants. */
21046 attr_form_is_constant (const struct attribute *attr)
21048 switch (attr->form)
21050 case DW_FORM_sdata:
21051 case DW_FORM_udata:
21052 case DW_FORM_data1:
21053 case DW_FORM_data2:
21054 case DW_FORM_data4:
21055 case DW_FORM_data8:
21063 /* DW_ADDR is always stored already as sect_offset; despite for the forms
21064 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
21067 attr_form_is_ref (const struct attribute *attr)
21069 switch (attr->form)
21071 case DW_FORM_ref_addr:
21076 case DW_FORM_ref_udata:
21077 case DW_FORM_GNU_ref_alt:
21084 /* Return the .debug_loc section to use for CU.
21085 For DWO files use .debug_loc.dwo. */
21087 static struct dwarf2_section_info *
21088 cu_debug_loc_section (struct dwarf2_cu *cu)
21091 return &cu->dwo_unit->dwo_file->sections.loc;
21092 return &dwarf2_per_objfile->loc;
21095 /* A helper function that fills in a dwarf2_loclist_baton. */
21098 fill_in_loclist_baton (struct dwarf2_cu *cu,
21099 struct dwarf2_loclist_baton *baton,
21100 const struct attribute *attr)
21102 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21104 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
21106 baton->per_cu = cu->per_cu;
21107 gdb_assert (baton->per_cu);
21108 /* We don't know how long the location list is, but make sure we
21109 don't run off the edge of the section. */
21110 baton->size = section->size - DW_UNSND (attr);
21111 baton->data = section->buffer + DW_UNSND (attr);
21112 baton->base_address = cu->base_address;
21113 baton->from_dwo = cu->dwo_unit != NULL;
21117 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
21118 struct dwarf2_cu *cu, int is_block)
21120 struct objfile *objfile = dwarf2_per_objfile->objfile;
21121 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21123 if (attr_form_is_section_offset (attr)
21124 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
21125 the section. If so, fall through to the complaint in the
21127 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
21129 struct dwarf2_loclist_baton *baton;
21131 baton = obstack_alloc (&objfile->objfile_obstack,
21132 sizeof (struct dwarf2_loclist_baton));
21134 fill_in_loclist_baton (cu, baton, attr);
21136 if (cu->base_known == 0)
21137 complaint (&symfile_complaints,
21138 _("Location list used without "
21139 "specifying the CU base address."));
21141 SYMBOL_ACLASS_INDEX (sym) = (is_block
21142 ? dwarf2_loclist_block_index
21143 : dwarf2_loclist_index);
21144 SYMBOL_LOCATION_BATON (sym) = baton;
21148 struct dwarf2_locexpr_baton *baton;
21150 baton = obstack_alloc (&objfile->objfile_obstack,
21151 sizeof (struct dwarf2_locexpr_baton));
21152 baton->per_cu = cu->per_cu;
21153 gdb_assert (baton->per_cu);
21155 if (attr_form_is_block (attr))
21157 /* Note that we're just copying the block's data pointer
21158 here, not the actual data. We're still pointing into the
21159 info_buffer for SYM's objfile; right now we never release
21160 that buffer, but when we do clean up properly this may
21162 baton->size = DW_BLOCK (attr)->size;
21163 baton->data = DW_BLOCK (attr)->data;
21167 dwarf2_invalid_attrib_class_complaint ("location description",
21168 SYMBOL_NATURAL_NAME (sym));
21172 SYMBOL_ACLASS_INDEX (sym) = (is_block
21173 ? dwarf2_locexpr_block_index
21174 : dwarf2_locexpr_index);
21175 SYMBOL_LOCATION_BATON (sym) = baton;
21179 /* Return the OBJFILE associated with the compilation unit CU. If CU
21180 came from a separate debuginfo file, then the master objfile is
21184 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
21186 struct objfile *objfile = per_cu->objfile;
21188 /* Return the master objfile, so that we can report and look up the
21189 correct file containing this variable. */
21190 if (objfile->separate_debug_objfile_backlink)
21191 objfile = objfile->separate_debug_objfile_backlink;
21196 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
21197 (CU_HEADERP is unused in such case) or prepare a temporary copy at
21198 CU_HEADERP first. */
21200 static const struct comp_unit_head *
21201 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
21202 struct dwarf2_per_cu_data *per_cu)
21204 const gdb_byte *info_ptr;
21207 return &per_cu->cu->header;
21209 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
21211 memset (cu_headerp, 0, sizeof (*cu_headerp));
21212 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
21217 /* Return the address size given in the compilation unit header for CU. */
21220 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
21222 struct comp_unit_head cu_header_local;
21223 const struct comp_unit_head *cu_headerp;
21225 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21227 return cu_headerp->addr_size;
21230 /* Return the offset size given in the compilation unit header for CU. */
21233 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
21235 struct comp_unit_head cu_header_local;
21236 const struct comp_unit_head *cu_headerp;
21238 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21240 return cu_headerp->offset_size;
21243 /* See its dwarf2loc.h declaration. */
21246 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
21248 struct comp_unit_head cu_header_local;
21249 const struct comp_unit_head *cu_headerp;
21251 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21253 if (cu_headerp->version == 2)
21254 return cu_headerp->addr_size;
21256 return cu_headerp->offset_size;
21259 /* Return the text offset of the CU. The returned offset comes from
21260 this CU's objfile. If this objfile came from a separate debuginfo
21261 file, then the offset may be different from the corresponding
21262 offset in the parent objfile. */
21265 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
21267 struct objfile *objfile = per_cu->objfile;
21269 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21272 /* Locate the .debug_info compilation unit from CU's objfile which contains
21273 the DIE at OFFSET. Raises an error on failure. */
21275 static struct dwarf2_per_cu_data *
21276 dwarf2_find_containing_comp_unit (sect_offset offset,
