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, *free_cu_cleanup = NULL;
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 free_cu_cleanup = 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. */
5206 if (free_cu_cleanup != NULL)
5210 /* We've successfully allocated this compilation unit. Let our
5211 caller clean it up when finished with it. */
5212 discard_cleanups (free_cu_cleanup);
5214 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5215 So we have to manually free the abbrev table. */
5216 dwarf2_free_abbrev_table (cu);
5218 /* Link this CU into read_in_chain. */
5219 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5220 dwarf2_per_objfile->read_in_chain = this_cu;
5223 do_cleanups (free_cu_cleanup);
5226 do_cleanups (cleanups);
5229 /* Read CU/TU THIS_CU in section SECTION,
5230 but do not follow DW_AT_GNU_dwo_name if present.
5231 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
5232 to have already done the lookup to find the DWO/DWP file).
5234 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5235 THIS_CU->is_debug_types, but nothing else.
5237 We fill in THIS_CU->length.
5239 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5240 linker) then DIE_READER_FUNC will not get called.
5242 THIS_CU->cu is always freed when done.
5243 This is done in order to not leave THIS_CU->cu in a state where we have
5244 to care whether it refers to the "main" CU or the DWO CU. */
5247 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5248 struct dwarf2_section_info *abbrev_section,
5249 struct dwo_file *dwo_file,
5250 die_reader_func_ftype *die_reader_func,
5253 struct objfile *objfile = dwarf2_per_objfile->objfile;
5254 struct dwarf2_section_info *section = this_cu->section;
5255 bfd *abfd = section->asection->owner;
5256 struct dwarf2_cu cu;
5257 const gdb_byte *begin_info_ptr, *info_ptr;
5258 struct die_reader_specs reader;
5259 struct cleanup *cleanups;
5260 struct die_info *comp_unit_die;
5263 if (dwarf2_die_debug)
5264 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5265 this_cu->is_debug_types ? "type" : "comp",
5266 this_cu->offset.sect_off);
5268 gdb_assert (this_cu->cu == NULL);
5270 /* This is cheap if the section is already read in. */
5271 dwarf2_read_section (objfile, section);
5273 init_one_comp_unit (&cu, this_cu);
5275 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5277 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5278 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5279 abbrev_section, info_ptr,
5280 this_cu->is_debug_types);
5282 this_cu->length = get_cu_length (&cu.header);
5284 /* Skip dummy compilation units. */
5285 if (info_ptr >= begin_info_ptr + this_cu->length
5286 || peek_abbrev_code (abfd, info_ptr) == 0)
5288 do_cleanups (cleanups);
5292 dwarf2_read_abbrevs (&cu, abbrev_section);
5293 make_cleanup (dwarf2_free_abbrev_table, &cu);
5295 init_cu_die_reader (&reader, &cu, section, dwo_file);
5296 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5298 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5300 do_cleanups (cleanups);
5303 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5304 does not lookup the specified DWO file.
5305 This cannot be used to read DWO files.
5307 THIS_CU->cu is always freed when done.
5308 This is done in order to not leave THIS_CU->cu in a state where we have
5309 to care whether it refers to the "main" CU or the DWO CU.
5310 We can revisit this if the data shows there's a performance issue. */
5313 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5314 die_reader_func_ftype *die_reader_func,
5317 init_cutu_and_read_dies_no_follow (this_cu,
5318 get_abbrev_section_for_cu (this_cu),
5320 die_reader_func, data);
5323 /* Type Unit Groups.
5325 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5326 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5327 so that all types coming from the same compilation (.o file) are grouped
5328 together. A future step could be to put the types in the same symtab as
5329 the CU the types ultimately came from. */
5332 hash_type_unit_group (const void *item)
5334 const struct type_unit_group *tu_group = item;
5336 return hash_stmt_list_entry (&tu_group->hash);
5340 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5342 const struct type_unit_group *lhs = item_lhs;
5343 const struct type_unit_group *rhs = item_rhs;
5345 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5348 /* Allocate a hash table for type unit groups. */
5351 allocate_type_unit_groups_table (void)
5353 return htab_create_alloc_ex (3,
5354 hash_type_unit_group,
5357 &dwarf2_per_objfile->objfile->objfile_obstack,
5358 hashtab_obstack_allocate,
5359 dummy_obstack_deallocate);
5362 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5363 partial symtabs. We combine several TUs per psymtab to not let the size
5364 of any one psymtab grow too big. */
5365 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5366 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5368 /* Helper routine for get_type_unit_group.
5369 Create the type_unit_group object used to hold one or more TUs. */
5371 static struct type_unit_group *
5372 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5374 struct objfile *objfile = dwarf2_per_objfile->objfile;
5375 struct dwarf2_per_cu_data *per_cu;
5376 struct type_unit_group *tu_group;
5378 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5379 struct type_unit_group);
5380 per_cu = &tu_group->per_cu;
5381 per_cu->objfile = objfile;
5383 if (dwarf2_per_objfile->using_index)
5385 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5386 struct dwarf2_per_cu_quick_data);
5390 unsigned int line_offset = line_offset_struct.sect_off;
5391 struct partial_symtab *pst;
5394 /* Give the symtab a useful name for debug purposes. */
5395 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5396 name = xstrprintf ("<type_units_%d>",
5397 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5399 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5401 pst = create_partial_symtab (per_cu, name);
5407 tu_group->hash.dwo_unit = cu->dwo_unit;
5408 tu_group->hash.line_offset = line_offset_struct;
5413 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5414 STMT_LIST is a DW_AT_stmt_list attribute. */
5416 static struct type_unit_group *
5417 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5419 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5420 struct type_unit_group *tu_group;
5422 unsigned int line_offset;
5423 struct type_unit_group type_unit_group_for_lookup;
5425 if (dwarf2_per_objfile->type_unit_groups == NULL)
5427 dwarf2_per_objfile->type_unit_groups =
5428 allocate_type_unit_groups_table ();
5431 /* Do we need to create a new group, or can we use an existing one? */
5435 line_offset = DW_UNSND (stmt_list);
5436 ++tu_stats->nr_symtab_sharers;
5440 /* Ugh, no stmt_list. Rare, but we have to handle it.
5441 We can do various things here like create one group per TU or
5442 spread them over multiple groups to split up the expansion work.
5443 To avoid worst case scenarios (too many groups or too large groups)
5444 we, umm, group them in bunches. */
5445 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5446 | (tu_stats->nr_stmt_less_type_units
5447 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5448 ++tu_stats->nr_stmt_less_type_units;
5451 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5452 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5453 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5454 &type_unit_group_for_lookup, INSERT);
5458 gdb_assert (tu_group != NULL);
5462 sect_offset line_offset_struct;
5464 line_offset_struct.sect_off = line_offset;
5465 tu_group = create_type_unit_group (cu, line_offset_struct);
5467 ++tu_stats->nr_symtabs;
5473 /* Struct used to sort TUs by their abbreviation table offset. */
5475 struct tu_abbrev_offset
5477 struct signatured_type *sig_type;
5478 sect_offset abbrev_offset;
5481 /* Helper routine for build_type_unit_groups, passed to qsort. */
5484 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5486 const struct tu_abbrev_offset * const *a = ap;
5487 const struct tu_abbrev_offset * const *b = bp;
5488 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5489 unsigned int boff = (*b)->abbrev_offset.sect_off;
5491 return (aoff > boff) - (aoff < boff);
5494 /* A helper function to add a type_unit_group to a table. */
5497 add_type_unit_group_to_table (void **slot, void *datum)
5499 struct type_unit_group *tu_group = *slot;
5500 struct type_unit_group ***datap = datum;
5508 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5509 each one passing FUNC,DATA.
5511 The efficiency is because we sort TUs by the abbrev table they use and
5512 only read each abbrev table once. In one program there are 200K TUs
5513 sharing 8K abbrev tables.
5515 The main purpose of this function is to support building the
5516 dwarf2_per_objfile->type_unit_groups table.
5517 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5518 can collapse the search space by grouping them by stmt_list.
5519 The savings can be significant, in the same program from above the 200K TUs
5520 share 8K stmt_list tables.
5522 FUNC is expected to call get_type_unit_group, which will create the
5523 struct type_unit_group if necessary and add it to
5524 dwarf2_per_objfile->type_unit_groups. */
5527 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5529 struct objfile *objfile = dwarf2_per_objfile->objfile;
5530 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5531 struct cleanup *cleanups;
5532 struct abbrev_table *abbrev_table;
5533 sect_offset abbrev_offset;
5534 struct tu_abbrev_offset *sorted_by_abbrev;
5535 struct type_unit_group **iter;
5538 /* It's up to the caller to not call us multiple times. */
5539 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5541 if (dwarf2_per_objfile->n_type_units == 0)
5544 /* TUs typically share abbrev tables, and there can be way more TUs than
5545 abbrev tables. Sort by abbrev table to reduce the number of times we
5546 read each abbrev table in.
5547 Alternatives are to punt or to maintain a cache of abbrev tables.
5548 This is simpler and efficient enough for now.
5550 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5551 symtab to use). Typically TUs with the same abbrev offset have the same
5552 stmt_list value too so in practice this should work well.
5554 The basic algorithm here is:
5556 sort TUs by abbrev table
5557 for each TU with same abbrev table:
5558 read abbrev table if first user
5559 read TU top level DIE
5560 [IWBN if DWO skeletons had DW_AT_stmt_list]
5563 if (dwarf2_read_debug)
5564 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5566 /* Sort in a separate table to maintain the order of all_type_units
5567 for .gdb_index: TU indices directly index all_type_units. */
5568 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5569 dwarf2_per_objfile->n_type_units);
5570 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5572 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5574 sorted_by_abbrev[i].sig_type = sig_type;
5575 sorted_by_abbrev[i].abbrev_offset =
5576 read_abbrev_offset (sig_type->per_cu.section,
5577 sig_type->per_cu.offset);
5579 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5580 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5581 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5583 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5584 called any number of times, so we don't reset tu_stats here. */
5586 abbrev_offset.sect_off = ~(unsigned) 0;
5587 abbrev_table = NULL;
5588 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5590 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5592 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5594 /* Switch to the next abbrev table if necessary. */
5595 if (abbrev_table == NULL
5596 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5598 if (abbrev_table != NULL)
5600 abbrev_table_free (abbrev_table);
5601 /* Reset to NULL in case abbrev_table_read_table throws
5602 an error: abbrev_table_free_cleanup will get called. */
5603 abbrev_table = NULL;
5605 abbrev_offset = tu->abbrev_offset;
5607 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5609 ++tu_stats->nr_uniq_abbrev_tables;
5612 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5616 /* type_unit_groups can be NULL if there is an error in the debug info.
5617 Just create an empty table so the rest of gdb doesn't have to watch
5618 for this error case. */
5619 if (dwarf2_per_objfile->type_unit_groups == NULL)
5621 dwarf2_per_objfile->type_unit_groups =
5622 allocate_type_unit_groups_table ();
5623 dwarf2_per_objfile->n_type_unit_groups = 0;
5626 /* Create a vector of pointers to primary type units to make it easy to
5627 iterate over them and CUs. See dw2_get_primary_cu. */
5628 dwarf2_per_objfile->n_type_unit_groups =
5629 htab_elements (dwarf2_per_objfile->type_unit_groups);
5630 dwarf2_per_objfile->all_type_unit_groups =
5631 obstack_alloc (&objfile->objfile_obstack,
5632 dwarf2_per_objfile->n_type_unit_groups
5633 * sizeof (struct type_unit_group *));
5634 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5635 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5636 add_type_unit_group_to_table, &iter);
5637 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5638 == dwarf2_per_objfile->n_type_unit_groups);
5640 do_cleanups (cleanups);
5642 if (dwarf2_read_debug)
5644 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5645 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5646 dwarf2_per_objfile->n_type_units);
5647 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5648 tu_stats->nr_uniq_abbrev_tables);
5649 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5650 tu_stats->nr_symtabs);
5651 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5652 tu_stats->nr_symtab_sharers);
5653 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5654 tu_stats->nr_stmt_less_type_units);
5658 /* Partial symbol tables. */
5660 /* Create a psymtab named NAME and assign it to PER_CU.
5662 The caller must fill in the following details:
5663 dirname, textlow, texthigh. */
5665 static struct partial_symtab *
5666 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5668 struct objfile *objfile = per_cu->objfile;
5669 struct partial_symtab *pst;
5671 pst = start_psymtab_common (objfile, objfile->section_offsets,
5673 objfile->global_psymbols.next,
5674 objfile->static_psymbols.next);
5676 pst->psymtabs_addrmap_supported = 1;
5678 /* This is the glue that links PST into GDB's symbol API. */
5679 pst->read_symtab_private = per_cu;
5680 pst->read_symtab = dwarf2_read_symtab;
5681 per_cu->v.psymtab = pst;
5686 /* die_reader_func for process_psymtab_comp_unit. */
5689 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5690 const gdb_byte *info_ptr,
5691 struct die_info *comp_unit_die,
5695 struct dwarf2_cu *cu = reader->cu;
5696 struct objfile *objfile = cu->objfile;
5697 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5698 struct attribute *attr;
5700 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5701 struct partial_symtab *pst;
5703 const char *filename;
5704 int *want_partial_unit_ptr = data;
5706 if (comp_unit_die->tag == DW_TAG_partial_unit
5707 && (want_partial_unit_ptr == NULL
5708 || !*want_partial_unit_ptr))
5711 gdb_assert (! per_cu->is_debug_types);
5713 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5715 cu->list_in_scope = &file_symbols;
5717 /* Allocate a new partial symbol table structure. */
5718 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5719 if (attr == NULL || !DW_STRING (attr))
5722 filename = DW_STRING (attr);
5724 pst = create_partial_symtab (per_cu, filename);
5726 /* This must be done before calling dwarf2_build_include_psymtabs. */
5727 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5729 pst->dirname = DW_STRING (attr);
5731 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5733 dwarf2_find_base_address (comp_unit_die, cu);
5735 /* Possibly set the default values of LOWPC and HIGHPC from
5737 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5738 &best_highpc, cu, pst);
5739 if (has_pc_info == 1 && best_lowpc < best_highpc)
5740 /* Store the contiguous range if it is not empty; it can be empty for
5741 CUs with no code. */
5742 addrmap_set_empty (objfile->psymtabs_addrmap,
5743 best_lowpc + baseaddr,
5744 best_highpc + baseaddr - 1, pst);
5746 /* Check if comp unit has_children.
5747 If so, read the rest of the partial symbols from this comp unit.
5748 If not, there's no more debug_info for this comp unit. */
5751 struct partial_die_info *first_die;
5752 CORE_ADDR lowpc, highpc;
5754 lowpc = ((CORE_ADDR) -1);
5755 highpc = ((CORE_ADDR) 0);
5757 first_die = load_partial_dies (reader, info_ptr, 1);
5759 scan_partial_symbols (first_die, &lowpc, &highpc,
5762 /* If we didn't find a lowpc, set it to highpc to avoid
5763 complaints from `maint check'. */
5764 if (lowpc == ((CORE_ADDR) -1))
5767 /* If the compilation unit didn't have an explicit address range,
5768 then use the information extracted from its child dies. */
5772 best_highpc = highpc;
5775 pst->textlow = best_lowpc + baseaddr;
5776 pst->texthigh = best_highpc + baseaddr;
5778 pst->n_global_syms = objfile->global_psymbols.next -
5779 (objfile->global_psymbols.list + pst->globals_offset);
5780 pst->n_static_syms = objfile->static_psymbols.next -
5781 (objfile->static_psymbols.list + pst->statics_offset);
5782 sort_pst_symbols (objfile, pst);
5784 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5787 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5788 struct dwarf2_per_cu_data *iter;
5790 /* Fill in 'dependencies' here; we fill in 'users' in a
5792 pst->number_of_dependencies = len;
5793 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5794 len * sizeof (struct symtab *));
5796 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5799 pst->dependencies[i] = iter->v.psymtab;
5801 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5804 /* Get the list of files included in the current compilation unit,
5805 and build a psymtab for each of them. */
5806 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5808 if (dwarf2_read_debug)
5810 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5812 fprintf_unfiltered (gdb_stdlog,
5813 "Psymtab for %s unit @0x%x: %s - %s"
5814 ", %d global, %d static syms\n",
5815 per_cu->is_debug_types ? "type" : "comp",
5816 per_cu->offset.sect_off,
5817 paddress (gdbarch, pst->textlow),
5818 paddress (gdbarch, pst->texthigh),
5819 pst->n_global_syms, pst->n_static_syms);
5823 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5824 Process compilation unit THIS_CU for a psymtab. */
5827 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5828 int want_partial_unit)
5830 /* If this compilation unit was already read in, free the
5831 cached copy in order to read it in again. This is
5832 necessary because we skipped some symbols when we first
5833 read in the compilation unit (see load_partial_dies).
5834 This problem could be avoided, but the benefit is unclear. */
5835 if (this_cu->cu != NULL)
5836 free_one_cached_comp_unit (this_cu);
5838 gdb_assert (! this_cu->is_debug_types);
5839 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5840 process_psymtab_comp_unit_reader,
5841 &want_partial_unit);
5843 /* Age out any secondary CUs. */
5844 age_cached_comp_units ();
5847 /* Reader function for build_type_psymtabs. */
5850 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5851 const gdb_byte *info_ptr,
5852 struct die_info *type_unit_die,
5856 struct objfile *objfile = dwarf2_per_objfile->objfile;
5857 struct dwarf2_cu *cu = reader->cu;
5858 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5859 struct signatured_type *sig_type;
5860 struct type_unit_group *tu_group;
5861 struct attribute *attr;
5862 struct partial_die_info *first_die;
5863 CORE_ADDR lowpc, highpc;
5864 struct partial_symtab *pst;
5866 gdb_assert (data == NULL);
5867 gdb_assert (per_cu->is_debug_types);
5868 sig_type = (struct signatured_type *) per_cu;
5873 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5874 tu_group = get_type_unit_group (cu, attr);
5876 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5878 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5879 cu->list_in_scope = &file_symbols;
5880 pst = create_partial_symtab (per_cu, "");
5883 first_die = load_partial_dies (reader, info_ptr, 1);
5885 lowpc = (CORE_ADDR) -1;
5886 highpc = (CORE_ADDR) 0;
5887 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5889 pst->n_global_syms = objfile->global_psymbols.next -
5890 (objfile->global_psymbols.list + pst->globals_offset);
5891 pst->n_static_syms = objfile->static_psymbols.next -
5892 (objfile->static_psymbols.list + pst->statics_offset);
5893 sort_pst_symbols (objfile, pst);
5896 /* Traversal function for build_type_psymtabs. */
5899 build_type_psymtab_dependencies (void **slot, void *info)
5901 struct objfile *objfile = dwarf2_per_objfile->objfile;
5902 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5903 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5904 struct partial_symtab *pst = per_cu->v.psymtab;
5905 int len = VEC_length (sig_type_ptr, tu_group->tus);
5906 struct signatured_type *iter;
5909 gdb_assert (len > 0);
5910 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5912 pst->number_of_dependencies = len;
5913 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5914 len * sizeof (struct psymtab *));
5916 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5919 gdb_assert (iter->per_cu.is_debug_types);
5920 pst->dependencies[i] = iter->per_cu.v.psymtab;
5921 iter->type_unit_group = tu_group;
5924 VEC_free (sig_type_ptr, tu_group->tus);
5929 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5930 Build partial symbol tables for the .debug_types comp-units. */
5933 build_type_psymtabs (struct objfile *objfile)
5935 if (! create_all_type_units (objfile))
5938 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5940 /* Now that all TUs have been processed we can fill in the dependencies. */
5941 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5942 build_type_psymtab_dependencies, NULL);
5945 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5948 psymtabs_addrmap_cleanup (void *o)
5950 struct objfile *objfile = o;
5952 objfile->psymtabs_addrmap = NULL;
5955 /* Compute the 'user' field for each psymtab in OBJFILE. */
5958 set_partial_user (struct objfile *objfile)
5962 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5964 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5965 struct partial_symtab *pst = per_cu->v.psymtab;
5971 for (j = 0; j < pst->number_of_dependencies; ++j)
5973 /* Set the 'user' field only if it is not already set. */
5974 if (pst->dependencies[j]->user == NULL)
5975 pst->dependencies[j]->user = pst;
5980 /* Build the partial symbol table by doing a quick pass through the
5981 .debug_info and .debug_abbrev sections. */
5984 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5986 struct cleanup *back_to, *addrmap_cleanup;
5987 struct obstack temp_obstack;
5990 if (dwarf2_read_debug)
5992 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5996 dwarf2_per_objfile->reading_partial_symbols = 1;
5998 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6000 /* Any cached compilation units will be linked by the per-objfile
6001 read_in_chain. Make sure to free them when we're done. */
6002 back_to = make_cleanup (free_cached_comp_units, NULL);
6004 build_type_psymtabs (objfile);
6006 create_all_comp_units (objfile);
6008 /* Create a temporary address map on a temporary obstack. We later
6009 copy this to the final obstack. */
6010 obstack_init (&temp_obstack);
6011 make_cleanup_obstack_free (&temp_obstack);
6012 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6013 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6015 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6017 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6019 process_psymtab_comp_unit (per_cu, 0);
6022 set_partial_user (objfile);
6024 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6025 &objfile->objfile_obstack);
6026 discard_cleanups (addrmap_cleanup);
6028 do_cleanups (back_to);
6030 if (dwarf2_read_debug)
6031 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6035 /* die_reader_func for load_partial_comp_unit. */
6038 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6039 const gdb_byte *info_ptr,
6040 struct die_info *comp_unit_die,
6044 struct dwarf2_cu *cu = reader->cu;
6046 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6048 /* Check if comp unit has_children.
6049 If so, read the rest of the partial symbols from this comp unit.
6050 If not, there's no more debug_info for this comp unit. */
6052 load_partial_dies (reader, info_ptr, 0);
6055 /* Load the partial DIEs for a secondary CU into memory.
6056 This is also used when rereading a primary CU with load_all_dies. */
6059 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6061 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6062 load_partial_comp_unit_reader, NULL);
6066 read_comp_units_from_section (struct objfile *objfile,
6067 struct dwarf2_section_info *section,
6068 unsigned int is_dwz,
6071 struct dwarf2_per_cu_data ***all_comp_units)
6073 const gdb_byte *info_ptr;
6074 bfd *abfd = section->asection->owner;
6076 if (dwarf2_read_debug)
6077 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6078 section->asection->name, bfd_get_filename (abfd));
6080 dwarf2_read_section (objfile, section);
6082 info_ptr = section->buffer;
6084 while (info_ptr < section->buffer + section->size)
6086 unsigned int length, initial_length_size;
6087 struct dwarf2_per_cu_data *this_cu;
6090 offset.sect_off = info_ptr - section->buffer;
6092 /* Read just enough information to find out where the next
6093 compilation unit is. */
6094 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6096 /* Save the compilation unit for later lookup. */
6097 this_cu = obstack_alloc (&objfile->objfile_obstack,
6098 sizeof (struct dwarf2_per_cu_data));
6099 memset (this_cu, 0, sizeof (*this_cu));
6100 this_cu->offset = offset;
6101 this_cu->length = length + initial_length_size;
6102 this_cu->is_dwz = is_dwz;
6103 this_cu->objfile = objfile;
6104 this_cu->section = section;
6106 if (*n_comp_units == *n_allocated)
6109 *all_comp_units = xrealloc (*all_comp_units,
6111 * sizeof (struct dwarf2_per_cu_data *));
6113 (*all_comp_units)[*n_comp_units] = this_cu;
6116 info_ptr = info_ptr + this_cu->length;
6120 /* Create a list of all compilation units in OBJFILE.
6121 This is only done for -readnow and building partial symtabs. */
6124 create_all_comp_units (struct objfile *objfile)
6128 struct dwarf2_per_cu_data **all_comp_units;
6129 struct dwz_file *dwz;
6133 all_comp_units = xmalloc (n_allocated
6134 * sizeof (struct dwarf2_per_cu_data *));
6136 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6137 &n_allocated, &n_comp_units, &all_comp_units);
6139 dwz = dwarf2_get_dwz_file ();
6141 read_comp_units_from_section (objfile, &dwz->info, 1,
6142 &n_allocated, &n_comp_units,
6145 dwarf2_per_objfile->all_comp_units
6146 = obstack_alloc (&objfile->objfile_obstack,
6147 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6148 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6149 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6150 xfree (all_comp_units);
6151 dwarf2_per_objfile->n_comp_units = n_comp_units;
6154 /* Process all loaded DIEs for compilation unit CU, starting at
6155 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6156 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6157 DW_AT_ranges). If NEED_PC is set, then this function will set
6158 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6159 and record the covered ranges in the addrmap. */
6162 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6163 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6165 struct partial_die_info *pdi;
6167 /* Now, march along the PDI's, descending into ones which have
6168 interesting children but skipping the children of the other ones,
6169 until we reach the end of the compilation unit. */
6175 fixup_partial_die (pdi, cu);
6177 /* Anonymous namespaces or modules have no name but have interesting
6178 children, so we need to look at them. Ditto for anonymous
6181 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6182 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6183 || pdi->tag == DW_TAG_imported_unit)
6187 case DW_TAG_subprogram:
6188 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6190 case DW_TAG_constant:
6191 case DW_TAG_variable:
6192 case DW_TAG_typedef:
6193 case DW_TAG_union_type:
6194 if (!pdi->is_declaration)
6196 add_partial_symbol (pdi, cu);
6199 case DW_TAG_class_type:
6200 case DW_TAG_interface_type:
6201 case DW_TAG_structure_type:
6202 if (!pdi->is_declaration)
6204 add_partial_symbol (pdi, cu);
6207 case DW_TAG_enumeration_type:
6208 if (!pdi->is_declaration)
6209 add_partial_enumeration (pdi, cu);
6211 case DW_TAG_base_type:
6212 case DW_TAG_subrange_type:
6213 /* File scope base type definitions are added to the partial
6215 add_partial_symbol (pdi, cu);
6217 case DW_TAG_namespace:
6218 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6221 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6223 case DW_TAG_imported_unit:
6225 struct dwarf2_per_cu_data *per_cu;
6227 /* For now we don't handle imported units in type units. */
6228 if (cu->per_cu->is_debug_types)
6230 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6231 " supported in type units [in module %s]"),
6235 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6239 /* Go read the partial unit, if needed. */
6240 if (per_cu->v.psymtab == NULL)
6241 process_psymtab_comp_unit (per_cu, 1);
6243 VEC_safe_push (dwarf2_per_cu_ptr,
6244 cu->per_cu->imported_symtabs, per_cu);
6252 /* If the die has a sibling, skip to the sibling. */
6254 pdi = pdi->die_sibling;
6258 /* Functions used to compute the fully scoped name of a partial DIE.
6260 Normally, this is simple. For C++, the parent DIE's fully scoped
6261 name is concatenated with "::" and the partial DIE's name. For
6262 Java, the same thing occurs except that "." is used instead of "::".
6263 Enumerators are an exception; they use the scope of their parent
6264 enumeration type, i.e. the name of the enumeration type is not
6265 prepended to the enumerator.
6267 There are two complexities. One is DW_AT_specification; in this
6268 case "parent" means the parent of the target of the specification,
6269 instead of the direct parent of the DIE. The other is compilers
6270 which do not emit DW_TAG_namespace; in this case we try to guess
6271 the fully qualified name of structure types from their members'
6272 linkage names. This must be done using the DIE's children rather
6273 than the children of any DW_AT_specification target. We only need
6274 to do this for structures at the top level, i.e. if the target of
6275 any DW_AT_specification (if any; otherwise the DIE itself) does not
6278 /* Compute the scope prefix associated with PDI's parent, in
6279 compilation unit CU. The result will be allocated on CU's
6280 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6281 field. NULL is returned if no prefix is necessary. */
6283 partial_die_parent_scope (struct partial_die_info *pdi,
6284 struct dwarf2_cu *cu)
6286 const char *grandparent_scope;
6287 struct partial_die_info *parent, *real_pdi;
6289 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6290 then this means the parent of the specification DIE. */
6293 while (real_pdi->has_specification)
6294 real_pdi = find_partial_die (real_pdi->spec_offset,
6295 real_pdi->spec_is_dwz, cu);
6297 parent = real_pdi->die_parent;
6301 if (parent->scope_set)
6302 return parent->scope;
6304 fixup_partial_die (parent, cu);
6306 grandparent_scope = partial_die_parent_scope (parent, cu);
6308 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6309 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6310 Work around this problem here. */
6311 if (cu->language == language_cplus
6312 && parent->tag == DW_TAG_namespace
6313 && strcmp (parent->name, "::") == 0
6314 && grandparent_scope == NULL)
6316 parent->scope = NULL;
6317 parent->scope_set = 1;
6321 if (pdi->tag == DW_TAG_enumerator)
6322 /* Enumerators should not get the name of the enumeration as a prefix. */
6323 parent->scope = grandparent_scope;
6324 else if (parent->tag == DW_TAG_namespace
6325 || parent->tag == DW_TAG_module
6326 || parent->tag == DW_TAG_structure_type
6327 || parent->tag == DW_TAG_class_type
6328 || parent->tag == DW_TAG_interface_type
6329 || parent->tag == DW_TAG_union_type
6330 || parent->tag == DW_TAG_enumeration_type)
6332 if (grandparent_scope == NULL)
6333 parent->scope = parent->name;
6335 parent->scope = typename_concat (&cu->comp_unit_obstack,
6337 parent->name, 0, cu);
6341 /* FIXME drow/2004-04-01: What should we be doing with
6342 function-local names? For partial symbols, we should probably be
6344 complaint (&symfile_complaints,
6345 _("unhandled containing DIE tag %d for DIE at %d"),
6346 parent->tag, pdi->offset.sect_off);
6347 parent->scope = grandparent_scope;
6350 parent->scope_set = 1;
6351 return parent->scope;
6354 /* Return the fully scoped name associated with PDI, from compilation unit
6355 CU. The result will be allocated with malloc. */
6358 partial_die_full_name (struct partial_die_info *pdi,
6359 struct dwarf2_cu *cu)
6361 const char *parent_scope;
6363 /* If this is a template instantiation, we can not work out the
6364 template arguments from partial DIEs. So, unfortunately, we have
6365 to go through the full DIEs. At least any work we do building
6366 types here will be reused if full symbols are loaded later. */
6367 if (pdi->has_template_arguments)
6369 fixup_partial_die (pdi, cu);
6371 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6373 struct die_info *die;
6374 struct attribute attr;
6375 struct dwarf2_cu *ref_cu = cu;
6377 /* DW_FORM_ref_addr is using section offset. */
6379 attr.form = DW_FORM_ref_addr;
6380 attr.u.unsnd = pdi->offset.sect_off;
6381 die = follow_die_ref (NULL, &attr, &ref_cu);
6383 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6387 parent_scope = partial_die_parent_scope (pdi, cu);
6388 if (parent_scope == NULL)
6391 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6395 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6397 struct objfile *objfile = cu->objfile;
6399 const char *actual_name = NULL;
6401 char *built_actual_name;
6403 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6405 built_actual_name = partial_die_full_name (pdi, cu);
6406 if (built_actual_name != NULL)
6407 actual_name = built_actual_name;
6409 if (actual_name == NULL)
6410 actual_name = pdi->name;
6414 case DW_TAG_subprogram:
6415 if (pdi->is_external || cu->language == language_ada)
6417 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6418 of the global scope. But in Ada, we want to be able to access
6419 nested procedures globally. So all Ada subprograms are stored
6420 in the global scope. */
6421 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6422 mst_text, objfile); */
6423 add_psymbol_to_list (actual_name, strlen (actual_name),
6424 built_actual_name != NULL,
6425 VAR_DOMAIN, LOC_BLOCK,
6426 &objfile->global_psymbols,
6427 0, pdi->lowpc + baseaddr,
6428 cu->language, objfile);
6432 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6433 mst_file_text, objfile); */
6434 add_psymbol_to_list (actual_name, strlen (actual_name),
6435 built_actual_name != NULL,
6436 VAR_DOMAIN, LOC_BLOCK,
6437 &objfile->static_psymbols,
6438 0, pdi->lowpc + baseaddr,
6439 cu->language, objfile);
6442 case DW_TAG_constant:
6444 struct psymbol_allocation_list *list;
6446 if (pdi->is_external)
6447 list = &objfile->global_psymbols;
6449 list = &objfile->static_psymbols;
6450 add_psymbol_to_list (actual_name, strlen (actual_name),
6451 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6452 list, 0, 0, cu->language, objfile);
6455 case DW_TAG_variable:
6457 addr = decode_locdesc (pdi->d.locdesc, cu);
6461 && !dwarf2_per_objfile->has_section_at_zero)
6463 /* A global or static variable may also have been stripped
6464 out by the linker if unused, in which case its address
6465 will be nullified; do not add such variables into partial
6466 symbol table then. */
6468 else if (pdi->is_external)
6471 Don't enter into the minimal symbol tables as there is
6472 a minimal symbol table entry from the ELF symbols already.
6473 Enter into partial symbol table if it has a location
6474 descriptor or a type.
6475 If the location descriptor is missing, new_symbol will create
6476 a LOC_UNRESOLVED symbol, the address of the variable will then
6477 be determined from the minimal symbol table whenever the variable
6479 The address for the partial symbol table entry is not
6480 used by GDB, but it comes in handy for debugging partial symbol
6483 if (pdi->d.locdesc || pdi->has_type)
6484 add_psymbol_to_list (actual_name, strlen (actual_name),
6485 built_actual_name != NULL,
6486 VAR_DOMAIN, LOC_STATIC,
6487 &objfile->global_psymbols,
6489 cu->language, objfile);
6493 /* Static Variable. Skip symbols without location descriptors. */
6494 if (pdi->d.locdesc == NULL)
6496 xfree (built_actual_name);
6499 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6500 mst_file_data, objfile); */
6501 add_psymbol_to_list (actual_name, strlen (actual_name),
6502 built_actual_name != NULL,
6503 VAR_DOMAIN, LOC_STATIC,
6504 &objfile->static_psymbols,
6506 cu->language, objfile);
6509 case DW_TAG_typedef:
6510 case DW_TAG_base_type:
6511 case DW_TAG_subrange_type:
6512 add_psymbol_to_list (actual_name, strlen (actual_name),
6513 built_actual_name != NULL,
6514 VAR_DOMAIN, LOC_TYPEDEF,
6515 &objfile->static_psymbols,
6516 0, (CORE_ADDR) 0, cu->language, objfile);
6518 case DW_TAG_namespace:
6519 add_psymbol_to_list (actual_name, strlen (actual_name),
6520 built_actual_name != NULL,
6521 VAR_DOMAIN, LOC_TYPEDEF,
6522 &objfile->global_psymbols,
6523 0, (CORE_ADDR) 0, cu->language, objfile);
6525 case DW_TAG_class_type:
6526 case DW_TAG_interface_type:
6527 case DW_TAG_structure_type:
6528 case DW_TAG_union_type:
6529 case DW_TAG_enumeration_type:
6530 /* Skip external references. The DWARF standard says in the section
6531 about "Structure, Union, and Class Type Entries": "An incomplete
6532 structure, union or class type is represented by a structure,
6533 union or class entry that does not have a byte size attribute
6534 and that has a DW_AT_declaration attribute." */
6535 if (!pdi->has_byte_size && pdi->is_declaration)
6537 xfree (built_actual_name);
6541 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6542 static vs. global. */
6543 add_psymbol_to_list (actual_name, strlen (actual_name),
6544 built_actual_name != NULL,
6545 STRUCT_DOMAIN, LOC_TYPEDEF,
6546 (cu->language == language_cplus
6547 || cu->language == language_java)
6548 ? &objfile->global_psymbols
6549 : &objfile->static_psymbols,
6550 0, (CORE_ADDR) 0, cu->language, objfile);
6553 case DW_TAG_enumerator:
6554 add_psymbol_to_list (actual_name, strlen (actual_name),
6555 built_actual_name != NULL,
6556 VAR_DOMAIN, LOC_CONST,
6557 (cu->language == language_cplus
6558 || cu->language == language_java)
6559 ? &objfile->global_psymbols
6560 : &objfile->static_psymbols,
6561 0, (CORE_ADDR) 0, cu->language, objfile);
6567 xfree (built_actual_name);
6570 /* Read a partial die corresponding to a namespace; also, add a symbol
6571 corresponding to that namespace to the symbol table. NAMESPACE is
6572 the name of the enclosing namespace. */
6575 add_partial_namespace (struct partial_die_info *pdi,
6576 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6577 int need_pc, struct dwarf2_cu *cu)
6579 /* Add a symbol for the namespace. */
6581 add_partial_symbol (pdi, cu);
6583 /* Now scan partial symbols in that namespace. */
6585 if (pdi->has_children)
6586 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6589 /* Read a partial die corresponding to a Fortran module. */
6592 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6593 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6595 /* Now scan partial symbols in that module. */
6597 if (pdi->has_children)
6598 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6601 /* Read a partial die corresponding to a subprogram and create a partial
6602 symbol for that subprogram. When the CU language allows it, this
6603 routine also defines a partial symbol for each nested subprogram
6604 that this subprogram contains.
6606 DIE my also be a lexical block, in which case we simply search
6607 recursively for suprograms defined inside that lexical block.
6608 Again, this is only performed when the CU language allows this
6609 type of definitions. */
6612 add_partial_subprogram (struct partial_die_info *pdi,
6613 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6614 int need_pc, struct dwarf2_cu *cu)
6616 if (pdi->tag == DW_TAG_subprogram)
6618 if (pdi->has_pc_info)
6620 if (pdi->lowpc < *lowpc)
6621 *lowpc = pdi->lowpc;
6622 if (pdi->highpc > *highpc)
6623 *highpc = pdi->highpc;
6627 struct objfile *objfile = cu->objfile;
6629 baseaddr = ANOFFSET (objfile->section_offsets,
6630 SECT_OFF_TEXT (objfile));
6631 addrmap_set_empty (objfile->psymtabs_addrmap,
6632 pdi->lowpc + baseaddr,
6633 pdi->highpc - 1 + baseaddr,
6634 cu->per_cu->v.psymtab);
6638 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6640 if (!pdi->is_declaration)
6641 /* Ignore subprogram DIEs that do not have a name, they are
6642 illegal. Do not emit a complaint at this point, we will
6643 do so when we convert this psymtab into a symtab. */
6645 add_partial_symbol (pdi, cu);
6649 if (! pdi->has_children)
6652 if (cu->language == language_ada)
6654 pdi = pdi->die_child;
6657 fixup_partial_die (pdi, cu);
6658 if (pdi->tag == DW_TAG_subprogram
6659 || pdi->tag == DW_TAG_lexical_block)
6660 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6661 pdi = pdi->die_sibling;
6666 /* Read a partial die corresponding to an enumeration type. */
6669 add_partial_enumeration (struct partial_die_info *enum_pdi,
6670 struct dwarf2_cu *cu)
6672 struct partial_die_info *pdi;
6674 if (enum_pdi->name != NULL)
6675 add_partial_symbol (enum_pdi, cu);
6677 pdi = enum_pdi->die_child;
6680 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6681 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6683 add_partial_symbol (pdi, cu);
6684 pdi = pdi->die_sibling;
6688 /* Return the initial uleb128 in the die at INFO_PTR. */
6691 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6693 unsigned int bytes_read;
6695 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6698 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6699 Return the corresponding abbrev, or NULL if the number is zero (indicating
6700 an empty DIE). In either case *BYTES_READ will be set to the length of
6701 the initial number. */
6703 static struct abbrev_info *
6704 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6705 struct dwarf2_cu *cu)
6707 bfd *abfd = cu->objfile->obfd;
6708 unsigned int abbrev_number;
6709 struct abbrev_info *abbrev;
6711 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6713 if (abbrev_number == 0)
6716 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6719 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6720 abbrev_number, bfd_get_filename (abfd));
6726 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6727 Returns a pointer to the end of a series of DIEs, terminated by an empty
6728 DIE. Any children of the skipped DIEs will also be skipped. */
6730 static const gdb_byte *
6731 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6733 struct dwarf2_cu *cu = reader->cu;
6734 struct abbrev_info *abbrev;
6735 unsigned int bytes_read;
6739 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6741 return info_ptr + bytes_read;
6743 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6747 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6748 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6749 abbrev corresponding to that skipped uleb128 should be passed in
6750 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6753 static const gdb_byte *
6754 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6755 struct abbrev_info *abbrev)
6757 unsigned int bytes_read;
6758 struct attribute attr;
6759 bfd *abfd = reader->abfd;
6760 struct dwarf2_cu *cu = reader->cu;
6761 const gdb_byte *buffer = reader->buffer;
6762 const gdb_byte *buffer_end = reader->buffer_end;
6763 const gdb_byte *start_info_ptr = info_ptr;
6764 unsigned int form, i;
6766 for (i = 0; i < abbrev->num_attrs; i++)
6768 /* The only abbrev we care about is DW_AT_sibling. */
6769 if (abbrev->attrs[i].name == DW_AT_sibling)
6771 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6772 if (attr.form == DW_FORM_ref_addr)
6773 complaint (&symfile_complaints,
6774 _("ignoring absolute DW_AT_sibling"));
6776 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6779 /* If it isn't DW_AT_sibling, skip this attribute. */
6780 form = abbrev->attrs[i].form;
6784 case DW_FORM_ref_addr:
6785 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6786 and later it is offset sized. */
6787 if (cu->header.version == 2)
6788 info_ptr += cu->header.addr_size;
6790 info_ptr += cu->header.offset_size;
6792 case DW_FORM_GNU_ref_alt:
6793 info_ptr += cu->header.offset_size;
6796 info_ptr += cu->header.addr_size;
6803 case DW_FORM_flag_present:
6815 case DW_FORM_ref_sig8:
6818 case DW_FORM_string:
6819 read_direct_string (abfd, info_ptr, &bytes_read);
6820 info_ptr += bytes_read;
6822 case DW_FORM_sec_offset:
6824 case DW_FORM_GNU_strp_alt:
6825 info_ptr += cu->header.offset_size;
6827 case DW_FORM_exprloc:
6829 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6830 info_ptr += bytes_read;
6832 case DW_FORM_block1:
6833 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6835 case DW_FORM_block2:
6836 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6838 case DW_FORM_block4:
6839 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6843 case DW_FORM_ref_udata:
6844 case DW_FORM_GNU_addr_index:
6845 case DW_FORM_GNU_str_index:
6846 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6848 case DW_FORM_indirect:
6849 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6850 info_ptr += bytes_read;
6851 /* We need to continue parsing from here, so just go back to
6853 goto skip_attribute;
6856 error (_("Dwarf Error: Cannot handle %s "
6857 "in DWARF reader [in module %s]"),
6858 dwarf_form_name (form),
6859 bfd_get_filename (abfd));
6863 if (abbrev->has_children)
6864 return skip_children (reader, info_ptr);
6869 /* Locate ORIG_PDI's sibling.
