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 /* Table of struct type_unit_group objects.
243 The hash key is the DW_AT_stmt_list value. */
244 htab_t type_unit_groups;
246 /* A table mapping .debug_types signatures to its signatured_type entry.
247 This is NULL if the .debug_types section hasn't been read in yet. */
248 htab_t signatured_types;
250 /* Type unit statistics, to see how well the scaling improvements
254 int nr_uniq_abbrev_tables;
256 int nr_symtab_sharers;
257 int nr_stmt_less_type_units;
260 /* A chain of compilation units that are currently read in, so that
261 they can be freed later. */
262 struct dwarf2_per_cu_data *read_in_chain;
264 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
265 This is NULL if the table hasn't been allocated yet. */
268 /* Non-zero if we've check for whether there is a DWP file. */
271 /* The DWP file if there is one, or NULL. */
272 struct dwp_file *dwp_file;
274 /* The shared '.dwz' file, if one exists. This is used when the
275 original data was compressed using 'dwz -m'. */
276 struct dwz_file *dwz_file;
278 /* A flag indicating wether this objfile has a section loaded at a
280 int has_section_at_zero;
282 /* True if we are using the mapped index,
283 or we are faking it for OBJF_READNOW's sake. */
284 unsigned char using_index;
286 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
287 struct mapped_index *index_table;
289 /* When using index_table, this keeps track of all quick_file_names entries.
290 TUs typically share line table entries with a CU, so we maintain a
291 separate table of all line table entries to support the sharing.
292 Note that while there can be way more TUs than CUs, we've already
293 sorted all the TUs into "type unit groups", grouped by their
294 DW_AT_stmt_list value. Therefore the only sharing done here is with a
295 CU and its associated TU group if there is one. */
296 htab_t quick_file_names_table;
298 /* Set during partial symbol reading, to prevent queueing of full
300 int reading_partial_symbols;
302 /* Table mapping type DIEs to their struct type *.
303 This is NULL if not allocated yet.
304 The mapping is done via (CU/TU + DIE offset) -> type. */
305 htab_t die_type_hash;
307 /* The CUs we recently read. */
308 VEC (dwarf2_per_cu_ptr) *just_read_cus;
311 static struct dwarf2_per_objfile *dwarf2_per_objfile;
313 /* Default names of the debugging sections. */
315 /* Note that if the debugging section has been compressed, it might
316 have a name like .zdebug_info. */
318 static const struct dwarf2_debug_sections dwarf2_elf_names =
320 { ".debug_info", ".zdebug_info" },
321 { ".debug_abbrev", ".zdebug_abbrev" },
322 { ".debug_line", ".zdebug_line" },
323 { ".debug_loc", ".zdebug_loc" },
324 { ".debug_macinfo", ".zdebug_macinfo" },
325 { ".debug_macro", ".zdebug_macro" },
326 { ".debug_str", ".zdebug_str" },
327 { ".debug_ranges", ".zdebug_ranges" },
328 { ".debug_types", ".zdebug_types" },
329 { ".debug_addr", ".zdebug_addr" },
330 { ".debug_frame", ".zdebug_frame" },
331 { ".eh_frame", NULL },
332 { ".gdb_index", ".zgdb_index" },
336 /* List of DWO/DWP sections. */
338 static const struct dwop_section_names
340 struct dwarf2_section_names abbrev_dwo;
341 struct dwarf2_section_names info_dwo;
342 struct dwarf2_section_names line_dwo;
343 struct dwarf2_section_names loc_dwo;
344 struct dwarf2_section_names macinfo_dwo;
345 struct dwarf2_section_names macro_dwo;
346 struct dwarf2_section_names str_dwo;
347 struct dwarf2_section_names str_offsets_dwo;
348 struct dwarf2_section_names types_dwo;
349 struct dwarf2_section_names cu_index;
350 struct dwarf2_section_names tu_index;
354 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
355 { ".debug_info.dwo", ".zdebug_info.dwo" },
356 { ".debug_line.dwo", ".zdebug_line.dwo" },
357 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
358 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
359 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
360 { ".debug_str.dwo", ".zdebug_str.dwo" },
361 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
362 { ".debug_types.dwo", ".zdebug_types.dwo" },
363 { ".debug_cu_index", ".zdebug_cu_index" },
364 { ".debug_tu_index", ".zdebug_tu_index" },
367 /* local data types */
369 /* The data in a compilation unit header, after target2host
370 translation, looks like this. */
371 struct comp_unit_head
375 unsigned char addr_size;
376 unsigned char signed_addr_p;
377 sect_offset abbrev_offset;
379 /* Size of file offsets; either 4 or 8. */
380 unsigned int offset_size;
382 /* Size of the length field; either 4 or 12. */
383 unsigned int initial_length_size;
385 /* Offset to the first byte of this compilation unit header in the
386 .debug_info section, for resolving relative reference dies. */
389 /* Offset to first die in this cu from the start of the cu.
390 This will be the first byte following the compilation unit header. */
391 cu_offset first_die_offset;
394 /* Type used for delaying computation of method physnames.
395 See comments for compute_delayed_physnames. */
396 struct delayed_method_info
398 /* The type to which the method is attached, i.e., its parent class. */
401 /* The index of the method in the type's function fieldlists. */
404 /* The index of the method in the fieldlist. */
407 /* The name of the DIE. */
410 /* The DIE associated with this method. */
411 struct die_info *die;
414 typedef struct delayed_method_info delayed_method_info;
415 DEF_VEC_O (delayed_method_info);
417 /* Internal state when decoding a particular compilation unit. */
420 /* The objfile containing this compilation unit. */
421 struct objfile *objfile;
423 /* The header of the compilation unit. */
424 struct comp_unit_head header;
426 /* Base address of this compilation unit. */
427 CORE_ADDR base_address;
429 /* Non-zero if base_address has been set. */
432 /* The language we are debugging. */
433 enum language language;
434 const struct language_defn *language_defn;
436 const char *producer;
438 /* The generic symbol table building routines have separate lists for
439 file scope symbols and all all other scopes (local scopes). So
440 we need to select the right one to pass to add_symbol_to_list().
441 We do it by keeping a pointer to the correct list in list_in_scope.
443 FIXME: The original dwarf code just treated the file scope as the
444 first local scope, and all other local scopes as nested local
445 scopes, and worked fine. Check to see if we really need to
446 distinguish these in buildsym.c. */
447 struct pending **list_in_scope;
449 /* The abbrev table for this CU.
450 Normally this points to the abbrev table in the objfile.
451 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
452 struct abbrev_table *abbrev_table;
454 /* Hash table holding all the loaded partial DIEs
455 with partial_die->offset.SECT_OFF as hash. */
458 /* Storage for things with the same lifetime as this read-in compilation
459 unit, including partial DIEs. */
460 struct obstack comp_unit_obstack;
462 /* When multiple dwarf2_cu structures are living in memory, this field
463 chains them all together, so that they can be released efficiently.
464 We will probably also want a generation counter so that most-recently-used
465 compilation units are cached... */
466 struct dwarf2_per_cu_data *read_in_chain;
468 /* Backlink to our per_cu entry. */
469 struct dwarf2_per_cu_data *per_cu;
471 /* How many compilation units ago was this CU last referenced? */
474 /* A hash table of DIE cu_offset for following references with
475 die_info->offset.sect_off as hash. */
478 /* Full DIEs if read in. */
479 struct die_info *dies;
481 /* A set of pointers to dwarf2_per_cu_data objects for compilation
482 units referenced by this one. Only set during full symbol processing;
483 partial symbol tables do not have dependencies. */
486 /* Header data from the line table, during full symbol processing. */
487 struct line_header *line_header;
489 /* A list of methods which need to have physnames computed
490 after all type information has been read. */
491 VEC (delayed_method_info) *method_list;
493 /* To be copied to symtab->call_site_htab. */
494 htab_t call_site_htab;
496 /* Non-NULL if this CU came from a DWO file.
497 There is an invariant here that is important to remember:
498 Except for attributes copied from the top level DIE in the "main"
499 (or "stub") file in preparation for reading the DWO file
500 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
501 Either there isn't a DWO file (in which case this is NULL and the point
502 is moot), or there is and either we're not going to read it (in which
503 case this is NULL) or there is and we are reading it (in which case this
505 struct dwo_unit *dwo_unit;
507 /* The DW_AT_addr_base attribute if present, zero otherwise
508 (zero is a valid value though).
509 Note this value comes from the Fission stub CU/TU's DIE. */
512 /* The DW_AT_ranges_base attribute if present, zero otherwise
513 (zero is a valid value though).
514 Note this value comes from the Fission stub CU/TU's DIE.
515 Also note that the value is zero in the non-DWO case so this value can
516 be used without needing to know whether DWO files are in use or not.
517 N.B. This does not apply to DW_AT_ranges appearing in
518 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
519 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
520 DW_AT_ranges_base *would* have to be applied, and we'd have to care
521 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
522 ULONGEST ranges_base;
524 /* Mark used when releasing cached dies. */
525 unsigned int mark : 1;
527 /* This CU references .debug_loc. See the symtab->locations_valid field.
528 This test is imperfect as there may exist optimized debug code not using
529 any location list and still facing inlining issues if handled as
530 unoptimized code. For a future better test see GCC PR other/32998. */
531 unsigned int has_loclist : 1;
533 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
534 if all the producer_is_* fields are valid. This information is cached
535 because profiling CU expansion showed excessive time spent in
536 producer_is_gxx_lt_4_6. */
537 unsigned int checked_producer : 1;
538 unsigned int producer_is_gxx_lt_4_6 : 1;
539 unsigned int producer_is_gcc_lt_4_3 : 1;
540 unsigned int producer_is_icc : 1;
542 /* When set, the file that we're processing is known to have
543 debugging info for C++ namespaces. GCC 3.3.x did not produce
544 this information, but later versions do. */
546 unsigned int processing_has_namespace_info : 1;
549 /* Persistent data held for a compilation unit, even when not
550 processing it. We put a pointer to this structure in the
551 read_symtab_private field of the psymtab. */
553 struct dwarf2_per_cu_data
555 /* The start offset and length of this compilation unit.
556 NOTE: Unlike comp_unit_head.length, this length includes
558 If the DIE refers to a DWO file, this is always of the original die,
563 /* Flag indicating this compilation unit will be read in before
564 any of the current compilation units are processed. */
565 unsigned int queued : 1;
567 /* This flag will be set when reading partial DIEs if we need to load
568 absolutely all DIEs for this compilation unit, instead of just the ones
569 we think are interesting. It gets set if we look for a DIE in the
570 hash table and don't find it. */
571 unsigned int load_all_dies : 1;
573 /* Non-zero if this CU is from .debug_types.
574 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
576 unsigned int is_debug_types : 1;
578 /* Non-zero if this CU is from the .dwz file. */
579 unsigned int is_dwz : 1;
581 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
582 This flag is only valid if is_debug_types is true.
583 We can't read a CU directly from a DWO file: There are required
584 attributes in the stub. */
585 unsigned int reading_dwo_directly : 1;
587 /* Non-zero if the TU has been read.
588 This is used to assist the "Stay in DWO Optimization" for Fission:
589 When reading a DWO, it's faster to read TUs from the DWO instead of
590 fetching them from random other DWOs (due to comdat folding).
591 If the TU has already been read, the optimization is unnecessary
592 (and unwise - we don't want to change where gdb thinks the TU lives
594 This flag is only valid if is_debug_types is true. */
595 unsigned int tu_read : 1;
597 /* The section this CU/TU lives in.
598 If the DIE refers to a DWO file, this is always the original die,
600 struct dwarf2_section_info *section;
602 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
603 of the CU cache it gets reset to NULL again. */
604 struct dwarf2_cu *cu;
606 /* The corresponding objfile.
607 Normally we can get the objfile from dwarf2_per_objfile.
608 However we can enter this file with just a "per_cu" handle. */
609 struct objfile *objfile;
611 /* When using partial symbol tables, the 'psymtab' field is active.
612 Otherwise the 'quick' field is active. */
615 /* The partial symbol table associated with this compilation unit,
616 or NULL for unread partial units. */
617 struct partial_symtab *psymtab;
619 /* Data needed by the "quick" functions. */
620 struct dwarf2_per_cu_quick_data *quick;
623 /* The CUs we import using DW_TAG_imported_unit. This is filled in
624 while reading psymtabs, used to compute the psymtab dependencies,
625 and then cleared. Then it is filled in again while reading full
626 symbols, and only deleted when the objfile is destroyed.
628 This is also used to work around a difference between the way gold
629 generates .gdb_index version <=7 and the way gdb does. Arguably this
630 is a gold bug. For symbols coming from TUs, gold records in the index
631 the CU that includes the TU instead of the TU itself. This breaks
632 dw2_lookup_symbol: It assumes that if the index says symbol X lives
633 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
634 will find X. Alas TUs live in their own symtab, so after expanding CU Y
635 we need to look in TU Z to find X. Fortunately, this is akin to
636 DW_TAG_imported_unit, so we just use the same mechanism: For
637 .gdb_index version <=7 this also records the TUs that the CU referred
638 to. Concurrently with this change gdb was modified to emit version 8
639 indices so we only pay a price for gold generated indices.
640 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
641 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
644 /* Entry in the signatured_types hash table. */
646 struct signatured_type
648 /* The "per_cu" object of this type.
649 This struct is used iff per_cu.is_debug_types.
650 N.B.: This is the first member so that it's easy to convert pointers
652 struct dwarf2_per_cu_data per_cu;
654 /* The type's signature. */
657 /* Offset in the TU of the type's DIE, as read from the TU header.
658 If this TU is a DWO stub and the definition lives in a DWO file
659 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
660 cu_offset type_offset_in_tu;
662 /* Offset in the section of the type's DIE.
663 If the definition lives in a DWO file, this is the offset in the
664 .debug_types.dwo section.
665 The value is zero until the actual value is known.
666 Zero is otherwise not a valid section offset. */
667 sect_offset type_offset_in_section;
669 /* Type units are grouped by their DW_AT_stmt_list entry so that they
670 can share them. This points to the containing symtab. */
671 struct type_unit_group *type_unit_group;
674 The first time we encounter this type we fully read it in and install it
675 in the symbol tables. Subsequent times we only need the type. */
678 /* Containing DWO unit.
679 This field is valid iff per_cu.reading_dwo_directly. */
680 struct dwo_unit *dwo_unit;
683 typedef struct signatured_type *sig_type_ptr;
684 DEF_VEC_P (sig_type_ptr);
686 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
687 This includes type_unit_group and quick_file_names. */
689 struct stmt_list_hash
691 /* The DWO unit this table is from or NULL if there is none. */
692 struct dwo_unit *dwo_unit;
694 /* Offset in .debug_line or .debug_line.dwo. */
695 sect_offset line_offset;
698 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
699 an object of this type. */
701 struct type_unit_group
703 /* dwarf2read.c's main "handle" on a TU symtab.
704 To simplify things we create an artificial CU that "includes" all the
705 type units using this stmt_list so that the rest of the code still has
706 a "per_cu" handle on the symtab.
707 This PER_CU is recognized by having no section. */
708 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
709 struct dwarf2_per_cu_data per_cu;
711 /* The TUs that share this DW_AT_stmt_list entry.
712 This is added to while parsing type units to build partial symtabs,
713 and is deleted afterwards and not used again. */
714 VEC (sig_type_ptr) *tus;
716 /* The primary symtab.
717 Type units in a group needn't all be defined in the same source file,
718 so we create an essentially anonymous symtab as the primary symtab. */
719 struct symtab *primary_symtab;
721 /* The data used to construct the hash key. */
722 struct stmt_list_hash hash;
724 /* The number of symtabs from the line header.
725 The value here must match line_header.num_file_names. */
726 unsigned int num_symtabs;
728 /* The symbol tables for this TU (obtained from the files listed in
730 WARNING: The order of entries here must match the order of entries
731 in the line header. After the first TU using this type_unit_group, the
732 line header for the subsequent TUs is recreated from this. This is done
733 because we need to use the same symtabs for each TU using the same
734 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
735 there's no guarantee the line header doesn't have duplicate entries. */
736 struct symtab **symtabs;
739 /* These sections are what may appear in a (real or virtual) DWO file. */
743 struct dwarf2_section_info abbrev;
744 struct dwarf2_section_info line;
745 struct dwarf2_section_info loc;
746 struct dwarf2_section_info macinfo;
747 struct dwarf2_section_info macro;
748 struct dwarf2_section_info str;
749 struct dwarf2_section_info str_offsets;
750 /* In the case of a virtual DWO file, these two are unused. */
751 struct dwarf2_section_info info;
752 VEC (dwarf2_section_info_def) *types;
755 /* CUs/TUs in DWP/DWO files. */
759 /* Backlink to the containing struct dwo_file. */
760 struct dwo_file *dwo_file;
762 /* The "id" that distinguishes this CU/TU.
763 .debug_info calls this "dwo_id", .debug_types calls this "signature".
764 Since signatures came first, we stick with it for consistency. */
767 /* The section this CU/TU lives in, in the DWO file. */
768 struct dwarf2_section_info *section;
770 /* Same as dwarf2_per_cu_data:{offset,length} but in the DWO section. */
774 /* For types, offset in the type's DIE of the type defined by this TU. */
775 cu_offset type_offset_in_tu;
778 /* include/dwarf2.h defines the DWP section codes.
779 It defines a max value but it doesn't define a min value, which we
780 use for error checking, so provide one. */
782 enum dwp_v2_section_ids
787 /* Data for one DWO file.
789 This includes virtual DWO files (a virtual DWO file is a DWO file as it
790 appears in a DWP file). DWP files don't really have DWO files per se -
791 comdat folding of types "loses" the DWO file they came from, and from
792 a high level view DWP files appear to contain a mass of random types.
793 However, to maintain consistency with the non-DWP case we pretend DWP
794 files contain virtual DWO files, and we assign each TU with one virtual
795 DWO file (generally based on the line and abbrev section offsets -
796 a heuristic that seems to work in practice). */
800 /* The DW_AT_GNU_dwo_name attribute.
801 For virtual DWO files the name is constructed from the section offsets
802 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
803 from related CU+TUs. */
804 const char *dwo_name;
806 /* The DW_AT_comp_dir attribute. */
807 const char *comp_dir;
809 /* The bfd, when the file is open. Otherwise this is NULL.
810 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
813 /* The sections that make up this DWO file.
814 Remember that for virtual DWO files in DWP V2, these are virtual
815 sections (for lack of a better name). */
816 struct dwo_sections sections;
818 /* The CU in the file.
819 We only support one because having more than one requires hacking the
820 dwo_name of each to match, which is highly unlikely to happen.
821 Doing this means all TUs can share comp_dir: We also assume that
822 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
825 /* Table of TUs in the file.
826 Each element is a struct dwo_unit. */
830 /* These sections are what may appear in a DWP file. */
834 /* These are used by both DWP version 1 and 2. */
835 struct dwarf2_section_info str;
836 struct dwarf2_section_info cu_index;
837 struct dwarf2_section_info tu_index;
839 /* These are only used by DWP version 2 files.
840 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
841 sections are referenced by section number, and are not recorded here.
842 In DWP version 2 there is at most one copy of all these sections, each
843 section being (effectively) comprised of the concatenation of all of the
844 individual sections that exist in the version 1 format.
845 To keep the code simple we treat each of these concatenated pieces as a
846 section itself (a virtual section?). */
847 struct dwarf2_section_info abbrev;
848 struct dwarf2_section_info info;
849 struct dwarf2_section_info line;
850 struct dwarf2_section_info loc;
851 struct dwarf2_section_info macinfo;
852 struct dwarf2_section_info macro;
853 struct dwarf2_section_info str_offsets;
854 struct dwarf2_section_info types;
857 /* These sections are what may appear in a virtual DWO file in DWP version 1.
858 A virtual DWO file is a DWO file as it appears in a DWP file. */
860 struct virtual_v1_dwo_sections
862 struct dwarf2_section_info abbrev;
863 struct dwarf2_section_info line;
864 struct dwarf2_section_info loc;
865 struct dwarf2_section_info macinfo;
866 struct dwarf2_section_info macro;
867 struct dwarf2_section_info str_offsets;
868 /* Each DWP hash table entry records one CU or one TU.
869 That is recorded here, and copied to dwo_unit.section. */
870 struct dwarf2_section_info info_or_types;
873 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
874 In version 2, the sections of the DWO files are concatenated together
875 and stored in one section of that name. Thus each ELF section contains
876 several "virtual" sections. */
878 struct virtual_v2_dwo_sections
880 bfd_size_type abbrev_offset;
881 bfd_size_type abbrev_size;
883 bfd_size_type line_offset;
884 bfd_size_type line_size;
886 bfd_size_type loc_offset;
887 bfd_size_type loc_size;
889 bfd_size_type macinfo_offset;
890 bfd_size_type macinfo_size;
892 bfd_size_type macro_offset;
893 bfd_size_type macro_size;
895 bfd_size_type str_offsets_offset;
896 bfd_size_type str_offsets_size;
898 /* Each DWP hash table entry records one CU or one TU.
899 That is recorded here, and copied to dwo_unit.section. */
900 bfd_size_type info_or_types_offset;
901 bfd_size_type info_or_types_size;
904 /* Contents of DWP hash tables. */
906 struct dwp_hash_table
908 uint32_t version, nr_columns;
909 uint32_t nr_units, nr_slots;
910 const gdb_byte *hash_table, *unit_table;
915 const gdb_byte *indices;
919 /* This is indexed by column number and gives the id of the section
921 #define MAX_NR_V2_DWO_SECTIONS \
922 (1 /* .debug_info or .debug_types */ \
923 + 1 /* .debug_abbrev */ \
924 + 1 /* .debug_line */ \
925 + 1 /* .debug_loc */ \
926 + 1 /* .debug_str_offsets */ \
927 + 1 /* .debug_macro or .debug_macinfo */)
928 int section_ids[MAX_NR_V2_DWO_SECTIONS];
929 const gdb_byte *offsets;
930 const gdb_byte *sizes;
935 /* Data for one DWP file. */
939 /* Name of the file. */
942 /* File format version. */
948 /* Section info for this file. */
949 struct dwp_sections sections;
951 /* Table of CUs in the file. */
952 const struct dwp_hash_table *cus;
954 /* Table of TUs in the file. */
955 const struct dwp_hash_table *tus;
957 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
961 /* Table to map ELF section numbers to their sections.
962 This is only needed for the DWP V1 file format. */
963 unsigned int num_sections;
964 asection **elf_sections;
967 /* This represents a '.dwz' file. */
971 /* A dwz file can only contain a few sections. */
972 struct dwarf2_section_info abbrev;
973 struct dwarf2_section_info info;
974 struct dwarf2_section_info str;
975 struct dwarf2_section_info line;
976 struct dwarf2_section_info macro;
977 struct dwarf2_section_info gdb_index;
983 /* Struct used to pass misc. parameters to read_die_and_children, et
984 al. which are used for both .debug_info and .debug_types dies.
985 All parameters here are unchanging for the life of the call. This
986 struct exists to abstract away the constant parameters of die reading. */
988 struct die_reader_specs
990 /* The bfd of die_section. */
993 /* The CU of the DIE we are parsing. */
994 struct dwarf2_cu *cu;
996 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
997 struct dwo_file *dwo_file;
999 /* The section the die comes from.
1000 This is either .debug_info or .debug_types, or the .dwo variants. */
1001 struct dwarf2_section_info *die_section;
1003 /* die_section->buffer. */
1004 const gdb_byte *buffer;
1006 /* The end of the buffer. */
1007 const gdb_byte *buffer_end;
1009 /* The value of the DW_AT_comp_dir attribute. */
1010 const char *comp_dir;
1013 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1014 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1015 const gdb_byte *info_ptr,
1016 struct die_info *comp_unit_die,
1020 /* The line number information for a compilation unit (found in the
1021 .debug_line section) begins with a "statement program header",
1022 which contains the following information. */
1025 unsigned int total_length;
1026 unsigned short version;
1027 unsigned int header_length;
1028 unsigned char minimum_instruction_length;
1029 unsigned char maximum_ops_per_instruction;
1030 unsigned char default_is_stmt;
1032 unsigned char line_range;
1033 unsigned char opcode_base;
1035 /* standard_opcode_lengths[i] is the number of operands for the
1036 standard opcode whose value is i. This means that
1037 standard_opcode_lengths[0] is unused, and the last meaningful
1038 element is standard_opcode_lengths[opcode_base - 1]. */
1039 unsigned char *standard_opcode_lengths;
1041 /* The include_directories table. NOTE! These strings are not
1042 allocated with xmalloc; instead, they are pointers into
1043 debug_line_buffer. If you try to free them, `free' will get
1045 unsigned int num_include_dirs, include_dirs_size;
1046 const char **include_dirs;
1048 /* The file_names table. NOTE! These strings are not allocated
1049 with xmalloc; instead, they are pointers into debug_line_buffer.
1050 Don't try to free them directly. */
1051 unsigned int num_file_names, file_names_size;
1055 unsigned int dir_index;
1056 unsigned int mod_time;
1057 unsigned int length;
1058 int included_p; /* Non-zero if referenced by the Line Number Program. */
1059 struct symtab *symtab; /* The associated symbol table, if any. */
1062 /* The start and end of the statement program following this
1063 header. These point into dwarf2_per_objfile->line_buffer. */
1064 const gdb_byte *statement_program_start, *statement_program_end;
1067 /* When we construct a partial symbol table entry we only
1068 need this much information. */
1069 struct partial_die_info
1071 /* Offset of this DIE. */
1074 /* DWARF-2 tag for this DIE. */
1075 ENUM_BITFIELD(dwarf_tag) tag : 16;
1077 /* Assorted flags describing the data found in this DIE. */
1078 unsigned int has_children : 1;
1079 unsigned int is_external : 1;
1080 unsigned int is_declaration : 1;
1081 unsigned int has_type : 1;
1082 unsigned int has_specification : 1;
1083 unsigned int has_pc_info : 1;
1084 unsigned int may_be_inlined : 1;
1086 /* Flag set if the SCOPE field of this structure has been
1088 unsigned int scope_set : 1;
1090 /* Flag set if the DIE has a byte_size attribute. */
1091 unsigned int has_byte_size : 1;
1093 /* Flag set if any of the DIE's children are template arguments. */
1094 unsigned int has_template_arguments : 1;
1096 /* Flag set if fixup_partial_die has been called on this die. */
1097 unsigned int fixup_called : 1;
1099 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1100 unsigned int is_dwz : 1;
1102 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1103 unsigned int spec_is_dwz : 1;
1105 /* The name of this DIE. Normally the value of DW_AT_name, but
1106 sometimes a default name for unnamed DIEs. */
1109 /* The linkage name, if present. */
1110 const char *linkage_name;
1112 /* The scope to prepend to our children. This is generally
1113 allocated on the comp_unit_obstack, so will disappear
1114 when this compilation unit leaves the cache. */
1117 /* Some data associated with the partial DIE. The tag determines
1118 which field is live. */
1121 /* The location description associated with this DIE, if any. */
1122 struct dwarf_block *locdesc;
1123 /* The offset of an import, for DW_TAG_imported_unit. */
1127 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1131 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1132 DW_AT_sibling, if any. */
1133 /* NOTE: This member isn't strictly necessary, read_partial_die could
1134 return DW_AT_sibling values to its caller load_partial_dies. */
1135 const gdb_byte *sibling;
1137 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1138 DW_AT_specification (or DW_AT_abstract_origin or
1139 DW_AT_extension). */
1140 sect_offset spec_offset;
1142 /* Pointers to this DIE's parent, first child, and next sibling,
1144 struct partial_die_info *die_parent, *die_child, *die_sibling;
1147 /* This data structure holds the information of an abbrev. */
1150 unsigned int number; /* number identifying abbrev */
1151 enum dwarf_tag tag; /* dwarf tag */
1152 unsigned short has_children; /* boolean */
1153 unsigned short num_attrs; /* number of attributes */
1154 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1155 struct abbrev_info *next; /* next in chain */
1160 ENUM_BITFIELD(dwarf_attribute) name : 16;
1161 ENUM_BITFIELD(dwarf_form) form : 16;
1164 /* Size of abbrev_table.abbrev_hash_table. */
1165 #define ABBREV_HASH_SIZE 121
1167 /* Top level data structure to contain an abbreviation table. */
1171 /* Where the abbrev table came from.
1172 This is used as a sanity check when the table is used. */
1175 /* Storage for the abbrev table. */
1176 struct obstack abbrev_obstack;
1178 /* Hash table of abbrevs.
1179 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1180 It could be statically allocated, but the previous code didn't so we
1182 struct abbrev_info **abbrevs;
1185 /* Attributes have a name and a value. */
1188 ENUM_BITFIELD(dwarf_attribute) name : 16;
1189 ENUM_BITFIELD(dwarf_form) form : 15;
1191 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1192 field should be in u.str (existing only for DW_STRING) but it is kept
1193 here for better struct attribute alignment. */
1194 unsigned int string_is_canonical : 1;
1199 struct dwarf_block *blk;
1208 /* This data structure holds a complete die structure. */
1211 /* DWARF-2 tag for this DIE. */
1212 ENUM_BITFIELD(dwarf_tag) tag : 16;
1214 /* Number of attributes */
1215 unsigned char num_attrs;
1217 /* True if we're presently building the full type name for the
1218 type derived from this DIE. */
1219 unsigned char building_fullname : 1;
1221 /* True if this die is in process. PR 16581. */
1222 unsigned char in_process : 1;
1225 unsigned int abbrev;
1227 /* Offset in .debug_info or .debug_types section. */
1230 /* The dies in a compilation unit form an n-ary tree. PARENT
1231 points to this die's parent; CHILD points to the first child of
1232 this node; and all the children of a given node are chained
1233 together via their SIBLING fields. */
1234 struct die_info *child; /* Its first child, if any. */
1235 struct die_info *sibling; /* Its next sibling, if any. */
1236 struct die_info *parent; /* Its parent, if any. */
1238 /* An array of attributes, with NUM_ATTRS elements. There may be
1239 zero, but it's not common and zero-sized arrays are not
1240 sufficiently portable C. */
1241 struct attribute attrs[1];
1244 /* Get at parts of an attribute structure. */
1246 #define DW_STRING(attr) ((attr)->u.str)
1247 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1248 #define DW_UNSND(attr) ((attr)->u.unsnd)
1249 #define DW_BLOCK(attr) ((attr)->u.blk)
1250 #define DW_SND(attr) ((attr)->u.snd)
1251 #define DW_ADDR(attr) ((attr)->u.addr)
1252 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1254 /* Blocks are a bunch of untyped bytes. */
1259 /* Valid only if SIZE is not zero. */
1260 const gdb_byte *data;
1263 #ifndef ATTR_ALLOC_CHUNK
1264 #define ATTR_ALLOC_CHUNK 4
1267 /* Allocate fields for structs, unions and enums in this size. */
1268 #ifndef DW_FIELD_ALLOC_CHUNK
1269 #define DW_FIELD_ALLOC_CHUNK 4
1272 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1273 but this would require a corresponding change in unpack_field_as_long
1275 static int bits_per_byte = 8;
1277 /* The routines that read and process dies for a C struct or C++ class
1278 pass lists of data member fields and lists of member function fields
1279 in an instance of a field_info structure, as defined below. */
1282 /* List of data member and baseclasses fields. */
1285 struct nextfield *next;
1290 *fields, *baseclasses;
1292 /* Number of fields (including baseclasses). */
1295 /* Number of baseclasses. */
1298 /* Set if the accesibility of one of the fields is not public. */
1299 int non_public_fields;
1301 /* Member function fields array, entries are allocated in the order they
1302 are encountered in the object file. */
1305 struct nextfnfield *next;
1306 struct fn_field fnfield;
1310 /* Member function fieldlist array, contains name of possibly overloaded
1311 member function, number of overloaded member functions and a pointer
1312 to the head of the member function field chain. */
1317 struct nextfnfield *head;
1321 /* Number of entries in the fnfieldlists array. */
1324 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1325 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1326 struct typedef_field_list
1328 struct typedef_field field;
1329 struct typedef_field_list *next;
1331 *typedef_field_list;
1332 unsigned typedef_field_list_count;
1335 /* One item on the queue of compilation units to read in full symbols
1337 struct dwarf2_queue_item
1339 struct dwarf2_per_cu_data *per_cu;
1340 enum language pretend_language;
1341 struct dwarf2_queue_item *next;
1344 /* The current queue. */
1345 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1347 /* Loaded secondary compilation units are kept in memory until they
1348 have not been referenced for the processing of this many
1349 compilation units. Set this to zero to disable caching. Cache
1350 sizes of up to at least twenty will improve startup time for
1351 typical inter-CU-reference binaries, at an obvious memory cost. */
1352 static int dwarf2_max_cache_age = 5;
1354 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1355 struct cmd_list_element *c, const char *value)
1357 fprintf_filtered (file, _("The upper bound on the age of cached "
1358 "dwarf2 compilation units is %s.\n"),
1362 /* local function prototypes */
1364 static const char *get_section_name (const struct dwarf2_section_info *);
1366 static const char *get_section_file_name (const struct dwarf2_section_info *);
1368 static void dwarf2_locate_sections (bfd *, asection *, void *);
1370 static void dwarf2_find_base_address (struct die_info *die,
1371 struct dwarf2_cu *cu);
1373 static struct partial_symtab *create_partial_symtab
1374 (struct dwarf2_per_cu_data *per_cu, const char *name);
1376 static void dwarf2_build_psymtabs_hard (struct objfile *);
1378 static void scan_partial_symbols (struct partial_die_info *,
1379 CORE_ADDR *, CORE_ADDR *,
1380 int, struct dwarf2_cu *);
1382 static void add_partial_symbol (struct partial_die_info *,
1383 struct dwarf2_cu *);
1385 static void add_partial_namespace (struct partial_die_info *pdi,
1386 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1387 int need_pc, struct dwarf2_cu *cu);
1389 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1390 CORE_ADDR *highpc, int need_pc,
1391 struct dwarf2_cu *cu);
1393 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1394 struct dwarf2_cu *cu);
1396 static void add_partial_subprogram (struct partial_die_info *pdi,
1397 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1398 int need_pc, struct dwarf2_cu *cu);
1400 static void dwarf2_read_symtab (struct partial_symtab *,
1403 static void psymtab_to_symtab_1 (struct partial_symtab *);
1405 static struct abbrev_info *abbrev_table_lookup_abbrev
1406 (const struct abbrev_table *, unsigned int);
1408 static struct abbrev_table *abbrev_table_read_table
1409 (struct dwarf2_section_info *, sect_offset);
1411 static void abbrev_table_free (struct abbrev_table *);
1413 static void abbrev_table_free_cleanup (void *);
1415 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1416 struct dwarf2_section_info *);
1418 static void dwarf2_free_abbrev_table (void *);
1420 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1422 static struct partial_die_info *load_partial_dies
1423 (const struct die_reader_specs *, const gdb_byte *, int);
1425 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1426 struct partial_die_info *,
1427 struct abbrev_info *,
1431 static struct partial_die_info *find_partial_die (sect_offset, int,
1432 struct dwarf2_cu *);
1434 static void fixup_partial_die (struct partial_die_info *,
1435 struct dwarf2_cu *);
1437 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1438 struct attribute *, struct attr_abbrev *,
1441 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1443 static int read_1_signed_byte (bfd *, const gdb_byte *);
1445 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1447 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1449 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1451 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1454 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1456 static LONGEST read_checked_initial_length_and_offset
1457 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1458 unsigned int *, unsigned int *);
1460 static LONGEST read_offset (bfd *, const gdb_byte *,
1461 const struct comp_unit_head *,
1464 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1466 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1469 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1471 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1473 static const char *read_indirect_string (bfd *, const gdb_byte *,
1474 const struct comp_unit_head *,
1477 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1479 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1481 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1483 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1487 static const char *read_str_index (const struct die_reader_specs *reader,
1488 ULONGEST str_index);
1490 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1492 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1493 struct dwarf2_cu *);
1495 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1498 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1499 struct dwarf2_cu *cu);
1501 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1503 static struct die_info *die_specification (struct die_info *die,
1504 struct dwarf2_cu **);
1506 static void free_line_header (struct line_header *lh);
1508 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1509 struct dwarf2_cu *cu);
1511 static void dwarf_decode_lines (struct line_header *, const char *,
1512 struct dwarf2_cu *, struct partial_symtab *,
1515 static void dwarf2_start_subfile (const char *, const char *, const char *);
1517 static void dwarf2_start_symtab (struct dwarf2_cu *,
1518 const char *, const char *, CORE_ADDR);
1520 static struct symbol *new_symbol (struct die_info *, struct type *,
1521 struct dwarf2_cu *);
1523 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1524 struct dwarf2_cu *, struct symbol *);
1526 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1527 struct dwarf2_cu *);
1529 static void dwarf2_const_value_attr (const struct attribute *attr,
1532 struct obstack *obstack,
1533 struct dwarf2_cu *cu, LONGEST *value,
1534 const gdb_byte **bytes,
1535 struct dwarf2_locexpr_baton **baton);
1537 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1539 static int need_gnat_info (struct dwarf2_cu *);
1541 static struct type *die_descriptive_type (struct die_info *,
1542 struct dwarf2_cu *);
1544 static void set_descriptive_type (struct type *, struct die_info *,
1545 struct dwarf2_cu *);
1547 static struct type *die_containing_type (struct die_info *,
1548 struct dwarf2_cu *);
1550 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1551 struct dwarf2_cu *);
1553 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1555 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1557 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1559 static char *typename_concat (struct obstack *obs, const char *prefix,
1560 const char *suffix, int physname,
1561 struct dwarf2_cu *cu);
1563 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1565 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1567 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1569 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1571 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1573 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1574 struct dwarf2_cu *, struct partial_symtab *);
1576 static int dwarf2_get_pc_bounds (struct die_info *,
1577 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1578 struct partial_symtab *);
1580 static void get_scope_pc_bounds (struct die_info *,
1581 CORE_ADDR *, CORE_ADDR *,
1582 struct dwarf2_cu *);
1584 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1585 CORE_ADDR, struct dwarf2_cu *);
1587 static void dwarf2_add_field (struct field_info *, struct die_info *,
1588 struct dwarf2_cu *);
1590 static void dwarf2_attach_fields_to_type (struct field_info *,
1591 struct type *, struct dwarf2_cu *);
1593 static void dwarf2_add_member_fn (struct field_info *,
1594 struct die_info *, struct type *,
1595 struct dwarf2_cu *);
1597 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1599 struct dwarf2_cu *);
1601 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1603 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1605 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1607 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1609 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1611 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1613 static struct type *read_module_type (struct die_info *die,
1614 struct dwarf2_cu *cu);
1616 static const char *namespace_name (struct die_info *die,
1617 int *is_anonymous, struct dwarf2_cu *);
1619 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1621 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1623 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1624 struct dwarf2_cu *);
1626 static struct die_info *read_die_and_siblings_1
1627 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1630 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1631 const gdb_byte *info_ptr,
1632 const gdb_byte **new_info_ptr,
1633 struct die_info *parent);
1635 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1636 struct die_info **, const gdb_byte *,
1639 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1640 struct die_info **, const gdb_byte *,
1643 static void process_die (struct die_info *, struct dwarf2_cu *);
1645 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1648 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1650 static const char *dwarf2_full_name (const char *name,
1651 struct die_info *die,
1652 struct dwarf2_cu *cu);
1654 static const char *dwarf2_physname (const char *name, struct die_info *die,
1655 struct dwarf2_cu *cu);
1657 static struct die_info *dwarf2_extension (struct die_info *die,
1658 struct dwarf2_cu **);
1660 static const char *dwarf_tag_name (unsigned int);
1662 static const char *dwarf_attr_name (unsigned int);
1664 static const char *dwarf_form_name (unsigned int);
1666 static char *dwarf_bool_name (unsigned int);
1668 static const char *dwarf_type_encoding_name (unsigned int);
1670 static struct die_info *sibling_die (struct die_info *);
1672 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1674 static void dump_die_for_error (struct die_info *);
1676 static void dump_die_1 (struct ui_file *, int level, int max_level,
1679 /*static*/ void dump_die (struct die_info *, int max_level);
1681 static void store_in_ref_table (struct die_info *,
1682 struct dwarf2_cu *);
1684 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1686 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1688 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1689 const struct attribute *,
1690 struct dwarf2_cu **);
1692 static struct die_info *follow_die_ref (struct die_info *,
1693 const struct attribute *,
1694 struct dwarf2_cu **);
1696 static struct die_info *follow_die_sig (struct die_info *,
1697 const struct attribute *,
1698 struct dwarf2_cu **);
1700 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1701 struct dwarf2_cu *);
1703 static struct type *get_DW_AT_signature_type (struct die_info *,
1704 const struct attribute *,
1705 struct dwarf2_cu *);
1707 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1709 static void read_signatured_type (struct signatured_type *);
1711 /* memory allocation interface */
1713 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1715 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1717 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1720 static int attr_form_is_block (const struct attribute *);
1722 static int attr_form_is_section_offset (const struct attribute *);
1724 static int attr_form_is_constant (const struct attribute *);
1726 static int attr_form_is_ref (const struct attribute *);
1728 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1729 struct dwarf2_loclist_baton *baton,
1730 const struct attribute *attr);
1732 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1734 struct dwarf2_cu *cu,
1737 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1738 const gdb_byte *info_ptr,
1739 struct abbrev_info *abbrev);
1741 static void free_stack_comp_unit (void *);
1743 static hashval_t partial_die_hash (const void *item);
1745 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1747 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1748 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1750 static void init_one_comp_unit (struct dwarf2_cu *cu,
1751 struct dwarf2_per_cu_data *per_cu);
1753 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1754 struct die_info *comp_unit_die,
1755 enum language pretend_language);
1757 static void free_heap_comp_unit (void *);
1759 static void free_cached_comp_units (void *);
1761 static void age_cached_comp_units (void);
1763 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1765 static struct type *set_die_type (struct die_info *, struct type *,
1766 struct dwarf2_cu *);
1768 static void create_all_comp_units (struct objfile *);
1770 static int create_all_type_units (struct objfile *);
1772 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1775 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1778 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1781 static void dwarf2_add_dependence (struct dwarf2_cu *,
1782 struct dwarf2_per_cu_data *);
1784 static void dwarf2_mark (struct dwarf2_cu *);
1786 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1788 static struct type *get_die_type_at_offset (sect_offset,
1789 struct dwarf2_per_cu_data *);
1791 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1793 static void dwarf2_release_queue (void *dummy);
1795 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1796 enum language pretend_language);
1798 static void process_queue (void);
1800 static void find_file_and_directory (struct die_info *die,
1801 struct dwarf2_cu *cu,
1802 const char **name, const char **comp_dir);
1804 static char *file_full_name (int file, struct line_header *lh,
1805 const char *comp_dir);
1807 static const gdb_byte *read_and_check_comp_unit_head
1808 (struct comp_unit_head *header,
1809 struct dwarf2_section_info *section,
1810 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1811 int is_debug_types_section);
1813 static void init_cutu_and_read_dies
1814 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1815 int use_existing_cu, int keep,
1816 die_reader_func_ftype *die_reader_func, void *data);
1818 static void init_cutu_and_read_dies_simple
1819 (struct dwarf2_per_cu_data *this_cu,
1820 die_reader_func_ftype *die_reader_func, void *data);
1822 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1824 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1826 static struct dwo_unit *lookup_dwo_unit_in_dwp
1827 (struct dwp_file *dwp_file, const char *comp_dir,
1828 ULONGEST signature, int is_debug_types);
1830 static struct dwp_file *get_dwp_file (void);
1832 static struct dwo_unit *lookup_dwo_comp_unit
1833 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1835 static struct dwo_unit *lookup_dwo_type_unit
1836 (struct signatured_type *, const char *, const char *);
1838 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1840 static void free_dwo_file_cleanup (void *);
1842 static void process_cu_includes (void);
1844 static void check_producer (struct dwarf2_cu *cu);
1846 /* Various complaints about symbol reading that don't abort the process. */
1849 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1851 complaint (&symfile_complaints,
1852 _("statement list doesn't fit in .debug_line section"));
1856 dwarf2_debug_line_missing_file_complaint (void)
1858 complaint (&symfile_complaints,
1859 _(".debug_line section has line data without a file"));
1863 dwarf2_debug_line_missing_end_sequence_complaint (void)
1865 complaint (&symfile_complaints,
1866 _(".debug_line section has line "
1867 "program sequence without an end"));
1871 dwarf2_complex_location_expr_complaint (void)
1873 complaint (&symfile_complaints, _("location expression too complex"));
1877 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1880 complaint (&symfile_complaints,
1881 _("const value length mismatch for '%s', got %d, expected %d"),
1886 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1888 complaint (&symfile_complaints,
1889 _("debug info runs off end of %s section"
1891 get_section_name (section),
1892 get_section_file_name (section));
1896 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1898 complaint (&symfile_complaints,
1899 _("macro debug info contains a "
1900 "malformed macro definition:\n`%s'"),
1905 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1907 complaint (&symfile_complaints,
1908 _("invalid attribute class or form for '%s' in '%s'"),
1914 /* Convert VALUE between big- and little-endian. */
1916 byte_swap (offset_type value)
1920 result = (value & 0xff) << 24;
1921 result |= (value & 0xff00) << 8;
1922 result |= (value & 0xff0000) >> 8;
1923 result |= (value & 0xff000000) >> 24;
1927 #define MAYBE_SWAP(V) byte_swap (V)
1930 #define MAYBE_SWAP(V) (V)
1931 #endif /* WORDS_BIGENDIAN */
1933 /* Read the given attribute value as an address, taking the attribute's
1934 form into account. */
1937 attr_value_as_address (struct attribute *attr)
1941 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
1943 /* Aside from a few clearly defined exceptions, attributes that
1944 contain an address must always be in DW_FORM_addr form.
1945 Unfortunately, some compilers happen to be violating this
1946 requirement by encoding addresses using other forms, such
1947 as DW_FORM_data4 for example. For those broken compilers,
1948 we try to do our best, without any guarantee of success,
1949 to interpret the address correctly. It would also be nice
1950 to generate a complaint, but that would require us to maintain
1951 a list of legitimate cases where a non-address form is allowed,
1952 as well as update callers to pass in at least the CU's DWARF
1953 version. This is more overhead than what we're willing to
1954 expand for a pretty rare case. */
1955 addr = DW_UNSND (attr);
1958 addr = DW_ADDR (attr);
1963 /* The suffix for an index file. */
1964 #define INDEX_SUFFIX ".gdb-index"
1966 /* Try to locate the sections we need for DWARF 2 debugging
1967 information and return true if we have enough to do something.
1968 NAMES points to the dwarf2 section names, or is NULL if the standard
1969 ELF names are used. */
1972 dwarf2_has_info (struct objfile *objfile,
1973 const struct dwarf2_debug_sections *names)
1975 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1976 if (!dwarf2_per_objfile)
1978 /* Initialize per-objfile state. */
1979 struct dwarf2_per_objfile *data
1980 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1982 memset (data, 0, sizeof (*data));
1983 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1984 dwarf2_per_objfile = data;
1986 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1988 dwarf2_per_objfile->objfile = objfile;
1990 return (!dwarf2_per_objfile->info.is_virtual
1991 && dwarf2_per_objfile->info.s.asection != NULL
1992 && !dwarf2_per_objfile->abbrev.is_virtual
1993 && dwarf2_per_objfile->abbrev.s.asection != NULL);
1996 /* Return the containing section of virtual section SECTION. */
1998 static struct dwarf2_section_info *
1999 get_containing_section (const struct dwarf2_section_info *section)
2001 gdb_assert (section->is_virtual);
2002 return section->s.containing_section;
2005 /* Return the bfd owner of SECTION. */
2008 get_section_bfd_owner (const struct dwarf2_section_info *section)
2010 if (section->is_virtual)
2012 section = get_containing_section (section);
2013 gdb_assert (!section->is_virtual);
2015 return section->s.asection->owner;
2018 /* Return the bfd section of SECTION.
2019 Returns NULL if the section is not present. */
2022 get_section_bfd_section (const struct dwarf2_section_info *section)
2024 if (section->is_virtual)
2026 section = get_containing_section (section);
2027 gdb_assert (!section->is_virtual);
2029 return section->s.asection;
2032 /* Return the name of SECTION. */
2035 get_section_name (const struct dwarf2_section_info *section)
2037 asection *sectp = get_section_bfd_section (section);
2039 gdb_assert (sectp != NULL);
2040 return bfd_section_name (get_section_bfd_owner (section), sectp);
2043 /* Return the name of the file SECTION is in. */
2046 get_section_file_name (const struct dwarf2_section_info *section)
2048 bfd *abfd = get_section_bfd_owner (section);
2050 return bfd_get_filename (abfd);
2053 /* Return the id of SECTION.
2054 Returns 0 if SECTION doesn't exist. */
2057 get_section_id (const struct dwarf2_section_info *section)
2059 asection *sectp = get_section_bfd_section (section);
2066 /* Return the flags of SECTION.
2067 SECTION (or containing section if this is a virtual section) must exist. */
2070 get_section_flags (const struct dwarf2_section_info *section)
2072 asection *sectp = get_section_bfd_section (section);
2074 gdb_assert (sectp != NULL);
2075 return bfd_get_section_flags (sectp->owner, sectp);
2078 /* When loading sections, we look either for uncompressed section or for
2079 compressed section names. */
2082 section_is_p (const char *section_name,
2083 const struct dwarf2_section_names *names)
2085 if (names->normal != NULL
2086 && strcmp (section_name, names->normal) == 0)
2088 if (names->compressed != NULL
2089 && strcmp (section_name, names->compressed) == 0)
2094 /* This function is mapped across the sections and remembers the
2095 offset and size of each of the debugging sections we are interested
2099 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
2101 const struct dwarf2_debug_sections *names;
2102 flagword aflag = bfd_get_section_flags (abfd, sectp);
2105 names = &dwarf2_elf_names;
2107 names = (const struct dwarf2_debug_sections *) vnames;
2109 if ((aflag & SEC_HAS_CONTENTS) == 0)
2112 else if (section_is_p (sectp->name, &names->info))
2114 dwarf2_per_objfile->info.s.asection = sectp;
2115 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
2117 else if (section_is_p (sectp->name, &names->abbrev))
2119 dwarf2_per_objfile->abbrev.s.asection = sectp;
2120 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
2122 else if (section_is_p (sectp->name, &names->line))
2124 dwarf2_per_objfile->line.s.asection = sectp;
2125 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
2127 else if (section_is_p (sectp->name, &names->loc))
2129 dwarf2_per_objfile->loc.s.asection = sectp;
2130 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
2132 else if (section_is_p (sectp->name, &names->macinfo))
2134 dwarf2_per_objfile->macinfo.s.asection = sectp;
2135 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
2137 else if (section_is_p (sectp->name, &names->macro))
2139 dwarf2_per_objfile->macro.s.asection = sectp;
2140 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
2142 else if (section_is_p (sectp->name, &names->str))
2144 dwarf2_per_objfile->str.s.asection = sectp;
2145 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
2147 else if (section_is_p (sectp->name, &names->addr))
2149 dwarf2_per_objfile->addr.s.asection = sectp;
2150 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
2152 else if (section_is_p (sectp->name, &names->frame))
2154 dwarf2_per_objfile->frame.s.asection = sectp;
2155 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
2157 else if (section_is_p (sectp->name, &names->eh_frame))
2159 dwarf2_per_objfile->eh_frame.s.asection = sectp;
2160 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
2162 else if (section_is_p (sectp->name, &names->ranges))
2164 dwarf2_per_objfile->ranges.s.asection = sectp;
2165 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
2167 else if (section_is_p (sectp->name, &names->types))
2169 struct dwarf2_section_info type_section;
2171 memset (&type_section, 0, sizeof (type_section));
2172 type_section.s.asection = sectp;
2173 type_section.size = bfd_get_section_size (sectp);
2175 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
2178 else if (section_is_p (sectp->name, &names->gdb_index))
2180 dwarf2_per_objfile->gdb_index.s.asection = sectp;
2181 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
2184 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
2185 && bfd_section_vma (abfd, sectp) == 0)
2186 dwarf2_per_objfile->has_section_at_zero = 1;
2189 /* A helper function that decides whether a section is empty,
2193 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2195 if (section->is_virtual)
2196 return section->size == 0;
2197 return section->s.asection == NULL || section->size == 0;
2200 /* Read the contents of the section INFO.
2201 OBJFILE is the main object file, but not necessarily the file where
2202 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2204 If the section is compressed, uncompress it before returning. */
2207 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2211 gdb_byte *buf, *retbuf;
2215 info->buffer = NULL;
2218 if (dwarf2_section_empty_p (info))
2221 sectp = get_section_bfd_section (info);
2223 /* If this is a virtual section we need to read in the real one first. */
2224 if (info->is_virtual)
2226 struct dwarf2_section_info *containing_section =
2227 get_containing_section (info);
2229 gdb_assert (sectp != NULL);
2230 if ((sectp->flags & SEC_RELOC) != 0)
2232 error (_("Dwarf Error: DWP format V2 with relocations is not"
2233 " supported in section %s [in module %s]"),
2234 get_section_name (info), get_section_file_name (info));
2236 dwarf2_read_section (objfile, containing_section);
2237 /* Other code should have already caught virtual sections that don't
2239 gdb_assert (info->virtual_offset + info->size
2240 <= containing_section->size);
2241 /* If the real section is empty or there was a problem reading the
2242 section we shouldn't get here. */
2243 gdb_assert (containing_section->buffer != NULL);
2244 info->buffer = containing_section->buffer + info->virtual_offset;
2248 /* If the section has relocations, we must read it ourselves.
2249 Otherwise we attach it to the BFD. */
2250 if ((sectp->flags & SEC_RELOC) == 0)
2252 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2256 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
2259 /* When debugging .o files, we may need to apply relocations; see
2260 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2261 We never compress sections in .o files, so we only need to
2262 try this when the section is not compressed. */
2263 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2266 info->buffer = retbuf;
2270 abfd = get_section_bfd_owner (info);
2271 gdb_assert (abfd != NULL);
2273 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2274 || bfd_bread (buf, info->size, abfd) != info->size)
2276 error (_("Dwarf Error: Can't read DWARF data"
2277 " in section %s [in module %s]"),
2278 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2282 /* A helper function that returns the size of a section in a safe way.
2283 If you are positive that the section has been read before using the
2284 size, then it is safe to refer to the dwarf2_section_info object's
2285 "size" field directly. In other cases, you must call this
2286 function, because for compressed sections the size field is not set
2287 correctly until the section has been read. */
2289 static bfd_size_type
2290 dwarf2_section_size (struct objfile *objfile,
2291 struct dwarf2_section_info *info)
2294 dwarf2_read_section (objfile, info);
2298 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2302 dwarf2_get_section_info (struct objfile *objfile,
2303 enum dwarf2_section_enum sect,
2304 asection **sectp, const gdb_byte **bufp,
2305 bfd_size_type *sizep)
2307 struct dwarf2_per_objfile *data
2308 = objfile_data (objfile, dwarf2_objfile_data_key);
2309 struct dwarf2_section_info *info;
2311 /* We may see an objfile without any DWARF, in which case we just
2322 case DWARF2_DEBUG_FRAME:
2323 info = &data->frame;
2325 case DWARF2_EH_FRAME:
2326 info = &data->eh_frame;
2329 gdb_assert_not_reached ("unexpected section");
2332 dwarf2_read_section (objfile, info);
2334 *sectp = get_section_bfd_section (info);
2335 *bufp = info->buffer;
2336 *sizep = info->size;
2339 /* A helper function to find the sections for a .dwz file. */
2342 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2344 struct dwz_file *dwz_file = arg;
2346 /* Note that we only support the standard ELF names, because .dwz
2347 is ELF-only (at the time of writing). */
2348 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2350 dwz_file->abbrev.s.asection = sectp;
2351 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2353 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2355 dwz_file->info.s.asection = sectp;
2356 dwz_file->info.size = bfd_get_section_size (sectp);
2358 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2360 dwz_file->str.s.asection = sectp;
2361 dwz_file->str.size = bfd_get_section_size (sectp);
2363 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2365 dwz_file->line.s.asection = sectp;
2366 dwz_file->line.size = bfd_get_section_size (sectp);
2368 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2370 dwz_file->macro.s.asection = sectp;
2371 dwz_file->macro.size = bfd_get_section_size (sectp);
2373 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2375 dwz_file->gdb_index.s.asection = sectp;
2376 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2380 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2381 there is no .gnu_debugaltlink section in the file. Error if there
2382 is such a section but the file cannot be found. */
2384 static struct dwz_file *
2385 dwarf2_get_dwz_file (void)
2389 struct cleanup *cleanup;
2390 const char *filename;
2391 struct dwz_file *result;
2392 bfd_size_type buildid_len_arg;
2396 if (dwarf2_per_objfile->dwz_file != NULL)
2397 return dwarf2_per_objfile->dwz_file;
2399 bfd_set_error (bfd_error_no_error);
2400 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2401 &buildid_len_arg, &buildid);
2404 if (bfd_get_error () == bfd_error_no_error)
2406 error (_("could not read '.gnu_debugaltlink' section: %s"),
2407 bfd_errmsg (bfd_get_error ()));
2409 cleanup = make_cleanup (xfree, data);
2410 make_cleanup (xfree, buildid);
2412 buildid_len = (size_t) buildid_len_arg;
2414 filename = (const char *) data;
2415 if (!IS_ABSOLUTE_PATH (filename))
2417 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2420 make_cleanup (xfree, abs);
2421 abs = ldirname (abs);
2422 make_cleanup (xfree, abs);
2424 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2425 make_cleanup (xfree, rel);
2429 /* First try the file name given in the section. If that doesn't
2430 work, try to use the build-id instead. */
2431 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2432 if (dwz_bfd != NULL)
2434 if (!build_id_verify (dwz_bfd, buildid_len, buildid))
2436 gdb_bfd_unref (dwz_bfd);
2441 if (dwz_bfd == NULL)
2442 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2444 if (dwz_bfd == NULL)
2445 error (_("could not find '.gnu_debugaltlink' file for %s"),
2446 objfile_name (dwarf2_per_objfile->objfile));
2448 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2450 result->dwz_bfd = dwz_bfd;
2452 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2454 do_cleanups (cleanup);
2456 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, dwz_bfd);
2457 dwarf2_per_objfile->dwz_file = result;
2461 /* DWARF quick_symbols_functions support. */
2463 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2464 unique line tables, so we maintain a separate table of all .debug_line
2465 derived entries to support the sharing.
2466 All the quick functions need is the list of file names. We discard the
2467 line_header when we're done and don't need to record it here. */
2468 struct quick_file_names
2470 /* The data used to construct the hash key. */
2471 struct stmt_list_hash hash;
2473 /* The number of entries in file_names, real_names. */
2474 unsigned int num_file_names;
2476 /* The file names from the line table, after being run through
2478 const char **file_names;
2480 /* The file names from the line table after being run through
2481 gdb_realpath. These are computed lazily. */
2482 const char **real_names;
2485 /* When using the index (and thus not using psymtabs), each CU has an
2486 object of this type. This is used to hold information needed by
2487 the various "quick" methods. */
2488 struct dwarf2_per_cu_quick_data
2490 /* The file table. This can be NULL if there was no file table
2491 or it's currently not read in.
2492 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2493 struct quick_file_names *file_names;
2495 /* The corresponding symbol table. This is NULL if symbols for this
2496 CU have not yet been read. */
2497 struct symtab *symtab;
2499 /* A temporary mark bit used when iterating over all CUs in
2500 expand_symtabs_matching. */
2501 unsigned int mark : 1;
2503 /* True if we've tried to read the file table and found there isn't one.
2504 There will be no point in trying to read it again next time. */
2505 unsigned int no_file_data : 1;
2508 /* Utility hash function for a stmt_list_hash. */
2511 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2515 if (stmt_list_hash->dwo_unit != NULL)
2516 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2517 v += stmt_list_hash->line_offset.sect_off;
2521 /* Utility equality function for a stmt_list_hash. */
2524 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2525 const struct stmt_list_hash *rhs)
2527 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2529 if (lhs->dwo_unit != NULL
2530 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2533 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2536 /* Hash function for a quick_file_names. */
2539 hash_file_name_entry (const void *e)
2541 const struct quick_file_names *file_data = e;
2543 return hash_stmt_list_entry (&file_data->hash);
2546 /* Equality function for a quick_file_names. */
2549 eq_file_name_entry (const void *a, const void *b)
2551 const struct quick_file_names *ea = a;
2552 const struct quick_file_names *eb = b;
2554 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2557 /* Delete function for a quick_file_names. */
2560 delete_file_name_entry (void *e)
2562 struct quick_file_names *file_data = e;
2565 for (i = 0; i < file_data->num_file_names; ++i)
2567 xfree ((void*) file_data->file_names[i]);
2568 if (file_data->real_names)
2569 xfree ((void*) file_data->real_names[i]);
2572 /* The space for the struct itself lives on objfile_obstack,
2573 so we don't free it here. */
2576 /* Create a quick_file_names hash table. */
2579 create_quick_file_names_table (unsigned int nr_initial_entries)
2581 return htab_create_alloc (nr_initial_entries,
2582 hash_file_name_entry, eq_file_name_entry,
2583 delete_file_name_entry, xcalloc, xfree);
2586 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2587 have to be created afterwards. You should call age_cached_comp_units after
2588 processing PER_CU->CU. dw2_setup must have been already called. */
2591 load_cu (struct dwarf2_per_cu_data *per_cu)
2593 if (per_cu->is_debug_types)
2594 load_full_type_unit (per_cu);
2596 load_full_comp_unit (per_cu, language_minimal);
2598 gdb_assert (per_cu->cu != NULL);
2600 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2603 /* Read in the symbols for PER_CU. */
2606 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2608 struct cleanup *back_to;
2610 /* Skip type_unit_groups, reading the type units they contain
2611 is handled elsewhere. */
2612 if (IS_TYPE_UNIT_GROUP (per_cu))
2615 back_to = make_cleanup (dwarf2_release_queue, NULL);
2617 if (dwarf2_per_objfile->using_index
2618 ? per_cu->v.quick->symtab == NULL
2619 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2621 queue_comp_unit (per_cu, language_minimal);
2624 /* If we just loaded a CU from a DWO, and we're working with an index
2625 that may badly handle TUs, load all the TUs in that DWO as well.
2626 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2627 if (!per_cu->is_debug_types
2628 && per_cu->cu->dwo_unit != NULL
2629 && dwarf2_per_objfile->index_table != NULL
2630 && dwarf2_per_objfile->index_table->version <= 7
2631 /* DWP files aren't supported yet. */
2632 && get_dwp_file () == NULL)
2633 queue_and_load_all_dwo_tus (per_cu);
2638 /* Age the cache, releasing compilation units that have not
2639 been used recently. */
2640 age_cached_comp_units ();
2642 do_cleanups (back_to);
2645 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2646 the objfile from which this CU came. Returns the resulting symbol
2649 static struct symtab *
2650 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2652 gdb_assert (dwarf2_per_objfile->using_index);
2653 if (!per_cu->v.quick->symtab)
2655 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2656 increment_reading_symtab ();
2657 dw2_do_instantiate_symtab (per_cu);
2658 process_cu_includes ();
2659 do_cleanups (back_to);
2661 return per_cu->v.quick->symtab;
2664 /* Return the CU/TU given its index.
2666 This is intended for loops like:
2668 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2669 + dwarf2_per_objfile->n_type_units); ++i)
2671 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2677 static struct dwarf2_per_cu_data *
2678 dw2_get_cutu (int index)
2680 if (index >= dwarf2_per_objfile->n_comp_units)
2682 index -= dwarf2_per_objfile->n_comp_units;
2683 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2684 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2687 return dwarf2_per_objfile->all_comp_units[index];
2690 /* Return the CU given its index.
2691 This differs from dw2_get_cutu in that it's for when you know INDEX
2694 static struct dwarf2_per_cu_data *
2695 dw2_get_cu (int index)
2697 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
2699 return dwarf2_per_objfile->all_comp_units[index];
2702 /* A helper for create_cus_from_index that handles a given list of
2706 create_cus_from_index_list (struct objfile *objfile,
2707 const gdb_byte *cu_list, offset_type n_elements,
2708 struct dwarf2_section_info *section,
2714 for (i = 0; i < n_elements; i += 2)
2716 struct dwarf2_per_cu_data *the_cu;
2717 ULONGEST offset, length;
2719 gdb_static_assert (sizeof (ULONGEST) >= 8);
2720 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2721 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2724 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2725 struct dwarf2_per_cu_data);
2726 the_cu->offset.sect_off = offset;
2727 the_cu->length = length;
2728 the_cu->objfile = objfile;
2729 the_cu->section = section;
2730 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2731 struct dwarf2_per_cu_quick_data);
2732 the_cu->is_dwz = is_dwz;
2733 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2737 /* Read the CU list from the mapped index, and use it to create all
2738 the CU objects for this objfile. */
2741 create_cus_from_index (struct objfile *objfile,
2742 const gdb_byte *cu_list, offset_type cu_list_elements,
2743 const gdb_byte *dwz_list, offset_type dwz_elements)
2745 struct dwz_file *dwz;
2747 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2748 dwarf2_per_objfile->all_comp_units
2749 = obstack_alloc (&objfile->objfile_obstack,
2750 dwarf2_per_objfile->n_comp_units
2751 * sizeof (struct dwarf2_per_cu_data *));
2753 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2754 &dwarf2_per_objfile->info, 0, 0);
2756 if (dwz_elements == 0)
2759 dwz = dwarf2_get_dwz_file ();
2760 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2761 cu_list_elements / 2);
2764 /* Create the signatured type hash table from the index. */
2767 create_signatured_type_table_from_index (struct objfile *objfile,
2768 struct dwarf2_section_info *section,
2769 const gdb_byte *bytes,
2770 offset_type elements)
2773 htab_t sig_types_hash;
2775 dwarf2_per_objfile->n_type_units = elements / 3;
2776 dwarf2_per_objfile->all_type_units
2777 = xmalloc (dwarf2_per_objfile->n_type_units
2778 * sizeof (struct signatured_type *));
2780 sig_types_hash = allocate_signatured_type_table (objfile);
2782 for (i = 0; i < elements; i += 3)
2784 struct signatured_type *sig_type;
2785 ULONGEST offset, type_offset_in_tu, signature;
2788 gdb_static_assert (sizeof (ULONGEST) >= 8);
2789 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2790 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2792 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2795 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2796 struct signatured_type);
2797 sig_type->signature = signature;
2798 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2799 sig_type->per_cu.is_debug_types = 1;
2800 sig_type->per_cu.section = section;
2801 sig_type->per_cu.offset.sect_off = offset;
2802 sig_type->per_cu.objfile = objfile;
2803 sig_type->per_cu.v.quick
2804 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2805 struct dwarf2_per_cu_quick_data);
2807 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2810 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2813 dwarf2_per_objfile->signatured_types = sig_types_hash;
2816 /* Read the address map data from the mapped index, and use it to
2817 populate the objfile's psymtabs_addrmap. */
2820 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2822 const gdb_byte *iter, *end;
2823 struct obstack temp_obstack;
2824 struct addrmap *mutable_map;
2825 struct cleanup *cleanup;
2828 obstack_init (&temp_obstack);
2829 cleanup = make_cleanup_obstack_free (&temp_obstack);
2830 mutable_map = addrmap_create_mutable (&temp_obstack);
2832 iter = index->address_table;
2833 end = iter + index->address_table_size;
2835 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2839 ULONGEST hi, lo, cu_index;
2840 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2842 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2844 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2849 complaint (&symfile_complaints,
2850 _(".gdb_index address table has invalid range (%s - %s)"),
2851 hex_string (lo), hex_string (hi));
2855 if (cu_index >= dwarf2_per_objfile->n_comp_units)
2857 complaint (&symfile_complaints,
2858 _(".gdb_index address table has invalid CU number %u"),
2859 (unsigned) cu_index);
2863 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2864 dw2_get_cutu (cu_index));
2867 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2868 &objfile->objfile_obstack);
2869 do_cleanups (cleanup);
2872 /* The hash function for strings in the mapped index. This is the same as
2873 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2874 implementation. This is necessary because the hash function is tied to the
2875 format of the mapped index file. The hash values do not have to match with
2878 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2881 mapped_index_string_hash (int index_version, const void *p)
2883 const unsigned char *str = (const unsigned char *) p;
2887 while ((c = *str++) != 0)
2889 if (index_version >= 5)
2891 r = r * 67 + c - 113;
2897 /* Find a slot in the mapped index INDEX for the object named NAME.
2898 If NAME is found, set *VEC_OUT to point to the CU vector in the
2899 constant pool and return 1. If NAME cannot be found, return 0. */
2902 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2903 offset_type **vec_out)
2905 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2907 offset_type slot, step;
2908 int (*cmp) (const char *, const char *);
2910 if (current_language->la_language == language_cplus
2911 || current_language->la_language == language_java
2912 || current_language->la_language == language_fortran)
2914 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2916 const char *paren = strchr (name, '(');
2922 dup = xmalloc (paren - name + 1);
2923 memcpy (dup, name, paren - name);
2924 dup[paren - name] = 0;
2926 make_cleanup (xfree, dup);
2931 /* Index version 4 did not support case insensitive searches. But the
2932 indices for case insensitive languages are built in lowercase, therefore
2933 simulate our NAME being searched is also lowercased. */
2934 hash = mapped_index_string_hash ((index->version == 4
2935 && case_sensitivity == case_sensitive_off
2936 ? 5 : index->version),
2939 slot = hash & (index->symbol_table_slots - 1);
2940 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2941 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2945 /* Convert a slot number to an offset into the table. */
2946 offset_type i = 2 * slot;
2948 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2950 do_cleanups (back_to);
2954 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2955 if (!cmp (name, str))
2957 *vec_out = (offset_type *) (index->constant_pool
2958 + MAYBE_SWAP (index->symbol_table[i + 1]));
2959 do_cleanups (back_to);
2963 slot = (slot + step) & (index->symbol_table_slots - 1);
2967 /* A helper function that reads the .gdb_index from SECTION and fills
2968 in MAP. FILENAME is the name of the file containing the section;
2969 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2970 ok to use deprecated sections.
