1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2013 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"
74 #include "gdb_string.h"
75 #include "gdb_assert.h"
76 #include <sys/types.h>
78 typedef struct symbol *symbolp;
81 /* When non-zero, print basic high level tracing messages.
82 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
83 static int dwarf2_read_debug = 0;
85 /* When non-zero, dump DIEs after they are read in. */
86 static unsigned int dwarf2_die_debug = 0;
88 /* When non-zero, cross-check physname against demangler. */
89 static int check_physname = 0;
91 /* When non-zero, do not reject deprecated .gdb_index sections. */
92 static int use_deprecated_index_sections = 0;
94 static const struct objfile_data *dwarf2_objfile_data_key;
96 /* The "aclass" indices for various kinds of computed DWARF symbols. */
98 static int dwarf2_locexpr_index;
99 static int dwarf2_loclist_index;
100 static int dwarf2_locexpr_block_index;
101 static int dwarf2_loclist_block_index;
103 struct dwarf2_section_info
106 const gdb_byte *buffer;
108 /* True if we have tried to read this section. */
112 typedef struct dwarf2_section_info dwarf2_section_info_def;
113 DEF_VEC_O (dwarf2_section_info_def);
115 /* All offsets in the index are of this type. It must be
116 architecture-independent. */
117 typedef uint32_t offset_type;
119 DEF_VEC_I (offset_type);
121 /* Ensure only legit values are used. */
122 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
124 gdb_assert ((unsigned int) (value) <= 1); \
125 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
128 /* Ensure only legit values are used. */
129 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
131 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
132 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
133 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
136 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
137 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
139 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
140 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
143 /* A description of the mapped index. The file format is described in
144 a comment by the code that writes the index. */
147 /* Index data format version. */
150 /* The total length of the buffer. */
153 /* A pointer to the address table data. */
154 const gdb_byte *address_table;
156 /* Size of the address table data in bytes. */
157 offset_type address_table_size;
159 /* The symbol table, implemented as a hash table. */
160 const offset_type *symbol_table;
162 /* Size in slots, each slot is 2 offset_types. */
163 offset_type symbol_table_slots;
165 /* A pointer to the constant pool. */
166 const char *constant_pool;
169 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
170 DEF_VEC_P (dwarf2_per_cu_ptr);
172 /* Collection of data recorded per objfile.
173 This hangs off of dwarf2_objfile_data_key. */
175 struct dwarf2_per_objfile
177 struct dwarf2_section_info info;
178 struct dwarf2_section_info abbrev;
179 struct dwarf2_section_info line;
180 struct dwarf2_section_info loc;
181 struct dwarf2_section_info macinfo;
182 struct dwarf2_section_info macro;
183 struct dwarf2_section_info str;
184 struct dwarf2_section_info ranges;
185 struct dwarf2_section_info addr;
186 struct dwarf2_section_info frame;
187 struct dwarf2_section_info eh_frame;
188 struct dwarf2_section_info gdb_index;
190 VEC (dwarf2_section_info_def) *types;
193 struct objfile *objfile;
195 /* Table of all the compilation units. This is used to locate
196 the target compilation unit of a particular reference. */
197 struct dwarf2_per_cu_data **all_comp_units;
199 /* The number of compilation units in ALL_COMP_UNITS. */
202 /* The number of .debug_types-related CUs. */
205 /* The .debug_types-related CUs (TUs).
206 This is stored in malloc space because we may realloc it. */
207 struct signatured_type **all_type_units;
209 /* The number of entries in all_type_unit_groups. */
210 int n_type_unit_groups;
212 /* Table of type unit groups.
213 This exists to make it easy to iterate over all CUs and TU groups. */
214 struct type_unit_group **all_type_unit_groups;
216 /* Table of struct type_unit_group objects.
217 The hash key is the DW_AT_stmt_list value. */
218 htab_t type_unit_groups;
220 /* A table mapping .debug_types signatures to its signatured_type entry.
221 This is NULL if the .debug_types section hasn't been read in yet. */
222 htab_t signatured_types;
224 /* Type unit statistics, to see how well the scaling improvements
228 int nr_uniq_abbrev_tables;
230 int nr_symtab_sharers;
231 int nr_stmt_less_type_units;
234 /* A chain of compilation units that are currently read in, so that
235 they can be freed later. */
236 struct dwarf2_per_cu_data *read_in_chain;
238 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
239 This is NULL if the table hasn't been allocated yet. */
242 /* Non-zero if we've check for whether there is a DWP file. */
245 /* The DWP file if there is one, or NULL. */
246 struct dwp_file *dwp_file;
248 /* The shared '.dwz' file, if one exists. This is used when the
249 original data was compressed using 'dwz -m'. */
250 struct dwz_file *dwz_file;
252 /* A flag indicating wether this objfile has a section loaded at a
254 int has_section_at_zero;
256 /* True if we are using the mapped index,
257 or we are faking it for OBJF_READNOW's sake. */
258 unsigned char using_index;
260 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
261 struct mapped_index *index_table;
263 /* When using index_table, this keeps track of all quick_file_names entries.
264 TUs typically share line table entries with a CU, so we maintain a
265 separate table of all line table entries to support the sharing.
266 Note that while there can be way more TUs than CUs, we've already
267 sorted all the TUs into "type unit groups", grouped by their
268 DW_AT_stmt_list value. Therefore the only sharing done here is with a
269 CU and its associated TU group if there is one. */
270 htab_t quick_file_names_table;
272 /* Set during partial symbol reading, to prevent queueing of full
274 int reading_partial_symbols;
276 /* Table mapping type DIEs to their struct type *.
277 This is NULL if not allocated yet.
278 The mapping is done via (CU/TU + DIE offset) -> type. */
279 htab_t die_type_hash;
281 /* The CUs we recently read. */
282 VEC (dwarf2_per_cu_ptr) *just_read_cus;
285 static struct dwarf2_per_objfile *dwarf2_per_objfile;
287 /* Default names of the debugging sections. */
289 /* Note that if the debugging section has been compressed, it might
290 have a name like .zdebug_info. */
292 static const struct dwarf2_debug_sections dwarf2_elf_names =
294 { ".debug_info", ".zdebug_info" },
295 { ".debug_abbrev", ".zdebug_abbrev" },
296 { ".debug_line", ".zdebug_line" },
297 { ".debug_loc", ".zdebug_loc" },
298 { ".debug_macinfo", ".zdebug_macinfo" },
299 { ".debug_macro", ".zdebug_macro" },
300 { ".debug_str", ".zdebug_str" },
301 { ".debug_ranges", ".zdebug_ranges" },
302 { ".debug_types", ".zdebug_types" },
303 { ".debug_addr", ".zdebug_addr" },
304 { ".debug_frame", ".zdebug_frame" },
305 { ".eh_frame", NULL },
306 { ".gdb_index", ".zgdb_index" },
310 /* List of DWO/DWP sections. */
312 static const struct dwop_section_names
314 struct dwarf2_section_names abbrev_dwo;
315 struct dwarf2_section_names info_dwo;
316 struct dwarf2_section_names line_dwo;
317 struct dwarf2_section_names loc_dwo;
318 struct dwarf2_section_names macinfo_dwo;
319 struct dwarf2_section_names macro_dwo;
320 struct dwarf2_section_names str_dwo;
321 struct dwarf2_section_names str_offsets_dwo;
322 struct dwarf2_section_names types_dwo;
323 struct dwarf2_section_names cu_index;
324 struct dwarf2_section_names tu_index;
328 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
329 { ".debug_info.dwo", ".zdebug_info.dwo" },
330 { ".debug_line.dwo", ".zdebug_line.dwo" },
331 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
332 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
333 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
334 { ".debug_str.dwo", ".zdebug_str.dwo" },
335 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
336 { ".debug_types.dwo", ".zdebug_types.dwo" },
337 { ".debug_cu_index", ".zdebug_cu_index" },
338 { ".debug_tu_index", ".zdebug_tu_index" },
341 /* local data types */
343 /* The data in a compilation unit header, after target2host
344 translation, looks like this. */
345 struct comp_unit_head
349 unsigned char addr_size;
350 unsigned char signed_addr_p;
351 sect_offset abbrev_offset;
353 /* Size of file offsets; either 4 or 8. */
354 unsigned int offset_size;
356 /* Size of the length field; either 4 or 12. */
357 unsigned int initial_length_size;
359 /* Offset to the first byte of this compilation unit header in the
360 .debug_info section, for resolving relative reference dies. */
363 /* Offset to first die in this cu from the start of the cu.
364 This will be the first byte following the compilation unit header. */
365 cu_offset first_die_offset;
368 /* Type used for delaying computation of method physnames.
369 See comments for compute_delayed_physnames. */
370 struct delayed_method_info
372 /* The type to which the method is attached, i.e., its parent class. */
375 /* The index of the method in the type's function fieldlists. */
378 /* The index of the method in the fieldlist. */
381 /* The name of the DIE. */
384 /* The DIE associated with this method. */
385 struct die_info *die;
388 typedef struct delayed_method_info delayed_method_info;
389 DEF_VEC_O (delayed_method_info);
391 /* Internal state when decoding a particular compilation unit. */
394 /* The objfile containing this compilation unit. */
395 struct objfile *objfile;
397 /* The header of the compilation unit. */
398 struct comp_unit_head header;
400 /* Base address of this compilation unit. */
401 CORE_ADDR base_address;
403 /* Non-zero if base_address has been set. */
406 /* The language we are debugging. */
407 enum language language;
408 const struct language_defn *language_defn;
410 const char *producer;
412 /* The generic symbol table building routines have separate lists for
413 file scope symbols and all all other scopes (local scopes). So
414 we need to select the right one to pass to add_symbol_to_list().
415 We do it by keeping a pointer to the correct list in list_in_scope.
417 FIXME: The original dwarf code just treated the file scope as the
418 first local scope, and all other local scopes as nested local
419 scopes, and worked fine. Check to see if we really need to
420 distinguish these in buildsym.c. */
421 struct pending **list_in_scope;
423 /* The abbrev table for this CU.
424 Normally this points to the abbrev table in the objfile.
425 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
426 struct abbrev_table *abbrev_table;
428 /* Hash table holding all the loaded partial DIEs
429 with partial_die->offset.SECT_OFF as hash. */
432 /* Storage for things with the same lifetime as this read-in compilation
433 unit, including partial DIEs. */
434 struct obstack comp_unit_obstack;
436 /* When multiple dwarf2_cu structures are living in memory, this field
437 chains them all together, so that they can be released efficiently.
438 We will probably also want a generation counter so that most-recently-used
439 compilation units are cached... */
440 struct dwarf2_per_cu_data *read_in_chain;
442 /* Backchain to our per_cu entry if the tree has been built. */
443 struct dwarf2_per_cu_data *per_cu;
445 /* How many compilation units ago was this CU last referenced? */
448 /* A hash table of DIE cu_offset for following references with
449 die_info->offset.sect_off as hash. */
452 /* Full DIEs if read in. */
453 struct die_info *dies;
455 /* A set of pointers to dwarf2_per_cu_data objects for compilation
456 units referenced by this one. Only set during full symbol processing;
457 partial symbol tables do not have dependencies. */
460 /* Header data from the line table, during full symbol processing. */
461 struct line_header *line_header;
463 /* A list of methods which need to have physnames computed
464 after all type information has been read. */
465 VEC (delayed_method_info) *method_list;
467 /* To be copied to symtab->call_site_htab. */
468 htab_t call_site_htab;
470 /* Non-NULL if this CU came from a DWO file.
471 There is an invariant here that is important to remember:
472 Except for attributes copied from the top level DIE in the "main"
473 (or "stub") file in preparation for reading the DWO file
474 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
475 Either there isn't a DWO file (in which case this is NULL and the point
476 is moot), or there is and either we're not going to read it (in which
477 case this is NULL) or there is and we are reading it (in which case this
479 struct dwo_unit *dwo_unit;
481 /* The DW_AT_addr_base attribute if present, zero otherwise
482 (zero is a valid value though).
483 Note this value comes from the stub CU/TU's DIE. */
486 /* The DW_AT_ranges_base attribute if present, zero otherwise
487 (zero is a valid value though).
488 Note this value comes from the stub CU/TU's DIE.
489 Also note that the value is zero in the non-DWO case so this value can
490 be used without needing to know whether DWO files are in use or not.
491 N.B. This does not apply to DW_AT_ranges appearing in
492 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
493 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
494 DW_AT_ranges_base *would* have to be applied, and we'd have to care
495 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
496 ULONGEST ranges_base;
498 /* Mark used when releasing cached dies. */
499 unsigned int mark : 1;
501 /* This CU references .debug_loc. See the symtab->locations_valid field.
502 This test is imperfect as there may exist optimized debug code not using
503 any location list and still facing inlining issues if handled as
504 unoptimized code. For a future better test see GCC PR other/32998. */
505 unsigned int has_loclist : 1;
507 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
508 if all the producer_is_* fields are valid. This information is cached
509 because profiling CU expansion showed excessive time spent in
510 producer_is_gxx_lt_4_6. */
511 unsigned int checked_producer : 1;
512 unsigned int producer_is_gxx_lt_4_6 : 1;
513 unsigned int producer_is_gcc_lt_4_3 : 1;
514 unsigned int producer_is_icc : 1;
516 /* When set, the file that we're processing is known to have
517 debugging info for C++ namespaces. GCC 3.3.x did not produce
518 this information, but later versions do. */
520 unsigned int processing_has_namespace_info : 1;
523 /* Persistent data held for a compilation unit, even when not
524 processing it. We put a pointer to this structure in the
525 read_symtab_private field of the psymtab. */
527 struct dwarf2_per_cu_data
529 /* The start offset and length of this compilation unit.
530 NOTE: Unlike comp_unit_head.length, this length includes
532 If the DIE refers to a DWO file, this is always of the original die,
537 /* Flag indicating this compilation unit will be read in before
538 any of the current compilation units are processed. */
539 unsigned int queued : 1;
541 /* This flag will be set when reading partial DIEs if we need to load
542 absolutely all DIEs for this compilation unit, instead of just the ones
543 we think are interesting. It gets set if we look for a DIE in the
544 hash table and don't find it. */
545 unsigned int load_all_dies : 1;
547 /* Non-zero if this CU is from .debug_types.
548 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
550 unsigned int is_debug_types : 1;
552 /* Non-zero if this CU is from the .dwz file. */
553 unsigned int is_dwz : 1;
555 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
556 This flag is only valid if is_debug_types is true.
557 We can't read a CU directly from a DWO file: There are required
558 attributes in the stub. */
559 unsigned int reading_dwo_directly : 1;
561 /* The section this CU/TU lives in.
562 If the DIE refers to a DWO file, this is always the original die,
564 struct dwarf2_section_info *section;
566 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
567 of the CU cache it gets reset to NULL again. */
568 struct dwarf2_cu *cu;
570 /* The corresponding objfile.
571 Normally we can get the objfile from dwarf2_per_objfile.
572 However we can enter this file with just a "per_cu" handle. */
573 struct objfile *objfile;
575 /* When using partial symbol tables, the 'psymtab' field is active.
576 Otherwise the 'quick' field is active. */
579 /* The partial symbol table associated with this compilation unit,
580 or NULL for unread partial units. */
581 struct partial_symtab *psymtab;
583 /* Data needed by the "quick" functions. */
584 struct dwarf2_per_cu_quick_data *quick;
587 /* The CUs we import using DW_TAG_imported_unit. This is filled in
588 while reading psymtabs, used to compute the psymtab dependencies,
589 and then cleared. Then it is filled in again while reading full
590 symbols, and only deleted when the objfile is destroyed.
592 This is also used to work around a difference between the way gold
593 generates .gdb_index version <=7 and the way gdb does. Arguably this
594 is a gold bug. For symbols coming from TUs, gold records in the index
595 the CU that includes the TU instead of the TU itself. This breaks
596 dw2_lookup_symbol: It assumes that if the index says symbol X lives
597 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
598 will find X. Alas TUs live in their own symtab, so after expanding CU Y
599 we need to look in TU Z to find X. Fortunately, this is akin to
600 DW_TAG_imported_unit, so we just use the same mechanism: For
601 .gdb_index version <=7 this also records the TUs that the CU referred
602 to. Concurrently with this change gdb was modified to emit version 8
603 indices so we only pay a price for gold generated indices. */
604 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
607 /* Entry in the signatured_types hash table. */
609 struct signatured_type
611 /* The "per_cu" object of this type.
612 This struct is used iff per_cu.is_debug_types.
613 N.B.: This is the first member so that it's easy to convert pointers
615 struct dwarf2_per_cu_data per_cu;
617 /* The type's signature. */
620 /* Offset in the TU of the type's DIE, as read from the TU header.
621 If this TU is a DWO stub and the definition lives in a DWO file
622 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
623 cu_offset type_offset_in_tu;
625 /* Offset in the section of the type's DIE.
626 If the definition lives in a DWO file, this is the offset in the
627 .debug_types.dwo section.
628 The value is zero until the actual value is known.
629 Zero is otherwise not a valid section offset. */
630 sect_offset type_offset_in_section;
632 /* Type units are grouped by their DW_AT_stmt_list entry so that they
633 can share them. This points to the containing symtab. */
634 struct type_unit_group *type_unit_group;
637 The first time we encounter this type we fully read it in and install it
638 in the symbol tables. Subsequent times we only need the type. */
641 /* Containing DWO unit.
642 This field is valid iff per_cu.reading_dwo_directly. */
643 struct dwo_unit *dwo_unit;
646 typedef struct signatured_type *sig_type_ptr;
647 DEF_VEC_P (sig_type_ptr);
649 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
650 This includes type_unit_group and quick_file_names. */
652 struct stmt_list_hash
654 /* The DWO unit this table is from or NULL if there is none. */
655 struct dwo_unit *dwo_unit;
657 /* Offset in .debug_line or .debug_line.dwo. */
658 sect_offset line_offset;
661 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
662 an object of this type. */
664 struct type_unit_group
666 /* dwarf2read.c's main "handle" on a TU symtab.
667 To simplify things we create an artificial CU that "includes" all the
668 type units using this stmt_list so that the rest of the code still has
669 a "per_cu" handle on the symtab.
670 This PER_CU is recognized by having no section. */
671 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
672 struct dwarf2_per_cu_data per_cu;
674 /* The TUs that share this DW_AT_stmt_list entry.
675 This is added to while parsing type units to build partial symtabs,
676 and is deleted afterwards and not used again. */
677 VEC (sig_type_ptr) *tus;
679 /* The primary symtab.
680 Type units in a group needn't all be defined in the same source file,
681 so we create an essentially anonymous symtab as the primary symtab. */
682 struct symtab *primary_symtab;
684 /* The data used to construct the hash key. */
685 struct stmt_list_hash hash;
687 /* The number of symtabs from the line header.
688 The value here must match line_header.num_file_names. */
689 unsigned int num_symtabs;
691 /* The symbol tables for this TU (obtained from the files listed in
693 WARNING: The order of entries here must match the order of entries
694 in the line header. After the first TU using this type_unit_group, the
695 line header for the subsequent TUs is recreated from this. This is done
696 because we need to use the same symtabs for each TU using the same
697 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
698 there's no guarantee the line header doesn't have duplicate entries. */
699 struct symtab **symtabs;
702 /* These sections are what may appear in a DWO file. */
706 struct dwarf2_section_info abbrev;
707 struct dwarf2_section_info line;
708 struct dwarf2_section_info loc;
709 struct dwarf2_section_info macinfo;
710 struct dwarf2_section_info macro;
711 struct dwarf2_section_info str;
712 struct dwarf2_section_info str_offsets;
713 /* In the case of a virtual DWO file, these two are unused. */
714 struct dwarf2_section_info info;
715 VEC (dwarf2_section_info_def) *types;
718 /* CUs/TUs in DWP/DWO files. */
722 /* Backlink to the containing struct dwo_file. */
723 struct dwo_file *dwo_file;
725 /* The "id" that distinguishes this CU/TU.
726 .debug_info calls this "dwo_id", .debug_types calls this "signature".
727 Since signatures came first, we stick with it for consistency. */
730 /* The section this CU/TU lives in, in the DWO file. */
731 struct dwarf2_section_info *section;
733 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
737 /* For types, offset in the type's DIE of the type defined by this TU. */
738 cu_offset type_offset_in_tu;
741 /* Data for one DWO file.
742 This includes virtual DWO files that have been packaged into a
747 /* The DW_AT_GNU_dwo_name attribute.
748 For virtual DWO files the name is constructed from the section offsets
749 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
750 from related CU+TUs. */
751 const char *dwo_name;
753 /* The DW_AT_comp_dir attribute. */
754 const char *comp_dir;
756 /* The bfd, when the file is open. Otherwise this is NULL.
757 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
760 /* Section info for this file. */
761 struct dwo_sections sections;
763 /* The CU in the file.
764 We only support one because having more than one requires hacking the
765 dwo_name of each to match, which is highly unlikely to happen.
766 Doing this means all TUs can share comp_dir: We also assume that
767 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
770 /* Table of TUs in the file.
771 Each element is a struct dwo_unit. */
775 /* These sections are what may appear in a DWP file. */
779 struct dwarf2_section_info str;
780 struct dwarf2_section_info cu_index;
781 struct dwarf2_section_info tu_index;
782 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
783 by section number. We don't need to record them here. */
786 /* These sections are what may appear in a virtual DWO file. */
788 struct virtual_dwo_sections
790 struct dwarf2_section_info abbrev;
791 struct dwarf2_section_info line;
792 struct dwarf2_section_info loc;
793 struct dwarf2_section_info macinfo;
794 struct dwarf2_section_info macro;
795 struct dwarf2_section_info str_offsets;
796 /* Each DWP hash table entry records one CU or one TU.
797 That is recorded here, and copied to dwo_unit.section. */
798 struct dwarf2_section_info info_or_types;
801 /* Contents of DWP hash tables. */
803 struct dwp_hash_table
805 uint32_t nr_units, nr_slots;
806 const gdb_byte *hash_table, *unit_table, *section_pool;
809 /* Data for one DWP file. */
813 /* Name of the file. */
819 /* Section info for this file. */
820 struct dwp_sections sections;
822 /* Table of CUs in the file. */
823 const struct dwp_hash_table *cus;
825 /* Table of TUs in the file. */
826 const struct dwp_hash_table *tus;
828 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
831 /* Table to map ELF section numbers to their sections. */
832 unsigned int num_sections;
833 asection **elf_sections;
836 /* This represents a '.dwz' file. */
840 /* A dwz file can only contain a few sections. */
841 struct dwarf2_section_info abbrev;
842 struct dwarf2_section_info info;
843 struct dwarf2_section_info str;
844 struct dwarf2_section_info line;
845 struct dwarf2_section_info macro;
846 struct dwarf2_section_info gdb_index;
852 /* Struct used to pass misc. parameters to read_die_and_children, et
853 al. which are used for both .debug_info and .debug_types dies.
854 All parameters here are unchanging for the life of the call. This
855 struct exists to abstract away the constant parameters of die reading. */
857 struct die_reader_specs
859 /* die_section->asection->owner. */
862 /* The CU of the DIE we are parsing. */
863 struct dwarf2_cu *cu;
865 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
866 struct dwo_file *dwo_file;
868 /* The section the die comes from.
869 This is either .debug_info or .debug_types, or the .dwo variants. */
870 struct dwarf2_section_info *die_section;
872 /* die_section->buffer. */
873 const gdb_byte *buffer;
875 /* The end of the buffer. */
876 const gdb_byte *buffer_end;
878 /* The value of the DW_AT_comp_dir attribute. */
879 const char *comp_dir;
882 /* Type of function passed to init_cutu_and_read_dies, et.al. */
883 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
884 const gdb_byte *info_ptr,
885 struct die_info *comp_unit_die,
889 /* The line number information for a compilation unit (found in the
890 .debug_line section) begins with a "statement program header",
891 which contains the following information. */
894 unsigned int total_length;
895 unsigned short version;
896 unsigned int header_length;
897 unsigned char minimum_instruction_length;
898 unsigned char maximum_ops_per_instruction;
899 unsigned char default_is_stmt;
901 unsigned char line_range;
902 unsigned char opcode_base;
904 /* standard_opcode_lengths[i] is the number of operands for the
905 standard opcode whose value is i. This means that
906 standard_opcode_lengths[0] is unused, and the last meaningful
907 element is standard_opcode_lengths[opcode_base - 1]. */
908 unsigned char *standard_opcode_lengths;
910 /* The include_directories table. NOTE! These strings are not
911 allocated with xmalloc; instead, they are pointers into
912 debug_line_buffer. If you try to free them, `free' will get
914 unsigned int num_include_dirs, include_dirs_size;
915 const char **include_dirs;
917 /* The file_names table. NOTE! These strings are not allocated
918 with xmalloc; instead, they are pointers into debug_line_buffer.
919 Don't try to free them directly. */
920 unsigned int num_file_names, file_names_size;
924 unsigned int dir_index;
925 unsigned int mod_time;
927 int included_p; /* Non-zero if referenced by the Line Number Program. */
928 struct symtab *symtab; /* The associated symbol table, if any. */
931 /* The start and end of the statement program following this
932 header. These point into dwarf2_per_objfile->line_buffer. */
933 const gdb_byte *statement_program_start, *statement_program_end;
936 /* When we construct a partial symbol table entry we only
937 need this much information. */
938 struct partial_die_info
940 /* Offset of this DIE. */
943 /* DWARF-2 tag for this DIE. */
944 ENUM_BITFIELD(dwarf_tag) tag : 16;
946 /* Assorted flags describing the data found in this DIE. */
947 unsigned int has_children : 1;
948 unsigned int is_external : 1;
949 unsigned int is_declaration : 1;
950 unsigned int has_type : 1;
951 unsigned int has_specification : 1;
952 unsigned int has_pc_info : 1;
953 unsigned int may_be_inlined : 1;
955 /* Flag set if the SCOPE field of this structure has been
957 unsigned int scope_set : 1;
959 /* Flag set if the DIE has a byte_size attribute. */
960 unsigned int has_byte_size : 1;
962 /* Flag set if any of the DIE's children are template arguments. */
963 unsigned int has_template_arguments : 1;
965 /* Flag set if fixup_partial_die has been called on this die. */
966 unsigned int fixup_called : 1;
968 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
969 unsigned int is_dwz : 1;
971 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
972 unsigned int spec_is_dwz : 1;
974 /* The name of this DIE. Normally the value of DW_AT_name, but
975 sometimes a default name for unnamed DIEs. */
978 /* The linkage name, if present. */
979 const char *linkage_name;
981 /* The scope to prepend to our children. This is generally
982 allocated on the comp_unit_obstack, so will disappear
983 when this compilation unit leaves the cache. */
986 /* Some data associated with the partial DIE. The tag determines
987 which field is live. */
990 /* The location description associated with this DIE, if any. */
991 struct dwarf_block *locdesc;
992 /* The offset of an import, for DW_TAG_imported_unit. */
996 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1000 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1001 DW_AT_sibling, if any. */
1002 /* NOTE: This member isn't strictly necessary, read_partial_die could
1003 return DW_AT_sibling values to its caller load_partial_dies. */
1004 const gdb_byte *sibling;
1006 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1007 DW_AT_specification (or DW_AT_abstract_origin or
1008 DW_AT_extension). */
1009 sect_offset spec_offset;
1011 /* Pointers to this DIE's parent, first child, and next sibling,
1013 struct partial_die_info *die_parent, *die_child, *die_sibling;
1016 /* This data structure holds the information of an abbrev. */
1019 unsigned int number; /* number identifying abbrev */
1020 enum dwarf_tag tag; /* dwarf tag */
1021 unsigned short has_children; /* boolean */
1022 unsigned short num_attrs; /* number of attributes */
1023 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1024 struct abbrev_info *next; /* next in chain */
1029 ENUM_BITFIELD(dwarf_attribute) name : 16;
1030 ENUM_BITFIELD(dwarf_form) form : 16;
1033 /* Size of abbrev_table.abbrev_hash_table. */
1034 #define ABBREV_HASH_SIZE 121
1036 /* Top level data structure to contain an abbreviation table. */
1040 /* Where the abbrev table came from.
1041 This is used as a sanity check when the table is used. */
1044 /* Storage for the abbrev table. */
1045 struct obstack abbrev_obstack;
1047 /* Hash table of abbrevs.
1048 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1049 It could be statically allocated, but the previous code didn't so we
1051 struct abbrev_info **abbrevs;
1054 /* Attributes have a name and a value. */
1057 ENUM_BITFIELD(dwarf_attribute) name : 16;
1058 ENUM_BITFIELD(dwarf_form) form : 15;
1060 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1061 field should be in u.str (existing only for DW_STRING) but it is kept
1062 here for better struct attribute alignment. */
1063 unsigned int string_is_canonical : 1;
1068 struct dwarf_block *blk;
1077 /* This data structure holds a complete die structure. */
1080 /* DWARF-2 tag for this DIE. */
1081 ENUM_BITFIELD(dwarf_tag) tag : 16;
1083 /* Number of attributes */
1084 unsigned char num_attrs;
1086 /* True if we're presently building the full type name for the
1087 type derived from this DIE. */
1088 unsigned char building_fullname : 1;
1091 unsigned int abbrev;
1093 /* Offset in .debug_info or .debug_types section. */
1096 /* The dies in a compilation unit form an n-ary tree. PARENT
1097 points to this die's parent; CHILD points to the first child of
1098 this node; and all the children of a given node are chained
1099 together via their SIBLING fields. */
1100 struct die_info *child; /* Its first child, if any. */
1101 struct die_info *sibling; /* Its next sibling, if any. */
1102 struct die_info *parent; /* Its parent, if any. */
1104 /* An array of attributes, with NUM_ATTRS elements. There may be
1105 zero, but it's not common and zero-sized arrays are not
1106 sufficiently portable C. */
1107 struct attribute attrs[1];
1110 /* Get at parts of an attribute structure. */
1112 #define DW_STRING(attr) ((attr)->u.str)
1113 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1114 #define DW_UNSND(attr) ((attr)->u.unsnd)
1115 #define DW_BLOCK(attr) ((attr)->u.blk)
1116 #define DW_SND(attr) ((attr)->u.snd)
1117 #define DW_ADDR(attr) ((attr)->u.addr)
1118 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1120 /* Blocks are a bunch of untyped bytes. */
1125 /* Valid only if SIZE is not zero. */
1126 const gdb_byte *data;
1129 #ifndef ATTR_ALLOC_CHUNK
1130 #define ATTR_ALLOC_CHUNK 4
1133 /* Allocate fields for structs, unions and enums in this size. */
1134 #ifndef DW_FIELD_ALLOC_CHUNK
1135 #define DW_FIELD_ALLOC_CHUNK 4
1138 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1139 but this would require a corresponding change in unpack_field_as_long
1141 static int bits_per_byte = 8;
1143 /* The routines that read and process dies for a C struct or C++ class
1144 pass lists of data member fields and lists of member function fields
1145 in an instance of a field_info structure, as defined below. */
1148 /* List of data member and baseclasses fields. */
1151 struct nextfield *next;
1156 *fields, *baseclasses;
1158 /* Number of fields (including baseclasses). */
1161 /* Number of baseclasses. */
1164 /* Set if the accesibility of one of the fields is not public. */
1165 int non_public_fields;
1167 /* Member function fields array, entries are allocated in the order they
1168 are encountered in the object file. */
1171 struct nextfnfield *next;
1172 struct fn_field fnfield;
1176 /* Member function fieldlist array, contains name of possibly overloaded
1177 member function, number of overloaded member functions and a pointer
1178 to the head of the member function field chain. */
1183 struct nextfnfield *head;
1187 /* Number of entries in the fnfieldlists array. */
1190 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1191 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1192 struct typedef_field_list
1194 struct typedef_field field;
1195 struct typedef_field_list *next;
1197 *typedef_field_list;
1198 unsigned typedef_field_list_count;
1201 /* One item on the queue of compilation units to read in full symbols
1203 struct dwarf2_queue_item
1205 struct dwarf2_per_cu_data *per_cu;
1206 enum language pretend_language;
1207 struct dwarf2_queue_item *next;
1210 /* The current queue. */
1211 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1213 /* Loaded secondary compilation units are kept in memory until they
1214 have not been referenced for the processing of this many
1215 compilation units. Set this to zero to disable caching. Cache
1216 sizes of up to at least twenty will improve startup time for
1217 typical inter-CU-reference binaries, at an obvious memory cost. */
1218 static int dwarf2_max_cache_age = 5;
1220 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1221 struct cmd_list_element *c, const char *value)
1223 fprintf_filtered (file, _("The upper bound on the age of cached "
1224 "dwarf2 compilation units is %s.\n"),
1229 /* Various complaints about symbol reading that don't abort the process. */
1232 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1234 complaint (&symfile_complaints,
1235 _("statement list doesn't fit in .debug_line section"));
1239 dwarf2_debug_line_missing_file_complaint (void)
1241 complaint (&symfile_complaints,
1242 _(".debug_line section has line data without a file"));
1246 dwarf2_debug_line_missing_end_sequence_complaint (void)
1248 complaint (&symfile_complaints,
1249 _(".debug_line section has line "
1250 "program sequence without an end"));
1254 dwarf2_complex_location_expr_complaint (void)
1256 complaint (&symfile_complaints, _("location expression too complex"));
1260 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1263 complaint (&symfile_complaints,
1264 _("const value length mismatch for '%s', got %d, expected %d"),
1269 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1271 complaint (&symfile_complaints,
1272 _("debug info runs off end of %s section"
1274 section->asection->name,
1275 bfd_get_filename (section->asection->owner));
1279 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1281 complaint (&symfile_complaints,
1282 _("macro debug info contains a "
1283 "malformed macro definition:\n`%s'"),
1288 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1290 complaint (&symfile_complaints,
1291 _("invalid attribute class or form for '%s' in '%s'"),
1295 /* local function prototypes */
1297 static void dwarf2_locate_sections (bfd *, asection *, void *);
1299 static void dwarf2_find_base_address (struct die_info *die,
1300 struct dwarf2_cu *cu);
1302 static struct partial_symtab *create_partial_symtab
1303 (struct dwarf2_per_cu_data *per_cu, const char *name);
1305 static void dwarf2_build_psymtabs_hard (struct objfile *);
1307 static void scan_partial_symbols (struct partial_die_info *,
1308 CORE_ADDR *, CORE_ADDR *,
1309 int, struct dwarf2_cu *);
1311 static void add_partial_symbol (struct partial_die_info *,
1312 struct dwarf2_cu *);
1314 static void add_partial_namespace (struct partial_die_info *pdi,
1315 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1316 int need_pc, struct dwarf2_cu *cu);
1318 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1319 CORE_ADDR *highpc, int need_pc,
1320 struct dwarf2_cu *cu);
1322 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1323 struct dwarf2_cu *cu);
1325 static void add_partial_subprogram (struct partial_die_info *pdi,
1326 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1327 int need_pc, struct dwarf2_cu *cu);
1329 static void dwarf2_read_symtab (struct partial_symtab *,
1332 static void psymtab_to_symtab_1 (struct partial_symtab *);
1334 static struct abbrev_info *abbrev_table_lookup_abbrev
1335 (const struct abbrev_table *, unsigned int);
1337 static struct abbrev_table *abbrev_table_read_table
1338 (struct dwarf2_section_info *, sect_offset);
1340 static void abbrev_table_free (struct abbrev_table *);
1342 static void abbrev_table_free_cleanup (void *);
1344 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1345 struct dwarf2_section_info *);
1347 static void dwarf2_free_abbrev_table (void *);
1349 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1351 static struct partial_die_info *load_partial_dies
1352 (const struct die_reader_specs *, const gdb_byte *, int);
1354 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1355 struct partial_die_info *,
1356 struct abbrev_info *,
1360 static struct partial_die_info *find_partial_die (sect_offset, int,
1361 struct dwarf2_cu *);
1363 static void fixup_partial_die (struct partial_die_info *,
1364 struct dwarf2_cu *);
1366 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1367 struct attribute *, struct attr_abbrev *,
1370 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1372 static int read_1_signed_byte (bfd *, const gdb_byte *);
1374 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1376 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1378 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1380 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1383 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1385 static LONGEST read_checked_initial_length_and_offset
1386 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1387 unsigned int *, unsigned int *);
1389 static LONGEST read_offset (bfd *, const gdb_byte *,
1390 const struct comp_unit_head *,
1393 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1395 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1398 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1400 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1402 static const char *read_indirect_string (bfd *, const gdb_byte *,
1403 const struct comp_unit_head *,
1406 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1408 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1410 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1412 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1416 static const char *read_str_index (const struct die_reader_specs *reader,
1417 struct dwarf2_cu *cu, ULONGEST str_index);
1419 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1421 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1422 struct dwarf2_cu *);
1424 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1427 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1428 struct dwarf2_cu *cu);
1430 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1432 static struct die_info *die_specification (struct die_info *die,
1433 struct dwarf2_cu **);
1435 static void free_line_header (struct line_header *lh);
1437 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1438 struct dwarf2_cu *cu);
1440 static void dwarf_decode_lines (struct line_header *, const char *,
1441 struct dwarf2_cu *, struct partial_symtab *,
1444 static void dwarf2_start_subfile (const char *, const char *, const char *);
1446 static void dwarf2_start_symtab (struct dwarf2_cu *,
1447 const char *, const char *, CORE_ADDR);
1449 static struct symbol *new_symbol (struct die_info *, struct type *,
1450 struct dwarf2_cu *);
1452 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1453 struct dwarf2_cu *, struct symbol *);
1455 static void dwarf2_const_value (struct attribute *, struct symbol *,
1456 struct dwarf2_cu *);
1458 static void dwarf2_const_value_attr (struct attribute *attr,
1461 struct obstack *obstack,
1462 struct dwarf2_cu *cu, LONGEST *value,
1463 const gdb_byte **bytes,
1464 struct dwarf2_locexpr_baton **baton);
1466 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1468 static int need_gnat_info (struct dwarf2_cu *);
1470 static struct type *die_descriptive_type (struct die_info *,
1471 struct dwarf2_cu *);
1473 static void set_descriptive_type (struct type *, struct die_info *,
1474 struct dwarf2_cu *);
1476 static struct type *die_containing_type (struct die_info *,
1477 struct dwarf2_cu *);
1479 static struct type *lookup_die_type (struct die_info *, struct attribute *,
1480 struct dwarf2_cu *);
1482 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1484 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1486 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1488 static char *typename_concat (struct obstack *obs, const char *prefix,
1489 const char *suffix, int physname,
1490 struct dwarf2_cu *cu);
1492 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1494 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1496 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1498 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1500 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1502 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1503 struct dwarf2_cu *, struct partial_symtab *);
1505 static int dwarf2_get_pc_bounds (struct die_info *,
1506 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1507 struct partial_symtab *);
1509 static void get_scope_pc_bounds (struct die_info *,
1510 CORE_ADDR *, CORE_ADDR *,
1511 struct dwarf2_cu *);
1513 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1514 CORE_ADDR, struct dwarf2_cu *);
1516 static void dwarf2_add_field (struct field_info *, struct die_info *,
1517 struct dwarf2_cu *);
1519 static void dwarf2_attach_fields_to_type (struct field_info *,
1520 struct type *, struct dwarf2_cu *);
1522 static void dwarf2_add_member_fn (struct field_info *,
1523 struct die_info *, struct type *,
1524 struct dwarf2_cu *);
1526 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1528 struct dwarf2_cu *);
1530 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1532 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1534 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1536 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1538 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1540 static struct type *read_module_type (struct die_info *die,
1541 struct dwarf2_cu *cu);
1543 static const char *namespace_name (struct die_info *die,
1544 int *is_anonymous, struct dwarf2_cu *);
1546 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1548 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1550 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1551 struct dwarf2_cu *);
1553 static struct die_info *read_die_and_siblings_1
1554 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1557 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1558 const gdb_byte *info_ptr,
1559 const gdb_byte **new_info_ptr,
1560 struct die_info *parent);
1562 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1563 struct die_info **, const gdb_byte *,
1566 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1567 struct die_info **, const gdb_byte *,
1570 static void process_die (struct die_info *, struct dwarf2_cu *);
1572 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1575 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1577 static const char *dwarf2_full_name (const char *name,
1578 struct die_info *die,
1579 struct dwarf2_cu *cu);
1581 static const char *dwarf2_physname (const char *name, struct die_info *die,
1582 struct dwarf2_cu *cu);
1584 static struct die_info *dwarf2_extension (struct die_info *die,
1585 struct dwarf2_cu **);
1587 static const char *dwarf_tag_name (unsigned int);
1589 static const char *dwarf_attr_name (unsigned int);
1591 static const char *dwarf_form_name (unsigned int);
1593 static char *dwarf_bool_name (unsigned int);
1595 static const char *dwarf_type_encoding_name (unsigned int);
1597 static struct die_info *sibling_die (struct die_info *);
1599 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1601 static void dump_die_for_error (struct die_info *);
1603 static void dump_die_1 (struct ui_file *, int level, int max_level,
1606 /*static*/ void dump_die (struct die_info *, int max_level);
1608 static void store_in_ref_table (struct die_info *,
1609 struct dwarf2_cu *);
1611 static int is_ref_attr (struct attribute *);
1613 static sect_offset dwarf2_get_ref_die_offset (struct attribute *);
1615 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int);
1617 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1619 struct dwarf2_cu **);
1621 static struct die_info *follow_die_ref (struct die_info *,
1623 struct dwarf2_cu **);
1625 static struct die_info *follow_die_sig (struct die_info *,
1627 struct dwarf2_cu **);
1629 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1630 struct dwarf2_cu *);
1632 static struct type *get_DW_AT_signature_type (struct die_info *,
1634 struct dwarf2_cu *);
1636 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1638 static void read_signatured_type (struct signatured_type *);
1640 static struct type_unit_group *get_type_unit_group
1641 (struct dwarf2_cu *, struct attribute *);
1643 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1645 /* memory allocation interface */
1647 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1649 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1651 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1654 static int attr_form_is_block (struct attribute *);
1656 static int attr_form_is_section_offset (struct attribute *);
1658 static int attr_form_is_constant (struct attribute *);
1660 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1661 struct dwarf2_loclist_baton *baton,
1662 struct attribute *attr);
1664 static void dwarf2_symbol_mark_computed (struct attribute *attr,
1666 struct dwarf2_cu *cu,
1669 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1670 const gdb_byte *info_ptr,
1671 struct abbrev_info *abbrev);
1673 static void free_stack_comp_unit (void *);
1675 static hashval_t partial_die_hash (const void *item);
1677 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1679 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1680 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1682 static void init_one_comp_unit (struct dwarf2_cu *cu,
1683 struct dwarf2_per_cu_data *per_cu);
1685 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1686 struct die_info *comp_unit_die,
1687 enum language pretend_language);
1689 static void free_heap_comp_unit (void *);
1691 static void free_cached_comp_units (void *);
1693 static void age_cached_comp_units (void);
1695 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1697 static struct type *set_die_type (struct die_info *, struct type *,
1698 struct dwarf2_cu *);
1700 static void create_all_comp_units (struct objfile *);
1702 static int create_all_type_units (struct objfile *);
1704 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1707 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1710 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1713 static void dwarf2_add_dependence (struct dwarf2_cu *,
1714 struct dwarf2_per_cu_data *);
1716 static void dwarf2_mark (struct dwarf2_cu *);
1718 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1720 static struct type *get_die_type_at_offset (sect_offset,
1721 struct dwarf2_per_cu_data *);
1723 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1725 static void dwarf2_release_queue (void *dummy);
1727 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1728 enum language pretend_language);
1730 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
1731 struct dwarf2_per_cu_data *per_cu,
1732 enum language pretend_language);
1734 static void process_queue (void);
1736 static void find_file_and_directory (struct die_info *die,
1737 struct dwarf2_cu *cu,
1738 const char **name, const char **comp_dir);
1740 static char *file_full_name (int file, struct line_header *lh,
1741 const char *comp_dir);
1743 static const gdb_byte *read_and_check_comp_unit_head
1744 (struct comp_unit_head *header,
1745 struct dwarf2_section_info *section,
1746 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1747 int is_debug_types_section);
1749 static void init_cutu_and_read_dies
1750 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1751 int use_existing_cu, int keep,
1752 die_reader_func_ftype *die_reader_func, void *data);
1754 static void init_cutu_and_read_dies_simple
1755 (struct dwarf2_per_cu_data *this_cu,
1756 die_reader_func_ftype *die_reader_func, void *data);
1758 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1760 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1762 static struct dwo_unit *lookup_dwo_in_dwp
1763 (struct dwp_file *dwp_file, const struct dwp_hash_table *htab,
1764 const char *comp_dir, ULONGEST signature, int is_debug_types);
1766 static struct dwp_file *get_dwp_file (void);
1768 static struct dwo_unit *lookup_dwo_comp_unit
1769 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1771 static struct dwo_unit *lookup_dwo_type_unit
1772 (struct signatured_type *, const char *, const char *);
1774 static void free_dwo_file_cleanup (void *);
1776 static void process_cu_includes (void);
1778 static void check_producer (struct dwarf2_cu *cu);
1782 /* Convert VALUE between big- and little-endian. */
1784 byte_swap (offset_type value)
1788 result = (value & 0xff) << 24;
1789 result |= (value & 0xff00) << 8;
1790 result |= (value & 0xff0000) >> 8;
1791 result |= (value & 0xff000000) >> 24;
1795 #define MAYBE_SWAP(V) byte_swap (V)
1798 #define MAYBE_SWAP(V) (V)
1799 #endif /* WORDS_BIGENDIAN */
1801 /* The suffix for an index file. */
1802 #define INDEX_SUFFIX ".gdb-index"
1804 /* Try to locate the sections we need for DWARF 2 debugging
1805 information and return true if we have enough to do something.
1806 NAMES points to the dwarf2 section names, or is NULL if the standard
1807 ELF names are used. */
1810 dwarf2_has_info (struct objfile *objfile,
1811 const struct dwarf2_debug_sections *names)
1813 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1814 if (!dwarf2_per_objfile)
1816 /* Initialize per-objfile state. */
1817 struct dwarf2_per_objfile *data
1818 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1820 memset (data, 0, sizeof (*data));
1821 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1822 dwarf2_per_objfile = data;
1824 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1826 dwarf2_per_objfile->objfile = objfile;
1828 return (dwarf2_per_objfile->info.asection != NULL
1829 && dwarf2_per_objfile->abbrev.asection != NULL);
1832 /* When loading sections, we look either for uncompressed section or for
1833 compressed section names. */
1836 section_is_p (const char *section_name,
1837 const struct dwarf2_section_names *names)
1839 if (names->normal != NULL
1840 && strcmp (section_name, names->normal) == 0)
1842 if (names->compressed != NULL
1843 && strcmp (section_name, names->compressed) == 0)
1848 /* This function is mapped across the sections and remembers the
1849 offset and size of each of the debugging sections we are interested
1853 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1855 const struct dwarf2_debug_sections *names;
1856 flagword aflag = bfd_get_section_flags (abfd, sectp);
1859 names = &dwarf2_elf_names;
1861 names = (const struct dwarf2_debug_sections *) vnames;
1863 if ((aflag & SEC_HAS_CONTENTS) == 0)
1866 else if (section_is_p (sectp->name, &names->info))
1868 dwarf2_per_objfile->info.asection = sectp;
1869 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1871 else if (section_is_p (sectp->name, &names->abbrev))
1873 dwarf2_per_objfile->abbrev.asection = sectp;
1874 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1876 else if (section_is_p (sectp->name, &names->line))
1878 dwarf2_per_objfile->line.asection = sectp;
1879 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1881 else if (section_is_p (sectp->name, &names->loc))
1883 dwarf2_per_objfile->loc.asection = sectp;
1884 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1886 else if (section_is_p (sectp->name, &names->macinfo))
1888 dwarf2_per_objfile->macinfo.asection = sectp;
1889 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1891 else if (section_is_p (sectp->name, &names->macro))
1893 dwarf2_per_objfile->macro.asection = sectp;
1894 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1896 else if (section_is_p (sectp->name, &names->str))
1898 dwarf2_per_objfile->str.asection = sectp;
1899 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1901 else if (section_is_p (sectp->name, &names->addr))
1903 dwarf2_per_objfile->addr.asection = sectp;
1904 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1906 else if (section_is_p (sectp->name, &names->frame))
1908 dwarf2_per_objfile->frame.asection = sectp;
1909 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1911 else if (section_is_p (sectp->name, &names->eh_frame))
1913 dwarf2_per_objfile->eh_frame.asection = sectp;
1914 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1916 else if (section_is_p (sectp->name, &names->ranges))
1918 dwarf2_per_objfile->ranges.asection = sectp;
1919 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1921 else if (section_is_p (sectp->name, &names->types))
1923 struct dwarf2_section_info type_section;
1925 memset (&type_section, 0, sizeof (type_section));
1926 type_section.asection = sectp;
1927 type_section.size = bfd_get_section_size (sectp);
1929 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1932 else if (section_is_p (sectp->name, &names->gdb_index))
1934 dwarf2_per_objfile->gdb_index.asection = sectp;
1935 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1938 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1939 && bfd_section_vma (abfd, sectp) == 0)
1940 dwarf2_per_objfile->has_section_at_zero = 1;
1943 /* A helper function that decides whether a section is empty,
1947 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1949 return info->asection == NULL || info->size == 0;
1952 /* Read the contents of the section INFO.
1953 OBJFILE is the main object file, but not necessarily the file where
1954 the section comes from. E.g., for DWO files INFO->asection->owner
1955 is the bfd of the DWO file.
1956 If the section is compressed, uncompress it before returning. */
1959 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1961 asection *sectp = info->asection;
1963 gdb_byte *buf, *retbuf;
1964 unsigned char header[4];
1968 info->buffer = NULL;
1971 if (dwarf2_section_empty_p (info))
1974 abfd = sectp->owner;
1976 /* If the section has relocations, we must read it ourselves.
1977 Otherwise we attach it to the BFD. */
1978 if ((sectp->flags & SEC_RELOC) == 0)
1980 info->buffer = gdb_bfd_map_section (sectp, &info->size);
1984 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1987 /* When debugging .o files, we may need to apply relocations; see
1988 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1989 We never compress sections in .o files, so we only need to
1990 try this when the section is not compressed. */
1991 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
1994 info->buffer = retbuf;
1998 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
1999 || bfd_bread (buf, info->size, abfd) != info->size)
2000 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
2001 bfd_get_filename (abfd));
2004 /* A helper function that returns the size of a section in a safe way.
2005 If you are positive that the section has been read before using the
2006 size, then it is safe to refer to the dwarf2_section_info object's
2007 "size" field directly. In other cases, you must call this
2008 function, because for compressed sections the size field is not set
2009 correctly until the section has been read. */
2011 static bfd_size_type
2012 dwarf2_section_size (struct objfile *objfile,
2013 struct dwarf2_section_info *info)
2016 dwarf2_read_section (objfile, info);
2020 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2024 dwarf2_get_section_info (struct objfile *objfile,
2025 enum dwarf2_section_enum sect,
2026 asection **sectp, const gdb_byte **bufp,
2027 bfd_size_type *sizep)
2029 struct dwarf2_per_objfile *data
2030 = objfile_data (objfile, dwarf2_objfile_data_key);
2031 struct dwarf2_section_info *info;
2033 /* We may see an objfile without any DWARF, in which case we just
2044 case DWARF2_DEBUG_FRAME:
2045 info = &data->frame;
2047 case DWARF2_EH_FRAME:
2048 info = &data->eh_frame;
2051 gdb_assert_not_reached ("unexpected section");
2054 dwarf2_read_section (objfile, info);
2056 *sectp = info->asection;
2057 *bufp = info->buffer;
2058 *sizep = info->size;
2061 /* A helper function to find the sections for a .dwz file. */
2064 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2066 struct dwz_file *dwz_file = arg;
2068 /* Note that we only support the standard ELF names, because .dwz
2069 is ELF-only (at the time of writing). */
2070 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2072 dwz_file->abbrev.asection = sectp;
2073 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2075 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2077 dwz_file->info.asection = sectp;
2078 dwz_file->info.size = bfd_get_section_size (sectp);
2080 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2082 dwz_file->str.asection = sectp;
2083 dwz_file->str.size = bfd_get_section_size (sectp);
2085 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2087 dwz_file->line.asection = sectp;
2088 dwz_file->line.size = bfd_get_section_size (sectp);
2090 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2092 dwz_file->macro.asection = sectp;
2093 dwz_file->macro.size = bfd_get_section_size (sectp);
2095 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2097 dwz_file->gdb_index.asection = sectp;
2098 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2102 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2103 there is no .gnu_debugaltlink section in the file. Error if there
2104 is such a section but the file cannot be found. */
2106 static struct dwz_file *
2107 dwarf2_get_dwz_file (void)
2111 struct cleanup *cleanup;
2112 const char *filename;
2113 struct dwz_file *result;
2114 unsigned long buildid;
2116 if (dwarf2_per_objfile->dwz_file != NULL)
2117 return dwarf2_per_objfile->dwz_file;
2119 bfd_set_error (bfd_error_no_error);
2120 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2124 if (bfd_get_error () == bfd_error_no_error)
2126 error (_("could not read '.gnu_debugaltlink' section: %s"),
2127 bfd_errmsg (bfd_get_error ()));
2129 cleanup = make_cleanup (xfree, data);
2131 filename = (const char *) data;
2132 if (!IS_ABSOLUTE_PATH (filename))
2134 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name);
2137 make_cleanup (xfree, abs);
2138 abs = ldirname (abs);
2139 make_cleanup (xfree, abs);
2141 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2142 make_cleanup (xfree, rel);
2146 /* The format is just a NUL-terminated file name, followed by the
2147 build-id. For now, though, we ignore the build-id. */
2148 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2149 if (dwz_bfd == NULL)
2150 error (_("could not read '%s': %s"), filename,
2151 bfd_errmsg (bfd_get_error ()));
2153 if (!bfd_check_format (dwz_bfd, bfd_object))
2155 gdb_bfd_unref (dwz_bfd);
2156 error (_("file '%s' was not usable: %s"), filename,
2157 bfd_errmsg (bfd_get_error ()));
2160 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2162 result->dwz_bfd = dwz_bfd;
2164 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2166 do_cleanups (cleanup);
2168 dwarf2_per_objfile->dwz_file = result;
2172 /* DWARF quick_symbols_functions support. */
2174 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2175 unique line tables, so we maintain a separate table of all .debug_line
2176 derived entries to support the sharing.
2177 All the quick functions need is the list of file names. We discard the
2178 line_header when we're done and don't need to record it here. */
2179 struct quick_file_names
2181 /* The data used to construct the hash key. */
2182 struct stmt_list_hash hash;
2184 /* The number of entries in file_names, real_names. */
2185 unsigned int num_file_names;
2187 /* The file names from the line table, after being run through
2189 const char **file_names;
2191 /* The file names from the line table after being run through
2192 gdb_realpath. These are computed lazily. */
2193 const char **real_names;
2196 /* When using the index (and thus not using psymtabs), each CU has an
2197 object of this type. This is used to hold information needed by
2198 the various "quick" methods. */
2199 struct dwarf2_per_cu_quick_data
2201 /* The file table. This can be NULL if there was no file table
2202 or it's currently not read in.
2203 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2204 struct quick_file_names *file_names;
2206 /* The corresponding symbol table. This is NULL if symbols for this
2207 CU have not yet been read. */
2208 struct symtab *symtab;
2210 /* A temporary mark bit used when iterating over all CUs in
2211 expand_symtabs_matching. */
2212 unsigned int mark : 1;
2214 /* True if we've tried to read the file table and found there isn't one.
2215 There will be no point in trying to read it again next time. */
2216 unsigned int no_file_data : 1;
2219 /* Utility hash function for a stmt_list_hash. */
2222 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2226 if (stmt_list_hash->dwo_unit != NULL)
2227 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2228 v += stmt_list_hash->line_offset.sect_off;
2232 /* Utility equality function for a stmt_list_hash. */
2235 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2236 const struct stmt_list_hash *rhs)
2238 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2240 if (lhs->dwo_unit != NULL
2241 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2244 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2247 /* Hash function for a quick_file_names. */
2250 hash_file_name_entry (const void *e)
2252 const struct quick_file_names *file_data = e;
2254 return hash_stmt_list_entry (&file_data->hash);
2257 /* Equality function for a quick_file_names. */
2260 eq_file_name_entry (const void *a, const void *b)
2262 const struct quick_file_names *ea = a;
2263 const struct quick_file_names *eb = b;
2265 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2268 /* Delete function for a quick_file_names. */
2271 delete_file_name_entry (void *e)
2273 struct quick_file_names *file_data = e;
2276 for (i = 0; i < file_data->num_file_names; ++i)
2278 xfree ((void*) file_data->file_names[i]);
2279 if (file_data->real_names)
2280 xfree ((void*) file_data->real_names[i]);
2283 /* The space for the struct itself lives on objfile_obstack,
2284 so we don't free it here. */
2287 /* Create a quick_file_names hash table. */
2290 create_quick_file_names_table (unsigned int nr_initial_entries)
2292 return htab_create_alloc (nr_initial_entries,
2293 hash_file_name_entry, eq_file_name_entry,
2294 delete_file_name_entry, xcalloc, xfree);
2297 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2298 have to be created afterwards. You should call age_cached_comp_units after
2299 processing PER_CU->CU. dw2_setup must have been already called. */
2302 load_cu (struct dwarf2_per_cu_data *per_cu)
2304 if (per_cu->is_debug_types)
2305 load_full_type_unit (per_cu);
2307 load_full_comp_unit (per_cu, language_minimal);
2309 gdb_assert (per_cu->cu != NULL);
2311 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2314 /* Read in the symbols for PER_CU. */
2317 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2319 struct cleanup *back_to;
2321 /* Skip type_unit_groups, reading the type units they contain
2322 is handled elsewhere. */
2323 if (IS_TYPE_UNIT_GROUP (per_cu))
2326 back_to = make_cleanup (dwarf2_release_queue, NULL);
2328 if (dwarf2_per_objfile->using_index
2329 ? per_cu->v.quick->symtab == NULL
2330 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2332 queue_comp_unit (per_cu, language_minimal);
2338 /* Age the cache, releasing compilation units that have not
2339 been used recently. */
2340 age_cached_comp_units ();
2342 do_cleanups (back_to);
2345 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2346 the objfile from which this CU came. Returns the resulting symbol
2349 static struct symtab *
2350 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2352 gdb_assert (dwarf2_per_objfile->using_index);
2353 if (!per_cu->v.quick->symtab)
2355 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2356 increment_reading_symtab ();
2357 dw2_do_instantiate_symtab (per_cu);
2358 process_cu_includes ();
2359 do_cleanups (back_to);
2361 return per_cu->v.quick->symtab;
2364 /* Return the CU given its index.
2366 This is intended for loops like:
2368 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2369 + dwarf2_per_objfile->n_type_units); ++i)
2371 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2377 static struct dwarf2_per_cu_data *
2378 dw2_get_cu (int index)
2380 if (index >= dwarf2_per_objfile->n_comp_units)
2382 index -= dwarf2_per_objfile->n_comp_units;
2383 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2384 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2387 return dwarf2_per_objfile->all_comp_units[index];
2390 /* Return the primary CU given its index.
2391 The difference between this function and dw2_get_cu is in the handling
2392 of type units (TUs). Here we return the type_unit_group object.
2394 This is intended for loops like:
2396 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2397 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2399 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2405 static struct dwarf2_per_cu_data *
2406 dw2_get_primary_cu (int index)
2408 if (index >= dwarf2_per_objfile->n_comp_units)
2410 index -= dwarf2_per_objfile->n_comp_units;
2411 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2412 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2415 return dwarf2_per_objfile->all_comp_units[index];
2418 /* A helper for create_cus_from_index that handles a given list of
2422 create_cus_from_index_list (struct objfile *objfile,
2423 const gdb_byte *cu_list, offset_type n_elements,
2424 struct dwarf2_section_info *section,
2430 for (i = 0; i < n_elements; i += 2)
2432 struct dwarf2_per_cu_data *the_cu;
2433 ULONGEST offset, length;
2435 gdb_static_assert (sizeof (ULONGEST) >= 8);
2436 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2437 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2440 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2441 struct dwarf2_per_cu_data);
2442 the_cu->offset.sect_off = offset;
2443 the_cu->length = length;
2444 the_cu->objfile = objfile;
2445 the_cu->section = section;
2446 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2447 struct dwarf2_per_cu_quick_data);
2448 the_cu->is_dwz = is_dwz;
2449 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2453 /* Read the CU list from the mapped index, and use it to create all
2454 the CU objects for this objfile. */
2457 create_cus_from_index (struct objfile *objfile,
2458 const gdb_byte *cu_list, offset_type cu_list_elements,
2459 const gdb_byte *dwz_list, offset_type dwz_elements)
2461 struct dwz_file *dwz;
2463 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2464 dwarf2_per_objfile->all_comp_units
2465 = obstack_alloc (&objfile->objfile_obstack,
2466 dwarf2_per_objfile->n_comp_units
2467 * sizeof (struct dwarf2_per_cu_data *));
2469 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2470 &dwarf2_per_objfile->info, 0, 0);
2472 if (dwz_elements == 0)
2475 dwz = dwarf2_get_dwz_file ();
2476 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2477 cu_list_elements / 2);
2480 /* Create the signatured type hash table from the index. */
2483 create_signatured_type_table_from_index (struct objfile *objfile,
2484 struct dwarf2_section_info *section,
2485 const gdb_byte *bytes,
2486 offset_type elements)
2489 htab_t sig_types_hash;
2491 dwarf2_per_objfile->n_type_units = elements / 3;
2492 dwarf2_per_objfile->all_type_units
2493 = xmalloc (dwarf2_per_objfile->n_type_units
2494 * sizeof (struct signatured_type *));
2496 sig_types_hash = allocate_signatured_type_table (objfile);
2498 for (i = 0; i < elements; i += 3)
2500 struct signatured_type *sig_type;
2501 ULONGEST offset, type_offset_in_tu, signature;
2504 gdb_static_assert (sizeof (ULONGEST) >= 8);
2505 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2506 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2508 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2511 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2512 struct signatured_type);
2513 sig_type->signature = signature;
2514 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2515 sig_type->per_cu.is_debug_types = 1;
2516 sig_type->per_cu.section = section;
2517 sig_type->per_cu.offset.sect_off = offset;
2518 sig_type->per_cu.objfile = objfile;
2519 sig_type->per_cu.v.quick
2520 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2521 struct dwarf2_per_cu_quick_data);
2523 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2526 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2529 dwarf2_per_objfile->signatured_types = sig_types_hash;
2532 /* Read the address map data from the mapped index, and use it to
2533 populate the objfile's psymtabs_addrmap. */
2536 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2538 const gdb_byte *iter, *end;
2539 struct obstack temp_obstack;
2540 struct addrmap *mutable_map;
2541 struct cleanup *cleanup;
2544 obstack_init (&temp_obstack);
2545 cleanup = make_cleanup_obstack_free (&temp_obstack);
2546 mutable_map = addrmap_create_mutable (&temp_obstack);
2548 iter = index->address_table;
2549 end = iter + index->address_table_size;
2551 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2555 ULONGEST hi, lo, cu_index;
2556 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2558 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2560 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2563 if (cu_index < dwarf2_per_objfile->n_comp_units)
2565 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2566 dw2_get_cu (cu_index));
2570 complaint (&symfile_complaints,
2571 _(".gdb_index address table has invalid CU number %u"),
2572 (unsigned) cu_index);
2576 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2577 &objfile->objfile_obstack);
2578 do_cleanups (cleanup);
2581 /* The hash function for strings in the mapped index. This is the same as
2582 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2583 implementation. This is necessary because the hash function is tied to the
2584 format of the mapped index file. The hash values do not have to match with
2587 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2590 mapped_index_string_hash (int index_version, const void *p)
2592 const unsigned char *str = (const unsigned char *) p;
2596 while ((c = *str++) != 0)
2598 if (index_version >= 5)
2600 r = r * 67 + c - 113;
2606 /* Find a slot in the mapped index INDEX for the object named NAME.
2607 If NAME is found, set *VEC_OUT to point to the CU vector in the
2608 constant pool and return 1. If NAME cannot be found, return 0. */
2611 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2612 offset_type **vec_out)
2614 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2616 offset_type slot, step;
2617 int (*cmp) (const char *, const char *);
2619 if (current_language->la_language == language_cplus
2620 || current_language->la_language == language_java
2621 || current_language->la_language == language_fortran)
2623 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2625 const char *paren = strchr (name, '(');
2631 dup = xmalloc (paren - name + 1);
2632 memcpy (dup, name, paren - name);
2633 dup[paren - name] = 0;
2635 make_cleanup (xfree, dup);
2640 /* Index version 4 did not support case insensitive searches. But the
2641 indices for case insensitive languages are built in lowercase, therefore
2642 simulate our NAME being searched is also lowercased. */
2643 hash = mapped_index_string_hash ((index->version == 4
2644 && case_sensitivity == case_sensitive_off
2645 ? 5 : index->version),
2648 slot = hash & (index->symbol_table_slots - 1);
2649 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2650 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2654 /* Convert a slot number to an offset into the table. */
2655 offset_type i = 2 * slot;
2657 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2659 do_cleanups (back_to);
2663 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2664 if (!cmp (name, str))
2666 *vec_out = (offset_type *) (index->constant_pool
2667 + MAYBE_SWAP (index->symbol_table[i + 1]));
2668 do_cleanups (back_to);
2672 slot = (slot + step) & (index->symbol_table_slots - 1);
2676 /* A helper function that reads the .gdb_index from SECTION and fills
2677 in MAP. FILENAME is the name of the file containing the section;
2678 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2679 ok to use deprecated sections.