6870 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6872 static const gdb_byte *
6873 locate_pdi_sibling (const struct die_reader_specs *reader,
6874 struct partial_die_info *orig_pdi,
6875 const gdb_byte *info_ptr)
6877 /* Do we know the sibling already? */
6879 if (orig_pdi->sibling)
6880 return orig_pdi->sibling;
6882 /* Are there any children to deal with? */
6884 if (!orig_pdi->has_children)
6887 /* Skip the children the long way. */
6889 return skip_children (reader, info_ptr);
6892 /* Expand this partial symbol table into a full symbol table. SELF is
6896 dwarf2_read_symtab (struct partial_symtab *self,
6897 struct objfile *objfile)
6901 warning (_("bug: psymtab for %s is already read in."),
6908 printf_filtered (_("Reading in symbols for %s..."),
6910 gdb_flush (gdb_stdout);
6913 /* Restore our global data. */
6914 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6916 /* If this psymtab is constructed from a debug-only objfile, the
6917 has_section_at_zero flag will not necessarily be correct. We
6918 can get the correct value for this flag by looking at the data
6919 associated with the (presumably stripped) associated objfile. */
6920 if (objfile->separate_debug_objfile_backlink)
6922 struct dwarf2_per_objfile *dpo_backlink
6923 = objfile_data (objfile->separate_debug_objfile_backlink,
6924 dwarf2_objfile_data_key);
6926 dwarf2_per_objfile->has_section_at_zero
6927 = dpo_backlink->has_section_at_zero;
6930 dwarf2_per_objfile->reading_partial_symbols = 0;
6932 psymtab_to_symtab_1 (self);
6934 /* Finish up the debug error message. */
6936 printf_filtered (_("done.\n"));
6939 process_cu_includes ();
6942 /* Reading in full CUs. */
6944 /* Add PER_CU to the queue. */
6947 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6948 enum language pretend_language)
6950 struct dwarf2_queue_item *item;
6953 item = xmalloc (sizeof (*item));
6954 item->per_cu = per_cu;
6955 item->pretend_language = pretend_language;
6958 if (dwarf2_queue == NULL)
6959 dwarf2_queue = item;
6961 dwarf2_queue_tail->next = item;
6963 dwarf2_queue_tail = item;
6966 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6967 unit and add it to our queue.
6968 The result is non-zero if PER_CU was queued, otherwise the result is zero
6969 meaning either PER_CU is already queued or it is already loaded. */
6972 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6973 struct dwarf2_per_cu_data *per_cu,
6974 enum language pretend_language)
6976 /* We may arrive here during partial symbol reading, if we need full
6977 DIEs to process an unusual case (e.g. template arguments). Do
6978 not queue PER_CU, just tell our caller to load its DIEs. */
6979 if (dwarf2_per_objfile->reading_partial_symbols)
6981 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6986 /* Mark the dependence relation so that we don't flush PER_CU
6988 dwarf2_add_dependence (this_cu, per_cu);
6990 /* If it's already on the queue, we have nothing to do. */
6994 /* If the compilation unit is already loaded, just mark it as
6996 if (per_cu->cu != NULL)
6998 per_cu->cu->last_used = 0;
7002 /* Add it to the queue. */
7003 queue_comp_unit (per_cu, pretend_language);
7008 /* Process the queue. */
7011 process_queue (void)
7013 struct dwarf2_queue_item *item, *next_item;
7015 if (dwarf2_read_debug)
7017 fprintf_unfiltered (gdb_stdlog,
7018 "Expanding one or more symtabs of objfile %s ...\n",
7019 dwarf2_per_objfile->objfile->name);
7022 /* The queue starts out with one item, but following a DIE reference
7023 may load a new CU, adding it to the end of the queue. */
7024 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7026 if (dwarf2_per_objfile->using_index
7027 ? !item->per_cu->v.quick->symtab
7028 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7030 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7032 if (dwarf2_read_debug)
7034 fprintf_unfiltered (gdb_stdlog,
7035 "Expanding symtab of %s at offset 0x%x\n",
7036 per_cu->is_debug_types ? "TU" : "CU",
7037 per_cu->offset.sect_off);
7040 if (per_cu->is_debug_types)
7041 process_full_type_unit (per_cu, item->pretend_language);
7043 process_full_comp_unit (per_cu, item->pretend_language);
7045 if (dwarf2_read_debug)
7047 fprintf_unfiltered (gdb_stdlog,
7048 "Done expanding %s at offset 0x%x\n",
7049 per_cu->is_debug_types ? "TU" : "CU",
7050 per_cu->offset.sect_off);
7054 item->per_cu->queued = 0;
7055 next_item = item->next;
7059 dwarf2_queue_tail = NULL;
7061 if (dwarf2_read_debug)
7063 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7064 dwarf2_per_objfile->objfile->name);
7068 /* Free all allocated queue entries. This function only releases anything if
7069 an error was thrown; if the queue was processed then it would have been
7070 freed as we went along. */
7073 dwarf2_release_queue (void *dummy)
7075 struct dwarf2_queue_item *item, *last;
7077 item = dwarf2_queue;
7080 /* Anything still marked queued is likely to be in an
7081 inconsistent state, so discard it. */
7082 if (item->per_cu->queued)
7084 if (item->per_cu->cu != NULL)
7085 free_one_cached_comp_unit (item->per_cu);
7086 item->per_cu->queued = 0;
7094 dwarf2_queue = dwarf2_queue_tail = NULL;
7097 /* Read in full symbols for PST, and anything it depends on. */
7100 psymtab_to_symtab_1 (struct partial_symtab *pst)
7102 struct dwarf2_per_cu_data *per_cu;
7108 for (i = 0; i < pst->number_of_dependencies; i++)
7109 if (!pst->dependencies[i]->readin
7110 && pst->dependencies[i]->user == NULL)
7112 /* Inform about additional files that need to be read in. */
7115 /* FIXME: i18n: Need to make this a single string. */
7116 fputs_filtered (" ", gdb_stdout);
7118 fputs_filtered ("and ", gdb_stdout);
7120 printf_filtered ("%s...", pst->dependencies[i]->filename);
7121 wrap_here (""); /* Flush output. */
7122 gdb_flush (gdb_stdout);
7124 psymtab_to_symtab_1 (pst->dependencies[i]);
7127 per_cu = pst->read_symtab_private;
7131 /* It's an include file, no symbols to read for it.
7132 Everything is in the parent symtab. */
7137 dw2_do_instantiate_symtab (per_cu);
7140 /* Trivial hash function for die_info: the hash value of a DIE
7141 is its offset in .debug_info for this objfile. */
7144 die_hash (const void *item)
7146 const struct die_info *die = item;
7148 return die->offset.sect_off;
7151 /* Trivial comparison function for die_info structures: two DIEs
7152 are equal if they have the same offset. */
7155 die_eq (const void *item_lhs, const void *item_rhs)
7157 const struct die_info *die_lhs = item_lhs;
7158 const struct die_info *die_rhs = item_rhs;
7160 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7163 /* die_reader_func for load_full_comp_unit.
7164 This is identical to read_signatured_type_reader,
7165 but is kept separate for now. */
7168 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7169 const gdb_byte *info_ptr,
7170 struct die_info *comp_unit_die,
7174 struct dwarf2_cu *cu = reader->cu;
7175 enum language *language_ptr = data;
7177 gdb_assert (cu->die_hash == NULL);
7179 htab_create_alloc_ex (cu->header.length / 12,
7183 &cu->comp_unit_obstack,
7184 hashtab_obstack_allocate,
7185 dummy_obstack_deallocate);
7188 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7189 &info_ptr, comp_unit_die);
7190 cu->dies = comp_unit_die;
7191 /* comp_unit_die is not stored in die_hash, no need. */
7193 /* We try not to read any attributes in this function, because not
7194 all CUs needed for references have been loaded yet, and symbol
7195 table processing isn't initialized. But we have to set the CU language,
7196 or we won't be able to build types correctly.
7197 Similarly, if we do not read the producer, we can not apply
7198 producer-specific interpretation. */
7199 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7202 /* Load the DIEs associated with PER_CU into memory. */
7205 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7206 enum language pretend_language)
7208 gdb_assert (! this_cu->is_debug_types);
7210 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7211 load_full_comp_unit_reader, &pretend_language);
7214 /* Add a DIE to the delayed physname list. */
7217 add_to_method_list (struct type *type, int fnfield_index, int index,
7218 const char *name, struct die_info *die,
7219 struct dwarf2_cu *cu)
7221 struct delayed_method_info mi;
7223 mi.fnfield_index = fnfield_index;
7227 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7230 /* A cleanup for freeing the delayed method list. */
7233 free_delayed_list (void *ptr)
7235 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7236 if (cu->method_list != NULL)
7238 VEC_free (delayed_method_info, cu->method_list);
7239 cu->method_list = NULL;
7243 /* Compute the physnames of any methods on the CU's method list.
7245 The computation of method physnames is delayed in order to avoid the
7246 (bad) condition that one of the method's formal parameters is of an as yet
7250 compute_delayed_physnames (struct dwarf2_cu *cu)
7253 struct delayed_method_info *mi;
7254 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7256 const char *physname;
7257 struct fn_fieldlist *fn_flp
7258 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7259 physname = dwarf2_physname (mi->name, mi->die, cu);
7260 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7264 /* Go objects should be embedded in a DW_TAG_module DIE,
7265 and it's not clear if/how imported objects will appear.
7266 To keep Go support simple until that's worked out,
7267 go back through what we've read and create something usable.
7268 We could do this while processing each DIE, and feels kinda cleaner,
7269 but that way is more invasive.
7270 This is to, for example, allow the user to type "p var" or "b main"
7271 without having to specify the package name, and allow lookups
7272 of module.object to work in contexts that use the expression
7276 fixup_go_packaging (struct dwarf2_cu *cu)
7278 char *package_name = NULL;
7279 struct pending *list;
7282 for (list = global_symbols; list != NULL; list = list->next)
7284 for (i = 0; i < list->nsyms; ++i)
7286 struct symbol *sym = list->symbol[i];
7288 if (SYMBOL_LANGUAGE (sym) == language_go
7289 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7291 char *this_package_name = go_symbol_package_name (sym);
7293 if (this_package_name == NULL)
7295 if (package_name == NULL)
7296 package_name = this_package_name;
7299 if (strcmp (package_name, this_package_name) != 0)
7300 complaint (&symfile_complaints,
7301 _("Symtab %s has objects from two different Go packages: %s and %s"),
7302 (SYMBOL_SYMTAB (sym)
7303 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7304 : cu->objfile->name),
7305 this_package_name, package_name);
7306 xfree (this_package_name);
7312 if (package_name != NULL)
7314 struct objfile *objfile = cu->objfile;
7315 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7317 strlen (package_name));
7318 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7319 saved_package_name, objfile);
7322 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7324 sym = allocate_symbol (objfile);
7325 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7326 SYMBOL_SET_NAMES (sym, saved_package_name,
7327 strlen (saved_package_name), 0, objfile);
7328 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7329 e.g., "main" finds the "main" module and not C's main(). */
7330 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7331 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7332 SYMBOL_TYPE (sym) = type;
7334 add_symbol_to_list (sym, &global_symbols);
7336 xfree (package_name);
7340 /* Return the symtab for PER_CU. This works properly regardless of
7341 whether we're using the index or psymtabs. */
7343 static struct symtab *
7344 get_symtab (struct dwarf2_per_cu_data *per_cu)
7346 return (dwarf2_per_objfile->using_index
7347 ? per_cu->v.quick->symtab
7348 : per_cu->v.psymtab->symtab);
7351 /* A helper function for computing the list of all symbol tables
7352 included by PER_CU. */
7355 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
7356 htab_t all_children,
7357 struct dwarf2_per_cu_data *per_cu)
7361 struct dwarf2_per_cu_data *iter;
7363 slot = htab_find_slot (all_children, per_cu, INSERT);
7366 /* This inclusion and its children have been processed. */
7371 /* Only add a CU if it has a symbol table. */
7372 if (get_symtab (per_cu) != NULL)
7373 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
7376 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7378 recursively_compute_inclusions (result, all_children, iter);
7381 /* Compute the symtab 'includes' fields for the symtab related to
7385 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7387 gdb_assert (! per_cu->is_debug_types);
7389 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7392 struct dwarf2_per_cu_data *iter;
7393 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
7394 htab_t all_children;
7395 struct symtab *symtab = get_symtab (per_cu);
7397 /* If we don't have a symtab, we can just skip this case. */
7401 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7402 NULL, xcalloc, xfree);
7405 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7408 recursively_compute_inclusions (&result_children, all_children, iter);
7410 /* Now we have a transitive closure of all the included CUs, and
7411 for .gdb_index version 7 the included TUs, so we can convert it
7412 to a list of symtabs. */
7413 len = VEC_length (dwarf2_per_cu_ptr, result_children);
7415 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7416 (len + 1) * sizeof (struct symtab *));
7418 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
7420 symtab->includes[ix] = get_symtab (iter);
7421 symtab->includes[len] = NULL;
7423 VEC_free (dwarf2_per_cu_ptr, result_children);
7424 htab_delete (all_children);
7428 /* Compute the 'includes' field for the symtabs of all the CUs we just
7432 process_cu_includes (void)
7435 struct dwarf2_per_cu_data *iter;
7438 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7442 if (! iter->is_debug_types)
7443 compute_symtab_includes (iter);
7446 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7449 /* Generate full symbol information for PER_CU, whose DIEs have
7450 already been loaded into memory. */
7453 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7454 enum language pretend_language)
7456 struct dwarf2_cu *cu = per_cu->cu;
7457 struct objfile *objfile = per_cu->objfile;
7458 CORE_ADDR lowpc, highpc;
7459 struct symtab *symtab;
7460 struct cleanup *back_to, *delayed_list_cleanup;
7462 struct block *static_block;
7464 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7467 back_to = make_cleanup (really_free_pendings, NULL);
7468 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7470 cu->list_in_scope = &file_symbols;
7472 cu->language = pretend_language;
7473 cu->language_defn = language_def (cu->language);
7475 /* Do line number decoding in read_file_scope () */
7476 process_die (cu->dies, cu);
7478 /* For now fudge the Go package. */
7479 if (cu->language == language_go)
7480 fixup_go_packaging (cu);
7482 /* Now that we have processed all the DIEs in the CU, all the types
7483 should be complete, and it should now be safe to compute all of the
7485 compute_delayed_physnames (cu);
7486 do_cleanups (delayed_list_cleanup);
7488 /* Some compilers don't define a DW_AT_high_pc attribute for the
7489 compilation unit. If the DW_AT_high_pc is missing, synthesize
7490 it, by scanning the DIE's below the compilation unit. */
7491 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7494 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7496 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7497 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7498 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7499 addrmap to help ensure it has an accurate map of pc values belonging to
7501 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7503 symtab = end_symtab_from_static_block (static_block, objfile,
7504 SECT_OFF_TEXT (objfile), 0);
7508 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7510 /* Set symtab language to language from DW_AT_language. If the
7511 compilation is from a C file generated by language preprocessors, do
7512 not set the language if it was already deduced by start_subfile. */
7513 if (!(cu->language == language_c && symtab->language != language_c))
7514 symtab->language = cu->language;
7516 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7517 produce DW_AT_location with location lists but it can be possibly
7518 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7519 there were bugs in prologue debug info, fixed later in GCC-4.5
7520 by "unwind info for epilogues" patch (which is not directly related).
7522 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7523 needed, it would be wrong due to missing DW_AT_producer there.
7525 Still one can confuse GDB by using non-standard GCC compilation
7526 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7528 if (cu->has_loclist && gcc_4_minor >= 5)
7529 symtab->locations_valid = 1;
7531 if (gcc_4_minor >= 5)
7532 symtab->epilogue_unwind_valid = 1;
7534 symtab->call_site_htab = cu->call_site_htab;
7537 if (dwarf2_per_objfile->using_index)
7538 per_cu->v.quick->symtab = symtab;
7541 struct partial_symtab *pst = per_cu->v.psymtab;
7542 pst->symtab = symtab;
7546 /* Push it for inclusion processing later. */
7547 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7549 do_cleanups (back_to);
7552 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7553 already been loaded into memory. */
7556 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7557 enum language pretend_language)
7559 struct dwarf2_cu *cu = per_cu->cu;
7560 struct objfile *objfile = per_cu->objfile;
7561 struct symtab *symtab;
7562 struct cleanup *back_to, *delayed_list_cleanup;
7563 struct signatured_type *sig_type;
7565 gdb_assert (per_cu->is_debug_types);
7566 sig_type = (struct signatured_type *) per_cu;
7569 back_to = make_cleanup (really_free_pendings, NULL);
7570 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7572 cu->list_in_scope = &file_symbols;
7574 cu->language = pretend_language;
7575 cu->language_defn = language_def (cu->language);
7577 /* The symbol tables are set up in read_type_unit_scope. */
7578 process_die (cu->dies, cu);
7580 /* For now fudge the Go package. */
7581 if (cu->language == language_go)
7582 fixup_go_packaging (cu);
7584 /* Now that we have processed all the DIEs in the CU, all the types
7585 should be complete, and it should now be safe to compute all of the
7587 compute_delayed_physnames (cu);
7588 do_cleanups (delayed_list_cleanup);
7590 /* TUs share symbol tables.
7591 If this is the first TU to use this symtab, complete the construction
7592 of it with end_expandable_symtab. Otherwise, complete the addition of
7593 this TU's symbols to the existing symtab. */
7594 if (sig_type->type_unit_group->primary_symtab == NULL)
7596 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7597 sig_type->type_unit_group->primary_symtab = symtab;
7601 /* Set symtab language to language from DW_AT_language. If the
7602 compilation is from a C file generated by language preprocessors,
7603 do not set the language if it was already deduced by
7605 if (!(cu->language == language_c && symtab->language != language_c))
7606 symtab->language = cu->language;
7611 augment_type_symtab (objfile,
7612 sig_type->type_unit_group->primary_symtab);
7613 symtab = sig_type->type_unit_group->primary_symtab;
7616 if (dwarf2_per_objfile->using_index)
7617 per_cu->v.quick->symtab = symtab;
7620 struct partial_symtab *pst = per_cu->v.psymtab;
7621 pst->symtab = symtab;
7625 do_cleanups (back_to);
7628 /* Process an imported unit DIE. */
7631 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7633 struct attribute *attr;
7635 /* For now we don't handle imported units in type units. */
7636 if (cu->per_cu->is_debug_types)
7638 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7639 " supported in type units [in module %s]"),
7643 attr = dwarf2_attr (die, DW_AT_import, cu);
7646 struct dwarf2_per_cu_data *per_cu;
7647 struct symtab *imported_symtab;
7651 offset = dwarf2_get_ref_die_offset (attr);
7652 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7653 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7655 /* Queue the unit, if needed. */
7656 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7657 load_full_comp_unit (per_cu, cu->language);
7659 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7664 /* Process a die and its children. */
7667 process_die (struct die_info *die, struct dwarf2_cu *cu)
7671 case DW_TAG_padding:
7673 case DW_TAG_compile_unit:
7674 case DW_TAG_partial_unit:
7675 read_file_scope (die, cu);
7677 case DW_TAG_type_unit:
7678 read_type_unit_scope (die, cu);
7680 case DW_TAG_subprogram:
7681 case DW_TAG_inlined_subroutine:
7682 read_func_scope (die, cu);
7684 case DW_TAG_lexical_block:
7685 case DW_TAG_try_block:
7686 case DW_TAG_catch_block:
7687 read_lexical_block_scope (die, cu);
7689 case DW_TAG_GNU_call_site:
7690 read_call_site_scope (die, cu);
7692 case DW_TAG_class_type:
7693 case DW_TAG_interface_type:
7694 case DW_TAG_structure_type:
7695 case DW_TAG_union_type:
7696 process_structure_scope (die, cu);
7698 case DW_TAG_enumeration_type:
7699 process_enumeration_scope (die, cu);
7702 /* These dies have a type, but processing them does not create
7703 a symbol or recurse to process the children. Therefore we can
7704 read them on-demand through read_type_die. */
7705 case DW_TAG_subroutine_type:
7706 case DW_TAG_set_type:
7707 case DW_TAG_array_type:
7708 case DW_TAG_pointer_type:
7709 case DW_TAG_ptr_to_member_type:
7710 case DW_TAG_reference_type:
7711 case DW_TAG_string_type:
7714 case DW_TAG_base_type:
7715 case DW_TAG_subrange_type:
7716 case DW_TAG_typedef:
7717 /* Add a typedef symbol for the type definition, if it has a
7719 new_symbol (die, read_type_die (die, cu), cu);
7721 case DW_TAG_common_block:
7722 read_common_block (die, cu);
7724 case DW_TAG_common_inclusion:
7726 case DW_TAG_namespace:
7727 cu->processing_has_namespace_info = 1;
7728 read_namespace (die, cu);
7731 cu->processing_has_namespace_info = 1;
7732 read_module (die, cu);
7734 case DW_TAG_imported_declaration:
7735 case DW_TAG_imported_module:
7736 cu->processing_has_namespace_info = 1;
7737 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7738 || cu->language != language_fortran))
7739 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7740 dwarf_tag_name (die->tag));
7741 read_import_statement (die, cu);
7744 case DW_TAG_imported_unit:
7745 process_imported_unit_die (die, cu);
7749 new_symbol (die, NULL, cu);
7754 /* DWARF name computation. */
7756 /* A helper function for dwarf2_compute_name which determines whether DIE
7757 needs to have the name of the scope prepended to the name listed in the
7761 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7763 struct attribute *attr;
7767 case DW_TAG_namespace:
7768 case DW_TAG_typedef:
7769 case DW_TAG_class_type:
7770 case DW_TAG_interface_type:
7771 case DW_TAG_structure_type:
7772 case DW_TAG_union_type:
7773 case DW_TAG_enumeration_type:
7774 case DW_TAG_enumerator:
7775 case DW_TAG_subprogram:
7779 case DW_TAG_variable:
7780 case DW_TAG_constant:
7781 /* We only need to prefix "globally" visible variables. These include
7782 any variable marked with DW_AT_external or any variable that
7783 lives in a namespace. [Variables in anonymous namespaces
7784 require prefixing, but they are not DW_AT_external.] */
7786 if (dwarf2_attr (die, DW_AT_specification, cu))
7788 struct dwarf2_cu *spec_cu = cu;
7790 return die_needs_namespace (die_specification (die, &spec_cu),
7794 attr = dwarf2_attr (die, DW_AT_external, cu);
7795 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7796 && die->parent->tag != DW_TAG_module)
7798 /* A variable in a lexical block of some kind does not need a
7799 namespace, even though in C++ such variables may be external
7800 and have a mangled name. */
7801 if (die->parent->tag == DW_TAG_lexical_block
7802 || die->parent->tag == DW_TAG_try_block
7803 || die->parent->tag == DW_TAG_catch_block
7804 || die->parent->tag == DW_TAG_subprogram)
7813 /* Retrieve the last character from a mem_file. */
7816 do_ui_file_peek_last (void *object, const char *buffer, long length)
7818 char *last_char_p = (char *) object;
7821 *last_char_p = buffer[length - 1];
7824 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7825 compute the physname for the object, which include a method's:
7826 - formal parameters (C++/Java),
7827 - receiver type (Go),
7828 - return type (Java).
7830 The term "physname" is a bit confusing.
7831 For C++, for example, it is the demangled name.
7832 For Go, for example, it's the mangled name.
7834 For Ada, return the DIE's linkage name rather than the fully qualified
7835 name. PHYSNAME is ignored..
7837 The result is allocated on the objfile_obstack and canonicalized. */
7840 dwarf2_compute_name (const char *name,
7841 struct die_info *die, struct dwarf2_cu *cu,
7844 struct objfile *objfile = cu->objfile;
7847 name = dwarf2_name (die, cu);
7849 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7850 compute it by typename_concat inside GDB. */
7851 if (cu->language == language_ada
7852 || (cu->language == language_fortran && physname))
7854 /* For Ada unit, we prefer the linkage name over the name, as
7855 the former contains the exported name, which the user expects
7856 to be able to reference. Ideally, we want the user to be able
7857 to reference this entity using either natural or linkage name,
7858 but we haven't started looking at this enhancement yet. */
7859 struct attribute *attr;
7861 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7863 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7864 if (attr && DW_STRING (attr))
7865 return DW_STRING (attr);
7868 /* These are the only languages we know how to qualify names in. */
7870 && (cu->language == language_cplus || cu->language == language_java
7871 || cu->language == language_fortran))
7873 if (die_needs_namespace (die, cu))
7877 struct ui_file *buf;
7879 prefix = determine_prefix (die, cu);
7880 buf = mem_fileopen ();
7881 if (*prefix != '\0')
7883 char *prefixed_name = typename_concat (NULL, prefix, name,
7886 fputs_unfiltered (prefixed_name, buf);
7887 xfree (prefixed_name);
7890 fputs_unfiltered (name, buf);
7892 /* Template parameters may be specified in the DIE's DW_AT_name, or
7893 as children with DW_TAG_template_type_param or
7894 DW_TAG_value_type_param. If the latter, add them to the name
7895 here. If the name already has template parameters, then
7896 skip this step; some versions of GCC emit both, and
7897 it is more efficient to use the pre-computed name.
7899 Something to keep in mind about this process: it is very
7900 unlikely, or in some cases downright impossible, to produce
7901 something that will match the mangled name of a function.
7902 If the definition of the function has the same debug info,
7903 we should be able to match up with it anyway. But fallbacks
7904 using the minimal symbol, for instance to find a method
7905 implemented in a stripped copy of libstdc++, will not work.
7906 If we do not have debug info for the definition, we will have to
7907 match them up some other way.
7909 When we do name matching there is a related problem with function
7910 templates; two instantiated function templates are allowed to
7911 differ only by their return types, which we do not add here. */
7913 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7915 struct attribute *attr;
7916 struct die_info *child;
7919 die->building_fullname = 1;
7921 for (child = die->child; child != NULL; child = child->sibling)
7925 const gdb_byte *bytes;
7926 struct dwarf2_locexpr_baton *baton;
7929 if (child->tag != DW_TAG_template_type_param
7930 && child->tag != DW_TAG_template_value_param)
7935 fputs_unfiltered ("<", buf);
7939 fputs_unfiltered (", ", buf);
7941 attr = dwarf2_attr (child, DW_AT_type, cu);
7944 complaint (&symfile_complaints,
7945 _("template parameter missing DW_AT_type"));
7946 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7949 type = die_type (child, cu);
7951 if (child->tag == DW_TAG_template_type_param)
7953 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7957 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7960 complaint (&symfile_complaints,
7961 _("template parameter missing "
7962 "DW_AT_const_value"));
7963 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7967 dwarf2_const_value_attr (attr, type, name,
7968 &cu->comp_unit_obstack, cu,
7969 &value, &bytes, &baton);
7971 if (TYPE_NOSIGN (type))
7972 /* GDB prints characters as NUMBER 'CHAR'. If that's
7973 changed, this can use value_print instead. */
7974 c_printchar (value, type, buf);
7977 struct value_print_options opts;
7980 v = dwarf2_evaluate_loc_desc (type, NULL,
7984 else if (bytes != NULL)
7986 v = allocate_value (type);
7987 memcpy (value_contents_writeable (v), bytes,
7988 TYPE_LENGTH (type));
7991 v = value_from_longest (type, value);
7993 /* Specify decimal so that we do not depend on
7995 get_formatted_print_options (&opts, 'd');
7997 value_print (v, buf, &opts);
8003 die->building_fullname = 0;
8007 /* Close the argument list, with a space if necessary
8008 (nested templates). */
8009 char last_char = '\0';
8010 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8011 if (last_char == '>')
8012 fputs_unfiltered (" >", buf);
8014 fputs_unfiltered (">", buf);
8018 /* For Java and C++ methods, append formal parameter type
8019 information, if PHYSNAME. */
8021 if (physname && die->tag == DW_TAG_subprogram
8022 && (cu->language == language_cplus
8023 || cu->language == language_java))
8025 struct type *type = read_type_die (die, cu);
8027 c_type_print_args (type, buf, 1, cu->language,
8028 &type_print_raw_options);
8030 if (cu->language == language_java)
8032 /* For java, we must append the return type to method
8034 if (die->tag == DW_TAG_subprogram)
8035 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8036 0, 0, &type_print_raw_options);
8038 else if (cu->language == language_cplus)
8040 /* Assume that an artificial first parameter is
8041 "this", but do not crash if it is not. RealView
8042 marks unnamed (and thus unused) parameters as
8043 artificial; there is no way to differentiate
8045 if (TYPE_NFIELDS (type) > 0
8046 && TYPE_FIELD_ARTIFICIAL (type, 0)
8047 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8048 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8050 fputs_unfiltered (" const", buf);
8054 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8056 ui_file_delete (buf);
8058 if (cu->language == language_cplus)
8061 = dwarf2_canonicalize_name (name, cu,
8062 &objfile->objfile_obstack);
8073 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8074 If scope qualifiers are appropriate they will be added. The result
8075 will be allocated on the objfile_obstack, or NULL if the DIE does
8076 not have a name. NAME may either be from a previous call to
8077 dwarf2_name or NULL.
8079 The output string will be canonicalized (if C++/Java). */
8082 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8084 return dwarf2_compute_name (name, die, cu, 0);
8087 /* Construct a physname for the given DIE in CU. NAME may either be
8088 from a previous call to dwarf2_name or NULL. The result will be
8089 allocated on the objfile_objstack or NULL if the DIE does not have a
8092 The output string will be canonicalized (if C++/Java). */
8095 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8097 struct objfile *objfile = cu->objfile;
8098 struct attribute *attr;
8099 const char *retval, *mangled = NULL, *canon = NULL;
8100 struct cleanup *back_to;
8103 /* In this case dwarf2_compute_name is just a shortcut not building anything
8105 if (!die_needs_namespace (die, cu))
8106 return dwarf2_compute_name (name, die, cu, 1);
8108 back_to = make_cleanup (null_cleanup, NULL);
8110 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8112 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8114 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8116 if (attr && DW_STRING (attr))
8120 mangled = DW_STRING (attr);
8122 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8123 type. It is easier for GDB users to search for such functions as
8124 `name(params)' than `long name(params)'. In such case the minimal
8125 symbol names do not match the full symbol names but for template
8126 functions there is never a need to look up their definition from their
8127 declaration so the only disadvantage remains the minimal symbol
8128 variant `long name(params)' does not have the proper inferior type.
8131 if (cu->language == language_go)
8133 /* This is a lie, but we already lie to the caller new_symbol_full.
8134 new_symbol_full assumes we return the mangled name.
8135 This just undoes that lie until things are cleaned up. */
8140 demangled = gdb_demangle (mangled,
8141 (DMGL_PARAMS | DMGL_ANSI
8142 | (cu->language == language_java
8143 ? DMGL_JAVA | DMGL_RET_POSTFIX
8148 make_cleanup (xfree, demangled);
8158 if (canon == NULL || check_physname)
8160 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8162 if (canon != NULL && strcmp (physname, canon) != 0)
8164 /* It may not mean a bug in GDB. The compiler could also
8165 compute DW_AT_linkage_name incorrectly. But in such case
8166 GDB would need to be bug-to-bug compatible. */
8168 complaint (&symfile_complaints,
8169 _("Computed physname <%s> does not match demangled <%s> "
8170 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8171 physname, canon, mangled, die->offset.sect_off, objfile->name);
8173 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8174 is available here - over computed PHYSNAME. It is safer
8175 against both buggy GDB and buggy compilers. */
8189 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8191 do_cleanups (back_to);
8195 /* Read the import statement specified by the given die and record it. */
8198 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8200 struct objfile *objfile = cu->objfile;
8201 struct attribute *import_attr;
8202 struct die_info *imported_die, *child_die;
8203 struct dwarf2_cu *imported_cu;
8204 const char *imported_name;
8205 const char *imported_name_prefix;
8206 const char *canonical_name;
8207 const char *import_alias;
8208 const char *imported_declaration = NULL;
8209 const char *import_prefix;
8210 VEC (const_char_ptr) *excludes = NULL;
8211 struct cleanup *cleanups;
8213 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8214 if (import_attr == NULL)
8216 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8217 dwarf_tag_name (die->tag));
8222 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8223 imported_name = dwarf2_name (imported_die, imported_cu);
8224 if (imported_name == NULL)
8226 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8228 The import in the following code:
8242 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8243 <52> DW_AT_decl_file : 1
8244 <53> DW_AT_decl_line : 6
8245 <54> DW_AT_import : <0x75>
8246 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8248 <5b> DW_AT_decl_file : 1
8249 <5c> DW_AT_decl_line : 2
8250 <5d> DW_AT_type : <0x6e>
8252 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8253 <76> DW_AT_byte_size : 4
8254 <77> DW_AT_encoding : 5 (signed)
8256 imports the wrong die ( 0x75 instead of 0x58 ).
8257 This case will be ignored until the gcc bug is fixed. */
8261 /* Figure out the local name after import. */
8262 import_alias = dwarf2_name (die, cu);
8264 /* Figure out where the statement is being imported to. */
8265 import_prefix = determine_prefix (die, cu);
8267 /* Figure out what the scope of the imported die is and prepend it
8268 to the name of the imported die. */
8269 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8271 if (imported_die->tag != DW_TAG_namespace
8272 && imported_die->tag != DW_TAG_module)
8274 imported_declaration = imported_name;
8275 canonical_name = imported_name_prefix;
8277 else if (strlen (imported_name_prefix) > 0)
8278 canonical_name = obconcat (&objfile->objfile_obstack,
8279 imported_name_prefix, "::", imported_name,
8282 canonical_name = imported_name;
8284 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8286 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8287 for (child_die = die->child; child_die && child_die->tag;
8288 child_die = sibling_die (child_die))
8290 /* DWARF-4: A Fortran use statement with a “rename list” may be
8291 represented by an imported module entry with an import attribute
8292 referring to the module and owned entries corresponding to those
8293 entities that are renamed as part of being imported. */
8295 if (child_die->tag != DW_TAG_imported_declaration)
8297 complaint (&symfile_complaints,
8298 _("child DW_TAG_imported_declaration expected "
8299 "- DIE at 0x%x [in module %s]"),
8300 child_die->offset.sect_off, objfile->name);
8304 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8305 if (import_attr == NULL)
8307 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8308 dwarf_tag_name (child_die->tag));
8313 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8315 imported_name = dwarf2_name (imported_die, imported_cu);
8316 if (imported_name == NULL)
8318 complaint (&symfile_complaints,
8319 _("child DW_TAG_imported_declaration has unknown "
8320 "imported name - DIE at 0x%x [in module %s]"),
8321 child_die->offset.sect_off, objfile->name);
8325 VEC_safe_push (const_char_ptr, excludes, imported_name);
8327 process_die (child_die, cu);
8330 cp_add_using_directive (import_prefix,
8333 imported_declaration,
8336 &objfile->objfile_obstack);
8338 do_cleanups (cleanups);
8341 /* Cleanup function for handle_DW_AT_stmt_list. */
8344 free_cu_line_header (void *arg)
8346 struct dwarf2_cu *cu = arg;
8348 free_line_header (cu->line_header);
8349 cu->line_header = NULL;
8352 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8353 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8354 this, it was first present in GCC release 4.3.0. */
8357 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8359 if (!cu->checked_producer)
8360 check_producer (cu);
8362 return cu->producer_is_gcc_lt_4_3;
8366 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8367 const char **name, const char **comp_dir)
8369 struct attribute *attr;
8374 /* Find the filename. Do not use dwarf2_name here, since the filename
8375 is not a source language identifier. */
8376 attr = dwarf2_attr (die, DW_AT_name, cu);
8379 *name = DW_STRING (attr);
8382 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8384 *comp_dir = DW_STRING (attr);
8385 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8386 && IS_ABSOLUTE_PATH (*name))
8388 char *d = ldirname (*name);
8392 make_cleanup (xfree, d);
8394 if (*comp_dir != NULL)
8396 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8397 directory, get rid of it. */
8398 char *cp = strchr (*comp_dir, ':');
8400 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8405 *name = "<unknown>";
8408 /* Handle DW_AT_stmt_list for a compilation unit.
8409 DIE is the DW_TAG_compile_unit die for CU.
8410 COMP_DIR is the compilation directory.
8411 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8414 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8415 const char *comp_dir) /* ARI: editCase function */
8417 struct attribute *attr;
8419 gdb_assert (! cu->per_cu->is_debug_types);
8421 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8424 unsigned int line_offset = DW_UNSND (attr);
8425 struct line_header *line_header
8426 = dwarf_decode_line_header (line_offset, cu);
8430 cu->line_header = line_header;
8431 make_cleanup (free_cu_line_header, cu);
8432 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8437 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8440 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8442 struct objfile *objfile = dwarf2_per_objfile->objfile;
8443 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8444 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8445 CORE_ADDR highpc = ((CORE_ADDR) 0);
8446 struct attribute *attr;
8447 const char *name = NULL;
8448 const char *comp_dir = NULL;
8449 struct die_info *child_die;
8450 bfd *abfd = objfile->obfd;
8453 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8455 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8457 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8458 from finish_block. */
8459 if (lowpc == ((CORE_ADDR) -1))
8464 find_file_and_directory (die, cu, &name, &comp_dir);
8466 prepare_one_comp_unit (cu, die, cu->language);
8468 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8469 standardised yet. As a workaround for the language detection we fall
8470 back to the DW_AT_producer string. */
8471 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8472 cu->language = language_opencl;
8474 /* Similar hack for Go. */
8475 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8476 set_cu_language (DW_LANG_Go, cu);
8478 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8480 /* Decode line number information if present. We do this before
8481 processing child DIEs, so that the line header table is available
8482 for DW_AT_decl_file. */
8483 handle_DW_AT_stmt_list (die, cu, comp_dir);
8485 /* Process all dies in compilation unit. */
8486 if (die->child != NULL)
8488 child_die = die->child;
8489 while (child_die && child_die->tag)
8491 process_die (child_die, cu);
8492 child_die = sibling_die (child_die);
8496 /* Decode macro information, if present. Dwarf 2 macro information
8497 refers to information in the line number info statement program
8498 header, so we can only read it if we've read the header
8500 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8501 if (attr && cu->line_header)
8503 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8504 complaint (&symfile_complaints,
8505 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8507 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8511 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8512 if (attr && cu->line_header)
8514 unsigned int macro_offset = DW_UNSND (attr);
8516 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8520 do_cleanups (back_to);
8523 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8524 Create the set of symtabs used by this TU, or if this TU is sharing
8525 symtabs with another TU and the symtabs have already been created
8526 then restore those symtabs in the line header.
8527 We don't need the pc/line-number mapping for type units. */
8530 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8532 struct objfile *objfile = dwarf2_per_objfile->objfile;
8533 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8534 struct type_unit_group *tu_group;
8536 struct line_header *lh;
8537 struct attribute *attr;
8538 unsigned int i, line_offset;
8539 struct signatured_type *sig_type;
8541 gdb_assert (per_cu->is_debug_types);
8542 sig_type = (struct signatured_type *) per_cu;
8544 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8546 /* If we're using .gdb_index (includes -readnow) then
8547 per_cu->type_unit_group may not have been set up yet. */
8548 if (sig_type->type_unit_group == NULL)
8549 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8550 tu_group = sig_type->type_unit_group;
8552 /* If we've already processed this stmt_list there's no real need to
8553 do it again, we could fake it and just recreate the part we need
8554 (file name,index -> symtab mapping). If data shows this optimization
8555 is useful we can do it then. */
8556 first_time = tu_group->primary_symtab == NULL;
8558 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8563 line_offset = DW_UNSND (attr);
8564 lh = dwarf_decode_line_header (line_offset, cu);
8569 dwarf2_start_symtab (cu, "", NULL, 0);
8572 gdb_assert (tu_group->symtabs == NULL);
8575 /* Note: The primary symtab will get allocated at the end. */
8579 cu->line_header = lh;
8580 make_cleanup (free_cu_line_header, cu);
8584 dwarf2_start_symtab (cu, "", NULL, 0);
8586 tu_group->num_symtabs = lh->num_file_names;
8587 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8589 for (i = 0; i < lh->num_file_names; ++i)
8591 const char *dir = NULL;
8592 struct file_entry *fe = &lh->file_names[i];
8595 dir = lh->include_dirs[fe->dir_index - 1];
8596 dwarf2_start_subfile (fe->name, dir, NULL);
8598 /* Note: We don't have to watch for the main subfile here, type units
8599 don't have DW_AT_name. */
8601 if (current_subfile->symtab == NULL)
8603 /* NOTE: start_subfile will recognize when it's been passed
8604 a file it has already seen. So we can't assume there's a
8605 simple mapping from lh->file_names to subfiles,
8606 lh->file_names may contain dups. */
8607 current_subfile->symtab = allocate_symtab (current_subfile->name,
8611 fe->symtab = current_subfile->symtab;
8612 tu_group->symtabs[i] = fe->symtab;
8619 for (i = 0; i < lh->num_file_names; ++i)
8621 struct file_entry *fe = &lh->file_names[i];
8623 fe->symtab = tu_group->symtabs[i];
8627 /* The main symtab is allocated last. Type units don't have DW_AT_name
8628 so they don't have a "real" (so to speak) symtab anyway.
8629 There is later code that will assign the main symtab to all symbols
8630 that don't have one. We need to handle the case of a symbol with a
8631 missing symtab (DW_AT_decl_file) anyway. */
8634 /* Process DW_TAG_type_unit.
8635 For TUs we want to skip the first top level sibling if it's not the
8636 actual type being defined by this TU. In this case the first top
8637 level sibling is there to provide context only. */
8640 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8642 struct die_info *child_die;
8644 prepare_one_comp_unit (cu, die, language_minimal);
8646 /* Initialize (or reinitialize) the machinery for building symtabs.
8647 We do this before processing child DIEs, so that the line header table
8648 is available for DW_AT_decl_file. */
8649 setup_type_unit_groups (die, cu);
8651 if (die->child != NULL)
8653 child_die = die->child;
8654 while (child_die && child_die->tag)
8656 process_die (child_die, cu);
8657 child_die = sibling_die (child_die);
8664 http://gcc.gnu.org/wiki/DebugFission
8665 http://gcc.gnu.org/wiki/DebugFissionDWP
8667 To simplify handling of both DWO files ("object" files with the DWARF info)
8668 and DWP files (a file with the DWOs packaged up into one file), we treat
8669 DWP files as having a collection of virtual DWO files. */
8672 hash_dwo_file (const void *item)
8674 const struct dwo_file *dwo_file = item;
8677 hash = htab_hash_string (dwo_file->dwo_name);
8678 if (dwo_file->comp_dir != NULL)
8679 hash += htab_hash_string (dwo_file->comp_dir);
8684 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8686 const struct dwo_file *lhs = item_lhs;
8687 const struct dwo_file *rhs = item_rhs;
8689 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
8691 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
8692 return lhs->comp_dir == rhs->comp_dir;
8693 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
8696 /* Allocate a hash table for DWO files. */
8699 allocate_dwo_file_hash_table (void)
8701 struct objfile *objfile = dwarf2_per_objfile->objfile;
8703 return htab_create_alloc_ex (41,
8707 &objfile->objfile_obstack,
8708 hashtab_obstack_allocate,
8709 dummy_obstack_deallocate);
8712 /* Lookup DWO file DWO_NAME. */
8715 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8717 struct dwo_file find_entry;
8720 if (dwarf2_per_objfile->dwo_files == NULL)
8721 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8723 memset (&find_entry, 0, sizeof (find_entry));
8724 find_entry.dwo_name = dwo_name;
8725 find_entry.comp_dir = comp_dir;
8726 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8732 hash_dwo_unit (const void *item)
8734 const struct dwo_unit *dwo_unit = item;
8736 /* This drops the top 32 bits of the id, but is ok for a hash. */
8737 return dwo_unit->signature;
8741 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8743 const struct dwo_unit *lhs = item_lhs;
8744 const struct dwo_unit *rhs = item_rhs;
8746 /* The signature is assumed to be unique within the DWO file.
8747 So while object file CU dwo_id's always have the value zero,
8748 that's OK, assuming each object file DWO file has only one CU,
8749 and that's the rule for now. */
8750 return lhs->signature == rhs->signature;
8753 /* Allocate a hash table for DWO CUs,TUs.