2972 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2973 out parameters that are filled in with information about the CU and
2974 TU lists in the section.
2976 Returns 1 if all went well, 0 otherwise. */
2979 read_index_from_section (struct objfile *objfile,
2980 const char *filename,
2982 struct dwarf2_section_info *section,
2983 struct mapped_index *map,
2984 const gdb_byte **cu_list,
2985 offset_type *cu_list_elements,
2986 const gdb_byte **types_list,
2987 offset_type *types_list_elements)
2989 const gdb_byte *addr;
2990 offset_type version;
2991 offset_type *metadata;
2994 if (dwarf2_section_empty_p (section))
2997 /* Older elfutils strip versions could keep the section in the main
2998 executable while splitting it for the separate debug info file. */
2999 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3002 dwarf2_read_section (objfile, section);
3004 addr = section->buffer;
3005 /* Version check. */
3006 version = MAYBE_SWAP (*(offset_type *) addr);
3007 /* Versions earlier than 3 emitted every copy of a psymbol. This
3008 causes the index to behave very poorly for certain requests. Version 3
3009 contained incomplete addrmap. So, it seems better to just ignore such
3013 static int warning_printed = 0;
3014 if (!warning_printed)
3016 warning (_("Skipping obsolete .gdb_index section in %s."),
3018 warning_printed = 1;
3022 /* Index version 4 uses a different hash function than index version
3025 Versions earlier than 6 did not emit psymbols for inlined
3026 functions. Using these files will cause GDB not to be able to
3027 set breakpoints on inlined functions by name, so we ignore these
3028 indices unless the user has done
3029 "set use-deprecated-index-sections on". */
3030 if (version < 6 && !deprecated_ok)
3032 static int warning_printed = 0;
3033 if (!warning_printed)
3036 Skipping deprecated .gdb_index section in %s.\n\
3037 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3038 to use the section anyway."),
3040 warning_printed = 1;
3044 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3045 of the TU (for symbols coming from TUs),
3046 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3047 Plus gold-generated indices can have duplicate entries for global symbols,
3048 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3049 These are just performance bugs, and we can't distinguish gdb-generated
3050 indices from gold-generated ones, so issue no warning here. */
3052 /* Indexes with higher version than the one supported by GDB may be no
3053 longer backward compatible. */
3057 map->version = version;
3058 map->total_size = section->size;
3060 metadata = (offset_type *) (addr + sizeof (offset_type));
3063 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3064 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3068 *types_list = addr + MAYBE_SWAP (metadata[i]);
3069 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3070 - MAYBE_SWAP (metadata[i]))
3074 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3075 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3076 - MAYBE_SWAP (metadata[i]));
3079 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3080 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3081 - MAYBE_SWAP (metadata[i]))
3082 / (2 * sizeof (offset_type)));
3085 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3091 /* Read the index file. If everything went ok, initialize the "quick"
3092 elements of all the CUs and return 1. Otherwise, return 0. */
3095 dwarf2_read_index (struct objfile *objfile)
3097 struct mapped_index local_map, *map;
3098 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3099 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3100 struct dwz_file *dwz;
3102 if (!read_index_from_section (objfile, objfile_name (objfile),
3103 use_deprecated_index_sections,
3104 &dwarf2_per_objfile->gdb_index, &local_map,
3105 &cu_list, &cu_list_elements,
3106 &types_list, &types_list_elements))
3109 /* Don't use the index if it's empty. */
3110 if (local_map.symbol_table_slots == 0)
3113 /* If there is a .dwz file, read it so we can get its CU list as
3115 dwz = dwarf2_get_dwz_file ();
3118 struct mapped_index dwz_map;
3119 const gdb_byte *dwz_types_ignore;
3120 offset_type dwz_types_elements_ignore;
3122 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3124 &dwz->gdb_index, &dwz_map,
3125 &dwz_list, &dwz_list_elements,
3127 &dwz_types_elements_ignore))
3129 warning (_("could not read '.gdb_index' section from %s; skipping"),
3130 bfd_get_filename (dwz->dwz_bfd));
3135 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3138 if (types_list_elements)
3140 struct dwarf2_section_info *section;
3142 /* We can only handle a single .debug_types when we have an
3144 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3147 section = VEC_index (dwarf2_section_info_def,
3148 dwarf2_per_objfile->types, 0);
3150 create_signatured_type_table_from_index (objfile, section, types_list,
3151 types_list_elements);
3154 create_addrmap_from_index (objfile, &local_map);
3156 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
3159 dwarf2_per_objfile->index_table = map;
3160 dwarf2_per_objfile->using_index = 1;
3161 dwarf2_per_objfile->quick_file_names_table =
3162 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3167 /* A helper for the "quick" functions which sets the global
3168 dwarf2_per_objfile according to OBJFILE. */
3171 dw2_setup (struct objfile *objfile)
3173 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
3174 gdb_assert (dwarf2_per_objfile);
3177 /* die_reader_func for dw2_get_file_names. */
3180 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3181 const gdb_byte *info_ptr,
3182 struct die_info *comp_unit_die,
3186 struct dwarf2_cu *cu = reader->cu;
3187 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3188 struct objfile *objfile = dwarf2_per_objfile->objfile;
3189 struct dwarf2_per_cu_data *lh_cu;
3190 struct line_header *lh;
3191 struct attribute *attr;
3193 const char *name, *comp_dir;
3195 struct quick_file_names *qfn;
3196 unsigned int line_offset;
3198 gdb_assert (! this_cu->is_debug_types);
3200 /* Our callers never want to match partial units -- instead they
3201 will match the enclosing full CU. */
3202 if (comp_unit_die->tag == DW_TAG_partial_unit)
3204 this_cu->v.quick->no_file_data = 1;
3213 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3216 struct quick_file_names find_entry;
3218 line_offset = DW_UNSND (attr);
3220 /* We may have already read in this line header (TU line header sharing).
3221 If we have we're done. */
3222 find_entry.hash.dwo_unit = cu->dwo_unit;
3223 find_entry.hash.line_offset.sect_off = line_offset;
3224 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3225 &find_entry, INSERT);
3228 lh_cu->v.quick->file_names = *slot;
3232 lh = dwarf_decode_line_header (line_offset, cu);
3236 lh_cu->v.quick->no_file_data = 1;
3240 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
3241 qfn->hash.dwo_unit = cu->dwo_unit;
3242 qfn->hash.line_offset.sect_off = line_offset;
3243 gdb_assert (slot != NULL);
3246 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
3248 qfn->num_file_names = lh->num_file_names;
3249 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
3250 lh->num_file_names * sizeof (char *));
3251 for (i = 0; i < lh->num_file_names; ++i)
3252 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
3253 qfn->real_names = NULL;
3255 free_line_header (lh);
3257 lh_cu->v.quick->file_names = qfn;
3260 /* A helper for the "quick" functions which attempts to read the line
3261 table for THIS_CU. */
3263 static struct quick_file_names *
3264 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3266 /* This should never be called for TUs. */
3267 gdb_assert (! this_cu->is_debug_types);
3268 /* Nor type unit groups. */
3269 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3271 if (this_cu->v.quick->file_names != NULL)
3272 return this_cu->v.quick->file_names;
3273 /* If we know there is no line data, no point in looking again. */
3274 if (this_cu->v.quick->no_file_data)
3277 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3279 if (this_cu->v.quick->no_file_data)
3281 return this_cu->v.quick->file_names;
3284 /* A helper for the "quick" functions which computes and caches the
3285 real path for a given file name from the line table. */
3288 dw2_get_real_path (struct objfile *objfile,
3289 struct quick_file_names *qfn, int index)
3291 if (qfn->real_names == NULL)
3292 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3293 qfn->num_file_names, char *);
3295 if (qfn->real_names[index] == NULL)
3296 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3298 return qfn->real_names[index];
3301 static struct symtab *
3302 dw2_find_last_source_symtab (struct objfile *objfile)
3306 dw2_setup (objfile);
3307 index = dwarf2_per_objfile->n_comp_units - 1;
3308 return dw2_instantiate_symtab (dw2_get_cutu (index));
3311 /* Traversal function for dw2_forget_cached_source_info. */
3314 dw2_free_cached_file_names (void **slot, void *info)
3316 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3318 if (file_data->real_names)
3322 for (i = 0; i < file_data->num_file_names; ++i)
3324 xfree ((void*) file_data->real_names[i]);
3325 file_data->real_names[i] = NULL;
3333 dw2_forget_cached_source_info (struct objfile *objfile)
3335 dw2_setup (objfile);
3337 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3338 dw2_free_cached_file_names, NULL);
3341 /* Helper function for dw2_map_symtabs_matching_filename that expands
3342 the symtabs and calls the iterator. */
3345 dw2_map_expand_apply (struct objfile *objfile,
3346 struct dwarf2_per_cu_data *per_cu,
3347 const char *name, const char *real_path,
3348 int (*callback) (struct symtab *, void *),
3351 struct symtab *last_made = objfile->symtabs;
3353 /* Don't visit already-expanded CUs. */
3354 if (per_cu->v.quick->symtab)
3357 /* This may expand more than one symtab, and we want to iterate over
3359 dw2_instantiate_symtab (per_cu);
3361 return iterate_over_some_symtabs (name, real_path, callback, data,
3362 objfile->symtabs, last_made);
3365 /* Implementation of the map_symtabs_matching_filename method. */
3368 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3369 const char *real_path,
3370 int (*callback) (struct symtab *, void *),
3374 const char *name_basename = lbasename (name);
3376 dw2_setup (objfile);
3378 /* The rule is CUs specify all the files, including those used by
3379 any TU, so there's no need to scan TUs here. */
3381 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3384 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3385 struct quick_file_names *file_data;
3387 /* We only need to look at symtabs not already expanded. */
3388 if (per_cu->v.quick->symtab)
3391 file_data = dw2_get_file_names (per_cu);
3392 if (file_data == NULL)
3395 for (j = 0; j < file_data->num_file_names; ++j)
3397 const char *this_name = file_data->file_names[j];
3398 const char *this_real_name;
3400 if (compare_filenames_for_search (this_name, name))
3402 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3408 /* Before we invoke realpath, which can get expensive when many
3409 files are involved, do a quick comparison of the basenames. */
3410 if (! basenames_may_differ
3411 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3414 this_real_name = dw2_get_real_path (objfile, file_data, j);
3415 if (compare_filenames_for_search (this_real_name, name))
3417 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3423 if (real_path != NULL)
3425 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3426 gdb_assert (IS_ABSOLUTE_PATH (name));
3427 if (this_real_name != NULL
3428 && FILENAME_CMP (real_path, this_real_name) == 0)
3430 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3442 /* Struct used to manage iterating over all CUs looking for a symbol. */
3444 struct dw2_symtab_iterator
3446 /* The internalized form of .gdb_index. */
3447 struct mapped_index *index;
3448 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3449 int want_specific_block;
3450 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3451 Unused if !WANT_SPECIFIC_BLOCK. */
3453 /* The kind of symbol we're looking for. */
3455 /* The list of CUs from the index entry of the symbol,
3456 or NULL if not found. */
3458 /* The next element in VEC to look at. */
3460 /* The number of elements in VEC, or zero if there is no match. */
3462 /* Have we seen a global version of the symbol?
3463 If so we can ignore all further global instances.
3464 This is to work around gold/15646, inefficient gold-generated
3469 /* Initialize the index symtab iterator ITER.
3470 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3471 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3474 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3475 struct mapped_index *index,
3476 int want_specific_block,
3481 iter->index = index;
3482 iter->want_specific_block = want_specific_block;
3483 iter->block_index = block_index;
3484 iter->domain = domain;
3486 iter->global_seen = 0;
3488 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3489 iter->length = MAYBE_SWAP (*iter->vec);
3497 /* Return the next matching CU or NULL if there are no more. */
3499 static struct dwarf2_per_cu_data *
3500 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3502 for ( ; iter->next < iter->length; ++iter->next)
3504 offset_type cu_index_and_attrs =
3505 MAYBE_SWAP (iter->vec[iter->next + 1]);
3506 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3507 struct dwarf2_per_cu_data *per_cu;
3508 int want_static = iter->block_index != GLOBAL_BLOCK;
3509 /* This value is only valid for index versions >= 7. */
3510 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3511 gdb_index_symbol_kind symbol_kind =
3512 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3513 /* Only check the symbol attributes if they're present.
3514 Indices prior to version 7 don't record them,
3515 and indices >= 7 may elide them for certain symbols
3516 (gold does this). */
3518 (iter->index->version >= 7
3519 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3521 /* Don't crash on bad data. */
3522 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3523 + dwarf2_per_objfile->n_type_units))
3525 complaint (&symfile_complaints,
3526 _(".gdb_index entry has bad CU index"
3528 objfile_name (dwarf2_per_objfile->objfile));
3532 per_cu = dw2_get_cutu (cu_index);
3534 /* Skip if already read in. */
3535 if (per_cu->v.quick->symtab)
3538 /* Check static vs global. */
3541 if (iter->want_specific_block
3542 && want_static != is_static)
3544 /* Work around gold/15646. */
3545 if (!is_static && iter->global_seen)
3548 iter->global_seen = 1;
3551 /* Only check the symbol's kind if it has one. */
3554 switch (iter->domain)
3557 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3558 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3559 /* Some types are also in VAR_DOMAIN. */
3560 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3564 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3568 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3583 static struct symtab *
3584 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3585 const char *name, domain_enum domain)
3587 struct symtab *stab_best = NULL;
3588 struct mapped_index *index;
3590 dw2_setup (objfile);
3592 index = dwarf2_per_objfile->index_table;
3594 /* index is NULL if OBJF_READNOW. */
3597 struct dw2_symtab_iterator iter;
3598 struct dwarf2_per_cu_data *per_cu;
3600 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3602 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3604 struct symbol *sym = NULL;
3605 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3607 /* Some caution must be observed with overloaded functions
3608 and methods, since the index will not contain any overload
3609 information (but NAME might contain it). */
3612 struct blockvector *bv = BLOCKVECTOR (stab);
3613 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3615 sym = lookup_block_symbol (block, name, domain);
3618 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3620 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3626 /* Keep looking through other CUs. */
3634 dw2_print_stats (struct objfile *objfile)
3636 int i, total, count;
3638 dw2_setup (objfile);
3639 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3641 for (i = 0; i < total; ++i)
3643 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3645 if (!per_cu->v.quick->symtab)
3648 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3649 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3652 /* This dumps minimal information about the index.
3653 It is called via "mt print objfiles".
3654 One use is to verify .gdb_index has been loaded by the
3655 gdb.dwarf2/gdb-index.exp testcase. */
3658 dw2_dump (struct objfile *objfile)
3660 dw2_setup (objfile);
3661 gdb_assert (dwarf2_per_objfile->using_index);
3662 printf_filtered (".gdb_index:");
3663 if (dwarf2_per_objfile->index_table != NULL)
3665 printf_filtered (" version %d\n",
3666 dwarf2_per_objfile->index_table->version);
3669 printf_filtered (" faked for \"readnow\"\n");
3670 printf_filtered ("\n");
3674 dw2_relocate (struct objfile *objfile,
3675 const struct section_offsets *new_offsets,
3676 const struct section_offsets *delta)
3678 /* There's nothing to relocate here. */
3682 dw2_expand_symtabs_for_function (struct objfile *objfile,
3683 const char *func_name)
3685 struct mapped_index *index;
3687 dw2_setup (objfile);
3689 index = dwarf2_per_objfile->index_table;
3691 /* index is NULL if OBJF_READNOW. */
3694 struct dw2_symtab_iterator iter;
3695 struct dwarf2_per_cu_data *per_cu;
3697 /* Note: It doesn't matter what we pass for block_index here. */
3698 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3701 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3702 dw2_instantiate_symtab (per_cu);
3707 dw2_expand_all_symtabs (struct objfile *objfile)
3711 dw2_setup (objfile);
3713 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3714 + dwarf2_per_objfile->n_type_units); ++i)
3716 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3718 dw2_instantiate_symtab (per_cu);
3723 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3724 const char *fullname)
3728 dw2_setup (objfile);
3730 /* We don't need to consider type units here.
3731 This is only called for examining code, e.g. expand_line_sal.
3732 There can be an order of magnitude (or more) more type units
3733 than comp units, and we avoid them if we can. */
3735 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3738 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3739 struct quick_file_names *file_data;
3741 /* We only need to look at symtabs not already expanded. */
3742 if (per_cu->v.quick->symtab)
3745 file_data = dw2_get_file_names (per_cu);
3746 if (file_data == NULL)
3749 for (j = 0; j < file_data->num_file_names; ++j)
3751 const char *this_fullname = file_data->file_names[j];
3753 if (filename_cmp (this_fullname, fullname) == 0)
3755 dw2_instantiate_symtab (per_cu);
3763 dw2_map_matching_symbols (struct objfile *objfile,
3764 const char * name, domain_enum namespace,
3766 int (*callback) (struct block *,
3767 struct symbol *, void *),
3768 void *data, symbol_compare_ftype *match,
3769 symbol_compare_ftype *ordered_compare)
3771 /* Currently unimplemented; used for Ada. The function can be called if the
3772 current language is Ada for a non-Ada objfile using GNU index. As Ada
3773 does not look for non-Ada symbols this function should just return. */
3777 dw2_expand_symtabs_matching
3778 (struct objfile *objfile,
3779 expand_symtabs_file_matcher_ftype *file_matcher,
3780 expand_symtabs_symbol_matcher_ftype *symbol_matcher,
3781 enum search_domain kind,
3786 struct mapped_index *index;
3788 dw2_setup (objfile);
3790 /* index_table is NULL if OBJF_READNOW. */
3791 if (!dwarf2_per_objfile->index_table)
3793 index = dwarf2_per_objfile->index_table;
3795 if (file_matcher != NULL)
3797 struct cleanup *cleanup;
3798 htab_t visited_found, visited_not_found;
3800 visited_found = htab_create_alloc (10,
3801 htab_hash_pointer, htab_eq_pointer,
3802 NULL, xcalloc, xfree);
3803 cleanup = make_cleanup_htab_delete (visited_found);
3804 visited_not_found = htab_create_alloc (10,
3805 htab_hash_pointer, htab_eq_pointer,
3806 NULL, xcalloc, xfree);
3807 make_cleanup_htab_delete (visited_not_found);
3809 /* The rule is CUs specify all the files, including those used by
3810 any TU, so there's no need to scan TUs here. */
3812 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3815 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3816 struct quick_file_names *file_data;
3819 per_cu->v.quick->mark = 0;
3821 /* We only need to look at symtabs not already expanded. */
3822 if (per_cu->v.quick->symtab)
3825 file_data = dw2_get_file_names (per_cu);
3826 if (file_data == NULL)
3829 if (htab_find (visited_not_found, file_data) != NULL)
3831 else if (htab_find (visited_found, file_data) != NULL)
3833 per_cu->v.quick->mark = 1;
3837 for (j = 0; j < file_data->num_file_names; ++j)
3839 const char *this_real_name;
3841 if (file_matcher (file_data->file_names[j], data, 0))
3843 per_cu->v.quick->mark = 1;
3847 /* Before we invoke realpath, which can get expensive when many
3848 files are involved, do a quick comparison of the basenames. */
3849 if (!basenames_may_differ
3850 && !file_matcher (lbasename (file_data->file_names[j]),
3854 this_real_name = dw2_get_real_path (objfile, file_data, j);
3855 if (file_matcher (this_real_name, data, 0))
3857 per_cu->v.quick->mark = 1;
3862 slot = htab_find_slot (per_cu->v.quick->mark
3864 : visited_not_found,
3869 do_cleanups (cleanup);
3872 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3874 offset_type idx = 2 * iter;
3876 offset_type *vec, vec_len, vec_idx;
3877 int global_seen = 0;
3879 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3882 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3884 if (! (*symbol_matcher) (name, data))
3887 /* The name was matched, now expand corresponding CUs that were
3889 vec = (offset_type *) (index->constant_pool
3890 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3891 vec_len = MAYBE_SWAP (vec[0]);
3892 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3894 struct dwarf2_per_cu_data *per_cu;
3895 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3896 /* This value is only valid for index versions >= 7. */
3897 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3898 gdb_index_symbol_kind symbol_kind =
3899 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3900 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3901 /* Only check the symbol attributes if they're present.
3902 Indices prior to version 7 don't record them,
3903 and indices >= 7 may elide them for certain symbols
3904 (gold does this). */
3906 (index->version >= 7
3907 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3909 /* Work around gold/15646. */
3912 if (!is_static && global_seen)
3918 /* Only check the symbol's kind if it has one. */
3923 case VARIABLES_DOMAIN:
3924 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3927 case FUNCTIONS_DOMAIN:
3928 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3932 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3940 /* Don't crash on bad data. */
3941 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3942 + dwarf2_per_objfile->n_type_units))
3944 complaint (&symfile_complaints,
3945 _(".gdb_index entry has bad CU index"
3946 " [in module %s]"), objfile_name (objfile));
3950 per_cu = dw2_get_cutu (cu_index);
3951 if (file_matcher == NULL || per_cu->v.quick->mark)
3952 dw2_instantiate_symtab (per_cu);
3957 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3960 static struct symtab *
3961 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3965 if (BLOCKVECTOR (symtab) != NULL
3966 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3969 if (symtab->includes == NULL)
3972 for (i = 0; symtab->includes[i]; ++i)
3974 struct symtab *s = symtab->includes[i];
3976 s = recursively_find_pc_sect_symtab (s, pc);
3984 static struct symtab *
3985 dw2_find_pc_sect_symtab (struct objfile *objfile,
3986 struct bound_minimal_symbol msymbol,
3988 struct obj_section *section,
3991 struct dwarf2_per_cu_data *data;
3992 struct symtab *result;
3994 dw2_setup (objfile);
3996 if (!objfile->psymtabs_addrmap)
3999 data = addrmap_find (objfile->psymtabs_addrmap, pc);
4003 if (warn_if_readin && data->v.quick->symtab)
4004 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4005 paddress (get_objfile_arch (objfile), pc));
4007 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
4008 gdb_assert (result != NULL);
4013 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4014 void *data, int need_fullname)
4017 struct cleanup *cleanup;
4018 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
4019 NULL, xcalloc, xfree);
4021 cleanup = make_cleanup_htab_delete (visited);
4022 dw2_setup (objfile);
4024 /* The rule is CUs specify all the files, including those used by
4025 any TU, so there's no need to scan TUs here.
4026 We can ignore file names coming from already-expanded CUs. */
4028 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4030 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4032 if (per_cu->v.quick->symtab)
4034 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
4037 *slot = per_cu->v.quick->file_names;
4041 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4044 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4045 struct quick_file_names *file_data;
4048 /* We only need to look at symtabs not already expanded. */
4049 if (per_cu->v.quick->symtab)
4052 file_data = dw2_get_file_names (per_cu);
4053 if (file_data == NULL)
4056 slot = htab_find_slot (visited, file_data, INSERT);
4059 /* Already visited. */
4064 for (j = 0; j < file_data->num_file_names; ++j)
4066 const char *this_real_name;
4069 this_real_name = dw2_get_real_path (objfile, file_data, j);
4071 this_real_name = NULL;
4072 (*fun) (file_data->file_names[j], this_real_name, data);
4076 do_cleanups (cleanup);
4080 dw2_has_symbols (struct objfile *objfile)
4085 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4088 dw2_find_last_source_symtab,
4089 dw2_forget_cached_source_info,
4090 dw2_map_symtabs_matching_filename,
4095 dw2_expand_symtabs_for_function,
4096 dw2_expand_all_symtabs,
4097 dw2_expand_symtabs_with_fullname,
4098 dw2_map_matching_symbols,
4099 dw2_expand_symtabs_matching,
4100 dw2_find_pc_sect_symtab,
4101 dw2_map_symbol_filenames
4104 /* Initialize for reading DWARF for this objfile. Return 0 if this
4105 file will use psymtabs, or 1 if using the GNU index. */
4108 dwarf2_initialize_objfile (struct objfile *objfile)
4110 /* If we're about to read full symbols, don't bother with the
4111 indices. In this case we also don't care if some other debug
4112 format is making psymtabs, because they are all about to be
4114 if ((objfile->flags & OBJF_READNOW))
4118 dwarf2_per_objfile->using_index = 1;
4119 create_all_comp_units (objfile);
4120 create_all_type_units (objfile);
4121 dwarf2_per_objfile->quick_file_names_table =
4122 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4124 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4125 + dwarf2_per_objfile->n_type_units); ++i)
4127 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4129 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4130 struct dwarf2_per_cu_quick_data);
4133 /* Return 1 so that gdb sees the "quick" functions. However,
4134 these functions will be no-ops because we will have expanded
4139 if (dwarf2_read_index (objfile))
4147 /* Build a partial symbol table. */
4150 dwarf2_build_psymtabs (struct objfile *objfile)
4152 volatile struct gdb_exception except;
4154 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4156 init_psymbol_list (objfile, 1024);
4159 TRY_CATCH (except, RETURN_MASK_ERROR)
4161 /* This isn't really ideal: all the data we allocate on the
4162 objfile's obstack is still uselessly kept around. However,
4163 freeing it seems unsafe. */
4164 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
4166 dwarf2_build_psymtabs_hard (objfile);
4167 discard_cleanups (cleanups);
4169 if (except.reason < 0)
4170 exception_print (gdb_stderr, except);
4173 /* Return the total length of the CU described by HEADER. */
4176 get_cu_length (const struct comp_unit_head *header)
4178 return header->initial_length_size + header->length;
4181 /* Return TRUE if OFFSET is within CU_HEADER. */
4184 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
4186 sect_offset bottom = { cu_header->offset.sect_off };
4187 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
4189 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
4192 /* Find the base address of the compilation unit for range lists and
4193 location lists. It will normally be specified by DW_AT_low_pc.
4194 In DWARF-3 draft 4, the base address could be overridden by
4195 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4196 compilation units with discontinuous ranges. */
4199 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4201 struct attribute *attr;
4204 cu->base_address = 0;
4206 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4209 cu->base_address = attr_value_as_address (attr);
4214 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4217 cu->base_address = attr_value_as_address (attr);
4223 /* Read in the comp unit header information from the debug_info at info_ptr.
4224 NOTE: This leaves members offset, first_die_offset to be filled in
4227 static const gdb_byte *
4228 read_comp_unit_head (struct comp_unit_head *cu_header,
4229 const gdb_byte *info_ptr, bfd *abfd)
4232 unsigned int bytes_read;
4234 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4235 cu_header->initial_length_size = bytes_read;
4236 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4237 info_ptr += bytes_read;
4238 cu_header->version = read_2_bytes (abfd, info_ptr);
4240 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
4242 info_ptr += bytes_read;
4243 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4245 signed_addr = bfd_get_sign_extend_vma (abfd);
4246 if (signed_addr < 0)
4247 internal_error (__FILE__, __LINE__,
4248 _("read_comp_unit_head: dwarf from non elf file"));
4249 cu_header->signed_addr_p = signed_addr;
4254 /* Helper function that returns the proper abbrev section for
4257 static struct dwarf2_section_info *
4258 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4260 struct dwarf2_section_info *abbrev;
4262 if (this_cu->is_dwz)
4263 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4265 abbrev = &dwarf2_per_objfile->abbrev;
4270 /* Subroutine of read_and_check_comp_unit_head and
4271 read_and_check_type_unit_head to simplify them.
4272 Perform various error checking on the header. */
4275 error_check_comp_unit_head (struct comp_unit_head *header,
4276 struct dwarf2_section_info *section,
4277 struct dwarf2_section_info *abbrev_section)
4279 bfd *abfd = get_section_bfd_owner (section);
4280 const char *filename = get_section_file_name (section);
4282 if (header->version != 2 && header->version != 3 && header->version != 4)
4283 error (_("Dwarf Error: wrong version in compilation unit header "
4284 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
4287 if (header->abbrev_offset.sect_off
4288 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4289 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
4290 "(offset 0x%lx + 6) [in module %s]"),
4291 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
4294 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4295 avoid potential 32-bit overflow. */
4296 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4298 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4299 "(offset 0x%lx + 0) [in module %s]"),
4300 (long) header->length, (long) header->offset.sect_off,
4304 /* Read in a CU/TU header and perform some basic error checking.
4305 The contents of the header are stored in HEADER.
4306 The result is a pointer to the start of the first DIE. */
4308 static const gdb_byte *
4309 read_and_check_comp_unit_head (struct comp_unit_head *header,
4310 struct dwarf2_section_info *section,
4311 struct dwarf2_section_info *abbrev_section,
4312 const gdb_byte *info_ptr,
4313 int is_debug_types_section)
4315 const gdb_byte *beg_of_comp_unit = info_ptr;
4316 bfd *abfd = get_section_bfd_owner (section);
4318 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4320 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4322 /* If we're reading a type unit, skip over the signature and
4323 type_offset fields. */
4324 if (is_debug_types_section)
4325 info_ptr += 8 /*signature*/ + header->offset_size;
4327 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4329 error_check_comp_unit_head (header, section, abbrev_section);
4334 /* Read in the types comp unit header information from .debug_types entry at
4335 types_ptr. The result is a pointer to one past the end of the header. */
4337 static const gdb_byte *
4338 read_and_check_type_unit_head (struct comp_unit_head *header,
4339 struct dwarf2_section_info *section,
4340 struct dwarf2_section_info *abbrev_section,
4341 const gdb_byte *info_ptr,
4342 ULONGEST *signature,
4343 cu_offset *type_offset_in_tu)
4345 const gdb_byte *beg_of_comp_unit = info_ptr;
4346 bfd *abfd = get_section_bfd_owner (section);
4348 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4350 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4352 /* If we're reading a type unit, skip over the signature and
4353 type_offset fields. */
4354 if (signature != NULL)
4355 *signature = read_8_bytes (abfd, info_ptr);
4357 if (type_offset_in_tu != NULL)
4358 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4359 header->offset_size);
4360 info_ptr += header->offset_size;
4362 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4364 error_check_comp_unit_head (header, section, abbrev_section);
4369 /* Fetch the abbreviation table offset from a comp or type unit header. */
4372 read_abbrev_offset (struct dwarf2_section_info *section,
4375 bfd *abfd = get_section_bfd_owner (section);
4376 const gdb_byte *info_ptr;
4377 unsigned int length, initial_length_size, offset_size;
4378 sect_offset abbrev_offset;
4380 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4381 info_ptr = section->buffer + offset.sect_off;
4382 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4383 offset_size = initial_length_size == 4 ? 4 : 8;
4384 info_ptr += initial_length_size + 2 /*version*/;
4385 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4386 return abbrev_offset;
4389 /* Allocate a new partial symtab for file named NAME and mark this new
4390 partial symtab as being an include of PST. */
4393 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4394 struct objfile *objfile)
4396 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4398 if (!IS_ABSOLUTE_PATH (subpst->filename))
4400 /* It shares objfile->objfile_obstack. */
4401 subpst->dirname = pst->dirname;
4404 subpst->section_offsets = pst->section_offsets;
4405 subpst->textlow = 0;
4406 subpst->texthigh = 0;
4408 subpst->dependencies = (struct partial_symtab **)
4409 obstack_alloc (&objfile->objfile_obstack,
4410 sizeof (struct partial_symtab *));
4411 subpst->dependencies[0] = pst;
4412 subpst->number_of_dependencies = 1;
4414 subpst->globals_offset = 0;
4415 subpst->n_global_syms = 0;
4416 subpst->statics_offset = 0;
4417 subpst->n_static_syms = 0;
4418 subpst->symtab = NULL;
4419 subpst->read_symtab = pst->read_symtab;
4422 /* No private part is necessary for include psymtabs. This property
4423 can be used to differentiate between such include psymtabs and
4424 the regular ones. */
4425 subpst->read_symtab_private = NULL;
4428 /* Read the Line Number Program data and extract the list of files
4429 included by the source file represented by PST. Build an include
4430 partial symtab for each of these included files. */
4433 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4434 struct die_info *die,
4435 struct partial_symtab *pst)
4437 struct line_header *lh = NULL;
4438 struct attribute *attr;
4440 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4442 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4444 return; /* No linetable, so no includes. */
4446 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4447 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4449 free_line_header (lh);
4453 hash_signatured_type (const void *item)
4455 const struct signatured_type *sig_type = item;
4457 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4458 return sig_type->signature;
4462 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4464 const struct signatured_type *lhs = item_lhs;
4465 const struct signatured_type *rhs = item_rhs;
4467 return lhs->signature == rhs->signature;
4470 /* Allocate a hash table for signatured types. */
4473 allocate_signatured_type_table (struct objfile *objfile)
4475 return htab_create_alloc_ex (41,
4476 hash_signatured_type,
4479 &objfile->objfile_obstack,
4480 hashtab_obstack_allocate,
4481 dummy_obstack_deallocate);
4484 /* A helper function to add a signatured type CU to a table. */
4487 add_signatured_type_cu_to_table (void **slot, void *datum)
4489 struct signatured_type *sigt = *slot;
4490 struct signatured_type ***datap = datum;
4498 /* Create the hash table of all entries in the .debug_types
4499 (or .debug_types.dwo) section(s).
4500 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4501 otherwise it is NULL.
4503 The result is a pointer to the hash table or NULL if there are no types.
4505 Note: This function processes DWO files only, not DWP files. */
4508 create_debug_types_hash_table (struct dwo_file *dwo_file,
4509 VEC (dwarf2_section_info_def) *types)
4511 struct objfile *objfile = dwarf2_per_objfile->objfile;
4512 htab_t types_htab = NULL;
4514 struct dwarf2_section_info *section;
4515 struct dwarf2_section_info *abbrev_section;
4517 if (VEC_empty (dwarf2_section_info_def, types))
4520 abbrev_section = (dwo_file != NULL
4521 ? &dwo_file->sections.abbrev
4522 : &dwarf2_per_objfile->abbrev);
4524 if (dwarf2_read_debug)
4525 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4526 dwo_file ? ".dwo" : "",
4527 get_section_file_name (abbrev_section));
4530 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4534 const gdb_byte *info_ptr, *end_ptr;
4536 dwarf2_read_section (objfile, section);
4537 info_ptr = section->buffer;
4539 if (info_ptr == NULL)
4542 /* We can't set abfd until now because the section may be empty or
4543 not present, in which case the bfd is unknown. */
4544 abfd = get_section_bfd_owner (section);
4546 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4547 because we don't need to read any dies: the signature is in the
4550 end_ptr = info_ptr + section->size;
4551 while (info_ptr < end_ptr)
4554 cu_offset type_offset_in_tu;
4556 struct signatured_type *sig_type;
4557 struct dwo_unit *dwo_tu;
4559 const gdb_byte *ptr = info_ptr;
4560 struct comp_unit_head header;
4561 unsigned int length;
4563 offset.sect_off = ptr - section->buffer;
4565 /* We need to read the type's signature in order to build the hash
4566 table, but we don't need anything else just yet. */
4568 ptr = read_and_check_type_unit_head (&header, section,
4569 abbrev_section, ptr,
4570 &signature, &type_offset_in_tu);
4572 length = get_cu_length (&header);
4574 /* Skip dummy type units. */
4575 if (ptr >= info_ptr + length
4576 || peek_abbrev_code (abfd, ptr) == 0)
4582 if (types_htab == NULL)
4585 types_htab = allocate_dwo_unit_table (objfile);
4587 types_htab = allocate_signatured_type_table (objfile);
4593 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4595 dwo_tu->dwo_file = dwo_file;
4596 dwo_tu->signature = signature;
4597 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4598 dwo_tu->section = section;
4599 dwo_tu->offset = offset;
4600 dwo_tu->length = length;
4604 /* N.B.: type_offset is not usable if this type uses a DWO file.
4605 The real type_offset is in the DWO file. */
4607 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4608 struct signatured_type);
4609 sig_type->signature = signature;
4610 sig_type->type_offset_in_tu = type_offset_in_tu;
4611 sig_type->per_cu.objfile = objfile;
4612 sig_type->per_cu.is_debug_types = 1;
4613 sig_type->per_cu.section = section;
4614 sig_type->per_cu.offset = offset;
4615 sig_type->per_cu.length = length;
4618 slot = htab_find_slot (types_htab,
4619 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4621 gdb_assert (slot != NULL);
4624 sect_offset dup_offset;
4628 const struct dwo_unit *dup_tu = *slot;
4630 dup_offset = dup_tu->offset;
4634 const struct signatured_type *dup_tu = *slot;
4636 dup_offset = dup_tu->per_cu.offset;
4639 complaint (&symfile_complaints,
4640 _("debug type entry at offset 0x%x is duplicate to"
4641 " the entry at offset 0x%x, signature %s"),
4642 offset.sect_off, dup_offset.sect_off,
4643 hex_string (signature));
4645 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4647 if (dwarf2_read_debug > 1)
4648 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4650 hex_string (signature));
4659 /* Create the hash table of all entries in the .debug_types section,
4660 and initialize all_type_units.
4661 The result is zero if there is an error (e.g. missing .debug_types section),
4662 otherwise non-zero. */
4665 create_all_type_units (struct objfile *objfile)
4668 struct signatured_type **iter;
4670 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4671 if (types_htab == NULL)
4673 dwarf2_per_objfile->signatured_types = NULL;
4677 dwarf2_per_objfile->signatured_types = types_htab;
4679 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4680 dwarf2_per_objfile->all_type_units
4681 = xmalloc (dwarf2_per_objfile->n_type_units
4682 * sizeof (struct signatured_type *));
4683 iter = &dwarf2_per_objfile->all_type_units[0];
4684 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4685 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4686 == dwarf2_per_objfile->n_type_units);
4691 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4692 Fill in SIG_ENTRY with DWO_ENTRY. */
4695 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4696 struct signatured_type *sig_entry,
4697 struct dwo_unit *dwo_entry)
4699 /* Make sure we're not clobbering something we don't expect to. */
4700 gdb_assert (! sig_entry->per_cu.queued);
4701 gdb_assert (sig_entry->per_cu.cu == NULL);
4702 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4703 gdb_assert (sig_entry->per_cu.v.quick->symtab == NULL);
4704 gdb_assert (sig_entry->signature == dwo_entry->signature);
4705 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4706 gdb_assert (sig_entry->type_unit_group == NULL);
4707 gdb_assert (sig_entry->dwo_unit == NULL);
4709 sig_entry->per_cu.section = dwo_entry->section;
4710 sig_entry->per_cu.offset = dwo_entry->offset;
4711 sig_entry->per_cu.length = dwo_entry->length;
4712 sig_entry->per_cu.reading_dwo_directly = 1;
4713 sig_entry->per_cu.objfile = objfile;
4714 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4715 sig_entry->dwo_unit = dwo_entry;
4718 /* Subroutine of lookup_signatured_type.
4719 If we haven't read the TU yet, create the signatured_type data structure
4720 for a TU to be read in directly from a DWO file, bypassing the stub.
4721 This is the "Stay in DWO Optimization": When there is no DWP file and we're
4722 using .gdb_index, then when reading a CU we want to stay in the DWO file
4723 containing that CU. Otherwise we could end up reading several other DWO
4724 files (due to comdat folding) to process the transitive closure of all the
4725 mentioned TUs, and that can be slow. The current DWO file will have every
4726 type signature that it needs.
4727 We only do this for .gdb_index because in the psymtab case we already have
4728 to read all the DWOs to build the type unit groups. */
4730 static struct signatured_type *
4731 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4733 struct objfile *objfile = dwarf2_per_objfile->objfile;
4734 struct dwo_file *dwo_file;
4735 struct dwo_unit find_dwo_entry, *dwo_entry;
4736 struct signatured_type find_sig_entry, *sig_entry;
4738 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4740 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4741 dwo_unit of the TU itself. */
4742 dwo_file = cu->dwo_unit->dwo_file;
4744 /* We only ever need to read in one copy of a signatured type.
4745 Just use the global signatured_types array. If this is the first time
4746 we're reading this type, replace the recorded data from .gdb_index with
4749 if (dwarf2_per_objfile->signatured_types == NULL)
4751 find_sig_entry.signature = sig;
4752 sig_entry = htab_find (dwarf2_per_objfile->signatured_types, &find_sig_entry);
4753 if (sig_entry == NULL)
4756 /* We can get here with the TU already read, *or* in the process of being
4757 read. Don't reassign it if that's the case. Also note that if the TU is
4758 already being read, it may not have come from a DWO, the program may be
4759 a mix of Fission-compiled code and non-Fission-compiled code. */
4760 /* Have we already tried to read this TU? */
4761 if (sig_entry->per_cu.tu_read)
4764 /* Ok, this is the first time we're reading this TU. */
4765 if (dwo_file->tus == NULL)
4767 find_dwo_entry.signature = sig;
4768 dwo_entry = htab_find (dwo_file->tus, &find_dwo_entry);
4769 if (dwo_entry == NULL)
4772 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4773 sig_entry->per_cu.tu_read = 1;
4777 /* Subroutine of lookup_dwp_signatured_type.
4778 Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. */
4780 static struct signatured_type *
4781 add_type_unit (ULONGEST sig)
4783 struct objfile *objfile = dwarf2_per_objfile->objfile;
4784 int n_type_units = dwarf2_per_objfile->n_type_units;
4785 struct signatured_type *sig_type;
4789 dwarf2_per_objfile->all_type_units =
4790 xrealloc (dwarf2_per_objfile->all_type_units,
4791 n_type_units * sizeof (struct signatured_type *));
4792 dwarf2_per_objfile->n_type_units = n_type_units;
4793 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4794 struct signatured_type);
4795 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4796 sig_type->signature = sig;
4797 sig_type->per_cu.is_debug_types = 1;
4798 sig_type->per_cu.v.quick =
4799 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4800 struct dwarf2_per_cu_quick_data);
4801 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4803 gdb_assert (*slot == NULL);
4805 /* The rest of sig_type must be filled in by the caller. */
4809 /* Subroutine of lookup_signatured_type.
4810 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4811 then try the DWP file.
4812 Normally this "can't happen", but if there's a bug in signature
4813 generation and/or the DWP file is built incorrectly, it can happen.
4814 Using the type directly from the DWP file means we don't have the stub
4815 which has some useful attributes (e.g., DW_AT_comp_dir), but they're
4816 not critical. [Eventually the stub may go away for type units anyway.] */
4818 static struct signatured_type *
4819 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4821 struct objfile *objfile = dwarf2_per_objfile->objfile;
4822 struct dwp_file *dwp_file = get_dwp_file ();
4823 struct dwo_unit *dwo_entry;
4824 struct signatured_type find_sig_entry, *sig_entry;
4826 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4827 gdb_assert (dwp_file != NULL);
4829 if (dwarf2_per_objfile->signatured_types != NULL)
4831 find_sig_entry.signature = sig;
4832 sig_entry = htab_find (dwarf2_per_objfile->signatured_types,
4834 if (sig_entry != NULL)
4838 /* This is the "shouldn't happen" case.
4839 Try the DWP file and hope for the best. */
4840 if (dwp_file->tus == NULL)
4842 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
4843 sig, 1 /* is_debug_types */);
4844 if (dwo_entry == NULL)
4847 sig_entry = add_type_unit (sig);
4848 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4850 /* The caller will signal a complaint if we return NULL.
4851 Here we don't return NULL but we still want to complain. */
4852 complaint (&symfile_complaints,
4853 _("Bad type signature %s referenced by %s at 0x%x,"
4854 " coping by using copy in DWP [in module %s]"),
4856 cu->per_cu->is_debug_types ? "TU" : "CU",
4857 cu->per_cu->offset.sect_off,
4858 objfile_name (objfile));
4863 /* Lookup a signature based type for DW_FORM_ref_sig8.
4864 Returns NULL if signature SIG is not present in the table.
4865 It is up to the caller to complain about this. */
4867 static struct signatured_type *
4868 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4871 && dwarf2_per_objfile->using_index)
4873 /* We're in a DWO/DWP file, and we're using .gdb_index.
4874 These cases require special processing. */
4875 if (get_dwp_file () == NULL)
4876 return lookup_dwo_signatured_type (cu, sig);
4878 return lookup_dwp_signatured_type (cu, sig);
4882 struct signatured_type find_entry, *entry;
4884 if (dwarf2_per_objfile->signatured_types == NULL)
4886 find_entry.signature = sig;
4887 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4892 /* Low level DIE reading support. */
4894 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4897 init_cu_die_reader (struct die_reader_specs *reader,
4898 struct dwarf2_cu *cu,
4899 struct dwarf2_section_info *section,
4900 struct dwo_file *dwo_file)
4902 gdb_assert (section->readin && section->buffer != NULL);
4903 reader->abfd = get_section_bfd_owner (section);
4905 reader->dwo_file = dwo_file;
4906 reader->die_section = section;
4907 reader->buffer = section->buffer;
4908 reader->buffer_end = section->buffer + section->size;
4909 reader->comp_dir = NULL;
4912 /* Subroutine of init_cutu_and_read_dies to simplify it.
4913 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4914 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4917 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4918 from it to the DIE in the DWO. If NULL we are skipping the stub.
4919 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
4920 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
4921 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
4922 STUB_COMP_DIR may be non-NULL.
4923 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4924 are filled in with the info of the DIE from the DWO file.
4925 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4926 provided an abbrev table to use.
4927 The result is non-zero if a valid (non-dummy) DIE was found. */
4930 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4931 struct dwo_unit *dwo_unit,
4932 int abbrev_table_provided,
4933 struct die_info *stub_comp_unit_die,
4934 const char *stub_comp_dir,
4935 struct die_reader_specs *result_reader,
4936 const gdb_byte **result_info_ptr,
4937 struct die_info **result_comp_unit_die,
4938 int *result_has_children)
4940 struct objfile *objfile = dwarf2_per_objfile->objfile;
4941 struct dwarf2_cu *cu = this_cu->cu;
4942 struct dwarf2_section_info *section;
4944 const gdb_byte *begin_info_ptr, *info_ptr;
4945 ULONGEST signature; /* Or dwo_id. */
4946 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4947 int i,num_extra_attrs;
4948 struct dwarf2_section_info *dwo_abbrev_section;
4949 struct attribute *attr;
4950 struct die_info *comp_unit_die;
4952 /* At most one of these may be provided. */
4953 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
4955 /* These attributes aren't processed until later:
4956 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4957 DW_AT_comp_dir is used now, to find the DWO file, but it is also
4958 referenced later. However, these attributes are found in the stub
4959 which we won't have later. In order to not impose this complication
4960 on the rest of the code, we read them here and copy them to the
4969 if (stub_comp_unit_die != NULL)
4971 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4973 if (! this_cu->is_debug_types)
4974 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4975 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4976 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4977 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4978 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4980 /* There should be a DW_AT_addr_base attribute here (if needed).
4981 We need the value before we can process DW_FORM_GNU_addr_index. */
4983 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4985 cu->addr_base = DW_UNSND (attr);
4987 /* There should be a DW_AT_ranges_base attribute here (if needed).
4988 We need the value before we can process DW_AT_ranges. */
4989 cu->ranges_base = 0;
4990 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4992 cu->ranges_base = DW_UNSND (attr);
4994 else if (stub_comp_dir != NULL)
4996 /* Reconstruct the comp_dir attribute to simplify the code below. */
4997 comp_dir = (struct attribute *)
4998 obstack_alloc (&cu->comp_unit_obstack, sizeof (*comp_dir));
4999 comp_dir->name = DW_AT_comp_dir;
5000 comp_dir->form = DW_FORM_string;
5001 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5002 DW_STRING (comp_dir) = stub_comp_dir;
5005 /* Set up for reading the DWO CU/TU. */
5006 cu->dwo_unit = dwo_unit;
5007 section = dwo_unit->section;
5008 dwarf2_read_section (objfile, section);
5009 abfd = get_section_bfd_owner (section);
5010 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
5011 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5012 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5014 if (this_cu->is_debug_types)
5016 ULONGEST header_signature;
5017 cu_offset type_offset_in_tu;
5018 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5020 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5024 &type_offset_in_tu);
5025 /* This is not an assert because it can be caused by bad debug info. */
5026 if (sig_type->signature != header_signature)
5028 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5029 " TU at offset 0x%x [in module %s]"),
5030 hex_string (sig_type->signature),
5031 hex_string (header_signature),
5032 dwo_unit->offset.sect_off,
5033 bfd_get_filename (abfd));
5035 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5036 /* For DWOs coming from DWP files, we don't know the CU length
5037 nor the type's offset in the TU until now. */
5038 dwo_unit->length = get_cu_length (&cu->header);
5039 dwo_unit->type_offset_in_tu = type_offset_in_tu;
5041 /* Establish the type offset that can be used to lookup the type.
5042 For DWO files, we don't know it until now. */
5043 sig_type->type_offset_in_section.sect_off =
5044 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
5048 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5051 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5052 /* For DWOs coming from DWP files, we don't know the CU length
5054 dwo_unit->length = get_cu_length (&cu->header);
5057 /* Replace the CU's original abbrev table with the DWO's.
5058 Reminder: We can't read the abbrev table until we've read the header. */
5059 if (abbrev_table_provided)
5061 /* Don't free the provided abbrev table, the caller of
5062 init_cutu_and_read_dies owns it. */
5063 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5064 /* Ensure the DWO abbrev table gets freed. */
5065 make_cleanup (dwarf2_free_abbrev_table, cu);
5069 dwarf2_free_abbrev_table (cu);
5070 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5071 /* Leave any existing abbrev table cleanup as is. */
5074 /* Read in the die, but leave space to copy over the attributes
5075 from the stub. This has the benefit of simplifying the rest of
5076 the code - all the work to maintain the illusion of a single
5077 DW_TAG_{compile,type}_unit DIE is done here. */
5078 num_extra_attrs = ((stmt_list != NULL)
5082 + (comp_dir != NULL));
5083 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5084 result_has_children, num_extra_attrs);
5086 /* Copy over the attributes from the stub to the DIE we just read in. */
5087 comp_unit_die = *result_comp_unit_die;
5088 i = comp_unit_die->num_attrs;
5089 if (stmt_list != NULL)
5090 comp_unit_die->attrs[i++] = *stmt_list;
5092 comp_unit_die->attrs[i++] = *low_pc;
5093 if (high_pc != NULL)
5094 comp_unit_die->attrs[i++] = *high_pc;
5096 comp_unit_die->attrs[i++] = *ranges;
5097 if (comp_dir != NULL)
5098 comp_unit_die->attrs[i++] = *comp_dir;
5099 comp_unit_die->num_attrs += num_extra_attrs;
5101 if (dwarf2_die_debug)
5103 fprintf_unfiltered (gdb_stdlog,
5104 "Read die from %s@0x%x of %s:\n",
5105 get_section_name (section),
5106 (unsigned) (begin_info_ptr - section->buffer),
5107 bfd_get_filename (abfd));
5108 dump_die (comp_unit_die, dwarf2_die_debug);
5111 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5112 TUs by skipping the stub and going directly to the entry in the DWO file.
5113 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5114 to get it via circuitous means. Blech. */
5115 if (comp_dir != NULL)
5116 result_reader->comp_dir = DW_STRING (comp_dir);
5118 /* Skip dummy compilation units. */
5119 if (info_ptr >= begin_info_ptr + dwo_unit->length
5120 || peek_abbrev_code (abfd, info_ptr) == 0)
5123 *result_info_ptr = info_ptr;
5127 /* Subroutine of init_cutu_and_read_dies to simplify it.
5128 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5129 Returns NULL if the specified DWO unit cannot be found. */
5131 static struct dwo_unit *
5132 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5133 struct die_info *comp_unit_die)
5135 struct dwarf2_cu *cu = this_cu->cu;
5136 struct attribute *attr;
5138 struct dwo_unit *dwo_unit;
5139 const char *comp_dir, *dwo_name;
5141 gdb_assert (cu != NULL);
5143 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5144 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5145 gdb_assert (attr != NULL);
5146 dwo_name = DW_STRING (attr);
5148 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5150 comp_dir = DW_STRING (attr);
5152 if (this_cu->is_debug_types)
5154 struct signatured_type *sig_type;
5156 /* Since this_cu is the first member of struct signatured_type,
5157 we can go from a pointer to one to a pointer to the other. */
5158 sig_type = (struct signatured_type *) this_cu;
5159 signature = sig_type->signature;
5160 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5164 struct attribute *attr;
5166 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5168 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5170 dwo_name, objfile_name (this_cu->objfile));
5171 signature = DW_UNSND (attr);
5172 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5179 /* Subroutine of init_cutu_and_read_dies to simplify it.
5180 Read a TU directly from a DWO file, bypassing the stub. */
5183 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, int keep,
5184 die_reader_func_ftype *die_reader_func,
5187 struct dwarf2_cu *cu;
5188 struct signatured_type *sig_type;
5189 struct cleanup *cleanups, *free_cu_cleanup;
5190 struct die_reader_specs reader;
5191 const gdb_byte *info_ptr;
5192 struct die_info *comp_unit_die;
5195 /* Verify we can do the following downcast, and that we have the
5197 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5198 sig_type = (struct signatured_type *) this_cu;
5199 gdb_assert (sig_type->dwo_unit != NULL);
5201 cleanups = make_cleanup (null_cleanup, NULL);
5203 gdb_assert (this_cu->cu == NULL);
5204 cu = xmalloc (sizeof (*cu));
5205 init_one_comp_unit (cu, this_cu);
5206 /* If an error occurs while loading, release our storage. */
5207 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5209 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5210 0 /* abbrev_table_provided */,
5211 NULL /* stub_comp_unit_die */,
5212 sig_type->dwo_unit->dwo_file->comp_dir,
5214 &comp_unit_die, &has_children) == 0)
5217 do_cleanups (cleanups);
5221 /* All the "real" work is done here. */
5222 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5224 /* This duplicates some code in init_cutu_and_read_dies,
5225 but the alternative is making the latter more complex.
5226 This function is only for the special case of using DWO files directly:
5227 no point in overly complicating the general case just to handle this. */
5230 /* We've successfully allocated this compilation unit. Let our
5231 caller clean it up when finished with it. */
5232 discard_cleanups (free_cu_cleanup);
5234 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5235 So we have to manually free the abbrev table. */
5236 dwarf2_free_abbrev_table (cu);
5238 /* Link this CU into read_in_chain. */
5239 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5240 dwarf2_per_objfile->read_in_chain = this_cu;
5243 do_cleanups (free_cu_cleanup);
5245 do_cleanups (cleanups);
5248 /* Initialize a CU (or TU) and read its DIEs.
5249 If the CU defers to a DWO file, read the DWO file as well.
5251 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5252 Otherwise the table specified in the comp unit header is read in and used.
5253 This is an optimization for when we already have the abbrev table.
5255 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5256 Otherwise, a new CU is allocated with xmalloc.
5258 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5259 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5261 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5262 linker) then DIE_READER_FUNC will not get called. */
5265 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5266 struct abbrev_table *abbrev_table,
5267 int use_existing_cu, int keep,
5268 die_reader_func_ftype *die_reader_func,
5271 struct objfile *objfile = dwarf2_per_objfile->objfile;
5272 struct dwarf2_section_info *section = this_cu->section;
5273 bfd *abfd = get_section_bfd_owner (section);
5274 struct dwarf2_cu *cu;
5275 const gdb_byte *begin_info_ptr, *info_ptr;
5276 struct die_reader_specs reader;
5277 struct die_info *comp_unit_die;
5279 struct attribute *attr;
5280 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5281 struct signatured_type *sig_type = NULL;
5282 struct dwarf2_section_info *abbrev_section;
5283 /* Non-zero if CU currently points to a DWO file and we need to
5284 reread it. When this happens we need to reread the skeleton die
5285 before we can reread the DWO file (this only applies to CUs, not TUs). */
5286 int rereading_dwo_cu = 0;
5288 if (dwarf2_die_debug)
5289 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5290 this_cu->is_debug_types ? "type" : "comp",
5291 this_cu->offset.sect_off);
5293 if (use_existing_cu)
5296 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5297 file (instead of going through the stub), short-circuit all of this. */
5298 if (this_cu->reading_dwo_directly)
5300 /* Narrow down the scope of possibilities to have to understand. */
5301 gdb_assert (this_cu->is_debug_types);
5302 gdb_assert (abbrev_table == NULL);
5303 gdb_assert (!use_existing_cu);
5304 init_tu_and_read_dwo_dies (this_cu, keep, die_reader_func, data);
5308 cleanups = make_cleanup (null_cleanup, NULL);
5310 /* This is cheap if the section is already read in. */
5311 dwarf2_read_section (objfile, section);
5313 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5315 abbrev_section = get_abbrev_section_for_cu (this_cu);
5317 if (use_existing_cu && this_cu->cu != NULL)
5321 /* If this CU is from a DWO file we need to start over, we need to
5322 refetch the attributes from the skeleton CU.
5323 This could be optimized by retrieving those attributes from when we
5324 were here the first time: the previous comp_unit_die was stored in
5325 comp_unit_obstack. But there's no data yet that we need this
5327 if (cu->dwo_unit != NULL)
5328 rereading_dwo_cu = 1;
5332 /* If !use_existing_cu, this_cu->cu must be NULL. */
5333 gdb_assert (this_cu->cu == NULL);
5335 cu = xmalloc (sizeof (*cu));
5336 init_one_comp_unit (cu, this_cu);
5338 /* If an error occurs while loading, release our storage. */
5339 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5342 /* Get the header. */
5343 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5345 /* We already have the header, there's no need to read it in again. */
5346 info_ptr += cu->header.first_die_offset.cu_off;
5350 if (this_cu->is_debug_types)
5353 cu_offset type_offset_in_tu;
5355 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5356 abbrev_section, info_ptr,
5358 &type_offset_in_tu);
5360 /* Since per_cu is the first member of struct signatured_type,
5361 we can go from a pointer to one to a pointer to the other. */
5362 sig_type = (struct signatured_type *) this_cu;
5363 gdb_assert (sig_type->signature == signature);
5364 gdb_assert (sig_type->type_offset_in_tu.cu_off
5365 == type_offset_in_tu.cu_off);
5366 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5368 /* LENGTH has not been set yet for type units if we're
5369 using .gdb_index. */
5370 this_cu->length = get_cu_length (&cu->header);
5372 /* Establish the type offset that can be used to lookup the type. */
5373 sig_type->type_offset_in_section.sect_off =
5374 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5378 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5382 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5383 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5387 /* Skip dummy compilation units. */
5388 if (info_ptr >= begin_info_ptr + this_cu->length
5389 || peek_abbrev_code (abfd, info_ptr) == 0)
5391 do_cleanups (cleanups);
5395 /* If we don't have them yet, read the abbrevs for this compilation unit.
5396 And if we need to read them now, make sure they're freed when we're
5397 done. Note that it's important that if the CU had an abbrev table
5398 on entry we don't free it when we're done: Somewhere up the call stack
5399 it may be in use. */
5400 if (abbrev_table != NULL)
5402 gdb_assert (cu->abbrev_table == NULL);
5403 gdb_assert (cu->header.abbrev_offset.sect_off
5404 == abbrev_table->offset.sect_off);
5405 cu->abbrev_table = abbrev_table;
5407 else if (cu->abbrev_table == NULL)
5409 dwarf2_read_abbrevs (cu, abbrev_section);
5410 make_cleanup (dwarf2_free_abbrev_table, cu);
5412 else if (rereading_dwo_cu)
5414 dwarf2_free_abbrev_table (cu);
5415 dwarf2_read_abbrevs (cu, abbrev_section);
5418 /* Read the top level CU/TU die. */
5419 init_cu_die_reader (&reader, cu, section, NULL);
5420 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5422 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5424 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5425 DWO CU, that this test will fail (the attribute will not be present). */
5426 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5429 struct dwo_unit *dwo_unit;
5430 struct die_info *dwo_comp_unit_die;
5434 complaint (&symfile_complaints,
5435 _("compilation unit with DW_AT_GNU_dwo_name"
5436 " has children (offset 0x%x) [in module %s]"),
5437 this_cu->offset.sect_off, bfd_get_filename (abfd));
5439 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5440 if (dwo_unit != NULL)
5442 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5443 abbrev_table != NULL,
5444 comp_unit_die, NULL,
5446 &dwo_comp_unit_die, &has_children) == 0)
5449 do_cleanups (cleanups);
5452 comp_unit_die = dwo_comp_unit_die;
5456 /* Yikes, we couldn't find the rest of the DIE, we only have
5457 the stub. A complaint has already been logged. There's
5458 not much more we can do except pass on the stub DIE to
5459 die_reader_func. We don't want to throw an error on bad
5464 /* All of the above is setup for this call. Yikes. */
5465 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5467 /* Done, clean up. */
5468 if (free_cu_cleanup != NULL)
5472 /* We've successfully allocated this compilation unit. Let our
5473 caller clean it up when finished with it. */
5474 discard_cleanups (free_cu_cleanup);
5476 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5477 So we have to manually free the abbrev table. */
5478 dwarf2_free_abbrev_table (cu);
5480 /* Link this CU into read_in_chain. */
5481 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5482 dwarf2_per_objfile->read_in_chain = this_cu;
5485 do_cleanups (free_cu_cleanup);
5488 do_cleanups (cleanups);
5491 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5492 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5493 to have already done the lookup to find the DWO file).
5495 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5496 THIS_CU->is_debug_types, but nothing else.
5498 We fill in THIS_CU->length.
5500 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5501 linker) then DIE_READER_FUNC will not get called.
5503 THIS_CU->cu is always freed when done.
5504 This is done in order to not leave THIS_CU->cu in a state where we have
5505 to care whether it refers to the "main" CU or the DWO CU. */
5508 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5509 struct dwo_file *dwo_file,
5510 die_reader_func_ftype *die_reader_func,
5513 struct objfile *objfile = dwarf2_per_objfile->objfile;
5514 struct dwarf2_section_info *section = this_cu->section;
5515 bfd *abfd = get_section_bfd_owner (section);
5516 struct dwarf2_section_info *abbrev_section;
5517 struct dwarf2_cu cu;
5518 const gdb_byte *begin_info_ptr, *info_ptr;
5519 struct die_reader_specs reader;
5520 struct cleanup *cleanups;
5521 struct die_info *comp_unit_die;
5524 if (dwarf2_die_debug)
5525 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5526 this_cu->is_debug_types ? "type" : "comp",
5527 this_cu->offset.sect_off);
5529 gdb_assert (this_cu->cu == NULL);
5531 abbrev_section = (dwo_file != NULL
5532 ? &dwo_file->sections.abbrev
5533 : get_abbrev_section_for_cu (this_cu));
5535 /* This is cheap if the section is already read in. */
5536 dwarf2_read_section (objfile, section);
5538 init_one_comp_unit (&cu, this_cu);
5540 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5542 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5543 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5544 abbrev_section, info_ptr,
5545 this_cu->is_debug_types);
5547 this_cu->length = get_cu_length (&cu.header);
5549 /* Skip dummy compilation units. */
5550 if (info_ptr >= begin_info_ptr + this_cu->length
5551 || peek_abbrev_code (abfd, info_ptr) == 0)
5553 do_cleanups (cleanups);
5557 dwarf2_read_abbrevs (&cu, abbrev_section);
5558 make_cleanup (dwarf2_free_abbrev_table, &cu);
5560 init_cu_die_reader (&reader, &cu, section, dwo_file);
5561 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5563 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5565 do_cleanups (cleanups);
5568 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5569 does not lookup the specified DWO file.
5570 This cannot be used to read DWO files.
5572 THIS_CU->cu is always freed when done.
5573 This is done in order to not leave THIS_CU->cu in a state where we have
5574 to care whether it refers to the "main" CU or the DWO CU.
5575 We can revisit this if the data shows there's a performance issue. */
5578 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5579 die_reader_func_ftype *die_reader_func,
5582 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5585 /* Type Unit Groups.
5587 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5588 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5589 so that all types coming from the same compilation (.o file) are grouped
5590 together. A future step could be to put the types in the same symtab as
5591 the CU the types ultimately came from. */
5594 hash_type_unit_group (const void *item)
5596 const struct type_unit_group *tu_group = item;
5598 return hash_stmt_list_entry (&tu_group->hash);
5602 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5604 const struct type_unit_group *lhs = item_lhs;
5605 const struct type_unit_group *rhs = item_rhs;
5607 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5610 /* Allocate a hash table for type unit groups. */
5613 allocate_type_unit_groups_table (void)
5615 return htab_create_alloc_ex (3,
5616 hash_type_unit_group,
5619 &dwarf2_per_objfile->objfile->objfile_obstack,
5620 hashtab_obstack_allocate,
5621 dummy_obstack_deallocate);
5624 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5625 partial symtabs. We combine several TUs per psymtab to not let the size
5626 of any one psymtab grow too big. */
5627 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5628 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5630 /* Helper routine for get_type_unit_group.
5631 Create the type_unit_group object used to hold one or more TUs. */
5633 static struct type_unit_group *
5634 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5636 struct objfile *objfile = dwarf2_per_objfile->objfile;
5637 struct dwarf2_per_cu_data *per_cu;
5638 struct type_unit_group *tu_group;
5640 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5641 struct type_unit_group);
5642 per_cu = &tu_group->per_cu;
5643 per_cu->objfile = objfile;
5645 if (dwarf2_per_objfile->using_index)
5647 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5648 struct dwarf2_per_cu_quick_data);
5652 unsigned int line_offset = line_offset_struct.sect_off;
5653 struct partial_symtab *pst;
5656 /* Give the symtab a useful name for debug purposes. */
5657 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5658 name = xstrprintf ("<type_units_%d>",
5659 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5661 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5663 pst = create_partial_symtab (per_cu, name);
5669 tu_group->hash.dwo_unit = cu->dwo_unit;
5670 tu_group->hash.line_offset = line_offset_struct;
5675 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5676 STMT_LIST is a DW_AT_stmt_list attribute. */
5678 static struct type_unit_group *
5679 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
5681 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5682 struct type_unit_group *tu_group;
5684 unsigned int line_offset;
5685 struct type_unit_group type_unit_group_for_lookup;
5687 if (dwarf2_per_objfile->type_unit_groups == NULL)
5689 dwarf2_per_objfile->type_unit_groups =
5690 allocate_type_unit_groups_table ();
5693 /* Do we need to create a new group, or can we use an existing one? */
5697 line_offset = DW_UNSND (stmt_list);
5698 ++tu_stats->nr_symtab_sharers;
5702 /* Ugh, no stmt_list. Rare, but we have to handle it.
5703 We can do various things here like create one group per TU or
5704 spread them over multiple groups to split up the expansion work.
5705 To avoid worst case scenarios (too many groups or too large groups)
5706 we, umm, group them in bunches. */
5707 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5708 | (tu_stats->nr_stmt_less_type_units
5709 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5710 ++tu_stats->nr_stmt_less_type_units;
5713 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5714 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5715 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5716 &type_unit_group_for_lookup, INSERT);
5720 gdb_assert (tu_group != NULL);
5724 sect_offset line_offset_struct;
5726 line_offset_struct.sect_off = line_offset;
5727 tu_group = create_type_unit_group (cu, line_offset_struct);
5729 ++tu_stats->nr_symtabs;
5735 /* Struct used to sort TUs by their abbreviation table offset. */
5737 struct tu_abbrev_offset
5739 struct signatured_type *sig_type;
5740 sect_offset abbrev_offset;
5743 /* Helper routine for build_type_unit_groups, passed to qsort. */
5746 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5748 const struct tu_abbrev_offset * const *a = ap;
5749 const struct tu_abbrev_offset * const *b = bp;
5750 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5751 unsigned int boff = (*b)->abbrev_offset.sect_off;
5753 return (aoff > boff) - (aoff < boff);
5756 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5757 each one passing FUNC,DATA.
5759 The efficiency is because we sort TUs by the abbrev table they use and
5760 only read each abbrev table once. In one program there are 200K TUs
5761 sharing 8K abbrev tables.
5763 The main purpose of this function is to support building the
5764 dwarf2_per_objfile->type_unit_groups table.
5765 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5766 can collapse the search space by grouping them by stmt_list.
5767 The savings can be significant, in the same program from above the 200K TUs
5768 share 8K stmt_list tables.
5770 FUNC is expected to call get_type_unit_group, which will create the
5771 struct type_unit_group if necessary and add it to
5772 dwarf2_per_objfile->type_unit_groups. */
5775 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5777 struct objfile *objfile = dwarf2_per_objfile->objfile;
5778 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5779 struct cleanup *cleanups;
5780 struct abbrev_table *abbrev_table;
5781 sect_offset abbrev_offset;
5782 struct tu_abbrev_offset *sorted_by_abbrev;
5783 struct type_unit_group **iter;
5786 /* It's up to the caller to not call us multiple times. */
5787 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5789 if (dwarf2_per_objfile->n_type_units == 0)
5792 /* TUs typically share abbrev tables, and there can be way more TUs than
5793 abbrev tables. Sort by abbrev table to reduce the number of times we
5794 read each abbrev table in.
5795 Alternatives are to punt or to maintain a cache of abbrev tables.
5796 This is simpler and efficient enough for now.
5798 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5799 symtab to use). Typically TUs with the same abbrev offset have the same
5800 stmt_list value too so in practice this should work well.
5802 The basic algorithm here is:
5804 sort TUs by abbrev table
5805 for each TU with same abbrev table:
5806 read abbrev table if first user
5807 read TU top level DIE
5808 [IWBN if DWO skeletons had DW_AT_stmt_list]
5811 if (dwarf2_read_debug)
5812 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5814 /* Sort in a separate table to maintain the order of all_type_units
5815 for .gdb_index: TU indices directly index all_type_units. */
5816 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5817 dwarf2_per_objfile->n_type_units);
5818 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5820 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5822 sorted_by_abbrev[i].sig_type = sig_type;
5823 sorted_by_abbrev[i].abbrev_offset =
5824 read_abbrev_offset (sig_type->per_cu.section,
5825 sig_type->per_cu.offset);
5827 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5828 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5829 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5831 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5832 called any number of times, so we don't reset tu_stats here. */
5834 abbrev_offset.sect_off = ~(unsigned) 0;
5835 abbrev_table = NULL;
5836 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5838 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5840 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5842 /* Switch to the next abbrev table if necessary. */
5843 if (abbrev_table == NULL
5844 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5846 if (abbrev_table != NULL)
5848 abbrev_table_free (abbrev_table);
5849 /* Reset to NULL in case abbrev_table_read_table throws
5850 an error: abbrev_table_free_cleanup will get called. */
5851 abbrev_table = NULL;
5853 abbrev_offset = tu->abbrev_offset;
5855 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5857 ++tu_stats->nr_uniq_abbrev_tables;
5860 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5864 /* type_unit_groups can be NULL if there is an error in the debug info.
5865 Just create an empty table so the rest of gdb doesn't have to watch
5866 for this error case. */
5867 if (dwarf2_per_objfile->type_unit_groups == NULL)
5869 dwarf2_per_objfile->type_unit_groups =
5870 allocate_type_unit_groups_table ();
5873 do_cleanups (cleanups);
5875 if (dwarf2_read_debug)
5877 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5878 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5879 dwarf2_per_objfile->n_type_units);
5880 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5881 tu_stats->nr_uniq_abbrev_tables);
5882 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5883 tu_stats->nr_symtabs);
5884 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5885 tu_stats->nr_symtab_sharers);
5886 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5887 tu_stats->nr_stmt_less_type_units);
5891 /* Partial symbol tables. */
5893 /* Create a psymtab named NAME and assign it to PER_CU.