2681 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2682 out parameters that are filled in with information about the CU and
2683 TU lists in the section.
2685 Returns 1 if all went well, 0 otherwise. */
2688 read_index_from_section (struct objfile *objfile,
2689 const char *filename,
2691 struct dwarf2_section_info *section,
2692 struct mapped_index *map,
2693 const gdb_byte **cu_list,
2694 offset_type *cu_list_elements,
2695 const gdb_byte **types_list,
2696 offset_type *types_list_elements)
2698 const gdb_byte *addr;
2699 offset_type version;
2700 offset_type *metadata;
2703 if (dwarf2_section_empty_p (section))
2706 /* Older elfutils strip versions could keep the section in the main
2707 executable while splitting it for the separate debug info file. */
2708 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2711 dwarf2_read_section (objfile, section);
2713 addr = section->buffer;
2714 /* Version check. */
2715 version = MAYBE_SWAP (*(offset_type *) addr);
2716 /* Versions earlier than 3 emitted every copy of a psymbol. This
2717 causes the index to behave very poorly for certain requests. Version 3
2718 contained incomplete addrmap. So, it seems better to just ignore such
2722 static int warning_printed = 0;
2723 if (!warning_printed)
2725 warning (_("Skipping obsolete .gdb_index section in %s."),
2727 warning_printed = 1;
2731 /* Index version 4 uses a different hash function than index version
2734 Versions earlier than 6 did not emit psymbols for inlined
2735 functions. Using these files will cause GDB not to be able to
2736 set breakpoints on inlined functions by name, so we ignore these
2737 indices unless the user has done
2738 "set use-deprecated-index-sections on". */
2739 if (version < 6 && !deprecated_ok)
2741 static int warning_printed = 0;
2742 if (!warning_printed)
2745 Skipping deprecated .gdb_index section in %s.\n\
2746 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2747 to use the section anyway."),
2749 warning_printed = 1;
2753 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2754 of the TU (for symbols coming from TUs). It's just a performance bug, and
2755 we can't distinguish gdb-generated indices from gold-generated ones, so
2756 nothing to do here. */
2758 /* Indexes with higher version than the one supported by GDB may be no
2759 longer backward compatible. */
2763 map->version = version;
2764 map->total_size = section->size;
2766 metadata = (offset_type *) (addr + sizeof (offset_type));
2769 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2770 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2774 *types_list = addr + MAYBE_SWAP (metadata[i]);
2775 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2776 - MAYBE_SWAP (metadata[i]))
2780 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2781 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2782 - MAYBE_SWAP (metadata[i]));
2785 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2786 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2787 - MAYBE_SWAP (metadata[i]))
2788 / (2 * sizeof (offset_type)));
2791 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
2797 /* Read the index file. If everything went ok, initialize the "quick"
2798 elements of all the CUs and return 1. Otherwise, return 0. */
2801 dwarf2_read_index (struct objfile *objfile)
2803 struct mapped_index local_map, *map;
2804 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2805 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2806 struct dwz_file *dwz;
2808 if (!read_index_from_section (objfile, objfile->name,
2809 use_deprecated_index_sections,
2810 &dwarf2_per_objfile->gdb_index, &local_map,
2811 &cu_list, &cu_list_elements,
2812 &types_list, &types_list_elements))
2815 /* Don't use the index if it's empty. */
2816 if (local_map.symbol_table_slots == 0)
2819 /* If there is a .dwz file, read it so we can get its CU list as
2821 dwz = dwarf2_get_dwz_file ();
2824 struct mapped_index dwz_map;
2825 const gdb_byte *dwz_types_ignore;
2826 offset_type dwz_types_elements_ignore;
2828 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2830 &dwz->gdb_index, &dwz_map,
2831 &dwz_list, &dwz_list_elements,
2833 &dwz_types_elements_ignore))
2835 warning (_("could not read '.gdb_index' section from %s; skipping"),
2836 bfd_get_filename (dwz->dwz_bfd));
2841 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2844 if (types_list_elements)
2846 struct dwarf2_section_info *section;
2848 /* We can only handle a single .debug_types when we have an
2850 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2853 section = VEC_index (dwarf2_section_info_def,
2854 dwarf2_per_objfile->types, 0);
2856 create_signatured_type_table_from_index (objfile, section, types_list,
2857 types_list_elements);
2860 create_addrmap_from_index (objfile, &local_map);
2862 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2865 dwarf2_per_objfile->index_table = map;
2866 dwarf2_per_objfile->using_index = 1;
2867 dwarf2_per_objfile->quick_file_names_table =
2868 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2873 /* A helper for the "quick" functions which sets the global
2874 dwarf2_per_objfile according to OBJFILE. */
2877 dw2_setup (struct objfile *objfile)
2879 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2880 gdb_assert (dwarf2_per_objfile);
2883 /* die_reader_func for dw2_get_file_names. */
2886 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2887 const gdb_byte *info_ptr,
2888 struct die_info *comp_unit_die,
2892 struct dwarf2_cu *cu = reader->cu;
2893 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2894 struct objfile *objfile = dwarf2_per_objfile->objfile;
2895 struct dwarf2_per_cu_data *lh_cu;
2896 struct line_header *lh;
2897 struct attribute *attr;
2899 const char *name, *comp_dir;
2901 struct quick_file_names *qfn;
2902 unsigned int line_offset;
2904 gdb_assert (! this_cu->is_debug_types);
2906 /* Our callers never want to match partial units -- instead they
2907 will match the enclosing full CU. */
2908 if (comp_unit_die->tag == DW_TAG_partial_unit)
2910 this_cu->v.quick->no_file_data = 1;
2919 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2922 struct quick_file_names find_entry;
2924 line_offset = DW_UNSND (attr);
2926 /* We may have already read in this line header (TU line header sharing).
2927 If we have we're done. */
2928 find_entry.hash.dwo_unit = cu->dwo_unit;
2929 find_entry.hash.line_offset.sect_off = line_offset;
2930 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2931 &find_entry, INSERT);
2934 lh_cu->v.quick->file_names = *slot;
2938 lh = dwarf_decode_line_header (line_offset, cu);
2942 lh_cu->v.quick->no_file_data = 1;
2946 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2947 qfn->hash.dwo_unit = cu->dwo_unit;
2948 qfn->hash.line_offset.sect_off = line_offset;
2949 gdb_assert (slot != NULL);
2952 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2954 qfn->num_file_names = lh->num_file_names;
2955 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2956 lh->num_file_names * sizeof (char *));
2957 for (i = 0; i < lh->num_file_names; ++i)
2958 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2959 qfn->real_names = NULL;
2961 free_line_header (lh);
2963 lh_cu->v.quick->file_names = qfn;
2966 /* A helper for the "quick" functions which attempts to read the line
2967 table for THIS_CU. */
2969 static struct quick_file_names *
2970 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
2972 /* This should never be called for TUs. */
2973 gdb_assert (! this_cu->is_debug_types);
2974 /* Nor type unit groups. */
2975 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
2977 if (this_cu->v.quick->file_names != NULL)
2978 return this_cu->v.quick->file_names;
2979 /* If we know there is no line data, no point in looking again. */
2980 if (this_cu->v.quick->no_file_data)
2983 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
2985 if (this_cu->v.quick->no_file_data)
2987 return this_cu->v.quick->file_names;
2990 /* A helper for the "quick" functions which computes and caches the
2991 real path for a given file name from the line table. */
2994 dw2_get_real_path (struct objfile *objfile,
2995 struct quick_file_names *qfn, int index)
2997 if (qfn->real_names == NULL)
2998 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
2999 qfn->num_file_names, sizeof (char *));
3001 if (qfn->real_names[index] == NULL)
3002 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3004 return qfn->real_names[index];
3007 static struct symtab *
3008 dw2_find_last_source_symtab (struct objfile *objfile)
3012 dw2_setup (objfile);
3013 index = dwarf2_per_objfile->n_comp_units - 1;
3014 return dw2_instantiate_symtab (dw2_get_cu (index));
3017 /* Traversal function for dw2_forget_cached_source_info. */
3020 dw2_free_cached_file_names (void **slot, void *info)
3022 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3024 if (file_data->real_names)
3028 for (i = 0; i < file_data->num_file_names; ++i)
3030 xfree ((void*) file_data->real_names[i]);
3031 file_data->real_names[i] = NULL;
3039 dw2_forget_cached_source_info (struct objfile *objfile)
3041 dw2_setup (objfile);
3043 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3044 dw2_free_cached_file_names, NULL);
3047 /* Helper function for dw2_map_symtabs_matching_filename that expands
3048 the symtabs and calls the iterator. */
3051 dw2_map_expand_apply (struct objfile *objfile,
3052 struct dwarf2_per_cu_data *per_cu,
3053 const char *name, const char *real_path,
3054 int (*callback) (struct symtab *, void *),
3057 struct symtab *last_made = objfile->symtabs;
3059 /* Don't visit already-expanded CUs. */
3060 if (per_cu->v.quick->symtab)
3063 /* This may expand more than one symtab, and we want to iterate over
3065 dw2_instantiate_symtab (per_cu);
3067 return iterate_over_some_symtabs (name, real_path, callback, data,
3068 objfile->symtabs, last_made);
3071 /* Implementation of the map_symtabs_matching_filename method. */
3074 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3075 const char *real_path,
3076 int (*callback) (struct symtab *, void *),
3080 const char *name_basename = lbasename (name);
3082 dw2_setup (objfile);
3084 /* The rule is CUs specify all the files, including those used by
3085 any TU, so there's no need to scan TUs here. */
3087 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3090 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3091 struct quick_file_names *file_data;
3093 /* We only need to look at symtabs not already expanded. */
3094 if (per_cu->v.quick->symtab)
3097 file_data = dw2_get_file_names (per_cu);
3098 if (file_data == NULL)
3101 for (j = 0; j < file_data->num_file_names; ++j)
3103 const char *this_name = file_data->file_names[j];
3104 const char *this_real_name;
3106 if (compare_filenames_for_search (this_name, name))
3108 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3114 /* Before we invoke realpath, which can get expensive when many
3115 files are involved, do a quick comparison of the basenames. */
3116 if (! basenames_may_differ
3117 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3120 this_real_name = dw2_get_real_path (objfile, file_data, j);
3121 if (compare_filenames_for_search (this_real_name, name))
3123 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3129 if (real_path != NULL)
3131 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3132 gdb_assert (IS_ABSOLUTE_PATH (name));
3133 if (this_real_name != NULL
3134 && FILENAME_CMP (real_path, this_real_name) == 0)
3136 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3148 /* Struct used to manage iterating over all CUs looking for a symbol. */
3150 struct dw2_symtab_iterator
3152 /* The internalized form of .gdb_index. */
3153 struct mapped_index *index;
3154 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3155 int want_specific_block;
3156 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3157 Unused if !WANT_SPECIFIC_BLOCK. */
3159 /* The kind of symbol we're looking for. */
3161 /* The list of CUs from the index entry of the symbol,
3162 or NULL if not found. */
3164 /* The next element in VEC to look at. */
3166 /* The number of elements in VEC, or zero if there is no match. */
3170 /* Initialize the index symtab iterator ITER.
3171 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3172 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3175 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3176 struct mapped_index *index,
3177 int want_specific_block,
3182 iter->index = index;
3183 iter->want_specific_block = want_specific_block;
3184 iter->block_index = block_index;
3185 iter->domain = domain;
3188 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3189 iter->length = MAYBE_SWAP (*iter->vec);
3197 /* Return the next matching CU or NULL if there are no more. */
3199 static struct dwarf2_per_cu_data *
3200 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3202 for ( ; iter->next < iter->length; ++iter->next)
3204 offset_type cu_index_and_attrs =
3205 MAYBE_SWAP (iter->vec[iter->next + 1]);
3206 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3207 struct dwarf2_per_cu_data *per_cu;
3208 int want_static = iter->block_index != GLOBAL_BLOCK;
3209 /* This value is only valid for index versions >= 7. */
3210 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3211 gdb_index_symbol_kind symbol_kind =
3212 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3213 /* Only check the symbol attributes if they're present.
3214 Indices prior to version 7 don't record them,
3215 and indices >= 7 may elide them for certain symbols
3216 (gold does this). */
3218 (iter->index->version >= 7
3219 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3221 /* Don't crash on bad data. */
3222 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3223 + dwarf2_per_objfile->n_type_units))
3225 complaint (&symfile_complaints,
3226 _(".gdb_index entry has bad CU index"
3227 " [in module %s]"), dwarf2_per_objfile->objfile->name);
3231 per_cu = dw2_get_cu (cu_index);
3233 /* Skip if already read in. */
3234 if (per_cu->v.quick->symtab)
3238 && iter->want_specific_block
3239 && want_static != is_static)
3242 /* Only check the symbol's kind if it has one. */
3245 switch (iter->domain)
3248 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3249 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3250 /* Some types are also in VAR_DOMAIN. */
3251 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3255 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3259 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3274 static struct symtab *
3275 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3276 const char *name, domain_enum domain)
3278 struct symtab *stab_best = NULL;
3279 struct mapped_index *index;
3281 dw2_setup (objfile);
3283 index = dwarf2_per_objfile->index_table;
3285 /* index is NULL if OBJF_READNOW. */
3288 struct dw2_symtab_iterator iter;
3289 struct dwarf2_per_cu_data *per_cu;
3291 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3293 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3295 struct symbol *sym = NULL;
3296 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3298 /* Some caution must be observed with overloaded functions
3299 and methods, since the index will not contain any overload
3300 information (but NAME might contain it). */
3303 struct blockvector *bv = BLOCKVECTOR (stab);
3304 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3306 sym = lookup_block_symbol (block, name, domain);
3309 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3311 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3317 /* Keep looking through other CUs. */
3325 dw2_print_stats (struct objfile *objfile)
3327 int i, total, count;
3329 dw2_setup (objfile);
3330 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3332 for (i = 0; i < total; ++i)
3334 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3336 if (!per_cu->v.quick->symtab)
3339 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3340 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3344 dw2_dump (struct objfile *objfile)
3346 /* Nothing worth printing. */
3350 dw2_relocate (struct objfile *objfile,
3351 const struct section_offsets *new_offsets,
3352 const struct section_offsets *delta)
3354 /* There's nothing to relocate here. */
3358 dw2_expand_symtabs_for_function (struct objfile *objfile,
3359 const char *func_name)
3361 struct mapped_index *index;
3363 dw2_setup (objfile);
3365 index = dwarf2_per_objfile->index_table;
3367 /* index is NULL if OBJF_READNOW. */
3370 struct dw2_symtab_iterator iter;
3371 struct dwarf2_per_cu_data *per_cu;
3373 /* Note: It doesn't matter what we pass for block_index here. */
3374 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3377 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3378 dw2_instantiate_symtab (per_cu);
3383 dw2_expand_all_symtabs (struct objfile *objfile)
3387 dw2_setup (objfile);
3389 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3390 + dwarf2_per_objfile->n_type_units); ++i)
3392 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3394 dw2_instantiate_symtab (per_cu);
3399 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3400 const char *fullname)
3404 dw2_setup (objfile);
3406 /* We don't need to consider type units here.
3407 This is only called for examining code, e.g. expand_line_sal.
3408 There can be an order of magnitude (or more) more type units
3409 than comp units, and we avoid them if we can. */
3411 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3414 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3415 struct quick_file_names *file_data;
3417 /* We only need to look at symtabs not already expanded. */
3418 if (per_cu->v.quick->symtab)
3421 file_data = dw2_get_file_names (per_cu);
3422 if (file_data == NULL)
3425 for (j = 0; j < file_data->num_file_names; ++j)
3427 const char *this_fullname = file_data->file_names[j];
3429 if (filename_cmp (this_fullname, fullname) == 0)
3431 dw2_instantiate_symtab (per_cu);
3438 /* A helper function for dw2_find_symbol_file that finds the primary
3439 file name for a given CU. This is a die_reader_func. */
3442 dw2_get_primary_filename_reader (const struct die_reader_specs *reader,
3443 const gdb_byte *info_ptr,
3444 struct die_info *comp_unit_die,
3448 const char **result_ptr = data;
3449 struct dwarf2_cu *cu = reader->cu;
3450 struct attribute *attr;
3452 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
3456 *result_ptr = DW_STRING (attr);
3460 dw2_find_symbol_file (struct objfile *objfile, const char *name)
3462 struct dwarf2_per_cu_data *per_cu;
3464 const char *filename;
3466 dw2_setup (objfile);
3468 /* index_table is NULL if OBJF_READNOW. */
3469 if (!dwarf2_per_objfile->index_table)
3473 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
3475 struct blockvector *bv = BLOCKVECTOR (s);
3476 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
3477 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN);
3481 /* Only file extension of returned filename is recognized. */
3482 return SYMBOL_SYMTAB (sym)->filename;
3488 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table,
3492 /* Note that this just looks at the very first one named NAME -- but
3493 actually we are looking for a function. find_main_filename
3494 should be rewritten so that it doesn't require a custom hook. It
3495 could just use the ordinary symbol tables. */
3496 /* vec[0] is the length, which must always be >0. */
3497 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1])));
3499 if (per_cu->v.quick->symtab != NULL)
3501 /* Only file extension of returned filename is recognized. */
3502 return per_cu->v.quick->symtab->filename;
3505 /* Initialize filename in case there's a problem reading the DWARF,
3506 dw2_get_primary_filename_reader may not get called. */
3508 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
3509 dw2_get_primary_filename_reader, &filename);
3511 /* Only file extension of returned filename is recognized. */
3516 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3517 struct objfile *objfile, int global,
3518 int (*callback) (struct block *,
3519 struct symbol *, void *),
3520 void *data, symbol_compare_ftype *match,
3521 symbol_compare_ftype *ordered_compare)
3523 /* Currently unimplemented; used for Ada. The function can be called if the
3524 current language is Ada for a non-Ada objfile using GNU index. As Ada
3525 does not look for non-Ada symbols this function should just return. */
3529 dw2_expand_symtabs_matching
3530 (struct objfile *objfile,
3531 int (*file_matcher) (const char *, void *, int basenames),
3532 int (*name_matcher) (const char *, void *),
3533 enum search_domain kind,
3538 struct mapped_index *index;
3540 dw2_setup (objfile);
3542 /* index_table is NULL if OBJF_READNOW. */
3543 if (!dwarf2_per_objfile->index_table)
3545 index = dwarf2_per_objfile->index_table;
3547 if (file_matcher != NULL)
3549 struct cleanup *cleanup;
3550 htab_t visited_found, visited_not_found;
3552 visited_found = htab_create_alloc (10,
3553 htab_hash_pointer, htab_eq_pointer,
3554 NULL, xcalloc, xfree);
3555 cleanup = make_cleanup_htab_delete (visited_found);
3556 visited_not_found = htab_create_alloc (10,
3557 htab_hash_pointer, htab_eq_pointer,
3558 NULL, xcalloc, xfree);
3559 make_cleanup_htab_delete (visited_not_found);
3561 /* The rule is CUs specify all the files, including those used by
3562 any TU, so there's no need to scan TUs here. */
3564 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3567 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3568 struct quick_file_names *file_data;
3571 per_cu->v.quick->mark = 0;
3573 /* We only need to look at symtabs not already expanded. */
3574 if (per_cu->v.quick->symtab)
3577 file_data = dw2_get_file_names (per_cu);
3578 if (file_data == NULL)
3581 if (htab_find (visited_not_found, file_data) != NULL)
3583 else if (htab_find (visited_found, file_data) != NULL)
3585 per_cu->v.quick->mark = 1;
3589 for (j = 0; j < file_data->num_file_names; ++j)
3591 const char *this_real_name;
3593 if (file_matcher (file_data->file_names[j], data, 0))
3595 per_cu->v.quick->mark = 1;
3599 /* Before we invoke realpath, which can get expensive when many
3600 files are involved, do a quick comparison of the basenames. */
3601 if (!basenames_may_differ
3602 && !file_matcher (lbasename (file_data->file_names[j]),
3606 this_real_name = dw2_get_real_path (objfile, file_data, j);
3607 if (file_matcher (this_real_name, data, 0))
3609 per_cu->v.quick->mark = 1;
3614 slot = htab_find_slot (per_cu->v.quick->mark
3616 : visited_not_found,
3621 do_cleanups (cleanup);
3624 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3626 offset_type idx = 2 * iter;
3628 offset_type *vec, vec_len, vec_idx;
3630 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3633 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3635 if (! (*name_matcher) (name, data))
3638 /* The name was matched, now expand corresponding CUs that were
3640 vec = (offset_type *) (index->constant_pool
3641 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3642 vec_len = MAYBE_SWAP (vec[0]);
3643 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3645 struct dwarf2_per_cu_data *per_cu;
3646 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3647 gdb_index_symbol_kind symbol_kind =
3648 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3649 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3650 /* Only check the symbol attributes if they're present.
3651 Indices prior to version 7 don't record them,
3652 and indices >= 7 may elide them for certain symbols
3653 (gold does this). */
3655 (index->version >= 7
3656 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3658 /* Only check the symbol's kind if it has one. */
3663 case VARIABLES_DOMAIN:
3664 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3667 case FUNCTIONS_DOMAIN:
3668 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3672 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3680 /* Don't crash on bad data. */
3681 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3682 + dwarf2_per_objfile->n_type_units))
3684 complaint (&symfile_complaints,
3685 _(".gdb_index entry has bad CU index"
3686 " [in module %s]"), objfile->name);
3690 per_cu = dw2_get_cu (cu_index);
3691 if (file_matcher == NULL || per_cu->v.quick->mark)
3692 dw2_instantiate_symtab (per_cu);
3697 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3700 static struct symtab *
3701 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3705 if (BLOCKVECTOR (symtab) != NULL
3706 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3709 if (symtab->includes == NULL)
3712 for (i = 0; symtab->includes[i]; ++i)
3714 struct symtab *s = symtab->includes[i];
3716 s = recursively_find_pc_sect_symtab (s, pc);
3724 static struct symtab *
3725 dw2_find_pc_sect_symtab (struct objfile *objfile,
3726 struct minimal_symbol *msymbol,
3728 struct obj_section *section,
3731 struct dwarf2_per_cu_data *data;
3732 struct symtab *result;
3734 dw2_setup (objfile);
3736 if (!objfile->psymtabs_addrmap)
3739 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3743 if (warn_if_readin && data->v.quick->symtab)
3744 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3745 paddress (get_objfile_arch (objfile), pc));
3747 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3748 gdb_assert (result != NULL);
3753 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3754 void *data, int need_fullname)
3757 struct cleanup *cleanup;
3758 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3759 NULL, xcalloc, xfree);
3761 cleanup = make_cleanup_htab_delete (visited);
3762 dw2_setup (objfile);
3764 /* The rule is CUs specify all the files, including those used by
3765 any TU, so there's no need to scan TUs here.
3766 We can ignore file names coming from already-expanded CUs. */
3768 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3770 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3772 if (per_cu->v.quick->symtab)
3774 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3777 *slot = per_cu->v.quick->file_names;
3781 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3784 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3785 struct quick_file_names *file_data;
3788 /* We only need to look at symtabs not already expanded. */
3789 if (per_cu->v.quick->symtab)
3792 file_data = dw2_get_file_names (per_cu);
3793 if (file_data == NULL)
3796 slot = htab_find_slot (visited, file_data, INSERT);
3799 /* Already visited. */
3804 for (j = 0; j < file_data->num_file_names; ++j)
3806 const char *this_real_name;
3809 this_real_name = dw2_get_real_path (objfile, file_data, j);
3811 this_real_name = NULL;
3812 (*fun) (file_data->file_names[j], this_real_name, data);
3816 do_cleanups (cleanup);
3820 dw2_has_symbols (struct objfile *objfile)
3825 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3828 dw2_find_last_source_symtab,
3829 dw2_forget_cached_source_info,
3830 dw2_map_symtabs_matching_filename,
3835 dw2_expand_symtabs_for_function,
3836 dw2_expand_all_symtabs,
3837 dw2_expand_symtabs_with_fullname,
3838 dw2_find_symbol_file,
3839 dw2_map_matching_symbols,
3840 dw2_expand_symtabs_matching,
3841 dw2_find_pc_sect_symtab,
3842 dw2_map_symbol_filenames
3845 /* Initialize for reading DWARF for this objfile. Return 0 if this
3846 file will use psymtabs, or 1 if using the GNU index. */
3849 dwarf2_initialize_objfile (struct objfile *objfile)
3851 /* If we're about to read full symbols, don't bother with the
3852 indices. In this case we also don't care if some other debug
3853 format is making psymtabs, because they are all about to be
3855 if ((objfile->flags & OBJF_READNOW))
3859 dwarf2_per_objfile->using_index = 1;
3860 create_all_comp_units (objfile);
3861 create_all_type_units (objfile);
3862 dwarf2_per_objfile->quick_file_names_table =
3863 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3865 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3866 + dwarf2_per_objfile->n_type_units); ++i)
3868 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3870 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3871 struct dwarf2_per_cu_quick_data);
3874 /* Return 1 so that gdb sees the "quick" functions. However,
3875 these functions will be no-ops because we will have expanded
3880 if (dwarf2_read_index (objfile))
3888 /* Build a partial symbol table. */
3891 dwarf2_build_psymtabs (struct objfile *objfile)
3893 volatile struct gdb_exception except;
3895 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3897 init_psymbol_list (objfile, 1024);
3900 TRY_CATCH (except, RETURN_MASK_ERROR)
3902 /* This isn't really ideal: all the data we allocate on the
3903 objfile's obstack is still uselessly kept around. However,
3904 freeing it seems unsafe. */
3905 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3907 dwarf2_build_psymtabs_hard (objfile);
3908 discard_cleanups (cleanups);
3910 if (except.reason < 0)
3911 exception_print (gdb_stderr, except);
3914 /* Return the total length of the CU described by HEADER. */
3917 get_cu_length (const struct comp_unit_head *header)
3919 return header->initial_length_size + header->length;
3922 /* Return TRUE if OFFSET is within CU_HEADER. */
3925 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3927 sect_offset bottom = { cu_header->offset.sect_off };
3928 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3930 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3933 /* Find the base address of the compilation unit for range lists and
3934 location lists. It will normally be specified by DW_AT_low_pc.
3935 In DWARF-3 draft 4, the base address could be overridden by
3936 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3937 compilation units with discontinuous ranges. */
3940 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3942 struct attribute *attr;
3945 cu->base_address = 0;
3947 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3950 cu->base_address = DW_ADDR (attr);
3955 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3958 cu->base_address = DW_ADDR (attr);
3964 /* Read in the comp unit header information from the debug_info at info_ptr.
3965 NOTE: This leaves members offset, first_die_offset to be filled in
3968 static const gdb_byte *
3969 read_comp_unit_head (struct comp_unit_head *cu_header,
3970 const gdb_byte *info_ptr, bfd *abfd)
3973 unsigned int bytes_read;
3975 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3976 cu_header->initial_length_size = bytes_read;
3977 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3978 info_ptr += bytes_read;
3979 cu_header->version = read_2_bytes (abfd, info_ptr);
3981 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3983 info_ptr += bytes_read;
3984 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3986 signed_addr = bfd_get_sign_extend_vma (abfd);
3987 if (signed_addr < 0)
3988 internal_error (__FILE__, __LINE__,
3989 _("read_comp_unit_head: dwarf from non elf file"));
3990 cu_header->signed_addr_p = signed_addr;
3995 /* Helper function that returns the proper abbrev section for
3998 static struct dwarf2_section_info *
3999 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4001 struct dwarf2_section_info *abbrev;
4003 if (this_cu->is_dwz)
4004 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4006 abbrev = &dwarf2_per_objfile->abbrev;
4011 /* Subroutine of read_and_check_comp_unit_head and
4012 read_and_check_type_unit_head to simplify them.
4013 Perform various error checking on the header. */
4016 error_check_comp_unit_head (struct comp_unit_head *header,
4017 struct dwarf2_section_info *section,
4018 struct dwarf2_section_info *abbrev_section)
4020 bfd *abfd = section->asection->owner;
4021 const char *filename = bfd_get_filename (abfd);
4023 if (header->version != 2 && header->version != 3 && header->version != 4)
4024 error (_("Dwarf Error: wrong version in compilation unit header "
4025 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
4028 if (header->abbrev_offset.sect_off
4029 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4030 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
4031 "(offset 0x%lx + 6) [in module %s]"),
4032 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
4035 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4036 avoid potential 32-bit overflow. */
4037 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4039 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4040 "(offset 0x%lx + 0) [in module %s]"),
4041 (long) header->length, (long) header->offset.sect_off,
4045 /* Read in a CU/TU header and perform some basic error checking.
4046 The contents of the header are stored in HEADER.
4047 The result is a pointer to the start of the first DIE. */
4049 static const gdb_byte *
4050 read_and_check_comp_unit_head (struct comp_unit_head *header,
4051 struct dwarf2_section_info *section,
4052 struct dwarf2_section_info *abbrev_section,
4053 const gdb_byte *info_ptr,
4054 int is_debug_types_section)
4056 const gdb_byte *beg_of_comp_unit = info_ptr;
4057 bfd *abfd = section->asection->owner;
4059 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4061 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4063 /* If we're reading a type unit, skip over the signature and
4064 type_offset fields. */
4065 if (is_debug_types_section)
4066 info_ptr += 8 /*signature*/ + header->offset_size;
4068 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4070 error_check_comp_unit_head (header, section, abbrev_section);
4075 /* Read in the types comp unit header information from .debug_types entry at
4076 types_ptr. The result is a pointer to one past the end of the header. */
4078 static const gdb_byte *
4079 read_and_check_type_unit_head (struct comp_unit_head *header,
4080 struct dwarf2_section_info *section,
4081 struct dwarf2_section_info *abbrev_section,
4082 const gdb_byte *info_ptr,
4083 ULONGEST *signature,
4084 cu_offset *type_offset_in_tu)
4086 const gdb_byte *beg_of_comp_unit = info_ptr;
4087 bfd *abfd = section->asection->owner;
4089 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4091 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4093 /* If we're reading a type unit, skip over the signature and
4094 type_offset fields. */
4095 if (signature != NULL)
4096 *signature = read_8_bytes (abfd, info_ptr);
4098 if (type_offset_in_tu != NULL)
4099 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4100 header->offset_size);
4101 info_ptr += header->offset_size;
4103 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4105 error_check_comp_unit_head (header, section, abbrev_section);
4110 /* Fetch the abbreviation table offset from a comp or type unit header. */
4113 read_abbrev_offset (struct dwarf2_section_info *section,
4116 bfd *abfd = section->asection->owner;
4117 const gdb_byte *info_ptr;
4118 unsigned int length, initial_length_size, offset_size;
4119 sect_offset abbrev_offset;
4121 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4122 info_ptr = section->buffer + offset.sect_off;
4123 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4124 offset_size = initial_length_size == 4 ? 4 : 8;
4125 info_ptr += initial_length_size + 2 /*version*/;
4126 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4127 return abbrev_offset;
4130 /* Allocate a new partial symtab for file named NAME and mark this new
4131 partial symtab as being an include of PST. */
4134 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4135 struct objfile *objfile)
4137 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4139 if (!IS_ABSOLUTE_PATH (subpst->filename))
4141 /* It shares objfile->objfile_obstack. */
4142 subpst->dirname = pst->dirname;
4145 subpst->section_offsets = pst->section_offsets;
4146 subpst->textlow = 0;
4147 subpst->texthigh = 0;
4149 subpst->dependencies = (struct partial_symtab **)
4150 obstack_alloc (&objfile->objfile_obstack,
4151 sizeof (struct partial_symtab *));
4152 subpst->dependencies[0] = pst;
4153 subpst->number_of_dependencies = 1;
4155 subpst->globals_offset = 0;
4156 subpst->n_global_syms = 0;
4157 subpst->statics_offset = 0;
4158 subpst->n_static_syms = 0;
4159 subpst->symtab = NULL;
4160 subpst->read_symtab = pst->read_symtab;
4163 /* No private part is necessary for include psymtabs. This property
4164 can be used to differentiate between such include psymtabs and
4165 the regular ones. */
4166 subpst->read_symtab_private = NULL;
4169 /* Read the Line Number Program data and extract the list of files
4170 included by the source file represented by PST. Build an include
4171 partial symtab for each of these included files. */
4174 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4175 struct die_info *die,
4176 struct partial_symtab *pst)
4178 struct line_header *lh = NULL;
4179 struct attribute *attr;
4181 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4183 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4185 return; /* No linetable, so no includes. */
4187 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4188 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4190 free_line_header (lh);
4194 hash_signatured_type (const void *item)
4196 const struct signatured_type *sig_type = item;
4198 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4199 return sig_type->signature;
4203 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4205 const struct signatured_type *lhs = item_lhs;
4206 const struct signatured_type *rhs = item_rhs;
4208 return lhs->signature == rhs->signature;
4211 /* Allocate a hash table for signatured types. */
4214 allocate_signatured_type_table (struct objfile *objfile)
4216 return htab_create_alloc_ex (41,
4217 hash_signatured_type,
4220 &objfile->objfile_obstack,
4221 hashtab_obstack_allocate,
4222 dummy_obstack_deallocate);
4225 /* A helper function to add a signatured type CU to a table. */
4228 add_signatured_type_cu_to_table (void **slot, void *datum)
4230 struct signatured_type *sigt = *slot;
4231 struct signatured_type ***datap = datum;
4239 /* Create the hash table of all entries in the .debug_types
4240 (or .debug_types.dwo) section(s).
4241 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4242 otherwise it is NULL.
4244 The result is a pointer to the hash table or NULL if there are no types.
4246 Note: This function processes DWO files only, not DWP files. */
4249 create_debug_types_hash_table (struct dwo_file *dwo_file,
4250 VEC (dwarf2_section_info_def) *types)
4252 struct objfile *objfile = dwarf2_per_objfile->objfile;
4253 htab_t types_htab = NULL;
4255 struct dwarf2_section_info *section;
4256 struct dwarf2_section_info *abbrev_section;
4258 if (VEC_empty (dwarf2_section_info_def, types))
4261 abbrev_section = (dwo_file != NULL
4262 ? &dwo_file->sections.abbrev
4263 : &dwarf2_per_objfile->abbrev);
4265 if (dwarf2_read_debug)
4266 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4267 dwo_file ? ".dwo" : "",
4268 bfd_get_filename (abbrev_section->asection->owner));
4271 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4275 const gdb_byte *info_ptr, *end_ptr;
4276 struct dwarf2_section_info *abbrev_section;
4278 dwarf2_read_section (objfile, section);
4279 info_ptr = section->buffer;
4281 if (info_ptr == NULL)
4284 /* We can't set abfd until now because the section may be empty or
4285 not present, in which case section->asection will be NULL. */
4286 abfd = section->asection->owner;
4289 abbrev_section = &dwo_file->sections.abbrev;
4291 abbrev_section = &dwarf2_per_objfile->abbrev;
4293 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4294 because we don't need to read any dies: the signature is in the
4297 end_ptr = info_ptr + section->size;
4298 while (info_ptr < end_ptr)
4301 cu_offset type_offset_in_tu;
4303 struct signatured_type *sig_type;
4304 struct dwo_unit *dwo_tu;
4306 const gdb_byte *ptr = info_ptr;
4307 struct comp_unit_head header;
4308 unsigned int length;
4310 offset.sect_off = ptr - section->buffer;
4312 /* We need to read the type's signature in order to build the hash
4313 table, but we don't need anything else just yet. */
4315 ptr = read_and_check_type_unit_head (&header, section,
4316 abbrev_section, ptr,
4317 &signature, &type_offset_in_tu);
4319 length = get_cu_length (&header);
4321 /* Skip dummy type units. */
4322 if (ptr >= info_ptr + length
4323 || peek_abbrev_code (abfd, ptr) == 0)
4329 if (types_htab == NULL)
4332 types_htab = allocate_dwo_unit_table (objfile);
4334 types_htab = allocate_signatured_type_table (objfile);
4340 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4342 dwo_tu->dwo_file = dwo_file;
4343 dwo_tu->signature = signature;
4344 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4345 dwo_tu->section = section;
4346 dwo_tu->offset = offset;
4347 dwo_tu->length = length;
4351 /* N.B.: type_offset is not usable if this type uses a DWO file.
4352 The real type_offset is in the DWO file. */
4354 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4355 struct signatured_type);
4356 sig_type->signature = signature;
4357 sig_type->type_offset_in_tu = type_offset_in_tu;
4358 sig_type->per_cu.objfile = objfile;
4359 sig_type->per_cu.is_debug_types = 1;
4360 sig_type->per_cu.section = section;
4361 sig_type->per_cu.offset = offset;
4362 sig_type->per_cu.length = length;
4365 slot = htab_find_slot (types_htab,
4366 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4368 gdb_assert (slot != NULL);
4371 sect_offset dup_offset;
4375 const struct dwo_unit *dup_tu = *slot;
4377 dup_offset = dup_tu->offset;
4381 const struct signatured_type *dup_tu = *slot;
4383 dup_offset = dup_tu->per_cu.offset;
4386 complaint (&symfile_complaints,
4387 _("debug type entry at offset 0x%x is duplicate to"
4388 " the entry at offset 0x%x, signature %s"),
4389 offset.sect_off, dup_offset.sect_off,
4390 hex_string (signature));
4392 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4394 if (dwarf2_read_debug)
4395 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4397 hex_string (signature));
4406 /* Create the hash table of all entries in the .debug_types section,
4407 and initialize all_type_units.
4408 The result is zero if there is an error (e.g. missing .debug_types section),
4409 otherwise non-zero. */
4412 create_all_type_units (struct objfile *objfile)
4415 struct signatured_type **iter;
4417 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4418 if (types_htab == NULL)
4420 dwarf2_per_objfile->signatured_types = NULL;
4424 dwarf2_per_objfile->signatured_types = types_htab;
4426 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4427 dwarf2_per_objfile->all_type_units
4428 = xmalloc (dwarf2_per_objfile->n_type_units
4429 * sizeof (struct signatured_type *));
4430 iter = &dwarf2_per_objfile->all_type_units[0];
4431 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4432 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4433 == dwarf2_per_objfile->n_type_units);
4438 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4439 Fill in SIG_ENTRY with DWO_ENTRY. */
4442 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4443 struct signatured_type *sig_entry,
4444 struct dwo_unit *dwo_entry)
4446 sig_entry->per_cu.section = dwo_entry->section;
4447 sig_entry->per_cu.offset = dwo_entry->offset;
4448 sig_entry->per_cu.length = dwo_entry->length;
4449 sig_entry->per_cu.reading_dwo_directly = 1;
4450 sig_entry->per_cu.objfile = objfile;
4451 gdb_assert (! sig_entry->per_cu.queued);
4452 gdb_assert (sig_entry->per_cu.cu == NULL);
4453 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4454 gdb_assert (sig_entry->per_cu.v.quick->symtab == NULL);
4455 gdb_assert (sig_entry->signature == dwo_entry->signature);
4456 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4457 gdb_assert (sig_entry->type_unit_group == NULL);
4458 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4459 sig_entry->dwo_unit = dwo_entry;
4462 /* Subroutine of lookup_signatured_type.
4463 Create the signatured_type data structure for a TU to be read in
4464 directly from a DWO file, bypassing the stub.
4465 We do this for the case where there is no DWP file and we're using
4466 .gdb_index: When reading a CU we want to stay in the DWO file containing
4467 that CU. Otherwise we could end up reading several other DWO files (due
4468 to comdat folding) to process the transitive closure of all the mentioned
4469 TUs, and that can be slow. The current DWO file will have every type
4470 signature that it needs.
4471 We only do this for .gdb_index because in the psymtab case we already have
4472 to read all the DWOs to build the type unit groups. */
4474 static struct signatured_type *
4475 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4477 struct objfile *objfile = dwarf2_per_objfile->objfile;
4478 struct dwo_file *dwo_file;
4479 struct dwo_unit find_dwo_entry, *dwo_entry;
4480 struct signatured_type find_sig_entry, *sig_entry;
4482 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4484 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4485 dwo_unit of the TU itself. */
4486 dwo_file = cu->dwo_unit->dwo_file;
4488 /* We only ever need to read in one copy of a signatured type.
4489 Just use the global signatured_types array. If this is the first time
4490 we're reading this type, replace the recorded data from .gdb_index with
4493 if (dwarf2_per_objfile->signatured_types == NULL)
4495 find_sig_entry.signature = sig;
4496 sig_entry = htab_find (dwarf2_per_objfile->signatured_types, &find_sig_entry);
4497 if (sig_entry == NULL)
4499 /* Have we already tried to read this TU? */
4500 if (sig_entry->dwo_unit != NULL)
4503 /* Ok, this is the first time we're reading this TU. */
4504 if (dwo_file->tus == NULL)
4506 find_dwo_entry.signature = sig;
4507 dwo_entry = htab_find (dwo_file->tus, &find_dwo_entry);
4508 if (dwo_entry == NULL)
4511 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4515 /* Subroutine of lookup_dwp_signatured_type.
4516 Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. */
4518 static struct signatured_type *
4519 add_type_unit (ULONGEST sig)
4521 struct objfile *objfile = dwarf2_per_objfile->objfile;
4522 int n_type_units = dwarf2_per_objfile->n_type_units;
4523 struct signatured_type *sig_type;
4527 dwarf2_per_objfile->all_type_units =
4528 xrealloc (dwarf2_per_objfile->all_type_units,
4529 n_type_units * sizeof (struct signatured_type *));
4530 dwarf2_per_objfile->n_type_units = n_type_units;
4531 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4532 struct signatured_type);
4533 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4534 sig_type->signature = sig;
4535 sig_type->per_cu.is_debug_types = 1;
4536 sig_type->per_cu.v.quick =
4537 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4538 struct dwarf2_per_cu_quick_data);
4539 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4541 gdb_assert (*slot == NULL);
4543 /* The rest of sig_type must be filled in by the caller. */
4547 /* Subroutine of lookup_signatured_type.
4548 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4549 then try the DWP file.
4550 Normally this "can't happen", but if there's a bug in signature
4551 generation and/or the DWP file is built incorrectly, it can happen.
4552 Using the type directly from the DWP file means we don't have the stub
4553 which has some useful attributes (e.g., DW_AT_comp_dir), but they're
4554 not critical. [Eventually the stub may go away for type units anyway.] */
4556 static struct signatured_type *
4557 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4559 struct objfile *objfile = dwarf2_per_objfile->objfile;
4560 struct dwp_file *dwp_file = get_dwp_file ();
4561 struct dwo_unit *dwo_entry;
4562 struct signatured_type find_sig_entry, *sig_entry;
4564 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4565 gdb_assert (dwp_file != NULL);
4567 if (dwarf2_per_objfile->signatured_types != NULL)
4569 find_sig_entry.signature = sig;
4570 sig_entry = htab_find (dwarf2_per_objfile->signatured_types,
4572 if (sig_entry != NULL)
4576 /* This is the "shouldn't happen" case.
4577 Try the DWP file and hope for the best. */
4578 if (dwp_file->tus == NULL)
4580 dwo_entry = lookup_dwo_in_dwp (dwp_file, dwp_file->tus, NULL,
4581 sig, 1 /* is_debug_types */);
4582 if (dwo_entry == NULL)
4585 sig_entry = add_type_unit (sig);
4586 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4588 /* The caller will signal a complaint if we return NULL.
4589 Here we don't return NULL but we still want to complain. */
4590 complaint (&symfile_complaints,
4591 _("Bad type signature %s referenced by %s at 0x%x,"
4592 " coping by using copy in DWP [in module %s]"),
4594 cu->per_cu->is_debug_types ? "TU" : "CU",
4595 cu->per_cu->offset.sect_off,
4601 /* Lookup a signature based type for DW_FORM_ref_sig8.
4602 Returns NULL if signature SIG is not present in the table.
4603 It is up to the caller to complain about this. */
4605 static struct signatured_type *
4606 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4609 && dwarf2_per_objfile->using_index)
4611 /* We're in a DWO/DWP file, and we're using .gdb_index.
4612 These cases require special processing. */
4613 if (get_dwp_file () == NULL)
4614 return lookup_dwo_signatured_type (cu, sig);
4616 return lookup_dwp_signatured_type (cu, sig);
4620 struct signatured_type find_entry, *entry;
4622 if (dwarf2_per_objfile->signatured_types == NULL)
4624 find_entry.signature = sig;
4625 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4630 /* Low level DIE reading support. */
4632 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4635 init_cu_die_reader (struct die_reader_specs *reader,
4636 struct dwarf2_cu *cu,
4637 struct dwarf2_section_info *section,
4638 struct dwo_file *dwo_file)
4640 gdb_assert (section->readin && section->buffer != NULL);
4641 reader->abfd = section->asection->owner;
4643 reader->dwo_file = dwo_file;
4644 reader->die_section = section;
4645 reader->buffer = section->buffer;
4646 reader->buffer_end = section->buffer + section->size;
4647 reader->comp_dir = NULL;
4650 /* Subroutine of init_cutu_and_read_dies to simplify it.
4651 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4652 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4655 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4656 from it to the DIE in the DWO. If NULL we are skipping the stub.
4657 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
4658 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
4659 attribute of the referencing CU. Exactly one of STUB_COMP_UNIT_DIE and
4660 COMP_DIR must be non-NULL.
4661 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4662 are filled in with the info of the DIE from the DWO file.
4663 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4664 provided an abbrev table to use.
4665 The result is non-zero if a valid (non-dummy) DIE was found. */
4668 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4669 struct dwo_unit *dwo_unit,
4670 int abbrev_table_provided,
4671 struct die_info *stub_comp_unit_die,
4672 const char *stub_comp_dir,
4673 struct die_reader_specs *result_reader,
4674 const gdb_byte **result_info_ptr,
4675 struct die_info **result_comp_unit_die,
4676 int *result_has_children)
4678 struct objfile *objfile = dwarf2_per_objfile->objfile;
4679 struct dwarf2_cu *cu = this_cu->cu;
4680 struct dwarf2_section_info *section;
4682 const gdb_byte *begin_info_ptr, *info_ptr;
4683 const char *comp_dir_string;
4684 ULONGEST signature; /* Or dwo_id. */
4685 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4686 int i,num_extra_attrs;
4687 struct dwarf2_section_info *dwo_abbrev_section;
4688 struct attribute *attr;
4689 struct attribute comp_dir_attr;
4690 struct die_info *comp_unit_die;
4692 /* Both can't be provided. */
4693 gdb_assert (! (stub_comp_unit_die && stub_comp_dir));
4695 /* These attributes aren't processed until later:
4696 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4697 However, the attribute is found in the stub which we won't have later.
4698 In order to not impose this complication on the rest of the code,
4699 we read them here and copy them to the DWO CU/TU die. */
4707 if (stub_comp_unit_die != NULL)
4709 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4711 if (! this_cu->is_debug_types)
4712 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4713 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4714 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4715 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4716 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4718 /* There should be a DW_AT_addr_base attribute here (if needed).
4719 We need the value before we can process DW_FORM_GNU_addr_index. */
4721 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4723 cu->addr_base = DW_UNSND (attr);
4725 /* There should be a DW_AT_ranges_base attribute here (if needed).
4726 We need the value before we can process DW_AT_ranges. */
4727 cu->ranges_base = 0;
4728 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4730 cu->ranges_base = DW_UNSND (attr);
4732 else if (stub_comp_dir != NULL)
4734 /* Reconstruct the comp_dir attribute to simplify the code below. */
4735 comp_dir = (struct attribute *)
4736 obstack_alloc (&cu->comp_unit_obstack, sizeof (*comp_dir));
4737 comp_dir->name = DW_AT_comp_dir;
4738 comp_dir->form = DW_FORM_string;
4739 DW_STRING_IS_CANONICAL (comp_dir) = 0;
4740 DW_STRING (comp_dir) = stub_comp_dir;
4743 /* Set up for reading the DWO CU/TU. */
4744 cu->dwo_unit = dwo_unit;
4745 section = dwo_unit->section;
4746 dwarf2_read_section (objfile, section);
4747 abfd = section->asection->owner;
4748 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4749 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4750 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
4752 if (this_cu->is_debug_types)
4754 ULONGEST header_signature;
4755 cu_offset type_offset_in_tu;
4756 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
4758 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4762 &type_offset_in_tu);
4763 /* This is not an assert because it can be caused by bad debug info. */
4764 if (sig_type->signature != header_signature)
4766 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
4767 " TU at offset 0x%x [in module %s]"),
4768 hex_string (sig_type->signature),
4769 hex_string (header_signature),
4770 dwo_unit->offset.sect_off,
4771 bfd_get_filename (abfd));
4773 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4774 /* For DWOs coming from DWP files, we don't know the CU length
4775 nor the type's offset in the TU until now. */
4776 dwo_unit->length = get_cu_length (&cu->header);
4777 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4779 /* Establish the type offset that can be used to lookup the type.
4780 For DWO files, we don't know it until now. */
4781 sig_type->type_offset_in_section.sect_off =
4782 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4786 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4789 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4790 /* For DWOs coming from DWP files, we don't know the CU length
4792 dwo_unit->length = get_cu_length (&cu->header);
4795 /* Replace the CU's original abbrev table with the DWO's.
4796 Reminder: We can't read the abbrev table until we've read the header. */
4797 if (abbrev_table_provided)
4799 /* Don't free the provided abbrev table, the caller of
4800 init_cutu_and_read_dies owns it. */
4801 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4802 /* Ensure the DWO abbrev table gets freed. */
4803 make_cleanup (dwarf2_free_abbrev_table, cu);
4807 dwarf2_free_abbrev_table (cu);
4808 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4809 /* Leave any existing abbrev table cleanup as is. */
4812 /* Read in the die, but leave space to copy over the attributes
4813 from the stub. This has the benefit of simplifying the rest of
4814 the code - all the work to maintain the illusion of a single
4815 DW_TAG_{compile,type}_unit DIE is done here. */
4816 num_extra_attrs = ((stmt_list != NULL)
4820 + (comp_dir != NULL));
4821 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
4822 result_has_children, num_extra_attrs);
4824 /* Copy over the attributes from the stub to the DIE we just read in. */
4825 comp_unit_die = *result_comp_unit_die;
4826 i = comp_unit_die->num_attrs;
4827 if (stmt_list != NULL)
4828 comp_unit_die->attrs[i++] = *stmt_list;
4830 comp_unit_die->attrs[i++] = *low_pc;
4831 if (high_pc != NULL)
4832 comp_unit_die->attrs[i++] = *high_pc;
4834 comp_unit_die->attrs[i++] = *ranges;
4835 if (comp_dir != NULL)
4836 comp_unit_die->attrs[i++] = *comp_dir;
4837 comp_unit_die->num_attrs += num_extra_attrs;
4839 if (dwarf2_die_debug)
4841 fprintf_unfiltered (gdb_stdlog,
4842 "Read die from %s@0x%x of %s:\n",
4843 bfd_section_name (abfd, section->asection),
4844 (unsigned) (begin_info_ptr - section->buffer),
4845 bfd_get_filename (abfd));
4846 dump_die (comp_unit_die, dwarf2_die_debug);
4849 /* Save the comp_dir attribute. If there is no DWP file then we'll read
4850 TUs by skipping the stub and going directly to the entry in the DWO file.
4851 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
4852 to get it via circuitous means. Blech. */
4853 if (comp_dir != NULL)
4854 result_reader->comp_dir = DW_STRING (comp_dir);
4856 /* Skip dummy compilation units. */
4857 if (info_ptr >= begin_info_ptr + dwo_unit->length
4858 || peek_abbrev_code (abfd, info_ptr) == 0)
4861 *result_info_ptr = info_ptr;
4865 /* Subroutine of init_cutu_and_read_dies to simplify it.
4866 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
4867 Returns NULL if the specified DWO unit cannot be found. */
4869 static struct dwo_unit *
4870 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
4871 struct die_info *comp_unit_die)
4873 struct dwarf2_cu *cu = this_cu->cu;
4874 struct attribute *attr;
4876 struct dwo_unit *dwo_unit;
4877 const char *comp_dir, *dwo_name;
4879 gdb_assert (cu != NULL);
4881 /* Yeah, we look dwo_name up again, but it simplifies the code. */
4882 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4883 gdb_assert (attr != NULL);
4884 dwo_name = DW_STRING (attr);
4886 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4888 comp_dir = DW_STRING (attr);
4890 if (this_cu->is_debug_types)
4892 struct signatured_type *sig_type;
4894 /* Since this_cu is the first member of struct signatured_type,
4895 we can go from a pointer to one to a pointer to the other. */
4896 sig_type = (struct signatured_type *) this_cu;
4897 signature = sig_type->signature;
4898 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
4902 struct attribute *attr;
4904 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4906 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
4908 dwo_name, this_cu->objfile->name);
4909 signature = DW_UNSND (attr);
4910 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
4917 /* Subroutine of init_cutu_and_read_dies to simplify it.
4918 Read a TU directly from a DWO file, bypassing the stub. */
4921 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, int keep,
4922 die_reader_func_ftype *die_reader_func,
4925 struct dwarf2_cu *cu;
4926 struct signatured_type *sig_type;
4927 struct cleanup *cleanups, *free_cu_cleanup;
4928 struct die_reader_specs reader;
4929 const gdb_byte *info_ptr;
4930 struct die_info *comp_unit_die;
4933 /* Verify we can do the following downcast, and that we have the
4935 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
4936 sig_type = (struct signatured_type *) this_cu;
4937 gdb_assert (sig_type->dwo_unit != NULL);
4939 cleanups = make_cleanup (null_cleanup, NULL);
4941 gdb_assert (this_cu->cu == NULL);
4942 cu = xmalloc (sizeof (*cu));
4943 init_one_comp_unit (cu, this_cu);
4944 /* If an error occurs while loading, release our storage. */
4945 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4947 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
4948 0 /* abbrev_table_provided */,
4949 NULL /* stub_comp_unit_die */,
4950 sig_type->dwo_unit->dwo_file->comp_dir,
4952 &comp_unit_die, &has_children) == 0)
4955 do_cleanups (cleanups);
4959 /* All the "real" work is done here. */
4960 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4962 /* This duplicates some code in init_cutu_and_read_dies,
4963 but the alternative is making the latter more complex.
4964 This function is only for the special case of using DWO files directly:
4965 no point in overly complicating the general case just to handle this. */
4968 /* We've successfully allocated this compilation unit. Let our
4969 caller clean it up when finished with it. */
4970 discard_cleanups (free_cu_cleanup);
4972 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4973 So we have to manually free the abbrev table. */
4974 dwarf2_free_abbrev_table (cu);
4976 /* Link this CU into read_in_chain. */
4977 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4978 dwarf2_per_objfile->read_in_chain = this_cu;
4981 do_cleanups (free_cu_cleanup);
4983 do_cleanups (cleanups);
4986 /* Initialize a CU (or TU) and read its DIEs.
4987 If the CU defers to a DWO file, read the DWO file as well.
4989 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4990 Otherwise the table specified in the comp unit header is read in and used.
4991 This is an optimization for when we already have the abbrev table.
4993 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4994 Otherwise, a new CU is allocated with xmalloc.
4996 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4997 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4999 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5000 linker) then DIE_READER_FUNC will not get called. */
5003 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5004 struct abbrev_table *abbrev_table,
5005 int use_existing_cu, int keep,
5006 die_reader_func_ftype *die_reader_func,
5009 struct objfile *objfile = dwarf2_per_objfile->objfile;
5010 struct dwarf2_section_info *section = this_cu->section;
5011 bfd *abfd = section->asection->owner;
5012 struct dwarf2_cu *cu;
5013 const gdb_byte *begin_info_ptr, *info_ptr;
5014 struct die_reader_specs reader;
5015 struct die_info *comp_unit_die;
5017 struct attribute *attr;
5018 struct cleanup *cleanups;
5019 struct signatured_type *sig_type = NULL;
5020 struct dwarf2_section_info *abbrev_section;
5021 /* Non-zero if CU currently points to a DWO file and we need to
5022 reread it. When this happens we need to reread the skeleton die
5023 before we can reread the DWO file (this only applies to CUs, not TUs). */
5024 int rereading_dwo_cu = 0;
5026 if (dwarf2_die_debug)
5027 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5028 this_cu->is_debug_types ? "type" : "comp",
5029 this_cu->offset.sect_off);
5031 if (use_existing_cu)
5034 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5035 file (instead of going through the stub), short-circuit all of this. */
5036 if (this_cu->reading_dwo_directly)
5038 /* Narrow down the scope of possibilities to have to understand. */
5039 gdb_assert (this_cu->is_debug_types);
5040 gdb_assert (abbrev_table == NULL);
5041 gdb_assert (!use_existing_cu);
5042 init_tu_and_read_dwo_dies (this_cu, keep, die_reader_func, data);
5046 cleanups = make_cleanup (null_cleanup, NULL);
5048 /* This is cheap if the section is already read in. */
5049 dwarf2_read_section (objfile, section);
5051 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5053 abbrev_section = get_abbrev_section_for_cu (this_cu);
5055 if (use_existing_cu && this_cu->cu != NULL)
5059 /* If this CU is from a DWO file we need to start over, we need to
5060 refetch the attributes from the skeleton CU.
5061 This could be optimized by retrieving those attributes from when we
5062 were here the first time: the previous comp_unit_die was stored in
5063 comp_unit_obstack. But there's no data yet that we need this
5065 if (cu->dwo_unit != NULL)
5066 rereading_dwo_cu = 1;
5070 /* If !use_existing_cu, this_cu->cu must be NULL. */
5071 gdb_assert (this_cu->cu == NULL);
5073 cu = xmalloc (sizeof (*cu));
5074 init_one_comp_unit (cu, this_cu);
5076 /* If an error occurs while loading, release our storage. */
5077 make_cleanup (free_heap_comp_unit, cu);
5080 /* Get the header. */
5081 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5083 /* We already have the header, there's no need to read it in again. */
5084 info_ptr += cu->header.first_die_offset.cu_off;
5088 if (this_cu->is_debug_types)
5091 cu_offset type_offset_in_tu;
5093 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5094 abbrev_section, info_ptr,
5096 &type_offset_in_tu);
5098 /* Since per_cu is the first member of struct signatured_type,
5099 we can go from a pointer to one to a pointer to the other. */
5100 sig_type = (struct signatured_type *) this_cu;
5101 gdb_assert (sig_type->signature == signature);
5102 gdb_assert (sig_type->type_offset_in_tu.cu_off
5103 == type_offset_in_tu.cu_off);
5104 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5106 /* LENGTH has not been set yet for type units if we're
5107 using .gdb_index. */
5108 this_cu->length = get_cu_length (&cu->header);
5110 /* Establish the type offset that can be used to lookup the type. */
5111 sig_type->type_offset_in_section.sect_off =
5112 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5116 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5120 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5121 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5125 /* Skip dummy compilation units. */
5126 if (info_ptr >= begin_info_ptr + this_cu->length
5127 || peek_abbrev_code (abfd, info_ptr) == 0)
5129 do_cleanups (cleanups);
5133 /* If we don't have them yet, read the abbrevs for this compilation unit.
5134 And if we need to read them now, make sure they're freed when we're
5135 done. Note that it's important that if the CU had an abbrev table
5136 on entry we don't free it when we're done: Somewhere up the call stack
5137 it may be in use. */
5138 if (abbrev_table != NULL)
5140 gdb_assert (cu->abbrev_table == NULL);
5141 gdb_assert (cu->header.abbrev_offset.sect_off
5142 == abbrev_table->offset.sect_off);
5143 cu->abbrev_table = abbrev_table;
5145 else if (cu->abbrev_table == NULL)
5147 dwarf2_read_abbrevs (cu, abbrev_section);
5148 make_cleanup (dwarf2_free_abbrev_table, cu);
5150 else if (rereading_dwo_cu)
5152 dwarf2_free_abbrev_table (cu);
5153 dwarf2_read_abbrevs (cu, abbrev_section);
5156 /* Read the top level CU/TU die. */
5157 init_cu_die_reader (&reader, cu, section, NULL);
5158 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5160 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5162 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5163 DWO CU, that this test will fail (the attribute will not be present). */
5164 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5167 struct dwo_unit *dwo_unit;
5168 struct die_info *dwo_comp_unit_die;
5172 complaint (&symfile_complaints,
5173 _("compilation unit with DW_AT_GNU_dwo_name"
5174 " has children (offset 0x%x) [in module %s]"),
5175 this_cu->offset.sect_off, bfd_get_filename (abfd));
5177 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5178 if (dwo_unit != NULL)
5180 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5181 abbrev_table != NULL,
5182 comp_unit_die, NULL,
5184 &dwo_comp_unit_die, &has_children) == 0)
5187 do_cleanups (cleanups);
5190 comp_unit_die = dwo_comp_unit_die;
5194 /* Yikes, we couldn't find the rest of the DIE, we only have
5195 the stub. A complaint has already been logged. There's
5196 not much more we can do except pass on the stub DIE to
5197 die_reader_func. We don't want to throw an error on bad
5202 /* All of the above is setup for this call. Yikes. */
5203 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5205 /* Done, clean up. */
5208 /* We've successfully allocated this compilation unit. Let our
5209 caller clean it up when finished with it. */
5210 discard_cleanups (cleanups);
5212 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5213 So we have to manually free the abbrev table. */
5214 dwarf2_free_abbrev_table (cu);
5216 /* Link this CU into read_in_chain. */
5217 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5218 dwarf2_per_objfile->read_in_chain = this_cu;
5221 do_cleanups (cleanups);
5224 /* Read CU/TU THIS_CU in section SECTION,
5225 but do not follow DW_AT_GNU_dwo_name if present.
5226 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
5227 to have already done the lookup to find the DWO/DWP file).
5229 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5230 THIS_CU->is_debug_types, but nothing else.
5232 We fill in THIS_CU->length.
5234 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5235 linker) then DIE_READER_FUNC will not get called.
5237 THIS_CU->cu is always freed when done.
5238 This is done in order to not leave THIS_CU->cu in a state where we have
5239 to care whether it refers to the "main" CU or the DWO CU. */
5242 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5243 struct dwarf2_section_info *abbrev_section,
5244 struct dwo_file *dwo_file,
5245 die_reader_func_ftype *die_reader_func,
5248 struct objfile *objfile = dwarf2_per_objfile->objfile;
5249 struct dwarf2_section_info *section = this_cu->section;
5250 bfd *abfd = section->asection->owner;
5251 struct dwarf2_cu cu;
5252 const gdb_byte *begin_info_ptr, *info_ptr;
5253 struct die_reader_specs reader;
5254 struct cleanup *cleanups;
5255 struct die_info *comp_unit_die;
5258 if (dwarf2_die_debug)
5259 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5260 this_cu->is_debug_types ? "type" : "comp",
5261 this_cu->offset.sect_off);
5263 gdb_assert (this_cu->cu == NULL);
5265 /* This is cheap if the section is already read in. */
5266 dwarf2_read_section (objfile, section);
5268 init_one_comp_unit (&cu, this_cu);
5270 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5272 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5273 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5274 abbrev_section, info_ptr,
5275 this_cu->is_debug_types);
5277 this_cu->length = get_cu_length (&cu.header);
5279 /* Skip dummy compilation units. */
5280 if (info_ptr >= begin_info_ptr + this_cu->length
5281 || peek_abbrev_code (abfd, info_ptr) == 0)
5283 do_cleanups (cleanups);
5287 dwarf2_read_abbrevs (&cu, abbrev_section);
5288 make_cleanup (dwarf2_free_abbrev_table, &cu);
5290 init_cu_die_reader (&reader, &cu, section, dwo_file);
5291 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5293 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5295 do_cleanups (cleanups);
5298 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5299 does not lookup the specified DWO file.
5300 This cannot be used to read DWO files.
5302 THIS_CU->cu is always freed when done.
5303 This is done in order to not leave THIS_CU->cu in a state where we have
5304 to care whether it refers to the "main" CU or the DWO CU.
5305 We can revisit this if the data shows there's a performance issue. */
5308 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5309 die_reader_func_ftype *die_reader_func,
5312 init_cutu_and_read_dies_no_follow (this_cu,
5313 get_abbrev_section_for_cu (this_cu),
5315 die_reader_func, data);
5318 /* Type Unit Groups.
5320 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5321 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5322 so that all types coming from the same compilation (.o file) are grouped
5323 together. A future step could be to put the types in the same symtab as
5324 the CU the types ultimately came from. */
5327 hash_type_unit_group (const void *item)
5329 const struct type_unit_group *tu_group = item;
5331 return hash_stmt_list_entry (&tu_group->hash);
5335 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5337 const struct type_unit_group *lhs = item_lhs;
5338 const struct type_unit_group *rhs = item_rhs;
5340 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5343 /* Allocate a hash table for type unit groups. */
5346 allocate_type_unit_groups_table (void)
5348 return htab_create_alloc_ex (3,
5349 hash_type_unit_group,
5352 &dwarf2_per_objfile->objfile->objfile_obstack,
5353 hashtab_obstack_allocate,
5354 dummy_obstack_deallocate);
5357 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5358 partial symtabs. We combine several TUs per psymtab to not let the size
5359 of any one psymtab grow too big. */
5360 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5361 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5363 /* Helper routine for get_type_unit_group.
5364 Create the type_unit_group object used to hold one or more TUs. */
5366 static struct type_unit_group *
5367 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5369 struct objfile *objfile = dwarf2_per_objfile->objfile;
5370 struct dwarf2_per_cu_data *per_cu;
5371 struct type_unit_group *tu_group;
5373 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5374 struct type_unit_group);
5375 per_cu = &tu_group->per_cu;
5376 per_cu->objfile = objfile;
5378 if (dwarf2_per_objfile->using_index)
5380 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5381 struct dwarf2_per_cu_quick_data);
5385 unsigned int line_offset = line_offset_struct.sect_off;
5386 struct partial_symtab *pst;
5389 /* Give the symtab a useful name for debug purposes. */
5390 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5391 name = xstrprintf ("<type_units_%d>",
5392 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5394 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5396 pst = create_partial_symtab (per_cu, name);
5402 tu_group->hash.dwo_unit = cu->dwo_unit;
5403 tu_group->hash.line_offset = line_offset_struct;
5408 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5409 STMT_LIST is a DW_AT_stmt_list attribute. */
5411 static struct type_unit_group *
5412 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5414 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5415 struct type_unit_group *tu_group;
5417 unsigned int line_offset;
5418 struct type_unit_group type_unit_group_for_lookup;
5420 if (dwarf2_per_objfile->type_unit_groups == NULL)
5422 dwarf2_per_objfile->type_unit_groups =
5423 allocate_type_unit_groups_table ();
5426 /* Do we need to create a new group, or can we use an existing one? */
5430 line_offset = DW_UNSND (stmt_list);
5431 ++tu_stats->nr_symtab_sharers;
5435 /* Ugh, no stmt_list. Rare, but we have to handle it.
5436 We can do various things here like create one group per TU or
5437 spread them over multiple groups to split up the expansion work.