8754 There is one of these tables for each of CUs,TUs for each DWO file. */
8757 allocate_dwo_unit_table (struct objfile *objfile)
8759 /* Start out with a pretty small number.
8760 Generally DWO files contain only one CU and maybe some TUs. */
8761 return htab_create_alloc_ex (3,
8765 &objfile->objfile_obstack,
8766 hashtab_obstack_allocate,
8767 dummy_obstack_deallocate);
8770 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8772 struct create_dwo_cu_data
8774 struct dwo_file *dwo_file;
8775 struct dwo_unit dwo_unit;
8778 /* die_reader_func for create_dwo_cu. */
8781 create_dwo_cu_reader (const struct die_reader_specs *reader,
8782 const gdb_byte *info_ptr,
8783 struct die_info *comp_unit_die,
8787 struct dwarf2_cu *cu = reader->cu;
8788 struct objfile *objfile = dwarf2_per_objfile->objfile;
8789 sect_offset offset = cu->per_cu->offset;
8790 struct dwarf2_section_info *section = cu->per_cu->section;
8791 struct create_dwo_cu_data *data = datap;
8792 struct dwo_file *dwo_file = data->dwo_file;
8793 struct dwo_unit *dwo_unit = &data->dwo_unit;
8794 struct attribute *attr;
8796 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8799 complaint (&symfile_complaints,
8800 _("Dwarf Error: debug entry at offset 0x%x is missing"
8801 " its dwo_id [in module %s]"),
8802 offset.sect_off, dwo_file->dwo_name);
8806 dwo_unit->dwo_file = dwo_file;
8807 dwo_unit->signature = DW_UNSND (attr);
8808 dwo_unit->section = section;
8809 dwo_unit->offset = offset;
8810 dwo_unit->length = cu->per_cu->length;
8812 if (dwarf2_read_debug)
8813 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8814 offset.sect_off, hex_string (dwo_unit->signature));
8817 /* Create the dwo_unit for the lone CU in DWO_FILE.
8818 Note: This function processes DWO files only, not DWP files. */
8820 static struct dwo_unit *
8821 create_dwo_cu (struct dwo_file *dwo_file)
8823 struct objfile *objfile = dwarf2_per_objfile->objfile;
8824 struct dwarf2_section_info *section = &dwo_file->sections.info;
8827 const gdb_byte *info_ptr, *end_ptr;
8828 struct create_dwo_cu_data create_dwo_cu_data;
8829 struct dwo_unit *dwo_unit;
8831 dwarf2_read_section (objfile, section);
8832 info_ptr = section->buffer;
8834 if (info_ptr == NULL)
8837 /* We can't set abfd until now because the section may be empty or
8838 not present, in which case section->asection will be NULL. */
8839 abfd = section->asection->owner;
8841 if (dwarf2_read_debug)
8843 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8844 bfd_section_name (abfd, section->asection),
8845 bfd_get_filename (abfd));
8848 create_dwo_cu_data.dwo_file = dwo_file;
8851 end_ptr = info_ptr + section->size;
8852 while (info_ptr < end_ptr)
8854 struct dwarf2_per_cu_data per_cu;
8856 memset (&create_dwo_cu_data.dwo_unit, 0,
8857 sizeof (create_dwo_cu_data.dwo_unit));
8858 memset (&per_cu, 0, sizeof (per_cu));
8859 per_cu.objfile = objfile;
8860 per_cu.is_debug_types = 0;
8861 per_cu.offset.sect_off = info_ptr - section->buffer;
8862 per_cu.section = section;
8864 init_cutu_and_read_dies_no_follow (&per_cu,
8865 &dwo_file->sections.abbrev,
8867 create_dwo_cu_reader,
8868 &create_dwo_cu_data);
8870 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8872 /* If we've already found one, complain. We only support one
8873 because having more than one requires hacking the dwo_name of
8874 each to match, which is highly unlikely to happen. */
8875 if (dwo_unit != NULL)
8877 complaint (&symfile_complaints,
8878 _("Multiple CUs in DWO file %s [in module %s]"),
8879 dwo_file->dwo_name, objfile->name);
8883 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8884 *dwo_unit = create_dwo_cu_data.dwo_unit;
8887 info_ptr += per_cu.length;
8893 /* DWP file .debug_{cu,tu}_index section format:
8894 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8898 Both index sections have the same format, and serve to map a 64-bit
8899 signature to a set of section numbers. Each section begins with a header,
8900 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8901 indexes, and a pool of 32-bit section numbers. The index sections will be
8902 aligned at 8-byte boundaries in the file.
8904 The index section header consists of:
8906 V, 32 bit version number
8908 N, 32 bit number of compilation units or type units in the index
8909 M, 32 bit number of slots in the hash table
8911 Numbers are recorded using the byte order of the application binary.
8913 We assume that N and M will not exceed 2^32 - 1.
8915 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8917 The hash table begins at offset 16 in the section, and consists of an array
8918 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8919 order of the application binary). Unused slots in the hash table are 0.
8920 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8922 The parallel table begins immediately after the hash table
8923 (at offset 16 + 8 * M from the beginning of the section), and consists of an
8924 array of 32-bit indexes (using the byte order of the application binary),
8925 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8926 table contains a 32-bit index into the pool of section numbers. For unused
8927 hash table slots, the corresponding entry in the parallel table will be 0.
8929 Given a 64-bit compilation unit signature or a type signature S, an entry
8930 in the hash table is located as follows:
8932 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8933 the low-order k bits all set to 1.
8935 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8937 3) If the hash table entry at index H matches the signature, use that
8938 entry. If the hash table entry at index H is unused (all zeroes),
8939 terminate the search: the signature is not present in the table.
8941 4) Let H = (H + H') modulo M. Repeat at Step 3.
8943 Because M > N and H' and M are relatively prime, the search is guaranteed
8944 to stop at an unused slot or find the match.
8946 The pool of section numbers begins immediately following the hash table
8947 (at offset 16 + 12 * M from the beginning of the section). The pool of
8948 section numbers consists of an array of 32-bit words (using the byte order
8949 of the application binary). Each item in the array is indexed starting
8950 from 0. The hash table entry provides the index of the first section
8951 number in the set. Additional section numbers in the set follow, and the
8952 set is terminated by a 0 entry (section number 0 is not used in ELF).
8954 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8955 section must be the first entry in the set, and the .debug_abbrev.dwo must
8956 be the second entry. Other members of the set may follow in any order. */
8958 /* Create a hash table to map DWO IDs to their CU/TU entry in
8959 .debug_{info,types}.dwo in DWP_FILE.
8960 Returns NULL if there isn't one.
8961 Note: This function processes DWP files only, not DWO files. */
8963 static struct dwp_hash_table *
8964 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8966 struct objfile *objfile = dwarf2_per_objfile->objfile;
8967 bfd *dbfd = dwp_file->dbfd;
8968 const gdb_byte *index_ptr, *index_end;
8969 struct dwarf2_section_info *index;
8970 uint32_t version, nr_units, nr_slots;
8971 struct dwp_hash_table *htab;
8974 index = &dwp_file->sections.tu_index;
8976 index = &dwp_file->sections.cu_index;
8978 if (dwarf2_section_empty_p (index))
8980 dwarf2_read_section (objfile, index);
8982 index_ptr = index->buffer;
8983 index_end = index_ptr + index->size;
8985 version = read_4_bytes (dbfd, index_ptr);
8986 index_ptr += 8; /* Skip the unused word. */
8987 nr_units = read_4_bytes (dbfd, index_ptr);
8989 nr_slots = read_4_bytes (dbfd, index_ptr);
8994 error (_("Dwarf Error: unsupported DWP file version (%s)"
8996 pulongest (version), dwp_file->name);
8998 if (nr_slots != (nr_slots & -nr_slots))
9000 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9001 " is not power of 2 [in module %s]"),
9002 pulongest (nr_slots), dwp_file->name);
9005 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9006 htab->nr_units = nr_units;
9007 htab->nr_slots = nr_slots;
9008 htab->hash_table = index_ptr;
9009 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9010 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
9015 /* Update SECTIONS with the data from SECTP.
9017 This function is like the other "locate" section routines that are
9018 passed to bfd_map_over_sections, but in this context the sections to
9019 read comes from the DWP hash table, not the full ELF section table.
9021 The result is non-zero for success, or zero if an error was found. */
9024 locate_virtual_dwo_sections (asection *sectp,
9025 struct virtual_dwo_sections *sections)
9027 const struct dwop_section_names *names = &dwop_section_names;
9029 if (section_is_p (sectp->name, &names->abbrev_dwo))
9031 /* There can be only one. */
9032 if (sections->abbrev.asection != NULL)
9034 sections->abbrev.asection = sectp;
9035 sections->abbrev.size = bfd_get_section_size (sectp);
9037 else if (section_is_p (sectp->name, &names->info_dwo)
9038 || section_is_p (sectp->name, &names->types_dwo))
9040 /* There can be only one. */
9041 if (sections->info_or_types.asection != NULL)
9043 sections->info_or_types.asection = sectp;
9044 sections->info_or_types.size = bfd_get_section_size (sectp);
9046 else if (section_is_p (sectp->name, &names->line_dwo))
9048 /* There can be only one. */
9049 if (sections->line.asection != NULL)
9051 sections->line.asection = sectp;
9052 sections->line.size = bfd_get_section_size (sectp);
9054 else if (section_is_p (sectp->name, &names->loc_dwo))
9056 /* There can be only one. */
9057 if (sections->loc.asection != NULL)
9059 sections->loc.asection = sectp;
9060 sections->loc.size = bfd_get_section_size (sectp);
9062 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9064 /* There can be only one. */
9065 if (sections->macinfo.asection != NULL)
9067 sections->macinfo.asection = sectp;
9068 sections->macinfo.size = bfd_get_section_size (sectp);
9070 else if (section_is_p (sectp->name, &names->macro_dwo))
9072 /* There can be only one. */
9073 if (sections->macro.asection != NULL)
9075 sections->macro.asection = sectp;
9076 sections->macro.size = bfd_get_section_size (sectp);
9078 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9080 /* There can be only one. */
9081 if (sections->str_offsets.asection != NULL)
9083 sections->str_offsets.asection = sectp;
9084 sections->str_offsets.size = bfd_get_section_size (sectp);
9088 /* No other kind of section is valid. */
9095 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
9096 HTAB is the hash table from the DWP file.
9097 SECTION_INDEX is the index of the DWO in HTAB.
9098 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
9100 static struct dwo_unit *
9101 create_dwo_in_dwp (struct dwp_file *dwp_file,
9102 const struct dwp_hash_table *htab,
9103 uint32_t section_index,
9104 const char *comp_dir,
9105 ULONGEST signature, int is_debug_types)
9107 struct objfile *objfile = dwarf2_per_objfile->objfile;
9108 bfd *dbfd = dwp_file->dbfd;
9109 const char *kind = is_debug_types ? "TU" : "CU";
9110 struct dwo_file *dwo_file;
9111 struct dwo_unit *dwo_unit;
9112 struct virtual_dwo_sections sections;
9113 void **dwo_file_slot;
9114 char *virtual_dwo_name;
9115 struct dwarf2_section_info *cutu;
9116 struct cleanup *cleanups;
9119 if (dwarf2_read_debug)
9121 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP file: %s\n",
9123 pulongest (section_index), hex_string (signature),
9127 /* Fetch the sections of this DWO.
9128 Put a limit on the number of sections we look for so that bad data
9129 doesn't cause us to loop forever. */
9131 #define MAX_NR_DWO_SECTIONS \
9132 (1 /* .debug_info or .debug_types */ \
9133 + 1 /* .debug_abbrev */ \
9134 + 1 /* .debug_line */ \
9135 + 1 /* .debug_loc */ \
9136 + 1 /* .debug_str_offsets */ \
9137 + 1 /* .debug_macro */ \
9138 + 1 /* .debug_macinfo */ \
9139 + 1 /* trailing zero */)
9141 memset (§ions, 0, sizeof (sections));
9142 cleanups = make_cleanup (null_cleanup, 0);
9144 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
9147 uint32_t section_nr =
9150 + (section_index + i) * sizeof (uint32_t));
9152 if (section_nr == 0)
9154 if (section_nr >= dwp_file->num_sections)
9156 error (_("Dwarf Error: bad DWP hash table, section number too large"
9161 sectp = dwp_file->elf_sections[section_nr];
9162 if (! locate_virtual_dwo_sections (sectp, §ions))
9164 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9171 || sections.info_or_types.asection == NULL
9172 || sections.abbrev.asection == NULL)
9174 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9178 if (i == MAX_NR_DWO_SECTIONS)
9180 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9185 /* It's easier for the rest of the code if we fake a struct dwo_file and
9186 have dwo_unit "live" in that. At least for now.
9188 The DWP file can be made up of a random collection of CUs and TUs.
9189 However, for each CU + set of TUs that came from the same original DWO
9190 file, we want to combine them back into a virtual DWO file to save space
9191 (fewer struct dwo_file objects to allocated). Remember that for really
9192 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9195 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9196 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
9197 sections.line.asection ? sections.line.asection->id : 0,
9198 sections.loc.asection ? sections.loc.asection->id : 0,
9199 (sections.str_offsets.asection
9200 ? sections.str_offsets.asection->id
9202 make_cleanup (xfree, virtual_dwo_name);
9203 /* Can we use an existing virtual DWO file? */
9204 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9205 /* Create one if necessary. */
9206 if (*dwo_file_slot == NULL)
9208 if (dwarf2_read_debug)
9210 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9213 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9214 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9216 strlen (virtual_dwo_name));
9217 dwo_file->comp_dir = comp_dir;
9218 dwo_file->sections.abbrev = sections.abbrev;
9219 dwo_file->sections.line = sections.line;
9220 dwo_file->sections.loc = sections.loc;
9221 dwo_file->sections.macinfo = sections.macinfo;
9222 dwo_file->sections.macro = sections.macro;
9223 dwo_file->sections.str_offsets = sections.str_offsets;
9224 /* The "str" section is global to the entire DWP file. */
9225 dwo_file->sections.str = dwp_file->sections.str;
9226 /* The info or types section is assigned later to dwo_unit,
9227 there's no need to record it in dwo_file.
9228 Also, we can't simply record type sections in dwo_file because
9229 we record a pointer into the vector in dwo_unit. As we collect more
9230 types we'll grow the vector and eventually have to reallocate space
9231 for it, invalidating all the pointers into the current copy. */
9232 *dwo_file_slot = dwo_file;
9236 if (dwarf2_read_debug)
9238 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9241 dwo_file = *dwo_file_slot;
9243 do_cleanups (cleanups);
9245 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9246 dwo_unit->dwo_file = dwo_file;
9247 dwo_unit->signature = signature;
9248 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9249 sizeof (struct dwarf2_section_info));
9250 *dwo_unit->section = sections.info_or_types;
9251 /* offset, length, type_offset_in_tu are set later. */
9256 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
9258 static struct dwo_unit *
9259 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
9260 const struct dwp_hash_table *htab,
9261 const char *comp_dir,
9262 ULONGEST signature, int is_debug_types)
9264 bfd *dbfd = dwp_file->dbfd;
9265 uint32_t mask = htab->nr_slots - 1;
9266 uint32_t hash = signature & mask;
9267 uint32_t hash2 = ((signature >> 32) & mask) | 1;
9270 struct dwo_unit find_dwo_cu, *dwo_cu;
9272 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
9273 find_dwo_cu.signature = signature;
9274 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
9279 /* Use a for loop so that we don't loop forever on bad debug info. */
9280 for (i = 0; i < htab->nr_slots; ++i)
9282 ULONGEST signature_in_table;
9284 signature_in_table =
9285 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
9286 if (signature_in_table == signature)
9288 uint32_t section_index =
9289 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
9291 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
9292 comp_dir, signature, is_debug_types);
9295 if (signature_in_table == 0)
9297 hash = (hash + hash2) & mask;
9300 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
9305 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
9306 Open the file specified by FILE_NAME and hand it off to BFD for
9307 preliminary analysis. Return a newly initialized bfd *, which
9308 includes a canonicalized copy of FILE_NAME.
9309 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
9310 SEARCH_CWD is true if the current directory is to be searched.
9311 It will be searched before debug-file-directory.
9312 If unable to find/open the file, return NULL.
9313 NOTE: This function is derived from symfile_bfd_open. */
9316 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
9320 char *absolute_name;
9321 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
9322 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
9323 to debug_file_directory. */
9325 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
9329 if (*debug_file_directory != '\0')
9330 search_path = concat (".", dirname_separator_string,
9331 debug_file_directory, NULL);
9333 search_path = xstrdup (".");
9336 search_path = xstrdup (debug_file_directory);
9340 flags |= OPF_SEARCH_IN_PATH;
9341 desc = openp (search_path, flags, file_name,
9342 O_RDONLY | O_BINARY, &absolute_name);
9343 xfree (search_path);
9347 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
9348 xfree (absolute_name);
9349 if (sym_bfd == NULL)
9351 bfd_set_cacheable (sym_bfd, 1);
9353 if (!bfd_check_format (sym_bfd, bfd_object))
9355 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
9362 /* Try to open DWO file FILE_NAME.
9363 COMP_DIR is the DW_AT_comp_dir attribute.
9364 The result is the bfd handle of the file.
9365 If there is a problem finding or opening the file, return NULL.
9366 Upon success, the canonicalized path of the file is stored in the bfd,
9367 same as symfile_bfd_open. */
9370 open_dwo_file (const char *file_name, const char *comp_dir)
9374 if (IS_ABSOLUTE_PATH (file_name))
9375 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
9377 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
9379 if (comp_dir != NULL)
9381 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
9383 /* NOTE: If comp_dir is a relative path, this will also try the
9384 search path, which seems useful. */
9385 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
9386 xfree (path_to_try);
9391 /* That didn't work, try debug-file-directory, which, despite its name,
9392 is a list of paths. */
9394 if (*debug_file_directory == '\0')
9397 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
9400 /* This function is mapped across the sections and remembers the offset and
9401 size of each of the DWO debugging sections we are interested in. */
9404 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9406 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9407 const struct dwop_section_names *names = &dwop_section_names;
9409 if (section_is_p (sectp->name, &names->abbrev_dwo))
9411 dwo_sections->abbrev.asection = sectp;
9412 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9414 else if (section_is_p (sectp->name, &names->info_dwo))
9416 dwo_sections->info.asection = sectp;
9417 dwo_sections->info.size = bfd_get_section_size (sectp);
9419 else if (section_is_p (sectp->name, &names->line_dwo))
9421 dwo_sections->line.asection = sectp;
9422 dwo_sections->line.size = bfd_get_section_size (sectp);
9424 else if (section_is_p (sectp->name, &names->loc_dwo))
9426 dwo_sections->loc.asection = sectp;
9427 dwo_sections->loc.size = bfd_get_section_size (sectp);
9429 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9431 dwo_sections->macinfo.asection = sectp;
9432 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9434 else if (section_is_p (sectp->name, &names->macro_dwo))
9436 dwo_sections->macro.asection = sectp;
9437 dwo_sections->macro.size = bfd_get_section_size (sectp);
9439 else if (section_is_p (sectp->name, &names->str_dwo))
9441 dwo_sections->str.asection = sectp;
9442 dwo_sections->str.size = bfd_get_section_size (sectp);
9444 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9446 dwo_sections->str_offsets.asection = sectp;
9447 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9449 else if (section_is_p (sectp->name, &names->types_dwo))
9451 struct dwarf2_section_info type_section;
9453 memset (&type_section, 0, sizeof (type_section));
9454 type_section.asection = sectp;
9455 type_section.size = bfd_get_section_size (sectp);
9456 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9461 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9462 by PER_CU. This is for the non-DWP case.
9463 The result is NULL if DWO_NAME can't be found. */
9465 static struct dwo_file *
9466 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9467 const char *dwo_name, const char *comp_dir)
9469 struct objfile *objfile = dwarf2_per_objfile->objfile;
9470 struct dwo_file *dwo_file;
9472 struct cleanup *cleanups;
9474 dbfd = open_dwo_file (dwo_name, comp_dir);
9477 if (dwarf2_read_debug)
9478 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9481 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9482 dwo_file->dwo_name = dwo_name;
9483 dwo_file->comp_dir = comp_dir;
9484 dwo_file->dbfd = dbfd;
9486 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9488 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9490 dwo_file->cu = create_dwo_cu (dwo_file);
9492 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9493 dwo_file->sections.types);
9495 discard_cleanups (cleanups);
9497 if (dwarf2_read_debug)
9498 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9503 /* This function is mapped across the sections and remembers the offset and
9504 size of each of the DWP debugging sections we are interested in. */
9507 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9509 struct dwp_file *dwp_file = dwp_file_ptr;
9510 const struct dwop_section_names *names = &dwop_section_names;
9511 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9513 /* Record the ELF section number for later lookup: this is what the
9514 .debug_cu_index,.debug_tu_index tables use. */
9515 gdb_assert (elf_section_nr < dwp_file->num_sections);
9516 dwp_file->elf_sections[elf_section_nr] = sectp;
9518 /* Look for specific sections that we need. */
9519 if (section_is_p (sectp->name, &names->str_dwo))
9521 dwp_file->sections.str.asection = sectp;
9522 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9524 else if (section_is_p (sectp->name, &names->cu_index))
9526 dwp_file->sections.cu_index.asection = sectp;
9527 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9529 else if (section_is_p (sectp->name, &names->tu_index))
9531 dwp_file->sections.tu_index.asection = sectp;
9532 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9536 /* Hash function for dwp_file loaded CUs/TUs. */
9539 hash_dwp_loaded_cutus (const void *item)
9541 const struct dwo_unit *dwo_unit = item;
9543 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9544 return dwo_unit->signature;
9547 /* Equality function for dwp_file loaded CUs/TUs. */
9550 eq_dwp_loaded_cutus (const void *a, const void *b)
9552 const struct dwo_unit *dua = a;
9553 const struct dwo_unit *dub = b;
9555 return dua->signature == dub->signature;
9558 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9561 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9563 return htab_create_alloc_ex (3,
9564 hash_dwp_loaded_cutus,
9565 eq_dwp_loaded_cutus,
9567 &objfile->objfile_obstack,
9568 hashtab_obstack_allocate,
9569 dummy_obstack_deallocate);
9572 /* Try to open DWP file FILE_NAME.
9573 The result is the bfd handle of the file.
9574 If there is a problem finding or opening the file, return NULL.
9575 Upon success, the canonicalized path of the file is stored in the bfd,
9576 same as symfile_bfd_open. */
9579 open_dwp_file (const char *file_name)
9583 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
9587 /* Work around upstream bug 15652.
9588 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
9589 [Whether that's a "bug" is debatable, but it is getting in our way.]
9590 We have no real idea where the dwp file is, because gdb's realpath-ing
9591 of the executable's path may have discarded the needed info.
9592 [IWBN if the dwp file name was recorded in the executable, akin to
9593 .gnu_debuglink, but that doesn't exist yet.]
9594 Strip the directory from FILE_NAME and search again. */
9595 if (*debug_file_directory != '\0')
9597 /* Don't implicitly search the current directory here.
9598 If the user wants to search "." to handle this case,
9599 it must be added to debug-file-directory. */
9600 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
9607 /* Initialize the use of the DWP file for the current objfile.
9608 By convention the name of the DWP file is ${objfile}.dwp.
9609 The result is NULL if it can't be found. */
9611 static struct dwp_file *
9612 open_and_init_dwp_file (void)
9614 struct objfile *objfile = dwarf2_per_objfile->objfile;
9615 struct dwp_file *dwp_file;
9618 struct cleanup *cleanups;
9620 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9621 cleanups = make_cleanup (xfree, dwp_name);
9623 dbfd = open_dwp_file (dwp_name);
9626 if (dwarf2_read_debug)
9627 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9628 do_cleanups (cleanups);
9631 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9632 dwp_file->name = bfd_get_filename (dbfd);
9633 dwp_file->dbfd = dbfd;
9634 do_cleanups (cleanups);
9636 /* +1: section 0 is unused */
9637 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9638 dwp_file->elf_sections =
9639 OBSTACK_CALLOC (&objfile->objfile_obstack,
9640 dwp_file->num_sections, asection *);
9642 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9644 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9646 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9648 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9650 if (dwarf2_read_debug)
9652 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9653 fprintf_unfiltered (gdb_stdlog,
9654 " %s CUs, %s TUs\n",
9655 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
9656 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
9662 /* Wrapper around open_and_init_dwp_file, only open it once. */
9664 static struct dwp_file *
9667 if (! dwarf2_per_objfile->dwp_checked)
9669 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9670 dwarf2_per_objfile->dwp_checked = 1;
9672 return dwarf2_per_objfile->dwp_file;
9675 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9676 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9677 or in the DWP file for the objfile, referenced by THIS_UNIT.
9678 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9679 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9681 This is called, for example, when wanting to read a variable with a
9682 complex location. Therefore we don't want to do file i/o for every call.
9683 Therefore we don't want to look for a DWO file on every call.
9684 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9685 then we check if we've already seen DWO_NAME, and only THEN do we check
9688 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9689 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9691 static struct dwo_unit *
9692 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9693 const char *dwo_name, const char *comp_dir,
9694 ULONGEST signature, int is_debug_types)
9696 struct objfile *objfile = dwarf2_per_objfile->objfile;
9697 const char *kind = is_debug_types ? "TU" : "CU";
9698 void **dwo_file_slot;
9699 struct dwo_file *dwo_file;
9700 struct dwp_file *dwp_file;
9702 /* First see if there's a DWP file.
9703 If we have a DWP file but didn't find the DWO inside it, don't
9704 look for the original DWO file. It makes gdb behave differently
9705 depending on whether one is debugging in the build tree. */
9707 dwp_file = get_dwp_file ();
9708 if (dwp_file != NULL)
9710 const struct dwp_hash_table *dwp_htab =
9711 is_debug_types ? dwp_file->tus : dwp_file->cus;
9713 if (dwp_htab != NULL)
9715 struct dwo_unit *dwo_cutu =
9716 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9717 signature, is_debug_types);
9719 if (dwo_cutu != NULL)
9721 if (dwarf2_read_debug)
9723 fprintf_unfiltered (gdb_stdlog,
9724 "Virtual DWO %s %s found: @%s\n",
9725 kind, hex_string (signature),
9726 host_address_to_string (dwo_cutu));
9734 /* No DWP file, look for the DWO file. */
9736 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9737 if (*dwo_file_slot == NULL)
9739 /* Read in the file and build a table of the CUs/TUs it contains. */
9740 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9742 /* NOTE: This will be NULL if unable to open the file. */
9743 dwo_file = *dwo_file_slot;
9745 if (dwo_file != NULL)
9747 struct dwo_unit *dwo_cutu = NULL;
9749 if (is_debug_types && dwo_file->tus)
9751 struct dwo_unit find_dwo_cutu;
9753 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9754 find_dwo_cutu.signature = signature;
9755 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9757 else if (!is_debug_types && dwo_file->cu)
9759 if (signature == dwo_file->cu->signature)
9760 dwo_cutu = dwo_file->cu;
9763 if (dwo_cutu != NULL)
9765 if (dwarf2_read_debug)
9767 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9768 kind, dwo_name, hex_string (signature),
9769 host_address_to_string (dwo_cutu));
9776 /* We didn't find it. This could mean a dwo_id mismatch, or
9777 someone deleted the DWO/DWP file, or the search path isn't set up
9778 correctly to find the file. */
9780 if (dwarf2_read_debug)
9782 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9783 kind, dwo_name, hex_string (signature));
9786 complaint (&symfile_complaints,
9787 _("Could not find DWO %s %s(%s) referenced by %s at offset 0x%x"
9789 kind, dwo_name, hex_string (signature),
9790 this_unit->is_debug_types ? "TU" : "CU",
9791 this_unit->offset.sect_off, objfile->name);
9795 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9796 See lookup_dwo_cutu_unit for details. */
9798 static struct dwo_unit *
9799 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9800 const char *dwo_name, const char *comp_dir,
9803 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9806 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9807 See lookup_dwo_cutu_unit for details. */
9809 static struct dwo_unit *
9810 lookup_dwo_type_unit (struct signatured_type *this_tu,
9811 const char *dwo_name, const char *comp_dir)
9813 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9816 /* Free all resources associated with DWO_FILE.
9817 Close the DWO file and munmap the sections.
9818 All memory should be on the objfile obstack. */
9821 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9824 struct dwarf2_section_info *section;
9826 /* Note: dbfd is NULL for virtual DWO files. */
9827 gdb_bfd_unref (dwo_file->dbfd);
9829 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9832 /* Wrapper for free_dwo_file for use in cleanups. */
9835 free_dwo_file_cleanup (void *arg)
9837 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9838 struct objfile *objfile = dwarf2_per_objfile->objfile;
9840 free_dwo_file (dwo_file, objfile);
9843 /* Traversal function for free_dwo_files. */
9846 free_dwo_file_from_slot (void **slot, void *info)
9848 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9849 struct objfile *objfile = (struct objfile *) info;
9851 free_dwo_file (dwo_file, objfile);
9856 /* Free all resources associated with DWO_FILES. */
9859 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9861 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9864 /* Read in various DIEs. */
9866 /* qsort helper for inherit_abstract_dies. */
9869 unsigned_int_compar (const void *ap, const void *bp)
9871 unsigned int a = *(unsigned int *) ap;
9872 unsigned int b = *(unsigned int *) bp;
9874 return (a > b) - (b > a);
9877 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9878 Inherit only the children of the DW_AT_abstract_origin DIE not being
9879 already referenced by DW_AT_abstract_origin from the children of the
9883 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9885 struct die_info *child_die;
9886 unsigned die_children_count;
9887 /* CU offsets which were referenced by children of the current DIE. */
9888 sect_offset *offsets;
9889 sect_offset *offsets_end, *offsetp;
9890 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9891 struct die_info *origin_die;
9892 /* Iterator of the ORIGIN_DIE children. */
9893 struct die_info *origin_child_die;
9894 struct cleanup *cleanups;
9895 struct attribute *attr;
9896 struct dwarf2_cu *origin_cu;
9897 struct pending **origin_previous_list_in_scope;
9899 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9903 /* Note that following die references may follow to a die in a
9907 origin_die = follow_die_ref (die, attr, &origin_cu);
9909 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9911 origin_previous_list_in_scope = origin_cu->list_in_scope;
9912 origin_cu->list_in_scope = cu->list_in_scope;
9914 if (die->tag != origin_die->tag
9915 && !(die->tag == DW_TAG_inlined_subroutine
9916 && origin_die->tag == DW_TAG_subprogram))
9917 complaint (&symfile_complaints,
9918 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9919 die->offset.sect_off, origin_die->offset.sect_off);
9921 child_die = die->child;
9922 die_children_count = 0;
9923 while (child_die && child_die->tag)
9925 child_die = sibling_die (child_die);
9926 die_children_count++;
9928 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9929 cleanups = make_cleanup (xfree, offsets);
9931 offsets_end = offsets;
9932 child_die = die->child;
9933 while (child_die && child_die->tag)
9935 /* For each CHILD_DIE, find the corresponding child of
9936 ORIGIN_DIE. If there is more than one layer of
9937 DW_AT_abstract_origin, follow them all; there shouldn't be,
9938 but GCC versions at least through 4.4 generate this (GCC PR
9940 struct die_info *child_origin_die = child_die;
9941 struct dwarf2_cu *child_origin_cu = cu;
9945 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9949 child_origin_die = follow_die_ref (child_origin_die, attr,
9953 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9954 counterpart may exist. */
9955 if (child_origin_die != child_die)
9957 if (child_die->tag != child_origin_die->tag
9958 && !(child_die->tag == DW_TAG_inlined_subroutine
9959 && child_origin_die->tag == DW_TAG_subprogram))
9960 complaint (&symfile_complaints,
9961 _("Child DIE 0x%x and its abstract origin 0x%x have "
9962 "different tags"), child_die->offset.sect_off,
9963 child_origin_die->offset.sect_off);
9964 if (child_origin_die->parent != origin_die)
9965 complaint (&symfile_complaints,
9966 _("Child DIE 0x%x and its abstract origin 0x%x have "
9967 "different parents"), child_die->offset.sect_off,
9968 child_origin_die->offset.sect_off);
9970 *offsets_end++ = child_origin_die->offset;
9972 child_die = sibling_die (child_die);
9974 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9975 unsigned_int_compar);
9976 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9977 if (offsetp[-1].sect_off == offsetp->sect_off)
9978 complaint (&symfile_complaints,
9979 _("Multiple children of DIE 0x%x refer "
9980 "to DIE 0x%x as their abstract origin"),
9981 die->offset.sect_off, offsetp->sect_off);
9984 origin_child_die = origin_die->child;
9985 while (origin_child_die && origin_child_die->tag)
9987 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9988 while (offsetp < offsets_end
9989 && offsetp->sect_off < origin_child_die->offset.sect_off)
9991 if (offsetp >= offsets_end
9992 || offsetp->sect_off > origin_child_die->offset.sect_off)
9994 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9995 process_die (origin_child_die, origin_cu);
9997 origin_child_die = sibling_die (origin_child_die);
9999 origin_cu->list_in_scope = origin_previous_list_in_scope;
10001 do_cleanups (cleanups);
10005 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
10007 struct objfile *objfile = cu->objfile;
10008 struct context_stack *new;
10011 struct die_info *child_die;
10012 struct attribute *attr, *call_line, *call_file;
10014 CORE_ADDR baseaddr;
10015 struct block *block;
10016 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
10017 VEC (symbolp) *template_args = NULL;
10018 struct template_symbol *templ_func = NULL;
10022 /* If we do not have call site information, we can't show the
10023 caller of this inlined function. That's too confusing, so
10024 only use the scope for local variables. */
10025 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
10026 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
10027 if (call_line == NULL || call_file == NULL)
10029 read_lexical_block_scope (die, cu);
10034 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10036 name = dwarf2_name (die, cu);
10038 /* Ignore functions with missing or empty names. These are actually
10039 illegal according to the DWARF standard. */
10042 complaint (&symfile_complaints,
10043 _("missing name for subprogram DIE at %d"),
10044 die->offset.sect_off);
10048 /* Ignore functions with missing or invalid low and high pc attributes. */
10049 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10051 attr = dwarf2_attr (die, DW_AT_external, cu);
10052 if (!attr || !DW_UNSND (attr))
10053 complaint (&symfile_complaints,
10054 _("cannot get low and high bounds "
10055 "for subprogram DIE at %d"),
10056 die->offset.sect_off);
10061 highpc += baseaddr;
10063 /* If we have any template arguments, then we must allocate a
10064 different sort of symbol. */
10065 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
10067 if (child_die->tag == DW_TAG_template_type_param
10068 || child_die->tag == DW_TAG_template_value_param)
10070 templ_func = allocate_template_symbol (objfile);
10071 templ_func->base.is_cplus_template_function = 1;
10076 new = push_context (0, lowpc);
10077 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
10078 (struct symbol *) templ_func);
10080 /* If there is a location expression for DW_AT_frame_base, record
10082 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
10084 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
10086 cu->list_in_scope = &local_symbols;
10088 if (die->child != NULL)
10090 child_die = die->child;
10091 while (child_die && child_die->tag)
10093 if (child_die->tag == DW_TAG_template_type_param
10094 || child_die->tag == DW_TAG_template_value_param)
10096 struct symbol *arg = new_symbol (child_die, NULL, cu);
10099 VEC_safe_push (symbolp, template_args, arg);
10102 process_die (child_die, cu);
10103 child_die = sibling_die (child_die);
10107 inherit_abstract_dies (die, cu);
10109 /* If we have a DW_AT_specification, we might need to import using
10110 directives from the context of the specification DIE. See the
10111 comment in determine_prefix. */
10112 if (cu->language == language_cplus
10113 && dwarf2_attr (die, DW_AT_specification, cu))
10115 struct dwarf2_cu *spec_cu = cu;
10116 struct die_info *spec_die = die_specification (die, &spec_cu);
10120 child_die = spec_die->child;
10121 while (child_die && child_die->tag)
10123 if (child_die->tag == DW_TAG_imported_module)
10124 process_die (child_die, spec_cu);
10125 child_die = sibling_die (child_die);
10128 /* In some cases, GCC generates specification DIEs that
10129 themselves contain DW_AT_specification attributes. */
10130 spec_die = die_specification (spec_die, &spec_cu);
10134 new = pop_context ();
10135 /* Make a block for the local symbols within. */
10136 block = finish_block (new->name, &local_symbols, new->old_blocks,
10137 lowpc, highpc, objfile);
10139 /* For C++, set the block's scope. */
10140 if ((cu->language == language_cplus || cu->language == language_fortran)
10141 && cu->processing_has_namespace_info)
10142 block_set_scope (block, determine_prefix (die, cu),
10143 &objfile->objfile_obstack);
10145 /* If we have address ranges, record them. */
10146 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10148 /* Attach template arguments to function. */
10149 if (! VEC_empty (symbolp, template_args))
10151 gdb_assert (templ_func != NULL);
10153 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
10154 templ_func->template_arguments
10155 = obstack_alloc (&objfile->objfile_obstack,
10156 (templ_func->n_template_arguments
10157 * sizeof (struct symbol *)));
10158 memcpy (templ_func->template_arguments,
10159 VEC_address (symbolp, template_args),
10160 (templ_func->n_template_arguments * sizeof (struct symbol *)));
10161 VEC_free (symbolp, template_args);
10164 /* In C++, we can have functions nested inside functions (e.g., when
10165 a function declares a class that has methods). This means that
10166 when we finish processing a function scope, we may need to go
10167 back to building a containing block's symbol lists. */
10168 local_symbols = new->locals;
10169 using_directives = new->using_directives;
10171 /* If we've finished processing a top-level function, subsequent
10172 symbols go in the file symbol list. */
10173 if (outermost_context_p ())
10174 cu->list_in_scope = &file_symbols;
10177 /* Process all the DIES contained within a lexical block scope. Start
10178 a new scope, process the dies, and then close the scope. */
10181 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
10183 struct objfile *objfile = cu->objfile;
10184 struct context_stack *new;
10185 CORE_ADDR lowpc, highpc;
10186 struct die_info *child_die;
10187 CORE_ADDR baseaddr;
10189 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10191 /* Ignore blocks with missing or invalid low and high pc attributes. */
10192 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
10193 as multiple lexical blocks? Handling children in a sane way would
10194 be nasty. Might be easier to properly extend generic blocks to
10195 describe ranges. */
10196 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10199 highpc += baseaddr;
10201 push_context (0, lowpc);
10202 if (die->child != NULL)
10204 child_die = die->child;
10205 while (child_die && child_die->tag)
10207 process_die (child_die, cu);
10208 child_die = sibling_die (child_die);
10211 new = pop_context ();
10213 if (local_symbols != NULL || using_directives != NULL)
10215 struct block *block
10216 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
10219 /* Note that recording ranges after traversing children, as we
10220 do here, means that recording a parent's ranges entails
10221 walking across all its children's ranges as they appear in
10222 the address map, which is quadratic behavior.
10224 It would be nicer to record the parent's ranges before
10225 traversing its children, simply overriding whatever you find
10226 there. But since we don't even decide whether to create a
10227 block until after we've traversed its children, that's hard
10229 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10231 local_symbols = new->locals;
10232 using_directives = new->using_directives;
10235 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
10238 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
10240 struct objfile *objfile = cu->objfile;
10241 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10242 CORE_ADDR pc, baseaddr;
10243 struct attribute *attr;
10244 struct call_site *call_site, call_site_local;
10247 struct die_info *child_die;
10249 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10251 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10254 complaint (&symfile_complaints,
10255 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
10256 "DIE 0x%x [in module %s]"),
10257 die->offset.sect_off, objfile->name);
10260 pc = DW_ADDR (attr) + baseaddr;
10262 if (cu->call_site_htab == NULL)
10263 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
10264 NULL, &objfile->objfile_obstack,
10265 hashtab_obstack_allocate, NULL);
10266 call_site_local.pc = pc;
10267 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
10270 complaint (&symfile_complaints,
10271 _("Duplicate PC %s for DW_TAG_GNU_call_site "
10272 "DIE 0x%x [in module %s]"),
10273 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
10277 /* Count parameters at the caller. */
10280 for (child_die = die->child; child_die && child_die->tag;
10281 child_die = sibling_die (child_die))
10283 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10285 complaint (&symfile_complaints,
10286 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
10287 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10288 child_die->tag, child_die->offset.sect_off, objfile->name);
10295 call_site = obstack_alloc (&objfile->objfile_obstack,
10296 (sizeof (*call_site)
10297 + (sizeof (*call_site->parameter)
10298 * (nparams - 1))));
10300 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
10301 call_site->pc = pc;
10303 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
10305 struct die_info *func_die;
10307 /* Skip also over DW_TAG_inlined_subroutine. */
10308 for (func_die = die->parent;
10309 func_die && func_die->tag != DW_TAG_subprogram
10310 && func_die->tag != DW_TAG_subroutine_type;
10311 func_die = func_die->parent);
10313 /* DW_AT_GNU_all_call_sites is a superset
10314 of DW_AT_GNU_all_tail_call_sites. */
10316 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
10317 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
10319 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
10320 not complete. But keep CALL_SITE for look ups via call_site_htab,
10321 both the initial caller containing the real return address PC and
10322 the final callee containing the current PC of a chain of tail
10323 calls do not need to have the tail call list complete. But any
10324 function candidate for a virtual tail call frame searched via
10325 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
10326 determined unambiguously. */
10330 struct type *func_type = NULL;
10333 func_type = get_die_type (func_die, cu);
10334 if (func_type != NULL)
10336 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
10338 /* Enlist this call site to the function. */
10339 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
10340 TYPE_TAIL_CALL_LIST (func_type) = call_site;
10343 complaint (&symfile_complaints,
10344 _("Cannot find function owning DW_TAG_GNU_call_site "
10345 "DIE 0x%x [in module %s]"),
10346 die->offset.sect_off, objfile->name);
10350 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
10352 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10353 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
10354 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
10355 /* Keep NULL DWARF_BLOCK. */;
10356 else if (attr_form_is_block (attr))
10358 struct dwarf2_locexpr_baton *dlbaton;
10360 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
10361 dlbaton->data = DW_BLOCK (attr)->data;
10362 dlbaton->size = DW_BLOCK (attr)->size;
10363 dlbaton->per_cu = cu->per_cu;
10365 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
10367 else if (is_ref_attr (attr))
10369 struct dwarf2_cu *target_cu = cu;
10370 struct die_info *target_die;
10372 target_die = follow_die_ref (die, attr, &target_cu);
10373 gdb_assert (target_cu->objfile == objfile);
10374 if (die_is_declaration (target_die, target_cu))
10376 const char *target_physname = NULL;
10377 struct attribute *target_attr;
10379 /* Prefer the mangled name; otherwise compute the demangled one. */
10380 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
10381 if (target_attr == NULL)
10382 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
10384 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
10385 target_physname = DW_STRING (target_attr);
10387 target_physname = dwarf2_physname (NULL, target_die, target_cu);
10388 if (target_physname == NULL)
10389 complaint (&symfile_complaints,
10390 _("DW_AT_GNU_call_site_target target DIE has invalid "
10391 "physname, for referencing DIE 0x%x [in module %s]"),
10392 die->offset.sect_off, objfile->name);
10394 SET_FIELD_PHYSNAME (call_site->target, target_physname);
10400 /* DW_AT_entry_pc should be preferred. */
10401 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
10402 complaint (&symfile_complaints,
10403 _("DW_AT_GNU_call_site_target target DIE has invalid "
10404 "low pc, for referencing DIE 0x%x [in module %s]"),
10405 die->offset.sect_off, objfile->name);
10407 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
10411 complaint (&symfile_complaints,
10412 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
10413 "block nor reference, for DIE 0x%x [in module %s]"),
10414 die->offset.sect_off, objfile->name);
10416 call_site->per_cu = cu->per_cu;
10418 for (child_die = die->child;
10419 child_die && child_die->tag;
10420 child_die = sibling_die (child_die))
10422 struct call_site_parameter *parameter;
10423 struct attribute *loc, *origin;
10425 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10427 /* Already printed the complaint above. */
10431 gdb_assert (call_site->parameter_count < nparams);
10432 parameter = &call_site->parameter[call_site->parameter_count];
10434 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10435 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10436 register is contained in DW_AT_GNU_call_site_value. */
10438 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10439 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10440 if (loc == NULL && origin != NULL && is_ref_attr (origin))
10442 sect_offset offset;
10444 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10445 offset = dwarf2_get_ref_die_offset (origin);
10446 if (!offset_in_cu_p (&cu->header, offset))
10448 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10449 binding can be done only inside one CU. Such referenced DIE
10450 therefore cannot be even moved to DW_TAG_partial_unit. */
10451 complaint (&symfile_complaints,
10452 _("DW_AT_abstract_origin offset is not in CU for "
10453 "DW_TAG_GNU_call_site child DIE 0x%x "
10455 child_die->offset.sect_off, objfile->name);
10458 parameter->u.param_offset.cu_off = (offset.sect_off
10459 - cu->header.offset.sect_off);
10461 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10463 complaint (&symfile_complaints,
10464 _("No DW_FORM_block* DW_AT_location for "
10465 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10466 child_die->offset.sect_off, objfile->name);
10471 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10472 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10473 if (parameter->u.dwarf_reg != -1)
10474 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10475 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10476 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10477 ¶meter->u.fb_offset))
10478 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10481 complaint (&symfile_complaints,
10482 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10483 "for DW_FORM_block* DW_AT_location is supported for "
10484 "DW_TAG_GNU_call_site child DIE 0x%x "
10486 child_die->offset.sect_off, objfile->name);
10491 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10492 if (!attr_form_is_block (attr))
10494 complaint (&symfile_complaints,
10495 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10496 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10497 child_die->offset.sect_off, objfile->name);
10500 parameter->value = DW_BLOCK (attr)->data;
10501 parameter->value_size = DW_BLOCK (attr)->size;
10503 /* Parameters are not pre-cleared by memset above. */
10504 parameter->data_value = NULL;
10505 parameter->data_value_size = 0;
10506 call_site->parameter_count++;
10508 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10511 if (!attr_form_is_block (attr))
10512 complaint (&symfile_complaints,
10513 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10514 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10515 child_die->offset.sect_off, objfile->name);
10518 parameter->data_value = DW_BLOCK (attr)->data;
10519 parameter->data_value_size = DW_BLOCK (attr)->size;
10525 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10526 Return 1 if the attributes are present and valid, otherwise, return 0.