5895 The caller must fill in the following details:
5896 dirname, textlow, texthigh. */
5898 static struct partial_symtab *
5899 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5901 struct objfile *objfile = per_cu->objfile;
5902 struct partial_symtab *pst;
5904 pst = start_psymtab_common (objfile, objfile->section_offsets,
5906 objfile->global_psymbols.next,
5907 objfile->static_psymbols.next);
5909 pst->psymtabs_addrmap_supported = 1;
5911 /* This is the glue that links PST into GDB's symbol API. */
5912 pst->read_symtab_private = per_cu;
5913 pst->read_symtab = dwarf2_read_symtab;
5914 per_cu->v.psymtab = pst;
5919 /* The DATA object passed to process_psymtab_comp_unit_reader has this
5922 struct process_psymtab_comp_unit_data
5924 /* True if we are reading a DW_TAG_partial_unit. */
5926 int want_partial_unit;
5928 /* The "pretend" language that is used if the CU doesn't declare a
5931 enum language pretend_language;
5934 /* die_reader_func for process_psymtab_comp_unit. */
5937 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5938 const gdb_byte *info_ptr,
5939 struct die_info *comp_unit_die,
5943 struct dwarf2_cu *cu = reader->cu;
5944 struct objfile *objfile = cu->objfile;
5945 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5946 struct attribute *attr;
5948 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5949 struct partial_symtab *pst;
5951 const char *filename;
5952 struct process_psymtab_comp_unit_data *info = data;
5954 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
5957 gdb_assert (! per_cu->is_debug_types);
5959 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
5961 cu->list_in_scope = &file_symbols;
5963 /* Allocate a new partial symbol table structure. */
5964 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5965 if (attr == NULL || !DW_STRING (attr))
5968 filename = DW_STRING (attr);
5970 pst = create_partial_symtab (per_cu, filename);
5972 /* This must be done before calling dwarf2_build_include_psymtabs. */
5973 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5975 pst->dirname = DW_STRING (attr);
5977 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5979 dwarf2_find_base_address (comp_unit_die, cu);
5981 /* Possibly set the default values of LOWPC and HIGHPC from
5983 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5984 &best_highpc, cu, pst);
5985 if (has_pc_info == 1 && best_lowpc < best_highpc)
5986 /* Store the contiguous range if it is not empty; it can be empty for
5987 CUs with no code. */
5988 addrmap_set_empty (objfile->psymtabs_addrmap,
5989 best_lowpc + baseaddr,
5990 best_highpc + baseaddr - 1, pst);
5992 /* Check if comp unit has_children.
5993 If so, read the rest of the partial symbols from this comp unit.
5994 If not, there's no more debug_info for this comp unit. */
5997 struct partial_die_info *first_die;
5998 CORE_ADDR lowpc, highpc;
6000 lowpc = ((CORE_ADDR) -1);
6001 highpc = ((CORE_ADDR) 0);
6003 first_die = load_partial_dies (reader, info_ptr, 1);
6005 scan_partial_symbols (first_die, &lowpc, &highpc,
6008 /* If we didn't find a lowpc, set it to highpc to avoid
6009 complaints from `maint check'. */
6010 if (lowpc == ((CORE_ADDR) -1))
6013 /* If the compilation unit didn't have an explicit address range,
6014 then use the information extracted from its child dies. */
6018 best_highpc = highpc;
6021 pst->textlow = best_lowpc + baseaddr;
6022 pst->texthigh = best_highpc + baseaddr;
6024 pst->n_global_syms = objfile->global_psymbols.next -
6025 (objfile->global_psymbols.list + pst->globals_offset);
6026 pst->n_static_syms = objfile->static_psymbols.next -
6027 (objfile->static_psymbols.list + pst->statics_offset);
6028 sort_pst_symbols (objfile, pst);
6030 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6033 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6034 struct dwarf2_per_cu_data *iter;
6036 /* Fill in 'dependencies' here; we fill in 'users' in a
6038 pst->number_of_dependencies = len;
6039 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
6040 len * sizeof (struct symtab *));
6042 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6045 pst->dependencies[i] = iter->v.psymtab;
6047 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6050 /* Get the list of files included in the current compilation unit,
6051 and build a psymtab for each of them. */
6052 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6054 if (dwarf2_read_debug)
6056 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6058 fprintf_unfiltered (gdb_stdlog,
6059 "Psymtab for %s unit @0x%x: %s - %s"
6060 ", %d global, %d static syms\n",
6061 per_cu->is_debug_types ? "type" : "comp",
6062 per_cu->offset.sect_off,
6063 paddress (gdbarch, pst->textlow),
6064 paddress (gdbarch, pst->texthigh),
6065 pst->n_global_syms, pst->n_static_syms);
6069 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6070 Process compilation unit THIS_CU for a psymtab. */
6073 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6074 int want_partial_unit,
6075 enum language pretend_language)
6077 struct process_psymtab_comp_unit_data info;
6079 /* If this compilation unit was already read in, free the
6080 cached copy in order to read it in again. This is
6081 necessary because we skipped some symbols when we first
6082 read in the compilation unit (see load_partial_dies).
6083 This problem could be avoided, but the benefit is unclear. */
6084 if (this_cu->cu != NULL)
6085 free_one_cached_comp_unit (this_cu);
6087 gdb_assert (! this_cu->is_debug_types);
6088 info.want_partial_unit = want_partial_unit;
6089 info.pretend_language = pretend_language;
6090 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6091 process_psymtab_comp_unit_reader,
6094 /* Age out any secondary CUs. */
6095 age_cached_comp_units ();
6098 /* Reader function for build_type_psymtabs. */
6101 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6102 const gdb_byte *info_ptr,
6103 struct die_info *type_unit_die,
6107 struct objfile *objfile = dwarf2_per_objfile->objfile;
6108 struct dwarf2_cu *cu = reader->cu;
6109 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6110 struct signatured_type *sig_type;
6111 struct type_unit_group *tu_group;
6112 struct attribute *attr;
6113 struct partial_die_info *first_die;
6114 CORE_ADDR lowpc, highpc;
6115 struct partial_symtab *pst;
6117 gdb_assert (data == NULL);
6118 gdb_assert (per_cu->is_debug_types);
6119 sig_type = (struct signatured_type *) per_cu;
6124 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6125 tu_group = get_type_unit_group (cu, attr);
6127 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6129 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6130 cu->list_in_scope = &file_symbols;
6131 pst = create_partial_symtab (per_cu, "");
6134 first_die = load_partial_dies (reader, info_ptr, 1);
6136 lowpc = (CORE_ADDR) -1;
6137 highpc = (CORE_ADDR) 0;
6138 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6140 pst->n_global_syms = objfile->global_psymbols.next -
6141 (objfile->global_psymbols.list + pst->globals_offset);
6142 pst->n_static_syms = objfile->static_psymbols.next -
6143 (objfile->static_psymbols.list + pst->statics_offset);
6144 sort_pst_symbols (objfile, pst);
6147 /* Traversal function for build_type_psymtabs. */
6150 build_type_psymtab_dependencies (void **slot, void *info)
6152 struct objfile *objfile = dwarf2_per_objfile->objfile;
6153 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6154 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6155 struct partial_symtab *pst = per_cu->v.psymtab;
6156 int len = VEC_length (sig_type_ptr, tu_group->tus);
6157 struct signatured_type *iter;
6160 gdb_assert (len > 0);
6161 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6163 pst->number_of_dependencies = len;
6164 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
6165 len * sizeof (struct psymtab *));
6167 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6170 gdb_assert (iter->per_cu.is_debug_types);
6171 pst->dependencies[i] = iter->per_cu.v.psymtab;
6172 iter->type_unit_group = tu_group;
6175 VEC_free (sig_type_ptr, tu_group->tus);
6180 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6181 Build partial symbol tables for the .debug_types comp-units. */
6184 build_type_psymtabs (struct objfile *objfile)
6186 if (! create_all_type_units (objfile))
6189 build_type_unit_groups (build_type_psymtabs_reader, NULL);
6191 /* Now that all TUs have been processed we can fill in the dependencies. */
6192 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6193 build_type_psymtab_dependencies, NULL);
6196 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6199 psymtabs_addrmap_cleanup (void *o)
6201 struct objfile *objfile = o;
6203 objfile->psymtabs_addrmap = NULL;
6206 /* Compute the 'user' field for each psymtab in OBJFILE. */
6209 set_partial_user (struct objfile *objfile)
6213 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6215 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6216 struct partial_symtab *pst = per_cu->v.psymtab;
6222 for (j = 0; j < pst->number_of_dependencies; ++j)
6224 /* Set the 'user' field only if it is not already set. */
6225 if (pst->dependencies[j]->user == NULL)
6226 pst->dependencies[j]->user = pst;
6231 /* Build the partial symbol table by doing a quick pass through the
6232 .debug_info and .debug_abbrev sections. */
6235 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6237 struct cleanup *back_to, *addrmap_cleanup;
6238 struct obstack temp_obstack;
6241 if (dwarf2_read_debug)
6243 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6244 objfile_name (objfile));
6247 dwarf2_per_objfile->reading_partial_symbols = 1;
6249 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6251 /* Any cached compilation units will be linked by the per-objfile
6252 read_in_chain. Make sure to free them when we're done. */
6253 back_to = make_cleanup (free_cached_comp_units, NULL);
6255 build_type_psymtabs (objfile);
6257 create_all_comp_units (objfile);
6259 /* Create a temporary address map on a temporary obstack. We later
6260 copy this to the final obstack. */
6261 obstack_init (&temp_obstack);
6262 make_cleanup_obstack_free (&temp_obstack);
6263 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6264 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6266 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6268 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6270 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6273 set_partial_user (objfile);
6275 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6276 &objfile->objfile_obstack);
6277 discard_cleanups (addrmap_cleanup);
6279 do_cleanups (back_to);
6281 if (dwarf2_read_debug)
6282 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6283 objfile_name (objfile));
6286 /* die_reader_func for load_partial_comp_unit. */
6289 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6290 const gdb_byte *info_ptr,
6291 struct die_info *comp_unit_die,
6295 struct dwarf2_cu *cu = reader->cu;
6297 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6299 /* Check if comp unit has_children.
6300 If so, read the rest of the partial symbols from this comp unit.
6301 If not, there's no more debug_info for this comp unit. */
6303 load_partial_dies (reader, info_ptr, 0);
6306 /* Load the partial DIEs for a secondary CU into memory.
6307 This is also used when rereading a primary CU with load_all_dies. */
6310 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6312 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6313 load_partial_comp_unit_reader, NULL);
6317 read_comp_units_from_section (struct objfile *objfile,
6318 struct dwarf2_section_info *section,
6319 unsigned int is_dwz,
6322 struct dwarf2_per_cu_data ***all_comp_units)
6324 const gdb_byte *info_ptr;
6325 bfd *abfd = get_section_bfd_owner (section);
6327 if (dwarf2_read_debug)
6328 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6329 get_section_name (section),
6330 get_section_file_name (section));
6332 dwarf2_read_section (objfile, section);
6334 info_ptr = section->buffer;
6336 while (info_ptr < section->buffer + section->size)
6338 unsigned int length, initial_length_size;
6339 struct dwarf2_per_cu_data *this_cu;
6342 offset.sect_off = info_ptr - section->buffer;
6344 /* Read just enough information to find out where the next
6345 compilation unit is. */
6346 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6348 /* Save the compilation unit for later lookup. */
6349 this_cu = obstack_alloc (&objfile->objfile_obstack,
6350 sizeof (struct dwarf2_per_cu_data));
6351 memset (this_cu, 0, sizeof (*this_cu));
6352 this_cu->offset = offset;
6353 this_cu->length = length + initial_length_size;
6354 this_cu->is_dwz = is_dwz;
6355 this_cu->objfile = objfile;
6356 this_cu->section = section;
6358 if (*n_comp_units == *n_allocated)
6361 *all_comp_units = xrealloc (*all_comp_units,
6363 * sizeof (struct dwarf2_per_cu_data *));
6365 (*all_comp_units)[*n_comp_units] = this_cu;
6368 info_ptr = info_ptr + this_cu->length;
6372 /* Create a list of all compilation units in OBJFILE.
6373 This is only done for -readnow and building partial symtabs. */
6376 create_all_comp_units (struct objfile *objfile)
6380 struct dwarf2_per_cu_data **all_comp_units;
6381 struct dwz_file *dwz;
6385 all_comp_units = xmalloc (n_allocated
6386 * sizeof (struct dwarf2_per_cu_data *));
6388 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6389 &n_allocated, &n_comp_units, &all_comp_units);
6391 dwz = dwarf2_get_dwz_file ();
6393 read_comp_units_from_section (objfile, &dwz->info, 1,
6394 &n_allocated, &n_comp_units,
6397 dwarf2_per_objfile->all_comp_units
6398 = obstack_alloc (&objfile->objfile_obstack,
6399 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6400 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6401 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6402 xfree (all_comp_units);
6403 dwarf2_per_objfile->n_comp_units = n_comp_units;
6406 /* Process all loaded DIEs for compilation unit CU, starting at
6407 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6408 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6409 DW_AT_ranges). If NEED_PC is set, then this function will set
6410 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6411 and record the covered ranges in the addrmap. */
6414 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6415 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6417 struct partial_die_info *pdi;
6419 /* Now, march along the PDI's, descending into ones which have
6420 interesting children but skipping the children of the other ones,
6421 until we reach the end of the compilation unit. */
6427 fixup_partial_die (pdi, cu);
6429 /* Anonymous namespaces or modules have no name but have interesting
6430 children, so we need to look at them. Ditto for anonymous
6433 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6434 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6435 || pdi->tag == DW_TAG_imported_unit)
6439 case DW_TAG_subprogram:
6440 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6442 case DW_TAG_constant:
6443 case DW_TAG_variable:
6444 case DW_TAG_typedef:
6445 case DW_TAG_union_type:
6446 if (!pdi->is_declaration)
6448 add_partial_symbol (pdi, cu);
6451 case DW_TAG_class_type:
6452 case DW_TAG_interface_type:
6453 case DW_TAG_structure_type:
6454 if (!pdi->is_declaration)
6456 add_partial_symbol (pdi, cu);
6459 case DW_TAG_enumeration_type:
6460 if (!pdi->is_declaration)
6461 add_partial_enumeration (pdi, cu);
6463 case DW_TAG_base_type:
6464 case DW_TAG_subrange_type:
6465 /* File scope base type definitions are added to the partial
6467 add_partial_symbol (pdi, cu);
6469 case DW_TAG_namespace:
6470 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6473 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6475 case DW_TAG_imported_unit:
6477 struct dwarf2_per_cu_data *per_cu;
6479 /* For now we don't handle imported units in type units. */
6480 if (cu->per_cu->is_debug_types)
6482 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6483 " supported in type units [in module %s]"),
6484 objfile_name (cu->objfile));
6487 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6491 /* Go read the partial unit, if needed. */
6492 if (per_cu->v.psymtab == NULL)
6493 process_psymtab_comp_unit (per_cu, 1, cu->language);
6495 VEC_safe_push (dwarf2_per_cu_ptr,
6496 cu->per_cu->imported_symtabs, per_cu);
6499 case DW_TAG_imported_declaration:
6500 add_partial_symbol (pdi, cu);
6507 /* If the die has a sibling, skip to the sibling. */
6509 pdi = pdi->die_sibling;
6513 /* Functions used to compute the fully scoped name of a partial DIE.
6515 Normally, this is simple. For C++, the parent DIE's fully scoped
6516 name is concatenated with "::" and the partial DIE's name. For
6517 Java, the same thing occurs except that "." is used instead of "::".
6518 Enumerators are an exception; they use the scope of their parent
6519 enumeration type, i.e. the name of the enumeration type is not
6520 prepended to the enumerator.
6522 There are two complexities. One is DW_AT_specification; in this
6523 case "parent" means the parent of the target of the specification,
6524 instead of the direct parent of the DIE. The other is compilers
6525 which do not emit DW_TAG_namespace; in this case we try to guess
6526 the fully qualified name of structure types from their members'
6527 linkage names. This must be done using the DIE's children rather
6528 than the children of any DW_AT_specification target. We only need
6529 to do this for structures at the top level, i.e. if the target of
6530 any DW_AT_specification (if any; otherwise the DIE itself) does not
6533 /* Compute the scope prefix associated with PDI's parent, in
6534 compilation unit CU. The result will be allocated on CU's
6535 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6536 field. NULL is returned if no prefix is necessary. */
6538 partial_die_parent_scope (struct partial_die_info *pdi,
6539 struct dwarf2_cu *cu)
6541 const char *grandparent_scope;
6542 struct partial_die_info *parent, *real_pdi;
6544 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6545 then this means the parent of the specification DIE. */
6548 while (real_pdi->has_specification)
6549 real_pdi = find_partial_die (real_pdi->spec_offset,
6550 real_pdi->spec_is_dwz, cu);
6552 parent = real_pdi->die_parent;
6556 if (parent->scope_set)
6557 return parent->scope;
6559 fixup_partial_die (parent, cu);
6561 grandparent_scope = partial_die_parent_scope (parent, cu);
6563 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6564 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6565 Work around this problem here. */
6566 if (cu->language == language_cplus
6567 && parent->tag == DW_TAG_namespace
6568 && strcmp (parent->name, "::") == 0
6569 && grandparent_scope == NULL)
6571 parent->scope = NULL;
6572 parent->scope_set = 1;
6576 if (pdi->tag == DW_TAG_enumerator)
6577 /* Enumerators should not get the name of the enumeration as a prefix. */
6578 parent->scope = grandparent_scope;
6579 else if (parent->tag == DW_TAG_namespace
6580 || parent->tag == DW_TAG_module
6581 || parent->tag == DW_TAG_structure_type
6582 || parent->tag == DW_TAG_class_type
6583 || parent->tag == DW_TAG_interface_type
6584 || parent->tag == DW_TAG_union_type
6585 || parent->tag == DW_TAG_enumeration_type)
6587 if (grandparent_scope == NULL)
6588 parent->scope = parent->name;
6590 parent->scope = typename_concat (&cu->comp_unit_obstack,
6592 parent->name, 0, cu);
6596 /* FIXME drow/2004-04-01: What should we be doing with
6597 function-local names? For partial symbols, we should probably be
6599 complaint (&symfile_complaints,
6600 _("unhandled containing DIE tag %d for DIE at %d"),
6601 parent->tag, pdi->offset.sect_off);
6602 parent->scope = grandparent_scope;
6605 parent->scope_set = 1;
6606 return parent->scope;
6609 /* Return the fully scoped name associated with PDI, from compilation unit
6610 CU. The result will be allocated with malloc. */
6613 partial_die_full_name (struct partial_die_info *pdi,
6614 struct dwarf2_cu *cu)
6616 const char *parent_scope;
6618 /* If this is a template instantiation, we can not work out the
6619 template arguments from partial DIEs. So, unfortunately, we have
6620 to go through the full DIEs. At least any work we do building
6621 types here will be reused if full symbols are loaded later. */
6622 if (pdi->has_template_arguments)
6624 fixup_partial_die (pdi, cu);
6626 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6628 struct die_info *die;
6629 struct attribute attr;
6630 struct dwarf2_cu *ref_cu = cu;
6632 /* DW_FORM_ref_addr is using section offset. */
6634 attr.form = DW_FORM_ref_addr;
6635 attr.u.unsnd = pdi->offset.sect_off;
6636 die = follow_die_ref (NULL, &attr, &ref_cu);
6638 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6642 parent_scope = partial_die_parent_scope (pdi, cu);
6643 if (parent_scope == NULL)
6646 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6650 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6652 struct objfile *objfile = cu->objfile;
6654 const char *actual_name = NULL;
6656 char *built_actual_name;
6658 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6660 built_actual_name = partial_die_full_name (pdi, cu);
6661 if (built_actual_name != NULL)
6662 actual_name = built_actual_name;
6664 if (actual_name == NULL)
6665 actual_name = pdi->name;
6669 case DW_TAG_subprogram:
6670 if (pdi->is_external || cu->language == language_ada)
6672 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6673 of the global scope. But in Ada, we want to be able to access
6674 nested procedures globally. So all Ada subprograms are stored
6675 in the global scope. */
6676 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6677 mst_text, objfile); */
6678 add_psymbol_to_list (actual_name, strlen (actual_name),
6679 built_actual_name != NULL,
6680 VAR_DOMAIN, LOC_BLOCK,
6681 &objfile->global_psymbols,
6682 0, pdi->lowpc + baseaddr,
6683 cu->language, objfile);
6687 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6688 mst_file_text, objfile); */
6689 add_psymbol_to_list (actual_name, strlen (actual_name),
6690 built_actual_name != NULL,
6691 VAR_DOMAIN, LOC_BLOCK,
6692 &objfile->static_psymbols,
6693 0, pdi->lowpc + baseaddr,
6694 cu->language, objfile);
6697 case DW_TAG_constant:
6699 struct psymbol_allocation_list *list;
6701 if (pdi->is_external)
6702 list = &objfile->global_psymbols;
6704 list = &objfile->static_psymbols;
6705 add_psymbol_to_list (actual_name, strlen (actual_name),
6706 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6707 list, 0, 0, cu->language, objfile);
6710 case DW_TAG_variable:
6712 addr = decode_locdesc (pdi->d.locdesc, cu);
6716 && !dwarf2_per_objfile->has_section_at_zero)
6718 /* A global or static variable may also have been stripped
6719 out by the linker if unused, in which case its address
6720 will be nullified; do not add such variables into partial
6721 symbol table then. */
6723 else if (pdi->is_external)
6726 Don't enter into the minimal symbol tables as there is
6727 a minimal symbol table entry from the ELF symbols already.
6728 Enter into partial symbol table if it has a location
6729 descriptor or a type.
6730 If the location descriptor is missing, new_symbol will create
6731 a LOC_UNRESOLVED symbol, the address of the variable will then
6732 be determined from the minimal symbol table whenever the variable
6734 The address for the partial symbol table entry is not
6735 used by GDB, but it comes in handy for debugging partial symbol
6738 if (pdi->d.locdesc || pdi->has_type)
6739 add_psymbol_to_list (actual_name, strlen (actual_name),
6740 built_actual_name != NULL,
6741 VAR_DOMAIN, LOC_STATIC,
6742 &objfile->global_psymbols,
6744 cu->language, objfile);
6748 /* Static Variable. Skip symbols without location descriptors. */
6749 if (pdi->d.locdesc == NULL)
6751 xfree (built_actual_name);
6754 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6755 mst_file_data, objfile); */
6756 add_psymbol_to_list (actual_name, strlen (actual_name),
6757 built_actual_name != NULL,
6758 VAR_DOMAIN, LOC_STATIC,
6759 &objfile->static_psymbols,
6761 cu->language, objfile);
6764 case DW_TAG_typedef:
6765 case DW_TAG_base_type:
6766 case DW_TAG_subrange_type:
6767 add_psymbol_to_list (actual_name, strlen (actual_name),
6768 built_actual_name != NULL,
6769 VAR_DOMAIN, LOC_TYPEDEF,
6770 &objfile->static_psymbols,
6771 0, (CORE_ADDR) 0, cu->language, objfile);
6773 case DW_TAG_imported_declaration:
6774 case DW_TAG_namespace:
6775 add_psymbol_to_list (actual_name, strlen (actual_name),
6776 built_actual_name != NULL,
6777 VAR_DOMAIN, LOC_TYPEDEF,
6778 &objfile->global_psymbols,
6779 0, (CORE_ADDR) 0, cu->language, objfile);
6782 add_psymbol_to_list (actual_name, strlen (actual_name),
6783 built_actual_name != NULL,
6784 MODULE_DOMAIN, LOC_TYPEDEF,
6785 &objfile->global_psymbols,
6786 0, (CORE_ADDR) 0, cu->language, objfile);
6788 case DW_TAG_class_type:
6789 case DW_TAG_interface_type:
6790 case DW_TAG_structure_type:
6791 case DW_TAG_union_type:
6792 case DW_TAG_enumeration_type:
6793 /* Skip external references. The DWARF standard says in the section
6794 about "Structure, Union, and Class Type Entries": "An incomplete
6795 structure, union or class type is represented by a structure,
6796 union or class entry that does not have a byte size attribute
6797 and that has a DW_AT_declaration attribute." */
6798 if (!pdi->has_byte_size && pdi->is_declaration)
6800 xfree (built_actual_name);
6804 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6805 static vs. global. */
6806 add_psymbol_to_list (actual_name, strlen (actual_name),
6807 built_actual_name != NULL,
6808 STRUCT_DOMAIN, LOC_TYPEDEF,
6809 (cu->language == language_cplus
6810 || cu->language == language_java)
6811 ? &objfile->global_psymbols
6812 : &objfile->static_psymbols,
6813 0, (CORE_ADDR) 0, cu->language, objfile);
6816 case DW_TAG_enumerator:
6817 add_psymbol_to_list (actual_name, strlen (actual_name),
6818 built_actual_name != NULL,
6819 VAR_DOMAIN, LOC_CONST,
6820 (cu->language == language_cplus
6821 || cu->language == language_java)
6822 ? &objfile->global_psymbols
6823 : &objfile->static_psymbols,
6824 0, (CORE_ADDR) 0, cu->language, objfile);
6830 xfree (built_actual_name);
6833 /* Read a partial die corresponding to a namespace; also, add a symbol
6834 corresponding to that namespace to the symbol table. NAMESPACE is
6835 the name of the enclosing namespace. */
6838 add_partial_namespace (struct partial_die_info *pdi,
6839 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6840 int need_pc, struct dwarf2_cu *cu)
6842 /* Add a symbol for the namespace. */
6844 add_partial_symbol (pdi, cu);
6846 /* Now scan partial symbols in that namespace. */
6848 if (pdi->has_children)
6849 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6852 /* Read a partial die corresponding to a Fortran module. */
6855 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6856 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6858 /* Add a symbol for the namespace. */
6860 add_partial_symbol (pdi, cu);
6862 /* Now scan partial symbols in that module. */
6864 if (pdi->has_children)
6865 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6868 /* Read a partial die corresponding to a subprogram and create a partial
6869 symbol for that subprogram. When the CU language allows it, this
6870 routine also defines a partial symbol for each nested subprogram
6871 that this subprogram contains.
6873 DIE my also be a lexical block, in which case we simply search
6874 recursively for suprograms defined inside that lexical block.
6875 Again, this is only performed when the CU language allows this
6876 type of definitions. */
6879 add_partial_subprogram (struct partial_die_info *pdi,
6880 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6881 int need_pc, struct dwarf2_cu *cu)
6883 if (pdi->tag == DW_TAG_subprogram)
6885 if (pdi->has_pc_info)
6887 if (pdi->lowpc < *lowpc)
6888 *lowpc = pdi->lowpc;
6889 if (pdi->highpc > *highpc)
6890 *highpc = pdi->highpc;
6894 struct objfile *objfile = cu->objfile;
6896 baseaddr = ANOFFSET (objfile->section_offsets,
6897 SECT_OFF_TEXT (objfile));
6898 addrmap_set_empty (objfile->psymtabs_addrmap,
6899 pdi->lowpc + baseaddr,
6900 pdi->highpc - 1 + baseaddr,
6901 cu->per_cu->v.psymtab);
6905 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6907 if (!pdi->is_declaration)
6908 /* Ignore subprogram DIEs that do not have a name, they are
6909 illegal. Do not emit a complaint at this point, we will
6910 do so when we convert this psymtab into a symtab. */
6912 add_partial_symbol (pdi, cu);
6916 if (! pdi->has_children)
6919 if (cu->language == language_ada)
6921 pdi = pdi->die_child;
6924 fixup_partial_die (pdi, cu);
6925 if (pdi->tag == DW_TAG_subprogram
6926 || pdi->tag == DW_TAG_lexical_block)
6927 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6928 pdi = pdi->die_sibling;
6933 /* Read a partial die corresponding to an enumeration type. */
6936 add_partial_enumeration (struct partial_die_info *enum_pdi,
6937 struct dwarf2_cu *cu)
6939 struct partial_die_info *pdi;
6941 if (enum_pdi->name != NULL)
6942 add_partial_symbol (enum_pdi, cu);
6944 pdi = enum_pdi->die_child;
6947 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6948 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6950 add_partial_symbol (pdi, cu);
6951 pdi = pdi->die_sibling;
6955 /* Return the initial uleb128 in the die at INFO_PTR. */
6958 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6960 unsigned int bytes_read;
6962 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6965 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6966 Return the corresponding abbrev, or NULL if the number is zero (indicating
6967 an empty DIE). In either case *BYTES_READ will be set to the length of
6968 the initial number. */
6970 static struct abbrev_info *
6971 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6972 struct dwarf2_cu *cu)
6974 bfd *abfd = cu->objfile->obfd;
6975 unsigned int abbrev_number;
6976 struct abbrev_info *abbrev;
6978 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6980 if (abbrev_number == 0)
6983 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6986 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6987 abbrev_number, bfd_get_filename (abfd));
6993 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6994 Returns a pointer to the end of a series of DIEs, terminated by an empty
6995 DIE. Any children of the skipped DIEs will also be skipped. */
6997 static const gdb_byte *
6998 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7000 struct dwarf2_cu *cu = reader->cu;
7001 struct abbrev_info *abbrev;
7002 unsigned int bytes_read;
7006 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7008 return info_ptr + bytes_read;
7010 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7014 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7015 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7016 abbrev corresponding to that skipped uleb128 should be passed in
7017 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7020 static const gdb_byte *
7021 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7022 struct abbrev_info *abbrev)
7024 unsigned int bytes_read;
7025 struct attribute attr;
7026 bfd *abfd = reader->abfd;
7027 struct dwarf2_cu *cu = reader->cu;
7028 const gdb_byte *buffer = reader->buffer;
7029 const gdb_byte *buffer_end = reader->buffer_end;
7030 const gdb_byte *start_info_ptr = info_ptr;
7031 unsigned int form, i;
7033 for (i = 0; i < abbrev->num_attrs; i++)
7035 /* The only abbrev we care about is DW_AT_sibling. */
7036 if (abbrev->attrs[i].name == DW_AT_sibling)
7038 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7039 if (attr.form == DW_FORM_ref_addr)
7040 complaint (&symfile_complaints,
7041 _("ignoring absolute DW_AT_sibling"));
7044 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
7045 const gdb_byte *sibling_ptr = buffer + off;
7047 if (sibling_ptr < info_ptr)
7048 complaint (&symfile_complaints,
7049 _("DW_AT_sibling points backwards"));
7050 else if (sibling_ptr > reader->buffer_end)
7051 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7057 /* If it isn't DW_AT_sibling, skip this attribute. */
7058 form = abbrev->attrs[i].form;
7062 case DW_FORM_ref_addr:
7063 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7064 and later it is offset sized. */
7065 if (cu->header.version == 2)
7066 info_ptr += cu->header.addr_size;
7068 info_ptr += cu->header.offset_size;
7070 case DW_FORM_GNU_ref_alt:
7071 info_ptr += cu->header.offset_size;
7074 info_ptr += cu->header.addr_size;
7081 case DW_FORM_flag_present:
7093 case DW_FORM_ref_sig8:
7096 case DW_FORM_string:
7097 read_direct_string (abfd, info_ptr, &bytes_read);
7098 info_ptr += bytes_read;
7100 case DW_FORM_sec_offset:
7102 case DW_FORM_GNU_strp_alt:
7103 info_ptr += cu->header.offset_size;
7105 case DW_FORM_exprloc:
7107 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7108 info_ptr += bytes_read;
7110 case DW_FORM_block1:
7111 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7113 case DW_FORM_block2:
7114 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7116 case DW_FORM_block4:
7117 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7121 case DW_FORM_ref_udata:
7122 case DW_FORM_GNU_addr_index:
7123 case DW_FORM_GNU_str_index:
7124 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7126 case DW_FORM_indirect:
7127 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7128 info_ptr += bytes_read;
7129 /* We need to continue parsing from here, so just go back to
7131 goto skip_attribute;
7134 error (_("Dwarf Error: Cannot handle %s "
7135 "in DWARF reader [in module %s]"),
7136 dwarf_form_name (form),
7137 bfd_get_filename (abfd));
7141 if (abbrev->has_children)
7142 return skip_children (reader, info_ptr);
7147 /* Locate ORIG_PDI's sibling.
7148 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7150 static const gdb_byte *
7151 locate_pdi_sibling (const struct die_reader_specs *reader,
7152 struct partial_die_info *orig_pdi,
7153 const gdb_byte *info_ptr)
7155 /* Do we know the sibling already? */
7157 if (orig_pdi->sibling)
7158 return orig_pdi->sibling;
7160 /* Are there any children to deal with? */
7162 if (!orig_pdi->has_children)
7165 /* Skip the children the long way. */
7167 return skip_children (reader, info_ptr);
7170 /* Expand this partial symbol table into a full symbol table. SELF is
7174 dwarf2_read_symtab (struct partial_symtab *self,
7175 struct objfile *objfile)
7179 warning (_("bug: psymtab for %s is already read in."),
7186 printf_filtered (_("Reading in symbols for %s..."),
7188 gdb_flush (gdb_stdout);
7191 /* Restore our global data. */
7192 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
7194 /* If this psymtab is constructed from a debug-only objfile, the
7195 has_section_at_zero flag will not necessarily be correct. We
7196 can get the correct value for this flag by looking at the data
7197 associated with the (presumably stripped) associated objfile. */
7198 if (objfile->separate_debug_objfile_backlink)
7200 struct dwarf2_per_objfile *dpo_backlink
7201 = objfile_data (objfile->separate_debug_objfile_backlink,
7202 dwarf2_objfile_data_key);
7204 dwarf2_per_objfile->has_section_at_zero
7205 = dpo_backlink->has_section_at_zero;
7208 dwarf2_per_objfile->reading_partial_symbols = 0;
7210 psymtab_to_symtab_1 (self);
7212 /* Finish up the debug error message. */
7214 printf_filtered (_("done.\n"));
7217 process_cu_includes ();
7220 /* Reading in full CUs. */
7222 /* Add PER_CU to the queue. */
7225 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7226 enum language pretend_language)
7228 struct dwarf2_queue_item *item;
7231 item = xmalloc (sizeof (*item));
7232 item->per_cu = per_cu;
7233 item->pretend_language = pretend_language;
7236 if (dwarf2_queue == NULL)
7237 dwarf2_queue = item;
7239 dwarf2_queue_tail->next = item;
7241 dwarf2_queue_tail = item;
7244 /* If PER_CU is not yet queued, add it to the queue.
7245 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7247 The result is non-zero if PER_CU was queued, otherwise the result is zero
7248 meaning either PER_CU is already queued or it is already loaded.
7250 N.B. There is an invariant here that if a CU is queued then it is loaded.
7251 The caller is required to load PER_CU if we return non-zero. */
7254 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7255 struct dwarf2_per_cu_data *per_cu,
7256 enum language pretend_language)
7258 /* We may arrive here during partial symbol reading, if we need full
7259 DIEs to process an unusual case (e.g. template arguments). Do
7260 not queue PER_CU, just tell our caller to load its DIEs. */
7261 if (dwarf2_per_objfile->reading_partial_symbols)
7263 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7268 /* Mark the dependence relation so that we don't flush PER_CU
7270 if (dependent_cu != NULL)
7271 dwarf2_add_dependence (dependent_cu, per_cu);
7273 /* If it's already on the queue, we have nothing to do. */
7277 /* If the compilation unit is already loaded, just mark it as
7279 if (per_cu->cu != NULL)
7281 per_cu->cu->last_used = 0;
7285 /* Add it to the queue. */
7286 queue_comp_unit (per_cu, pretend_language);
7291 /* Process the queue. */
7294 process_queue (void)
7296 struct dwarf2_queue_item *item, *next_item;
7298 if (dwarf2_read_debug)
7300 fprintf_unfiltered (gdb_stdlog,
7301 "Expanding one or more symtabs of objfile %s ...\n",
7302 objfile_name (dwarf2_per_objfile->objfile));
7305 /* The queue starts out with one item, but following a DIE reference
7306 may load a new CU, adding it to the end of the queue. */
7307 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7309 if (dwarf2_per_objfile->using_index
7310 ? !item->per_cu->v.quick->symtab
7311 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7313 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7314 unsigned int debug_print_threshold;
7317 if (per_cu->is_debug_types)
7319 struct signatured_type *sig_type =
7320 (struct signatured_type *) per_cu;
7322 sprintf (buf, "TU %s at offset 0x%x",
7323 hex_string (sig_type->signature),
7324 per_cu->offset.sect_off);
7325 /* There can be 100s of TUs.
7326 Only print them in verbose mode. */
7327 debug_print_threshold = 2;
7331 sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off);
7332 debug_print_threshold = 1;
7335 if (dwarf2_read_debug >= debug_print_threshold)
7336 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7338 if (per_cu->is_debug_types)
7339 process_full_type_unit (per_cu, item->pretend_language);
7341 process_full_comp_unit (per_cu, item->pretend_language);
7343 if (dwarf2_read_debug >= debug_print_threshold)
7344 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7347 item->per_cu->queued = 0;
7348 next_item = item->next;
7352 dwarf2_queue_tail = NULL;
7354 if (dwarf2_read_debug)
7356 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7357 objfile_name (dwarf2_per_objfile->objfile));
7361 /* Free all allocated queue entries. This function only releases anything if
7362 an error was thrown; if the queue was processed then it would have been
7363 freed as we went along. */
7366 dwarf2_release_queue (void *dummy)
7368 struct dwarf2_queue_item *item, *last;
7370 item = dwarf2_queue;
7373 /* Anything still marked queued is likely to be in an
7374 inconsistent state, so discard it. */
7375 if (item->per_cu->queued)
7377 if (item->per_cu->cu != NULL)
7378 free_one_cached_comp_unit (item->per_cu);
7379 item->per_cu->queued = 0;
7387 dwarf2_queue = dwarf2_queue_tail = NULL;
7390 /* Read in full symbols for PST, and anything it depends on. */
7393 psymtab_to_symtab_1 (struct partial_symtab *pst)
7395 struct dwarf2_per_cu_data *per_cu;
7401 for (i = 0; i < pst->number_of_dependencies; i++)
7402 if (!pst->dependencies[i]->readin
7403 && pst->dependencies[i]->user == NULL)
7405 /* Inform about additional files that need to be read in. */
7408 /* FIXME: i18n: Need to make this a single string. */
7409 fputs_filtered (" ", gdb_stdout);
7411 fputs_filtered ("and ", gdb_stdout);
7413 printf_filtered ("%s...", pst->dependencies[i]->filename);
7414 wrap_here (""); /* Flush output. */
7415 gdb_flush (gdb_stdout);
7417 psymtab_to_symtab_1 (pst->dependencies[i]);
7420 per_cu = pst->read_symtab_private;
7424 /* It's an include file, no symbols to read for it.
7425 Everything is in the parent symtab. */
7430 dw2_do_instantiate_symtab (per_cu);
7433 /* Trivial hash function for die_info: the hash value of a DIE
7434 is its offset in .debug_info for this objfile. */
7437 die_hash (const void *item)
7439 const struct die_info *die = item;
7441 return die->offset.sect_off;
7444 /* Trivial comparison function for die_info structures: two DIEs
7445 are equal if they have the same offset. */
7448 die_eq (const void *item_lhs, const void *item_rhs)
7450 const struct die_info *die_lhs = item_lhs;
7451 const struct die_info *die_rhs = item_rhs;
7453 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7456 /* die_reader_func for load_full_comp_unit.
7457 This is identical to read_signatured_type_reader,
7458 but is kept separate for now. */
7461 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7462 const gdb_byte *info_ptr,
7463 struct die_info *comp_unit_die,
7467 struct dwarf2_cu *cu = reader->cu;
7468 enum language *language_ptr = data;
7470 gdb_assert (cu->die_hash == NULL);
7472 htab_create_alloc_ex (cu->header.length / 12,
7476 &cu->comp_unit_obstack,
7477 hashtab_obstack_allocate,
7478 dummy_obstack_deallocate);
7481 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7482 &info_ptr, comp_unit_die);
7483 cu->dies = comp_unit_die;
7484 /* comp_unit_die is not stored in die_hash, no need. */
7486 /* We try not to read any attributes in this function, because not
7487 all CUs needed for references have been loaded yet, and symbol
7488 table processing isn't initialized. But we have to set the CU language,
7489 or we won't be able to build types correctly.
7490 Similarly, if we do not read the producer, we can not apply
7491 producer-specific interpretation. */
7492 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7495 /* Load the DIEs associated with PER_CU into memory. */
7498 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7499 enum language pretend_language)
7501 gdb_assert (! this_cu->is_debug_types);
7503 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7504 load_full_comp_unit_reader, &pretend_language);
7507 /* Add a DIE to the delayed physname list. */
7510 add_to_method_list (struct type *type, int fnfield_index, int index,
7511 const char *name, struct die_info *die,
7512 struct dwarf2_cu *cu)
7514 struct delayed_method_info mi;
7516 mi.fnfield_index = fnfield_index;
7520 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7523 /* A cleanup for freeing the delayed method list. */
7526 free_delayed_list (void *ptr)
7528 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7529 if (cu->method_list != NULL)
7531 VEC_free (delayed_method_info, cu->method_list);
7532 cu->method_list = NULL;
7536 /* Compute the physnames of any methods on the CU's method list.
7538 The computation of method physnames is delayed in order to avoid the
7539 (bad) condition that one of the method's formal parameters is of an as yet
7543 compute_delayed_physnames (struct dwarf2_cu *cu)
7546 struct delayed_method_info *mi;
7547 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7549 const char *physname;
7550 struct fn_fieldlist *fn_flp
7551 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7552 physname = dwarf2_physname (mi->name, mi->die, cu);
7553 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7557 /* Go objects should be embedded in a DW_TAG_module DIE,
7558 and it's not clear if/how imported objects will appear.
7559 To keep Go support simple until that's worked out,
7560 go back through what we've read and create something usable.
7561 We could do this while processing each DIE, and feels kinda cleaner,
7562 but that way is more invasive.
7563 This is to, for example, allow the user to type "p var" or "b main"
7564 without having to specify the package name, and allow lookups
7565 of module.object to work in contexts that use the expression
7569 fixup_go_packaging (struct dwarf2_cu *cu)
7571 char *package_name = NULL;
7572 struct pending *list;
7575 for (list = global_symbols; list != NULL; list = list->next)
7577 for (i = 0; i < list->nsyms; ++i)
7579 struct symbol *sym = list->symbol[i];
7581 if (SYMBOL_LANGUAGE (sym) == language_go
7582 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7584 char *this_package_name = go_symbol_package_name (sym);
7586 if (this_package_name == NULL)
7588 if (package_name == NULL)
7589 package_name = this_package_name;
7592 if (strcmp (package_name, this_package_name) != 0)
7593 complaint (&symfile_complaints,
7594 _("Symtab %s has objects from two different Go packages: %s and %s"),
7595 (SYMBOL_SYMTAB (sym)
7596 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7597 : objfile_name (cu->objfile)),
7598 this_package_name, package_name);
7599 xfree (this_package_name);
7605 if (package_name != NULL)
7607 struct objfile *objfile = cu->objfile;
7608 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7610 strlen (package_name));
7611 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7612 saved_package_name, objfile);
7615 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7617 sym = allocate_symbol (objfile);
7618 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7619 SYMBOL_SET_NAMES (sym, saved_package_name,
7620 strlen (saved_package_name), 0, objfile);
7621 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7622 e.g., "main" finds the "main" module and not C's main(). */
7623 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7624 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7625 SYMBOL_TYPE (sym) = type;
7627 add_symbol_to_list (sym, &global_symbols);
7629 xfree (package_name);
7633 /* Return the symtab for PER_CU. This works properly regardless of
7634 whether we're using the index or psymtabs. */
7636 static struct symtab *
7637 get_symtab (struct dwarf2_per_cu_data *per_cu)
7639 return (dwarf2_per_objfile->using_index
7640 ? per_cu->v.quick->symtab
7641 : per_cu->v.psymtab->symtab);
7644 /* A helper function for computing the list of all symbol tables
7645 included by PER_CU. */
7648 recursively_compute_inclusions (VEC (symtab_ptr) **result,
7649 htab_t all_children, htab_t all_type_symtabs,
7650 struct dwarf2_per_cu_data *per_cu,
7651 struct symtab *immediate_parent)
7655 struct symtab *symtab;
7656 struct dwarf2_per_cu_data *iter;
7658 slot = htab_find_slot (all_children, per_cu, INSERT);
7661 /* This inclusion and its children have been processed. */
7666 /* Only add a CU if it has a symbol table. */
7667 symtab = get_symtab (per_cu);
7670 /* If this is a type unit only add its symbol table if we haven't
7671 seen it yet (type unit per_cu's can share symtabs). */
7672 if (per_cu->is_debug_types)
7674 slot = htab_find_slot (all_type_symtabs, symtab, INSERT);
7678 VEC_safe_push (symtab_ptr, *result, symtab);
7679 if (symtab->user == NULL)
7680 symtab->user = immediate_parent;
7685 VEC_safe_push (symtab_ptr, *result, symtab);
7686 if (symtab->user == NULL)
7687 symtab->user = immediate_parent;
7692 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7695 recursively_compute_inclusions (result, all_children,
7696 all_type_symtabs, iter, symtab);
7700 /* Compute the symtab 'includes' fields for the symtab related to
7704 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7706 gdb_assert (! per_cu->is_debug_types);
7708 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7711 struct dwarf2_per_cu_data *per_cu_iter;
7712 struct symtab *symtab_iter;
7713 VEC (symtab_ptr) *result_symtabs = NULL;
7714 htab_t all_children, all_type_symtabs;
7715 struct symtab *symtab = get_symtab (per_cu);
7717 /* If we don't have a symtab, we can just skip this case. */
7721 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7722 NULL, xcalloc, xfree);
7723 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7724 NULL, xcalloc, xfree);
7727 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7731 recursively_compute_inclusions (&result_symtabs, all_children,
7732 all_type_symtabs, per_cu_iter,
7736 /* Now we have a transitive closure of all the included symtabs. */
7737 len = VEC_length (symtab_ptr, result_symtabs);
7739 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7740 (len + 1) * sizeof (struct symtab *));
7742 VEC_iterate (symtab_ptr, result_symtabs, ix, symtab_iter);
7744 symtab->includes[ix] = symtab_iter;
7745 symtab->includes[len] = NULL;
7747 VEC_free (symtab_ptr, result_symtabs);
7748 htab_delete (all_children);
7749 htab_delete (all_type_symtabs);
7753 /* Compute the 'includes' field for the symtabs of all the CUs we just
7757 process_cu_includes (void)
7760 struct dwarf2_per_cu_data *iter;
7763 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7767 if (! iter->is_debug_types)
7768 compute_symtab_includes (iter);
7771 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7774 /* Generate full symbol information for PER_CU, whose DIEs have
7775 already been loaded into memory. */
7778 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7779 enum language pretend_language)
7781 struct dwarf2_cu *cu = per_cu->cu;
7782 struct objfile *objfile = per_cu->objfile;
7783 CORE_ADDR lowpc, highpc;
7784 struct symtab *symtab;
7785 struct cleanup *back_to, *delayed_list_cleanup;
7787 struct block *static_block;
7789 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7792 back_to = make_cleanup (really_free_pendings, NULL);
7793 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7795 cu->list_in_scope = &file_symbols;
7797 cu->language = pretend_language;
7798 cu->language_defn = language_def (cu->language);
7800 /* Do line number decoding in read_file_scope () */
7801 process_die (cu->dies, cu);
7803 /* For now fudge the Go package. */
7804 if (cu->language == language_go)
7805 fixup_go_packaging (cu);
7807 /* Now that we have processed all the DIEs in the CU, all the types
7808 should be complete, and it should now be safe to compute all of the
7810 compute_delayed_physnames (cu);
7811 do_cleanups (delayed_list_cleanup);
7813 /* Some compilers don't define a DW_AT_high_pc attribute for the
7814 compilation unit. If the DW_AT_high_pc is missing, synthesize
7815 it, by scanning the DIE's below the compilation unit. */
7816 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7819 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7821 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7822 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7823 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7824 addrmap to help ensure it has an accurate map of pc values belonging to
7826 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7828 symtab = end_symtab_from_static_block (static_block, objfile,
7829 SECT_OFF_TEXT (objfile), 0);
7833 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7835 /* Set symtab language to language from DW_AT_language. If the
7836 compilation is from a C file generated by language preprocessors, do
7837 not set the language if it was already deduced by start_subfile. */
7838 if (!(cu->language == language_c && symtab->language != language_c))
7839 symtab->language = cu->language;
7841 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7842 produce DW_AT_location with location lists but it can be possibly
7843 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7844 there were bugs in prologue debug info, fixed later in GCC-4.5
7845 by "unwind info for epilogues" patch (which is not directly related).
7847 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7848 needed, it would be wrong due to missing DW_AT_producer there.
7850 Still one can confuse GDB by using non-standard GCC compilation
7851 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7853 if (cu->has_loclist && gcc_4_minor >= 5)
7854 symtab->locations_valid = 1;
7856 if (gcc_4_minor >= 5)
7857 symtab->epilogue_unwind_valid = 1;
7859 symtab->call_site_htab = cu->call_site_htab;
7862 if (dwarf2_per_objfile->using_index)
7863 per_cu->v.quick->symtab = symtab;
7866 struct partial_symtab *pst = per_cu->v.psymtab;
7867 pst->symtab = symtab;
7871 /* Push it for inclusion processing later. */
7872 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7874 do_cleanups (back_to);
7877 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7878 already been loaded into memory. */
7881 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7882 enum language pretend_language)
7884 struct dwarf2_cu *cu = per_cu->cu;
7885 struct objfile *objfile = per_cu->objfile;
7886 struct symtab *symtab;
7887 struct cleanup *back_to, *delayed_list_cleanup;
7888 struct signatured_type *sig_type;
7890 gdb_assert (per_cu->is_debug_types);
7891 sig_type = (struct signatured_type *) per_cu;
7894 back_to = make_cleanup (really_free_pendings, NULL);
7895 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7897 cu->list_in_scope = &file_symbols;
7899 cu->language = pretend_language;
7900 cu->language_defn = language_def (cu->language);
7902 /* The symbol tables are set up in read_type_unit_scope. */
7903 process_die (cu->dies, cu);
7905 /* For now fudge the Go package. */
7906 if (cu->language == language_go)
7907 fixup_go_packaging (cu);
7909 /* Now that we have processed all the DIEs in the CU, all the types
7910 should be complete, and it should now be safe to compute all of the
7912 compute_delayed_physnames (cu);
7913 do_cleanups (delayed_list_cleanup);
7915 /* TUs share symbol tables.
7916 If this is the first TU to use this symtab, complete the construction
7917 of it with end_expandable_symtab. Otherwise, complete the addition of
7918 this TU's symbols to the existing symtab. */
7919 if (sig_type->type_unit_group->primary_symtab == NULL)
7921 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7922 sig_type->type_unit_group->primary_symtab = symtab;
7926 /* Set symtab language to language from DW_AT_language. If the
7927 compilation is from a C file generated by language preprocessors,
7928 do not set the language if it was already deduced by
7930 if (!(cu->language == language_c && symtab->language != language_c))
7931 symtab->language = cu->language;
7936 augment_type_symtab (objfile,
7937 sig_type->type_unit_group->primary_symtab);
7938 symtab = sig_type->type_unit_group->primary_symtab;
7941 if (dwarf2_per_objfile->using_index)
7942 per_cu->v.quick->symtab = symtab;
7945 struct partial_symtab *pst = per_cu->v.psymtab;
7946 pst->symtab = symtab;
7950 do_cleanups (back_to);
7953 /* Process an imported unit DIE. */
7956 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7958 struct attribute *attr;
7960 /* For now we don't handle imported units in type units. */
7961 if (cu->per_cu->is_debug_types)
7963 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7964 " supported in type units [in module %s]"),
7965 objfile_name (cu->objfile));
7968 attr = dwarf2_attr (die, DW_AT_import, cu);
7971 struct dwarf2_per_cu_data *per_cu;
7972 struct symtab *imported_symtab;
7976 offset = dwarf2_get_ref_die_offset (attr);
7977 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7978 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7980 /* If necessary, add it to the queue and load its DIEs. */
7981 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7982 load_full_comp_unit (per_cu, cu->language);
7984 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7989 /* Reset the in_process bit of a die. */
7992 reset_die_in_process (void *arg)
7994 struct die_info *die = arg;
7996 die->in_process = 0;
7999 /* Process a die and its children. */
8002 process_die (struct die_info *die, struct dwarf2_cu *cu)
8004 struct cleanup *in_process;
8006 /* We should only be processing those not already in process. */
8007 gdb_assert (!die->in_process);
8009 die->in_process = 1;
8010 in_process = make_cleanup (reset_die_in_process,die);
8014 case DW_TAG_padding:
8016 case DW_TAG_compile_unit:
8017 case DW_TAG_partial_unit:
8018 read_file_scope (die, cu);
8020 case DW_TAG_type_unit:
8021 read_type_unit_scope (die, cu);
8023 case DW_TAG_subprogram:
8024 case DW_TAG_inlined_subroutine:
8025 read_func_scope (die, cu);
8027 case DW_TAG_lexical_block:
8028 case DW_TAG_try_block:
8029 case DW_TAG_catch_block:
8030 read_lexical_block_scope (die, cu);
8032 case DW_TAG_GNU_call_site:
8033 read_call_site_scope (die, cu);
8035 case DW_TAG_class_type:
8036 case DW_TAG_interface_type:
8037 case DW_TAG_structure_type:
8038 case DW_TAG_union_type:
8039 process_structure_scope (die, cu);
8041 case DW_TAG_enumeration_type:
8042 process_enumeration_scope (die, cu);
8045 /* These dies have a type, but processing them does not create
8046 a symbol or recurse to process the children. Therefore we can
8047 read them on-demand through read_type_die. */
8048 case DW_TAG_subroutine_type:
8049 case DW_TAG_set_type:
8050 case DW_TAG_array_type:
8051 case DW_TAG_pointer_type:
8052 case DW_TAG_ptr_to_member_type:
8053 case DW_TAG_reference_type:
8054 case DW_TAG_string_type:
8057 case DW_TAG_base_type:
8058 case DW_TAG_subrange_type:
8059 case DW_TAG_typedef:
8060 /* Add a typedef symbol for the type definition, if it has a
8062 new_symbol (die, read_type_die (die, cu), cu);
8064 case DW_TAG_common_block:
8065 read_common_block (die, cu);
8067 case DW_TAG_common_inclusion:
8069 case DW_TAG_namespace:
8070 cu->processing_has_namespace_info = 1;
8071 read_namespace (die, cu);
8074 cu->processing_has_namespace_info = 1;
8075 read_module (die, cu);
8077 case DW_TAG_imported_declaration:
8078 cu->processing_has_namespace_info = 1;
8079 if (read_namespace_alias (die, cu))
8081 /* The declaration is not a global namespace alias: fall through. */
8082 case DW_TAG_imported_module:
8083 cu->processing_has_namespace_info = 1;
8084 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8085 || cu->language != language_fortran))
8086 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8087 dwarf_tag_name (die->tag));
8088 read_import_statement (die, cu);
8091 case DW_TAG_imported_unit:
8092 process_imported_unit_die (die, cu);
8096 new_symbol (die, NULL, cu);
8100 do_cleanups (in_process);
8103 /* DWARF name computation. */
8105 /* A helper function for dwarf2_compute_name which determines whether DIE
8106 needs to have the name of the scope prepended to the name listed in the
8110 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8112 struct attribute *attr;
8116 case DW_TAG_namespace:
8117 case DW_TAG_typedef:
8118 case DW_TAG_class_type:
8119 case DW_TAG_interface_type:
8120 case DW_TAG_structure_type:
8121 case DW_TAG_union_type:
8122 case DW_TAG_enumeration_type:
8123 case DW_TAG_enumerator:
8124 case DW_TAG_subprogram:
8126 case DW_TAG_imported_declaration:
8129 case DW_TAG_variable:
8130 case DW_TAG_constant:
8131 /* We only need to prefix "globally" visible variables. These include
8132 any variable marked with DW_AT_external or any variable that
8133 lives in a namespace. [Variables in anonymous namespaces
8134 require prefixing, but they are not DW_AT_external.] */
8136 if (dwarf2_attr (die, DW_AT_specification, cu))
8138 struct dwarf2_cu *spec_cu = cu;
8140 return die_needs_namespace (die_specification (die, &spec_cu),
8144 attr = dwarf2_attr (die, DW_AT_external, cu);
8145 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8146 && die->parent->tag != DW_TAG_module)
8148 /* A variable in a lexical block of some kind does not need a
8149 namespace, even though in C++ such variables may be external
8150 and have a mangled name. */
8151 if (die->parent->tag == DW_TAG_lexical_block
8152 || die->parent->tag == DW_TAG_try_block
8153 || die->parent->tag == DW_TAG_catch_block
8154 || die->parent->tag == DW_TAG_subprogram)
8163 /* Retrieve the last character from a mem_file. */
8166 do_ui_file_peek_last (void *object, const char *buffer, long length)
8168 char *last_char_p = (char *) object;
8171 *last_char_p = buffer[length - 1];
8174 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8175 compute the physname for the object, which include a method's:
8176 - formal parameters (C++/Java),
8177 - receiver type (Go),
8178 - return type (Java).
8180 The term "physname" is a bit confusing.
8181 For C++, for example, it is the demangled name.
8182 For Go, for example, it's the mangled name.
8184 For Ada, return the DIE's linkage name rather than the fully qualified
8185 name. PHYSNAME is ignored..
8187 The result is allocated on the objfile_obstack and canonicalized. */
8190 dwarf2_compute_name (const char *name,
8191 struct die_info *die, struct dwarf2_cu *cu,
8194 struct objfile *objfile = cu->objfile;
8197 name = dwarf2_name (die, cu);
8199 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
8200 compute it by typename_concat inside GDB. */
8201 if (cu->language == language_ada
8202 || (cu->language == language_fortran && physname))
8204 /* For Ada unit, we prefer the linkage name over the name, as
8205 the former contains the exported name, which the user expects
8206 to be able to reference. Ideally, we want the user to be able
8207 to reference this entity using either natural or linkage name,
8208 but we haven't started looking at this enhancement yet. */
8209 struct attribute *attr;
8211 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8213 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8214 if (attr && DW_STRING (attr))
8215 return DW_STRING (attr);
8218 /* These are the only languages we know how to qualify names in. */
8220 && (cu->language == language_cplus || cu->language == language_java
8221 || cu->language == language_fortran))
8223 if (die_needs_namespace (die, cu))
8227 struct ui_file *buf;
8229 prefix = determine_prefix (die, cu);
8230 buf = mem_fileopen ();
8231 if (*prefix != '\0')
8233 char *prefixed_name = typename_concat (NULL, prefix, name,
8236 fputs_unfiltered (prefixed_name, buf);
8237 xfree (prefixed_name);
8240 fputs_unfiltered (name, buf);
8242 /* Template parameters may be specified in the DIE's DW_AT_name, or
8243 as children with DW_TAG_template_type_param or
8244 DW_TAG_value_type_param. If the latter, add them to the name
8245 here. If the name already has template parameters, then
8246 skip this step; some versions of GCC emit both, and
8247 it is more efficient to use the pre-computed name.
8249 Something to keep in mind about this process: it is very
8250 unlikely, or in some cases downright impossible, to produce
8251 something that will match the mangled name of a function.
8252 If the definition of the function has the same debug info,
8253 we should be able to match up with it anyway. But fallbacks
8254 using the minimal symbol, for instance to find a method
8255 implemented in a stripped copy of libstdc++, will not work.
8256 If we do not have debug info for the definition, we will have to
8257 match them up some other way.
8259 When we do name matching there is a related problem with function
8260 templates; two instantiated function templates are allowed to
8261 differ only by their return types, which we do not add here. */
8263 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8265 struct attribute *attr;
8266 struct die_info *child;
8269 die->building_fullname = 1;
8271 for (child = die->child; child != NULL; child = child->sibling)
8275 const gdb_byte *bytes;
8276 struct dwarf2_locexpr_baton *baton;
8279 if (child->tag != DW_TAG_template_type_param
8280 && child->tag != DW_TAG_template_value_param)
8285 fputs_unfiltered ("<", buf);
8289 fputs_unfiltered (", ", buf);
8291 attr = dwarf2_attr (child, DW_AT_type, cu);
8294 complaint (&symfile_complaints,
8295 _("template parameter missing DW_AT_type"));
8296 fputs_unfiltered ("UNKNOWN_TYPE", buf);
8299 type = die_type (child, cu);
8301 if (child->tag == DW_TAG_template_type_param)
8303 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
8307 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8310 complaint (&symfile_complaints,
8311 _("template parameter missing "
8312 "DW_AT_const_value"));
8313 fputs_unfiltered ("UNKNOWN_VALUE", buf);
8317 dwarf2_const_value_attr (attr, type, name,
8318 &cu->comp_unit_obstack, cu,
8319 &value, &bytes, &baton);
8321 if (TYPE_NOSIGN (type))
8322 /* GDB prints characters as NUMBER 'CHAR'. If that's
8323 changed, this can use value_print instead. */
8324 c_printchar (value, type, buf);
8327 struct value_print_options opts;
8330 v = dwarf2_evaluate_loc_desc (type, NULL,
8334 else if (bytes != NULL)
8336 v = allocate_value (type);
8337 memcpy (value_contents_writeable (v), bytes,
8338 TYPE_LENGTH (type));
8341 v = value_from_longest (type, value);
8343 /* Specify decimal so that we do not depend on
8345 get_formatted_print_options (&opts, 'd');
8347 value_print (v, buf, &opts);
8353 die->building_fullname = 0;
8357 /* Close the argument list, with a space if necessary
8358 (nested templates). */
8359 char last_char = '\0';
8360 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8361 if (last_char == '>')
8362 fputs_unfiltered (" >", buf);
8364 fputs_unfiltered (">", buf);
8368 /* For Java and C++ methods, append formal parameter type
8369 information, if PHYSNAME. */
8371 if (physname && die->tag == DW_TAG_subprogram
8372 && (cu->language == language_cplus
8373 || cu->language == language_java))
8375 struct type *type = read_type_die (die, cu);
8377 c_type_print_args (type, buf, 1, cu->language,
8378 &type_print_raw_options);
8380 if (cu->language == language_java)
8382 /* For java, we must append the return type to method
8384 if (die->tag == DW_TAG_subprogram)
8385 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8386 0, 0, &type_print_raw_options);
8388 else if (cu->language == language_cplus)
8390 /* Assume that an artificial first parameter is
8391 "this", but do not crash if it is not. RealView
8392 marks unnamed (and thus unused) parameters as
8393 artificial; there is no way to differentiate
8395 if (TYPE_NFIELDS (type) > 0
8396 && TYPE_FIELD_ARTIFICIAL (type, 0)
8397 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8398 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8400 fputs_unfiltered (" const", buf);
8404 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8406 ui_file_delete (buf);
8408 if (cu->language == language_cplus)
8411 = dwarf2_canonicalize_name (name, cu,
8412 &objfile->objfile_obstack);
8423 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8424 If scope qualifiers are appropriate they will be added. The result
8425 will be allocated on the objfile_obstack, or NULL if the DIE does
8426 not have a name. NAME may either be from a previous call to
8427 dwarf2_name or NULL.
8429 The output string will be canonicalized (if C++/Java). */
8432 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8434 return dwarf2_compute_name (name, die, cu, 0);
8437 /* Construct a physname for the given DIE in CU. NAME may either be
8438 from a previous call to dwarf2_name or NULL. The result will be
8439 allocated on the objfile_objstack or NULL if the DIE does not have a
8442 The output string will be canonicalized (if C++/Java). */
8445 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8447 struct objfile *objfile = cu->objfile;
8448 struct attribute *attr;
8449 const char *retval, *mangled = NULL, *canon = NULL;
8450 struct cleanup *back_to;
8453 /* In this case dwarf2_compute_name is just a shortcut not building anything
8455 if (!die_needs_namespace (die, cu))
8456 return dwarf2_compute_name (name, die, cu, 1);
8458 back_to = make_cleanup (null_cleanup, NULL);
8460 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8462 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8464 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8466 if (attr && DW_STRING (attr))
8470 mangled = DW_STRING (attr);
8472 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8473 type. It is easier for GDB users to search for such functions as
8474 `name(params)' than `long name(params)'. In such case the minimal
8475 symbol names do not match the full symbol names but for template
8476 functions there is never a need to look up their definition from their
8477 declaration so the only disadvantage remains the minimal symbol
8478 variant `long name(params)' does not have the proper inferior type.
8481 if (cu->language == language_go)
8483 /* This is a lie, but we already lie to the caller new_symbol_full.
8484 new_symbol_full assumes we return the mangled name.
8485 This just undoes that lie until things are cleaned up. */
8490 demangled = gdb_demangle (mangled,
8491 (DMGL_PARAMS | DMGL_ANSI
8492 | (cu->language == language_java
8493 ? DMGL_JAVA | DMGL_RET_POSTFIX
8498 make_cleanup (xfree, demangled);
8508 if (canon == NULL || check_physname)
8510 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8512 if (canon != NULL && strcmp (physname, canon) != 0)
8514 /* It may not mean a bug in GDB. The compiler could also
8515 compute DW_AT_linkage_name incorrectly. But in such case
8516 GDB would need to be bug-to-bug compatible. */
8518 complaint (&symfile_complaints,
8519 _("Computed physname <%s> does not match demangled <%s> "
8520 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8521 physname, canon, mangled, die->offset.sect_off,
8522 objfile_name (objfile));
8524 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8525 is available here - over computed PHYSNAME. It is safer
8526 against both buggy GDB and buggy compilers. */
8540 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8542 do_cleanups (back_to);
8546 /* Inspect DIE in CU for a namespace alias. If one exists, record
8547 a new symbol for it.
8549 Returns 1 if a namespace alias was recorded, 0 otherwise. */
8552 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
8554 struct attribute *attr;
8556 /* If the die does not have a name, this is not a namespace
8558 attr = dwarf2_attr (die, DW_AT_name, cu);
8562 struct die_info *d = die;
8563 struct dwarf2_cu *imported_cu = cu;
8565 /* If the compiler has nested DW_AT_imported_declaration DIEs,
8566 keep inspecting DIEs until we hit the underlying import. */
8567 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
8568 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
8570 attr = dwarf2_attr (d, DW_AT_import, cu);
8574 d = follow_die_ref (d, attr, &imported_cu);
8575 if (d->tag != DW_TAG_imported_declaration)
8579 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
8581 complaint (&symfile_complaints,
8582 _("DIE at 0x%x has too many recursively imported "
8583 "declarations"), d->offset.sect_off);
8590 sect_offset offset = dwarf2_get_ref_die_offset (attr);
8592 type = get_die_type_at_offset (offset, cu->per_cu);
8593 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
8595 /* This declaration is a global namespace alias. Add
8596 a symbol for it whose type is the aliased namespace. */
8597 new_symbol (die, type, cu);
8606 /* Read the import statement specified by the given die and record it. */
8609 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8611 struct objfile *objfile = cu->objfile;
8612 struct attribute *import_attr;
8613 struct die_info *imported_die, *child_die;
8614 struct dwarf2_cu *imported_cu;
8615 const char *imported_name;
8616 const char *imported_name_prefix;
8617 const char *canonical_name;
8618 const char *import_alias;
8619 const char *imported_declaration = NULL;
8620 const char *import_prefix;
8621 VEC (const_char_ptr) *excludes = NULL;
8622 struct cleanup *cleanups;
8624 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8625 if (import_attr == NULL)
8627 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8628 dwarf_tag_name (die->tag));
8633 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8634 imported_name = dwarf2_name (imported_die, imported_cu);
8635 if (imported_name == NULL)
8637 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8639 The import in the following code:
8653 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8654 <52> DW_AT_decl_file : 1
8655 <53> DW_AT_decl_line : 6
8656 <54> DW_AT_import : <0x75>
8657 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8659 <5b> DW_AT_decl_file : 1
8660 <5c> DW_AT_decl_line : 2
8661 <5d> DW_AT_type : <0x6e>
8663 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8664 <76> DW_AT_byte_size : 4
8665 <77> DW_AT_encoding : 5 (signed)
8667 imports the wrong die ( 0x75 instead of 0x58 ).
8668 This case will be ignored until the gcc bug is fixed. */
8672 /* Figure out the local name after import. */
8673 import_alias = dwarf2_name (die, cu);
8675 /* Figure out where the statement is being imported to. */
8676 import_prefix = determine_prefix (die, cu);
8678 /* Figure out what the scope of the imported die is and prepend it
8679 to the name of the imported die. */
8680 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8682 if (imported_die->tag != DW_TAG_namespace
8683 && imported_die->tag != DW_TAG_module)
8685 imported_declaration = imported_name;
8686 canonical_name = imported_name_prefix;
8688 else if (strlen (imported_name_prefix) > 0)
8689 canonical_name = obconcat (&objfile->objfile_obstack,
8690 imported_name_prefix, "::", imported_name,
8693 canonical_name = imported_name;
8695 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8697 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8698 for (child_die = die->child; child_die && child_die->tag;
8699 child_die = sibling_die (child_die))
8701 /* DWARF-4: A Fortran use statement with a “rename list” may be
8702 represented by an imported module entry with an import attribute
8703 referring to the module and owned entries corresponding to those
8704 entities that are renamed as part of being imported. */
8706 if (child_die->tag != DW_TAG_imported_declaration)
8708 complaint (&symfile_complaints,
8709 _("child DW_TAG_imported_declaration expected "
8710 "- DIE at 0x%x [in module %s]"),
8711 child_die->offset.sect_off, objfile_name (objfile));
8715 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8716 if (import_attr == NULL)
8718 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8719 dwarf_tag_name (child_die->tag));
8724 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8726 imported_name = dwarf2_name (imported_die, imported_cu);
8727 if (imported_name == NULL)
8729 complaint (&symfile_complaints,
8730 _("child DW_TAG_imported_declaration has unknown "
8731 "imported name - DIE at 0x%x [in module %s]"),
8732 child_die->offset.sect_off, objfile_name (objfile));
8736 VEC_safe_push (const_char_ptr, excludes, imported_name);
8738 process_die (child_die, cu);
8741 cp_add_using_directive (import_prefix,
8744 imported_declaration,
8747 &objfile->objfile_obstack);
8749 do_cleanups (cleanups);
8752 /* Cleanup function for handle_DW_AT_stmt_list. */
8755 free_cu_line_header (void *arg)
8757 struct dwarf2_cu *cu = arg;
8759 free_line_header (cu->line_header);
8760 cu->line_header = NULL;
8763 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8764 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8765 this, it was first present in GCC release 4.3.0. */
8768 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8770 if (!cu->checked_producer)
8771 check_producer (cu);
8773 return cu->producer_is_gcc_lt_4_3;
8777 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8778 const char **name, const char **comp_dir)
8780 struct attribute *attr;
8785 /* Find the filename. Do not use dwarf2_name here, since the filename
8786 is not a source language identifier. */
8787 attr = dwarf2_attr (die, DW_AT_name, cu);
8790 *name = DW_STRING (attr);
8793 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8795 *comp_dir = DW_STRING (attr);
8796 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8797 && IS_ABSOLUTE_PATH (*name))
8799 char *d = ldirname (*name);
8803 make_cleanup (xfree, d);
8805 if (*comp_dir != NULL)
8807 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8808 directory, get rid of it. */
8809 char *cp = strchr (*comp_dir, ':');
8811 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8816 *name = "<unknown>";
8819 /* Handle DW_AT_stmt_list for a compilation unit.