21277 unsigned int offset_in_dwz,
21278 struct objfile *objfile)
21280 struct dwarf2_per_cu_data *this_cu;
21282 const sect_offset *cu_off;
21285 high = dwarf2_per_objfile->n_comp_units - 1;
21288 struct dwarf2_per_cu_data *mid_cu;
21289 int mid = low + (high - low) / 2;
21291 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
21292 cu_off = &mid_cu->offset;
21293 if (mid_cu->is_dwz > offset_in_dwz
21294 || (mid_cu->is_dwz == offset_in_dwz
21295 && cu_off->sect_off >= offset.sect_off))
21300 gdb_assert (low == high);
21301 this_cu = dwarf2_per_objfile->all_comp_units[low];
21302 cu_off = &this_cu->offset;
21303 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
21305 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
21306 error (_("Dwarf Error: could not find partial DIE containing "
21307 "offset 0x%lx [in module %s]"),
21308 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
21310 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
21311 <= offset.sect_off);
21312 return dwarf2_per_objfile->all_comp_units[low-1];
21316 this_cu = dwarf2_per_objfile->all_comp_units[low];
21317 if (low == dwarf2_per_objfile->n_comp_units - 1
21318 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
21319 error (_("invalid dwarf2 offset %u"), offset.sect_off);
21320 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
21325 /* Initialize dwarf2_cu CU, owned by PER_CU. */
21328 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
21330 memset (cu, 0, sizeof (*cu));
21332 cu->per_cu = per_cu;
21333 cu->objfile = per_cu->objfile;
21334 obstack_init (&cu->comp_unit_obstack);
21337 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
21340 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
21341 enum language pretend_language)
21343 struct attribute *attr;
21345 /* Set the language we're debugging. */
21346 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
21348 set_cu_language (DW_UNSND (attr), cu);
21351 cu->language = pretend_language;
21352 cu->language_defn = language_def (cu->language);
21355 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
21357 cu->producer = DW_STRING (attr);
21360 /* Release one cached compilation unit, CU. We unlink it from the tree
21361 of compilation units, but we don't remove it from the read_in_chain;
21362 the caller is responsible for that.
21363 NOTE: DATA is a void * because this function is also used as a
21364 cleanup routine. */
21367 free_heap_comp_unit (void *data)
21369 struct dwarf2_cu *cu = data;
21371 gdb_assert (cu->per_cu != NULL);
21372 cu->per_cu->cu = NULL;
21375 obstack_free (&cu->comp_unit_obstack, NULL);
21380 /* This cleanup function is passed the address of a dwarf2_cu on the stack
21381 when we're finished with it. We can't free the pointer itself, but be
21382 sure to unlink it from the cache. Also release any associated storage. */
21385 free_stack_comp_unit (void *data)
21387 struct dwarf2_cu *cu = data;
21389 gdb_assert (cu->per_cu != NULL);
21390 cu->per_cu->cu = NULL;
21393 obstack_free (&cu->comp_unit_obstack, NULL);
21394 cu->partial_dies = NULL;
21397 /* Free all cached compilation units. */
21400 free_cached_comp_units (void *data)
21402 struct dwarf2_per_cu_data *per_cu, **last_chain;
21404 per_cu = dwarf2_per_objfile->read_in_chain;
21405 last_chain = &dwarf2_per_objfile->read_in_chain;
21406 while (per_cu != NULL)
21408 struct dwarf2_per_cu_data *next_cu;
21410 next_cu = per_cu->cu->read_in_chain;
21412 free_heap_comp_unit (per_cu->cu);
21413 *last_chain = next_cu;
21419 /* Increase the age counter on each cached compilation unit, and free
21420 any that are too old. */
21423 age_cached_comp_units (void)
21425 struct dwarf2_per_cu_data *per_cu, **last_chain;
21427 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
21428 per_cu = dwarf2_per_objfile->read_in_chain;
21429 while (per_cu != NULL)
21431 per_cu->cu->last_used ++;
21432 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
21433 dwarf2_mark (per_cu->cu);
21434 per_cu = per_cu->cu->read_in_chain;
21437 per_cu = dwarf2_per_objfile->read_in_chain;
21438 last_chain = &dwarf2_per_objfile->read_in_chain;
21439 while (per_cu != NULL)
21441 struct dwarf2_per_cu_data *next_cu;
21443 next_cu = per_cu->cu->read_in_chain;
21445 if (!per_cu->cu->mark)
21447 free_heap_comp_unit (per_cu->cu);
21448 *last_chain = next_cu;
21451 last_chain = &per_cu->cu->read_in_chain;
21457 /* Remove a single compilation unit from the cache. */
21460 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
21462 struct dwarf2_per_cu_data *per_cu, **last_chain;
21464 per_cu = dwarf2_per_objfile->read_in_chain;
21465 last_chain = &dwarf2_per_objfile->read_in_chain;
21466 while (per_cu != NULL)
21468 struct dwarf2_per_cu_data *next_cu;
21470 next_cu = per_cu->cu->read_in_chain;
21472 if (per_cu == target_per_cu)
21474 free_heap_comp_unit (per_cu->cu);
21476 *last_chain = next_cu;
21480 last_chain = &per_cu->cu->read_in_chain;
21486 /* Release all extra memory associated with OBJFILE. */
21489 dwarf2_free_objfile (struct objfile *objfile)
21491 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21493 if (dwarf2_per_objfile == NULL)
21496 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
21497 free_cached_comp_units (NULL);
21499 if (dwarf2_per_objfile->quick_file_names_table)
21500 htab_delete (dwarf2_per_objfile->quick_file_names_table);
21502 /* Everything else should be on the objfile obstack. */
21505 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
21506 We store these in a hash table separate from the DIEs, and preserve them
21507 when the DIEs are flushed out of cache.
21509 The CU "per_cu" pointer is needed because offset alone is not enough to
21510 uniquely identify the type. A file may have multiple .debug_types sections,
21511 or the type may come from a DWO file. Furthermore, while it's more logical
21512 to use per_cu->section+offset, with Fission the section with the data is in
21513 the DWO file but we don't know that section at the point we need it.