10527 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10530 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10531 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10532 struct partial_symtab *ranges_pst)
10534 struct objfile *objfile = cu->objfile;
10535 struct comp_unit_head *cu_header = &cu->header;
10536 bfd *obfd = objfile->obfd;
10537 unsigned int addr_size = cu_header->addr_size;
10538 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10539 /* Base address selection entry. */
10542 unsigned int dummy;
10543 const gdb_byte *buffer;
10547 CORE_ADDR high = 0;
10548 CORE_ADDR baseaddr;
10550 found_base = cu->base_known;
10551 base = cu->base_address;
10553 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10554 if (offset >= dwarf2_per_objfile->ranges.size)
10556 complaint (&symfile_complaints,
10557 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10561 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10563 /* Read in the largest possible address. */
10564 marker = read_address (obfd, buffer, cu, &dummy);
10565 if ((marker & mask) == mask)
10567 /* If we found the largest possible address, then
10568 read the base address. */
10569 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10570 buffer += 2 * addr_size;
10571 offset += 2 * addr_size;
10577 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10581 CORE_ADDR range_beginning, range_end;
10583 range_beginning = read_address (obfd, buffer, cu, &dummy);
10584 buffer += addr_size;
10585 range_end = read_address (obfd, buffer, cu, &dummy);
10586 buffer += addr_size;
10587 offset += 2 * addr_size;
10589 /* An end of list marker is a pair of zero addresses. */
10590 if (range_beginning == 0 && range_end == 0)
10591 /* Found the end of list entry. */
10594 /* Each base address selection entry is a pair of 2 values.
10595 The first is the largest possible address, the second is
10596 the base address. Check for a base address here. */
10597 if ((range_beginning & mask) == mask)
10599 /* If we found the largest possible address, then
10600 read the base address. */
10601 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10608 /* We have no valid base address for the ranges
10610 complaint (&symfile_complaints,
10611 _("Invalid .debug_ranges data (no base address)"));
10615 if (range_beginning > range_end)
10617 /* Inverted range entries are invalid. */
10618 complaint (&symfile_complaints,
10619 _("Invalid .debug_ranges data (inverted range)"));
10623 /* Empty range entries have no effect. */
10624 if (range_beginning == range_end)
10627 range_beginning += base;
10630 /* A not-uncommon case of bad debug info.
10631 Don't pollute the addrmap with bad data. */
10632 if (range_beginning + baseaddr == 0
10633 && !dwarf2_per_objfile->has_section_at_zero)
10635 complaint (&symfile_complaints,
10636 _(".debug_ranges entry has start address of zero"
10637 " [in module %s]"), objfile->name);
10641 if (ranges_pst != NULL)
10642 addrmap_set_empty (objfile->psymtabs_addrmap,
10643 range_beginning + baseaddr,
10644 range_end - 1 + baseaddr,
10647 /* FIXME: This is recording everything as a low-high
10648 segment of consecutive addresses. We should have a
10649 data structure for discontiguous block ranges
10653 low = range_beginning;
10659 if (range_beginning < low)
10660 low = range_beginning;
10661 if (range_end > high)
10667 /* If the first entry is an end-of-list marker, the range
10668 describes an empty scope, i.e. no instructions. */
10674 *high_return = high;
10678 /* Get low and high pc attributes from a die. Return 1 if the attributes
10679 are present and valid, otherwise, return 0. Return -1 if the range is
10680 discontinuous, i.e. derived from DW_AT_ranges information. */
10683 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10684 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10685 struct partial_symtab *pst)
10687 struct attribute *attr;
10688 struct attribute *attr_high;
10690 CORE_ADDR high = 0;
10693 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10696 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10699 low = DW_ADDR (attr);
10700 if (attr_high->form == DW_FORM_addr
10701 || attr_high->form == DW_FORM_GNU_addr_index)
10702 high = DW_ADDR (attr_high);
10704 high = low + DW_UNSND (attr_high);
10707 /* Found high w/o low attribute. */
10710 /* Found consecutive range of addresses. */
10715 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10718 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10719 We take advantage of the fact that DW_AT_ranges does not appear
10720 in DW_TAG_compile_unit of DWO files. */
10721 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10722 unsigned int ranges_offset = (DW_UNSND (attr)
10723 + (need_ranges_base
10727 /* Value of the DW_AT_ranges attribute is the offset in the
10728 .debug_ranges section. */
10729 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10731 /* Found discontinuous range of addresses. */
10736 /* read_partial_die has also the strict LOW < HIGH requirement. */
10740 /* When using the GNU linker, .gnu.linkonce. sections are used to
10741 eliminate duplicate copies of functions and vtables and such.
10742 The linker will arbitrarily choose one and discard the others.
10743 The AT_*_pc values for such functions refer to local labels in
10744 these sections. If the section from that file was discarded, the
10745 labels are not in the output, so the relocs get a value of 0.
10746 If this is a discarded function, mark the pc bounds as invalid,
10747 so that GDB will ignore it. */
10748 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10757 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10758 its low and high PC addresses. Do nothing if these addresses could not
10759 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10760 and HIGHPC to the high address if greater than HIGHPC. */
10763 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10764 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10765 struct dwarf2_cu *cu)
10767 CORE_ADDR low, high;
10768 struct die_info *child = die->child;
10770 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10772 *lowpc = min (*lowpc, low);
10773 *highpc = max (*highpc, high);
10776 /* If the language does not allow nested subprograms (either inside
10777 subprograms or lexical blocks), we're done. */
10778 if (cu->language != language_ada)
10781 /* Check all the children of the given DIE. If it contains nested
10782 subprograms, then check their pc bounds. Likewise, we need to
10783 check lexical blocks as well, as they may also contain subprogram
10785 while (child && child->tag)
10787 if (child->tag == DW_TAG_subprogram
10788 || child->tag == DW_TAG_lexical_block)
10789 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10790 child = sibling_die (child);
10794 /* Get the low and high pc's represented by the scope DIE, and store
10795 them in *LOWPC and *HIGHPC. If the correct values can't be
10796 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10799 get_scope_pc_bounds (struct die_info *die,
10800 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10801 struct dwarf2_cu *cu)
10803 CORE_ADDR best_low = (CORE_ADDR) -1;
10804 CORE_ADDR best_high = (CORE_ADDR) 0;
10805 CORE_ADDR current_low, current_high;
10807 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10809 best_low = current_low;
10810 best_high = current_high;
10814 struct die_info *child = die->child;
10816 while (child && child->tag)
10818 switch (child->tag) {
10819 case DW_TAG_subprogram:
10820 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10822 case DW_TAG_namespace:
10823 case DW_TAG_module:
10824 /* FIXME: carlton/2004-01-16: Should we do this for
10825 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10826 that current GCC's always emit the DIEs corresponding
10827 to definitions of methods of classes as children of a
10828 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10829 the DIEs giving the declarations, which could be
10830 anywhere). But I don't see any reason why the
10831 standards says that they have to be there. */
10832 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10834 if (current_low != ((CORE_ADDR) -1))
10836 best_low = min (best_low, current_low);
10837 best_high = max (best_high, current_high);
10845 child = sibling_die (child);
10850 *highpc = best_high;
10853 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10857 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10858 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10860 struct objfile *objfile = cu->objfile;
10861 struct attribute *attr;
10862 struct attribute *attr_high;
10864 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10867 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10870 CORE_ADDR low = DW_ADDR (attr);
10872 if (attr_high->form == DW_FORM_addr
10873 || attr_high->form == DW_FORM_GNU_addr_index)
10874 high = DW_ADDR (attr_high);
10876 high = low + DW_UNSND (attr_high);
10878 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10882 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10885 bfd *obfd = objfile->obfd;
10886 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10887 We take advantage of the fact that DW_AT_ranges does not appear
10888 in DW_TAG_compile_unit of DWO files. */
10889 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10891 /* The value of the DW_AT_ranges attribute is the offset of the
10892 address range list in the .debug_ranges section. */
10893 unsigned long offset = (DW_UNSND (attr)
10894 + (need_ranges_base ? cu->ranges_base : 0));
10895 const gdb_byte *buffer;
10897 /* For some target architectures, but not others, the
10898 read_address function sign-extends the addresses it returns.
10899 To recognize base address selection entries, we need a
10901 unsigned int addr_size = cu->header.addr_size;
10902 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10904 /* The base address, to which the next pair is relative. Note
10905 that this 'base' is a DWARF concept: most entries in a range
10906 list are relative, to reduce the number of relocs against the
10907 debugging information. This is separate from this function's
10908 'baseaddr' argument, which GDB uses to relocate debugging
10909 information from a shared library based on the address at
10910 which the library was loaded. */
10911 CORE_ADDR base = cu->base_address;
10912 int base_known = cu->base_known;
10914 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10915 if (offset >= dwarf2_per_objfile->ranges.size)
10917 complaint (&symfile_complaints,
10918 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10922 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10926 unsigned int bytes_read;
10927 CORE_ADDR start, end;
10929 start = read_address (obfd, buffer, cu, &bytes_read);
10930 buffer += bytes_read;
10931 end = read_address (obfd, buffer, cu, &bytes_read);
10932 buffer += bytes_read;
10934 /* Did we find the end of the range list? */
10935 if (start == 0 && end == 0)
10938 /* Did we find a base address selection entry? */
10939 else if ((start & base_select_mask) == base_select_mask)
10945 /* We found an ordinary address range. */
10950 complaint (&symfile_complaints,
10951 _("Invalid .debug_ranges data "
10952 "(no base address)"));
10958 /* Inverted range entries are invalid. */
10959 complaint (&symfile_complaints,
10960 _("Invalid .debug_ranges data "
10961 "(inverted range)"));
10965 /* Empty range entries have no effect. */
10969 start += base + baseaddr;
10970 end += base + baseaddr;
10972 /* A not-uncommon case of bad debug info.
10973 Don't pollute the addrmap with bad data. */
10974 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10976 complaint (&symfile_complaints,
10977 _(".debug_ranges entry has start address of zero"
10978 " [in module %s]"), objfile->name);
10982 record_block_range (block, start, end - 1);
10988 /* Check whether the producer field indicates either of GCC < 4.6, or the
10989 Intel C/C++ compiler, and cache the result in CU. */
10992 check_producer (struct dwarf2_cu *cu)
10995 int major, minor, release;
10997 if (cu->producer == NULL)
10999 /* For unknown compilers expect their behavior is DWARF version
11002 GCC started to support .debug_types sections by -gdwarf-4 since
11003 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
11004 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
11005 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
11006 interpreted incorrectly by GDB now - GCC PR debug/48229. */
11008 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
11010 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
11012 cs = &cu->producer[strlen ("GNU ")];
11013 while (*cs && !isdigit (*cs))
11015 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
11017 /* Not recognized as GCC. */
11021 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
11022 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
11025 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
11026 cu->producer_is_icc = 1;
11029 /* For other non-GCC compilers, expect their behavior is DWARF version
11033 cu->checked_producer = 1;
11036 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
11037 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
11038 during 4.6.0 experimental. */
11041 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
11043 if (!cu->checked_producer)
11044 check_producer (cu);
11046 return cu->producer_is_gxx_lt_4_6;
11049 /* Return the default accessibility type if it is not overriden by
11050 DW_AT_accessibility. */
11052 static enum dwarf_access_attribute
11053 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
11055 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
11057 /* The default DWARF 2 accessibility for members is public, the default
11058 accessibility for inheritance is private. */
11060 if (die->tag != DW_TAG_inheritance)
11061 return DW_ACCESS_public;
11063 return DW_ACCESS_private;
11067 /* DWARF 3+ defines the default accessibility a different way. The same
11068 rules apply now for DW_TAG_inheritance as for the members and it only
11069 depends on the container kind. */
11071 if (die->parent->tag == DW_TAG_class_type)
11072 return DW_ACCESS_private;
11074 return DW_ACCESS_public;
11078 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
11079 offset. If the attribute was not found return 0, otherwise return
11080 1. If it was found but could not properly be handled, set *OFFSET
11084 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
11087 struct attribute *attr;
11089 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
11094 /* Note that we do not check for a section offset first here.
11095 This is because DW_AT_data_member_location is new in DWARF 4,
11096 so if we see it, we can assume that a constant form is really
11097 a constant and not a section offset. */
11098 if (attr_form_is_constant (attr))
11099 *offset = dwarf2_get_attr_constant_value (attr, 0);
11100 else if (attr_form_is_section_offset (attr))
11101 dwarf2_complex_location_expr_complaint ();
11102 else if (attr_form_is_block (attr))
11103 *offset = decode_locdesc (DW_BLOCK (attr), cu);
11105 dwarf2_complex_location_expr_complaint ();
11113 /* Add an aggregate field to the field list. */
11116 dwarf2_add_field (struct field_info *fip, struct die_info *die,
11117 struct dwarf2_cu *cu)
11119 struct objfile *objfile = cu->objfile;
11120 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11121 struct nextfield *new_field;
11122 struct attribute *attr;
11124 const char *fieldname = "";
11126 /* Allocate a new field list entry and link it in. */
11127 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
11128 make_cleanup (xfree, new_field);
11129 memset (new_field, 0, sizeof (struct nextfield));
11131 if (die->tag == DW_TAG_inheritance)
11133 new_field->next = fip->baseclasses;
11134 fip->baseclasses = new_field;
11138 new_field->next = fip->fields;
11139 fip->fields = new_field;
11143 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11145 new_field->accessibility = DW_UNSND (attr);
11147 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
11148 if (new_field->accessibility != DW_ACCESS_public)
11149 fip->non_public_fields = 1;
11151 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11153 new_field->virtuality = DW_UNSND (attr);
11155 new_field->virtuality = DW_VIRTUALITY_none;
11157 fp = &new_field->field;
11159 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
11163 /* Data member other than a C++ static data member. */
11165 /* Get type of field. */
11166 fp->type = die_type (die, cu);
11168 SET_FIELD_BITPOS (*fp, 0);
11170 /* Get bit size of field (zero if none). */
11171 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
11174 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
11178 FIELD_BITSIZE (*fp) = 0;
11181 /* Get bit offset of field. */
11182 if (handle_data_member_location (die, cu, &offset))
11183 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11184 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
11187 if (gdbarch_bits_big_endian (gdbarch))
11189 /* For big endian bits, the DW_AT_bit_offset gives the
11190 additional bit offset from the MSB of the containing
11191 anonymous object to the MSB of the field. We don't
11192 have to do anything special since we don't need to
11193 know the size of the anonymous object. */
11194 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
11198 /* For little endian bits, compute the bit offset to the
11199 MSB of the anonymous object, subtract off the number of
11200 bits from the MSB of the field to the MSB of the
11201 object, and then subtract off the number of bits of
11202 the field itself. The result is the bit offset of
11203 the LSB of the field. */
11204 int anonymous_size;
11205 int bit_offset = DW_UNSND (attr);
11207 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11210 /* The size of the anonymous object containing
11211 the bit field is explicit, so use the
11212 indicated size (in bytes). */
11213 anonymous_size = DW_UNSND (attr);
11217 /* The size of the anonymous object containing
11218 the bit field must be inferred from the type
11219 attribute of the data member containing the
11221 anonymous_size = TYPE_LENGTH (fp->type);
11223 SET_FIELD_BITPOS (*fp,
11224 (FIELD_BITPOS (*fp)
11225 + anonymous_size * bits_per_byte
11226 - bit_offset - FIELD_BITSIZE (*fp)));
11230 /* Get name of field. */
11231 fieldname = dwarf2_name (die, cu);
11232 if (fieldname == NULL)
11235 /* The name is already allocated along with this objfile, so we don't
11236 need to duplicate it for the type. */
11237 fp->name = fieldname;
11239 /* Change accessibility for artificial fields (e.g. virtual table
11240 pointer or virtual base class pointer) to private. */
11241 if (dwarf2_attr (die, DW_AT_artificial, cu))
11243 FIELD_ARTIFICIAL (*fp) = 1;
11244 new_field->accessibility = DW_ACCESS_private;
11245 fip->non_public_fields = 1;
11248 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
11250 /* C++ static member. */
11252 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
11253 is a declaration, but all versions of G++ as of this writing
11254 (so through at least 3.2.1) incorrectly generate
11255 DW_TAG_variable tags. */
11257 const char *physname;
11259 /* Get name of field. */
11260 fieldname = dwarf2_name (die, cu);
11261 if (fieldname == NULL)
11264 attr = dwarf2_attr (die, DW_AT_const_value, cu);
11266 /* Only create a symbol if this is an external value.
11267 new_symbol checks this and puts the value in the global symbol
11268 table, which we want. If it is not external, new_symbol
11269 will try to put the value in cu->list_in_scope which is wrong. */
11270 && dwarf2_flag_true_p (die, DW_AT_external, cu))
11272 /* A static const member, not much different than an enum as far as
11273 we're concerned, except that we can support more types. */
11274 new_symbol (die, NULL, cu);
11277 /* Get physical name. */
11278 physname = dwarf2_physname (fieldname, die, cu);
11280 /* The name is already allocated along with this objfile, so we don't
11281 need to duplicate it for the type. */
11282 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
11283 FIELD_TYPE (*fp) = die_type (die, cu);
11284 FIELD_NAME (*fp) = fieldname;
11286 else if (die->tag == DW_TAG_inheritance)
11290 /* C++ base class field. */
11291 if (handle_data_member_location (die, cu, &offset))
11292 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11293 FIELD_BITSIZE (*fp) = 0;
11294 FIELD_TYPE (*fp) = die_type (die, cu);
11295 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
11296 fip->nbaseclasses++;
11300 /* Add a typedef defined in the scope of the FIP's class. */
11303 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
11304 struct dwarf2_cu *cu)
11306 struct objfile *objfile = cu->objfile;
11307 struct typedef_field_list *new_field;
11308 struct attribute *attr;
11309 struct typedef_field *fp;
11310 char *fieldname = "";
11312 /* Allocate a new field list entry and link it in. */
11313 new_field = xzalloc (sizeof (*new_field));
11314 make_cleanup (xfree, new_field);
11316 gdb_assert (die->tag == DW_TAG_typedef);
11318 fp = &new_field->field;
11320 /* Get name of field. */
11321 fp->name = dwarf2_name (die, cu);
11322 if (fp->name == NULL)
11325 fp->type = read_type_die (die, cu);
11327 new_field->next = fip->typedef_field_list;
11328 fip->typedef_field_list = new_field;
11329 fip->typedef_field_list_count++;
11332 /* Create the vector of fields, and attach it to the type. */
11335 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
11336 struct dwarf2_cu *cu)
11338 int nfields = fip->nfields;
11340 /* Record the field count, allocate space for the array of fields,
11341 and create blank accessibility bitfields if necessary. */
11342 TYPE_NFIELDS (type) = nfields;
11343 TYPE_FIELDS (type) = (struct field *)
11344 TYPE_ALLOC (type, sizeof (struct field) * nfields);
11345 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
11347 if (fip->non_public_fields && cu->language != language_ada)
11349 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11351 TYPE_FIELD_PRIVATE_BITS (type) =
11352 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11353 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
11355 TYPE_FIELD_PROTECTED_BITS (type) =
11356 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11357 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
11359 TYPE_FIELD_IGNORE_BITS (type) =
11360 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11361 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
11364 /* If the type has baseclasses, allocate and clear a bit vector for
11365 TYPE_FIELD_VIRTUAL_BITS. */
11366 if (fip->nbaseclasses && cu->language != language_ada)
11368 int num_bytes = B_BYTES (fip->nbaseclasses);
11369 unsigned char *pointer;
11371 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11372 pointer = TYPE_ALLOC (type, num_bytes);
11373 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
11374 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
11375 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
11378 /* Copy the saved-up fields into the field vector. Start from the head of
11379 the list, adding to the tail of the field array, so that they end up in
11380 the same order in the array in which they were added to the list. */
11381 while (nfields-- > 0)
11383 struct nextfield *fieldp;
11387 fieldp = fip->fields;
11388 fip->fields = fieldp->next;
11392 fieldp = fip->baseclasses;
11393 fip->baseclasses = fieldp->next;
11396 TYPE_FIELD (type, nfields) = fieldp->field;
11397 switch (fieldp->accessibility)
11399 case DW_ACCESS_private:
11400 if (cu->language != language_ada)
11401 SET_TYPE_FIELD_PRIVATE (type, nfields);
11404 case DW_ACCESS_protected:
11405 if (cu->language != language_ada)
11406 SET_TYPE_FIELD_PROTECTED (type, nfields);
11409 case DW_ACCESS_public:
11413 /* Unknown accessibility. Complain and treat it as public. */
11415 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11416 fieldp->accessibility);
11420 if (nfields < fip->nbaseclasses)
11422 switch (fieldp->virtuality)
11424 case DW_VIRTUALITY_virtual:
11425 case DW_VIRTUALITY_pure_virtual:
11426 if (cu->language == language_ada)
11427 error (_("unexpected virtuality in component of Ada type"));
11428 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11435 /* Return true if this member function is a constructor, false
11439 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11441 const char *fieldname;
11442 const char *typename;
11445 if (die->parent == NULL)
11448 if (die->parent->tag != DW_TAG_structure_type
11449 && die->parent->tag != DW_TAG_union_type
11450 && die->parent->tag != DW_TAG_class_type)
11453 fieldname = dwarf2_name (die, cu);
11454 typename = dwarf2_name (die->parent, cu);
11455 if (fieldname == NULL || typename == NULL)
11458 len = strlen (fieldname);
11459 return (strncmp (fieldname, typename, len) == 0
11460 && (typename[len] == '\0' || typename[len] == '<'));
11463 /* Add a member function to the proper fieldlist. */
11466 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11467 struct type *type, struct dwarf2_cu *cu)
11469 struct objfile *objfile = cu->objfile;
11470 struct attribute *attr;
11471 struct fnfieldlist *flp;
11473 struct fn_field *fnp;
11474 const char *fieldname;
11475 struct nextfnfield *new_fnfield;
11476 struct type *this_type;
11477 enum dwarf_access_attribute accessibility;
11479 if (cu->language == language_ada)
11480 error (_("unexpected member function in Ada type"));
11482 /* Get name of member function. */
11483 fieldname = dwarf2_name (die, cu);
11484 if (fieldname == NULL)
11487 /* Look up member function name in fieldlist. */
11488 for (i = 0; i < fip->nfnfields; i++)
11490 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11494 /* Create new list element if necessary. */
11495 if (i < fip->nfnfields)
11496 flp = &fip->fnfieldlists[i];
11499 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11501 fip->fnfieldlists = (struct fnfieldlist *)
11502 xrealloc (fip->fnfieldlists,
11503 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11504 * sizeof (struct fnfieldlist));
11505 if (fip->nfnfields == 0)
11506 make_cleanup (free_current_contents, &fip->fnfieldlists);
11508 flp = &fip->fnfieldlists[fip->nfnfields];
11509 flp->name = fieldname;
11512 i = fip->nfnfields++;
11515 /* Create a new member function field and chain it to the field list
11517 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11518 make_cleanup (xfree, new_fnfield);
11519 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11520 new_fnfield->next = flp->head;
11521 flp->head = new_fnfield;
11524 /* Fill in the member function field info. */
11525 fnp = &new_fnfield->fnfield;
11527 /* Delay processing of the physname until later. */
11528 if (cu->language == language_cplus || cu->language == language_java)
11530 add_to_method_list (type, i, flp->length - 1, fieldname,
11535 const char *physname = dwarf2_physname (fieldname, die, cu);
11536 fnp->physname = physname ? physname : "";
11539 fnp->type = alloc_type (objfile);
11540 this_type = read_type_die (die, cu);
11541 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11543 int nparams = TYPE_NFIELDS (this_type);
11545 /* TYPE is the domain of this method, and THIS_TYPE is the type
11546 of the method itself (TYPE_CODE_METHOD). */
11547 smash_to_method_type (fnp->type, type,
11548 TYPE_TARGET_TYPE (this_type),
11549 TYPE_FIELDS (this_type),
11550 TYPE_NFIELDS (this_type),
11551 TYPE_VARARGS (this_type));
11553 /* Handle static member functions.
11554 Dwarf2 has no clean way to discern C++ static and non-static
11555 member functions. G++ helps GDB by marking the first
11556 parameter for non-static member functions (which is the this
11557 pointer) as artificial. We obtain this information from
11558 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11559 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11560 fnp->voffset = VOFFSET_STATIC;
11563 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11564 dwarf2_full_name (fieldname, die, cu));
11566 /* Get fcontext from DW_AT_containing_type if present. */
11567 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11568 fnp->fcontext = die_containing_type (die, cu);
11570 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11571 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11573 /* Get accessibility. */
11574 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11576 accessibility = DW_UNSND (attr);
11578 accessibility = dwarf2_default_access_attribute (die, cu);
11579 switch (accessibility)
11581 case DW_ACCESS_private:
11582 fnp->is_private = 1;
11584 case DW_ACCESS_protected:
11585 fnp->is_protected = 1;
11589 /* Check for artificial methods. */
11590 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11591 if (attr && DW_UNSND (attr) != 0)
11592 fnp->is_artificial = 1;
11594 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11596 /* Get index in virtual function table if it is a virtual member
11597 function. For older versions of GCC, this is an offset in the
11598 appropriate virtual table, as specified by DW_AT_containing_type.
11599 For everyone else, it is an expression to be evaluated relative
11600 to the object address. */
11602 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11605 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11607 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11609 /* Old-style GCC. */
11610 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11612 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11613 || (DW_BLOCK (attr)->size > 1
11614 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11615 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11617 struct dwarf_block blk;
11620 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11622 blk.size = DW_BLOCK (attr)->size - offset;
11623 blk.data = DW_BLOCK (attr)->data + offset;
11624 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11625 if ((fnp->voffset % cu->header.addr_size) != 0)
11626 dwarf2_complex_location_expr_complaint ();
11628 fnp->voffset /= cu->header.addr_size;
11632 dwarf2_complex_location_expr_complaint ();
11634 if (!fnp->fcontext)
11635 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11637 else if (attr_form_is_section_offset (attr))
11639 dwarf2_complex_location_expr_complaint ();
11643 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11649 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11650 if (attr && DW_UNSND (attr))
11652 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11653 complaint (&symfile_complaints,
11654 _("Member function \"%s\" (offset %d) is virtual "
11655 "but the vtable offset is not specified"),
11656 fieldname, die->offset.sect_off);
11657 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11658 TYPE_CPLUS_DYNAMIC (type) = 1;
11663 /* Create the vector of member function fields, and attach it to the type. */
11666 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11667 struct dwarf2_cu *cu)
11669 struct fnfieldlist *flp;
11672 if (cu->language == language_ada)
11673 error (_("unexpected member functions in Ada type"));
11675 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11676 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11677 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11679 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11681 struct nextfnfield *nfp = flp->head;
11682 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11685 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11686 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11687 fn_flp->fn_fields = (struct fn_field *)
11688 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11689 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11690 fn_flp->fn_fields[k] = nfp->fnfield;
11693 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11696 /* Returns non-zero if NAME is the name of a vtable member in CU's
11697 language, zero otherwise. */
11699 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11701 static const char vptr[] = "_vptr";
11702 static const char vtable[] = "vtable";
11704 /* Look for the C++ and Java forms of the vtable. */
11705 if ((cu->language == language_java
11706 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11707 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11708 && is_cplus_marker (name[sizeof (vptr) - 1])))
11714 /* GCC outputs unnamed structures that are really pointers to member
11715 functions, with the ABI-specified layout. If TYPE describes
11716 such a structure, smash it into a member function type.
11718 GCC shouldn't do this; it should just output pointer to member DIEs.
11719 This is GCC PR debug/28767. */
11722 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11724 struct type *pfn_type, *domain_type, *new_type;
11726 /* Check for a structure with no name and two children. */
11727 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11730 /* Check for __pfn and __delta members. */
11731 if (TYPE_FIELD_NAME (type, 0) == NULL
11732 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11733 || TYPE_FIELD_NAME (type, 1) == NULL
11734 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11737 /* Find the type of the method. */
11738 pfn_type = TYPE_FIELD_TYPE (type, 0);
11739 if (pfn_type == NULL
11740 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11741 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11744 /* Look for the "this" argument. */
11745 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11746 if (TYPE_NFIELDS (pfn_type) == 0
11747 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11748 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11751 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11752 new_type = alloc_type (objfile);
11753 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11754 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11755 TYPE_VARARGS (pfn_type));
11756 smash_to_methodptr_type (type, new_type);
11759 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11763 producer_is_icc (struct dwarf2_cu *cu)
11765 if (!cu->checked_producer)
11766 check_producer (cu);
11768 return cu->producer_is_icc;
11771 /* Called when we find the DIE that starts a structure or union scope
11772 (definition) to create a type for the structure or union. Fill in
11773 the type's name and general properties; the members will not be
11774 processed until process_structure_scope.
11776 NOTE: we need to call these functions regardless of whether or not the
11777 DIE has a DW_AT_name attribute, since it might be an anonymous
11778 structure or union. This gets the type entered into our set of
11779 user defined types.
11781 However, if the structure is incomplete (an opaque struct/union)
11782 then suppress creating a symbol table entry for it since gdb only
11783 wants to find the one with the complete definition. Note that if
11784 it is complete, we just call new_symbol, which does it's own
11785 checking about whether the struct/union is anonymous or not (and
11786 suppresses creating a symbol table entry itself). */
11788 static struct type *
11789 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11791 struct objfile *objfile = cu->objfile;
11793 struct attribute *attr;
11796 /* If the definition of this type lives in .debug_types, read that type.
11797 Don't follow DW_AT_specification though, that will take us back up
11798 the chain and we want to go down. */
11799 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11802 type = get_DW_AT_signature_type (die, attr, cu);
11804 /* The type's CU may not be the same as CU.
11805 Ensure TYPE is recorded with CU in die_type_hash. */
11806 return set_die_type (die, type, cu);
11809 type = alloc_type (objfile);
11810 INIT_CPLUS_SPECIFIC (type);
11812 name = dwarf2_name (die, cu);
11815 if (cu->language == language_cplus
11816 || cu->language == language_java)
11818 const char *full_name = dwarf2_full_name (name, die, cu);
11820 /* dwarf2_full_name might have already finished building the DIE's
11821 type. If so, there is no need to continue. */
11822 if (get_die_type (die, cu) != NULL)
11823 return get_die_type (die, cu);
11825 TYPE_TAG_NAME (type) = full_name;
11826 if (die->tag == DW_TAG_structure_type
11827 || die->tag == DW_TAG_class_type)
11828 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11832 /* The name is already allocated along with this objfile, so
11833 we don't need to duplicate it for the type. */
11834 TYPE_TAG_NAME (type) = name;
11835 if (die->tag == DW_TAG_class_type)
11836 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11840 if (die->tag == DW_TAG_structure_type)
11842 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11844 else if (die->tag == DW_TAG_union_type)
11846 TYPE_CODE (type) = TYPE_CODE_UNION;
11850 TYPE_CODE (type) = TYPE_CODE_CLASS;
11853 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11854 TYPE_DECLARED_CLASS (type) = 1;
11856 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11859 TYPE_LENGTH (type) = DW_UNSND (attr);
11863 TYPE_LENGTH (type) = 0;
11866 if (producer_is_icc (cu))
11868 /* ICC does not output the required DW_AT_declaration
11869 on incomplete types, but gives them a size of zero. */
11872 TYPE_STUB_SUPPORTED (type) = 1;
11874 if (die_is_declaration (die, cu))
11875 TYPE_STUB (type) = 1;
11876 else if (attr == NULL && die->child == NULL
11877 && producer_is_realview (cu->producer))
11878 /* RealView does not output the required DW_AT_declaration
11879 on incomplete types. */
11880 TYPE_STUB (type) = 1;
11882 /* We need to add the type field to the die immediately so we don't
11883 infinitely recurse when dealing with pointers to the structure
11884 type within the structure itself. */
11885 set_die_type (die, type, cu);
11887 /* set_die_type should be already done. */
11888 set_descriptive_type (type, die, cu);
11893 /* Finish creating a structure or union type, including filling in
11894 its members and creating a symbol for it. */
11897 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11899 struct objfile *objfile = cu->objfile;
11900 struct die_info *child_die = die->child;
11903 type = get_die_type (die, cu);
11905 type = read_structure_type (die, cu);
11907 if (die->child != NULL && ! die_is_declaration (die, cu))
11909 struct field_info fi;
11910 struct die_info *child_die;
11911 VEC (symbolp) *template_args = NULL;
11912 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11914 memset (&fi, 0, sizeof (struct field_info));
11916 child_die = die->child;
11918 while (child_die && child_die->tag)
11920 if (child_die->tag == DW_TAG_member
11921 || child_die->tag == DW_TAG_variable)
11923 /* NOTE: carlton/2002-11-05: A C++ static data member
11924 should be a DW_TAG_member that is a declaration, but
11925 all versions of G++ as of this writing (so through at
11926 least 3.2.1) incorrectly generate DW_TAG_variable
11927 tags for them instead. */
11928 dwarf2_add_field (&fi, child_die, cu);
11930 else if (child_die->tag == DW_TAG_subprogram)
11932 /* C++ member function. */
11933 dwarf2_add_member_fn (&fi, child_die, type, cu);
11935 else if (child_die->tag == DW_TAG_inheritance)
11937 /* C++ base class field. */
11938 dwarf2_add_field (&fi, child_die, cu);
11940 else if (child_die->tag == DW_TAG_typedef)
11941 dwarf2_add_typedef (&fi, child_die, cu);
11942 else if (child_die->tag == DW_TAG_template_type_param
11943 || child_die->tag == DW_TAG_template_value_param)
11945 struct symbol *arg = new_symbol (child_die, NULL, cu);
11948 VEC_safe_push (symbolp, template_args, arg);
11951 child_die = sibling_die (child_die);
11954 /* Attach template arguments to type. */
11955 if (! VEC_empty (symbolp, template_args))
11957 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11958 TYPE_N_TEMPLATE_ARGUMENTS (type)
11959 = VEC_length (symbolp, template_args);
11960 TYPE_TEMPLATE_ARGUMENTS (type)
11961 = obstack_alloc (&objfile->objfile_obstack,
11962 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11963 * sizeof (struct symbol *)));
11964 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11965 VEC_address (symbolp, template_args),
11966 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11967 * sizeof (struct symbol *)));
11968 VEC_free (symbolp, template_args);
11971 /* Attach fields and member functions to the type. */
11973 dwarf2_attach_fields_to_type (&fi, type, cu);
11976 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11978 /* Get the type which refers to the base class (possibly this
11979 class itself) which contains the vtable pointer for the current
11980 class from the DW_AT_containing_type attribute. This use of
11981 DW_AT_containing_type is a GNU extension. */
11983 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11985 struct type *t = die_containing_type (die, cu);
11987 TYPE_VPTR_BASETYPE (type) = t;
11992 /* Our own class provides vtbl ptr. */
11993 for (i = TYPE_NFIELDS (t) - 1;
11994 i >= TYPE_N_BASECLASSES (t);
11997 const char *fieldname = TYPE_FIELD_NAME (t, i);
11999 if (is_vtable_name (fieldname, cu))
12001 TYPE_VPTR_FIELDNO (type) = i;
12006 /* Complain if virtual function table field not found. */
12007 if (i < TYPE_N_BASECLASSES (t))
12008 complaint (&symfile_complaints,
12009 _("virtual function table pointer "
12010 "not found when defining class '%s'"),
12011 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
12016 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
12019 else if (cu->producer
12020 && strncmp (cu->producer,
12021 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
12023 /* The IBM XLC compiler does not provide direct indication
12024 of the containing type, but the vtable pointer is
12025 always named __vfp. */
12029 for (i = TYPE_NFIELDS (type) - 1;
12030 i >= TYPE_N_BASECLASSES (type);
12033 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
12035 TYPE_VPTR_FIELDNO (type) = i;
12036 TYPE_VPTR_BASETYPE (type) = type;
12043 /* Copy fi.typedef_field_list linked list elements content into the
12044 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
12045 if (fi.typedef_field_list)
12047 int i = fi.typedef_field_list_count;
12049 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12050 TYPE_TYPEDEF_FIELD_ARRAY (type)
12051 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
12052 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
12054 /* Reverse the list order to keep the debug info elements order. */
12057 struct typedef_field *dest, *src;
12059 dest = &TYPE_TYPEDEF_FIELD (type, i);
12060 src = &fi.typedef_field_list->field;
12061 fi.typedef_field_list = fi.typedef_field_list->next;
12066 do_cleanups (back_to);
12068 if (HAVE_CPLUS_STRUCT (type))
12069 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
12072 quirk_gcc_member_function_pointer (type, objfile);
12074 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
12075 snapshots) has been known to create a die giving a declaration
12076 for a class that has, as a child, a die giving a definition for a
12077 nested class. So we have to process our children even if the
12078 current die is a declaration. Normally, of course, a declaration
12079 won't have any children at all. */
12081 while (child_die != NULL && child_die->tag)
12083 if (child_die->tag == DW_TAG_member
12084 || child_die->tag == DW_TAG_variable
12085 || child_die->tag == DW_TAG_inheritance
12086 || child_die->tag == DW_TAG_template_value_param
12087 || child_die->tag == DW_TAG_template_type_param)
12092 process_die (child_die, cu);
12094 child_die = sibling_die (child_die);
12097 /* Do not consider external references. According to the DWARF standard,
12098 these DIEs are identified by the fact that they have no byte_size
12099 attribute, and a declaration attribute. */
12100 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
12101 || !die_is_declaration (die, cu))
12102 new_symbol (die, type, cu);
12105 /* Given a DW_AT_enumeration_type die, set its type. We do not
12106 complete the type's fields yet, or create any symbols. */
12108 static struct type *
12109 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
12111 struct objfile *objfile = cu->objfile;
12113 struct attribute *attr;
12116 /* If the definition of this type lives in .debug_types, read that type.
12117 Don't follow DW_AT_specification though, that will take us back up
12118 the chain and we want to go down. */
12119 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12122 type = get_DW_AT_signature_type (die, attr, cu);
12124 /* The type's CU may not be the same as CU.
12125 Ensure TYPE is recorded with CU in die_type_hash. */
12126 return set_die_type (die, type, cu);
12129 type = alloc_type (objfile);
12131 TYPE_CODE (type) = TYPE_CODE_ENUM;
12132 name = dwarf2_full_name (NULL, die, cu);
12134 TYPE_TAG_NAME (type) = name;
12136 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12139 TYPE_LENGTH (type) = DW_UNSND (attr);
12143 TYPE_LENGTH (type) = 0;
12146 /* The enumeration DIE can be incomplete. In Ada, any type can be
12147 declared as private in the package spec, and then defined only
12148 inside the package body. Such types are known as Taft Amendment
12149 Types. When another package uses such a type, an incomplete DIE
12150 may be generated by the compiler. */
12151 if (die_is_declaration (die, cu))
12152 TYPE_STUB (type) = 1;
12154 return set_die_type (die, type, cu);
12157 /* Given a pointer to a die which begins an enumeration, process all
12158 the dies that define the members of the enumeration, and create the
12159 symbol for the enumeration type.