8820 DIE is the DW_TAG_compile_unit die for CU.
8821 COMP_DIR is the compilation directory.
8822 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8825 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8826 const char *comp_dir) /* ARI: editCase function */
8828 struct attribute *attr;
8830 gdb_assert (! cu->per_cu->is_debug_types);
8832 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8835 unsigned int line_offset = DW_UNSND (attr);
8836 struct line_header *line_header
8837 = dwarf_decode_line_header (line_offset, cu);
8841 cu->line_header = line_header;
8842 make_cleanup (free_cu_line_header, cu);
8843 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8848 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8851 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8853 struct objfile *objfile = dwarf2_per_objfile->objfile;
8854 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8855 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8856 CORE_ADDR highpc = ((CORE_ADDR) 0);
8857 struct attribute *attr;
8858 const char *name = NULL;
8859 const char *comp_dir = NULL;
8860 struct die_info *child_die;
8861 bfd *abfd = objfile->obfd;
8864 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8866 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8868 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8869 from finish_block. */
8870 if (lowpc == ((CORE_ADDR) -1))
8875 find_file_and_directory (die, cu, &name, &comp_dir);
8877 prepare_one_comp_unit (cu, die, cu->language);
8879 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8880 standardised yet. As a workaround for the language detection we fall
8881 back to the DW_AT_producer string. */
8882 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8883 cu->language = language_opencl;
8885 /* Similar hack for Go. */
8886 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8887 set_cu_language (DW_LANG_Go, cu);
8889 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8891 /* Decode line number information if present. We do this before
8892 processing child DIEs, so that the line header table is available
8893 for DW_AT_decl_file. */
8894 handle_DW_AT_stmt_list (die, cu, comp_dir);
8896 /* Process all dies in compilation unit. */
8897 if (die->child != NULL)
8899 child_die = die->child;
8900 while (child_die && child_die->tag)
8902 process_die (child_die, cu);
8903 child_die = sibling_die (child_die);
8907 /* Decode macro information, if present. Dwarf 2 macro information
8908 refers to information in the line number info statement program
8909 header, so we can only read it if we've read the header
8911 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8912 if (attr && cu->line_header)
8914 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8915 complaint (&symfile_complaints,
8916 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8918 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8922 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8923 if (attr && cu->line_header)
8925 unsigned int macro_offset = DW_UNSND (attr);
8927 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8931 do_cleanups (back_to);
8934 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8935 Create the set of symtabs used by this TU, or if this TU is sharing
8936 symtabs with another TU and the symtabs have already been created
8937 then restore those symtabs in the line header.
8938 We don't need the pc/line-number mapping for type units. */
8941 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8943 struct objfile *objfile = dwarf2_per_objfile->objfile;
8944 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8945 struct type_unit_group *tu_group;
8947 struct line_header *lh;
8948 struct attribute *attr;
8949 unsigned int i, line_offset;
8950 struct signatured_type *sig_type;
8952 gdb_assert (per_cu->is_debug_types);
8953 sig_type = (struct signatured_type *) per_cu;
8955 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8957 /* If we're using .gdb_index (includes -readnow) then
8958 per_cu->type_unit_group may not have been set up yet. */
8959 if (sig_type->type_unit_group == NULL)
8960 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8961 tu_group = sig_type->type_unit_group;
8963 /* If we've already processed this stmt_list there's no real need to
8964 do it again, we could fake it and just recreate the part we need
8965 (file name,index -> symtab mapping). If data shows this optimization
8966 is useful we can do it then. */
8967 first_time = tu_group->primary_symtab == NULL;
8969 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8974 line_offset = DW_UNSND (attr);
8975 lh = dwarf_decode_line_header (line_offset, cu);
8980 dwarf2_start_symtab (cu, "", NULL, 0);
8983 gdb_assert (tu_group->symtabs == NULL);
8986 /* Note: The primary symtab will get allocated at the end. */
8990 cu->line_header = lh;
8991 make_cleanup (free_cu_line_header, cu);
8995 dwarf2_start_symtab (cu, "", NULL, 0);
8997 tu_group->num_symtabs = lh->num_file_names;
8998 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
9000 for (i = 0; i < lh->num_file_names; ++i)
9002 const char *dir = NULL;
9003 struct file_entry *fe = &lh->file_names[i];
9006 dir = lh->include_dirs[fe->dir_index - 1];
9007 dwarf2_start_subfile (fe->name, dir, NULL);
9009 /* Note: We don't have to watch for the main subfile here, type units
9010 don't have DW_AT_name. */
9012 if (current_subfile->symtab == NULL)
9014 /* NOTE: start_subfile will recognize when it's been passed
9015 a file it has already seen. So we can't assume there's a
9016 simple mapping from lh->file_names to subfiles,
9017 lh->file_names may contain dups. */
9018 current_subfile->symtab = allocate_symtab (current_subfile->name,
9022 fe->symtab = current_subfile->symtab;
9023 tu_group->symtabs[i] = fe->symtab;
9030 for (i = 0; i < lh->num_file_names; ++i)
9032 struct file_entry *fe = &lh->file_names[i];
9034 fe->symtab = tu_group->symtabs[i];
9038 /* The main symtab is allocated last. Type units don't have DW_AT_name
9039 so they don't have a "real" (so to speak) symtab anyway.
9040 There is later code that will assign the main symtab to all symbols
9041 that don't have one. We need to handle the case of a symbol with a
9042 missing symtab (DW_AT_decl_file) anyway. */
9045 /* Process DW_TAG_type_unit.
9046 For TUs we want to skip the first top level sibling if it's not the
9047 actual type being defined by this TU. In this case the first top
9048 level sibling is there to provide context only. */
9051 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9053 struct die_info *child_die;
9055 prepare_one_comp_unit (cu, die, language_minimal);
9057 /* Initialize (or reinitialize) the machinery for building symtabs.
9058 We do this before processing child DIEs, so that the line header table
9059 is available for DW_AT_decl_file. */
9060 setup_type_unit_groups (die, cu);
9062 if (die->child != NULL)
9064 child_die = die->child;
9065 while (child_die && child_die->tag)
9067 process_die (child_die, cu);
9068 child_die = sibling_die (child_die);
9075 http://gcc.gnu.org/wiki/DebugFission
9076 http://gcc.gnu.org/wiki/DebugFissionDWP
9078 To simplify handling of both DWO files ("object" files with the DWARF info)
9079 and DWP files (a file with the DWOs packaged up into one file), we treat
9080 DWP files as having a collection of virtual DWO files. */
9083 hash_dwo_file (const void *item)
9085 const struct dwo_file *dwo_file = item;
9088 hash = htab_hash_string (dwo_file->dwo_name);
9089 if (dwo_file->comp_dir != NULL)
9090 hash += htab_hash_string (dwo_file->comp_dir);
9095 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9097 const struct dwo_file *lhs = item_lhs;
9098 const struct dwo_file *rhs = item_rhs;
9100 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9102 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9103 return lhs->comp_dir == rhs->comp_dir;
9104 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9107 /* Allocate a hash table for DWO files. */
9110 allocate_dwo_file_hash_table (void)
9112 struct objfile *objfile = dwarf2_per_objfile->objfile;
9114 return htab_create_alloc_ex (41,
9118 &objfile->objfile_obstack,
9119 hashtab_obstack_allocate,
9120 dummy_obstack_deallocate);
9123 /* Lookup DWO file DWO_NAME. */
9126 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9128 struct dwo_file find_entry;
9131 if (dwarf2_per_objfile->dwo_files == NULL)
9132 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9134 memset (&find_entry, 0, sizeof (find_entry));
9135 find_entry.dwo_name = dwo_name;
9136 find_entry.comp_dir = comp_dir;
9137 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9143 hash_dwo_unit (const void *item)
9145 const struct dwo_unit *dwo_unit = item;
9147 /* This drops the top 32 bits of the id, but is ok for a hash. */
9148 return dwo_unit->signature;
9152 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9154 const struct dwo_unit *lhs = item_lhs;
9155 const struct dwo_unit *rhs = item_rhs;
9157 /* The signature is assumed to be unique within the DWO file.
9158 So while object file CU dwo_id's always have the value zero,
9159 that's OK, assuming each object file DWO file has only one CU,
9160 and that's the rule for now. */
9161 return lhs->signature == rhs->signature;
9164 /* Allocate a hash table for DWO CUs,TUs.
9165 There is one of these tables for each of CUs,TUs for each DWO file. */
9168 allocate_dwo_unit_table (struct objfile *objfile)
9170 /* Start out with a pretty small number.
9171 Generally DWO files contain only one CU and maybe some TUs. */
9172 return htab_create_alloc_ex (3,
9176 &objfile->objfile_obstack,
9177 hashtab_obstack_allocate,
9178 dummy_obstack_deallocate);
9181 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9183 struct create_dwo_cu_data
9185 struct dwo_file *dwo_file;
9186 struct dwo_unit dwo_unit;
9189 /* die_reader_func for create_dwo_cu. */
9192 create_dwo_cu_reader (const struct die_reader_specs *reader,
9193 const gdb_byte *info_ptr,
9194 struct die_info *comp_unit_die,
9198 struct dwarf2_cu *cu = reader->cu;
9199 struct objfile *objfile = dwarf2_per_objfile->objfile;
9200 sect_offset offset = cu->per_cu->offset;
9201 struct dwarf2_section_info *section = cu->per_cu->section;
9202 struct create_dwo_cu_data *data = datap;
9203 struct dwo_file *dwo_file = data->dwo_file;
9204 struct dwo_unit *dwo_unit = &data->dwo_unit;
9205 struct attribute *attr;
9207 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9210 complaint (&symfile_complaints,
9211 _("Dwarf Error: debug entry at offset 0x%x is missing"
9212 " its dwo_id [in module %s]"),
9213 offset.sect_off, dwo_file->dwo_name);
9217 dwo_unit->dwo_file = dwo_file;
9218 dwo_unit->signature = DW_UNSND (attr);
9219 dwo_unit->section = section;
9220 dwo_unit->offset = offset;
9221 dwo_unit->length = cu->per_cu->length;
9223 if (dwarf2_read_debug)
9224 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9225 offset.sect_off, hex_string (dwo_unit->signature));
9228 /* Create the dwo_unit for the lone CU in DWO_FILE.
9229 Note: This function processes DWO files only, not DWP files. */
9231 static struct dwo_unit *
9232 create_dwo_cu (struct dwo_file *dwo_file)
9234 struct objfile *objfile = dwarf2_per_objfile->objfile;
9235 struct dwarf2_section_info *section = &dwo_file->sections.info;
9238 const gdb_byte *info_ptr, *end_ptr;
9239 struct create_dwo_cu_data create_dwo_cu_data;
9240 struct dwo_unit *dwo_unit;
9242 dwarf2_read_section (objfile, section);
9243 info_ptr = section->buffer;
9245 if (info_ptr == NULL)
9248 /* We can't set abfd until now because the section may be empty or
9249 not present, in which case section->asection will be NULL. */
9250 abfd = get_section_bfd_owner (section);
9252 if (dwarf2_read_debug)
9254 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9255 get_section_name (section),
9256 get_section_file_name (section));
9259 create_dwo_cu_data.dwo_file = dwo_file;
9262 end_ptr = info_ptr + section->size;
9263 while (info_ptr < end_ptr)
9265 struct dwarf2_per_cu_data per_cu;
9267 memset (&create_dwo_cu_data.dwo_unit, 0,
9268 sizeof (create_dwo_cu_data.dwo_unit));
9269 memset (&per_cu, 0, sizeof (per_cu));
9270 per_cu.objfile = objfile;
9271 per_cu.is_debug_types = 0;
9272 per_cu.offset.sect_off = info_ptr - section->buffer;
9273 per_cu.section = section;
9275 init_cutu_and_read_dies_no_follow (&per_cu, dwo_file,
9276 create_dwo_cu_reader,
9277 &create_dwo_cu_data);
9279 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
9281 /* If we've already found one, complain. We only support one
9282 because having more than one requires hacking the dwo_name of
9283 each to match, which is highly unlikely to happen. */
9284 if (dwo_unit != NULL)
9286 complaint (&symfile_complaints,
9287 _("Multiple CUs in DWO file %s [in module %s]"),
9288 dwo_file->dwo_name, objfile_name (objfile));
9292 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9293 *dwo_unit = create_dwo_cu_data.dwo_unit;
9296 info_ptr += per_cu.length;
9302 /* DWP file .debug_{cu,tu}_index section format:
9303 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9307 Both index sections have the same format, and serve to map a 64-bit
9308 signature to a set of section numbers. Each section begins with a header,
9309 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9310 indexes, and a pool of 32-bit section numbers. The index sections will be
9311 aligned at 8-byte boundaries in the file.
9313 The index section header consists of:
9315 V, 32 bit version number
9317 N, 32 bit number of compilation units or type units in the index
9318 M, 32 bit number of slots in the hash table
9320 Numbers are recorded using the byte order of the application binary.
9322 The hash table begins at offset 16 in the section, and consists of an array
9323 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9324 order of the application binary). Unused slots in the hash table are 0.
9325 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9327 The parallel table begins immediately after the hash table
9328 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9329 array of 32-bit indexes (using the byte order of the application binary),
9330 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9331 table contains a 32-bit index into the pool of section numbers. For unused
9332 hash table slots, the corresponding entry in the parallel table will be 0.
9334 The pool of section numbers begins immediately following the hash table
9335 (at offset 16 + 12 * M from the beginning of the section). The pool of
9336 section numbers consists of an array of 32-bit words (using the byte order
9337 of the application binary). Each item in the array is indexed starting
9338 from 0. The hash table entry provides the index of the first section
9339 number in the set. Additional section numbers in the set follow, and the
9340 set is terminated by a 0 entry (section number 0 is not used in ELF).
9342 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9343 section must be the first entry in the set, and the .debug_abbrev.dwo must
9344 be the second entry. Other members of the set may follow in any order.
9350 DWP Version 2 combines all the .debug_info, etc. sections into one,
9351 and the entries in the index tables are now offsets into these sections.
9352 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9355 Index Section Contents:
9357 Hash Table of Signatures dwp_hash_table.hash_table
9358 Parallel Table of Indices dwp_hash_table.unit_table
9359 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9360 Table of Section Sizes dwp_hash_table.v2.sizes
9362 The index section header consists of:
9364 V, 32 bit version number
9365 L, 32 bit number of columns in the table of section offsets
9366 N, 32 bit number of compilation units or type units in the index
9367 M, 32 bit number of slots in the hash table
9369 Numbers are recorded using the byte order of the application binary.
9371 The hash table has the same format as version 1.
9372 The parallel table of indices has the same format as version 1,
9373 except that the entries are origin-1 indices into the table of sections
9374 offsets and the table of section sizes.
9376 The table of offsets begins immediately following the parallel table
9377 (at offset 16 + 12 * M from the beginning of the section). The table is
9378 a two-dimensional array of 32-bit words (using the byte order of the
9379 application binary), with L columns and N+1 rows, in row-major order.
9380 Each row in the array is indexed starting from 0. The first row provides
9381 a key to the remaining rows: each column in this row provides an identifier
9382 for a debug section, and the offsets in the same column of subsequent rows
9383 refer to that section. The section identifiers are:
9385 DW_SECT_INFO 1 .debug_info.dwo
9386 DW_SECT_TYPES 2 .debug_types.dwo
9387 DW_SECT_ABBREV 3 .debug_abbrev.dwo
9388 DW_SECT_LINE 4 .debug_line.dwo
9389 DW_SECT_LOC 5 .debug_loc.dwo
9390 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
9391 DW_SECT_MACINFO 7 .debug_macinfo.dwo
9392 DW_SECT_MACRO 8 .debug_macro.dwo
9394 The offsets provided by the CU and TU index sections are the base offsets
9395 for the contributions made by each CU or TU to the corresponding section
9396 in the package file. Each CU and TU header contains an abbrev_offset
9397 field, used to find the abbreviations table for that CU or TU within the
9398 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
9399 be interpreted as relative to the base offset given in the index section.
9400 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
9401 should be interpreted as relative to the base offset for .debug_line.dwo,
9402 and offsets into other debug sections obtained from DWARF attributes should
9403 also be interpreted as relative to the corresponding base offset.
9405 The table of sizes begins immediately following the table of offsets.
9406 Like the table of offsets, it is a two-dimensional array of 32-bit words,
9407 with L columns and N rows, in row-major order. Each row in the array is
9408 indexed starting from 1 (row 0 is shared by the two tables).
9412 Hash table lookup is handled the same in version 1 and 2:
9414 We assume that N and M will not exceed 2^32 - 1.
9415 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
9417 Given a 64-bit compilation unit signature or a type signature S, an entry
9418 in the hash table is located as follows:
9420 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
9421 the low-order k bits all set to 1.
9423 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
9425 3) If the hash table entry at index H matches the signature, use that
9426 entry. If the hash table entry at index H is unused (all zeroes),
9427 terminate the search: the signature is not present in the table.
9429 4) Let H = (H + H') modulo M. Repeat at Step 3.
9431 Because M > N and H' and M are relatively prime, the search is guaranteed
9432 to stop at an unused slot or find the match. */
9434 /* Create a hash table to map DWO IDs to their CU/TU entry in
9435 .debug_{info,types}.dwo in DWP_FILE.
9436 Returns NULL if there isn't one.
9437 Note: This function processes DWP files only, not DWO files. */
9439 static struct dwp_hash_table *
9440 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
9442 struct objfile *objfile = dwarf2_per_objfile->objfile;
9443 bfd *dbfd = dwp_file->dbfd;
9444 const gdb_byte *index_ptr, *index_end;
9445 struct dwarf2_section_info *index;
9446 uint32_t version, nr_columns, nr_units, nr_slots;
9447 struct dwp_hash_table *htab;
9450 index = &dwp_file->sections.tu_index;
9452 index = &dwp_file->sections.cu_index;
9454 if (dwarf2_section_empty_p (index))
9456 dwarf2_read_section (objfile, index);
9458 index_ptr = index->buffer;
9459 index_end = index_ptr + index->size;
9461 version = read_4_bytes (dbfd, index_ptr);
9464 nr_columns = read_4_bytes (dbfd, index_ptr);
9468 nr_units = read_4_bytes (dbfd, index_ptr);
9470 nr_slots = read_4_bytes (dbfd, index_ptr);
9473 if (version != 1 && version != 2)
9475 error (_("Dwarf Error: unsupported DWP file version (%s)"
9477 pulongest (version), dwp_file->name);
9479 if (nr_slots != (nr_slots & -nr_slots))
9481 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9482 " is not power of 2 [in module %s]"),
9483 pulongest (nr_slots), dwp_file->name);
9486 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9487 htab->version = version;
9488 htab->nr_columns = nr_columns;
9489 htab->nr_units = nr_units;
9490 htab->nr_slots = nr_slots;
9491 htab->hash_table = index_ptr;
9492 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9494 /* Exit early if the table is empty. */
9495 if (nr_slots == 0 || nr_units == 0
9496 || (version == 2 && nr_columns == 0))
9498 /* All must be zero. */
9499 if (nr_slots != 0 || nr_units != 0
9500 || (version == 2 && nr_columns != 0))
9502 complaint (&symfile_complaints,
9503 _("Empty DWP but nr_slots,nr_units,nr_columns not"
9504 " all zero [in modules %s]"),
9512 htab->section_pool.v1.indices =
9513 htab->unit_table + sizeof (uint32_t) * nr_slots;
9514 /* It's harder to decide whether the section is too small in v1.
9515 V1 is deprecated anyway so we punt. */
9519 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
9520 int *ids = htab->section_pool.v2.section_ids;
9521 /* Reverse map for error checking. */
9522 int ids_seen[DW_SECT_MAX + 1];
9527 error (_("Dwarf Error: bad DWP hash table, too few columns"
9528 " in section table [in module %s]"),
9531 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
9533 error (_("Dwarf Error: bad DWP hash table, too many columns"
9534 " in section table [in module %s]"),
9537 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9538 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9539 for (i = 0; i < nr_columns; ++i)
9541 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
9543 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
9545 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
9546 " in section table [in module %s]"),
9547 id, dwp_file->name);
9549 if (ids_seen[id] != -1)
9551 error (_("Dwarf Error: bad DWP hash table, duplicate section"
9552 " id %d in section table [in module %s]"),
9553 id, dwp_file->name);
9558 /* Must have exactly one info or types section. */
9559 if (((ids_seen[DW_SECT_INFO] != -1)
9560 + (ids_seen[DW_SECT_TYPES] != -1))
9563 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
9564 " DWO info/types section [in module %s]"),
9567 /* Must have an abbrev section. */
9568 if (ids_seen[DW_SECT_ABBREV] == -1)
9570 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
9571 " section [in module %s]"),
9574 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
9575 htab->section_pool.v2.sizes =
9576 htab->section_pool.v2.offsets + (sizeof (uint32_t)
9577 * nr_units * nr_columns);
9578 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
9579 * nr_units * nr_columns))
9582 error (_("Dwarf Error: DWP index section is corrupt (too small)"
9591 /* Update SECTIONS with the data from SECTP.
9593 This function is like the other "locate" section routines that are
9594 passed to bfd_map_over_sections, but in this context the sections to
9595 read comes from the DWP V1 hash table, not the full ELF section table.
9597 The result is non-zero for success, or zero if an error was found. */
9600 locate_v1_virtual_dwo_sections (asection *sectp,
9601 struct virtual_v1_dwo_sections *sections)
9603 const struct dwop_section_names *names = &dwop_section_names;
9605 if (section_is_p (sectp->name, &names->abbrev_dwo))
9607 /* There can be only one. */
9608 if (sections->abbrev.s.asection != NULL)
9610 sections->abbrev.s.asection = sectp;
9611 sections->abbrev.size = bfd_get_section_size (sectp);
9613 else if (section_is_p (sectp->name, &names->info_dwo)
9614 || section_is_p (sectp->name, &names->types_dwo))
9616 /* There can be only one. */
9617 if (sections->info_or_types.s.asection != NULL)
9619 sections->info_or_types.s.asection = sectp;
9620 sections->info_or_types.size = bfd_get_section_size (sectp);
9622 else if (section_is_p (sectp->name, &names->line_dwo))
9624 /* There can be only one. */
9625 if (sections->line.s.asection != NULL)
9627 sections->line.s.asection = sectp;
9628 sections->line.size = bfd_get_section_size (sectp);
9630 else if (section_is_p (sectp->name, &names->loc_dwo))
9632 /* There can be only one. */
9633 if (sections->loc.s.asection != NULL)
9635 sections->loc.s.asection = sectp;
9636 sections->loc.size = bfd_get_section_size (sectp);
9638 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9640 /* There can be only one. */
9641 if (sections->macinfo.s.asection != NULL)
9643 sections->macinfo.s.asection = sectp;
9644 sections->macinfo.size = bfd_get_section_size (sectp);
9646 else if (section_is_p (sectp->name, &names->macro_dwo))
9648 /* There can be only one. */
9649 if (sections->macro.s.asection != NULL)
9651 sections->macro.s.asection = sectp;
9652 sections->macro.size = bfd_get_section_size (sectp);
9654 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9656 /* There can be only one. */
9657 if (sections->str_offsets.s.asection != NULL)
9659 sections->str_offsets.s.asection = sectp;
9660 sections->str_offsets.size = bfd_get_section_size (sectp);
9664 /* No other kind of section is valid. */
9671 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
9672 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
9673 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
9674 This is for DWP version 1 files. */
9676 static struct dwo_unit *
9677 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
9678 uint32_t unit_index,
9679 const char *comp_dir,
9680 ULONGEST signature, int is_debug_types)
9682 struct objfile *objfile = dwarf2_per_objfile->objfile;
9683 const struct dwp_hash_table *dwp_htab =
9684 is_debug_types ? dwp_file->tus : dwp_file->cus;
9685 bfd *dbfd = dwp_file->dbfd;
9686 const char *kind = is_debug_types ? "TU" : "CU";
9687 struct dwo_file *dwo_file;
9688 struct dwo_unit *dwo_unit;
9689 struct virtual_v1_dwo_sections sections;
9690 void **dwo_file_slot;
9691 char *virtual_dwo_name;
9692 struct dwarf2_section_info *cutu;
9693 struct cleanup *cleanups;
9696 gdb_assert (dwp_file->version == 1);
9698 if (dwarf2_read_debug)
9700 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
9702 pulongest (unit_index), hex_string (signature),
9706 /* Fetch the sections of this DWO unit.
9707 Put a limit on the number of sections we look for so that bad data
9708 doesn't cause us to loop forever. */
9710 #define MAX_NR_V1_DWO_SECTIONS \
9711 (1 /* .debug_info or .debug_types */ \
9712 + 1 /* .debug_abbrev */ \
9713 + 1 /* .debug_line */ \
9714 + 1 /* .debug_loc */ \
9715 + 1 /* .debug_str_offsets */ \
9716 + 1 /* .debug_macro or .debug_macinfo */ \
9717 + 1 /* trailing zero */)
9719 memset (§ions, 0, sizeof (sections));
9720 cleanups = make_cleanup (null_cleanup, 0);
9722 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
9725 uint32_t section_nr =
9727 dwp_htab->section_pool.v1.indices
9728 + (unit_index + i) * sizeof (uint32_t));
9730 if (section_nr == 0)
9732 if (section_nr >= dwp_file->num_sections)
9734 error (_("Dwarf Error: bad DWP hash table, section number too large"
9739 sectp = dwp_file->elf_sections[section_nr];
9740 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
9742 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9749 || dwarf2_section_empty_p (§ions.info_or_types)
9750 || dwarf2_section_empty_p (§ions.abbrev))
9752 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9756 if (i == MAX_NR_V1_DWO_SECTIONS)
9758 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9763 /* It's easier for the rest of the code if we fake a struct dwo_file and
9764 have dwo_unit "live" in that. At least for now.
9766 The DWP file can be made up of a random collection of CUs and TUs.
9767 However, for each CU + set of TUs that came from the same original DWO
9768 file, we can combine them back into a virtual DWO file to save space
9769 (fewer struct dwo_file objects to allocate). Remember that for really
9770 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9773 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9774 get_section_id (§ions.abbrev),
9775 get_section_id (§ions.line),
9776 get_section_id (§ions.loc),
9777 get_section_id (§ions.str_offsets));
9778 make_cleanup (xfree, virtual_dwo_name);
9779 /* Can we use an existing virtual DWO file? */
9780 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9781 /* Create one if necessary. */
9782 if (*dwo_file_slot == NULL)
9784 if (dwarf2_read_debug)
9786 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9789 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9790 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9792 strlen (virtual_dwo_name));
9793 dwo_file->comp_dir = comp_dir;
9794 dwo_file->sections.abbrev = sections.abbrev;
9795 dwo_file->sections.line = sections.line;
9796 dwo_file->sections.loc = sections.loc;
9797 dwo_file->sections.macinfo = sections.macinfo;
9798 dwo_file->sections.macro = sections.macro;
9799 dwo_file->sections.str_offsets = sections.str_offsets;
9800 /* The "str" section is global to the entire DWP file. */
9801 dwo_file->sections.str = dwp_file->sections.str;
9802 /* The info or types section is assigned below to dwo_unit,
9803 there's no need to record it in dwo_file.
9804 Also, we can't simply record type sections in dwo_file because
9805 we record a pointer into the vector in dwo_unit. As we collect more
9806 types we'll grow the vector and eventually have to reallocate space
9807 for it, invalidating all copies of pointers into the previous
9809 *dwo_file_slot = dwo_file;
9813 if (dwarf2_read_debug)
9815 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9818 dwo_file = *dwo_file_slot;
9820 do_cleanups (cleanups);
9822 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9823 dwo_unit->dwo_file = dwo_file;
9824 dwo_unit->signature = signature;
9825 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9826 sizeof (struct dwarf2_section_info));
9827 *dwo_unit->section = sections.info_or_types;
9828 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
9833 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
9834 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
9835 piece within that section used by a TU/CU, return a virtual section
9836 of just that piece. */
9838 static struct dwarf2_section_info
9839 create_dwp_v2_section (struct dwarf2_section_info *section,
9840 bfd_size_type offset, bfd_size_type size)
9842 struct dwarf2_section_info result;
9845 gdb_assert (section != NULL);
9846 gdb_assert (!section->is_virtual);
9848 memset (&result, 0, sizeof (result));
9849 result.s.containing_section = section;
9850 result.is_virtual = 1;
9855 sectp = get_section_bfd_section (section);
9857 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
9858 bounds of the real section. This is a pretty-rare event, so just
9859 flag an error (easier) instead of a warning and trying to cope. */
9861 || offset + size > bfd_get_section_size (sectp))
9863 bfd *abfd = sectp->owner;
9865 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
9866 " in section %s [in module %s]"),
9867 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
9868 objfile_name (dwarf2_per_objfile->objfile));
9871 result.virtual_offset = offset;
9876 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
9877 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
9878 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
9879 This is for DWP version 2 files. */
9881 static struct dwo_unit *
9882 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
9883 uint32_t unit_index,
9884 const char *comp_dir,
9885 ULONGEST signature, int is_debug_types)
9887 struct objfile *objfile = dwarf2_per_objfile->objfile;
9888 const struct dwp_hash_table *dwp_htab =
9889 is_debug_types ? dwp_file->tus : dwp_file->cus;
9890 bfd *dbfd = dwp_file->dbfd;
9891 const char *kind = is_debug_types ? "TU" : "CU";
9892 struct dwo_file *dwo_file;
9893 struct dwo_unit *dwo_unit;
9894 struct virtual_v2_dwo_sections sections;
9895 void **dwo_file_slot;
9896 char *virtual_dwo_name;
9897 struct dwarf2_section_info *cutu;
9898 struct cleanup *cleanups;
9901 gdb_assert (dwp_file->version == 2);
9903 if (dwarf2_read_debug)
9905 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
9907 pulongest (unit_index), hex_string (signature),
9911 /* Fetch the section offsets of this DWO unit. */
9913 memset (§ions, 0, sizeof (sections));
9914 cleanups = make_cleanup (null_cleanup, 0);
9916 for (i = 0; i < dwp_htab->nr_columns; ++i)
9918 uint32_t offset = read_4_bytes (dbfd,
9919 dwp_htab->section_pool.v2.offsets
9920 + (((unit_index - 1) * dwp_htab->nr_columns
9922 * sizeof (uint32_t)));
9923 uint32_t size = read_4_bytes (dbfd,
9924 dwp_htab->section_pool.v2.sizes
9925 + (((unit_index - 1) * dwp_htab->nr_columns
9927 * sizeof (uint32_t)));
9929 switch (dwp_htab->section_pool.v2.section_ids[i])
9933 sections.info_or_types_offset = offset;
9934 sections.info_or_types_size = size;
9936 case DW_SECT_ABBREV:
9937 sections.abbrev_offset = offset;
9938 sections.abbrev_size = size;
9941 sections.line_offset = offset;
9942 sections.line_size = size;
9945 sections.loc_offset = offset;
9946 sections.loc_size = size;
9948 case DW_SECT_STR_OFFSETS:
9949 sections.str_offsets_offset = offset;
9950 sections.str_offsets_size = size;
9952 case DW_SECT_MACINFO:
9953 sections.macinfo_offset = offset;
9954 sections.macinfo_size = size;
9957 sections.macro_offset = offset;
9958 sections.macro_size = size;
9963 /* It's easier for the rest of the code if we fake a struct dwo_file and
9964 have dwo_unit "live" in that. At least for now.
9966 The DWP file can be made up of a random collection of CUs and TUs.
9967 However, for each CU + set of TUs that came from the same original DWO
9968 file, we can combine them back into a virtual DWO file to save space
9969 (fewer struct dwo_file objects to allocate). Remember that for really
9970 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9973 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
9974 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
9975 (long) (sections.line_size ? sections.line_offset : 0),
9976 (long) (sections.loc_size ? sections.loc_offset : 0),
9977 (long) (sections.str_offsets_size
9978 ? sections.str_offsets_offset : 0));
9979 make_cleanup (xfree, virtual_dwo_name);
9980 /* Can we use an existing virtual DWO file? */
9981 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9982 /* Create one if necessary. */
9983 if (*dwo_file_slot == NULL)
9985 if (dwarf2_read_debug)
9987 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9990 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9991 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9993 strlen (virtual_dwo_name));
9994 dwo_file->comp_dir = comp_dir;
9995 dwo_file->sections.abbrev =
9996 create_dwp_v2_section (&dwp_file->sections.abbrev,
9997 sections.abbrev_offset, sections.abbrev_size);
9998 dwo_file->sections.line =
9999 create_dwp_v2_section (&dwp_file->sections.line,
10000 sections.line_offset, sections.line_size);
10001 dwo_file->sections.loc =
10002 create_dwp_v2_section (&dwp_file->sections.loc,
10003 sections.loc_offset, sections.loc_size);
10004 dwo_file->sections.macinfo =
10005 create_dwp_v2_section (&dwp_file->sections.macinfo,
10006 sections.macinfo_offset, sections.macinfo_size);
10007 dwo_file->sections.macro =
10008 create_dwp_v2_section (&dwp_file->sections.macro,
10009 sections.macro_offset, sections.macro_size);
10010 dwo_file->sections.str_offsets =
10011 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10012 sections.str_offsets_offset,
10013 sections.str_offsets_size);
10014 /* The "str" section is global to the entire DWP file. */
10015 dwo_file->sections.str = dwp_file->sections.str;
10016 /* The info or types section is assigned below to dwo_unit,
10017 there's no need to record it in dwo_file.
10018 Also, we can't simply record type sections in dwo_file because
10019 we record a pointer into the vector in dwo_unit. As we collect more
10020 types we'll grow the vector and eventually have to reallocate space
10021 for it, invalidating all copies of pointers into the previous
10023 *dwo_file_slot = dwo_file;
10027 if (dwarf2_read_debug)
10029 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10032 dwo_file = *dwo_file_slot;
10034 do_cleanups (cleanups);
10036 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10037 dwo_unit->dwo_file = dwo_file;
10038 dwo_unit->signature = signature;
10039 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
10040 sizeof (struct dwarf2_section_info));
10041 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10042 ? &dwp_file->sections.types
10043 : &dwp_file->sections.info,
10044 sections.info_or_types_offset,
10045 sections.info_or_types_size);
10046 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10051 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10052 Returns NULL if the signature isn't found. */
10054 static struct dwo_unit *
10055 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10056 ULONGEST signature, int is_debug_types)
10058 const struct dwp_hash_table *dwp_htab =
10059 is_debug_types ? dwp_file->tus : dwp_file->cus;
10060 bfd *dbfd = dwp_file->dbfd;
10061 uint32_t mask = dwp_htab->nr_slots - 1;
10062 uint32_t hash = signature & mask;
10063 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10066 struct dwo_unit find_dwo_cu, *dwo_cu;
10068 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10069 find_dwo_cu.signature = signature;
10070 slot = htab_find_slot (is_debug_types
10071 ? dwp_file->loaded_tus
10072 : dwp_file->loaded_cus,
10073 &find_dwo_cu, INSERT);
10078 /* Use a for loop so that we don't loop forever on bad debug info. */
10079 for (i = 0; i < dwp_htab->nr_slots; ++i)
10081 ULONGEST signature_in_table;
10083 signature_in_table =
10084 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10085 if (signature_in_table == signature)
10087 uint32_t unit_index =
10088 read_4_bytes (dbfd,
10089 dwp_htab->unit_table + hash * sizeof (uint32_t));
10091 if (dwp_file->version == 1)
10093 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10094 comp_dir, signature,
10099 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10100 comp_dir, signature,
10105 if (signature_in_table == 0)
10107 hash = (hash + hash2) & mask;
10110 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10111 " [in module %s]"),
10115 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10116 Open the file specified by FILE_NAME and hand it off to BFD for
10117 preliminary analysis. Return a newly initialized bfd *, which
10118 includes a canonicalized copy of FILE_NAME.
10119 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10120 SEARCH_CWD is true if the current directory is to be searched.
10121 It will be searched before debug-file-directory.
10122 If successful, the file is added to the bfd include table of the
10123 objfile's bfd (see gdb_bfd_record_inclusion).
10124 If unable to find/open the file, return NULL.
10125 NOTE: This function is derived from symfile_bfd_open. */
10128 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10132 char *absolute_name;
10133 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10134 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10135 to debug_file_directory. */
10137 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10141 if (*debug_file_directory != '\0')
10142 search_path = concat (".", dirname_separator_string,
10143 debug_file_directory, NULL);
10145 search_path = xstrdup (".");
10148 search_path = xstrdup (debug_file_directory);
10150 flags = OPF_RETURN_REALPATH;
10152 flags |= OPF_SEARCH_IN_PATH;
10153 desc = openp (search_path, flags, file_name,
10154 O_RDONLY | O_BINARY, &absolute_name);
10155 xfree (search_path);
10159 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
10160 xfree (absolute_name);
10161 if (sym_bfd == NULL)
10163 bfd_set_cacheable (sym_bfd, 1);
10165 if (!bfd_check_format (sym_bfd, bfd_object))
10167 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
10171 /* Success. Record the bfd as having been included by the objfile's bfd.
10172 This is important because things like demangled_names_hash lives in the
10173 objfile's per_bfd space and may have references to things like symbol
10174 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10175 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd);
10180 /* Try to open DWO file FILE_NAME.
10181 COMP_DIR is the DW_AT_comp_dir attribute.
10182 The result is the bfd handle of the file.
10183 If there is a problem finding or opening the file, return NULL.
10184 Upon success, the canonicalized path of the file is stored in the bfd,
10185 same as symfile_bfd_open. */
10188 open_dwo_file (const char *file_name, const char *comp_dir)
10192 if (IS_ABSOLUTE_PATH (file_name))
10193 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10195 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10197 if (comp_dir != NULL)
10199 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
10201 /* NOTE: If comp_dir is a relative path, this will also try the
10202 search path, which seems useful. */
10203 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
10204 xfree (path_to_try);
10209 /* That didn't work, try debug-file-directory, which, despite its name,
10210 is a list of paths. */
10212 if (*debug_file_directory == '\0')
10215 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10218 /* This function is mapped across the sections and remembers the offset and
10219 size of each of the DWO debugging sections we are interested in. */
10222 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10224 struct dwo_sections *dwo_sections = dwo_sections_ptr;
10225 const struct dwop_section_names *names = &dwop_section_names;
10227 if (section_is_p (sectp->name, &names->abbrev_dwo))
10229 dwo_sections->abbrev.s.asection = sectp;
10230 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10232 else if (section_is_p (sectp->name, &names->info_dwo))
10234 dwo_sections->info.s.asection = sectp;
10235 dwo_sections->info.size = bfd_get_section_size (sectp);
10237 else if (section_is_p (sectp->name, &names->line_dwo))
10239 dwo_sections->line.s.asection = sectp;
10240 dwo_sections->line.size = bfd_get_section_size (sectp);
10242 else if (section_is_p (sectp->name, &names->loc_dwo))
10244 dwo_sections->loc.s.asection = sectp;
10245 dwo_sections->loc.size = bfd_get_section_size (sectp);
10247 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10249 dwo_sections->macinfo.s.asection = sectp;
10250 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10252 else if (section_is_p (sectp->name, &names->macro_dwo))
10254 dwo_sections->macro.s.asection = sectp;
10255 dwo_sections->macro.size = bfd_get_section_size (sectp);
10257 else if (section_is_p (sectp->name, &names->str_dwo))
10259 dwo_sections->str.s.asection = sectp;
10260 dwo_sections->str.size = bfd_get_section_size (sectp);
10262 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10264 dwo_sections->str_offsets.s.asection = sectp;
10265 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10267 else if (section_is_p (sectp->name, &names->types_dwo))
10269 struct dwarf2_section_info type_section;
10271 memset (&type_section, 0, sizeof (type_section));
10272 type_section.s.asection = sectp;
10273 type_section.size = bfd_get_section_size (sectp);
10274 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10279 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10280 by PER_CU. This is for the non-DWP case.
10281 The result is NULL if DWO_NAME can't be found. */
10283 static struct dwo_file *
10284 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10285 const char *dwo_name, const char *comp_dir)
10287 struct objfile *objfile = dwarf2_per_objfile->objfile;
10288 struct dwo_file *dwo_file;
10290 struct cleanup *cleanups;
10292 dbfd = open_dwo_file (dwo_name, comp_dir);
10295 if (dwarf2_read_debug)
10296 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10299 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10300 dwo_file->dwo_name = dwo_name;
10301 dwo_file->comp_dir = comp_dir;
10302 dwo_file->dbfd = dbfd;
10304 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10306 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
10308 dwo_file->cu = create_dwo_cu (dwo_file);
10310 dwo_file->tus = create_debug_types_hash_table (dwo_file,
10311 dwo_file->sections.types);
10313 discard_cleanups (cleanups);
10315 if (dwarf2_read_debug)
10316 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10321 /* This function is mapped across the sections and remembers the offset and
10322 size of each of the DWP debugging sections common to version 1 and 2 that
10323 we are interested in. */
10326 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10327 void *dwp_file_ptr)
10329 struct dwp_file *dwp_file = dwp_file_ptr;
10330 const struct dwop_section_names *names = &dwop_section_names;
10331 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10333 /* Record the ELF section number for later lookup: this is what the
10334 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10335 gdb_assert (elf_section_nr < dwp_file->num_sections);
10336 dwp_file->elf_sections[elf_section_nr] = sectp;
10338 /* Look for specific sections that we need. */
10339 if (section_is_p (sectp->name, &names->str_dwo))
10341 dwp_file->sections.str.s.asection = sectp;
10342 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10344 else if (section_is_p (sectp->name, &names->cu_index))
10346 dwp_file->sections.cu_index.s.asection = sectp;
10347 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10349 else if (section_is_p (sectp->name, &names->tu_index))
10351 dwp_file->sections.tu_index.s.asection = sectp;
10352 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10356 /* This function is mapped across the sections and remembers the offset and
10357 size of each of the DWP version 2 debugging sections that we are interested
10358 in. This is split into a separate function because we don't know if we
10359 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10362 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10364 struct dwp_file *dwp_file = dwp_file_ptr;
10365 const struct dwop_section_names *names = &dwop_section_names;
10366 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10368 /* Record the ELF section number for later lookup: this is what the
10369 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10370 gdb_assert (elf_section_nr < dwp_file->num_sections);
10371 dwp_file->elf_sections[elf_section_nr] = sectp;
10373 /* Look for specific sections that we need. */
10374 if (section_is_p (sectp->name, &names->abbrev_dwo))
10376 dwp_file->sections.abbrev.s.asection = sectp;
10377 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
10379 else if (section_is_p (sectp->name, &names->info_dwo))
10381 dwp_file->sections.info.s.asection = sectp;
10382 dwp_file->sections.info.size = bfd_get_section_size (sectp);
10384 else if (section_is_p (sectp->name, &names->line_dwo))
10386 dwp_file->sections.line.s.asection = sectp;
10387 dwp_file->sections.line.size = bfd_get_section_size (sectp);
10389 else if (section_is_p (sectp->name, &names->loc_dwo))
10391 dwp_file->sections.loc.s.asection = sectp;
10392 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
10394 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10396 dwp_file->sections.macinfo.s.asection = sectp;
10397 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
10399 else if (section_is_p (sectp->name, &names->macro_dwo))
10401 dwp_file->sections.macro.s.asection = sectp;
10402 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
10404 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10406 dwp_file->sections.str_offsets.s.asection = sectp;
10407 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
10409 else if (section_is_p (sectp->name, &names->types_dwo))
10411 dwp_file->sections.types.s.asection = sectp;
10412 dwp_file->sections.types.size = bfd_get_section_size (sectp);
10416 /* Hash function for dwp_file loaded CUs/TUs. */
10419 hash_dwp_loaded_cutus (const void *item)
10421 const struct dwo_unit *dwo_unit = item;
10423 /* This drops the top 32 bits of the signature, but is ok for a hash. */
10424 return dwo_unit->signature;
10427 /* Equality function for dwp_file loaded CUs/TUs. */
10430 eq_dwp_loaded_cutus (const void *a, const void *b)
10432 const struct dwo_unit *dua = a;
10433 const struct dwo_unit *dub = b;
10435 return dua->signature == dub->signature;
10438 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
10441 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
10443 return htab_create_alloc_ex (3,
10444 hash_dwp_loaded_cutus,
10445 eq_dwp_loaded_cutus,
10447 &objfile->objfile_obstack,
10448 hashtab_obstack_allocate,
10449 dummy_obstack_deallocate);
10452 /* Try to open DWP file FILE_NAME.
10453 The result is the bfd handle of the file.
10454 If there is a problem finding or opening the file, return NULL.
10455 Upon success, the canonicalized path of the file is stored in the bfd,
10456 same as symfile_bfd_open. */
10459 open_dwp_file (const char *file_name)
10463 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
10467 /* Work around upstream bug 15652.
10468 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
10469 [Whether that's a "bug" is debatable, but it is getting in our way.]
10470 We have no real idea where the dwp file is, because gdb's realpath-ing
10471 of the executable's path may have discarded the needed info.
10472 [IWBN if the dwp file name was recorded in the executable, akin to
10473 .gnu_debuglink, but that doesn't exist yet.]
10474 Strip the directory from FILE_NAME and search again. */
10475 if (*debug_file_directory != '\0')
10477 /* Don't implicitly search the current directory here.
10478 If the user wants to search "." to handle this case,
10479 it must be added to debug-file-directory. */
10480 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
10487 /* Initialize the use of the DWP file for the current objfile.
10488 By convention the name of the DWP file is ${objfile}.dwp.
10489 The result is NULL if it can't be found. */
10491 static struct dwp_file *
10492 open_and_init_dwp_file (void)
10494 struct objfile *objfile = dwarf2_per_objfile->objfile;
10495 struct dwp_file *dwp_file;
10498 struct cleanup *cleanups;
10500 /* Try to find first .dwp for the binary file before any symbolic links
10502 dwp_name = xstrprintf ("%s.dwp", objfile->original_name);
10503 cleanups = make_cleanup (xfree, dwp_name);
10505 dbfd = open_dwp_file (dwp_name);
10507 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
10509 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
10510 dwp_name = xstrprintf ("%s.dwp", objfile_name (objfile));
10511 make_cleanup (xfree, dwp_name);
10512 dbfd = open_dwp_file (dwp_name);
10517 if (dwarf2_read_debug)
10518 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
10519 do_cleanups (cleanups);
10522 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
10523 dwp_file->name = bfd_get_filename (dbfd);
10524 dwp_file->dbfd = dbfd;
10525 do_cleanups (cleanups);
10527 /* +1: section 0 is unused */
10528 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
10529 dwp_file->elf_sections =
10530 OBSTACK_CALLOC (&objfile->objfile_obstack,
10531 dwp_file->num_sections, asection *);
10533 bfd_map_over_sections (dbfd, dwarf2_locate_common_dwp_sections, dwp_file);
10535 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
10537 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
10539 /* The DWP file version is stored in the hash table. Oh well. */
10540 if (dwp_file->cus->version != dwp_file->tus->version)
10542 /* Technically speaking, we should try to limp along, but this is
10543 pretty bizarre. We use pulongest here because that's the established
10544 portability solution (e.g, we cannot use %u for uint32_t). */
10545 error (_("Dwarf Error: DWP file CU version %s doesn't match"
10546 " TU version %s [in DWP file %s]"),
10547 pulongest (dwp_file->cus->version),
10548 pulongest (dwp_file->tus->version), dwp_name);
10550 dwp_file->version = dwp_file->cus->version;
10552 if (dwp_file->version == 2)
10553 bfd_map_over_sections (dbfd, dwarf2_locate_v2_dwp_sections, dwp_file);
10555 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
10556 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
10558 if (dwarf2_read_debug)
10560 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
10561 fprintf_unfiltered (gdb_stdlog,
10562 " %s CUs, %s TUs\n",
10563 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
10564 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
10570 /* Wrapper around open_and_init_dwp_file, only open it once. */
10572 static struct dwp_file *
10573 get_dwp_file (void)
10575 if (! dwarf2_per_objfile->dwp_checked)
10577 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
10578 dwarf2_per_objfile->dwp_checked = 1;
10580 return dwarf2_per_objfile->dwp_file;
10583 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
10584 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
10585 or in the DWP file for the objfile, referenced by THIS_UNIT.
10586 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
10587 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
10589 This is called, for example, when wanting to read a variable with a
10590 complex location. Therefore we don't want to do file i/o for every call.
10591 Therefore we don't want to look for a DWO file on every call.
10592 Therefore we first see if we've already seen SIGNATURE in a DWP file,
10593 then we check if we've already seen DWO_NAME, and only THEN do we check
10596 The result is a pointer to the dwo_unit object or NULL if we didn't find it
10597 (dwo_id mismatch or couldn't find the DWO/DWP file). */
10599 static struct dwo_unit *
10600 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
10601 const char *dwo_name, const char *comp_dir,
10602 ULONGEST signature, int is_debug_types)
10604 struct objfile *objfile = dwarf2_per_objfile->objfile;
10605 const char *kind = is_debug_types ? "TU" : "CU";
10606 void **dwo_file_slot;
10607 struct dwo_file *dwo_file;
10608 struct dwp_file *dwp_file;
10610 /* First see if there's a DWP file.
10611 If we have a DWP file but didn't find the DWO inside it, don't
10612 look for the original DWO file. It makes gdb behave differently
10613 depending on whether one is debugging in the build tree. */
10615 dwp_file = get_dwp_file ();
10616 if (dwp_file != NULL)
10618 const struct dwp_hash_table *dwp_htab =
10619 is_debug_types ? dwp_file->tus : dwp_file->cus;
10621 if (dwp_htab != NULL)
10623 struct dwo_unit *dwo_cutu =
10624 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
10625 signature, is_debug_types);
10627 if (dwo_cutu != NULL)
10629 if (dwarf2_read_debug)
10631 fprintf_unfiltered (gdb_stdlog,
10632 "Virtual DWO %s %s found: @%s\n",
10633 kind, hex_string (signature),
10634 host_address_to_string (dwo_cutu));
10642 /* No DWP file, look for the DWO file. */
10644 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
10645 if (*dwo_file_slot == NULL)
10647 /* Read in the file and build a table of the CUs/TUs it contains. */
10648 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
10650 /* NOTE: This will be NULL if unable to open the file. */
10651 dwo_file = *dwo_file_slot;
10653 if (dwo_file != NULL)
10655 struct dwo_unit *dwo_cutu = NULL;
10657 if (is_debug_types && dwo_file->tus)
10659 struct dwo_unit find_dwo_cutu;
10661 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
10662 find_dwo_cutu.signature = signature;
10663 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
10665 else if (!is_debug_types && dwo_file->cu)
10667 if (signature == dwo_file->cu->signature)
10668 dwo_cutu = dwo_file->cu;
10671 if (dwo_cutu != NULL)
10673 if (dwarf2_read_debug)
10675 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
10676 kind, dwo_name, hex_string (signature),
10677 host_address_to_string (dwo_cutu));
10684 /* We didn't find it. This could mean a dwo_id mismatch, or
10685 someone deleted the DWO/DWP file, or the search path isn't set up
10686 correctly to find the file. */
10688 if (dwarf2_read_debug)
10690 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
10691 kind, dwo_name, hex_string (signature));
10694 /* This is a warning and not a complaint because it can be caused by
10695 pilot error (e.g., user accidentally deleting the DWO). */
10697 /* Print the name of the DWP file if we looked there, helps the user
10698 better diagnose the problem. */
10699 char *dwp_text = NULL;
10700 struct cleanup *cleanups;
10702 if (dwp_file != NULL)
10703 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
10704 cleanups = make_cleanup (xfree, dwp_text);
10706 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
10707 " [in module %s]"),
10708 kind, dwo_name, hex_string (signature),
10709 dwp_text != NULL ? dwp_text : "",
10710 this_unit->is_debug_types ? "TU" : "CU",
10711 this_unit->offset.sect_off, objfile_name (objfile));
10713 do_cleanups (cleanups);
10718 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
10719 See lookup_dwo_cutu_unit for details. */
10721 static struct dwo_unit *
10722 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
10723 const char *dwo_name, const char *comp_dir,
10724 ULONGEST signature)
10726 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
10729 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
10730 See lookup_dwo_cutu_unit for details. */
10732 static struct dwo_unit *
10733 lookup_dwo_type_unit (struct signatured_type *this_tu,
10734 const char *dwo_name, const char *comp_dir)
10736 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
10739 /* Traversal function for queue_and_load_all_dwo_tus. */
10742 queue_and_load_dwo_tu (void **slot, void *info)
10744 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
10745 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
10746 ULONGEST signature = dwo_unit->signature;
10747 struct signatured_type *sig_type =
10748 lookup_dwo_signatured_type (per_cu->cu, signature);
10750 if (sig_type != NULL)
10752 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
10754 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
10755 a real dependency of PER_CU on SIG_TYPE. That is detected later
10756 while processing PER_CU. */
10757 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
10758 load_full_type_unit (sig_cu);
10759 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
10765 /* Queue all TUs contained in the DWO of PER_CU to be read in.
10766 The DWO may have the only definition of the type, though it may not be
10767 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
10768 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
10771 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
10773 struct dwo_unit *dwo_unit;
10774 struct dwo_file *dwo_file;
10776 gdb_assert (!per_cu->is_debug_types);
10777 gdb_assert (get_dwp_file () == NULL);
10778 gdb_assert (per_cu->cu != NULL);
10780 dwo_unit = per_cu->cu->dwo_unit;
10781 gdb_assert (dwo_unit != NULL);
10783 dwo_file = dwo_unit->dwo_file;
10784 if (dwo_file->tus != NULL)
10785 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
10788 /* Free all resources associated with DWO_FILE.
10789 Close the DWO file and munmap the sections.
10790 All memory should be on the objfile obstack. */
10793 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
10796 struct dwarf2_section_info *section;
10798 /* Note: dbfd is NULL for virtual DWO files. */
10799 gdb_bfd_unref (dwo_file->dbfd);
10801 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
10804 /* Wrapper for free_dwo_file for use in cleanups. */
10807 free_dwo_file_cleanup (void *arg)
10809 struct dwo_file *dwo_file = (struct dwo_file *) arg;
10810 struct objfile *objfile = dwarf2_per_objfile->objfile;
10812 free_dwo_file (dwo_file, objfile);
10815 /* Traversal function for free_dwo_files. */
10818 free_dwo_file_from_slot (void **slot, void *info)
10820 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
10821 struct objfile *objfile = (struct objfile *) info;
10823 free_dwo_file (dwo_file, objfile);
10828 /* Free all resources associated with DWO_FILES. */
10831 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
10833 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
10836 /* Read in various DIEs. */
10838 /* qsort helper for inherit_abstract_dies. */
10841 unsigned_int_compar (const void *ap, const void *bp)
10843 unsigned int a = *(unsigned int *) ap;
10844 unsigned int b = *(unsigned int *) bp;
10846 return (a > b) - (b > a);
10849 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
10850 Inherit only the children of the DW_AT_abstract_origin DIE not being
10851 already referenced by DW_AT_abstract_origin from the children of the
10855 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
10857 struct die_info *child_die;
10858 unsigned die_children_count;
10859 /* CU offsets which were referenced by children of the current DIE. */
10860 sect_offset *offsets;
10861 sect_offset *offsets_end, *offsetp;
10862 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
10863 struct die_info *origin_die;
10864 /* Iterator of the ORIGIN_DIE children. */
10865 struct die_info *origin_child_die;
10866 struct cleanup *cleanups;
10867 struct attribute *attr;
10868 struct dwarf2_cu *origin_cu;
10869 struct pending **origin_previous_list_in_scope;
10871 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10875 /* Note that following die references may follow to a die in a
10879 origin_die = follow_die_ref (die, attr, &origin_cu);
10881 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
10883 origin_previous_list_in_scope = origin_cu->list_in_scope;
10884 origin_cu->list_in_scope = cu->list_in_scope;
10886 if (die->tag != origin_die->tag
10887 && !(die->tag == DW_TAG_inlined_subroutine
10888 && origin_die->tag == DW_TAG_subprogram))
10889 complaint (&symfile_complaints,
10890 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
10891 die->offset.sect_off, origin_die->offset.sect_off);
10893 child_die = die->child;
10894 die_children_count = 0;
10895 while (child_die && child_die->tag)
10897 child_die = sibling_die (child_die);
10898 die_children_count++;
10900 offsets = xmalloc (sizeof (*offsets) * die_children_count);
10901 cleanups = make_cleanup (xfree, offsets);
10903 offsets_end = offsets;
10904 child_die = die->child;
10905 while (child_die && child_die->tag)
10907 /* For each CHILD_DIE, find the corresponding child of
10908 ORIGIN_DIE. If there is more than one layer of
10909 DW_AT_abstract_origin, follow them all; there shouldn't be,
10910 but GCC versions at least through 4.4 generate this (GCC PR
10912 struct die_info *child_origin_die = child_die;
10913 struct dwarf2_cu *child_origin_cu = cu;
10917 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
10921 child_origin_die = follow_die_ref (child_origin_die, attr,
10925 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
10926 counterpart may exist. */
10927 if (child_origin_die != child_die)
10929 if (child_die->tag != child_origin_die->tag
10930 && !(child_die->tag == DW_TAG_inlined_subroutine
10931 && child_origin_die->tag == DW_TAG_subprogram))
10932 complaint (&symfile_complaints,
10933 _("Child DIE 0x%x and its abstract origin 0x%x have "
10934 "different tags"), child_die->offset.sect_off,
10935 child_origin_die->offset.sect_off);
10936 if (child_origin_die->parent != origin_die)
10937 complaint (&symfile_complaints,
10938 _("Child DIE 0x%x and its abstract origin 0x%x have "
10939 "different parents"), child_die->offset.sect_off,
10940 child_origin_die->offset.sect_off);
10942 *offsets_end++ = child_origin_die->offset;
10944 child_die = sibling_die (child_die);
10946 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
10947 unsigned_int_compar);
10948 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
10949 if (offsetp[-1].sect_off == offsetp->sect_off)
10950 complaint (&symfile_complaints,
10951 _("Multiple children of DIE 0x%x refer "
10952 "to DIE 0x%x as their abstract origin"),
10953 die->offset.sect_off, offsetp->sect_off);
10956 origin_child_die = origin_die->child;
10957 while (origin_child_die && origin_child_die->tag)
10959 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
10960 while (offsetp < offsets_end
10961 && offsetp->sect_off < origin_child_die->offset.sect_off)
10963 if (offsetp >= offsets_end
10964 || offsetp->sect_off > origin_child_die->offset.sect_off)
10966 /* Found that ORIGIN_CHILD_DIE is really not referenced.
10967 Check whether we're already processing ORIGIN_CHILD_DIE.
10968 This can happen with mutually referenced abstract_origins.
10970 if (!origin_child_die->in_process)
10971 process_die (origin_child_die, origin_cu);
10973 origin_child_die = sibling_die (origin_child_die);
10975 origin_cu->list_in_scope = origin_previous_list_in_scope;
10977 do_cleanups (cleanups);
10981 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
10983 struct objfile *objfile = cu->objfile;
10984 struct context_stack *new;
10987 struct die_info *child_die;
10988 struct attribute *attr, *call_line, *call_file;
10990 CORE_ADDR baseaddr;
10991 struct block *block;
10992 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
10993 VEC (symbolp) *template_args = NULL;
10994 struct template_symbol *templ_func = NULL;
10998 /* If we do not have call site information, we can't show the
10999 caller of this inlined function. That's too confusing, so
11000 only use the scope for local variables. */
11001 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11002 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11003 if (call_line == NULL || call_file == NULL)
11005 read_lexical_block_scope (die, cu);
11010 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11012 name = dwarf2_name (die, cu);
11014 /* Ignore functions with missing or empty names. These are actually
11015 illegal according to the DWARF standard. */
11018 complaint (&symfile_complaints,
11019 _("missing name for subprogram DIE at %d"),
11020 die->offset.sect_off);
11024 /* Ignore functions with missing or invalid low and high pc attributes. */
11025 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11027 attr = dwarf2_attr (die, DW_AT_external, cu);
11028 if (!attr || !DW_UNSND (attr))
11029 complaint (&symfile_complaints,
11030 _("cannot get low and high bounds "
11031 "for subprogram DIE at %d"),
11032 die->offset.sect_off);
11037 highpc += baseaddr;
11039 /* If we have any template arguments, then we must allocate a
11040 different sort of symbol. */
11041 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11043 if (child_die->tag == DW_TAG_template_type_param
11044 || child_die->tag == DW_TAG_template_value_param)
11046 templ_func = allocate_template_symbol (objfile);
11047 templ_func->base.is_cplus_template_function = 1;
11052 new = push_context (0, lowpc);
11053 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
11054 (struct symbol *) templ_func);
11056 /* If there is a location expression for DW_AT_frame_base, record
11058 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11060 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
11062 cu->list_in_scope = &local_symbols;
11064 if (die->child != NULL)
11066 child_die = die->child;
11067 while (child_die && child_die->tag)
11069 if (child_die->tag == DW_TAG_template_type_param
11070 || child_die->tag == DW_TAG_template_value_param)
11072 struct symbol *arg = new_symbol (child_die, NULL, cu);
11075 VEC_safe_push (symbolp, template_args, arg);
11078 process_die (child_die, cu);
11079 child_die = sibling_die (child_die);
11083 inherit_abstract_dies (die, cu);
11085 /* If we have a DW_AT_specification, we might need to import using
11086 directives from the context of the specification DIE. See the
11087 comment in determine_prefix. */
11088 if (cu->language == language_cplus
11089 && dwarf2_attr (die, DW_AT_specification, cu))
11091 struct dwarf2_cu *spec_cu = cu;
11092 struct die_info *spec_die = die_specification (die, &spec_cu);
11096 child_die = spec_die->child;
11097 while (child_die && child_die->tag)
11099 if (child_die->tag == DW_TAG_imported_module)
11100 process_die (child_die, spec_cu);
11101 child_die = sibling_die (child_die);
11104 /* In some cases, GCC generates specification DIEs that
11105 themselves contain DW_AT_specification attributes. */
11106 spec_die = die_specification (spec_die, &spec_cu);
11110 new = pop_context ();
11111 /* Make a block for the local symbols within. */
11112 block = finish_block (new->name, &local_symbols, new->old_blocks,
11113 lowpc, highpc, objfile);
11115 /* For C++, set the block's scope. */
11116 if ((cu->language == language_cplus || cu->language == language_fortran)
11117 && cu->processing_has_namespace_info)
11118 block_set_scope (block, determine_prefix (die, cu),
11119 &objfile->objfile_obstack);
11121 /* If we have address ranges, record them. */
11122 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11124 /* Attach template arguments to function. */
11125 if (! VEC_empty (symbolp, template_args))
11127 gdb_assert (templ_func != NULL);
11129 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11130 templ_func->template_arguments
11131 = obstack_alloc (&objfile->objfile_obstack,
11132 (templ_func->n_template_arguments
11133 * sizeof (struct symbol *)));
11134 memcpy (templ_func->template_arguments,
11135 VEC_address (symbolp, template_args),
11136 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11137 VEC_free (symbolp, template_args);
11140 /* In C++, we can have functions nested inside functions (e.g., when
11141 a function declares a class that has methods). This means that
11142 when we finish processing a function scope, we may need to go
11143 back to building a containing block's symbol lists. */
11144 local_symbols = new->locals;
11145 using_directives = new->using_directives;
11147 /* If we've finished processing a top-level function, subsequent
11148 symbols go in the file symbol list. */
11149 if (outermost_context_p ())
11150 cu->list_in_scope = &file_symbols;
11153 /* Process all the DIES contained within a lexical block scope. Start
11154 a new scope, process the dies, and then close the scope. */
11157 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11159 struct objfile *objfile = cu->objfile;
11160 struct context_stack *new;
11161 CORE_ADDR lowpc, highpc;
11162 struct die_info *child_die;
11163 CORE_ADDR baseaddr;
11165 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11167 /* Ignore blocks with missing or invalid low and high pc attributes. */
11168 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11169 as multiple lexical blocks? Handling children in a sane way would
11170 be nasty. Might be easier to properly extend generic blocks to
11171 describe ranges. */
11172 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11175 highpc += baseaddr;
11177 push_context (0, lowpc);
11178 if (die->child != NULL)
11180 child_die = die->child;
11181 while (child_die && child_die->tag)
11183 process_die (child_die, cu);
11184 child_die = sibling_die (child_die);
11187 new = pop_context ();
11189 if (local_symbols != NULL || using_directives != NULL)
11191 struct block *block
11192 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
11195 /* Note that recording ranges after traversing children, as we
11196 do here, means that recording a parent's ranges entails
11197 walking across all its children's ranges as they appear in
11198 the address map, which is quadratic behavior.
11200 It would be nicer to record the parent's ranges before
11201 traversing its children, simply overriding whatever you find
11202 there. But since we don't even decide whether to create a
11203 block until after we've traversed its children, that's hard
11205 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11207 local_symbols = new->locals;
11208 using_directives = new->using_directives;
11211 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
11214 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11216 struct objfile *objfile = cu->objfile;
11217 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11218 CORE_ADDR pc, baseaddr;
11219 struct attribute *attr;
11220 struct call_site *call_site, call_site_local;
11223 struct die_info *child_die;
11225 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11227 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11230 complaint (&symfile_complaints,
11231 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
11232 "DIE 0x%x [in module %s]"),
11233 die->offset.sect_off, objfile_name (objfile));
11236 pc = attr_value_as_address (attr) + baseaddr;
11238 if (cu->call_site_htab == NULL)
11239 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11240 NULL, &objfile->objfile_obstack,
11241 hashtab_obstack_allocate, NULL);
11242 call_site_local.pc = pc;
11243 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11246 complaint (&symfile_complaints,
11247 _("Duplicate PC %s for DW_TAG_GNU_call_site "
11248 "DIE 0x%x [in module %s]"),
11249 paddress (gdbarch, pc), die->offset.sect_off,
11250 objfile_name (objfile));
11254 /* Count parameters at the caller. */
11257 for (child_die = die->child; child_die && child_die->tag;
11258 child_die = sibling_die (child_die))
11260 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11262 complaint (&symfile_complaints,
11263 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
11264 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11265 child_die->tag, child_die->offset.sect_off,
11266 objfile_name (objfile));
11273 call_site = obstack_alloc (&objfile->objfile_obstack,
11274 (sizeof (*call_site)
11275 + (sizeof (*call_site->parameter)
11276 * (nparams - 1))));
11278 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11279 call_site->pc = pc;
11281 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11283 struct die_info *func_die;
11285 /* Skip also over DW_TAG_inlined_subroutine. */
11286 for (func_die = die->parent;
11287 func_die && func_die->tag != DW_TAG_subprogram
11288 && func_die->tag != DW_TAG_subroutine_type;
11289 func_die = func_die->parent);
11291 /* DW_AT_GNU_all_call_sites is a superset
11292 of DW_AT_GNU_all_tail_call_sites. */
11294 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11295 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11297 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11298 not complete. But keep CALL_SITE for look ups via call_site_htab,
11299 both the initial caller containing the real return address PC and
11300 the final callee containing the current PC of a chain of tail
11301 calls do not need to have the tail call list complete. But any
11302 function candidate for a virtual tail call frame searched via
11303 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11304 determined unambiguously. */
11308 struct type *func_type = NULL;
11311 func_type = get_die_type (func_die, cu);
11312 if (func_type != NULL)
11314 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
11316 /* Enlist this call site to the function. */
11317 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
11318 TYPE_TAIL_CALL_LIST (func_type) = call_site;
11321 complaint (&symfile_complaints,
11322 _("Cannot find function owning DW_TAG_GNU_call_site "
11323 "DIE 0x%x [in module %s]"),
11324 die->offset.sect_off, objfile_name (objfile));
11328 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
11330 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11331 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
11332 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
11333 /* Keep NULL DWARF_BLOCK. */;
11334 else if (attr_form_is_block (attr))
11336 struct dwarf2_locexpr_baton *dlbaton;
11338 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
11339 dlbaton->data = DW_BLOCK (attr)->data;
11340 dlbaton->size = DW_BLOCK (attr)->size;
11341 dlbaton->per_cu = cu->per_cu;
11343 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
11345 else if (attr_form_is_ref (attr))
11347 struct dwarf2_cu *target_cu = cu;
11348 struct die_info *target_die;
11350 target_die = follow_die_ref (die, attr, &target_cu);
11351 gdb_assert (target_cu->objfile == objfile);
11352 if (die_is_declaration (target_die, target_cu))
11354 const char *target_physname = NULL;
11355 struct attribute *target_attr;
11357 /* Prefer the mangled name; otherwise compute the demangled one. */
11358 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
11359 if (target_attr == NULL)
11360 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
11362 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
11363 target_physname = DW_STRING (target_attr);
11365 target_physname = dwarf2_physname (NULL, target_die, target_cu);
11366 if (target_physname == NULL)
11367 complaint (&symfile_complaints,
11368 _("DW_AT_GNU_call_site_target target DIE has invalid "
11369 "physname, for referencing DIE 0x%x [in module %s]"),
11370 die->offset.sect_off, objfile_name (objfile));
11372 SET_FIELD_PHYSNAME (call_site->target, target_physname);
11378 /* DW_AT_entry_pc should be preferred. */
11379 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
11380 complaint (&symfile_complaints,
11381 _("DW_AT_GNU_call_site_target target DIE has invalid "
11382 "low pc, for referencing DIE 0x%x [in module %s]"),
11383 die->offset.sect_off, objfile_name (objfile));
11385 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
11389 complaint (&symfile_complaints,
11390 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
11391 "block nor reference, for DIE 0x%x [in module %s]"),
11392 die->offset.sect_off, objfile_name (objfile));
11394 call_site->per_cu = cu->per_cu;
11396 for (child_die = die->child;
11397 child_die && child_die->tag;
11398 child_die = sibling_die (child_die))
11400 struct call_site_parameter *parameter;
11401 struct attribute *loc, *origin;
11403 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11405 /* Already printed the complaint above. */
11409 gdb_assert (call_site->parameter_count < nparams);
11410 parameter = &call_site->parameter[call_site->parameter_count];
11412 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
11413 specifies DW_TAG_formal_parameter. Value of the data assumed for the
11414 register is contained in DW_AT_GNU_call_site_value. */
11416 loc = dwarf2_attr (child_die, DW_AT_location, cu);
11417 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
11418 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
11420 sect_offset offset;
11422 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
11423 offset = dwarf2_get_ref_die_offset (origin);
11424 if (!offset_in_cu_p (&cu->header, offset))
11426 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
11427 binding can be done only inside one CU. Such referenced DIE
11428 therefore cannot be even moved to DW_TAG_partial_unit. */
11429 complaint (&symfile_complaints,
11430 _("DW_AT_abstract_origin offset is not in CU for "
11431 "DW_TAG_GNU_call_site child DIE 0x%x "
11433 child_die->offset.sect_off, objfile_name (objfile));
11436 parameter->u.param_offset.cu_off = (offset.sect_off
11437 - cu->header.offset.sect_off);
11439 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
11441 complaint (&symfile_complaints,
11442 _("No DW_FORM_block* DW_AT_location for "
11443 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11444 child_die->offset.sect_off, objfile_name (objfile));
11449 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
11450 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
11451 if (parameter->u.dwarf_reg != -1)
11452 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
11453 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
11454 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
11455 ¶meter->u.fb_offset))
11456 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
11459 complaint (&symfile_complaints,
11460 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
11461 "for DW_FORM_block* DW_AT_location is supported for "
11462 "DW_TAG_GNU_call_site child DIE 0x%x "
11464 child_die->offset.sect_off, objfile_name (objfile));
11469 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
11470 if (!attr_form_is_block (attr))
11472 complaint (&symfile_complaints,
11473 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
11474 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11475 child_die->offset.sect_off, objfile_name (objfile));
11478 parameter->value = DW_BLOCK (attr)->data;
11479 parameter->value_size = DW_BLOCK (attr)->size;
11481 /* Parameters are not pre-cleared by memset above. */
11482 parameter->data_value = NULL;
11483 parameter->data_value_size = 0;
11484 call_site->parameter_count++;
11486 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
11489 if (!attr_form_is_block (attr))
11490 complaint (&symfile_complaints,
11491 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
11492 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11493 child_die->offset.sect_off, objfile_name (objfile));
11496 parameter->data_value = DW_BLOCK (attr)->data;
11497 parameter->data_value_size = DW_BLOCK (attr)->size;
11503 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
11504 Return 1 if the attributes are present and valid, otherwise, return 0.
11505 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
11508 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
11509 CORE_ADDR *high_return, struct dwarf2_cu *cu,
11510 struct partial_symtab *ranges_pst)
11512 struct objfile *objfile = cu->objfile;
11513 struct comp_unit_head *cu_header = &cu->header;
11514 bfd *obfd = objfile->obfd;
11515 unsigned int addr_size = cu_header->addr_size;
11516 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
11517 /* Base address selection entry. */
11520 unsigned int dummy;
11521 const gdb_byte *buffer;
11525 CORE_ADDR high = 0;
11526 CORE_ADDR baseaddr;
11528 found_base = cu->base_known;
11529 base = cu->base_address;
11531 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
11532 if (offset >= dwarf2_per_objfile->ranges.size)
11534 complaint (&symfile_complaints,
11535 _("Offset %d out of bounds for DW_AT_ranges attribute"),
11539 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11541 /* Read in the largest possible address. */
11542 marker = read_address (obfd, buffer, cu, &dummy);
11543 if ((marker & mask) == mask)
11545 /* If we found the largest possible address, then
11546 read the base address. */
11547 base = read_address (obfd, buffer + addr_size, cu, &dummy);
11548 buffer += 2 * addr_size;
11549 offset += 2 * addr_size;
11555 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11559 CORE_ADDR range_beginning, range_end;
11561 range_beginning = read_address (obfd, buffer, cu, &dummy);
11562 buffer += addr_size;
11563 range_end = read_address (obfd, buffer, cu, &dummy);
11564 buffer += addr_size;
11565 offset += 2 * addr_size;
11567 /* An end of list marker is a pair of zero addresses. */
11568 if (range_beginning == 0 && range_end == 0)
11569 /* Found the end of list entry. */
11572 /* Each base address selection entry is a pair of 2 values.