21514 We have to use something in dwarf2_per_cu_data (or the pointer to it)
21515 because we can enter the lookup routine, get_die_type_at_offset, from
21516 outside this file, and thus won't necessarily have PER_CU->cu.
21517 Fortunately, PER_CU is stable for the life of the objfile. */
21519 struct dwarf2_per_cu_offset_and_type
21521 const struct dwarf2_per_cu_data *per_cu;
21522 sect_offset offset;
21526 /* Hash function for a dwarf2_per_cu_offset_and_type. */
21529 per_cu_offset_and_type_hash (const void *item)
21531 const struct dwarf2_per_cu_offset_and_type *ofs = item;
21533 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
21536 /* Equality function for a dwarf2_per_cu_offset_and_type. */
21539 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
21541 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
21542 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
21544 return (ofs_lhs->per_cu == ofs_rhs->per_cu
21545 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
21548 /* Set the type associated with DIE to TYPE. Save it in CU's hash
21549 table if necessary. For convenience, return TYPE.
21551 The DIEs reading must have careful ordering to:
21552 * Not cause infite loops trying to read in DIEs as a prerequisite for
21553 reading current DIE.
21554 * Not trying to dereference contents of still incompletely read in types
21555 while reading in other DIEs.
21556 * Enable referencing still incompletely read in types just by a pointer to
21557 the type without accessing its fields.
21559 Therefore caller should follow these rules:
21560 * Try to fetch any prerequisite types we may need to build this DIE type
21561 before building the type and calling set_die_type.
21562 * After building type call set_die_type for current DIE as soon as
21563 possible before fetching more types to complete the current type.
21564 * Make the type as complete as possible before fetching more types. */
21566 static struct type *
21567 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
21569 struct dwarf2_per_cu_offset_and_type **slot, ofs;
21570 struct objfile *objfile = cu->objfile;
21572 /* For Ada types, make sure that the gnat-specific data is always
21573 initialized (if not already set). There are a few types where
21574 we should not be doing so, because the type-specific area is
21575 already used to hold some other piece of info (eg: TYPE_CODE_FLT
21576 where the type-specific area is used to store the floatformat).
21577 But this is not a problem, because the gnat-specific information
21578 is actually not needed for these types. */
21579 if (need_gnat_info (cu)
21580 && TYPE_CODE (type) != TYPE_CODE_FUNC
21581 && TYPE_CODE (type) != TYPE_CODE_FLT
21582 && !HAVE_GNAT_AUX_INFO (type))
21583 INIT_GNAT_SPECIFIC (type);
21585 if (dwarf2_per_objfile->die_type_hash == NULL)
21587 dwarf2_per_objfile->die_type_hash =
21588 htab_create_alloc_ex (127,
21589 per_cu_offset_and_type_hash,
21590 per_cu_offset_and_type_eq,
21592 &objfile->objfile_obstack,
21593 hashtab_obstack_allocate,
21594 dummy_obstack_deallocate);
21597 ofs.per_cu = cu->per_cu;
21598 ofs.offset = die->offset;
21600 slot = (struct dwarf2_per_cu_offset_and_type **)
21601 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
21603 complaint (&symfile_complaints,
21604 _("A problem internal to GDB: DIE 0x%x has type already set"),
21605 die->offset.sect_off);
21606 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
21611 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
21612 or return NULL if the die does not have a saved type. */
21614 static struct type *
21615 get_die_type_at_offset (sect_offset offset,
21616 struct dwarf2_per_cu_data *per_cu)
21618 struct dwarf2_per_cu_offset_and_type *slot, ofs;
21620 if (dwarf2_per_objfile->die_type_hash == NULL)
21623 ofs.per_cu = per_cu;
21624 ofs.offset = offset;
21625 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
21632 /* Look up the type for DIE in CU in die_type_hash,
21633 or return NULL if DIE does not have a saved type. */
21635 static struct type *
21636 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
21638 return get_die_type_at_offset (die->offset, cu->per_cu);
21641 /* Add a dependence relationship from CU to REF_PER_CU. */
21644 dwarf2_add_dependence (struct dwarf2_cu *cu,
21645 struct dwarf2_per_cu_data *ref_per_cu)
21649 if (cu->dependencies == NULL)
21651 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
21652 NULL, &cu->comp_unit_obstack,
21653 hashtab_obstack_allocate,
21654 dummy_obstack_deallocate);
21656 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
21658 *slot = ref_per_cu;
21661 /* Subroutine of dwarf2_mark to pass to htab_traverse.