12161 NOTE: We reverse the order of the element list. */
12164 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
12166 struct type *this_type;
12168 this_type = get_die_type (die, cu);
12169 if (this_type == NULL)
12170 this_type = read_enumeration_type (die, cu);
12172 if (die->child != NULL)
12174 struct die_info *child_die;
12175 struct symbol *sym;
12176 struct field *fields = NULL;
12177 int num_fields = 0;
12178 int unsigned_enum = 1;
12183 child_die = die->child;
12184 while (child_die && child_die->tag)
12186 if (child_die->tag != DW_TAG_enumerator)
12188 process_die (child_die, cu);
12192 name = dwarf2_name (child_die, cu);
12195 sym = new_symbol (child_die, this_type, cu);
12196 if (SYMBOL_VALUE (sym) < 0)
12201 else if ((mask & SYMBOL_VALUE (sym)) != 0)
12204 mask |= SYMBOL_VALUE (sym);
12206 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
12208 fields = (struct field *)
12210 (num_fields + DW_FIELD_ALLOC_CHUNK)
12211 * sizeof (struct field));
12214 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
12215 FIELD_TYPE (fields[num_fields]) = NULL;
12216 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
12217 FIELD_BITSIZE (fields[num_fields]) = 0;
12223 child_die = sibling_die (child_die);
12228 TYPE_NFIELDS (this_type) = num_fields;
12229 TYPE_FIELDS (this_type) = (struct field *)
12230 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
12231 memcpy (TYPE_FIELDS (this_type), fields,
12232 sizeof (struct field) * num_fields);
12236 TYPE_UNSIGNED (this_type) = 1;
12238 TYPE_FLAG_ENUM (this_type) = 1;
12241 /* If we are reading an enum from a .debug_types unit, and the enum
12242 is a declaration, and the enum is not the signatured type in the
12243 unit, then we do not want to add a symbol for it. Adding a
12244 symbol would in some cases obscure the true definition of the
12245 enum, giving users an incomplete type when the definition is
12246 actually available. Note that we do not want to do this for all
12247 enums which are just declarations, because C++0x allows forward
12248 enum declarations. */
12249 if (cu->per_cu->is_debug_types
12250 && die_is_declaration (die, cu))
12252 struct signatured_type *sig_type;
12254 sig_type = (struct signatured_type *) cu->per_cu;
12255 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
12256 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
12260 new_symbol (die, this_type, cu);
12263 /* Extract all information from a DW_TAG_array_type DIE and put it in
12264 the DIE's type field. For now, this only handles one dimensional
12267 static struct type *
12268 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
12270 struct objfile *objfile = cu->objfile;
12271 struct die_info *child_die;
12273 struct type *element_type, *range_type, *index_type;
12274 struct type **range_types = NULL;
12275 struct attribute *attr;
12277 struct cleanup *back_to;
12280 element_type = die_type (die, cu);
12282 /* The die_type call above may have already set the type for this DIE. */
12283 type = get_die_type (die, cu);
12287 /* Irix 6.2 native cc creates array types without children for
12288 arrays with unspecified length. */
12289 if (die->child == NULL)
12291 index_type = objfile_type (objfile)->builtin_int;
12292 range_type = create_range_type (NULL, index_type, 0, -1);
12293 type = create_array_type (NULL, element_type, range_type);
12294 return set_die_type (die, type, cu);
12297 back_to = make_cleanup (null_cleanup, NULL);
12298 child_die = die->child;
12299 while (child_die && child_die->tag)
12301 if (child_die->tag == DW_TAG_subrange_type)
12303 struct type *child_type = read_type_die (child_die, cu);
12305 if (child_type != NULL)
12307 /* The range type was succesfully read. Save it for the
12308 array type creation. */
12309 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
12311 range_types = (struct type **)
12312 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
12313 * sizeof (struct type *));
12315 make_cleanup (free_current_contents, &range_types);
12317 range_types[ndim++] = child_type;
12320 child_die = sibling_die (child_die);
12323 /* Dwarf2 dimensions are output from left to right, create the
12324 necessary array types in backwards order. */
12326 type = element_type;
12328 if (read_array_order (die, cu) == DW_ORD_col_major)
12333 type = create_array_type (NULL, type, range_types[i++]);
12338 type = create_array_type (NULL, type, range_types[ndim]);
12341 /* Understand Dwarf2 support for vector types (like they occur on
12342 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
12343 array type. This is not part of the Dwarf2/3 standard yet, but a
12344 custom vendor extension. The main difference between a regular
12345 array and the vector variant is that vectors are passed by value
12347 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
12349 make_vector_type (type);
12351 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
12352 implementation may choose to implement triple vectors using this
12354 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12357 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
12358 TYPE_LENGTH (type) = DW_UNSND (attr);
12360 complaint (&symfile_complaints,
12361 _("DW_AT_byte_size for array type smaller "
12362 "than the total size of elements"));
12365 name = dwarf2_name (die, cu);
12367 TYPE_NAME (type) = name;
12369 /* Install the type in the die. */
12370 set_die_type (die, type, cu);
12372 /* set_die_type should be already done. */
12373 set_descriptive_type (type, die, cu);
12375 do_cleanups (back_to);
12380 static enum dwarf_array_dim_ordering
12381 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
12383 struct attribute *attr;
12385 attr = dwarf2_attr (die, DW_AT_ordering, cu);
12387 if (attr) return DW_SND (attr);
12389 /* GNU F77 is a special case, as at 08/2004 array type info is the
12390 opposite order to the dwarf2 specification, but data is still
12391 laid out as per normal fortran.
12393 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
12394 version checking. */
12396 if (cu->language == language_fortran
12397 && cu->producer && strstr (cu->producer, "GNU F77"))
12399 return DW_ORD_row_major;
12402 switch (cu->language_defn->la_array_ordering)
12404 case array_column_major:
12405 return DW_ORD_col_major;
12406 case array_row_major:
12408 return DW_ORD_row_major;
12412 /* Extract all information from a DW_TAG_set_type DIE and put it in
12413 the DIE's type field. */
12415 static struct type *
12416 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12418 struct type *domain_type, *set_type;
12419 struct attribute *attr;
12421 domain_type = die_type (die, cu);
12423 /* The die_type call above may have already set the type for this DIE. */
12424 set_type = get_die_type (die, cu);
12428 set_type = create_set_type (NULL, domain_type);
12430 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12432 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12434 return set_die_type (die, set_type, cu);
12437 /* A helper for read_common_block that creates a locexpr baton.
12438 SYM is the symbol which we are marking as computed.
12439 COMMON_DIE is the DIE for the common block.
12440 COMMON_LOC is the location expression attribute for the common
12442 MEMBER_LOC is the location expression attribute for the particular
12443 member of the common block that we are processing.
12444 CU is the CU from which the above come. */
12447 mark_common_block_symbol_computed (struct symbol *sym,
12448 struct die_info *common_die,
12449 struct attribute *common_loc,
12450 struct attribute *member_loc,
12451 struct dwarf2_cu *cu)
12453 struct objfile *objfile = dwarf2_per_objfile->objfile;
12454 struct dwarf2_locexpr_baton *baton;
12456 unsigned int cu_off;
12457 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12458 LONGEST offset = 0;
12460 gdb_assert (common_loc && member_loc);
12461 gdb_assert (attr_form_is_block (common_loc));
12462 gdb_assert (attr_form_is_block (member_loc)
12463 || attr_form_is_constant (member_loc));
12465 baton = obstack_alloc (&objfile->objfile_obstack,
12466 sizeof (struct dwarf2_locexpr_baton));
12467 baton->per_cu = cu->per_cu;
12468 gdb_assert (baton->per_cu);
12470 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12472 if (attr_form_is_constant (member_loc))
12474 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12475 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12478 baton->size += DW_BLOCK (member_loc)->size;
12480 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12483 *ptr++ = DW_OP_call4;
12484 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12485 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12488 if (attr_form_is_constant (member_loc))
12490 *ptr++ = DW_OP_addr;
12491 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12492 ptr += cu->header.addr_size;
12496 /* We have to copy the data here, because DW_OP_call4 will only
12497 use a DW_AT_location attribute. */
12498 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12499 ptr += DW_BLOCK (member_loc)->size;
12502 *ptr++ = DW_OP_plus;
12503 gdb_assert (ptr - baton->data == baton->size);
12505 SYMBOL_LOCATION_BATON (sym) = baton;
12506 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12509 /* Create appropriate locally-scoped variables for all the
12510 DW_TAG_common_block entries. Also create a struct common_block
12511 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12512 is used to sepate the common blocks name namespace from regular
12516 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12518 struct attribute *attr;
12520 attr = dwarf2_attr (die, DW_AT_location, cu);
12523 /* Support the .debug_loc offsets. */
12524 if (attr_form_is_block (attr))
12528 else if (attr_form_is_section_offset (attr))
12530 dwarf2_complex_location_expr_complaint ();
12535 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12536 "common block member");
12541 if (die->child != NULL)
12543 struct objfile *objfile = cu->objfile;
12544 struct die_info *child_die;
12545 size_t n_entries = 0, size;
12546 struct common_block *common_block;
12547 struct symbol *sym;
12549 for (child_die = die->child;
12550 child_die && child_die->tag;
12551 child_die = sibling_die (child_die))
12554 size = (sizeof (struct common_block)
12555 + (n_entries - 1) * sizeof (struct symbol *));
12556 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12557 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12558 common_block->n_entries = 0;
12560 for (child_die = die->child;
12561 child_die && child_die->tag;
12562 child_die = sibling_die (child_die))
12564 /* Create the symbol in the DW_TAG_common_block block in the current
12566 sym = new_symbol (child_die, NULL, cu);
12569 struct attribute *member_loc;
12571 common_block->contents[common_block->n_entries++] = sym;
12573 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12577 /* GDB has handled this for a long time, but it is
12578 not specified by DWARF. It seems to have been
12579 emitted by gfortran at least as recently as:
12580 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12581 complaint (&symfile_complaints,
12582 _("Variable in common block has "
12583 "DW_AT_data_member_location "
12584 "- DIE at 0x%x [in module %s]"),
12585 child_die->offset.sect_off, cu->objfile->name);
12587 if (attr_form_is_section_offset (member_loc))
12588 dwarf2_complex_location_expr_complaint ();
12589 else if (attr_form_is_constant (member_loc)
12590 || attr_form_is_block (member_loc))
12593 mark_common_block_symbol_computed (sym, die, attr,
12597 dwarf2_complex_location_expr_complaint ();
12602 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12603 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12607 /* Create a type for a C++ namespace. */
12609 static struct type *
12610 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12612 struct objfile *objfile = cu->objfile;
12613 const char *previous_prefix, *name;
12617 /* For extensions, reuse the type of the original namespace. */
12618 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12620 struct die_info *ext_die;
12621 struct dwarf2_cu *ext_cu = cu;
12623 ext_die = dwarf2_extension (die, &ext_cu);
12624 type = read_type_die (ext_die, ext_cu);
12626 /* EXT_CU may not be the same as CU.
12627 Ensure TYPE is recorded with CU in die_type_hash. */
12628 return set_die_type (die, type, cu);
12631 name = namespace_name (die, &is_anonymous, cu);
12633 /* Now build the name of the current namespace. */
12635 previous_prefix = determine_prefix (die, cu);
12636 if (previous_prefix[0] != '\0')
12637 name = typename_concat (&objfile->objfile_obstack,
12638 previous_prefix, name, 0, cu);
12640 /* Create the type. */
12641 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12643 TYPE_NAME (type) = name;
12644 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12646 return set_die_type (die, type, cu);
12649 /* Read a C++ namespace. */
12652 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12654 struct objfile *objfile = cu->objfile;
12657 /* Add a symbol associated to this if we haven't seen the namespace
12658 before. Also, add a using directive if it's an anonymous
12661 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12665 type = read_type_die (die, cu);
12666 new_symbol (die, type, cu);
12668 namespace_name (die, &is_anonymous, cu);
12671 const char *previous_prefix = determine_prefix (die, cu);
12673 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12674 NULL, NULL, 0, &objfile->objfile_obstack);
12678 if (die->child != NULL)
12680 struct die_info *child_die = die->child;
12682 while (child_die && child_die->tag)
12684 process_die (child_die, cu);
12685 child_die = sibling_die (child_die);
12690 /* Read a Fortran module as type. This DIE can be only a declaration used for
12691 imported module. Still we need that type as local Fortran "use ... only"
12692 declaration imports depend on the created type in determine_prefix. */
12694 static struct type *
12695 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12697 struct objfile *objfile = cu->objfile;
12698 const char *module_name;
12701 module_name = dwarf2_name (die, cu);
12703 complaint (&symfile_complaints,
12704 _("DW_TAG_module has no name, offset 0x%x"),
12705 die->offset.sect_off);
12706 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12708 /* determine_prefix uses TYPE_TAG_NAME. */
12709 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12711 return set_die_type (die, type, cu);
12714 /* Read a Fortran module. */
12717 read_module (struct die_info *die, struct dwarf2_cu *cu)
12719 struct die_info *child_die = die->child;
12721 while (child_die && child_die->tag)
12723 process_die (child_die, cu);
12724 child_die = sibling_die (child_die);
12728 /* Return the name of the namespace represented by DIE. Set
12729 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12732 static const char *
12733 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12735 struct die_info *current_die;
12736 const char *name = NULL;
12738 /* Loop through the extensions until we find a name. */
12740 for (current_die = die;
12741 current_die != NULL;
12742 current_die = dwarf2_extension (die, &cu))
12744 name = dwarf2_name (current_die, cu);
12749 /* Is it an anonymous namespace? */
12751 *is_anonymous = (name == NULL);
12753 name = CP_ANONYMOUS_NAMESPACE_STR;
12758 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12759 the user defined type vector. */
12761 static struct type *
12762 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12764 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12765 struct comp_unit_head *cu_header = &cu->header;
12767 struct attribute *attr_byte_size;
12768 struct attribute *attr_address_class;
12769 int byte_size, addr_class;
12770 struct type *target_type;
12772 target_type = die_type (die, cu);
12774 /* The die_type call above may have already set the type for this DIE. */
12775 type = get_die_type (die, cu);
12779 type = lookup_pointer_type (target_type);
12781 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12782 if (attr_byte_size)
12783 byte_size = DW_UNSND (attr_byte_size);
12785 byte_size = cu_header->addr_size;
12787 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12788 if (attr_address_class)
12789 addr_class = DW_UNSND (attr_address_class);
12791 addr_class = DW_ADDR_none;
12793 /* If the pointer size or address class is different than the
12794 default, create a type variant marked as such and set the
12795 length accordingly. */
12796 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12798 if (gdbarch_address_class_type_flags_p (gdbarch))
12802 type_flags = gdbarch_address_class_type_flags
12803 (gdbarch, byte_size, addr_class);
12804 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12806 type = make_type_with_address_space (type, type_flags);
12808 else if (TYPE_LENGTH (type) != byte_size)
12810 complaint (&symfile_complaints,
12811 _("invalid pointer size %d"), byte_size);
12815 /* Should we also complain about unhandled address classes? */
12819 TYPE_LENGTH (type) = byte_size;
12820 return set_die_type (die, type, cu);
12823 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12824 the user defined type vector. */
12826 static struct type *
12827 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12830 struct type *to_type;
12831 struct type *domain;
12833 to_type = die_type (die, cu);
12834 domain = die_containing_type (die, cu);
12836 /* The calls above may have already set the type for this DIE. */
12837 type = get_die_type (die, cu);
12841 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12842 type = lookup_methodptr_type (to_type);
12843 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12845 struct type *new_type = alloc_type (cu->objfile);
12847 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12848 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12849 TYPE_VARARGS (to_type));
12850 type = lookup_methodptr_type (new_type);
12853 type = lookup_memberptr_type (to_type, domain);
12855 return set_die_type (die, type, cu);
12858 /* Extract all information from a DW_TAG_reference_type DIE and add to
12859 the user defined type vector. */
12861 static struct type *
12862 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12864 struct comp_unit_head *cu_header = &cu->header;
12865 struct type *type, *target_type;
12866 struct attribute *attr;
12868 target_type = die_type (die, cu);
12870 /* The die_type call above may have already set the type for this DIE. */
12871 type = get_die_type (die, cu);
12875 type = lookup_reference_type (target_type);
12876 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12879 TYPE_LENGTH (type) = DW_UNSND (attr);
12883 TYPE_LENGTH (type) = cu_header->addr_size;
12885 return set_die_type (die, type, cu);
12888 static struct type *
12889 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12891 struct type *base_type, *cv_type;
12893 base_type = die_type (die, cu);
12895 /* The die_type call above may have already set the type for this DIE. */
12896 cv_type = get_die_type (die, cu);
12900 /* In case the const qualifier is applied to an array type, the element type
12901 is so qualified, not the array type (section 6.7.3 of C99). */
12902 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12904 struct type *el_type, *inner_array;
12906 base_type = copy_type (base_type);
12907 inner_array = base_type;
12909 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12911 TYPE_TARGET_TYPE (inner_array) =
12912 copy_type (TYPE_TARGET_TYPE (inner_array));
12913 inner_array = TYPE_TARGET_TYPE (inner_array);
12916 el_type = TYPE_TARGET_TYPE (inner_array);
12917 TYPE_TARGET_TYPE (inner_array) =
12918 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12920 return set_die_type (die, base_type, cu);
12923 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12924 return set_die_type (die, cv_type, cu);
12927 static struct type *
12928 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12930 struct type *base_type, *cv_type;
12932 base_type = die_type (die, cu);
12934 /* The die_type call above may have already set the type for this DIE. */
12935 cv_type = get_die_type (die, cu);
12939 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12940 return set_die_type (die, cv_type, cu);
12943 /* Handle DW_TAG_restrict_type. */
12945 static struct type *
12946 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12948 struct type *base_type, *cv_type;
12950 base_type = die_type (die, cu);
12952 /* The die_type call above may have already set the type for this DIE. */
12953 cv_type = get_die_type (die, cu);
12957 cv_type = make_restrict_type (base_type);
12958 return set_die_type (die, cv_type, cu);
12961 /* Extract all information from a DW_TAG_string_type DIE and add to
12962 the user defined type vector. It isn't really a user defined type,
12963 but it behaves like one, with other DIE's using an AT_user_def_type
12964 attribute to reference it. */
12966 static struct type *
12967 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12969 struct objfile *objfile = cu->objfile;
12970 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12971 struct type *type, *range_type, *index_type, *char_type;
12972 struct attribute *attr;
12973 unsigned int length;
12975 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12978 length = DW_UNSND (attr);
12982 /* Check for the DW_AT_byte_size attribute. */
12983 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12986 length = DW_UNSND (attr);
12994 index_type = objfile_type (objfile)->builtin_int;
12995 range_type = create_range_type (NULL, index_type, 1, length);
12996 char_type = language_string_char_type (cu->language_defn, gdbarch);
12997 type = create_string_type (NULL, char_type, range_type);
12999 return set_die_type (die, type, cu);
13002 /* Assuming that DIE corresponds to a function, returns nonzero
13003 if the function is prototyped. */
13006 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
13008 struct attribute *attr;
13010 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
13011 if (attr && (DW_UNSND (attr) != 0))
13014 /* The DWARF standard implies that the DW_AT_prototyped attribute
13015 is only meaninful for C, but the concept also extends to other
13016 languages that allow unprototyped functions (Eg: Objective C).
13017 For all other languages, assume that functions are always
13019 if (cu->language != language_c
13020 && cu->language != language_objc
13021 && cu->language != language_opencl)
13024 /* RealView does not emit DW_AT_prototyped. We can not distinguish
13025 prototyped and unprototyped functions; default to prototyped,
13026 since that is more common in modern code (and RealView warns
13027 about unprototyped functions). */
13028 if (producer_is_realview (cu->producer))
13034 /* Handle DIES due to C code like:
13038 int (*funcp)(int a, long l);
13042 ('funcp' generates a DW_TAG_subroutine_type DIE). */
13044 static struct type *
13045 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
13047 struct objfile *objfile = cu->objfile;
13048 struct type *type; /* Type that this function returns. */
13049 struct type *ftype; /* Function that returns above type. */
13050 struct attribute *attr;
13052 type = die_type (die, cu);
13054 /* The die_type call above may have already set the type for this DIE. */
13055 ftype = get_die_type (die, cu);
13059 ftype = lookup_function_type (type);
13061 if (prototyped_function_p (die, cu))
13062 TYPE_PROTOTYPED (ftype) = 1;
13064 /* Store the calling convention in the type if it's available in
13065 the subroutine die. Otherwise set the calling convention to
13066 the default value DW_CC_normal. */
13067 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
13069 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
13070 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
13071 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
13073 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
13075 /* We need to add the subroutine type to the die immediately so
13076 we don't infinitely recurse when dealing with parameters
13077 declared as the same subroutine type. */
13078 set_die_type (die, ftype, cu);
13080 if (die->child != NULL)
13082 struct type *void_type = objfile_type (objfile)->builtin_void;
13083 struct die_info *child_die;
13084 int nparams, iparams;
13086 /* Count the number of parameters.
13087 FIXME: GDB currently ignores vararg functions, but knows about
13088 vararg member functions. */
13090 child_die = die->child;
13091 while (child_die && child_die->tag)
13093 if (child_die->tag == DW_TAG_formal_parameter)
13095 else if (child_die->tag == DW_TAG_unspecified_parameters)
13096 TYPE_VARARGS (ftype) = 1;
13097 child_die = sibling_die (child_die);
13100 /* Allocate storage for parameters and fill them in. */
13101 TYPE_NFIELDS (ftype) = nparams;
13102 TYPE_FIELDS (ftype) = (struct field *)
13103 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
13105 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
13106 even if we error out during the parameters reading below. */
13107 for (iparams = 0; iparams < nparams; iparams++)
13108 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
13111 child_die = die->child;
13112 while (child_die && child_die->tag)
13114 if (child_die->tag == DW_TAG_formal_parameter)
13116 struct type *arg_type;
13118 /* DWARF version 2 has no clean way to discern C++
13119 static and non-static member functions. G++ helps
13120 GDB by marking the first parameter for non-static
13121 member functions (which is the this pointer) as
13122 artificial. We pass this information to
13123 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
13125 DWARF version 3 added DW_AT_object_pointer, which GCC
13126 4.5 does not yet generate. */
13127 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
13129 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
13132 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
13134 /* GCC/43521: In java, the formal parameter
13135 "this" is sometimes not marked with DW_AT_artificial. */
13136 if (cu->language == language_java)
13138 const char *name = dwarf2_name (child_die, cu);
13140 if (name && !strcmp (name, "this"))
13141 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
13144 arg_type = die_type (child_die, cu);
13146 /* RealView does not mark THIS as const, which the testsuite
13147 expects. GCC marks THIS as const in method definitions,
13148 but not in the class specifications (GCC PR 43053). */
13149 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
13150 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
13153 struct dwarf2_cu *arg_cu = cu;
13154 const char *name = dwarf2_name (child_die, cu);
13156 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
13159 /* If the compiler emits this, use it. */
13160 if (follow_die_ref (die, attr, &arg_cu) == child_die)
13163 else if (name && strcmp (name, "this") == 0)
13164 /* Function definitions will have the argument names. */
13166 else if (name == NULL && iparams == 0)
13167 /* Declarations may not have the names, so like
13168 elsewhere in GDB, assume an artificial first
13169 argument is "this". */
13173 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
13177 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
13180 child_die = sibling_die (child_die);
13187 static struct type *
13188 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
13190 struct objfile *objfile = cu->objfile;
13191 const char *name = NULL;
13192 struct type *this_type, *target_type;
13194 name = dwarf2_full_name (NULL, die, cu);
13195 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
13196 TYPE_FLAG_TARGET_STUB, NULL, objfile);
13197 TYPE_NAME (this_type) = name;
13198 set_die_type (die, this_type, cu);
13199 target_type = die_type (die, cu);
13200 if (target_type != this_type)
13201 TYPE_TARGET_TYPE (this_type) = target_type;
13204 /* Self-referential typedefs are, it seems, not allowed by the DWARF
13205 spec and cause infinite loops in GDB. */
13206 complaint (&symfile_complaints,
13207 _("Self-referential DW_TAG_typedef "
13208 "- DIE at 0x%x [in module %s]"),
13209 die->offset.sect_off, objfile->name);
13210 TYPE_TARGET_TYPE (this_type) = NULL;
13215 /* Find a representation of a given base type and install
13216 it in the TYPE field of the die. */
13218 static struct type *
13219 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
13221 struct objfile *objfile = cu->objfile;
13223 struct attribute *attr;
13224 int encoding = 0, size = 0;
13226 enum type_code code = TYPE_CODE_INT;
13227 int type_flags = 0;
13228 struct type *target_type = NULL;
13230 attr = dwarf2_attr (die, DW_AT_encoding, cu);
13233 encoding = DW_UNSND (attr);
13235 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13238 size = DW_UNSND (attr);
13240 name = dwarf2_name (die, cu);
13243 complaint (&symfile_complaints,
13244 _("DW_AT_name missing from DW_TAG_base_type"));
13249 case DW_ATE_address:
13250 /* Turn DW_ATE_address into a void * pointer. */
13251 code = TYPE_CODE_PTR;
13252 type_flags |= TYPE_FLAG_UNSIGNED;
13253 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
13255 case DW_ATE_boolean:
13256 code = TYPE_CODE_BOOL;
13257 type_flags |= TYPE_FLAG_UNSIGNED;
13259 case DW_ATE_complex_float:
13260 code = TYPE_CODE_COMPLEX;
13261 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
13263 case DW_ATE_decimal_float:
13264 code = TYPE_CODE_DECFLOAT;
13267 code = TYPE_CODE_FLT;
13269 case DW_ATE_signed:
13271 case DW_ATE_unsigned:
13272 type_flags |= TYPE_FLAG_UNSIGNED;
13273 if (cu->language == language_fortran
13275 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
13276 code = TYPE_CODE_CHAR;
13278 case DW_ATE_signed_char:
13279 if (cu->language == language_ada || cu->language == language_m2
13280 || cu->language == language_pascal
13281 || cu->language == language_fortran)
13282 code = TYPE_CODE_CHAR;
13284 case DW_ATE_unsigned_char:
13285 if (cu->language == language_ada || cu->language == language_m2
13286 || cu->language == language_pascal
13287 || cu->language == language_fortran)
13288 code = TYPE_CODE_CHAR;
13289 type_flags |= TYPE_FLAG_UNSIGNED;
13292 /* We just treat this as an integer and then recognize the
13293 type by name elsewhere. */
13297 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
13298 dwarf_type_encoding_name (encoding));
13302 type = init_type (code, size, type_flags, NULL, objfile);
13303 TYPE_NAME (type) = name;
13304 TYPE_TARGET_TYPE (type) = target_type;
13306 if (name && strcmp (name, "char") == 0)
13307 TYPE_NOSIGN (type) = 1;
13309 return set_die_type (die, type, cu);
13312 /* Read the given DW_AT_subrange DIE. */
13314 static struct type *
13315 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
13317 struct type *base_type, *orig_base_type;
13318 struct type *range_type;
13319 struct attribute *attr;
13321 int low_default_is_valid;
13323 LONGEST negative_mask;
13325 orig_base_type = die_type (die, cu);
13326 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
13327 whereas the real type might be. So, we use ORIG_BASE_TYPE when
13328 creating the range type, but we use the result of check_typedef
13329 when examining properties of the type. */
13330 base_type = check_typedef (orig_base_type);
13332 /* The die_type call above may have already set the type for this DIE. */
13333 range_type = get_die_type (die, cu);
13337 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
13338 omitting DW_AT_lower_bound. */
13339 switch (cu->language)
13342 case language_cplus:
13344 low_default_is_valid = 1;
13346 case language_fortran:
13348 low_default_is_valid = 1;
13351 case language_java:
13352 case language_objc:
13354 low_default_is_valid = (cu->header.version >= 4);
13358 case language_pascal:
13360 low_default_is_valid = (cu->header.version >= 4);
13364 low_default_is_valid = 0;
13368 /* FIXME: For variable sized arrays either of these could be
13369 a variable rather than a constant value. We'll allow it,
13370 but we don't know how to handle it. */
13371 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
13373 low = dwarf2_get_attr_constant_value (attr, low);
13374 else if (!low_default_is_valid)
13375 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
13376 "- DIE at 0x%x [in module %s]"),
13377 die->offset.sect_off, cu->objfile->name);
13379 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
13382 if (attr_form_is_block (attr) || is_ref_attr (attr))
13384 /* GCC encodes arrays with unspecified or dynamic length
13385 with a DW_FORM_block1 attribute or a reference attribute.
13386 FIXME: GDB does not yet know how to handle dynamic
13387 arrays properly, treat them as arrays with unspecified
13390 FIXME: jimb/2003-09-22: GDB does not really know
13391 how to handle arrays of unspecified length
13392 either; we just represent them as zero-length
13393 arrays. Choose an appropriate upper bound given
13394 the lower bound we've computed above. */
13398 high = dwarf2_get_attr_constant_value (attr, 1);
13402 attr = dwarf2_attr (die, DW_AT_count, cu);
13405 int count = dwarf2_get_attr_constant_value (attr, 1);
13406 high = low + count - 1;
13410 /* Unspecified array length. */
13415 /* Dwarf-2 specifications explicitly allows to create subrange types
13416 without specifying a base type.
13417 In that case, the base type must be set to the type of
13418 the lower bound, upper bound or count, in that order, if any of these
13419 three attributes references an object that has a type.
13420 If no base type is found, the Dwarf-2 specifications say that
13421 a signed integer type of size equal to the size of an address should
13423 For the following C code: `extern char gdb_int [];'
13424 GCC produces an empty range DIE.
13425 FIXME: muller/2010-05-28: Possible references to object for low bound,
13426 high bound or count are not yet handled by this code. */
13427 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
13429 struct objfile *objfile = cu->objfile;
13430 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13431 int addr_size = gdbarch_addr_bit (gdbarch) /8;
13432 struct type *int_type = objfile_type (objfile)->builtin_int;
13434 /* Test "int", "long int", and "long long int" objfile types,
13435 and select the first one having a size above or equal to the
13436 architecture address size. */
13437 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13438 base_type = int_type;
13441 int_type = objfile_type (objfile)->builtin_long;
13442 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13443 base_type = int_type;
13446 int_type = objfile_type (objfile)->builtin_long_long;
13447 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13448 base_type = int_type;
13454 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13455 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13456 low |= negative_mask;
13457 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13458 high |= negative_mask;
13460 range_type = create_range_type (NULL, orig_base_type, low, high);
13462 /* Mark arrays with dynamic length at least as an array of unspecified
13463 length. GDB could check the boundary but before it gets implemented at
13464 least allow accessing the array elements. */
13465 if (attr && attr_form_is_block (attr))
13466 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13468 /* Ada expects an empty array on no boundary attributes. */
13469 if (attr == NULL && cu->language != language_ada)
13470 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13472 name = dwarf2_name (die, cu);
13474 TYPE_NAME (range_type) = name;
13476 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13478 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13480 set_die_type (die, range_type, cu);
13482 /* set_die_type should be already done. */
13483 set_descriptive_type (range_type, die, cu);
13488 static struct type *
13489 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13493 /* For now, we only support the C meaning of an unspecified type: void. */
13495 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13496 TYPE_NAME (type) = dwarf2_name (die, cu);
13498 return set_die_type (die, type, cu);
13501 /* Read a single die and all its descendents. Set the die's sibling
13502 field to NULL; set other fields in the die correctly, and set all
13503 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13504 location of the info_ptr after reading all of those dies. PARENT
13505 is the parent of the die in question. */
13507 static struct die_info *
13508 read_die_and_children (const struct die_reader_specs *reader,
13509 const gdb_byte *info_ptr,
13510 const gdb_byte **new_info_ptr,
13511 struct die_info *parent)
13513 struct die_info *die;
13514 const gdb_byte *cur_ptr;
13517 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13520 *new_info_ptr = cur_ptr;
13523 store_in_ref_table (die, reader->cu);
13526 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13530 *new_info_ptr = cur_ptr;
13533 die->sibling = NULL;
13534 die->parent = parent;
13538 /* Read a die, all of its descendents, and all of its siblings; set
13539 all of the fields of all of the dies correctly. Arguments are as
13540 in read_die_and_children. */
13542 static struct die_info *
13543 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13544 const gdb_byte *info_ptr,
13545 const gdb_byte **new_info_ptr,
13546 struct die_info *parent)
13548 struct die_info *first_die, *last_sibling;
13549 const gdb_byte *cur_ptr;
13551 cur_ptr = info_ptr;
13552 first_die = last_sibling = NULL;
13556 struct die_info *die
13557 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13561 *new_info_ptr = cur_ptr;
13568 last_sibling->sibling = die;
13570 last_sibling = die;
13574 /* Read a die, all of its descendents, and all of its siblings; set
13575 all of the fields of all of the dies correctly. Arguments are as
13576 in read_die_and_children.
13577 This the main entry point for reading a DIE and all its children. */
13579 static struct die_info *
13580 read_die_and_siblings (const struct die_reader_specs *reader,
13581 const gdb_byte *info_ptr,
13582 const gdb_byte **new_info_ptr,
13583 struct die_info *parent)
13585 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13586 new_info_ptr, parent);
13588 if (dwarf2_die_debug)
13590 fprintf_unfiltered (gdb_stdlog,
13591 "Read die from %s@0x%x of %s:\n",
13592 bfd_section_name (reader->abfd,
13593 reader->die_section->asection),
13594 (unsigned) (info_ptr - reader->die_section->buffer),
13595 bfd_get_filename (reader->abfd));
13596 dump_die (die, dwarf2_die_debug);
13602 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13604 The caller is responsible for filling in the extra attributes
13605 and updating (*DIEP)->num_attrs.
13606 Set DIEP to point to a newly allocated die with its information,
13607 except for its child, sibling, and parent fields.
13608 Set HAS_CHILDREN to tell whether the die has children or not. */
13610 static const gdb_byte *
13611 read_full_die_1 (const struct die_reader_specs *reader,
13612 struct die_info **diep, const gdb_byte *info_ptr,
13613 int *has_children, int num_extra_attrs)
13615 unsigned int abbrev_number, bytes_read, i;
13616 sect_offset offset;
13617 struct abbrev_info *abbrev;
13618 struct die_info *die;
13619 struct dwarf2_cu *cu = reader->cu;
13620 bfd *abfd = reader->abfd;
13622 offset.sect_off = info_ptr - reader->buffer;
13623 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13624 info_ptr += bytes_read;
13625 if (!abbrev_number)
13632 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13634 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13636 bfd_get_filename (abfd));
13638 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13639 die->offset = offset;
13640 die->tag = abbrev->tag;
13641 die->abbrev = abbrev_number;
13643 /* Make the result usable.
13644 The caller needs to update num_attrs after adding the extra
13646 die->num_attrs = abbrev->num_attrs;
13648 for (i = 0; i < abbrev->num_attrs; ++i)
13649 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13653 *has_children = abbrev->has_children;
13657 /* Read a die and all its attributes.
13658 Set DIEP to point to a newly allocated die with its information,
13659 except for its child, sibling, and parent fields.
13660 Set HAS_CHILDREN to tell whether the die has children or not. */
13662 static const gdb_byte *
13663 read_full_die (const struct die_reader_specs *reader,
13664 struct die_info **diep, const gdb_byte *info_ptr,
13667 const gdb_byte *result;
13669 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13671 if (dwarf2_die_debug)
13673 fprintf_unfiltered (gdb_stdlog,
13674 "Read die from %s@0x%x of %s:\n",
13675 bfd_section_name (reader->abfd,
13676 reader->die_section->asection),
13677 (unsigned) (info_ptr - reader->die_section->buffer),
13678 bfd_get_filename (reader->abfd));
13679 dump_die (*diep, dwarf2_die_debug);
13685 /* Abbreviation tables.
13687 In DWARF version 2, the description of the debugging information is
13688 stored in a separate .debug_abbrev section. Before we read any
13689 dies from a section we read in all abbreviations and install them
13690 in a hash table. */
13692 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13694 static struct abbrev_info *
13695 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13697 struct abbrev_info *abbrev;
13699 abbrev = (struct abbrev_info *)
13700 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13701 memset (abbrev, 0, sizeof (struct abbrev_info));
13705 /* Add an abbreviation to the table. */
13708 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13709 unsigned int abbrev_number,
13710 struct abbrev_info *abbrev)
13712 unsigned int hash_number;
13714 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13715 abbrev->next = abbrev_table->abbrevs[hash_number];
13716 abbrev_table->abbrevs[hash_number] = abbrev;
13719 /* Look up an abbrev in the table.
13720 Returns NULL if the abbrev is not found. */
13722 static struct abbrev_info *
13723 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13724 unsigned int abbrev_number)
13726 unsigned int hash_number;
13727 struct abbrev_info *abbrev;
13729 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13730 abbrev = abbrev_table->abbrevs[hash_number];
13734 if (abbrev->number == abbrev_number)
13736 abbrev = abbrev->next;
13741 /* Read in an abbrev table. */
13743 static struct abbrev_table *
13744 abbrev_table_read_table (struct dwarf2_section_info *section,
13745 sect_offset offset)
13747 struct objfile *objfile = dwarf2_per_objfile->objfile;
13748 bfd *abfd = section->asection->owner;
13749 struct abbrev_table *abbrev_table;
13750 const gdb_byte *abbrev_ptr;
13751 struct abbrev_info *cur_abbrev;
13752 unsigned int abbrev_number, bytes_read, abbrev_name;
13753 unsigned int abbrev_form;
13754 struct attr_abbrev *cur_attrs;
13755 unsigned int allocated_attrs;
13757 abbrev_table = XMALLOC (struct abbrev_table);
13758 abbrev_table->offset = offset;
13759 obstack_init (&abbrev_table->abbrev_obstack);
13760 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13762 * sizeof (struct abbrev_info *)));
13763 memset (abbrev_table->abbrevs, 0,
13764 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13766 dwarf2_read_section (objfile, section);
13767 abbrev_ptr = section->buffer + offset.sect_off;
13768 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13769 abbrev_ptr += bytes_read;
13771 allocated_attrs = ATTR_ALLOC_CHUNK;
13772 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13774 /* Loop until we reach an abbrev number of 0. */
13775 while (abbrev_number)
13777 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13779 /* read in abbrev header */
13780 cur_abbrev->number = abbrev_number;
13781 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13782 abbrev_ptr += bytes_read;
13783 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13786 /* now read in declarations */
13787 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13788 abbrev_ptr += bytes_read;
13789 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13790 abbrev_ptr += bytes_read;
13791 while (abbrev_name)
13793 if (cur_abbrev->num_attrs == allocated_attrs)
13795 allocated_attrs += ATTR_ALLOC_CHUNK;
13797 = xrealloc (cur_attrs, (allocated_attrs
13798 * sizeof (struct attr_abbrev)));
13801 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13802 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13803 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13804 abbrev_ptr += bytes_read;
13805 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13806 abbrev_ptr += bytes_read;
13809 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13810 (cur_abbrev->num_attrs
13811 * sizeof (struct attr_abbrev)));
13812 memcpy (cur_abbrev->attrs, cur_attrs,
13813 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13815 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13817 /* Get next abbreviation.
13818 Under Irix6 the abbreviations for a compilation unit are not
13819 always properly terminated with an abbrev number of 0.
13820 Exit loop if we encounter an abbreviation which we have
13821 already read (which means we are about to read the abbreviations
13822 for the next compile unit) or if the end of the abbreviation
13823 table is reached. */
13824 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13826 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13827 abbrev_ptr += bytes_read;
13828 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13833 return abbrev_table;
13836 /* Free the resources held by ABBREV_TABLE. */
13839 abbrev_table_free (struct abbrev_table *abbrev_table)
13841 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13842 xfree (abbrev_table);
13845 /* Same as abbrev_table_free but as a cleanup.
13846 We pass in a pointer to the pointer to the table so that we can
13847 set the pointer to NULL when we're done. It also simplifies
13848 build_type_unit_groups. */
13851 abbrev_table_free_cleanup (void *table_ptr)
13853 struct abbrev_table **abbrev_table_ptr = table_ptr;
13855 if (*abbrev_table_ptr != NULL)
13856 abbrev_table_free (*abbrev_table_ptr);
13857 *abbrev_table_ptr = NULL;
13860 /* Read the abbrev table for CU from ABBREV_SECTION. */
13863 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13864 struct dwarf2_section_info *abbrev_section)
13867 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13870 /* Release the memory used by the abbrev table for a compilation unit. */
13873 dwarf2_free_abbrev_table (void *ptr_to_cu)
13875 struct dwarf2_cu *cu = ptr_to_cu;
13877 if (cu->abbrev_table != NULL)
13878 abbrev_table_free (cu->abbrev_table);
13879 /* Set this to NULL so that we SEGV if we try to read it later,
13880 and also because free_comp_unit verifies this is NULL. */
13881 cu->abbrev_table = NULL;
13884 /* Returns nonzero if TAG represents a type that we might generate a partial
13888 is_type_tag_for_partial (int tag)
13893 /* Some types that would be reasonable to generate partial symbols for,
13894 that we don't at present. */
13895 case DW_TAG_array_type:
13896 case DW_TAG_file_type:
13897 case DW_TAG_ptr_to_member_type:
13898 case DW_TAG_set_type:
13899 case DW_TAG_string_type:
13900 case DW_TAG_subroutine_type:
13902 case DW_TAG_base_type:
13903 case DW_TAG_class_type:
13904 case DW_TAG_interface_type:
13905 case DW_TAG_enumeration_type:
13906 case DW_TAG_structure_type:
13907 case DW_TAG_subrange_type:
13908 case DW_TAG_typedef:
13909 case DW_TAG_union_type:
13916 /* Load all DIEs that are interesting for partial symbols into memory. */
13918 static struct partial_die_info *
13919 load_partial_dies (const struct die_reader_specs *reader,
13920 const gdb_byte *info_ptr, int building_psymtab)
13922 struct dwarf2_cu *cu = reader->cu;
13923 struct objfile *objfile = cu->objfile;
13924 struct partial_die_info *part_die;
13925 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13926 struct abbrev_info *abbrev;
13927 unsigned int bytes_read;
13928 unsigned int load_all = 0;
13929 int nesting_level = 1;
13934 gdb_assert (cu->per_cu != NULL);
13935 if (cu->per_cu->load_all_dies)
13939 = htab_create_alloc_ex (cu->header.length / 12,
13943 &cu->comp_unit_obstack,
13944 hashtab_obstack_allocate,
13945 dummy_obstack_deallocate);
13947 part_die = obstack_alloc (&cu->comp_unit_obstack,
13948 sizeof (struct partial_die_info));
13952 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13954 /* A NULL abbrev means the end of a series of children. */
13955 if (abbrev == NULL)
13957 if (--nesting_level == 0)
13959 /* PART_DIE was probably the last thing allocated on the
13960 comp_unit_obstack, so we could call obstack_free
13961 here. We don't do that because the waste is small,
13962 and will be cleaned up when we're done with this
13963 compilation unit. This way, we're also more robust
13964 against other users of the comp_unit_obstack. */
13967 info_ptr += bytes_read;
13968 last_die = parent_die;
13969 parent_die = parent_die->die_parent;
13973 /* Check for template arguments. We never save these; if
13974 they're seen, we just mark the parent, and go on our way. */
13975 if (parent_die != NULL
13976 && cu->language == language_cplus
13977 && (abbrev->tag == DW_TAG_template_type_param
13978 || abbrev->tag == DW_TAG_template_value_param))
13980 parent_die->has_template_arguments = 1;
13984 /* We don't need a partial DIE for the template argument. */
13985 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13990 /* We only recurse into c++ subprograms looking for template arguments.
13991 Skip their other children. */
13993 && cu->language == language_cplus
13994 && parent_die != NULL
13995 && parent_die->tag == DW_TAG_subprogram)
13997 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14001 /* Check whether this DIE is interesting enough to save. Normally
14002 we would not be interested in members here, but there may be
14003 later variables referencing them via DW_AT_specification (for
14004 static members). */
14006 && !is_type_tag_for_partial (abbrev->tag)
14007 && abbrev->tag != DW_TAG_constant
14008 && abbrev->tag != DW_TAG_enumerator
14009 && abbrev->tag != DW_TAG_subprogram
14010 && abbrev->tag != DW_TAG_lexical_block
14011 && abbrev->tag != DW_TAG_variable
14012 && abbrev->tag != DW_TAG_namespace
14013 && abbrev->tag != DW_TAG_module
14014 && abbrev->tag != DW_TAG_member
14015 && abbrev->tag != DW_TAG_imported_unit)
14017 /* Otherwise we skip to the next sibling, if any. */
14018 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14022 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
14025 /* This two-pass algorithm for processing partial symbols has a
14026 high cost in cache pressure. Thus, handle some simple cases
14027 here which cover the majority of C partial symbols. DIEs
14028 which neither have specification tags in them, nor could have
14029 specification tags elsewhere pointing at them, can simply be
14030 processed and discarded.