11573 The first is the largest possible address, the second is
11574 the base address. Check for a base address here. */
11575 if ((range_beginning & mask) == mask)
11577 /* If we found the largest possible address, then
11578 read the base address. */
11579 base = read_address (obfd, buffer + addr_size, cu, &dummy);
11586 /* We have no valid base address for the ranges
11588 complaint (&symfile_complaints,
11589 _("Invalid .debug_ranges data (no base address)"));
11593 if (range_beginning > range_end)
11595 /* Inverted range entries are invalid. */
11596 complaint (&symfile_complaints,
11597 _("Invalid .debug_ranges data (inverted range)"));
11601 /* Empty range entries have no effect. */
11602 if (range_beginning == range_end)
11605 range_beginning += base;
11608 /* A not-uncommon case of bad debug info.
11609 Don't pollute the addrmap with bad data. */
11610 if (range_beginning + baseaddr == 0
11611 && !dwarf2_per_objfile->has_section_at_zero)
11613 complaint (&symfile_complaints,
11614 _(".debug_ranges entry has start address of zero"
11615 " [in module %s]"), objfile_name (objfile));
11619 if (ranges_pst != NULL)
11620 addrmap_set_empty (objfile->psymtabs_addrmap,
11621 range_beginning + baseaddr,
11622 range_end - 1 + baseaddr,
11625 /* FIXME: This is recording everything as a low-high
11626 segment of consecutive addresses. We should have a
11627 data structure for discontiguous block ranges
11631 low = range_beginning;
11637 if (range_beginning < low)
11638 low = range_beginning;
11639 if (range_end > high)
11645 /* If the first entry is an end-of-list marker, the range
11646 describes an empty scope, i.e. no instructions. */
11652 *high_return = high;
11656 /* Get low and high pc attributes from a die. Return 1 if the attributes
11657 are present and valid, otherwise, return 0. Return -1 if the range is
11658 discontinuous, i.e. derived from DW_AT_ranges information. */
11661 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
11662 CORE_ADDR *highpc, struct dwarf2_cu *cu,
11663 struct partial_symtab *pst)
11665 struct attribute *attr;
11666 struct attribute *attr_high;
11668 CORE_ADDR high = 0;
11671 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
11674 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11677 low = attr_value_as_address (attr);
11678 high = attr_value_as_address (attr_high);
11679 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
11683 /* Found high w/o low attribute. */
11686 /* Found consecutive range of addresses. */
11691 attr = dwarf2_attr (die, DW_AT_ranges, cu);
11694 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
11695 We take advantage of the fact that DW_AT_ranges does not appear
11696 in DW_TAG_compile_unit of DWO files. */
11697 int need_ranges_base = die->tag != DW_TAG_compile_unit;
11698 unsigned int ranges_offset = (DW_UNSND (attr)
11699 + (need_ranges_base
11703 /* Value of the DW_AT_ranges attribute is the offset in the
11704 .debug_ranges section. */
11705 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
11707 /* Found discontinuous range of addresses. */
11712 /* read_partial_die has also the strict LOW < HIGH requirement. */
11716 /* When using the GNU linker, .gnu.linkonce. sections are used to
11717 eliminate duplicate copies of functions and vtables and such.
11718 The linker will arbitrarily choose one and discard the others.
11719 The AT_*_pc values for such functions refer to local labels in
11720 these sections. If the section from that file was discarded, the
11721 labels are not in the output, so the relocs get a value of 0.
11722 If this is a discarded function, mark the pc bounds as invalid,
11723 so that GDB will ignore it. */
11724 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
11733 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
11734 its low and high PC addresses. Do nothing if these addresses could not
11735 be determined. Otherwise, set LOWPC to the low address if it is smaller,
11736 and HIGHPC to the high address if greater than HIGHPC. */
11739 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
11740 CORE_ADDR *lowpc, CORE_ADDR *highpc,
11741 struct dwarf2_cu *cu)
11743 CORE_ADDR low, high;
11744 struct die_info *child = die->child;
11746 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
11748 *lowpc = min (*lowpc, low);
11749 *highpc = max (*highpc, high);
11752 /* If the language does not allow nested subprograms (either inside
11753 subprograms or lexical blocks), we're done. */
11754 if (cu->language != language_ada)
11757 /* Check all the children of the given DIE. If it contains nested
11758 subprograms, then check their pc bounds. Likewise, we need to
11759 check lexical blocks as well, as they may also contain subprogram
11761 while (child && child->tag)
11763 if (child->tag == DW_TAG_subprogram
11764 || child->tag == DW_TAG_lexical_block)
11765 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
11766 child = sibling_die (child);
11770 /* Get the low and high pc's represented by the scope DIE, and store
11771 them in *LOWPC and *HIGHPC. If the correct values can't be
11772 determined, set *LOWPC to -1 and *HIGHPC to 0. */
11775 get_scope_pc_bounds (struct die_info *die,
11776 CORE_ADDR *lowpc, CORE_ADDR *highpc,
11777 struct dwarf2_cu *cu)
11779 CORE_ADDR best_low = (CORE_ADDR) -1;
11780 CORE_ADDR best_high = (CORE_ADDR) 0;
11781 CORE_ADDR current_low, current_high;
11783 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
11785 best_low = current_low;
11786 best_high = current_high;
11790 struct die_info *child = die->child;
11792 while (child && child->tag)
11794 switch (child->tag) {
11795 case DW_TAG_subprogram:
11796 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
11798 case DW_TAG_namespace:
11799 case DW_TAG_module:
11800 /* FIXME: carlton/2004-01-16: Should we do this for
11801 DW_TAG_class_type/DW_TAG_structure_type, too? I think
11802 that current GCC's always emit the DIEs corresponding
11803 to definitions of methods of classes as children of a
11804 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
11805 the DIEs giving the declarations, which could be
11806 anywhere). But I don't see any reason why the
11807 standards says that they have to be there. */
11808 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
11810 if (current_low != ((CORE_ADDR) -1))
11812 best_low = min (best_low, current_low);
11813 best_high = max (best_high, current_high);
11821 child = sibling_die (child);
11826 *highpc = best_high;
11829 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
11833 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
11834 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
11836 struct objfile *objfile = cu->objfile;
11837 struct attribute *attr;
11838 struct attribute *attr_high;
11840 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
11843 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11846 CORE_ADDR low = attr_value_as_address (attr);
11847 CORE_ADDR high = attr_value_as_address (attr_high);
11849 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
11852 record_block_range (block, baseaddr + low, baseaddr + high - 1);
11856 attr = dwarf2_attr (die, DW_AT_ranges, cu);
11859 bfd *obfd = objfile->obfd;
11860 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
11861 We take advantage of the fact that DW_AT_ranges does not appear
11862 in DW_TAG_compile_unit of DWO files. */
11863 int need_ranges_base = die->tag != DW_TAG_compile_unit;
11865 /* The value of the DW_AT_ranges attribute is the offset of the
11866 address range list in the .debug_ranges section. */
11867 unsigned long offset = (DW_UNSND (attr)
11868 + (need_ranges_base ? cu->ranges_base : 0));
11869 const gdb_byte *buffer;
11871 /* For some target architectures, but not others, the
11872 read_address function sign-extends the addresses it returns.
11873 To recognize base address selection entries, we need a
11875 unsigned int addr_size = cu->header.addr_size;
11876 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
11878 /* The base address, to which the next pair is relative. Note
11879 that this 'base' is a DWARF concept: most entries in a range
11880 list are relative, to reduce the number of relocs against the
11881 debugging information. This is separate from this function's
11882 'baseaddr' argument, which GDB uses to relocate debugging
11883 information from a shared library based on the address at
11884 which the library was loaded. */
11885 CORE_ADDR base = cu->base_address;
11886 int base_known = cu->base_known;
11888 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
11889 if (offset >= dwarf2_per_objfile->ranges.size)
11891 complaint (&symfile_complaints,
11892 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
11896 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11900 unsigned int bytes_read;
11901 CORE_ADDR start, end;
11903 start = read_address (obfd, buffer, cu, &bytes_read);
11904 buffer += bytes_read;
11905 end = read_address (obfd, buffer, cu, &bytes_read);
11906 buffer += bytes_read;
11908 /* Did we find the end of the range list? */
11909 if (start == 0 && end == 0)
11912 /* Did we find a base address selection entry? */
11913 else if ((start & base_select_mask) == base_select_mask)
11919 /* We found an ordinary address range. */
11924 complaint (&symfile_complaints,
11925 _("Invalid .debug_ranges data "
11926 "(no base address)"));
11932 /* Inverted range entries are invalid. */
11933 complaint (&symfile_complaints,
11934 _("Invalid .debug_ranges data "
11935 "(inverted range)"));
11939 /* Empty range entries have no effect. */
11943 start += base + baseaddr;
11944 end += base + baseaddr;
11946 /* A not-uncommon case of bad debug info.
11947 Don't pollute the addrmap with bad data. */
11948 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
11950 complaint (&symfile_complaints,
11951 _(".debug_ranges entry has start address of zero"
11952 " [in module %s]"), objfile_name (objfile));
11956 record_block_range (block, start, end - 1);
11962 /* Check whether the producer field indicates either of GCC < 4.6, or the
11963 Intel C/C++ compiler, and cache the result in CU. */
11966 check_producer (struct dwarf2_cu *cu)
11969 int major, minor, release;
11971 if (cu->producer == NULL)
11973 /* For unknown compilers expect their behavior is DWARF version
11976 GCC started to support .debug_types sections by -gdwarf-4 since
11977 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
11978 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
11979 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
11980 interpreted incorrectly by GDB now - GCC PR debug/48229. */
11982 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
11984 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
11986 cs = &cu->producer[strlen ("GNU ")];
11987 while (*cs && !isdigit (*cs))
11989 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
11991 /* Not recognized as GCC. */
11995 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
11996 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
11999 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
12000 cu->producer_is_icc = 1;
12003 /* For other non-GCC compilers, expect their behavior is DWARF version
12007 cu->checked_producer = 1;
12010 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12011 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12012 during 4.6.0 experimental. */
12015 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12017 if (!cu->checked_producer)
12018 check_producer (cu);
12020 return cu->producer_is_gxx_lt_4_6;
12023 /* Return the default accessibility type if it is not overriden by
12024 DW_AT_accessibility. */
12026 static enum dwarf_access_attribute
12027 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12029 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12031 /* The default DWARF 2 accessibility for members is public, the default
12032 accessibility for inheritance is private. */
12034 if (die->tag != DW_TAG_inheritance)
12035 return DW_ACCESS_public;
12037 return DW_ACCESS_private;
12041 /* DWARF 3+ defines the default accessibility a different way. The same
12042 rules apply now for DW_TAG_inheritance as for the members and it only
12043 depends on the container kind. */
12045 if (die->parent->tag == DW_TAG_class_type)
12046 return DW_ACCESS_private;
12048 return DW_ACCESS_public;
12052 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12053 offset. If the attribute was not found return 0, otherwise return
12054 1. If it was found but could not properly be handled, set *OFFSET
12058 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12061 struct attribute *attr;
12063 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12068 /* Note that we do not check for a section offset first here.
12069 This is because DW_AT_data_member_location is new in DWARF 4,
12070 so if we see it, we can assume that a constant form is really
12071 a constant and not a section offset. */
12072 if (attr_form_is_constant (attr))
12073 *offset = dwarf2_get_attr_constant_value (attr, 0);
12074 else if (attr_form_is_section_offset (attr))
12075 dwarf2_complex_location_expr_complaint ();
12076 else if (attr_form_is_block (attr))
12077 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12079 dwarf2_complex_location_expr_complaint ();
12087 /* Add an aggregate field to the field list. */
12090 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12091 struct dwarf2_cu *cu)
12093 struct objfile *objfile = cu->objfile;
12094 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12095 struct nextfield *new_field;
12096 struct attribute *attr;
12098 const char *fieldname = "";
12100 /* Allocate a new field list entry and link it in. */
12101 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
12102 make_cleanup (xfree, new_field);
12103 memset (new_field, 0, sizeof (struct nextfield));
12105 if (die->tag == DW_TAG_inheritance)
12107 new_field->next = fip->baseclasses;
12108 fip->baseclasses = new_field;
12112 new_field->next = fip->fields;
12113 fip->fields = new_field;
12117 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12119 new_field->accessibility = DW_UNSND (attr);
12121 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12122 if (new_field->accessibility != DW_ACCESS_public)
12123 fip->non_public_fields = 1;
12125 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12127 new_field->virtuality = DW_UNSND (attr);
12129 new_field->virtuality = DW_VIRTUALITY_none;
12131 fp = &new_field->field;
12133 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12137 /* Data member other than a C++ static data member. */
12139 /* Get type of field. */
12140 fp->type = die_type (die, cu);
12142 SET_FIELD_BITPOS (*fp, 0);
12144 /* Get bit size of field (zero if none). */
12145 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12148 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12152 FIELD_BITSIZE (*fp) = 0;
12155 /* Get bit offset of field. */
12156 if (handle_data_member_location (die, cu, &offset))
12157 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12158 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
12161 if (gdbarch_bits_big_endian (gdbarch))
12163 /* For big endian bits, the DW_AT_bit_offset gives the
12164 additional bit offset from the MSB of the containing
12165 anonymous object to the MSB of the field. We don't
12166 have to do anything special since we don't need to
12167 know the size of the anonymous object. */
12168 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
12172 /* For little endian bits, compute the bit offset to the
12173 MSB of the anonymous object, subtract off the number of
12174 bits from the MSB of the field to the MSB of the
12175 object, and then subtract off the number of bits of
12176 the field itself. The result is the bit offset of
12177 the LSB of the field. */
12178 int anonymous_size;
12179 int bit_offset = DW_UNSND (attr);
12181 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12184 /* The size of the anonymous object containing
12185 the bit field is explicit, so use the
12186 indicated size (in bytes). */
12187 anonymous_size = DW_UNSND (attr);
12191 /* The size of the anonymous object containing
12192 the bit field must be inferred from the type
12193 attribute of the data member containing the
12195 anonymous_size = TYPE_LENGTH (fp->type);
12197 SET_FIELD_BITPOS (*fp,
12198 (FIELD_BITPOS (*fp)
12199 + anonymous_size * bits_per_byte
12200 - bit_offset - FIELD_BITSIZE (*fp)));
12204 /* Get name of field. */
12205 fieldname = dwarf2_name (die, cu);
12206 if (fieldname == NULL)
12209 /* The name is already allocated along with this objfile, so we don't
12210 need to duplicate it for the type. */
12211 fp->name = fieldname;
12213 /* Change accessibility for artificial fields (e.g. virtual table
12214 pointer or virtual base class pointer) to private. */
12215 if (dwarf2_attr (die, DW_AT_artificial, cu))
12217 FIELD_ARTIFICIAL (*fp) = 1;
12218 new_field->accessibility = DW_ACCESS_private;
12219 fip->non_public_fields = 1;
12222 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
12224 /* C++ static member. */
12226 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
12227 is a declaration, but all versions of G++ as of this writing
12228 (so through at least 3.2.1) incorrectly generate
12229 DW_TAG_variable tags. */
12231 const char *physname;
12233 /* Get name of field. */
12234 fieldname = dwarf2_name (die, cu);
12235 if (fieldname == NULL)
12238 attr = dwarf2_attr (die, DW_AT_const_value, cu);
12240 /* Only create a symbol if this is an external value.
12241 new_symbol checks this and puts the value in the global symbol
12242 table, which we want. If it is not external, new_symbol
12243 will try to put the value in cu->list_in_scope which is wrong. */
12244 && dwarf2_flag_true_p (die, DW_AT_external, cu))
12246 /* A static const member, not much different than an enum as far as
12247 we're concerned, except that we can support more types. */
12248 new_symbol (die, NULL, cu);
12251 /* Get physical name. */
12252 physname = dwarf2_physname (fieldname, die, cu);
12254 /* The name is already allocated along with this objfile, so we don't
12255 need to duplicate it for the type. */
12256 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
12257 FIELD_TYPE (*fp) = die_type (die, cu);
12258 FIELD_NAME (*fp) = fieldname;
12260 else if (die->tag == DW_TAG_inheritance)
12264 /* C++ base class field. */
12265 if (handle_data_member_location (die, cu, &offset))
12266 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12267 FIELD_BITSIZE (*fp) = 0;
12268 FIELD_TYPE (*fp) = die_type (die, cu);
12269 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
12270 fip->nbaseclasses++;
12274 /* Add a typedef defined in the scope of the FIP's class. */
12277 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
12278 struct dwarf2_cu *cu)
12280 struct objfile *objfile = cu->objfile;
12281 struct typedef_field_list *new_field;
12282 struct attribute *attr;
12283 struct typedef_field *fp;
12284 char *fieldname = "";
12286 /* Allocate a new field list entry and link it in. */
12287 new_field = xzalloc (sizeof (*new_field));
12288 make_cleanup (xfree, new_field);
12290 gdb_assert (die->tag == DW_TAG_typedef);
12292 fp = &new_field->field;
12294 /* Get name of field. */
12295 fp->name = dwarf2_name (die, cu);
12296 if (fp->name == NULL)
12299 fp->type = read_type_die (die, cu);
12301 new_field->next = fip->typedef_field_list;
12302 fip->typedef_field_list = new_field;
12303 fip->typedef_field_list_count++;
12306 /* Create the vector of fields, and attach it to the type. */
12309 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
12310 struct dwarf2_cu *cu)
12312 int nfields = fip->nfields;
12314 /* Record the field count, allocate space for the array of fields,
12315 and create blank accessibility bitfields if necessary. */
12316 TYPE_NFIELDS (type) = nfields;
12317 TYPE_FIELDS (type) = (struct field *)
12318 TYPE_ALLOC (type, sizeof (struct field) * nfields);
12319 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
12321 if (fip->non_public_fields && cu->language != language_ada)
12323 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12325 TYPE_FIELD_PRIVATE_BITS (type) =
12326 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12327 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
12329 TYPE_FIELD_PROTECTED_BITS (type) =
12330 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12331 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
12333 TYPE_FIELD_IGNORE_BITS (type) =
12334 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12335 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
12338 /* If the type has baseclasses, allocate and clear a bit vector for
12339 TYPE_FIELD_VIRTUAL_BITS. */
12340 if (fip->nbaseclasses && cu->language != language_ada)
12342 int num_bytes = B_BYTES (fip->nbaseclasses);
12343 unsigned char *pointer;
12345 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12346 pointer = TYPE_ALLOC (type, num_bytes);
12347 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
12348 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
12349 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
12352 /* Copy the saved-up fields into the field vector. Start from the head of
12353 the list, adding to the tail of the field array, so that they end up in
12354 the same order in the array in which they were added to the list. */
12355 while (nfields-- > 0)
12357 struct nextfield *fieldp;
12361 fieldp = fip->fields;
12362 fip->fields = fieldp->next;
12366 fieldp = fip->baseclasses;
12367 fip->baseclasses = fieldp->next;
12370 TYPE_FIELD (type, nfields) = fieldp->field;
12371 switch (fieldp->accessibility)
12373 case DW_ACCESS_private:
12374 if (cu->language != language_ada)
12375 SET_TYPE_FIELD_PRIVATE (type, nfields);
12378 case DW_ACCESS_protected:
12379 if (cu->language != language_ada)
12380 SET_TYPE_FIELD_PROTECTED (type, nfields);
12383 case DW_ACCESS_public:
12387 /* Unknown accessibility. Complain and treat it as public. */
12389 complaint (&symfile_complaints, _("unsupported accessibility %d"),
12390 fieldp->accessibility);
12394 if (nfields < fip->nbaseclasses)
12396 switch (fieldp->virtuality)
12398 case DW_VIRTUALITY_virtual:
12399 case DW_VIRTUALITY_pure_virtual:
12400 if (cu->language == language_ada)
12401 error (_("unexpected virtuality in component of Ada type"));
12402 SET_TYPE_FIELD_VIRTUAL (type, nfields);
12409 /* Return true if this member function is a constructor, false
12413 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
12415 const char *fieldname;
12416 const char *typename;
12419 if (die->parent == NULL)
12422 if (die->parent->tag != DW_TAG_structure_type
12423 && die->parent->tag != DW_TAG_union_type
12424 && die->parent->tag != DW_TAG_class_type)
12427 fieldname = dwarf2_name (die, cu);
12428 typename = dwarf2_name (die->parent, cu);
12429 if (fieldname == NULL || typename == NULL)
12432 len = strlen (fieldname);
12433 return (strncmp (fieldname, typename, len) == 0
12434 && (typename[len] == '\0' || typename[len] == '<'));
12437 /* Add a member function to the proper fieldlist. */
12440 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
12441 struct type *type, struct dwarf2_cu *cu)
12443 struct objfile *objfile = cu->objfile;
12444 struct attribute *attr;
12445 struct fnfieldlist *flp;
12447 struct fn_field *fnp;
12448 const char *fieldname;
12449 struct nextfnfield *new_fnfield;
12450 struct type *this_type;
12451 enum dwarf_access_attribute accessibility;
12453 if (cu->language == language_ada)
12454 error (_("unexpected member function in Ada type"));
12456 /* Get name of member function. */
12457 fieldname = dwarf2_name (die, cu);
12458 if (fieldname == NULL)
12461 /* Look up member function name in fieldlist. */
12462 for (i = 0; i < fip->nfnfields; i++)
12464 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
12468 /* Create new list element if necessary. */
12469 if (i < fip->nfnfields)
12470 flp = &fip->fnfieldlists[i];
12473 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
12475 fip->fnfieldlists = (struct fnfieldlist *)
12476 xrealloc (fip->fnfieldlists,
12477 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
12478 * sizeof (struct fnfieldlist));
12479 if (fip->nfnfields == 0)
12480 make_cleanup (free_current_contents, &fip->fnfieldlists);
12482 flp = &fip->fnfieldlists[fip->nfnfields];
12483 flp->name = fieldname;
12486 i = fip->nfnfields++;
12489 /* Create a new member function field and chain it to the field list
12491 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
12492 make_cleanup (xfree, new_fnfield);
12493 memset (new_fnfield, 0, sizeof (struct nextfnfield));
12494 new_fnfield->next = flp->head;
12495 flp->head = new_fnfield;
12498 /* Fill in the member function field info. */
12499 fnp = &new_fnfield->fnfield;
12501 /* Delay processing of the physname until later. */
12502 if (cu->language == language_cplus || cu->language == language_java)
12504 add_to_method_list (type, i, flp->length - 1, fieldname,
12509 const char *physname = dwarf2_physname (fieldname, die, cu);
12510 fnp->physname = physname ? physname : "";
12513 fnp->type = alloc_type (objfile);
12514 this_type = read_type_die (die, cu);
12515 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
12517 int nparams = TYPE_NFIELDS (this_type);
12519 /* TYPE is the domain of this method, and THIS_TYPE is the type
12520 of the method itself (TYPE_CODE_METHOD). */
12521 smash_to_method_type (fnp->type, type,
12522 TYPE_TARGET_TYPE (this_type),
12523 TYPE_FIELDS (this_type),
12524 TYPE_NFIELDS (this_type),
12525 TYPE_VARARGS (this_type));
12527 /* Handle static member functions.
12528 Dwarf2 has no clean way to discern C++ static and non-static
12529 member functions. G++ helps GDB by marking the first
12530 parameter for non-static member functions (which is the this
12531 pointer) as artificial. We obtain this information from
12532 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
12533 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
12534 fnp->voffset = VOFFSET_STATIC;
12537 complaint (&symfile_complaints, _("member function type missing for '%s'"),
12538 dwarf2_full_name (fieldname, die, cu));
12540 /* Get fcontext from DW_AT_containing_type if present. */
12541 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12542 fnp->fcontext = die_containing_type (die, cu);
12544 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
12545 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
12547 /* Get accessibility. */
12548 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12550 accessibility = DW_UNSND (attr);
12552 accessibility = dwarf2_default_access_attribute (die, cu);
12553 switch (accessibility)
12555 case DW_ACCESS_private:
12556 fnp->is_private = 1;
12558 case DW_ACCESS_protected:
12559 fnp->is_protected = 1;
12563 /* Check for artificial methods. */
12564 attr = dwarf2_attr (die, DW_AT_artificial, cu);
12565 if (attr && DW_UNSND (attr) != 0)
12566 fnp->is_artificial = 1;
12568 fnp->is_constructor = dwarf2_is_constructor (die, cu);
12570 /* Get index in virtual function table if it is a virtual member
12571 function. For older versions of GCC, this is an offset in the
12572 appropriate virtual table, as specified by DW_AT_containing_type.
12573 For everyone else, it is an expression to be evaluated relative
12574 to the object address. */
12576 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
12579 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
12581 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
12583 /* Old-style GCC. */
12584 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
12586 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
12587 || (DW_BLOCK (attr)->size > 1
12588 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
12589 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
12591 struct dwarf_block blk;
12594 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
12596 blk.size = DW_BLOCK (attr)->size - offset;
12597 blk.data = DW_BLOCK (attr)->data + offset;
12598 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
12599 if ((fnp->voffset % cu->header.addr_size) != 0)
12600 dwarf2_complex_location_expr_complaint ();
12602 fnp->voffset /= cu->header.addr_size;
12606 dwarf2_complex_location_expr_complaint ();
12608 if (!fnp->fcontext)
12609 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
12611 else if (attr_form_is_section_offset (attr))
12613 dwarf2_complex_location_expr_complaint ();
12617 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
12623 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12624 if (attr && DW_UNSND (attr))
12626 /* GCC does this, as of 2008-08-25; PR debug/37237. */
12627 complaint (&symfile_complaints,
12628 _("Member function \"%s\" (offset %d) is virtual "
12629 "but the vtable offset is not specified"),
12630 fieldname, die->offset.sect_off);
12631 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12632 TYPE_CPLUS_DYNAMIC (type) = 1;
12637 /* Create the vector of member function fields, and attach it to the type. */
12640 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
12641 struct dwarf2_cu *cu)
12643 struct fnfieldlist *flp;
12646 if (cu->language == language_ada)
12647 error (_("unexpected member functions in Ada type"));
12649 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12650 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
12651 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
12653 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
12655 struct nextfnfield *nfp = flp->head;
12656 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
12659 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
12660 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
12661 fn_flp->fn_fields = (struct fn_field *)
12662 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
12663 for (k = flp->length; (k--, nfp); nfp = nfp->next)
12664 fn_flp->fn_fields[k] = nfp->fnfield;
12667 TYPE_NFN_FIELDS (type) = fip->nfnfields;
12670 /* Returns non-zero if NAME is the name of a vtable member in CU's
12671 language, zero otherwise. */
12673 is_vtable_name (const char *name, struct dwarf2_cu *cu)
12675 static const char vptr[] = "_vptr";
12676 static const char vtable[] = "vtable";
12678 /* Look for the C++ and Java forms of the vtable. */
12679 if ((cu->language == language_java
12680 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
12681 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
12682 && is_cplus_marker (name[sizeof (vptr) - 1])))
12688 /* GCC outputs unnamed structures that are really pointers to member
12689 functions, with the ABI-specified layout. If TYPE describes
12690 such a structure, smash it into a member function type.
12692 GCC shouldn't do this; it should just output pointer to member DIEs.
12693 This is GCC PR debug/28767. */
12696 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
12698 struct type *pfn_type, *domain_type, *new_type;
12700 /* Check for a structure with no name and two children. */
12701 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
12704 /* Check for __pfn and __delta members. */
12705 if (TYPE_FIELD_NAME (type, 0) == NULL
12706 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
12707 || TYPE_FIELD_NAME (type, 1) == NULL
12708 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
12711 /* Find the type of the method. */
12712 pfn_type = TYPE_FIELD_TYPE (type, 0);
12713 if (pfn_type == NULL
12714 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
12715 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
12718 /* Look for the "this" argument. */
12719 pfn_type = TYPE_TARGET_TYPE (pfn_type);
12720 if (TYPE_NFIELDS (pfn_type) == 0
12721 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
12722 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
12725 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
12726 new_type = alloc_type (objfile);
12727 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
12728 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
12729 TYPE_VARARGS (pfn_type));
12730 smash_to_methodptr_type (type, new_type);
12733 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
12737 producer_is_icc (struct dwarf2_cu *cu)
12739 if (!cu->checked_producer)
12740 check_producer (cu);
12742 return cu->producer_is_icc;
12745 /* Called when we find the DIE that starts a structure or union scope
12746 (definition) to create a type for the structure or union. Fill in
12747 the type's name and general properties; the members will not be
12748 processed until process_structure_scope. A symbol table entry for
12749 the type will also not be done until process_structure_scope (assuming
12750 the type has a name).
12752 NOTE: we need to call these functions regardless of whether or not the
12753 DIE has a DW_AT_name attribute, since it might be an anonymous
12754 structure or union. This gets the type entered into our set of
12755 user defined types. */
12757 static struct type *
12758 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
12760 struct objfile *objfile = cu->objfile;
12762 struct attribute *attr;
12765 /* If the definition of this type lives in .debug_types, read that type.
12766 Don't follow DW_AT_specification though, that will take us back up
12767 the chain and we want to go down. */
12768 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12771 type = get_DW_AT_signature_type (die, attr, cu);
12773 /* The type's CU may not be the same as CU.
12774 Ensure TYPE is recorded with CU in die_type_hash. */
12775 return set_die_type (die, type, cu);
12778 type = alloc_type (objfile);
12779 INIT_CPLUS_SPECIFIC (type);
12781 name = dwarf2_name (die, cu);
12784 if (cu->language == language_cplus
12785 || cu->language == language_java)
12787 const char *full_name = dwarf2_full_name (name, die, cu);
12789 /* dwarf2_full_name might have already finished building the DIE's
12790 type. If so, there is no need to continue. */
12791 if (get_die_type (die, cu) != NULL)
12792 return get_die_type (die, cu);
12794 TYPE_TAG_NAME (type) = full_name;
12795 if (die->tag == DW_TAG_structure_type
12796 || die->tag == DW_TAG_class_type)
12797 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12801 /* The name is already allocated along with this objfile, so
12802 we don't need to duplicate it for the type. */
12803 TYPE_TAG_NAME (type) = name;
12804 if (die->tag == DW_TAG_class_type)
12805 TYPE_NAME (type) = TYPE_TAG_NAME (type);
12809 if (die->tag == DW_TAG_structure_type)
12811 TYPE_CODE (type) = TYPE_CODE_STRUCT;
12813 else if (die->tag == DW_TAG_union_type)
12815 TYPE_CODE (type) = TYPE_CODE_UNION;
12819 TYPE_CODE (type) = TYPE_CODE_CLASS;
12822 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
12823 TYPE_DECLARED_CLASS (type) = 1;
12825 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12828 TYPE_LENGTH (type) = DW_UNSND (attr);
12832 TYPE_LENGTH (type) = 0;
12835 if (producer_is_icc (cu))
12837 /* ICC does not output the required DW_AT_declaration
12838 on incomplete types, but gives them a size of zero. */
12841 TYPE_STUB_SUPPORTED (type) = 1;
12843 if (die_is_declaration (die, cu))
12844 TYPE_STUB (type) = 1;
12845 else if (attr == NULL && die->child == NULL
12846 && producer_is_realview (cu->producer))
12847 /* RealView does not output the required DW_AT_declaration
12848 on incomplete types. */
12849 TYPE_STUB (type) = 1;
12851 /* We need to add the type field to the die immediately so we don't
12852 infinitely recurse when dealing with pointers to the structure
12853 type within the structure itself. */
12854 set_die_type (die, type, cu);
12856 /* set_die_type should be already done. */
12857 set_descriptive_type (type, die, cu);
12862 /* Finish creating a structure or union type, including filling in
12863 its members and creating a symbol for it. */
12866 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
12868 struct objfile *objfile = cu->objfile;
12869 struct die_info *child_die = die->child;
12872 type = get_die_type (die, cu);
12874 type = read_structure_type (die, cu);
12876 if (die->child != NULL && ! die_is_declaration (die, cu))
12878 struct field_info fi;
12879 struct die_info *child_die;
12880 VEC (symbolp) *template_args = NULL;
12881 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
12883 memset (&fi, 0, sizeof (struct field_info));
12885 child_die = die->child;
12887 while (child_die && child_die->tag)
12889 if (child_die->tag == DW_TAG_member
12890 || child_die->tag == DW_TAG_variable)
12892 /* NOTE: carlton/2002-11-05: A C++ static data member
12893 should be a DW_TAG_member that is a declaration, but
12894 all versions of G++ as of this writing (so through at
12895 least 3.2.1) incorrectly generate DW_TAG_variable
12896 tags for them instead. */
12897 dwarf2_add_field (&fi, child_die, cu);
12899 else if (child_die->tag == DW_TAG_subprogram)
12901 /* C++ member function. */
12902 dwarf2_add_member_fn (&fi, child_die, type, cu);
12904 else if (child_die->tag == DW_TAG_inheritance)
12906 /* C++ base class field. */
12907 dwarf2_add_field (&fi, child_die, cu);
12909 else if (child_die->tag == DW_TAG_typedef)
12910 dwarf2_add_typedef (&fi, child_die, cu);
12911 else if (child_die->tag == DW_TAG_template_type_param
12912 || child_die->tag == DW_TAG_template_value_param)
12914 struct symbol *arg = new_symbol (child_die, NULL, cu);
12917 VEC_safe_push (symbolp, template_args, arg);
12920 child_die = sibling_die (child_die);
12923 /* Attach template arguments to type. */
12924 if (! VEC_empty (symbolp, template_args))
12926 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12927 TYPE_N_TEMPLATE_ARGUMENTS (type)
12928 = VEC_length (symbolp, template_args);
12929 TYPE_TEMPLATE_ARGUMENTS (type)
12930 = obstack_alloc (&objfile->objfile_obstack,
12931 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12932 * sizeof (struct symbol *)));
12933 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
12934 VEC_address (symbolp, template_args),
12935 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12936 * sizeof (struct symbol *)));
12937 VEC_free (symbolp, template_args);
12940 /* Attach fields and member functions to the type. */
12942 dwarf2_attach_fields_to_type (&fi, type, cu);
12945 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
12947 /* Get the type which refers to the base class (possibly this
12948 class itself) which contains the vtable pointer for the current
12949 class from the DW_AT_containing_type attribute. This use of
12950 DW_AT_containing_type is a GNU extension. */
12952 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12954 struct type *t = die_containing_type (die, cu);
12956 TYPE_VPTR_BASETYPE (type) = t;
12961 /* Our own class provides vtbl ptr. */
12962 for (i = TYPE_NFIELDS (t) - 1;
12963 i >= TYPE_N_BASECLASSES (t);
12966 const char *fieldname = TYPE_FIELD_NAME (t, i);
12968 if (is_vtable_name (fieldname, cu))
12970 TYPE_VPTR_FIELDNO (type) = i;
12975 /* Complain if virtual function table field not found. */
12976 if (i < TYPE_N_BASECLASSES (t))
12977 complaint (&symfile_complaints,
12978 _("virtual function table pointer "
12979 "not found when defining class '%s'"),
12980 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
12985 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
12988 else if (cu->producer
12989 && strncmp (cu->producer,
12990 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
12992 /* The IBM XLC compiler does not provide direct indication
12993 of the containing type, but the vtable pointer is
12994 always named __vfp. */
12998 for (i = TYPE_NFIELDS (type) - 1;
12999 i >= TYPE_N_BASECLASSES (type);
13002 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13004 TYPE_VPTR_FIELDNO (type) = i;
13005 TYPE_VPTR_BASETYPE (type) = type;
13012 /* Copy fi.typedef_field_list linked list elements content into the
13013 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13014 if (fi.typedef_field_list)
13016 int i = fi.typedef_field_list_count;
13018 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13019 TYPE_TYPEDEF_FIELD_ARRAY (type)
13020 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
13021 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13023 /* Reverse the list order to keep the debug info elements order. */
13026 struct typedef_field *dest, *src;
13028 dest = &TYPE_TYPEDEF_FIELD (type, i);
13029 src = &fi.typedef_field_list->field;
13030 fi.typedef_field_list = fi.typedef_field_list->next;
13035 do_cleanups (back_to);
13037 if (HAVE_CPLUS_STRUCT (type))
13038 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
13041 quirk_gcc_member_function_pointer (type, objfile);
13043 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13044 snapshots) has been known to create a die giving a declaration
13045 for a class that has, as a child, a die giving a definition for a
13046 nested class. So we have to process our children even if the
13047 current die is a declaration. Normally, of course, a declaration
13048 won't have any children at all. */
13050 while (child_die != NULL && child_die->tag)
13052 if (child_die->tag == DW_TAG_member
13053 || child_die->tag == DW_TAG_variable
13054 || child_die->tag == DW_TAG_inheritance
13055 || child_die->tag == DW_TAG_template_value_param
13056 || child_die->tag == DW_TAG_template_type_param)
13061 process_die (child_die, cu);
13063 child_die = sibling_die (child_die);
13066 /* Do not consider external references. According to the DWARF standard,
13067 these DIEs are identified by the fact that they have no byte_size
13068 attribute, and a declaration attribute. */
13069 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13070 || !die_is_declaration (die, cu))
13071 new_symbol (die, type, cu);
13074 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13075 update TYPE using some information only available in DIE's children. */
13078 update_enumeration_type_from_children (struct die_info *die,
13080 struct dwarf2_cu *cu)
13082 struct obstack obstack;
13083 struct die_info *child_die = die->child;
13084 int unsigned_enum = 1;
13087 struct cleanup *old_chain;
13089 obstack_init (&obstack);
13090 old_chain = make_cleanup_obstack_free (&obstack);
13092 while (child_die != NULL && child_die->tag)
13094 struct attribute *attr;
13096 const gdb_byte *bytes;
13097 struct dwarf2_locexpr_baton *baton;
13099 if (child_die->tag != DW_TAG_enumerator)
13102 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13106 name = dwarf2_name (child_die, cu);
13108 name = "<anonymous enumerator>";
13110 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13111 &value, &bytes, &baton);
13117 else if ((mask & value) != 0)
13122 /* If we already know that the enum type is neither unsigned, nor
13123 a flag type, no need to look at the rest of the enumerates. */
13124 if (!unsigned_enum && !flag_enum)
13126 child_die = sibling_die (child_die);
13130 TYPE_UNSIGNED (type) = 1;
13132 TYPE_FLAG_ENUM (type) = 1;
13134 do_cleanups (old_chain);
13137 /* Given a DW_AT_enumeration_type die, set its type. We do not
13138 complete the type's fields yet, or create any symbols. */
13140 static struct type *
13141 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13143 struct objfile *objfile = cu->objfile;
13145 struct attribute *attr;
13148 /* If the definition of this type lives in .debug_types, read that type.
13149 Don't follow DW_AT_specification though, that will take us back up
13150 the chain and we want to go down. */
13151 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13154 type = get_DW_AT_signature_type (die, attr, cu);
13156 /* The type's CU may not be the same as CU.
13157 Ensure TYPE is recorded with CU in die_type_hash. */
13158 return set_die_type (die, type, cu);
13161 type = alloc_type (objfile);
13163 TYPE_CODE (type) = TYPE_CODE_ENUM;
13164 name = dwarf2_full_name (NULL, die, cu);
13166 TYPE_TAG_NAME (type) = name;
13168 attr = dwarf2_attr (die, DW_AT_type, cu);
13171 struct type *underlying_type = die_type (die, cu);
13173 TYPE_TARGET_TYPE (type) = underlying_type;
13176 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13179 TYPE_LENGTH (type) = DW_UNSND (attr);
13183 TYPE_LENGTH (type) = 0;
13186 /* The enumeration DIE can be incomplete. In Ada, any type can be
13187 declared as private in the package spec, and then defined only
13188 inside the package body. Such types are known as Taft Amendment
13189 Types. When another package uses such a type, an incomplete DIE
13190 may be generated by the compiler. */
13191 if (die_is_declaration (die, cu))
13192 TYPE_STUB (type) = 1;
13194 /* Finish the creation of this type by using the enum's children.
13195 We must call this even when the underlying type has been provided
13196 so that we can determine if we're looking at a "flag" enum. */
13197 update_enumeration_type_from_children (die, type, cu);
13199 /* If this type has an underlying type that is not a stub, then we
13200 may use its attributes. We always use the "unsigned" attribute
13201 in this situation, because ordinarily we guess whether the type
13202 is unsigned -- but the guess can be wrong and the underlying type
13203 can tell us the reality. However, we defer to a local size
13204 attribute if one exists, because this lets the compiler override
13205 the underlying type if needed. */
13206 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13208 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13209 if (TYPE_LENGTH (type) == 0)
13210 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13213 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
13215 return set_die_type (die, type, cu);
13218 /* Given a pointer to a die which begins an enumeration, process all
13219 the dies that define the members of the enumeration, and create the
13220 symbol for the enumeration type.
13222 NOTE: We reverse the order of the element list. */
13225 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
13227 struct type *this_type;
13229 this_type = get_die_type (die, cu);
13230 if (this_type == NULL)
13231 this_type = read_enumeration_type (die, cu);
13233 if (die->child != NULL)
13235 struct die_info *child_die;
13236 struct symbol *sym;
13237 struct field *fields = NULL;
13238 int num_fields = 0;
13241 child_die = die->child;
13242 while (child_die && child_die->tag)
13244 if (child_die->tag != DW_TAG_enumerator)
13246 process_die (child_die, cu);
13250 name = dwarf2_name (child_die, cu);
13253 sym = new_symbol (child_die, this_type, cu);
13255 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
13257 fields = (struct field *)
13259 (num_fields + DW_FIELD_ALLOC_CHUNK)
13260 * sizeof (struct field));
13263 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
13264 FIELD_TYPE (fields[num_fields]) = NULL;
13265 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
13266 FIELD_BITSIZE (fields[num_fields]) = 0;
13272 child_die = sibling_die (child_die);
13277 TYPE_NFIELDS (this_type) = num_fields;
13278 TYPE_FIELDS (this_type) = (struct field *)
13279 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
13280 memcpy (TYPE_FIELDS (this_type), fields,
13281 sizeof (struct field) * num_fields);
13286 /* If we are reading an enum from a .debug_types unit, and the enum
13287 is a declaration, and the enum is not the signatured type in the
13288 unit, then we do not want to add a symbol for it. Adding a
13289 symbol would in some cases obscure the true definition of the
13290 enum, giving users an incomplete type when the definition is
13291 actually available. Note that we do not want to do this for all
13292 enums which are just declarations, because C++0x allows forward
13293 enum declarations. */
13294 if (cu->per_cu->is_debug_types
13295 && die_is_declaration (die, cu))
13297 struct signatured_type *sig_type;
13299 sig_type = (struct signatured_type *) cu->per_cu;
13300 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
13301 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
13305 new_symbol (die, this_type, cu);
13308 /* Extract all information from a DW_TAG_array_type DIE and put it in
13309 the DIE's type field. For now, this only handles one dimensional
13312 static struct type *
13313 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
13315 struct objfile *objfile = cu->objfile;
13316 struct die_info *child_die;
13318 struct type *element_type, *range_type, *index_type;
13319 struct type **range_types = NULL;
13320 struct attribute *attr;
13322 struct cleanup *back_to;
13324 unsigned int bit_stride = 0;
13326 element_type = die_type (die, cu);
13328 /* The die_type call above may have already set the type for this DIE. */
13329 type = get_die_type (die, cu);
13333 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
13335 bit_stride = DW_UNSND (attr) * 8;
13337 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
13339 bit_stride = DW_UNSND (attr);
13341 /* Irix 6.2 native cc creates array types without children for
13342 arrays with unspecified length. */
13343 if (die->child == NULL)
13345 index_type = objfile_type (objfile)->builtin_int;
13346 range_type = create_static_range_type (NULL, index_type, 0, -1);
13347 type = create_array_type_with_stride (NULL, element_type, range_type,
13349 return set_die_type (die, type, cu);
13352 back_to = make_cleanup (null_cleanup, NULL);
13353 child_die = die->child;
13354 while (child_die && child_die->tag)
13356 if (child_die->tag == DW_TAG_subrange_type)
13358 struct type *child_type = read_type_die (child_die, cu);
13360 if (child_type != NULL)
13362 /* The range type was succesfully read. Save it for the
13363 array type creation. */
13364 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
13366 range_types = (struct type **)
13367 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
13368 * sizeof (struct type *));
13370 make_cleanup (free_current_contents, &range_types);
13372 range_types[ndim++] = child_type;
13375 child_die = sibling_die (child_die);
13378 /* Dwarf2 dimensions are output from left to right, create the
13379 necessary array types in backwards order. */
13381 type = element_type;
13383 if (read_array_order (die, cu) == DW_ORD_col_major)
13388 type = create_array_type_with_stride (NULL, type, range_types[i++],
13394 type = create_array_type_with_stride (NULL, type, range_types[ndim],
13398 /* Understand Dwarf2 support for vector types (like they occur on
13399 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
13400 array type. This is not part of the Dwarf2/3 standard yet, but a
13401 custom vendor extension. The main difference between a regular
13402 array and the vector variant is that vectors are passed by value
13404 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
13406 make_vector_type (type);
13408 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
13409 implementation may choose to implement triple vectors using this
13411 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13414 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
13415 TYPE_LENGTH (type) = DW_UNSND (attr);
13417 complaint (&symfile_complaints,
13418 _("DW_AT_byte_size for array type smaller "
13419 "than the total size of elements"));
13422 name = dwarf2_name (die, cu);
13424 TYPE_NAME (type) = name;
13426 /* Install the type in the die. */
13427 set_die_type (die, type, cu);
13429 /* set_die_type should be already done. */
13430 set_descriptive_type (type, die, cu);
13432 do_cleanups (back_to);
13437 static enum dwarf_array_dim_ordering
13438 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
13440 struct attribute *attr;
13442 attr = dwarf2_attr (die, DW_AT_ordering, cu);
13444 if (attr) return DW_SND (attr);
13446 /* GNU F77 is a special case, as at 08/2004 array type info is the
13447 opposite order to the dwarf2 specification, but data is still
13448 laid out as per normal fortran.
13450 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
13451 version checking. */
13453 if (cu->language == language_fortran
13454 && cu->producer && strstr (cu->producer, "GNU F77"))
13456 return DW_ORD_row_major;
13459 switch (cu->language_defn->la_array_ordering)
13461 case array_column_major:
13462 return DW_ORD_col_major;
13463 case array_row_major:
13465 return DW_ORD_row_major;
13469 /* Extract all information from a DW_TAG_set_type DIE and put it in
13470 the DIE's type field. */
13472 static struct type *
13473 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
13475 struct type *domain_type, *set_type;
13476 struct attribute *attr;
13478 domain_type = die_type (die, cu);
13480 /* The die_type call above may have already set the type for this DIE. */
13481 set_type = get_die_type (die, cu);
13485 set_type = create_set_type (NULL, domain_type);
13487 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13489 TYPE_LENGTH (set_type) = DW_UNSND (attr);
13491 return set_die_type (die, set_type, cu);
13494 /* A helper for read_common_block that creates a locexpr baton.
13495 SYM is the symbol which we are marking as computed.
13496 COMMON_DIE is the DIE for the common block.
13497 COMMON_LOC is the location expression attribute for the common
13499 MEMBER_LOC is the location expression attribute for the particular
13500 member of the common block that we are processing.
13501 CU is the CU from which the above come. */
13504 mark_common_block_symbol_computed (struct symbol *sym,
13505 struct die_info *common_die,
13506 struct attribute *common_loc,
13507 struct attribute *member_loc,
13508 struct dwarf2_cu *cu)
13510 struct objfile *objfile = dwarf2_per_objfile->objfile;
13511 struct dwarf2_locexpr_baton *baton;
13513 unsigned int cu_off;
13514 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
13515 LONGEST offset = 0;
13517 gdb_assert (common_loc && member_loc);
13518 gdb_assert (attr_form_is_block (common_loc));
13519 gdb_assert (attr_form_is_block (member_loc)
13520 || attr_form_is_constant (member_loc));
13522 baton = obstack_alloc (&objfile->objfile_obstack,
13523 sizeof (struct dwarf2_locexpr_baton));
13524 baton->per_cu = cu->per_cu;
13525 gdb_assert (baton->per_cu);
13527 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
13529 if (attr_form_is_constant (member_loc))
13531 offset = dwarf2_get_attr_constant_value (member_loc, 0);
13532 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
13535 baton->size += DW_BLOCK (member_loc)->size;
13537 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
13540 *ptr++ = DW_OP_call4;
13541 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
13542 store_unsigned_integer (ptr, 4, byte_order, cu_off);
13545 if (attr_form_is_constant (member_loc))
13547 *ptr++ = DW_OP_addr;
13548 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
13549 ptr += cu->header.addr_size;
13553 /* We have to copy the data here, because DW_OP_call4 will only
13554 use a DW_AT_location attribute. */
13555 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
13556 ptr += DW_BLOCK (member_loc)->size;
13559 *ptr++ = DW_OP_plus;
13560 gdb_assert (ptr - baton->data == baton->size);
13562 SYMBOL_LOCATION_BATON (sym) = baton;
13563 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
13566 /* Create appropriate locally-scoped variables for all the
13567 DW_TAG_common_block entries. Also create a struct common_block
13568 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
13569 is used to sepate the common blocks name namespace from regular
13573 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
13575 struct attribute *attr;
13577 attr = dwarf2_attr (die, DW_AT_location, cu);
13580 /* Support the .debug_loc offsets. */
13581 if (attr_form_is_block (attr))
13585 else if (attr_form_is_section_offset (attr))
13587 dwarf2_complex_location_expr_complaint ();
13592 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13593 "common block member");
13598 if (die->child != NULL)
13600 struct objfile *objfile = cu->objfile;
13601 struct die_info *child_die;
13602 size_t n_entries = 0, size;
13603 struct common_block *common_block;
13604 struct symbol *sym;
13606 for (child_die = die->child;
13607 child_die && child_die->tag;
13608 child_die = sibling_die (child_die))
13611 size = (sizeof (struct common_block)
13612 + (n_entries - 1) * sizeof (struct symbol *));
13613 common_block = obstack_alloc (&objfile->objfile_obstack, size);
13614 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
13615 common_block->n_entries = 0;
13617 for (child_die = die->child;
13618 child_die && child_die->tag;
13619 child_die = sibling_die (child_die))
13621 /* Create the symbol in the DW_TAG_common_block block in the current
13623 sym = new_symbol (child_die, NULL, cu);
13626 struct attribute *member_loc;
13628 common_block->contents[common_block->n_entries++] = sym;
13630 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
13634 /* GDB has handled this for a long time, but it is
13635 not specified by DWARF. It seems to have been
13636 emitted by gfortran at least as recently as:
13637 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
13638 complaint (&symfile_complaints,
13639 _("Variable in common block has "
13640 "DW_AT_data_member_location "
13641 "- DIE at 0x%x [in module %s]"),
13642 child_die->offset.sect_off,
13643 objfile_name (cu->objfile));
13645 if (attr_form_is_section_offset (member_loc))
13646 dwarf2_complex_location_expr_complaint ();
13647 else if (attr_form_is_constant (member_loc)
13648 || attr_form_is_block (member_loc))
13651 mark_common_block_symbol_computed (sym, die, attr,
13655 dwarf2_complex_location_expr_complaint ();
13660 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
13661 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
13665 /* Create a type for a C++ namespace. */
13667 static struct type *
13668 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
13670 struct objfile *objfile = cu->objfile;
13671 const char *previous_prefix, *name;
13675 /* For extensions, reuse the type of the original namespace. */
13676 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
13678 struct die_info *ext_die;
13679 struct dwarf2_cu *ext_cu = cu;
13681 ext_die = dwarf2_extension (die, &ext_cu);
13682 type = read_type_die (ext_die, ext_cu);
13684 /* EXT_CU may not be the same as CU.
13685 Ensure TYPE is recorded with CU in die_type_hash. */
13686 return set_die_type (die, type, cu);
13689 name = namespace_name (die, &is_anonymous, cu);
13691 /* Now build the name of the current namespace. */
13693 previous_prefix = determine_prefix (die, cu);
13694 if (previous_prefix[0] != '\0')
13695 name = typename_concat (&objfile->objfile_obstack,
13696 previous_prefix, name, 0, cu);
13698 /* Create the type. */
13699 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
13701 TYPE_NAME (type) = name;
13702 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13704 return set_die_type (die, type, cu);
13707 /* Read a C++ namespace. */
13710 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
13712 struct objfile *objfile = cu->objfile;
13715 /* Add a symbol associated to this if we haven't seen the namespace
13716 before. Also, add a using directive if it's an anonymous
13719 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
13723 type = read_type_die (die, cu);
13724 new_symbol (die, type, cu);
13726 namespace_name (die, &is_anonymous, cu);
13729 const char *previous_prefix = determine_prefix (die, cu);
13731 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
13732 NULL, NULL, 0, &objfile->objfile_obstack);
13736 if (die->child != NULL)
13738 struct die_info *child_die = die->child;
13740 while (child_die && child_die->tag)
13742 process_die (child_die, cu);
13743 child_die = sibling_die (child_die);
13748 /* Read a Fortran module as type. This DIE can be only a declaration used for
13749 imported module. Still we need that type as local Fortran "use ... only"
13750 declaration imports depend on the created type in determine_prefix. */
13752 static struct type *
13753 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
13755 struct objfile *objfile = cu->objfile;
13756 const char *module_name;
13759 module_name = dwarf2_name (die, cu);
13761 complaint (&symfile_complaints,
13762 _("DW_TAG_module has no name, offset 0x%x"),
13763 die->offset.sect_off);
13764 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
13766 /* determine_prefix uses TYPE_TAG_NAME. */
13767 TYPE_TAG_NAME (type) = TYPE_NAME (type);
13769 return set_die_type (die, type, cu);
13772 /* Read a Fortran module. */
13775 read_module (struct die_info *die, struct dwarf2_cu *cu)
13777 struct die_info *child_die = die->child;
13780 type = read_type_die (die, cu);
13781 new_symbol (die, type, cu);
13783 while (child_die && child_die->tag)
13785 process_die (child_die, cu);
13786 child_die = sibling_die (child_die);
13790 /* Return the name of the namespace represented by DIE. Set
13791 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
13794 static const char *
13795 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
13797 struct die_info *current_die;
13798 const char *name = NULL;
13800 /* Loop through the extensions until we find a name. */
13802 for (current_die = die;
13803 current_die != NULL;
13804 current_die = dwarf2_extension (die, &cu))
13806 name = dwarf2_name (current_die, cu);
13811 /* Is it an anonymous namespace? */
13813 *is_anonymous = (name == NULL);
13815 name = CP_ANONYMOUS_NAMESPACE_STR;
13820 /* Extract all information from a DW_TAG_pointer_type DIE and add to
13821 the user defined type vector. */
13823 static struct type *
13824 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
13826 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
13827 struct comp_unit_head *cu_header = &cu->header;
13829 struct attribute *attr_byte_size;
13830 struct attribute *attr_address_class;
13831 int byte_size, addr_class;
13832 struct type *target_type;
13834 target_type = die_type (die, cu);
13836 /* The die_type call above may have already set the type for this DIE. */
13837 type = get_die_type (die, cu);
13841 type = lookup_pointer_type (target_type);
13843 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
13844 if (attr_byte_size)
13845 byte_size = DW_UNSND (attr_byte_size);
13847 byte_size = cu_header->addr_size;
13849 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
13850 if (attr_address_class)
13851 addr_class = DW_UNSND (attr_address_class);
13853 addr_class = DW_ADDR_none;
13855 /* If the pointer size or address class is different than the
13856 default, create a type variant marked as such and set the
13857 length accordingly. */
13858 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
13860 if (gdbarch_address_class_type_flags_p (gdbarch))
13864 type_flags = gdbarch_address_class_type_flags
13865 (gdbarch, byte_size, addr_class);
13866 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
13868 type = make_type_with_address_space (type, type_flags);
13870 else if (TYPE_LENGTH (type) != byte_size)
13872 complaint (&symfile_complaints,
13873 _("invalid pointer size %d"), byte_size);
13877 /* Should we also complain about unhandled address classes? */
13881 TYPE_LENGTH (type) = byte_size;
13882 return set_die_type (die, type, cu);
13885 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
13886 the user defined type vector. */
13888 static struct type *
13889 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
13892 struct type *to_type;
13893 struct type *domain;
13895 to_type = die_type (die, cu);
13896 domain = die_containing_type (die, cu);
13898 /* The calls above may have already set the type for this DIE. */
13899 type = get_die_type (die, cu);
13903 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
13904 type = lookup_methodptr_type (to_type);
13905 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
13907 struct type *new_type = alloc_type (cu->objfile);
13909 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
13910 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
13911 TYPE_VARARGS (to_type));
13912 type = lookup_methodptr_type (new_type);
13915 type = lookup_memberptr_type (to_type, domain);
13917 return set_die_type (die, type, cu);
13920 /* Extract all information from a DW_TAG_reference_type DIE and add to
13921 the user defined type vector. */
13923 static struct type *
13924 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
13926 struct comp_unit_head *cu_header = &cu->header;
13927 struct type *type, *target_type;
13928 struct attribute *attr;
13930 target_type = die_type (die, cu);
13932 /* The die_type call above may have already set the type for this DIE. */
13933 type = get_die_type (die, cu);
13937 type = lookup_reference_type (target_type);
13938 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13941 TYPE_LENGTH (type) = DW_UNSND (attr);
13945 TYPE_LENGTH (type) = cu_header->addr_size;
13947 return set_die_type (die, type, cu);
13950 static struct type *
13951 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
13953 struct type *base_type, *cv_type;
13955 base_type = die_type (die, cu);
13957 /* The die_type call above may have already set the type for this DIE. */
13958 cv_type = get_die_type (die, cu);
13962 /* In case the const qualifier is applied to an array type, the element type
13963 is so qualified, not the array type (section 6.7.3 of C99). */
13964 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
13966 struct type *el_type, *inner_array;
13968 base_type = copy_type (base_type);
13969 inner_array = base_type;
13971 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
13973 TYPE_TARGET_TYPE (inner_array) =
13974 copy_type (TYPE_TARGET_TYPE (inner_array));
13975 inner_array = TYPE_TARGET_TYPE (inner_array);
13978 el_type = TYPE_TARGET_TYPE (inner_array);
13979 TYPE_TARGET_TYPE (inner_array) =
13980 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
13982 return set_die_type (die, base_type, cu);
13985 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
13986 return set_die_type (die, cv_type, cu);
13989 static struct type *
13990 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
13992 struct type *base_type, *cv_type;
13994 base_type = die_type (die, cu);
13996 /* The die_type call above may have already set the type for this DIE. */
13997 cv_type = get_die_type (die, cu);
14001 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14002 return set_die_type (die, cv_type, cu);
14005 /* Handle DW_TAG_restrict_type. */
14007 static struct type *
14008 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14010 struct type *base_type, *cv_type;
14012 base_type = die_type (die, cu);
14014 /* The die_type call above may have already set the type for this DIE. */
14015 cv_type = get_die_type (die, cu);
14019 cv_type = make_restrict_type (base_type);
14020 return set_die_type (die, cv_type, cu);
14023 /* Extract all information from a DW_TAG_string_type DIE and add to
14024 the user defined type vector. It isn't really a user defined type,
14025 but it behaves like one, with other DIE's using an AT_user_def_type
14026 attribute to reference it. */
14028 static struct type *
14029 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14031 struct objfile *objfile = cu->objfile;
14032 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14033 struct type *type, *range_type, *index_type, *char_type;
14034 struct attribute *attr;
14035 unsigned int length;
14037 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14040 length = DW_UNSND (attr);
14044 /* Check for the DW_AT_byte_size attribute. */
14045 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14048 length = DW_UNSND (attr);
14056 index_type = objfile_type (objfile)->builtin_int;
14057 range_type = create_static_range_type (NULL, index_type, 1, length);
14058 char_type = language_string_char_type (cu->language_defn, gdbarch);
14059 type = create_string_type (NULL, char_type, range_type);
14061 return set_die_type (die, type, cu);
14064 /* Assuming that DIE corresponds to a function, returns nonzero
14065 if the function is prototyped. */
14068 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14070 struct attribute *attr;
14072 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14073 if (attr && (DW_UNSND (attr) != 0))
14076 /* The DWARF standard implies that the DW_AT_prototyped attribute
14077 is only meaninful for C, but the concept also extends to other
14078 languages that allow unprototyped functions (Eg: Objective C).
14079 For all other languages, assume that functions are always
14081 if (cu->language != language_c
14082 && cu->language != language_objc
14083 && cu->language != language_opencl)
14086 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14087 prototyped and unprototyped functions; default to prototyped,
14088 since that is more common in modern code (and RealView warns
14089 about unprototyped functions). */
14090 if (producer_is_realview (cu->producer))
14096 /* Handle DIES due to C code like:
14100 int (*funcp)(int a, long l);
14104 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14106 static struct type *
14107 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14109 struct objfile *objfile = cu->objfile;
14110 struct type *type; /* Type that this function returns. */
14111 struct type *ftype; /* Function that returns above type. */
14112 struct attribute *attr;
14114 type = die_type (die, cu);
14116 /* The die_type call above may have already set the type for this DIE. */
14117 ftype = get_die_type (die, cu);
14121 ftype = lookup_function_type (type);
14123 if (prototyped_function_p (die, cu))
14124 TYPE_PROTOTYPED (ftype) = 1;
14126 /* Store the calling convention in the type if it's available in
14127 the subroutine die. Otherwise set the calling convention to
14128 the default value DW_CC_normal. */
14129 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14131 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14132 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14133 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14135 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14137 /* We need to add the subroutine type to the die immediately so
14138 we don't infinitely recurse when dealing with parameters
14139 declared as the same subroutine type. */
14140 set_die_type (die, ftype, cu);
14142 if (die->child != NULL)
14144 struct type *void_type = objfile_type (objfile)->builtin_void;
14145 struct die_info *child_die;
14146 int nparams, iparams;
14148 /* Count the number of parameters.
14149 FIXME: GDB currently ignores vararg functions, but knows about
14150 vararg member functions. */
14152 child_die = die->child;
14153 while (child_die && child_die->tag)
14155 if (child_die->tag == DW_TAG_formal_parameter)
14157 else if (child_die->tag == DW_TAG_unspecified_parameters)
14158 TYPE_VARARGS (ftype) = 1;
14159 child_die = sibling_die (child_die);
14162 /* Allocate storage for parameters and fill them in. */
14163 TYPE_NFIELDS (ftype) = nparams;
14164 TYPE_FIELDS (ftype) = (struct field *)
14165 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
14167 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
14168 even if we error out during the parameters reading below. */
14169 for (iparams = 0; iparams < nparams; iparams++)
14170 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
14173 child_die = die->child;
14174 while (child_die && child_die->tag)
14176 if (child_die->tag == DW_TAG_formal_parameter)
14178 struct type *arg_type;
14180 /* DWARF version 2 has no clean way to discern C++
14181 static and non-static member functions. G++ helps
14182 GDB by marking the first parameter for non-static
14183 member functions (which is the this pointer) as
14184 artificial. We pass this information to
14185 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
14187 DWARF version 3 added DW_AT_object_pointer, which GCC
14188 4.5 does not yet generate. */
14189 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
14191 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
14194 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
14196 /* GCC/43521: In java, the formal parameter
14197 "this" is sometimes not marked with DW_AT_artificial. */
14198 if (cu->language == language_java)
14200 const char *name = dwarf2_name (child_die, cu);
14202 if (name && !strcmp (name, "this"))
14203 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
14206 arg_type = die_type (child_die, cu);
14208 /* RealView does not mark THIS as const, which the testsuite
14209 expects. GCC marks THIS as const in method definitions,
14210 but not in the class specifications (GCC PR 43053). */
14211 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
14212 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
14215 struct dwarf2_cu *arg_cu = cu;
14216 const char *name = dwarf2_name (child_die, cu);
14218 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
14221 /* If the compiler emits this, use it. */
14222 if (follow_die_ref (die, attr, &arg_cu) == child_die)
14225 else if (name && strcmp (name, "this") == 0)
14226 /* Function definitions will have the argument names. */
14228 else if (name == NULL && iparams == 0)
14229 /* Declarations may not have the names, so like
14230 elsewhere in GDB, assume an artificial first
14231 argument is "this". */
14235 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
14239 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
14242 child_die = sibling_die (child_die);
14249 static struct type *
14250 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
14252 struct objfile *objfile = cu->objfile;
14253 const char *name = NULL;
14254 struct type *this_type, *target_type;
14256 name = dwarf2_full_name (NULL, die, cu);
14257 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
14258 TYPE_FLAG_TARGET_STUB, NULL, objfile);
14259 TYPE_NAME (this_type) = name;
14260 set_die_type (die, this_type, cu);
14261 target_type = die_type (die, cu);
14262 if (target_type != this_type)
14263 TYPE_TARGET_TYPE (this_type) = target_type;
14266 /* Self-referential typedefs are, it seems, not allowed by the DWARF
14267 spec and cause infinite loops in GDB. */
14268 complaint (&symfile_complaints,
14269 _("Self-referential DW_TAG_typedef "
14270 "- DIE at 0x%x [in module %s]"),
14271 die->offset.sect_off, objfile_name (objfile));
14272 TYPE_TARGET_TYPE (this_type) = NULL;
14277 /* Find a representation of a given base type and install
14278 it in the TYPE field of the die. */
14280 static struct type *
14281 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
14283 struct objfile *objfile = cu->objfile;
14285 struct attribute *attr;
14286 int encoding = 0, size = 0;
14288 enum type_code code = TYPE_CODE_INT;
14289 int type_flags = 0;
14290 struct type *target_type = NULL;
14292 attr = dwarf2_attr (die, DW_AT_encoding, cu);
14295 encoding = DW_UNSND (attr);
14297 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14300 size = DW_UNSND (attr);
14302 name = dwarf2_name (die, cu);
14305 complaint (&symfile_complaints,
14306 _("DW_AT_name missing from DW_TAG_base_type"));
14311 case DW_ATE_address:
14312 /* Turn DW_ATE_address into a void * pointer. */
14313 code = TYPE_CODE_PTR;
14314 type_flags |= TYPE_FLAG_UNSIGNED;
14315 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
14317 case DW_ATE_boolean:
14318 code = TYPE_CODE_BOOL;
14319 type_flags |= TYPE_FLAG_UNSIGNED;
14321 case DW_ATE_complex_float:
14322 code = TYPE_CODE_COMPLEX;
14323 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
14325 case DW_ATE_decimal_float:
14326 code = TYPE_CODE_DECFLOAT;
14329 code = TYPE_CODE_FLT;
14331 case DW_ATE_signed:
14333 case DW_ATE_unsigned:
14334 type_flags |= TYPE_FLAG_UNSIGNED;
14335 if (cu->language == language_fortran
14337 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
14338 code = TYPE_CODE_CHAR;
14340 case DW_ATE_signed_char:
14341 if (cu->language == language_ada || cu->language == language_m2
14342 || cu->language == language_pascal
14343 || cu->language == language_fortran)
14344 code = TYPE_CODE_CHAR;
14346 case DW_ATE_unsigned_char:
14347 if (cu->language == language_ada || cu->language == language_m2
14348 || cu->language == language_pascal
14349 || cu->language == language_fortran)
14350 code = TYPE_CODE_CHAR;
14351 type_flags |= TYPE_FLAG_UNSIGNED;
14354 /* We just treat this as an integer and then recognize the
14355 type by name elsewhere. */
14359 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
14360 dwarf_type_encoding_name (encoding));
14364 type = init_type (code, size, type_flags, NULL, objfile);
14365 TYPE_NAME (type) = name;
14366 TYPE_TARGET_TYPE (type) = target_type;
14368 if (name && strcmp (name, "char") == 0)
14369 TYPE_NOSIGN (type) = 1;
14371 return set_die_type (die, type, cu);
14374 /* Parse dwarf attribute if it's a block, reference or constant and put the
14375 resulting value of the attribute into struct bound_prop.