5438 To avoid worst case scenarios (too many groups or too large groups)
5439 we, umm, group them in bunches. */
5440 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5441 | (tu_stats->nr_stmt_less_type_units
5442 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5443 ++tu_stats->nr_stmt_less_type_units;
5446 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5447 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5448 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5449 &type_unit_group_for_lookup, INSERT);
5453 gdb_assert (tu_group != NULL);
5457 sect_offset line_offset_struct;
5459 line_offset_struct.sect_off = line_offset;
5460 tu_group = create_type_unit_group (cu, line_offset_struct);
5462 ++tu_stats->nr_symtabs;
5468 /* Struct used to sort TUs by their abbreviation table offset. */
5470 struct tu_abbrev_offset
5472 struct signatured_type *sig_type;
5473 sect_offset abbrev_offset;
5476 /* Helper routine for build_type_unit_groups, passed to qsort. */
5479 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5481 const struct tu_abbrev_offset * const *a = ap;
5482 const struct tu_abbrev_offset * const *b = bp;
5483 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5484 unsigned int boff = (*b)->abbrev_offset.sect_off;
5486 return (aoff > boff) - (aoff < boff);
5489 /* A helper function to add a type_unit_group to a table. */
5492 add_type_unit_group_to_table (void **slot, void *datum)
5494 struct type_unit_group *tu_group = *slot;
5495 struct type_unit_group ***datap = datum;
5503 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5504 each one passing FUNC,DATA.
5506 The efficiency is because we sort TUs by the abbrev table they use and
5507 only read each abbrev table once. In one program there are 200K TUs
5508 sharing 8K abbrev tables.
5510 The main purpose of this function is to support building the
5511 dwarf2_per_objfile->type_unit_groups table.
5512 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5513 can collapse the search space by grouping them by stmt_list.
5514 The savings can be significant, in the same program from above the 200K TUs
5515 share 8K stmt_list tables.
5517 FUNC is expected to call get_type_unit_group, which will create the
5518 struct type_unit_group if necessary and add it to
5519 dwarf2_per_objfile->type_unit_groups. */
5522 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5524 struct objfile *objfile = dwarf2_per_objfile->objfile;
5525 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5526 struct cleanup *cleanups;
5527 struct abbrev_table *abbrev_table;
5528 sect_offset abbrev_offset;
5529 struct tu_abbrev_offset *sorted_by_abbrev;
5530 struct type_unit_group **iter;
5533 /* It's up to the caller to not call us multiple times. */
5534 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5536 if (dwarf2_per_objfile->n_type_units == 0)
5539 /* TUs typically share abbrev tables, and there can be way more TUs than
5540 abbrev tables. Sort by abbrev table to reduce the number of times we
5541 read each abbrev table in.
5542 Alternatives are to punt or to maintain a cache of abbrev tables.
5543 This is simpler and efficient enough for now.
5545 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5546 symtab to use). Typically TUs with the same abbrev offset have the same
5547 stmt_list value too so in practice this should work well.
5549 The basic algorithm here is:
5551 sort TUs by abbrev table
5552 for each TU with same abbrev table:
5553 read abbrev table if first user
5554 read TU top level DIE
5555 [IWBN if DWO skeletons had DW_AT_stmt_list]
5558 if (dwarf2_read_debug)
5559 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5561 /* Sort in a separate table to maintain the order of all_type_units
5562 for .gdb_index: TU indices directly index all_type_units. */
5563 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5564 dwarf2_per_objfile->n_type_units);
5565 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5567 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5569 sorted_by_abbrev[i].sig_type = sig_type;
5570 sorted_by_abbrev[i].abbrev_offset =
5571 read_abbrev_offset (sig_type->per_cu.section,
5572 sig_type->per_cu.offset);
5574 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5575 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5576 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5578 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5579 called any number of times, so we don't reset tu_stats here. */
5581 abbrev_offset.sect_off = ~(unsigned) 0;
5582 abbrev_table = NULL;
5583 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5585 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5587 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5589 /* Switch to the next abbrev table if necessary. */
5590 if (abbrev_table == NULL
5591 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5593 if (abbrev_table != NULL)
5595 abbrev_table_free (abbrev_table);
5596 /* Reset to NULL in case abbrev_table_read_table throws
5597 an error: abbrev_table_free_cleanup will get called. */
5598 abbrev_table = NULL;
5600 abbrev_offset = tu->abbrev_offset;
5602 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5604 ++tu_stats->nr_uniq_abbrev_tables;
5607 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5611 /* type_unit_groups can be NULL if there is an error in the debug info.
5612 Just create an empty table so the rest of gdb doesn't have to watch
5613 for this error case. */
5614 if (dwarf2_per_objfile->type_unit_groups == NULL)
5616 dwarf2_per_objfile->type_unit_groups =
5617 allocate_type_unit_groups_table ();
5618 dwarf2_per_objfile->n_type_unit_groups = 0;
5621 /* Create a vector of pointers to primary type units to make it easy to
5622 iterate over them and CUs. See dw2_get_primary_cu. */
5623 dwarf2_per_objfile->n_type_unit_groups =
5624 htab_elements (dwarf2_per_objfile->type_unit_groups);
5625 dwarf2_per_objfile->all_type_unit_groups =
5626 obstack_alloc (&objfile->objfile_obstack,
5627 dwarf2_per_objfile->n_type_unit_groups
5628 * sizeof (struct type_unit_group *));
5629 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5630 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5631 add_type_unit_group_to_table, &iter);
5632 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5633 == dwarf2_per_objfile->n_type_unit_groups);
5635 do_cleanups (cleanups);
5637 if (dwarf2_read_debug)
5639 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5640 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5641 dwarf2_per_objfile->n_type_units);
5642 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5643 tu_stats->nr_uniq_abbrev_tables);
5644 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5645 tu_stats->nr_symtabs);
5646 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5647 tu_stats->nr_symtab_sharers);
5648 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5649 tu_stats->nr_stmt_less_type_units);
5653 /* Partial symbol tables. */
5655 /* Create a psymtab named NAME and assign it to PER_CU.
5657 The caller must fill in the following details:
5658 dirname, textlow, texthigh. */
5660 static struct partial_symtab *
5661 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5663 struct objfile *objfile = per_cu->objfile;
5664 struct partial_symtab *pst;
5666 pst = start_psymtab_common (objfile, objfile->section_offsets,
5668 objfile->global_psymbols.next,
5669 objfile->static_psymbols.next);
5671 pst->psymtabs_addrmap_supported = 1;
5673 /* This is the glue that links PST into GDB's symbol API. */
5674 pst->read_symtab_private = per_cu;
5675 pst->read_symtab = dwarf2_read_symtab;
5676 per_cu->v.psymtab = pst;
5681 /* die_reader_func for process_psymtab_comp_unit. */
5684 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5685 const gdb_byte *info_ptr,
5686 struct die_info *comp_unit_die,
5690 struct dwarf2_cu *cu = reader->cu;
5691 struct objfile *objfile = cu->objfile;
5692 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5693 struct attribute *attr;
5695 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5696 struct partial_symtab *pst;
5698 const char *filename;
5699 int *want_partial_unit_ptr = data;
5701 if (comp_unit_die->tag == DW_TAG_partial_unit
5702 && (want_partial_unit_ptr == NULL
5703 || !*want_partial_unit_ptr))
5706 gdb_assert (! per_cu->is_debug_types);
5708 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5710 cu->list_in_scope = &file_symbols;
5712 /* Allocate a new partial symbol table structure. */
5713 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5714 if (attr == NULL || !DW_STRING (attr))
5717 filename = DW_STRING (attr);
5719 pst = create_partial_symtab (per_cu, filename);
5721 /* This must be done before calling dwarf2_build_include_psymtabs. */
5722 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5724 pst->dirname = DW_STRING (attr);
5726 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5728 dwarf2_find_base_address (comp_unit_die, cu);
5730 /* Possibly set the default values of LOWPC and HIGHPC from
5732 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5733 &best_highpc, cu, pst);
5734 if (has_pc_info == 1 && best_lowpc < best_highpc)
5735 /* Store the contiguous range if it is not empty; it can be empty for
5736 CUs with no code. */
5737 addrmap_set_empty (objfile->psymtabs_addrmap,
5738 best_lowpc + baseaddr,
5739 best_highpc + baseaddr - 1, pst);
5741 /* Check if comp unit has_children.
5742 If so, read the rest of the partial symbols from this comp unit.
5743 If not, there's no more debug_info for this comp unit. */
5746 struct partial_die_info *first_die;
5747 CORE_ADDR lowpc, highpc;
5749 lowpc = ((CORE_ADDR) -1);
5750 highpc = ((CORE_ADDR) 0);
5752 first_die = load_partial_dies (reader, info_ptr, 1);
5754 scan_partial_symbols (first_die, &lowpc, &highpc,
5757 /* If we didn't find a lowpc, set it to highpc to avoid
5758 complaints from `maint check'. */
5759 if (lowpc == ((CORE_ADDR) -1))
5762 /* If the compilation unit didn't have an explicit address range,
5763 then use the information extracted from its child dies. */
5767 best_highpc = highpc;
5770 pst->textlow = best_lowpc + baseaddr;
5771 pst->texthigh = best_highpc + baseaddr;
5773 pst->n_global_syms = objfile->global_psymbols.next -
5774 (objfile->global_psymbols.list + pst->globals_offset);
5775 pst->n_static_syms = objfile->static_psymbols.next -
5776 (objfile->static_psymbols.list + pst->statics_offset);
5777 sort_pst_symbols (objfile, pst);
5779 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5782 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5783 struct dwarf2_per_cu_data *iter;
5785 /* Fill in 'dependencies' here; we fill in 'users' in a
5787 pst->number_of_dependencies = len;
5788 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5789 len * sizeof (struct symtab *));
5791 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5794 pst->dependencies[i] = iter->v.psymtab;
5796 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5799 /* Get the list of files included in the current compilation unit,
5800 and build a psymtab for each of them. */
5801 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5803 if (dwarf2_read_debug)
5805 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5807 fprintf_unfiltered (gdb_stdlog,
5808 "Psymtab for %s unit @0x%x: %s - %s"
5809 ", %d global, %d static syms\n",
5810 per_cu->is_debug_types ? "type" : "comp",
5811 per_cu->offset.sect_off,
5812 paddress (gdbarch, pst->textlow),
5813 paddress (gdbarch, pst->texthigh),
5814 pst->n_global_syms, pst->n_static_syms);
5818 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5819 Process compilation unit THIS_CU for a psymtab. */
5822 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5823 int want_partial_unit)
5825 /* If this compilation unit was already read in, free the
5826 cached copy in order to read it in again. This is
5827 necessary because we skipped some symbols when we first
5828 read in the compilation unit (see load_partial_dies).
5829 This problem could be avoided, but the benefit is unclear. */
5830 if (this_cu->cu != NULL)
5831 free_one_cached_comp_unit (this_cu);
5833 gdb_assert (! this_cu->is_debug_types);
5834 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5835 process_psymtab_comp_unit_reader,
5836 &want_partial_unit);
5838 /* Age out any secondary CUs. */
5839 age_cached_comp_units ();
5842 /* Reader function for build_type_psymtabs. */
5845 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5846 const gdb_byte *info_ptr,
5847 struct die_info *type_unit_die,
5851 struct objfile *objfile = dwarf2_per_objfile->objfile;
5852 struct dwarf2_cu *cu = reader->cu;
5853 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5854 struct signatured_type *sig_type;
5855 struct type_unit_group *tu_group;
5856 struct attribute *attr;
5857 struct partial_die_info *first_die;
5858 CORE_ADDR lowpc, highpc;
5859 struct partial_symtab *pst;
5861 gdb_assert (data == NULL);
5862 gdb_assert (per_cu->is_debug_types);
5863 sig_type = (struct signatured_type *) per_cu;
5868 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5869 tu_group = get_type_unit_group (cu, attr);
5871 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5873 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5874 cu->list_in_scope = &file_symbols;
5875 pst = create_partial_symtab (per_cu, "");
5878 first_die = load_partial_dies (reader, info_ptr, 1);
5880 lowpc = (CORE_ADDR) -1;
5881 highpc = (CORE_ADDR) 0;
5882 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5884 pst->n_global_syms = objfile->global_psymbols.next -
5885 (objfile->global_psymbols.list + pst->globals_offset);
5886 pst->n_static_syms = objfile->static_psymbols.next -
5887 (objfile->static_psymbols.list + pst->statics_offset);
5888 sort_pst_symbols (objfile, pst);
5891 /* Traversal function for build_type_psymtabs. */
5894 build_type_psymtab_dependencies (void **slot, void *info)
5896 struct objfile *objfile = dwarf2_per_objfile->objfile;
5897 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5898 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5899 struct partial_symtab *pst = per_cu->v.psymtab;
5900 int len = VEC_length (sig_type_ptr, tu_group->tus);
5901 struct signatured_type *iter;
5904 gdb_assert (len > 0);
5905 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5907 pst->number_of_dependencies = len;
5908 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5909 len * sizeof (struct psymtab *));
5911 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5914 gdb_assert (iter->per_cu.is_debug_types);
5915 pst->dependencies[i] = iter->per_cu.v.psymtab;
5916 iter->type_unit_group = tu_group;
5919 VEC_free (sig_type_ptr, tu_group->tus);
5924 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5925 Build partial symbol tables for the .debug_types comp-units. */
5928 build_type_psymtabs (struct objfile *objfile)
5930 if (! create_all_type_units (objfile))
5933 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5935 /* Now that all TUs have been processed we can fill in the dependencies. */
5936 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5937 build_type_psymtab_dependencies, NULL);
5940 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5943 psymtabs_addrmap_cleanup (void *o)
5945 struct objfile *objfile = o;
5947 objfile->psymtabs_addrmap = NULL;
5950 /* Compute the 'user' field for each psymtab in OBJFILE. */
5953 set_partial_user (struct objfile *objfile)
5957 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5959 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5960 struct partial_symtab *pst = per_cu->v.psymtab;
5966 for (j = 0; j < pst->number_of_dependencies; ++j)
5968 /* Set the 'user' field only if it is not already set. */
5969 if (pst->dependencies[j]->user == NULL)
5970 pst->dependencies[j]->user = pst;
5975 /* Build the partial symbol table by doing a quick pass through the
5976 .debug_info and .debug_abbrev sections. */
5979 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5981 struct cleanup *back_to, *addrmap_cleanup;
5982 struct obstack temp_obstack;
5985 if (dwarf2_read_debug)
5987 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5991 dwarf2_per_objfile->reading_partial_symbols = 1;
5993 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5995 /* Any cached compilation units will be linked by the per-objfile
5996 read_in_chain. Make sure to free them when we're done. */
5997 back_to = make_cleanup (free_cached_comp_units, NULL);
5999 build_type_psymtabs (objfile);
6001 create_all_comp_units (objfile);
6003 /* Create a temporary address map on a temporary obstack. We later
6004 copy this to the final obstack. */
6005 obstack_init (&temp_obstack);
6006 make_cleanup_obstack_free (&temp_obstack);
6007 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6008 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6010 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6012 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6014 process_psymtab_comp_unit (per_cu, 0);
6017 set_partial_user (objfile);
6019 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6020 &objfile->objfile_obstack);
6021 discard_cleanups (addrmap_cleanup);
6023 do_cleanups (back_to);
6025 if (dwarf2_read_debug)
6026 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6030 /* die_reader_func for load_partial_comp_unit. */
6033 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6034 const gdb_byte *info_ptr,
6035 struct die_info *comp_unit_die,
6039 struct dwarf2_cu *cu = reader->cu;
6041 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6043 /* Check if comp unit has_children.
6044 If so, read the rest of the partial symbols from this comp unit.
6045 If not, there's no more debug_info for this comp unit. */
6047 load_partial_dies (reader, info_ptr, 0);
6050 /* Load the partial DIEs for a secondary CU into memory.
6051 This is also used when rereading a primary CU with load_all_dies. */
6054 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6056 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6057 load_partial_comp_unit_reader, NULL);
6061 read_comp_units_from_section (struct objfile *objfile,
6062 struct dwarf2_section_info *section,
6063 unsigned int is_dwz,
6066 struct dwarf2_per_cu_data ***all_comp_units)
6068 const gdb_byte *info_ptr;
6069 bfd *abfd = section->asection->owner;
6071 if (dwarf2_read_debug)
6072 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6073 section->asection->name, bfd_get_filename (abfd));
6075 dwarf2_read_section (objfile, section);
6077 info_ptr = section->buffer;
6079 while (info_ptr < section->buffer + section->size)
6081 unsigned int length, initial_length_size;
6082 struct dwarf2_per_cu_data *this_cu;
6085 offset.sect_off = info_ptr - section->buffer;
6087 /* Read just enough information to find out where the next
6088 compilation unit is. */
6089 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6091 /* Save the compilation unit for later lookup. */
6092 this_cu = obstack_alloc (&objfile->objfile_obstack,
6093 sizeof (struct dwarf2_per_cu_data));
6094 memset (this_cu, 0, sizeof (*this_cu));
6095 this_cu->offset = offset;
6096 this_cu->length = length + initial_length_size;
6097 this_cu->is_dwz = is_dwz;
6098 this_cu->objfile = objfile;
6099 this_cu->section = section;
6101 if (*n_comp_units == *n_allocated)
6104 *all_comp_units = xrealloc (*all_comp_units,
6106 * sizeof (struct dwarf2_per_cu_data *));
6108 (*all_comp_units)[*n_comp_units] = this_cu;
6111 info_ptr = info_ptr + this_cu->length;
6115 /* Create a list of all compilation units in OBJFILE.
6116 This is only done for -readnow and building partial symtabs. */
6119 create_all_comp_units (struct objfile *objfile)
6123 struct dwarf2_per_cu_data **all_comp_units;
6124 struct dwz_file *dwz;
6128 all_comp_units = xmalloc (n_allocated
6129 * sizeof (struct dwarf2_per_cu_data *));
6131 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6132 &n_allocated, &n_comp_units, &all_comp_units);
6134 dwz = dwarf2_get_dwz_file ();
6136 read_comp_units_from_section (objfile, &dwz->info, 1,
6137 &n_allocated, &n_comp_units,
6140 dwarf2_per_objfile->all_comp_units
6141 = obstack_alloc (&objfile->objfile_obstack,
6142 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6143 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6144 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6145 xfree (all_comp_units);
6146 dwarf2_per_objfile->n_comp_units = n_comp_units;
6149 /* Process all loaded DIEs for compilation unit CU, starting at
6150 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6151 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6152 DW_AT_ranges). If NEED_PC is set, then this function will set
6153 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6154 and record the covered ranges in the addrmap. */
6157 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6158 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6160 struct partial_die_info *pdi;
6162 /* Now, march along the PDI's, descending into ones which have
6163 interesting children but skipping the children of the other ones,
6164 until we reach the end of the compilation unit. */
6170 fixup_partial_die (pdi, cu);
6172 /* Anonymous namespaces or modules have no name but have interesting
6173 children, so we need to look at them. Ditto for anonymous
6176 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6177 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6178 || pdi->tag == DW_TAG_imported_unit)
6182 case DW_TAG_subprogram:
6183 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6185 case DW_TAG_constant:
6186 case DW_TAG_variable:
6187 case DW_TAG_typedef:
6188 case DW_TAG_union_type:
6189 if (!pdi->is_declaration)
6191 add_partial_symbol (pdi, cu);
6194 case DW_TAG_class_type:
6195 case DW_TAG_interface_type:
6196 case DW_TAG_structure_type:
6197 if (!pdi->is_declaration)
6199 add_partial_symbol (pdi, cu);
6202 case DW_TAG_enumeration_type:
6203 if (!pdi->is_declaration)
6204 add_partial_enumeration (pdi, cu);
6206 case DW_TAG_base_type:
6207 case DW_TAG_subrange_type:
6208 /* File scope base type definitions are added to the partial
6210 add_partial_symbol (pdi, cu);
6212 case DW_TAG_namespace:
6213 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6216 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6218 case DW_TAG_imported_unit:
6220 struct dwarf2_per_cu_data *per_cu;
6222 /* For now we don't handle imported units in type units. */
6223 if (cu->per_cu->is_debug_types)
6225 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6226 " supported in type units [in module %s]"),
6230 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6234 /* Go read the partial unit, if needed. */
6235 if (per_cu->v.psymtab == NULL)
6236 process_psymtab_comp_unit (per_cu, 1);
6238 VEC_safe_push (dwarf2_per_cu_ptr,
6239 cu->per_cu->imported_symtabs, per_cu);
6247 /* If the die has a sibling, skip to the sibling. */
6249 pdi = pdi->die_sibling;
6253 /* Functions used to compute the fully scoped name of a partial DIE.
6255 Normally, this is simple. For C++, the parent DIE's fully scoped
6256 name is concatenated with "::" and the partial DIE's name. For
6257 Java, the same thing occurs except that "." is used instead of "::".
6258 Enumerators are an exception; they use the scope of their parent
6259 enumeration type, i.e. the name of the enumeration type is not
6260 prepended to the enumerator.
6262 There are two complexities. One is DW_AT_specification; in this
6263 case "parent" means the parent of the target of the specification,
6264 instead of the direct parent of the DIE. The other is compilers
6265 which do not emit DW_TAG_namespace; in this case we try to guess
6266 the fully qualified name of structure types from their members'
6267 linkage names. This must be done using the DIE's children rather
6268 than the children of any DW_AT_specification target. We only need
6269 to do this for structures at the top level, i.e. if the target of
6270 any DW_AT_specification (if any; otherwise the DIE itself) does not
6273 /* Compute the scope prefix associated with PDI's parent, in
6274 compilation unit CU. The result will be allocated on CU's
6275 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6276 field. NULL is returned if no prefix is necessary. */
6278 partial_die_parent_scope (struct partial_die_info *pdi,
6279 struct dwarf2_cu *cu)
6281 const char *grandparent_scope;
6282 struct partial_die_info *parent, *real_pdi;
6284 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6285 then this means the parent of the specification DIE. */
6288 while (real_pdi->has_specification)
6289 real_pdi = find_partial_die (real_pdi->spec_offset,
6290 real_pdi->spec_is_dwz, cu);
6292 parent = real_pdi->die_parent;
6296 if (parent->scope_set)
6297 return parent->scope;
6299 fixup_partial_die (parent, cu);
6301 grandparent_scope = partial_die_parent_scope (parent, cu);
6303 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6304 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6305 Work around this problem here. */
6306 if (cu->language == language_cplus
6307 && parent->tag == DW_TAG_namespace
6308 && strcmp (parent->name, "::") == 0
6309 && grandparent_scope == NULL)
6311 parent->scope = NULL;
6312 parent->scope_set = 1;
6316 if (pdi->tag == DW_TAG_enumerator)
6317 /* Enumerators should not get the name of the enumeration as a prefix. */
6318 parent->scope = grandparent_scope;
6319 else if (parent->tag == DW_TAG_namespace
6320 || parent->tag == DW_TAG_module
6321 || parent->tag == DW_TAG_structure_type
6322 || parent->tag == DW_TAG_class_type
6323 || parent->tag == DW_TAG_interface_type
6324 || parent->tag == DW_TAG_union_type
6325 || parent->tag == DW_TAG_enumeration_type)
6327 if (grandparent_scope == NULL)
6328 parent->scope = parent->name;
6330 parent->scope = typename_concat (&cu->comp_unit_obstack,
6332 parent->name, 0, cu);
6336 /* FIXME drow/2004-04-01: What should we be doing with
6337 function-local names? For partial symbols, we should probably be
6339 complaint (&symfile_complaints,
6340 _("unhandled containing DIE tag %d for DIE at %d"),
6341 parent->tag, pdi->offset.sect_off);
6342 parent->scope = grandparent_scope;
6345 parent->scope_set = 1;
6346 return parent->scope;
6349 /* Return the fully scoped name associated with PDI, from compilation unit
6350 CU. The result will be allocated with malloc. */
6353 partial_die_full_name (struct partial_die_info *pdi,
6354 struct dwarf2_cu *cu)
6356 const char *parent_scope;
6358 /* If this is a template instantiation, we can not work out the
6359 template arguments from partial DIEs. So, unfortunately, we have
6360 to go through the full DIEs. At least any work we do building
6361 types here will be reused if full symbols are loaded later. */
6362 if (pdi->has_template_arguments)
6364 fixup_partial_die (pdi, cu);
6366 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6368 struct die_info *die;
6369 struct attribute attr;
6370 struct dwarf2_cu *ref_cu = cu;
6372 /* DW_FORM_ref_addr is using section offset. */
6374 attr.form = DW_FORM_ref_addr;
6375 attr.u.unsnd = pdi->offset.sect_off;
6376 die = follow_die_ref (NULL, &attr, &ref_cu);
6378 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6382 parent_scope = partial_die_parent_scope (pdi, cu);
6383 if (parent_scope == NULL)
6386 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6390 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6392 struct objfile *objfile = cu->objfile;
6394 const char *actual_name = NULL;
6396 char *built_actual_name;
6398 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6400 built_actual_name = partial_die_full_name (pdi, cu);
6401 if (built_actual_name != NULL)
6402 actual_name = built_actual_name;
6404 if (actual_name == NULL)
6405 actual_name = pdi->name;
6409 case DW_TAG_subprogram:
6410 if (pdi->is_external || cu->language == language_ada)
6412 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6413 of the global scope. But in Ada, we want to be able to access
6414 nested procedures globally. So all Ada subprograms are stored
6415 in the global scope. */
6416 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6417 mst_text, objfile); */
6418 add_psymbol_to_list (actual_name, strlen (actual_name),
6419 built_actual_name != NULL,
6420 VAR_DOMAIN, LOC_BLOCK,
6421 &objfile->global_psymbols,
6422 0, pdi->lowpc + baseaddr,
6423 cu->language, objfile);
6427 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6428 mst_file_text, objfile); */
6429 add_psymbol_to_list (actual_name, strlen (actual_name),
6430 built_actual_name != NULL,
6431 VAR_DOMAIN, LOC_BLOCK,
6432 &objfile->static_psymbols,
6433 0, pdi->lowpc + baseaddr,
6434 cu->language, objfile);
6437 case DW_TAG_constant:
6439 struct psymbol_allocation_list *list;
6441 if (pdi->is_external)
6442 list = &objfile->global_psymbols;
6444 list = &objfile->static_psymbols;
6445 add_psymbol_to_list (actual_name, strlen (actual_name),
6446 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6447 list, 0, 0, cu->language, objfile);
6450 case DW_TAG_variable:
6452 addr = decode_locdesc (pdi->d.locdesc, cu);
6456 && !dwarf2_per_objfile->has_section_at_zero)
6458 /* A global or static variable may also have been stripped
6459 out by the linker if unused, in which case its address
6460 will be nullified; do not add such variables into partial
6461 symbol table then. */
6463 else if (pdi->is_external)
6466 Don't enter into the minimal symbol tables as there is
6467 a minimal symbol table entry from the ELF symbols already.
6468 Enter into partial symbol table if it has a location
6469 descriptor or a type.
6470 If the location descriptor is missing, new_symbol will create
6471 a LOC_UNRESOLVED symbol, the address of the variable will then
6472 be determined from the minimal symbol table whenever the variable
6474 The address for the partial symbol table entry is not
6475 used by GDB, but it comes in handy for debugging partial symbol
6478 if (pdi->d.locdesc || pdi->has_type)
6479 add_psymbol_to_list (actual_name, strlen (actual_name),
6480 built_actual_name != NULL,
6481 VAR_DOMAIN, LOC_STATIC,
6482 &objfile->global_psymbols,
6484 cu->language, objfile);
6488 /* Static Variable. Skip symbols without location descriptors. */
6489 if (pdi->d.locdesc == NULL)
6491 xfree (built_actual_name);
6494 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6495 mst_file_data, objfile); */
6496 add_psymbol_to_list (actual_name, strlen (actual_name),
6497 built_actual_name != NULL,
6498 VAR_DOMAIN, LOC_STATIC,
6499 &objfile->static_psymbols,
6501 cu->language, objfile);
6504 case DW_TAG_typedef:
6505 case DW_TAG_base_type:
6506 case DW_TAG_subrange_type:
6507 add_psymbol_to_list (actual_name, strlen (actual_name),
6508 built_actual_name != NULL,
6509 VAR_DOMAIN, LOC_TYPEDEF,
6510 &objfile->static_psymbols,
6511 0, (CORE_ADDR) 0, cu->language, objfile);
6513 case DW_TAG_namespace:
6514 add_psymbol_to_list (actual_name, strlen (actual_name),
6515 built_actual_name != NULL,
6516 VAR_DOMAIN, LOC_TYPEDEF,
6517 &objfile->global_psymbols,
6518 0, (CORE_ADDR) 0, cu->language, objfile);
6520 case DW_TAG_class_type:
6521 case DW_TAG_interface_type:
6522 case DW_TAG_structure_type:
6523 case DW_TAG_union_type:
6524 case DW_TAG_enumeration_type:
6525 /* Skip external references. The DWARF standard says in the section
6526 about "Structure, Union, and Class Type Entries": "An incomplete
6527 structure, union or class type is represented by a structure,
6528 union or class entry that does not have a byte size attribute
6529 and that has a DW_AT_declaration attribute." */
6530 if (!pdi->has_byte_size && pdi->is_declaration)
6532 xfree (built_actual_name);
6536 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6537 static vs. global. */
6538 add_psymbol_to_list (actual_name, strlen (actual_name),
6539 built_actual_name != NULL,
6540 STRUCT_DOMAIN, LOC_TYPEDEF,
6541 (cu->language == language_cplus
6542 || cu->language == language_java)
6543 ? &objfile->global_psymbols
6544 : &objfile->static_psymbols,
6545 0, (CORE_ADDR) 0, cu->language, objfile);
6548 case DW_TAG_enumerator:
6549 add_psymbol_to_list (actual_name, strlen (actual_name),
6550 built_actual_name != NULL,
6551 VAR_DOMAIN, LOC_CONST,
6552 (cu->language == language_cplus
6553 || cu->language == language_java)
6554 ? &objfile->global_psymbols
6555 : &objfile->static_psymbols,
6556 0, (CORE_ADDR) 0, cu->language, objfile);
6562 xfree (built_actual_name);
6565 /* Read a partial die corresponding to a namespace; also, add a symbol
6566 corresponding to that namespace to the symbol table. NAMESPACE is
6567 the name of the enclosing namespace. */
6570 add_partial_namespace (struct partial_die_info *pdi,
6571 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6572 int need_pc, struct dwarf2_cu *cu)
6574 /* Add a symbol for the namespace. */
6576 add_partial_symbol (pdi, cu);
6578 /* Now scan partial symbols in that namespace. */
6580 if (pdi->has_children)
6581 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6584 /* Read a partial die corresponding to a Fortran module. */
6587 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6588 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6590 /* Now scan partial symbols in that module. */
6592 if (pdi->has_children)
6593 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6596 /* Read a partial die corresponding to a subprogram and create a partial
6597 symbol for that subprogram. When the CU language allows it, this
6598 routine also defines a partial symbol for each nested subprogram
6599 that this subprogram contains.
6601 DIE my also be a lexical block, in which case we simply search
6602 recursively for suprograms defined inside that lexical block.
6603 Again, this is only performed when the CU language allows this
6604 type of definitions. */
6607 add_partial_subprogram (struct partial_die_info *pdi,
6608 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6609 int need_pc, struct dwarf2_cu *cu)
6611 if (pdi->tag == DW_TAG_subprogram)
6613 if (pdi->has_pc_info)
6615 if (pdi->lowpc < *lowpc)
6616 *lowpc = pdi->lowpc;
6617 if (pdi->highpc > *highpc)
6618 *highpc = pdi->highpc;
6622 struct objfile *objfile = cu->objfile;
6624 baseaddr = ANOFFSET (objfile->section_offsets,
6625 SECT_OFF_TEXT (objfile));
6626 addrmap_set_empty (objfile->psymtabs_addrmap,
6627 pdi->lowpc + baseaddr,
6628 pdi->highpc - 1 + baseaddr,
6629 cu->per_cu->v.psymtab);
6633 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6635 if (!pdi->is_declaration)
6636 /* Ignore subprogram DIEs that do not have a name, they are
6637 illegal. Do not emit a complaint at this point, we will
6638 do so when we convert this psymtab into a symtab. */
6640 add_partial_symbol (pdi, cu);
6644 if (! pdi->has_children)
6647 if (cu->language == language_ada)
6649 pdi = pdi->die_child;
6652 fixup_partial_die (pdi, cu);
6653 if (pdi->tag == DW_TAG_subprogram
6654 || pdi->tag == DW_TAG_lexical_block)
6655 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6656 pdi = pdi->die_sibling;
6661 /* Read a partial die corresponding to an enumeration type. */
6664 add_partial_enumeration (struct partial_die_info *enum_pdi,
6665 struct dwarf2_cu *cu)
6667 struct partial_die_info *pdi;
6669 if (enum_pdi->name != NULL)
6670 add_partial_symbol (enum_pdi, cu);
6672 pdi = enum_pdi->die_child;
6675 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6676 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6678 add_partial_symbol (pdi, cu);
6679 pdi = pdi->die_sibling;
6683 /* Return the initial uleb128 in the die at INFO_PTR. */
6686 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6688 unsigned int bytes_read;
6690 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6693 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6694 Return the corresponding abbrev, or NULL if the number is zero (indicating
6695 an empty DIE). In either case *BYTES_READ will be set to the length of
6696 the initial number. */
6698 static struct abbrev_info *
6699 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6700 struct dwarf2_cu *cu)
6702 bfd *abfd = cu->objfile->obfd;
6703 unsigned int abbrev_number;
6704 struct abbrev_info *abbrev;
6706 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6708 if (abbrev_number == 0)
6711 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6714 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6715 abbrev_number, bfd_get_filename (abfd));
6721 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6722 Returns a pointer to the end of a series of DIEs, terminated by an empty
6723 DIE. Any children of the skipped DIEs will also be skipped. */
6725 static const gdb_byte *
6726 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6728 struct dwarf2_cu *cu = reader->cu;
6729 struct abbrev_info *abbrev;
6730 unsigned int bytes_read;
6734 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6736 return info_ptr + bytes_read;
6738 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6742 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6743 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6744 abbrev corresponding to that skipped uleb128 should be passed in
6745 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6748 static const gdb_byte *
6749 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6750 struct abbrev_info *abbrev)
6752 unsigned int bytes_read;
6753 struct attribute attr;
6754 bfd *abfd = reader->abfd;
6755 struct dwarf2_cu *cu = reader->cu;
6756 const gdb_byte *buffer = reader->buffer;
6757 const gdb_byte *buffer_end = reader->buffer_end;
6758 const gdb_byte *start_info_ptr = info_ptr;
6759 unsigned int form, i;
6761 for (i = 0; i < abbrev->num_attrs; i++)
6763 /* The only abbrev we care about is DW_AT_sibling. */
6764 if (abbrev->attrs[i].name == DW_AT_sibling)
6766 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6767 if (attr.form == DW_FORM_ref_addr)
6768 complaint (&symfile_complaints,
6769 _("ignoring absolute DW_AT_sibling"));
6771 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6774 /* If it isn't DW_AT_sibling, skip this attribute. */
6775 form = abbrev->attrs[i].form;
6779 case DW_FORM_ref_addr:
6780 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6781 and later it is offset sized. */
6782 if (cu->header.version == 2)
6783 info_ptr += cu->header.addr_size;
6785 info_ptr += cu->header.offset_size;
6787 case DW_FORM_GNU_ref_alt:
6788 info_ptr += cu->header.offset_size;
6791 info_ptr += cu->header.addr_size;
6798 case DW_FORM_flag_present:
6810 case DW_FORM_ref_sig8:
6813 case DW_FORM_string:
6814 read_direct_string (abfd, info_ptr, &bytes_read);
6815 info_ptr += bytes_read;
6817 case DW_FORM_sec_offset:
6819 case DW_FORM_GNU_strp_alt:
6820 info_ptr += cu->header.offset_size;
6822 case DW_FORM_exprloc:
6824 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6825 info_ptr += bytes_read;
6827 case DW_FORM_block1:
6828 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6830 case DW_FORM_block2:
6831 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6833 case DW_FORM_block4:
6834 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6838 case DW_FORM_ref_udata:
6839 case DW_FORM_GNU_addr_index:
6840 case DW_FORM_GNU_str_index:
6841 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6843 case DW_FORM_indirect:
6844 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6845 info_ptr += bytes_read;
6846 /* We need to continue parsing from here, so just go back to
6848 goto skip_attribute;
6851 error (_("Dwarf Error: Cannot handle %s "
6852 "in DWARF reader [in module %s]"),
6853 dwarf_form_name (form),
6854 bfd_get_filename (abfd));
6858 if (abbrev->has_children)
6859 return skip_children (reader, info_ptr);
6864 /* Locate ORIG_PDI's sibling.
6865 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6867 static const gdb_byte *
6868 locate_pdi_sibling (const struct die_reader_specs *reader,
6869 struct partial_die_info *orig_pdi,
6870 const gdb_byte *info_ptr)
6872 /* Do we know the sibling already? */
6874 if (orig_pdi->sibling)
6875 return orig_pdi->sibling;
6877 /* Are there any children to deal with? */
6879 if (!orig_pdi->has_children)
6882 /* Skip the children the long way. */
6884 return skip_children (reader, info_ptr);
6887 /* Expand this partial symbol table into a full symbol table. SELF is
6891 dwarf2_read_symtab (struct partial_symtab *self,
6892 struct objfile *objfile)
6896 warning (_("bug: psymtab for %s is already read in."),
6903 printf_filtered (_("Reading in symbols for %s..."),
6905 gdb_flush (gdb_stdout);
6908 /* Restore our global data. */
6909 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6911 /* If this psymtab is constructed from a debug-only objfile, the
6912 has_section_at_zero flag will not necessarily be correct. We
6913 can get the correct value for this flag by looking at the data
6914 associated with the (presumably stripped) associated objfile. */
6915 if (objfile->separate_debug_objfile_backlink)
6917 struct dwarf2_per_objfile *dpo_backlink
6918 = objfile_data (objfile->separate_debug_objfile_backlink,
6919 dwarf2_objfile_data_key);
6921 dwarf2_per_objfile->has_section_at_zero
6922 = dpo_backlink->has_section_at_zero;
6925 dwarf2_per_objfile->reading_partial_symbols = 0;
6927 psymtab_to_symtab_1 (self);
6929 /* Finish up the debug error message. */
6931 printf_filtered (_("done.\n"));
6934 process_cu_includes ();
6937 /* Reading in full CUs. */
6939 /* Add PER_CU to the queue. */
6942 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6943 enum language pretend_language)
6945 struct dwarf2_queue_item *item;
6948 item = xmalloc (sizeof (*item));
6949 item->per_cu = per_cu;
6950 item->pretend_language = pretend_language;
6953 if (dwarf2_queue == NULL)
6954 dwarf2_queue = item;
6956 dwarf2_queue_tail->next = item;
6958 dwarf2_queue_tail = item;
6961 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6962 unit and add it to our queue.
6963 The result is non-zero if PER_CU was queued, otherwise the result is zero
6964 meaning either PER_CU is already queued or it is already loaded. */
6967 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6968 struct dwarf2_per_cu_data *per_cu,
6969 enum language pretend_language)
6971 /* We may arrive here during partial symbol reading, if we need full
6972 DIEs to process an unusual case (e.g. template arguments). Do
6973 not queue PER_CU, just tell our caller to load its DIEs. */
6974 if (dwarf2_per_objfile->reading_partial_symbols)
6976 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6981 /* Mark the dependence relation so that we don't flush PER_CU
6983 dwarf2_add_dependence (this_cu, per_cu);
6985 /* If it's already on the queue, we have nothing to do. */
6989 /* If the compilation unit is already loaded, just mark it as
6991 if (per_cu->cu != NULL)
6993 per_cu->cu->last_used = 0;
6997 /* Add it to the queue. */
6998 queue_comp_unit (per_cu, pretend_language);
7003 /* Process the queue. */
7006 process_queue (void)
7008 struct dwarf2_queue_item *item, *next_item;
7010 if (dwarf2_read_debug)
7012 fprintf_unfiltered (gdb_stdlog,
7013 "Expanding one or more symtabs of objfile %s ...\n",
7014 dwarf2_per_objfile->objfile->name);
7017 /* The queue starts out with one item, but following a DIE reference
7018 may load a new CU, adding it to the end of the queue. */
7019 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7021 if (dwarf2_per_objfile->using_index
7022 ? !item->per_cu->v.quick->symtab
7023 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7025 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7027 if (dwarf2_read_debug)
7029 fprintf_unfiltered (gdb_stdlog,
7030 "Expanding symtab of %s at offset 0x%x\n",
7031 per_cu->is_debug_types ? "TU" : "CU",
7032 per_cu->offset.sect_off);
7035 if (per_cu->is_debug_types)
7036 process_full_type_unit (per_cu, item->pretend_language);
7038 process_full_comp_unit (per_cu, item->pretend_language);
7040 if (dwarf2_read_debug)
7042 fprintf_unfiltered (gdb_stdlog,
7043 "Done expanding %s at offset 0x%x\n",
7044 per_cu->is_debug_types ? "TU" : "CU",
7045 per_cu->offset.sect_off);
7049 item->per_cu->queued = 0;
7050 next_item = item->next;
7054 dwarf2_queue_tail = NULL;
7056 if (dwarf2_read_debug)
7058 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7059 dwarf2_per_objfile->objfile->name);
7063 /* Free all allocated queue entries. This function only releases anything if
7064 an error was thrown; if the queue was processed then it would have been
7065 freed as we went along. */
7068 dwarf2_release_queue (void *dummy)
7070 struct dwarf2_queue_item *item, *last;
7072 item = dwarf2_queue;
7075 /* Anything still marked queued is likely to be in an
7076 inconsistent state, so discard it. */
7077 if (item->per_cu->queued)
7079 if (item->per_cu->cu != NULL)
7080 free_one_cached_comp_unit (item->per_cu);
7081 item->per_cu->queued = 0;
7089 dwarf2_queue = dwarf2_queue_tail = NULL;
7092 /* Read in full symbols for PST, and anything it depends on. */
7095 psymtab_to_symtab_1 (struct partial_symtab *pst)
7097 struct dwarf2_per_cu_data *per_cu;
7103 for (i = 0; i < pst->number_of_dependencies; i++)
7104 if (!pst->dependencies[i]->readin
7105 && pst->dependencies[i]->user == NULL)
7107 /* Inform about additional files that need to be read in. */
7110 /* FIXME: i18n: Need to make this a single string. */
7111 fputs_filtered (" ", gdb_stdout);
7113 fputs_filtered ("and ", gdb_stdout);
7115 printf_filtered ("%s...", pst->dependencies[i]->filename);
7116 wrap_here (""); /* Flush output. */
7117 gdb_flush (gdb_stdout);
7119 psymtab_to_symtab_1 (pst->dependencies[i]);
7122 per_cu = pst->read_symtab_private;
7126 /* It's an include file, no symbols to read for it.
7127 Everything is in the parent symtab. */
7132 dw2_do_instantiate_symtab (per_cu);
7135 /* Trivial hash function for die_info: the hash value of a DIE
7136 is its offset in .debug_info for this objfile. */
7139 die_hash (const void *item)
7141 const struct die_info *die = item;
7143 return die->offset.sect_off;
7146 /* Trivial comparison function for die_info structures: two DIEs
7147 are equal if they have the same offset. */
7150 die_eq (const void *item_lhs, const void *item_rhs)
7152 const struct die_info *die_lhs = item_lhs;
7153 const struct die_info *die_rhs = item_rhs;
7155 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7158 /* die_reader_func for load_full_comp_unit.
7159 This is identical to read_signatured_type_reader,
7160 but is kept separate for now. */
7163 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7164 const gdb_byte *info_ptr,
7165 struct die_info *comp_unit_die,
7169 struct dwarf2_cu *cu = reader->cu;
7170 enum language *language_ptr = data;
7172 gdb_assert (cu->die_hash == NULL);
7174 htab_create_alloc_ex (cu->header.length / 12,
7178 &cu->comp_unit_obstack,
7179 hashtab_obstack_allocate,
7180 dummy_obstack_deallocate);
7183 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7184 &info_ptr, comp_unit_die);
7185 cu->dies = comp_unit_die;
7186 /* comp_unit_die is not stored in die_hash, no need. */
7188 /* We try not to read any attributes in this function, because not
7189 all CUs needed for references have been loaded yet, and symbol
7190 table processing isn't initialized. But we have to set the CU language,
7191 or we won't be able to build types correctly.
7192 Similarly, if we do not read the producer, we can not apply
7193 producer-specific interpretation. */
7194 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7197 /* Load the DIEs associated with PER_CU into memory. */
7200 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7201 enum language pretend_language)
7203 gdb_assert (! this_cu->is_debug_types);
7205 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7206 load_full_comp_unit_reader, &pretend_language);
7209 /* Add a DIE to the delayed physname list. */
7212 add_to_method_list (struct type *type, int fnfield_index, int index,
7213 const char *name, struct die_info *die,
7214 struct dwarf2_cu *cu)
7216 struct delayed_method_info mi;
7218 mi.fnfield_index = fnfield_index;
7222 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7225 /* A cleanup for freeing the delayed method list. */
7228 free_delayed_list (void *ptr)
7230 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7231 if (cu->method_list != NULL)
7233 VEC_free (delayed_method_info, cu->method_list);
7234 cu->method_list = NULL;
7238 /* Compute the physnames of any methods on the CU's method list.
7240 The computation of method physnames is delayed in order to avoid the
7241 (bad) condition that one of the method's formal parameters is of an as yet
7245 compute_delayed_physnames (struct dwarf2_cu *cu)
7248 struct delayed_method_info *mi;
7249 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7251 const char *physname;
7252 struct fn_fieldlist *fn_flp
7253 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7254 physname = dwarf2_physname (mi->name, mi->die, cu);
7255 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7259 /* Go objects should be embedded in a DW_TAG_module DIE,
7260 and it's not clear if/how imported objects will appear.
7261 To keep Go support simple until that's worked out,
7262 go back through what we've read and create something usable.
7263 We could do this while processing each DIE, and feels kinda cleaner,
7264 but that way is more invasive.
7265 This is to, for example, allow the user to type "p var" or "b main"
7266 without having to specify the package name, and allow lookups
7267 of module.object to work in contexts that use the expression
7271 fixup_go_packaging (struct dwarf2_cu *cu)
7273 char *package_name = NULL;
7274 struct pending *list;
7277 for (list = global_symbols; list != NULL; list = list->next)
7279 for (i = 0; i < list->nsyms; ++i)
7281 struct symbol *sym = list->symbol[i];
7283 if (SYMBOL_LANGUAGE (sym) == language_go
7284 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7286 char *this_package_name = go_symbol_package_name (sym);
7288 if (this_package_name == NULL)
7290 if (package_name == NULL)
7291 package_name = this_package_name;
7294 if (strcmp (package_name, this_package_name) != 0)
7295 complaint (&symfile_complaints,
7296 _("Symtab %s has objects from two different Go packages: %s and %s"),
7297 (SYMBOL_SYMTAB (sym)
7298 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7299 : cu->objfile->name),
7300 this_package_name, package_name);
7301 xfree (this_package_name);
7307 if (package_name != NULL)
7309 struct objfile *objfile = cu->objfile;
7310 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7312 strlen (package_name));
7313 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7314 saved_package_name, objfile);
7317 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7319 sym = allocate_symbol (objfile);
7320 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7321 SYMBOL_SET_NAMES (sym, saved_package_name,
7322 strlen (saved_package_name), 0, objfile);
7323 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7324 e.g., "main" finds the "main" module and not C's main(). */
7325 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7326 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7327 SYMBOL_TYPE (sym) = type;
7329 add_symbol_to_list (sym, &global_symbols);
7331 xfree (package_name);
7335 /* Return the symtab for PER_CU. This works properly regardless of
7336 whether we're using the index or psymtabs. */
7338 static struct symtab *
7339 get_symtab (struct dwarf2_per_cu_data *per_cu)
7341 return (dwarf2_per_objfile->using_index
7342 ? per_cu->v.quick->symtab
7343 : per_cu->v.psymtab->symtab);
7346 /* A helper function for computing the list of all symbol tables
7347 included by PER_CU. */
7350 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
7351 htab_t all_children,
7352 struct dwarf2_per_cu_data *per_cu)
7356 struct dwarf2_per_cu_data *iter;
7358 slot = htab_find_slot (all_children, per_cu, INSERT);
7361 /* This inclusion and its children have been processed. */
7366 /* Only add a CU if it has a symbol table. */
7367 if (get_symtab (per_cu) != NULL)
7368 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
7371 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7373 recursively_compute_inclusions (result, all_children, iter);
7376 /* Compute the symtab 'includes' fields for the symtab related to
7380 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7382 gdb_assert (! per_cu->is_debug_types);
7384 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7387 struct dwarf2_per_cu_data *iter;
7388 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
7389 htab_t all_children;
7390 struct symtab *symtab = get_symtab (per_cu);
7392 /* If we don't have a symtab, we can just skip this case. */
7396 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7397 NULL, xcalloc, xfree);
7400 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7403 recursively_compute_inclusions (&result_children, all_children, iter);
7405 /* Now we have a transitive closure of all the included CUs, and
7406 for .gdb_index version 7 the included TUs, so we can convert it
7407 to a list of symtabs. */
7408 len = VEC_length (dwarf2_per_cu_ptr, result_children);
7410 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7411 (len + 1) * sizeof (struct symtab *));
7413 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
7415 symtab->includes[ix] = get_symtab (iter);
7416 symtab->includes[len] = NULL;
7418 VEC_free (dwarf2_per_cu_ptr, result_children);
7419 htab_delete (all_children);
7423 /* Compute the 'includes' field for the symtabs of all the CUs we just
7427 process_cu_includes (void)
7430 struct dwarf2_per_cu_data *iter;
7433 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7437 if (! iter->is_debug_types)
7438 compute_symtab_includes (iter);
7441 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7444 /* Generate full symbol information for PER_CU, whose DIEs have
7445 already been loaded into memory. */
7448 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7449 enum language pretend_language)
7451 struct dwarf2_cu *cu = per_cu->cu;
7452 struct objfile *objfile = per_cu->objfile;
7453 CORE_ADDR lowpc, highpc;
7454 struct symtab *symtab;
7455 struct cleanup *back_to, *delayed_list_cleanup;
7457 struct block *static_block;
7459 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7462 back_to = make_cleanup (really_free_pendings, NULL);
7463 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7465 cu->list_in_scope = &file_symbols;
7467 cu->language = pretend_language;
7468 cu->language_defn = language_def (cu->language);
7470 /* Do line number decoding in read_file_scope () */
7471 process_die (cu->dies, cu);
7473 /* For now fudge the Go package. */
7474 if (cu->language == language_go)
7475 fixup_go_packaging (cu);
7477 /* Now that we have processed all the DIEs in the CU, all the types
7478 should be complete, and it should now be safe to compute all of the
7480 compute_delayed_physnames (cu);
7481 do_cleanups (delayed_list_cleanup);
7483 /* Some compilers don't define a DW_AT_high_pc attribute for the
7484 compilation unit. If the DW_AT_high_pc is missing, synthesize
7485 it, by scanning the DIE's below the compilation unit. */
7486 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7489 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7491 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7492 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7493 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7494 addrmap to help ensure it has an accurate map of pc values belonging to
7496 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7498 symtab = end_symtab_from_static_block (static_block, objfile,
7499 SECT_OFF_TEXT (objfile), 0);
7503 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7505 /* Set symtab language to language from DW_AT_language. If the
7506 compilation is from a C file generated by language preprocessors, do
7507 not set the language if it was already deduced by start_subfile. */
7508 if (!(cu->language == language_c && symtab->language != language_c))
7509 symtab->language = cu->language;
7511 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7512 produce DW_AT_location with location lists but it can be possibly
7513 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7514 there were bugs in prologue debug info, fixed later in GCC-4.5
7515 by "unwind info for epilogues" patch (which is not directly related).
7517 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7518 needed, it would be wrong due to missing DW_AT_producer there.
7520 Still one can confuse GDB by using non-standard GCC compilation
7521 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7523 if (cu->has_loclist && gcc_4_minor >= 5)
7524 symtab->locations_valid = 1;
7526 if (gcc_4_minor >= 5)
7527 symtab->epilogue_unwind_valid = 1;
7529 symtab->call_site_htab = cu->call_site_htab;
7532 if (dwarf2_per_objfile->using_index)
7533 per_cu->v.quick->symtab = symtab;
7536 struct partial_symtab *pst = per_cu->v.psymtab;
7537 pst->symtab = symtab;
7541 /* Push it for inclusion processing later. */
7542 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7544 do_cleanups (back_to);
7547 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7548 already been loaded into memory. */
7551 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7552 enum language pretend_language)
7554 struct dwarf2_cu *cu = per_cu->cu;
7555 struct objfile *objfile = per_cu->objfile;
7556 struct symtab *symtab;
7557 struct cleanup *back_to, *delayed_list_cleanup;
7558 struct signatured_type *sig_type;
7560 gdb_assert (per_cu->is_debug_types);
7561 sig_type = (struct signatured_type *) per_cu;
7564 back_to = make_cleanup (really_free_pendings, NULL);
7565 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7567 cu->list_in_scope = &file_symbols;
7569 cu->language = pretend_language;
7570 cu->language_defn = language_def (cu->language);
7572 /* The symbol tables are set up in read_type_unit_scope. */
7573 process_die (cu->dies, cu);
7575 /* For now fudge the Go package. */
7576 if (cu->language == language_go)
7577 fixup_go_packaging (cu);
7579 /* Now that we have processed all the DIEs in the CU, all the types
7580 should be complete, and it should now be safe to compute all of the
7582 compute_delayed_physnames (cu);
7583 do_cleanups (delayed_list_cleanup);
7585 /* TUs share symbol tables.
7586 If this is the first TU to use this symtab, complete the construction
7587 of it with end_expandable_symtab. Otherwise, complete the addition of
7588 this TU's symbols to the existing symtab. */
7589 if (sig_type->type_unit_group->primary_symtab == NULL)
7591 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7592 sig_type->type_unit_group->primary_symtab = symtab;
7596 /* Set symtab language to language from DW_AT_language. If the
7597 compilation is from a C file generated by language preprocessors,
7598 do not set the language if it was already deduced by
7600 if (!(cu->language == language_c && symtab->language != language_c))
7601 symtab->language = cu->language;
7606 augment_type_symtab (objfile,
7607 sig_type->type_unit_group->primary_symtab);
7608 symtab = sig_type->type_unit_group->primary_symtab;
7611 if (dwarf2_per_objfile->using_index)
7612 per_cu->v.quick->symtab = symtab;
7615 struct partial_symtab *pst = per_cu->v.psymtab;
7616 pst->symtab = symtab;
7620 do_cleanups (back_to);
7623 /* Process an imported unit DIE. */
7626 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7628 struct attribute *attr;
7630 /* For now we don't handle imported units in type units. */
7631 if (cu->per_cu->is_debug_types)
7633 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7634 " supported in type units [in module %s]"),
7638 attr = dwarf2_attr (die, DW_AT_import, cu);
7641 struct dwarf2_per_cu_data *per_cu;
7642 struct symtab *imported_symtab;
7646 offset = dwarf2_get_ref_die_offset (attr);
7647 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7648 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7650 /* Queue the unit, if needed. */
7651 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7652 load_full_comp_unit (per_cu, cu->language);
7654 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7659 /* Process a die and its children. */
7662 process_die (struct die_info *die, struct dwarf2_cu *cu)
7666 case DW_TAG_padding:
7668 case DW_TAG_compile_unit:
7669 case DW_TAG_partial_unit:
7670 read_file_scope (die, cu);
7672 case DW_TAG_type_unit:
7673 read_type_unit_scope (die, cu);
7675 case DW_TAG_subprogram:
7676 case DW_TAG_inlined_subroutine:
7677 read_func_scope (die, cu);
7679 case DW_TAG_lexical_block:
7680 case DW_TAG_try_block:
7681 case DW_TAG_catch_block:
7682 read_lexical_block_scope (die, cu);
7684 case DW_TAG_GNU_call_site:
7685 read_call_site_scope (die, cu);
7687 case DW_TAG_class_type:
7688 case DW_TAG_interface_type:
7689 case DW_TAG_structure_type:
7690 case DW_TAG_union_type:
7691 process_structure_scope (die, cu);
7693 case DW_TAG_enumeration_type:
7694 process_enumeration_scope (die, cu);
7697 /* These dies have a type, but processing them does not create
7698 a symbol or recurse to process the children. Therefore we can
7699 read them on-demand through read_type_die. */
7700 case DW_TAG_subroutine_type:
7701 case DW_TAG_set_type:
7702 case DW_TAG_array_type:
7703 case DW_TAG_pointer_type:
7704 case DW_TAG_ptr_to_member_type:
7705 case DW_TAG_reference_type:
7706 case DW_TAG_string_type:
7709 case DW_TAG_base_type:
7710 case DW_TAG_subrange_type:
7711 case DW_TAG_typedef:
7712 /* Add a typedef symbol for the type definition, if it has a
7714 new_symbol (die, read_type_die (die, cu), cu);
7716 case DW_TAG_common_block:
7717 read_common_block (die, cu);
7719 case DW_TAG_common_inclusion:
7721 case DW_TAG_namespace:
7722 cu->processing_has_namespace_info = 1;
7723 read_namespace (die, cu);
7726 cu->processing_has_namespace_info = 1;
7727 read_module (die, cu);
7729 case DW_TAG_imported_declaration:
7730 case DW_TAG_imported_module:
7731 cu->processing_has_namespace_info = 1;
7732 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7733 || cu->language != language_fortran))
7734 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7735 dwarf_tag_name (die->tag));
7736 read_import_statement (die, cu);
7739 case DW_TAG_imported_unit:
7740 process_imported_unit_die (die, cu);
7744 new_symbol (die, NULL, cu);
7749 /* DWARF name computation. */
7751 /* A helper function for dwarf2_compute_name which determines whether DIE
7752 needs to have the name of the scope prepended to the name listed in the
7756 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7758 struct attribute *attr;
7762 case DW_TAG_namespace:
7763 case DW_TAG_typedef:
7764 case DW_TAG_class_type:
7765 case DW_TAG_interface_type:
7766 case DW_TAG_structure_type:
7767 case DW_TAG_union_type:
7768 case DW_TAG_enumeration_type:
7769 case DW_TAG_enumerator:
7770 case DW_TAG_subprogram:
7774 case DW_TAG_variable:
7775 case DW_TAG_constant:
7776 /* We only need to prefix "globally" visible variables. These include
7777 any variable marked with DW_AT_external or any variable that
7778 lives in a namespace. [Variables in anonymous namespaces
7779 require prefixing, but they are not DW_AT_external.] */
7781 if (dwarf2_attr (die, DW_AT_specification, cu))
7783 struct dwarf2_cu *spec_cu = cu;
7785 return die_needs_namespace (die_specification (die, &spec_cu),
7789 attr = dwarf2_attr (die, DW_AT_external, cu);
7790 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7791 && die->parent->tag != DW_TAG_module)
7793 /* A variable in a lexical block of some kind does not need a
7794 namespace, even though in C++ such variables may be external
7795 and have a mangled name. */
7796 if (die->parent->tag == DW_TAG_lexical_block
7797 || die->parent->tag == DW_TAG_try_block
7798 || die->parent->tag == DW_TAG_catch_block
7799 || die->parent->tag == DW_TAG_subprogram)
7808 /* Retrieve the last character from a mem_file. */
7811 do_ui_file_peek_last (void *object, const char *buffer, long length)
7813 char *last_char_p = (char *) object;
7816 *last_char_p = buffer[length - 1];
7819 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7820 compute the physname for the object, which include a method's:
7821 - formal parameters (C++/Java),
7822 - receiver type (Go),
7823 - return type (Java).
7825 The term "physname" is a bit confusing.
7826 For C++, for example, it is the demangled name.
7827 For Go, for example, it's the mangled name.
7829 For Ada, return the DIE's linkage name rather than the fully qualified
7830 name. PHYSNAME is ignored..
7832 The result is allocated on the objfile_obstack and canonicalized. */
7835 dwarf2_compute_name (const char *name,
7836 struct die_info *die, struct dwarf2_cu *cu,
7839 struct objfile *objfile = cu->objfile;
7842 name = dwarf2_name (die, cu);
7844 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7845 compute it by typename_concat inside GDB. */
7846 if (cu->language == language_ada
7847 || (cu->language == language_fortran && physname))
7849 /* For Ada unit, we prefer the linkage name over the name, as
7850 the former contains the exported name, which the user expects
7851 to be able to reference. Ideally, we want the user to be able
7852 to reference this entity using either natural or linkage name,
7853 but we haven't started looking at this enhancement yet. */
7854 struct attribute *attr;
7856 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7858 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7859 if (attr && DW_STRING (attr))
7860 return DW_STRING (attr);
7863 /* These are the only languages we know how to qualify names in. */
7865 && (cu->language == language_cplus || cu->language == language_java
7866 || cu->language == language_fortran))
7868 if (die_needs_namespace (die, cu))
7872 struct ui_file *buf;
7874 prefix = determine_prefix (die, cu);
7875 buf = mem_fileopen ();
7876 if (*prefix != '\0')
7878 char *prefixed_name = typename_concat (NULL, prefix, name,
7881 fputs_unfiltered (prefixed_name, buf);
7882 xfree (prefixed_name);
7885 fputs_unfiltered (name, buf);
7887 /* Template parameters may be specified in the DIE's DW_AT_name, or
7888 as children with DW_TAG_template_type_param or
7889 DW_TAG_value_type_param. If the latter, add them to the name
7890 here. If the name already has template parameters, then
7891 skip this step; some versions of GCC emit both, and
7892 it is more efficient to use the pre-computed name.
7894 Something to keep in mind about this process: it is very
7895 unlikely, or in some cases downright impossible, to produce
7896 something that will match the mangled name of a function.
7897 If the definition of the function has the same debug info,
7898 we should be able to match up with it anyway. But fallbacks
7899 using the minimal symbol, for instance to find a method
7900 implemented in a stripped copy of libstdc++, will not work.
7901 If we do not have debug info for the definition, we will have to
7902 match them up some other way.
7904 When we do name matching there is a related problem with function
7905 templates; two instantiated function templates are allowed to
7906 differ only by their return types, which we do not add here. */
7908 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7910 struct attribute *attr;
7911 struct die_info *child;
7914 die->building_fullname = 1;
7916 for (child = die->child; child != NULL; child = child->sibling)
7920 const gdb_byte *bytes;
7921 struct dwarf2_locexpr_baton *baton;
7924 if (child->tag != DW_TAG_template_type_param
7925 && child->tag != DW_TAG_template_value_param)
7930 fputs_unfiltered ("<", buf);
7934 fputs_unfiltered (", ", buf);
7936 attr = dwarf2_attr (child, DW_AT_type, cu);
7939 complaint (&symfile_complaints,
7940 _("template parameter missing DW_AT_type"));
7941 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7944 type = die_type (child, cu);
7946 if (child->tag == DW_TAG_template_type_param)
7948 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7952 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7955 complaint (&symfile_complaints,
7956 _("template parameter missing "
7957 "DW_AT_const_value"));
7958 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7962 dwarf2_const_value_attr (attr, type, name,
7963 &cu->comp_unit_obstack, cu,
7964 &value, &bytes, &baton);
7966 if (TYPE_NOSIGN (type))
7967 /* GDB prints characters as NUMBER 'CHAR'. If that's
7968 changed, this can use value_print instead. */
7969 c_printchar (value, type, buf);
7972 struct value_print_options opts;
7975 v = dwarf2_evaluate_loc_desc (type, NULL,
7979 else if (bytes != NULL)
7981 v = allocate_value (type);
7982 memcpy (value_contents_writeable (v), bytes,
7983 TYPE_LENGTH (type));
7986 v = value_from_longest (type, value);
7988 /* Specify decimal so that we do not depend on
7990 get_formatted_print_options (&opts, 'd');
7992 value_print (v, buf, &opts);
7998 die->building_fullname = 0;
8002 /* Close the argument list, with a space if necessary
8003 (nested templates). */
8004 char last_char = '\0';
8005 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8006 if (last_char == '>')
8007 fputs_unfiltered (" >", buf);
8009 fputs_unfiltered (">", buf);
8013 /* For Java and C++ methods, append formal parameter type
8014 information, if PHYSNAME. */
8016 if (physname && die->tag == DW_TAG_subprogram
8017 && (cu->language == language_cplus
8018 || cu->language == language_java))
8020 struct type *type = read_type_die (die, cu);
8022 c_type_print_args (type, buf, 1, cu->language,
8023 &type_print_raw_options);
8025 if (cu->language == language_java)
8027 /* For java, we must append the return type to method
8029 if (die->tag == DW_TAG_subprogram)
8030 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8031 0, 0, &type_print_raw_options);
8033 else if (cu->language == language_cplus)
8035 /* Assume that an artificial first parameter is
8036 "this", but do not crash if it is not. RealView
8037 marks unnamed (and thus unused) parameters as
8038 artificial; there is no way to differentiate
8040 if (TYPE_NFIELDS (type) > 0
8041 && TYPE_FIELD_ARTIFICIAL (type, 0)
8042 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8043 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8045 fputs_unfiltered (" const", buf);
8049 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8051 ui_file_delete (buf);
8053 if (cu->language == language_cplus)
8056 = dwarf2_canonicalize_name (name, cu,
8057 &objfile->objfile_obstack);
8068 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8069 If scope qualifiers are appropriate they will be added. The result
8070 will be allocated on the objfile_obstack, or NULL if the DIE does
8071 not have a name. NAME may either be from a previous call to
8072 dwarf2_name or NULL.
8074 The output string will be canonicalized (if C++/Java). */
8077 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8079 return dwarf2_compute_name (name, die, cu, 0);
8082 /* Construct a physname for the given DIE in CU. NAME may either be
8083 from a previous call to dwarf2_name or NULL. The result will be
8084 allocated on the objfile_objstack or NULL if the DIE does not have a
8087 The output string will be canonicalized (if C++/Java). */
8090 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8092 struct objfile *objfile = cu->objfile;
8093 struct attribute *attr;
8094 const char *retval, *mangled = NULL, *canon = NULL;
8095 struct cleanup *back_to;
8098 /* In this case dwarf2_compute_name is just a shortcut not building anything
8100 if (!die_needs_namespace (die, cu))
8101 return dwarf2_compute_name (name, die, cu, 1);
8103 back_to = make_cleanup (null_cleanup, NULL);
8105 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8107 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8109 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8111 if (attr && DW_STRING (attr))
8115 mangled = DW_STRING (attr);
8117 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8118 type. It is easier for GDB users to search for such functions as
8119 `name(params)' than `long name(params)'. In such case the minimal
8120 symbol names do not match the full symbol names but for template
8121 functions there is never a need to look up their definition from their
8122 declaration so the only disadvantage remains the minimal symbol
8123 variant `long name(params)' does not have the proper inferior type.