14032 This segment is also optional; scan_partial_symbols and
14033 add_partial_symbol will handle these DIEs if we chain
14034 them in normally. When compilers which do not emit large
14035 quantities of duplicate debug information are more common,
14036 this code can probably be removed. */
14038 /* Any complete simple types at the top level (pretty much all
14039 of them, for a language without namespaces), can be processed
14041 if (parent_die == NULL
14042 && part_die->has_specification == 0
14043 && part_die->is_declaration == 0
14044 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
14045 || part_die->tag == DW_TAG_base_type
14046 || part_die->tag == DW_TAG_subrange_type))
14048 if (building_psymtab && part_die->name != NULL)
14049 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14050 VAR_DOMAIN, LOC_TYPEDEF,
14051 &objfile->static_psymbols,
14052 0, (CORE_ADDR) 0, cu->language, objfile);
14053 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14057 /* The exception for DW_TAG_typedef with has_children above is
14058 a workaround of GCC PR debug/47510. In the case of this complaint
14059 type_name_no_tag_or_error will error on such types later.
14061 GDB skipped children of DW_TAG_typedef by the shortcut above and then
14062 it could not find the child DIEs referenced later, this is checked
14063 above. In correct DWARF DW_TAG_typedef should have no children. */
14065 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
14066 complaint (&symfile_complaints,
14067 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
14068 "- DIE at 0x%x [in module %s]"),
14069 part_die->offset.sect_off, objfile->name);
14071 /* If we're at the second level, and we're an enumerator, and
14072 our parent has no specification (meaning possibly lives in a
14073 namespace elsewhere), then we can add the partial symbol now
14074 instead of queueing it. */
14075 if (part_die->tag == DW_TAG_enumerator
14076 && parent_die != NULL
14077 && parent_die->die_parent == NULL
14078 && parent_die->tag == DW_TAG_enumeration_type
14079 && parent_die->has_specification == 0)
14081 if (part_die->name == NULL)
14082 complaint (&symfile_complaints,
14083 _("malformed enumerator DIE ignored"));
14084 else if (building_psymtab)
14085 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14086 VAR_DOMAIN, LOC_CONST,
14087 (cu->language == language_cplus
14088 || cu->language == language_java)
14089 ? &objfile->global_psymbols
14090 : &objfile->static_psymbols,
14091 0, (CORE_ADDR) 0, cu->language, objfile);
14093 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14097 /* We'll save this DIE so link it in. */
14098 part_die->die_parent = parent_die;
14099 part_die->die_sibling = NULL;
14100 part_die->die_child = NULL;
14102 if (last_die && last_die == parent_die)
14103 last_die->die_child = part_die;
14105 last_die->die_sibling = part_die;
14107 last_die = part_die;
14109 if (first_die == NULL)
14110 first_die = part_die;
14112 /* Maybe add the DIE to the hash table. Not all DIEs that we
14113 find interesting need to be in the hash table, because we
14114 also have the parent/sibling/child chains; only those that we
14115 might refer to by offset later during partial symbol reading.
14117 For now this means things that might have be the target of a
14118 DW_AT_specification, DW_AT_abstract_origin, or
14119 DW_AT_extension. DW_AT_extension will refer only to
14120 namespaces; DW_AT_abstract_origin refers to functions (and
14121 many things under the function DIE, but we do not recurse
14122 into function DIEs during partial symbol reading) and
14123 possibly variables as well; DW_AT_specification refers to
14124 declarations. Declarations ought to have the DW_AT_declaration
14125 flag. It happens that GCC forgets to put it in sometimes, but
14126 only for functions, not for types.
14128 Adding more things than necessary to the hash table is harmless
14129 except for the performance cost. Adding too few will result in
14130 wasted time in find_partial_die, when we reread the compilation
14131 unit with load_all_dies set. */
14134 || abbrev->tag == DW_TAG_constant
14135 || abbrev->tag == DW_TAG_subprogram
14136 || abbrev->tag == DW_TAG_variable
14137 || abbrev->tag == DW_TAG_namespace
14138 || part_die->is_declaration)
14142 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
14143 part_die->offset.sect_off, INSERT);
14147 part_die = obstack_alloc (&cu->comp_unit_obstack,
14148 sizeof (struct partial_die_info));
14150 /* For some DIEs we want to follow their children (if any). For C
14151 we have no reason to follow the children of structures; for other
14152 languages we have to, so that we can get at method physnames
14153 to infer fully qualified class names, for DW_AT_specification,
14154 and for C++ template arguments. For C++, we also look one level
14155 inside functions to find template arguments (if the name of the
14156 function does not already contain the template arguments).
14158 For Ada, we need to scan the children of subprograms and lexical
14159 blocks as well because Ada allows the definition of nested
14160 entities that could be interesting for the debugger, such as
14161 nested subprograms for instance. */
14162 if (last_die->has_children
14164 || last_die->tag == DW_TAG_namespace
14165 || last_die->tag == DW_TAG_module
14166 || last_die->tag == DW_TAG_enumeration_type
14167 || (cu->language == language_cplus
14168 && last_die->tag == DW_TAG_subprogram
14169 && (last_die->name == NULL
14170 || strchr (last_die->name, '<') == NULL))
14171 || (cu->language != language_c
14172 && (last_die->tag == DW_TAG_class_type
14173 || last_die->tag == DW_TAG_interface_type
14174 || last_die->tag == DW_TAG_structure_type
14175 || last_die->tag == DW_TAG_union_type))
14176 || (cu->language == language_ada
14177 && (last_die->tag == DW_TAG_subprogram
14178 || last_die->tag == DW_TAG_lexical_block))))
14181 parent_die = last_die;
14185 /* Otherwise we skip to the next sibling, if any. */
14186 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
14188 /* Back to the top, do it again. */
14192 /* Read a minimal amount of information into the minimal die structure. */
14194 static const gdb_byte *
14195 read_partial_die (const struct die_reader_specs *reader,
14196 struct partial_die_info *part_die,
14197 struct abbrev_info *abbrev, unsigned int abbrev_len,
14198 const gdb_byte *info_ptr)
14200 struct dwarf2_cu *cu = reader->cu;
14201 struct objfile *objfile = cu->objfile;
14202 const gdb_byte *buffer = reader->buffer;
14204 struct attribute attr;
14205 int has_low_pc_attr = 0;
14206 int has_high_pc_attr = 0;
14207 int high_pc_relative = 0;
14209 memset (part_die, 0, sizeof (struct partial_die_info));
14211 part_die->offset.sect_off = info_ptr - buffer;
14213 info_ptr += abbrev_len;
14215 if (abbrev == NULL)
14218 part_die->tag = abbrev->tag;
14219 part_die->has_children = abbrev->has_children;
14221 for (i = 0; i < abbrev->num_attrs; ++i)
14223 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
14225 /* Store the data if it is of an attribute we want to keep in a
14226 partial symbol table. */
14230 switch (part_die->tag)
14232 case DW_TAG_compile_unit:
14233 case DW_TAG_partial_unit:
14234 case DW_TAG_type_unit:
14235 /* Compilation units have a DW_AT_name that is a filename, not
14236 a source language identifier. */
14237 case DW_TAG_enumeration_type:
14238 case DW_TAG_enumerator:
14239 /* These tags always have simple identifiers already; no need
14240 to canonicalize them. */
14241 part_die->name = DW_STRING (&attr);
14245 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
14246 &objfile->objfile_obstack);
14250 case DW_AT_linkage_name:
14251 case DW_AT_MIPS_linkage_name:
14252 /* Note that both forms of linkage name might appear. We
14253 assume they will be the same, and we only store the last
14255 if (cu->language == language_ada)
14256 part_die->name = DW_STRING (&attr);
14257 part_die->linkage_name = DW_STRING (&attr);
14260 has_low_pc_attr = 1;
14261 part_die->lowpc = DW_ADDR (&attr);
14263 case DW_AT_high_pc:
14264 has_high_pc_attr = 1;
14265 if (attr.form == DW_FORM_addr
14266 || attr.form == DW_FORM_GNU_addr_index)
14267 part_die->highpc = DW_ADDR (&attr);
14270 high_pc_relative = 1;
14271 part_die->highpc = DW_UNSND (&attr);
14274 case DW_AT_location:
14275 /* Support the .debug_loc offsets. */
14276 if (attr_form_is_block (&attr))
14278 part_die->d.locdesc = DW_BLOCK (&attr);
14280 else if (attr_form_is_section_offset (&attr))
14282 dwarf2_complex_location_expr_complaint ();
14286 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14287 "partial symbol information");
14290 case DW_AT_external:
14291 part_die->is_external = DW_UNSND (&attr);
14293 case DW_AT_declaration:
14294 part_die->is_declaration = DW_UNSND (&attr);
14297 part_die->has_type = 1;
14299 case DW_AT_abstract_origin:
14300 case DW_AT_specification:
14301 case DW_AT_extension:
14302 part_die->has_specification = 1;
14303 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
14304 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14305 || cu->per_cu->is_dwz);
14307 case DW_AT_sibling:
14308 /* Ignore absolute siblings, they might point outside of
14309 the current compile unit. */
14310 if (attr.form == DW_FORM_ref_addr)
14311 complaint (&symfile_complaints,
14312 _("ignoring absolute DW_AT_sibling"));
14314 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
14316 case DW_AT_byte_size:
14317 part_die->has_byte_size = 1;
14319 case DW_AT_calling_convention:
14320 /* DWARF doesn't provide a way to identify a program's source-level
14321 entry point. DW_AT_calling_convention attributes are only meant
14322 to describe functions' calling conventions.
14324 However, because it's a necessary piece of information in
14325 Fortran, and because DW_CC_program is the only piece of debugging
14326 information whose definition refers to a 'main program' at all,
14327 several compilers have begun marking Fortran main programs with
14328 DW_CC_program --- even when those functions use the standard
14329 calling conventions.
14331 So until DWARF specifies a way to provide this information and
14332 compilers pick up the new representation, we'll support this
14334 if (DW_UNSND (&attr) == DW_CC_program
14335 && cu->language == language_fortran)
14337 set_main_name (part_die->name);
14339 /* As this DIE has a static linkage the name would be difficult
14340 to look up later. */
14341 language_of_main = language_fortran;
14345 if (DW_UNSND (&attr) == DW_INL_inlined
14346 || DW_UNSND (&attr) == DW_INL_declared_inlined)
14347 part_die->may_be_inlined = 1;
14351 if (part_die->tag == DW_TAG_imported_unit)
14353 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
14354 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14355 || cu->per_cu->is_dwz);
14364 if (high_pc_relative)
14365 part_die->highpc += part_die->lowpc;
14367 if (has_low_pc_attr && has_high_pc_attr)
14369 /* When using the GNU linker, .gnu.linkonce. sections are used to
14370 eliminate duplicate copies of functions and vtables and such.
14371 The linker will arbitrarily choose one and discard the others.
14372 The AT_*_pc values for such functions refer to local labels in
14373 these sections. If the section from that file was discarded, the
14374 labels are not in the output, so the relocs get a value of 0.
14375 If this is a discarded function, mark the pc bounds as invalid,
14376 so that GDB will ignore it. */
14377 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
14379 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14381 complaint (&symfile_complaints,
14382 _("DW_AT_low_pc %s is zero "
14383 "for DIE at 0x%x [in module %s]"),
14384 paddress (gdbarch, part_die->lowpc),
14385 part_die->offset.sect_off, objfile->name);
14387 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
14388 else if (part_die->lowpc >= part_die->highpc)
14390 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14392 complaint (&symfile_complaints,
14393 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
14394 "for DIE at 0x%x [in module %s]"),
14395 paddress (gdbarch, part_die->lowpc),
14396 paddress (gdbarch, part_die->highpc),
14397 part_die->offset.sect_off, objfile->name);
14400 part_die->has_pc_info = 1;
14406 /* Find a cached partial DIE at OFFSET in CU. */
14408 static struct partial_die_info *
14409 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
14411 struct partial_die_info *lookup_die = NULL;
14412 struct partial_die_info part_die;
14414 part_die.offset = offset;
14415 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
14421 /* Find a partial DIE at OFFSET, which may or may not be in CU,
14422 except in the case of .debug_types DIEs which do not reference
14423 outside their CU (they do however referencing other types via
14424 DW_FORM_ref_sig8). */
14426 static struct partial_die_info *
14427 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
14429 struct objfile *objfile = cu->objfile;
14430 struct dwarf2_per_cu_data *per_cu = NULL;
14431 struct partial_die_info *pd = NULL;
14433 if (offset_in_dwz == cu->per_cu->is_dwz
14434 && offset_in_cu_p (&cu->header, offset))
14436 pd = find_partial_die_in_comp_unit (offset, cu);
14439 /* We missed recording what we needed.
14440 Load all dies and try again. */
14441 per_cu = cu->per_cu;
14445 /* TUs don't reference other CUs/TUs (except via type signatures). */
14446 if (cu->per_cu->is_debug_types)
14448 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14449 " external reference to offset 0x%lx [in module %s].\n"),
14450 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14451 bfd_get_filename (objfile->obfd));
14453 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14456 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14457 load_partial_comp_unit (per_cu);
14459 per_cu->cu->last_used = 0;
14460 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14463 /* If we didn't find it, and not all dies have been loaded,
14464 load them all and try again. */
14466 if (pd == NULL && per_cu->load_all_dies == 0)
14468 per_cu->load_all_dies = 1;
14470 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14471 THIS_CU->cu may already be in use. So we can't just free it and
14472 replace its DIEs with the ones we read in. Instead, we leave those
14473 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14474 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14476 load_partial_comp_unit (per_cu);
14478 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14482 internal_error (__FILE__, __LINE__,
14483 _("could not find partial DIE 0x%x "
14484 "in cache [from module %s]\n"),
14485 offset.sect_off, bfd_get_filename (objfile->obfd));
14489 /* See if we can figure out if the class lives in a namespace. We do
14490 this by looking for a member function; its demangled name will
14491 contain namespace info, if there is any. */
14494 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14495 struct dwarf2_cu *cu)
14497 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14498 what template types look like, because the demangler
14499 frequently doesn't give the same name as the debug info. We
14500 could fix this by only using the demangled name to get the
14501 prefix (but see comment in read_structure_type). */
14503 struct partial_die_info *real_pdi;
14504 struct partial_die_info *child_pdi;
14506 /* If this DIE (this DIE's specification, if any) has a parent, then
14507 we should not do this. We'll prepend the parent's fully qualified
14508 name when we create the partial symbol. */
14510 real_pdi = struct_pdi;
14511 while (real_pdi->has_specification)
14512 real_pdi = find_partial_die (real_pdi->spec_offset,
14513 real_pdi->spec_is_dwz, cu);
14515 if (real_pdi->die_parent != NULL)
14518 for (child_pdi = struct_pdi->die_child;
14520 child_pdi = child_pdi->die_sibling)
14522 if (child_pdi->tag == DW_TAG_subprogram
14523 && child_pdi->linkage_name != NULL)
14525 char *actual_class_name
14526 = language_class_name_from_physname (cu->language_defn,
14527 child_pdi->linkage_name);
14528 if (actual_class_name != NULL)
14531 = obstack_copy0 (&cu->objfile->objfile_obstack,
14533 strlen (actual_class_name));
14534 xfree (actual_class_name);
14541 /* Adjust PART_DIE before generating a symbol for it. This function
14542 may set the is_external flag or change the DIE's name. */
14545 fixup_partial_die (struct partial_die_info *part_die,
14546 struct dwarf2_cu *cu)
14548 /* Once we've fixed up a die, there's no point in doing so again.
14549 This also avoids a memory leak if we were to call
14550 guess_partial_die_structure_name multiple times. */
14551 if (part_die->fixup_called)
14554 /* If we found a reference attribute and the DIE has no name, try
14555 to find a name in the referred to DIE. */
14557 if (part_die->name == NULL && part_die->has_specification)
14559 struct partial_die_info *spec_die;
14561 spec_die = find_partial_die (part_die->spec_offset,
14562 part_die->spec_is_dwz, cu);
14564 fixup_partial_die (spec_die, cu);
14566 if (spec_die->name)
14568 part_die->name = spec_die->name;
14570 /* Copy DW_AT_external attribute if it is set. */
14571 if (spec_die->is_external)
14572 part_die->is_external = spec_die->is_external;
14576 /* Set default names for some unnamed DIEs. */
14578 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14579 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14581 /* If there is no parent die to provide a namespace, and there are
14582 children, see if we can determine the namespace from their linkage
14584 if (cu->language == language_cplus
14585 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14586 && part_die->die_parent == NULL
14587 && part_die->has_children
14588 && (part_die->tag == DW_TAG_class_type
14589 || part_die->tag == DW_TAG_structure_type
14590 || part_die->tag == DW_TAG_union_type))
14591 guess_partial_die_structure_name (part_die, cu);
14593 /* GCC might emit a nameless struct or union that has a linkage
14594 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14595 if (part_die->name == NULL
14596 && (part_die->tag == DW_TAG_class_type
14597 || part_die->tag == DW_TAG_interface_type
14598 || part_die->tag == DW_TAG_structure_type
14599 || part_die->tag == DW_TAG_union_type)
14600 && part_die->linkage_name != NULL)
14604 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14609 /* Strip any leading namespaces/classes, keep only the base name.
14610 DW_AT_name for named DIEs does not contain the prefixes. */
14611 base = strrchr (demangled, ':');
14612 if (base && base > demangled && base[-1] == ':')
14617 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14618 base, strlen (base));
14623 part_die->fixup_called = 1;
14626 /* Read an attribute value described by an attribute form. */
14628 static const gdb_byte *
14629 read_attribute_value (const struct die_reader_specs *reader,
14630 struct attribute *attr, unsigned form,
14631 const gdb_byte *info_ptr)
14633 struct dwarf2_cu *cu = reader->cu;
14634 bfd *abfd = reader->abfd;
14635 struct comp_unit_head *cu_header = &cu->header;
14636 unsigned int bytes_read;
14637 struct dwarf_block *blk;
14642 case DW_FORM_ref_addr:
14643 if (cu->header.version == 2)
14644 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14646 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14647 &cu->header, &bytes_read);
14648 info_ptr += bytes_read;
14650 case DW_FORM_GNU_ref_alt:
14651 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14652 info_ptr += bytes_read;
14655 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14656 info_ptr += bytes_read;
14658 case DW_FORM_block2:
14659 blk = dwarf_alloc_block (cu);
14660 blk->size = read_2_bytes (abfd, info_ptr);
14662 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14663 info_ptr += blk->size;
14664 DW_BLOCK (attr) = blk;
14666 case DW_FORM_block4:
14667 blk = dwarf_alloc_block (cu);
14668 blk->size = read_4_bytes (abfd, info_ptr);
14670 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14671 info_ptr += blk->size;
14672 DW_BLOCK (attr) = blk;
14674 case DW_FORM_data2:
14675 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14678 case DW_FORM_data4:
14679 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14682 case DW_FORM_data8:
14683 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14686 case DW_FORM_sec_offset:
14687 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14688 info_ptr += bytes_read;
14690 case DW_FORM_string:
14691 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14692 DW_STRING_IS_CANONICAL (attr) = 0;
14693 info_ptr += bytes_read;
14696 if (!cu->per_cu->is_dwz)
14698 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14700 DW_STRING_IS_CANONICAL (attr) = 0;
14701 info_ptr += bytes_read;
14705 case DW_FORM_GNU_strp_alt:
14707 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14708 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14711 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14712 DW_STRING_IS_CANONICAL (attr) = 0;
14713 info_ptr += bytes_read;
14716 case DW_FORM_exprloc:
14717 case DW_FORM_block:
14718 blk = dwarf_alloc_block (cu);
14719 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14720 info_ptr += bytes_read;
14721 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14722 info_ptr += blk->size;
14723 DW_BLOCK (attr) = blk;
14725 case DW_FORM_block1:
14726 blk = dwarf_alloc_block (cu);
14727 blk->size = read_1_byte (abfd, info_ptr);
14729 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14730 info_ptr += blk->size;
14731 DW_BLOCK (attr) = blk;
14733 case DW_FORM_data1:
14734 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14738 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14741 case DW_FORM_flag_present:
14742 DW_UNSND (attr) = 1;
14744 case DW_FORM_sdata:
14745 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14746 info_ptr += bytes_read;
14748 case DW_FORM_udata:
14749 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14750 info_ptr += bytes_read;
14753 DW_UNSND (attr) = (cu->header.offset.sect_off
14754 + read_1_byte (abfd, info_ptr));
14758 DW_UNSND (attr) = (cu->header.offset.sect_off
14759 + read_2_bytes (abfd, info_ptr));
14763 DW_UNSND (attr) = (cu->header.offset.sect_off
14764 + read_4_bytes (abfd, info_ptr));
14768 DW_UNSND (attr) = (cu->header.offset.sect_off
14769 + read_8_bytes (abfd, info_ptr));
14772 case DW_FORM_ref_sig8:
14773 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14776 case DW_FORM_ref_udata:
14777 DW_UNSND (attr) = (cu->header.offset.sect_off
14778 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14779 info_ptr += bytes_read;
14781 case DW_FORM_indirect:
14782 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14783 info_ptr += bytes_read;
14784 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14786 case DW_FORM_GNU_addr_index:
14787 if (reader->dwo_file == NULL)
14789 /* For now flag a hard error.
14790 Later we can turn this into a complaint. */
14791 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14792 dwarf_form_name (form),
14793 bfd_get_filename (abfd));
14795 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14796 info_ptr += bytes_read;
14798 case DW_FORM_GNU_str_index:
14799 if (reader->dwo_file == NULL)
14801 /* For now flag a hard error.
14802 Later we can turn this into a complaint if warranted. */
14803 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14804 dwarf_form_name (form),
14805 bfd_get_filename (abfd));
14808 ULONGEST str_index =
14809 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14811 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14812 DW_STRING_IS_CANONICAL (attr) = 0;
14813 info_ptr += bytes_read;
14817 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14818 dwarf_form_name (form),
14819 bfd_get_filename (abfd));
14823 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14824 attr->form = DW_FORM_GNU_ref_alt;
14826 /* We have seen instances where the compiler tried to emit a byte
14827 size attribute of -1 which ended up being encoded as an unsigned
14828 0xffffffff. Although 0xffffffff is technically a valid size value,
14829 an object of this size seems pretty unlikely so we can relatively
14830 safely treat these cases as if the size attribute was invalid and
14831 treat them as zero by default. */
14832 if (attr->name == DW_AT_byte_size
14833 && form == DW_FORM_data4
14834 && DW_UNSND (attr) >= 0xffffffff)
14837 (&symfile_complaints,
14838 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14839 hex_string (DW_UNSND (attr)));
14840 DW_UNSND (attr) = 0;
14846 /* Read an attribute described by an abbreviated attribute. */
14848 static const gdb_byte *
14849 read_attribute (const struct die_reader_specs *reader,
14850 struct attribute *attr, struct attr_abbrev *abbrev,
14851 const gdb_byte *info_ptr)
14853 attr->name = abbrev->name;
14854 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14857 /* Read dwarf information from a buffer. */
14859 static unsigned int
14860 read_1_byte (bfd *abfd, const gdb_byte *buf)
14862 return bfd_get_8 (abfd, buf);
14866 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14868 return bfd_get_signed_8 (abfd, buf);
14871 static unsigned int
14872 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14874 return bfd_get_16 (abfd, buf);
14878 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14880 return bfd_get_signed_16 (abfd, buf);
14883 static unsigned int
14884 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14886 return bfd_get_32 (abfd, buf);
14890 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14892 return bfd_get_signed_32 (abfd, buf);
14896 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14898 return bfd_get_64 (abfd, buf);
14902 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14903 unsigned int *bytes_read)
14905 struct comp_unit_head *cu_header = &cu->header;
14906 CORE_ADDR retval = 0;
14908 if (cu_header->signed_addr_p)
14910 switch (cu_header->addr_size)
14913 retval = bfd_get_signed_16 (abfd, buf);
14916 retval = bfd_get_signed_32 (abfd, buf);
14919 retval = bfd_get_signed_64 (abfd, buf);
14922 internal_error (__FILE__, __LINE__,
14923 _("read_address: bad switch, signed [in module %s]"),
14924 bfd_get_filename (abfd));
14929 switch (cu_header->addr_size)
14932 retval = bfd_get_16 (abfd, buf);
14935 retval = bfd_get_32 (abfd, buf);
14938 retval = bfd_get_64 (abfd, buf);
14941 internal_error (__FILE__, __LINE__,
14942 _("read_address: bad switch, "
14943 "unsigned [in module %s]"),
14944 bfd_get_filename (abfd));
14948 *bytes_read = cu_header->addr_size;
14952 /* Read the initial length from a section. The (draft) DWARF 3
14953 specification allows the initial length to take up either 4 bytes
14954 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14955 bytes describe the length and all offsets will be 8 bytes in length
14958 An older, non-standard 64-bit format is also handled by this
14959 function. The older format in question stores the initial length
14960 as an 8-byte quantity without an escape value. Lengths greater
14961 than 2^32 aren't very common which means that the initial 4 bytes
14962 is almost always zero. Since a length value of zero doesn't make
14963 sense for the 32-bit format, this initial zero can be considered to
14964 be an escape value which indicates the presence of the older 64-bit
14965 format. As written, the code can't detect (old format) lengths
14966 greater than 4GB. If it becomes necessary to handle lengths
14967 somewhat larger than 4GB, we could allow other small values (such
14968 as the non-sensical values of 1, 2, and 3) to also be used as
14969 escape values indicating the presence of the old format.
14971 The value returned via bytes_read should be used to increment the
14972 relevant pointer after calling read_initial_length().
14974 [ Note: read_initial_length() and read_offset() are based on the
14975 document entitled "DWARF Debugging Information Format", revision
14976 3, draft 8, dated November 19, 2001. This document was obtained
14979 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14981 This document is only a draft and is subject to change. (So beware.)
14983 Details regarding the older, non-standard 64-bit format were
14984 determined empirically by examining 64-bit ELF files produced by
14985 the SGI toolchain on an IRIX 6.5 machine.
14987 - Kevin, July 16, 2002
14991 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
14993 LONGEST length = bfd_get_32 (abfd, buf);
14995 if (length == 0xffffffff)
14997 length = bfd_get_64 (abfd, buf + 4);
15000 else if (length == 0)
15002 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
15003 length = bfd_get_64 (abfd, buf);
15014 /* Cover function for read_initial_length.
15015 Returns the length of the object at BUF, and stores the size of the
15016 initial length in *BYTES_READ and stores the size that offsets will be in
15018 If the initial length size is not equivalent to that specified in
15019 CU_HEADER then issue a complaint.
15020 This is useful when reading non-comp-unit headers. */
15023 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
15024 const struct comp_unit_head *cu_header,
15025 unsigned int *bytes_read,
15026 unsigned int *offset_size)
15028 LONGEST length = read_initial_length (abfd, buf, bytes_read);
15030 gdb_assert (cu_header->initial_length_size == 4
15031 || cu_header->initial_length_size == 8
15032 || cu_header->initial_length_size == 12);
15034 if (cu_header->initial_length_size != *bytes_read)
15035 complaint (&symfile_complaints,
15036 _("intermixed 32-bit and 64-bit DWARF sections"));
15038 *offset_size = (*bytes_read == 4) ? 4 : 8;
15042 /* Read an offset from the data stream. The size of the offset is
15043 given by cu_header->offset_size. */
15046 read_offset (bfd *abfd, const gdb_byte *buf,
15047 const struct comp_unit_head *cu_header,
15048 unsigned int *bytes_read)
15050 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
15052 *bytes_read = cu_header->offset_size;
15056 /* Read an offset from the data stream. */
15059 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
15061 LONGEST retval = 0;
15063 switch (offset_size)
15066 retval = bfd_get_32 (abfd, buf);
15069 retval = bfd_get_64 (abfd, buf);
15072 internal_error (__FILE__, __LINE__,
15073 _("read_offset_1: bad switch [in module %s]"),
15074 bfd_get_filename (abfd));
15080 static const gdb_byte *
15081 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
15083 /* If the size of a host char is 8 bits, we can return a pointer
15084 to the buffer, otherwise we have to copy the data to a buffer
15085 allocated on the temporary obstack. */
15086 gdb_assert (HOST_CHAR_BIT == 8);
15090 static const char *
15091 read_direct_string (bfd *abfd, const gdb_byte *buf,
15092 unsigned int *bytes_read_ptr)
15094 /* If the size of a host char is 8 bits, we can return a pointer
15095 to the string, otherwise we have to copy the string to a buffer
15096 allocated on the temporary obstack. */
15097 gdb_assert (HOST_CHAR_BIT == 8);
15100 *bytes_read_ptr = 1;
15103 *bytes_read_ptr = strlen ((const char *) buf) + 1;
15104 return (const char *) buf;
15107 static const char *
15108 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
15110 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
15111 if (dwarf2_per_objfile->str.buffer == NULL)
15112 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
15113 bfd_get_filename (abfd));
15114 if (str_offset >= dwarf2_per_objfile->str.size)
15115 error (_("DW_FORM_strp pointing outside of "
15116 ".debug_str section [in module %s]"),
15117 bfd_get_filename (abfd));
15118 gdb_assert (HOST_CHAR_BIT == 8);
15119 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
15121 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
15124 /* Read a string at offset STR_OFFSET in the .debug_str section from
15125 the .dwz file DWZ. Throw an error if the offset is too large. If
15126 the string consists of a single NUL byte, return NULL; otherwise
15127 return a pointer to the string. */
15129 static const char *
15130 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
15132 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
15134 if (dwz->str.buffer == NULL)
15135 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
15136 "section [in module %s]"),
15137 bfd_get_filename (dwz->dwz_bfd));
15138 if (str_offset >= dwz->str.size)
15139 error (_("DW_FORM_GNU_strp_alt pointing outside of "
15140 ".debug_str section [in module %s]"),
15141 bfd_get_filename (dwz->dwz_bfd));
15142 gdb_assert (HOST_CHAR_BIT == 8);
15143 if (dwz->str.buffer[str_offset] == '\0')
15145 return (const char *) (dwz->str.buffer + str_offset);
15148 static const char *
15149 read_indirect_string (bfd *abfd, const gdb_byte *buf,
15150 const struct comp_unit_head *cu_header,
15151 unsigned int *bytes_read_ptr)
15153 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
15155 return read_indirect_string_at_offset (abfd, str_offset);
15159 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
15160 unsigned int *bytes_read_ptr)
15163 unsigned int num_read;
15165 unsigned char byte;
15173 byte = bfd_get_8 (abfd, buf);
15176 result |= ((ULONGEST) (byte & 127) << shift);
15177 if ((byte & 128) == 0)
15183 *bytes_read_ptr = num_read;
15188 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
15189 unsigned int *bytes_read_ptr)
15192 int i, shift, num_read;
15193 unsigned char byte;
15201 byte = bfd_get_8 (abfd, buf);
15204 result |= ((LONGEST) (byte & 127) << shift);
15206 if ((byte & 128) == 0)
15211 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
15212 result |= -(((LONGEST) 1) << shift);
15213 *bytes_read_ptr = num_read;
15217 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
15218 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
15219 ADDR_SIZE is the size of addresses from the CU header. */
15222 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
15224 struct objfile *objfile = dwarf2_per_objfile->objfile;
15225 bfd *abfd = objfile->obfd;
15226 const gdb_byte *info_ptr;
15228 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
15229 if (dwarf2_per_objfile->addr.buffer == NULL)
15230 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
15232 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
15233 error (_("DW_FORM_addr_index pointing outside of "
15234 ".debug_addr section [in module %s]"),
15236 info_ptr = (dwarf2_per_objfile->addr.buffer
15237 + addr_base + addr_index * addr_size);
15238 if (addr_size == 4)
15239 return bfd_get_32 (abfd, info_ptr);
15241 return bfd_get_64 (abfd, info_ptr);
15244 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
15247 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
15249 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
15252 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
15255 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
15256 unsigned int *bytes_read)
15258 bfd *abfd = cu->objfile->obfd;
15259 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
15261 return read_addr_index (cu, addr_index);
15264 /* Data structure to pass results from dwarf2_read_addr_index_reader
15265 back to dwarf2_read_addr_index. */
15267 struct dwarf2_read_addr_index_data
15269 ULONGEST addr_base;
15273 /* die_reader_func for dwarf2_read_addr_index. */
15276 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
15277 const gdb_byte *info_ptr,
15278 struct die_info *comp_unit_die,
15282 struct dwarf2_cu *cu = reader->cu;
15283 struct dwarf2_read_addr_index_data *aidata =
15284 (struct dwarf2_read_addr_index_data *) data;
15286 aidata->addr_base = cu->addr_base;
15287 aidata->addr_size = cu->header.addr_size;
15290 /* Given an index in .debug_addr, fetch the value.
15291 NOTE: This can be called during dwarf expression evaluation,
15292 long after the debug information has been read, and thus per_cu->cu
15293 may no longer exist. */
15296 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
15297 unsigned int addr_index)
15299 struct objfile *objfile = per_cu->objfile;
15300 struct dwarf2_cu *cu = per_cu->cu;
15301 ULONGEST addr_base;
15304 /* This is intended to be called from outside this file. */
15305 dw2_setup (objfile);
15307 /* We need addr_base and addr_size.
15308 If we don't have PER_CU->cu, we have to get it.
15309 Nasty, but the alternative is storing the needed info in PER_CU,
15310 which at this point doesn't seem justified: it's not clear how frequently
15311 it would get used and it would increase the size of every PER_CU.
15312 Entry points like dwarf2_per_cu_addr_size do a similar thing
15313 so we're not in uncharted territory here.
15314 Alas we need to be a bit more complicated as addr_base is contained
15317 We don't need to read the entire CU(/TU).
15318 We just need the header and top level die.
15320 IWBN to use the aging mechanism to let us lazily later discard the CU.
15321 For now we skip this optimization. */
15325 addr_base = cu->addr_base;
15326 addr_size = cu->header.addr_size;
15330 struct dwarf2_read_addr_index_data aidata;
15332 /* Note: We can't use init_cutu_and_read_dies_simple here,
15333 we need addr_base. */
15334 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
15335 dwarf2_read_addr_index_reader, &aidata);
15336 addr_base = aidata.addr_base;
15337 addr_size = aidata.addr_size;
15340 return read_addr_index_1 (addr_index, addr_base, addr_size);
15343 /* Given a DW_AT_str_index, fetch the string. */
15345 static const char *
15346 read_str_index (const struct die_reader_specs *reader,
15347 struct dwarf2_cu *cu, ULONGEST str_index)
15349 struct objfile *objfile = dwarf2_per_objfile->objfile;
15350 const char *dwo_name = objfile->name;
15351 bfd *abfd = objfile->obfd;
15352 struct dwo_sections *sections = &reader->dwo_file->sections;
15353 const gdb_byte *info_ptr;
15354 ULONGEST str_offset;
15356 dwarf2_read_section (objfile, §ions->str);
15357 dwarf2_read_section (objfile, §ions->str_offsets);
15358 if (sections->str.buffer == NULL)
15359 error (_("DW_FORM_str_index used without .debug_str.dwo section"
15360 " in CU at offset 0x%lx [in module %s]"),
15361 (long) cu->header.offset.sect_off, dwo_name);
15362 if (sections->str_offsets.buffer == NULL)
15363 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
15364 " in CU at offset 0x%lx [in module %s]"),
15365 (long) cu->header.offset.sect_off, dwo_name);
15366 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
15367 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
15368 " section in CU at offset 0x%lx [in module %s]"),
15369 (long) cu->header.offset.sect_off, dwo_name);
15370 info_ptr = (sections->str_offsets.buffer
15371 + str_index * cu->header.offset_size);
15372 if (cu->header.offset_size == 4)
15373 str_offset = bfd_get_32 (abfd, info_ptr);
15375 str_offset = bfd_get_64 (abfd, info_ptr);
15376 if (str_offset >= sections->str.size)
15377 error (_("Offset from DW_FORM_str_index pointing outside of"
15378 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
15379 (long) cu->header.offset.sect_off, dwo_name);
15380 return (const char *) (sections->str.buffer + str_offset);
15383 /* Return the length of an LEB128 number in BUF. */
15386 leb128_size (const gdb_byte *buf)
15388 const gdb_byte *begin = buf;
15394 if ((byte & 128) == 0)
15395 return buf - begin;
15400 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
15408 cu->language = language_c;
15410 case DW_LANG_C_plus_plus:
15411 cu->language = language_cplus;
15414 cu->language = language_d;
15416 case DW_LANG_Fortran77:
15417 case DW_LANG_Fortran90:
15418 case DW_LANG_Fortran95:
15419 cu->language = language_fortran;
15422 cu->language = language_go;
15424 case DW_LANG_Mips_Assembler:
15425 cu->language = language_asm;
15428 cu->language = language_java;
15430 case DW_LANG_Ada83:
15431 case DW_LANG_Ada95:
15432 cu->language = language_ada;
15434 case DW_LANG_Modula2:
15435 cu->language = language_m2;
15437 case DW_LANG_Pascal83:
15438 cu->language = language_pascal;
15441 cu->language = language_objc;
15443 case DW_LANG_Cobol74:
15444 case DW_LANG_Cobol85:
15446 cu->language = language_minimal;
15449 cu->language_defn = language_def (cu->language);
15452 /* Return the named attribute or NULL if not there. */
15454 static struct attribute *
15455 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15460 struct attribute *spec = NULL;
15462 for (i = 0; i < die->num_attrs; ++i)
15464 if (die->attrs[i].name == name)
15465 return &die->attrs[i];
15466 if (die->attrs[i].name == DW_AT_specification
15467 || die->attrs[i].name == DW_AT_abstract_origin)
15468 spec = &die->attrs[i];
15474 die = follow_die_ref (die, spec, &cu);
15480 /* Return the named attribute or NULL if not there,
15481 but do not follow DW_AT_specification, etc.
15482 This is for use in contexts where we're reading .debug_types dies.
15483 Following DW_AT_specification, DW_AT_abstract_origin will take us
15484 back up the chain, and we want to go down. */
15486 static struct attribute *
15487 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15491 for (i = 0; i < die->num_attrs; ++i)
15492 if (die->attrs[i].name == name)
15493 return &die->attrs[i];
15498 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15499 and holds a non-zero value. This function should only be used for
15500 DW_FORM_flag or DW_FORM_flag_present attributes. */
15503 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15505 struct attribute *attr = dwarf2_attr (die, name, cu);
15507 return (attr && DW_UNSND (attr));
15511 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15513 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15514 which value is non-zero. However, we have to be careful with
15515 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15516 (via dwarf2_flag_true_p) follows this attribute. So we may
15517 end up accidently finding a declaration attribute that belongs
15518 to a different DIE referenced by the specification attribute,
15519 even though the given DIE does not have a declaration attribute. */
15520 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15521 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15524 /* Return the die giving the specification for DIE, if there is
15525 one. *SPEC_CU is the CU containing DIE on input, and the CU
15526 containing the return value on output. If there is no
15527 specification, but there is an abstract origin, that is
15530 static struct die_info *
15531 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15533 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15536 if (spec_attr == NULL)
15537 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15539 if (spec_attr == NULL)
15542 return follow_die_ref (die, spec_attr, spec_cu);
15545 /* Free the line_header structure *LH, and any arrays and strings it
15547 NOTE: This is also used as a "cleanup" function. */
15550 free_line_header (struct line_header *lh)
15552 if (lh->standard_opcode_lengths)
15553 xfree (lh->standard_opcode_lengths);
15555 /* Remember that all the lh->file_names[i].name pointers are
15556 pointers into debug_line_buffer, and don't need to be freed. */
15557 if (lh->file_names)
15558 xfree (lh->file_names);
15560 /* Similarly for the include directory names. */
15561 if (lh->include_dirs)
15562 xfree (lh->include_dirs);
15567 /* Add an entry to LH's include directory table. */
15570 add_include_dir (struct line_header *lh, const char *include_dir)
15572 /* Grow the array if necessary. */
15573 if (lh->include_dirs_size == 0)
15575 lh->include_dirs_size = 1; /* for testing */
15576 lh->include_dirs = xmalloc (lh->include_dirs_size
15577 * sizeof (*lh->include_dirs));
15579 else if (lh->num_include_dirs >= lh->include_dirs_size)
15581 lh->include_dirs_size *= 2;
15582 lh->include_dirs = xrealloc (lh->include_dirs,
15583 (lh->include_dirs_size
15584 * sizeof (*lh->include_dirs)));
15587 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15590 /* Add an entry to LH's file name table. */
15593 add_file_name (struct line_header *lh,
15595 unsigned int dir_index,
15596 unsigned int mod_time,
15597 unsigned int length)
15599 struct file_entry *fe;
15601 /* Grow the array if necessary. */
15602 if (lh->file_names_size == 0)
15604 lh->file_names_size = 1; /* for testing */
15605 lh->file_names = xmalloc (lh->file_names_size
15606 * sizeof (*lh->file_names));
15608 else if (lh->num_file_names >= lh->file_names_size)
15610 lh->file_names_size *= 2;
15611 lh->file_names = xrealloc (lh->file_names,
15612 (lh->file_names_size
15613 * sizeof (*lh->file_names)));
15616 fe = &lh->file_names[lh->num_file_names++];
15618 fe->dir_index = dir_index;
15619 fe->mod_time = mod_time;
15620 fe->length = length;
15621 fe->included_p = 0;
15625 /* A convenience function to find the proper .debug_line section for a
15628 static struct dwarf2_section_info *
15629 get_debug_line_section (struct dwarf2_cu *cu)
15631 struct dwarf2_section_info *section;
15633 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15635 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15636 section = &cu->dwo_unit->dwo_file->sections.line;
15637 else if (cu->per_cu->is_dwz)
15639 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15641 section = &dwz->line;
15644 section = &dwarf2_per_objfile->line;
15649 /* Read the statement program header starting at OFFSET in
15650 .debug_line, or .debug_line.dwo. Return a pointer
15651 to a struct line_header, allocated using xmalloc.
15653 NOTE: the strings in the include directory and file name tables of
15654 the returned object point into the dwarf line section buffer,
15655 and must not be freed. */
15657 static struct line_header *
15658 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15660 struct cleanup *back_to;
15661 struct line_header *lh;
15662 const gdb_byte *line_ptr;
15663 unsigned int bytes_read, offset_size;
15665 const char *cur_dir, *cur_file;
15666 struct dwarf2_section_info *section;
15669 section = get_debug_line_section (cu);
15670 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15671 if (section->buffer == NULL)
15673 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15674 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15676 complaint (&symfile_complaints, _("missing .debug_line section"));
15680 /* We can't do this until we know the section is non-empty.
15681 Only then do we know we have such a section. */
15682 abfd = section->asection->owner;
15684 /* Make sure that at least there's room for the total_length field.
15685 That could be 12 bytes long, but we're just going to fudge that. */
15686 if (offset + 4 >= section->size)
15688 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15692 lh = xmalloc (sizeof (*lh));
15693 memset (lh, 0, sizeof (*lh));
15694 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15697 line_ptr = section->buffer + offset;
15699 /* Read in the header. */
15701 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15702 &bytes_read, &offset_size);
15703 line_ptr += bytes_read;
15704 if (line_ptr + lh->total_length > (section->buffer + section->size))
15706 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15709 lh->statement_program_end = line_ptr + lh->total_length;
15710 lh->version = read_2_bytes (abfd, line_ptr);
15712 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15713 line_ptr += offset_size;
15714 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15716 if (lh->version >= 4)
15718 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15722 lh->maximum_ops_per_instruction = 1;
15724 if (lh->maximum_ops_per_instruction == 0)
15726 lh->maximum_ops_per_instruction = 1;
15727 complaint (&symfile_complaints,
15728 _("invalid maximum_ops_per_instruction "
15729 "in `.debug_line' section"));
15732 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15734 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15736 lh->line_range = read_1_byte (abfd, line_ptr);
15738 lh->opcode_base = read_1_byte (abfd, line_ptr);
15740 lh->standard_opcode_lengths
15741 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15743 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15744 for (i = 1; i < lh->opcode_base; ++i)
15746 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15750 /* Read directory table. */
15751 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15753 line_ptr += bytes_read;
15754 add_include_dir (lh, cur_dir);
15756 line_ptr += bytes_read;
15758 /* Read file name table. */
15759 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15761 unsigned int dir_index, mod_time, length;
15763 line_ptr += bytes_read;
15764 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15765 line_ptr += bytes_read;
15766 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15767 line_ptr += bytes_read;
15768 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15769 line_ptr += bytes_read;
15771 add_file_name (lh, cur_file, dir_index, mod_time, length);
15773 line_ptr += bytes_read;
15774 lh->statement_program_start = line_ptr;
15776 if (line_ptr > (section->buffer + section->size))
15777 complaint (&symfile_complaints,
15778 _("line number info header doesn't "
15779 "fit in `.debug_line' section"));
15781 discard_cleanups (back_to);
15785 /* Subroutine of dwarf_decode_lines to simplify it.