14376 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
14379 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
14380 struct dwarf2_cu *cu, struct dynamic_prop *prop)
14382 struct dwarf2_property_baton *baton;
14383 struct obstack *obstack = &cu->objfile->objfile_obstack;
14385 if (attr == NULL || prop == NULL)
14388 if (attr_form_is_block (attr))
14390 baton = obstack_alloc (obstack, sizeof (*baton));
14391 baton->referenced_type = NULL;
14392 baton->locexpr.per_cu = cu->per_cu;
14393 baton->locexpr.size = DW_BLOCK (attr)->size;
14394 baton->locexpr.data = DW_BLOCK (attr)->data;
14395 prop->data.baton = baton;
14396 prop->kind = PROP_LOCEXPR;
14397 gdb_assert (prop->data.baton != NULL);
14399 else if (attr_form_is_ref (attr))
14401 struct dwarf2_cu *target_cu = cu;
14402 struct die_info *target_die;
14403 struct attribute *target_attr;
14405 target_die = follow_die_ref (die, attr, &target_cu);
14406 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
14407 if (target_attr == NULL)
14410 if (attr_form_is_section_offset (target_attr))
14412 baton = obstack_alloc (obstack, sizeof (*baton));
14413 baton->referenced_type = die_type (target_die, target_cu);
14414 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
14415 prop->data.baton = baton;
14416 prop->kind = PROP_LOCLIST;
14417 gdb_assert (prop->data.baton != NULL);
14419 else if (attr_form_is_block (target_attr))
14421 baton = obstack_alloc (obstack, sizeof (*baton));
14422 baton->referenced_type = die_type (target_die, target_cu);
14423 baton->locexpr.per_cu = cu->per_cu;
14424 baton->locexpr.size = DW_BLOCK (target_attr)->size;
14425 baton->locexpr.data = DW_BLOCK (target_attr)->data;
14426 prop->data.baton = baton;
14427 prop->kind = PROP_LOCEXPR;
14428 gdb_assert (prop->data.baton != NULL);
14432 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14433 "dynamic property");
14437 else if (attr_form_is_constant (attr))
14439 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
14440 prop->kind = PROP_CONST;
14444 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
14445 dwarf2_name (die, cu));
14452 /* Read the given DW_AT_subrange DIE. */
14454 static struct type *
14455 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
14457 struct type *base_type, *orig_base_type;
14458 struct type *range_type;
14459 struct attribute *attr;
14460 struct dynamic_prop low, high;
14461 int low_default_is_valid;
14462 int high_bound_is_count = 0;
14464 LONGEST negative_mask;
14466 orig_base_type = die_type (die, cu);
14467 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
14468 whereas the real type might be. So, we use ORIG_BASE_TYPE when
14469 creating the range type, but we use the result of check_typedef
14470 when examining properties of the type. */
14471 base_type = check_typedef (orig_base_type);
14473 /* The die_type call above may have already set the type for this DIE. */
14474 range_type = get_die_type (die, cu);
14478 low.kind = PROP_CONST;
14479 high.kind = PROP_CONST;
14480 high.data.const_val = 0;
14482 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
14483 omitting DW_AT_lower_bound. */
14484 switch (cu->language)
14487 case language_cplus:
14488 low.data.const_val = 0;
14489 low_default_is_valid = 1;
14491 case language_fortran:
14492 low.data.const_val = 1;
14493 low_default_is_valid = 1;
14496 case language_java:
14497 case language_objc:
14498 low.data.const_val = 0;
14499 low_default_is_valid = (cu->header.version >= 4);
14503 case language_pascal:
14504 low.data.const_val = 1;
14505 low_default_is_valid = (cu->header.version >= 4);
14508 low.data.const_val = 0;
14509 low_default_is_valid = 0;
14513 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
14515 attr_to_dynamic_prop (attr, die, cu, &low);
14516 else if (!low_default_is_valid)
14517 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
14518 "- DIE at 0x%x [in module %s]"),
14519 die->offset.sect_off, objfile_name (cu->objfile));
14521 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
14522 if (!attr_to_dynamic_prop (attr, die, cu, &high))
14524 attr = dwarf2_attr (die, DW_AT_count, cu);
14525 if (attr_to_dynamic_prop (attr, die, cu, &high))
14527 /* If bounds are constant do the final calculation here. */
14528 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
14529 high.data.const_val = low.data.const_val + high.data.const_val - 1;
14531 high_bound_is_count = 1;
14535 /* Dwarf-2 specifications explicitly allows to create subrange types
14536 without specifying a base type.
14537 In that case, the base type must be set to the type of
14538 the lower bound, upper bound or count, in that order, if any of these
14539 three attributes references an object that has a type.
14540 If no base type is found, the Dwarf-2 specifications say that
14541 a signed integer type of size equal to the size of an address should
14543 For the following C code: `extern char gdb_int [];'
14544 GCC produces an empty range DIE.
14545 FIXME: muller/2010-05-28: Possible references to object for low bound,
14546 high bound or count are not yet handled by this code. */
14547 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
14549 struct objfile *objfile = cu->objfile;
14550 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14551 int addr_size = gdbarch_addr_bit (gdbarch) /8;
14552 struct type *int_type = objfile_type (objfile)->builtin_int;
14554 /* Test "int", "long int", and "long long int" objfile types,
14555 and select the first one having a size above or equal to the
14556 architecture address size. */
14557 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14558 base_type = int_type;
14561 int_type = objfile_type (objfile)->builtin_long;
14562 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14563 base_type = int_type;
14566 int_type = objfile_type (objfile)->builtin_long_long;
14567 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
14568 base_type = int_type;
14573 /* Normally, the DWARF producers are expected to use a signed
14574 constant form (Eg. DW_FORM_sdata) to express negative bounds.
14575 But this is unfortunately not always the case, as witnessed
14576 with GCC, for instance, where the ambiguous DW_FORM_dataN form
14577 is used instead. To work around that ambiguity, we treat
14578 the bounds as signed, and thus sign-extend their values, when
14579 the base type is signed. */
14581 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
14582 if (low.kind == PROP_CONST
14583 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
14584 low.data.const_val |= negative_mask;
14585 if (high.kind == PROP_CONST
14586 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
14587 high.data.const_val |= negative_mask;
14589 range_type = create_range_type (NULL, orig_base_type, &low, &high);
14591 if (high_bound_is_count)
14592 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
14594 /* Ada expects an empty array on no boundary attributes. */
14595 if (attr == NULL && cu->language != language_ada)
14596 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
14598 name = dwarf2_name (die, cu);
14600 TYPE_NAME (range_type) = name;
14602 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14604 TYPE_LENGTH (range_type) = DW_UNSND (attr);
14606 set_die_type (die, range_type, cu);
14608 /* set_die_type should be already done. */
14609 set_descriptive_type (range_type, die, cu);
14614 static struct type *
14615 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
14619 /* For now, we only support the C meaning of an unspecified type: void. */
14621 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
14622 TYPE_NAME (type) = dwarf2_name (die, cu);
14624 return set_die_type (die, type, cu);
14627 /* Read a single die and all its descendents. Set the die's sibling
14628 field to NULL; set other fields in the die correctly, and set all
14629 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
14630 location of the info_ptr after reading all of those dies. PARENT
14631 is the parent of the die in question. */
14633 static struct die_info *
14634 read_die_and_children (const struct die_reader_specs *reader,
14635 const gdb_byte *info_ptr,
14636 const gdb_byte **new_info_ptr,
14637 struct die_info *parent)
14639 struct die_info *die;
14640 const gdb_byte *cur_ptr;
14643 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
14646 *new_info_ptr = cur_ptr;
14649 store_in_ref_table (die, reader->cu);
14652 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
14656 *new_info_ptr = cur_ptr;
14659 die->sibling = NULL;
14660 die->parent = parent;
14664 /* Read a die, all of its descendents, and all of its siblings; set
14665 all of the fields of all of the dies correctly. Arguments are as
14666 in read_die_and_children. */
14668 static struct die_info *
14669 read_die_and_siblings_1 (const struct die_reader_specs *reader,
14670 const gdb_byte *info_ptr,
14671 const gdb_byte **new_info_ptr,
14672 struct die_info *parent)
14674 struct die_info *first_die, *last_sibling;
14675 const gdb_byte *cur_ptr;
14677 cur_ptr = info_ptr;
14678 first_die = last_sibling = NULL;
14682 struct die_info *die
14683 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
14687 *new_info_ptr = cur_ptr;
14694 last_sibling->sibling = die;
14696 last_sibling = die;
14700 /* Read a die, all of its descendents, and all of its siblings; set
14701 all of the fields of all of the dies correctly. Arguments are as
14702 in read_die_and_children.
14703 This the main entry point for reading a DIE and all its children. */
14705 static struct die_info *
14706 read_die_and_siblings (const struct die_reader_specs *reader,
14707 const gdb_byte *info_ptr,
14708 const gdb_byte **new_info_ptr,
14709 struct die_info *parent)
14711 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
14712 new_info_ptr, parent);
14714 if (dwarf2_die_debug)
14716 fprintf_unfiltered (gdb_stdlog,
14717 "Read die from %s@0x%x of %s:\n",
14718 get_section_name (reader->die_section),
14719 (unsigned) (info_ptr - reader->die_section->buffer),
14720 bfd_get_filename (reader->abfd));
14721 dump_die (die, dwarf2_die_debug);
14727 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
14729 The caller is responsible for filling in the extra attributes
14730 and updating (*DIEP)->num_attrs.
14731 Set DIEP to point to a newly allocated die with its information,
14732 except for its child, sibling, and parent fields.
14733 Set HAS_CHILDREN to tell whether the die has children or not. */
14735 static const gdb_byte *
14736 read_full_die_1 (const struct die_reader_specs *reader,
14737 struct die_info **diep, const gdb_byte *info_ptr,
14738 int *has_children, int num_extra_attrs)
14740 unsigned int abbrev_number, bytes_read, i;
14741 sect_offset offset;
14742 struct abbrev_info *abbrev;
14743 struct die_info *die;
14744 struct dwarf2_cu *cu = reader->cu;
14745 bfd *abfd = reader->abfd;
14747 offset.sect_off = info_ptr - reader->buffer;
14748 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14749 info_ptr += bytes_read;
14750 if (!abbrev_number)
14757 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
14759 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
14761 bfd_get_filename (abfd));
14763 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
14764 die->offset = offset;
14765 die->tag = abbrev->tag;
14766 die->abbrev = abbrev_number;
14768 /* Make the result usable.
14769 The caller needs to update num_attrs after adding the extra
14771 die->num_attrs = abbrev->num_attrs;
14773 for (i = 0; i < abbrev->num_attrs; ++i)
14774 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
14778 *has_children = abbrev->has_children;
14782 /* Read a die and all its attributes.
14783 Set DIEP to point to a newly allocated die with its information,
14784 except for its child, sibling, and parent fields.
14785 Set HAS_CHILDREN to tell whether the die has children or not. */
14787 static const gdb_byte *
14788 read_full_die (const struct die_reader_specs *reader,
14789 struct die_info **diep, const gdb_byte *info_ptr,
14792 const gdb_byte *result;
14794 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
14796 if (dwarf2_die_debug)
14798 fprintf_unfiltered (gdb_stdlog,
14799 "Read die from %s@0x%x of %s:\n",
14800 get_section_name (reader->die_section),
14801 (unsigned) (info_ptr - reader->die_section->buffer),
14802 bfd_get_filename (reader->abfd));
14803 dump_die (*diep, dwarf2_die_debug);
14809 /* Abbreviation tables.
14811 In DWARF version 2, the description of the debugging information is
14812 stored in a separate .debug_abbrev section. Before we read any
14813 dies from a section we read in all abbreviations and install them
14814 in a hash table. */
14816 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
14818 static struct abbrev_info *
14819 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
14821 struct abbrev_info *abbrev;
14823 abbrev = (struct abbrev_info *)
14824 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
14825 memset (abbrev, 0, sizeof (struct abbrev_info));
14829 /* Add an abbreviation to the table. */
14832 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
14833 unsigned int abbrev_number,
14834 struct abbrev_info *abbrev)
14836 unsigned int hash_number;
14838 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14839 abbrev->next = abbrev_table->abbrevs[hash_number];
14840 abbrev_table->abbrevs[hash_number] = abbrev;
14843 /* Look up an abbrev in the table.
14844 Returns NULL if the abbrev is not found. */
14846 static struct abbrev_info *
14847 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
14848 unsigned int abbrev_number)
14850 unsigned int hash_number;
14851 struct abbrev_info *abbrev;
14853 hash_number = abbrev_number % ABBREV_HASH_SIZE;
14854 abbrev = abbrev_table->abbrevs[hash_number];
14858 if (abbrev->number == abbrev_number)
14860 abbrev = abbrev->next;
14865 /* Read in an abbrev table. */
14867 static struct abbrev_table *
14868 abbrev_table_read_table (struct dwarf2_section_info *section,
14869 sect_offset offset)
14871 struct objfile *objfile = dwarf2_per_objfile->objfile;
14872 bfd *abfd = get_section_bfd_owner (section);
14873 struct abbrev_table *abbrev_table;
14874 const gdb_byte *abbrev_ptr;
14875 struct abbrev_info *cur_abbrev;
14876 unsigned int abbrev_number, bytes_read, abbrev_name;
14877 unsigned int abbrev_form;
14878 struct attr_abbrev *cur_attrs;
14879 unsigned int allocated_attrs;
14881 abbrev_table = XNEW (struct abbrev_table);
14882 abbrev_table->offset = offset;
14883 obstack_init (&abbrev_table->abbrev_obstack);
14884 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
14886 * sizeof (struct abbrev_info *)));
14887 memset (abbrev_table->abbrevs, 0,
14888 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
14890 dwarf2_read_section (objfile, section);
14891 abbrev_ptr = section->buffer + offset.sect_off;
14892 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14893 abbrev_ptr += bytes_read;
14895 allocated_attrs = ATTR_ALLOC_CHUNK;
14896 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
14898 /* Loop until we reach an abbrev number of 0. */
14899 while (abbrev_number)
14901 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
14903 /* read in abbrev header */
14904 cur_abbrev->number = abbrev_number;
14905 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14906 abbrev_ptr += bytes_read;
14907 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
14910 /* now read in declarations */
14911 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14912 abbrev_ptr += bytes_read;
14913 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14914 abbrev_ptr += bytes_read;
14915 while (abbrev_name)
14917 if (cur_abbrev->num_attrs == allocated_attrs)
14919 allocated_attrs += ATTR_ALLOC_CHUNK;
14921 = xrealloc (cur_attrs, (allocated_attrs
14922 * sizeof (struct attr_abbrev)));
14925 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
14926 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
14927 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14928 abbrev_ptr += bytes_read;
14929 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14930 abbrev_ptr += bytes_read;
14933 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
14934 (cur_abbrev->num_attrs
14935 * sizeof (struct attr_abbrev)));
14936 memcpy (cur_abbrev->attrs, cur_attrs,
14937 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
14939 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
14941 /* Get next abbreviation.
14942 Under Irix6 the abbreviations for a compilation unit are not
14943 always properly terminated with an abbrev number of 0.
14944 Exit loop if we encounter an abbreviation which we have
14945 already read (which means we are about to read the abbreviations
14946 for the next compile unit) or if the end of the abbreviation
14947 table is reached. */
14948 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
14950 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
14951 abbrev_ptr += bytes_read;
14952 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
14957 return abbrev_table;
14960 /* Free the resources held by ABBREV_TABLE. */
14963 abbrev_table_free (struct abbrev_table *abbrev_table)
14965 obstack_free (&abbrev_table->abbrev_obstack, NULL);
14966 xfree (abbrev_table);
14969 /* Same as abbrev_table_free but as a cleanup.
14970 We pass in a pointer to the pointer to the table so that we can
14971 set the pointer to NULL when we're done. It also simplifies
14972 build_type_unit_groups. */
14975 abbrev_table_free_cleanup (void *table_ptr)
14977 struct abbrev_table **abbrev_table_ptr = table_ptr;
14979 if (*abbrev_table_ptr != NULL)
14980 abbrev_table_free (*abbrev_table_ptr);
14981 *abbrev_table_ptr = NULL;
14984 /* Read the abbrev table for CU from ABBREV_SECTION. */
14987 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
14988 struct dwarf2_section_info *abbrev_section)
14991 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
14994 /* Release the memory used by the abbrev table for a compilation unit. */
14997 dwarf2_free_abbrev_table (void *ptr_to_cu)
14999 struct dwarf2_cu *cu = ptr_to_cu;
15001 if (cu->abbrev_table != NULL)
15002 abbrev_table_free (cu->abbrev_table);
15003 /* Set this to NULL so that we SEGV if we try to read it later,
15004 and also because free_comp_unit verifies this is NULL. */
15005 cu->abbrev_table = NULL;
15008 /* Returns nonzero if TAG represents a type that we might generate a partial
15012 is_type_tag_for_partial (int tag)
15017 /* Some types that would be reasonable to generate partial symbols for,
15018 that we don't at present. */
15019 case DW_TAG_array_type:
15020 case DW_TAG_file_type:
15021 case DW_TAG_ptr_to_member_type:
15022 case DW_TAG_set_type:
15023 case DW_TAG_string_type:
15024 case DW_TAG_subroutine_type:
15026 case DW_TAG_base_type:
15027 case DW_TAG_class_type:
15028 case DW_TAG_interface_type:
15029 case DW_TAG_enumeration_type:
15030 case DW_TAG_structure_type:
15031 case DW_TAG_subrange_type:
15032 case DW_TAG_typedef:
15033 case DW_TAG_union_type:
15040 /* Load all DIEs that are interesting for partial symbols into memory. */
15042 static struct partial_die_info *
15043 load_partial_dies (const struct die_reader_specs *reader,
15044 const gdb_byte *info_ptr, int building_psymtab)
15046 struct dwarf2_cu *cu = reader->cu;
15047 struct objfile *objfile = cu->objfile;
15048 struct partial_die_info *part_die;
15049 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15050 struct abbrev_info *abbrev;
15051 unsigned int bytes_read;
15052 unsigned int load_all = 0;
15053 int nesting_level = 1;
15058 gdb_assert (cu->per_cu != NULL);
15059 if (cu->per_cu->load_all_dies)
15063 = htab_create_alloc_ex (cu->header.length / 12,
15067 &cu->comp_unit_obstack,
15068 hashtab_obstack_allocate,
15069 dummy_obstack_deallocate);
15071 part_die = obstack_alloc (&cu->comp_unit_obstack,
15072 sizeof (struct partial_die_info));
15076 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15078 /* A NULL abbrev means the end of a series of children. */
15079 if (abbrev == NULL)
15081 if (--nesting_level == 0)
15083 /* PART_DIE was probably the last thing allocated on the
15084 comp_unit_obstack, so we could call obstack_free
15085 here. We don't do that because the waste is small,
15086 and will be cleaned up when we're done with this
15087 compilation unit. This way, we're also more robust
15088 against other users of the comp_unit_obstack. */
15091 info_ptr += bytes_read;
15092 last_die = parent_die;
15093 parent_die = parent_die->die_parent;
15097 /* Check for template arguments. We never save these; if
15098 they're seen, we just mark the parent, and go on our way. */
15099 if (parent_die != NULL
15100 && cu->language == language_cplus
15101 && (abbrev->tag == DW_TAG_template_type_param
15102 || abbrev->tag == DW_TAG_template_value_param))
15104 parent_die->has_template_arguments = 1;
15108 /* We don't need a partial DIE for the template argument. */
15109 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15114 /* We only recurse into c++ subprograms looking for template arguments.
15115 Skip their other children. */
15117 && cu->language == language_cplus
15118 && parent_die != NULL
15119 && parent_die->tag == DW_TAG_subprogram)
15121 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15125 /* Check whether this DIE is interesting enough to save. Normally
15126 we would not be interested in members here, but there may be
15127 later variables referencing them via DW_AT_specification (for
15128 static members). */
15130 && !is_type_tag_for_partial (abbrev->tag)
15131 && abbrev->tag != DW_TAG_constant
15132 && abbrev->tag != DW_TAG_enumerator
15133 && abbrev->tag != DW_TAG_subprogram
15134 && abbrev->tag != DW_TAG_lexical_block
15135 && abbrev->tag != DW_TAG_variable
15136 && abbrev->tag != DW_TAG_namespace
15137 && abbrev->tag != DW_TAG_module
15138 && abbrev->tag != DW_TAG_member
15139 && abbrev->tag != DW_TAG_imported_unit
15140 && abbrev->tag != DW_TAG_imported_declaration)
15142 /* Otherwise we skip to the next sibling, if any. */
15143 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15147 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
15150 /* This two-pass algorithm for processing partial symbols has a
15151 high cost in cache pressure. Thus, handle some simple cases
15152 here which cover the majority of C partial symbols. DIEs
15153 which neither have specification tags in them, nor could have
15154 specification tags elsewhere pointing at them, can simply be
15155 processed and discarded.
15157 This segment is also optional; scan_partial_symbols and
15158 add_partial_symbol will handle these DIEs if we chain
15159 them in normally. When compilers which do not emit large
15160 quantities of duplicate debug information are more common,
15161 this code can probably be removed. */
15163 /* Any complete simple types at the top level (pretty much all
15164 of them, for a language without namespaces), can be processed
15166 if (parent_die == NULL
15167 && part_die->has_specification == 0
15168 && part_die->is_declaration == 0
15169 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
15170 || part_die->tag == DW_TAG_base_type
15171 || part_die->tag == DW_TAG_subrange_type))
15173 if (building_psymtab && part_die->name != NULL)
15174 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15175 VAR_DOMAIN, LOC_TYPEDEF,
15176 &objfile->static_psymbols,
15177 0, (CORE_ADDR) 0, cu->language, objfile);
15178 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15182 /* The exception for DW_TAG_typedef with has_children above is
15183 a workaround of GCC PR debug/47510. In the case of this complaint
15184 type_name_no_tag_or_error will error on such types later.
15186 GDB skipped children of DW_TAG_typedef by the shortcut above and then
15187 it could not find the child DIEs referenced later, this is checked
15188 above. In correct DWARF DW_TAG_typedef should have no children. */
15190 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
15191 complaint (&symfile_complaints,
15192 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
15193 "- DIE at 0x%x [in module %s]"),
15194 part_die->offset.sect_off, objfile_name (objfile));
15196 /* If we're at the second level, and we're an enumerator, and
15197 our parent has no specification (meaning possibly lives in a
15198 namespace elsewhere), then we can add the partial symbol now
15199 instead of queueing it. */
15200 if (part_die->tag == DW_TAG_enumerator
15201 && parent_die != NULL
15202 && parent_die->die_parent == NULL
15203 && parent_die->tag == DW_TAG_enumeration_type
15204 && parent_die->has_specification == 0)
15206 if (part_die->name == NULL)
15207 complaint (&symfile_complaints,
15208 _("malformed enumerator DIE ignored"));
15209 else if (building_psymtab)
15210 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15211 VAR_DOMAIN, LOC_CONST,
15212 (cu->language == language_cplus
15213 || cu->language == language_java)
15214 ? &objfile->global_psymbols
15215 : &objfile->static_psymbols,
15216 0, (CORE_ADDR) 0, cu->language, objfile);
15218 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15222 /* We'll save this DIE so link it in. */
15223 part_die->die_parent = parent_die;
15224 part_die->die_sibling = NULL;
15225 part_die->die_child = NULL;
15227 if (last_die && last_die == parent_die)
15228 last_die->die_child = part_die;
15230 last_die->die_sibling = part_die;
15232 last_die = part_die;
15234 if (first_die == NULL)
15235 first_die = part_die;
15237 /* Maybe add the DIE to the hash table. Not all DIEs that we
15238 find interesting need to be in the hash table, because we
15239 also have the parent/sibling/child chains; only those that we
15240 might refer to by offset later during partial symbol reading.
15242 For now this means things that might have be the target of a
15243 DW_AT_specification, DW_AT_abstract_origin, or
15244 DW_AT_extension. DW_AT_extension will refer only to
15245 namespaces; DW_AT_abstract_origin refers to functions (and
15246 many things under the function DIE, but we do not recurse
15247 into function DIEs during partial symbol reading) and
15248 possibly variables as well; DW_AT_specification refers to
15249 declarations. Declarations ought to have the DW_AT_declaration
15250 flag. It happens that GCC forgets to put it in sometimes, but
15251 only for functions, not for types.
15253 Adding more things than necessary to the hash table is harmless
15254 except for the performance cost. Adding too few will result in
15255 wasted time in find_partial_die, when we reread the compilation
15256 unit with load_all_dies set. */
15259 || abbrev->tag == DW_TAG_constant
15260 || abbrev->tag == DW_TAG_subprogram
15261 || abbrev->tag == DW_TAG_variable
15262 || abbrev->tag == DW_TAG_namespace
15263 || part_die->is_declaration)
15267 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
15268 part_die->offset.sect_off, INSERT);
15272 part_die = obstack_alloc (&cu->comp_unit_obstack,
15273 sizeof (struct partial_die_info));
15275 /* For some DIEs we want to follow their children (if any). For C
15276 we have no reason to follow the children of structures; for other
15277 languages we have to, so that we can get at method physnames
15278 to infer fully qualified class names, for DW_AT_specification,
15279 and for C++ template arguments. For C++, we also look one level
15280 inside functions to find template arguments (if the name of the
15281 function does not already contain the template arguments).
15283 For Ada, we need to scan the children of subprograms and lexical
15284 blocks as well because Ada allows the definition of nested
15285 entities that could be interesting for the debugger, such as
15286 nested subprograms for instance. */
15287 if (last_die->has_children
15289 || last_die->tag == DW_TAG_namespace
15290 || last_die->tag == DW_TAG_module
15291 || last_die->tag == DW_TAG_enumeration_type
15292 || (cu->language == language_cplus
15293 && last_die->tag == DW_TAG_subprogram
15294 && (last_die->name == NULL
15295 || strchr (last_die->name, '<') == NULL))
15296 || (cu->language != language_c
15297 && (last_die->tag == DW_TAG_class_type
15298 || last_die->tag == DW_TAG_interface_type
15299 || last_die->tag == DW_TAG_structure_type
15300 || last_die->tag == DW_TAG_union_type))
15301 || (cu->language == language_ada
15302 && (last_die->tag == DW_TAG_subprogram
15303 || last_die->tag == DW_TAG_lexical_block))))
15306 parent_die = last_die;
15310 /* Otherwise we skip to the next sibling, if any. */
15311 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
15313 /* Back to the top, do it again. */
15317 /* Read a minimal amount of information into the minimal die structure. */
15319 static const gdb_byte *
15320 read_partial_die (const struct die_reader_specs *reader,
15321 struct partial_die_info *part_die,
15322 struct abbrev_info *abbrev, unsigned int abbrev_len,
15323 const gdb_byte *info_ptr)
15325 struct dwarf2_cu *cu = reader->cu;
15326 struct objfile *objfile = cu->objfile;
15327 const gdb_byte *buffer = reader->buffer;
15329 struct attribute attr;
15330 int has_low_pc_attr = 0;
15331 int has_high_pc_attr = 0;
15332 int high_pc_relative = 0;
15334 memset (part_die, 0, sizeof (struct partial_die_info));
15336 part_die->offset.sect_off = info_ptr - buffer;
15338 info_ptr += abbrev_len;
15340 if (abbrev == NULL)
15343 part_die->tag = abbrev->tag;
15344 part_die->has_children = abbrev->has_children;
15346 for (i = 0; i < abbrev->num_attrs; ++i)
15348 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
15350 /* Store the data if it is of an attribute we want to keep in a
15351 partial symbol table. */
15355 switch (part_die->tag)
15357 case DW_TAG_compile_unit:
15358 case DW_TAG_partial_unit:
15359 case DW_TAG_type_unit:
15360 /* Compilation units have a DW_AT_name that is a filename, not
15361 a source language identifier. */
15362 case DW_TAG_enumeration_type:
15363 case DW_TAG_enumerator:
15364 /* These tags always have simple identifiers already; no need
15365 to canonicalize them. */
15366 part_die->name = DW_STRING (&attr);
15370 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
15371 &objfile->objfile_obstack);
15375 case DW_AT_linkage_name:
15376 case DW_AT_MIPS_linkage_name:
15377 /* Note that both forms of linkage name might appear. We
15378 assume they will be the same, and we only store the last
15380 if (cu->language == language_ada)
15381 part_die->name = DW_STRING (&attr);
15382 part_die->linkage_name = DW_STRING (&attr);
15385 has_low_pc_attr = 1;
15386 part_die->lowpc = attr_value_as_address (&attr);
15388 case DW_AT_high_pc:
15389 has_high_pc_attr = 1;
15390 part_die->highpc = attr_value_as_address (&attr);
15391 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
15392 high_pc_relative = 1;
15394 case DW_AT_location:
15395 /* Support the .debug_loc offsets. */
15396 if (attr_form_is_block (&attr))
15398 part_die->d.locdesc = DW_BLOCK (&attr);
15400 else if (attr_form_is_section_offset (&attr))
15402 dwarf2_complex_location_expr_complaint ();
15406 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15407 "partial symbol information");
15410 case DW_AT_external:
15411 part_die->is_external = DW_UNSND (&attr);
15413 case DW_AT_declaration:
15414 part_die->is_declaration = DW_UNSND (&attr);
15417 part_die->has_type = 1;
15419 case DW_AT_abstract_origin:
15420 case DW_AT_specification:
15421 case DW_AT_extension:
15422 part_die->has_specification = 1;
15423 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
15424 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15425 || cu->per_cu->is_dwz);
15427 case DW_AT_sibling:
15428 /* Ignore absolute siblings, they might point outside of
15429 the current compile unit. */
15430 if (attr.form == DW_FORM_ref_addr)
15431 complaint (&symfile_complaints,
15432 _("ignoring absolute DW_AT_sibling"));
15435 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
15436 const gdb_byte *sibling_ptr = buffer + off;
15438 if (sibling_ptr < info_ptr)
15439 complaint (&symfile_complaints,
15440 _("DW_AT_sibling points backwards"));
15441 else if (sibling_ptr > reader->buffer_end)
15442 dwarf2_section_buffer_overflow_complaint (reader->die_section);
15444 part_die->sibling = sibling_ptr;
15447 case DW_AT_byte_size:
15448 part_die->has_byte_size = 1;
15450 case DW_AT_calling_convention:
15451 /* DWARF doesn't provide a way to identify a program's source-level
15452 entry point. DW_AT_calling_convention attributes are only meant
15453 to describe functions' calling conventions.
15455 However, because it's a necessary piece of information in
15456 Fortran, and because DW_CC_program is the only piece of debugging
15457 information whose definition refers to a 'main program' at all,
15458 several compilers have begun marking Fortran main programs with
15459 DW_CC_program --- even when those functions use the standard
15460 calling conventions.
15462 So until DWARF specifies a way to provide this information and
15463 compilers pick up the new representation, we'll support this
15465 if (DW_UNSND (&attr) == DW_CC_program
15466 && cu->language == language_fortran)
15467 set_objfile_main_name (objfile, part_die->name, language_fortran);
15470 if (DW_UNSND (&attr) == DW_INL_inlined
15471 || DW_UNSND (&attr) == DW_INL_declared_inlined)
15472 part_die->may_be_inlined = 1;
15476 if (part_die->tag == DW_TAG_imported_unit)
15478 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
15479 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15480 || cu->per_cu->is_dwz);
15489 if (high_pc_relative)
15490 part_die->highpc += part_die->lowpc;
15492 if (has_low_pc_attr && has_high_pc_attr)
15494 /* When using the GNU linker, .gnu.linkonce. sections are used to
15495 eliminate duplicate copies of functions and vtables and such.
15496 The linker will arbitrarily choose one and discard the others.
15497 The AT_*_pc values for such functions refer to local labels in
15498 these sections. If the section from that file was discarded, the
15499 labels are not in the output, so the relocs get a value of 0.
15500 If this is a discarded function, mark the pc bounds as invalid,
15501 so that GDB will ignore it. */
15502 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
15504 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15506 complaint (&symfile_complaints,
15507 _("DW_AT_low_pc %s is zero "
15508 "for DIE at 0x%x [in module %s]"),
15509 paddress (gdbarch, part_die->lowpc),
15510 part_die->offset.sect_off, objfile_name (objfile));
15512 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
15513 else if (part_die->lowpc >= part_die->highpc)
15515 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15517 complaint (&symfile_complaints,
15518 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
15519 "for DIE at 0x%x [in module %s]"),
15520 paddress (gdbarch, part_die->lowpc),
15521 paddress (gdbarch, part_die->highpc),
15522 part_die->offset.sect_off, objfile_name (objfile));
15525 part_die->has_pc_info = 1;
15531 /* Find a cached partial DIE at OFFSET in CU. */
15533 static struct partial_die_info *
15534 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
15536 struct partial_die_info *lookup_die = NULL;
15537 struct partial_die_info part_die;
15539 part_die.offset = offset;
15540 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
15546 /* Find a partial DIE at OFFSET, which may or may not be in CU,
15547 except in the case of .debug_types DIEs which do not reference
15548 outside their CU (they do however referencing other types via
15549 DW_FORM_ref_sig8). */
15551 static struct partial_die_info *
15552 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
15554 struct objfile *objfile = cu->objfile;
15555 struct dwarf2_per_cu_data *per_cu = NULL;
15556 struct partial_die_info *pd = NULL;
15558 if (offset_in_dwz == cu->per_cu->is_dwz
15559 && offset_in_cu_p (&cu->header, offset))
15561 pd = find_partial_die_in_comp_unit (offset, cu);
15564 /* We missed recording what we needed.
15565 Load all dies and try again. */
15566 per_cu = cu->per_cu;
15570 /* TUs don't reference other CUs/TUs (except via type signatures). */
15571 if (cu->per_cu->is_debug_types)
15573 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
15574 " external reference to offset 0x%lx [in module %s].\n"),
15575 (long) cu->header.offset.sect_off, (long) offset.sect_off,
15576 bfd_get_filename (objfile->obfd));
15578 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
15581 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
15582 load_partial_comp_unit (per_cu);
15584 per_cu->cu->last_used = 0;
15585 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15588 /* If we didn't find it, and not all dies have been loaded,
15589 load them all and try again. */
15591 if (pd == NULL && per_cu->load_all_dies == 0)
15593 per_cu->load_all_dies = 1;
15595 /* This is nasty. When we reread the DIEs, somewhere up the call chain
15596 THIS_CU->cu may already be in use. So we can't just free it and
15597 replace its DIEs with the ones we read in. Instead, we leave those
15598 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
15599 and clobber THIS_CU->cu->partial_dies with the hash table for the new
15601 load_partial_comp_unit (per_cu);
15603 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
15607 internal_error (__FILE__, __LINE__,
15608 _("could not find partial DIE 0x%x "
15609 "in cache [from module %s]\n"),
15610 offset.sect_off, bfd_get_filename (objfile->obfd));
15614 /* See if we can figure out if the class lives in a namespace. We do
15615 this by looking for a member function; its demangled name will
15616 contain namespace info, if there is any. */
15619 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
15620 struct dwarf2_cu *cu)
15622 /* NOTE: carlton/2003-10-07: Getting the info this way changes
15623 what template types look like, because the demangler
15624 frequently doesn't give the same name as the debug info. We
15625 could fix this by only using the demangled name to get the
15626 prefix (but see comment in read_structure_type). */
15628 struct partial_die_info *real_pdi;
15629 struct partial_die_info *child_pdi;
15631 /* If this DIE (this DIE's specification, if any) has a parent, then
15632 we should not do this. We'll prepend the parent's fully qualified
15633 name when we create the partial symbol. */
15635 real_pdi = struct_pdi;
15636 while (real_pdi->has_specification)
15637 real_pdi = find_partial_die (real_pdi->spec_offset,
15638 real_pdi->spec_is_dwz, cu);
15640 if (real_pdi->die_parent != NULL)
15643 for (child_pdi = struct_pdi->die_child;
15645 child_pdi = child_pdi->die_sibling)
15647 if (child_pdi->tag == DW_TAG_subprogram
15648 && child_pdi->linkage_name != NULL)
15650 char *actual_class_name
15651 = language_class_name_from_physname (cu->language_defn,
15652 child_pdi->linkage_name);
15653 if (actual_class_name != NULL)
15656 = obstack_copy0 (&cu->objfile->objfile_obstack,
15658 strlen (actual_class_name));
15659 xfree (actual_class_name);
15666 /* Adjust PART_DIE before generating a symbol for it. This function
15667 may set the is_external flag or change the DIE's name. */
15670 fixup_partial_die (struct partial_die_info *part_die,
15671 struct dwarf2_cu *cu)
15673 /* Once we've fixed up a die, there's no point in doing so again.
15674 This also avoids a memory leak if we were to call
15675 guess_partial_die_structure_name multiple times. */
15676 if (part_die->fixup_called)
15679 /* If we found a reference attribute and the DIE has no name, try
15680 to find a name in the referred to DIE. */
15682 if (part_die->name == NULL && part_die->has_specification)
15684 struct partial_die_info *spec_die;
15686 spec_die = find_partial_die (part_die->spec_offset,
15687 part_die->spec_is_dwz, cu);
15689 fixup_partial_die (spec_die, cu);
15691 if (spec_die->name)
15693 part_die->name = spec_die->name;
15695 /* Copy DW_AT_external attribute if it is set. */
15696 if (spec_die->is_external)
15697 part_die->is_external = spec_die->is_external;
15701 /* Set default names for some unnamed DIEs. */
15703 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
15704 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
15706 /* If there is no parent die to provide a namespace, and there are
15707 children, see if we can determine the namespace from their linkage
15709 if (cu->language == language_cplus
15710 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
15711 && part_die->die_parent == NULL
15712 && part_die->has_children
15713 && (part_die->tag == DW_TAG_class_type
15714 || part_die->tag == DW_TAG_structure_type
15715 || part_die->tag == DW_TAG_union_type))
15716 guess_partial_die_structure_name (part_die, cu);
15718 /* GCC might emit a nameless struct or union that has a linkage
15719 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
15720 if (part_die->name == NULL
15721 && (part_die->tag == DW_TAG_class_type
15722 || part_die->tag == DW_TAG_interface_type
15723 || part_die->tag == DW_TAG_structure_type
15724 || part_die->tag == DW_TAG_union_type)
15725 && part_die->linkage_name != NULL)
15729 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
15734 /* Strip any leading namespaces/classes, keep only the base name.
15735 DW_AT_name for named DIEs does not contain the prefixes. */
15736 base = strrchr (demangled, ':');
15737 if (base && base > demangled && base[-1] == ':')
15742 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
15743 base, strlen (base));
15748 part_die->fixup_called = 1;
15751 /* Read an attribute value described by an attribute form. */
15753 static const gdb_byte *
15754 read_attribute_value (const struct die_reader_specs *reader,
15755 struct attribute *attr, unsigned form,
15756 const gdb_byte *info_ptr)
15758 struct dwarf2_cu *cu = reader->cu;
15759 bfd *abfd = reader->abfd;
15760 struct comp_unit_head *cu_header = &cu->header;
15761 unsigned int bytes_read;
15762 struct dwarf_block *blk;
15767 case DW_FORM_ref_addr:
15768 if (cu->header.version == 2)
15769 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15771 DW_UNSND (attr) = read_offset (abfd, info_ptr,
15772 &cu->header, &bytes_read);
15773 info_ptr += bytes_read;
15775 case DW_FORM_GNU_ref_alt:
15776 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15777 info_ptr += bytes_read;
15780 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
15781 info_ptr += bytes_read;
15783 case DW_FORM_block2:
15784 blk = dwarf_alloc_block (cu);
15785 blk->size = read_2_bytes (abfd, info_ptr);
15787 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15788 info_ptr += blk->size;
15789 DW_BLOCK (attr) = blk;
15791 case DW_FORM_block4:
15792 blk = dwarf_alloc_block (cu);
15793 blk->size = read_4_bytes (abfd, info_ptr);
15795 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15796 info_ptr += blk->size;
15797 DW_BLOCK (attr) = blk;
15799 case DW_FORM_data2:
15800 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
15803 case DW_FORM_data4:
15804 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
15807 case DW_FORM_data8:
15808 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
15811 case DW_FORM_sec_offset:
15812 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
15813 info_ptr += bytes_read;
15815 case DW_FORM_string:
15816 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
15817 DW_STRING_IS_CANONICAL (attr) = 0;
15818 info_ptr += bytes_read;
15821 if (!cu->per_cu->is_dwz)
15823 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
15825 DW_STRING_IS_CANONICAL (attr) = 0;
15826 info_ptr += bytes_read;
15830 case DW_FORM_GNU_strp_alt:
15832 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15833 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
15836 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
15837 DW_STRING_IS_CANONICAL (attr) = 0;
15838 info_ptr += bytes_read;
15841 case DW_FORM_exprloc:
15842 case DW_FORM_block:
15843 blk = dwarf_alloc_block (cu);
15844 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15845 info_ptr += bytes_read;
15846 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15847 info_ptr += blk->size;
15848 DW_BLOCK (attr) = blk;
15850 case DW_FORM_block1:
15851 blk = dwarf_alloc_block (cu);
15852 blk->size = read_1_byte (abfd, info_ptr);
15854 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
15855 info_ptr += blk->size;
15856 DW_BLOCK (attr) = blk;
15858 case DW_FORM_data1:
15859 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15863 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
15866 case DW_FORM_flag_present:
15867 DW_UNSND (attr) = 1;
15869 case DW_FORM_sdata:
15870 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
15871 info_ptr += bytes_read;
15873 case DW_FORM_udata:
15874 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15875 info_ptr += bytes_read;
15878 DW_UNSND (attr) = (cu->header.offset.sect_off
15879 + read_1_byte (abfd, info_ptr));
15883 DW_UNSND (attr) = (cu->header.offset.sect_off
15884 + read_2_bytes (abfd, info_ptr));
15888 DW_UNSND (attr) = (cu->header.offset.sect_off
15889 + read_4_bytes (abfd, info_ptr));
15893 DW_UNSND (attr) = (cu->header.offset.sect_off
15894 + read_8_bytes (abfd, info_ptr));
15897 case DW_FORM_ref_sig8:
15898 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
15901 case DW_FORM_ref_udata:
15902 DW_UNSND (attr) = (cu->header.offset.sect_off
15903 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
15904 info_ptr += bytes_read;
15906 case DW_FORM_indirect:
15907 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15908 info_ptr += bytes_read;
15909 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
15911 case DW_FORM_GNU_addr_index:
15912 if (reader->dwo_file == NULL)
15914 /* For now flag a hard error.
15915 Later we can turn this into a complaint. */
15916 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15917 dwarf_form_name (form),
15918 bfd_get_filename (abfd));
15920 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
15921 info_ptr += bytes_read;
15923 case DW_FORM_GNU_str_index:
15924 if (reader->dwo_file == NULL)
15926 /* For now flag a hard error.
15927 Later we can turn this into a complaint if warranted. */
15928 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
15929 dwarf_form_name (form),
15930 bfd_get_filename (abfd));
15933 ULONGEST str_index =
15934 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15936 DW_STRING (attr) = read_str_index (reader, str_index);
15937 DW_STRING_IS_CANONICAL (attr) = 0;
15938 info_ptr += bytes_read;
15942 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
15943 dwarf_form_name (form),
15944 bfd_get_filename (abfd));
15948 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
15949 attr->form = DW_FORM_GNU_ref_alt;
15951 /* We have seen instances where the compiler tried to emit a byte
15952 size attribute of -1 which ended up being encoded as an unsigned
15953 0xffffffff. Although 0xffffffff is technically a valid size value,
15954 an object of this size seems pretty unlikely so we can relatively
15955 safely treat these cases as if the size attribute was invalid and
15956 treat them as zero by default. */
15957 if (attr->name == DW_AT_byte_size
15958 && form == DW_FORM_data4
15959 && DW_UNSND (attr) >= 0xffffffff)
15962 (&symfile_complaints,
15963 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
15964 hex_string (DW_UNSND (attr)));
15965 DW_UNSND (attr) = 0;
15971 /* Read an attribute described by an abbreviated attribute. */
15973 static const gdb_byte *
15974 read_attribute (const struct die_reader_specs *reader,
15975 struct attribute *attr, struct attr_abbrev *abbrev,
15976 const gdb_byte *info_ptr)
15978 attr->name = abbrev->name;
15979 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
15982 /* Read dwarf information from a buffer. */
15984 static unsigned int
15985 read_1_byte (bfd *abfd, const gdb_byte *buf)
15987 return bfd_get_8 (abfd, buf);
15991 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
15993 return bfd_get_signed_8 (abfd, buf);
15996 static unsigned int
15997 read_2_bytes (bfd *abfd, const gdb_byte *buf)
15999 return bfd_get_16 (abfd, buf);
16003 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16005 return bfd_get_signed_16 (abfd, buf);
16008 static unsigned int
16009 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16011 return bfd_get_32 (abfd, buf);
16015 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16017 return bfd_get_signed_32 (abfd, buf);
16021 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16023 return bfd_get_64 (abfd, buf);
16027 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16028 unsigned int *bytes_read)
16030 struct comp_unit_head *cu_header = &cu->header;
16031 CORE_ADDR retval = 0;
16033 if (cu_header->signed_addr_p)
16035 switch (cu_header->addr_size)
16038 retval = bfd_get_signed_16 (abfd, buf);
16041 retval = bfd_get_signed_32 (abfd, buf);
16044 retval = bfd_get_signed_64 (abfd, buf);
16047 internal_error (__FILE__, __LINE__,
16048 _("read_address: bad switch, signed [in module %s]"),
16049 bfd_get_filename (abfd));
16054 switch (cu_header->addr_size)
16057 retval = bfd_get_16 (abfd, buf);
16060 retval = bfd_get_32 (abfd, buf);
16063 retval = bfd_get_64 (abfd, buf);
16066 internal_error (__FILE__, __LINE__,
16067 _("read_address: bad switch, "
16068 "unsigned [in module %s]"),
16069 bfd_get_filename (abfd));
16073 *bytes_read = cu_header->addr_size;
16077 /* Read the initial length from a section. The (draft) DWARF 3
16078 specification allows the initial length to take up either 4 bytes
16079 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
16080 bytes describe the length and all offsets will be 8 bytes in length
16083 An older, non-standard 64-bit format is also handled by this
16084 function. The older format in question stores the initial length
16085 as an 8-byte quantity without an escape value. Lengths greater
16086 than 2^32 aren't very common which means that the initial 4 bytes
16087 is almost always zero. Since a length value of zero doesn't make
16088 sense for the 32-bit format, this initial zero can be considered to
16089 be an escape value which indicates the presence of the older 64-bit
16090 format. As written, the code can't detect (old format) lengths
16091 greater than 4GB. If it becomes necessary to handle lengths
16092 somewhat larger than 4GB, we could allow other small values (such
16093 as the non-sensical values of 1, 2, and 3) to also be used as
16094 escape values indicating the presence of the old format.
16096 The value returned via bytes_read should be used to increment the
16097 relevant pointer after calling read_initial_length().
16099 [ Note: read_initial_length() and read_offset() are based on the
16100 document entitled "DWARF Debugging Information Format", revision
16101 3, draft 8, dated November 19, 2001. This document was obtained
16104 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
16106 This document is only a draft and is subject to change. (So beware.)
16108 Details regarding the older, non-standard 64-bit format were
16109 determined empirically by examining 64-bit ELF files produced by
16110 the SGI toolchain on an IRIX 6.5 machine.
16112 - Kevin, July 16, 2002
16116 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
16118 LONGEST length = bfd_get_32 (abfd, buf);
16120 if (length == 0xffffffff)
16122 length = bfd_get_64 (abfd, buf + 4);
16125 else if (length == 0)
16127 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
16128 length = bfd_get_64 (abfd, buf);
16139 /* Cover function for read_initial_length.
16140 Returns the length of the object at BUF, and stores the size of the
16141 initial length in *BYTES_READ and stores the size that offsets will be in
16143 If the initial length size is not equivalent to that specified in
16144 CU_HEADER then issue a complaint.
16145 This is useful when reading non-comp-unit headers. */
16148 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
16149 const struct comp_unit_head *cu_header,
16150 unsigned int *bytes_read,
16151 unsigned int *offset_size)
16153 LONGEST length = read_initial_length (abfd, buf, bytes_read);
16155 gdb_assert (cu_header->initial_length_size == 4
16156 || cu_header->initial_length_size == 8
16157 || cu_header->initial_length_size == 12);
16159 if (cu_header->initial_length_size != *bytes_read)
16160 complaint (&symfile_complaints,
16161 _("intermixed 32-bit and 64-bit DWARF sections"));
16163 *offset_size = (*bytes_read == 4) ? 4 : 8;
16167 /* Read an offset from the data stream. The size of the offset is
16168 given by cu_header->offset_size. */
16171 read_offset (bfd *abfd, const gdb_byte *buf,
16172 const struct comp_unit_head *cu_header,
16173 unsigned int *bytes_read)
16175 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
16177 *bytes_read = cu_header->offset_size;
16181 /* Read an offset from the data stream. */
16184 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
16186 LONGEST retval = 0;
16188 switch (offset_size)
16191 retval = bfd_get_32 (abfd, buf);
16194 retval = bfd_get_64 (abfd, buf);
16197 internal_error (__FILE__, __LINE__,
16198 _("read_offset_1: bad switch [in module %s]"),
16199 bfd_get_filename (abfd));
16205 static const gdb_byte *
16206 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
16208 /* If the size of a host char is 8 bits, we can return a pointer
16209 to the buffer, otherwise we have to copy the data to a buffer
16210 allocated on the temporary obstack. */
16211 gdb_assert (HOST_CHAR_BIT == 8);
16215 static const char *
16216 read_direct_string (bfd *abfd, const gdb_byte *buf,
16217 unsigned int *bytes_read_ptr)
16219 /* If the size of a host char is 8 bits, we can return a pointer
16220 to the string, otherwise we have to copy the string to a buffer
16221 allocated on the temporary obstack. */
16222 gdb_assert (HOST_CHAR_BIT == 8);
16225 *bytes_read_ptr = 1;
16228 *bytes_read_ptr = strlen ((const char *) buf) + 1;
16229 return (const char *) buf;
16232 static const char *
16233 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
16235 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
16236 if (dwarf2_per_objfile->str.buffer == NULL)
16237 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
16238 bfd_get_filename (abfd));
16239 if (str_offset >= dwarf2_per_objfile->str.size)
16240 error (_("DW_FORM_strp pointing outside of "
16241 ".debug_str section [in module %s]"),
16242 bfd_get_filename (abfd));
16243 gdb_assert (HOST_CHAR_BIT == 8);
16244 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
16246 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
16249 /* Read a string at offset STR_OFFSET in the .debug_str section from
16250 the .dwz file DWZ. Throw an error if the offset is too large. If
16251 the string consists of a single NUL byte, return NULL; otherwise
16252 return a pointer to the string. */
16254 static const char *
16255 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
16257 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
16259 if (dwz->str.buffer == NULL)
16260 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
16261 "section [in module %s]"),
16262 bfd_get_filename (dwz->dwz_bfd));
16263 if (str_offset >= dwz->str.size)
16264 error (_("DW_FORM_GNU_strp_alt pointing outside of "
16265 ".debug_str section [in module %s]"),
16266 bfd_get_filename (dwz->dwz_bfd));
16267 gdb_assert (HOST_CHAR_BIT == 8);
16268 if (dwz->str.buffer[str_offset] == '\0')
16270 return (const char *) (dwz->str.buffer + str_offset);
16273 static const char *
16274 read_indirect_string (bfd *abfd, const gdb_byte *buf,
16275 const struct comp_unit_head *cu_header,
16276 unsigned int *bytes_read_ptr)
16278 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
16280 return read_indirect_string_at_offset (abfd, str_offset);
16284 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
16285 unsigned int *bytes_read_ptr)
16288 unsigned int num_read;
16290 unsigned char byte;
16298 byte = bfd_get_8 (abfd, buf);
16301 result |= ((ULONGEST) (byte & 127) << shift);
16302 if ((byte & 128) == 0)
16308 *bytes_read_ptr = num_read;
16313 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
16314 unsigned int *bytes_read_ptr)
16317 int i, shift, num_read;
16318 unsigned char byte;
16326 byte = bfd_get_8 (abfd, buf);
16329 result |= ((LONGEST) (byte & 127) << shift);
16331 if ((byte & 128) == 0)
16336 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
16337 result |= -(((LONGEST) 1) << shift);
16338 *bytes_read_ptr = num_read;
16342 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
16343 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
16344 ADDR_SIZE is the size of addresses from the CU header. */
16347 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
16349 struct objfile *objfile = dwarf2_per_objfile->objfile;
16350 bfd *abfd = objfile->obfd;
16351 const gdb_byte *info_ptr;
16353 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
16354 if (dwarf2_per_objfile->addr.buffer == NULL)
16355 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
16356 objfile_name (objfile));
16357 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
16358 error (_("DW_FORM_addr_index pointing outside of "
16359 ".debug_addr section [in module %s]"),
16360 objfile_name (objfile));
16361 info_ptr = (dwarf2_per_objfile->addr.buffer
16362 + addr_base + addr_index * addr_size);
16363 if (addr_size == 4)
16364 return bfd_get_32 (abfd, info_ptr);
16366 return bfd_get_64 (abfd, info_ptr);
16369 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
16372 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
16374 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
16377 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
16380 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
16381 unsigned int *bytes_read)
16383 bfd *abfd = cu->objfile->obfd;
16384 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
16386 return read_addr_index (cu, addr_index);
16389 /* Data structure to pass results from dwarf2_read_addr_index_reader
16390 back to dwarf2_read_addr_index. */
16392 struct dwarf2_read_addr_index_data
16394 ULONGEST addr_base;
16398 /* die_reader_func for dwarf2_read_addr_index. */
16401 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
16402 const gdb_byte *info_ptr,
16403 struct die_info *comp_unit_die,
16407 struct dwarf2_cu *cu = reader->cu;
16408 struct dwarf2_read_addr_index_data *aidata =
16409 (struct dwarf2_read_addr_index_data *) data;
16411 aidata->addr_base = cu->addr_base;
16412 aidata->addr_size = cu->header.addr_size;
16415 /* Given an index in .debug_addr, fetch the value.
16416 NOTE: This can be called during dwarf expression evaluation,
16417 long after the debug information has been read, and thus per_cu->cu
16418 may no longer exist. */
16421 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
16422 unsigned int addr_index)
16424 struct objfile *objfile = per_cu->objfile;
16425 struct dwarf2_cu *cu = per_cu->cu;
16426 ULONGEST addr_base;
16429 /* This is intended to be called from outside this file. */
16430 dw2_setup (objfile);
16432 /* We need addr_base and addr_size.
16433 If we don't have PER_CU->cu, we have to get it.
16434 Nasty, but the alternative is storing the needed info in PER_CU,
16435 which at this point doesn't seem justified: it's not clear how frequently
16436 it would get used and it would increase the size of every PER_CU.
16437 Entry points like dwarf2_per_cu_addr_size do a similar thing
16438 so we're not in uncharted territory here.
16439 Alas we need to be a bit more complicated as addr_base is contained
16442 We don't need to read the entire CU(/TU).
16443 We just need the header and top level die.
16445 IWBN to use the aging mechanism to let us lazily later discard the CU.
16446 For now we skip this optimization. */
16450 addr_base = cu->addr_base;
16451 addr_size = cu->header.addr_size;
16455 struct dwarf2_read_addr_index_data aidata;
16457 /* Note: We can't use init_cutu_and_read_dies_simple here,
16458 we need addr_base. */
16459 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
16460 dwarf2_read_addr_index_reader, &aidata);
16461 addr_base = aidata.addr_base;
16462 addr_size = aidata.addr_size;
16465 return read_addr_index_1 (addr_index, addr_base, addr_size);
16468 /* Given a DW_FORM_GNU_str_index, fetch the string.
16469 This is only used by the Fission support. */
16471 static const char *
16472 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
16474 struct objfile *objfile = dwarf2_per_objfile->objfile;
16475 const char *objf_name = objfile_name (objfile);
16476 bfd *abfd = objfile->obfd;
16477 struct dwarf2_cu *cu = reader->cu;
16478 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
16479 struct dwarf2_section_info *str_offsets_section =
16480 &reader->dwo_file->sections.str_offsets;
16481 const gdb_byte *info_ptr;
16482 ULONGEST str_offset;
16483 static const char form_name[] = "DW_FORM_GNU_str_index";
16485 dwarf2_read_section (objfile, str_section);
16486 dwarf2_read_section (objfile, str_offsets_section);
16487 if (str_section->buffer == NULL)
16488 error (_("%s used without .debug_str.dwo section"
16489 " in CU at offset 0x%lx [in module %s]"),
16490 form_name, (long) cu->header.offset.sect_off, objf_name);
16491 if (str_offsets_section->buffer == NULL)
16492 error (_("%s used without .debug_str_offsets.dwo section"
16493 " in CU at offset 0x%lx [in module %s]"),
16494 form_name, (long) cu->header.offset.sect_off, objf_name);
16495 if (str_index * cu->header.offset_size >= str_offsets_section->size)
16496 error (_("%s pointing outside of .debug_str_offsets.dwo"
16497 " section in CU at offset 0x%lx [in module %s]"),
16498 form_name, (long) cu->header.offset.sect_off, objf_name);
16499 info_ptr = (str_offsets_section->buffer
16500 + str_index * cu->header.offset_size);
16501 if (cu->header.offset_size == 4)
16502 str_offset = bfd_get_32 (abfd, info_ptr);
16504 str_offset = bfd_get_64 (abfd, info_ptr);
16505 if (str_offset >= str_section->size)
16506 error (_("Offset from %s pointing outside of"
16507 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
16508 form_name, (long) cu->header.offset.sect_off, objf_name);
16509 return (const char *) (str_section->buffer + str_offset);
16512 /* Return the length of an LEB128 number in BUF. */
16515 leb128_size (const gdb_byte *buf)
16517 const gdb_byte *begin = buf;
16523 if ((byte & 128) == 0)
16524 return buf - begin;
16529 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
16537 cu->language = language_c;
16539 case DW_LANG_C_plus_plus:
16540 cu->language = language_cplus;
16543 cu->language = language_d;
16545 case DW_LANG_Fortran77:
16546 case DW_LANG_Fortran90:
16547 case DW_LANG_Fortran95:
16548 cu->language = language_fortran;
16551 cu->language = language_go;
16553 case DW_LANG_Mips_Assembler:
16554 cu->language = language_asm;
16557 cu->language = language_java;
16559 case DW_LANG_Ada83:
16560 case DW_LANG_Ada95:
16561 cu->language = language_ada;
16563 case DW_LANG_Modula2:
16564 cu->language = language_m2;
16566 case DW_LANG_Pascal83:
16567 cu->language = language_pascal;
16570 cu->language = language_objc;
16572 case DW_LANG_Cobol74:
16573 case DW_LANG_Cobol85:
16575 cu->language = language_minimal;
16578 cu->language_defn = language_def (cu->language);
16581 /* Return the named attribute or NULL if not there. */
16583 static struct attribute *
16584 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
16589 struct attribute *spec = NULL;
16591 for (i = 0; i < die->num_attrs; ++i)
16593 if (die->attrs[i].name == name)
16594 return &die->attrs[i];
16595 if (die->attrs[i].name == DW_AT_specification
16596 || die->attrs[i].name == DW_AT_abstract_origin)
16597 spec = &die->attrs[i];
16603 die = follow_die_ref (die, spec, &cu);
16609 /* Return the named attribute or NULL if not there,
16610 but do not follow DW_AT_specification, etc.
16611 This is for use in contexts where we're reading .debug_types dies.
16612 Following DW_AT_specification, DW_AT_abstract_origin will take us
16613 back up the chain, and we want to go down. */
16615 static struct attribute *
16616 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
16620 for (i = 0; i < die->num_attrs; ++i)
16621 if (die->attrs[i].name == name)
16622 return &die->attrs[i];
16627 /* Return non-zero iff the attribute NAME is defined for the given DIE,
16628 and holds a non-zero value. This function should only be used for
16629 DW_FORM_flag or DW_FORM_flag_present attributes. */
16632 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
16634 struct attribute *attr = dwarf2_attr (die, name, cu);
16636 return (attr && DW_UNSND (attr));
16640 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
16642 /* A DIE is a declaration if it has a DW_AT_declaration attribute
16643 which value is non-zero. However, we have to be careful with
16644 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
16645 (via dwarf2_flag_true_p) follows this attribute. So we may
16646 end up accidently finding a declaration attribute that belongs
16647 to a different DIE referenced by the specification attribute,
16648 even though the given DIE does not have a declaration attribute. */
16649 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
16650 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
16653 /* Return the die giving the specification for DIE, if there is
16654 one. *SPEC_CU is the CU containing DIE on input, and the CU
16655 containing the return value on output. If there is no
16656 specification, but there is an abstract origin, that is
16659 static struct die_info *
16660 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
16662 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
16665 if (spec_attr == NULL)
16666 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
16668 if (spec_attr == NULL)
16671 return follow_die_ref (die, spec_attr, spec_cu);
16674 /* Free the line_header structure *LH, and any arrays and strings it
16676 NOTE: This is also used as a "cleanup" function. */
16679 free_line_header (struct line_header *lh)
16681 if (lh->standard_opcode_lengths)
16682 xfree (lh->standard_opcode_lengths);
16684 /* Remember that all the lh->file_names[i].name pointers are
16685 pointers into debug_line_buffer, and don't need to be freed. */
16686 if (lh->file_names)
16687 xfree (lh->file_names);
16689 /* Similarly for the include directory names. */
16690 if (lh->include_dirs)
16691 xfree (lh->include_dirs);
16696 /* Add an entry to LH's include directory table. */
16699 add_include_dir (struct line_header *lh, const char *include_dir)
16701 /* Grow the array if necessary. */
16702 if (lh->include_dirs_size == 0)
16704 lh->include_dirs_size = 1; /* for testing */
16705 lh->include_dirs = xmalloc (lh->include_dirs_size
16706 * sizeof (*lh->include_dirs));
16708 else if (lh->num_include_dirs >= lh->include_dirs_size)
16710 lh->include_dirs_size *= 2;
16711 lh->include_dirs = xrealloc (lh->include_dirs,
16712 (lh->include_dirs_size
16713 * sizeof (*lh->include_dirs)));
16716 lh->include_dirs[lh->num_include_dirs++] = include_dir;
16719 /* Add an entry to LH's file name table. */
16722 add_file_name (struct line_header *lh,
16724 unsigned int dir_index,
16725 unsigned int mod_time,
16726 unsigned int length)
16728 struct file_entry *fe;
16730 /* Grow the array if necessary. */
16731 if (lh->file_names_size == 0)
16733 lh->file_names_size = 1; /* for testing */
16734 lh->file_names = xmalloc (lh->file_names_size
16735 * sizeof (*lh->file_names));
16737 else if (lh->num_file_names >= lh->file_names_size)
16739 lh->file_names_size *= 2;
16740 lh->file_names = xrealloc (lh->file_names,
16741 (lh->file_names_size
16742 * sizeof (*lh->file_names)));
16745 fe = &lh->file_names[lh->num_file_names++];
16747 fe->dir_index = dir_index;
16748 fe->mod_time = mod_time;
16749 fe->length = length;
16750 fe->included_p = 0;
16754 /* A convenience function to find the proper .debug_line section for a
16757 static struct dwarf2_section_info *
16758 get_debug_line_section (struct dwarf2_cu *cu)
16760 struct dwarf2_section_info *section;
16762 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
16764 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16765 section = &cu->dwo_unit->dwo_file->sections.line;
16766 else if (cu->per_cu->is_dwz)
16768 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16770 section = &dwz->line;
16773 section = &dwarf2_per_objfile->line;
16778 /* Read the statement program header starting at OFFSET in
16779 .debug_line, or .debug_line.dwo. Return a pointer
16780 to a struct line_header, allocated using xmalloc.
16782 NOTE: the strings in the include directory and file name tables of
16783 the returned object point into the dwarf line section buffer,
16784 and must not be freed. */
16786 static struct line_header *
16787 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
16789 struct cleanup *back_to;
16790 struct line_header *lh;
16791 const gdb_byte *line_ptr;
16792 unsigned int bytes_read, offset_size;
16794 const char *cur_dir, *cur_file;
16795 struct dwarf2_section_info *section;
16798 section = get_debug_line_section (cu);
16799 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
16800 if (section->buffer == NULL)
16802 if (cu->dwo_unit && cu->per_cu->is_debug_types)
16803 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
16805 complaint (&symfile_complaints, _("missing .debug_line section"));
16809 /* We can't do this until we know the section is non-empty.
16810 Only then do we know we have such a section. */
16811 abfd = get_section_bfd_owner (section);
16813 /* Make sure that at least there's room for the total_length field.
16814 That could be 12 bytes long, but we're just going to fudge that. */
16815 if (offset + 4 >= section->size)
16817 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16821 lh = xmalloc (sizeof (*lh));
16822 memset (lh, 0, sizeof (*lh));
16823 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
16826 line_ptr = section->buffer + offset;
16828 /* Read in the header. */
16830 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
16831 &bytes_read, &offset_size);
16832 line_ptr += bytes_read;
16833 if (line_ptr + lh->total_length > (section->buffer + section->size))
16835 dwarf2_statement_list_fits_in_line_number_section_complaint ();
16836 do_cleanups (back_to);
16839 lh->statement_program_end = line_ptr + lh->total_length;
16840 lh->version = read_2_bytes (abfd, line_ptr);
16842 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
16843 line_ptr += offset_size;
16844 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
16846 if (lh->version >= 4)
16848 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
16852 lh->maximum_ops_per_instruction = 1;
16854 if (lh->maximum_ops_per_instruction == 0)
16856 lh->maximum_ops_per_instruction = 1;
16857 complaint (&symfile_complaints,
16858 _("invalid maximum_ops_per_instruction "
16859 "in `.debug_line' section"));
16862 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
16864 lh->line_base = read_1_signed_byte (abfd, line_ptr);
16866 lh->line_range = read_1_byte (abfd, line_ptr);
16868 lh->opcode_base = read_1_byte (abfd, line_ptr);
16870 lh->standard_opcode_lengths
16871 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
16873 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
16874 for (i = 1; i < lh->opcode_base; ++i)
16876 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
16880 /* Read directory table. */
16881 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16883 line_ptr += bytes_read;
16884 add_include_dir (lh, cur_dir);
16886 line_ptr += bytes_read;
16888 /* Read file name table. */
16889 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
16891 unsigned int dir_index, mod_time, length;
16893 line_ptr += bytes_read;
16894 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16895 line_ptr += bytes_read;
16896 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16897 line_ptr += bytes_read;
16898 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16899 line_ptr += bytes_read;
16901 add_file_name (lh, cur_file, dir_index, mod_time, length);
16903 line_ptr += bytes_read;
16904 lh->statement_program_start = line_ptr;
16906 if (line_ptr > (section->buffer + section->size))
16907 complaint (&symfile_complaints,
16908 _("line number info header doesn't "
16909 "fit in `.debug_line' section"));
16911 discard_cleanups (back_to);
16915 /* Subroutine of dwarf_decode_lines to simplify it.
16916 Return the file name of the psymtab for included file FILE_INDEX
16917 in line header LH of PST.
16918 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16919 If space for the result is malloc'd, it will be freed by a cleanup.
16920 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
16922 The function creates dangling cleanup registration. */
16924 static const char *
16925 psymtab_include_file_name (const struct line_header *lh, int file_index,
16926 const struct partial_symtab *pst,
16927 const char *comp_dir)
16929 const struct file_entry fe = lh->file_names [file_index];
16930 const char *include_name = fe.name;
16931 const char *include_name_to_compare = include_name;
16932 const char *dir_name = NULL;
16933 const char *pst_filename;
16934 char *copied_name = NULL;
16938 dir_name = lh->include_dirs[fe.dir_index - 1];
16940 if (!IS_ABSOLUTE_PATH (include_name)
16941 && (dir_name != NULL || comp_dir != NULL))
16943 /* Avoid creating a duplicate psymtab for PST.
16944 We do this by comparing INCLUDE_NAME and PST_FILENAME.
16945 Before we do the comparison, however, we need to account
16946 for DIR_NAME and COMP_DIR.
16947 First prepend dir_name (if non-NULL). If we still don't
16948 have an absolute path prepend comp_dir (if non-NULL).
16949 However, the directory we record in the include-file's
16950 psymtab does not contain COMP_DIR (to match the
16951 corresponding symtab(s)).
16956 bash$ gcc -g ./hello.c
16957 include_name = "hello.c"
16959 DW_AT_comp_dir = comp_dir = "/tmp"
16960 DW_AT_name = "./hello.c" */
16962 if (dir_name != NULL)
16964 char *tem = concat (dir_name, SLASH_STRING,
16965 include_name, (char *)NULL);
16967 make_cleanup (xfree, tem);
16968 include_name = tem;
16969 include_name_to_compare = include_name;
16971 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
16973 char *tem = concat (comp_dir, SLASH_STRING,
16974 include_name, (char *)NULL);
16976 make_cleanup (xfree, tem);
16977 include_name_to_compare = tem;
16981 pst_filename = pst->filename;
16982 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
16984 copied_name = concat (pst->dirname, SLASH_STRING,
16985 pst_filename, (char *)NULL);
16986 pst_filename = copied_name;
16989 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
16991 if (copied_name != NULL)
16992 xfree (copied_name);
16996 return include_name;
16999 /* Ignore this record_line request. */
17002 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
17007 /* Subroutine of dwarf_decode_lines to simplify it.