8126 if (cu->language == language_go)
8128 /* This is a lie, but we already lie to the caller new_symbol_full.
8129 new_symbol_full assumes we return the mangled name.
8130 This just undoes that lie until things are cleaned up. */
8135 demangled = gdb_demangle (mangled,
8136 (DMGL_PARAMS | DMGL_ANSI
8137 | (cu->language == language_java
8138 ? DMGL_JAVA | DMGL_RET_POSTFIX
8143 make_cleanup (xfree, demangled);
8153 if (canon == NULL || check_physname)
8155 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8157 if (canon != NULL && strcmp (physname, canon) != 0)
8159 /* It may not mean a bug in GDB. The compiler could also
8160 compute DW_AT_linkage_name incorrectly. But in such case
8161 GDB would need to be bug-to-bug compatible. */
8163 complaint (&symfile_complaints,
8164 _("Computed physname <%s> does not match demangled <%s> "
8165 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8166 physname, canon, mangled, die->offset.sect_off, objfile->name);
8168 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8169 is available here - over computed PHYSNAME. It is safer
8170 against both buggy GDB and buggy compilers. */
8184 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8186 do_cleanups (back_to);
8190 /* Read the import statement specified by the given die and record it. */
8193 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8195 struct objfile *objfile = cu->objfile;
8196 struct attribute *import_attr;
8197 struct die_info *imported_die, *child_die;
8198 struct dwarf2_cu *imported_cu;
8199 const char *imported_name;
8200 const char *imported_name_prefix;
8201 const char *canonical_name;
8202 const char *import_alias;
8203 const char *imported_declaration = NULL;
8204 const char *import_prefix;
8205 VEC (const_char_ptr) *excludes = NULL;
8206 struct cleanup *cleanups;
8208 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8209 if (import_attr == NULL)
8211 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8212 dwarf_tag_name (die->tag));
8217 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8218 imported_name = dwarf2_name (imported_die, imported_cu);
8219 if (imported_name == NULL)
8221 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8223 The import in the following code:
8237 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8238 <52> DW_AT_decl_file : 1
8239 <53> DW_AT_decl_line : 6
8240 <54> DW_AT_import : <0x75>
8241 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8243 <5b> DW_AT_decl_file : 1
8244 <5c> DW_AT_decl_line : 2
8245 <5d> DW_AT_type : <0x6e>
8247 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8248 <76> DW_AT_byte_size : 4
8249 <77> DW_AT_encoding : 5 (signed)
8251 imports the wrong die ( 0x75 instead of 0x58 ).
8252 This case will be ignored until the gcc bug is fixed. */
8256 /* Figure out the local name after import. */
8257 import_alias = dwarf2_name (die, cu);
8259 /* Figure out where the statement is being imported to. */
8260 import_prefix = determine_prefix (die, cu);
8262 /* Figure out what the scope of the imported die is and prepend it
8263 to the name of the imported die. */
8264 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8266 if (imported_die->tag != DW_TAG_namespace
8267 && imported_die->tag != DW_TAG_module)
8269 imported_declaration = imported_name;
8270 canonical_name = imported_name_prefix;
8272 else if (strlen (imported_name_prefix) > 0)
8273 canonical_name = obconcat (&objfile->objfile_obstack,
8274 imported_name_prefix, "::", imported_name,
8277 canonical_name = imported_name;
8279 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8281 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8282 for (child_die = die->child; child_die && child_die->tag;
8283 child_die = sibling_die (child_die))
8285 /* DWARF-4: A Fortran use statement with a “rename list” may be
8286 represented by an imported module entry with an import attribute
8287 referring to the module and owned entries corresponding to those
8288 entities that are renamed as part of being imported. */
8290 if (child_die->tag != DW_TAG_imported_declaration)
8292 complaint (&symfile_complaints,
8293 _("child DW_TAG_imported_declaration expected "
8294 "- DIE at 0x%x [in module %s]"),
8295 child_die->offset.sect_off, objfile->name);
8299 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8300 if (import_attr == NULL)
8302 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8303 dwarf_tag_name (child_die->tag));
8308 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8310 imported_name = dwarf2_name (imported_die, imported_cu);
8311 if (imported_name == NULL)
8313 complaint (&symfile_complaints,
8314 _("child DW_TAG_imported_declaration has unknown "
8315 "imported name - DIE at 0x%x [in module %s]"),
8316 child_die->offset.sect_off, objfile->name);
8320 VEC_safe_push (const_char_ptr, excludes, imported_name);
8322 process_die (child_die, cu);
8325 cp_add_using_directive (import_prefix,
8328 imported_declaration,
8331 &objfile->objfile_obstack);
8333 do_cleanups (cleanups);
8336 /* Cleanup function for handle_DW_AT_stmt_list. */
8339 free_cu_line_header (void *arg)
8341 struct dwarf2_cu *cu = arg;
8343 free_line_header (cu->line_header);
8344 cu->line_header = NULL;
8347 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8348 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8349 this, it was first present in GCC release 4.3.0. */
8352 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8354 if (!cu->checked_producer)
8355 check_producer (cu);
8357 return cu->producer_is_gcc_lt_4_3;
8361 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8362 const char **name, const char **comp_dir)
8364 struct attribute *attr;
8369 /* Find the filename. Do not use dwarf2_name here, since the filename
8370 is not a source language identifier. */
8371 attr = dwarf2_attr (die, DW_AT_name, cu);
8374 *name = DW_STRING (attr);
8377 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8379 *comp_dir = DW_STRING (attr);
8380 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8381 && IS_ABSOLUTE_PATH (*name))
8383 char *d = ldirname (*name);
8387 make_cleanup (xfree, d);
8389 if (*comp_dir != NULL)
8391 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8392 directory, get rid of it. */
8393 char *cp = strchr (*comp_dir, ':');
8395 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8400 *name = "<unknown>";
8403 /* Handle DW_AT_stmt_list for a compilation unit.
8404 DIE is the DW_TAG_compile_unit die for CU.
8405 COMP_DIR is the compilation directory.
8406 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8409 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8410 const char *comp_dir) /* ARI: editCase function */
8412 struct attribute *attr;
8414 gdb_assert (! cu->per_cu->is_debug_types);
8416 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8419 unsigned int line_offset = DW_UNSND (attr);
8420 struct line_header *line_header
8421 = dwarf_decode_line_header (line_offset, cu);
8425 cu->line_header = line_header;
8426 make_cleanup (free_cu_line_header, cu);
8427 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8432 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8435 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8437 struct objfile *objfile = dwarf2_per_objfile->objfile;
8438 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8439 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8440 CORE_ADDR highpc = ((CORE_ADDR) 0);
8441 struct attribute *attr;
8442 const char *name = NULL;
8443 const char *comp_dir = NULL;
8444 struct die_info *child_die;
8445 bfd *abfd = objfile->obfd;
8448 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8450 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8452 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8453 from finish_block. */
8454 if (lowpc == ((CORE_ADDR) -1))
8459 find_file_and_directory (die, cu, &name, &comp_dir);
8461 prepare_one_comp_unit (cu, die, cu->language);
8463 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8464 standardised yet. As a workaround for the language detection we fall
8465 back to the DW_AT_producer string. */
8466 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8467 cu->language = language_opencl;
8469 /* Similar hack for Go. */
8470 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8471 set_cu_language (DW_LANG_Go, cu);
8473 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8475 /* Decode line number information if present. We do this before
8476 processing child DIEs, so that the line header table is available
8477 for DW_AT_decl_file. */
8478 handle_DW_AT_stmt_list (die, cu, comp_dir);
8480 /* Process all dies in compilation unit. */
8481 if (die->child != NULL)
8483 child_die = die->child;
8484 while (child_die && child_die->tag)
8486 process_die (child_die, cu);
8487 child_die = sibling_die (child_die);
8491 /* Decode macro information, if present. Dwarf 2 macro information
8492 refers to information in the line number info statement program
8493 header, so we can only read it if we've read the header
8495 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8496 if (attr && cu->line_header)
8498 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8499 complaint (&symfile_complaints,
8500 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8502 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8506 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8507 if (attr && cu->line_header)
8509 unsigned int macro_offset = DW_UNSND (attr);
8511 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8515 do_cleanups (back_to);
8518 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8519 Create the set of symtabs used by this TU, or if this TU is sharing
8520 symtabs with another TU and the symtabs have already been created
8521 then restore those symtabs in the line header.
8522 We don't need the pc/line-number mapping for type units. */
8525 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8527 struct objfile *objfile = dwarf2_per_objfile->objfile;
8528 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8529 struct type_unit_group *tu_group;
8531 struct line_header *lh;
8532 struct attribute *attr;
8533 unsigned int i, line_offset;
8534 struct signatured_type *sig_type;
8536 gdb_assert (per_cu->is_debug_types);
8537 sig_type = (struct signatured_type *) per_cu;
8539 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8541 /* If we're using .gdb_index (includes -readnow) then
8542 per_cu->type_unit_group may not have been set up yet. */
8543 if (sig_type->type_unit_group == NULL)
8544 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8545 tu_group = sig_type->type_unit_group;
8547 /* If we've already processed this stmt_list there's no real need to
8548 do it again, we could fake it and just recreate the part we need
8549 (file name,index -> symtab mapping). If data shows this optimization
8550 is useful we can do it then. */
8551 first_time = tu_group->primary_symtab == NULL;
8553 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8558 line_offset = DW_UNSND (attr);
8559 lh = dwarf_decode_line_header (line_offset, cu);
8564 dwarf2_start_symtab (cu, "", NULL, 0);
8567 gdb_assert (tu_group->symtabs == NULL);
8570 /* Note: The primary symtab will get allocated at the end. */
8574 cu->line_header = lh;
8575 make_cleanup (free_cu_line_header, cu);
8579 dwarf2_start_symtab (cu, "", NULL, 0);
8581 tu_group->num_symtabs = lh->num_file_names;
8582 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8584 for (i = 0; i < lh->num_file_names; ++i)
8586 const char *dir = NULL;
8587 struct file_entry *fe = &lh->file_names[i];
8590 dir = lh->include_dirs[fe->dir_index - 1];
8591 dwarf2_start_subfile (fe->name, dir, NULL);
8593 /* Note: We don't have to watch for the main subfile here, type units
8594 don't have DW_AT_name. */
8596 if (current_subfile->symtab == NULL)
8598 /* NOTE: start_subfile will recognize when it's been passed
8599 a file it has already seen. So we can't assume there's a
8600 simple mapping from lh->file_names to subfiles,
8601 lh->file_names may contain dups. */
8602 current_subfile->symtab = allocate_symtab (current_subfile->name,
8606 fe->symtab = current_subfile->symtab;
8607 tu_group->symtabs[i] = fe->symtab;
8614 for (i = 0; i < lh->num_file_names; ++i)
8616 struct file_entry *fe = &lh->file_names[i];
8618 fe->symtab = tu_group->symtabs[i];
8622 /* The main symtab is allocated last. Type units don't have DW_AT_name
8623 so they don't have a "real" (so to speak) symtab anyway.
8624 There is later code that will assign the main symtab to all symbols
8625 that don't have one. We need to handle the case of a symbol with a
8626 missing symtab (DW_AT_decl_file) anyway. */
8629 /* Process DW_TAG_type_unit.
8630 For TUs we want to skip the first top level sibling if it's not the
8631 actual type being defined by this TU. In this case the first top
8632 level sibling is there to provide context only. */
8635 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8637 struct die_info *child_die;
8639 prepare_one_comp_unit (cu, die, language_minimal);
8641 /* Initialize (or reinitialize) the machinery for building symtabs.
8642 We do this before processing child DIEs, so that the line header table
8643 is available for DW_AT_decl_file. */
8644 setup_type_unit_groups (die, cu);
8646 if (die->child != NULL)
8648 child_die = die->child;
8649 while (child_die && child_die->tag)
8651 process_die (child_die, cu);
8652 child_die = sibling_die (child_die);
8659 http://gcc.gnu.org/wiki/DebugFission
8660 http://gcc.gnu.org/wiki/DebugFissionDWP
8662 To simplify handling of both DWO files ("object" files with the DWARF info)
8663 and DWP files (a file with the DWOs packaged up into one file), we treat
8664 DWP files as having a collection of virtual DWO files. */
8667 hash_dwo_file (const void *item)
8669 const struct dwo_file *dwo_file = item;
8672 hash = htab_hash_string (dwo_file->dwo_name);
8673 if (dwo_file->comp_dir != NULL)
8674 hash += htab_hash_string (dwo_file->comp_dir);
8679 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8681 const struct dwo_file *lhs = item_lhs;
8682 const struct dwo_file *rhs = item_rhs;
8684 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
8686 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
8687 return lhs->comp_dir == rhs->comp_dir;
8688 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
8691 /* Allocate a hash table for DWO files. */
8694 allocate_dwo_file_hash_table (void)
8696 struct objfile *objfile = dwarf2_per_objfile->objfile;
8698 return htab_create_alloc_ex (41,
8702 &objfile->objfile_obstack,
8703 hashtab_obstack_allocate,
8704 dummy_obstack_deallocate);
8707 /* Lookup DWO file DWO_NAME. */
8710 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8712 struct dwo_file find_entry;
8715 if (dwarf2_per_objfile->dwo_files == NULL)
8716 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8718 memset (&find_entry, 0, sizeof (find_entry));
8719 find_entry.dwo_name = dwo_name;
8720 find_entry.comp_dir = comp_dir;
8721 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8727 hash_dwo_unit (const void *item)
8729 const struct dwo_unit *dwo_unit = item;
8731 /* This drops the top 32 bits of the id, but is ok for a hash. */
8732 return dwo_unit->signature;
8736 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8738 const struct dwo_unit *lhs = item_lhs;
8739 const struct dwo_unit *rhs = item_rhs;
8741 /* The signature is assumed to be unique within the DWO file.
8742 So while object file CU dwo_id's always have the value zero,
8743 that's OK, assuming each object file DWO file has only one CU,
8744 and that's the rule for now. */
8745 return lhs->signature == rhs->signature;
8748 /* Allocate a hash table for DWO CUs,TUs.
8749 There is one of these tables for each of CUs,TUs for each DWO file. */
8752 allocate_dwo_unit_table (struct objfile *objfile)
8754 /* Start out with a pretty small number.
8755 Generally DWO files contain only one CU and maybe some TUs. */
8756 return htab_create_alloc_ex (3,
8760 &objfile->objfile_obstack,
8761 hashtab_obstack_allocate,
8762 dummy_obstack_deallocate);
8765 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8767 struct create_dwo_cu_data
8769 struct dwo_file *dwo_file;
8770 struct dwo_unit dwo_unit;
8773 /* die_reader_func for create_dwo_cu. */
8776 create_dwo_cu_reader (const struct die_reader_specs *reader,
8777 const gdb_byte *info_ptr,
8778 struct die_info *comp_unit_die,
8782 struct dwarf2_cu *cu = reader->cu;
8783 struct objfile *objfile = dwarf2_per_objfile->objfile;
8784 sect_offset offset = cu->per_cu->offset;
8785 struct dwarf2_section_info *section = cu->per_cu->section;
8786 struct create_dwo_cu_data *data = datap;
8787 struct dwo_file *dwo_file = data->dwo_file;
8788 struct dwo_unit *dwo_unit = &data->dwo_unit;
8789 struct attribute *attr;
8791 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8794 complaint (&symfile_complaints,
8795 _("Dwarf Error: debug entry at offset 0x%x is missing"
8796 " its dwo_id [in module %s]"),
8797 offset.sect_off, dwo_file->dwo_name);
8801 dwo_unit->dwo_file = dwo_file;
8802 dwo_unit->signature = DW_UNSND (attr);
8803 dwo_unit->section = section;
8804 dwo_unit->offset = offset;
8805 dwo_unit->length = cu->per_cu->length;
8807 if (dwarf2_read_debug)
8808 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8809 offset.sect_off, hex_string (dwo_unit->signature));
8812 /* Create the dwo_unit for the lone CU in DWO_FILE.
8813 Note: This function processes DWO files only, not DWP files. */
8815 static struct dwo_unit *
8816 create_dwo_cu (struct dwo_file *dwo_file)
8818 struct objfile *objfile = dwarf2_per_objfile->objfile;
8819 struct dwarf2_section_info *section = &dwo_file->sections.info;
8822 const gdb_byte *info_ptr, *end_ptr;
8823 struct create_dwo_cu_data create_dwo_cu_data;
8824 struct dwo_unit *dwo_unit;
8826 dwarf2_read_section (objfile, section);
8827 info_ptr = section->buffer;
8829 if (info_ptr == NULL)
8832 /* We can't set abfd until now because the section may be empty or
8833 not present, in which case section->asection will be NULL. */
8834 abfd = section->asection->owner;
8836 if (dwarf2_read_debug)
8838 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8839 bfd_section_name (abfd, section->asection),
8840 bfd_get_filename (abfd));
8843 create_dwo_cu_data.dwo_file = dwo_file;
8846 end_ptr = info_ptr + section->size;
8847 while (info_ptr < end_ptr)
8849 struct dwarf2_per_cu_data per_cu;
8851 memset (&create_dwo_cu_data.dwo_unit, 0,
8852 sizeof (create_dwo_cu_data.dwo_unit));
8853 memset (&per_cu, 0, sizeof (per_cu));
8854 per_cu.objfile = objfile;
8855 per_cu.is_debug_types = 0;
8856 per_cu.offset.sect_off = info_ptr - section->buffer;
8857 per_cu.section = section;
8859 init_cutu_and_read_dies_no_follow (&per_cu,
8860 &dwo_file->sections.abbrev,
8862 create_dwo_cu_reader,
8863 &create_dwo_cu_data);
8865 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8867 /* If we've already found one, complain. We only support one
8868 because having more than one requires hacking the dwo_name of
8869 each to match, which is highly unlikely to happen. */
8870 if (dwo_unit != NULL)
8872 complaint (&symfile_complaints,
8873 _("Multiple CUs in DWO file %s [in module %s]"),
8874 dwo_file->dwo_name, objfile->name);
8878 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8879 *dwo_unit = create_dwo_cu_data.dwo_unit;
8882 info_ptr += per_cu.length;
8888 /* DWP file .debug_{cu,tu}_index section format:
8889 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8893 Both index sections have the same format, and serve to map a 64-bit
8894 signature to a set of section numbers. Each section begins with a header,
8895 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8896 indexes, and a pool of 32-bit section numbers. The index sections will be
8897 aligned at 8-byte boundaries in the file.
8899 The index section header consists of:
8901 V, 32 bit version number
8903 N, 32 bit number of compilation units or type units in the index
8904 M, 32 bit number of slots in the hash table
8906 Numbers are recorded using the byte order of the application binary.
8908 We assume that N and M will not exceed 2^32 - 1.
8910 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8912 The hash table begins at offset 16 in the section, and consists of an array
8913 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8914 order of the application binary). Unused slots in the hash table are 0.
8915 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8917 The parallel table begins immediately after the hash table
8918 (at offset 16 + 8 * M from the beginning of the section), and consists of an
8919 array of 32-bit indexes (using the byte order of the application binary),
8920 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8921 table contains a 32-bit index into the pool of section numbers. For unused
8922 hash table slots, the corresponding entry in the parallel table will be 0.
8924 Given a 64-bit compilation unit signature or a type signature S, an entry
8925 in the hash table is located as follows:
8927 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8928 the low-order k bits all set to 1.
8930 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8932 3) If the hash table entry at index H matches the signature, use that
8933 entry. If the hash table entry at index H is unused (all zeroes),
8934 terminate the search: the signature is not present in the table.
8936 4) Let H = (H + H') modulo M. Repeat at Step 3.
8938 Because M > N and H' and M are relatively prime, the search is guaranteed
8939 to stop at an unused slot or find the match.
8941 The pool of section numbers begins immediately following the hash table
8942 (at offset 16 + 12 * M from the beginning of the section). The pool of
8943 section numbers consists of an array of 32-bit words (using the byte order
8944 of the application binary). Each item in the array is indexed starting
8945 from 0. The hash table entry provides the index of the first section
8946 number in the set. Additional section numbers in the set follow, and the
8947 set is terminated by a 0 entry (section number 0 is not used in ELF).
8949 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8950 section must be the first entry in the set, and the .debug_abbrev.dwo must
8951 be the second entry. Other members of the set may follow in any order. */
8953 /* Create a hash table to map DWO IDs to their CU/TU entry in
8954 .debug_{info,types}.dwo in DWP_FILE.
8955 Returns NULL if there isn't one.
8956 Note: This function processes DWP files only, not DWO files. */
8958 static struct dwp_hash_table *
8959 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8961 struct objfile *objfile = dwarf2_per_objfile->objfile;
8962 bfd *dbfd = dwp_file->dbfd;
8963 const gdb_byte *index_ptr, *index_end;
8964 struct dwarf2_section_info *index;
8965 uint32_t version, nr_units, nr_slots;
8966 struct dwp_hash_table *htab;
8969 index = &dwp_file->sections.tu_index;
8971 index = &dwp_file->sections.cu_index;
8973 if (dwarf2_section_empty_p (index))
8975 dwarf2_read_section (objfile, index);
8977 index_ptr = index->buffer;
8978 index_end = index_ptr + index->size;
8980 version = read_4_bytes (dbfd, index_ptr);
8981 index_ptr += 8; /* Skip the unused word. */
8982 nr_units = read_4_bytes (dbfd, index_ptr);
8984 nr_slots = read_4_bytes (dbfd, index_ptr);
8989 error (_("Dwarf Error: unsupported DWP file version (%s)"
8991 pulongest (version), dwp_file->name);
8993 if (nr_slots != (nr_slots & -nr_slots))
8995 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
8996 " is not power of 2 [in module %s]"),
8997 pulongest (nr_slots), dwp_file->name);
9000 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9001 htab->nr_units = nr_units;
9002 htab->nr_slots = nr_slots;
9003 htab->hash_table = index_ptr;
9004 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9005 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
9010 /* Update SECTIONS with the data from SECTP.
9012 This function is like the other "locate" section routines that are
9013 passed to bfd_map_over_sections, but in this context the sections to
9014 read comes from the DWP hash table, not the full ELF section table.
9016 The result is non-zero for success, or zero if an error was found. */
9019 locate_virtual_dwo_sections (asection *sectp,
9020 struct virtual_dwo_sections *sections)
9022 const struct dwop_section_names *names = &dwop_section_names;
9024 if (section_is_p (sectp->name, &names->abbrev_dwo))
9026 /* There can be only one. */
9027 if (sections->abbrev.asection != NULL)
9029 sections->abbrev.asection = sectp;
9030 sections->abbrev.size = bfd_get_section_size (sectp);
9032 else if (section_is_p (sectp->name, &names->info_dwo)
9033 || section_is_p (sectp->name, &names->types_dwo))
9035 /* There can be only one. */
9036 if (sections->info_or_types.asection != NULL)
9038 sections->info_or_types.asection = sectp;
9039 sections->info_or_types.size = bfd_get_section_size (sectp);
9041 else if (section_is_p (sectp->name, &names->line_dwo))
9043 /* There can be only one. */
9044 if (sections->line.asection != NULL)
9046 sections->line.asection = sectp;
9047 sections->line.size = bfd_get_section_size (sectp);
9049 else if (section_is_p (sectp->name, &names->loc_dwo))
9051 /* There can be only one. */
9052 if (sections->loc.asection != NULL)
9054 sections->loc.asection = sectp;
9055 sections->loc.size = bfd_get_section_size (sectp);
9057 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9059 /* There can be only one. */
9060 if (sections->macinfo.asection != NULL)
9062 sections->macinfo.asection = sectp;
9063 sections->macinfo.size = bfd_get_section_size (sectp);
9065 else if (section_is_p (sectp->name, &names->macro_dwo))
9067 /* There can be only one. */
9068 if (sections->macro.asection != NULL)
9070 sections->macro.asection = sectp;
9071 sections->macro.size = bfd_get_section_size (sectp);
9073 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9075 /* There can be only one. */
9076 if (sections->str_offsets.asection != NULL)
9078 sections->str_offsets.asection = sectp;
9079 sections->str_offsets.size = bfd_get_section_size (sectp);
9083 /* No other kind of section is valid. */
9090 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
9091 HTAB is the hash table from the DWP file.
9092 SECTION_INDEX is the index of the DWO in HTAB.
9093 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
9095 static struct dwo_unit *
9096 create_dwo_in_dwp (struct dwp_file *dwp_file,
9097 const struct dwp_hash_table *htab,
9098 uint32_t section_index,
9099 const char *comp_dir,
9100 ULONGEST signature, int is_debug_types)
9102 struct objfile *objfile = dwarf2_per_objfile->objfile;
9103 bfd *dbfd = dwp_file->dbfd;
9104 const char *kind = is_debug_types ? "TU" : "CU";
9105 struct dwo_file *dwo_file;
9106 struct dwo_unit *dwo_unit;
9107 struct virtual_dwo_sections sections;
9108 void **dwo_file_slot;
9109 char *virtual_dwo_name;
9110 struct dwarf2_section_info *cutu;
9111 struct cleanup *cleanups;
9114 if (dwarf2_read_debug)
9116 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP file: %s\n",
9118 pulongest (section_index), hex_string (signature),
9122 /* Fetch the sections of this DWO.
9123 Put a limit on the number of sections we look for so that bad data
9124 doesn't cause us to loop forever. */
9126 #define MAX_NR_DWO_SECTIONS \
9127 (1 /* .debug_info or .debug_types */ \
9128 + 1 /* .debug_abbrev */ \
9129 + 1 /* .debug_line */ \
9130 + 1 /* .debug_loc */ \
9131 + 1 /* .debug_str_offsets */ \
9132 + 1 /* .debug_macro */ \
9133 + 1 /* .debug_macinfo */ \
9134 + 1 /* trailing zero */)
9136 memset (§ions, 0, sizeof (sections));
9137 cleanups = make_cleanup (null_cleanup, 0);
9139 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
9142 uint32_t section_nr =
9145 + (section_index + i) * sizeof (uint32_t));
9147 if (section_nr == 0)
9149 if (section_nr >= dwp_file->num_sections)
9151 error (_("Dwarf Error: bad DWP hash table, section number too large"
9156 sectp = dwp_file->elf_sections[section_nr];
9157 if (! locate_virtual_dwo_sections (sectp, §ions))
9159 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9166 || sections.info_or_types.asection == NULL
9167 || sections.abbrev.asection == NULL)
9169 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9173 if (i == MAX_NR_DWO_SECTIONS)
9175 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9180 /* It's easier for the rest of the code if we fake a struct dwo_file and
9181 have dwo_unit "live" in that. At least for now.
9183 The DWP file can be made up of a random collection of CUs and TUs.
9184 However, for each CU + set of TUs that came from the same original DWO
9185 file, we want to combine them back into a virtual DWO file to save space
9186 (fewer struct dwo_file objects to allocated). Remember that for really
9187 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9190 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9191 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
9192 sections.line.asection ? sections.line.asection->id : 0,
9193 sections.loc.asection ? sections.loc.asection->id : 0,
9194 (sections.str_offsets.asection
9195 ? sections.str_offsets.asection->id
9197 make_cleanup (xfree, virtual_dwo_name);
9198 /* Can we use an existing virtual DWO file? */
9199 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9200 /* Create one if necessary. */
9201 if (*dwo_file_slot == NULL)
9203 if (dwarf2_read_debug)
9205 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9208 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9209 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9211 strlen (virtual_dwo_name));
9212 dwo_file->comp_dir = comp_dir;
9213 dwo_file->sections.abbrev = sections.abbrev;
9214 dwo_file->sections.line = sections.line;
9215 dwo_file->sections.loc = sections.loc;
9216 dwo_file->sections.macinfo = sections.macinfo;
9217 dwo_file->sections.macro = sections.macro;
9218 dwo_file->sections.str_offsets = sections.str_offsets;
9219 /* The "str" section is global to the entire DWP file. */
9220 dwo_file->sections.str = dwp_file->sections.str;
9221 /* The info or types section is assigned later to dwo_unit,
9222 there's no need to record it in dwo_file.
9223 Also, we can't simply record type sections in dwo_file because
9224 we record a pointer into the vector in dwo_unit. As we collect more
9225 types we'll grow the vector and eventually have to reallocate space
9226 for it, invalidating all the pointers into the current copy. */
9227 *dwo_file_slot = dwo_file;
9231 if (dwarf2_read_debug)
9233 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9236 dwo_file = *dwo_file_slot;
9238 do_cleanups (cleanups);
9240 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9241 dwo_unit->dwo_file = dwo_file;
9242 dwo_unit->signature = signature;
9243 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9244 sizeof (struct dwarf2_section_info));
9245 *dwo_unit->section = sections.info_or_types;
9246 /* offset, length, type_offset_in_tu are set later. */
9251 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
9253 static struct dwo_unit *
9254 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
9255 const struct dwp_hash_table *htab,
9256 const char *comp_dir,
9257 ULONGEST signature, int is_debug_types)
9259 bfd *dbfd = dwp_file->dbfd;
9260 uint32_t mask = htab->nr_slots - 1;
9261 uint32_t hash = signature & mask;
9262 uint32_t hash2 = ((signature >> 32) & mask) | 1;
9265 struct dwo_unit find_dwo_cu, *dwo_cu;
9267 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
9268 find_dwo_cu.signature = signature;
9269 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
9274 /* Use a for loop so that we don't loop forever on bad debug info. */
9275 for (i = 0; i < htab->nr_slots; ++i)
9277 ULONGEST signature_in_table;
9279 signature_in_table =
9280 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
9281 if (signature_in_table == signature)
9283 uint32_t section_index =
9284 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
9286 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
9287 comp_dir, signature, is_debug_types);
9290 if (signature_in_table == 0)
9292 hash = (hash + hash2) & mask;
9295 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
9300 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
9301 Open the file specified by FILE_NAME and hand it off to BFD for
9302 preliminary analysis. Return a newly initialized bfd *, which
9303 includes a canonicalized copy of FILE_NAME.
9304 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
9305 SEARCH_CWD is true if the current directory is to be searched.
9306 It will be searched before debug-file-directory.
9307 If unable to find/open the file, return NULL.
9308 NOTE: This function is derived from symfile_bfd_open. */
9311 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
9315 char *absolute_name;
9316 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
9317 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
9318 to debug_file_directory. */
9320 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
9324 if (*debug_file_directory != '\0')
9325 search_path = concat (".", dirname_separator_string,
9326 debug_file_directory, NULL);
9328 search_path = xstrdup (".");
9331 search_path = xstrdup (debug_file_directory);
9335 flags |= OPF_SEARCH_IN_PATH;
9336 desc = openp (search_path, flags, file_name,
9337 O_RDONLY | O_BINARY, &absolute_name);
9338 xfree (search_path);
9342 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
9343 xfree (absolute_name);
9344 if (sym_bfd == NULL)
9346 bfd_set_cacheable (sym_bfd, 1);
9348 if (!bfd_check_format (sym_bfd, bfd_object))
9350 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
9357 /* Try to open DWO file FILE_NAME.
9358 COMP_DIR is the DW_AT_comp_dir attribute.
9359 The result is the bfd handle of the file.
9360 If there is a problem finding or opening the file, return NULL.
9361 Upon success, the canonicalized path of the file is stored in the bfd,
9362 same as symfile_bfd_open. */
9365 open_dwo_file (const char *file_name, const char *comp_dir)
9369 if (IS_ABSOLUTE_PATH (file_name))
9370 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
9372 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
9374 if (comp_dir != NULL)
9376 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
9378 /* NOTE: If comp_dir is a relative path, this will also try the
9379 search path, which seems useful. */
9380 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
9381 xfree (path_to_try);
9386 /* That didn't work, try debug-file-directory, which, despite its name,
9387 is a list of paths. */
9389 if (*debug_file_directory == '\0')
9392 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
9395 /* This function is mapped across the sections and remembers the offset and
9396 size of each of the DWO debugging sections we are interested in. */
9399 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9401 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9402 const struct dwop_section_names *names = &dwop_section_names;
9404 if (section_is_p (sectp->name, &names->abbrev_dwo))
9406 dwo_sections->abbrev.asection = sectp;
9407 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9409 else if (section_is_p (sectp->name, &names->info_dwo))
9411 dwo_sections->info.asection = sectp;
9412 dwo_sections->info.size = bfd_get_section_size (sectp);
9414 else if (section_is_p (sectp->name, &names->line_dwo))
9416 dwo_sections->line.asection = sectp;
9417 dwo_sections->line.size = bfd_get_section_size (sectp);
9419 else if (section_is_p (sectp->name, &names->loc_dwo))
9421 dwo_sections->loc.asection = sectp;
9422 dwo_sections->loc.size = bfd_get_section_size (sectp);
9424 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9426 dwo_sections->macinfo.asection = sectp;
9427 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9429 else if (section_is_p (sectp->name, &names->macro_dwo))
9431 dwo_sections->macro.asection = sectp;
9432 dwo_sections->macro.size = bfd_get_section_size (sectp);
9434 else if (section_is_p (sectp->name, &names->str_dwo))
9436 dwo_sections->str.asection = sectp;
9437 dwo_sections->str.size = bfd_get_section_size (sectp);
9439 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9441 dwo_sections->str_offsets.asection = sectp;
9442 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9444 else if (section_is_p (sectp->name, &names->types_dwo))
9446 struct dwarf2_section_info type_section;
9448 memset (&type_section, 0, sizeof (type_section));
9449 type_section.asection = sectp;
9450 type_section.size = bfd_get_section_size (sectp);
9451 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9456 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9457 by PER_CU. This is for the non-DWP case.
9458 The result is NULL if DWO_NAME can't be found. */
9460 static struct dwo_file *
9461 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9462 const char *dwo_name, const char *comp_dir)
9464 struct objfile *objfile = dwarf2_per_objfile->objfile;
9465 struct dwo_file *dwo_file;
9467 struct cleanup *cleanups;
9469 dbfd = open_dwo_file (dwo_name, comp_dir);
9472 if (dwarf2_read_debug)
9473 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9476 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9477 dwo_file->dwo_name = dwo_name;
9478 dwo_file->comp_dir = comp_dir;
9479 dwo_file->dbfd = dbfd;
9481 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9483 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9485 dwo_file->cu = create_dwo_cu (dwo_file);
9487 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9488 dwo_file->sections.types);
9490 discard_cleanups (cleanups);
9492 if (dwarf2_read_debug)
9493 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9498 /* This function is mapped across the sections and remembers the offset and
9499 size of each of the DWP debugging sections we are interested in. */
9502 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9504 struct dwp_file *dwp_file = dwp_file_ptr;
9505 const struct dwop_section_names *names = &dwop_section_names;
9506 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9508 /* Record the ELF section number for later lookup: this is what the
9509 .debug_cu_index,.debug_tu_index tables use. */
9510 gdb_assert (elf_section_nr < dwp_file->num_sections);
9511 dwp_file->elf_sections[elf_section_nr] = sectp;
9513 /* Look for specific sections that we need. */
9514 if (section_is_p (sectp->name, &names->str_dwo))
9516 dwp_file->sections.str.asection = sectp;
9517 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9519 else if (section_is_p (sectp->name, &names->cu_index))
9521 dwp_file->sections.cu_index.asection = sectp;
9522 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9524 else if (section_is_p (sectp->name, &names->tu_index))
9526 dwp_file->sections.tu_index.asection = sectp;
9527 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9531 /* Hash function for dwp_file loaded CUs/TUs. */
9534 hash_dwp_loaded_cutus (const void *item)
9536 const struct dwo_unit *dwo_unit = item;
9538 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9539 return dwo_unit->signature;
9542 /* Equality function for dwp_file loaded CUs/TUs. */
9545 eq_dwp_loaded_cutus (const void *a, const void *b)
9547 const struct dwo_unit *dua = a;
9548 const struct dwo_unit *dub = b;
9550 return dua->signature == dub->signature;
9553 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9556 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9558 return htab_create_alloc_ex (3,
9559 hash_dwp_loaded_cutus,
9560 eq_dwp_loaded_cutus,
9562 &objfile->objfile_obstack,
9563 hashtab_obstack_allocate,
9564 dummy_obstack_deallocate);
9567 /* Try to open DWP file FILE_NAME.
9568 The result is the bfd handle of the file.
9569 If there is a problem finding or opening the file, return NULL.
9570 Upon success, the canonicalized path of the file is stored in the bfd,
9571 same as symfile_bfd_open. */
9574 open_dwp_file (const char *file_name)
9578 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
9582 /* Work around upstream bug 15652.
9583 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
9584 [Whether that's a "bug" is debatable, but it is getting in our way.]
9585 We have no real idea where the dwp file is, because gdb's realpath-ing
9586 of the executable's path may have discarded the needed info.
9587 [IWBN if the dwp file name was recorded in the executable, akin to
9588 .gnu_debuglink, but that doesn't exist yet.]
9589 Strip the directory from FILE_NAME and search again. */
9590 if (*debug_file_directory != '\0')
9592 /* Don't implicitly search the current directory here.
9593 If the user wants to search "." to handle this case,
9594 it must be added to debug-file-directory. */
9595 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
9602 /* Initialize the use of the DWP file for the current objfile.
9603 By convention the name of the DWP file is ${objfile}.dwp.
9604 The result is NULL if it can't be found. */
9606 static struct dwp_file *
9607 open_and_init_dwp_file (void)
9609 struct objfile *objfile = dwarf2_per_objfile->objfile;
9610 struct dwp_file *dwp_file;
9613 struct cleanup *cleanups;
9615 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9616 cleanups = make_cleanup (xfree, dwp_name);
9618 dbfd = open_dwp_file (dwp_name);
9621 if (dwarf2_read_debug)
9622 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9623 do_cleanups (cleanups);
9626 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9627 dwp_file->name = bfd_get_filename (dbfd);
9628 dwp_file->dbfd = dbfd;
9629 do_cleanups (cleanups);
9631 /* +1: section 0 is unused */
9632 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9633 dwp_file->elf_sections =
9634 OBSTACK_CALLOC (&objfile->objfile_obstack,
9635 dwp_file->num_sections, asection *);
9637 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9639 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9641 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9643 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9645 if (dwarf2_read_debug)
9647 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9648 fprintf_unfiltered (gdb_stdlog,
9649 " %s CUs, %s TUs\n",
9650 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
9651 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
9657 /* Wrapper around open_and_init_dwp_file, only open it once. */
9659 static struct dwp_file *
9662 if (! dwarf2_per_objfile->dwp_checked)
9664 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9665 dwarf2_per_objfile->dwp_checked = 1;
9667 return dwarf2_per_objfile->dwp_file;
9670 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9671 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9672 or in the DWP file for the objfile, referenced by THIS_UNIT.
9673 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9674 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9676 This is called, for example, when wanting to read a variable with a
9677 complex location. Therefore we don't want to do file i/o for every call.
9678 Therefore we don't want to look for a DWO file on every call.
9679 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9680 then we check if we've already seen DWO_NAME, and only THEN do we check
9683 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9684 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9686 static struct dwo_unit *
9687 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9688 const char *dwo_name, const char *comp_dir,
9689 ULONGEST signature, int is_debug_types)
9691 struct objfile *objfile = dwarf2_per_objfile->objfile;
9692 const char *kind = is_debug_types ? "TU" : "CU";
9693 void **dwo_file_slot;
9694 struct dwo_file *dwo_file;
9695 struct dwp_file *dwp_file;
9697 /* First see if there's a DWP file.
9698 If we have a DWP file but didn't find the DWO inside it, don't
9699 look for the original DWO file. It makes gdb behave differently
9700 depending on whether one is debugging in the build tree. */
9702 dwp_file = get_dwp_file ();
9703 if (dwp_file != NULL)
9705 const struct dwp_hash_table *dwp_htab =
9706 is_debug_types ? dwp_file->tus : dwp_file->cus;
9708 if (dwp_htab != NULL)
9710 struct dwo_unit *dwo_cutu =
9711 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9712 signature, is_debug_types);
9714 if (dwo_cutu != NULL)
9716 if (dwarf2_read_debug)
9718 fprintf_unfiltered (gdb_stdlog,
9719 "Virtual DWO %s %s found: @%s\n",
9720 kind, hex_string (signature),
9721 host_address_to_string (dwo_cutu));
9729 /* No DWP file, look for the DWO file. */
9731 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9732 if (*dwo_file_slot == NULL)
9734 /* Read in the file and build a table of the CUs/TUs it contains. */
9735 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9737 /* NOTE: This will be NULL if unable to open the file. */
9738 dwo_file = *dwo_file_slot;
9740 if (dwo_file != NULL)
9742 struct dwo_unit *dwo_cutu = NULL;
9744 if (is_debug_types && dwo_file->tus)
9746 struct dwo_unit find_dwo_cutu;
9748 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9749 find_dwo_cutu.signature = signature;
9750 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9752 else if (!is_debug_types && dwo_file->cu)
9754 if (signature == dwo_file->cu->signature)
9755 dwo_cutu = dwo_file->cu;
9758 if (dwo_cutu != NULL)
9760 if (dwarf2_read_debug)
9762 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9763 kind, dwo_name, hex_string (signature),
9764 host_address_to_string (dwo_cutu));
9771 /* We didn't find it. This could mean a dwo_id mismatch, or
9772 someone deleted the DWO/DWP file, or the search path isn't set up
9773 correctly to find the file. */
9775 if (dwarf2_read_debug)
9777 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9778 kind, dwo_name, hex_string (signature));
9781 complaint (&symfile_complaints,
9782 _("Could not find DWO %s %s(%s) referenced by %s at offset 0x%x"
9784 kind, dwo_name, hex_string (signature),
9785 this_unit->is_debug_types ? "TU" : "CU",
9786 this_unit->offset.sect_off, objfile->name);
9790 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9791 See lookup_dwo_cutu_unit for details. */
9793 static struct dwo_unit *
9794 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9795 const char *dwo_name, const char *comp_dir,
9798 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9801 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9802 See lookup_dwo_cutu_unit for details. */
9804 static struct dwo_unit *
9805 lookup_dwo_type_unit (struct signatured_type *this_tu,
9806 const char *dwo_name, const char *comp_dir)
9808 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9811 /* Free all resources associated with DWO_FILE.
9812 Close the DWO file and munmap the sections.
9813 All memory should be on the objfile obstack. */
9816 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9819 struct dwarf2_section_info *section;
9821 /* Note: dbfd is NULL for virtual DWO files. */
9822 gdb_bfd_unref (dwo_file->dbfd);
9824 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9827 /* Wrapper for free_dwo_file for use in cleanups. */
9830 free_dwo_file_cleanup (void *arg)
9832 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9833 struct objfile *objfile = dwarf2_per_objfile->objfile;
9835 free_dwo_file (dwo_file, objfile);
9838 /* Traversal function for free_dwo_files. */
9841 free_dwo_file_from_slot (void **slot, void *info)
9843 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9844 struct objfile *objfile = (struct objfile *) info;
9846 free_dwo_file (dwo_file, objfile);
9851 /* Free all resources associated with DWO_FILES. */
9854 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9856 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9859 /* Read in various DIEs. */
9861 /* qsort helper for inherit_abstract_dies. */
9864 unsigned_int_compar (const void *ap, const void *bp)
9866 unsigned int a = *(unsigned int *) ap;
9867 unsigned int b = *(unsigned int *) bp;
9869 return (a > b) - (b > a);
9872 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9873 Inherit only the children of the DW_AT_abstract_origin DIE not being
9874 already referenced by DW_AT_abstract_origin from the children of the
9878 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9880 struct die_info *child_die;
9881 unsigned die_children_count;
9882 /* CU offsets which were referenced by children of the current DIE. */
9883 sect_offset *offsets;
9884 sect_offset *offsets_end, *offsetp;
9885 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9886 struct die_info *origin_die;
9887 /* Iterator of the ORIGIN_DIE children. */
9888 struct die_info *origin_child_die;
9889 struct cleanup *cleanups;
9890 struct attribute *attr;
9891 struct dwarf2_cu *origin_cu;
9892 struct pending **origin_previous_list_in_scope;
9894 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9898 /* Note that following die references may follow to a die in a
9902 origin_die = follow_die_ref (die, attr, &origin_cu);
9904 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9906 origin_previous_list_in_scope = origin_cu->list_in_scope;
9907 origin_cu->list_in_scope = cu->list_in_scope;
9909 if (die->tag != origin_die->tag
9910 && !(die->tag == DW_TAG_inlined_subroutine
9911 && origin_die->tag == DW_TAG_subprogram))
9912 complaint (&symfile_complaints,
9913 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9914 die->offset.sect_off, origin_die->offset.sect_off);
9916 child_die = die->child;
9917 die_children_count = 0;
9918 while (child_die && child_die->tag)
9920 child_die = sibling_die (child_die);
9921 die_children_count++;
9923 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9924 cleanups = make_cleanup (xfree, offsets);
9926 offsets_end = offsets;
9927 child_die = die->child;
9928 while (child_die && child_die->tag)
9930 /* For each CHILD_DIE, find the corresponding child of
9931 ORIGIN_DIE. If there is more than one layer of
9932 DW_AT_abstract_origin, follow them all; there shouldn't be,
9933 but GCC versions at least through 4.4 generate this (GCC PR
9935 struct die_info *child_origin_die = child_die;
9936 struct dwarf2_cu *child_origin_cu = cu;
9940 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9944 child_origin_die = follow_die_ref (child_origin_die, attr,
9948 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9949 counterpart may exist. */
9950 if (child_origin_die != child_die)
9952 if (child_die->tag != child_origin_die->tag
9953 && !(child_die->tag == DW_TAG_inlined_subroutine
9954 && child_origin_die->tag == DW_TAG_subprogram))
9955 complaint (&symfile_complaints,
9956 _("Child DIE 0x%x and its abstract origin 0x%x have "
9957 "different tags"), child_die->offset.sect_off,
9958 child_origin_die->offset.sect_off);
9959 if (child_origin_die->parent != origin_die)
9960 complaint (&symfile_complaints,
9961 _("Child DIE 0x%x and its abstract origin 0x%x have "
9962 "different parents"), child_die->offset.sect_off,
9963 child_origin_die->offset.sect_off);
9965 *offsets_end++ = child_origin_die->offset;
9967 child_die = sibling_die (child_die);
9969 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9970 unsigned_int_compar);
9971 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9972 if (offsetp[-1].sect_off == offsetp->sect_off)
9973 complaint (&symfile_complaints,
9974 _("Multiple children of DIE 0x%x refer "
9975 "to DIE 0x%x as their abstract origin"),
9976 die->offset.sect_off, offsetp->sect_off);
9979 origin_child_die = origin_die->child;
9980 while (origin_child_die && origin_child_die->tag)
9982 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9983 while (offsetp < offsets_end
9984 && offsetp->sect_off < origin_child_die->offset.sect_off)
9986 if (offsetp >= offsets_end
9987 || offsetp->sect_off > origin_child_die->offset.sect_off)
9989 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9990 process_die (origin_child_die, origin_cu);
9992 origin_child_die = sibling_die (origin_child_die);
9994 origin_cu->list_in_scope = origin_previous_list_in_scope;
9996 do_cleanups (cleanups);
10000 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
10002 struct objfile *objfile = cu->objfile;
10003 struct context_stack *new;
10006 struct die_info *child_die;
10007 struct attribute *attr, *call_line, *call_file;
10009 CORE_ADDR baseaddr;
10010 struct block *block;
10011 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
10012 VEC (symbolp) *template_args = NULL;
10013 struct template_symbol *templ_func = NULL;
10017 /* If we do not have call site information, we can't show the
10018 caller of this inlined function. That's too confusing, so
10019 only use the scope for local variables. */
10020 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
10021 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
10022 if (call_line == NULL || call_file == NULL)
10024 read_lexical_block_scope (die, cu);
10029 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10031 name = dwarf2_name (die, cu);
10033 /* Ignore functions with missing or empty names. These are actually
10034 illegal according to the DWARF standard. */
10037 complaint (&symfile_complaints,
10038 _("missing name for subprogram DIE at %d"),
10039 die->offset.sect_off);
10043 /* Ignore functions with missing or invalid low and high pc attributes. */
10044 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10046 attr = dwarf2_attr (die, DW_AT_external, cu);
10047 if (!attr || !DW_UNSND (attr))
10048 complaint (&symfile_complaints,
10049 _("cannot get low and high bounds "
10050 "for subprogram DIE at %d"),
10051 die->offset.sect_off);
10056 highpc += baseaddr;
10058 /* If we have any template arguments, then we must allocate a
10059 different sort of symbol. */
10060 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
10062 if (child_die->tag == DW_TAG_template_type_param
10063 || child_die->tag == DW_TAG_template_value_param)
10065 templ_func = allocate_template_symbol (objfile);
10066 templ_func->base.is_cplus_template_function = 1;
10071 new = push_context (0, lowpc);
10072 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
10073 (struct symbol *) templ_func);
10075 /* If there is a location expression for DW_AT_frame_base, record
10077 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
10079 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
10081 cu->list_in_scope = &local_symbols;
10083 if (die->child != NULL)
10085 child_die = die->child;
10086 while (child_die && child_die->tag)
10088 if (child_die->tag == DW_TAG_template_type_param
10089 || child_die->tag == DW_TAG_template_value_param)
10091 struct symbol *arg = new_symbol (child_die, NULL, cu);
10094 VEC_safe_push (symbolp, template_args, arg);
10097 process_die (child_die, cu);
10098 child_die = sibling_die (child_die);
10102 inherit_abstract_dies (die, cu);
10104 /* If we have a DW_AT_specification, we might need to import using
10105 directives from the context of the specification DIE. See the
10106 comment in determine_prefix. */
10107 if (cu->language == language_cplus
10108 && dwarf2_attr (die, DW_AT_specification, cu))
10110 struct dwarf2_cu *spec_cu = cu;
10111 struct die_info *spec_die = die_specification (die, &spec_cu);
10115 child_die = spec_die->child;
10116 while (child_die && child_die->tag)
10118 if (child_die->tag == DW_TAG_imported_module)
10119 process_die (child_die, spec_cu);
10120 child_die = sibling_die (child_die);
10123 /* In some cases, GCC generates specification DIEs that
10124 themselves contain DW_AT_specification attributes. */
10125 spec_die = die_specification (spec_die, &spec_cu);
10129 new = pop_context ();
10130 /* Make a block for the local symbols within. */
10131 block = finish_block (new->name, &local_symbols, new->old_blocks,
10132 lowpc, highpc, objfile);
10134 /* For C++, set the block's scope. */
10135 if ((cu->language == language_cplus || cu->language == language_fortran)
10136 && cu->processing_has_namespace_info)
10137 block_set_scope (block, determine_prefix (die, cu),
10138 &objfile->objfile_obstack);
10140 /* If we have address ranges, record them. */
10141 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10143 /* Attach template arguments to function. */
10144 if (! VEC_empty (symbolp, template_args))
10146 gdb_assert (templ_func != NULL);
10148 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
10149 templ_func->template_arguments
10150 = obstack_alloc (&objfile->objfile_obstack,
10151 (templ_func->n_template_arguments
10152 * sizeof (struct symbol *)));
10153 memcpy (templ_func->template_arguments,
10154 VEC_address (symbolp, template_args),
10155 (templ_func->n_template_arguments * sizeof (struct symbol *)));
10156 VEC_free (symbolp, template_args);
10159 /* In C++, we can have functions nested inside functions (e.g., when
10160 a function declares a class that has methods). This means that
10161 when we finish processing a function scope, we may need to go
10162 back to building a containing block's symbol lists. */
10163 local_symbols = new->locals;
10164 using_directives = new->using_directives;
10166 /* If we've finished processing a top-level function, subsequent
10167 symbols go in the file symbol list. */
10168 if (outermost_context_p ())
10169 cu->list_in_scope = &file_symbols;
10172 /* Process all the DIES contained within a lexical block scope. Start
10173 a new scope, process the dies, and then close the scope. */
10176 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
10178 struct objfile *objfile = cu->objfile;
10179 struct context_stack *new;
10180 CORE_ADDR lowpc, highpc;
10181 struct die_info *child_die;
10182 CORE_ADDR baseaddr;
10184 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10186 /* Ignore blocks with missing or invalid low and high pc attributes. */
10187 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
10188 as multiple lexical blocks? Handling children in a sane way would
10189 be nasty. Might be easier to properly extend generic blocks to
10190 describe ranges. */
10191 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10194 highpc += baseaddr;
10196 push_context (0, lowpc);
10197 if (die->child != NULL)
10199 child_die = die->child;
10200 while (child_die && child_die->tag)
10202 process_die (child_die, cu);
10203 child_die = sibling_die (child_die);
10206 new = pop_context ();
10208 if (local_symbols != NULL || using_directives != NULL)
10210 struct block *block
10211 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
10214 /* Note that recording ranges after traversing children, as we
10215 do here, means that recording a parent's ranges entails
10216 walking across all its children's ranges as they appear in
10217 the address map, which is quadratic behavior.
10219 It would be nicer to record the parent's ranges before
10220 traversing its children, simply overriding whatever you find
10221 there. But since we don't even decide whether to create a
10222 block until after we've traversed its children, that's hard
10224 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10226 local_symbols = new->locals;
10227 using_directives = new->using_directives;
10230 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
10233 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
10235 struct objfile *objfile = cu->objfile;
10236 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10237 CORE_ADDR pc, baseaddr;
10238 struct attribute *attr;
10239 struct call_site *call_site, call_site_local;
10242 struct die_info *child_die;
10244 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10246 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10249 complaint (&symfile_complaints,
10250 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
10251 "DIE 0x%x [in module %s]"),
10252 die->offset.sect_off, objfile->name);
10255 pc = DW_ADDR (attr) + baseaddr;
10257 if (cu->call_site_htab == NULL)
10258 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
10259 NULL, &objfile->objfile_obstack,
10260 hashtab_obstack_allocate, NULL);
10261 call_site_local.pc = pc;
10262 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
10265 complaint (&symfile_complaints,
10266 _("Duplicate PC %s for DW_TAG_GNU_call_site "
10267 "DIE 0x%x [in module %s]"),
10268 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
10272 /* Count parameters at the caller. */
10275 for (child_die = die->child; child_die && child_die->tag;
10276 child_die = sibling_die (child_die))
10278 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10280 complaint (&symfile_complaints,
10281 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
10282 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10283 child_die->tag, child_die->offset.sect_off, objfile->name);
10290 call_site = obstack_alloc (&objfile->objfile_obstack,
10291 (sizeof (*call_site)
10292 + (sizeof (*call_site->parameter)
10293 * (nparams - 1))));
10295 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
10296 call_site->pc = pc;
10298 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
10300 struct die_info *func_die;
10302 /* Skip also over DW_TAG_inlined_subroutine. */
10303 for (func_die = die->parent;
10304 func_die && func_die->tag != DW_TAG_subprogram
10305 && func_die->tag != DW_TAG_subroutine_type;
10306 func_die = func_die->parent);
10308 /* DW_AT_GNU_all_call_sites is a superset
10309 of DW_AT_GNU_all_tail_call_sites. */
10311 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
10312 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
10314 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
10315 not complete. But keep CALL_SITE for look ups via call_site_htab,
10316 both the initial caller containing the real return address PC and
10317 the final callee containing the current PC of a chain of tail
10318 calls do not need to have the tail call list complete. But any
10319 function candidate for a virtual tail call frame searched via
10320 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
10321 determined unambiguously. */
10325 struct type *func_type = NULL;
10328 func_type = get_die_type (func_die, cu);
10329 if (func_type != NULL)
10331 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
10333 /* Enlist this call site to the function. */
10334 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
10335 TYPE_TAIL_CALL_LIST (func_type) = call_site;
10338 complaint (&symfile_complaints,
10339 _("Cannot find function owning DW_TAG_GNU_call_site "
10340 "DIE 0x%x [in module %s]"),
10341 die->offset.sect_off, objfile->name);
10345 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
10347 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10348 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
10349 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
10350 /* Keep NULL DWARF_BLOCK. */;
10351 else if (attr_form_is_block (attr))
10353 struct dwarf2_locexpr_baton *dlbaton;
10355 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
10356 dlbaton->data = DW_BLOCK (attr)->data;
10357 dlbaton->size = DW_BLOCK (attr)->size;
10358 dlbaton->per_cu = cu->per_cu;
10360 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
10362 else if (is_ref_attr (attr))
10364 struct dwarf2_cu *target_cu = cu;
10365 struct die_info *target_die;
10367 target_die = follow_die_ref (die, attr, &target_cu);
10368 gdb_assert (target_cu->objfile == objfile);
10369 if (die_is_declaration (target_die, target_cu))
10371 const char *target_physname = NULL;
10372 struct attribute *target_attr;
10374 /* Prefer the mangled name; otherwise compute the demangled one. */
10375 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
10376 if (target_attr == NULL)
10377 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
10379 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
10380 target_physname = DW_STRING (target_attr);
10382 target_physname = dwarf2_physname (NULL, target_die, target_cu);
10383 if (target_physname == NULL)
10384 complaint (&symfile_complaints,
10385 _("DW_AT_GNU_call_site_target target DIE has invalid "
10386 "physname, for referencing DIE 0x%x [in module %s]"),
10387 die->offset.sect_off, objfile->name);
10389 SET_FIELD_PHYSNAME (call_site->target, target_physname);
10395 /* DW_AT_entry_pc should be preferred. */
10396 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
10397 complaint (&symfile_complaints,
10398 _("DW_AT_GNU_call_site_target target DIE has invalid "
10399 "low pc, for referencing DIE 0x%x [in module %s]"),
10400 die->offset.sect_off, objfile->name);
10402 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
10406 complaint (&symfile_complaints,
10407 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
10408 "block nor reference, for DIE 0x%x [in module %s]"),
10409 die->offset.sect_off, objfile->name);
10411 call_site->per_cu = cu->per_cu;
10413 for (child_die = die->child;
10414 child_die && child_die->tag;
10415 child_die = sibling_die (child_die))
10417 struct call_site_parameter *parameter;
10418 struct attribute *loc, *origin;
10420 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10422 /* Already printed the complaint above. */
10426 gdb_assert (call_site->parameter_count < nparams);
10427 parameter = &call_site->parameter[call_site->parameter_count];
10429 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10430 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10431 register is contained in DW_AT_GNU_call_site_value. */
10433 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10434 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10435 if (loc == NULL && origin != NULL && is_ref_attr (origin))
10437 sect_offset offset;
10439 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10440 offset = dwarf2_get_ref_die_offset (origin);
10441 if (!offset_in_cu_p (&cu->header, offset))
10443 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10444 binding can be done only inside one CU. Such referenced DIE
10445 therefore cannot be even moved to DW_TAG_partial_unit. */
10446 complaint (&symfile_complaints,
10447 _("DW_AT_abstract_origin offset is not in CU for "
10448 "DW_TAG_GNU_call_site child DIE 0x%x "
10450 child_die->offset.sect_off, objfile->name);
10453 parameter->u.param_offset.cu_off = (offset.sect_off
10454 - cu->header.offset.sect_off);
10456 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10458 complaint (&symfile_complaints,
10459 _("No DW_FORM_block* DW_AT_location for "
10460 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10461 child_die->offset.sect_off, objfile->name);
10466 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10467 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10468 if (parameter->u.dwarf_reg != -1)
10469 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10470 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10471 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10472 ¶meter->u.fb_offset))
10473 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10476 complaint (&symfile_complaints,
10477 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10478 "for DW_FORM_block* DW_AT_location is supported for "
10479 "DW_TAG_GNU_call_site child DIE 0x%x "
10481 child_die->offset.sect_off, objfile->name);
10486 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10487 if (!attr_form_is_block (attr))
10489 complaint (&symfile_complaints,
10490 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10491 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10492 child_die->offset.sect_off, objfile->name);
10495 parameter->value = DW_BLOCK (attr)->data;
10496 parameter->value_size = DW_BLOCK (attr)->size;
10498 /* Parameters are not pre-cleared by memset above. */
10499 parameter->data_value = NULL;
10500 parameter->data_value_size = 0;
10501 call_site->parameter_count++;
10503 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10506 if (!attr_form_is_block (attr))
10507 complaint (&symfile_complaints,
10508 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10509 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10510 child_die->offset.sect_off, objfile->name);
10513 parameter->data_value = DW_BLOCK (attr)->data;
10514 parameter->data_value_size = DW_BLOCK (attr)->size;
10520 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10521 Return 1 if the attributes are present and valid, otherwise, return 0.
10522 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10525 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10526 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10527 struct partial_symtab *ranges_pst)
10529 struct objfile *objfile = cu->objfile;
10530 struct comp_unit_head *cu_header = &cu->header;
10531 bfd *obfd = objfile->obfd;
10532 unsigned int addr_size = cu_header->addr_size;
10533 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10534 /* Base address selection entry. */
10537 unsigned int dummy;
10538 const gdb_byte *buffer;
10542 CORE_ADDR high = 0;
10543 CORE_ADDR baseaddr;
10545 found_base = cu->base_known;
10546 base = cu->base_address;
10548 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10549 if (offset >= dwarf2_per_objfile->ranges.size)
10551 complaint (&symfile_complaints,
10552 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10556 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10558 /* Read in the largest possible address. */
10559 marker = read_address (obfd, buffer, cu, &dummy);
10560 if ((marker & mask) == mask)
10562 /* If we found the largest possible address, then
10563 read the base address. */
10564 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10565 buffer += 2 * addr_size;
10566 offset += 2 * addr_size;
10572 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10576 CORE_ADDR range_beginning, range_end;
10578 range_beginning = read_address (obfd, buffer, cu, &dummy);
10579 buffer += addr_size;
10580 range_end = read_address (obfd, buffer, cu, &dummy);
10581 buffer += addr_size;
10582 offset += 2 * addr_size;
10584 /* An end of list marker is a pair of zero addresses. */
10585 if (range_beginning == 0 && range_end == 0)
10586 /* Found the end of list entry. */
10589 /* Each base address selection entry is a pair of 2 values.
10590 The first is the largest possible address, the second is
10591 the base address. Check for a base address here. */
10592 if ((range_beginning & mask) == mask)
10594 /* If we found the largest possible address, then
10595 read the base address. */
10596 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10603 /* We have no valid base address for the ranges
10605 complaint (&symfile_complaints,
10606 _("Invalid .debug_ranges data (no base address)"));
10610 if (range_beginning > range_end)
10612 /* Inverted range entries are invalid. */
10613 complaint (&symfile_complaints,
10614 _("Invalid .debug_ranges data (inverted range)"));
10618 /* Empty range entries have no effect. */
10619 if (range_beginning == range_end)
10622 range_beginning += base;
10625 /* A not-uncommon case of bad debug info.
10626 Don't pollute the addrmap with bad data. */
10627 if (range_beginning + baseaddr == 0
10628 && !dwarf2_per_objfile->has_section_at_zero)
10630 complaint (&symfile_complaints,
10631 _(".debug_ranges entry has start address of zero"
10632 " [in module %s]"), objfile->name);
10636 if (ranges_pst != NULL)
10637 addrmap_set_empty (objfile->psymtabs_addrmap,
10638 range_beginning + baseaddr,
10639 range_end - 1 + baseaddr,
10642 /* FIXME: This is recording everything as a low-high
10643 segment of consecutive addresses. We should have a
10644 data structure for discontiguous block ranges
10648 low = range_beginning;
10654 if (range_beginning < low)
10655 low = range_beginning;
10656 if (range_end > high)
10662 /* If the first entry is an end-of-list marker, the range
10663 describes an empty scope, i.e. no instructions. */
10669 *high_return = high;
10673 /* Get low and high pc attributes from a die. Return 1 if the attributes
10674 are present and valid, otherwise, return 0. Return -1 if the range is
10675 discontinuous, i.e. derived from DW_AT_ranges information. */
10678 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10679 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10680 struct partial_symtab *pst)
10682 struct attribute *attr;
10683 struct attribute *attr_high;
10685 CORE_ADDR high = 0;
10688 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10691 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10694 low = DW_ADDR (attr);
10695 if (attr_high->form == DW_FORM_addr
10696 || attr_high->form == DW_FORM_GNU_addr_index)
10697 high = DW_ADDR (attr_high);
10699 high = low + DW_UNSND (attr_high);
10702 /* Found high w/o low attribute. */
10705 /* Found consecutive range of addresses. */
10710 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10713 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10714 We take advantage of the fact that DW_AT_ranges does not appear
10715 in DW_TAG_compile_unit of DWO files. */
10716 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10717 unsigned int ranges_offset = (DW_UNSND (attr)
10718 + (need_ranges_base
10722 /* Value of the DW_AT_ranges attribute is the offset in the
10723 .debug_ranges section. */
10724 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10726 /* Found discontinuous range of addresses. */
10731 /* read_partial_die has also the strict LOW < HIGH requirement. */
10735 /* When using the GNU linker, .gnu.linkonce. sections are used to
10736 eliminate duplicate copies of functions and vtables and such.
10737 The linker will arbitrarily choose one and discard the others.
10738 The AT_*_pc values for such functions refer to local labels in
10739 these sections. If the section from that file was discarded, the
10740 labels are not in the output, so the relocs get a value of 0.