15786 Return the file name of the psymtab for included file FILE_INDEX
15787 in line header LH of PST.
15788 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15789 If space for the result is malloc'd, it will be freed by a cleanup.
15790 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15792 The function creates dangling cleanup registration. */
15794 static const char *
15795 psymtab_include_file_name (const struct line_header *lh, int file_index,
15796 const struct partial_symtab *pst,
15797 const char *comp_dir)
15799 const struct file_entry fe = lh->file_names [file_index];
15800 const char *include_name = fe.name;
15801 const char *include_name_to_compare = include_name;
15802 const char *dir_name = NULL;
15803 const char *pst_filename;
15804 char *copied_name = NULL;
15808 dir_name = lh->include_dirs[fe.dir_index - 1];
15810 if (!IS_ABSOLUTE_PATH (include_name)
15811 && (dir_name != NULL || comp_dir != NULL))
15813 /* Avoid creating a duplicate psymtab for PST.
15814 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15815 Before we do the comparison, however, we need to account
15816 for DIR_NAME and COMP_DIR.
15817 First prepend dir_name (if non-NULL). If we still don't
15818 have an absolute path prepend comp_dir (if non-NULL).
15819 However, the directory we record in the include-file's
15820 psymtab does not contain COMP_DIR (to match the
15821 corresponding symtab(s)).
15826 bash$ gcc -g ./hello.c
15827 include_name = "hello.c"
15829 DW_AT_comp_dir = comp_dir = "/tmp"
15830 DW_AT_name = "./hello.c" */
15832 if (dir_name != NULL)
15834 char *tem = concat (dir_name, SLASH_STRING,
15835 include_name, (char *)NULL);
15837 make_cleanup (xfree, tem);
15838 include_name = tem;
15839 include_name_to_compare = include_name;
15841 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15843 char *tem = concat (comp_dir, SLASH_STRING,
15844 include_name, (char *)NULL);
15846 make_cleanup (xfree, tem);
15847 include_name_to_compare = tem;
15851 pst_filename = pst->filename;
15852 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15854 copied_name = concat (pst->dirname, SLASH_STRING,
15855 pst_filename, (char *)NULL);
15856 pst_filename = copied_name;
15859 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15861 if (copied_name != NULL)
15862 xfree (copied_name);
15866 return include_name;
15869 /* Ignore this record_line request. */
15872 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15877 /* Subroutine of dwarf_decode_lines to simplify it.
15878 Process the line number information in LH. */
15881 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15882 struct dwarf2_cu *cu, struct partial_symtab *pst)
15884 const gdb_byte *line_ptr, *extended_end;
15885 const gdb_byte *line_end;
15886 unsigned int bytes_read, extended_len;
15887 unsigned char op_code, extended_op, adj_opcode;
15888 CORE_ADDR baseaddr;
15889 struct objfile *objfile = cu->objfile;
15890 bfd *abfd = objfile->obfd;
15891 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15892 const int decode_for_pst_p = (pst != NULL);
15893 struct subfile *last_subfile = NULL;
15894 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15897 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15899 line_ptr = lh->statement_program_start;
15900 line_end = lh->statement_program_end;
15902 /* Read the statement sequences until there's nothing left. */
15903 while (line_ptr < line_end)
15905 /* state machine registers */
15906 CORE_ADDR address = 0;
15907 unsigned int file = 1;
15908 unsigned int line = 1;
15909 unsigned int column = 0;
15910 int is_stmt = lh->default_is_stmt;
15911 int basic_block = 0;
15912 int end_sequence = 0;
15914 unsigned char op_index = 0;
15916 if (!decode_for_pst_p && lh->num_file_names >= file)
15918 /* Start a subfile for the current file of the state machine. */
15919 /* lh->include_dirs and lh->file_names are 0-based, but the
15920 directory and file name numbers in the statement program
15922 struct file_entry *fe = &lh->file_names[file - 1];
15923 const char *dir = NULL;
15926 dir = lh->include_dirs[fe->dir_index - 1];
15928 dwarf2_start_subfile (fe->name, dir, comp_dir);
15931 /* Decode the table. */
15932 while (!end_sequence)
15934 op_code = read_1_byte (abfd, line_ptr);
15936 if (line_ptr > line_end)
15938 dwarf2_debug_line_missing_end_sequence_complaint ();
15942 if (op_code >= lh->opcode_base)
15944 /* Special operand. */
15945 adj_opcode = op_code - lh->opcode_base;
15946 address += (((op_index + (adj_opcode / lh->line_range))
15947 / lh->maximum_ops_per_instruction)
15948 * lh->minimum_instruction_length);
15949 op_index = ((op_index + (adj_opcode / lh->line_range))
15950 % lh->maximum_ops_per_instruction);
15951 line += lh->line_base + (adj_opcode % lh->line_range);
15952 if (lh->num_file_names < file || file == 0)
15953 dwarf2_debug_line_missing_file_complaint ();
15954 /* For now we ignore lines not starting on an
15955 instruction boundary. */
15956 else if (op_index == 0)
15958 lh->file_names[file - 1].included_p = 1;
15959 if (!decode_for_pst_p && is_stmt)
15961 if (last_subfile != current_subfile)
15963 addr = gdbarch_addr_bits_remove (gdbarch, address);
15965 (*p_record_line) (last_subfile, 0, addr);
15966 last_subfile = current_subfile;
15968 /* Append row to matrix using current values. */
15969 addr = gdbarch_addr_bits_remove (gdbarch, address);
15970 (*p_record_line) (current_subfile, line, addr);
15975 else switch (op_code)
15977 case DW_LNS_extended_op:
15978 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15980 line_ptr += bytes_read;
15981 extended_end = line_ptr + extended_len;
15982 extended_op = read_1_byte (abfd, line_ptr);
15984 switch (extended_op)
15986 case DW_LNE_end_sequence:
15987 p_record_line = record_line;
15990 case DW_LNE_set_address:
15991 address = read_address (abfd, line_ptr, cu, &bytes_read);
15993 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15995 /* This line table is for a function which has been
15996 GCd by the linker. Ignore it. PR gdb/12528 */
15999 = line_ptr - get_debug_line_section (cu)->buffer;
16001 complaint (&symfile_complaints,
16002 _(".debug_line address at offset 0x%lx is 0 "
16004 line_offset, objfile->name);
16005 p_record_line = noop_record_line;
16009 line_ptr += bytes_read;
16010 address += baseaddr;
16012 case DW_LNE_define_file:
16014 const char *cur_file;
16015 unsigned int dir_index, mod_time, length;
16017 cur_file = read_direct_string (abfd, line_ptr,
16019 line_ptr += bytes_read;
16021 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16022 line_ptr += bytes_read;
16024 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16025 line_ptr += bytes_read;
16027 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16028 line_ptr += bytes_read;
16029 add_file_name (lh, cur_file, dir_index, mod_time, length);
16032 case DW_LNE_set_discriminator:
16033 /* The discriminator is not interesting to the debugger;
16035 line_ptr = extended_end;
16038 complaint (&symfile_complaints,
16039 _("mangled .debug_line section"));
16042 /* Make sure that we parsed the extended op correctly. If e.g.
16043 we expected a different address size than the producer used,
16044 we may have read the wrong number of bytes. */
16045 if (line_ptr != extended_end)
16047 complaint (&symfile_complaints,
16048 _("mangled .debug_line section"));
16053 if (lh->num_file_names < file || file == 0)
16054 dwarf2_debug_line_missing_file_complaint ();
16057 lh->file_names[file - 1].included_p = 1;
16058 if (!decode_for_pst_p && is_stmt)
16060 if (last_subfile != current_subfile)
16062 addr = gdbarch_addr_bits_remove (gdbarch, address);
16064 (*p_record_line) (last_subfile, 0, addr);
16065 last_subfile = current_subfile;
16067 addr = gdbarch_addr_bits_remove (gdbarch, address);
16068 (*p_record_line) (current_subfile, line, addr);
16073 case DW_LNS_advance_pc:
16076 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16078 address += (((op_index + adjust)
16079 / lh->maximum_ops_per_instruction)
16080 * lh->minimum_instruction_length);
16081 op_index = ((op_index + adjust)
16082 % lh->maximum_ops_per_instruction);
16083 line_ptr += bytes_read;
16086 case DW_LNS_advance_line:
16087 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
16088 line_ptr += bytes_read;
16090 case DW_LNS_set_file:
16092 /* The arrays lh->include_dirs and lh->file_names are
16093 0-based, but the directory and file name numbers in
16094 the statement program are 1-based. */
16095 struct file_entry *fe;
16096 const char *dir = NULL;
16098 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16099 line_ptr += bytes_read;
16100 if (lh->num_file_names < file || file == 0)
16101 dwarf2_debug_line_missing_file_complaint ();
16104 fe = &lh->file_names[file - 1];
16106 dir = lh->include_dirs[fe->dir_index - 1];
16107 if (!decode_for_pst_p)
16109 last_subfile = current_subfile;
16110 dwarf2_start_subfile (fe->name, dir, comp_dir);
16115 case DW_LNS_set_column:
16116 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16117 line_ptr += bytes_read;
16119 case DW_LNS_negate_stmt:
16120 is_stmt = (!is_stmt);
16122 case DW_LNS_set_basic_block:
16125 /* Add to the address register of the state machine the
16126 address increment value corresponding to special opcode
16127 255. I.e., this value is scaled by the minimum
16128 instruction length since special opcode 255 would have
16129 scaled the increment. */
16130 case DW_LNS_const_add_pc:
16132 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
16134 address += (((op_index + adjust)
16135 / lh->maximum_ops_per_instruction)
16136 * lh->minimum_instruction_length);
16137 op_index = ((op_index + adjust)
16138 % lh->maximum_ops_per_instruction);
16141 case DW_LNS_fixed_advance_pc:
16142 address += read_2_bytes (abfd, line_ptr);
16148 /* Unknown standard opcode, ignore it. */
16151 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
16153 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16154 line_ptr += bytes_read;
16159 if (lh->num_file_names < file || file == 0)
16160 dwarf2_debug_line_missing_file_complaint ();
16163 lh->file_names[file - 1].included_p = 1;
16164 if (!decode_for_pst_p)
16166 addr = gdbarch_addr_bits_remove (gdbarch, address);
16167 (*p_record_line) (current_subfile, 0, addr);
16173 /* Decode the Line Number Program (LNP) for the given line_header
16174 structure and CU. The actual information extracted and the type
16175 of structures created from the LNP depends on the value of PST.
16177 1. If PST is NULL, then this procedure uses the data from the program
16178 to create all necessary symbol tables, and their linetables.
16180 2. If PST is not NULL, this procedure reads the program to determine
16181 the list of files included by the unit represented by PST, and
16182 builds all the associated partial symbol tables.
16184 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16185 It is used for relative paths in the line table.
16186 NOTE: When processing partial symtabs (pst != NULL),
16187 comp_dir == pst->dirname.
16189 NOTE: It is important that psymtabs have the same file name (via strcmp)
16190 as the corresponding symtab. Since COMP_DIR is not used in the name of the
16191 symtab we don't use it in the name of the psymtabs we create.
16192 E.g. expand_line_sal requires this when finding psymtabs to expand.
16193 A good testcase for this is mb-inline.exp. */
16196 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
16197 struct dwarf2_cu *cu, struct partial_symtab *pst,
16198 int want_line_info)
16200 struct objfile *objfile = cu->objfile;
16201 const int decode_for_pst_p = (pst != NULL);
16202 struct subfile *first_subfile = current_subfile;
16204 if (want_line_info)
16205 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
16207 if (decode_for_pst_p)
16211 /* Now that we're done scanning the Line Header Program, we can
16212 create the psymtab of each included file. */
16213 for (file_index = 0; file_index < lh->num_file_names; file_index++)
16214 if (lh->file_names[file_index].included_p == 1)
16216 const char *include_name =
16217 psymtab_include_file_name (lh, file_index, pst, comp_dir);
16218 if (include_name != NULL)
16219 dwarf2_create_include_psymtab (include_name, pst, objfile);
16224 /* Make sure a symtab is created for every file, even files
16225 which contain only variables (i.e. no code with associated
16229 for (i = 0; i < lh->num_file_names; i++)
16231 const char *dir = NULL;
16232 struct file_entry *fe;
16234 fe = &lh->file_names[i];
16236 dir = lh->include_dirs[fe->dir_index - 1];
16237 dwarf2_start_subfile (fe->name, dir, comp_dir);
16239 /* Skip the main file; we don't need it, and it must be
16240 allocated last, so that it will show up before the
16241 non-primary symtabs in the objfile's symtab list. */
16242 if (current_subfile == first_subfile)
16245 if (current_subfile->symtab == NULL)
16246 current_subfile->symtab = allocate_symtab (current_subfile->name,
16248 fe->symtab = current_subfile->symtab;
16253 /* Start a subfile for DWARF. FILENAME is the name of the file and
16254 DIRNAME the name of the source directory which contains FILENAME
16255 or NULL if not known. COMP_DIR is the compilation directory for the
16256 linetable's compilation unit or NULL if not known.
16257 This routine tries to keep line numbers from identical absolute and
16258 relative file names in a common subfile.
16260 Using the `list' example from the GDB testsuite, which resides in
16261 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
16262 of /srcdir/list0.c yields the following debugging information for list0.c:
16264 DW_AT_name: /srcdir/list0.c
16265 DW_AT_comp_dir: /compdir
16266 files.files[0].name: list0.h
16267 files.files[0].dir: /srcdir
16268 files.files[1].name: list0.c
16269 files.files[1].dir: /srcdir
16271 The line number information for list0.c has to end up in a single
16272 subfile, so that `break /srcdir/list0.c:1' works as expected.
16273 start_subfile will ensure that this happens provided that we pass the
16274 concatenation of files.files[1].dir and files.files[1].name as the
16278 dwarf2_start_subfile (const char *filename, const char *dirname,
16279 const char *comp_dir)
16283 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
16284 `start_symtab' will always pass the contents of DW_AT_comp_dir as
16285 second argument to start_subfile. To be consistent, we do the
16286 same here. In order not to lose the line information directory,
16287 we concatenate it to the filename when it makes sense.
16288 Note that the Dwarf3 standard says (speaking of filenames in line
16289 information): ``The directory index is ignored for file names
16290 that represent full path names''. Thus ignoring dirname in the
16291 `else' branch below isn't an issue. */
16293 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
16295 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
16299 start_subfile (filename, comp_dir);
16305 /* Start a symtab for DWARF.
16306 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
16309 dwarf2_start_symtab (struct dwarf2_cu *cu,
16310 const char *name, const char *comp_dir, CORE_ADDR low_pc)
16312 start_symtab (name, comp_dir, low_pc);
16313 record_debugformat ("DWARF 2");
16314 record_producer (cu->producer);
16316 /* We assume that we're processing GCC output. */
16317 processing_gcc_compilation = 2;
16319 cu->processing_has_namespace_info = 0;
16323 var_decode_location (struct attribute *attr, struct symbol *sym,
16324 struct dwarf2_cu *cu)
16326 struct objfile *objfile = cu->objfile;
16327 struct comp_unit_head *cu_header = &cu->header;
16329 /* NOTE drow/2003-01-30: There used to be a comment and some special
16330 code here to turn a symbol with DW_AT_external and a
16331 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
16332 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
16333 with some versions of binutils) where shared libraries could have
16334 relocations against symbols in their debug information - the
16335 minimal symbol would have the right address, but the debug info
16336 would not. It's no longer necessary, because we will explicitly
16337 apply relocations when we read in the debug information now. */
16339 /* A DW_AT_location attribute with no contents indicates that a
16340 variable has been optimized away. */
16341 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
16343 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16347 /* Handle one degenerate form of location expression specially, to
16348 preserve GDB's previous behavior when section offsets are
16349 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
16350 then mark this symbol as LOC_STATIC. */
16352 if (attr_form_is_block (attr)
16353 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
16354 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
16355 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
16356 && (DW_BLOCK (attr)->size
16357 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
16359 unsigned int dummy;
16361 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
16362 SYMBOL_VALUE_ADDRESS (sym) =
16363 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
16365 SYMBOL_VALUE_ADDRESS (sym) =
16366 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
16367 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
16368 fixup_symbol_section (sym, objfile);
16369 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
16370 SYMBOL_SECTION (sym));
16374 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
16375 expression evaluator, and use LOC_COMPUTED only when necessary
16376 (i.e. when the value of a register or memory location is
16377 referenced, or a thread-local block, etc.). Then again, it might
16378 not be worthwhile. I'm assuming that it isn't unless performance
16379 or memory numbers show me otherwise. */
16381 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
16383 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
16384 cu->has_loclist = 1;
16387 /* Given a pointer to a DWARF information entry, figure out if we need
16388 to make a symbol table entry for it, and if so, create a new entry
16389 and return a pointer to it.
16390 If TYPE is NULL, determine symbol type from the die, otherwise
16391 used the passed type.
16392 If SPACE is not NULL, use it to hold the new symbol. If it is
16393 NULL, allocate a new symbol on the objfile's obstack. */
16395 static struct symbol *
16396 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
16397 struct symbol *space)
16399 struct objfile *objfile = cu->objfile;
16400 struct symbol *sym = NULL;
16402 struct attribute *attr = NULL;
16403 struct attribute *attr2 = NULL;
16404 CORE_ADDR baseaddr;
16405 struct pending **list_to_add = NULL;
16407 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
16409 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
16411 name = dwarf2_name (die, cu);
16414 const char *linkagename;
16415 int suppress_add = 0;
16420 sym = allocate_symbol (objfile);
16421 OBJSTAT (objfile, n_syms++);
16423 /* Cache this symbol's name and the name's demangled form (if any). */
16424 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
16425 linkagename = dwarf2_physname (name, die, cu);
16426 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
16428 /* Fortran does not have mangling standard and the mangling does differ
16429 between gfortran, iFort etc. */
16430 if (cu->language == language_fortran
16431 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
16432 symbol_set_demangled_name (&(sym->ginfo),
16433 dwarf2_full_name (name, die, cu),
16436 /* Default assumptions.
16437 Use the passed type or decode it from the die. */
16438 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16439 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16441 SYMBOL_TYPE (sym) = type;
16443 SYMBOL_TYPE (sym) = die_type (die, cu);
16444 attr = dwarf2_attr (die,
16445 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16449 SYMBOL_LINE (sym) = DW_UNSND (attr);
16452 attr = dwarf2_attr (die,
16453 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16457 int file_index = DW_UNSND (attr);
16459 if (cu->line_header == NULL
16460 || file_index > cu->line_header->num_file_names)
16461 complaint (&symfile_complaints,
16462 _("file index out of range"));
16463 else if (file_index > 0)
16465 struct file_entry *fe;
16467 fe = &cu->line_header->file_names[file_index - 1];
16468 SYMBOL_SYMTAB (sym) = fe->symtab;
16475 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16478 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16480 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16481 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16482 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16483 add_symbol_to_list (sym, cu->list_in_scope);
16485 case DW_TAG_subprogram:
16486 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16488 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16489 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16490 if ((attr2 && (DW_UNSND (attr2) != 0))
16491 || cu->language == language_ada)
16493 /* Subprograms marked external are stored as a global symbol.
16494 Ada subprograms, whether marked external or not, are always
16495 stored as a global symbol, because we want to be able to
16496 access them globally. For instance, we want to be able
16497 to break on a nested subprogram without having to
16498 specify the context. */
16499 list_to_add = &global_symbols;
16503 list_to_add = cu->list_in_scope;
16506 case DW_TAG_inlined_subroutine:
16507 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16509 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16510 SYMBOL_INLINED (sym) = 1;
16511 list_to_add = cu->list_in_scope;
16513 case DW_TAG_template_value_param:
16515 /* Fall through. */
16516 case DW_TAG_constant:
16517 case DW_TAG_variable:
16518 case DW_TAG_member:
16519 /* Compilation with minimal debug info may result in
16520 variables with missing type entries. Change the
16521 misleading `void' type to something sensible. */
16522 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16524 = objfile_type (objfile)->nodebug_data_symbol;
16526 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16527 /* In the case of DW_TAG_member, we should only be called for
16528 static const members. */
16529 if (die->tag == DW_TAG_member)
16531 /* dwarf2_add_field uses die_is_declaration,
16532 so we do the same. */
16533 gdb_assert (die_is_declaration (die, cu));
16538 dwarf2_const_value (attr, sym, cu);
16539 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16542 if (attr2 && (DW_UNSND (attr2) != 0))
16543 list_to_add = &global_symbols;
16545 list_to_add = cu->list_in_scope;
16549 attr = dwarf2_attr (die, DW_AT_location, cu);
16552 var_decode_location (attr, sym, cu);
16553 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16555 /* Fortran explicitly imports any global symbols to the local
16556 scope by DW_TAG_common_block. */
16557 if (cu->language == language_fortran && die->parent
16558 && die->parent->tag == DW_TAG_common_block)
16561 if (SYMBOL_CLASS (sym) == LOC_STATIC
16562 && SYMBOL_VALUE_ADDRESS (sym) == 0
16563 && !dwarf2_per_objfile->has_section_at_zero)
16565 /* When a static variable is eliminated by the linker,
16566 the corresponding debug information is not stripped
16567 out, but the variable address is set to null;
16568 do not add such variables into symbol table. */
16570 else if (attr2 && (DW_UNSND (attr2) != 0))
16572 /* Workaround gfortran PR debug/40040 - it uses
16573 DW_AT_location for variables in -fPIC libraries which may
16574 get overriden by other libraries/executable and get
16575 a different address. Resolve it by the minimal symbol
16576 which may come from inferior's executable using copy
16577 relocation. Make this workaround only for gfortran as for
16578 other compilers GDB cannot guess the minimal symbol
16579 Fortran mangling kind. */
16580 if (cu->language == language_fortran && die->parent
16581 && die->parent->tag == DW_TAG_module
16583 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16584 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16586 /* A variable with DW_AT_external is never static,
16587 but it may be block-scoped. */
16588 list_to_add = (cu->list_in_scope == &file_symbols
16589 ? &global_symbols : cu->list_in_scope);
16592 list_to_add = cu->list_in_scope;
16596 /* We do not know the address of this symbol.
16597 If it is an external symbol and we have type information
16598 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16599 The address of the variable will then be determined from
16600 the minimal symbol table whenever the variable is
16602 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16604 /* Fortran explicitly imports any global symbols to the local
16605 scope by DW_TAG_common_block. */
16606 if (cu->language == language_fortran && die->parent
16607 && die->parent->tag == DW_TAG_common_block)
16609 /* SYMBOL_CLASS doesn't matter here because
16610 read_common_block is going to reset it. */
16612 list_to_add = cu->list_in_scope;
16614 else if (attr2 && (DW_UNSND (attr2) != 0)
16615 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16617 /* A variable with DW_AT_external is never static, but it
16618 may be block-scoped. */
16619 list_to_add = (cu->list_in_scope == &file_symbols
16620 ? &global_symbols : cu->list_in_scope);
16622 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16624 else if (!die_is_declaration (die, cu))
16626 /* Use the default LOC_OPTIMIZED_OUT class. */
16627 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16629 list_to_add = cu->list_in_scope;
16633 case DW_TAG_formal_parameter:
16634 /* If we are inside a function, mark this as an argument. If
16635 not, we might be looking at an argument to an inlined function
16636 when we do not have enough information to show inlined frames;
16637 pretend it's a local variable in that case so that the user can
16639 if (context_stack_depth > 0
16640 && context_stack[context_stack_depth - 1].name != NULL)
16641 SYMBOL_IS_ARGUMENT (sym) = 1;
16642 attr = dwarf2_attr (die, DW_AT_location, cu);
16645 var_decode_location (attr, sym, cu);
16647 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16650 dwarf2_const_value (attr, sym, cu);
16653 list_to_add = cu->list_in_scope;
16655 case DW_TAG_unspecified_parameters:
16656 /* From varargs functions; gdb doesn't seem to have any
16657 interest in this information, so just ignore it for now.
16660 case DW_TAG_template_type_param:
16662 /* Fall through. */
16663 case DW_TAG_class_type:
16664 case DW_TAG_interface_type:
16665 case DW_TAG_structure_type:
16666 case DW_TAG_union_type:
16667 case DW_TAG_set_type:
16668 case DW_TAG_enumeration_type:
16669 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16670 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16673 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16674 really ever be static objects: otherwise, if you try
16675 to, say, break of a class's method and you're in a file
16676 which doesn't mention that class, it won't work unless
16677 the check for all static symbols in lookup_symbol_aux
16678 saves you. See the OtherFileClass tests in
16679 gdb.c++/namespace.exp. */
16683 list_to_add = (cu->list_in_scope == &file_symbols
16684 && (cu->language == language_cplus
16685 || cu->language == language_java)
16686 ? &global_symbols : cu->list_in_scope);
16688 /* The semantics of C++ state that "struct foo {
16689 ... }" also defines a typedef for "foo". A Java
16690 class declaration also defines a typedef for the
16692 if (cu->language == language_cplus
16693 || cu->language == language_java
16694 || cu->language == language_ada)
16696 /* The symbol's name is already allocated along
16697 with this objfile, so we don't need to
16698 duplicate it for the type. */
16699 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16700 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16705 case DW_TAG_typedef:
16706 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16707 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16708 list_to_add = cu->list_in_scope;
16710 case DW_TAG_base_type:
16711 case DW_TAG_subrange_type:
16712 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16713 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16714 list_to_add = cu->list_in_scope;
16716 case DW_TAG_enumerator:
16717 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16720 dwarf2_const_value (attr, sym, cu);
16723 /* NOTE: carlton/2003-11-10: See comment above in the
16724 DW_TAG_class_type, etc. block. */
16726 list_to_add = (cu->list_in_scope == &file_symbols
16727 && (cu->language == language_cplus
16728 || cu->language == language_java)
16729 ? &global_symbols : cu->list_in_scope);
16732 case DW_TAG_namespace:
16733 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16734 list_to_add = &global_symbols;
16736 case DW_TAG_common_block:
16737 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16738 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16739 add_symbol_to_list (sym, cu->list_in_scope);
16742 /* Not a tag we recognize. Hopefully we aren't processing
16743 trash data, but since we must specifically ignore things
16744 we don't recognize, there is nothing else we should do at
16746 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16747 dwarf_tag_name (die->tag));
16753 sym->hash_next = objfile->template_symbols;
16754 objfile->template_symbols = sym;
16755 list_to_add = NULL;
16758 if (list_to_add != NULL)
16759 add_symbol_to_list (sym, list_to_add);
16761 /* For the benefit of old versions of GCC, check for anonymous
16762 namespaces based on the demangled name. */
16763 if (!cu->processing_has_namespace_info
16764 && cu->language == language_cplus)
16765 cp_scan_for_anonymous_namespaces (sym, objfile);
16770 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16772 static struct symbol *
16773 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16775 return new_symbol_full (die, type, cu, NULL);
16778 /* Given an attr with a DW_FORM_dataN value in host byte order,
16779 zero-extend it as appropriate for the symbol's type. The DWARF
16780 standard (v4) is not entirely clear about the meaning of using
16781 DW_FORM_dataN for a constant with a signed type, where the type is
16782 wider than the data. The conclusion of a discussion on the DWARF
16783 list was that this is unspecified. We choose to always zero-extend
16784 because that is the interpretation long in use by GCC. */
16787 dwarf2_const_value_data (struct attribute *attr, struct obstack *obstack,
16788 struct dwarf2_cu *cu, LONGEST *value, int bits)
16790 struct objfile *objfile = cu->objfile;
16791 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16792 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16793 LONGEST l = DW_UNSND (attr);
16795 if (bits < sizeof (*value) * 8)
16797 l &= ((LONGEST) 1 << bits) - 1;
16800 else if (bits == sizeof (*value) * 8)
16804 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16805 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16812 /* Read a constant value from an attribute. Either set *VALUE, or if
16813 the value does not fit in *VALUE, set *BYTES - either already
16814 allocated on the objfile obstack, or newly allocated on OBSTACK,
16815 or, set *BATON, if we translated the constant to a location
16819 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16820 const char *name, struct obstack *obstack,
16821 struct dwarf2_cu *cu,
16822 LONGEST *value, const gdb_byte **bytes,
16823 struct dwarf2_locexpr_baton **baton)
16825 struct objfile *objfile = cu->objfile;
16826 struct comp_unit_head *cu_header = &cu->header;
16827 struct dwarf_block *blk;
16828 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16829 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16835 switch (attr->form)
16838 case DW_FORM_GNU_addr_index:
16842 if (TYPE_LENGTH (type) != cu_header->addr_size)
16843 dwarf2_const_value_length_mismatch_complaint (name,
16844 cu_header->addr_size,
16845 TYPE_LENGTH (type));
16846 /* Symbols of this form are reasonably rare, so we just
16847 piggyback on the existing location code rather than writing
16848 a new implementation of symbol_computed_ops. */
16849 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
16850 (*baton)->per_cu = cu->per_cu;
16851 gdb_assert ((*baton)->per_cu);
16853 (*baton)->size = 2 + cu_header->addr_size;
16854 data = obstack_alloc (obstack, (*baton)->size);
16855 (*baton)->data = data;
16857 data[0] = DW_OP_addr;
16858 store_unsigned_integer (&data[1], cu_header->addr_size,
16859 byte_order, DW_ADDR (attr));
16860 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16863 case DW_FORM_string:
16865 case DW_FORM_GNU_str_index:
16866 case DW_FORM_GNU_strp_alt:
16867 /* DW_STRING is already allocated on the objfile obstack, point
16869 *bytes = (const gdb_byte *) DW_STRING (attr);
16871 case DW_FORM_block1:
16872 case DW_FORM_block2:
16873 case DW_FORM_block4:
16874 case DW_FORM_block:
16875 case DW_FORM_exprloc:
16876 blk = DW_BLOCK (attr);
16877 if (TYPE_LENGTH (type) != blk->size)
16878 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16879 TYPE_LENGTH (type));
16880 *bytes = blk->data;
16883 /* The DW_AT_const_value attributes are supposed to carry the
16884 symbol's value "represented as it would be on the target
16885 architecture." By the time we get here, it's already been
16886 converted to host endianness, so we just need to sign- or
16887 zero-extend it as appropriate. */
16888 case DW_FORM_data1:
16889 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
16891 case DW_FORM_data2:
16892 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
16894 case DW_FORM_data4:
16895 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
16897 case DW_FORM_data8:
16898 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
16901 case DW_FORM_sdata:
16902 *value = DW_SND (attr);
16905 case DW_FORM_udata:
16906 *value = DW_UNSND (attr);
16910 complaint (&symfile_complaints,
16911 _("unsupported const value attribute form: '%s'"),
16912 dwarf_form_name (attr->form));
16919 /* Copy constant value from an attribute to a symbol. */
16922 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16923 struct dwarf2_cu *cu)
16925 struct objfile *objfile = cu->objfile;
16926 struct comp_unit_head *cu_header = &cu->header;
16928 const gdb_byte *bytes;
16929 struct dwarf2_locexpr_baton *baton;
16931 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16932 SYMBOL_PRINT_NAME (sym),
16933 &objfile->objfile_obstack, cu,
16934 &value, &bytes, &baton);
16938 SYMBOL_LOCATION_BATON (sym) = baton;
16939 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16941 else if (bytes != NULL)
16943 SYMBOL_VALUE_BYTES (sym) = bytes;
16944 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16948 SYMBOL_VALUE (sym) = value;
16949 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16953 /* Return the type of the die in question using its DW_AT_type attribute. */
16955 static struct type *
16956 die_type (struct die_info *die, struct dwarf2_cu *cu)
16958 struct attribute *type_attr;
16960 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16963 /* A missing DW_AT_type represents a void type. */
16964 return objfile_type (cu->objfile)->builtin_void;
16967 return lookup_die_type (die, type_attr, cu);
16970 /* True iff CU's producer generates GNAT Ada auxiliary information
16971 that allows to find parallel types through that information instead
16972 of having to do expensive parallel lookups by type name. */
16975 need_gnat_info (struct dwarf2_cu *cu)
16977 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16978 of GNAT produces this auxiliary information, without any indication
16979 that it is produced. Part of enhancing the FSF version of GNAT
16980 to produce that information will be to put in place an indicator
16981 that we can use in order to determine whether the descriptive type
16982 info is available or not. One suggestion that has been made is
16983 to use a new attribute, attached to the CU die. For now, assume
16984 that the descriptive type info is not available. */
16988 /* Return the auxiliary type of the die in question using its
16989 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16990 attribute is not present. */
16992 static struct type *
16993 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16995 struct attribute *type_attr;
16997 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
17001 return lookup_die_type (die, type_attr, cu);
17004 /* If DIE has a descriptive_type attribute, then set the TYPE's
17005 descriptive type accordingly. */
17008 set_descriptive_type (struct type *type, struct die_info *die,
17009 struct dwarf2_cu *cu)
17011 struct type *descriptive_type = die_descriptive_type (die, cu);
17013 if (descriptive_type)
17015 ALLOCATE_GNAT_AUX_TYPE (type);
17016 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
17020 /* Return the containing type of the die in question using its
17021 DW_AT_containing_type attribute. */
17023 static struct type *
17024 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
17026 struct attribute *type_attr;
17028 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
17030 error (_("Dwarf Error: Problem turning containing type into gdb type "
17031 "[in module %s]"), cu->objfile->name);
17033 return lookup_die_type (die, type_attr, cu);
17036 /* Return an error marker type to use for the ill formed type in DIE/CU. */
17038 static struct type *
17039 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
17041 struct objfile *objfile = dwarf2_per_objfile->objfile;
17042 char *message, *saved;
17044 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
17046 cu->header.offset.sect_off,
17047 die->offset.sect_off);
17048 saved = obstack_copy0 (&objfile->objfile_obstack,
17049 message, strlen (message));
17052 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
17055 /* Look up the type of DIE in CU using its type attribute ATTR.
17056 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
17057 DW_AT_containing_type.
17058 If there is no type substitute an error marker. */
17060 static struct type *
17061 lookup_die_type (struct die_info *die, struct attribute *attr,
17062 struct dwarf2_cu *cu)
17064 struct objfile *objfile = cu->objfile;
17065 struct type *this_type;
17067 gdb_assert (attr->name == DW_AT_type
17068 || attr->name == DW_AT_GNAT_descriptive_type
17069 || attr->name == DW_AT_containing_type);
17071 /* First see if we have it cached. */
17073 if (attr->form == DW_FORM_GNU_ref_alt)
17075 struct dwarf2_per_cu_data *per_cu;
17076 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17078 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
17079 this_type = get_die_type_at_offset (offset, per_cu);
17081 else if (is_ref_attr (attr))
17083 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17085 this_type = get_die_type_at_offset (offset, cu->per_cu);
17087 else if (attr->form == DW_FORM_ref_sig8)
17089 ULONGEST signature = DW_SIGNATURE (attr);
17091 return get_signatured_type (die, signature, cu);
17095 complaint (&symfile_complaints,
17096 _("Dwarf Error: Bad type attribute %s in DIE"
17097 " at 0x%x [in module %s]"),
17098 dwarf_attr_name (attr->name), die->offset.sect_off,
17100 return build_error_marker_type (cu, die);
17103 /* If not cached we need to read it in. */
17105 if (this_type == NULL)
17107 struct die_info *type_die = NULL;
17108 struct dwarf2_cu *type_cu = cu;
17110 if (is_ref_attr (attr))
17111 type_die = follow_die_ref (die, attr, &type_cu);
17112 if (type_die == NULL)
17113 return build_error_marker_type (cu, die);
17114 /* If we find the type now, it's probably because the type came
17115 from an inter-CU reference and the type's CU got expanded before
17117 this_type = read_type_die (type_die, type_cu);
17120 /* If we still don't have a type use an error marker. */
17122 if (this_type == NULL)
17123 return build_error_marker_type (cu, die);
17128 /* Return the type in DIE, CU.
17129 Returns NULL for invalid types.
17131 This first does a lookup in die_type_hash,
17132 and only reads the die in if necessary.
17134 NOTE: This can be called when reading in partial or full symbols. */
17136 static struct type *
17137 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
17139 struct type *this_type;
17141 this_type = get_die_type (die, cu);
17145 return read_type_die_1 (die, cu);
17148 /* Read the type in DIE, CU.
17149 Returns NULL for invalid types. */
17151 static struct type *
17152 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
17154 struct type *this_type = NULL;
17158 case DW_TAG_class_type:
17159 case DW_TAG_interface_type:
17160 case DW_TAG_structure_type:
17161 case DW_TAG_union_type:
17162 this_type = read_structure_type (die, cu);
17164 case DW_TAG_enumeration_type:
17165 this_type = read_enumeration_type (die, cu);
17167 case DW_TAG_subprogram:
17168 case DW_TAG_subroutine_type:
17169 case DW_TAG_inlined_subroutine:
17170 this_type = read_subroutine_type (die, cu);
17172 case DW_TAG_array_type:
17173 this_type = read_array_type (die, cu);
17175 case DW_TAG_set_type:
17176 this_type = read_set_type (die, cu);
17178 case DW_TAG_pointer_type:
17179 this_type = read_tag_pointer_type (die, cu);
17181 case DW_TAG_ptr_to_member_type:
17182 this_type = read_tag_ptr_to_member_type (die, cu);
17184 case DW_TAG_reference_type:
17185 this_type = read_tag_reference_type (die, cu);
17187 case DW_TAG_const_type:
17188 this_type = read_tag_const_type (die, cu);
17190 case DW_TAG_volatile_type:
17191 this_type = read_tag_volatile_type (die, cu);
17193 case DW_TAG_restrict_type:
17194 this_type = read_tag_restrict_type (die, cu);
17196 case DW_TAG_string_type:
17197 this_type = read_tag_string_type (die, cu);
17199 case DW_TAG_typedef:
17200 this_type = read_typedef (die, cu);
17202 case DW_TAG_subrange_type:
17203 this_type = read_subrange_type (die, cu);
17205 case DW_TAG_base_type:
17206 this_type = read_base_type (die, cu);
17208 case DW_TAG_unspecified_type:
17209 this_type = read_unspecified_type (die, cu);
17211 case DW_TAG_namespace:
17212 this_type = read_namespace_type (die, cu);
17214 case DW_TAG_module:
17215 this_type = read_module_type (die, cu);
17218 complaint (&symfile_complaints,
17219 _("unexpected tag in read_type_die: '%s'"),
17220 dwarf_tag_name (die->tag));
17227 /* See if we can figure out if the class lives in a namespace. We do
17228 this by looking for a member function; its demangled name will
17229 contain namespace info, if there is any.
17230 Return the computed name or NULL.
17231 Space for the result is allocated on the objfile's obstack.
17232 This is the full-die version of guess_partial_die_structure_name.
17233 In this case we know DIE has no useful parent. */
17236 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
17238 struct die_info *spec_die;
17239 struct dwarf2_cu *spec_cu;
17240 struct die_info *child;
17243 spec_die = die_specification (die, &spec_cu);
17244 if (spec_die != NULL)
17250 for (child = die->child;
17252 child = child->sibling)
17254 if (child->tag == DW_TAG_subprogram)
17256 struct attribute *attr;
17258 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
17260 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
17264 = language_class_name_from_physname (cu->language_defn,
17268 if (actual_name != NULL)
17270 const char *die_name = dwarf2_name (die, cu);
17272 if (die_name != NULL
17273 && strcmp (die_name, actual_name) != 0)
17275 /* Strip off the class name from the full name.
17276 We want the prefix. */
17277 int die_name_len = strlen (die_name);
17278 int actual_name_len = strlen (actual_name);
17280 /* Test for '::' as a sanity check. */
17281 if (actual_name_len > die_name_len + 2
17282 && actual_name[actual_name_len
17283 - die_name_len - 1] == ':')
17285 obstack_copy0 (&cu->objfile->objfile_obstack,
17287 actual_name_len - die_name_len - 2);
17290 xfree (actual_name);
17299 /* GCC might emit a nameless typedef that has a linkage name. Determine the
17300 prefix part in such case. See
17301 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17304 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
17306 struct attribute *attr;
17309 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
17310 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
17313 attr = dwarf2_attr (die, DW_AT_name, cu);
17314 if (attr != NULL && DW_STRING (attr) != NULL)
17317 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17319 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17320 if (attr == NULL || DW_STRING (attr) == NULL)
17323 /* dwarf2_name had to be already called. */
17324 gdb_assert (DW_STRING_IS_CANONICAL (attr));
17326 /* Strip the base name, keep any leading namespaces/classes. */
17327 base = strrchr (DW_STRING (attr), ':');
17328 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
17331 return obstack_copy0 (&cu->objfile->objfile_obstack,
17332 DW_STRING (attr), &base[-1] - DW_STRING (attr));
17335 /* Return the name of the namespace/class that DIE is defined within,
17336 or "" if we can't tell. The caller should not xfree the result.
17338 For example, if we're within the method foo() in the following
17348 then determine_prefix on foo's die will return "N::C". */
17350 static const char *
17351 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
17353 struct die_info *parent, *spec_die;
17354 struct dwarf2_cu *spec_cu;
17355 struct type *parent_type;
17358 if (cu->language != language_cplus && cu->language != language_java
17359 && cu->language != language_fortran)
17362 retval = anonymous_struct_prefix (die, cu);
17366 /* We have to be careful in the presence of DW_AT_specification.
17367 For example, with GCC 3.4, given the code
17371 // Definition of N::foo.