17008 Process the line number information in LH. */
17011 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
17012 struct dwarf2_cu *cu, struct partial_symtab *pst)
17014 const gdb_byte *line_ptr, *extended_end;
17015 const gdb_byte *line_end;
17016 unsigned int bytes_read, extended_len;
17017 unsigned char op_code, extended_op, adj_opcode;
17018 CORE_ADDR baseaddr;
17019 struct objfile *objfile = cu->objfile;
17020 bfd *abfd = objfile->obfd;
17021 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17022 const int decode_for_pst_p = (pst != NULL);
17023 struct subfile *last_subfile = NULL;
17024 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
17027 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17029 line_ptr = lh->statement_program_start;
17030 line_end = lh->statement_program_end;
17032 /* Read the statement sequences until there's nothing left. */
17033 while (line_ptr < line_end)
17035 /* state machine registers */
17036 CORE_ADDR address = 0;
17037 unsigned int file = 1;
17038 unsigned int line = 1;
17039 unsigned int column = 0;
17040 int is_stmt = lh->default_is_stmt;
17041 int basic_block = 0;
17042 int end_sequence = 0;
17044 unsigned char op_index = 0;
17046 if (!decode_for_pst_p && lh->num_file_names >= file)
17048 /* Start a subfile for the current file of the state machine. */
17049 /* lh->include_dirs and lh->file_names are 0-based, but the
17050 directory and file name numbers in the statement program
17052 struct file_entry *fe = &lh->file_names[file - 1];
17053 const char *dir = NULL;
17056 dir = lh->include_dirs[fe->dir_index - 1];
17058 dwarf2_start_subfile (fe->name, dir, comp_dir);
17061 /* Decode the table. */
17062 while (!end_sequence)
17064 op_code = read_1_byte (abfd, line_ptr);
17066 if (line_ptr > line_end)
17068 dwarf2_debug_line_missing_end_sequence_complaint ();
17072 if (op_code >= lh->opcode_base)
17074 /* Special operand. */
17075 adj_opcode = op_code - lh->opcode_base;
17076 address += (((op_index + (adj_opcode / lh->line_range))
17077 / lh->maximum_ops_per_instruction)
17078 * lh->minimum_instruction_length);
17079 op_index = ((op_index + (adj_opcode / lh->line_range))
17080 % lh->maximum_ops_per_instruction);
17081 line += lh->line_base + (adj_opcode % lh->line_range);
17082 if (lh->num_file_names < file || file == 0)
17083 dwarf2_debug_line_missing_file_complaint ();
17084 /* For now we ignore lines not starting on an
17085 instruction boundary. */
17086 else if (op_index == 0)
17088 lh->file_names[file - 1].included_p = 1;
17089 if (!decode_for_pst_p && is_stmt)
17091 if (last_subfile != current_subfile)
17093 addr = gdbarch_addr_bits_remove (gdbarch, address);
17095 (*p_record_line) (last_subfile, 0, addr);
17096 last_subfile = current_subfile;
17098 /* Append row to matrix using current values. */
17099 addr = gdbarch_addr_bits_remove (gdbarch, address);
17100 (*p_record_line) (current_subfile, line, addr);
17105 else switch (op_code)
17107 case DW_LNS_extended_op:
17108 extended_len = read_unsigned_leb128 (abfd, line_ptr,
17110 line_ptr += bytes_read;
17111 extended_end = line_ptr + extended_len;
17112 extended_op = read_1_byte (abfd, line_ptr);
17114 switch (extended_op)
17116 case DW_LNE_end_sequence:
17117 p_record_line = record_line;
17120 case DW_LNE_set_address:
17121 address = read_address (abfd, line_ptr, cu, &bytes_read);
17123 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
17125 /* This line table is for a function which has been
17126 GCd by the linker. Ignore it. PR gdb/12528 */
17129 = line_ptr - get_debug_line_section (cu)->buffer;
17131 complaint (&symfile_complaints,
17132 _(".debug_line address at offset 0x%lx is 0 "
17134 line_offset, objfile_name (objfile));
17135 p_record_line = noop_record_line;
17139 line_ptr += bytes_read;
17140 address += baseaddr;
17142 case DW_LNE_define_file:
17144 const char *cur_file;
17145 unsigned int dir_index, mod_time, length;
17147 cur_file = read_direct_string (abfd, line_ptr,
17149 line_ptr += bytes_read;
17151 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17152 line_ptr += bytes_read;
17154 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17155 line_ptr += bytes_read;
17157 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17158 line_ptr += bytes_read;
17159 add_file_name (lh, cur_file, dir_index, mod_time, length);
17162 case DW_LNE_set_discriminator:
17163 /* The discriminator is not interesting to the debugger;
17165 line_ptr = extended_end;
17168 complaint (&symfile_complaints,
17169 _("mangled .debug_line section"));
17172 /* Make sure that we parsed the extended op correctly. If e.g.
17173 we expected a different address size than the producer used,
17174 we may have read the wrong number of bytes. */
17175 if (line_ptr != extended_end)
17177 complaint (&symfile_complaints,
17178 _("mangled .debug_line section"));
17183 if (lh->num_file_names < file || file == 0)
17184 dwarf2_debug_line_missing_file_complaint ();
17187 lh->file_names[file - 1].included_p = 1;
17188 if (!decode_for_pst_p && is_stmt)
17190 if (last_subfile != current_subfile)
17192 addr = gdbarch_addr_bits_remove (gdbarch, address);
17194 (*p_record_line) (last_subfile, 0, addr);
17195 last_subfile = current_subfile;
17197 addr = gdbarch_addr_bits_remove (gdbarch, address);
17198 (*p_record_line) (current_subfile, line, addr);
17203 case DW_LNS_advance_pc:
17206 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17208 address += (((op_index + adjust)
17209 / lh->maximum_ops_per_instruction)
17210 * lh->minimum_instruction_length);
17211 op_index = ((op_index + adjust)
17212 % lh->maximum_ops_per_instruction);
17213 line_ptr += bytes_read;
17216 case DW_LNS_advance_line:
17217 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
17218 line_ptr += bytes_read;
17220 case DW_LNS_set_file:
17222 /* The arrays lh->include_dirs and lh->file_names are
17223 0-based, but the directory and file name numbers in
17224 the statement program are 1-based. */
17225 struct file_entry *fe;
17226 const char *dir = NULL;
17228 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17229 line_ptr += bytes_read;
17230 if (lh->num_file_names < file || file == 0)
17231 dwarf2_debug_line_missing_file_complaint ();
17234 fe = &lh->file_names[file - 1];
17236 dir = lh->include_dirs[fe->dir_index - 1];
17237 if (!decode_for_pst_p)
17239 last_subfile = current_subfile;
17240 dwarf2_start_subfile (fe->name, dir, comp_dir);
17245 case DW_LNS_set_column:
17246 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17247 line_ptr += bytes_read;
17249 case DW_LNS_negate_stmt:
17250 is_stmt = (!is_stmt);
17252 case DW_LNS_set_basic_block:
17255 /* Add to the address register of the state machine the
17256 address increment value corresponding to special opcode
17257 255. I.e., this value is scaled by the minimum
17258 instruction length since special opcode 255 would have
17259 scaled the increment. */
17260 case DW_LNS_const_add_pc:
17262 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
17264 address += (((op_index + adjust)
17265 / lh->maximum_ops_per_instruction)
17266 * lh->minimum_instruction_length);
17267 op_index = ((op_index + adjust)
17268 % lh->maximum_ops_per_instruction);
17271 case DW_LNS_fixed_advance_pc:
17272 address += read_2_bytes (abfd, line_ptr);
17278 /* Unknown standard opcode, ignore it. */
17281 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
17283 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17284 line_ptr += bytes_read;
17289 if (lh->num_file_names < file || file == 0)
17290 dwarf2_debug_line_missing_file_complaint ();
17293 lh->file_names[file - 1].included_p = 1;
17294 if (!decode_for_pst_p)
17296 addr = gdbarch_addr_bits_remove (gdbarch, address);
17297 (*p_record_line) (current_subfile, 0, addr);
17303 /* Decode the Line Number Program (LNP) for the given line_header
17304 structure and CU. The actual information extracted and the type
17305 of structures created from the LNP depends on the value of PST.
17307 1. If PST is NULL, then this procedure uses the data from the program
17308 to create all necessary symbol tables, and their linetables.
17310 2. If PST is not NULL, this procedure reads the program to determine
17311 the list of files included by the unit represented by PST, and
17312 builds all the associated partial symbol tables.
17314 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
17315 It is used for relative paths in the line table.
17316 NOTE: When processing partial symtabs (pst != NULL),
17317 comp_dir == pst->dirname.
17319 NOTE: It is important that psymtabs have the same file name (via strcmp)
17320 as the corresponding symtab. Since COMP_DIR is not used in the name of the
17321 symtab we don't use it in the name of the psymtabs we create.
17322 E.g. expand_line_sal requires this when finding psymtabs to expand.
17323 A good testcase for this is mb-inline.exp. */
17326 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
17327 struct dwarf2_cu *cu, struct partial_symtab *pst,
17328 int want_line_info)
17330 struct objfile *objfile = cu->objfile;
17331 const int decode_for_pst_p = (pst != NULL);
17332 struct subfile *first_subfile = current_subfile;
17334 if (want_line_info)
17335 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
17337 if (decode_for_pst_p)
17341 /* Now that we're done scanning the Line Header Program, we can
17342 create the psymtab of each included file. */
17343 for (file_index = 0; file_index < lh->num_file_names; file_index++)
17344 if (lh->file_names[file_index].included_p == 1)
17346 const char *include_name =
17347 psymtab_include_file_name (lh, file_index, pst, comp_dir);
17348 if (include_name != NULL)
17349 dwarf2_create_include_psymtab (include_name, pst, objfile);
17354 /* Make sure a symtab is created for every file, even files
17355 which contain only variables (i.e. no code with associated
17359 for (i = 0; i < lh->num_file_names; i++)
17361 const char *dir = NULL;
17362 struct file_entry *fe;
17364 fe = &lh->file_names[i];
17366 dir = lh->include_dirs[fe->dir_index - 1];
17367 dwarf2_start_subfile (fe->name, dir, comp_dir);
17369 /* Skip the main file; we don't need it, and it must be
17370 allocated last, so that it will show up before the
17371 non-primary symtabs in the objfile's symtab list. */
17372 if (current_subfile == first_subfile)
17375 if (current_subfile->symtab == NULL)
17376 current_subfile->symtab = allocate_symtab (current_subfile->name,
17378 fe->symtab = current_subfile->symtab;
17383 /* Start a subfile for DWARF. FILENAME is the name of the file and
17384 DIRNAME the name of the source directory which contains FILENAME
17385 or NULL if not known. COMP_DIR is the compilation directory for the
17386 linetable's compilation unit or NULL if not known.
17387 This routine tries to keep line numbers from identical absolute and
17388 relative file names in a common subfile.
17390 Using the `list' example from the GDB testsuite, which resides in
17391 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
17392 of /srcdir/list0.c yields the following debugging information for list0.c:
17394 DW_AT_name: /srcdir/list0.c
17395 DW_AT_comp_dir: /compdir
17396 files.files[0].name: list0.h
17397 files.files[0].dir: /srcdir
17398 files.files[1].name: list0.c
17399 files.files[1].dir: /srcdir
17401 The line number information for list0.c has to end up in a single
17402 subfile, so that `break /srcdir/list0.c:1' works as expected.
17403 start_subfile will ensure that this happens provided that we pass the
17404 concatenation of files.files[1].dir and files.files[1].name as the
17408 dwarf2_start_subfile (const char *filename, const char *dirname,
17409 const char *comp_dir)
17413 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
17414 `start_symtab' will always pass the contents of DW_AT_comp_dir as
17415 second argument to start_subfile. To be consistent, we do the
17416 same here. In order not to lose the line information directory,
17417 we concatenate it to the filename when it makes sense.
17418 Note that the Dwarf3 standard says (speaking of filenames in line
17419 information): ``The directory index is ignored for file names
17420 that represent full path names''. Thus ignoring dirname in the
17421 `else' branch below isn't an issue. */
17423 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
17425 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
17429 start_subfile (filename, comp_dir);
17435 /* Start a symtab for DWARF.
17436 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
17439 dwarf2_start_symtab (struct dwarf2_cu *cu,
17440 const char *name, const char *comp_dir, CORE_ADDR low_pc)
17442 start_symtab (name, comp_dir, low_pc);
17443 record_debugformat ("DWARF 2");
17444 record_producer (cu->producer);
17446 /* We assume that we're processing GCC output. */
17447 processing_gcc_compilation = 2;
17449 cu->processing_has_namespace_info = 0;
17453 var_decode_location (struct attribute *attr, struct symbol *sym,
17454 struct dwarf2_cu *cu)
17456 struct objfile *objfile = cu->objfile;
17457 struct comp_unit_head *cu_header = &cu->header;
17459 /* NOTE drow/2003-01-30: There used to be a comment and some special
17460 code here to turn a symbol with DW_AT_external and a
17461 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
17462 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
17463 with some versions of binutils) where shared libraries could have
17464 relocations against symbols in their debug information - the
17465 minimal symbol would have the right address, but the debug info
17466 would not. It's no longer necessary, because we will explicitly
17467 apply relocations when we read in the debug information now. */
17469 /* A DW_AT_location attribute with no contents indicates that a
17470 variable has been optimized away. */
17471 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
17473 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17477 /* Handle one degenerate form of location expression specially, to
17478 preserve GDB's previous behavior when section offsets are
17479 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
17480 then mark this symbol as LOC_STATIC. */
17482 if (attr_form_is_block (attr)
17483 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
17484 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
17485 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
17486 && (DW_BLOCK (attr)->size
17487 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
17489 unsigned int dummy;
17491 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
17492 SYMBOL_VALUE_ADDRESS (sym) =
17493 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
17495 SYMBOL_VALUE_ADDRESS (sym) =
17496 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
17497 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
17498 fixup_symbol_section (sym, objfile);
17499 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
17500 SYMBOL_SECTION (sym));
17504 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
17505 expression evaluator, and use LOC_COMPUTED only when necessary
17506 (i.e. when the value of a register or memory location is
17507 referenced, or a thread-local block, etc.). Then again, it might
17508 not be worthwhile. I'm assuming that it isn't unless performance
17509 or memory numbers show me otherwise. */
17511 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
17513 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
17514 cu->has_loclist = 1;
17517 /* Given a pointer to a DWARF information entry, figure out if we need
17518 to make a symbol table entry for it, and if so, create a new entry
17519 and return a pointer to it.
17520 If TYPE is NULL, determine symbol type from the die, otherwise
17521 used the passed type.
17522 If SPACE is not NULL, use it to hold the new symbol. If it is
17523 NULL, allocate a new symbol on the objfile's obstack. */
17525 static struct symbol *
17526 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
17527 struct symbol *space)
17529 struct objfile *objfile = cu->objfile;
17530 struct symbol *sym = NULL;
17532 struct attribute *attr = NULL;
17533 struct attribute *attr2 = NULL;
17534 CORE_ADDR baseaddr;
17535 struct pending **list_to_add = NULL;
17537 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
17539 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17541 name = dwarf2_name (die, cu);
17544 const char *linkagename;
17545 int suppress_add = 0;
17550 sym = allocate_symbol (objfile);
17551 OBJSTAT (objfile, n_syms++);
17553 /* Cache this symbol's name and the name's demangled form (if any). */
17554 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
17555 linkagename = dwarf2_physname (name, die, cu);
17556 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
17558 /* Fortran does not have mangling standard and the mangling does differ
17559 between gfortran, iFort etc. */
17560 if (cu->language == language_fortran
17561 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
17562 symbol_set_demangled_name (&(sym->ginfo),
17563 dwarf2_full_name (name, die, cu),
17566 /* Default assumptions.
17567 Use the passed type or decode it from the die. */
17568 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17569 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
17571 SYMBOL_TYPE (sym) = type;
17573 SYMBOL_TYPE (sym) = die_type (die, cu);
17574 attr = dwarf2_attr (die,
17575 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
17579 SYMBOL_LINE (sym) = DW_UNSND (attr);
17582 attr = dwarf2_attr (die,
17583 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
17587 int file_index = DW_UNSND (attr);
17589 if (cu->line_header == NULL
17590 || file_index > cu->line_header->num_file_names)
17591 complaint (&symfile_complaints,
17592 _("file index out of range"));
17593 else if (file_index > 0)
17595 struct file_entry *fe;
17597 fe = &cu->line_header->file_names[file_index - 1];
17598 SYMBOL_SYMTAB (sym) = fe->symtab;
17605 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
17607 SYMBOL_VALUE_ADDRESS (sym)
17608 = attr_value_as_address (attr) + baseaddr;
17609 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
17610 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
17611 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
17612 add_symbol_to_list (sym, cu->list_in_scope);
17614 case DW_TAG_subprogram:
17615 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17617 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17618 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17619 if ((attr2 && (DW_UNSND (attr2) != 0))
17620 || cu->language == language_ada)
17622 /* Subprograms marked external are stored as a global symbol.
17623 Ada subprograms, whether marked external or not, are always
17624 stored as a global symbol, because we want to be able to
17625 access them globally. For instance, we want to be able
17626 to break on a nested subprogram without having to
17627 specify the context. */
17628 list_to_add = &global_symbols;
17632 list_to_add = cu->list_in_scope;
17635 case DW_TAG_inlined_subroutine:
17636 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
17638 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
17639 SYMBOL_INLINED (sym) = 1;
17640 list_to_add = cu->list_in_scope;
17642 case DW_TAG_template_value_param:
17644 /* Fall through. */
17645 case DW_TAG_constant:
17646 case DW_TAG_variable:
17647 case DW_TAG_member:
17648 /* Compilation with minimal debug info may result in
17649 variables with missing type entries. Change the
17650 misleading `void' type to something sensible. */
17651 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
17653 = objfile_type (objfile)->nodebug_data_symbol;
17655 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17656 /* In the case of DW_TAG_member, we should only be called for
17657 static const members. */
17658 if (die->tag == DW_TAG_member)
17660 /* dwarf2_add_field uses die_is_declaration,
17661 so we do the same. */
17662 gdb_assert (die_is_declaration (die, cu));
17667 dwarf2_const_value (attr, sym, cu);
17668 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17671 if (attr2 && (DW_UNSND (attr2) != 0))
17672 list_to_add = &global_symbols;
17674 list_to_add = cu->list_in_scope;
17678 attr = dwarf2_attr (die, DW_AT_location, cu);
17681 var_decode_location (attr, sym, cu);
17682 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17684 /* Fortran explicitly imports any global symbols to the local
17685 scope by DW_TAG_common_block. */
17686 if (cu->language == language_fortran && die->parent
17687 && die->parent->tag == DW_TAG_common_block)
17690 if (SYMBOL_CLASS (sym) == LOC_STATIC
17691 && SYMBOL_VALUE_ADDRESS (sym) == 0
17692 && !dwarf2_per_objfile->has_section_at_zero)
17694 /* When a static variable is eliminated by the linker,
17695 the corresponding debug information is not stripped
17696 out, but the variable address is set to null;
17697 do not add such variables into symbol table. */
17699 else if (attr2 && (DW_UNSND (attr2) != 0))
17701 /* Workaround gfortran PR debug/40040 - it uses
17702 DW_AT_location for variables in -fPIC libraries which may
17703 get overriden by other libraries/executable and get
17704 a different address. Resolve it by the minimal symbol
17705 which may come from inferior's executable using copy
17706 relocation. Make this workaround only for gfortran as for
17707 other compilers GDB cannot guess the minimal symbol
17708 Fortran mangling kind. */
17709 if (cu->language == language_fortran && die->parent
17710 && die->parent->tag == DW_TAG_module
17712 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
17713 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17715 /* A variable with DW_AT_external is never static,
17716 but it may be block-scoped. */
17717 list_to_add = (cu->list_in_scope == &file_symbols
17718 ? &global_symbols : cu->list_in_scope);
17721 list_to_add = cu->list_in_scope;
17725 /* We do not know the address of this symbol.
17726 If it is an external symbol and we have type information
17727 for it, enter the symbol as a LOC_UNRESOLVED symbol.
17728 The address of the variable will then be determined from
17729 the minimal symbol table whenever the variable is
17731 attr2 = dwarf2_attr (die, DW_AT_external, cu);
17733 /* Fortran explicitly imports any global symbols to the local
17734 scope by DW_TAG_common_block. */
17735 if (cu->language == language_fortran && die->parent
17736 && die->parent->tag == DW_TAG_common_block)
17738 /* SYMBOL_CLASS doesn't matter here because
17739 read_common_block is going to reset it. */
17741 list_to_add = cu->list_in_scope;
17743 else if (attr2 && (DW_UNSND (attr2) != 0)
17744 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
17746 /* A variable with DW_AT_external is never static, but it
17747 may be block-scoped. */
17748 list_to_add = (cu->list_in_scope == &file_symbols
17749 ? &global_symbols : cu->list_in_scope);
17751 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
17753 else if (!die_is_declaration (die, cu))
17755 /* Use the default LOC_OPTIMIZED_OUT class. */
17756 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
17758 list_to_add = cu->list_in_scope;
17762 case DW_TAG_formal_parameter:
17763 /* If we are inside a function, mark this as an argument. If
17764 not, we might be looking at an argument to an inlined function
17765 when we do not have enough information to show inlined frames;
17766 pretend it's a local variable in that case so that the user can
17768 if (context_stack_depth > 0
17769 && context_stack[context_stack_depth - 1].name != NULL)
17770 SYMBOL_IS_ARGUMENT (sym) = 1;
17771 attr = dwarf2_attr (die, DW_AT_location, cu);
17774 var_decode_location (attr, sym, cu);
17776 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17779 dwarf2_const_value (attr, sym, cu);
17782 list_to_add = cu->list_in_scope;
17784 case DW_TAG_unspecified_parameters:
17785 /* From varargs functions; gdb doesn't seem to have any
17786 interest in this information, so just ignore it for now.
17789 case DW_TAG_template_type_param:
17791 /* Fall through. */
17792 case DW_TAG_class_type:
17793 case DW_TAG_interface_type:
17794 case DW_TAG_structure_type:
17795 case DW_TAG_union_type:
17796 case DW_TAG_set_type:
17797 case DW_TAG_enumeration_type:
17798 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17799 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
17802 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
17803 really ever be static objects: otherwise, if you try
17804 to, say, break of a class's method and you're in a file
17805 which doesn't mention that class, it won't work unless
17806 the check for all static symbols in lookup_symbol_aux
17807 saves you. See the OtherFileClass tests in
17808 gdb.c++/namespace.exp. */
17812 list_to_add = (cu->list_in_scope == &file_symbols
17813 && (cu->language == language_cplus
17814 || cu->language == language_java)
17815 ? &global_symbols : cu->list_in_scope);
17817 /* The semantics of C++ state that "struct foo {
17818 ... }" also defines a typedef for "foo". A Java
17819 class declaration also defines a typedef for the
17821 if (cu->language == language_cplus
17822 || cu->language == language_java
17823 || cu->language == language_ada)
17825 /* The symbol's name is already allocated along
17826 with this objfile, so we don't need to
17827 duplicate it for the type. */
17828 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
17829 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
17834 case DW_TAG_typedef:
17835 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17836 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17837 list_to_add = cu->list_in_scope;
17839 case DW_TAG_base_type:
17840 case DW_TAG_subrange_type:
17841 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17842 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
17843 list_to_add = cu->list_in_scope;
17845 case DW_TAG_enumerator:
17846 attr = dwarf2_attr (die, DW_AT_const_value, cu);
17849 dwarf2_const_value (attr, sym, cu);
17852 /* NOTE: carlton/2003-11-10: See comment above in the
17853 DW_TAG_class_type, etc. block. */
17855 list_to_add = (cu->list_in_scope == &file_symbols
17856 && (cu->language == language_cplus
17857 || cu->language == language_java)
17858 ? &global_symbols : cu->list_in_scope);
17861 case DW_TAG_imported_declaration:
17862 case DW_TAG_namespace:
17863 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17864 list_to_add = &global_symbols;
17866 case DW_TAG_module:
17867 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
17868 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
17869 list_to_add = &global_symbols;
17871 case DW_TAG_common_block:
17872 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
17873 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
17874 add_symbol_to_list (sym, cu->list_in_scope);
17877 /* Not a tag we recognize. Hopefully we aren't processing
17878 trash data, but since we must specifically ignore things
17879 we don't recognize, there is nothing else we should do at
17881 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
17882 dwarf_tag_name (die->tag));
17888 sym->hash_next = objfile->template_symbols;
17889 objfile->template_symbols = sym;
17890 list_to_add = NULL;
17893 if (list_to_add != NULL)
17894 add_symbol_to_list (sym, list_to_add);
17896 /* For the benefit of old versions of GCC, check for anonymous
17897 namespaces based on the demangled name. */
17898 if (!cu->processing_has_namespace_info
17899 && cu->language == language_cplus)
17900 cp_scan_for_anonymous_namespaces (sym, objfile);
17905 /* A wrapper for new_symbol_full that always allocates a new symbol. */
17907 static struct symbol *
17908 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
17910 return new_symbol_full (die, type, cu, NULL);
17913 /* Given an attr with a DW_FORM_dataN value in host byte order,
17914 zero-extend it as appropriate for the symbol's type. The DWARF
17915 standard (v4) is not entirely clear about the meaning of using
17916 DW_FORM_dataN for a constant with a signed type, where the type is
17917 wider than the data. The conclusion of a discussion on the DWARF
17918 list was that this is unspecified. We choose to always zero-extend
17919 because that is the interpretation long in use by GCC. */
17922 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
17923 struct dwarf2_cu *cu, LONGEST *value, int bits)
17925 struct objfile *objfile = cu->objfile;
17926 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
17927 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
17928 LONGEST l = DW_UNSND (attr);
17930 if (bits < sizeof (*value) * 8)
17932 l &= ((LONGEST) 1 << bits) - 1;
17935 else if (bits == sizeof (*value) * 8)
17939 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
17940 store_unsigned_integer (bytes, bits / 8, byte_order, l);
17947 /* Read a constant value from an attribute. Either set *VALUE, or if
17948 the value does not fit in *VALUE, set *BYTES - either already
17949 allocated on the objfile obstack, or newly allocated on OBSTACK,
17950 or, set *BATON, if we translated the constant to a location
17954 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
17955 const char *name, struct obstack *obstack,
17956 struct dwarf2_cu *cu,
17957 LONGEST *value, const gdb_byte **bytes,
17958 struct dwarf2_locexpr_baton **baton)
17960 struct objfile *objfile = cu->objfile;
17961 struct comp_unit_head *cu_header = &cu->header;
17962 struct dwarf_block *blk;
17963 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
17964 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
17970 switch (attr->form)
17973 case DW_FORM_GNU_addr_index:
17977 if (TYPE_LENGTH (type) != cu_header->addr_size)
17978 dwarf2_const_value_length_mismatch_complaint (name,
17979 cu_header->addr_size,
17980 TYPE_LENGTH (type));
17981 /* Symbols of this form are reasonably rare, so we just
17982 piggyback on the existing location code rather than writing
17983 a new implementation of symbol_computed_ops. */
17984 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
17985 (*baton)->per_cu = cu->per_cu;
17986 gdb_assert ((*baton)->per_cu);
17988 (*baton)->size = 2 + cu_header->addr_size;
17989 data = obstack_alloc (obstack, (*baton)->size);
17990 (*baton)->data = data;
17992 data[0] = DW_OP_addr;
17993 store_unsigned_integer (&data[1], cu_header->addr_size,
17994 byte_order, DW_ADDR (attr));
17995 data[cu_header->addr_size + 1] = DW_OP_stack_value;
17998 case DW_FORM_string:
18000 case DW_FORM_GNU_str_index:
18001 case DW_FORM_GNU_strp_alt:
18002 /* DW_STRING is already allocated on the objfile obstack, point
18004 *bytes = (const gdb_byte *) DW_STRING (attr);
18006 case DW_FORM_block1:
18007 case DW_FORM_block2:
18008 case DW_FORM_block4:
18009 case DW_FORM_block:
18010 case DW_FORM_exprloc:
18011 blk = DW_BLOCK (attr);
18012 if (TYPE_LENGTH (type) != blk->size)
18013 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
18014 TYPE_LENGTH (type));
18015 *bytes = blk->data;
18018 /* The DW_AT_const_value attributes are supposed to carry the
18019 symbol's value "represented as it would be on the target
18020 architecture." By the time we get here, it's already been
18021 converted to host endianness, so we just need to sign- or
18022 zero-extend it as appropriate. */
18023 case DW_FORM_data1:
18024 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
18026 case DW_FORM_data2:
18027 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
18029 case DW_FORM_data4:
18030 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
18032 case DW_FORM_data8:
18033 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
18036 case DW_FORM_sdata:
18037 *value = DW_SND (attr);
18040 case DW_FORM_udata:
18041 *value = DW_UNSND (attr);
18045 complaint (&symfile_complaints,
18046 _("unsupported const value attribute form: '%s'"),
18047 dwarf_form_name (attr->form));
18054 /* Copy constant value from an attribute to a symbol. */
18057 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
18058 struct dwarf2_cu *cu)
18060 struct objfile *objfile = cu->objfile;
18061 struct comp_unit_head *cu_header = &cu->header;
18063 const gdb_byte *bytes;
18064 struct dwarf2_locexpr_baton *baton;
18066 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
18067 SYMBOL_PRINT_NAME (sym),
18068 &objfile->objfile_obstack, cu,
18069 &value, &bytes, &baton);
18073 SYMBOL_LOCATION_BATON (sym) = baton;
18074 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
18076 else if (bytes != NULL)
18078 SYMBOL_VALUE_BYTES (sym) = bytes;
18079 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
18083 SYMBOL_VALUE (sym) = value;
18084 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
18088 /* Return the type of the die in question using its DW_AT_type attribute. */
18090 static struct type *
18091 die_type (struct die_info *die, struct dwarf2_cu *cu)
18093 struct attribute *type_attr;
18095 type_attr = dwarf2_attr (die, DW_AT_type, cu);
18098 /* A missing DW_AT_type represents a void type. */
18099 return objfile_type (cu->objfile)->builtin_void;
18102 return lookup_die_type (die, type_attr, cu);
18105 /* True iff CU's producer generates GNAT Ada auxiliary information
18106 that allows to find parallel types through that information instead
18107 of having to do expensive parallel lookups by type name. */
18110 need_gnat_info (struct dwarf2_cu *cu)
18112 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
18113 of GNAT produces this auxiliary information, without any indication
18114 that it is produced. Part of enhancing the FSF version of GNAT
18115 to produce that information will be to put in place an indicator
18116 that we can use in order to determine whether the descriptive type
18117 info is available or not. One suggestion that has been made is
18118 to use a new attribute, attached to the CU die. For now, assume
18119 that the descriptive type info is not available. */
18123 /* Return the auxiliary type of the die in question using its
18124 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
18125 attribute is not present. */
18127 static struct type *
18128 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
18130 struct attribute *type_attr;
18132 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
18136 return lookup_die_type (die, type_attr, cu);
18139 /* If DIE has a descriptive_type attribute, then set the TYPE's
18140 descriptive type accordingly. */
18143 set_descriptive_type (struct type *type, struct die_info *die,
18144 struct dwarf2_cu *cu)
18146 struct type *descriptive_type = die_descriptive_type (die, cu);
18148 if (descriptive_type)
18150 ALLOCATE_GNAT_AUX_TYPE (type);
18151 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
18155 /* Return the containing type of the die in question using its
18156 DW_AT_containing_type attribute. */
18158 static struct type *
18159 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
18161 struct attribute *type_attr;
18163 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
18165 error (_("Dwarf Error: Problem turning containing type into gdb type "
18166 "[in module %s]"), objfile_name (cu->objfile));
18168 return lookup_die_type (die, type_attr, cu);
18171 /* Return an error marker type to use for the ill formed type in DIE/CU. */
18173 static struct type *
18174 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
18176 struct objfile *objfile = dwarf2_per_objfile->objfile;
18177 char *message, *saved;
18179 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
18180 objfile_name (objfile),
18181 cu->header.offset.sect_off,
18182 die->offset.sect_off);
18183 saved = obstack_copy0 (&objfile->objfile_obstack,
18184 message, strlen (message));
18187 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
18190 /* Look up the type of DIE in CU using its type attribute ATTR.
18191 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
18192 DW_AT_containing_type.
18193 If there is no type substitute an error marker. */
18195 static struct type *
18196 lookup_die_type (struct die_info *die, const struct attribute *attr,
18197 struct dwarf2_cu *cu)
18199 struct objfile *objfile = cu->objfile;
18200 struct type *this_type;
18202 gdb_assert (attr->name == DW_AT_type
18203 || attr->name == DW_AT_GNAT_descriptive_type
18204 || attr->name == DW_AT_containing_type);
18206 /* First see if we have it cached. */
18208 if (attr->form == DW_FORM_GNU_ref_alt)
18210 struct dwarf2_per_cu_data *per_cu;
18211 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18213 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
18214 this_type = get_die_type_at_offset (offset, per_cu);
18216 else if (attr_form_is_ref (attr))
18218 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18220 this_type = get_die_type_at_offset (offset, cu->per_cu);
18222 else if (attr->form == DW_FORM_ref_sig8)
18224 ULONGEST signature = DW_SIGNATURE (attr);
18226 return get_signatured_type (die, signature, cu);
18230 complaint (&symfile_complaints,
18231 _("Dwarf Error: Bad type attribute %s in DIE"
18232 " at 0x%x [in module %s]"),
18233 dwarf_attr_name (attr->name), die->offset.sect_off,
18234 objfile_name (objfile));
18235 return build_error_marker_type (cu, die);
18238 /* If not cached we need to read it in. */
18240 if (this_type == NULL)
18242 struct die_info *type_die = NULL;
18243 struct dwarf2_cu *type_cu = cu;
18245 if (attr_form_is_ref (attr))
18246 type_die = follow_die_ref (die, attr, &type_cu);
18247 if (type_die == NULL)
18248 return build_error_marker_type (cu, die);
18249 /* If we find the type now, it's probably because the type came
18250 from an inter-CU reference and the type's CU got expanded before
18252 this_type = read_type_die (type_die, type_cu);
18255 /* If we still don't have a type use an error marker. */
18257 if (this_type == NULL)
18258 return build_error_marker_type (cu, die);
18263 /* Return the type in DIE, CU.
18264 Returns NULL for invalid types.
18266 This first does a lookup in die_type_hash,
18267 and only reads the die in if necessary.
18269 NOTE: This can be called when reading in partial or full symbols. */
18271 static struct type *
18272 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
18274 struct type *this_type;
18276 this_type = get_die_type (die, cu);
18280 return read_type_die_1 (die, cu);
18283 /* Read the type in DIE, CU.
18284 Returns NULL for invalid types. */
18286 static struct type *
18287 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
18289 struct type *this_type = NULL;
18293 case DW_TAG_class_type:
18294 case DW_TAG_interface_type:
18295 case DW_TAG_structure_type:
18296 case DW_TAG_union_type:
18297 this_type = read_structure_type (die, cu);
18299 case DW_TAG_enumeration_type:
18300 this_type = read_enumeration_type (die, cu);
18302 case DW_TAG_subprogram:
18303 case DW_TAG_subroutine_type:
18304 case DW_TAG_inlined_subroutine:
18305 this_type = read_subroutine_type (die, cu);
18307 case DW_TAG_array_type:
18308 this_type = read_array_type (die, cu);
18310 case DW_TAG_set_type:
18311 this_type = read_set_type (die, cu);
18313 case DW_TAG_pointer_type:
18314 this_type = read_tag_pointer_type (die, cu);
18316 case DW_TAG_ptr_to_member_type:
18317 this_type = read_tag_ptr_to_member_type (die, cu);
18319 case DW_TAG_reference_type:
18320 this_type = read_tag_reference_type (die, cu);
18322 case DW_TAG_const_type:
18323 this_type = read_tag_const_type (die, cu);
18325 case DW_TAG_volatile_type:
18326 this_type = read_tag_volatile_type (die, cu);
18328 case DW_TAG_restrict_type:
18329 this_type = read_tag_restrict_type (die, cu);
18331 case DW_TAG_string_type:
18332 this_type = read_tag_string_type (die, cu);
18334 case DW_TAG_typedef:
18335 this_type = read_typedef (die, cu);
18337 case DW_TAG_subrange_type:
18338 this_type = read_subrange_type (die, cu);
18340 case DW_TAG_base_type:
18341 this_type = read_base_type (die, cu);
18343 case DW_TAG_unspecified_type:
18344 this_type = read_unspecified_type (die, cu);
18346 case DW_TAG_namespace:
18347 this_type = read_namespace_type (die, cu);
18349 case DW_TAG_module:
18350 this_type = read_module_type (die, cu);
18353 complaint (&symfile_complaints,
18354 _("unexpected tag in read_type_die: '%s'"),
18355 dwarf_tag_name (die->tag));
18362 /* See if we can figure out if the class lives in a namespace. We do
18363 this by looking for a member function; its demangled name will
18364 contain namespace info, if there is any.
18365 Return the computed name or NULL.
18366 Space for the result is allocated on the objfile's obstack.
18367 This is the full-die version of guess_partial_die_structure_name.
18368 In this case we know DIE has no useful parent. */
18371 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
18373 struct die_info *spec_die;
18374 struct dwarf2_cu *spec_cu;
18375 struct die_info *child;
18378 spec_die = die_specification (die, &spec_cu);
18379 if (spec_die != NULL)
18385 for (child = die->child;
18387 child = child->sibling)
18389 if (child->tag == DW_TAG_subprogram)
18391 struct attribute *attr;
18393 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
18395 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
18399 = language_class_name_from_physname (cu->language_defn,
18403 if (actual_name != NULL)
18405 const char *die_name = dwarf2_name (die, cu);
18407 if (die_name != NULL
18408 && strcmp (die_name, actual_name) != 0)
18410 /* Strip off the class name from the full name.
18411 We want the prefix. */
18412 int die_name_len = strlen (die_name);
18413 int actual_name_len = strlen (actual_name);
18415 /* Test for '::' as a sanity check. */
18416 if (actual_name_len > die_name_len + 2
18417 && actual_name[actual_name_len
18418 - die_name_len - 1] == ':')
18420 obstack_copy0 (&cu->objfile->objfile_obstack,
18422 actual_name_len - die_name_len - 2);
18425 xfree (actual_name);
18434 /* GCC might emit a nameless typedef that has a linkage name. Determine the
18435 prefix part in such case. See
18436 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18439 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
18441 struct attribute *attr;
18444 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
18445 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
18448 attr = dwarf2_attr (die, DW_AT_name, cu);
18449 if (attr != NULL && DW_STRING (attr) != NULL)
18452 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18454 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18455 if (attr == NULL || DW_STRING (attr) == NULL)
18458 /* dwarf2_name had to be already called. */
18459 gdb_assert (DW_STRING_IS_CANONICAL (attr));
18461 /* Strip the base name, keep any leading namespaces/classes. */
18462 base = strrchr (DW_STRING (attr), ':');
18463 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
18466 return obstack_copy0 (&cu->objfile->objfile_obstack,
18467 DW_STRING (attr), &base[-1] - DW_STRING (attr));
18470 /* Return the name of the namespace/class that DIE is defined within,
18471 or "" if we can't tell. The caller should not xfree the result.
18473 For example, if we're within the method foo() in the following
18483 then determine_prefix on foo's die will return "N::C". */
18485 static const char *
18486 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
18488 struct die_info *parent, *spec_die;
18489 struct dwarf2_cu *spec_cu;
18490 struct type *parent_type;
18493 if (cu->language != language_cplus && cu->language != language_java
18494 && cu->language != language_fortran)
18497 retval = anonymous_struct_prefix (die, cu);
18501 /* We have to be careful in the presence of DW_AT_specification.
18502 For example, with GCC 3.4, given the code
18506 // Definition of N::foo.
18510 then we'll have a tree of DIEs like this:
18512 1: DW_TAG_compile_unit
18513 2: DW_TAG_namespace // N
18514 3: DW_TAG_subprogram // declaration of N::foo
18515 4: DW_TAG_subprogram // definition of N::foo
18516 DW_AT_specification // refers to die #3
18518 Thus, when processing die #4, we have to pretend that we're in
18519 the context of its DW_AT_specification, namely the contex of die
18522 spec_die = die_specification (die, &spec_cu);
18523 if (spec_die == NULL)
18524 parent = die->parent;
18527 parent = spec_die->parent;
18531 if (parent == NULL)
18533 else if (parent->building_fullname)
18536 const char *parent_name;
18538 /* It has been seen on RealView 2.2 built binaries,
18539 DW_TAG_template_type_param types actually _defined_ as
18540 children of the parent class:
18543 template class <class Enum> Class{};
18544 Class<enum E> class_e;
18546 1: DW_TAG_class_type (Class)
18547 2: DW_TAG_enumeration_type (E)
18548 3: DW_TAG_enumerator (enum1:0)
18549 3: DW_TAG_enumerator (enum2:1)
18551 2: DW_TAG_template_type_param
18552 DW_AT_type DW_FORM_ref_udata (E)
18554 Besides being broken debug info, it can put GDB into an
18555 infinite loop. Consider:
18557 When we're building the full name for Class<E>, we'll start
18558 at Class, and go look over its template type parameters,
18559 finding E. We'll then try to build the full name of E, and
18560 reach here. We're now trying to build the full name of E,
18561 and look over the parent DIE for containing scope. In the
18562 broken case, if we followed the parent DIE of E, we'd again
18563 find Class, and once again go look at its template type
18564 arguments, etc., etc. Simply don't consider such parent die
18565 as source-level parent of this die (it can't be, the language
18566 doesn't allow it), and break the loop here. */
18567 name = dwarf2_name (die, cu);
18568 parent_name = dwarf2_name (parent, cu);
18569 complaint (&symfile_complaints,
18570 _("template param type '%s' defined within parent '%s'"),
18571 name ? name : "<unknown>",
18572 parent_name ? parent_name : "<unknown>");
18576 switch (parent->tag)
18578 case DW_TAG_namespace:
18579 parent_type = read_type_die (parent, cu);
18580 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
18581 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
18582 Work around this problem here. */
18583 if (cu->language == language_cplus
18584 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
18586 /* We give a name to even anonymous namespaces. */
18587 return TYPE_TAG_NAME (parent_type);
18588 case DW_TAG_class_type:
18589 case DW_TAG_interface_type:
18590 case DW_TAG_structure_type:
18591 case DW_TAG_union_type:
18592 case DW_TAG_module:
18593 parent_type = read_type_die (parent, cu);
18594 if (TYPE_TAG_NAME (parent_type) != NULL)
18595 return TYPE_TAG_NAME (parent_type);
18597 /* An anonymous structure is only allowed non-static data
18598 members; no typedefs, no member functions, et cetera.
18599 So it does not need a prefix. */
18601 case DW_TAG_compile_unit:
18602 case DW_TAG_partial_unit:
18603 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
18604 if (cu->language == language_cplus
18605 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
18606 && die->child != NULL
18607 && (die->tag == DW_TAG_class_type
18608 || die->tag == DW_TAG_structure_type
18609 || die->tag == DW_TAG_union_type))
18611 char *name = guess_full_die_structure_name (die, cu);
18616 case DW_TAG_enumeration_type:
18617 parent_type = read_type_die (parent, cu);
18618 if (TYPE_DECLARED_CLASS (parent_type))
18620 if (TYPE_TAG_NAME (parent_type) != NULL)
18621 return TYPE_TAG_NAME (parent_type);
18624 /* Fall through. */
18626 return determine_prefix (parent, cu);
18630 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
18631 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
18632 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
18633 an obconcat, otherwise allocate storage for the result. The CU argument is
18634 used to determine the language and hence, the appropriate separator. */
18636 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
18639 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
18640 int physname, struct dwarf2_cu *cu)
18642 const char *lead = "";
18645 if (suffix == NULL || suffix[0] == '\0'
18646 || prefix == NULL || prefix[0] == '\0')
18648 else if (cu->language == language_java)
18650 else if (cu->language == language_fortran && physname)
18652 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
18653 DW_AT_MIPS_linkage_name is preferred and used instead. */
18661 if (prefix == NULL)
18663 if (suffix == NULL)
18669 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
18671 strcpy (retval, lead);
18672 strcat (retval, prefix);
18673 strcat (retval, sep);
18674 strcat (retval, suffix);
18679 /* We have an obstack. */
18680 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
18684 /* Return sibling of die, NULL if no sibling. */
18686 static struct die_info *
18687 sibling_die (struct die_info *die)
18689 return die->sibling;
18692 /* Get name of a die, return NULL if not found. */
18694 static const char *
18695 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
18696 struct obstack *obstack)
18698 if (name && cu->language == language_cplus)
18700 char *canon_name = cp_canonicalize_string (name);
18702 if (canon_name != NULL)
18704 if (strcmp (canon_name, name) != 0)
18705 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
18706 xfree (canon_name);
18713 /* Get name of a die, return NULL if not found. */
18715 static const char *
18716 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
18718 struct attribute *attr;
18720 attr = dwarf2_attr (die, DW_AT_name, cu);
18721 if ((!attr || !DW_STRING (attr))
18722 && die->tag != DW_TAG_class_type
18723 && die->tag != DW_TAG_interface_type
18724 && die->tag != DW_TAG_structure_type
18725 && die->tag != DW_TAG_union_type)
18730 case DW_TAG_compile_unit:
18731 case DW_TAG_partial_unit:
18732 /* Compilation units have a DW_AT_name that is a filename, not
18733 a source language identifier. */
18734 case DW_TAG_enumeration_type:
18735 case DW_TAG_enumerator:
18736 /* These tags always have simple identifiers already; no need
18737 to canonicalize them. */
18738 return DW_STRING (attr);
18740 case DW_TAG_subprogram:
18741 /* Java constructors will all be named "<init>", so return
18742 the class name when we see this special case. */
18743 if (cu->language == language_java
18744 && DW_STRING (attr) != NULL
18745 && strcmp (DW_STRING (attr), "<init>") == 0)
18747 struct dwarf2_cu *spec_cu = cu;
18748 struct die_info *spec_die;
18750 /* GCJ will output '<init>' for Java constructor names.
18751 For this special case, return the name of the parent class. */
18753 /* GCJ may output suprogram DIEs with AT_specification set.
18754 If so, use the name of the specified DIE. */
18755 spec_die = die_specification (die, &spec_cu);
18756 if (spec_die != NULL)
18757 return dwarf2_name (spec_die, spec_cu);
18762 if (die->tag == DW_TAG_class_type)
18763 return dwarf2_name (die, cu);
18765 while (die->tag != DW_TAG_compile_unit
18766 && die->tag != DW_TAG_partial_unit);
18770 case DW_TAG_class_type:
18771 case DW_TAG_interface_type:
18772 case DW_TAG_structure_type:
18773 case DW_TAG_union_type:
18774 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
18775 structures or unions. These were of the form "._%d" in GCC 4.1,
18776 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
18777 and GCC 4.4. We work around this problem by ignoring these. */
18778 if (attr && DW_STRING (attr)
18779 && (strncmp (DW_STRING (attr), "._", 2) == 0
18780 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
18783 /* GCC might emit a nameless typedef that has a linkage name. See
18784 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18785 if (!attr || DW_STRING (attr) == NULL)
18787 char *demangled = NULL;
18789 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
18791 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
18793 if (attr == NULL || DW_STRING (attr) == NULL)
18796 /* Avoid demangling DW_STRING (attr) the second time on a second
18797 call for the same DIE. */
18798 if (!DW_STRING_IS_CANONICAL (attr))
18799 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
18805 /* FIXME: we already did this for the partial symbol... */
18806 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
18807 demangled, strlen (demangled));
18808 DW_STRING_IS_CANONICAL (attr) = 1;
18811 /* Strip any leading namespaces/classes, keep only the base name.
18812 DW_AT_name for named DIEs does not contain the prefixes. */
18813 base = strrchr (DW_STRING (attr), ':');
18814 if (base && base > DW_STRING (attr) && base[-1] == ':')
18817 return DW_STRING (attr);
18826 if (!DW_STRING_IS_CANONICAL (attr))
18829 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
18830 &cu->objfile->objfile_obstack);
18831 DW_STRING_IS_CANONICAL (attr) = 1;
18833 return DW_STRING (attr);
18836 /* Return the die that this die in an extension of, or NULL if there
18837 is none. *EXT_CU is the CU containing DIE on input, and the CU
18838 containing the return value on output. */
18840 static struct die_info *
18841 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
18843 struct attribute *attr;
18845 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
18849 return follow_die_ref (die, attr, ext_cu);
18852 /* Convert a DIE tag into its string name. */
18854 static const char *
18855 dwarf_tag_name (unsigned tag)
18857 const char *name = get_DW_TAG_name (tag);
18860 return "DW_TAG_<unknown>";
18865 /* Convert a DWARF attribute code into its string name. */
18867 static const char *
18868 dwarf_attr_name (unsigned attr)
18872 #ifdef MIPS /* collides with DW_AT_HP_block_index */
18873 if (attr == DW_AT_MIPS_fde)
18874 return "DW_AT_MIPS_fde";
18876 if (attr == DW_AT_HP_block_index)
18877 return "DW_AT_HP_block_index";
18880 name = get_DW_AT_name (attr);
18883 return "DW_AT_<unknown>";
18888 /* Convert a DWARF value form code into its string name. */
18890 static const char *
18891 dwarf_form_name (unsigned form)
18893 const char *name = get_DW_FORM_name (form);
18896 return "DW_FORM_<unknown>";
18902 dwarf_bool_name (unsigned mybool)
18910 /* Convert a DWARF type code into its string name. */
18912 static const char *
18913 dwarf_type_encoding_name (unsigned enc)
18915 const char *name = get_DW_ATE_name (enc);
18918 return "DW_ATE_<unknown>";
18924 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
18928 print_spaces (indent, f);
18929 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
18930 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
18932 if (die->parent != NULL)
18934 print_spaces (indent, f);
18935 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
18936 die->parent->offset.sect_off);
18939 print_spaces (indent, f);
18940 fprintf_unfiltered (f, " has children: %s\n",
18941 dwarf_bool_name (die->child != NULL));
18943 print_spaces (indent, f);
18944 fprintf_unfiltered (f, " attributes:\n");
18946 for (i = 0; i < die->num_attrs; ++i)
18948 print_spaces (indent, f);
18949 fprintf_unfiltered (f, " %s (%s) ",
18950 dwarf_attr_name (die->attrs[i].name),
18951 dwarf_form_name (die->attrs[i].form));
18953 switch (die->attrs[i].form)
18956 case DW_FORM_GNU_addr_index:
18957 fprintf_unfiltered (f, "address: ");
18958 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
18960 case DW_FORM_block2:
18961 case DW_FORM_block4:
18962 case DW_FORM_block:
18963 case DW_FORM_block1:
18964 fprintf_unfiltered (f, "block: size %s",
18965 pulongest (DW_BLOCK (&die->attrs[i])->size));
18967 case DW_FORM_exprloc:
18968 fprintf_unfiltered (f, "expression: size %s",
18969 pulongest (DW_BLOCK (&die->attrs[i])->size));
18971 case DW_FORM_ref_addr:
18972 fprintf_unfiltered (f, "ref address: ");
18973 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
18975 case DW_FORM_GNU_ref_alt:
18976 fprintf_unfiltered (f, "alt ref address: ");
18977 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
18983 case DW_FORM_ref_udata:
18984 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
18985 (long) (DW_UNSND (&die->attrs[i])));
18987 case DW_FORM_data1:
18988 case DW_FORM_data2:
18989 case DW_FORM_data4:
18990 case DW_FORM_data8:
18991 case DW_FORM_udata:
18992 case DW_FORM_sdata:
18993 fprintf_unfiltered (f, "constant: %s",
18994 pulongest (DW_UNSND (&die->attrs[i])));
18996 case DW_FORM_sec_offset:
18997 fprintf_unfiltered (f, "section offset: %s",
18998 pulongest (DW_UNSND (&die->attrs[i])));
19000 case DW_FORM_ref_sig8:
19001 fprintf_unfiltered (f, "signature: %s",
19002 hex_string (DW_SIGNATURE (&die->attrs[i])));
19004 case DW_FORM_string:
19006 case DW_FORM_GNU_str_index:
19007 case DW_FORM_GNU_strp_alt:
19008 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
19009 DW_STRING (&die->attrs[i])
19010 ? DW_STRING (&die->attrs[i]) : "",
19011 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
19014 if (DW_UNSND (&die->attrs[i]))
19015 fprintf_unfiltered (f, "flag: TRUE");
19017 fprintf_unfiltered (f, "flag: FALSE");
19019 case DW_FORM_flag_present:
19020 fprintf_unfiltered (f, "flag: TRUE");
19022 case DW_FORM_indirect:
19023 /* The reader will have reduced the indirect form to
19024 the "base form" so this form should not occur. */
19025 fprintf_unfiltered (f,
19026 "unexpected attribute form: DW_FORM_indirect");
19029 fprintf_unfiltered (f, "unsupported attribute form: %d.",
19030 die->attrs[i].form);
19033 fprintf_unfiltered (f, "\n");
19038 dump_die_for_error (struct die_info *die)
19040 dump_die_shallow (gdb_stderr, 0, die);
19044 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
19046 int indent = level * 4;
19048 gdb_assert (die != NULL);
19050 if (level >= max_level)
19053 dump_die_shallow (f, indent, die);
19055 if (die->child != NULL)
19057 print_spaces (indent, f);
19058 fprintf_unfiltered (f, " Children:");
19059 if (level + 1 < max_level)
19061 fprintf_unfiltered (f, "\n");
19062 dump_die_1 (f, level + 1, max_level, die->child);
19066 fprintf_unfiltered (f,
19067 " [not printed, max nesting level reached]\n");
19071 if (die->sibling != NULL && level > 0)
19073 dump_die_1 (f, level, max_level, die->sibling);
19077 /* This is called from the pdie macro in gdbinit.in.
19078 It's not static so gcc will keep a copy callable from gdb. */
19081 dump_die (struct die_info *die, int max_level)
19083 dump_die_1 (gdb_stdlog, 0, max_level, die);
19087 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
19091 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
19097 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
19101 dwarf2_get_ref_die_offset (const struct attribute *attr)
19103 sect_offset retval = { DW_UNSND (attr) };
19105 if (attr_form_is_ref (attr))
19108 retval.sect_off = 0;
19109 complaint (&symfile_complaints,
19110 _("unsupported die ref attribute form: '%s'"),
19111 dwarf_form_name (attr->form));
19115 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
19116 * the value held by the attribute is not constant. */
19119 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
19121 if (attr->form == DW_FORM_sdata)
19122 return DW_SND (attr);
19123 else if (attr->form == DW_FORM_udata
19124 || attr->form == DW_FORM_data1
19125 || attr->form == DW_FORM_data2
19126 || attr->form == DW_FORM_data4
19127 || attr->form == DW_FORM_data8)
19128 return DW_UNSND (attr);
19131 complaint (&symfile_complaints,
19132 _("Attribute value is not a constant (%s)"),
19133 dwarf_form_name (attr->form));
19134 return default_value;
19138 /* Follow reference or signature attribute ATTR of SRC_DIE.
19139 On entry *REF_CU is the CU of SRC_DIE.
19140 On exit *REF_CU is the CU of the result. */
19142 static struct die_info *
19143 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
19144 struct dwarf2_cu **ref_cu)
19146 struct die_info *die;
19148 if (attr_form_is_ref (attr))
19149 die = follow_die_ref (src_die, attr, ref_cu);
19150 else if (attr->form == DW_FORM_ref_sig8)
19151 die = follow_die_sig (src_die, attr, ref_cu);
19154 dump_die_for_error (src_die);
19155 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
19156 objfile_name ((*ref_cu)->objfile));
19162 /* Follow reference OFFSET.
19163 On entry *REF_CU is the CU of the source die referencing OFFSET.
19164 On exit *REF_CU is the CU of the result.
19165 Returns NULL if OFFSET is invalid. */
19167 static struct die_info *
19168 follow_die_offset (sect_offset offset, int offset_in_dwz,
19169 struct dwarf2_cu **ref_cu)
19171 struct die_info temp_die;
19172 struct dwarf2_cu *target_cu, *cu = *ref_cu;
19174 gdb_assert (cu->per_cu != NULL);
19178 if (cu->per_cu->is_debug_types)
19180 /* .debug_types CUs cannot reference anything outside their CU.
19181 If they need to, they have to reference a signatured type via
19182 DW_FORM_ref_sig8. */
19183 if (! offset_in_cu_p (&cu->header, offset))
19186 else if (offset_in_dwz != cu->per_cu->is_dwz
19187 || ! offset_in_cu_p (&cu->header, offset))
19189 struct dwarf2_per_cu_data *per_cu;
19191 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
19194 /* If necessary, add it to the queue and load its DIEs. */
19195 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
19196 load_full_comp_unit (per_cu, cu->language);
19198 target_cu = per_cu->cu;
19200 else if (cu->dies == NULL)
19202 /* We're loading full DIEs during partial symbol reading. */
19203 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
19204 load_full_comp_unit (cu->per_cu, language_minimal);
19207 *ref_cu = target_cu;
19208 temp_die.offset = offset;
19209 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
19212 /* Follow reference attribute ATTR of SRC_DIE.
19213 On entry *REF_CU is the CU of SRC_DIE.
19214 On exit *REF_CU is the CU of the result. */
19216 static struct die_info *
19217 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
19218 struct dwarf2_cu **ref_cu)
19220 sect_offset offset = dwarf2_get_ref_die_offset (attr);
19221 struct dwarf2_cu *cu = *ref_cu;
19222 struct die_info *die;
19224 die = follow_die_offset (offset,
19225 (attr->form == DW_FORM_GNU_ref_alt
19226 || cu->per_cu->is_dwz),
19229 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
19230 "at 0x%x [in module %s]"),
19231 offset.sect_off, src_die->offset.sect_off,
19232 objfile_name (cu->objfile));
19237 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
19238 Returned value is intended for DW_OP_call*. Returned
19239 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
19241 struct dwarf2_locexpr_baton
19242 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
19243 struct dwarf2_per_cu_data *per_cu,
19244 CORE_ADDR (*get_frame_pc) (void *baton),
19247 struct dwarf2_cu *cu;
19248 struct die_info *die;
19249 struct attribute *attr;
19250 struct dwarf2_locexpr_baton retval;
19252 dw2_setup (per_cu->objfile);
19254 if (per_cu->cu == NULL)
19258 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19260 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19261 offset.sect_off, objfile_name (per_cu->objfile));
19263 attr = dwarf2_attr (die, DW_AT_location, cu);
19266 /* DWARF: "If there is no such attribute, then there is no effect.".
19267 DATA is ignored if SIZE is 0. */
19269 retval.data = NULL;
19272 else if (attr_form_is_section_offset (attr))
19274 struct dwarf2_loclist_baton loclist_baton;
19275 CORE_ADDR pc = (*get_frame_pc) (baton);
19278 fill_in_loclist_baton (cu, &loclist_baton, attr);
19280 retval.data = dwarf2_find_location_expression (&loclist_baton,
19282 retval.size = size;
19286 if (!attr_form_is_block (attr))
19287 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
19288 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
19289 offset.sect_off, objfile_name (per_cu->objfile));
19291 retval.data = DW_BLOCK (attr)->data;
19292 retval.size = DW_BLOCK (attr)->size;
19294 retval.per_cu = cu->per_cu;
19296 age_cached_comp_units ();
19301 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
19304 struct dwarf2_locexpr_baton
19305 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
19306 struct dwarf2_per_cu_data *per_cu,
19307 CORE_ADDR (*get_frame_pc) (void *baton),
19310 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
19312 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
19315 /* Write a constant of a given type as target-ordered bytes into
19318 static const gdb_byte *
19319 write_constant_as_bytes (struct obstack *obstack,
19320 enum bfd_endian byte_order,
19327 *len = TYPE_LENGTH (type);
19328 result = obstack_alloc (obstack, *len);
19329 store_unsigned_integer (result, *len, byte_order, value);
19334 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
19335 pointer to the constant bytes and set LEN to the length of the
19336 data. If memory is needed, allocate it on OBSTACK. If the DIE
19337 does not have a DW_AT_const_value, return NULL. */
19340 dwarf2_fetch_constant_bytes (sect_offset offset,
19341 struct dwarf2_per_cu_data *per_cu,
19342 struct obstack *obstack,
19345 struct dwarf2_cu *cu;
19346 struct die_info *die;
19347 struct attribute *attr;
19348 const gdb_byte *result = NULL;
19351 enum bfd_endian byte_order;
19353 dw2_setup (per_cu->objfile);
19355 if (per_cu->cu == NULL)
19359 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
19361 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
19362 offset.sect_off, objfile_name (per_cu->objfile));
19365 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19369 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
19370 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19372 switch (attr->form)
19375 case DW_FORM_GNU_addr_index:
19379 *len = cu->header.addr_size;
19380 tem = obstack_alloc (obstack, *len);
19381 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
19385 case DW_FORM_string:
19387 case DW_FORM_GNU_str_index:
19388 case DW_FORM_GNU_strp_alt:
19389 /* DW_STRING is already allocated on the objfile obstack, point
19391 result = (const gdb_byte *) DW_STRING (attr);
19392 *len = strlen (DW_STRING (attr));
19394 case DW_FORM_block1:
19395 case DW_FORM_block2:
19396 case DW_FORM_block4:
19397 case DW_FORM_block:
19398 case DW_FORM_exprloc:
19399 result = DW_BLOCK (attr)->data;
19400 *len = DW_BLOCK (attr)->size;
19403 /* The DW_AT_const_value attributes are supposed to carry the
19404 symbol's value "represented as it would be on the target
19405 architecture." By the time we get here, it's already been
19406 converted to host endianness, so we just need to sign- or
19407 zero-extend it as appropriate. */
19408 case DW_FORM_data1:
19409 type = die_type (die, cu);
19410 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
19411 if (result == NULL)
19412 result = write_constant_as_bytes (obstack, byte_order,
19415 case DW_FORM_data2:
19416 type = die_type (die, cu);
19417 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
19418 if (result == NULL)
19419 result = write_constant_as_bytes (obstack, byte_order,
19422 case DW_FORM_data4:
19423 type = die_type (die, cu);
19424 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
19425 if (result == NULL)
19426 result = write_constant_as_bytes (obstack, byte_order,
19429 case DW_FORM_data8:
19430 type = die_type (die, cu);
19431 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
19432 if (result == NULL)
19433 result = write_constant_as_bytes (obstack, byte_order,
19437 case DW_FORM_sdata:
19438 type = die_type (die, cu);
19439 result = write_constant_as_bytes (obstack, byte_order,
19440 type, DW_SND (attr), len);
19443 case DW_FORM_udata:
19444 type = die_type (die, cu);
19445 result = write_constant_as_bytes (obstack, byte_order,
19446 type, DW_UNSND (attr), len);
19450 complaint (&symfile_complaints,
19451 _("unsupported const value attribute form: '%s'"),
19452 dwarf_form_name (attr->form));
19459 /* Return the type of the DIE at DIE_OFFSET in the CU named by
19463 dwarf2_get_die_type (cu_offset die_offset,
19464 struct dwarf2_per_cu_data *per_cu)
19466 sect_offset die_offset_sect;
19468 dw2_setup (per_cu->objfile);
19470 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
19471 return get_die_type_at_offset (die_offset_sect, per_cu);
19474 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
19475 On entry *REF_CU is the CU of SRC_DIE.
19476 On exit *REF_CU is the CU of the result.
19477 Returns NULL if the referenced DIE isn't found. */
19479 static struct die_info *
19480 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
19481 struct dwarf2_cu **ref_cu)
19483 struct objfile *objfile = (*ref_cu)->objfile;
19484 struct die_info temp_die;
19485 struct dwarf2_cu *sig_cu;
19486 struct die_info *die;
19488 /* While it might be nice to assert sig_type->type == NULL here,
19489 we can get here for DW_AT_imported_declaration where we need
19490 the DIE not the type. */
19492 /* If necessary, add it to the queue and load its DIEs. */
19494 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
19495 read_signatured_type (sig_type);
19497 sig_cu = sig_type->per_cu.cu;
19498 gdb_assert (sig_cu != NULL);
19499 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
19500 temp_die.offset = sig_type->type_offset_in_section;
19501 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
19502 temp_die.offset.sect_off);
19505 /* For .gdb_index version 7 keep track of included TUs.
19506 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
19507 if (dwarf2_per_objfile->index_table != NULL
19508 && dwarf2_per_objfile->index_table->version <= 7)
19510 VEC_safe_push (dwarf2_per_cu_ptr,
19511 (*ref_cu)->per_cu->imported_symtabs,
19522 /* Follow signatured type referenced by ATTR in SRC_DIE.
19523 On entry *REF_CU is the CU of SRC_DIE.
19524 On exit *REF_CU is the CU of the result.
19525 The result is the DIE of the type.
19526 If the referenced type cannot be found an error is thrown. */
19528 static struct die_info *
19529 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
19530 struct dwarf2_cu **ref_cu)
19532 ULONGEST signature = DW_SIGNATURE (attr);
19533 struct signatured_type *sig_type;
19534 struct die_info *die;
19536 gdb_assert (attr->form == DW_FORM_ref_sig8);
19538 sig_type = lookup_signatured_type (*ref_cu, signature);
19539 /* sig_type will be NULL if the signatured type is missing from
19541 if (sig_type == NULL)
19543 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
19544 " from DIE at 0x%x [in module %s]"),
19545 hex_string (signature), src_die->offset.sect_off,
19546 objfile_name ((*ref_cu)->objfile));
19549 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
19552 dump_die_for_error (src_die);
19553 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
19554 " from DIE at 0x%x [in module %s]"),
19555 hex_string (signature), src_die->offset.sect_off,
19556 objfile_name ((*ref_cu)->objfile));
19562 /* Get the type specified by SIGNATURE referenced in DIE/CU,
19563 reading in and processing the type unit if necessary. */
19565 static struct type *
19566 get_signatured_type (struct die_info *die, ULONGEST signature,
19567 struct dwarf2_cu *cu)
19569 struct signatured_type *sig_type;
19570 struct dwarf2_cu *type_cu;
19571 struct die_info *type_die;
19574 sig_type = lookup_signatured_type (cu, signature);
19575 /* sig_type will be NULL if the signatured type is missing from
19577 if (sig_type == NULL)
19579 complaint (&symfile_complaints,
19580 _("Dwarf Error: Cannot find signatured DIE %s referenced"
19581 " from DIE at 0x%x [in module %s]"),
19582 hex_string (signature), die->offset.sect_off,
19583 objfile_name (dwarf2_per_objfile->objfile));
19584 return build_error_marker_type (cu, die);
19587 /* If we already know the type we're done. */
19588 if (sig_type->type != NULL)
19589 return sig_type->type;
19592 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
19593 if (type_die != NULL)
19595 /* N.B. We need to call get_die_type to ensure only one type for this DIE
19596 is created. This is important, for example, because for c++ classes
19597 we need TYPE_NAME set which is only done by new_symbol. Blech. */
19598 type = read_type_die (type_die, type_cu);
19601 complaint (&symfile_complaints,
19602 _("Dwarf Error: Cannot build signatured type %s"
19603 " referenced from DIE at 0x%x [in module %s]"),
19604 hex_string (signature), die->offset.sect_off,
19605 objfile_name (dwarf2_per_objfile->objfile));
19606 type = build_error_marker_type (cu, die);
19611 complaint (&symfile_complaints,
19612 _("Dwarf Error: Problem reading signatured DIE %s referenced"
19613 " from DIE at 0x%x [in module %s]"),
19614 hex_string (signature), die->offset.sect_off,
19615 objfile_name (dwarf2_per_objfile->objfile));
19616 type = build_error_marker_type (cu, die);
19618 sig_type->type = type;
19623 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
19624 reading in and processing the type unit if necessary. */
19626 static struct type *
19627 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
19628 struct dwarf2_cu *cu) /* ARI: editCase function */
19630 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
19631 if (attr_form_is_ref (attr))
19633 struct dwarf2_cu *type_cu = cu;
19634 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
19636 return read_type_die (type_die, type_cu);
19638 else if (attr->form == DW_FORM_ref_sig8)
19640 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
19644 complaint (&symfile_complaints,
19645 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
19646 " at 0x%x [in module %s]"),
19647 dwarf_form_name (attr->form), die->offset.sect_off,
19648 objfile_name (dwarf2_per_objfile->objfile));
19649 return build_error_marker_type (cu, die);
19653 /* Load the DIEs associated with type unit PER_CU into memory. */
19656 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
19658 struct signatured_type *sig_type;
19660 /* Caller is responsible for ensuring type_unit_groups don't get here. */
19661 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
19663 /* We have the per_cu, but we need the signatured_type.
19664 Fortunately this is an easy translation. */
19665 gdb_assert (per_cu->is_debug_types);
19666 sig_type = (struct signatured_type *) per_cu;
19668 gdb_assert (per_cu->cu == NULL);
19670 read_signatured_type (sig_type);
19672 gdb_assert (per_cu->cu != NULL);
19675 /* die_reader_func for read_signatured_type.
19676 This is identical to load_full_comp_unit_reader,
19677 but is kept separate for now. */
19680 read_signatured_type_reader (const struct die_reader_specs *reader,
19681 const gdb_byte *info_ptr,
19682 struct die_info *comp_unit_die,
19686 struct dwarf2_cu *cu = reader->cu;
19688 gdb_assert (cu->die_hash == NULL);
19690 htab_create_alloc_ex (cu->header.length / 12,
19694 &cu->comp_unit_obstack,
19695 hashtab_obstack_allocate,
19696 dummy_obstack_deallocate);
19699 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
19700 &info_ptr, comp_unit_die);
19701 cu->dies = comp_unit_die;
19702 /* comp_unit_die is not stored in die_hash, no need. */
19704 /* We try not to read any attributes in this function, because not
19705 all CUs needed for references have been loaded yet, and symbol
19706 table processing isn't initialized. But we have to set the CU language,
19707 or we won't be able to build types correctly.
19708 Similarly, if we do not read the producer, we can not apply
19709 producer-specific interpretation. */
19710 prepare_one_comp_unit (cu, cu->dies, language_minimal);
19713 /* Read in a signatured type and build its CU and DIEs.
19714 If the type is a stub for the real type in a DWO file,
19715 read in the real type from the DWO file as well. */
19718 read_signatured_type (struct signatured_type *sig_type)
19720 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
19722 gdb_assert (per_cu->is_debug_types);
19723 gdb_assert (per_cu->cu == NULL);
19725 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
19726 read_signatured_type_reader, NULL);
19727 sig_type->per_cu.tu_read = 1;
19730 /* Decode simple location descriptions.
19731 Given a pointer to a dwarf block that defines a location, compute
19732 the location and return the value.
19734 NOTE drow/2003-11-18: This function is called in two situations
19735 now: for the address of static or global variables (partial symbols
19736 only) and for offsets into structures which are expected to be
19737 (more or less) constant. The partial symbol case should go away,
19738 and only the constant case should remain. That will let this
19739 function complain more accurately. A few special modes are allowed
19740 without complaint for global variables (for instance, global
19741 register values and thread-local values).
19743 A location description containing no operations indicates that the
19744 object is optimized out. The return value is 0 for that case.