10741 If this is a discarded function, mark the pc bounds as invalid,
10742 so that GDB will ignore it. */
10743 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10752 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10753 its low and high PC addresses. Do nothing if these addresses could not
10754 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10755 and HIGHPC to the high address if greater than HIGHPC. */
10758 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10759 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10760 struct dwarf2_cu *cu)
10762 CORE_ADDR low, high;
10763 struct die_info *child = die->child;
10765 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10767 *lowpc = min (*lowpc, low);
10768 *highpc = max (*highpc, high);
10771 /* If the language does not allow nested subprograms (either inside
10772 subprograms or lexical blocks), we're done. */
10773 if (cu->language != language_ada)
10776 /* Check all the children of the given DIE. If it contains nested
10777 subprograms, then check their pc bounds. Likewise, we need to
10778 check lexical blocks as well, as they may also contain subprogram
10780 while (child && child->tag)
10782 if (child->tag == DW_TAG_subprogram
10783 || child->tag == DW_TAG_lexical_block)
10784 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10785 child = sibling_die (child);
10789 /* Get the low and high pc's represented by the scope DIE, and store
10790 them in *LOWPC and *HIGHPC. If the correct values can't be
10791 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10794 get_scope_pc_bounds (struct die_info *die,
10795 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10796 struct dwarf2_cu *cu)
10798 CORE_ADDR best_low = (CORE_ADDR) -1;
10799 CORE_ADDR best_high = (CORE_ADDR) 0;
10800 CORE_ADDR current_low, current_high;
10802 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10804 best_low = current_low;
10805 best_high = current_high;
10809 struct die_info *child = die->child;
10811 while (child && child->tag)
10813 switch (child->tag) {
10814 case DW_TAG_subprogram:
10815 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10817 case DW_TAG_namespace:
10818 case DW_TAG_module:
10819 /* FIXME: carlton/2004-01-16: Should we do this for
10820 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10821 that current GCC's always emit the DIEs corresponding
10822 to definitions of methods of classes as children of a
10823 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10824 the DIEs giving the declarations, which could be
10825 anywhere). But I don't see any reason why the
10826 standards says that they have to be there. */
10827 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10829 if (current_low != ((CORE_ADDR) -1))
10831 best_low = min (best_low, current_low);
10832 best_high = max (best_high, current_high);
10840 child = sibling_die (child);
10845 *highpc = best_high;
10848 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10852 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10853 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10855 struct objfile *objfile = cu->objfile;
10856 struct attribute *attr;
10857 struct attribute *attr_high;
10859 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10862 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10865 CORE_ADDR low = DW_ADDR (attr);
10867 if (attr_high->form == DW_FORM_addr
10868 || attr_high->form == DW_FORM_GNU_addr_index)
10869 high = DW_ADDR (attr_high);
10871 high = low + DW_UNSND (attr_high);
10873 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10877 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10880 bfd *obfd = objfile->obfd;
10881 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10882 We take advantage of the fact that DW_AT_ranges does not appear
10883 in DW_TAG_compile_unit of DWO files. */
10884 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10886 /* The value of the DW_AT_ranges attribute is the offset of the
10887 address range list in the .debug_ranges section. */
10888 unsigned long offset = (DW_UNSND (attr)
10889 + (need_ranges_base ? cu->ranges_base : 0));
10890 const gdb_byte *buffer;
10892 /* For some target architectures, but not others, the
10893 read_address function sign-extends the addresses it returns.
10894 To recognize base address selection entries, we need a
10896 unsigned int addr_size = cu->header.addr_size;
10897 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10899 /* The base address, to which the next pair is relative. Note
10900 that this 'base' is a DWARF concept: most entries in a range
10901 list are relative, to reduce the number of relocs against the
10902 debugging information. This is separate from this function's
10903 'baseaddr' argument, which GDB uses to relocate debugging
10904 information from a shared library based on the address at
10905 which the library was loaded. */
10906 CORE_ADDR base = cu->base_address;
10907 int base_known = cu->base_known;
10909 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10910 if (offset >= dwarf2_per_objfile->ranges.size)
10912 complaint (&symfile_complaints,
10913 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10917 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10921 unsigned int bytes_read;
10922 CORE_ADDR start, end;
10924 start = read_address (obfd, buffer, cu, &bytes_read);
10925 buffer += bytes_read;
10926 end = read_address (obfd, buffer, cu, &bytes_read);
10927 buffer += bytes_read;
10929 /* Did we find the end of the range list? */
10930 if (start == 0 && end == 0)
10933 /* Did we find a base address selection entry? */
10934 else if ((start & base_select_mask) == base_select_mask)
10940 /* We found an ordinary address range. */
10945 complaint (&symfile_complaints,
10946 _("Invalid .debug_ranges data "
10947 "(no base address)"));
10953 /* Inverted range entries are invalid. */
10954 complaint (&symfile_complaints,
10955 _("Invalid .debug_ranges data "
10956 "(inverted range)"));
10960 /* Empty range entries have no effect. */
10964 start += base + baseaddr;
10965 end += base + baseaddr;
10967 /* A not-uncommon case of bad debug info.
10968 Don't pollute the addrmap with bad data. */
10969 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10971 complaint (&symfile_complaints,
10972 _(".debug_ranges entry has start address of zero"
10973 " [in module %s]"), objfile->name);
10977 record_block_range (block, start, end - 1);
10983 /* Check whether the producer field indicates either of GCC < 4.6, or the
10984 Intel C/C++ compiler, and cache the result in CU. */
10987 check_producer (struct dwarf2_cu *cu)
10990 int major, minor, release;
10992 if (cu->producer == NULL)
10994 /* For unknown compilers expect their behavior is DWARF version
10997 GCC started to support .debug_types sections by -gdwarf-4 since
10998 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
10999 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
11000 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
11001 interpreted incorrectly by GDB now - GCC PR debug/48229. */
11003 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
11005 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
11007 cs = &cu->producer[strlen ("GNU ")];
11008 while (*cs && !isdigit (*cs))
11010 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
11012 /* Not recognized as GCC. */
11016 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
11017 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
11020 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
11021 cu->producer_is_icc = 1;
11024 /* For other non-GCC compilers, expect their behavior is DWARF version
11028 cu->checked_producer = 1;
11031 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
11032 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
11033 during 4.6.0 experimental. */
11036 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
11038 if (!cu->checked_producer)
11039 check_producer (cu);
11041 return cu->producer_is_gxx_lt_4_6;
11044 /* Return the default accessibility type if it is not overriden by
11045 DW_AT_accessibility. */
11047 static enum dwarf_access_attribute
11048 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
11050 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
11052 /* The default DWARF 2 accessibility for members is public, the default
11053 accessibility for inheritance is private. */
11055 if (die->tag != DW_TAG_inheritance)
11056 return DW_ACCESS_public;
11058 return DW_ACCESS_private;
11062 /* DWARF 3+ defines the default accessibility a different way. The same
11063 rules apply now for DW_TAG_inheritance as for the members and it only
11064 depends on the container kind. */
11066 if (die->parent->tag == DW_TAG_class_type)
11067 return DW_ACCESS_private;
11069 return DW_ACCESS_public;
11073 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
11074 offset. If the attribute was not found return 0, otherwise return
11075 1. If it was found but could not properly be handled, set *OFFSET
11079 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
11082 struct attribute *attr;
11084 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
11089 /* Note that we do not check for a section offset first here.
11090 This is because DW_AT_data_member_location is new in DWARF 4,
11091 so if we see it, we can assume that a constant form is really
11092 a constant and not a section offset. */
11093 if (attr_form_is_constant (attr))
11094 *offset = dwarf2_get_attr_constant_value (attr, 0);
11095 else if (attr_form_is_section_offset (attr))
11096 dwarf2_complex_location_expr_complaint ();
11097 else if (attr_form_is_block (attr))
11098 *offset = decode_locdesc (DW_BLOCK (attr), cu);
11100 dwarf2_complex_location_expr_complaint ();
11108 /* Add an aggregate field to the field list. */
11111 dwarf2_add_field (struct field_info *fip, struct die_info *die,
11112 struct dwarf2_cu *cu)
11114 struct objfile *objfile = cu->objfile;
11115 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11116 struct nextfield *new_field;
11117 struct attribute *attr;
11119 const char *fieldname = "";
11121 /* Allocate a new field list entry and link it in. */
11122 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
11123 make_cleanup (xfree, new_field);
11124 memset (new_field, 0, sizeof (struct nextfield));
11126 if (die->tag == DW_TAG_inheritance)
11128 new_field->next = fip->baseclasses;
11129 fip->baseclasses = new_field;
11133 new_field->next = fip->fields;
11134 fip->fields = new_field;
11138 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11140 new_field->accessibility = DW_UNSND (attr);
11142 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
11143 if (new_field->accessibility != DW_ACCESS_public)
11144 fip->non_public_fields = 1;
11146 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11148 new_field->virtuality = DW_UNSND (attr);
11150 new_field->virtuality = DW_VIRTUALITY_none;
11152 fp = &new_field->field;
11154 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
11158 /* Data member other than a C++ static data member. */
11160 /* Get type of field. */
11161 fp->type = die_type (die, cu);
11163 SET_FIELD_BITPOS (*fp, 0);
11165 /* Get bit size of field (zero if none). */
11166 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
11169 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
11173 FIELD_BITSIZE (*fp) = 0;
11176 /* Get bit offset of field. */
11177 if (handle_data_member_location (die, cu, &offset))
11178 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11179 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
11182 if (gdbarch_bits_big_endian (gdbarch))
11184 /* For big endian bits, the DW_AT_bit_offset gives the
11185 additional bit offset from the MSB of the containing
11186 anonymous object to the MSB of the field. We don't
11187 have to do anything special since we don't need to
11188 know the size of the anonymous object. */
11189 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
11193 /* For little endian bits, compute the bit offset to the
11194 MSB of the anonymous object, subtract off the number of
11195 bits from the MSB of the field to the MSB of the
11196 object, and then subtract off the number of bits of
11197 the field itself. The result is the bit offset of
11198 the LSB of the field. */
11199 int anonymous_size;
11200 int bit_offset = DW_UNSND (attr);
11202 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11205 /* The size of the anonymous object containing
11206 the bit field is explicit, so use the
11207 indicated size (in bytes). */
11208 anonymous_size = DW_UNSND (attr);
11212 /* The size of the anonymous object containing
11213 the bit field must be inferred from the type
11214 attribute of the data member containing the
11216 anonymous_size = TYPE_LENGTH (fp->type);
11218 SET_FIELD_BITPOS (*fp,
11219 (FIELD_BITPOS (*fp)
11220 + anonymous_size * bits_per_byte
11221 - bit_offset - FIELD_BITSIZE (*fp)));
11225 /* Get name of field. */
11226 fieldname = dwarf2_name (die, cu);
11227 if (fieldname == NULL)
11230 /* The name is already allocated along with this objfile, so we don't
11231 need to duplicate it for the type. */
11232 fp->name = fieldname;
11234 /* Change accessibility for artificial fields (e.g. virtual table
11235 pointer or virtual base class pointer) to private. */
11236 if (dwarf2_attr (die, DW_AT_artificial, cu))
11238 FIELD_ARTIFICIAL (*fp) = 1;
11239 new_field->accessibility = DW_ACCESS_private;
11240 fip->non_public_fields = 1;
11243 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
11245 /* C++ static member. */
11247 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
11248 is a declaration, but all versions of G++ as of this writing
11249 (so through at least 3.2.1) incorrectly generate
11250 DW_TAG_variable tags. */
11252 const char *physname;
11254 /* Get name of field. */
11255 fieldname = dwarf2_name (die, cu);
11256 if (fieldname == NULL)
11259 attr = dwarf2_attr (die, DW_AT_const_value, cu);
11261 /* Only create a symbol if this is an external value.
11262 new_symbol checks this and puts the value in the global symbol
11263 table, which we want. If it is not external, new_symbol
11264 will try to put the value in cu->list_in_scope which is wrong. */
11265 && dwarf2_flag_true_p (die, DW_AT_external, cu))
11267 /* A static const member, not much different than an enum as far as
11268 we're concerned, except that we can support more types. */
11269 new_symbol (die, NULL, cu);
11272 /* Get physical name. */
11273 physname = dwarf2_physname (fieldname, die, cu);
11275 /* The name is already allocated along with this objfile, so we don't
11276 need to duplicate it for the type. */
11277 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
11278 FIELD_TYPE (*fp) = die_type (die, cu);
11279 FIELD_NAME (*fp) = fieldname;
11281 else if (die->tag == DW_TAG_inheritance)
11285 /* C++ base class field. */
11286 if (handle_data_member_location (die, cu, &offset))
11287 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11288 FIELD_BITSIZE (*fp) = 0;
11289 FIELD_TYPE (*fp) = die_type (die, cu);
11290 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
11291 fip->nbaseclasses++;
11295 /* Add a typedef defined in the scope of the FIP's class. */
11298 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
11299 struct dwarf2_cu *cu)
11301 struct objfile *objfile = cu->objfile;
11302 struct typedef_field_list *new_field;
11303 struct attribute *attr;
11304 struct typedef_field *fp;
11305 char *fieldname = "";
11307 /* Allocate a new field list entry and link it in. */
11308 new_field = xzalloc (sizeof (*new_field));
11309 make_cleanup (xfree, new_field);
11311 gdb_assert (die->tag == DW_TAG_typedef);
11313 fp = &new_field->field;
11315 /* Get name of field. */
11316 fp->name = dwarf2_name (die, cu);
11317 if (fp->name == NULL)
11320 fp->type = read_type_die (die, cu);
11322 new_field->next = fip->typedef_field_list;
11323 fip->typedef_field_list = new_field;
11324 fip->typedef_field_list_count++;
11327 /* Create the vector of fields, and attach it to the type. */
11330 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
11331 struct dwarf2_cu *cu)
11333 int nfields = fip->nfields;
11335 /* Record the field count, allocate space for the array of fields,
11336 and create blank accessibility bitfields if necessary. */
11337 TYPE_NFIELDS (type) = nfields;
11338 TYPE_FIELDS (type) = (struct field *)
11339 TYPE_ALLOC (type, sizeof (struct field) * nfields);
11340 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
11342 if (fip->non_public_fields && cu->language != language_ada)
11344 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11346 TYPE_FIELD_PRIVATE_BITS (type) =
11347 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11348 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
11350 TYPE_FIELD_PROTECTED_BITS (type) =
11351 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11352 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
11354 TYPE_FIELD_IGNORE_BITS (type) =
11355 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11356 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
11359 /* If the type has baseclasses, allocate and clear a bit vector for
11360 TYPE_FIELD_VIRTUAL_BITS. */
11361 if (fip->nbaseclasses && cu->language != language_ada)
11363 int num_bytes = B_BYTES (fip->nbaseclasses);
11364 unsigned char *pointer;
11366 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11367 pointer = TYPE_ALLOC (type, num_bytes);
11368 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
11369 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
11370 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
11373 /* Copy the saved-up fields into the field vector. Start from the head of
11374 the list, adding to the tail of the field array, so that they end up in
11375 the same order in the array in which they were added to the list. */
11376 while (nfields-- > 0)
11378 struct nextfield *fieldp;
11382 fieldp = fip->fields;
11383 fip->fields = fieldp->next;
11387 fieldp = fip->baseclasses;
11388 fip->baseclasses = fieldp->next;
11391 TYPE_FIELD (type, nfields) = fieldp->field;
11392 switch (fieldp->accessibility)
11394 case DW_ACCESS_private:
11395 if (cu->language != language_ada)
11396 SET_TYPE_FIELD_PRIVATE (type, nfields);
11399 case DW_ACCESS_protected:
11400 if (cu->language != language_ada)
11401 SET_TYPE_FIELD_PROTECTED (type, nfields);
11404 case DW_ACCESS_public:
11408 /* Unknown accessibility. Complain and treat it as public. */
11410 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11411 fieldp->accessibility);
11415 if (nfields < fip->nbaseclasses)
11417 switch (fieldp->virtuality)
11419 case DW_VIRTUALITY_virtual:
11420 case DW_VIRTUALITY_pure_virtual:
11421 if (cu->language == language_ada)
11422 error (_("unexpected virtuality in component of Ada type"));
11423 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11430 /* Return true if this member function is a constructor, false
11434 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11436 const char *fieldname;
11437 const char *typename;
11440 if (die->parent == NULL)
11443 if (die->parent->tag != DW_TAG_structure_type
11444 && die->parent->tag != DW_TAG_union_type
11445 && die->parent->tag != DW_TAG_class_type)
11448 fieldname = dwarf2_name (die, cu);
11449 typename = dwarf2_name (die->parent, cu);
11450 if (fieldname == NULL || typename == NULL)
11453 len = strlen (fieldname);
11454 return (strncmp (fieldname, typename, len) == 0
11455 && (typename[len] == '\0' || typename[len] == '<'));
11458 /* Add a member function to the proper fieldlist. */
11461 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11462 struct type *type, struct dwarf2_cu *cu)
11464 struct objfile *objfile = cu->objfile;
11465 struct attribute *attr;
11466 struct fnfieldlist *flp;
11468 struct fn_field *fnp;
11469 const char *fieldname;
11470 struct nextfnfield *new_fnfield;
11471 struct type *this_type;
11472 enum dwarf_access_attribute accessibility;
11474 if (cu->language == language_ada)
11475 error (_("unexpected member function in Ada type"));
11477 /* Get name of member function. */
11478 fieldname = dwarf2_name (die, cu);
11479 if (fieldname == NULL)
11482 /* Look up member function name in fieldlist. */
11483 for (i = 0; i < fip->nfnfields; i++)
11485 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11489 /* Create new list element if necessary. */
11490 if (i < fip->nfnfields)
11491 flp = &fip->fnfieldlists[i];
11494 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11496 fip->fnfieldlists = (struct fnfieldlist *)
11497 xrealloc (fip->fnfieldlists,
11498 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11499 * sizeof (struct fnfieldlist));
11500 if (fip->nfnfields == 0)
11501 make_cleanup (free_current_contents, &fip->fnfieldlists);
11503 flp = &fip->fnfieldlists[fip->nfnfields];
11504 flp->name = fieldname;
11507 i = fip->nfnfields++;
11510 /* Create a new member function field and chain it to the field list
11512 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11513 make_cleanup (xfree, new_fnfield);
11514 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11515 new_fnfield->next = flp->head;
11516 flp->head = new_fnfield;
11519 /* Fill in the member function field info. */
11520 fnp = &new_fnfield->fnfield;
11522 /* Delay processing of the physname until later. */
11523 if (cu->language == language_cplus || cu->language == language_java)
11525 add_to_method_list (type, i, flp->length - 1, fieldname,
11530 const char *physname = dwarf2_physname (fieldname, die, cu);
11531 fnp->physname = physname ? physname : "";
11534 fnp->type = alloc_type (objfile);
11535 this_type = read_type_die (die, cu);
11536 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11538 int nparams = TYPE_NFIELDS (this_type);
11540 /* TYPE is the domain of this method, and THIS_TYPE is the type
11541 of the method itself (TYPE_CODE_METHOD). */
11542 smash_to_method_type (fnp->type, type,
11543 TYPE_TARGET_TYPE (this_type),
11544 TYPE_FIELDS (this_type),
11545 TYPE_NFIELDS (this_type),
11546 TYPE_VARARGS (this_type));
11548 /* Handle static member functions.
11549 Dwarf2 has no clean way to discern C++ static and non-static
11550 member functions. G++ helps GDB by marking the first
11551 parameter for non-static member functions (which is the this
11552 pointer) as artificial. We obtain this information from
11553 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11554 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11555 fnp->voffset = VOFFSET_STATIC;
11558 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11559 dwarf2_full_name (fieldname, die, cu));
11561 /* Get fcontext from DW_AT_containing_type if present. */
11562 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11563 fnp->fcontext = die_containing_type (die, cu);
11565 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11566 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11568 /* Get accessibility. */
11569 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11571 accessibility = DW_UNSND (attr);
11573 accessibility = dwarf2_default_access_attribute (die, cu);
11574 switch (accessibility)
11576 case DW_ACCESS_private:
11577 fnp->is_private = 1;
11579 case DW_ACCESS_protected:
11580 fnp->is_protected = 1;
11584 /* Check for artificial methods. */
11585 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11586 if (attr && DW_UNSND (attr) != 0)
11587 fnp->is_artificial = 1;
11589 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11591 /* Get index in virtual function table if it is a virtual member
11592 function. For older versions of GCC, this is an offset in the
11593 appropriate virtual table, as specified by DW_AT_containing_type.
11594 For everyone else, it is an expression to be evaluated relative
11595 to the object address. */
11597 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11600 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11602 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11604 /* Old-style GCC. */
11605 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11607 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11608 || (DW_BLOCK (attr)->size > 1
11609 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11610 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11612 struct dwarf_block blk;
11615 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11617 blk.size = DW_BLOCK (attr)->size - offset;
11618 blk.data = DW_BLOCK (attr)->data + offset;
11619 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11620 if ((fnp->voffset % cu->header.addr_size) != 0)
11621 dwarf2_complex_location_expr_complaint ();
11623 fnp->voffset /= cu->header.addr_size;
11627 dwarf2_complex_location_expr_complaint ();
11629 if (!fnp->fcontext)
11630 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11632 else if (attr_form_is_section_offset (attr))
11634 dwarf2_complex_location_expr_complaint ();
11638 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11644 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11645 if (attr && DW_UNSND (attr))
11647 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11648 complaint (&symfile_complaints,
11649 _("Member function \"%s\" (offset %d) is virtual "
11650 "but the vtable offset is not specified"),
11651 fieldname, die->offset.sect_off);
11652 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11653 TYPE_CPLUS_DYNAMIC (type) = 1;
11658 /* Create the vector of member function fields, and attach it to the type. */
11661 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11662 struct dwarf2_cu *cu)
11664 struct fnfieldlist *flp;
11667 if (cu->language == language_ada)
11668 error (_("unexpected member functions in Ada type"));
11670 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11671 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11672 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11674 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11676 struct nextfnfield *nfp = flp->head;
11677 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11680 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11681 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11682 fn_flp->fn_fields = (struct fn_field *)
11683 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11684 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11685 fn_flp->fn_fields[k] = nfp->fnfield;
11688 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11691 /* Returns non-zero if NAME is the name of a vtable member in CU's
11692 language, zero otherwise. */
11694 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11696 static const char vptr[] = "_vptr";
11697 static const char vtable[] = "vtable";
11699 /* Look for the C++ and Java forms of the vtable. */
11700 if ((cu->language == language_java
11701 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11702 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11703 && is_cplus_marker (name[sizeof (vptr) - 1])))
11709 /* GCC outputs unnamed structures that are really pointers to member
11710 functions, with the ABI-specified layout. If TYPE describes
11711 such a structure, smash it into a member function type.
11713 GCC shouldn't do this; it should just output pointer to member DIEs.
11714 This is GCC PR debug/28767. */
11717 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11719 struct type *pfn_type, *domain_type, *new_type;
11721 /* Check for a structure with no name and two children. */
11722 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11725 /* Check for __pfn and __delta members. */
11726 if (TYPE_FIELD_NAME (type, 0) == NULL
11727 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11728 || TYPE_FIELD_NAME (type, 1) == NULL
11729 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11732 /* Find the type of the method. */
11733 pfn_type = TYPE_FIELD_TYPE (type, 0);
11734 if (pfn_type == NULL
11735 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11736 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11739 /* Look for the "this" argument. */
11740 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11741 if (TYPE_NFIELDS (pfn_type) == 0
11742 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11743 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11746 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11747 new_type = alloc_type (objfile);
11748 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11749 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11750 TYPE_VARARGS (pfn_type));
11751 smash_to_methodptr_type (type, new_type);
11754 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11758 producer_is_icc (struct dwarf2_cu *cu)
11760 if (!cu->checked_producer)
11761 check_producer (cu);
11763 return cu->producer_is_icc;
11766 /* Called when we find the DIE that starts a structure or union scope
11767 (definition) to create a type for the structure or union. Fill in
11768 the type's name and general properties; the members will not be
11769 processed until process_structure_scope.
11771 NOTE: we need to call these functions regardless of whether or not the
11772 DIE has a DW_AT_name attribute, since it might be an anonymous
11773 structure or union. This gets the type entered into our set of
11774 user defined types.
11776 However, if the structure is incomplete (an opaque struct/union)
11777 then suppress creating a symbol table entry for it since gdb only
11778 wants to find the one with the complete definition. Note that if
11779 it is complete, we just call new_symbol, which does it's own
11780 checking about whether the struct/union is anonymous or not (and
11781 suppresses creating a symbol table entry itself). */
11783 static struct type *
11784 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11786 struct objfile *objfile = cu->objfile;
11788 struct attribute *attr;
11791 /* If the definition of this type lives in .debug_types, read that type.
11792 Don't follow DW_AT_specification though, that will take us back up
11793 the chain and we want to go down. */
11794 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11797 type = get_DW_AT_signature_type (die, attr, cu);
11799 /* The type's CU may not be the same as CU.
11800 Ensure TYPE is recorded with CU in die_type_hash. */
11801 return set_die_type (die, type, cu);
11804 type = alloc_type (objfile);
11805 INIT_CPLUS_SPECIFIC (type);
11807 name = dwarf2_name (die, cu);
11810 if (cu->language == language_cplus
11811 || cu->language == language_java)
11813 const char *full_name = dwarf2_full_name (name, die, cu);
11815 /* dwarf2_full_name might have already finished building the DIE's
11816 type. If so, there is no need to continue. */
11817 if (get_die_type (die, cu) != NULL)
11818 return get_die_type (die, cu);
11820 TYPE_TAG_NAME (type) = full_name;
11821 if (die->tag == DW_TAG_structure_type
11822 || die->tag == DW_TAG_class_type)
11823 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11827 /* The name is already allocated along with this objfile, so
11828 we don't need to duplicate it for the type. */
11829 TYPE_TAG_NAME (type) = name;
11830 if (die->tag == DW_TAG_class_type)
11831 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11835 if (die->tag == DW_TAG_structure_type)
11837 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11839 else if (die->tag == DW_TAG_union_type)
11841 TYPE_CODE (type) = TYPE_CODE_UNION;
11845 TYPE_CODE (type) = TYPE_CODE_CLASS;
11848 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11849 TYPE_DECLARED_CLASS (type) = 1;
11851 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11854 TYPE_LENGTH (type) = DW_UNSND (attr);
11858 TYPE_LENGTH (type) = 0;
11861 if (producer_is_icc (cu))
11863 /* ICC does not output the required DW_AT_declaration
11864 on incomplete types, but gives them a size of zero. */
11867 TYPE_STUB_SUPPORTED (type) = 1;
11869 if (die_is_declaration (die, cu))
11870 TYPE_STUB (type) = 1;
11871 else if (attr == NULL && die->child == NULL
11872 && producer_is_realview (cu->producer))
11873 /* RealView does not output the required DW_AT_declaration
11874 on incomplete types. */
11875 TYPE_STUB (type) = 1;
11877 /* We need to add the type field to the die immediately so we don't
11878 infinitely recurse when dealing with pointers to the structure
11879 type within the structure itself. */
11880 set_die_type (die, type, cu);
11882 /* set_die_type should be already done. */
11883 set_descriptive_type (type, die, cu);
11888 /* Finish creating a structure or union type, including filling in
11889 its members and creating a symbol for it. */
11892 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11894 struct objfile *objfile = cu->objfile;
11895 struct die_info *child_die = die->child;
11898 type = get_die_type (die, cu);
11900 type = read_structure_type (die, cu);
11902 if (die->child != NULL && ! die_is_declaration (die, cu))
11904 struct field_info fi;
11905 struct die_info *child_die;
11906 VEC (symbolp) *template_args = NULL;
11907 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11909 memset (&fi, 0, sizeof (struct field_info));
11911 child_die = die->child;
11913 while (child_die && child_die->tag)
11915 if (child_die->tag == DW_TAG_member
11916 || child_die->tag == DW_TAG_variable)
11918 /* NOTE: carlton/2002-11-05: A C++ static data member
11919 should be a DW_TAG_member that is a declaration, but
11920 all versions of G++ as of this writing (so through at
11921 least 3.2.1) incorrectly generate DW_TAG_variable
11922 tags for them instead. */
11923 dwarf2_add_field (&fi, child_die, cu);
11925 else if (child_die->tag == DW_TAG_subprogram)
11927 /* C++ member function. */
11928 dwarf2_add_member_fn (&fi, child_die, type, cu);
11930 else if (child_die->tag == DW_TAG_inheritance)
11932 /* C++ base class field. */
11933 dwarf2_add_field (&fi, child_die, cu);
11935 else if (child_die->tag == DW_TAG_typedef)
11936 dwarf2_add_typedef (&fi, child_die, cu);
11937 else if (child_die->tag == DW_TAG_template_type_param
11938 || child_die->tag == DW_TAG_template_value_param)
11940 struct symbol *arg = new_symbol (child_die, NULL, cu);
11943 VEC_safe_push (symbolp, template_args, arg);
11946 child_die = sibling_die (child_die);
11949 /* Attach template arguments to type. */
11950 if (! VEC_empty (symbolp, template_args))
11952 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11953 TYPE_N_TEMPLATE_ARGUMENTS (type)
11954 = VEC_length (symbolp, template_args);
11955 TYPE_TEMPLATE_ARGUMENTS (type)
11956 = obstack_alloc (&objfile->objfile_obstack,
11957 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11958 * sizeof (struct symbol *)));
11959 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11960 VEC_address (symbolp, template_args),
11961 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11962 * sizeof (struct symbol *)));
11963 VEC_free (symbolp, template_args);
11966 /* Attach fields and member functions to the type. */
11968 dwarf2_attach_fields_to_type (&fi, type, cu);
11971 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11973 /* Get the type which refers to the base class (possibly this
11974 class itself) which contains the vtable pointer for the current
11975 class from the DW_AT_containing_type attribute. This use of
11976 DW_AT_containing_type is a GNU extension. */
11978 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11980 struct type *t = die_containing_type (die, cu);
11982 TYPE_VPTR_BASETYPE (type) = t;
11987 /* Our own class provides vtbl ptr. */
11988 for (i = TYPE_NFIELDS (t) - 1;
11989 i >= TYPE_N_BASECLASSES (t);
11992 const char *fieldname = TYPE_FIELD_NAME (t, i);
11994 if (is_vtable_name (fieldname, cu))
11996 TYPE_VPTR_FIELDNO (type) = i;
12001 /* Complain if virtual function table field not found. */
12002 if (i < TYPE_N_BASECLASSES (t))
12003 complaint (&symfile_complaints,
12004 _("virtual function table pointer "
12005 "not found when defining class '%s'"),
12006 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
12011 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
12014 else if (cu->producer
12015 && strncmp (cu->producer,
12016 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
12018 /* The IBM XLC compiler does not provide direct indication
12019 of the containing type, but the vtable pointer is
12020 always named __vfp. */
12024 for (i = TYPE_NFIELDS (type) - 1;
12025 i >= TYPE_N_BASECLASSES (type);
12028 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
12030 TYPE_VPTR_FIELDNO (type) = i;
12031 TYPE_VPTR_BASETYPE (type) = type;
12038 /* Copy fi.typedef_field_list linked list elements content into the
12039 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
12040 if (fi.typedef_field_list)
12042 int i = fi.typedef_field_list_count;
12044 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12045 TYPE_TYPEDEF_FIELD_ARRAY (type)
12046 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
12047 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
12049 /* Reverse the list order to keep the debug info elements order. */
12052 struct typedef_field *dest, *src;
12054 dest = &TYPE_TYPEDEF_FIELD (type, i);
12055 src = &fi.typedef_field_list->field;
12056 fi.typedef_field_list = fi.typedef_field_list->next;
12061 do_cleanups (back_to);
12063 if (HAVE_CPLUS_STRUCT (type))
12064 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
12067 quirk_gcc_member_function_pointer (type, objfile);
12069 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
12070 snapshots) has been known to create a die giving a declaration
12071 for a class that has, as a child, a die giving a definition for a
12072 nested class. So we have to process our children even if the
12073 current die is a declaration. Normally, of course, a declaration
12074 won't have any children at all. */
12076 while (child_die != NULL && child_die->tag)
12078 if (child_die->tag == DW_TAG_member
12079 || child_die->tag == DW_TAG_variable
12080 || child_die->tag == DW_TAG_inheritance
12081 || child_die->tag == DW_TAG_template_value_param
12082 || child_die->tag == DW_TAG_template_type_param)
12087 process_die (child_die, cu);
12089 child_die = sibling_die (child_die);
12092 /* Do not consider external references. According to the DWARF standard,
12093 these DIEs are identified by the fact that they have no byte_size
12094 attribute, and a declaration attribute. */
12095 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
12096 || !die_is_declaration (die, cu))
12097 new_symbol (die, type, cu);
12100 /* Given a DW_AT_enumeration_type die, set its type. We do not
12101 complete the type's fields yet, or create any symbols. */
12103 static struct type *
12104 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
12106 struct objfile *objfile = cu->objfile;
12108 struct attribute *attr;
12111 /* If the definition of this type lives in .debug_types, read that type.
12112 Don't follow DW_AT_specification though, that will take us back up
12113 the chain and we want to go down. */
12114 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12117 type = get_DW_AT_signature_type (die, attr, cu);
12119 /* The type's CU may not be the same as CU.
12120 Ensure TYPE is recorded with CU in die_type_hash. */
12121 return set_die_type (die, type, cu);
12124 type = alloc_type (objfile);
12126 TYPE_CODE (type) = TYPE_CODE_ENUM;
12127 name = dwarf2_full_name (NULL, die, cu);
12129 TYPE_TAG_NAME (type) = name;
12131 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12134 TYPE_LENGTH (type) = DW_UNSND (attr);
12138 TYPE_LENGTH (type) = 0;
12141 /* The enumeration DIE can be incomplete. In Ada, any type can be
12142 declared as private in the package spec, and then defined only
12143 inside the package body. Such types are known as Taft Amendment
12144 Types. When another package uses such a type, an incomplete DIE
12145 may be generated by the compiler. */
12146 if (die_is_declaration (die, cu))
12147 TYPE_STUB (type) = 1;
12149 return set_die_type (die, type, cu);
12152 /* Given a pointer to a die which begins an enumeration, process all
12153 the dies that define the members of the enumeration, and create the
12154 symbol for the enumeration type.
12156 NOTE: We reverse the order of the element list. */
12159 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
12161 struct type *this_type;
12163 this_type = get_die_type (die, cu);
12164 if (this_type == NULL)
12165 this_type = read_enumeration_type (die, cu);
12167 if (die->child != NULL)
12169 struct die_info *child_die;
12170 struct symbol *sym;
12171 struct field *fields = NULL;
12172 int num_fields = 0;
12173 int unsigned_enum = 1;
12178 child_die = die->child;
12179 while (child_die && child_die->tag)
12181 if (child_die->tag != DW_TAG_enumerator)
12183 process_die (child_die, cu);
12187 name = dwarf2_name (child_die, cu);
12190 sym = new_symbol (child_die, this_type, cu);
12191 if (SYMBOL_VALUE (sym) < 0)
12196 else if ((mask & SYMBOL_VALUE (sym)) != 0)
12199 mask |= SYMBOL_VALUE (sym);
12201 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
12203 fields = (struct field *)
12205 (num_fields + DW_FIELD_ALLOC_CHUNK)
12206 * sizeof (struct field));
12209 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
12210 FIELD_TYPE (fields[num_fields]) = NULL;
12211 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
12212 FIELD_BITSIZE (fields[num_fields]) = 0;
12218 child_die = sibling_die (child_die);
12223 TYPE_NFIELDS (this_type) = num_fields;
12224 TYPE_FIELDS (this_type) = (struct field *)
12225 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
12226 memcpy (TYPE_FIELDS (this_type), fields,
12227 sizeof (struct field) * num_fields);
12231 TYPE_UNSIGNED (this_type) = 1;
12233 TYPE_FLAG_ENUM (this_type) = 1;
12236 /* If we are reading an enum from a .debug_types unit, and the enum
12237 is a declaration, and the enum is not the signatured type in the
12238 unit, then we do not want to add a symbol for it. Adding a
12239 symbol would in some cases obscure the true definition of the
12240 enum, giving users an incomplete type when the definition is
12241 actually available. Note that we do not want to do this for all
12242 enums which are just declarations, because C++0x allows forward
12243 enum declarations. */
12244 if (cu->per_cu->is_debug_types
12245 && die_is_declaration (die, cu))
12247 struct signatured_type *sig_type;
12249 sig_type = (struct signatured_type *) cu->per_cu;
12250 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
12251 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
12255 new_symbol (die, this_type, cu);
12258 /* Extract all information from a DW_TAG_array_type DIE and put it in
12259 the DIE's type field. For now, this only handles one dimensional
12262 static struct type *
12263 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
12265 struct objfile *objfile = cu->objfile;
12266 struct die_info *child_die;
12268 struct type *element_type, *range_type, *index_type;
12269 struct type **range_types = NULL;
12270 struct attribute *attr;
12272 struct cleanup *back_to;
12275 element_type = die_type (die, cu);
12277 /* The die_type call above may have already set the type for this DIE. */
12278 type = get_die_type (die, cu);
12282 /* Irix 6.2 native cc creates array types without children for
12283 arrays with unspecified length. */
12284 if (die->child == NULL)
12286 index_type = objfile_type (objfile)->builtin_int;
12287 range_type = create_range_type (NULL, index_type, 0, -1);
12288 type = create_array_type (NULL, element_type, range_type);
12289 return set_die_type (die, type, cu);
12292 back_to = make_cleanup (null_cleanup, NULL);
12293 child_die = die->child;
12294 while (child_die && child_die->tag)
12296 if (child_die->tag == DW_TAG_subrange_type)
12298 struct type *child_type = read_type_die (child_die, cu);
12300 if (child_type != NULL)
12302 /* The range type was succesfully read. Save it for the
12303 array type creation. */
12304 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
12306 range_types = (struct type **)
12307 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
12308 * sizeof (struct type *));
12310 make_cleanup (free_current_contents, &range_types);
12312 range_types[ndim++] = child_type;
12315 child_die = sibling_die (child_die);
12318 /* Dwarf2 dimensions are output from left to right, create the
12319 necessary array types in backwards order. */
12321 type = element_type;
12323 if (read_array_order (die, cu) == DW_ORD_col_major)
12328 type = create_array_type (NULL, type, range_types[i++]);
12333 type = create_array_type (NULL, type, range_types[ndim]);
12336 /* Understand Dwarf2 support for vector types (like they occur on
12337 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
12338 array type. This is not part of the Dwarf2/3 standard yet, but a
12339 custom vendor extension. The main difference between a regular
12340 array and the vector variant is that vectors are passed by value
12342 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
12344 make_vector_type (type);
12346 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
12347 implementation may choose to implement triple vectors using this
12349 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12352 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
12353 TYPE_LENGTH (type) = DW_UNSND (attr);
12355 complaint (&symfile_complaints,
12356 _("DW_AT_byte_size for array type smaller "
12357 "than the total size of elements"));
12360 name = dwarf2_name (die, cu);
12362 TYPE_NAME (type) = name;
12364 /* Install the type in the die. */
12365 set_die_type (die, type, cu);
12367 /* set_die_type should be already done. */
12368 set_descriptive_type (type, die, cu);
12370 do_cleanups (back_to);
12375 static enum dwarf_array_dim_ordering
12376 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
12378 struct attribute *attr;
12380 attr = dwarf2_attr (die, DW_AT_ordering, cu);
12382 if (attr) return DW_SND (attr);
12384 /* GNU F77 is a special case, as at 08/2004 array type info is the
12385 opposite order to the dwarf2 specification, but data is still
12386 laid out as per normal fortran.
12388 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
12389 version checking. */
12391 if (cu->language == language_fortran
12392 && cu->producer && strstr (cu->producer, "GNU F77"))
12394 return DW_ORD_row_major;
12397 switch (cu->language_defn->la_array_ordering)
12399 case array_column_major:
12400 return DW_ORD_col_major;
12401 case array_row_major:
12403 return DW_ORD_row_major;
12407 /* Extract all information from a DW_TAG_set_type DIE and put it in
12408 the DIE's type field. */
12410 static struct type *
12411 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12413 struct type *domain_type, *set_type;
12414 struct attribute *attr;
12416 domain_type = die_type (die, cu);
12418 /* The die_type call above may have already set the type for this DIE. */
12419 set_type = get_die_type (die, cu);
12423 set_type = create_set_type (NULL, domain_type);
12425 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12427 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12429 return set_die_type (die, set_type, cu);
12432 /* A helper for read_common_block that creates a locexpr baton.
12433 SYM is the symbol which we are marking as computed.
12434 COMMON_DIE is the DIE for the common block.
12435 COMMON_LOC is the location expression attribute for the common
12437 MEMBER_LOC is the location expression attribute for the particular
12438 member of the common block that we are processing.
12439 CU is the CU from which the above come. */
12442 mark_common_block_symbol_computed (struct symbol *sym,
12443 struct die_info *common_die,
12444 struct attribute *common_loc,
12445 struct attribute *member_loc,
12446 struct dwarf2_cu *cu)
12448 struct objfile *objfile = dwarf2_per_objfile->objfile;
12449 struct dwarf2_locexpr_baton *baton;
12451 unsigned int cu_off;
12452 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12453 LONGEST offset = 0;
12455 gdb_assert (common_loc && member_loc);
12456 gdb_assert (attr_form_is_block (common_loc));
12457 gdb_assert (attr_form_is_block (member_loc)
12458 || attr_form_is_constant (member_loc));
12460 baton = obstack_alloc (&objfile->objfile_obstack,
12461 sizeof (struct dwarf2_locexpr_baton));
12462 baton->per_cu = cu->per_cu;
12463 gdb_assert (baton->per_cu);
12465 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12467 if (attr_form_is_constant (member_loc))
12469 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12470 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12473 baton->size += DW_BLOCK (member_loc)->size;
12475 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12478 *ptr++ = DW_OP_call4;
12479 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12480 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12483 if (attr_form_is_constant (member_loc))
12485 *ptr++ = DW_OP_addr;
12486 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12487 ptr += cu->header.addr_size;
12491 /* We have to copy the data here, because DW_OP_call4 will only
12492 use a DW_AT_location attribute. */
12493 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12494 ptr += DW_BLOCK (member_loc)->size;
12497 *ptr++ = DW_OP_plus;
12498 gdb_assert (ptr - baton->data == baton->size);
12500 SYMBOL_LOCATION_BATON (sym) = baton;
12501 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12504 /* Create appropriate locally-scoped variables for all the
12505 DW_TAG_common_block entries. Also create a struct common_block
12506 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12507 is used to sepate the common blocks name namespace from regular
12511 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12513 struct attribute *attr;
12515 attr = dwarf2_attr (die, DW_AT_location, cu);
12518 /* Support the .debug_loc offsets. */
12519 if (attr_form_is_block (attr))
12523 else if (attr_form_is_section_offset (attr))
12525 dwarf2_complex_location_expr_complaint ();
12530 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12531 "common block member");
12536 if (die->child != NULL)
12538 struct objfile *objfile = cu->objfile;
12539 struct die_info *child_die;
12540 size_t n_entries = 0, size;
12541 struct common_block *common_block;
12542 struct symbol *sym;
12544 for (child_die = die->child;
12545 child_die && child_die->tag;
12546 child_die = sibling_die (child_die))
12549 size = (sizeof (struct common_block)
12550 + (n_entries - 1) * sizeof (struct symbol *));
12551 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12552 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12553 common_block->n_entries = 0;
12555 for (child_die = die->child;
12556 child_die && child_die->tag;
12557 child_die = sibling_die (child_die))
12559 /* Create the symbol in the DW_TAG_common_block block in the current
12561 sym = new_symbol (child_die, NULL, cu);
12564 struct attribute *member_loc;
12566 common_block->contents[common_block->n_entries++] = sym;
12568 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12572 /* GDB has handled this for a long time, but it is
12573 not specified by DWARF. It seems to have been
12574 emitted by gfortran at least as recently as:
12575 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12576 complaint (&symfile_complaints,
12577 _("Variable in common block has "
12578 "DW_AT_data_member_location "
12579 "- DIE at 0x%x [in module %s]"),
12580 child_die->offset.sect_off, cu->objfile->name);
12582 if (attr_form_is_section_offset (member_loc))
12583 dwarf2_complex_location_expr_complaint ();
12584 else if (attr_form_is_constant (member_loc)
12585 || attr_form_is_block (member_loc))
12588 mark_common_block_symbol_computed (sym, die, attr,
12592 dwarf2_complex_location_expr_complaint ();
12597 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12598 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12602 /* Create a type for a C++ namespace. */
12604 static struct type *
12605 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12607 struct objfile *objfile = cu->objfile;
12608 const char *previous_prefix, *name;
12612 /* For extensions, reuse the type of the original namespace. */
12613 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12615 struct die_info *ext_die;
12616 struct dwarf2_cu *ext_cu = cu;
12618 ext_die = dwarf2_extension (die, &ext_cu);
12619 type = read_type_die (ext_die, ext_cu);
12621 /* EXT_CU may not be the same as CU.
12622 Ensure TYPE is recorded with CU in die_type_hash. */
12623 return set_die_type (die, type, cu);
12626 name = namespace_name (die, &is_anonymous, cu);
12628 /* Now build the name of the current namespace. */
12630 previous_prefix = determine_prefix (die, cu);
12631 if (previous_prefix[0] != '\0')
12632 name = typename_concat (&objfile->objfile_obstack,
12633 previous_prefix, name, 0, cu);
12635 /* Create the type. */
12636 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12638 TYPE_NAME (type) = name;
12639 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12641 return set_die_type (die, type, cu);
12644 /* Read a C++ namespace. */
12647 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12649 struct objfile *objfile = cu->objfile;
12652 /* Add a symbol associated to this if we haven't seen the namespace
12653 before. Also, add a using directive if it's an anonymous
12656 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12660 type = read_type_die (die, cu);
12661 new_symbol (die, type, cu);
12663 namespace_name (die, &is_anonymous, cu);
12666 const char *previous_prefix = determine_prefix (die, cu);
12668 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12669 NULL, NULL, 0, &objfile->objfile_obstack);
12673 if (die->child != NULL)
12675 struct die_info *child_die = die->child;
12677 while (child_die && child_die->tag)
12679 process_die (child_die, cu);
12680 child_die = sibling_die (child_die);
12685 /* Read a Fortran module as type. This DIE can be only a declaration used for
12686 imported module. Still we need that type as local Fortran "use ... only"
12687 declaration imports depend on the created type in determine_prefix. */
12689 static struct type *
12690 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12692 struct objfile *objfile = cu->objfile;
12693 const char *module_name;
12696 module_name = dwarf2_name (die, cu);
12698 complaint (&symfile_complaints,
12699 _("DW_TAG_module has no name, offset 0x%x"),
12700 die->offset.sect_off);
12701 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12703 /* determine_prefix uses TYPE_TAG_NAME. */
12704 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12706 return set_die_type (die, type, cu);
12709 /* Read a Fortran module. */
12712 read_module (struct die_info *die, struct dwarf2_cu *cu)
12714 struct die_info *child_die = die->child;
12716 while (child_die && child_die->tag)
12718 process_die (child_die, cu);
12719 child_die = sibling_die (child_die);
12723 /* Return the name of the namespace represented by DIE. Set
12724 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12727 static const char *
12728 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12730 struct die_info *current_die;
12731 const char *name = NULL;
12733 /* Loop through the extensions until we find a name. */
12735 for (current_die = die;
12736 current_die != NULL;
12737 current_die = dwarf2_extension (die, &cu))
12739 name = dwarf2_name (current_die, cu);
12744 /* Is it an anonymous namespace? */
12746 *is_anonymous = (name == NULL);
12748 name = CP_ANONYMOUS_NAMESPACE_STR;
12753 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12754 the user defined type vector. */
12756 static struct type *
12757 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12759 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12760 struct comp_unit_head *cu_header = &cu->header;
12762 struct attribute *attr_byte_size;
12763 struct attribute *attr_address_class;
12764 int byte_size, addr_class;
12765 struct type *target_type;
12767 target_type = die_type (die, cu);
12769 /* The die_type call above may have already set the type for this DIE. */
12770 type = get_die_type (die, cu);
12774 type = lookup_pointer_type (target_type);
12776 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12777 if (attr_byte_size)
12778 byte_size = DW_UNSND (attr_byte_size);
12780 byte_size = cu_header->addr_size;
12782 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12783 if (attr_address_class)
12784 addr_class = DW_UNSND (attr_address_class);
12786 addr_class = DW_ADDR_none;
12788 /* If the pointer size or address class is different than the
12789 default, create a type variant marked as such and set the
12790 length accordingly. */
12791 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12793 if (gdbarch_address_class_type_flags_p (gdbarch))
12797 type_flags = gdbarch_address_class_type_flags
12798 (gdbarch, byte_size, addr_class);
12799 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12801 type = make_type_with_address_space (type, type_flags);
12803 else if (TYPE_LENGTH (type) != byte_size)
12805 complaint (&symfile_complaints,
12806 _("invalid pointer size %d"), byte_size);
12810 /* Should we also complain about unhandled address classes? */
12814 TYPE_LENGTH (type) = byte_size;
12815 return set_die_type (die, type, cu);
12818 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12819 the user defined type vector. */
12821 static struct type *
12822 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12825 struct type *to_type;
12826 struct type *domain;
12828 to_type = die_type (die, cu);
12829 domain = die_containing_type (die, cu);
12831 /* The calls above may have already set the type for this DIE. */
12832 type = get_die_type (die, cu);
12836 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12837 type = lookup_methodptr_type (to_type);
12838 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12840 struct type *new_type = alloc_type (cu->objfile);
12842 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12843 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12844 TYPE_VARARGS (to_type));
12845 type = lookup_methodptr_type (new_type);
12848 type = lookup_memberptr_type (to_type, domain);
12850 return set_die_type (die, type, cu);
12853 /* Extract all information from a DW_TAG_reference_type DIE and add to
12854 the user defined type vector. */
12856 static struct type *
12857 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12859 struct comp_unit_head *cu_header = &cu->header;
12860 struct type *type, *target_type;
12861 struct attribute *attr;
12863 target_type = die_type (die, cu);
12865 /* The die_type call above may have already set the type for this DIE. */
12866 type = get_die_type (die, cu);
12870 type = lookup_reference_type (target_type);
12871 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12874 TYPE_LENGTH (type) = DW_UNSND (attr);
12878 TYPE_LENGTH (type) = cu_header->addr_size;
12880 return set_die_type (die, type, cu);
12883 static struct type *
12884 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12886 struct type *base_type, *cv_type;
12888 base_type = die_type (die, cu);
12890 /* The die_type call above may have already set the type for this DIE. */
12891 cv_type = get_die_type (die, cu);
12895 /* In case the const qualifier is applied to an array type, the element type
12896 is so qualified, not the array type (section 6.7.3 of C99). */
12897 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12899 struct type *el_type, *inner_array;
12901 base_type = copy_type (base_type);
12902 inner_array = base_type;
12904 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12906 TYPE_TARGET_TYPE (inner_array) =
12907 copy_type (TYPE_TARGET_TYPE (inner_array));
12908 inner_array = TYPE_TARGET_TYPE (inner_array);
12911 el_type = TYPE_TARGET_TYPE (inner_array);
12912 TYPE_TARGET_TYPE (inner_array) =
12913 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12915 return set_die_type (die, base_type, cu);
12918 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12919 return set_die_type (die, cv_type, cu);
12922 static struct type *
12923 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12925 struct type *base_type, *cv_type;
12927 base_type = die_type (die, cu);
12929 /* The die_type call above may have already set the type for this DIE. */
12930 cv_type = get_die_type (die, cu);
12934 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12935 return set_die_type (die, cv_type, cu);
12938 /* Handle DW_TAG_restrict_type. */
12940 static struct type *
12941 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12943 struct type *base_type, *cv_type;
12945 base_type = die_type (die, cu);
12947 /* The die_type call above may have already set the type for this DIE. */
12948 cv_type = get_die_type (die, cu);
12952 cv_type = make_restrict_type (base_type);
12953 return set_die_type (die, cv_type, cu);
12956 /* Extract all information from a DW_TAG_string_type DIE and add to
12957 the user defined type vector. It isn't really a user defined type,
12958 but it behaves like one, with other DIE's using an AT_user_def_type
12959 attribute to reference it. */
12961 static struct type *
12962 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12964 struct objfile *objfile = cu->objfile;
12965 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12966 struct type *type, *range_type, *index_type, *char_type;
12967 struct attribute *attr;
12968 unsigned int length;
12970 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12973 length = DW_UNSND (attr);
12977 /* Check for the DW_AT_byte_size attribute. */
12978 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12981 length = DW_UNSND (attr);
12989 index_type = objfile_type (objfile)->builtin_int;
12990 range_type = create_range_type (NULL, index_type, 1, length);
12991 char_type = language_string_char_type (cu->language_defn, gdbarch);
12992 type = create_string_type (NULL, char_type, range_type);
12994 return set_die_type (die, type, cu);
12997 /* Assuming that DIE corresponds to a function, returns nonzero
12998 if the function is prototyped. */
13001 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
13003 struct attribute *attr;
13005 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
13006 if (attr && (DW_UNSND (attr) != 0))
13009 /* The DWARF standard implies that the DW_AT_prototyped attribute
13010 is only meaninful for C, but the concept also extends to other
13011 languages that allow unprototyped functions (Eg: Objective C).
13012 For all other languages, assume that functions are always
13014 if (cu->language != language_c
13015 && cu->language != language_objc
13016 && cu->language != language_opencl)
13019 /* RealView does not emit DW_AT_prototyped. We can not distinguish
13020 prototyped and unprototyped functions; default to prototyped,
13021 since that is more common in modern code (and RealView warns
13022 about unprototyped functions). */
13023 if (producer_is_realview (cu->producer))
13029 /* Handle DIES due to C code like:
13033 int (*funcp)(int a, long l);
13037 ('funcp' generates a DW_TAG_subroutine_type DIE). */
13039 static struct type *
13040 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
13042 struct objfile *objfile = cu->objfile;
13043 struct type *type; /* Type that this function returns. */
13044 struct type *ftype; /* Function that returns above type. */
13045 struct attribute *attr;
13047 type = die_type (die, cu);
13049 /* The die_type call above may have already set the type for this DIE. */
13050 ftype = get_die_type (die, cu);
13054 ftype = lookup_function_type (type);
13056 if (prototyped_function_p (die, cu))
13057 TYPE_PROTOTYPED (ftype) = 1;
13059 /* Store the calling convention in the type if it's available in
13060 the subroutine die. Otherwise set the calling convention to
13061 the default value DW_CC_normal. */
13062 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
13064 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
13065 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
13066 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
13068 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
13070 /* We need to add the subroutine type to the die immediately so
13071 we don't infinitely recurse when dealing with parameters
13072 declared as the same subroutine type. */
13073 set_die_type (die, ftype, cu);
13075 if (die->child != NULL)
13077 struct type *void_type = objfile_type (objfile)->builtin_void;
13078 struct die_info *child_die;
13079 int nparams, iparams;
13081 /* Count the number of parameters.
13082 FIXME: GDB currently ignores vararg functions, but knows about
13083 vararg member functions. */
13085 child_die = die->child;
13086 while (child_die && child_die->tag)
13088 if (child_die->tag == DW_TAG_formal_parameter)
13090 else if (child_die->tag == DW_TAG_unspecified_parameters)
13091 TYPE_VARARGS (ftype) = 1;
13092 child_die = sibling_die (child_die);
13095 /* Allocate storage for parameters and fill them in. */
13096 TYPE_NFIELDS (ftype) = nparams;
13097 TYPE_FIELDS (ftype) = (struct field *)
13098 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
13100 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
13101 even if we error out during the parameters reading below. */
13102 for (iparams = 0; iparams < nparams; iparams++)
13103 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
13106 child_die = die->child;
13107 while (child_die && child_die->tag)
13109 if (child_die->tag == DW_TAG_formal_parameter)
13111 struct type *arg_type;
13113 /* DWARF version 2 has no clean way to discern C++
13114 static and non-static member functions. G++ helps
13115 GDB by marking the first parameter for non-static
13116 member functions (which is the this pointer) as
13117 artificial. We pass this information to
13118 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
13120 DWARF version 3 added DW_AT_object_pointer, which GCC
13121 4.5 does not yet generate. */
13122 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
13124 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
13127 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
13129 /* GCC/43521: In java, the formal parameter
13130 "this" is sometimes not marked with DW_AT_artificial. */
13131 if (cu->language == language_java)
13133 const char *name = dwarf2_name (child_die, cu);
13135 if (name && !strcmp (name, "this"))
13136 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
13139 arg_type = die_type (child_die, cu);
13141 /* RealView does not mark THIS as const, which the testsuite
13142 expects. GCC marks THIS as const in method definitions,
13143 but not in the class specifications (GCC PR 43053). */
13144 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
13145 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
13148 struct dwarf2_cu *arg_cu = cu;
13149 const char *name = dwarf2_name (child_die, cu);
13151 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
13154 /* If the compiler emits this, use it. */
13155 if (follow_die_ref (die, attr, &arg_cu) == child_die)
13158 else if (name && strcmp (name, "this") == 0)
13159 /* Function definitions will have the argument names. */
13161 else if (name == NULL && iparams == 0)
13162 /* Declarations may not have the names, so like
13163 elsewhere in GDB, assume an artificial first
13164 argument is "this". */
13168 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
13172 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
13175 child_die = sibling_die (child_die);
13182 static struct type *
13183 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
13185 struct objfile *objfile = cu->objfile;
13186 const char *name = NULL;
13187 struct type *this_type, *target_type;
13189 name = dwarf2_full_name (NULL, die, cu);
13190 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
13191 TYPE_FLAG_TARGET_STUB, NULL, objfile);
13192 TYPE_NAME (this_type) = name;
13193 set_die_type (die, this_type, cu);
13194 target_type = die_type (die, cu);
13195 if (target_type != this_type)
13196 TYPE_TARGET_TYPE (this_type) = target_type;
13199 /* Self-referential typedefs are, it seems, not allowed by the DWARF
13200 spec and cause infinite loops in GDB. */
13201 complaint (&symfile_complaints,
13202 _("Self-referential DW_TAG_typedef "
13203 "- DIE at 0x%x [in module %s]"),
13204 die->offset.sect_off, objfile->name);
13205 TYPE_TARGET_TYPE (this_type) = NULL;
13210 /* Find a representation of a given base type and install
13211 it in the TYPE field of the die. */
13213 static struct type *
13214 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
13216 struct objfile *objfile = cu->objfile;
13218 struct attribute *attr;
13219 int encoding = 0, size = 0;
13221 enum type_code code = TYPE_CODE_INT;
13222 int type_flags = 0;
13223 struct type *target_type = NULL;
13225 attr = dwarf2_attr (die, DW_AT_encoding, cu);
13228 encoding = DW_UNSND (attr);
13230 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13233 size = DW_UNSND (attr);
13235 name = dwarf2_name (die, cu);
13238 complaint (&symfile_complaints,
13239 _("DW_AT_name missing from DW_TAG_base_type"));
13244 case DW_ATE_address:
13245 /* Turn DW_ATE_address into a void * pointer. */
13246 code = TYPE_CODE_PTR;
13247 type_flags |= TYPE_FLAG_UNSIGNED;
13248 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
13250 case DW_ATE_boolean:
13251 code = TYPE_CODE_BOOL;
13252 type_flags |= TYPE_FLAG_UNSIGNED;
13254 case DW_ATE_complex_float:
13255 code = TYPE_CODE_COMPLEX;
13256 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
13258 case DW_ATE_decimal_float:
13259 code = TYPE_CODE_DECFLOAT;
13262 code = TYPE_CODE_FLT;
13264 case DW_ATE_signed:
13266 case DW_ATE_unsigned:
13267 type_flags |= TYPE_FLAG_UNSIGNED;
13268 if (cu->language == language_fortran
13270 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
13271 code = TYPE_CODE_CHAR;
13273 case DW_ATE_signed_char:
13274 if (cu->language == language_ada || cu->language == language_m2
13275 || cu->language == language_pascal
13276 || cu->language == language_fortran)
13277 code = TYPE_CODE_CHAR;
13279 case DW_ATE_unsigned_char:
13280 if (cu->language == language_ada || cu->language == language_m2
13281 || cu->language == language_pascal
13282 || cu->language == language_fortran)
13283 code = TYPE_CODE_CHAR;
13284 type_flags |= TYPE_FLAG_UNSIGNED;
13287 /* We just treat this as an integer and then recognize the
13288 type by name elsewhere. */
13292 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
13293 dwarf_type_encoding_name (encoding));
13297 type = init_type (code, size, type_flags, NULL, objfile);
13298 TYPE_NAME (type) = name;
13299 TYPE_TARGET_TYPE (type) = target_type;
13301 if (name && strcmp (name, "char") == 0)
13302 TYPE_NOSIGN (type) = 1;
13304 return set_die_type (die, type, cu);
13307 /* Read the given DW_AT_subrange DIE. */
13309 static struct type *
13310 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
13312 struct type *base_type, *orig_base_type;
13313 struct type *range_type;
13314 struct attribute *attr;
13316 int low_default_is_valid;
13318 LONGEST negative_mask;
13320 orig_base_type = die_type (die, cu);
13321 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
13322 whereas the real type might be. So, we use ORIG_BASE_TYPE when
13323 creating the range type, but we use the result of check_typedef
13324 when examining properties of the type. */
13325 base_type = check_typedef (orig_base_type);
13327 /* The die_type call above may have already set the type for this DIE. */
13328 range_type = get_die_type (die, cu);
13332 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
13333 omitting DW_AT_lower_bound. */
13334 switch (cu->language)
13337 case language_cplus:
13339 low_default_is_valid = 1;
13341 case language_fortran:
13343 low_default_is_valid = 1;
13346 case language_java:
13347 case language_objc:
13349 low_default_is_valid = (cu->header.version >= 4);
13353 case language_pascal:
13355 low_default_is_valid = (cu->header.version >= 4);
13359 low_default_is_valid = 0;
13363 /* FIXME: For variable sized arrays either of these could be
13364 a variable rather than a constant value. We'll allow it,
13365 but we don't know how to handle it. */
13366 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
13368 low = dwarf2_get_attr_constant_value (attr, low);
13369 else if (!low_default_is_valid)
13370 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
13371 "- DIE at 0x%x [in module %s]"),
13372 die->offset.sect_off, cu->objfile->name);
13374 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
13377 if (attr_form_is_block (attr) || is_ref_attr (attr))
13379 /* GCC encodes arrays with unspecified or dynamic length
13380 with a DW_FORM_block1 attribute or a reference attribute.
13381 FIXME: GDB does not yet know how to handle dynamic
13382 arrays properly, treat them as arrays with unspecified
13385 FIXME: jimb/2003-09-22: GDB does not really know
13386 how to handle arrays of unspecified length
13387 either; we just represent them as zero-length
13388 arrays. Choose an appropriate upper bound given
13389 the lower bound we've computed above. */
13393 high = dwarf2_get_attr_constant_value (attr, 1);
13397 attr = dwarf2_attr (die, DW_AT_count, cu);
13400 int count = dwarf2_get_attr_constant_value (attr, 1);
13401 high = low + count - 1;
13405 /* Unspecified array length. */
13410 /* Dwarf-2 specifications explicitly allows to create subrange types
13411 without specifying a base type.
13412 In that case, the base type must be set to the type of
13413 the lower bound, upper bound or count, in that order, if any of these
13414 three attributes references an object that has a type.
13415 If no base type is found, the Dwarf-2 specifications say that
13416 a signed integer type of size equal to the size of an address should
13418 For the following C code: `extern char gdb_int [];'
13419 GCC produces an empty range DIE.
13420 FIXME: muller/2010-05-28: Possible references to object for low bound,
13421 high bound or count are not yet handled by this code. */
13422 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
13424 struct objfile *objfile = cu->objfile;
13425 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13426 int addr_size = gdbarch_addr_bit (gdbarch) /8;
13427 struct type *int_type = objfile_type (objfile)->builtin_int;
13429 /* Test "int", "long int", and "long long int" objfile types,
13430 and select the first one having a size above or equal to the
13431 architecture address size. */
13432 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13433 base_type = int_type;
13436 int_type = objfile_type (objfile)->builtin_long;
13437 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13438 base_type = int_type;
13441 int_type = objfile_type (objfile)->builtin_long_long;
13442 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13443 base_type = int_type;
13449 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13450 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13451 low |= negative_mask;
13452 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13453 high |= negative_mask;
13455 range_type = create_range_type (NULL, orig_base_type, low, high);
13457 /* Mark arrays with dynamic length at least as an array of unspecified
13458 length. GDB could check the boundary but before it gets implemented at
13459 least allow accessing the array elements. */
13460 if (attr && attr_form_is_block (attr))
13461 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13463 /* Ada expects an empty array on no boundary attributes. */
13464 if (attr == NULL && cu->language != language_ada)
13465 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13467 name = dwarf2_name (die, cu);
13469 TYPE_NAME (range_type) = name;
13471 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13473 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13475 set_die_type (die, range_type, cu);
13477 /* set_die_type should be already done. */
13478 set_descriptive_type (range_type, die, cu);
13483 static struct type *
13484 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13488 /* For now, we only support the C meaning of an unspecified type: void. */
13490 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13491 TYPE_NAME (type) = dwarf2_name (die, cu);
13493 return set_die_type (die, type, cu);
13496 /* Read a single die and all its descendents. Set the die's sibling
13497 field to NULL; set other fields in the die correctly, and set all
13498 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13499 location of the info_ptr after reading all of those dies. PARENT
13500 is the parent of the die in question. */
13502 static struct die_info *
13503 read_die_and_children (const struct die_reader_specs *reader,
13504 const gdb_byte *info_ptr,
13505 const gdb_byte **new_info_ptr,
13506 struct die_info *parent)
13508 struct die_info *die;
13509 const gdb_byte *cur_ptr;
13512 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13515 *new_info_ptr = cur_ptr;
13518 store_in_ref_table (die, reader->cu);
13521 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13525 *new_info_ptr = cur_ptr;
13528 die->sibling = NULL;
13529 die->parent = parent;
13533 /* Read a die, all of its descendents, and all of its siblings; set
13534 all of the fields of all of the dies correctly. Arguments are as
13535 in read_die_and_children. */
13537 static struct die_info *
13538 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13539 const gdb_byte *info_ptr,
13540 const gdb_byte **new_info_ptr,
13541 struct die_info *parent)
13543 struct die_info *first_die, *last_sibling;
13544 const gdb_byte *cur_ptr;
13546 cur_ptr = info_ptr;
13547 first_die = last_sibling = NULL;
13551 struct die_info *die
13552 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13556 *new_info_ptr = cur_ptr;
13563 last_sibling->sibling = die;
13565 last_sibling = die;
13569 /* Read a die, all of its descendents, and all of its siblings; set
13570 all of the fields of all of the dies correctly. Arguments are as
13571 in read_die_and_children.