21662 Set the mark field in every compilation unit in the
21663 cache that we must keep because we are keeping CU. */
21666 dwarf2_mark_helper (void **slot, void *data)
21668 struct dwarf2_per_cu_data *per_cu;
21670 per_cu = (struct dwarf2_per_cu_data *) *slot;
21672 /* cu->dependencies references may not yet have been ever read if QUIT aborts
21673 reading of the chain. As such dependencies remain valid it is not much
21674 useful to track and undo them during QUIT cleanups. */
21675 if (per_cu->cu == NULL)
21678 if (per_cu->cu->mark)
21680 per_cu->cu->mark = 1;
21682 if (per_cu->cu->dependencies != NULL)
21683 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
21688 /* Set the mark field in CU and in every other compilation unit in the
21689 cache that we must keep because we are keeping CU. */
21692 dwarf2_mark (struct dwarf2_cu *cu)
21697 if (cu->dependencies != NULL)
21698 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
21702 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
21706 per_cu->cu->mark = 0;
21707 per_cu = per_cu->cu->read_in_chain;
21711 /* Trivial hash function for partial_die_info: the hash value of a DIE
21712 is its offset in .debug_info for this objfile. */
21715 partial_die_hash (const void *item)
21717 const struct partial_die_info *part_die = item;
21719 return part_die->offset.sect_off;
21722 /* Trivial comparison function for partial_die_info structures: two DIEs
21723 are equal if they have the same offset. */
21726 partial_die_eq (const void *item_lhs, const void *item_rhs)
21728 const struct partial_die_info *part_die_lhs = item_lhs;
21729 const struct partial_die_info *part_die_rhs = item_rhs;
21731 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
21734 static struct cmd_list_element *set_dwarf2_cmdlist;
21735 static struct cmd_list_element *show_dwarf2_cmdlist;
21738 set_dwarf2_cmd (char *args, int from_tty)
21740 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
21744 show_dwarf2_cmd (char *args, int from_tty)
21746 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
21749 /* Free data associated with OBJFILE, if necessary. */
21752 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
21754 struct dwarf2_per_objfile *data = d;
21757 /* Make sure we don't accidentally use dwarf2_per_objfile while
21759 dwarf2_per_objfile = NULL;
21761 for (ix = 0; ix < data->n_comp_units; ++ix)
21762 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
21764 for (ix = 0; ix < data->n_type_units; ++ix)
21765 VEC_free (dwarf2_per_cu_ptr,
21766 data->all_type_units[ix]->per_cu.imported_symtabs);
21767 xfree (data->all_type_units);
21769 VEC_free (dwarf2_section_info_def, data->types);
21771 if (data->dwo_files)
21772 free_dwo_files (data->dwo_files, objfile);
21773 if (data->dwp_file)
21774 gdb_bfd_unref (data->dwp_file->dbfd);
21776 if (data->dwz_file && data->dwz_file->dwz_bfd)
21777 gdb_bfd_unref (data->dwz_file->dwz_bfd);
21781 /* The "save gdb-index" command. */
21783 /* The contents of the hash table we create when building the string
21785 struct strtab_entry
21787 offset_type offset;
21791 /* Hash function for a strtab_entry.
21793 Function is used only during write_hash_table so no index format backward
21794 compatibility is needed. */
21797 hash_strtab_entry (const void *e)
21799 const struct strtab_entry *entry = e;
21800 return mapped_index_string_hash (INT_MAX, entry->str);
21803 /* Equality function for a strtab_entry. */
21806 eq_strtab_entry (const void *a, const void *b)
21808 const struct strtab_entry *ea = a;
21809 const struct strtab_entry *eb = b;
21810 return !strcmp (ea->str, eb->str);
21813 /* Create a strtab_entry hash table. */
21816 create_strtab (void)
21818 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
21819 xfree, xcalloc, xfree);
21822 /* Add a string to the constant pool. Return the string's offset in
21826 add_string (htab_t table, struct obstack *cpool, const char *str)
21829 struct strtab_entry entry;
21830 struct strtab_entry *result;
21833 slot = htab_find_slot (table, &entry, INSERT);
21838 result = XNEW (struct strtab_entry);
21839 result->offset = obstack_object_size (cpool);
21841 obstack_grow_str0 (cpool, str);
21844 return result->offset;
21847 /* An entry in the symbol table. */
21848 struct symtab_index_entry
21850 /* The name of the symbol. */
21852 /* The offset of the name in the constant pool. */
21853 offset_type index_offset;
21854 /* A sorted vector of the indices of all the CUs that hold an object
21856 VEC (offset_type) *cu_indices;
21859 /* The symbol table. This is a power-of-2-sized hash table. */
21860 struct mapped_symtab
21862 offset_type n_elements;
21864 struct symtab_index_entry **data;
21867 /* Hash function for a symtab_index_entry. */
21870 hash_symtab_entry (const void *e)
21872 const struct symtab_index_entry *entry = e;
21873 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
21874 sizeof (offset_type) * VEC_length (offset_type,
21875 entry->cu_indices),
21879 /* Equality function for a symtab_index_entry. */
21882 eq_symtab_entry (const void *a, const void *b)
21884 const struct symtab_index_entry *ea = a;
21885 const struct symtab_index_entry *eb = b;
21886 int len = VEC_length (offset_type, ea->cu_indices);
21887 if (len != VEC_length (offset_type, eb->cu_indices))
21889 return !memcmp (VEC_address (offset_type, ea->cu_indices),
21890 VEC_address (offset_type, eb->cu_indices),
21891 sizeof (offset_type) * len);
21894 /* Destroy a symtab_index_entry. */
21897 delete_symtab_entry (void *p)
21899 struct symtab_index_entry *entry = p;
21900 VEC_free (offset_type, entry->cu_indices);
21904 /* Create a hash table holding symtab_index_entry objects. */
21907 create_symbol_hash_table (void)
21909 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
21910 delete_symtab_entry, xcalloc, xfree);
21913 /* Create a new mapped symtab object. */
21915 static struct mapped_symtab *
21916 create_mapped_symtab (void)
21918 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
21919 symtab->n_elements = 0;
21920 symtab->size = 1024;
21921 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21925 /* Destroy a mapped_symtab. */
21928 cleanup_mapped_symtab (void *p)
21930 struct mapped_symtab *symtab = p;
21931 /* The contents of the array are freed when the other hash table is
21933 xfree (symtab->data);
21937 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
21940 Function is used only during write_hash_table so no index format backward
21941 compatibility is needed. */
21943 static struct symtab_index_entry **
21944 find_slot (struct mapped_symtab *symtab, const char *name)
21946 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
21948 index = hash & (symtab->size - 1);
21949 step = ((hash * 17) & (symtab->size - 1)) | 1;
21953 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
21954 return &symtab->data[index];
21955 index = (index + step) & (symtab->size - 1);
21959 /* Expand SYMTAB's hash table. */
21962 hash_expand (struct mapped_symtab *symtab)
21964 offset_type old_size = symtab->size;
21966 struct symtab_index_entry **old_entries = symtab->data;
21969 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21971 for (i = 0; i < old_size; ++i)
21973 if (old_entries[i])
21975 struct symtab_index_entry **slot = find_slot (symtab,
21976 old_entries[i]->name);
21977 *slot = old_entries[i];
21981 xfree (old_entries);
21984 /* Add an entry to SYMTAB. NAME is the name of the symbol.