19745 FIXME drow/2003-11-16: No callers check for this case any more; soon all
19746 callers will only want a very basic result and this can become a
19749 Note that stack[0] is unused except as a default error return. */
19752 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
19754 struct objfile *objfile = cu->objfile;
19756 size_t size = blk->size;
19757 const gdb_byte *data = blk->data;
19758 CORE_ADDR stack[64];
19760 unsigned int bytes_read, unsnd;
19766 stack[++stacki] = 0;
19805 stack[++stacki] = op - DW_OP_lit0;
19840 stack[++stacki] = op - DW_OP_reg0;
19842 dwarf2_complex_location_expr_complaint ();
19846 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
19848 stack[++stacki] = unsnd;
19850 dwarf2_complex_location_expr_complaint ();
19854 stack[++stacki] = read_address (objfile->obfd, &data[i],
19859 case DW_OP_const1u:
19860 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
19864 case DW_OP_const1s:
19865 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
19869 case DW_OP_const2u:
19870 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
19874 case DW_OP_const2s:
19875 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
19879 case DW_OP_const4u:
19880 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
19884 case DW_OP_const4s:
19885 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
19889 case DW_OP_const8u:
19890 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
19895 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
19901 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
19906 stack[stacki + 1] = stack[stacki];
19911 stack[stacki - 1] += stack[stacki];
19915 case DW_OP_plus_uconst:
19916 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
19922 stack[stacki - 1] -= stack[stacki];
19927 /* If we're not the last op, then we definitely can't encode
19928 this using GDB's address_class enum. This is valid for partial
19929 global symbols, although the variable's address will be bogus
19932 dwarf2_complex_location_expr_complaint ();
19935 case DW_OP_GNU_push_tls_address:
19936 /* The top of the stack has the offset from the beginning
19937 of the thread control block at which the variable is located. */
19938 /* Nothing should follow this operator, so the top of stack would
19940 /* This is valid for partial global symbols, but the variable's
19941 address will be bogus in the psymtab. Make it always at least
19942 non-zero to not look as a variable garbage collected by linker
19943 which have DW_OP_addr 0. */
19945 dwarf2_complex_location_expr_complaint ();
19949 case DW_OP_GNU_uninit:
19952 case DW_OP_GNU_addr_index:
19953 case DW_OP_GNU_const_index:
19954 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
19961 const char *name = get_DW_OP_name (op);
19964 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
19967 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
19971 return (stack[stacki]);
19974 /* Enforce maximum stack depth of SIZE-1 to avoid writing
19975 outside of the allocated space. Also enforce minimum>0. */
19976 if (stacki >= ARRAY_SIZE (stack) - 1)
19978 complaint (&symfile_complaints,
19979 _("location description stack overflow"));
19985 complaint (&symfile_complaints,
19986 _("location description stack underflow"));
19990 return (stack[stacki]);
19993 /* memory allocation interface */
19995 static struct dwarf_block *
19996 dwarf_alloc_block (struct dwarf2_cu *cu)
19998 struct dwarf_block *blk;
20000 blk = (struct dwarf_block *)
20001 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
20005 static struct die_info *
20006 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
20008 struct die_info *die;
20009 size_t size = sizeof (struct die_info);
20012 size += (num_attrs - 1) * sizeof (struct attribute);
20014 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
20015 memset (die, 0, sizeof (struct die_info));
20020 /* Macro support. */
20022 /* Return file name relative to the compilation directory of file number I in
20023 *LH's file name table. The result is allocated using xmalloc; the caller is
20024 responsible for freeing it. */
20027 file_file_name (int file, struct line_header *lh)
20029 /* Is the file number a valid index into the line header's file name
20030 table? Remember that file numbers start with one, not zero. */
20031 if (1 <= file && file <= lh->num_file_names)
20033 struct file_entry *fe = &lh->file_names[file - 1];
20035 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
20036 return xstrdup (fe->name);
20037 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
20042 /* The compiler produced a bogus file number. We can at least
20043 record the macro definitions made in the file, even if we
20044 won't be able to find the file by name. */
20045 char fake_name[80];
20047 xsnprintf (fake_name, sizeof (fake_name),
20048 "<bad macro file number %d>", file);
20050 complaint (&symfile_complaints,
20051 _("bad file number in macro information (%d)"),
20054 return xstrdup (fake_name);
20058 /* Return the full name of file number I in *LH's file name table.
20059 Use COMP_DIR as the name of the current directory of the
20060 compilation. The result is allocated using xmalloc; the caller is
20061 responsible for freeing it. */
20063 file_full_name (int file, struct line_header *lh, const char *comp_dir)
20065 /* Is the file number a valid index into the line header's file name
20066 table? Remember that file numbers start with one, not zero. */
20067 if (1 <= file && file <= lh->num_file_names)
20069 char *relative = file_file_name (file, lh);
20071 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
20073 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
20076 return file_file_name (file, lh);
20080 static struct macro_source_file *
20081 macro_start_file (int file, int line,
20082 struct macro_source_file *current_file,
20083 const char *comp_dir,
20084 struct line_header *lh, struct objfile *objfile)
20086 /* File name relative to the compilation directory of this source file. */
20087 char *file_name = file_file_name (file, lh);
20089 if (! current_file)
20091 /* Note: We don't create a macro table for this compilation unit
20092 at all until we actually get a filename. */
20093 struct macro_table *macro_table = get_macro_table (objfile, comp_dir);
20095 /* If we have no current file, then this must be the start_file
20096 directive for the compilation unit's main source file. */
20097 current_file = macro_set_main (macro_table, file_name);
20098 macro_define_special (macro_table);
20101 current_file = macro_include (current_file, line, file_name);
20105 return current_file;
20109 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
20110 followed by a null byte. */
20112 copy_string (const char *buf, int len)
20114 char *s = xmalloc (len + 1);
20116 memcpy (s, buf, len);
20122 static const char *
20123 consume_improper_spaces (const char *p, const char *body)
20127 complaint (&symfile_complaints,
20128 _("macro definition contains spaces "
20129 "in formal argument list:\n`%s'"),
20141 parse_macro_definition (struct macro_source_file *file, int line,
20146 /* The body string takes one of two forms. For object-like macro
20147 definitions, it should be:
20149 <macro name> " " <definition>
20151 For function-like macro definitions, it should be:
20153 <macro name> "() " <definition>
20155 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
20157 Spaces may appear only where explicitly indicated, and in the
20160 The Dwarf 2 spec says that an object-like macro's name is always
20161 followed by a space, but versions of GCC around March 2002 omit
20162 the space when the macro's definition is the empty string.
20164 The Dwarf 2 spec says that there should be no spaces between the
20165 formal arguments in a function-like macro's formal argument list,
20166 but versions of GCC around March 2002 include spaces after the
20170 /* Find the extent of the macro name. The macro name is terminated
20171 by either a space or null character (for an object-like macro) or
20172 an opening paren (for a function-like macro). */
20173 for (p = body; *p; p++)
20174 if (*p == ' ' || *p == '(')
20177 if (*p == ' ' || *p == '\0')
20179 /* It's an object-like macro. */
20180 int name_len = p - body;
20181 char *name = copy_string (body, name_len);
20182 const char *replacement;
20185 replacement = body + name_len + 1;
20188 dwarf2_macro_malformed_definition_complaint (body);
20189 replacement = body + name_len;
20192 macro_define_object (file, line, name, replacement);
20196 else if (*p == '(')
20198 /* It's a function-like macro. */
20199 char *name = copy_string (body, p - body);
20202 char **argv = xmalloc (argv_size * sizeof (*argv));
20206 p = consume_improper_spaces (p, body);
20208 /* Parse the formal argument list. */
20209 while (*p && *p != ')')
20211 /* Find the extent of the current argument name. */
20212 const char *arg_start = p;
20214 while (*p && *p != ',' && *p != ')' && *p != ' ')
20217 if (! *p || p == arg_start)
20218 dwarf2_macro_malformed_definition_complaint (body);
20221 /* Make sure argv has room for the new argument. */
20222 if (argc >= argv_size)
20225 argv = xrealloc (argv, argv_size * sizeof (*argv));
20228 argv[argc++] = copy_string (arg_start, p - arg_start);
20231 p = consume_improper_spaces (p, body);
20233 /* Consume the comma, if present. */
20238 p = consume_improper_spaces (p, body);
20247 /* Perfectly formed definition, no complaints. */
20248 macro_define_function (file, line, name,
20249 argc, (const char **) argv,
20251 else if (*p == '\0')
20253 /* Complain, but do define it. */
20254 dwarf2_macro_malformed_definition_complaint (body);
20255 macro_define_function (file, line, name,
20256 argc, (const char **) argv,
20260 /* Just complain. */
20261 dwarf2_macro_malformed_definition_complaint (body);
20264 /* Just complain. */
20265 dwarf2_macro_malformed_definition_complaint (body);
20271 for (i = 0; i < argc; i++)
20277 dwarf2_macro_malformed_definition_complaint (body);
20280 /* Skip some bytes from BYTES according to the form given in FORM.
20281 Returns the new pointer. */
20283 static const gdb_byte *
20284 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
20285 enum dwarf_form form,
20286 unsigned int offset_size,
20287 struct dwarf2_section_info *section)
20289 unsigned int bytes_read;
20293 case DW_FORM_data1:
20298 case DW_FORM_data2:
20302 case DW_FORM_data4:
20306 case DW_FORM_data8:
20310 case DW_FORM_string:
20311 read_direct_string (abfd, bytes, &bytes_read);
20312 bytes += bytes_read;
20315 case DW_FORM_sec_offset:
20317 case DW_FORM_GNU_strp_alt:
20318 bytes += offset_size;
20321 case DW_FORM_block:
20322 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
20323 bytes += bytes_read;
20326 case DW_FORM_block1:
20327 bytes += 1 + read_1_byte (abfd, bytes);
20329 case DW_FORM_block2:
20330 bytes += 2 + read_2_bytes (abfd, bytes);
20332 case DW_FORM_block4:
20333 bytes += 4 + read_4_bytes (abfd, bytes);
20336 case DW_FORM_sdata:
20337 case DW_FORM_udata:
20338 case DW_FORM_GNU_addr_index:
20339 case DW_FORM_GNU_str_index:
20340 bytes = gdb_skip_leb128 (bytes, buffer_end);
20343 dwarf2_section_buffer_overflow_complaint (section);
20351 complaint (&symfile_complaints,
20352 _("invalid form 0x%x in `%s'"),
20353 form, get_section_name (section));
20361 /* A helper for dwarf_decode_macros that handles skipping an unknown
20362 opcode. Returns an updated pointer to the macro data buffer; or,
20363 on error, issues a complaint and returns NULL. */
20365 static const gdb_byte *
20366 skip_unknown_opcode (unsigned int opcode,
20367 const gdb_byte **opcode_definitions,
20368 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20370 unsigned int offset_size,
20371 struct dwarf2_section_info *section)
20373 unsigned int bytes_read, i;
20375 const gdb_byte *defn;
20377 if (opcode_definitions[opcode] == NULL)
20379 complaint (&symfile_complaints,
20380 _("unrecognized DW_MACFINO opcode 0x%x"),
20385 defn = opcode_definitions[opcode];
20386 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
20387 defn += bytes_read;
20389 for (i = 0; i < arg; ++i)
20391 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
20393 if (mac_ptr == NULL)
20395 /* skip_form_bytes already issued the complaint. */
20403 /* A helper function which parses the header of a macro section.
20404 If the macro section is the extended (for now called "GNU") type,
20405 then this updates *OFFSET_SIZE. Returns a pointer to just after
20406 the header, or issues a complaint and returns NULL on error. */
20408 static const gdb_byte *
20409 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
20411 const gdb_byte *mac_ptr,
20412 unsigned int *offset_size,
20413 int section_is_gnu)
20415 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
20417 if (section_is_gnu)
20419 unsigned int version, flags;
20421 version = read_2_bytes (abfd, mac_ptr);
20424 complaint (&symfile_complaints,
20425 _("unrecognized version `%d' in .debug_macro section"),
20431 flags = read_1_byte (abfd, mac_ptr);
20433 *offset_size = (flags & 1) ? 8 : 4;
20435 if ((flags & 2) != 0)
20436 /* We don't need the line table offset. */
20437 mac_ptr += *offset_size;
20439 /* Vendor opcode descriptions. */
20440 if ((flags & 4) != 0)
20442 unsigned int i, count;
20444 count = read_1_byte (abfd, mac_ptr);
20446 for (i = 0; i < count; ++i)
20448 unsigned int opcode, bytes_read;
20451 opcode = read_1_byte (abfd, mac_ptr);
20453 opcode_definitions[opcode] = mac_ptr;
20454 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20455 mac_ptr += bytes_read;
20464 /* A helper for dwarf_decode_macros that handles the GNU extensions,
20465 including DW_MACRO_GNU_transparent_include. */
20468 dwarf_decode_macro_bytes (bfd *abfd,
20469 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
20470 struct macro_source_file *current_file,
20471 struct line_header *lh, const char *comp_dir,
20472 struct dwarf2_section_info *section,
20473 int section_is_gnu, int section_is_dwz,
20474 unsigned int offset_size,
20475 struct objfile *objfile,
20476 htab_t include_hash)
20478 enum dwarf_macro_record_type macinfo_type;
20479 int at_commandline;
20480 const gdb_byte *opcode_definitions[256];
20482 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20483 &offset_size, section_is_gnu);
20484 if (mac_ptr == NULL)
20486 /* We already issued a complaint. */
20490 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
20491 GDB is still reading the definitions from command line. First
20492 DW_MACINFO_start_file will need to be ignored as it was already executed
20493 to create CURRENT_FILE for the main source holding also the command line
20494 definitions. On first met DW_MACINFO_start_file this flag is reset to
20495 normally execute all the remaining DW_MACINFO_start_file macinfos. */
20497 at_commandline = 1;
20501 /* Do we at least have room for a macinfo type byte? */
20502 if (mac_ptr >= mac_end)
20504 dwarf2_section_buffer_overflow_complaint (section);
20508 macinfo_type = read_1_byte (abfd, mac_ptr);
20511 /* Note that we rely on the fact that the corresponding GNU and
20512 DWARF constants are the same. */
20513 switch (macinfo_type)
20515 /* A zero macinfo type indicates the end of the macro
20520 case DW_MACRO_GNU_define:
20521 case DW_MACRO_GNU_undef:
20522 case DW_MACRO_GNU_define_indirect:
20523 case DW_MACRO_GNU_undef_indirect:
20524 case DW_MACRO_GNU_define_indirect_alt:
20525 case DW_MACRO_GNU_undef_indirect_alt:
20527 unsigned int bytes_read;
20532 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20533 mac_ptr += bytes_read;
20535 if (macinfo_type == DW_MACRO_GNU_define
20536 || macinfo_type == DW_MACRO_GNU_undef)
20538 body = read_direct_string (abfd, mac_ptr, &bytes_read);
20539 mac_ptr += bytes_read;
20543 LONGEST str_offset;
20545 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
20546 mac_ptr += offset_size;
20548 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
20549 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
20552 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20554 body = read_indirect_string_from_dwz (dwz, str_offset);
20557 body = read_indirect_string_at_offset (abfd, str_offset);
20560 is_define = (macinfo_type == DW_MACRO_GNU_define
20561 || macinfo_type == DW_MACRO_GNU_define_indirect
20562 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
20563 if (! current_file)
20565 /* DWARF violation as no main source is present. */
20566 complaint (&symfile_complaints,
20567 _("debug info with no main source gives macro %s "
20569 is_define ? _("definition") : _("undefinition"),
20573 if ((line == 0 && !at_commandline)
20574 || (line != 0 && at_commandline))
20575 complaint (&symfile_complaints,
20576 _("debug info gives %s macro %s with %s line %d: %s"),
20577 at_commandline ? _("command-line") : _("in-file"),
20578 is_define ? _("definition") : _("undefinition"),
20579 line == 0 ? _("zero") : _("non-zero"), line, body);
20582 parse_macro_definition (current_file, line, body);
20585 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
20586 || macinfo_type == DW_MACRO_GNU_undef_indirect
20587 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
20588 macro_undef (current_file, line, body);
20593 case DW_MACRO_GNU_start_file:
20595 unsigned int bytes_read;
20598 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20599 mac_ptr += bytes_read;
20600 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20601 mac_ptr += bytes_read;
20603 if ((line == 0 && !at_commandline)
20604 || (line != 0 && at_commandline))
20605 complaint (&symfile_complaints,
20606 _("debug info gives source %d included "
20607 "from %s at %s line %d"),
20608 file, at_commandline ? _("command-line") : _("file"),
20609 line == 0 ? _("zero") : _("non-zero"), line);
20611 if (at_commandline)
20613 /* This DW_MACRO_GNU_start_file was executed in the
20615 at_commandline = 0;
20618 current_file = macro_start_file (file, line,
20619 current_file, comp_dir,
20624 case DW_MACRO_GNU_end_file:
20625 if (! current_file)
20626 complaint (&symfile_complaints,
20627 _("macro debug info has an unmatched "
20628 "`close_file' directive"));
20631 current_file = current_file->included_by;
20632 if (! current_file)
20634 enum dwarf_macro_record_type next_type;
20636 /* GCC circa March 2002 doesn't produce the zero
20637 type byte marking the end of the compilation
20638 unit. Complain if it's not there, but exit no
20641 /* Do we at least have room for a macinfo type byte? */
20642 if (mac_ptr >= mac_end)
20644 dwarf2_section_buffer_overflow_complaint (section);
20648 /* We don't increment mac_ptr here, so this is just
20650 next_type = read_1_byte (abfd, mac_ptr);
20651 if (next_type != 0)
20652 complaint (&symfile_complaints,
20653 _("no terminating 0-type entry for "
20654 "macros in `.debug_macinfo' section"));
20661 case DW_MACRO_GNU_transparent_include:
20662 case DW_MACRO_GNU_transparent_include_alt:
20666 bfd *include_bfd = abfd;
20667 struct dwarf2_section_info *include_section = section;
20668 struct dwarf2_section_info alt_section;
20669 const gdb_byte *include_mac_end = mac_end;
20670 int is_dwz = section_is_dwz;
20671 const gdb_byte *new_mac_ptr;
20673 offset = read_offset_1 (abfd, mac_ptr, offset_size);
20674 mac_ptr += offset_size;
20676 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
20678 struct dwz_file *dwz = dwarf2_get_dwz_file ();
20680 dwarf2_read_section (dwarf2_per_objfile->objfile,
20683 include_section = &dwz->macro;
20684 include_bfd = get_section_bfd_owner (include_section);
20685 include_mac_end = dwz->macro.buffer + dwz->macro.size;
20689 new_mac_ptr = include_section->buffer + offset;
20690 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
20694 /* This has actually happened; see
20695 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
20696 complaint (&symfile_complaints,
20697 _("recursive DW_MACRO_GNU_transparent_include in "
20698 ".debug_macro section"));
20702 *slot = (void *) new_mac_ptr;
20704 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
20705 include_mac_end, current_file,
20707 section, section_is_gnu, is_dwz,
20708 offset_size, objfile, include_hash);
20710 htab_remove_elt (include_hash, (void *) new_mac_ptr);
20715 case DW_MACINFO_vendor_ext:
20716 if (!section_is_gnu)
20718 unsigned int bytes_read;
20721 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20722 mac_ptr += bytes_read;
20723 read_direct_string (abfd, mac_ptr, &bytes_read);
20724 mac_ptr += bytes_read;
20726 /* We don't recognize any vendor extensions. */
20732 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20733 mac_ptr, mac_end, abfd, offset_size,
20735 if (mac_ptr == NULL)
20739 } while (macinfo_type != 0);
20743 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
20744 const char *comp_dir, int section_is_gnu)
20746 struct objfile *objfile = dwarf2_per_objfile->objfile;
20747 struct line_header *lh = cu->line_header;
20749 const gdb_byte *mac_ptr, *mac_end;
20750 struct macro_source_file *current_file = 0;
20751 enum dwarf_macro_record_type macinfo_type;
20752 unsigned int offset_size = cu->header.offset_size;
20753 const gdb_byte *opcode_definitions[256];
20754 struct cleanup *cleanup;
20755 htab_t include_hash;
20757 struct dwarf2_section_info *section;
20758 const char *section_name;
20760 if (cu->dwo_unit != NULL)
20762 if (section_is_gnu)
20764 section = &cu->dwo_unit->dwo_file->sections.macro;
20765 section_name = ".debug_macro.dwo";
20769 section = &cu->dwo_unit->dwo_file->sections.macinfo;
20770 section_name = ".debug_macinfo.dwo";
20775 if (section_is_gnu)
20777 section = &dwarf2_per_objfile->macro;
20778 section_name = ".debug_macro";
20782 section = &dwarf2_per_objfile->macinfo;
20783 section_name = ".debug_macinfo";
20787 dwarf2_read_section (objfile, section);
20788 if (section->buffer == NULL)
20790 complaint (&symfile_complaints, _("missing %s section"), section_name);
20793 abfd = get_section_bfd_owner (section);
20795 /* First pass: Find the name of the base filename.
20796 This filename is needed in order to process all macros whose definition
20797 (or undefinition) comes from the command line. These macros are defined
20798 before the first DW_MACINFO_start_file entry, and yet still need to be
20799 associated to the base file.
20801 To determine the base file name, we scan the macro definitions until we
20802 reach the first DW_MACINFO_start_file entry. We then initialize
20803 CURRENT_FILE accordingly so that any macro definition found before the
20804 first DW_MACINFO_start_file can still be associated to the base file. */
20806 mac_ptr = section->buffer + offset;
20807 mac_end = section->buffer + section->size;
20809 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
20810 &offset_size, section_is_gnu);
20811 if (mac_ptr == NULL)
20813 /* We already issued a complaint. */
20819 /* Do we at least have room for a macinfo type byte? */
20820 if (mac_ptr >= mac_end)
20822 /* Complaint is printed during the second pass as GDB will probably
20823 stop the first pass earlier upon finding
20824 DW_MACINFO_start_file. */
20828 macinfo_type = read_1_byte (abfd, mac_ptr);
20831 /* Note that we rely on the fact that the corresponding GNU and
20832 DWARF constants are the same. */
20833 switch (macinfo_type)
20835 /* A zero macinfo type indicates the end of the macro
20840 case DW_MACRO_GNU_define:
20841 case DW_MACRO_GNU_undef:
20842 /* Only skip the data by MAC_PTR. */
20844 unsigned int bytes_read;
20846 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20847 mac_ptr += bytes_read;
20848 read_direct_string (abfd, mac_ptr, &bytes_read);
20849 mac_ptr += bytes_read;
20853 case DW_MACRO_GNU_start_file:
20855 unsigned int bytes_read;
20858 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20859 mac_ptr += bytes_read;
20860 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20861 mac_ptr += bytes_read;
20863 current_file = macro_start_file (file, line, current_file,
20864 comp_dir, lh, objfile);
20868 case DW_MACRO_GNU_end_file:
20869 /* No data to skip by MAC_PTR. */
20872 case DW_MACRO_GNU_define_indirect:
20873 case DW_MACRO_GNU_undef_indirect:
20874 case DW_MACRO_GNU_define_indirect_alt:
20875 case DW_MACRO_GNU_undef_indirect_alt:
20877 unsigned int bytes_read;
20879 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20880 mac_ptr += bytes_read;
20881 mac_ptr += offset_size;
20885 case DW_MACRO_GNU_transparent_include:
20886 case DW_MACRO_GNU_transparent_include_alt:
20887 /* Note that, according to the spec, a transparent include
20888 chain cannot call DW_MACRO_GNU_start_file. So, we can just
20889 skip this opcode. */
20890 mac_ptr += offset_size;
20893 case DW_MACINFO_vendor_ext:
20894 /* Only skip the data by MAC_PTR. */
20895 if (!section_is_gnu)
20897 unsigned int bytes_read;
20899 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
20900 mac_ptr += bytes_read;
20901 read_direct_string (abfd, mac_ptr, &bytes_read);
20902 mac_ptr += bytes_read;
20907 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
20908 mac_ptr, mac_end, abfd, offset_size,
20910 if (mac_ptr == NULL)
20914 } while (macinfo_type != 0 && current_file == NULL);
20916 /* Second pass: Process all entries.
20918 Use the AT_COMMAND_LINE flag to determine whether we are still processing
20919 command-line macro definitions/undefinitions. This flag is unset when we
20920 reach the first DW_MACINFO_start_file entry. */
20922 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
20923 NULL, xcalloc, xfree);
20924 cleanup = make_cleanup_htab_delete (include_hash);
20925 mac_ptr = section->buffer + offset;
20926 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
20927 *slot = (void *) mac_ptr;
20928 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
20929 current_file, lh, comp_dir, section,
20931 offset_size, objfile, include_hash);
20932 do_cleanups (cleanup);
20935 /* Check if the attribute's form is a DW_FORM_block*
20936 if so return true else false. */
20939 attr_form_is_block (const struct attribute *attr)
20941 return (attr == NULL ? 0 :
20942 attr->form == DW_FORM_block1
20943 || attr->form == DW_FORM_block2
20944 || attr->form == DW_FORM_block4
20945 || attr->form == DW_FORM_block
20946 || attr->form == DW_FORM_exprloc);
20949 /* Return non-zero if ATTR's value is a section offset --- classes
20950 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
20951 You may use DW_UNSND (attr) to retrieve such offsets.
20953 Section 7.5.4, "Attribute Encodings", explains that no attribute
20954 may have a value that belongs to more than one of these classes; it
20955 would be ambiguous if we did, because we use the same forms for all
20959 attr_form_is_section_offset (const struct attribute *attr)
20961 return (attr->form == DW_FORM_data4
20962 || attr->form == DW_FORM_data8
20963 || attr->form == DW_FORM_sec_offset);
20966 /* Return non-zero if ATTR's value falls in the 'constant' class, or
20967 zero otherwise. When this function returns true, you can apply
20968 dwarf2_get_attr_constant_value to it.
20970 However, note that for some attributes you must check
20971 attr_form_is_section_offset before using this test. DW_FORM_data4
20972 and DW_FORM_data8 are members of both the constant class, and of
20973 the classes that contain offsets into other debug sections
20974 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
20975 that, if an attribute's can be either a constant or one of the
20976 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
20977 taken as section offsets, not constants. */
20980 attr_form_is_constant (const struct attribute *attr)
20982 switch (attr->form)
20984 case DW_FORM_sdata:
20985 case DW_FORM_udata:
20986 case DW_FORM_data1:
20987 case DW_FORM_data2:
20988 case DW_FORM_data4:
20989 case DW_FORM_data8:
20997 /* DW_ADDR is always stored already as sect_offset; despite for the forms
20998 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
21001 attr_form_is_ref (const struct attribute *attr)
21003 switch (attr->form)
21005 case DW_FORM_ref_addr:
21010 case DW_FORM_ref_udata:
21011 case DW_FORM_GNU_ref_alt:
21018 /* Return the .debug_loc section to use for CU.
21019 For DWO files use .debug_loc.dwo. */
21021 static struct dwarf2_section_info *
21022 cu_debug_loc_section (struct dwarf2_cu *cu)
21025 return &cu->dwo_unit->dwo_file->sections.loc;
21026 return &dwarf2_per_objfile->loc;
21029 /* A helper function that fills in a dwarf2_loclist_baton. */
21032 fill_in_loclist_baton (struct dwarf2_cu *cu,
21033 struct dwarf2_loclist_baton *baton,
21034 const struct attribute *attr)
21036 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21038 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
21040 baton->per_cu = cu->per_cu;
21041 gdb_assert (baton->per_cu);
21042 /* We don't know how long the location list is, but make sure we
21043 don't run off the edge of the section. */
21044 baton->size = section->size - DW_UNSND (attr);
21045 baton->data = section->buffer + DW_UNSND (attr);
21046 baton->base_address = cu->base_address;
21047 baton->from_dwo = cu->dwo_unit != NULL;
21051 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
21052 struct dwarf2_cu *cu, int is_block)
21054 struct objfile *objfile = dwarf2_per_objfile->objfile;
21055 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21057 if (attr_form_is_section_offset (attr)
21058 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
21059 the section. If so, fall through to the complaint in the
21061 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
21063 struct dwarf2_loclist_baton *baton;
21065 baton = obstack_alloc (&objfile->objfile_obstack,
21066 sizeof (struct dwarf2_loclist_baton));
21068 fill_in_loclist_baton (cu, baton, attr);
21070 if (cu->base_known == 0)
21071 complaint (&symfile_complaints,
21072 _("Location list used without "
21073 "specifying the CU base address."));
21075 SYMBOL_ACLASS_INDEX (sym) = (is_block
21076 ? dwarf2_loclist_block_index
21077 : dwarf2_loclist_index);
21078 SYMBOL_LOCATION_BATON (sym) = baton;
21082 struct dwarf2_locexpr_baton *baton;
21084 baton = obstack_alloc (&objfile->objfile_obstack,
21085 sizeof (struct dwarf2_locexpr_baton));
21086 baton->per_cu = cu->per_cu;
21087 gdb_assert (baton->per_cu);
21089 if (attr_form_is_block (attr))
21091 /* Note that we're just copying the block's data pointer
21092 here, not the actual data. We're still pointing into the
21093 info_buffer for SYM's objfile; right now we never release
21094 that buffer, but when we do clean up properly this may
21096 baton->size = DW_BLOCK (attr)->size;
21097 baton->data = DW_BLOCK (attr)->data;
21101 dwarf2_invalid_attrib_class_complaint ("location description",
21102 SYMBOL_NATURAL_NAME (sym));
21106 SYMBOL_ACLASS_INDEX (sym) = (is_block
21107 ? dwarf2_locexpr_block_index
21108 : dwarf2_locexpr_index);
21109 SYMBOL_LOCATION_BATON (sym) = baton;
21113 /* Return the OBJFILE associated with the compilation unit CU. If CU
21114 came from a separate debuginfo file, then the master objfile is
21118 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
21120 struct objfile *objfile = per_cu->objfile;
21122 /* Return the master objfile, so that we can report and look up the
21123 correct file containing this variable. */
21124 if (objfile->separate_debug_objfile_backlink)
21125 objfile = objfile->separate_debug_objfile_backlink;
21130 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
21131 (CU_HEADERP is unused in such case) or prepare a temporary copy at
21132 CU_HEADERP first. */
21134 static const struct comp_unit_head *
21135 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
21136 struct dwarf2_per_cu_data *per_cu)
21138 const gdb_byte *info_ptr;
21141 return &per_cu->cu->header;
21143 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
21145 memset (cu_headerp, 0, sizeof (*cu_headerp));
21146 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
21151 /* Return the address size given in the compilation unit header for CU. */
21154 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
21156 struct comp_unit_head cu_header_local;
21157 const struct comp_unit_head *cu_headerp;
21159 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21161 return cu_headerp->addr_size;
21164 /* Return the offset size given in the compilation unit header for CU. */
21167 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
21169 struct comp_unit_head cu_header_local;
21170 const struct comp_unit_head *cu_headerp;
21172 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21174 return cu_headerp->offset_size;
21177 /* See its dwarf2loc.h declaration. */
21180 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
21182 struct comp_unit_head cu_header_local;
21183 const struct comp_unit_head *cu_headerp;
21185 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21187 if (cu_headerp->version == 2)
21188 return cu_headerp->addr_size;
21190 return cu_headerp->offset_size;
21193 /* Return the text offset of the CU. The returned offset comes from
21194 this CU's objfile. If this objfile came from a separate debuginfo
21195 file, then the offset may be different from the corresponding
21196 offset in the parent objfile. */
21199 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
21201 struct objfile *objfile = per_cu->objfile;
21203 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21206 /* Locate the .debug_info compilation unit from CU's objfile which contains
21207 the DIE at OFFSET. Raises an error on failure. */
21209 static struct dwarf2_per_cu_data *
21210 dwarf2_find_containing_comp_unit (sect_offset offset,
21211 unsigned int offset_in_dwz,
21212 struct objfile *objfile)
21214 struct dwarf2_per_cu_data *this_cu;
21216 const sect_offset *cu_off;
21219 high = dwarf2_per_objfile->n_comp_units - 1;
21222 struct dwarf2_per_cu_data *mid_cu;
21223 int mid = low + (high - low) / 2;
21225 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
21226 cu_off = &mid_cu->offset;
21227 if (mid_cu->is_dwz > offset_in_dwz
21228 || (mid_cu->is_dwz == offset_in_dwz
21229 && cu_off->sect_off >= offset.sect_off))
21234 gdb_assert (low == high);
21235 this_cu = dwarf2_per_objfile->all_comp_units[low];
21236 cu_off = &this_cu->offset;
21237 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
21239 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
21240 error (_("Dwarf Error: could not find partial DIE containing "
21241 "offset 0x%lx [in module %s]"),
21242 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
21244 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
21245 <= offset.sect_off);
21246 return dwarf2_per_objfile->all_comp_units[low-1];
21250 this_cu = dwarf2_per_objfile->all_comp_units[low];
21251 if (low == dwarf2_per_objfile->n_comp_units - 1
21252 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
21253 error (_("invalid dwarf2 offset %u"), offset.sect_off);
21254 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
21259 /* Initialize dwarf2_cu CU, owned by PER_CU. */
21262 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
21264 memset (cu, 0, sizeof (*cu));
21266 cu->per_cu = per_cu;
21267 cu->objfile = per_cu->objfile;
21268 obstack_init (&cu->comp_unit_obstack);
21271 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
21274 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
21275 enum language pretend_language)
21277 struct attribute *attr;
21279 /* Set the language we're debugging. */
21280 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
21282 set_cu_language (DW_UNSND (attr), cu);
21285 cu->language = pretend_language;
21286 cu->language_defn = language_def (cu->language);
21289 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
21291 cu->producer = DW_STRING (attr);
21294 /* Release one cached compilation unit, CU. We unlink it from the tree
21295 of compilation units, but we don't remove it from the read_in_chain;
21296 the caller is responsible for that.
21297 NOTE: DATA is a void * because this function is also used as a
21298 cleanup routine. */
21301 free_heap_comp_unit (void *data)
21303 struct dwarf2_cu *cu = data;
21305 gdb_assert (cu->per_cu != NULL);
21306 cu->per_cu->cu = NULL;
21309 obstack_free (&cu->comp_unit_obstack, NULL);
21314 /* This cleanup function is passed the address of a dwarf2_cu on the stack
21315 when we're finished with it. We can't free the pointer itself, but be
21316 sure to unlink it from the cache. Also release any associated storage. */
21319 free_stack_comp_unit (void *data)
21321 struct dwarf2_cu *cu = data;
21323 gdb_assert (cu->per_cu != NULL);
21324 cu->per_cu->cu = NULL;
21327 obstack_free (&cu->comp_unit_obstack, NULL);
21328 cu->partial_dies = NULL;
21331 /* Free all cached compilation units. */
21334 free_cached_comp_units (void *data)
21336 struct dwarf2_per_cu_data *per_cu, **last_chain;
21338 per_cu = dwarf2_per_objfile->read_in_chain;
21339 last_chain = &dwarf2_per_objfile->read_in_chain;
21340 while (per_cu != NULL)
21342 struct dwarf2_per_cu_data *next_cu;
21344 next_cu = per_cu->cu->read_in_chain;
21346 free_heap_comp_unit (per_cu->cu);
21347 *last_chain = next_cu;
21353 /* Increase the age counter on each cached compilation unit, and free
21354 any that are too old. */
21357 age_cached_comp_units (void)
21359 struct dwarf2_per_cu_data *per_cu, **last_chain;
21361 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
21362 per_cu = dwarf2_per_objfile->read_in_chain;
21363 while (per_cu != NULL)
21365 per_cu->cu->last_used ++;
21366 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
21367 dwarf2_mark (per_cu->cu);
21368 per_cu = per_cu->cu->read_in_chain;
21371 per_cu = dwarf2_per_objfile->read_in_chain;
21372 last_chain = &dwarf2_per_objfile->read_in_chain;
21373 while (per_cu != NULL)
21375 struct dwarf2_per_cu_data *next_cu;
21377 next_cu = per_cu->cu->read_in_chain;
21379 if (!per_cu->cu->mark)
21381 free_heap_comp_unit (per_cu->cu);
21382 *last_chain = next_cu;
21385 last_chain = &per_cu->cu->read_in_chain;
21391 /* Remove a single compilation unit from the cache. */
21394 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
21396 struct dwarf2_per_cu_data *per_cu, **last_chain;
21398 per_cu = dwarf2_per_objfile->read_in_chain;
21399 last_chain = &dwarf2_per_objfile->read_in_chain;
21400 while (per_cu != NULL)
21402 struct dwarf2_per_cu_data *next_cu;
21404 next_cu = per_cu->cu->read_in_chain;
21406 if (per_cu == target_per_cu)
21408 free_heap_comp_unit (per_cu->cu);
21410 *last_chain = next_cu;
21414 last_chain = &per_cu->cu->read_in_chain;
21420 /* Release all extra memory associated with OBJFILE. */
21423 dwarf2_free_objfile (struct objfile *objfile)
21425 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21427 if (dwarf2_per_objfile == NULL)
21430 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
21431 free_cached_comp_units (NULL);
21433 if (dwarf2_per_objfile->quick_file_names_table)
21434 htab_delete (dwarf2_per_objfile->quick_file_names_table);
21436 /* Everything else should be on the objfile obstack. */
21439 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
21440 We store these in a hash table separate from the DIEs, and preserve them
21441 when the DIEs are flushed out of cache.
21443 The CU "per_cu" pointer is needed because offset alone is not enough to
21444 uniquely identify the type. A file may have multiple .debug_types sections,
21445 or the type may come from a DWO file. Furthermore, while it's more logical
21446 to use per_cu->section+offset, with Fission the section with the data is in
21447 the DWO file but we don't know that section at the point we need it.
21448 We have to use something in dwarf2_per_cu_data (or the pointer to it)
21449 because we can enter the lookup routine, get_die_type_at_offset, from
21450 outside this file, and thus won't necessarily have PER_CU->cu.
21451 Fortunately, PER_CU is stable for the life of the objfile. */
21453 struct dwarf2_per_cu_offset_and_type
21455 const struct dwarf2_per_cu_data *per_cu;
21456 sect_offset offset;
21460 /* Hash function for a dwarf2_per_cu_offset_and_type. */
21463 per_cu_offset_and_type_hash (const void *item)
21465 const struct dwarf2_per_cu_offset_and_type *ofs = item;
21467 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
21470 /* Equality function for a dwarf2_per_cu_offset_and_type. */
21473 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
21475 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
21476 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
21478 return (ofs_lhs->per_cu == ofs_rhs->per_cu
21479 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
21482 /* Set the type associated with DIE to TYPE. Save it in CU's hash
21483 table if necessary. For convenience, return TYPE.
21485 The DIEs reading must have careful ordering to:
21486 * Not cause infite loops trying to read in DIEs as a prerequisite for
21487 reading current DIE.
21488 * Not trying to dereference contents of still incompletely read in types
21489 while reading in other DIEs.
21490 * Enable referencing still incompletely read in types just by a pointer to
21491 the type without accessing its fields.
21493 Therefore caller should follow these rules:
21494 * Try to fetch any prerequisite types we may need to build this DIE type
21495 before building the type and calling set_die_type.
21496 * After building type call set_die_type for current DIE as soon as
21497 possible before fetching more types to complete the current type.
21498 * Make the type as complete as possible before fetching more types. */
21500 static struct type *
21501 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
21503 struct dwarf2_per_cu_offset_and_type **slot, ofs;
21504 struct objfile *objfile = cu->objfile;
21506 /* For Ada types, make sure that the gnat-specific data is always
21507 initialized (if not already set). There are a few types where
21508 we should not be doing so, because the type-specific area is
21509 already used to hold some other piece of info (eg: TYPE_CODE_FLT
21510 where the type-specific area is used to store the floatformat).
21511 But this is not a problem, because the gnat-specific information
21512 is actually not needed for these types. */
21513 if (need_gnat_info (cu)
21514 && TYPE_CODE (type) != TYPE_CODE_FUNC
21515 && TYPE_CODE (type) != TYPE_CODE_FLT
21516 && !HAVE_GNAT_AUX_INFO (type))
21517 INIT_GNAT_SPECIFIC (type);
21519 if (dwarf2_per_objfile->die_type_hash == NULL)
21521 dwarf2_per_objfile->die_type_hash =
21522 htab_create_alloc_ex (127,
21523 per_cu_offset_and_type_hash,
21524 per_cu_offset_and_type_eq,
21526 &objfile->objfile_obstack,
21527 hashtab_obstack_allocate,
21528 dummy_obstack_deallocate);
21531 ofs.per_cu = cu->per_cu;
21532 ofs.offset = die->offset;
21534 slot = (struct dwarf2_per_cu_offset_and_type **)
21535 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
21537 complaint (&symfile_complaints,
21538 _("A problem internal to GDB: DIE 0x%x has type already set"),
21539 die->offset.sect_off);
21540 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
21545 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
21546 or return NULL if the die does not have a saved type. */
21548 static struct type *
21549 get_die_type_at_offset (sect_offset offset,
21550 struct dwarf2_per_cu_data *per_cu)
21552 struct dwarf2_per_cu_offset_and_type *slot, ofs;
21554 if (dwarf2_per_objfile->die_type_hash == NULL)
21557 ofs.per_cu = per_cu;
21558 ofs.offset = offset;
21559 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
21566 /* Look up the type for DIE in CU in die_type_hash,
21567 or return NULL if DIE does not have a saved type. */
21569 static struct type *
21570 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
21572 return get_die_type_at_offset (die->offset, cu->per_cu);
21575 /* Add a dependence relationship from CU to REF_PER_CU. */
21578 dwarf2_add_dependence (struct dwarf2_cu *cu,
21579 struct dwarf2_per_cu_data *ref_per_cu)
21583 if (cu->dependencies == NULL)
21585 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
21586 NULL, &cu->comp_unit_obstack,
21587 hashtab_obstack_allocate,
21588 dummy_obstack_deallocate);
21590 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
21592 *slot = ref_per_cu;
21595 /* Subroutine of dwarf2_mark to pass to htab_traverse.
21596 Set the mark field in every compilation unit in the
21597 cache that we must keep because we are keeping CU. */
21600 dwarf2_mark_helper (void **slot, void *data)
21602 struct dwarf2_per_cu_data *per_cu;
21604 per_cu = (struct dwarf2_per_cu_data *) *slot;
21606 /* cu->dependencies references may not yet have been ever read if QUIT aborts
21607 reading of the chain. As such dependencies remain valid it is not much
21608 useful to track and undo them during QUIT cleanups. */
21609 if (per_cu->cu == NULL)
21612 if (per_cu->cu->mark)
21614 per_cu->cu->mark = 1;
21616 if (per_cu->cu->dependencies != NULL)
21617 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
21622 /* Set the mark field in CU and in every other compilation unit in the
21623 cache that we must keep because we are keeping CU. */
21626 dwarf2_mark (struct dwarf2_cu *cu)
21631 if (cu->dependencies != NULL)
21632 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
21636 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
21640 per_cu->cu->mark = 0;
21641 per_cu = per_cu->cu->read_in_chain;
21645 /* Trivial hash function for partial_die_info: the hash value of a DIE
21646 is its offset in .debug_info for this objfile. */
21649 partial_die_hash (const void *item)
21651 const struct partial_die_info *part_die = item;
21653 return part_die->offset.sect_off;
21656 /* Trivial comparison function for partial_die_info structures: two DIEs
21657 are equal if they have the same offset. */
21660 partial_die_eq (const void *item_lhs, const void *item_rhs)
21662 const struct partial_die_info *part_die_lhs = item_lhs;
21663 const struct partial_die_info *part_die_rhs = item_rhs;
21665 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
21668 static struct cmd_list_element *set_dwarf2_cmdlist;
21669 static struct cmd_list_element *show_dwarf2_cmdlist;
21672 set_dwarf2_cmd (char *args, int from_tty)
21674 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
21678 show_dwarf2_cmd (char *args, int from_tty)
21680 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
21683 /* Free data associated with OBJFILE, if necessary. */
21686 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
21688 struct dwarf2_per_objfile *data = d;
21691 /* Make sure we don't accidentally use dwarf2_per_objfile while
21693 dwarf2_per_objfile = NULL;
21695 for (ix = 0; ix < data->n_comp_units; ++ix)
21696 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
21698 for (ix = 0; ix < data->n_type_units; ++ix)
21699 VEC_free (dwarf2_per_cu_ptr,
21700 data->all_type_units[ix]->per_cu.imported_symtabs);
21701 xfree (data->all_type_units);
21703 VEC_free (dwarf2_section_info_def, data->types);
21705 if (data->dwo_files)
21706 free_dwo_files (data->dwo_files, objfile);
21707 if (data->dwp_file)
21708 gdb_bfd_unref (data->dwp_file->dbfd);
21710 if (data->dwz_file && data->dwz_file->dwz_bfd)
21711 gdb_bfd_unref (data->dwz_file->dwz_bfd);
21715 /* The "save gdb-index" command. */
21717 /* The contents of the hash table we create when building the string
21719 struct strtab_entry
21721 offset_type offset;
21725 /* Hash function for a strtab_entry.
21727 Function is used only during write_hash_table so no index format backward
21728 compatibility is needed. */
21731 hash_strtab_entry (const void *e)
21733 const struct strtab_entry *entry = e;
21734 return mapped_index_string_hash (INT_MAX, entry->str);
21737 /* Equality function for a strtab_entry. */
21740 eq_strtab_entry (const void *a, const void *b)
21742 const struct strtab_entry *ea = a;
21743 const struct strtab_entry *eb = b;
21744 return !strcmp (ea->str, eb->str);
21747 /* Create a strtab_entry hash table. */
21750 create_strtab (void)
21752 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
21753 xfree, xcalloc, xfree);
21756 /* Add a string to the constant pool. Return the string's offset in
21760 add_string (htab_t table, struct obstack *cpool, const char *str)
21763 struct strtab_entry entry;
21764 struct strtab_entry *result;
21767 slot = htab_find_slot (table, &entry, INSERT);
21772 result = XNEW (struct strtab_entry);
21773 result->offset = obstack_object_size (cpool);
21775 obstack_grow_str0 (cpool, str);
21778 return result->offset;
21781 /* An entry in the symbol table. */
21782 struct symtab_index_entry
21784 /* The name of the symbol. */
21786 /* The offset of the name in the constant pool. */
21787 offset_type index_offset;
21788 /* A sorted vector of the indices of all the CUs that hold an object
21790 VEC (offset_type) *cu_indices;
21793 /* The symbol table. This is a power-of-2-sized hash table. */
21794 struct mapped_symtab
21796 offset_type n_elements;
21798 struct symtab_index_entry **data;
21801 /* Hash function for a symtab_index_entry. */
21804 hash_symtab_entry (const void *e)
21806 const struct symtab_index_entry *entry = e;
21807 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
21808 sizeof (offset_type) * VEC_length (offset_type,
21809 entry->cu_indices),
21813 /* Equality function for a symtab_index_entry. */
21816 eq_symtab_entry (const void *a, const void *b)
21818 const struct symtab_index_entry *ea = a;
21819 const struct symtab_index_entry *eb = b;
21820 int len = VEC_length (offset_type, ea->cu_indices);
21821 if (len != VEC_length (offset_type, eb->cu_indices))
21823 return !memcmp (VEC_address (offset_type, ea->cu_indices),
21824 VEC_address (offset_type, eb->cu_indices),
21825 sizeof (offset_type) * len);
21828 /* Destroy a symtab_index_entry. */
21831 delete_symtab_entry (void *p)
21833 struct symtab_index_entry *entry = p;
21834 VEC_free (offset_type, entry->cu_indices);
21838 /* Create a hash table holding symtab_index_entry objects. */
21841 create_symbol_hash_table (void)
21843 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
21844 delete_symtab_entry, xcalloc, xfree);
21847 /* Create a new mapped symtab object. */
21849 static struct mapped_symtab *
21850 create_mapped_symtab (void)
21852 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
21853 symtab->n_elements = 0;
21854 symtab->size = 1024;
21855 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21859 /* Destroy a mapped_symtab. */
21862 cleanup_mapped_symtab (void *p)
21864 struct mapped_symtab *symtab = p;
21865 /* The contents of the array are freed when the other hash table is
21867 xfree (symtab->data);
21871 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
21874 Function is used only during write_hash_table so no index format backward
21875 compatibility is needed. */
21877 static struct symtab_index_entry **
21878 find_slot (struct mapped_symtab *symtab, const char *name)
21880 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
21882 index = hash & (symtab->size - 1);
21883 step = ((hash * 17) & (symtab->size - 1)) | 1;
21887 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
21888 return &symtab->data[index];
21889 index = (index + step) & (symtab->size - 1);
21893 /* Expand SYMTAB's hash table. */
21896 hash_expand (struct mapped_symtab *symtab)
21898 offset_type old_size = symtab->size;
21900 struct symtab_index_entry **old_entries = symtab->data;
21903 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
21905 for (i = 0; i < old_size; ++i)
21907 if (old_entries[i])
21909 struct symtab_index_entry **slot = find_slot (symtab,
21910 old_entries[i]->name);
21911 *slot = old_entries[i];
21915 xfree (old_entries);
21918 /* Add an entry to SYMTAB. NAME is the name of the symbol.
21919 CU_INDEX is the index of the CU in which the symbol appears.
21920 IS_STATIC is one if the symbol is static, otherwise zero (global). */
21923 add_index_entry (struct mapped_symtab *symtab, const char *name,
21924 int is_static, gdb_index_symbol_kind kind,
21925 offset_type cu_index)
21927 struct symtab_index_entry **slot;
21928 offset_type cu_index_and_attrs;
21930 ++symtab->n_elements;
21931 if (4 * symtab->n_elements / 3 >= symtab->size)
21932 hash_expand (symtab);
21934 slot = find_slot (symtab, name);
21937 *slot = XNEW (struct symtab_index_entry);
21938 (*slot)->name = name;
21939 /* index_offset is set later. */
21940 (*slot)->cu_indices = NULL;
21943 cu_index_and_attrs = 0;
21944 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
21945 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
21946 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
21948 /* We don't want to record an index value twice as we want to avoid the
21950 We process all global symbols and then all static symbols
21951 (which would allow us to avoid the duplication by only having to check
21952 the last entry pushed), but a symbol could have multiple kinds in one CU.
21953 To keep things simple we don't worry about the duplication here and
21954 sort and uniqufy the list after we've processed all symbols. */
21955 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
21958 /* qsort helper routine for uniquify_cu_indices. */
21961 offset_type_compare (const void *ap, const void *bp)
21963 offset_type a = *(offset_type *) ap;
21964 offset_type b = *(offset_type *) bp;
21966 return (a > b) - (b > a);
21969 /* Sort and remove duplicates of all symbols' cu_indices lists. */
21972 uniquify_cu_indices (struct mapped_symtab *symtab)
21976 for (i = 0; i < symtab->size; ++i)
21978 struct symtab_index_entry *entry = symtab->data[i];
21981 && entry->cu_indices != NULL)
21983 unsigned int next_to_insert, next_to_check;
21984 offset_type last_value;
21986 qsort (VEC_address (offset_type, entry->cu_indices),
21987 VEC_length (offset_type, entry->cu_indices),
21988 sizeof (offset_type), offset_type_compare);
21990 last_value = VEC_index (offset_type, entry->cu_indices, 0);
21991 next_to_insert = 1;
21992 for (next_to_check = 1;
21993 next_to_check < VEC_length (offset_type, entry->cu_indices);
21996 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
21999 last_value = VEC_index (offset_type, entry->cu_indices,
22001 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
22006 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
22011 /* Add a vector of indices to the constant pool. */
22014 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
22015 struct symtab_index_entry *entry)
22019 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
22022 offset_type len = VEC_length (offset_type, entry->cu_indices);
22023 offset_type val = MAYBE_SWAP (len);
22028 entry->index_offset = obstack_object_size (cpool);
22030 obstack_grow (cpool, &val, sizeof (val));
22032 VEC_iterate (offset_type, entry->cu_indices, i, iter);
22035 val = MAYBE_SWAP (iter);
22036 obstack_grow (cpool, &val, sizeof (val));
22041 struct symtab_index_entry *old_entry = *slot;
22042 entry->index_offset = old_entry->index_offset;
22045 return entry->index_offset;
22048 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
22049 constant pool entries going into the obstack CPOOL. */
22052 write_hash_table (struct mapped_symtab *symtab,
22053 struct obstack *output, struct obstack *cpool)
22056 htab_t symbol_hash_table;
22059 symbol_hash_table = create_symbol_hash_table ();
22060 str_table = create_strtab ();
22062 /* We add all the index vectors to the constant pool first, to
22063 ensure alignment is ok. */
22064 for (i = 0; i < symtab->size; ++i)
22066 if (symtab->data[i])
22067 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
22070 /* Now write out the hash table. */
22071 for (i = 0; i < symtab->size; ++i)
22073 offset_type str_off, vec_off;
22075 if (symtab->data[i])
22077 str_off = add_string (str_table, cpool, symtab->data[i]->name);
22078 vec_off = symtab->data[i]->index_offset;
22082 /* While 0 is a valid constant pool index, it is not valid
22083 to have 0 for both offsets. */
22088 str_off = MAYBE_SWAP (str_off);
22089 vec_off = MAYBE_SWAP (vec_off);
22091 obstack_grow (output, &str_off, sizeof (str_off));
22092 obstack_grow (output, &vec_off, sizeof (vec_off));
22095 htab_delete (str_table);
22096 htab_delete (symbol_hash_table);
22099 /* Struct to map psymtab to CU index in the index file. */
22100 struct psymtab_cu_index_map
22102 struct partial_symtab *psymtab;
22103 unsigned int cu_index;
22107 hash_psymtab_cu_index (const void *item)
22109 const struct psymtab_cu_index_map *map = item;
22111 return htab_hash_pointer (map->psymtab);
22115 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
22117 const struct psymtab_cu_index_map *lhs = item_lhs;
22118 const struct psymtab_cu_index_map *rhs = item_rhs;
22120 return lhs->psymtab == rhs->psymtab;
22123 /* Helper struct for building the address table. */
22124 struct addrmap_index_data
22126 struct objfile *objfile;
22127 struct obstack *addr_obstack;
22128 htab_t cu_index_htab;
22130 /* Non-zero if the previous_* fields are valid.
22131 We can't write an entry until we see the next entry (since it is only then
22132 that we know the end of the entry). */
22133 int previous_valid;
22134 /* Index of the CU in the table of all CUs in the index file. */
22135 unsigned int previous_cu_index;
22136 /* Start address of the CU. */
22137 CORE_ADDR previous_cu_start;
22140 /* Write an address entry to OBSTACK. */
22143 add_address_entry (struct objfile *objfile, struct obstack *obstack,
22144 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
22146 offset_type cu_index_to_write;
22148 CORE_ADDR baseaddr;
22150 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22152 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
22153 obstack_grow (obstack, addr, 8);
22154 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
22155 obstack_grow (obstack, addr, 8);
22156 cu_index_to_write = MAYBE_SWAP (cu_index);
22157 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
22160 /* Worker function for traversing an addrmap to build the address table. */
22163 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
22165 struct addrmap_index_data *data = datap;
22166 struct partial_symtab *pst = obj;
22168 if (data->previous_valid)
22169 add_address_entry (data->objfile, data->addr_obstack,
22170 data->previous_cu_start, start_addr,
22171 data->previous_cu_index);
22173 data->previous_cu_start = start_addr;
22176 struct psymtab_cu_index_map find_map, *map;
22177 find_map.psymtab = pst;
22178 map = htab_find (data->cu_index_htab, &find_map);
22179 gdb_assert (map != NULL);
22180 data->previous_cu_index = map->cu_index;
22181 data->previous_valid = 1;
22184 data->previous_valid = 0;
22189 /* Write OBJFILE's address map to OBSTACK.
22190 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
22191 in the index file. */
22194 write_address_map (struct objfile *objfile, struct obstack *obstack,
22195 htab_t cu_index_htab)
22197 struct addrmap_index_data addrmap_index_data;
22199 /* When writing the address table, we have to cope with the fact that
22200 the addrmap iterator only provides the start of a region; we have to
22201 wait until the next invocation to get the start of the next region. */
22203 addrmap_index_data.objfile = objfile;
22204 addrmap_index_data.addr_obstack = obstack;
22205 addrmap_index_data.cu_index_htab = cu_index_htab;
22206 addrmap_index_data.previous_valid = 0;
22208 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
22209 &addrmap_index_data);
22211 /* It's highly unlikely the last entry (end address = 0xff...ff)
22212 is valid, but we should still handle it.
22213 The end address is recorded as the start of the next region, but that
22214 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
22216 if (addrmap_index_data.previous_valid)
22217 add_address_entry (objfile, obstack,
22218 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
22219 addrmap_index_data.previous_cu_index);
22222 /* Return the symbol kind of PSYM. */
22224 static gdb_index_symbol_kind
22225 symbol_kind (struct partial_symbol *psym)
22227 domain_enum domain = PSYMBOL_DOMAIN (psym);
22228 enum address_class aclass = PSYMBOL_CLASS (psym);
22236 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
22238 return GDB_INDEX_SYMBOL_KIND_TYPE;
22240 case LOC_CONST_BYTES:
22241 case LOC_OPTIMIZED_OUT:
22243 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22245 /* Note: It's currently impossible to recognize psyms as enum values
22246 short of reading the type info. For now punt. */
22247 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
22249 /* There are other LOC_FOO values that one might want to classify
22250 as variables, but dwarf2read.c doesn't currently use them. */
22251 return GDB_INDEX_SYMBOL_KIND_OTHER;
22253 case STRUCT_DOMAIN:
22254 return GDB_INDEX_SYMBOL_KIND_TYPE;
22256 return GDB_INDEX_SYMBOL_KIND_OTHER;
22260 /* Add a list of partial symbols to SYMTAB. */
22263 write_psymbols (struct mapped_symtab *symtab,
22265 struct partial_symbol **psymp,
22267 offset_type cu_index,
22270 for (; count-- > 0; ++psymp)
22272 struct partial_symbol *psym = *psymp;
22275 if (SYMBOL_LANGUAGE (psym) == language_ada)
22276 error (_("Ada is not currently supported by the index"));
22278 /* Only add a given psymbol once. */
22279 slot = htab_find_slot (psyms_seen, psym, INSERT);
22282 gdb_index_symbol_kind kind = symbol_kind (psym);
22285 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
22286 is_static, kind, cu_index);
22291 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
22292 exception if there is an error. */
22295 write_obstack (FILE *file, struct obstack *obstack)
22297 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
22299 != obstack_object_size (obstack))
22300 error (_("couldn't data write to file"));
22303 /* Unlink a file if the argument is not NULL. */
22306 unlink_if_set (void *p)
22308 char **filename = p;
22310 unlink (*filename);
22313 /* A helper struct used when iterating over debug_types. */
22314 struct signatured_type_index_data
22316 struct objfile *objfile;
22317 struct mapped_symtab *symtab;
22318 struct obstack *types_list;
22323 /* A helper function that writes a single signatured_type to an
22327 write_one_signatured_type (void **slot, void *d)
22329 struct signatured_type_index_data *info = d;
22330 struct signatured_type *entry = (struct signatured_type *) *slot;
22331 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
22334 write_psymbols (info->symtab,
22336 info->objfile->global_psymbols.list
22337 + psymtab->globals_offset,
22338 psymtab->n_global_syms, info->cu_index,
22340 write_psymbols (info->symtab,
22342 info->objfile->static_psymbols.list
22343 + psymtab->statics_offset,
22344 psymtab->n_static_syms, info->cu_index,
22347 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22348 entry->per_cu.offset.sect_off);
22349 obstack_grow (info->types_list, val, 8);
22350 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22351 entry->type_offset_in_tu.cu_off);
22352 obstack_grow (info->types_list, val, 8);
22353 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
22354 obstack_grow (info->types_list, val, 8);
22361 /* Recurse into all "included" dependencies and write their symbols as
22362 if they appeared in this psymtab. */
22365 recursively_write_psymbols (struct objfile *objfile,
22366 struct partial_symtab *psymtab,
22367 struct mapped_symtab *symtab,
22369 offset_type cu_index)
22373 for (i = 0; i < psymtab->number_of_dependencies; ++i)
22374 if (psymtab->dependencies[i]->user != NULL)
22375 recursively_write_psymbols (objfile, psymtab->dependencies[i],
22376 symtab, psyms_seen, cu_index);
22378 write_psymbols (symtab,
22380 objfile->global_psymbols.list + psymtab->globals_offset,
22381 psymtab->n_global_syms, cu_index,
22383 write_psymbols (symtab,
22385 objfile->static_psymbols.list + psymtab->statics_offset,
22386 psymtab->n_static_syms, cu_index,
22390 /* Create an index file for OBJFILE in the directory DIR. */
22393 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
22395 struct cleanup *cleanup;
22396 char *filename, *cleanup_filename;
22397 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
22398 struct obstack cu_list, types_cu_list;
22401 struct mapped_symtab *symtab;
22402 offset_type val, size_of_contents, total_len;
22405 htab_t cu_index_htab;
22406 struct psymtab_cu_index_map *psymtab_cu_index_map;
22408 if (dwarf2_per_objfile->using_index)
22409 error (_("Cannot use an index to create the index"));
22411 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
22412 error (_("Cannot make an index when the file has multiple .debug_types sections"));
22414 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
22417 if (stat (objfile_name (objfile), &st) < 0)
22418 perror_with_name (objfile_name (objfile));
22420 filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)),
22421 INDEX_SUFFIX, (char *) NULL);
22422 cleanup = make_cleanup (xfree, filename);
22424 out_file = gdb_fopen_cloexec (filename, "wb");
22426 error (_("Can't open `%s' for writing"), filename);
22428 cleanup_filename = filename;
22429 make_cleanup (unlink_if_set, &cleanup_filename);
22431 symtab = create_mapped_symtab ();
22432 make_cleanup (cleanup_mapped_symtab, symtab);
22434 obstack_init (&addr_obstack);
22435 make_cleanup_obstack_free (&addr_obstack);
22437 obstack_init (&cu_list);
22438 make_cleanup_obstack_free (&cu_list);
22440 obstack_init (&types_cu_list);
22441 make_cleanup_obstack_free (&types_cu_list);
22443 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
22444 NULL, xcalloc, xfree);
22445 make_cleanup_htab_delete (psyms_seen);
22447 /* While we're scanning CU's create a table that maps a psymtab pointer
22448 (which is what addrmap records) to its index (which is what is recorded
22449 in the index file). This will later be needed to write the address
22451 cu_index_htab = htab_create_alloc (100,
22452 hash_psymtab_cu_index,
22453 eq_psymtab_cu_index,
22454 NULL, xcalloc, xfree);
22455 make_cleanup_htab_delete (cu_index_htab);
22456 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
22457 xmalloc (sizeof (struct psymtab_cu_index_map)
22458 * dwarf2_per_objfile->n_comp_units);
22459 make_cleanup (xfree, psymtab_cu_index_map);
22461 /* The CU list is already sorted, so we don't need to do additional
22462 work here. Also, the debug_types entries do not appear in
22463 all_comp_units, but only in their own hash table. */
22464 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
22466 struct dwarf2_per_cu_data *per_cu
22467 = dwarf2_per_objfile->all_comp_units[i];
22468 struct partial_symtab *psymtab = per_cu->v.psymtab;
22470 struct psymtab_cu_index_map *map;
22473 /* CU of a shared file from 'dwz -m' may be unused by this main file.
22474 It may be referenced from a local scope but in such case it does not
22475 need to be present in .gdb_index. */
22476 if (psymtab == NULL)
22479 if (psymtab->user == NULL)
22480 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
22482 map = &psymtab_cu_index_map[i];
22483 map->psymtab = psymtab;
22485 slot = htab_find_slot (cu_index_htab, map, INSERT);
22486 gdb_assert (slot != NULL);
22487 gdb_assert (*slot == NULL);
22490 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
22491 per_cu->offset.sect_off);
22492 obstack_grow (&cu_list, val, 8);
22493 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
22494 obstack_grow (&cu_list, val, 8);
22497 /* Dump the address map. */
22498 write_address_map (objfile, &addr_obstack, cu_index_htab);
22500 /* Write out the .debug_type entries, if any. */
22501 if (dwarf2_per_objfile->signatured_types)
22503 struct signatured_type_index_data sig_data;
22505 sig_data.objfile = objfile;
22506 sig_data.symtab = symtab;
22507 sig_data.types_list = &types_cu_list;
22508 sig_data.psyms_seen = psyms_seen;
22509 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
22510 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
22511 write_one_signatured_type, &sig_data);
22514 /* Now that we've processed all symbols we can shrink their cu_indices
22516 uniquify_cu_indices (symtab);
22518 obstack_init (&constant_pool);
22519 make_cleanup_obstack_free (&constant_pool);
22520 obstack_init (&symtab_obstack);
22521 make_cleanup_obstack_free (&symtab_obstack);
22522 write_hash_table (symtab, &symtab_obstack, &constant_pool);
22524 obstack_init (&contents);
22525 make_cleanup_obstack_free (&contents);
22526 size_of_contents = 6 * sizeof (offset_type);
22527 total_len = size_of_contents;
22529 /* The version number. */
22530 val = MAYBE_SWAP (8);
22531 obstack_grow (&contents, &val, sizeof (val));
22533 /* The offset of the CU list from the start of the file. */
22534 val = MAYBE_SWAP (total_len);
22535 obstack_grow (&contents, &val, sizeof (val));
22536 total_len += obstack_object_size (&cu_list);
22538 /* The offset of the types CU list from the start of the file. */
22539 val = MAYBE_SWAP (total_len);
22540 obstack_grow (&contents, &val, sizeof (val));
22541 total_len += obstack_object_size (&types_cu_list);
22543 /* The offset of the address table from the start of the file. */
22544 val = MAYBE_SWAP (total_len);
22545 obstack_grow (&contents, &val, sizeof (val));
22546 total_len += obstack_object_size (&addr_obstack);
22548 /* The offset of the symbol table from the start of the file. */
22549 val = MAYBE_SWAP (total_len);
22550 obstack_grow (&contents, &val, sizeof (val));
22551 total_len += obstack_object_size (&symtab_obstack);
22553 /* The offset of the constant pool from the start of the file. */
22554 val = MAYBE_SWAP (total_len);
22555 obstack_grow (&contents, &val, sizeof (val));
22556 total_len += obstack_object_size (&constant_pool);
22558 gdb_assert (obstack_object_size (&contents) == size_of_contents);
22560 write_obstack (out_file, &contents);
22561 write_obstack (out_file, &cu_list);
22562 write_obstack (out_file, &types_cu_list);
22563 write_obstack (out_file, &addr_obstack);
22564 write_obstack (out_file, &symtab_obstack);
22565 write_obstack (out_file, &constant_pool);
22569 /* We want to keep the file, so we set cleanup_filename to NULL
22570 here. See unlink_if_set. */
22571 cleanup_filename = NULL;
22573 do_cleanups (cleanup);
22576 /* Implementation of the `save gdb-index' command.
22578 Note that the file format used by this command is documented in the
22579 GDB manual. Any changes here must be documented there. */
22582 save_gdb_index_command (char *arg, int from_tty)
22584 struct objfile *objfile;
22587 error (_("usage: save gdb-index DIRECTORY"));
22589 ALL_OBJFILES (objfile)
22593 /* If the objfile does not correspond to an actual file, skip it. */
22594 if (stat (objfile_name (objfile), &st) < 0)
22597 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
22598 if (dwarf2_per_objfile)
22600 volatile struct gdb_exception except;
22602 TRY_CATCH (except, RETURN_MASK_ERROR)
22604 write_psymtabs_to_index (objfile, arg);
22606 if (except.reason < 0)
22607 exception_fprintf (gdb_stderr, except,
22608 _("Error while writing index for `%s': "),
22609 objfile_name (objfile));
22616 int dwarf2_always_disassemble;
22619 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
22620 struct cmd_list_element *c, const char *value)
22622 fprintf_filtered (file,
22623 _("Whether to always disassemble "
22624 "DWARF expressions is %s.\n"),
22629 show_check_physname (struct ui_file *file, int from_tty,
22630 struct cmd_list_element *c, const char *value)
22632 fprintf_filtered (file,
22633 _("Whether to check \"physname\" is %s.\n"),
22637 void _initialize_dwarf2_read (void);
22640 _initialize_dwarf2_read (void)
22642 struct cmd_list_element *c;
22644 dwarf2_objfile_data_key
22645 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
22647 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
22648 Set DWARF 2 specific variables.\n\
22649 Configure DWARF 2 variables such as the cache size"),
22650 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
22651 0/*allow-unknown*/, &maintenance_set_cmdlist);
22653 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
22654 Show DWARF 2 specific variables\n\
22655 Show DWARF 2 variables such as the cache size"),
22656 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
22657 0/*allow-unknown*/, &maintenance_show_cmdlist);
22659 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
22660 &dwarf2_max_cache_age, _("\
22661 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
22662 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
22663 A higher limit means that cached compilation units will be stored\n\
22664 in memory longer, and more total memory will be used. Zero disables\n\
22665 caching, which can slow down startup."),
22667 show_dwarf2_max_cache_age,
22668 &set_dwarf2_cmdlist,
22669 &show_dwarf2_cmdlist);
22671 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
22672 &dwarf2_always_disassemble, _("\
22673 Set whether `info address' always disassembles DWARF expressions."), _("\
22674 Show whether `info address' always disassembles DWARF expressions."), _("\
22675 When enabled, DWARF expressions are always printed in an assembly-like\n\
22676 syntax. When disabled, expressions will be printed in a more\n\
22677 conversational style, when possible."),
22679 show_dwarf2_always_disassemble,
22680 &set_dwarf2_cmdlist,
22681 &show_dwarf2_cmdlist);
22683 add_setshow_zuinteger_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
22684 Set debugging of the dwarf2 reader."), _("\
22685 Show debugging of the dwarf2 reader."), _("\
22686 When enabled (non-zero), debugging messages are printed during dwarf2\n\
22687 reading and symtab expansion. A value of 1 (one) provides basic\n\
22688 information. A value greater than 1 provides more verbose information."),
22691 &setdebuglist, &showdebuglist);
22693 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
22694 Set debugging of the dwarf2 DIE reader."), _("\
22695 Show debugging of the dwarf2 DIE reader."), _("\
22696 When enabled (non-zero), DIEs are dumped after they are read in.\n\
22697 The value is the maximum depth to print."),
22700 &setdebuglist, &showdebuglist);
22702 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
22703 Set cross-checking of \"physname\" code against demangler."), _("\
22704 Show cross-checking of \"physname\" code against demangler."), _("\
22705 When enabled, GDB's internal \"physname\" code is checked against\n\
22707 NULL, show_check_physname,
22708 &setdebuglist, &showdebuglist);
22710 add_setshow_boolean_cmd ("use-deprecated-index-sections",
22711 no_class, &use_deprecated_index_sections, _("\
22712 Set whether to use deprecated gdb_index sections."), _("\
22713 Show whether to use deprecated gdb_index sections."), _("\
22714 When enabled, deprecated .gdb_index sections are used anyway.\n\
22715 Normally they are ignored either because of a missing feature or\n\
22716 performance issue.\n\
22717 Warning: This option must be enabled before gdb reads the file."),
22720 &setlist, &showlist);
22722 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
22724 Save a gdb-index file.\n\
22725 Usage: save gdb-index DIRECTORY"),
22727 set_cmd_completer (c, filename_completer);
22729 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
22730 &dwarf2_locexpr_funcs);
22731 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
22732 &dwarf2_loclist_funcs);
22734 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
22735 &dwarf2_block_frame_base_locexpr_funcs);
22736 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
22737 &dwarf2_block_frame_base_loclist_funcs);