13572 This the main entry point for reading a DIE and all its children. */
13574 static struct die_info *
13575 read_die_and_siblings (const struct die_reader_specs *reader,
13576 const gdb_byte *info_ptr,
13577 const gdb_byte **new_info_ptr,
13578 struct die_info *parent)
13580 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13581 new_info_ptr, parent);
13583 if (dwarf2_die_debug)
13585 fprintf_unfiltered (gdb_stdlog,
13586 "Read die from %s@0x%x of %s:\n",
13587 bfd_section_name (reader->abfd,
13588 reader->die_section->asection),
13589 (unsigned) (info_ptr - reader->die_section->buffer),
13590 bfd_get_filename (reader->abfd));
13591 dump_die (die, dwarf2_die_debug);
13597 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13599 The caller is responsible for filling in the extra attributes
13600 and updating (*DIEP)->num_attrs.
13601 Set DIEP to point to a newly allocated die with its information,
13602 except for its child, sibling, and parent fields.
13603 Set HAS_CHILDREN to tell whether the die has children or not. */
13605 static const gdb_byte *
13606 read_full_die_1 (const struct die_reader_specs *reader,
13607 struct die_info **diep, const gdb_byte *info_ptr,
13608 int *has_children, int num_extra_attrs)
13610 unsigned int abbrev_number, bytes_read, i;
13611 sect_offset offset;
13612 struct abbrev_info *abbrev;
13613 struct die_info *die;
13614 struct dwarf2_cu *cu = reader->cu;
13615 bfd *abfd = reader->abfd;
13617 offset.sect_off = info_ptr - reader->buffer;
13618 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13619 info_ptr += bytes_read;
13620 if (!abbrev_number)
13627 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13629 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13631 bfd_get_filename (abfd));
13633 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13634 die->offset = offset;
13635 die->tag = abbrev->tag;
13636 die->abbrev = abbrev_number;
13638 /* Make the result usable.
13639 The caller needs to update num_attrs after adding the extra
13641 die->num_attrs = abbrev->num_attrs;
13643 for (i = 0; i < abbrev->num_attrs; ++i)
13644 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13648 *has_children = abbrev->has_children;
13652 /* Read a die and all its attributes.
13653 Set DIEP to point to a newly allocated die with its information,
13654 except for its child, sibling, and parent fields.
13655 Set HAS_CHILDREN to tell whether the die has children or not. */
13657 static const gdb_byte *
13658 read_full_die (const struct die_reader_specs *reader,
13659 struct die_info **diep, const gdb_byte *info_ptr,
13662 const gdb_byte *result;
13664 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13666 if (dwarf2_die_debug)
13668 fprintf_unfiltered (gdb_stdlog,
13669 "Read die from %s@0x%x of %s:\n",
13670 bfd_section_name (reader->abfd,
13671 reader->die_section->asection),
13672 (unsigned) (info_ptr - reader->die_section->buffer),
13673 bfd_get_filename (reader->abfd));
13674 dump_die (*diep, dwarf2_die_debug);
13680 /* Abbreviation tables.
13682 In DWARF version 2, the description of the debugging information is
13683 stored in a separate .debug_abbrev section. Before we read any
13684 dies from a section we read in all abbreviations and install them
13685 in a hash table. */
13687 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13689 static struct abbrev_info *
13690 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13692 struct abbrev_info *abbrev;
13694 abbrev = (struct abbrev_info *)
13695 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13696 memset (abbrev, 0, sizeof (struct abbrev_info));
13700 /* Add an abbreviation to the table. */
13703 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13704 unsigned int abbrev_number,
13705 struct abbrev_info *abbrev)
13707 unsigned int hash_number;
13709 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13710 abbrev->next = abbrev_table->abbrevs[hash_number];
13711 abbrev_table->abbrevs[hash_number] = abbrev;
13714 /* Look up an abbrev in the table.
13715 Returns NULL if the abbrev is not found. */
13717 static struct abbrev_info *
13718 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13719 unsigned int abbrev_number)
13721 unsigned int hash_number;
13722 struct abbrev_info *abbrev;
13724 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13725 abbrev = abbrev_table->abbrevs[hash_number];
13729 if (abbrev->number == abbrev_number)
13731 abbrev = abbrev->next;
13736 /* Read in an abbrev table. */
13738 static struct abbrev_table *
13739 abbrev_table_read_table (struct dwarf2_section_info *section,
13740 sect_offset offset)
13742 struct objfile *objfile = dwarf2_per_objfile->objfile;
13743 bfd *abfd = section->asection->owner;
13744 struct abbrev_table *abbrev_table;
13745 const gdb_byte *abbrev_ptr;
13746 struct abbrev_info *cur_abbrev;
13747 unsigned int abbrev_number, bytes_read, abbrev_name;
13748 unsigned int abbrev_form;
13749 struct attr_abbrev *cur_attrs;
13750 unsigned int allocated_attrs;
13752 abbrev_table = XMALLOC (struct abbrev_table);
13753 abbrev_table->offset = offset;
13754 obstack_init (&abbrev_table->abbrev_obstack);
13755 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13757 * sizeof (struct abbrev_info *)));
13758 memset (abbrev_table->abbrevs, 0,
13759 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13761 dwarf2_read_section (objfile, section);
13762 abbrev_ptr = section->buffer + offset.sect_off;
13763 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13764 abbrev_ptr += bytes_read;
13766 allocated_attrs = ATTR_ALLOC_CHUNK;
13767 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13769 /* Loop until we reach an abbrev number of 0. */
13770 while (abbrev_number)
13772 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13774 /* read in abbrev header */
13775 cur_abbrev->number = abbrev_number;
13776 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13777 abbrev_ptr += bytes_read;
13778 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13781 /* now read in declarations */
13782 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13783 abbrev_ptr += bytes_read;
13784 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13785 abbrev_ptr += bytes_read;
13786 while (abbrev_name)
13788 if (cur_abbrev->num_attrs == allocated_attrs)
13790 allocated_attrs += ATTR_ALLOC_CHUNK;
13792 = xrealloc (cur_attrs, (allocated_attrs
13793 * sizeof (struct attr_abbrev)));
13796 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13797 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13798 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13799 abbrev_ptr += bytes_read;
13800 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13801 abbrev_ptr += bytes_read;
13804 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13805 (cur_abbrev->num_attrs
13806 * sizeof (struct attr_abbrev)));
13807 memcpy (cur_abbrev->attrs, cur_attrs,
13808 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13810 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13812 /* Get next abbreviation.
13813 Under Irix6 the abbreviations for a compilation unit are not
13814 always properly terminated with an abbrev number of 0.
13815 Exit loop if we encounter an abbreviation which we have
13816 already read (which means we are about to read the abbreviations
13817 for the next compile unit) or if the end of the abbreviation
13818 table is reached. */
13819 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13821 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13822 abbrev_ptr += bytes_read;
13823 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13828 return abbrev_table;
13831 /* Free the resources held by ABBREV_TABLE. */
13834 abbrev_table_free (struct abbrev_table *abbrev_table)
13836 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13837 xfree (abbrev_table);
13840 /* Same as abbrev_table_free but as a cleanup.
13841 We pass in a pointer to the pointer to the table so that we can
13842 set the pointer to NULL when we're done. It also simplifies
13843 build_type_unit_groups. */
13846 abbrev_table_free_cleanup (void *table_ptr)
13848 struct abbrev_table **abbrev_table_ptr = table_ptr;
13850 if (*abbrev_table_ptr != NULL)
13851 abbrev_table_free (*abbrev_table_ptr);
13852 *abbrev_table_ptr = NULL;
13855 /* Read the abbrev table for CU from ABBREV_SECTION. */
13858 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13859 struct dwarf2_section_info *abbrev_section)
13862 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13865 /* Release the memory used by the abbrev table for a compilation unit. */
13868 dwarf2_free_abbrev_table (void *ptr_to_cu)
13870 struct dwarf2_cu *cu = ptr_to_cu;
13872 if (cu->abbrev_table != NULL)
13873 abbrev_table_free (cu->abbrev_table);
13874 /* Set this to NULL so that we SEGV if we try to read it later,
13875 and also because free_comp_unit verifies this is NULL. */
13876 cu->abbrev_table = NULL;
13879 /* Returns nonzero if TAG represents a type that we might generate a partial
13883 is_type_tag_for_partial (int tag)
13888 /* Some types that would be reasonable to generate partial symbols for,
13889 that we don't at present. */
13890 case DW_TAG_array_type:
13891 case DW_TAG_file_type:
13892 case DW_TAG_ptr_to_member_type:
13893 case DW_TAG_set_type:
13894 case DW_TAG_string_type:
13895 case DW_TAG_subroutine_type:
13897 case DW_TAG_base_type:
13898 case DW_TAG_class_type:
13899 case DW_TAG_interface_type:
13900 case DW_TAG_enumeration_type:
13901 case DW_TAG_structure_type:
13902 case DW_TAG_subrange_type:
13903 case DW_TAG_typedef:
13904 case DW_TAG_union_type:
13911 /* Load all DIEs that are interesting for partial symbols into memory. */
13913 static struct partial_die_info *
13914 load_partial_dies (const struct die_reader_specs *reader,
13915 const gdb_byte *info_ptr, int building_psymtab)
13917 struct dwarf2_cu *cu = reader->cu;
13918 struct objfile *objfile = cu->objfile;
13919 struct partial_die_info *part_die;
13920 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13921 struct abbrev_info *abbrev;
13922 unsigned int bytes_read;
13923 unsigned int load_all = 0;
13924 int nesting_level = 1;
13929 gdb_assert (cu->per_cu != NULL);
13930 if (cu->per_cu->load_all_dies)
13934 = htab_create_alloc_ex (cu->header.length / 12,
13938 &cu->comp_unit_obstack,
13939 hashtab_obstack_allocate,
13940 dummy_obstack_deallocate);
13942 part_die = obstack_alloc (&cu->comp_unit_obstack,
13943 sizeof (struct partial_die_info));
13947 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13949 /* A NULL abbrev means the end of a series of children. */
13950 if (abbrev == NULL)
13952 if (--nesting_level == 0)
13954 /* PART_DIE was probably the last thing allocated on the
13955 comp_unit_obstack, so we could call obstack_free
13956 here. We don't do that because the waste is small,
13957 and will be cleaned up when we're done with this
13958 compilation unit. This way, we're also more robust
13959 against other users of the comp_unit_obstack. */
13962 info_ptr += bytes_read;
13963 last_die = parent_die;
13964 parent_die = parent_die->die_parent;
13968 /* Check for template arguments. We never save these; if
13969 they're seen, we just mark the parent, and go on our way. */
13970 if (parent_die != NULL
13971 && cu->language == language_cplus
13972 && (abbrev->tag == DW_TAG_template_type_param
13973 || abbrev->tag == DW_TAG_template_value_param))
13975 parent_die->has_template_arguments = 1;
13979 /* We don't need a partial DIE for the template argument. */
13980 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13985 /* We only recurse into c++ subprograms looking for template arguments.
13986 Skip their other children. */
13988 && cu->language == language_cplus
13989 && parent_die != NULL
13990 && parent_die->tag == DW_TAG_subprogram)
13992 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13996 /* Check whether this DIE is interesting enough to save. Normally
13997 we would not be interested in members here, but there may be
13998 later variables referencing them via DW_AT_specification (for
13999 static members). */
14001 && !is_type_tag_for_partial (abbrev->tag)
14002 && abbrev->tag != DW_TAG_constant
14003 && abbrev->tag != DW_TAG_enumerator
14004 && abbrev->tag != DW_TAG_subprogram
14005 && abbrev->tag != DW_TAG_lexical_block
14006 && abbrev->tag != DW_TAG_variable
14007 && abbrev->tag != DW_TAG_namespace
14008 && abbrev->tag != DW_TAG_module
14009 && abbrev->tag != DW_TAG_member
14010 && abbrev->tag != DW_TAG_imported_unit)
14012 /* Otherwise we skip to the next sibling, if any. */
14013 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14017 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
14020 /* This two-pass algorithm for processing partial symbols has a
14021 high cost in cache pressure. Thus, handle some simple cases
14022 here which cover the majority of C partial symbols. DIEs
14023 which neither have specification tags in them, nor could have
14024 specification tags elsewhere pointing at them, can simply be
14025 processed and discarded.
14027 This segment is also optional; scan_partial_symbols and
14028 add_partial_symbol will handle these DIEs if we chain
14029 them in normally. When compilers which do not emit large
14030 quantities of duplicate debug information are more common,
14031 this code can probably be removed. */
14033 /* Any complete simple types at the top level (pretty much all
14034 of them, for a language without namespaces), can be processed
14036 if (parent_die == NULL
14037 && part_die->has_specification == 0
14038 && part_die->is_declaration == 0
14039 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
14040 || part_die->tag == DW_TAG_base_type
14041 || part_die->tag == DW_TAG_subrange_type))
14043 if (building_psymtab && part_die->name != NULL)
14044 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14045 VAR_DOMAIN, LOC_TYPEDEF,
14046 &objfile->static_psymbols,
14047 0, (CORE_ADDR) 0, cu->language, objfile);
14048 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14052 /* The exception for DW_TAG_typedef with has_children above is
14053 a workaround of GCC PR debug/47510. In the case of this complaint
14054 type_name_no_tag_or_error will error on such types later.
14056 GDB skipped children of DW_TAG_typedef by the shortcut above and then
14057 it could not find the child DIEs referenced later, this is checked
14058 above. In correct DWARF DW_TAG_typedef should have no children. */
14060 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
14061 complaint (&symfile_complaints,
14062 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
14063 "- DIE at 0x%x [in module %s]"),
14064 part_die->offset.sect_off, objfile->name);
14066 /* If we're at the second level, and we're an enumerator, and
14067 our parent has no specification (meaning possibly lives in a
14068 namespace elsewhere), then we can add the partial symbol now
14069 instead of queueing it. */
14070 if (part_die->tag == DW_TAG_enumerator
14071 && parent_die != NULL
14072 && parent_die->die_parent == NULL
14073 && parent_die->tag == DW_TAG_enumeration_type
14074 && parent_die->has_specification == 0)
14076 if (part_die->name == NULL)
14077 complaint (&symfile_complaints,
14078 _("malformed enumerator DIE ignored"));
14079 else if (building_psymtab)
14080 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14081 VAR_DOMAIN, LOC_CONST,
14082 (cu->language == language_cplus
14083 || cu->language == language_java)
14084 ? &objfile->global_psymbols
14085 : &objfile->static_psymbols,
14086 0, (CORE_ADDR) 0, cu->language, objfile);
14088 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14092 /* We'll save this DIE so link it in. */
14093 part_die->die_parent = parent_die;
14094 part_die->die_sibling = NULL;
14095 part_die->die_child = NULL;
14097 if (last_die && last_die == parent_die)
14098 last_die->die_child = part_die;
14100 last_die->die_sibling = part_die;
14102 last_die = part_die;
14104 if (first_die == NULL)
14105 first_die = part_die;
14107 /* Maybe add the DIE to the hash table. Not all DIEs that we
14108 find interesting need to be in the hash table, because we
14109 also have the parent/sibling/child chains; only those that we
14110 might refer to by offset later during partial symbol reading.
14112 For now this means things that might have be the target of a
14113 DW_AT_specification, DW_AT_abstract_origin, or
14114 DW_AT_extension. DW_AT_extension will refer only to
14115 namespaces; DW_AT_abstract_origin refers to functions (and
14116 many things under the function DIE, but we do not recurse
14117 into function DIEs during partial symbol reading) and
14118 possibly variables as well; DW_AT_specification refers to
14119 declarations. Declarations ought to have the DW_AT_declaration
14120 flag. It happens that GCC forgets to put it in sometimes, but
14121 only for functions, not for types.
14123 Adding more things than necessary to the hash table is harmless
14124 except for the performance cost. Adding too few will result in
14125 wasted time in find_partial_die, when we reread the compilation
14126 unit with load_all_dies set. */
14129 || abbrev->tag == DW_TAG_constant
14130 || abbrev->tag == DW_TAG_subprogram
14131 || abbrev->tag == DW_TAG_variable
14132 || abbrev->tag == DW_TAG_namespace
14133 || part_die->is_declaration)
14137 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
14138 part_die->offset.sect_off, INSERT);
14142 part_die = obstack_alloc (&cu->comp_unit_obstack,
14143 sizeof (struct partial_die_info));
14145 /* For some DIEs we want to follow their children (if any). For C
14146 we have no reason to follow the children of structures; for other
14147 languages we have to, so that we can get at method physnames
14148 to infer fully qualified class names, for DW_AT_specification,
14149 and for C++ template arguments. For C++, we also look one level
14150 inside functions to find template arguments (if the name of the
14151 function does not already contain the template arguments).
14153 For Ada, we need to scan the children of subprograms and lexical
14154 blocks as well because Ada allows the definition of nested
14155 entities that could be interesting for the debugger, such as
14156 nested subprograms for instance. */
14157 if (last_die->has_children
14159 || last_die->tag == DW_TAG_namespace
14160 || last_die->tag == DW_TAG_module
14161 || last_die->tag == DW_TAG_enumeration_type
14162 || (cu->language == language_cplus
14163 && last_die->tag == DW_TAG_subprogram
14164 && (last_die->name == NULL
14165 || strchr (last_die->name, '<') == NULL))
14166 || (cu->language != language_c
14167 && (last_die->tag == DW_TAG_class_type
14168 || last_die->tag == DW_TAG_interface_type
14169 || last_die->tag == DW_TAG_structure_type
14170 || last_die->tag == DW_TAG_union_type))
14171 || (cu->language == language_ada
14172 && (last_die->tag == DW_TAG_subprogram
14173 || last_die->tag == DW_TAG_lexical_block))))
14176 parent_die = last_die;
14180 /* Otherwise we skip to the next sibling, if any. */
14181 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
14183 /* Back to the top, do it again. */
14187 /* Read a minimal amount of information into the minimal die structure. */
14189 static const gdb_byte *
14190 read_partial_die (const struct die_reader_specs *reader,
14191 struct partial_die_info *part_die,
14192 struct abbrev_info *abbrev, unsigned int abbrev_len,
14193 const gdb_byte *info_ptr)
14195 struct dwarf2_cu *cu = reader->cu;
14196 struct objfile *objfile = cu->objfile;
14197 const gdb_byte *buffer = reader->buffer;
14199 struct attribute attr;
14200 int has_low_pc_attr = 0;
14201 int has_high_pc_attr = 0;
14202 int high_pc_relative = 0;
14204 memset (part_die, 0, sizeof (struct partial_die_info));
14206 part_die->offset.sect_off = info_ptr - buffer;
14208 info_ptr += abbrev_len;
14210 if (abbrev == NULL)
14213 part_die->tag = abbrev->tag;
14214 part_die->has_children = abbrev->has_children;
14216 for (i = 0; i < abbrev->num_attrs; ++i)
14218 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
14220 /* Store the data if it is of an attribute we want to keep in a
14221 partial symbol table. */
14225 switch (part_die->tag)
14227 case DW_TAG_compile_unit:
14228 case DW_TAG_partial_unit:
14229 case DW_TAG_type_unit:
14230 /* Compilation units have a DW_AT_name that is a filename, not
14231 a source language identifier. */
14232 case DW_TAG_enumeration_type:
14233 case DW_TAG_enumerator:
14234 /* These tags always have simple identifiers already; no need
14235 to canonicalize them. */
14236 part_die->name = DW_STRING (&attr);
14240 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
14241 &objfile->objfile_obstack);
14245 case DW_AT_linkage_name:
14246 case DW_AT_MIPS_linkage_name:
14247 /* Note that both forms of linkage name might appear. We
14248 assume they will be the same, and we only store the last
14250 if (cu->language == language_ada)
14251 part_die->name = DW_STRING (&attr);
14252 part_die->linkage_name = DW_STRING (&attr);
14255 has_low_pc_attr = 1;
14256 part_die->lowpc = DW_ADDR (&attr);
14258 case DW_AT_high_pc:
14259 has_high_pc_attr = 1;
14260 if (attr.form == DW_FORM_addr
14261 || attr.form == DW_FORM_GNU_addr_index)
14262 part_die->highpc = DW_ADDR (&attr);
14265 high_pc_relative = 1;
14266 part_die->highpc = DW_UNSND (&attr);
14269 case DW_AT_location:
14270 /* Support the .debug_loc offsets. */
14271 if (attr_form_is_block (&attr))
14273 part_die->d.locdesc = DW_BLOCK (&attr);
14275 else if (attr_form_is_section_offset (&attr))
14277 dwarf2_complex_location_expr_complaint ();
14281 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14282 "partial symbol information");
14285 case DW_AT_external:
14286 part_die->is_external = DW_UNSND (&attr);
14288 case DW_AT_declaration:
14289 part_die->is_declaration = DW_UNSND (&attr);
14292 part_die->has_type = 1;
14294 case DW_AT_abstract_origin:
14295 case DW_AT_specification:
14296 case DW_AT_extension:
14297 part_die->has_specification = 1;
14298 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
14299 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14300 || cu->per_cu->is_dwz);
14302 case DW_AT_sibling:
14303 /* Ignore absolute siblings, they might point outside of
14304 the current compile unit. */
14305 if (attr.form == DW_FORM_ref_addr)
14306 complaint (&symfile_complaints,
14307 _("ignoring absolute DW_AT_sibling"));
14309 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
14311 case DW_AT_byte_size:
14312 part_die->has_byte_size = 1;
14314 case DW_AT_calling_convention:
14315 /* DWARF doesn't provide a way to identify a program's source-level
14316 entry point. DW_AT_calling_convention attributes are only meant
14317 to describe functions' calling conventions.
14319 However, because it's a necessary piece of information in
14320 Fortran, and because DW_CC_program is the only piece of debugging
14321 information whose definition refers to a 'main program' at all,
14322 several compilers have begun marking Fortran main programs with
14323 DW_CC_program --- even when those functions use the standard
14324 calling conventions.
14326 So until DWARF specifies a way to provide this information and
14327 compilers pick up the new representation, we'll support this
14329 if (DW_UNSND (&attr) == DW_CC_program
14330 && cu->language == language_fortran)
14332 set_main_name (part_die->name);
14334 /* As this DIE has a static linkage the name would be difficult
14335 to look up later. */
14336 language_of_main = language_fortran;
14340 if (DW_UNSND (&attr) == DW_INL_inlined
14341 || DW_UNSND (&attr) == DW_INL_declared_inlined)
14342 part_die->may_be_inlined = 1;
14346 if (part_die->tag == DW_TAG_imported_unit)
14348 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
14349 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14350 || cu->per_cu->is_dwz);
14359 if (high_pc_relative)
14360 part_die->highpc += part_die->lowpc;
14362 if (has_low_pc_attr && has_high_pc_attr)
14364 /* When using the GNU linker, .gnu.linkonce. sections are used to
14365 eliminate duplicate copies of functions and vtables and such.
14366 The linker will arbitrarily choose one and discard the others.
14367 The AT_*_pc values for such functions refer to local labels in
14368 these sections. If the section from that file was discarded, the
14369 labels are not in the output, so the relocs get a value of 0.
14370 If this is a discarded function, mark the pc bounds as invalid,
14371 so that GDB will ignore it. */
14372 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
14374 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14376 complaint (&symfile_complaints,
14377 _("DW_AT_low_pc %s is zero "
14378 "for DIE at 0x%x [in module %s]"),
14379 paddress (gdbarch, part_die->lowpc),
14380 part_die->offset.sect_off, objfile->name);
14382 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
14383 else if (part_die->lowpc >= part_die->highpc)
14385 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14387 complaint (&symfile_complaints,
14388 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
14389 "for DIE at 0x%x [in module %s]"),
14390 paddress (gdbarch, part_die->lowpc),
14391 paddress (gdbarch, part_die->highpc),
14392 part_die->offset.sect_off, objfile->name);
14395 part_die->has_pc_info = 1;
14401 /* Find a cached partial DIE at OFFSET in CU. */
14403 static struct partial_die_info *
14404 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
14406 struct partial_die_info *lookup_die = NULL;
14407 struct partial_die_info part_die;
14409 part_die.offset = offset;
14410 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
14416 /* Find a partial DIE at OFFSET, which may or may not be in CU,
14417 except in the case of .debug_types DIEs which do not reference
14418 outside their CU (they do however referencing other types via
14419 DW_FORM_ref_sig8). */
14421 static struct partial_die_info *
14422 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
14424 struct objfile *objfile = cu->objfile;
14425 struct dwarf2_per_cu_data *per_cu = NULL;
14426 struct partial_die_info *pd = NULL;
14428 if (offset_in_dwz == cu->per_cu->is_dwz
14429 && offset_in_cu_p (&cu->header, offset))
14431 pd = find_partial_die_in_comp_unit (offset, cu);
14434 /* We missed recording what we needed.
14435 Load all dies and try again. */
14436 per_cu = cu->per_cu;
14440 /* TUs don't reference other CUs/TUs (except via type signatures). */
14441 if (cu->per_cu->is_debug_types)
14443 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14444 " external reference to offset 0x%lx [in module %s].\n"),
14445 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14446 bfd_get_filename (objfile->obfd));
14448 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14451 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14452 load_partial_comp_unit (per_cu);
14454 per_cu->cu->last_used = 0;
14455 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14458 /* If we didn't find it, and not all dies have been loaded,
14459 load them all and try again. */
14461 if (pd == NULL && per_cu->load_all_dies == 0)
14463 per_cu->load_all_dies = 1;
14465 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14466 THIS_CU->cu may already be in use. So we can't just free it and
14467 replace its DIEs with the ones we read in. Instead, we leave those
14468 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14469 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14471 load_partial_comp_unit (per_cu);
14473 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14477 internal_error (__FILE__, __LINE__,
14478 _("could not find partial DIE 0x%x "
14479 "in cache [from module %s]\n"),
14480 offset.sect_off, bfd_get_filename (objfile->obfd));
14484 /* See if we can figure out if the class lives in a namespace. We do
14485 this by looking for a member function; its demangled name will
14486 contain namespace info, if there is any. */
14489 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14490 struct dwarf2_cu *cu)
14492 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14493 what template types look like, because the demangler
14494 frequently doesn't give the same name as the debug info. We
14495 could fix this by only using the demangled name to get the
14496 prefix (but see comment in read_structure_type). */
14498 struct partial_die_info *real_pdi;
14499 struct partial_die_info *child_pdi;
14501 /* If this DIE (this DIE's specification, if any) has a parent, then
14502 we should not do this. We'll prepend the parent's fully qualified
14503 name when we create the partial symbol. */
14505 real_pdi = struct_pdi;
14506 while (real_pdi->has_specification)
14507 real_pdi = find_partial_die (real_pdi->spec_offset,
14508 real_pdi->spec_is_dwz, cu);
14510 if (real_pdi->die_parent != NULL)
14513 for (child_pdi = struct_pdi->die_child;
14515 child_pdi = child_pdi->die_sibling)
14517 if (child_pdi->tag == DW_TAG_subprogram
14518 && child_pdi->linkage_name != NULL)
14520 char *actual_class_name
14521 = language_class_name_from_physname (cu->language_defn,
14522 child_pdi->linkage_name);
14523 if (actual_class_name != NULL)
14526 = obstack_copy0 (&cu->objfile->objfile_obstack,
14528 strlen (actual_class_name));
14529 xfree (actual_class_name);
14536 /* Adjust PART_DIE before generating a symbol for it. This function
14537 may set the is_external flag or change the DIE's name. */
14540 fixup_partial_die (struct partial_die_info *part_die,
14541 struct dwarf2_cu *cu)
14543 /* Once we've fixed up a die, there's no point in doing so again.
14544 This also avoids a memory leak if we were to call
14545 guess_partial_die_structure_name multiple times. */
14546 if (part_die->fixup_called)
14549 /* If we found a reference attribute and the DIE has no name, try
14550 to find a name in the referred to DIE. */
14552 if (part_die->name == NULL && part_die->has_specification)
14554 struct partial_die_info *spec_die;
14556 spec_die = find_partial_die (part_die->spec_offset,
14557 part_die->spec_is_dwz, cu);
14559 fixup_partial_die (spec_die, cu);
14561 if (spec_die->name)
14563 part_die->name = spec_die->name;
14565 /* Copy DW_AT_external attribute if it is set. */
14566 if (spec_die->is_external)
14567 part_die->is_external = spec_die->is_external;
14571 /* Set default names for some unnamed DIEs. */
14573 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14574 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14576 /* If there is no parent die to provide a namespace, and there are
14577 children, see if we can determine the namespace from their linkage
14579 if (cu->language == language_cplus
14580 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14581 && part_die->die_parent == NULL
14582 && part_die->has_children
14583 && (part_die->tag == DW_TAG_class_type
14584 || part_die->tag == DW_TAG_structure_type
14585 || part_die->tag == DW_TAG_union_type))
14586 guess_partial_die_structure_name (part_die, cu);
14588 /* GCC might emit a nameless struct or union that has a linkage
14589 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14590 if (part_die->name == NULL
14591 && (part_die->tag == DW_TAG_class_type
14592 || part_die->tag == DW_TAG_interface_type
14593 || part_die->tag == DW_TAG_structure_type
14594 || part_die->tag == DW_TAG_union_type)
14595 && part_die->linkage_name != NULL)
14599 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14604 /* Strip any leading namespaces/classes, keep only the base name.
14605 DW_AT_name for named DIEs does not contain the prefixes. */
14606 base = strrchr (demangled, ':');
14607 if (base && base > demangled && base[-1] == ':')
14612 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14613 base, strlen (base));
14618 part_die->fixup_called = 1;
14621 /* Read an attribute value described by an attribute form. */
14623 static const gdb_byte *
14624 read_attribute_value (const struct die_reader_specs *reader,
14625 struct attribute *attr, unsigned form,
14626 const gdb_byte *info_ptr)
14628 struct dwarf2_cu *cu = reader->cu;
14629 bfd *abfd = reader->abfd;
14630 struct comp_unit_head *cu_header = &cu->header;
14631 unsigned int bytes_read;
14632 struct dwarf_block *blk;
14637 case DW_FORM_ref_addr:
14638 if (cu->header.version == 2)
14639 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14641 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14642 &cu->header, &bytes_read);
14643 info_ptr += bytes_read;
14645 case DW_FORM_GNU_ref_alt:
14646 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14647 info_ptr += bytes_read;
14650 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14651 info_ptr += bytes_read;
14653 case DW_FORM_block2:
14654 blk = dwarf_alloc_block (cu);
14655 blk->size = read_2_bytes (abfd, info_ptr);
14657 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14658 info_ptr += blk->size;
14659 DW_BLOCK (attr) = blk;
14661 case DW_FORM_block4:
14662 blk = dwarf_alloc_block (cu);
14663 blk->size = read_4_bytes (abfd, info_ptr);
14665 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14666 info_ptr += blk->size;
14667 DW_BLOCK (attr) = blk;
14669 case DW_FORM_data2:
14670 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14673 case DW_FORM_data4:
14674 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14677 case DW_FORM_data8:
14678 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14681 case DW_FORM_sec_offset:
14682 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14683 info_ptr += bytes_read;
14685 case DW_FORM_string:
14686 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14687 DW_STRING_IS_CANONICAL (attr) = 0;
14688 info_ptr += bytes_read;
14691 if (!cu->per_cu->is_dwz)
14693 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14695 DW_STRING_IS_CANONICAL (attr) = 0;
14696 info_ptr += bytes_read;
14700 case DW_FORM_GNU_strp_alt:
14702 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14703 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14706 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14707 DW_STRING_IS_CANONICAL (attr) = 0;
14708 info_ptr += bytes_read;
14711 case DW_FORM_exprloc:
14712 case DW_FORM_block:
14713 blk = dwarf_alloc_block (cu);
14714 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14715 info_ptr += bytes_read;
14716 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14717 info_ptr += blk->size;
14718 DW_BLOCK (attr) = blk;
14720 case DW_FORM_block1:
14721 blk = dwarf_alloc_block (cu);
14722 blk->size = read_1_byte (abfd, info_ptr);
14724 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14725 info_ptr += blk->size;
14726 DW_BLOCK (attr) = blk;
14728 case DW_FORM_data1:
14729 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14733 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14736 case DW_FORM_flag_present:
14737 DW_UNSND (attr) = 1;
14739 case DW_FORM_sdata:
14740 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14741 info_ptr += bytes_read;
14743 case DW_FORM_udata:
14744 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14745 info_ptr += bytes_read;
14748 DW_UNSND (attr) = (cu->header.offset.sect_off
14749 + read_1_byte (abfd, info_ptr));
14753 DW_UNSND (attr) = (cu->header.offset.sect_off
14754 + read_2_bytes (abfd, info_ptr));
14758 DW_UNSND (attr) = (cu->header.offset.sect_off
14759 + read_4_bytes (abfd, info_ptr));
14763 DW_UNSND (attr) = (cu->header.offset.sect_off
14764 + read_8_bytes (abfd, info_ptr));
14767 case DW_FORM_ref_sig8:
14768 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14771 case DW_FORM_ref_udata:
14772 DW_UNSND (attr) = (cu->header.offset.sect_off
14773 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14774 info_ptr += bytes_read;
14776 case DW_FORM_indirect:
14777 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14778 info_ptr += bytes_read;
14779 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14781 case DW_FORM_GNU_addr_index:
14782 if (reader->dwo_file == NULL)
14784 /* For now flag a hard error.
14785 Later we can turn this into a complaint. */
14786 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14787 dwarf_form_name (form),
14788 bfd_get_filename (abfd));
14790 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14791 info_ptr += bytes_read;
14793 case DW_FORM_GNU_str_index:
14794 if (reader->dwo_file == NULL)
14796 /* For now flag a hard error.
14797 Later we can turn this into a complaint if warranted. */
14798 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14799 dwarf_form_name (form),
14800 bfd_get_filename (abfd));
14803 ULONGEST str_index =
14804 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14806 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14807 DW_STRING_IS_CANONICAL (attr) = 0;
14808 info_ptr += bytes_read;
14812 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14813 dwarf_form_name (form),
14814 bfd_get_filename (abfd));
14818 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14819 attr->form = DW_FORM_GNU_ref_alt;
14821 /* We have seen instances where the compiler tried to emit a byte
14822 size attribute of -1 which ended up being encoded as an unsigned
14823 0xffffffff. Although 0xffffffff is technically a valid size value,
14824 an object of this size seems pretty unlikely so we can relatively
14825 safely treat these cases as if the size attribute was invalid and
14826 treat them as zero by default. */
14827 if (attr->name == DW_AT_byte_size
14828 && form == DW_FORM_data4
14829 && DW_UNSND (attr) >= 0xffffffff)
14832 (&symfile_complaints,
14833 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14834 hex_string (DW_UNSND (attr)));
14835 DW_UNSND (attr) = 0;
14841 /* Read an attribute described by an abbreviated attribute. */
14843 static const gdb_byte *
14844 read_attribute (const struct die_reader_specs *reader,
14845 struct attribute *attr, struct attr_abbrev *abbrev,
14846 const gdb_byte *info_ptr)
14848 attr->name = abbrev->name;
14849 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14852 /* Read dwarf information from a buffer. */
14854 static unsigned int
14855 read_1_byte (bfd *abfd, const gdb_byte *buf)
14857 return bfd_get_8 (abfd, buf);
14861 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14863 return bfd_get_signed_8 (abfd, buf);
14866 static unsigned int
14867 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14869 return bfd_get_16 (abfd, buf);
14873 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14875 return bfd_get_signed_16 (abfd, buf);
14878 static unsigned int
14879 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14881 return bfd_get_32 (abfd, buf);
14885 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14887 return bfd_get_signed_32 (abfd, buf);
14891 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14893 return bfd_get_64 (abfd, buf);
14897 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14898 unsigned int *bytes_read)
14900 struct comp_unit_head *cu_header = &cu->header;
14901 CORE_ADDR retval = 0;
14903 if (cu_header->signed_addr_p)
14905 switch (cu_header->addr_size)
14908 retval = bfd_get_signed_16 (abfd, buf);
14911 retval = bfd_get_signed_32 (abfd, buf);
14914 retval = bfd_get_signed_64 (abfd, buf);
14917 internal_error (__FILE__, __LINE__,
14918 _("read_address: bad switch, signed [in module %s]"),
14919 bfd_get_filename (abfd));
14924 switch (cu_header->addr_size)
14927 retval = bfd_get_16 (abfd, buf);
14930 retval = bfd_get_32 (abfd, buf);
14933 retval = bfd_get_64 (abfd, buf);
14936 internal_error (__FILE__, __LINE__,
14937 _("read_address: bad switch, "
14938 "unsigned [in module %s]"),
14939 bfd_get_filename (abfd));
14943 *bytes_read = cu_header->addr_size;
14947 /* Read the initial length from a section. The (draft) DWARF 3
14948 specification allows the initial length to take up either 4 bytes
14949 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14950 bytes describe the length and all offsets will be 8 bytes in length
14953 An older, non-standard 64-bit format is also handled by this
14954 function. The older format in question stores the initial length
14955 as an 8-byte quantity without an escape value. Lengths greater
14956 than 2^32 aren't very common which means that the initial 4 bytes
14957 is almost always zero. Since a length value of zero doesn't make
14958 sense for the 32-bit format, this initial zero can be considered to
14959 be an escape value which indicates the presence of the older 64-bit
14960 format. As written, the code can't detect (old format) lengths
14961 greater than 4GB. If it becomes necessary to handle lengths
14962 somewhat larger than 4GB, we could allow other small values (such
14963 as the non-sensical values of 1, 2, and 3) to also be used as
14964 escape values indicating the presence of the old format.
14966 The value returned via bytes_read should be used to increment the
14967 relevant pointer after calling read_initial_length().
14969 [ Note: read_initial_length() and read_offset() are based on the
14970 document entitled "DWARF Debugging Information Format", revision
14971 3, draft 8, dated November 19, 2001. This document was obtained
14974 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14976 This document is only a draft and is subject to change. (So beware.)
14978 Details regarding the older, non-standard 64-bit format were
14979 determined empirically by examining 64-bit ELF files produced by
14980 the SGI toolchain on an IRIX 6.5 machine.
14982 - Kevin, July 16, 2002
14986 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
14988 LONGEST length = bfd_get_32 (abfd, buf);
14990 if (length == 0xffffffff)
14992 length = bfd_get_64 (abfd, buf + 4);
14995 else if (length == 0)
14997 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
14998 length = bfd_get_64 (abfd, buf);
15009 /* Cover function for read_initial_length.
15010 Returns the length of the object at BUF, and stores the size of the
15011 initial length in *BYTES_READ and stores the size that offsets will be in
15013 If the initial length size is not equivalent to that specified in
15014 CU_HEADER then issue a complaint.
15015 This is useful when reading non-comp-unit headers. */
15018 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
15019 const struct comp_unit_head *cu_header,
15020 unsigned int *bytes_read,
15021 unsigned int *offset_size)
15023 LONGEST length = read_initial_length (abfd, buf, bytes_read);
15025 gdb_assert (cu_header->initial_length_size == 4
15026 || cu_header->initial_length_size == 8
15027 || cu_header->initial_length_size == 12);
15029 if (cu_header->initial_length_size != *bytes_read)
15030 complaint (&symfile_complaints,
15031 _("intermixed 32-bit and 64-bit DWARF sections"));
15033 *offset_size = (*bytes_read == 4) ? 4 : 8;
15037 /* Read an offset from the data stream. The size of the offset is
15038 given by cu_header->offset_size. */
15041 read_offset (bfd *abfd, const gdb_byte *buf,
15042 const struct comp_unit_head *cu_header,
15043 unsigned int *bytes_read)
15045 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
15047 *bytes_read = cu_header->offset_size;
15051 /* Read an offset from the data stream. */
15054 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
15056 LONGEST retval = 0;
15058 switch (offset_size)
15061 retval = bfd_get_32 (abfd, buf);
15064 retval = bfd_get_64 (abfd, buf);
15067 internal_error (__FILE__, __LINE__,
15068 _("read_offset_1: bad switch [in module %s]"),
15069 bfd_get_filename (abfd));
15075 static const gdb_byte *
15076 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
15078 /* If the size of a host char is 8 bits, we can return a pointer
15079 to the buffer, otherwise we have to copy the data to a buffer
15080 allocated on the temporary obstack. */
15081 gdb_assert (HOST_CHAR_BIT == 8);
15085 static const char *
15086 read_direct_string (bfd *abfd, const gdb_byte *buf,
15087 unsigned int *bytes_read_ptr)
15089 /* If the size of a host char is 8 bits, we can return a pointer
15090 to the string, otherwise we have to copy the string to a buffer
15091 allocated on the temporary obstack. */
15092 gdb_assert (HOST_CHAR_BIT == 8);
15095 *bytes_read_ptr = 1;
15098 *bytes_read_ptr = strlen ((const char *) buf) + 1;
15099 return (const char *) buf;
15102 static const char *
15103 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
15105 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
15106 if (dwarf2_per_objfile->str.buffer == NULL)
15107 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
15108 bfd_get_filename (abfd));
15109 if (str_offset >= dwarf2_per_objfile->str.size)
15110 error (_("DW_FORM_strp pointing outside of "
15111 ".debug_str section [in module %s]"),
15112 bfd_get_filename (abfd));
15113 gdb_assert (HOST_CHAR_BIT == 8);
15114 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
15116 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
15119 /* Read a string at offset STR_OFFSET in the .debug_str section from
15120 the .dwz file DWZ. Throw an error if the offset is too large. If
15121 the string consists of a single NUL byte, return NULL; otherwise
15122 return a pointer to the string. */
15124 static const char *
15125 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
15127 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
15129 if (dwz->str.buffer == NULL)
15130 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
15131 "section [in module %s]"),
15132 bfd_get_filename (dwz->dwz_bfd));
15133 if (str_offset >= dwz->str.size)
15134 error (_("DW_FORM_GNU_strp_alt pointing outside of "
15135 ".debug_str section [in module %s]"),
15136 bfd_get_filename (dwz->dwz_bfd));
15137 gdb_assert (HOST_CHAR_BIT == 8);
15138 if (dwz->str.buffer[str_offset] == '\0')
15140 return (const char *) (dwz->str.buffer + str_offset);
15143 static const char *
15144 read_indirect_string (bfd *abfd, const gdb_byte *buf,
15145 const struct comp_unit_head *cu_header,
15146 unsigned int *bytes_read_ptr)
15148 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
15150 return read_indirect_string_at_offset (abfd, str_offset);
15154 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
15155 unsigned int *bytes_read_ptr)
15158 unsigned int num_read;
15160 unsigned char byte;
15168 byte = bfd_get_8 (abfd, buf);
15171 result |= ((ULONGEST) (byte & 127) << shift);
15172 if ((byte & 128) == 0)
15178 *bytes_read_ptr = num_read;
15183 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
15184 unsigned int *bytes_read_ptr)
15187 int i, shift, num_read;
15188 unsigned char byte;
15196 byte = bfd_get_8 (abfd, buf);
15199 result |= ((LONGEST) (byte & 127) << shift);
15201 if ((byte & 128) == 0)
15206 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
15207 result |= -(((LONGEST) 1) << shift);
15208 *bytes_read_ptr = num_read;
15212 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
15213 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
15214 ADDR_SIZE is the size of addresses from the CU header. */
15217 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
15219 struct objfile *objfile = dwarf2_per_objfile->objfile;
15220 bfd *abfd = objfile->obfd;
15221 const gdb_byte *info_ptr;
15223 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
15224 if (dwarf2_per_objfile->addr.buffer == NULL)
15225 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
15227 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
15228 error (_("DW_FORM_addr_index pointing outside of "
15229 ".debug_addr section [in module %s]"),
15231 info_ptr = (dwarf2_per_objfile->addr.buffer
15232 + addr_base + addr_index * addr_size);
15233 if (addr_size == 4)
15234 return bfd_get_32 (abfd, info_ptr);
15236 return bfd_get_64 (abfd, info_ptr);
15239 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
15242 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
15244 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
15247 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
15250 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
15251 unsigned int *bytes_read)
15253 bfd *abfd = cu->objfile->obfd;
15254 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
15256 return read_addr_index (cu, addr_index);
15259 /* Data structure to pass results from dwarf2_read_addr_index_reader
15260 back to dwarf2_read_addr_index. */
15262 struct dwarf2_read_addr_index_data
15264 ULONGEST addr_base;
15268 /* die_reader_func for dwarf2_read_addr_index. */
15271 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
15272 const gdb_byte *info_ptr,
15273 struct die_info *comp_unit_die,
15277 struct dwarf2_cu *cu = reader->cu;
15278 struct dwarf2_read_addr_index_data *aidata =
15279 (struct dwarf2_read_addr_index_data *) data;
15281 aidata->addr_base = cu->addr_base;
15282 aidata->addr_size = cu->header.addr_size;
15285 /* Given an index in .debug_addr, fetch the value.
15286 NOTE: This can be called during dwarf expression evaluation,
15287 long after the debug information has been read, and thus per_cu->cu
15288 may no longer exist. */
15291 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
15292 unsigned int addr_index)
15294 struct objfile *objfile = per_cu->objfile;
15295 struct dwarf2_cu *cu = per_cu->cu;
15296 ULONGEST addr_base;
15299 /* This is intended to be called from outside this file. */
15300 dw2_setup (objfile);
15302 /* We need addr_base and addr_size.
15303 If we don't have PER_CU->cu, we have to get it.
15304 Nasty, but the alternative is storing the needed info in PER_CU,
15305 which at this point doesn't seem justified: it's not clear how frequently
15306 it would get used and it would increase the size of every PER_CU.
15307 Entry points like dwarf2_per_cu_addr_size do a similar thing
15308 so we're not in uncharted territory here.
15309 Alas we need to be a bit more complicated as addr_base is contained
15312 We don't need to read the entire CU(/TU).
15313 We just need the header and top level die.
15315 IWBN to use the aging mechanism to let us lazily later discard the CU.
15316 For now we skip this optimization. */
15320 addr_base = cu->addr_base;
15321 addr_size = cu->header.addr_size;
15325 struct dwarf2_read_addr_index_data aidata;
15327 /* Note: We can't use init_cutu_and_read_dies_simple here,
15328 we need addr_base. */
15329 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
15330 dwarf2_read_addr_index_reader, &aidata);
15331 addr_base = aidata.addr_base;
15332 addr_size = aidata.addr_size;
15335 return read_addr_index_1 (addr_index, addr_base, addr_size);
15338 /* Given a DW_AT_str_index, fetch the string. */
15340 static const char *
15341 read_str_index (const struct die_reader_specs *reader,
15342 struct dwarf2_cu *cu, ULONGEST str_index)
15344 struct objfile *objfile = dwarf2_per_objfile->objfile;
15345 const char *dwo_name = objfile->name;
15346 bfd *abfd = objfile->obfd;
15347 struct dwo_sections *sections = &reader->dwo_file->sections;
15348 const gdb_byte *info_ptr;
15349 ULONGEST str_offset;
15351 dwarf2_read_section (objfile, §ions->str);
15352 dwarf2_read_section (objfile, §ions->str_offsets);
15353 if (sections->str.buffer == NULL)
15354 error (_("DW_FORM_str_index used without .debug_str.dwo section"
15355 " in CU at offset 0x%lx [in module %s]"),
15356 (long) cu->header.offset.sect_off, dwo_name);
15357 if (sections->str_offsets.buffer == NULL)
15358 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
15359 " in CU at offset 0x%lx [in module %s]"),
15360 (long) cu->header.offset.sect_off, dwo_name);
15361 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
15362 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
15363 " section in CU at offset 0x%lx [in module %s]"),
15364 (long) cu->header.offset.sect_off, dwo_name);
15365 info_ptr = (sections->str_offsets.buffer
15366 + str_index * cu->header.offset_size);
15367 if (cu->header.offset_size == 4)
15368 str_offset = bfd_get_32 (abfd, info_ptr);
15370 str_offset = bfd_get_64 (abfd, info_ptr);
15371 if (str_offset >= sections->str.size)
15372 error (_("Offset from DW_FORM_str_index pointing outside of"
15373 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
15374 (long) cu->header.offset.sect_off, dwo_name);
15375 return (const char *) (sections->str.buffer + str_offset);
15378 /* Return the length of an LEB128 number in BUF. */
15381 leb128_size (const gdb_byte *buf)
15383 const gdb_byte *begin = buf;
15389 if ((byte & 128) == 0)
15390 return buf - begin;
15395 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
15403 cu->language = language_c;
15405 case DW_LANG_C_plus_plus:
15406 cu->language = language_cplus;
15409 cu->language = language_d;
15411 case DW_LANG_Fortran77:
15412 case DW_LANG_Fortran90:
15413 case DW_LANG_Fortran95:
15414 cu->language = language_fortran;
15417 cu->language = language_go;
15419 case DW_LANG_Mips_Assembler:
15420 cu->language = language_asm;
15423 cu->language = language_java;
15425 case DW_LANG_Ada83:
15426 case DW_LANG_Ada95:
15427 cu->language = language_ada;
15429 case DW_LANG_Modula2:
15430 cu->language = language_m2;
15432 case DW_LANG_Pascal83:
15433 cu->language = language_pascal;
15436 cu->language = language_objc;
15438 case DW_LANG_Cobol74:
15439 case DW_LANG_Cobol85:
15441 cu->language = language_minimal;
15444 cu->language_defn = language_def (cu->language);
15447 /* Return the named attribute or NULL if not there. */
15449 static struct attribute *
15450 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15455 struct attribute *spec = NULL;
15457 for (i = 0; i < die->num_attrs; ++i)
15459 if (die->attrs[i].name == name)
15460 return &die->attrs[i];
15461 if (die->attrs[i].name == DW_AT_specification
15462 || die->attrs[i].name == DW_AT_abstract_origin)
15463 spec = &die->attrs[i];
15469 die = follow_die_ref (die, spec, &cu);
15475 /* Return the named attribute or NULL if not there,
15476 but do not follow DW_AT_specification, etc.
15477 This is for use in contexts where we're reading .debug_types dies.
15478 Following DW_AT_specification, DW_AT_abstract_origin will take us
15479 back up the chain, and we want to go down. */
15481 static struct attribute *
15482 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15486 for (i = 0; i < die->num_attrs; ++i)
15487 if (die->attrs[i].name == name)
15488 return &die->attrs[i];
15493 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15494 and holds a non-zero value. This function should only be used for
15495 DW_FORM_flag or DW_FORM_flag_present attributes. */
15498 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15500 struct attribute *attr = dwarf2_attr (die, name, cu);
15502 return (attr && DW_UNSND (attr));
15506 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15508 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15509 which value is non-zero. However, we have to be careful with
15510 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15511 (via dwarf2_flag_true_p) follows this attribute. So we may
15512 end up accidently finding a declaration attribute that belongs
15513 to a different DIE referenced by the specification attribute,
15514 even though the given DIE does not have a declaration attribute. */
15515 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15516 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15519 /* Return the die giving the specification for DIE, if there is
15520 one. *SPEC_CU is the CU containing DIE on input, and the CU
15521 containing the return value on output. If there is no
15522 specification, but there is an abstract origin, that is
15525 static struct die_info *
15526 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15528 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15531 if (spec_attr == NULL)
15532 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15534 if (spec_attr == NULL)
15537 return follow_die_ref (die, spec_attr, spec_cu);
15540 /* Free the line_header structure *LH, and any arrays and strings it
15542 NOTE: This is also used as a "cleanup" function. */
15545 free_line_header (struct line_header *lh)
15547 if (lh->standard_opcode_lengths)
15548 xfree (lh->standard_opcode_lengths);
15550 /* Remember that all the lh->file_names[i].name pointers are
15551 pointers into debug_line_buffer, and don't need to be freed. */
15552 if (lh->file_names)
15553 xfree (lh->file_names);
15555 /* Similarly for the include directory names. */
15556 if (lh->include_dirs)
15557 xfree (lh->include_dirs);
15562 /* Add an entry to LH's include directory table. */
15565 add_include_dir (struct line_header *lh, const char *include_dir)
15567 /* Grow the array if necessary. */
15568 if (lh->include_dirs_size == 0)
15570 lh->include_dirs_size = 1; /* for testing */
15571 lh->include_dirs = xmalloc (lh->include_dirs_size
15572 * sizeof (*lh->include_dirs));
15574 else if (lh->num_include_dirs >= lh->include_dirs_size)
15576 lh->include_dirs_size *= 2;
15577 lh->include_dirs = xrealloc (lh->include_dirs,
15578 (lh->include_dirs_size
15579 * sizeof (*lh->include_dirs)));
15582 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15585 /* Add an entry to LH's file name table. */
15588 add_file_name (struct line_header *lh,
15590 unsigned int dir_index,
15591 unsigned int mod_time,
15592 unsigned int length)
15594 struct file_entry *fe;
15596 /* Grow the array if necessary. */
15597 if (lh->file_names_size == 0)
15599 lh->file_names_size = 1; /* for testing */
15600 lh->file_names = xmalloc (lh->file_names_size
15601 * sizeof (*lh->file_names));
15603 else if (lh->num_file_names >= lh->file_names_size)
15605 lh->file_names_size *= 2;
15606 lh->file_names = xrealloc (lh->file_names,
15607 (lh->file_names_size
15608 * sizeof (*lh->file_names)));
15611 fe = &lh->file_names[lh->num_file_names++];
15613 fe->dir_index = dir_index;
15614 fe->mod_time = mod_time;
15615 fe->length = length;
15616 fe->included_p = 0;
15620 /* A convenience function to find the proper .debug_line section for a
15623 static struct dwarf2_section_info *
15624 get_debug_line_section (struct dwarf2_cu *cu)
15626 struct dwarf2_section_info *section;
15628 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15630 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15631 section = &cu->dwo_unit->dwo_file->sections.line;
15632 else if (cu->per_cu->is_dwz)
15634 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15636 section = &dwz->line;
15639 section = &dwarf2_per_objfile->line;
15644 /* Read the statement program header starting at OFFSET in
15645 .debug_line, or .debug_line.dwo. Return a pointer
15646 to a struct line_header, allocated using xmalloc.
15648 NOTE: the strings in the include directory and file name tables of
15649 the returned object point into the dwarf line section buffer,
15650 and must not be freed. */
15652 static struct line_header *
15653 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15655 struct cleanup *back_to;
15656 struct line_header *lh;
15657 const gdb_byte *line_ptr;
15658 unsigned int bytes_read, offset_size;
15660 const char *cur_dir, *cur_file;
15661 struct dwarf2_section_info *section;
15664 section = get_debug_line_section (cu);
15665 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15666 if (section->buffer == NULL)
15668 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15669 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15671 complaint (&symfile_complaints, _("missing .debug_line section"));
15675 /* We can't do this until we know the section is non-empty.
15676 Only then do we know we have such a section. */
15677 abfd = section->asection->owner;
15679 /* Make sure that at least there's room for the total_length field.
15680 That could be 12 bytes long, but we're just going to fudge that. */
15681 if (offset + 4 >= section->size)
15683 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15687 lh = xmalloc (sizeof (*lh));
15688 memset (lh, 0, sizeof (*lh));
15689 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15692 line_ptr = section->buffer + offset;
15694 /* Read in the header. */
15696 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15697 &bytes_read, &offset_size);
15698 line_ptr += bytes_read;
15699 if (line_ptr + lh->total_length > (section->buffer + section->size))
15701 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15702 do_cleanups (back_to);
15705 lh->statement_program_end = line_ptr + lh->total_length;
15706 lh->version = read_2_bytes (abfd, line_ptr);
15708 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15709 line_ptr += offset_size;
15710 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15712 if (lh->version >= 4)
15714 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15718 lh->maximum_ops_per_instruction = 1;
15720 if (lh->maximum_ops_per_instruction == 0)
15722 lh->maximum_ops_per_instruction = 1;
15723 complaint (&symfile_complaints,
15724 _("invalid maximum_ops_per_instruction "
15725 "in `.debug_line' section"));
15728 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15730 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15732 lh->line_range = read_1_byte (abfd, line_ptr);
15734 lh->opcode_base = read_1_byte (abfd, line_ptr);
15736 lh->standard_opcode_lengths
15737 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15739 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15740 for (i = 1; i < lh->opcode_base; ++i)
15742 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15746 /* Read directory table. */
15747 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15749 line_ptr += bytes_read;
15750 add_include_dir (lh, cur_dir);
15752 line_ptr += bytes_read;
15754 /* Read file name table. */
15755 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15757 unsigned int dir_index, mod_time, length;
15759 line_ptr += bytes_read;
15760 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15761 line_ptr += bytes_read;
15762 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15763 line_ptr += bytes_read;
15764 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15765 line_ptr += bytes_read;
15767 add_file_name (lh, cur_file, dir_index, mod_time, length);
15769 line_ptr += bytes_read;
15770 lh->statement_program_start = line_ptr;
15772 if (line_ptr > (section->buffer + section->size))
15773 complaint (&symfile_complaints,
15774 _("line number info header doesn't "
15775 "fit in `.debug_line' section"));
15777 discard_cleanups (back_to);
15781 /* Subroutine of dwarf_decode_lines to simplify it.
15782 Return the file name of the psymtab for included file FILE_INDEX
15783 in line header LH of PST.
15784 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15785 If space for the result is malloc'd, it will be freed by a cleanup.
15786 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15788 The function creates dangling cleanup registration. */
15790 static const char *
15791 psymtab_include_file_name (const struct line_header *lh, int file_index,
15792 const struct partial_symtab *pst,
15793 const char *comp_dir)
15795 const struct file_entry fe = lh->file_names [file_index];
15796 const char *include_name = fe.name;
15797 const char *include_name_to_compare = include_name;
15798 const char *dir_name = NULL;
15799 const char *pst_filename;
15800 char *copied_name = NULL;
15804 dir_name = lh->include_dirs[fe.dir_index - 1];
15806 if (!IS_ABSOLUTE_PATH (include_name)
15807 && (dir_name != NULL || comp_dir != NULL))
15809 /* Avoid creating a duplicate psymtab for PST.
15810 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15811 Before we do the comparison, however, we need to account
15812 for DIR_NAME and COMP_DIR.
15813 First prepend dir_name (if non-NULL). If we still don't
15814 have an absolute path prepend comp_dir (if non-NULL).
15815 However, the directory we record in the include-file's
15816 psymtab does not contain COMP_DIR (to match the
15817 corresponding symtab(s)).
15822 bash$ gcc -g ./hello.c
15823 include_name = "hello.c"
15825 DW_AT_comp_dir = comp_dir = "/tmp"
15826 DW_AT_name = "./hello.c" */
15828 if (dir_name != NULL)
15830 char *tem = concat (dir_name, SLASH_STRING,
15831 include_name, (char *)NULL);
15833 make_cleanup (xfree, tem);
15834 include_name = tem;
15835 include_name_to_compare = include_name;
15837 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15839 char *tem = concat (comp_dir, SLASH_STRING,
15840 include_name, (char *)NULL);
15842 make_cleanup (xfree, tem);
15843 include_name_to_compare = tem;
15847 pst_filename = pst->filename;
15848 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15850 copied_name = concat (pst->dirname, SLASH_STRING,
15851 pst_filename, (char *)NULL);
15852 pst_filename = copied_name;
15855 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15857 if (copied_name != NULL)
15858 xfree (copied_name);
15862 return include_name;
15865 /* Ignore this record_line request. */
15868 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15873 /* Subroutine of dwarf_decode_lines to simplify it.
15874 Process the line number information in LH. */
15877 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15878 struct dwarf2_cu *cu, struct partial_symtab *pst)
15880 const gdb_byte *line_ptr, *extended_end;
15881 const gdb_byte *line_end;
15882 unsigned int bytes_read, extended_len;
15883 unsigned char op_code, extended_op, adj_opcode;
15884 CORE_ADDR baseaddr;
15885 struct objfile *objfile = cu->objfile;
15886 bfd *abfd = objfile->obfd;
15887 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15888 const int decode_for_pst_p = (pst != NULL);
15889 struct subfile *last_subfile = NULL;
15890 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15893 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15895 line_ptr = lh->statement_program_start;
15896 line_end = lh->statement_program_end;
15898 /* Read the statement sequences until there's nothing left. */
15899 while (line_ptr < line_end)
15901 /* state machine registers */
15902 CORE_ADDR address = 0;
15903 unsigned int file = 1;
15904 unsigned int line = 1;
15905 unsigned int column = 0;
15906 int is_stmt = lh->default_is_stmt;
15907 int basic_block = 0;
15908 int end_sequence = 0;
15910 unsigned char op_index = 0;
15912 if (!decode_for_pst_p && lh->num_file_names >= file)
15914 /* Start a subfile for the current file of the state machine. */
15915 /* lh->include_dirs and lh->file_names are 0-based, but the
15916 directory and file name numbers in the statement program
15918 struct file_entry *fe = &lh->file_names[file - 1];
15919 const char *dir = NULL;
15922 dir = lh->include_dirs[fe->dir_index - 1];
15924 dwarf2_start_subfile (fe->name, dir, comp_dir);
15927 /* Decode the table. */
15928 while (!end_sequence)
15930 op_code = read_1_byte (abfd, line_ptr);
15932 if (line_ptr > line_end)
15934 dwarf2_debug_line_missing_end_sequence_complaint ();
15938 if (op_code >= lh->opcode_base)
15940 /* Special operand. */
15941 adj_opcode = op_code - lh->opcode_base;
15942 address += (((op_index + (adj_opcode / lh->line_range))
15943 / lh->maximum_ops_per_instruction)
15944 * lh->minimum_instruction_length);
15945 op_index = ((op_index + (adj_opcode / lh->line_range))
15946 % lh->maximum_ops_per_instruction);
15947 line += lh->line_base + (adj_opcode % lh->line_range);
15948 if (lh->num_file_names < file || file == 0)
15949 dwarf2_debug_line_missing_file_complaint ();
15950 /* For now we ignore lines not starting on an
15951 instruction boundary. */
15952 else if (op_index == 0)
15954 lh->file_names[file - 1].included_p = 1;
15955 if (!decode_for_pst_p && is_stmt)
15957 if (last_subfile != current_subfile)
15959 addr = gdbarch_addr_bits_remove (gdbarch, address);
15961 (*p_record_line) (last_subfile, 0, addr);
15962 last_subfile = current_subfile;
15964 /* Append row to matrix using current values. */
15965 addr = gdbarch_addr_bits_remove (gdbarch, address);
15966 (*p_record_line) (current_subfile, line, addr);
15971 else switch (op_code)
15973 case DW_LNS_extended_op:
15974 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15976 line_ptr += bytes_read;
15977 extended_end = line_ptr + extended_len;
15978 extended_op = read_1_byte (abfd, line_ptr);
15980 switch (extended_op)
15982 case DW_LNE_end_sequence:
15983 p_record_line = record_line;
15986 case DW_LNE_set_address:
15987 address = read_address (abfd, line_ptr, cu, &bytes_read);
15989 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15991 /* This line table is for a function which has been
15992 GCd by the linker. Ignore it. PR gdb/12528 */
15995 = line_ptr - get_debug_line_section (cu)->buffer;
15997 complaint (&symfile_complaints,
15998 _(".debug_line address at offset 0x%lx is 0 "
16000 line_offset, objfile->name);
16001 p_record_line = noop_record_line;
16005 line_ptr += bytes_read;
16006 address += baseaddr;
16008 case DW_LNE_define_file:
16010 const char *cur_file;
16011 unsigned int dir_index, mod_time, length;
16013 cur_file = read_direct_string (abfd, line_ptr,
16015 line_ptr += bytes_read;
16017 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16018 line_ptr += bytes_read;
16020 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16021 line_ptr += bytes_read;
16023 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16024 line_ptr += bytes_read;
16025 add_file_name (lh, cur_file, dir_index, mod_time, length);
16028 case DW_LNE_set_discriminator:
16029 /* The discriminator is not interesting to the debugger;
16031 line_ptr = extended_end;
16034 complaint (&symfile_complaints,
16035 _("mangled .debug_line section"));
16038 /* Make sure that we parsed the extended op correctly. If e.g.
16039 we expected a different address size than the producer used,
16040 we may have read the wrong number of bytes. */
16041 if (line_ptr != extended_end)
16043 complaint (&symfile_complaints,
16044 _("mangled .debug_line section"));
16049 if (lh->num_file_names < file || file == 0)
16050 dwarf2_debug_line_missing_file_complaint ();
16053 lh->file_names[file - 1].included_p = 1;
16054 if (!decode_for_pst_p && is_stmt)
16056 if (last_subfile != current_subfile)
16058 addr = gdbarch_addr_bits_remove (gdbarch, address);
16060 (*p_record_line) (last_subfile, 0, addr);
16061 last_subfile = current_subfile;
16063 addr = gdbarch_addr_bits_remove (gdbarch, address);
16064 (*p_record_line) (current_subfile, line, addr);
16069 case DW_LNS_advance_pc:
16072 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16074 address += (((op_index + adjust)
16075 / lh->maximum_ops_per_instruction)
16076 * lh->minimum_instruction_length);
16077 op_index = ((op_index + adjust)
16078 % lh->maximum_ops_per_instruction);
16079 line_ptr += bytes_read;
16082 case DW_LNS_advance_line:
16083 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
16084 line_ptr += bytes_read;
16086 case DW_LNS_set_file:
16088 /* The arrays lh->include_dirs and lh->file_names are
16089 0-based, but the directory and file name numbers in
16090 the statement program are 1-based. */
16091 struct file_entry *fe;
16092 const char *dir = NULL;
16094 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16095 line_ptr += bytes_read;
16096 if (lh->num_file_names < file || file == 0)
16097 dwarf2_debug_line_missing_file_complaint ();
16100 fe = &lh->file_names[file - 1];
16102 dir = lh->include_dirs[fe->dir_index - 1];
16103 if (!decode_for_pst_p)
16105 last_subfile = current_subfile;
16106 dwarf2_start_subfile (fe->name, dir, comp_dir);
16111 case DW_LNS_set_column:
16112 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16113 line_ptr += bytes_read;
16115 case DW_LNS_negate_stmt:
16116 is_stmt = (!is_stmt);
16118 case DW_LNS_set_basic_block:
16121 /* Add to the address register of the state machine the
16122 address increment value corresponding to special opcode
16123 255. I.e., this value is scaled by the minimum
16124 instruction length since special opcode 255 would have
16125 scaled the increment. */
16126 case DW_LNS_const_add_pc:
16128 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
16130 address += (((op_index + adjust)
16131 / lh->maximum_ops_per_instruction)
16132 * lh->minimum_instruction_length);
16133 op_index = ((op_index + adjust)
16134 % lh->maximum_ops_per_instruction);
16137 case DW_LNS_fixed_advance_pc:
16138 address += read_2_bytes (abfd, line_ptr);
16144 /* Unknown standard opcode, ignore it. */
16147 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
16149 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16150 line_ptr += bytes_read;
16155 if (lh->num_file_names < file || file == 0)
16156 dwarf2_debug_line_missing_file_complaint ();
16159 lh->file_names[file - 1].included_p = 1;
16160 if (!decode_for_pst_p)
16162 addr = gdbarch_addr_bits_remove (gdbarch, address);
16163 (*p_record_line) (current_subfile, 0, addr);
16169 /* Decode the Line Number Program (LNP) for the given line_header
16170 structure and CU. The actual information extracted and the type
16171 of structures created from the LNP depends on the value of PST.