21985 CU_INDEX is the index of the CU in which the symbol appears.
21986 IS_STATIC is one if the symbol is static, otherwise zero (global). */
21989 add_index_entry (struct mapped_symtab *symtab, const char *name,
21990 int is_static, gdb_index_symbol_kind kind,
21991 offset_type cu_index)
21993 struct symtab_index_entry **slot;
21994 offset_type cu_index_and_attrs;
21996 ++symtab->n_elements;
21997 if (4 * symtab->n_elements / 3 >= symtab->size)
21998 hash_expand (symtab);
22000 slot = find_slot (symtab, name);
22003 *slot = XNEW (struct symtab_index_entry);
22004 (*slot)->name = name;
22005 /* index_offset is set later. */
22006 (*slot)->cu_indices = NULL;
22009 cu_index_and_attrs = 0;
22010 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
22011 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
22012 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
22014 /* We don't want to record an index value twice as we want to avoid the
22016 We process all global symbols and then all static symbols
22017 (which would allow us to avoid the duplication by only having to check
22018 the last entry pushed), but a symbol could have multiple kinds in one CU.
22019 To keep things simple we don't worry about the duplication here and
22020 sort and uniqufy the list after we've processed all symbols. */
22021 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
22024 /* qsort helper routine for uniquify_cu_indices. */
22027 offset_type_compare (const void *ap, const void *bp)
22029 offset_type a = *(offset_type *) ap;
22030 offset_type b = *(offset_type *) bp;
22032 return (a > b) - (b > a);
22035 /* Sort and remove duplicates of all symbols' cu_indices lists. */
22038 uniquify_cu_indices (struct mapped_symtab *symtab)
22042 for (i = 0; i < symtab->size; ++i)
22044 struct symtab_index_entry *entry = symtab->data[i];
22047 && entry->cu_indices != NULL)
22049 unsigned int next_to_insert, next_to_check;
22050 offset_type last_value;
22052 qsort (VEC_address (offset_type, entry->cu_indices),
22053 VEC_length (offset_type, entry->cu_indices),
22054 sizeof (offset_type), offset_type_compare);
22056 last_value = VEC_index (offset_type, entry->cu_indices, 0);
22057 next_to_insert = 1;
22058 for (next_to_check = 1;
22059 next_to_check < VEC_length (offset_type, entry->cu_indices);
22062 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
22065 last_value = VEC_index (offset_type, entry->cu_indices,
22067 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
22072 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
22077 /* Add a vector of indices to the constant pool. */
22080 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
22081 struct symtab_index_entry *entry)
22085 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
22088 offset_type len = VEC_length (offset_type, entry->cu_indices);
22089 offset_type val = MAYBE_SWAP (len);
22094 entry->index_offset = obstack_object_size (cpool);
22096 obstack_grow (cpool, &val, sizeof (val));
22098 VEC_iterate (offset_type, entry->cu_indices, i, iter);
22101 val = MAYBE_SWAP (iter);
22102 obstack_grow (cpool, &val, sizeof (val));
22107 struct symtab_index_entry *old_entry = *slot;
22108 entry->index_offset = old_entry->index_offset;
22111 return entry->index_offset;
22114 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
22115 constant pool entries going into the obstack CPOOL. */
22118 write_hash_table (struct mapped_symtab *symtab,
22119 struct obstack *output, struct obstack *cpool)
22122 htab_t symbol_hash_table;
22125 symbol_hash_table = create_symbol_hash_table ();
22126 str_table = create_strtab ();
22128 /* We add all the index vectors to the constant pool first, to
22129 ensure alignment is ok. */
22130 for (i = 0; i < symtab->size; ++i)
22132 if (symtab->data[i])
22133 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
22136 /* Now write out the hash table. */
22137 for (i = 0; i < symtab->size; ++i)
22139 offset_type str_off, vec_off;
22141 if (symtab->data[i])
22143 str_off = add_string (str_table, cpool, symtab->data[i]->name);
22144 vec_off = symtab->data[i]->index_offset;
22148 /* While 0 is a valid constant pool index, it is not valid
22149 to have 0 for both offsets. */
22154 str_off = MAYBE_SWAP (str_off);
22155 vec_off = MAYBE_SWAP (vec_off);
22157 obstack_grow (output, &str_off, sizeof (str_off));
22158 obstack_grow (output, &vec_off, sizeof (vec_off));
22161 htab_delete (str_table);
22162 htab_delete (symbol_hash_table);
22165 /* Struct to map psymtab to CU index in the index file. */
22166 struct psymtab_cu_index_map
22168 struct partial_symtab *psymtab;
22169 unsigned int cu_index;
22173 hash_psymtab_cu_index (const void *item)
22175 const struct psymtab_cu_index_map *map = item;
22177 return htab_hash_pointer (map->psymtab);
22181 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
22183 const struct psymtab_cu_index_map *lhs = item_lhs;
22184 const struct psymtab_cu_index_map *rhs = item_rhs;
22186 return lhs->psymtab == rhs->psymtab;
22189 /* Helper struct for building the address table. */
22190 struct addrmap_index_data
22192 struct objfile *objfile;
22193 struct obstack *addr_obstack;
22194 htab_t cu_index_htab;
22196 /* Non-zero if the previous_* fields are valid.