16173 1. If PST is NULL, then this procedure uses the data from the program
16174 to create all necessary symbol tables, and their linetables.
16176 2. If PST is not NULL, this procedure reads the program to determine
16177 the list of files included by the unit represented by PST, and
16178 builds all the associated partial symbol tables.
16180 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16181 It is used for relative paths in the line table.
16182 NOTE: When processing partial symtabs (pst != NULL),
16183 comp_dir == pst->dirname.
16185 NOTE: It is important that psymtabs have the same file name (via strcmp)
16186 as the corresponding symtab. Since COMP_DIR is not used in the name of the
16187 symtab we don't use it in the name of the psymtabs we create.
16188 E.g. expand_line_sal requires this when finding psymtabs to expand.
16189 A good testcase for this is mb-inline.exp. */
16192 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
16193 struct dwarf2_cu *cu, struct partial_symtab *pst,
16194 int want_line_info)
16196 struct objfile *objfile = cu->objfile;
16197 const int decode_for_pst_p = (pst != NULL);
16198 struct subfile *first_subfile = current_subfile;
16200 if (want_line_info)
16201 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
16203 if (decode_for_pst_p)
16207 /* Now that we're done scanning the Line Header Program, we can
16208 create the psymtab of each included file. */
16209 for (file_index = 0; file_index < lh->num_file_names; file_index++)
16210 if (lh->file_names[file_index].included_p == 1)
16212 const char *include_name =
16213 psymtab_include_file_name (lh, file_index, pst, comp_dir);
16214 if (include_name != NULL)
16215 dwarf2_create_include_psymtab (include_name, pst, objfile);
16220 /* Make sure a symtab is created for every file, even files
16221 which contain only variables (i.e. no code with associated
16225 for (i = 0; i < lh->num_file_names; i++)
16227 const char *dir = NULL;
16228 struct file_entry *fe;
16230 fe = &lh->file_names[i];
16232 dir = lh->include_dirs[fe->dir_index - 1];
16233 dwarf2_start_subfile (fe->name, dir, comp_dir);
16235 /* Skip the main file; we don't need it, and it must be
16236 allocated last, so that it will show up before the
16237 non-primary symtabs in the objfile's symtab list. */
16238 if (current_subfile == first_subfile)
16241 if (current_subfile->symtab == NULL)
16242 current_subfile->symtab = allocate_symtab (current_subfile->name,
16244 fe->symtab = current_subfile->symtab;
16249 /* Start a subfile for DWARF. FILENAME is the name of the file and
16250 DIRNAME the name of the source directory which contains FILENAME
16251 or NULL if not known. COMP_DIR is the compilation directory for the
16252 linetable's compilation unit or NULL if not known.
16253 This routine tries to keep line numbers from identical absolute and
16254 relative file names in a common subfile.
16256 Using the `list' example from the GDB testsuite, which resides in
16257 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
16258 of /srcdir/list0.c yields the following debugging information for list0.c:
16260 DW_AT_name: /srcdir/list0.c
16261 DW_AT_comp_dir: /compdir
16262 files.files[0].name: list0.h
16263 files.files[0].dir: /srcdir
16264 files.files[1].name: list0.c
16265 files.files[1].dir: /srcdir
16267 The line number information for list0.c has to end up in a single
16268 subfile, so that `break /srcdir/list0.c:1' works as expected.
16269 start_subfile will ensure that this happens provided that we pass the
16270 concatenation of files.files[1].dir and files.files[1].name as the
16274 dwarf2_start_subfile (const char *filename, const char *dirname,
16275 const char *comp_dir)
16279 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
16280 `start_symtab' will always pass the contents of DW_AT_comp_dir as
16281 second argument to start_subfile. To be consistent, we do the
16282 same here. In order not to lose the line information directory,
16283 we concatenate it to the filename when it makes sense.
16284 Note that the Dwarf3 standard says (speaking of filenames in line
16285 information): ``The directory index is ignored for file names
16286 that represent full path names''. Thus ignoring dirname in the
16287 `else' branch below isn't an issue. */
16289 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
16291 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
16295 start_subfile (filename, comp_dir);
16301 /* Start a symtab for DWARF.
16302 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
16305 dwarf2_start_symtab (struct dwarf2_cu *cu,
16306 const char *name, const char *comp_dir, CORE_ADDR low_pc)
16308 start_symtab (name, comp_dir, low_pc);
16309 record_debugformat ("DWARF 2");
16310 record_producer (cu->producer);
16312 /* We assume that we're processing GCC output. */
16313 processing_gcc_compilation = 2;
16315 cu->processing_has_namespace_info = 0;
16319 var_decode_location (struct attribute *attr, struct symbol *sym,
16320 struct dwarf2_cu *cu)
16322 struct objfile *objfile = cu->objfile;
16323 struct comp_unit_head *cu_header = &cu->header;
16325 /* NOTE drow/2003-01-30: There used to be a comment and some special
16326 code here to turn a symbol with DW_AT_external and a
16327 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
16328 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
16329 with some versions of binutils) where shared libraries could have
16330 relocations against symbols in their debug information - the
16331 minimal symbol would have the right address, but the debug info
16332 would not. It's no longer necessary, because we will explicitly
16333 apply relocations when we read in the debug information now. */
16335 /* A DW_AT_location attribute with no contents indicates that a
16336 variable has been optimized away. */
16337 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
16339 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16343 /* Handle one degenerate form of location expression specially, to
16344 preserve GDB's previous behavior when section offsets are
16345 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
16346 then mark this symbol as LOC_STATIC. */
16348 if (attr_form_is_block (attr)
16349 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
16350 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
16351 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
16352 && (DW_BLOCK (attr)->size
16353 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
16355 unsigned int dummy;
16357 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
16358 SYMBOL_VALUE_ADDRESS (sym) =
16359 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
16361 SYMBOL_VALUE_ADDRESS (sym) =
16362 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
16363 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
16364 fixup_symbol_section (sym, objfile);
16365 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
16366 SYMBOL_SECTION (sym));
16370 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
16371 expression evaluator, and use LOC_COMPUTED only when necessary
16372 (i.e. when the value of a register or memory location is
16373 referenced, or a thread-local block, etc.). Then again, it might
16374 not be worthwhile. I'm assuming that it isn't unless performance
16375 or memory numbers show me otherwise. */
16377 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
16379 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
16380 cu->has_loclist = 1;
16383 /* Given a pointer to a DWARF information entry, figure out if we need
16384 to make a symbol table entry for it, and if so, create a new entry
16385 and return a pointer to it.
16386 If TYPE is NULL, determine symbol type from the die, otherwise
16387 used the passed type.
16388 If SPACE is not NULL, use it to hold the new symbol. If it is
16389 NULL, allocate a new symbol on the objfile's obstack. */
16391 static struct symbol *
16392 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
16393 struct symbol *space)
16395 struct objfile *objfile = cu->objfile;
16396 struct symbol *sym = NULL;
16398 struct attribute *attr = NULL;
16399 struct attribute *attr2 = NULL;
16400 CORE_ADDR baseaddr;
16401 struct pending **list_to_add = NULL;
16403 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
16405 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
16407 name = dwarf2_name (die, cu);
16410 const char *linkagename;
16411 int suppress_add = 0;
16416 sym = allocate_symbol (objfile);
16417 OBJSTAT (objfile, n_syms++);
16419 /* Cache this symbol's name and the name's demangled form (if any). */
16420 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
16421 linkagename = dwarf2_physname (name, die, cu);
16422 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
16424 /* Fortran does not have mangling standard and the mangling does differ
16425 between gfortran, iFort etc. */
16426 if (cu->language == language_fortran
16427 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
16428 symbol_set_demangled_name (&(sym->ginfo),
16429 dwarf2_full_name (name, die, cu),
16432 /* Default assumptions.
16433 Use the passed type or decode it from the die. */
16434 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16435 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16437 SYMBOL_TYPE (sym) = type;
16439 SYMBOL_TYPE (sym) = die_type (die, cu);
16440 attr = dwarf2_attr (die,
16441 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16445 SYMBOL_LINE (sym) = DW_UNSND (attr);
16448 attr = dwarf2_attr (die,
16449 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16453 int file_index = DW_UNSND (attr);
16455 if (cu->line_header == NULL
16456 || file_index > cu->line_header->num_file_names)
16457 complaint (&symfile_complaints,
16458 _("file index out of range"));
16459 else if (file_index > 0)
16461 struct file_entry *fe;
16463 fe = &cu->line_header->file_names[file_index - 1];
16464 SYMBOL_SYMTAB (sym) = fe->symtab;
16471 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16474 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16476 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16477 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16478 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16479 add_symbol_to_list (sym, cu->list_in_scope);
16481 case DW_TAG_subprogram:
16482 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16484 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16485 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16486 if ((attr2 && (DW_UNSND (attr2) != 0))
16487 || cu->language == language_ada)
16489 /* Subprograms marked external are stored as a global symbol.
16490 Ada subprograms, whether marked external or not, are always
16491 stored as a global symbol, because we want to be able to
16492 access them globally. For instance, we want to be able
16493 to break on a nested subprogram without having to
16494 specify the context. */
16495 list_to_add = &global_symbols;
16499 list_to_add = cu->list_in_scope;
16502 case DW_TAG_inlined_subroutine:
16503 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16505 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16506 SYMBOL_INLINED (sym) = 1;
16507 list_to_add = cu->list_in_scope;
16509 case DW_TAG_template_value_param:
16511 /* Fall through. */
16512 case DW_TAG_constant:
16513 case DW_TAG_variable:
16514 case DW_TAG_member:
16515 /* Compilation with minimal debug info may result in
16516 variables with missing type entries. Change the
16517 misleading `void' type to something sensible. */
16518 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16520 = objfile_type (objfile)->nodebug_data_symbol;
16522 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16523 /* In the case of DW_TAG_member, we should only be called for
16524 static const members. */
16525 if (die->tag == DW_TAG_member)
16527 /* dwarf2_add_field uses die_is_declaration,
16528 so we do the same. */
16529 gdb_assert (die_is_declaration (die, cu));
16534 dwarf2_const_value (attr, sym, cu);
16535 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16538 if (attr2 && (DW_UNSND (attr2) != 0))
16539 list_to_add = &global_symbols;
16541 list_to_add = cu->list_in_scope;
16545 attr = dwarf2_attr (die, DW_AT_location, cu);
16548 var_decode_location (attr, sym, cu);
16549 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16551 /* Fortran explicitly imports any global symbols to the local
16552 scope by DW_TAG_common_block. */
16553 if (cu->language == language_fortran && die->parent
16554 && die->parent->tag == DW_TAG_common_block)
16557 if (SYMBOL_CLASS (sym) == LOC_STATIC
16558 && SYMBOL_VALUE_ADDRESS (sym) == 0
16559 && !dwarf2_per_objfile->has_section_at_zero)
16561 /* When a static variable is eliminated by the linker,
16562 the corresponding debug information is not stripped
16563 out, but the variable address is set to null;
16564 do not add such variables into symbol table. */
16566 else if (attr2 && (DW_UNSND (attr2) != 0))
16568 /* Workaround gfortran PR debug/40040 - it uses
16569 DW_AT_location for variables in -fPIC libraries which may
16570 get overriden by other libraries/executable and get
16571 a different address. Resolve it by the minimal symbol
16572 which may come from inferior's executable using copy
16573 relocation. Make this workaround only for gfortran as for
16574 other compilers GDB cannot guess the minimal symbol
16575 Fortran mangling kind. */
16576 if (cu->language == language_fortran && die->parent
16577 && die->parent->tag == DW_TAG_module
16579 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16580 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16582 /* A variable with DW_AT_external is never static,
16583 but it may be block-scoped. */
16584 list_to_add = (cu->list_in_scope == &file_symbols
16585 ? &global_symbols : cu->list_in_scope);
16588 list_to_add = cu->list_in_scope;
16592 /* We do not know the address of this symbol.
16593 If it is an external symbol and we have type information
16594 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16595 The address of the variable will then be determined from
16596 the minimal symbol table whenever the variable is
16598 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16600 /* Fortran explicitly imports any global symbols to the local
16601 scope by DW_TAG_common_block. */
16602 if (cu->language == language_fortran && die->parent
16603 && die->parent->tag == DW_TAG_common_block)
16605 /* SYMBOL_CLASS doesn't matter here because
16606 read_common_block is going to reset it. */
16608 list_to_add = cu->list_in_scope;
16610 else if (attr2 && (DW_UNSND (attr2) != 0)
16611 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16613 /* A variable with DW_AT_external is never static, but it
16614 may be block-scoped. */
16615 list_to_add = (cu->list_in_scope == &file_symbols
16616 ? &global_symbols : cu->list_in_scope);
16618 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16620 else if (!die_is_declaration (die, cu))
16622 /* Use the default LOC_OPTIMIZED_OUT class. */
16623 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16625 list_to_add = cu->list_in_scope;
16629 case DW_TAG_formal_parameter:
16630 /* If we are inside a function, mark this as an argument. If
16631 not, we might be looking at an argument to an inlined function
16632 when we do not have enough information to show inlined frames;
16633 pretend it's a local variable in that case so that the user can
16635 if (context_stack_depth > 0
16636 && context_stack[context_stack_depth - 1].name != NULL)
16637 SYMBOL_IS_ARGUMENT (sym) = 1;
16638 attr = dwarf2_attr (die, DW_AT_location, cu);
16641 var_decode_location (attr, sym, cu);
16643 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16646 dwarf2_const_value (attr, sym, cu);
16649 list_to_add = cu->list_in_scope;
16651 case DW_TAG_unspecified_parameters:
16652 /* From varargs functions; gdb doesn't seem to have any
16653 interest in this information, so just ignore it for now.
16656 case DW_TAG_template_type_param:
16658 /* Fall through. */
16659 case DW_TAG_class_type:
16660 case DW_TAG_interface_type:
16661 case DW_TAG_structure_type:
16662 case DW_TAG_union_type:
16663 case DW_TAG_set_type:
16664 case DW_TAG_enumeration_type:
16665 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16666 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16669 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16670 really ever be static objects: otherwise, if you try
16671 to, say, break of a class's method and you're in a file
16672 which doesn't mention that class, it won't work unless
16673 the check for all static symbols in lookup_symbol_aux
16674 saves you. See the OtherFileClass tests in
16675 gdb.c++/namespace.exp. */
16679 list_to_add = (cu->list_in_scope == &file_symbols
16680 && (cu->language == language_cplus
16681 || cu->language == language_java)
16682 ? &global_symbols : cu->list_in_scope);
16684 /* The semantics of C++ state that "struct foo {
16685 ... }" also defines a typedef for "foo". A Java
16686 class declaration also defines a typedef for the
16688 if (cu->language == language_cplus
16689 || cu->language == language_java
16690 || cu->language == language_ada)
16692 /* The symbol's name is already allocated along
16693 with this objfile, so we don't need to
16694 duplicate it for the type. */
16695 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16696 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16701 case DW_TAG_typedef:
16702 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16703 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16704 list_to_add = cu->list_in_scope;
16706 case DW_TAG_base_type:
16707 case DW_TAG_subrange_type:
16708 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16709 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16710 list_to_add = cu->list_in_scope;
16712 case DW_TAG_enumerator:
16713 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16716 dwarf2_const_value (attr, sym, cu);
16719 /* NOTE: carlton/2003-11-10: See comment above in the
16720 DW_TAG_class_type, etc. block. */
16722 list_to_add = (cu->list_in_scope == &file_symbols
16723 && (cu->language == language_cplus
16724 || cu->language == language_java)
16725 ? &global_symbols : cu->list_in_scope);
16728 case DW_TAG_namespace:
16729 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16730 list_to_add = &global_symbols;
16732 case DW_TAG_common_block:
16733 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16734 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16735 add_symbol_to_list (sym, cu->list_in_scope);
16738 /* Not a tag we recognize. Hopefully we aren't processing
16739 trash data, but since we must specifically ignore things
16740 we don't recognize, there is nothing else we should do at
16742 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16743 dwarf_tag_name (die->tag));
16749 sym->hash_next = objfile->template_symbols;
16750 objfile->template_symbols = sym;
16751 list_to_add = NULL;
16754 if (list_to_add != NULL)
16755 add_symbol_to_list (sym, list_to_add);
16757 /* For the benefit of old versions of GCC, check for anonymous
16758 namespaces based on the demangled name. */
16759 if (!cu->processing_has_namespace_info
16760 && cu->language == language_cplus)
16761 cp_scan_for_anonymous_namespaces (sym, objfile);
16766 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16768 static struct symbol *
16769 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16771 return new_symbol_full (die, type, cu, NULL);
16774 /* Given an attr with a DW_FORM_dataN value in host byte order,
16775 zero-extend it as appropriate for the symbol's type. The DWARF
16776 standard (v4) is not entirely clear about the meaning of using
16777 DW_FORM_dataN for a constant with a signed type, where the type is
16778 wider than the data. The conclusion of a discussion on the DWARF
16779 list was that this is unspecified. We choose to always zero-extend
16780 because that is the interpretation long in use by GCC. */
16783 dwarf2_const_value_data (struct attribute *attr, struct obstack *obstack,
16784 struct dwarf2_cu *cu, LONGEST *value, int bits)
16786 struct objfile *objfile = cu->objfile;
16787 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16788 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16789 LONGEST l = DW_UNSND (attr);
16791 if (bits < sizeof (*value) * 8)
16793 l &= ((LONGEST) 1 << bits) - 1;
16796 else if (bits == sizeof (*value) * 8)
16800 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16801 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16808 /* Read a constant value from an attribute. Either set *VALUE, or if
16809 the value does not fit in *VALUE, set *BYTES - either already
16810 allocated on the objfile obstack, or newly allocated on OBSTACK,
16811 or, set *BATON, if we translated the constant to a location
16815 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16816 const char *name, struct obstack *obstack,
16817 struct dwarf2_cu *cu,
16818 LONGEST *value, const gdb_byte **bytes,
16819 struct dwarf2_locexpr_baton **baton)
16821 struct objfile *objfile = cu->objfile;
16822 struct comp_unit_head *cu_header = &cu->header;
16823 struct dwarf_block *blk;
16824 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16825 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16831 switch (attr->form)
16834 case DW_FORM_GNU_addr_index:
16838 if (TYPE_LENGTH (type) != cu_header->addr_size)
16839 dwarf2_const_value_length_mismatch_complaint (name,
16840 cu_header->addr_size,
16841 TYPE_LENGTH (type));
16842 /* Symbols of this form are reasonably rare, so we just
16843 piggyback on the existing location code rather than writing
16844 a new implementation of symbol_computed_ops. */
16845 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
16846 (*baton)->per_cu = cu->per_cu;
16847 gdb_assert ((*baton)->per_cu);
16849 (*baton)->size = 2 + cu_header->addr_size;
16850 data = obstack_alloc (obstack, (*baton)->size);
16851 (*baton)->data = data;
16853 data[0] = DW_OP_addr;
16854 store_unsigned_integer (&data[1], cu_header->addr_size,
16855 byte_order, DW_ADDR (attr));
16856 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16859 case DW_FORM_string:
16861 case DW_FORM_GNU_str_index:
16862 case DW_FORM_GNU_strp_alt:
16863 /* DW_STRING is already allocated on the objfile obstack, point
16865 *bytes = (const gdb_byte *) DW_STRING (attr);
16867 case DW_FORM_block1:
16868 case DW_FORM_block2:
16869 case DW_FORM_block4:
16870 case DW_FORM_block:
16871 case DW_FORM_exprloc:
16872 blk = DW_BLOCK (attr);
16873 if (TYPE_LENGTH (type) != blk->size)
16874 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16875 TYPE_LENGTH (type));
16876 *bytes = blk->data;
16879 /* The DW_AT_const_value attributes are supposed to carry the
16880 symbol's value "represented as it would be on the target
16881 architecture." By the time we get here, it's already been
16882 converted to host endianness, so we just need to sign- or
16883 zero-extend it as appropriate. */
16884 case DW_FORM_data1:
16885 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
16887 case DW_FORM_data2:
16888 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
16890 case DW_FORM_data4:
16891 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
16893 case DW_FORM_data8:
16894 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
16897 case DW_FORM_sdata:
16898 *value = DW_SND (attr);
16901 case DW_FORM_udata:
16902 *value = DW_UNSND (attr);
16906 complaint (&symfile_complaints,
16907 _("unsupported const value attribute form: '%s'"),
16908 dwarf_form_name (attr->form));
16915 /* Copy constant value from an attribute to a symbol. */
16918 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16919 struct dwarf2_cu *cu)
16921 struct objfile *objfile = cu->objfile;
16922 struct comp_unit_head *cu_header = &cu->header;
16924 const gdb_byte *bytes;
16925 struct dwarf2_locexpr_baton *baton;
16927 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16928 SYMBOL_PRINT_NAME (sym),
16929 &objfile->objfile_obstack, cu,
16930 &value, &bytes, &baton);
16934 SYMBOL_LOCATION_BATON (sym) = baton;
16935 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16937 else if (bytes != NULL)
16939 SYMBOL_VALUE_BYTES (sym) = bytes;
16940 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16944 SYMBOL_VALUE (sym) = value;
16945 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16949 /* Return the type of the die in question using its DW_AT_type attribute. */
16951 static struct type *
16952 die_type (struct die_info *die, struct dwarf2_cu *cu)
16954 struct attribute *type_attr;
16956 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16959 /* A missing DW_AT_type represents a void type. */
16960 return objfile_type (cu->objfile)->builtin_void;
16963 return lookup_die_type (die, type_attr, cu);
16966 /* True iff CU's producer generates GNAT Ada auxiliary information
16967 that allows to find parallel types through that information instead
16968 of having to do expensive parallel lookups by type name. */
16971 need_gnat_info (struct dwarf2_cu *cu)
16973 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16974 of GNAT produces this auxiliary information, without any indication
16975 that it is produced. Part of enhancing the FSF version of GNAT
16976 to produce that information will be to put in place an indicator
16977 that we can use in order to determine whether the descriptive type
16978 info is available or not. One suggestion that has been made is
16979 to use a new attribute, attached to the CU die. For now, assume
16980 that the descriptive type info is not available. */
16984 /* Return the auxiliary type of the die in question using its
16985 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16986 attribute is not present. */
16988 static struct type *
16989 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16991 struct attribute *type_attr;
16993 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
16997 return lookup_die_type (die, type_attr, cu);
17000 /* If DIE has a descriptive_type attribute, then set the TYPE's
17001 descriptive type accordingly. */
17004 set_descriptive_type (struct type *type, struct die_info *die,
17005 struct dwarf2_cu *cu)
17007 struct type *descriptive_type = die_descriptive_type (die, cu);
17009 if (descriptive_type)
17011 ALLOCATE_GNAT_AUX_TYPE (type);
17012 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
17016 /* Return the containing type of the die in question using its
17017 DW_AT_containing_type attribute. */
17019 static struct type *
17020 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
17022 struct attribute *type_attr;
17024 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
17026 error (_("Dwarf Error: Problem turning containing type into gdb type "
17027 "[in module %s]"), cu->objfile->name);
17029 return lookup_die_type (die, type_attr, cu);
17032 /* Return an error marker type to use for the ill formed type in DIE/CU. */
17034 static struct type *
17035 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
17037 struct objfile *objfile = dwarf2_per_objfile->objfile;
17038 char *message, *saved;
17040 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
17042 cu->header.offset.sect_off,
17043 die->offset.sect_off);
17044 saved = obstack_copy0 (&objfile->objfile_obstack,
17045 message, strlen (message));
17048 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
17051 /* Look up the type of DIE in CU using its type attribute ATTR.
17052 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
17053 DW_AT_containing_type.
17054 If there is no type substitute an error marker. */
17056 static struct type *
17057 lookup_die_type (struct die_info *die, struct attribute *attr,
17058 struct dwarf2_cu *cu)
17060 struct objfile *objfile = cu->objfile;
17061 struct type *this_type;
17063 gdb_assert (attr->name == DW_AT_type
17064 || attr->name == DW_AT_GNAT_descriptive_type
17065 || attr->name == DW_AT_containing_type);
17067 /* First see if we have it cached. */
17069 if (attr->form == DW_FORM_GNU_ref_alt)
17071 struct dwarf2_per_cu_data *per_cu;
17072 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17074 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
17075 this_type = get_die_type_at_offset (offset, per_cu);
17077 else if (is_ref_attr (attr))
17079 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17081 this_type = get_die_type_at_offset (offset, cu->per_cu);
17083 else if (attr->form == DW_FORM_ref_sig8)
17085 ULONGEST signature = DW_SIGNATURE (attr);
17087 return get_signatured_type (die, signature, cu);
17091 complaint (&symfile_complaints,
17092 _("Dwarf Error: Bad type attribute %s in DIE"
17093 " at 0x%x [in module %s]"),
17094 dwarf_attr_name (attr->name), die->offset.sect_off,
17096 return build_error_marker_type (cu, die);
17099 /* If not cached we need to read it in. */
17101 if (this_type == NULL)
17103 struct die_info *type_die = NULL;
17104 struct dwarf2_cu *type_cu = cu;
17106 if (is_ref_attr (attr))
17107 type_die = follow_die_ref (die, attr, &type_cu);
17108 if (type_die == NULL)
17109 return build_error_marker_type (cu, die);
17110 /* If we find the type now, it's probably because the type came
17111 from an inter-CU reference and the type's CU got expanded before
17113 this_type = read_type_die (type_die, type_cu);
17116 /* If we still don't have a type use an error marker. */
17118 if (this_type == NULL)
17119 return build_error_marker_type (cu, die);
17124 /* Return the type in DIE, CU.
17125 Returns NULL for invalid types.
17127 This first does a lookup in die_type_hash,
17128 and only reads the die in if necessary.
17130 NOTE: This can be called when reading in partial or full symbols. */
17132 static struct type *
17133 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
17135 struct type *this_type;
17137 this_type = get_die_type (die, cu);
17141 return read_type_die_1 (die, cu);
17144 /* Read the type in DIE, CU.
17145 Returns NULL for invalid types. */
17147 static struct type *
17148 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
17150 struct type *this_type = NULL;
17154 case DW_TAG_class_type:
17155 case DW_TAG_interface_type:
17156 case DW_TAG_structure_type:
17157 case DW_TAG_union_type:
17158 this_type = read_structure_type (die, cu);
17160 case DW_TAG_enumeration_type:
17161 this_type = read_enumeration_type (die, cu);
17163 case DW_TAG_subprogram:
17164 case DW_TAG_subroutine_type:
17165 case DW_TAG_inlined_subroutine:
17166 this_type = read_subroutine_type (die, cu);
17168 case DW_TAG_array_type:
17169 this_type = read_array_type (die, cu);
17171 case DW_TAG_set_type:
17172 this_type = read_set_type (die, cu);
17174 case DW_TAG_pointer_type:
17175 this_type = read_tag_pointer_type (die, cu);
17177 case DW_TAG_ptr_to_member_type:
17178 this_type = read_tag_ptr_to_member_type (die, cu);
17180 case DW_TAG_reference_type:
17181 this_type = read_tag_reference_type (die, cu);
17183 case DW_TAG_const_type:
17184 this_type = read_tag_const_type (die, cu);
17186 case DW_TAG_volatile_type:
17187 this_type = read_tag_volatile_type (die, cu);
17189 case DW_TAG_restrict_type:
17190 this_type = read_tag_restrict_type (die, cu);
17192 case DW_TAG_string_type:
17193 this_type = read_tag_string_type (die, cu);
17195 case DW_TAG_typedef:
17196 this_type = read_typedef (die, cu);
17198 case DW_TAG_subrange_type:
17199 this_type = read_subrange_type (die, cu);
17201 case DW_TAG_base_type:
17202 this_type = read_base_type (die, cu);
17204 case DW_TAG_unspecified_type:
17205 this_type = read_unspecified_type (die, cu);
17207 case DW_TAG_namespace:
17208 this_type = read_namespace_type (die, cu);
17210 case DW_TAG_module:
17211 this_type = read_module_type (die, cu);
17214 complaint (&symfile_complaints,
17215 _("unexpected tag in read_type_die: '%s'"),
17216 dwarf_tag_name (die->tag));
17223 /* See if we can figure out if the class lives in a namespace. We do
17224 this by looking for a member function; its demangled name will
17225 contain namespace info, if there is any.
17226 Return the computed name or NULL.
17227 Space for the result is allocated on the objfile's obstack.
17228 This is the full-die version of guess_partial_die_structure_name.
17229 In this case we know DIE has no useful parent. */
17232 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
17234 struct die_info *spec_die;
17235 struct dwarf2_cu *spec_cu;
17236 struct die_info *child;
17239 spec_die = die_specification (die, &spec_cu);
17240 if (spec_die != NULL)
17246 for (child = die->child;
17248 child = child->sibling)
17250 if (child->tag == DW_TAG_subprogram)
17252 struct attribute *attr;
17254 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
17256 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
17260 = language_class_name_from_physname (cu->language_defn,
17264 if (actual_name != NULL)
17266 const char *die_name = dwarf2_name (die, cu);
17268 if (die_name != NULL
17269 && strcmp (die_name, actual_name) != 0)
17271 /* Strip off the class name from the full name.
17272 We want the prefix. */
17273 int die_name_len = strlen (die_name);
17274 int actual_name_len = strlen (actual_name);
17276 /* Test for '::' as a sanity check. */
17277 if (actual_name_len > die_name_len + 2
17278 && actual_name[actual_name_len
17279 - die_name_len - 1] == ':')
17281 obstack_copy0 (&cu->objfile->objfile_obstack,
17283 actual_name_len - die_name_len - 2);
17286 xfree (actual_name);
17295 /* GCC might emit a nameless typedef that has a linkage name. Determine the
17296 prefix part in such case. See
17297 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17300 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
17302 struct attribute *attr;
17305 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
17306 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
17309 attr = dwarf2_attr (die, DW_AT_name, cu);
17310 if (attr != NULL && DW_STRING (attr) != NULL)
17313 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17315 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17316 if (attr == NULL || DW_STRING (attr) == NULL)
17319 /* dwarf2_name had to be already called. */
17320 gdb_assert (DW_STRING_IS_CANONICAL (attr));
17322 /* Strip the base name, keep any leading namespaces/classes. */
17323 base = strrchr (DW_STRING (attr), ':');
17324 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
17327 return obstack_copy0 (&cu->objfile->objfile_obstack,
17328 DW_STRING (attr), &base[-1] - DW_STRING (attr));
17331 /* Return the name of the namespace/class that DIE is defined within,
17332 or "" if we can't tell. The caller should not xfree the result.
17334 For example, if we're within the method foo() in the following
17344 then determine_prefix on foo's die will return "N::C". */
17346 static const char *
17347 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
17349 struct die_info *parent, *spec_die;
17350 struct dwarf2_cu *spec_cu;
17351 struct type *parent_type;
17354 if (cu->language != language_cplus && cu->language != language_java
17355 && cu->language != language_fortran)
17358 retval = anonymous_struct_prefix (die, cu);
17362 /* We have to be careful in the presence of DW_AT_specification.
17363 For example, with GCC 3.4, given the code
17367 // Definition of N::foo.
17371 then we'll have a tree of DIEs like this:
17373 1: DW_TAG_compile_unit
17374 2: DW_TAG_namespace // N
17375 3: DW_TAG_subprogram // declaration of N::foo
17376 4: DW_TAG_subprogram // definition of N::foo
17377 DW_AT_specification // refers to die #3
17379 Thus, when processing die #4, we have to pretend that we're in
17380 the context of its DW_AT_specification, namely the contex of die
17383 spec_die = die_specification (die, &spec_cu);
17384 if (spec_die == NULL)
17385 parent = die->parent;
17388 parent = spec_die->parent;
17392 if (parent == NULL)
17394 else if (parent->building_fullname)
17397 const char *parent_name;
17399 /* It has been seen on RealView 2.2 built binaries,
17400 DW_TAG_template_type_param types actually _defined_ as
17401 children of the parent class:
17404 template class <class Enum> Class{};
17405 Class<enum E> class_e;
17407 1: DW_TAG_class_type (Class)
17408 2: DW_TAG_enumeration_type (E)
17409 3: DW_TAG_enumerator (enum1:0)
17410 3: DW_TAG_enumerator (enum2:1)
17412 2: DW_TAG_template_type_param
17413 DW_AT_type DW_FORM_ref_udata (E)
17415 Besides being broken debug info, it can put GDB into an
17416 infinite loop. Consider:
17418 When we're building the full name for Class<E>, we'll start
17419 at Class, and go look over its template type parameters,
17420 finding E. We'll then try to build the full name of E, and
17421 reach here. We're now trying to build the full name of E,
17422 and look over the parent DIE for containing scope. In the
17423 broken case, if we followed the parent DIE of E, we'd again
17424 find Class, and once again go look at its template type
17425 arguments, etc., etc. Simply don't consider such parent die
17426 as source-level parent of this die (it can't be, the language
17427 doesn't allow it), and break the loop here. */
17428 name = dwarf2_name (die, cu);
17429 parent_name = dwarf2_name (parent, cu);
17430 complaint (&symfile_complaints,
17431 _("template param type '%s' defined within parent '%s'"),
17432 name ? name : "<unknown>",
17433 parent_name ? parent_name : "<unknown>");
17437 switch (parent->tag)
17439 case DW_TAG_namespace:
17440 parent_type = read_type_die (parent, cu);
17441 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17442 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17443 Work around this problem here. */
17444 if (cu->language == language_cplus
17445 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17447 /* We give a name to even anonymous namespaces. */
17448 return TYPE_TAG_NAME (parent_type);
17449 case DW_TAG_class_type:
17450 case DW_TAG_interface_type:
17451 case DW_TAG_structure_type:
17452 case DW_TAG_union_type:
17453 case DW_TAG_module:
17454 parent_type = read_type_die (parent, cu);
17455 if (TYPE_TAG_NAME (parent_type) != NULL)
17456 return TYPE_TAG_NAME (parent_type);
17458 /* An anonymous structure is only allowed non-static data
17459 members; no typedefs, no member functions, et cetera.
17460 So it does not need a prefix. */
17462 case DW_TAG_compile_unit:
17463 case DW_TAG_partial_unit:
17464 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17465 if (cu->language == language_cplus
17466 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17467 && die->child != NULL
17468 && (die->tag == DW_TAG_class_type
17469 || die->tag == DW_TAG_structure_type
17470 || die->tag == DW_TAG_union_type))
17472 char *name = guess_full_die_structure_name (die, cu);
17478 return determine_prefix (parent, cu);
17482 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17483 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17484 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17485 an obconcat, otherwise allocate storage for the result. The CU argument is
17486 used to determine the language and hence, the appropriate separator. */
17488 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17491 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17492 int physname, struct dwarf2_cu *cu)
17494 const char *lead = "";
17497 if (suffix == NULL || suffix[0] == '\0'
17498 || prefix == NULL || prefix[0] == '\0')
17500 else if (cu->language == language_java)
17502 else if (cu->language == language_fortran && physname)
17504 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17505 DW_AT_MIPS_linkage_name is preferred and used instead. */
17513 if (prefix == NULL)
17515 if (suffix == NULL)
17521 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17523 strcpy (retval, lead);
17524 strcat (retval, prefix);
17525 strcat (retval, sep);
17526 strcat (retval, suffix);
17531 /* We have an obstack. */
17532 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17536 /* Return sibling of die, NULL if no sibling. */
17538 static struct die_info *
17539 sibling_die (struct die_info *die)
17541 return die->sibling;
17544 /* Get name of a die, return NULL if not found. */
17546 static const char *
17547 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17548 struct obstack *obstack)
17550 if (name && cu->language == language_cplus)
17552 char *canon_name = cp_canonicalize_string (name);
17554 if (canon_name != NULL)
17556 if (strcmp (canon_name, name) != 0)
17557 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17558 xfree (canon_name);
17565 /* Get name of a die, return NULL if not found. */
17567 static const char *
17568 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17570 struct attribute *attr;
17572 attr = dwarf2_attr (die, DW_AT_name, cu);
17573 if ((!attr || !DW_STRING (attr))
17574 && die->tag != DW_TAG_class_type
17575 && die->tag != DW_TAG_interface_type
17576 && die->tag != DW_TAG_structure_type
17577 && die->tag != DW_TAG_union_type)
17582 case DW_TAG_compile_unit:
17583 case DW_TAG_partial_unit:
17584 /* Compilation units have a DW_AT_name that is a filename, not
17585 a source language identifier. */
17586 case DW_TAG_enumeration_type:
17587 case DW_TAG_enumerator:
17588 /* These tags always have simple identifiers already; no need
17589 to canonicalize them. */
17590 return DW_STRING (attr);
17592 case DW_TAG_subprogram:
17593 /* Java constructors will all be named "<init>", so return
17594 the class name when we see this special case. */
17595 if (cu->language == language_java
17596 && DW_STRING (attr) != NULL
17597 && strcmp (DW_STRING (attr), "<init>") == 0)
17599 struct dwarf2_cu *spec_cu = cu;
17600 struct die_info *spec_die;
17602 /* GCJ will output '<init>' for Java constructor names.
17603 For this special case, return the name of the parent class. */
17605 /* GCJ may output suprogram DIEs with AT_specification set.
17606 If so, use the name of the specified DIE. */
17607 spec_die = die_specification (die, &spec_cu);
17608 if (spec_die != NULL)
17609 return dwarf2_name (spec_die, spec_cu);
17614 if (die->tag == DW_TAG_class_type)
17615 return dwarf2_name (die, cu);
17617 while (die->tag != DW_TAG_compile_unit
17618 && die->tag != DW_TAG_partial_unit);
17622 case DW_TAG_class_type:
17623 case DW_TAG_interface_type:
17624 case DW_TAG_structure_type:
17625 case DW_TAG_union_type:
17626 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17627 structures or unions. These were of the form "._%d" in GCC 4.1,
17628 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17629 and GCC 4.4. We work around this problem by ignoring these. */
17630 if (attr && DW_STRING (attr)
17631 && (strncmp (DW_STRING (attr), "._", 2) == 0
17632 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17635 /* GCC might emit a nameless typedef that has a linkage name. See
17636 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17637 if (!attr || DW_STRING (attr) == NULL)
17639 char *demangled = NULL;
17641 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17643 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17645 if (attr == NULL || DW_STRING (attr) == NULL)
17648 /* Avoid demangling DW_STRING (attr) the second time on a second
17649 call for the same DIE. */
17650 if (!DW_STRING_IS_CANONICAL (attr))
17651 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17657 /* FIXME: we already did this for the partial symbol... */
17658 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17659 demangled, strlen (demangled));
17660 DW_STRING_IS_CANONICAL (attr) = 1;
17663 /* Strip any leading namespaces/classes, keep only the base name.
17664 DW_AT_name for named DIEs does not contain the prefixes. */
17665 base = strrchr (DW_STRING (attr), ':');
17666 if (base && base > DW_STRING (attr) && base[-1] == ':')
17669 return DW_STRING (attr);
17678 if (!DW_STRING_IS_CANONICAL (attr))
17681 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17682 &cu->objfile->objfile_obstack);
17683 DW_STRING_IS_CANONICAL (attr) = 1;
17685 return DW_STRING (attr);
17688 /* Return the die that this die in an extension of, or NULL if there
17689 is none. *EXT_CU is the CU containing DIE on input, and the CU
17690 containing the return value on output. */
17692 static struct die_info *
17693 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17695 struct attribute *attr;
17697 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17701 return follow_die_ref (die, attr, ext_cu);
17704 /* Convert a DIE tag into its string name. */
17706 static const char *
17707 dwarf_tag_name (unsigned tag)
17709 const char *name = get_DW_TAG_name (tag);
17712 return "DW_TAG_<unknown>";
17717 /* Convert a DWARF attribute code into its string name. */
17719 static const char *
17720 dwarf_attr_name (unsigned attr)
17724 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17725 if (attr == DW_AT_MIPS_fde)
17726 return "DW_AT_MIPS_fde";
17728 if (attr == DW_AT_HP_block_index)
17729 return "DW_AT_HP_block_index";
17732 name = get_DW_AT_name (attr);
17735 return "DW_AT_<unknown>";
17740 /* Convert a DWARF value form code into its string name. */
17742 static const char *
17743 dwarf_form_name (unsigned form)
17745 const char *name = get_DW_FORM_name (form);
17748 return "DW_FORM_<unknown>";
17754 dwarf_bool_name (unsigned mybool)
17762 /* Convert a DWARF type code into its string name. */
17764 static const char *
17765 dwarf_type_encoding_name (unsigned enc)
17767 const char *name = get_DW_ATE_name (enc);
17770 return "DW_ATE_<unknown>";
17776 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17780 print_spaces (indent, f);
17781 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17782 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17784 if (die->parent != NULL)
17786 print_spaces (indent, f);
17787 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17788 die->parent->offset.sect_off);
17791 print_spaces (indent, f);
17792 fprintf_unfiltered (f, " has children: %s\n",
17793 dwarf_bool_name (die->child != NULL));
17795 print_spaces (indent, f);
17796 fprintf_unfiltered (f, " attributes:\n");
17798 for (i = 0; i < die->num_attrs; ++i)
17800 print_spaces (indent, f);
17801 fprintf_unfiltered (f, " %s (%s) ",
17802 dwarf_attr_name (die->attrs[i].name),
17803 dwarf_form_name (die->attrs[i].form));
17805 switch (die->attrs[i].form)
17808 case DW_FORM_GNU_addr_index:
17809 fprintf_unfiltered (f, "address: ");
17810 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17812 case DW_FORM_block2:
17813 case DW_FORM_block4:
17814 case DW_FORM_block:
17815 case DW_FORM_block1:
17816 fprintf_unfiltered (f, "block: size %s",
17817 pulongest (DW_BLOCK (&die->attrs[i])->size));
17819 case DW_FORM_exprloc:
17820 fprintf_unfiltered (f, "expression: size %s",
17821 pulongest (DW_BLOCK (&die->attrs[i])->size));
17823 case DW_FORM_ref_addr:
17824 fprintf_unfiltered (f, "ref address: ");
17825 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17827 case DW_FORM_GNU_ref_alt:
17828 fprintf_unfiltered (f, "alt ref address: ");
17829 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17835 case DW_FORM_ref_udata:
17836 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17837 (long) (DW_UNSND (&die->attrs[i])));
17839 case DW_FORM_data1:
17840 case DW_FORM_data2:
17841 case DW_FORM_data4:
17842 case DW_FORM_data8:
17843 case DW_FORM_udata:
17844 case DW_FORM_sdata:
17845 fprintf_unfiltered (f, "constant: %s",
17846 pulongest (DW_UNSND (&die->attrs[i])));
17848 case DW_FORM_sec_offset:
17849 fprintf_unfiltered (f, "section offset: %s",
17850 pulongest (DW_UNSND (&die->attrs[i])));
17852 case DW_FORM_ref_sig8:
17853 fprintf_unfiltered (f, "signature: %s",
17854 hex_string (DW_SIGNATURE (&die->attrs[i])));
17856 case DW_FORM_string:
17858 case DW_FORM_GNU_str_index:
17859 case DW_FORM_GNU_strp_alt:
17860 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17861 DW_STRING (&die->attrs[i])
17862 ? DW_STRING (&die->attrs[i]) : "",
17863 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17866 if (DW_UNSND (&die->attrs[i]))
17867 fprintf_unfiltered (f, "flag: TRUE");
17869 fprintf_unfiltered (f, "flag: FALSE");
17871 case DW_FORM_flag_present:
17872 fprintf_unfiltered (f, "flag: TRUE");
17874 case DW_FORM_indirect:
17875 /* The reader will have reduced the indirect form to
17876 the "base form" so this form should not occur. */
17877 fprintf_unfiltered (f,
17878 "unexpected attribute form: DW_FORM_indirect");
17881 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17882 die->attrs[i].form);
17885 fprintf_unfiltered (f, "\n");
17890 dump_die_for_error (struct die_info *die)
17892 dump_die_shallow (gdb_stderr, 0, die);
17896 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17898 int indent = level * 4;
17900 gdb_assert (die != NULL);
17902 if (level >= max_level)
17905 dump_die_shallow (f, indent, die);
17907 if (die->child != NULL)
17909 print_spaces (indent, f);
17910 fprintf_unfiltered (f, " Children:");
17911 if (level + 1 < max_level)
17913 fprintf_unfiltered (f, "\n");
17914 dump_die_1 (f, level + 1, max_level, die->child);
17918 fprintf_unfiltered (f,
17919 " [not printed, max nesting level reached]\n");
17923 if (die->sibling != NULL && level > 0)
17925 dump_die_1 (f, level, max_level, die->sibling);
17929 /* This is called from the pdie macro in gdbinit.in.
17930 It's not static so gcc will keep a copy callable from gdb. */
17933 dump_die (struct die_info *die, int max_level)
17935 dump_die_1 (gdb_stdlog, 0, max_level, die);
17939 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17943 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17949 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17950 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17953 is_ref_attr (struct attribute *attr)
17955 switch (attr->form)
17957 case DW_FORM_ref_addr:
17962 case DW_FORM_ref_udata:
17963 case DW_FORM_GNU_ref_alt:
17970 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17974 dwarf2_get_ref_die_offset (struct attribute *attr)
17976 sect_offset retval = { DW_UNSND (attr) };
17978 if (is_ref_attr (attr))
17981 retval.sect_off = 0;
17982 complaint (&symfile_complaints,
17983 _("unsupported die ref attribute form: '%s'"),
17984 dwarf_form_name (attr->form));
17988 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17989 * the value held by the attribute is not constant. */
17992 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17994 if (attr->form == DW_FORM_sdata)
17995 return DW_SND (attr);
17996 else if (attr->form == DW_FORM_udata
17997 || attr->form == DW_FORM_data1
17998 || attr->form == DW_FORM_data2
17999 || attr->form == DW_FORM_data4
18000 || attr->form == DW_FORM_data8)
18001 return DW_UNSND (attr);
18004 complaint (&symfile_complaints,
18005 _("Attribute value is not a constant (%s)"),
18006 dwarf_form_name (attr->form));
18007 return default_value;
18011 /* Follow reference or signature attribute ATTR of SRC_DIE.
18012 On entry *REF_CU is the CU of SRC_DIE.
18013 On exit *REF_CU is the CU of the result. */
18015 static struct die_info *
18016 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
18017 struct dwarf2_cu **ref_cu)
18019 struct die_info *die;
18021 if (is_ref_attr (attr))
18022 die = follow_die_ref (src_die, attr, ref_cu);
18023 else if (attr->form == DW_FORM_ref_sig8)
18024 die = follow_die_sig (src_die, attr, ref_cu);
18027 dump_die_for_error (src_die);
18028 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
18029 (*ref_cu)->objfile->name);
18035 /* Follow reference OFFSET.
18036 On entry *REF_CU is the CU of the source die referencing OFFSET.
18037 On exit *REF_CU is the CU of the result.
18038 Returns NULL if OFFSET is invalid. */
18040 static struct die_info *
18041 follow_die_offset (sect_offset offset, int offset_in_dwz,
18042 struct dwarf2_cu **ref_cu)
18044 struct die_info temp_die;
18045 struct dwarf2_cu *target_cu, *cu = *ref_cu;
18047 gdb_assert (cu->per_cu != NULL);
18051 if (cu->per_cu->is_debug_types)
18053 /* .debug_types CUs cannot reference anything outside their CU.
18054 If they need to, they have to reference a signatured type via
18055 DW_FORM_ref_sig8. */
18056 if (! offset_in_cu_p (&cu->header, offset))
18059 else if (offset_in_dwz != cu->per_cu->is_dwz
18060 || ! offset_in_cu_p (&cu->header, offset))
18062 struct dwarf2_per_cu_data *per_cu;
18064 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
18067 /* If necessary, add it to the queue and load its DIEs. */
18068 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
18069 load_full_comp_unit (per_cu, cu->language);
18071 target_cu = per_cu->cu;
18073 else if (cu->dies == NULL)
18075 /* We're loading full DIEs during partial symbol reading. */
18076 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
18077 load_full_comp_unit (cu->per_cu, language_minimal);
18080 *ref_cu = target_cu;
18081 temp_die.offset = offset;
18082 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
18085 /* Follow reference attribute ATTR of SRC_DIE.
18086 On entry *REF_CU is the CU of SRC_DIE.
18087 On exit *REF_CU is the CU of the result. */
18089 static struct die_info *
18090 follow_die_ref (struct die_info *src_die, struct attribute *attr,
18091 struct dwarf2_cu **ref_cu)
18093 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18094 struct dwarf2_cu *cu = *ref_cu;
18095 struct die_info *die;
18097 die = follow_die_offset (offset,
18098 (attr->form == DW_FORM_GNU_ref_alt
18099 || cu->per_cu->is_dwz),
18102 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
18103 "at 0x%x [in module %s]"),
18104 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
18109 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
18110 Returned value is intended for DW_OP_call*. Returned
18111 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
18113 struct dwarf2_locexpr_baton
18114 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
18115 struct dwarf2_per_cu_data *per_cu,
18116 CORE_ADDR (*get_frame_pc) (void *baton),
18119 struct dwarf2_cu *cu;
18120 struct die_info *die;
18121 struct attribute *attr;
18122 struct dwarf2_locexpr_baton retval;
18124 dw2_setup (per_cu->objfile);
18126 if (per_cu->cu == NULL)
18130 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18132 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18133 offset.sect_off, per_cu->objfile->name);
18135 attr = dwarf2_attr (die, DW_AT_location, cu);
18138 /* DWARF: "If there is no such attribute, then there is no effect.".
18139 DATA is ignored if SIZE is 0. */
18141 retval.data = NULL;
18144 else if (attr_form_is_section_offset (attr))
18146 struct dwarf2_loclist_baton loclist_baton;
18147 CORE_ADDR pc = (*get_frame_pc) (baton);
18150 fill_in_loclist_baton (cu, &loclist_baton, attr);
18152 retval.data = dwarf2_find_location_expression (&loclist_baton,
18154 retval.size = size;
18158 if (!attr_form_is_block (attr))
18159 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
18160 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
18161 offset.sect_off, per_cu->objfile->name);
18163 retval.data = DW_BLOCK (attr)->data;
18164 retval.size = DW_BLOCK (attr)->size;
18166 retval.per_cu = cu->per_cu;
18168 age_cached_comp_units ();
18173 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
18176 struct dwarf2_locexpr_baton
18177 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
18178 struct dwarf2_per_cu_data *per_cu,
18179 CORE_ADDR (*get_frame_pc) (void *baton),
18182 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
18184 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
18187 /* Write a constant of a given type as target-ordered bytes into
18190 static const gdb_byte *
18191 write_constant_as_bytes (struct obstack *obstack,
18192 enum bfd_endian byte_order,
18199 *len = TYPE_LENGTH (type);
18200 result = obstack_alloc (obstack, *len);
18201 store_unsigned_integer (result, *len, byte_order, value);
18206 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
18207 pointer to the constant bytes and set LEN to the length of the
18208 data. If memory is needed, allocate it on OBSTACK. If the DIE
18209 does not have a DW_AT_const_value, return NULL. */
18212 dwarf2_fetch_constant_bytes (sect_offset offset,
18213 struct dwarf2_per_cu_data *per_cu,
18214 struct obstack *obstack,
18217 struct dwarf2_cu *cu;
18218 struct die_info *die;
18219 struct attribute *attr;
18220 const gdb_byte *result = NULL;
18223 enum bfd_endian byte_order;
18225 dw2_setup (per_cu->objfile);
18227 if (per_cu->cu == NULL)
18231 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18233 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18234 offset.sect_off, per_cu->objfile->name);
18237 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18241 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
18242 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18244 switch (attr->form)
18247 case DW_FORM_GNU_addr_index:
18251 *len = cu->header.addr_size;
18252 tem = obstack_alloc (obstack, *len);
18253 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
18257 case DW_FORM_string:
18259 case DW_FORM_GNU_str_index:
18260 case DW_FORM_GNU_strp_alt:
18261 /* DW_STRING is already allocated on the objfile obstack, point
18263 result = (const gdb_byte *) DW_STRING (attr);
18264 *len = strlen (DW_STRING (attr));
18266 case DW_FORM_block1:
18267 case DW_FORM_block2:
18268 case DW_FORM_block4:
18269 case DW_FORM_block:
18270 case DW_FORM_exprloc:
18271 result = DW_BLOCK (attr)->data;
18272 *len = DW_BLOCK (attr)->size;
18275 /* The DW_AT_const_value attributes are supposed to carry the
18276 symbol's value "represented as it would be on the target
18277 architecture." By the time we get here, it's already been
18278 converted to host endianness, so we just need to sign- or
18279 zero-extend it as appropriate. */
18280 case DW_FORM_data1:
18281 type = die_type (die, cu);
18282 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
18283 if (result == NULL)
18284 result = write_constant_as_bytes (obstack, byte_order,
18287 case DW_FORM_data2:
18288 type = die_type (die, cu);
18289 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
18290 if (result == NULL)
18291 result = write_constant_as_bytes (obstack, byte_order,
18294 case DW_FORM_data4:
18295 type = die_type (die, cu);
18296 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
18297 if (result == NULL)
18298 result = write_constant_as_bytes (obstack, byte_order,
18301 case DW_FORM_data8:
18302 type = die_type (die, cu);
18303 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
18304 if (result == NULL)
18305 result = write_constant_as_bytes (obstack, byte_order,
18309 case DW_FORM_sdata:
18310 type = die_type (die, cu);
18311 result = write_constant_as_bytes (obstack, byte_order,
18312 type, DW_SND (attr), len);
18315 case DW_FORM_udata:
18316 type = die_type (die, cu);
18317 result = write_constant_as_bytes (obstack, byte_order,
18318 type, DW_UNSND (attr), len);
18322 complaint (&symfile_complaints,
18323 _("unsupported const value attribute form: '%s'"),
18324 dwarf_form_name (attr->form));
18331 /* Return the type of the DIE at DIE_OFFSET in the CU named by
18335 dwarf2_get_die_type (cu_offset die_offset,
18336 struct dwarf2_per_cu_data *per_cu)
18338 sect_offset die_offset_sect;
18340 dw2_setup (per_cu->objfile);
18342 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
18343 return get_die_type_at_offset (die_offset_sect, per_cu);
18346 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
18347 On entry *REF_CU is the CU of SRC_DIE.
18348 On exit *REF_CU is the CU of the result.
18349 Returns NULL if the referenced DIE isn't found. */
18351 static struct die_info *
18352 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
18353 struct dwarf2_cu **ref_cu)
18355 struct objfile *objfile = (*ref_cu)->objfile;
18356 struct die_info temp_die;
18357 struct dwarf2_cu *sig_cu;
18358 struct die_info *die;
18360 /* While it might be nice to assert sig_type->type == NULL here,
18361 we can get here for DW_AT_imported_declaration where we need
18362 the DIE not the type. */
18364 /* If necessary, add it to the queue and load its DIEs. */
18366 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
18367 read_signatured_type (sig_type);
18369 gdb_assert (sig_type->per_cu.cu != NULL);
18371 sig_cu = sig_type->per_cu.cu;
18372 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
18373 temp_die.offset = sig_type->type_offset_in_section;
18374 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
18375 temp_die.offset.sect_off);
18378 /* For .gdb_index version 7 keep track of included TUs.
18379 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
18380 if (dwarf2_per_objfile->index_table != NULL
18381 && dwarf2_per_objfile->index_table->version <= 7)
18383 VEC_safe_push (dwarf2_per_cu_ptr,
18384 (*ref_cu)->per_cu->imported_symtabs,
18395 /* Follow signatured type referenced by ATTR in SRC_DIE.
18396 On entry *REF_CU is the CU of SRC_DIE.
18397 On exit *REF_CU is the CU of the result.
18398 The result is the DIE of the type.
18399 If the referenced type cannot be found an error is thrown. */
18401 static struct die_info *
18402 follow_die_sig (struct die_info *src_die, struct attribute *attr,
18403 struct dwarf2_cu **ref_cu)
18405 ULONGEST signature = DW_SIGNATURE (attr);
18406 struct signatured_type *sig_type;
18407 struct die_info *die;
18409 gdb_assert (attr->form == DW_FORM_ref_sig8);
18411 sig_type = lookup_signatured_type (*ref_cu, signature);
18412 /* sig_type will be NULL if the signatured type is missing from
18414 if (sig_type == NULL)
18416 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
18417 " from DIE at 0x%x [in module %s]"),
18418 hex_string (signature), src_die->offset.sect_off,
18419 (*ref_cu)->objfile->name);
18422 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
18425 dump_die_for_error (src_die);
18426 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
18427 " from DIE at 0x%x [in module %s]"),
18428 hex_string (signature), src_die->offset.sect_off,
18429 (*ref_cu)->objfile->name);
18435 /* Get the type specified by SIGNATURE referenced in DIE/CU,
18436 reading in and processing the type unit if necessary. */
18438 static struct type *
18439 get_signatured_type (struct die_info *die, ULONGEST signature,
18440 struct dwarf2_cu *cu)
18442 struct signatured_type *sig_type;
18443 struct dwarf2_cu *type_cu;
18444 struct die_info *type_die;
18447 sig_type = lookup_signatured_type (cu, signature);
18448 /* sig_type will be NULL if the signatured type is missing from
18450 if (sig_type == NULL)
18452 complaint (&symfile_complaints,
18453 _("Dwarf Error: Cannot find signatured DIE %s referenced"
18454 " from DIE at 0x%x [in module %s]"),
18455 hex_string (signature), die->offset.sect_off,
18456 dwarf2_per_objfile->objfile->name);
18457 return build_error_marker_type (cu, die);
18460 /* If we already know the type we're done. */
18461 if (sig_type->type != NULL)
18462 return sig_type->type;
18465 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
18466 if (type_die != NULL)
18468 /* N.B. We need to call get_die_type to ensure only one type for this DIE
18469 is created. This is important, for example, because for c++ classes
18470 we need TYPE_NAME set which is only done by new_symbol. Blech. */
18471 type = read_type_die (type_die, type_cu);
18474 complaint (&symfile_complaints,
18475 _("Dwarf Error: Cannot build signatured type %s"
18476 " referenced from DIE at 0x%x [in module %s]"),
18477 hex_string (signature), die->offset.sect_off,
18478 dwarf2_per_objfile->objfile->name);
18479 type = build_error_marker_type (cu, die);
18484 complaint (&symfile_complaints,
18485 _("Dwarf Error: Problem reading signatured DIE %s referenced"
18486 " from DIE at 0x%x [in module %s]"),
18487 hex_string (signature), die->offset.sect_off,
18488 dwarf2_per_objfile->objfile->name);
18489 type = build_error_marker_type (cu, die);
18491 sig_type->type = type;
18496 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
18497 reading in and processing the type unit if necessary. */
18499 static struct type *
18500 get_DW_AT_signature_type (struct die_info *die, struct attribute *attr,
18501 struct dwarf2_cu *cu) /* ARI: editCase function */
18503 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
18504 if (is_ref_attr (attr))
18506 struct dwarf2_cu *type_cu = cu;
18507 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
18509 return read_type_die (type_die, type_cu);
18511 else if (attr->form == DW_FORM_ref_sig8)
18513 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
18517 complaint (&symfile_complaints,
18518 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
18519 " at 0x%x [in module %s]"),
18520 dwarf_form_name (attr->form), die->offset.sect_off,
18521 dwarf2_per_objfile->objfile->name);
18522 return build_error_marker_type (cu, die);
18526 /* Load the DIEs associated with type unit PER_CU into memory. */
18529 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
18531 struct signatured_type *sig_type;
18533 /* Caller is responsible for ensuring type_unit_groups don't get here. */
18534 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
18536 /* We have the per_cu, but we need the signatured_type.
18537 Fortunately this is an easy translation. */
18538 gdb_assert (per_cu->is_debug_types);
18539 sig_type = (struct signatured_type *) per_cu;
18541 gdb_assert (per_cu->cu == NULL);
18543 read_signatured_type (sig_type);
18545 gdb_assert (per_cu->cu != NULL);
18548 /* die_reader_func for read_signatured_type.
18549 This is identical to load_full_comp_unit_reader,
18550 but is kept separate for now. */
18553 read_signatured_type_reader (const struct die_reader_specs *reader,
18554 const gdb_byte *info_ptr,
18555 struct die_info *comp_unit_die,
18559 struct dwarf2_cu *cu = reader->cu;
18561 gdb_assert (cu->die_hash == NULL);
18563 htab_create_alloc_ex (cu->header.length / 12,
18567 &cu->comp_unit_obstack,
18568 hashtab_obstack_allocate,
18569 dummy_obstack_deallocate);
18572 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18573 &info_ptr, comp_unit_die);
18574 cu->dies = comp_unit_die;
18575 /* comp_unit_die is not stored in die_hash, no need. */
18577 /* We try not to read any attributes in this function, because not
18578 all CUs needed for references have been loaded yet, and symbol
18579 table processing isn't initialized. But we have to set the CU language,
18580 or we won't be able to build types correctly.
18581 Similarly, if we do not read the producer, we can not apply
18582 producer-specific interpretation. */
18583 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18586 /* Read in a signatured type and build its CU and DIEs.
18587 If the type is a stub for the real type in a DWO file,
18588 read in the real type from the DWO file as well. */
18591 read_signatured_type (struct signatured_type *sig_type)
18593 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18595 gdb_assert (per_cu->is_debug_types);
18596 gdb_assert (per_cu->cu == NULL);
18598 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18599 read_signatured_type_reader, NULL);
18602 /* Decode simple location descriptions.
18603 Given a pointer to a dwarf block that defines a location, compute
18604 the location and return the value.
18606 NOTE drow/2003-11-18: This function is called in two situations
18607 now: for the address of static or global variables (partial symbols
18608 only) and for offsets into structures which are expected to be
18609 (more or less) constant. The partial symbol case should go away,
18610 and only the constant case should remain. That will let this
18611 function complain more accurately. A few special modes are allowed
18612 without complaint for global variables (for instance, global
18613 register values and thread-local values).
18615 A location description containing no operations indicates that the
18616 object is optimized out. The return value is 0 for that case.
18617 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18618 callers will only want a very basic result and this can become a
18621 Note that stack[0] is unused except as a default error return. */
18624 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18626 struct objfile *objfile = cu->objfile;
18628 size_t size = blk->size;
18629 const gdb_byte *data = blk->data;
18630 CORE_ADDR stack[64];
18632 unsigned int bytes_read, unsnd;
18638 stack[++stacki] = 0;
18677 stack[++stacki] = op - DW_OP_lit0;
18712 stack[++stacki] = op - DW_OP_reg0;
18714 dwarf2_complex_location_expr_complaint ();
18718 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18720 stack[++stacki] = unsnd;
18722 dwarf2_complex_location_expr_complaint ();
18726 stack[++stacki] = read_address (objfile->obfd, &data[i],
18731 case DW_OP_const1u:
18732 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18736 case DW_OP_const1s:
18737 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18741 case DW_OP_const2u:
18742 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18746 case DW_OP_const2s:
18747 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18751 case DW_OP_const4u:
18752 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18756 case DW_OP_const4s:
18757 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18761 case DW_OP_const8u:
18762 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18767 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18773 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18778 stack[stacki + 1] = stack[stacki];
18783 stack[stacki - 1] += stack[stacki];
18787 case DW_OP_plus_uconst:
18788 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18794 stack[stacki - 1] -= stack[stacki];
18799 /* If we're not the last op, then we definitely can't encode
18800 this using GDB's address_class enum. This is valid for partial
18801 global symbols, although the variable's address will be bogus
18804 dwarf2_complex_location_expr_complaint ();
18807 case DW_OP_GNU_push_tls_address:
18808 /* The top of the stack has the offset from the beginning
18809 of the thread control block at which the variable is located. */
18810 /* Nothing should follow this operator, so the top of stack would
18812 /* This is valid for partial global symbols, but the variable's
18813 address will be bogus in the psymtab. Make it always at least
18814 non-zero to not look as a variable garbage collected by linker
18815 which have DW_OP_addr 0. */
18817 dwarf2_complex_location_expr_complaint ();
18821 case DW_OP_GNU_uninit:
18824 case DW_OP_GNU_addr_index:
18825 case DW_OP_GNU_const_index:
18826 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18833 const char *name = get_DW_OP_name (op);
18836 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18839 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18843 return (stack[stacki]);
18846 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18847 outside of the allocated space. Also enforce minimum>0. */
18848 if (stacki >= ARRAY_SIZE (stack) - 1)
18850 complaint (&symfile_complaints,
18851 _("location description stack overflow"));
18857 complaint (&symfile_complaints,
18858 _("location description stack underflow"));
18862 return (stack[stacki]);
18865 /* memory allocation interface */
18867 static struct dwarf_block *
18868 dwarf_alloc_block (struct dwarf2_cu *cu)
18870 struct dwarf_block *blk;
18872 blk = (struct dwarf_block *)
18873 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18877 static struct die_info *
18878 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18880 struct die_info *die;
18881 size_t size = sizeof (struct die_info);
18884 size += (num_attrs - 1) * sizeof (struct attribute);
18886 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18887 memset (die, 0, sizeof (struct die_info));
18892 /* Macro support. */
18894 /* Return file name relative to the compilation directory of file number I in
18895 *LH's file name table. The result is allocated using xmalloc; the caller is
18896 responsible for freeing it. */
18899 file_file_name (int file, struct line_header *lh)
18901 /* Is the file number a valid index into the line header's file name
18902 table? Remember that file numbers start with one, not zero. */
18903 if (1 <= file && file <= lh->num_file_names)
18905 struct file_entry *fe = &lh->file_names[file - 1];
18907 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18908 return xstrdup (fe->name);
18909 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18914 /* The compiler produced a bogus file number. We can at least
18915 record the macro definitions made in the file, even if we
18916 won't be able to find the file by name. */
18917 char fake_name[80];
18919 xsnprintf (fake_name, sizeof (fake_name),
18920 "<bad macro file number %d>", file);
18922 complaint (&symfile_complaints,
18923 _("bad file number in macro information (%d)"),
18926 return xstrdup (fake_name);
18930 /* Return the full name of file number I in *LH's file name table.
18931 Use COMP_DIR as the name of the current directory of the
18932 compilation. The result is allocated using xmalloc; the caller is
18933 responsible for freeing it. */
18935 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18937 /* Is the file number a valid index into the line header's file name
18938 table? Remember that file numbers start with one, not zero. */
18939 if (1 <= file && file <= lh->num_file_names)
18941 char *relative = file_file_name (file, lh);
18943 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18945 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18948 return file_file_name (file, lh);
18952 static struct macro_source_file *
18953 macro_start_file (int file, int line,
18954 struct macro_source_file *current_file,
18955 const char *comp_dir,
18956 struct line_header *lh, struct objfile *objfile)
18958 /* File name relative to the compilation directory of this source file. */
18959 char *file_name = file_file_name (file, lh);
18961 /* We don't create a macro table for this compilation unit
18962 at all until we actually get a filename. */
18963 if (! pending_macros)
18964 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18965 objfile->per_bfd->macro_cache,
18968 if (! current_file)
18970 /* If we have no current file, then this must be the start_file
18971 directive for the compilation unit's main source file. */
18972 current_file = macro_set_main (pending_macros, file_name);
18973 macro_define_special (pending_macros);
18976 current_file = macro_include (current_file, line, file_name);
18980 return current_file;
18984 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18985 followed by a null byte. */
18987 copy_string (const char *buf, int len)
18989 char *s = xmalloc (len + 1);
18991 memcpy (s, buf, len);
18997 static const char *
18998 consume_improper_spaces (const char *p, const char *body)
19002 complaint (&symfile_complaints,
19003 _("macro definition contains spaces "
19004 "in formal argument list:\n`%s'"),
19016 parse_macro_definition (struct macro_source_file *file, int line,
19021 /* The body string takes one of two forms. For object-like macro
19022 definitions, it should be:
19024 <macro name> " " <definition>
19026 For function-like macro definitions, it should be:
19028 <macro name> "() " <definition>
19030 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
19032 Spaces may appear only where explicitly indicated, and in the
19035 The Dwarf 2 spec says that an object-like macro's name is always
19036 followed by a space, but versions of GCC around March 2002 omit
19037 the space when the macro's definition is the empty string.
19039 The Dwarf 2 spec says that there should be no spaces between the
19040 formal arguments in a function-like macro's formal argument list,
19041 but versions of GCC around March 2002 include spaces after the
19045 /* Find the extent of the macro name. The macro name is terminated
19046 by either a space or null character (for an object-like macro) or
19047 an opening paren (for a function-like macro). */
19048 for (p = body; *p; p++)
19049 if (*p == ' ' || *p == '(')
19052 if (*p == ' ' || *p == '\0')
19054 /* It's an object-like macro. */
19055 int name_len = p - body;
19056 char *name = copy_string (body, name_len);
19057 const char *replacement;
19060 replacement = body + name_len + 1;
19063 dwarf2_macro_malformed_definition_complaint (body);
19064 replacement = body + name_len;
19067 macro_define_object (file, line, name, replacement);
19071 else if (*p == '(')
19073 /* It's a function-like macro. */
19074 char *name = copy_string (body, p - body);
19077 char **argv = xmalloc (argv_size * sizeof (*argv));
19081 p = consume_improper_spaces (p, body);
19083 /* Parse the formal argument list. */
19084 while (*p && *p != ')')
19086 /* Find the extent of the current argument name. */
19087 const char *arg_start = p;
19089 while (*p && *p != ',' && *p != ')' && *p != ' ')
19092 if (! *p || p == arg_start)
19093 dwarf2_macro_malformed_definition_complaint (body);
19096 /* Make sure argv has room for the new argument. */
19097 if (argc >= argv_size)
19100 argv = xrealloc (argv, argv_size * sizeof (*argv));
19103 argv[argc++] = copy_string (arg_start, p - arg_start);
19106 p = consume_improper_spaces (p, body);
19108 /* Consume the comma, if present. */
19113 p = consume_improper_spaces (p, body);
19122 /* Perfectly formed definition, no complaints. */
19123 macro_define_function (file, line, name,
19124 argc, (const char **) argv,
19126 else if (*p == '\0')
19128 /* Complain, but do define it. */
19129 dwarf2_macro_malformed_definition_complaint (body);
19130 macro_define_function (file, line, name,
19131 argc, (const char **) argv,
19135 /* Just complain. */
19136 dwarf2_macro_malformed_definition_complaint (body);
19139 /* Just complain. */
19140 dwarf2_macro_malformed_definition_complaint (body);
19146 for (i = 0; i < argc; i++)
19152 dwarf2_macro_malformed_definition_complaint (body);
19155 /* Skip some bytes from BYTES according to the form given in FORM.
19156 Returns the new pointer. */
19158 static const gdb_byte *
19159 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
19160 enum dwarf_form form,
19161 unsigned int offset_size,
19162 struct dwarf2_section_info *section)
19164 unsigned int bytes_read;
19168 case DW_FORM_data1:
19173 case DW_FORM_data2:
19177 case DW_FORM_data4:
19181 case DW_FORM_data8:
19185 case DW_FORM_string:
19186 read_direct_string (abfd, bytes, &bytes_read);
19187 bytes += bytes_read;
19190 case DW_FORM_sec_offset:
19192 case DW_FORM_GNU_strp_alt:
19193 bytes += offset_size;
19196 case DW_FORM_block:
19197 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
19198 bytes += bytes_read;
19201 case DW_FORM_block1:
19202 bytes += 1 + read_1_byte (abfd, bytes);
19204 case DW_FORM_block2:
19205 bytes += 2 + read_2_bytes (abfd, bytes);
19207 case DW_FORM_block4:
19208 bytes += 4 + read_4_bytes (abfd, bytes);
19211 case DW_FORM_sdata:
19212 case DW_FORM_udata:
19213 case DW_FORM_GNU_addr_index:
19214 case DW_FORM_GNU_str_index:
19215 bytes = gdb_skip_leb128 (bytes, buffer_end);
19218 dwarf2_section_buffer_overflow_complaint (section);
19226 complaint (&symfile_complaints,
19227 _("invalid form 0x%x in `%s'"),
19229 section->asection->name);
19237 /* A helper for dwarf_decode_macros that handles skipping an unknown
19238 opcode. Returns an updated pointer to the macro data buffer; or,
19239 on error, issues a complaint and returns NULL. */
19241 static const gdb_byte *
19242 skip_unknown_opcode (unsigned int opcode,
19243 const gdb_byte **opcode_definitions,
19244 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19246 unsigned int offset_size,
19247 struct dwarf2_section_info *section)
19249 unsigned int bytes_read, i;
19251 const gdb_byte *defn;
19253 if (opcode_definitions[opcode] == NULL)
19255 complaint (&symfile_complaints,
19256 _("unrecognized DW_MACFINO opcode 0x%x"),
19261 defn = opcode_definitions[opcode];
19262 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
19263 defn += bytes_read;
19265 for (i = 0; i < arg; ++i)
19267 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
19269 if (mac_ptr == NULL)
19271 /* skip_form_bytes already issued the complaint. */
19279 /* A helper function which parses the header of a macro section.
19280 If the macro section is the extended (for now called "GNU") type,
19281 then this updates *OFFSET_SIZE. Returns a pointer to just after
19282 the header, or issues a complaint and returns NULL on error. */
19284 static const gdb_byte *
19285 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
19287 const gdb_byte *mac_ptr,
19288 unsigned int *offset_size,
19289 int section_is_gnu)
19291 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
19293 if (section_is_gnu)
19295 unsigned int version, flags;
19297 version = read_2_bytes (abfd, mac_ptr);
19300 complaint (&symfile_complaints,
19301 _("unrecognized version `%d' in .debug_macro section"),
19307 flags = read_1_byte (abfd, mac_ptr);
19309 *offset_size = (flags & 1) ? 8 : 4;
19311 if ((flags & 2) != 0)
19312 /* We don't need the line table offset. */
19313 mac_ptr += *offset_size;
19315 /* Vendor opcode descriptions. */
19316 if ((flags & 4) != 0)
19318 unsigned int i, count;
19320 count = read_1_byte (abfd, mac_ptr);
19322 for (i = 0; i < count; ++i)
19324 unsigned int opcode, bytes_read;
19327 opcode = read_1_byte (abfd, mac_ptr);
19329 opcode_definitions[opcode] = mac_ptr;
19330 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19331 mac_ptr += bytes_read;
19340 /* A helper for dwarf_decode_macros that handles the GNU extensions,
19341 including DW_MACRO_GNU_transparent_include. */
19344 dwarf_decode_macro_bytes (bfd *abfd,
19345 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19346 struct macro_source_file *current_file,
19347 struct line_header *lh, const char *comp_dir,
19348 struct dwarf2_section_info *section,
19349 int section_is_gnu, int section_is_dwz,
19350 unsigned int offset_size,
19351 struct objfile *objfile,
19352 htab_t include_hash)
19354 enum dwarf_macro_record_type macinfo_type;
19355 int at_commandline;
19356 const gdb_byte *opcode_definitions[256];
19358 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19359 &offset_size, section_is_gnu);
19360 if (mac_ptr == NULL)
19362 /* We already issued a complaint. */
19366 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
19367 GDB is still reading the definitions from command line. First
19368 DW_MACINFO_start_file will need to be ignored as it was already executed
19369 to create CURRENT_FILE for the main source holding also the command line
19370 definitions. On first met DW_MACINFO_start_file this flag is reset to
19371 normally execute all the remaining DW_MACINFO_start_file macinfos. */
19373 at_commandline = 1;
19377 /* Do we at least have room for a macinfo type byte? */
19378 if (mac_ptr >= mac_end)
19380 dwarf2_section_buffer_overflow_complaint (section);
19384 macinfo_type = read_1_byte (abfd, mac_ptr);
19387 /* Note that we rely on the fact that the corresponding GNU and
19388 DWARF constants are the same. */
19389 switch (macinfo_type)
19391 /* A zero macinfo type indicates the end of the macro
19396 case DW_MACRO_GNU_define:
19397 case DW_MACRO_GNU_undef:
19398 case DW_MACRO_GNU_define_indirect:
19399 case DW_MACRO_GNU_undef_indirect:
19400 case DW_MACRO_GNU_define_indirect_alt:
19401 case DW_MACRO_GNU_undef_indirect_alt:
19403 unsigned int bytes_read;
19408 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19409 mac_ptr += bytes_read;
19411 if (macinfo_type == DW_MACRO_GNU_define
19412 || macinfo_type == DW_MACRO_GNU_undef)
19414 body = read_direct_string (abfd, mac_ptr, &bytes_read);
19415 mac_ptr += bytes_read;
19419 LONGEST str_offset;
19421 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
19422 mac_ptr += offset_size;
19424 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
19425 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
19428 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19430 body = read_indirect_string_from_dwz (dwz, str_offset);
19433 body = read_indirect_string_at_offset (abfd, str_offset);
19436 is_define = (macinfo_type == DW_MACRO_GNU_define
19437 || macinfo_type == DW_MACRO_GNU_define_indirect
19438 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
19439 if (! current_file)
19441 /* DWARF violation as no main source is present. */
19442 complaint (&symfile_complaints,
19443 _("debug info with no main source gives macro %s "
19445 is_define ? _("definition") : _("undefinition"),
19449 if ((line == 0 && !at_commandline)
19450 || (line != 0 && at_commandline))
19451 complaint (&symfile_complaints,
19452 _("debug info gives %s macro %s with %s line %d: %s"),
19453 at_commandline ? _("command-line") : _("in-file"),
19454 is_define ? _("definition") : _("undefinition"),
19455 line == 0 ? _("zero") : _("non-zero"), line, body);
19458 parse_macro_definition (current_file, line, body);
19461 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
19462 || macinfo_type == DW_MACRO_GNU_undef_indirect
19463 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
19464 macro_undef (current_file, line, body);
19469 case DW_MACRO_GNU_start_file:
19471 unsigned int bytes_read;
19474 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19475 mac_ptr += bytes_read;
19476 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19477 mac_ptr += bytes_read;
19479 if ((line == 0 && !at_commandline)
19480 || (line != 0 && at_commandline))
19481 complaint (&symfile_complaints,
19482 _("debug info gives source %d included "
19483 "from %s at %s line %d"),
19484 file, at_commandline ? _("command-line") : _("file"),
19485 line == 0 ? _("zero") : _("non-zero"), line);
19487 if (at_commandline)
19489 /* This DW_MACRO_GNU_start_file was executed in the
19491 at_commandline = 0;
19494 current_file = macro_start_file (file, line,
19495 current_file, comp_dir,
19500 case DW_MACRO_GNU_end_file:
19501 if (! current_file)
19502 complaint (&symfile_complaints,
19503 _("macro debug info has an unmatched "
19504 "`close_file' directive"));
19507 current_file = current_file->included_by;
19508 if (! current_file)
19510 enum dwarf_macro_record_type next_type;
19512 /* GCC circa March 2002 doesn't produce the zero
19513 type byte marking the end of the compilation
19514 unit. Complain if it's not there, but exit no
19517 /* Do we at least have room for a macinfo type byte? */
19518 if (mac_ptr >= mac_end)
19520 dwarf2_section_buffer_overflow_complaint (section);
19524 /* We don't increment mac_ptr here, so this is just
19526 next_type = read_1_byte (abfd, mac_ptr);
19527 if (next_type != 0)
19528 complaint (&symfile_complaints,
19529 _("no terminating 0-type entry for "
19530 "macros in `.debug_macinfo' section"));
19537 case DW_MACRO_GNU_transparent_include:
19538 case DW_MACRO_GNU_transparent_include_alt:
19542 bfd *include_bfd = abfd;
19543 struct dwarf2_section_info *include_section = section;
19544 struct dwarf2_section_info alt_section;
19545 const gdb_byte *include_mac_end = mac_end;
19546 int is_dwz = section_is_dwz;
19547 const gdb_byte *new_mac_ptr;
19549 offset = read_offset_1 (abfd, mac_ptr, offset_size);
19550 mac_ptr += offset_size;
19552 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
19554 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19556 dwarf2_read_section (dwarf2_per_objfile->objfile,
19559 include_bfd = dwz->macro.asection->owner;
19560 include_section = &dwz->macro;
19561 include_mac_end = dwz->macro.buffer + dwz->macro.size;
19565 new_mac_ptr = include_section->buffer + offset;
19566 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
19570 /* This has actually happened; see
19571 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
19572 complaint (&symfile_complaints,
19573 _("recursive DW_MACRO_GNU_transparent_include in "
19574 ".debug_macro section"));
19578 *slot = (void *) new_mac_ptr;
19580 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19581 include_mac_end, current_file,
19583 section, section_is_gnu, is_dwz,
19584 offset_size, objfile, include_hash);
19586 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19591 case DW_MACINFO_vendor_ext:
19592 if (!section_is_gnu)
19594 unsigned int bytes_read;
19597 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19598 mac_ptr += bytes_read;
19599 read_direct_string (abfd, mac_ptr, &bytes_read);
19600 mac_ptr += bytes_read;
19602 /* We don't recognize any vendor extensions. */
19608 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19609 mac_ptr, mac_end, abfd, offset_size,
19611 if (mac_ptr == NULL)
19615 } while (macinfo_type != 0);
19619 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19620 const char *comp_dir, int section_is_gnu)
19622 struct objfile *objfile = dwarf2_per_objfile->objfile;
19623 struct line_header *lh = cu->line_header;
19625 const gdb_byte *mac_ptr, *mac_end;
19626 struct macro_source_file *current_file = 0;
19627 enum dwarf_macro_record_type macinfo_type;
19628 unsigned int offset_size = cu->header.offset_size;
19629 const gdb_byte *opcode_definitions[256];
19630 struct cleanup *cleanup;
19631 htab_t include_hash;
19633 struct dwarf2_section_info *section;
19634 const char *section_name;
19636 if (cu->dwo_unit != NULL)
19638 if (section_is_gnu)
19640 section = &cu->dwo_unit->dwo_file->sections.macro;
19641 section_name = ".debug_macro.dwo";
19645 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19646 section_name = ".debug_macinfo.dwo";
19651 if (section_is_gnu)
19653 section = &dwarf2_per_objfile->macro;
19654 section_name = ".debug_macro";
19658 section = &dwarf2_per_objfile->macinfo;
19659 section_name = ".debug_macinfo";
19663 dwarf2_read_section (objfile, section);
19664 if (section->buffer == NULL)
19666 complaint (&symfile_complaints, _("missing %s section"), section_name);
19669 abfd = section->asection->owner;
19671 /* First pass: Find the name of the base filename.
19672 This filename is needed in order to process all macros whose definition
19673 (or undefinition) comes from the command line. These macros are defined
19674 before the first DW_MACINFO_start_file entry, and yet still need to be
19675 associated to the base file.
19677 To determine the base file name, we scan the macro definitions until we
19678 reach the first DW_MACINFO_start_file entry. We then initialize
19679 CURRENT_FILE accordingly so that any macro definition found before the
19680 first DW_MACINFO_start_file can still be associated to the base file. */
19682 mac_ptr = section->buffer + offset;
19683 mac_end = section->buffer + section->size;
19685 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19686 &offset_size, section_is_gnu);
19687 if (mac_ptr == NULL)
19689 /* We already issued a complaint. */
19695 /* Do we at least have room for a macinfo type byte? */
19696 if (mac_ptr >= mac_end)
19698 /* Complaint is printed during the second pass as GDB will probably
19699 stop the first pass earlier upon finding
19700 DW_MACINFO_start_file. */
19704 macinfo_type = read_1_byte (abfd, mac_ptr);
19707 /* Note that we rely on the fact that the corresponding GNU and
19708 DWARF constants are the same. */
19709 switch (macinfo_type)
19711 /* A zero macinfo type indicates the end of the macro
19716 case DW_MACRO_GNU_define:
19717 case DW_MACRO_GNU_undef:
19718 /* Only skip the data by MAC_PTR. */
19720 unsigned int bytes_read;
19722 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19723 mac_ptr += bytes_read;
19724 read_direct_string (abfd, mac_ptr, &bytes_read);
19725 mac_ptr += bytes_read;
19729 case DW_MACRO_GNU_start_file:
19731 unsigned int bytes_read;
19734 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19735 mac_ptr += bytes_read;
19736 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19737 mac_ptr += bytes_read;
19739 current_file = macro_start_file (file, line, current_file,
19740 comp_dir, lh, objfile);
19744 case DW_MACRO_GNU_end_file:
19745 /* No data to skip by MAC_PTR. */
19748 case DW_MACRO_GNU_define_indirect:
19749 case DW_MACRO_GNU_undef_indirect:
19750 case DW_MACRO_GNU_define_indirect_alt:
19751 case DW_MACRO_GNU_undef_indirect_alt:
19753 unsigned int bytes_read;
19755 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19756 mac_ptr += bytes_read;
19757 mac_ptr += offset_size;
19761 case DW_MACRO_GNU_transparent_include:
19762 case DW_MACRO_GNU_transparent_include_alt:
19763 /* Note that, according to the spec, a transparent include
19764 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19765 skip this opcode. */
19766 mac_ptr += offset_size;
19769 case DW_MACINFO_vendor_ext:
19770 /* Only skip the data by MAC_PTR. */
19771 if (!section_is_gnu)
19773 unsigned int bytes_read;
19775 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19776 mac_ptr += bytes_read;
19777 read_direct_string (abfd, mac_ptr, &bytes_read);
19778 mac_ptr += bytes_read;
19783 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19784 mac_ptr, mac_end, abfd, offset_size,
19786 if (mac_ptr == NULL)
19790 } while (macinfo_type != 0 && current_file == NULL);
19792 /* Second pass: Process all entries.
19794 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19795 command-line macro definitions/undefinitions. This flag is unset when we
19796 reach the first DW_MACINFO_start_file entry. */
19798 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19799 NULL, xcalloc, xfree);
19800 cleanup = make_cleanup_htab_delete (include_hash);
19801 mac_ptr = section->buffer + offset;
19802 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19803 *slot = (void *) mac_ptr;
19804 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19805 current_file, lh, comp_dir, section,
19807 offset_size, objfile, include_hash);
19808 do_cleanups (cleanup);
19811 /* Check if the attribute's form is a DW_FORM_block*
19812 if so return true else false. */
19815 attr_form_is_block (struct attribute *attr)
19817 return (attr == NULL ? 0 :
19818 attr->form == DW_FORM_block1
19819 || attr->form == DW_FORM_block2
19820 || attr->form == DW_FORM_block4
19821 || attr->form == DW_FORM_block
19822 || attr->form == DW_FORM_exprloc);
19825 /* Return non-zero if ATTR's value is a section offset --- classes
19826 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19827 You may use DW_UNSND (attr) to retrieve such offsets.
19829 Section 7.5.4, "Attribute Encodings", explains that no attribute
19830 may have a value that belongs to more than one of these classes; it
19831 would be ambiguous if we did, because we use the same forms for all
19835 attr_form_is_section_offset (struct attribute *attr)
19837 return (attr->form == DW_FORM_data4
19838 || attr->form == DW_FORM_data8
19839 || attr->form == DW_FORM_sec_offset);
19842 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19843 zero otherwise. When this function returns true, you can apply
19844 dwarf2_get_attr_constant_value to it.
19846 However, note that for some attributes you must check
19847 attr_form_is_section_offset before using this test. DW_FORM_data4
19848 and DW_FORM_data8 are members of both the constant class, and of
19849 the classes that contain offsets into other debug sections
19850 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19851 that, if an attribute's can be either a constant or one of the
19852 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19853 taken as section offsets, not constants. */
19856 attr_form_is_constant (struct attribute *attr)
19858 switch (attr->form)
19860 case DW_FORM_sdata:
19861 case DW_FORM_udata:
19862 case DW_FORM_data1:
19863 case DW_FORM_data2:
19864 case DW_FORM_data4:
19865 case DW_FORM_data8:
19872 /* Return the .debug_loc section to use for CU.
19873 For DWO files use .debug_loc.dwo. */
19875 static struct dwarf2_section_info *
19876 cu_debug_loc_section (struct dwarf2_cu *cu)
19879 return &cu->dwo_unit->dwo_file->sections.loc;
19880 return &dwarf2_per_objfile->loc;
19883 /* A helper function that fills in a dwarf2_loclist_baton. */
19886 fill_in_loclist_baton (struct dwarf2_cu *cu,
19887 struct dwarf2_loclist_baton *baton,
19888 struct attribute *attr)
19890 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19892 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19894 baton->per_cu = cu->per_cu;
19895 gdb_assert (baton->per_cu);
19896 /* We don't know how long the location list is, but make sure we
19897 don't run off the edge of the section. */
19898 baton->size = section->size - DW_UNSND (attr);
19899 baton->data = section->buffer + DW_UNSND (attr);
19900 baton->base_address = cu->base_address;
19901 baton->from_dwo = cu->dwo_unit != NULL;
19905 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19906 struct dwarf2_cu *cu, int is_block)
19908 struct objfile *objfile = dwarf2_per_objfile->objfile;
19909 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19911 if (attr_form_is_section_offset (attr)
19912 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19913 the section. If so, fall through to the complaint in the
19915 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19917 struct dwarf2_loclist_baton *baton;
19919 baton = obstack_alloc (&objfile->objfile_obstack,
19920 sizeof (struct dwarf2_loclist_baton));
19922 fill_in_loclist_baton (cu, baton, attr);
19924 if (cu->base_known == 0)
19925 complaint (&symfile_complaints,
19926 _("Location list used without "
19927 "specifying the CU base address."));
19929 SYMBOL_ACLASS_INDEX (sym) = (is_block
19930 ? dwarf2_loclist_block_index
19931 : dwarf2_loclist_index);
19932 SYMBOL_LOCATION_BATON (sym) = baton;
19936 struct dwarf2_locexpr_baton *baton;
19938 baton = obstack_alloc (&objfile->objfile_obstack,
19939 sizeof (struct dwarf2_locexpr_baton));
19940 baton->per_cu = cu->per_cu;
19941 gdb_assert (baton->per_cu);
19943 if (attr_form_is_block (attr))
19945 /* Note that we're just copying the block's data pointer
19946 here, not the actual data. We're still pointing into the
19947 info_buffer for SYM's objfile; right now we never release
19948 that buffer, but when we do clean up properly this may
19950 baton->size = DW_BLOCK (attr)->size;
19951 baton->data = DW_BLOCK (attr)->data;
19955 dwarf2_invalid_attrib_class_complaint ("location description",
19956 SYMBOL_NATURAL_NAME (sym));
19960 SYMBOL_ACLASS_INDEX (sym) = (is_block
19961 ? dwarf2_locexpr_block_index
19962 : dwarf2_locexpr_index);
19963 SYMBOL_LOCATION_BATON (sym) = baton;
19967 /* Return the OBJFILE associated with the compilation unit CU. If CU
19968 came from a separate debuginfo file, then the master objfile is
19972 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19974 struct objfile *objfile = per_cu->objfile;
19976 /* Return the master objfile, so that we can report and look up the
19977 correct file containing this variable. */
19978 if (objfile->separate_debug_objfile_backlink)
19979 objfile = objfile->separate_debug_objfile_backlink;
19984 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19985 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19986 CU_HEADERP first. */
19988 static const struct comp_unit_head *
19989 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19990 struct dwarf2_per_cu_data *per_cu)
19992 const gdb_byte *info_ptr;
19995 return &per_cu->cu->header;
19997 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
19999 memset (cu_headerp, 0, sizeof (*cu_headerp));
20000 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
20005 /* Return the address size given in the compilation unit header for CU. */
20008 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
20010 struct comp_unit_head cu_header_local;
20011 const struct comp_unit_head *cu_headerp;
20013 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20015 return cu_headerp->addr_size;
20018 /* Return the offset size given in the compilation unit header for CU. */
20021 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
20023 struct comp_unit_head cu_header_local;
20024 const struct comp_unit_head *cu_headerp;
20026 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20028 return cu_headerp->offset_size;
20031 /* See its dwarf2loc.h declaration. */
20034 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
20036 struct comp_unit_head cu_header_local;
20037 const struct comp_unit_head *cu_headerp;
20039 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20041 if (cu_headerp->version == 2)
20042 return cu_headerp->addr_size;
20044 return cu_headerp->offset_size;
20047 /* Return the text offset of the CU. The returned offset comes from
20048 this CU's objfile. If this objfile came from a separate debuginfo
20049 file, then the offset may be different from the corresponding
20050 offset in the parent objfile. */
20053 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
20055 struct objfile *objfile = per_cu->objfile;
20057 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20060 /* Locate the .debug_info compilation unit from CU's objfile which contains
20061 the DIE at OFFSET. Raises an error on failure. */
20063 static struct dwarf2_per_cu_data *
20064 dwarf2_find_containing_comp_unit (sect_offset offset,
20065 unsigned int offset_in_dwz,
20066 struct objfile *objfile)
20068 struct dwarf2_per_cu_data *this_cu;
20070 const sect_offset *cu_off;
20073 high = dwarf2_per_objfile->n_comp_units - 1;
20076 struct dwarf2_per_cu_data *mid_cu;
20077 int mid = low + (high - low) / 2;
20079 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
20080 cu_off = &mid_cu->offset;
20081 if (mid_cu->is_dwz > offset_in_dwz
20082 || (mid_cu->is_dwz == offset_in_dwz
20083 && cu_off->sect_off >= offset.sect_off))
20088 gdb_assert (low == high);
20089 this_cu = dwarf2_per_objfile->all_comp_units[low];
20090 cu_off = &this_cu->offset;
20091 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
20093 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
20094 error (_("Dwarf Error: could not find partial DIE containing "
20095 "offset 0x%lx [in module %s]"),
20096 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
20098 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
20099 <= offset.sect_off);
20100 return dwarf2_per_objfile->all_comp_units[low-1];
20104 this_cu = dwarf2_per_objfile->all_comp_units[low];
20105 if (low == dwarf2_per_objfile->n_comp_units - 1
20106 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
20107 error (_("invalid dwarf2 offset %u"), offset.sect_off);
20108 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
20113 /* Initialize dwarf2_cu CU, owned by PER_CU. */
20116 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
20118 memset (cu, 0, sizeof (*cu));
20120 cu->per_cu = per_cu;
20121 cu->objfile = per_cu->objfile;
20122 obstack_init (&cu->comp_unit_obstack);
20125 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
20128 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
20129 enum language pretend_language)
20131 struct attribute *attr;
20133 /* Set the language we're debugging. */
20134 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
20136 set_cu_language (DW_UNSND (attr), cu);
20139 cu->language = pretend_language;
20140 cu->language_defn = language_def (cu->language);
20143 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
20145 cu->producer = DW_STRING (attr);
20148 /* Release one cached compilation unit, CU. We unlink it from the tree
20149 of compilation units, but we don't remove it from the read_in_chain;
20150 the caller is responsible for that.
20151 NOTE: DATA is a void * because this function is also used as a
20152 cleanup routine. */
20155 free_heap_comp_unit (void *data)
20157 struct dwarf2_cu *cu = data;
20159 gdb_assert (cu->per_cu != NULL);
20160 cu->per_cu->cu = NULL;
20163 obstack_free (&cu->comp_unit_obstack, NULL);
20168 /* This cleanup function is passed the address of a dwarf2_cu on the stack
20169 when we're finished with it. We can't free the pointer itself, but be
20170 sure to unlink it from the cache. Also release any associated storage. */
20173 free_stack_comp_unit (void *data)
20175 struct dwarf2_cu *cu = data;
20177 gdb_assert (cu->per_cu != NULL);
20178 cu->per_cu->cu = NULL;
20181 obstack_free (&cu->comp_unit_obstack, NULL);
20182 cu->partial_dies = NULL;
20185 /* Free all cached compilation units. */
20188 free_cached_comp_units (void *data)
20190 struct dwarf2_per_cu_data *per_cu, **last_chain;
20192 per_cu = dwarf2_per_objfile->read_in_chain;
20193 last_chain = &dwarf2_per_objfile->read_in_chain;
20194 while (per_cu != NULL)
20196 struct dwarf2_per_cu_data *next_cu;
20198 next_cu = per_cu->cu->read_in_chain;
20200 free_heap_comp_unit (per_cu->cu);
20201 *last_chain = next_cu;
20207 /* Increase the age counter on each cached compilation unit, and free
20208 any that are too old. */
20211 age_cached_comp_units (void)
20213 struct dwarf2_per_cu_data *per_cu, **last_chain;
20215 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
20216 per_cu = dwarf2_per_objfile->read_in_chain;
20217 while (per_cu != NULL)
20219 per_cu->cu->last_used ++;
20220 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
20221 dwarf2_mark (per_cu->cu);
20222 per_cu = per_cu->cu->read_in_chain;
20225 per_cu = dwarf2_per_objfile->read_in_chain;
20226 last_chain = &dwarf2_per_objfile->read_in_chain;
20227 while (per_cu != NULL)
20229 struct dwarf2_per_cu_data *next_cu;
20231 next_cu = per_cu->cu->read_in_chain;
20233 if (!per_cu->cu->mark)
20235 free_heap_comp_unit (per_cu->cu);
20236 *last_chain = next_cu;
20239 last_chain = &per_cu->cu->read_in_chain;
20245 /* Remove a single compilation unit from the cache. */
20248 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
20250 struct dwarf2_per_cu_data *per_cu, **last_chain;
20252 per_cu = dwarf2_per_objfile->read_in_chain;
20253 last_chain = &dwarf2_per_objfile->read_in_chain;
20254 while (per_cu != NULL)
20256 struct dwarf2_per_cu_data *next_cu;
20258 next_cu = per_cu->cu->read_in_chain;
20260 if (per_cu == target_per_cu)
20262 free_heap_comp_unit (per_cu->cu);
20264 *last_chain = next_cu;
20268 last_chain = &per_cu->cu->read_in_chain;
20274 /* Release all extra memory associated with OBJFILE. */
20277 dwarf2_free_objfile (struct objfile *objfile)
20279 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20281 if (dwarf2_per_objfile == NULL)
20284 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
20285 free_cached_comp_units (NULL);
20287 if (dwarf2_per_objfile->quick_file_names_table)
20288 htab_delete (dwarf2_per_objfile->quick_file_names_table);
20290 /* Everything else should be on the objfile obstack. */
20293 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
20294 We store these in a hash table separate from the DIEs, and preserve them
20295 when the DIEs are flushed out of cache.
20297 The CU "per_cu" pointer is needed because offset alone is not enough to
20298 uniquely identify the type. A file may have multiple .debug_types sections,
20299 or the type may come from a DWO file. Furthermore, while it's more logical
20300 to use per_cu->section+offset, with Fission the section with the data is in
20301 the DWO file but we don't know that section at the point we need it.
20302 We have to use something in dwarf2_per_cu_data (or the pointer to it)
20303 because we can enter the lookup routine, get_die_type_at_offset, from
20304 outside this file, and thus won't necessarily have PER_CU->cu.
20305 Fortunately, PER_CU is stable for the life of the objfile. */
20307 struct dwarf2_per_cu_offset_and_type
20309 const struct dwarf2_per_cu_data *per_cu;
20310 sect_offset offset;
20314 /* Hash function for a dwarf2_per_cu_offset_and_type. */
20317 per_cu_offset_and_type_hash (const void *item)
20319 const struct dwarf2_per_cu_offset_and_type *ofs = item;
20321 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
20324 /* Equality function for a dwarf2_per_cu_offset_and_type. */
20327 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
20329 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
20330 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
20332 return (ofs_lhs->per_cu == ofs_rhs->per_cu
20333 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
20336 /* Set the type associated with DIE to TYPE. Save it in CU's hash
20337 table if necessary. For convenience, return TYPE.
20339 The DIEs reading must have careful ordering to:
20340 * Not cause infite loops trying to read in DIEs as a prerequisite for
20341 reading current DIE.
20342 * Not trying to dereference contents of still incompletely read in types
20343 while reading in other DIEs.
20344 * Enable referencing still incompletely read in types just by a pointer to
20345 the type without accessing its fields.
20347 Therefore caller should follow these rules:
20348 * Try to fetch any prerequisite types we may need to build this DIE type
20349 before building the type and calling set_die_type.
20350 * After building type call set_die_type for current DIE as soon as
20351 possible before fetching more types to complete the current type.
20352 * Make the type as complete as possible before fetching more types. */
20354 static struct type *
20355 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20357 struct dwarf2_per_cu_offset_and_type **slot, ofs;
20358 struct objfile *objfile = cu->objfile;
20360 /* For Ada types, make sure that the gnat-specific data is always
20361 initialized (if not already set). There are a few types where
20362 we should not be doing so, because the type-specific area is
20363 already used to hold some other piece of info (eg: TYPE_CODE_FLT
20364 where the type-specific area is used to store the floatformat).
20365 But this is not a problem, because the gnat-specific information
20366 is actually not needed for these types. */
20367 if (need_gnat_info (cu)
20368 && TYPE_CODE (type) != TYPE_CODE_FUNC
20369 && TYPE_CODE (type) != TYPE_CODE_FLT
20370 && !HAVE_GNAT_AUX_INFO (type))
20371 INIT_GNAT_SPECIFIC (type);
20373 if (dwarf2_per_objfile->die_type_hash == NULL)
20375 dwarf2_per_objfile->die_type_hash =
20376 htab_create_alloc_ex (127,
20377 per_cu_offset_and_type_hash,
20378 per_cu_offset_and_type_eq,
20380 &objfile->objfile_obstack,
20381 hashtab_obstack_allocate,
20382 dummy_obstack_deallocate);
20385 ofs.per_cu = cu->per_cu;
20386 ofs.offset = die->offset;
20388 slot = (struct dwarf2_per_cu_offset_and_type **)
20389 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
20391 complaint (&symfile_complaints,
20392 _("A problem internal to GDB: DIE 0x%x has type already set"),
20393 die->offset.sect_off);
20394 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
20399 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
20400 or return NULL if the die does not have a saved type. */
20402 static struct type *
20403 get_die_type_at_offset (sect_offset offset,
20404 struct dwarf2_per_cu_data *per_cu)
20406 struct dwarf2_per_cu_offset_and_type *slot, ofs;
20408 if (dwarf2_per_objfile->die_type_hash == NULL)
20411 ofs.per_cu = per_cu;
20412 ofs.offset = offset;
20413 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
20420 /* Look up the type for DIE in CU in die_type_hash,
20421 or return NULL if DIE does not have a saved type. */
20423 static struct type *
20424 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
20426 return get_die_type_at_offset (die->offset, cu->per_cu);
20429 /* Add a dependence relationship from CU to REF_PER_CU. */
20432 dwarf2_add_dependence (struct dwarf2_cu *cu,
20433 struct dwarf2_per_cu_data *ref_per_cu)
20437 if (cu->dependencies == NULL)
20439 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
20440 NULL, &cu->comp_unit_obstack,
20441 hashtab_obstack_allocate,
20442 dummy_obstack_deallocate);
20444 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
20446 *slot = ref_per_cu;
20449 /* Subroutine of dwarf2_mark to pass to htab_traverse.
20450 Set the mark field in every compilation unit in the
20451 cache that we must keep because we are keeping CU. */
20454 dwarf2_mark_helper (void **slot, void *data)
20456 struct dwarf2_per_cu_data *per_cu;
20458 per_cu = (struct dwarf2_per_cu_data *) *slot;
20460 /* cu->dependencies references may not yet have been ever read if QUIT aborts
20461 reading of the chain. As such dependencies remain valid it is not much
20462 useful to track and undo them during QUIT cleanups. */
20463 if (per_cu->cu == NULL)
20466 if (per_cu->cu->mark)
20468 per_cu->cu->mark = 1;
20470 if (per_cu->cu->dependencies != NULL)
20471 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
20476 /* Set the mark field in CU and in every other compilation unit in the
20477 cache that we must keep because we are keeping CU. */
20480 dwarf2_mark (struct dwarf2_cu *cu)
20485 if (cu->dependencies != NULL)
20486 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
20490 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
20494 per_cu->cu->mark = 0;
20495 per_cu = per_cu->cu->read_in_chain;
20499 /* Trivial hash function for partial_die_info: the hash value of a DIE
20500 is its offset in .debug_info for this objfile. */
20503 partial_die_hash (const void *item)
20505 const struct partial_die_info *part_die = item;
20507 return part_die->offset.sect_off;
20510 /* Trivial comparison function for partial_die_info structures: two DIEs
20511 are equal if they have the same offset. */
20514 partial_die_eq (const void *item_lhs, const void *item_rhs)
20516 const struct partial_die_info *part_die_lhs = item_lhs;
20517 const struct partial_die_info *part_die_rhs = item_rhs;
20519 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
20522 static struct cmd_list_element *set_dwarf2_cmdlist;
20523 static struct cmd_list_element *show_dwarf2_cmdlist;
20526 set_dwarf2_cmd (char *args, int from_tty)
20528 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
20532 show_dwarf2_cmd (char *args, int from_tty)
20534 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
20537 /* Free data associated with OBJFILE, if necessary. */
20540 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
20542 struct dwarf2_per_objfile *data = d;
20545 /* Make sure we don't accidentally use dwarf2_per_objfile while
20547 dwarf2_per_objfile = NULL;
20549 for (ix = 0; ix < data->n_comp_units; ++ix)
20550 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
20552 for (ix = 0; ix < data->n_type_units; ++ix)
20553 VEC_free (dwarf2_per_cu_ptr,
20554 data->all_type_units[ix]->per_cu.imported_symtabs);
20555 xfree (data->all_type_units);
20557 VEC_free (dwarf2_section_info_def, data->types);
20559 if (data->dwo_files)
20560 free_dwo_files (data->dwo_files, objfile);
20561 if (data->dwp_file)
20562 gdb_bfd_unref (data->dwp_file->dbfd);
20564 if (data->dwz_file && data->dwz_file->dwz_bfd)
20565 gdb_bfd_unref (data->dwz_file->dwz_bfd);
20569 /* The "save gdb-index" command. */
20571 /* The contents of the hash table we create when building the string
20573 struct strtab_entry
20575 offset_type offset;
20579 /* Hash function for a strtab_entry.
20581 Function is used only during write_hash_table so no index format backward
20582 compatibility is needed. */
20585 hash_strtab_entry (const void *e)
20587 const struct strtab_entry *entry = e;
20588 return mapped_index_string_hash (INT_MAX, entry->str);
20591 /* Equality function for a strtab_entry. */
20594 eq_strtab_entry (const void *a, const void *b)
20596 const struct strtab_entry *ea = a;
20597 const struct strtab_entry *eb = b;
20598 return !strcmp (ea->str, eb->str);
20601 /* Create a strtab_entry hash table. */
20604 create_strtab (void)
20606 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
20607 xfree, xcalloc, xfree);
20610 /* Add a string to the constant pool. Return the string's offset in
20614 add_string (htab_t table, struct obstack *cpool, const char *str)
20617 struct strtab_entry entry;
20618 struct strtab_entry *result;
20621 slot = htab_find_slot (table, &entry, INSERT);
20626 result = XNEW (struct strtab_entry);
20627 result->offset = obstack_object_size (cpool);
20629 obstack_grow_str0 (cpool, str);
20632 return result->offset;
20635 /* An entry in the symbol table. */
20636 struct symtab_index_entry
20638 /* The name of the symbol. */
20640 /* The offset of the name in the constant pool. */
20641 offset_type index_offset;
20642 /* A sorted vector of the indices of all the CUs that hold an object
20644 VEC (offset_type) *cu_indices;
20647 /* The symbol table. This is a power-of-2-sized hash table. */
20648 struct mapped_symtab
20650 offset_type n_elements;
20652 struct symtab_index_entry **data;
20655 /* Hash function for a symtab_index_entry. */
20658 hash_symtab_entry (const void *e)
20660 const struct symtab_index_entry *entry = e;
20661 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
20662 sizeof (offset_type) * VEC_length (offset_type,
20663 entry->cu_indices),
20667 /* Equality function for a symtab_index_entry. */
20670 eq_symtab_entry (const void *a, const void *b)
20672 const struct symtab_index_entry *ea = a;
20673 const struct symtab_index_entry *eb = b;
20674 int len = VEC_length (offset_type, ea->cu_indices);
20675 if (len != VEC_length (offset_type, eb->cu_indices))
20677 return !memcmp (VEC_address (offset_type, ea->cu_indices),
20678 VEC_address (offset_type, eb->cu_indices),
20679 sizeof (offset_type) * len);
20682 /* Destroy a symtab_index_entry. */
20685 delete_symtab_entry (void *p)
20687 struct symtab_index_entry *entry = p;
20688 VEC_free (offset_type, entry->cu_indices);
20692 /* Create a hash table holding symtab_index_entry objects. */
20695 create_symbol_hash_table (void)
20697 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
20698 delete_symtab_entry, xcalloc, xfree);
20701 /* Create a new mapped symtab object. */
20703 static struct mapped_symtab *
20704 create_mapped_symtab (void)
20706 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20707 symtab->n_elements = 0;
20708 symtab->size = 1024;
20709 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20713 /* Destroy a mapped_symtab. */
20716 cleanup_mapped_symtab (void *p)
20718 struct mapped_symtab *symtab = p;
20719 /* The contents of the array are freed when the other hash table is
20721 xfree (symtab->data);
20725 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20728 Function is used only during write_hash_table so no index format backward
20729 compatibility is needed. */
20731 static struct symtab_index_entry **
20732 find_slot (struct mapped_symtab *symtab, const char *name)
20734 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20736 index = hash & (symtab->size - 1);
20737 step = ((hash * 17) & (symtab->size - 1)) | 1;
20741 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20742 return &symtab->data[index];
20743 index = (index + step) & (symtab->size - 1);
20747 /* Expand SYMTAB's hash table. */
20750 hash_expand (struct mapped_symtab *symtab)
20752 offset_type old_size = symtab->size;
20754 struct symtab_index_entry **old_entries = symtab->data;
20757 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20759 for (i = 0; i < old_size; ++i)
20761 if (old_entries[i])
20763 struct symtab_index_entry **slot = find_slot (symtab,
20764 old_entries[i]->name);
20765 *slot = old_entries[i];
20769 xfree (old_entries);
20772 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20773 CU_INDEX is the index of the CU in which the symbol appears.
20774 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20777 add_index_entry (struct mapped_symtab *symtab, const char *name,
20778 int is_static, gdb_index_symbol_kind kind,
20779 offset_type cu_index)
20781 struct symtab_index_entry **slot;
20782 offset_type cu_index_and_attrs;
20784 ++symtab->n_elements;
20785 if (4 * symtab->n_elements / 3 >= symtab->size)
20786 hash_expand (symtab);
20788 slot = find_slot (symtab, name);
20791 *slot = XNEW (struct symtab_index_entry);
20792 (*slot)->name = name;
20793 /* index_offset is set later. */
20794 (*slot)->cu_indices = NULL;
20797 cu_index_and_attrs = 0;
20798 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20799 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20800 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20802 /* We don't want to record an index value twice as we want to avoid the
20804 We process all global symbols and then all static symbols
20805 (which would allow us to avoid the duplication by only having to check
20806 the last entry pushed), but a symbol could have multiple kinds in one CU.
20807 To keep things simple we don't worry about the duplication here and
20808 sort and uniqufy the list after we've processed all symbols. */
20809 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20812 /* qsort helper routine for uniquify_cu_indices. */
20815 offset_type_compare (const void *ap, const void *bp)
20817 offset_type a = *(offset_type *) ap;
20818 offset_type b = *(offset_type *) bp;
20820 return (a > b) - (b > a);
20823 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20826 uniquify_cu_indices (struct mapped_symtab *symtab)
20830 for (i = 0; i < symtab->size; ++i)
20832 struct symtab_index_entry *entry = symtab->data[i];
20835 && entry->cu_indices != NULL)
20837 unsigned int next_to_insert, next_to_check;
20838 offset_type last_value;
20840 qsort (VEC_address (offset_type, entry->cu_indices),
20841 VEC_length (offset_type, entry->cu_indices),
20842 sizeof (offset_type), offset_type_compare);
20844 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20845 next_to_insert = 1;
20846 for (next_to_check = 1;
20847 next_to_check < VEC_length (offset_type, entry->cu_indices);
20850 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20853 last_value = VEC_index (offset_type, entry->cu_indices,
20855 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20860 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20865 /* Add a vector of indices to the constant pool. */
20868 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20869 struct symtab_index_entry *entry)
20873 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20876 offset_type len = VEC_length (offset_type, entry->cu_indices);
20877 offset_type val = MAYBE_SWAP (len);
20882 entry->index_offset = obstack_object_size (cpool);
20884 obstack_grow (cpool, &val, sizeof (val));
20886 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20889 val = MAYBE_SWAP (iter);
20890 obstack_grow (cpool, &val, sizeof (val));
20895 struct symtab_index_entry *old_entry = *slot;
20896 entry->index_offset = old_entry->index_offset;
20899 return entry->index_offset;
20902 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20903 constant pool entries going into the obstack CPOOL. */
20906 write_hash_table (struct mapped_symtab *symtab,
20907 struct obstack *output, struct obstack *cpool)
20910 htab_t symbol_hash_table;
20913 symbol_hash_table = create_symbol_hash_table ();
20914 str_table = create_strtab ();
20916 /* We add all the index vectors to the constant pool first, to
20917 ensure alignment is ok. */
20918 for (i = 0; i < symtab->size; ++i)
20920 if (symtab->data[i])
20921 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20924 /* Now write out the hash table. */
20925 for (i = 0; i < symtab->size; ++i)
20927 offset_type str_off, vec_off;
20929 if (symtab->data[i])
20931 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20932 vec_off = symtab->data[i]->index_offset;
20936 /* While 0 is a valid constant pool index, it is not valid
20937 to have 0 for both offsets. */
20942 str_off = MAYBE_SWAP (str_off);
20943 vec_off = MAYBE_SWAP (vec_off);
20945 obstack_grow (output, &str_off, sizeof (str_off));
20946 obstack_grow (output, &vec_off, sizeof (vec_off));
20949 htab_delete (str_table);
20950 htab_delete (symbol_hash_table);
20953 /* Struct to map psymtab to CU index in the index file. */
20954 struct psymtab_cu_index_map
20956 struct partial_symtab *psymtab;
20957 unsigned int cu_index;
20961 hash_psymtab_cu_index (const void *item)
20963 const struct psymtab_cu_index_map *map = item;
20965 return htab_hash_pointer (map->psymtab);
20969 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
20971 const struct psymtab_cu_index_map *lhs = item_lhs;
20972 const struct psymtab_cu_index_map *rhs = item_rhs;
20974 return lhs->psymtab == rhs->psymtab;
20977 /* Helper struct for building the address table. */
20978 struct addrmap_index_data
20980 struct objfile *objfile;
20981 struct obstack *addr_obstack;
20982 htab_t cu_index_htab;
20984 /* Non-zero if the previous_* fields are valid.
20985 We can't write an entry until we see the next entry (since it is only then
20986 that we know the end of the entry). */
20987 int previous_valid;
20988 /* Index of the CU in the table of all CUs in the index file. */
20989 unsigned int previous_cu_index;
20990 /* Start address of the CU. */
20991 CORE_ADDR previous_cu_start;
20994 /* Write an address entry to OBSTACK. */
20997 add_address_entry (struct objfile *objfile, struct obstack *obstack,
20998 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
21000 offset_type cu_index_to_write;
21002 CORE_ADDR baseaddr;
21004 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21006 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
21007 obstack_grow (obstack, addr, 8);
21008 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
21009 obstack_grow (obstack, addr, 8);
21010 cu_index_to_write = MAYBE_SWAP (cu_index);
21011 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
21014 /* Worker function for traversing an addrmap to build the address table. */
21017 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
21019 struct addrmap_index_data *data = datap;
21020 struct partial_symtab *pst = obj;
21022 if (data->previous_valid)
21023 add_address_entry (data->objfile, data->addr_obstack,
21024 data->previous_cu_start, start_addr,
21025 data->previous_cu_index);
21027 data->previous_cu_start = start_addr;
21030 struct psymtab_cu_index_map find_map, *map;
21031 find_map.psymtab = pst;
21032 map = htab_find (data->cu_index_htab, &find_map);
21033 gdb_assert (map != NULL);
21034 data->previous_cu_index = map->cu_index;
21035 data->previous_valid = 1;
21038 data->previous_valid = 0;
21043 /* Write OBJFILE's address map to OBSTACK.
21044 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
21045 in the index file. */
21048 write_address_map (struct objfile *objfile, struct obstack *obstack,
21049 htab_t cu_index_htab)
21051 struct addrmap_index_data addrmap_index_data;
21053 /* When writing the address table, we have to cope with the fact that
21054 the addrmap iterator only provides the start of a region; we have to
21055 wait until the next invocation to get the start of the next region. */
21057 addrmap_index_data.objfile = objfile;
21058 addrmap_index_data.addr_obstack = obstack;
21059 addrmap_index_data.cu_index_htab = cu_index_htab;
21060 addrmap_index_data.previous_valid = 0;
21062 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
21063 &addrmap_index_data);
21065 /* It's highly unlikely the last entry (end address = 0xff...ff)
21066 is valid, but we should still handle it.
21067 The end address is recorded as the start of the next region, but that
21068 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
21070 if (addrmap_index_data.previous_valid)
21071 add_address_entry (objfile, obstack,
21072 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
21073 addrmap_index_data.previous_cu_index);
21076 /* Return the symbol kind of PSYM. */
21078 static gdb_index_symbol_kind
21079 symbol_kind (struct partial_symbol *psym)
21081 domain_enum domain = PSYMBOL_DOMAIN (psym);
21082 enum address_class aclass = PSYMBOL_CLASS (psym);
21090 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
21092 return GDB_INDEX_SYMBOL_KIND_TYPE;
21094 case LOC_CONST_BYTES:
21095 case LOC_OPTIMIZED_OUT:
21097 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21099 /* Note: It's currently impossible to recognize psyms as enum values
21100 short of reading the type info. For now punt. */
21101 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21103 /* There are other LOC_FOO values that one might want to classify
21104 as variables, but dwarf2read.c doesn't currently use them. */
21105 return GDB_INDEX_SYMBOL_KIND_OTHER;
21107 case STRUCT_DOMAIN:
21108 return GDB_INDEX_SYMBOL_KIND_TYPE;
21110 return GDB_INDEX_SYMBOL_KIND_OTHER;
21114 /* Add a list of partial symbols to SYMTAB. */
21117 write_psymbols (struct mapped_symtab *symtab,
21119 struct partial_symbol **psymp,
21121 offset_type cu_index,
21124 for (; count-- > 0; ++psymp)
21126 struct partial_symbol *psym = *psymp;
21129 if (SYMBOL_LANGUAGE (psym) == language_ada)
21130 error (_("Ada is not currently supported by the index"));
21132 /* Only add a given psymbol once. */
21133 slot = htab_find_slot (psyms_seen, psym, INSERT);
21136 gdb_index_symbol_kind kind = symbol_kind (psym);
21139 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
21140 is_static, kind, cu_index);
21145 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
21146 exception if there is an error. */
21149 write_obstack (FILE *file, struct obstack *obstack)
21151 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
21153 != obstack_object_size (obstack))
21154 error (_("couldn't data write to file"));
21157 /* Unlink a file if the argument is not NULL. */
21160 unlink_if_set (void *p)
21162 char **filename = p;
21164 unlink (*filename);
21167 /* A helper struct used when iterating over debug_types. */
21168 struct signatured_type_index_data
21170 struct objfile *objfile;
21171 struct mapped_symtab *symtab;
21172 struct obstack *types_list;
21177 /* A helper function that writes a single signatured_type to an
21181 write_one_signatured_type (void **slot, void *d)
21183 struct signatured_type_index_data *info = d;
21184 struct signatured_type *entry = (struct signatured_type *) *slot;
21185 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
21188 write_psymbols (info->symtab,
21190 info->objfile->global_psymbols.list
21191 + psymtab->globals_offset,
21192 psymtab->n_global_syms, info->cu_index,
21194 write_psymbols (info->symtab,
21196 info->objfile->static_psymbols.list
21197 + psymtab->statics_offset,
21198 psymtab->n_static_syms, info->cu_index,
21201 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21202 entry->per_cu.offset.sect_off);
21203 obstack_grow (info->types_list, val, 8);
21204 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21205 entry->type_offset_in_tu.cu_off);
21206 obstack_grow (info->types_list, val, 8);
21207 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
21208 obstack_grow (info->types_list, val, 8);
21215 /* Recurse into all "included" dependencies and write their symbols as
21216 if they appeared in this psymtab. */
21219 recursively_write_psymbols (struct objfile *objfile,
21220 struct partial_symtab *psymtab,
21221 struct mapped_symtab *symtab,
21223 offset_type cu_index)
21227 for (i = 0; i < psymtab->number_of_dependencies; ++i)
21228 if (psymtab->dependencies[i]->user != NULL)
21229 recursively_write_psymbols (objfile, psymtab->dependencies[i],
21230 symtab, psyms_seen, cu_index);
21232 write_psymbols (symtab,
21234 objfile->global_psymbols.list + psymtab->globals_offset,
21235 psymtab->n_global_syms, cu_index,
21237 write_psymbols (symtab,
21239 objfile->static_psymbols.list + psymtab->statics_offset,
21240 psymtab->n_static_syms, cu_index,
21244 /* Create an index file for OBJFILE in the directory DIR. */
21247 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
21249 struct cleanup *cleanup;
21250 char *filename, *cleanup_filename;
21251 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
21252 struct obstack cu_list, types_cu_list;
21255 struct mapped_symtab *symtab;
21256 offset_type val, size_of_contents, total_len;
21259 htab_t cu_index_htab;
21260 struct psymtab_cu_index_map *psymtab_cu_index_map;
21262 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
21265 if (dwarf2_per_objfile->using_index)
21266 error (_("Cannot use an index to create the index"));
21268 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
21269 error (_("Cannot make an index when the file has multiple .debug_types sections"));
21271 if (stat (objfile->name, &st) < 0)
21272 perror_with_name (objfile->name);
21274 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
21275 INDEX_SUFFIX, (char *) NULL);
21276 cleanup = make_cleanup (xfree, filename);
21278 out_file = gdb_fopen_cloexec (filename, "wb");
21280 error (_("Can't open `%s' for writing"), filename);
21282 cleanup_filename = filename;
21283 make_cleanup (unlink_if_set, &cleanup_filename);
21285 symtab = create_mapped_symtab ();
21286 make_cleanup (cleanup_mapped_symtab, symtab);
21288 obstack_init (&addr_obstack);
21289 make_cleanup_obstack_free (&addr_obstack);
21291 obstack_init (&cu_list);
21292 make_cleanup_obstack_free (&cu_list);
21294 obstack_init (&types_cu_list);
21295 make_cleanup_obstack_free (&types_cu_list);
21297 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
21298 NULL, xcalloc, xfree);
21299 make_cleanup_htab_delete (psyms_seen);
21301 /* While we're scanning CU's create a table that maps a psymtab pointer
21302 (which is what addrmap records) to its index (which is what is recorded
21303 in the index file). This will later be needed to write the address
21305 cu_index_htab = htab_create_alloc (100,
21306 hash_psymtab_cu_index,
21307 eq_psymtab_cu_index,
21308 NULL, xcalloc, xfree);
21309 make_cleanup_htab_delete (cu_index_htab);
21310 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
21311 xmalloc (sizeof (struct psymtab_cu_index_map)
21312 * dwarf2_per_objfile->n_comp_units);
21313 make_cleanup (xfree, psymtab_cu_index_map);
21315 /* The CU list is already sorted, so we don't need to do additional
21316 work here. Also, the debug_types entries do not appear in
21317 all_comp_units, but only in their own hash table. */
21318 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
21320 struct dwarf2_per_cu_data *per_cu
21321 = dwarf2_per_objfile->all_comp_units[i];
21322 struct partial_symtab *psymtab = per_cu->v.psymtab;
21324 struct psymtab_cu_index_map *map;
21327 /* CU of a shared file from 'dwz -m' may be unused by this main file.
21328 It may be referenced from a local scope but in such case it does not
21329 need to be present in .gdb_index. */
21330 if (psymtab == NULL)
21333 if (psymtab->user == NULL)
21334 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
21336 map = &psymtab_cu_index_map[i];
21337 map->psymtab = psymtab;
21339 slot = htab_find_slot (cu_index_htab, map, INSERT);
21340 gdb_assert (slot != NULL);
21341 gdb_assert (*slot == NULL);
21344 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21345 per_cu->offset.sect_off);
21346 obstack_grow (&cu_list, val, 8);
21347 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
21348 obstack_grow (&cu_list, val, 8);
21351 /* Dump the address map. */
21352 write_address_map (objfile, &addr_obstack, cu_index_htab);
21354 /* Write out the .debug_type entries, if any. */
21355 if (dwarf2_per_objfile->signatured_types)
21357 struct signatured_type_index_data sig_data;
21359 sig_data.objfile = objfile;
21360 sig_data.symtab = symtab;
21361 sig_data.types_list = &types_cu_list;
21362 sig_data.psyms_seen = psyms_seen;
21363 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
21364 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
21365 write_one_signatured_type, &sig_data);
21368 /* Now that we've processed all symbols we can shrink their cu_indices
21370 uniquify_cu_indices (symtab);
21372 obstack_init (&constant_pool);
21373 make_cleanup_obstack_free (&constant_pool);
21374 obstack_init (&symtab_obstack);
21375 make_cleanup_obstack_free (&symtab_obstack);
21376 write_hash_table (symtab, &symtab_obstack, &constant_pool);
21378 obstack_init (&contents);
21379 make_cleanup_obstack_free (&contents);
21380 size_of_contents = 6 * sizeof (offset_type);
21381 total_len = size_of_contents;
21383 /* The version number. */
21384 val = MAYBE_SWAP (8);
21385 obstack_grow (&contents, &val, sizeof (val));
21387 /* The offset of the CU list from the start of the file. */
21388 val = MAYBE_SWAP (total_len);
21389 obstack_grow (&contents, &val, sizeof (val));
21390 total_len += obstack_object_size (&cu_list);
21392 /* The offset of the types CU list from the start of the file. */
21393 val = MAYBE_SWAP (total_len);
21394 obstack_grow (&contents, &val, sizeof (val));
21395 total_len += obstack_object_size (&types_cu_list);
21397 /* The offset of the address table from the start of the file. */
21398 val = MAYBE_SWAP (total_len);
21399 obstack_grow (&contents, &val, sizeof (val));
21400 total_len += obstack_object_size (&addr_obstack);
21402 /* The offset of the symbol table from the start of the file. */
21403 val = MAYBE_SWAP (total_len);
21404 obstack_grow (&contents, &val, sizeof (val));
21405 total_len += obstack_object_size (&symtab_obstack);
21407 /* The offset of the constant pool from the start of the file. */
21408 val = MAYBE_SWAP (total_len);
21409 obstack_grow (&contents, &val, sizeof (val));
21410 total_len += obstack_object_size (&constant_pool);
21412 gdb_assert (obstack_object_size (&contents) == size_of_contents);
21414 write_obstack (out_file, &contents);
21415 write_obstack (out_file, &cu_list);
21416 write_obstack (out_file, &types_cu_list);
21417 write_obstack (out_file, &addr_obstack);
21418 write_obstack (out_file, &symtab_obstack);
21419 write_obstack (out_file, &constant_pool);
21423 /* We want to keep the file, so we set cleanup_filename to NULL
21424 here. See unlink_if_set. */
21425 cleanup_filename = NULL;
21427 do_cleanups (cleanup);
21430 /* Implementation of the `save gdb-index' command.
21432 Note that the file format used by this command is documented in the
21433 GDB manual. Any changes here must be documented there. */
21436 save_gdb_index_command (char *arg, int from_tty)
21438 struct objfile *objfile;
21441 error (_("usage: save gdb-index DIRECTORY"));
21443 ALL_OBJFILES (objfile)
21447 /* If the objfile does not correspond to an actual file, skip it. */
21448 if (stat (objfile->name, &st) < 0)
21451 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21452 if (dwarf2_per_objfile)
21454 volatile struct gdb_exception except;
21456 TRY_CATCH (except, RETURN_MASK_ERROR)
21458 write_psymtabs_to_index (objfile, arg);
21460 if (except.reason < 0)
21461 exception_fprintf (gdb_stderr, except,
21462 _("Error while writing index for `%s': "),
21470 int dwarf2_always_disassemble;
21473 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
21474 struct cmd_list_element *c, const char *value)
21476 fprintf_filtered (file,
21477 _("Whether to always disassemble "
21478 "DWARF expressions is %s.\n"),
21483 show_check_physname (struct ui_file *file, int from_tty,
21484 struct cmd_list_element *c, const char *value)
21486 fprintf_filtered (file,
21487 _("Whether to check \"physname\" is %s.\n"),
21491 void _initialize_dwarf2_read (void);
21494 _initialize_dwarf2_read (void)
21496 struct cmd_list_element *c;
21498 dwarf2_objfile_data_key
21499 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
21501 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
21502 Set DWARF 2 specific variables.\n\
21503 Configure DWARF 2 variables such as the cache size"),
21504 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
21505 0/*allow-unknown*/, &maintenance_set_cmdlist);
21507 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
21508 Show DWARF 2 specific variables\n\
21509 Show DWARF 2 variables such as the cache size"),
21510 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
21511 0/*allow-unknown*/, &maintenance_show_cmdlist);
21513 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
21514 &dwarf2_max_cache_age, _("\
21515 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
21516 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
21517 A higher limit means that cached compilation units will be stored\n\
21518 in memory longer, and more total memory will be used. Zero disables\n\
21519 caching, which can slow down startup."),
21521 show_dwarf2_max_cache_age,
21522 &set_dwarf2_cmdlist,
21523 &show_dwarf2_cmdlist);
21525 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
21526 &dwarf2_always_disassemble, _("\
21527 Set whether `info address' always disassembles DWARF expressions."), _("\
21528 Show whether `info address' always disassembles DWARF expressions."), _("\
21529 When enabled, DWARF expressions are always printed in an assembly-like\n\
21530 syntax. When disabled, expressions will be printed in a more\n\
21531 conversational style, when possible."),
21533 show_dwarf2_always_disassemble,
21534 &set_dwarf2_cmdlist,
21535 &show_dwarf2_cmdlist);
21537 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
21538 Set debugging of the dwarf2 reader."), _("\
21539 Show debugging of the dwarf2 reader."), _("\
21540 When enabled, debugging messages are printed during dwarf2 reading\n\
21541 and symtab expansion."),
21544 &setdebuglist, &showdebuglist);
21546 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
21547 Set debugging of the dwarf2 DIE reader."), _("\
21548 Show debugging of the dwarf2 DIE reader."), _("\
21549 When enabled (non-zero), DIEs are dumped after they are read in.\n\
21550 The value is the maximum depth to print."),
21553 &setdebuglist, &showdebuglist);
21555 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
21556 Set cross-checking of \"physname\" code against demangler."), _("\
21557 Show cross-checking of \"physname\" code against demangler."), _("\
21558 When enabled, GDB's internal \"physname\" code is checked against\n\
21560 NULL, show_check_physname,
21561 &setdebuglist, &showdebuglist);
21563 add_setshow_boolean_cmd ("use-deprecated-index-sections",
21564 no_class, &use_deprecated_index_sections, _("\
21565 Set whether to use deprecated gdb_index sections."), _("\
21566 Show whether to use deprecated gdb_index sections."), _("\
21567 When enabled, deprecated .gdb_index sections are used anyway.\n\
21568 Normally they are ignored either because of a missing feature or\n\
21569 performance issue.\n\
21570 Warning: This option must be enabled before gdb reads the file."),
21573 &setlist, &showlist);
21575 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
21577 Save a gdb-index file.\n\
21578 Usage: save gdb-index DIRECTORY"),
21580 set_cmd_completer (c, filename_completer);
21582 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
21583 &dwarf2_locexpr_funcs);
21584 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
21585 &dwarf2_loclist_funcs);
21587 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
21588 &dwarf2_block_frame_base_locexpr_funcs);
21589 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
21590 &dwarf2_block_frame_base_loclist_funcs);