22197 We can't write an entry until we see the next entry (since it is only then
22198 that we know the end of the entry). */
22199 int previous_valid;
22200 /* Index of the CU in the table of all CUs in the index file. */
22201 unsigned int previous_cu_index;
22202 /* Start address of the CU. */
22203 CORE_ADDR previous_cu_start;
22206 /* Write an address entry to OBSTACK. */
22209 add_address_entry (struct objfile *objfile, struct obstack *obstack,
22210 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
22212 offset_type cu_index_to_write;
22214 CORE_ADDR baseaddr;
22216 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22218 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
22219 obstack_grow (obstack, addr, 8);
22220 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
22221 obstack_grow (obstack, addr, 8);
22222 cu_index_to_write = MAYBE_SWAP (cu_index);
22223 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
22226 /* Worker function for traversing an addrmap to build the address table. */
22229 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
22231 struct addrmap_index_data *data = datap;
22232 struct partial_symtab *pst = obj;
22234 if (data->previous_valid)
22235 add_address_entry (data->objfile, data->addr_obstack,
22236 data->previous_cu_start, start_addr,
22237 data->previous_cu_index);
22239 data->previous_cu_start = start_addr;
22242 struct psymtab_cu_index_map find_map, *map;
22243 find_map.psymtab = pst;
22244 map = htab_find (data->cu_index_htab, &find_map);
22245 gdb_assert (map != NULL);
22246 data->previous_cu_index = map->cu_index;
22247 data->previous_valid = 1;
22250 data->previous_valid = 0;
22255 /* Write OBJFILE's address map to OBSTACK.
22256 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
22257 in the index file. */
22260 write_address_map (struct objfile *objfile, struct obstack *obstack,
22261 htab_t cu_index_htab)
22263 struct addrmap_index_data addrmap_index_data;
22265 /* When writing the address table, we have to cope with the fact that
22266 the addrmap iterator only provides the start of a region; we have to
22267 wait until the next invocation to get the start of the next region. */
22269 addrmap_index_data.objfile = objfile;
22270 addrmap_index_data.addr_obstack = obstack;
22271 addrmap_index_data.cu_index_htab = cu_index_htab;
22272 addrmap_index_data.previous_valid = 0;
22274 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
22275 &addrmap_index_data);
22277 /* It's highly unlikely the last entry (end address = 0xff...ff)
22278 is valid, but we should still handle it.
22279 The end address is recorded as the start of the next region, but that
22280 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
22282 if (addrmap_index_data.previous_valid)
22283 add_address_entry (objfile, obstack,
22284 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
22285 addrmap_index_data.previous_cu_index);
22288 /* Return the symbol kind of PSYM. */
22290 static gdb_index_symbol_kind
22291 symbol_kind (struct partial_symbol *psym)
22293 domain_enum domain = PSYMBOL_DOMAIN (psym);
22294 enum address_class aclass = PSYMBOL_CLASS (psym);
22302 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
22304 return GDB_INDEX_SYMBOL_KIND_TYPE;
22306 case LOC_CONST_BYTES:
22307 case LOC_OPTIMIZED_OUT:
22309 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22311 /* Note: It's currently impossible to recognize psyms as enum values
22312 short of reading the type info. For now punt. */
22313 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22315 /* There are other LOC_FOO values that one might want to classify
22316 as variables, but dwarf2read.c doesn't currently use them. */
22317 return GDB_INDEX_SYMBOL_KIND_OTHER;
22319 case STRUCT_DOMAIN:
22320 return GDB_INDEX_SYMBOL_KIND_TYPE;
22322 return GDB_INDEX_SYMBOL_KIND_OTHER;
22326 /* Add a list of partial symbols to SYMTAB. */
22329 write_psymbols (struct mapped_symtab *symtab,
22331 struct partial_symbol **psymp,
22333 offset_type cu_index,
22336 for (; count-- > 0; ++psymp)
22338 struct partial_symbol *psym = *psymp;
22341 if (SYMBOL_LANGUAGE (psym) == language_ada)
22342 error (_("Ada is not currently supported by the index"));
22344 /* Only add a given psymbol once. */
22345 slot = htab_find_slot (psyms_seen, psym, INSERT);
22348 gdb_index_symbol_kind kind = symbol_kind (psym);
22351 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
22352 is_static, kind, cu_index);
22357 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
22358 exception if there is an error. */
22361 write_obstack (FILE *file, struct obstack *obstack)
22363 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
22365 != obstack_object_size (obstack))
22366 error (_("couldn't data write to file"));
22369 /* Unlink a file if the argument is not NULL. */
22372 unlink_if_set (void *p)
22374 char **filename = p;
22376 unlink (*filename);
22379 /* A helper struct used when iterating over debug_types. */
22380 struct signatured_type_index_data
22382 struct objfile *objfile;
22383 struct mapped_symtab *symtab;
22384 struct obstack *types_list;
22389 /* A helper function that writes a single signatured_type to an
22393 write_one_signatured_type (void **slot, void *d)
22395 struct signatured_type_index_data *info = d;
22396 struct signatured_type *entry = (struct signatured_type *) *slot;
22397 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
22400 write_psymbols (info->symtab,
22402 info->objfile->global_psymbols.list
22403 + psymtab->globals_offset,
22404 psymtab->n_global_syms, info->cu_index,
22406 write_psymbols (info->symtab,
22408 info->objfile->static_psymbols.list
22409 + psymtab->statics_offset,
22410 psymtab->n_static_syms, info->cu_index,
22413 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22414 entry->per_cu.offset.sect_off);
22415 obstack_grow (info->types_list, val, 8);
22416 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22417 entry->type_offset_in_tu.cu_off);
22418 obstack_grow (info->types_list, val, 8);
22419 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
22420 obstack_grow (info->types_list, val, 8);
22427 /* Recurse into all "included" dependencies and write their symbols as
22428 if they appeared in this psymtab. */
22431 recursively_write_psymbols (struct objfile *objfile,
22432 struct partial_symtab *psymtab,
22433 struct mapped_symtab *symtab,
22435 offset_type cu_index)
22439 for (i = 0; i < psymtab->number_of_dependencies; ++i)
22440 if (psymtab->dependencies[i]->user != NULL)
22441 recursively_write_psymbols (objfile, psymtab->dependencies[i],
22442 symtab, psyms_seen, cu_index);
22444 write_psymbols (symtab,
22446 objfile->global_psymbols.list + psymtab->globals_offset,
22447 psymtab->n_global_syms, cu_index,
22449 write_psymbols (symtab,
22451 objfile->static_psymbols.list + psymtab->statics_offset,
22452 psymtab->n_static_syms, cu_index,
22456 /* Create an index file for OBJFILE in the directory DIR. */
22459 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
22461 struct cleanup *cleanup;
22462 char *filename, *cleanup_filename;
22463 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
22464 struct obstack cu_list, types_cu_list;
22467 struct mapped_symtab *symtab;
22468 offset_type val, size_of_contents, total_len;
22471 htab_t cu_index_htab;
22472 struct psymtab_cu_index_map *psymtab_cu_index_map;
22474 if (dwarf2_per_objfile->using_index)
22475 error (_("Cannot use an index to create the index"));
22477 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
22478 error (_("Cannot make an index when the file has multiple .debug_types sections"));
22480 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
22483 if (stat (objfile_name (objfile), &st) < 0)
22484 perror_with_name (objfile_name (objfile));
22486 filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)),
22487 INDEX_SUFFIX, (char *) NULL);
22488 cleanup = make_cleanup (xfree, filename);
22490 out_file = gdb_fopen_cloexec (filename, "wb");
22492 error (_("Can't open `%s' for writing"), filename);
22494 cleanup_filename = filename;
22495 make_cleanup (unlink_if_set, &cleanup_filename);
22497 symtab = create_mapped_symtab ();
22498 make_cleanup (cleanup_mapped_symtab, symtab);
22500 obstack_init (&addr_obstack);
22501 make_cleanup_obstack_free (&addr_obstack);
22503 obstack_init (&cu_list);
22504 make_cleanup_obstack_free (&cu_list);
22506 obstack_init (&types_cu_list);
22507 make_cleanup_obstack_free (&types_cu_list);
22509 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
22510 NULL, xcalloc, xfree);
22511 make_cleanup_htab_delete (psyms_seen);
22513 /* While we're scanning CU's create a table that maps a psymtab pointer
22514 (which is what addrmap records) to its index (which is what is recorded
22515 in the index file). This will later be needed to write the address
22517 cu_index_htab = htab_create_alloc (100,
22518 hash_psymtab_cu_index,
22519 eq_psymtab_cu_index,
22520 NULL, xcalloc, xfree);
22521 make_cleanup_htab_delete (cu_index_htab);
22522 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
22523 xmalloc (sizeof (struct psymtab_cu_index_map)
22524 * dwarf2_per_objfile->n_comp_units);
22525 make_cleanup (xfree, psymtab_cu_index_map);
22527 /* The CU list is already sorted, so we don't need to do additional
22528 work here. Also, the debug_types entries do not appear in
22529 all_comp_units, but only in their own hash table. */
22530 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
22532 struct dwarf2_per_cu_data *per_cu
22533 = dwarf2_per_objfile->all_comp_units[i];
22534 struct partial_symtab *psymtab = per_cu->v.psymtab;
22536 struct psymtab_cu_index_map *map;
22539 /* CU of a shared file from 'dwz -m' may be unused by this main file.
22540 It may be referenced from a local scope but in such case it does not
22541 need to be present in .gdb_index. */
22542 if (psymtab == NULL)
22545 if (psymtab->user == NULL)
22546 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
22548 map = &psymtab_cu_index_map[i];
22549 map->psymtab = psymtab;
22551 slot = htab_find_slot (cu_index_htab, map, INSERT);
22552 gdb_assert (slot != NULL);
22553 gdb_assert (*slot == NULL);
22556 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22557 per_cu->offset.sect_off);
22558 obstack_grow (&cu_list, val, 8);
22559 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
22560 obstack_grow (&cu_list, val, 8);
22563 /* Dump the address map. */
22564 write_address_map (objfile, &addr_obstack, cu_index_htab);
22566 /* Write out the .debug_type entries, if any. */
22567 if (dwarf2_per_objfile->signatured_types)
22569 struct signatured_type_index_data sig_data;
22571 sig_data.objfile = objfile;
22572 sig_data.symtab = symtab;
22573 sig_data.types_list = &types_cu_list;
22574 sig_data.psyms_seen = psyms_seen;
22575 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
22576 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
22577 write_one_signatured_type, &sig_data);
22580 /* Now that we've processed all symbols we can shrink their cu_indices
22582 uniquify_cu_indices (symtab);
22584 obstack_init (&constant_pool);
22585 make_cleanup_obstack_free (&constant_pool);
22586 obstack_init (&symtab_obstack);
22587 make_cleanup_obstack_free (&symtab_obstack);
22588 write_hash_table (symtab, &symtab_obstack, &constant_pool);
22590 obstack_init (&contents);
22591 make_cleanup_obstack_free (&contents);
22592 size_of_contents = 6 * sizeof (offset_type);
22593 total_len = size_of_contents;
22595 /* The version number. */
22596 val = MAYBE_SWAP (8);
22597 obstack_grow (&contents, &val, sizeof (val));
22599 /* The offset of the CU list from the start of the file. */
22600 val = MAYBE_SWAP (total_len);
22601 obstack_grow (&contents, &val, sizeof (val));
22602 total_len += obstack_object_size (&cu_list);
22604 /* The offset of the types CU list from the start of the file. */
22605 val = MAYBE_SWAP (total_len);
22606 obstack_grow (&contents, &val, sizeof (val));
22607 total_len += obstack_object_size (&types_cu_list);
22609 /* The offset of the address table from the start of the file. */
22610 val = MAYBE_SWAP (total_len);
22611 obstack_grow (&contents, &val, sizeof (val));
22612 total_len += obstack_object_size (&addr_obstack);
22614 /* The offset of the symbol table from the start of the file. */
22615 val = MAYBE_SWAP (total_len);
22616 obstack_grow (&contents, &val, sizeof (val));
22617 total_len += obstack_object_size (&symtab_obstack);
22619 /* The offset of the constant pool from the start of the file. */
22620 val = MAYBE_SWAP (total_len);
22621 obstack_grow (&contents, &val, sizeof (val));
22622 total_len += obstack_object_size (&constant_pool);
22624 gdb_assert (obstack_object_size (&contents) == size_of_contents);
22626 write_obstack (out_file, &contents);
22627 write_obstack (out_file, &cu_list);
22628 write_obstack (out_file, &types_cu_list);
22629 write_obstack (out_file, &addr_obstack);
22630 write_obstack (out_file, &symtab_obstack);
22631 write_obstack (out_file, &constant_pool);
22635 /* We want to keep the file, so we set cleanup_filename to NULL
22636 here. See unlink_if_set. */
22637 cleanup_filename = NULL;
22639 do_cleanups (cleanup);
22642 /* Implementation of the `save gdb-index' command.
22644 Note that the file format used by this command is documented in the
22645 GDB manual. Any changes here must be documented there. */
22648 save_gdb_index_command (char *arg, int from_tty)
22650 struct objfile *objfile;
22653 error (_("usage: save gdb-index DIRECTORY"));
22655 ALL_OBJFILES (objfile)
22659 /* If the objfile does not correspond to an actual file, skip it. */
22660 if (stat (objfile_name (objfile), &st) < 0)
22663 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
22664 if (dwarf2_per_objfile)
22666 volatile struct gdb_exception except;
22668 TRY_CATCH (except, RETURN_MASK_ERROR)
22670 write_psymtabs_to_index (objfile, arg);
22672 if (except.reason < 0)
22673 exception_fprintf (gdb_stderr, except,
22674 _("Error while writing index for `%s': "),
22675 objfile_name (objfile));
22682 int dwarf2_always_disassemble;
22685 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
22686 struct cmd_list_element *c, const char *value)
22688 fprintf_filtered (file,
22689 _("Whether to always disassemble "
22690 "DWARF expressions is %s.\n"),
22695 show_check_physname (struct ui_file *file, int from_tty,
22696 struct cmd_list_element *c, const char *value)
22698 fprintf_filtered (file,
22699 _("Whether to check \"physname\" is %s.\n"),
22703 void _initialize_dwarf2_read (void);
22706 _initialize_dwarf2_read (void)
22708 struct cmd_list_element *c;
22710 dwarf2_objfile_data_key
22711 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
22713 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
22714 Set DWARF 2 specific variables.\n\
22715 Configure DWARF 2 variables such as the cache size"),
22716 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
22717 0/*allow-unknown*/, &maintenance_set_cmdlist);
22719 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
22720 Show DWARF 2 specific variables\n\
22721 Show DWARF 2 variables such as the cache size"),
22722 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
22723 0/*allow-unknown*/, &maintenance_show_cmdlist);
22725 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
22726 &dwarf2_max_cache_age, _("\
22727 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
22728 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
22729 A higher limit means that cached compilation units will be stored\n\
22730 in memory longer, and more total memory will be used. Zero disables\n\
22731 caching, which can slow down startup."),
22733 show_dwarf2_max_cache_age,
22734 &set_dwarf2_cmdlist,
22735 &show_dwarf2_cmdlist);
22737 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
22738 &dwarf2_always_disassemble, _("\
22739 Set whether `info address' always disassembles DWARF expressions."), _("\
22740 Show whether `info address' always disassembles DWARF expressions."), _("\
22741 When enabled, DWARF expressions are always printed in an assembly-like\n\
22742 syntax. When disabled, expressions will be printed in a more\n\
22743 conversational style, when possible."),
22745 show_dwarf2_always_disassemble,
22746 &set_dwarf2_cmdlist,
22747 &show_dwarf2_cmdlist);
22749 add_setshow_zuinteger_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
22750 Set debugging of the dwarf2 reader."), _("\
22751 Show debugging of the dwarf2 reader."), _("\
22752 When enabled (non-zero), debugging messages are printed during dwarf2\n\
22753 reading and symtab expansion. A value of 1 (one) provides basic\n\
22754 information. A value greater than 1 provides more verbose information."),
22757 &setdebuglist, &showdebuglist);
22759 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
22760 Set debugging of the dwarf2 DIE reader."), _("\
22761 Show debugging of the dwarf2 DIE reader."), _("\
22762 When enabled (non-zero), DIEs are dumped after they are read in.\n\
22763 The value is the maximum depth to print."),
22766 &setdebuglist, &showdebuglist);
22768 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
22769 Set cross-checking of \"physname\" code against demangler."), _("\
22770 Show cross-checking of \"physname\" code against demangler."), _("\
22771 When enabled, GDB's internal \"physname\" code is checked against\n\
22773 NULL, show_check_physname,
22774 &setdebuglist, &showdebuglist);
22776 add_setshow_boolean_cmd ("use-deprecated-index-sections",
22777 no_class, &use_deprecated_index_sections, _("\
22778 Set whether to use deprecated gdb_index sections."), _("\
22779 Show whether to use deprecated gdb_index sections."), _("\
22780 When enabled, deprecated .gdb_index sections are used anyway.\n\
22781 Normally they are ignored either because of a missing feature or\n\
22782 performance issue.\n\
22783 Warning: This option must be enabled before gdb reads the file."),
22786 &setlist, &showlist);
22788 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
22790 Save a gdb-index file.\n\
22791 Usage: save gdb-index DIRECTORY"),
22793 set_cmd_completer (c, filename_completer);
22795 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
22796 &dwarf2_locexpr_funcs);
22797 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
22798 &dwarf2_loclist_funcs);
22800 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
22801 &dwarf2_block_frame_base_locexpr_funcs);
22802 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
22803 &dwarf2_block_frame_base_loclist_funcs);