17375 then we'll have a tree of DIEs like this:
17377 1: DW_TAG_compile_unit
17378 2: DW_TAG_namespace // N
17379 3: DW_TAG_subprogram // declaration of N::foo
17380 4: DW_TAG_subprogram // definition of N::foo
17381 DW_AT_specification // refers to die #3
17383 Thus, when processing die #4, we have to pretend that we're in
17384 the context of its DW_AT_specification, namely the contex of die
17387 spec_die = die_specification (die, &spec_cu);
17388 if (spec_die == NULL)
17389 parent = die->parent;
17392 parent = spec_die->parent;
17396 if (parent == NULL)
17398 else if (parent->building_fullname)
17401 const char *parent_name;
17403 /* It has been seen on RealView 2.2 built binaries,
17404 DW_TAG_template_type_param types actually _defined_ as
17405 children of the parent class:
17408 template class <class Enum> Class{};
17409 Class<enum E> class_e;
17411 1: DW_TAG_class_type (Class)
17412 2: DW_TAG_enumeration_type (E)
17413 3: DW_TAG_enumerator (enum1:0)
17414 3: DW_TAG_enumerator (enum2:1)
17416 2: DW_TAG_template_type_param
17417 DW_AT_type DW_FORM_ref_udata (E)
17419 Besides being broken debug info, it can put GDB into an
17420 infinite loop. Consider:
17422 When we're building the full name for Class<E>, we'll start
17423 at Class, and go look over its template type parameters,
17424 finding E. We'll then try to build the full name of E, and
17425 reach here. We're now trying to build the full name of E,
17426 and look over the parent DIE for containing scope. In the
17427 broken case, if we followed the parent DIE of E, we'd again
17428 find Class, and once again go look at its template type
17429 arguments, etc., etc. Simply don't consider such parent die
17430 as source-level parent of this die (it can't be, the language
17431 doesn't allow it), and break the loop here. */
17432 name = dwarf2_name (die, cu);
17433 parent_name = dwarf2_name (parent, cu);
17434 complaint (&symfile_complaints,
17435 _("template param type '%s' defined within parent '%s'"),
17436 name ? name : "<unknown>",
17437 parent_name ? parent_name : "<unknown>");
17441 switch (parent->tag)
17443 case DW_TAG_namespace:
17444 parent_type = read_type_die (parent, cu);
17445 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17446 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17447 Work around this problem here. */
17448 if (cu->language == language_cplus
17449 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17451 /* We give a name to even anonymous namespaces. */
17452 return TYPE_TAG_NAME (parent_type);
17453 case DW_TAG_class_type:
17454 case DW_TAG_interface_type:
17455 case DW_TAG_structure_type:
17456 case DW_TAG_union_type:
17457 case DW_TAG_module:
17458 parent_type = read_type_die (parent, cu);
17459 if (TYPE_TAG_NAME (parent_type) != NULL)
17460 return TYPE_TAG_NAME (parent_type);
17462 /* An anonymous structure is only allowed non-static data
17463 members; no typedefs, no member functions, et cetera.
17464 So it does not need a prefix. */
17466 case DW_TAG_compile_unit:
17467 case DW_TAG_partial_unit:
17468 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17469 if (cu->language == language_cplus
17470 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17471 && die->child != NULL
17472 && (die->tag == DW_TAG_class_type
17473 || die->tag == DW_TAG_structure_type
17474 || die->tag == DW_TAG_union_type))
17476 char *name = guess_full_die_structure_name (die, cu);
17482 return determine_prefix (parent, cu);
17486 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17487 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17488 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17489 an obconcat, otherwise allocate storage for the result. The CU argument is
17490 used to determine the language and hence, the appropriate separator. */
17492 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17495 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17496 int physname, struct dwarf2_cu *cu)
17498 const char *lead = "";
17501 if (suffix == NULL || suffix[0] == '\0'
17502 || prefix == NULL || prefix[0] == '\0')
17504 else if (cu->language == language_java)
17506 else if (cu->language == language_fortran && physname)
17508 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17509 DW_AT_MIPS_linkage_name is preferred and used instead. */
17517 if (prefix == NULL)
17519 if (suffix == NULL)
17525 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17527 strcpy (retval, lead);
17528 strcat (retval, prefix);
17529 strcat (retval, sep);
17530 strcat (retval, suffix);
17535 /* We have an obstack. */
17536 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17540 /* Return sibling of die, NULL if no sibling. */
17542 static struct die_info *
17543 sibling_die (struct die_info *die)
17545 return die->sibling;
17548 /* Get name of a die, return NULL if not found. */
17550 static const char *
17551 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17552 struct obstack *obstack)
17554 if (name && cu->language == language_cplus)
17556 char *canon_name = cp_canonicalize_string (name);
17558 if (canon_name != NULL)
17560 if (strcmp (canon_name, name) != 0)
17561 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17562 xfree (canon_name);
17569 /* Get name of a die, return NULL if not found. */
17571 static const char *
17572 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17574 struct attribute *attr;
17576 attr = dwarf2_attr (die, DW_AT_name, cu);
17577 if ((!attr || !DW_STRING (attr))
17578 && die->tag != DW_TAG_class_type
17579 && die->tag != DW_TAG_interface_type
17580 && die->tag != DW_TAG_structure_type
17581 && die->tag != DW_TAG_union_type)
17586 case DW_TAG_compile_unit:
17587 case DW_TAG_partial_unit:
17588 /* Compilation units have a DW_AT_name that is a filename, not
17589 a source language identifier. */
17590 case DW_TAG_enumeration_type:
17591 case DW_TAG_enumerator:
17592 /* These tags always have simple identifiers already; no need
17593 to canonicalize them. */
17594 return DW_STRING (attr);
17596 case DW_TAG_subprogram:
17597 /* Java constructors will all be named "<init>", so return
17598 the class name when we see this special case. */
17599 if (cu->language == language_java
17600 && DW_STRING (attr) != NULL
17601 && strcmp (DW_STRING (attr), "<init>") == 0)
17603 struct dwarf2_cu *spec_cu = cu;
17604 struct die_info *spec_die;
17606 /* GCJ will output '<init>' for Java constructor names.
17607 For this special case, return the name of the parent class. */
17609 /* GCJ may output suprogram DIEs with AT_specification set.
17610 If so, use the name of the specified DIE. */
17611 spec_die = die_specification (die, &spec_cu);
17612 if (spec_die != NULL)
17613 return dwarf2_name (spec_die, spec_cu);
17618 if (die->tag == DW_TAG_class_type)
17619 return dwarf2_name (die, cu);
17621 while (die->tag != DW_TAG_compile_unit
17622 && die->tag != DW_TAG_partial_unit);
17626 case DW_TAG_class_type:
17627 case DW_TAG_interface_type:
17628 case DW_TAG_structure_type:
17629 case DW_TAG_union_type:
17630 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17631 structures or unions. These were of the form "._%d" in GCC 4.1,
17632 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17633 and GCC 4.4. We work around this problem by ignoring these. */
17634 if (attr && DW_STRING (attr)
17635 && (strncmp (DW_STRING (attr), "._", 2) == 0
17636 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17639 /* GCC might emit a nameless typedef that has a linkage name. See
17640 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17641 if (!attr || DW_STRING (attr) == NULL)
17643 char *demangled = NULL;
17645 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17647 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17649 if (attr == NULL || DW_STRING (attr) == NULL)
17652 /* Avoid demangling DW_STRING (attr) the second time on a second
17653 call for the same DIE. */
17654 if (!DW_STRING_IS_CANONICAL (attr))
17655 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17661 /* FIXME: we already did this for the partial symbol... */
17662 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17663 demangled, strlen (demangled));
17664 DW_STRING_IS_CANONICAL (attr) = 1;
17667 /* Strip any leading namespaces/classes, keep only the base name.
17668 DW_AT_name for named DIEs does not contain the prefixes. */
17669 base = strrchr (DW_STRING (attr), ':');
17670 if (base && base > DW_STRING (attr) && base[-1] == ':')
17673 return DW_STRING (attr);
17682 if (!DW_STRING_IS_CANONICAL (attr))
17685 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17686 &cu->objfile->objfile_obstack);
17687 DW_STRING_IS_CANONICAL (attr) = 1;
17689 return DW_STRING (attr);
17692 /* Return the die that this die in an extension of, or NULL if there
17693 is none. *EXT_CU is the CU containing DIE on input, and the CU
17694 containing the return value on output. */
17696 static struct die_info *
17697 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17699 struct attribute *attr;
17701 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17705 return follow_die_ref (die, attr, ext_cu);
17708 /* Convert a DIE tag into its string name. */
17710 static const char *
17711 dwarf_tag_name (unsigned tag)
17713 const char *name = get_DW_TAG_name (tag);
17716 return "DW_TAG_<unknown>";
17721 /* Convert a DWARF attribute code into its string name. */
17723 static const char *
17724 dwarf_attr_name (unsigned attr)
17728 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17729 if (attr == DW_AT_MIPS_fde)
17730 return "DW_AT_MIPS_fde";
17732 if (attr == DW_AT_HP_block_index)
17733 return "DW_AT_HP_block_index";
17736 name = get_DW_AT_name (attr);
17739 return "DW_AT_<unknown>";
17744 /* Convert a DWARF value form code into its string name. */
17746 static const char *
17747 dwarf_form_name (unsigned form)
17749 const char *name = get_DW_FORM_name (form);
17752 return "DW_FORM_<unknown>";
17758 dwarf_bool_name (unsigned mybool)
17766 /* Convert a DWARF type code into its string name. */
17768 static const char *
17769 dwarf_type_encoding_name (unsigned enc)
17771 const char *name = get_DW_ATE_name (enc);
17774 return "DW_ATE_<unknown>";
17780 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17784 print_spaces (indent, f);
17785 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17786 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17788 if (die->parent != NULL)
17790 print_spaces (indent, f);
17791 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17792 die->parent->offset.sect_off);
17795 print_spaces (indent, f);
17796 fprintf_unfiltered (f, " has children: %s\n",
17797 dwarf_bool_name (die->child != NULL));
17799 print_spaces (indent, f);
17800 fprintf_unfiltered (f, " attributes:\n");
17802 for (i = 0; i < die->num_attrs; ++i)
17804 print_spaces (indent, f);
17805 fprintf_unfiltered (f, " %s (%s) ",
17806 dwarf_attr_name (die->attrs[i].name),
17807 dwarf_form_name (die->attrs[i].form));
17809 switch (die->attrs[i].form)
17812 case DW_FORM_GNU_addr_index:
17813 fprintf_unfiltered (f, "address: ");
17814 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17816 case DW_FORM_block2:
17817 case DW_FORM_block4:
17818 case DW_FORM_block:
17819 case DW_FORM_block1:
17820 fprintf_unfiltered (f, "block: size %s",
17821 pulongest (DW_BLOCK (&die->attrs[i])->size));
17823 case DW_FORM_exprloc:
17824 fprintf_unfiltered (f, "expression: size %s",
17825 pulongest (DW_BLOCK (&die->attrs[i])->size));
17827 case DW_FORM_ref_addr:
17828 fprintf_unfiltered (f, "ref address: ");
17829 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17831 case DW_FORM_GNU_ref_alt:
17832 fprintf_unfiltered (f, "alt ref address: ");
17833 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17839 case DW_FORM_ref_udata:
17840 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17841 (long) (DW_UNSND (&die->attrs[i])));
17843 case DW_FORM_data1:
17844 case DW_FORM_data2:
17845 case DW_FORM_data4:
17846 case DW_FORM_data8:
17847 case DW_FORM_udata:
17848 case DW_FORM_sdata:
17849 fprintf_unfiltered (f, "constant: %s",
17850 pulongest (DW_UNSND (&die->attrs[i])));
17852 case DW_FORM_sec_offset:
17853 fprintf_unfiltered (f, "section offset: %s",
17854 pulongest (DW_UNSND (&die->attrs[i])));
17856 case DW_FORM_ref_sig8:
17857 fprintf_unfiltered (f, "signature: %s",
17858 hex_string (DW_SIGNATURE (&die->attrs[i])));
17860 case DW_FORM_string:
17862 case DW_FORM_GNU_str_index:
17863 case DW_FORM_GNU_strp_alt:
17864 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17865 DW_STRING (&die->attrs[i])
17866 ? DW_STRING (&die->attrs[i]) : "",
17867 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17870 if (DW_UNSND (&die->attrs[i]))
17871 fprintf_unfiltered (f, "flag: TRUE");
17873 fprintf_unfiltered (f, "flag: FALSE");
17875 case DW_FORM_flag_present:
17876 fprintf_unfiltered (f, "flag: TRUE");
17878 case DW_FORM_indirect:
17879 /* The reader will have reduced the indirect form to
17880 the "base form" so this form should not occur. */
17881 fprintf_unfiltered (f,
17882 "unexpected attribute form: DW_FORM_indirect");
17885 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17886 die->attrs[i].form);
17889 fprintf_unfiltered (f, "\n");
17894 dump_die_for_error (struct die_info *die)
17896 dump_die_shallow (gdb_stderr, 0, die);
17900 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17902 int indent = level * 4;
17904 gdb_assert (die != NULL);
17906 if (level >= max_level)
17909 dump_die_shallow (f, indent, die);
17911 if (die->child != NULL)
17913 print_spaces (indent, f);
17914 fprintf_unfiltered (f, " Children:");
17915 if (level + 1 < max_level)
17917 fprintf_unfiltered (f, "\n");
17918 dump_die_1 (f, level + 1, max_level, die->child);
17922 fprintf_unfiltered (f,
17923 " [not printed, max nesting level reached]\n");
17927 if (die->sibling != NULL && level > 0)
17929 dump_die_1 (f, level, max_level, die->sibling);
17933 /* This is called from the pdie macro in gdbinit.in.
17934 It's not static so gcc will keep a copy callable from gdb. */
17937 dump_die (struct die_info *die, int max_level)
17939 dump_die_1 (gdb_stdlog, 0, max_level, die);
17943 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17947 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17953 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17954 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17957 is_ref_attr (struct attribute *attr)
17959 switch (attr->form)
17961 case DW_FORM_ref_addr:
17966 case DW_FORM_ref_udata:
17967 case DW_FORM_GNU_ref_alt:
17974 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17978 dwarf2_get_ref_die_offset (struct attribute *attr)
17980 sect_offset retval = { DW_UNSND (attr) };
17982 if (is_ref_attr (attr))
17985 retval.sect_off = 0;
17986 complaint (&symfile_complaints,
17987 _("unsupported die ref attribute form: '%s'"),
17988 dwarf_form_name (attr->form));
17992 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17993 * the value held by the attribute is not constant. */
17996 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17998 if (attr->form == DW_FORM_sdata)
17999 return DW_SND (attr);
18000 else if (attr->form == DW_FORM_udata
18001 || attr->form == DW_FORM_data1
18002 || attr->form == DW_FORM_data2
18003 || attr->form == DW_FORM_data4
18004 || attr->form == DW_FORM_data8)
18005 return DW_UNSND (attr);
18008 complaint (&symfile_complaints,
18009 _("Attribute value is not a constant (%s)"),
18010 dwarf_form_name (attr->form));
18011 return default_value;
18015 /* Follow reference or signature attribute ATTR of SRC_DIE.
18016 On entry *REF_CU is the CU of SRC_DIE.
18017 On exit *REF_CU is the CU of the result. */
18019 static struct die_info *
18020 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
18021 struct dwarf2_cu **ref_cu)
18023 struct die_info *die;
18025 if (is_ref_attr (attr))
18026 die = follow_die_ref (src_die, attr, ref_cu);
18027 else if (attr->form == DW_FORM_ref_sig8)
18028 die = follow_die_sig (src_die, attr, ref_cu);
18031 dump_die_for_error (src_die);
18032 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
18033 (*ref_cu)->objfile->name);
18039 /* Follow reference OFFSET.
18040 On entry *REF_CU is the CU of the source die referencing OFFSET.
18041 On exit *REF_CU is the CU of the result.
18042 Returns NULL if OFFSET is invalid. */
18044 static struct die_info *
18045 follow_die_offset (sect_offset offset, int offset_in_dwz,
18046 struct dwarf2_cu **ref_cu)
18048 struct die_info temp_die;
18049 struct dwarf2_cu *target_cu, *cu = *ref_cu;
18051 gdb_assert (cu->per_cu != NULL);
18055 if (cu->per_cu->is_debug_types)
18057 /* .debug_types CUs cannot reference anything outside their CU.
18058 If they need to, they have to reference a signatured type via
18059 DW_FORM_ref_sig8. */
18060 if (! offset_in_cu_p (&cu->header, offset))
18063 else if (offset_in_dwz != cu->per_cu->is_dwz
18064 || ! offset_in_cu_p (&cu->header, offset))
18066 struct dwarf2_per_cu_data *per_cu;
18068 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
18071 /* If necessary, add it to the queue and load its DIEs. */
18072 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
18073 load_full_comp_unit (per_cu, cu->language);
18075 target_cu = per_cu->cu;
18077 else if (cu->dies == NULL)
18079 /* We're loading full DIEs during partial symbol reading. */
18080 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
18081 load_full_comp_unit (cu->per_cu, language_minimal);
18084 *ref_cu = target_cu;
18085 temp_die.offset = offset;
18086 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
18089 /* Follow reference attribute ATTR of SRC_DIE.
18090 On entry *REF_CU is the CU of SRC_DIE.
18091 On exit *REF_CU is the CU of the result. */
18093 static struct die_info *
18094 follow_die_ref (struct die_info *src_die, struct attribute *attr,
18095 struct dwarf2_cu **ref_cu)
18097 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18098 struct dwarf2_cu *cu = *ref_cu;
18099 struct die_info *die;
18101 die = follow_die_offset (offset,
18102 (attr->form == DW_FORM_GNU_ref_alt
18103 || cu->per_cu->is_dwz),
18106 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
18107 "at 0x%x [in module %s]"),
18108 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
18113 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
18114 Returned value is intended for DW_OP_call*. Returned
18115 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
18117 struct dwarf2_locexpr_baton
18118 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
18119 struct dwarf2_per_cu_data *per_cu,
18120 CORE_ADDR (*get_frame_pc) (void *baton),
18123 struct dwarf2_cu *cu;
18124 struct die_info *die;
18125 struct attribute *attr;
18126 struct dwarf2_locexpr_baton retval;
18128 dw2_setup (per_cu->objfile);
18130 if (per_cu->cu == NULL)
18134 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18136 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18137 offset.sect_off, per_cu->objfile->name);
18139 attr = dwarf2_attr (die, DW_AT_location, cu);
18142 /* DWARF: "If there is no such attribute, then there is no effect.".
18143 DATA is ignored if SIZE is 0. */
18145 retval.data = NULL;
18148 else if (attr_form_is_section_offset (attr))
18150 struct dwarf2_loclist_baton loclist_baton;
18151 CORE_ADDR pc = (*get_frame_pc) (baton);
18154 fill_in_loclist_baton (cu, &loclist_baton, attr);
18156 retval.data = dwarf2_find_location_expression (&loclist_baton,
18158 retval.size = size;
18162 if (!attr_form_is_block (attr))
18163 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
18164 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
18165 offset.sect_off, per_cu->objfile->name);
18167 retval.data = DW_BLOCK (attr)->data;
18168 retval.size = DW_BLOCK (attr)->size;
18170 retval.per_cu = cu->per_cu;
18172 age_cached_comp_units ();
18177 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
18180 struct dwarf2_locexpr_baton
18181 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
18182 struct dwarf2_per_cu_data *per_cu,
18183 CORE_ADDR (*get_frame_pc) (void *baton),
18186 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
18188 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
18191 /* Write a constant of a given type as target-ordered bytes into
18194 static const gdb_byte *
18195 write_constant_as_bytes (struct obstack *obstack,
18196 enum bfd_endian byte_order,
18203 *len = TYPE_LENGTH (type);
18204 result = obstack_alloc (obstack, *len);
18205 store_unsigned_integer (result, *len, byte_order, value);
18210 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
18211 pointer to the constant bytes and set LEN to the length of the
18212 data. If memory is needed, allocate it on OBSTACK. If the DIE
18213 does not have a DW_AT_const_value, return NULL. */
18216 dwarf2_fetch_constant_bytes (sect_offset offset,
18217 struct dwarf2_per_cu_data *per_cu,
18218 struct obstack *obstack,
18221 struct dwarf2_cu *cu;
18222 struct die_info *die;
18223 struct attribute *attr;
18224 const gdb_byte *result = NULL;
18227 enum bfd_endian byte_order;
18229 dw2_setup (per_cu->objfile);
18231 if (per_cu->cu == NULL)
18235 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18237 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18238 offset.sect_off, per_cu->objfile->name);
18241 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18245 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
18246 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18248 switch (attr->form)
18251 case DW_FORM_GNU_addr_index:
18255 *len = cu->header.addr_size;
18256 tem = obstack_alloc (obstack, *len);
18257 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
18261 case DW_FORM_string:
18263 case DW_FORM_GNU_str_index:
18264 case DW_FORM_GNU_strp_alt:
18265 /* DW_STRING is already allocated on the objfile obstack, point
18267 result = (const gdb_byte *) DW_STRING (attr);
18268 *len = strlen (DW_STRING (attr));
18270 case DW_FORM_block1:
18271 case DW_FORM_block2:
18272 case DW_FORM_block4:
18273 case DW_FORM_block:
18274 case DW_FORM_exprloc:
18275 result = DW_BLOCK (attr)->data;
18276 *len = DW_BLOCK (attr)->size;
18279 /* The DW_AT_const_value attributes are supposed to carry the
18280 symbol's value "represented as it would be on the target
18281 architecture." By the time we get here, it's already been
18282 converted to host endianness, so we just need to sign- or
18283 zero-extend it as appropriate. */
18284 case DW_FORM_data1:
18285 type = die_type (die, cu);
18286 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
18287 if (result == NULL)
18288 result = write_constant_as_bytes (obstack, byte_order,
18291 case DW_FORM_data2:
18292 type = die_type (die, cu);
18293 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
18294 if (result == NULL)
18295 result = write_constant_as_bytes (obstack, byte_order,
18298 case DW_FORM_data4:
18299 type = die_type (die, cu);
18300 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
18301 if (result == NULL)
18302 result = write_constant_as_bytes (obstack, byte_order,
18305 case DW_FORM_data8:
18306 type = die_type (die, cu);
18307 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
18308 if (result == NULL)
18309 result = write_constant_as_bytes (obstack, byte_order,
18313 case DW_FORM_sdata:
18314 type = die_type (die, cu);
18315 result = write_constant_as_bytes (obstack, byte_order,
18316 type, DW_SND (attr), len);
18319 case DW_FORM_udata:
18320 type = die_type (die, cu);
18321 result = write_constant_as_bytes (obstack, byte_order,
18322 type, DW_UNSND (attr), len);
18326 complaint (&symfile_complaints,
18327 _("unsupported const value attribute form: '%s'"),
18328 dwarf_form_name (attr->form));
18335 /* Return the type of the DIE at DIE_OFFSET in the CU named by
18339 dwarf2_get_die_type (cu_offset die_offset,
18340 struct dwarf2_per_cu_data *per_cu)
18342 sect_offset die_offset_sect;
18344 dw2_setup (per_cu->objfile);
18346 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
18347 return get_die_type_at_offset (die_offset_sect, per_cu);
18350 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
18351 On entry *REF_CU is the CU of SRC_DIE.
18352 On exit *REF_CU is the CU of the result.
18353 Returns NULL if the referenced DIE isn't found. */
18355 static struct die_info *
18356 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
18357 struct dwarf2_cu **ref_cu)
18359 struct objfile *objfile = (*ref_cu)->objfile;
18360 struct die_info temp_die;
18361 struct dwarf2_cu *sig_cu;
18362 struct die_info *die;
18364 /* While it might be nice to assert sig_type->type == NULL here,
18365 we can get here for DW_AT_imported_declaration where we need
18366 the DIE not the type. */
18368 /* If necessary, add it to the queue and load its DIEs. */
18370 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
18371 read_signatured_type (sig_type);
18373 gdb_assert (sig_type->per_cu.cu != NULL);
18375 sig_cu = sig_type->per_cu.cu;
18376 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
18377 temp_die.offset = sig_type->type_offset_in_section;
18378 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
18379 temp_die.offset.sect_off);
18382 /* For .gdb_index version 7 keep track of included TUs.
18383 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
18384 if (dwarf2_per_objfile->index_table != NULL
18385 && dwarf2_per_objfile->index_table->version <= 7)
18387 VEC_safe_push (dwarf2_per_cu_ptr,
18388 (*ref_cu)->per_cu->imported_symtabs,
18399 /* Follow signatured type referenced by ATTR in SRC_DIE.
18400 On entry *REF_CU is the CU of SRC_DIE.
18401 On exit *REF_CU is the CU of the result.
18402 The result is the DIE of the type.
18403 If the referenced type cannot be found an error is thrown. */
18405 static struct die_info *
18406 follow_die_sig (struct die_info *src_die, struct attribute *attr,
18407 struct dwarf2_cu **ref_cu)
18409 ULONGEST signature = DW_SIGNATURE (attr);
18410 struct signatured_type *sig_type;
18411 struct die_info *die;
18413 gdb_assert (attr->form == DW_FORM_ref_sig8);
18415 sig_type = lookup_signatured_type (*ref_cu, signature);
18416 /* sig_type will be NULL if the signatured type is missing from
18418 if (sig_type == NULL)
18420 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
18421 " from DIE at 0x%x [in module %s]"),
18422 hex_string (signature), src_die->offset.sect_off,
18423 (*ref_cu)->objfile->name);
18426 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
18429 dump_die_for_error (src_die);
18430 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
18431 " from DIE at 0x%x [in module %s]"),
18432 hex_string (signature), src_die->offset.sect_off,
18433 (*ref_cu)->objfile->name);
18439 /* Get the type specified by SIGNATURE referenced in DIE/CU,
18440 reading in and processing the type unit if necessary. */
18442 static struct type *
18443 get_signatured_type (struct die_info *die, ULONGEST signature,
18444 struct dwarf2_cu *cu)
18446 struct signatured_type *sig_type;
18447 struct dwarf2_cu *type_cu;
18448 struct die_info *type_die;
18451 sig_type = lookup_signatured_type (cu, signature);
18452 /* sig_type will be NULL if the signatured type is missing from
18454 if (sig_type == NULL)
18456 complaint (&symfile_complaints,
18457 _("Dwarf Error: Cannot find signatured DIE %s referenced"
18458 " from DIE at 0x%x [in module %s]"),
18459 hex_string (signature), die->offset.sect_off,
18460 dwarf2_per_objfile->objfile->name);
18461 return build_error_marker_type (cu, die);
18464 /* If we already know the type we're done. */
18465 if (sig_type->type != NULL)
18466 return sig_type->type;
18469 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
18470 if (type_die != NULL)
18472 /* N.B. We need to call get_die_type to ensure only one type for this DIE
18473 is created. This is important, for example, because for c++ classes
18474 we need TYPE_NAME set which is only done by new_symbol. Blech. */
18475 type = read_type_die (type_die, type_cu);
18478 complaint (&symfile_complaints,
18479 _("Dwarf Error: Cannot build signatured type %s"
18480 " referenced from DIE at 0x%x [in module %s]"),
18481 hex_string (signature), die->offset.sect_off,
18482 dwarf2_per_objfile->objfile->name);
18483 type = build_error_marker_type (cu, die);
18488 complaint (&symfile_complaints,
18489 _("Dwarf Error: Problem reading signatured DIE %s referenced"
18490 " from DIE at 0x%x [in module %s]"),
18491 hex_string (signature), die->offset.sect_off,
18492 dwarf2_per_objfile->objfile->name);
18493 type = build_error_marker_type (cu, die);
18495 sig_type->type = type;
18500 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
18501 reading in and processing the type unit if necessary. */
18503 static struct type *
18504 get_DW_AT_signature_type (struct die_info *die, struct attribute *attr,
18505 struct dwarf2_cu *cu) /* ARI: editCase function */
18507 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
18508 if (is_ref_attr (attr))
18510 struct dwarf2_cu *type_cu = cu;
18511 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
18513 return read_type_die (type_die, type_cu);
18515 else if (attr->form == DW_FORM_ref_sig8)
18517 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
18521 complaint (&symfile_complaints,
18522 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
18523 " at 0x%x [in module %s]"),
18524 dwarf_form_name (attr->form), die->offset.sect_off,
18525 dwarf2_per_objfile->objfile->name);
18526 return build_error_marker_type (cu, die);
18530 /* Load the DIEs associated with type unit PER_CU into memory. */
18533 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
18535 struct signatured_type *sig_type;
18537 /* Caller is responsible for ensuring type_unit_groups don't get here. */
18538 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
18540 /* We have the per_cu, but we need the signatured_type.
18541 Fortunately this is an easy translation. */
18542 gdb_assert (per_cu->is_debug_types);
18543 sig_type = (struct signatured_type *) per_cu;
18545 gdb_assert (per_cu->cu == NULL);
18547 read_signatured_type (sig_type);
18549 gdb_assert (per_cu->cu != NULL);
18552 /* die_reader_func for read_signatured_type.
18553 This is identical to load_full_comp_unit_reader,
18554 but is kept separate for now. */
18557 read_signatured_type_reader (const struct die_reader_specs *reader,
18558 const gdb_byte *info_ptr,
18559 struct die_info *comp_unit_die,
18563 struct dwarf2_cu *cu = reader->cu;
18565 gdb_assert (cu->die_hash == NULL);
18567 htab_create_alloc_ex (cu->header.length / 12,
18571 &cu->comp_unit_obstack,
18572 hashtab_obstack_allocate,
18573 dummy_obstack_deallocate);
18576 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18577 &info_ptr, comp_unit_die);
18578 cu->dies = comp_unit_die;
18579 /* comp_unit_die is not stored in die_hash, no need. */
18581 /* We try not to read any attributes in this function, because not
18582 all CUs needed for references have been loaded yet, and symbol
18583 table processing isn't initialized. But we have to set the CU language,
18584 or we won't be able to build types correctly.
18585 Similarly, if we do not read the producer, we can not apply
18586 producer-specific interpretation. */
18587 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18590 /* Read in a signatured type and build its CU and DIEs.
18591 If the type is a stub for the real type in a DWO file,
18592 read in the real type from the DWO file as well. */
18595 read_signatured_type (struct signatured_type *sig_type)
18597 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18599 gdb_assert (per_cu->is_debug_types);
18600 gdb_assert (per_cu->cu == NULL);
18602 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18603 read_signatured_type_reader, NULL);
18606 /* Decode simple location descriptions.
18607 Given a pointer to a dwarf block that defines a location, compute
18608 the location and return the value.
18610 NOTE drow/2003-11-18: This function is called in two situations
18611 now: for the address of static or global variables (partial symbols
18612 only) and for offsets into structures which are expected to be
18613 (more or less) constant. The partial symbol case should go away,
18614 and only the constant case should remain. That will let this
18615 function complain more accurately. A few special modes are allowed
18616 without complaint for global variables (for instance, global
18617 register values and thread-local values).
18619 A location description containing no operations indicates that the
18620 object is optimized out. The return value is 0 for that case.
18621 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18622 callers will only want a very basic result and this can become a
18625 Note that stack[0] is unused except as a default error return. */
18628 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18630 struct objfile *objfile = cu->objfile;
18632 size_t size = blk->size;
18633 const gdb_byte *data = blk->data;
18634 CORE_ADDR stack[64];
18636 unsigned int bytes_read, unsnd;
18642 stack[++stacki] = 0;
18681 stack[++stacki] = op - DW_OP_lit0;
18716 stack[++stacki] = op - DW_OP_reg0;
18718 dwarf2_complex_location_expr_complaint ();
18722 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18724 stack[++stacki] = unsnd;
18726 dwarf2_complex_location_expr_complaint ();
18730 stack[++stacki] = read_address (objfile->obfd, &data[i],
18735 case DW_OP_const1u:
18736 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18740 case DW_OP_const1s:
18741 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18745 case DW_OP_const2u:
18746 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18750 case DW_OP_const2s:
18751 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18755 case DW_OP_const4u:
18756 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18760 case DW_OP_const4s:
18761 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18765 case DW_OP_const8u:
18766 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18771 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18777 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18782 stack[stacki + 1] = stack[stacki];
18787 stack[stacki - 1] += stack[stacki];
18791 case DW_OP_plus_uconst:
18792 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18798 stack[stacki - 1] -= stack[stacki];
18803 /* If we're not the last op, then we definitely can't encode
18804 this using GDB's address_class enum. This is valid for partial
18805 global symbols, although the variable's address will be bogus
18808 dwarf2_complex_location_expr_complaint ();
18811 case DW_OP_GNU_push_tls_address:
18812 /* The top of the stack has the offset from the beginning
18813 of the thread control block at which the variable is located. */
18814 /* Nothing should follow this operator, so the top of stack would
18816 /* This is valid for partial global symbols, but the variable's
18817 address will be bogus in the psymtab. Make it always at least
18818 non-zero to not look as a variable garbage collected by linker
18819 which have DW_OP_addr 0. */
18821 dwarf2_complex_location_expr_complaint ();
18825 case DW_OP_GNU_uninit:
18828 case DW_OP_GNU_addr_index:
18829 case DW_OP_GNU_const_index:
18830 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18837 const char *name = get_DW_OP_name (op);
18840 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18843 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18847 return (stack[stacki]);
18850 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18851 outside of the allocated space. Also enforce minimum>0. */
18852 if (stacki >= ARRAY_SIZE (stack) - 1)
18854 complaint (&symfile_complaints,
18855 _("location description stack overflow"));
18861 complaint (&symfile_complaints,
18862 _("location description stack underflow"));
18866 return (stack[stacki]);
18869 /* memory allocation interface */
18871 static struct dwarf_block *
18872 dwarf_alloc_block (struct dwarf2_cu *cu)
18874 struct dwarf_block *blk;
18876 blk = (struct dwarf_block *)
18877 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18881 static struct die_info *
18882 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18884 struct die_info *die;
18885 size_t size = sizeof (struct die_info);
18888 size += (num_attrs - 1) * sizeof (struct attribute);
18890 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18891 memset (die, 0, sizeof (struct die_info));
18896 /* Macro support. */
18898 /* Return file name relative to the compilation directory of file number I in
18899 *LH's file name table. The result is allocated using xmalloc; the caller is
18900 responsible for freeing it. */
18903 file_file_name (int file, struct line_header *lh)
18905 /* Is the file number a valid index into the line header's file name
18906 table? Remember that file numbers start with one, not zero. */
18907 if (1 <= file && file <= lh->num_file_names)
18909 struct file_entry *fe = &lh->file_names[file - 1];
18911 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18912 return xstrdup (fe->name);
18913 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18918 /* The compiler produced a bogus file number. We can at least
18919 record the macro definitions made in the file, even if we
18920 won't be able to find the file by name. */
18921 char fake_name[80];
18923 xsnprintf (fake_name, sizeof (fake_name),
18924 "<bad macro file number %d>", file);
18926 complaint (&symfile_complaints,
18927 _("bad file number in macro information (%d)"),
18930 return xstrdup (fake_name);
18934 /* Return the full name of file number I in *LH's file name table.
18935 Use COMP_DIR as the name of the current directory of the
18936 compilation. The result is allocated using xmalloc; the caller is
18937 responsible for freeing it. */
18939 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18941 /* Is the file number a valid index into the line header's file name
18942 table? Remember that file numbers start with one, not zero. */
18943 if (1 <= file && file <= lh->num_file_names)
18945 char *relative = file_file_name (file, lh);
18947 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18949 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18952 return file_file_name (file, lh);
18956 static struct macro_source_file *
18957 macro_start_file (int file, int line,
18958 struct macro_source_file *current_file,
18959 const char *comp_dir,
18960 struct line_header *lh, struct objfile *objfile)
18962 /* File name relative to the compilation directory of this source file. */
18963 char *file_name = file_file_name (file, lh);
18965 /* We don't create a macro table for this compilation unit
18966 at all until we actually get a filename. */
18967 if (! pending_macros)
18968 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18969 objfile->per_bfd->macro_cache,
18972 if (! current_file)
18974 /* If we have no current file, then this must be the start_file
18975 directive for the compilation unit's main source file. */
18976 current_file = macro_set_main (pending_macros, file_name);
18977 macro_define_special (pending_macros);
18980 current_file = macro_include (current_file, line, file_name);
18984 return current_file;
18988 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18989 followed by a null byte. */
18991 copy_string (const char *buf, int len)
18993 char *s = xmalloc (len + 1);
18995 memcpy (s, buf, len);
19001 static const char *
19002 consume_improper_spaces (const char *p, const char *body)
19006 complaint (&symfile_complaints,
19007 _("macro definition contains spaces "
19008 "in formal argument list:\n`%s'"),
19020 parse_macro_definition (struct macro_source_file *file, int line,
19025 /* The body string takes one of two forms. For object-like macro
19026 definitions, it should be:
19028 <macro name> " " <definition>
19030 For function-like macro definitions, it should be:
19032 <macro name> "() " <definition>
19034 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
19036 Spaces may appear only where explicitly indicated, and in the
19039 The Dwarf 2 spec says that an object-like macro's name is always
19040 followed by a space, but versions of GCC around March 2002 omit
19041 the space when the macro's definition is the empty string.
19043 The Dwarf 2 spec says that there should be no spaces between the
19044 formal arguments in a function-like macro's formal argument list,
19045 but versions of GCC around March 2002 include spaces after the
19049 /* Find the extent of the macro name. The macro name is terminated
19050 by either a space or null character (for an object-like macro) or
19051 an opening paren (for a function-like macro). */
19052 for (p = body; *p; p++)
19053 if (*p == ' ' || *p == '(')
19056 if (*p == ' ' || *p == '\0')
19058 /* It's an object-like macro. */
19059 int name_len = p - body;
19060 char *name = copy_string (body, name_len);
19061 const char *replacement;
19064 replacement = body + name_len + 1;
19067 dwarf2_macro_malformed_definition_complaint (body);
19068 replacement = body + name_len;
19071 macro_define_object (file, line, name, replacement);
19075 else if (*p == '(')
19077 /* It's a function-like macro. */
19078 char *name = copy_string (body, p - body);
19081 char **argv = xmalloc (argv_size * sizeof (*argv));
19085 p = consume_improper_spaces (p, body);
19087 /* Parse the formal argument list. */
19088 while (*p && *p != ')')
19090 /* Find the extent of the current argument name. */
19091 const char *arg_start = p;
19093 while (*p && *p != ',' && *p != ')' && *p != ' ')
19096 if (! *p || p == arg_start)
19097 dwarf2_macro_malformed_definition_complaint (body);
19100 /* Make sure argv has room for the new argument. */
19101 if (argc >= argv_size)
19104 argv = xrealloc (argv, argv_size * sizeof (*argv));
19107 argv[argc++] = copy_string (arg_start, p - arg_start);
19110 p = consume_improper_spaces (p, body);
19112 /* Consume the comma, if present. */
19117 p = consume_improper_spaces (p, body);
19126 /* Perfectly formed definition, no complaints. */
19127 macro_define_function (file, line, name,
19128 argc, (const char **) argv,
19130 else if (*p == '\0')
19132 /* Complain, but do define it. */
19133 dwarf2_macro_malformed_definition_complaint (body);
19134 macro_define_function (file, line, name,
19135 argc, (const char **) argv,
19139 /* Just complain. */
19140 dwarf2_macro_malformed_definition_complaint (body);
19143 /* Just complain. */
19144 dwarf2_macro_malformed_definition_complaint (body);
19150 for (i = 0; i < argc; i++)
19156 dwarf2_macro_malformed_definition_complaint (body);
19159 /* Skip some bytes from BYTES according to the form given in FORM.
19160 Returns the new pointer. */
19162 static const gdb_byte *
19163 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
19164 enum dwarf_form form,
19165 unsigned int offset_size,
19166 struct dwarf2_section_info *section)
19168 unsigned int bytes_read;
19172 case DW_FORM_data1:
19177 case DW_FORM_data2:
19181 case DW_FORM_data4:
19185 case DW_FORM_data8:
19189 case DW_FORM_string:
19190 read_direct_string (abfd, bytes, &bytes_read);
19191 bytes += bytes_read;
19194 case DW_FORM_sec_offset:
19196 case DW_FORM_GNU_strp_alt:
19197 bytes += offset_size;
19200 case DW_FORM_block:
19201 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
19202 bytes += bytes_read;
19205 case DW_FORM_block1:
19206 bytes += 1 + read_1_byte (abfd, bytes);
19208 case DW_FORM_block2:
19209 bytes += 2 + read_2_bytes (abfd, bytes);
19211 case DW_FORM_block4:
19212 bytes += 4 + read_4_bytes (abfd, bytes);
19215 case DW_FORM_sdata:
19216 case DW_FORM_udata:
19217 case DW_FORM_GNU_addr_index:
19218 case DW_FORM_GNU_str_index:
19219 bytes = gdb_skip_leb128 (bytes, buffer_end);
19222 dwarf2_section_buffer_overflow_complaint (section);
19230 complaint (&symfile_complaints,
19231 _("invalid form 0x%x in `%s'"),
19233 section->asection->name);
19241 /* A helper for dwarf_decode_macros that handles skipping an unknown
19242 opcode. Returns an updated pointer to the macro data buffer; or,
19243 on error, issues a complaint and returns NULL. */
19245 static const gdb_byte *
19246 skip_unknown_opcode (unsigned int opcode,
19247 const gdb_byte **opcode_definitions,
19248 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19250 unsigned int offset_size,
19251 struct dwarf2_section_info *section)
19253 unsigned int bytes_read, i;
19255 const gdb_byte *defn;
19257 if (opcode_definitions[opcode] == NULL)
19259 complaint (&symfile_complaints,
19260 _("unrecognized DW_MACFINO opcode 0x%x"),
19265 defn = opcode_definitions[opcode];
19266 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
19267 defn += bytes_read;
19269 for (i = 0; i < arg; ++i)
19271 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
19273 if (mac_ptr == NULL)
19275 /* skip_form_bytes already issued the complaint. */
19283 /* A helper function which parses the header of a macro section.
19284 If the macro section is the extended (for now called "GNU") type,
19285 then this updates *OFFSET_SIZE. Returns a pointer to just after
19286 the header, or issues a complaint and returns NULL on error. */
19288 static const gdb_byte *
19289 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
19291 const gdb_byte *mac_ptr,
19292 unsigned int *offset_size,
19293 int section_is_gnu)
19295 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
19297 if (section_is_gnu)
19299 unsigned int version, flags;
19301 version = read_2_bytes (abfd, mac_ptr);
19304 complaint (&symfile_complaints,
19305 _("unrecognized version `%d' in .debug_macro section"),
19311 flags = read_1_byte (abfd, mac_ptr);
19313 *offset_size = (flags & 1) ? 8 : 4;
19315 if ((flags & 2) != 0)
19316 /* We don't need the line table offset. */
19317 mac_ptr += *offset_size;
19319 /* Vendor opcode descriptions. */
19320 if ((flags & 4) != 0)
19322 unsigned int i, count;
19324 count = read_1_byte (abfd, mac_ptr);
19326 for (i = 0; i < count; ++i)
19328 unsigned int opcode, bytes_read;
19331 opcode = read_1_byte (abfd, mac_ptr);
19333 opcode_definitions[opcode] = mac_ptr;
19334 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19335 mac_ptr += bytes_read;
19344 /* A helper for dwarf_decode_macros that handles the GNU extensions,
19345 including DW_MACRO_GNU_transparent_include. */
19348 dwarf_decode_macro_bytes (bfd *abfd,
19349 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19350 struct macro_source_file *current_file,
19351 struct line_header *lh, const char *comp_dir,
19352 struct dwarf2_section_info *section,
19353 int section_is_gnu, int section_is_dwz,
19354 unsigned int offset_size,
19355 struct objfile *objfile,
19356 htab_t include_hash)
19358 enum dwarf_macro_record_type macinfo_type;
19359 int at_commandline;
19360 const gdb_byte *opcode_definitions[256];
19362 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19363 &offset_size, section_is_gnu);
19364 if (mac_ptr == NULL)
19366 /* We already issued a complaint. */
19370 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
19371 GDB is still reading the definitions from command line. First
19372 DW_MACINFO_start_file will need to be ignored as it was already executed
19373 to create CURRENT_FILE for the main source holding also the command line
19374 definitions. On first met DW_MACINFO_start_file this flag is reset to
19375 normally execute all the remaining DW_MACINFO_start_file macinfos. */
19377 at_commandline = 1;
19381 /* Do we at least have room for a macinfo type byte? */
19382 if (mac_ptr >= mac_end)
19384 dwarf2_section_buffer_overflow_complaint (section);
19388 macinfo_type = read_1_byte (abfd, mac_ptr);
19391 /* Note that we rely on the fact that the corresponding GNU and
19392 DWARF constants are the same. */
19393 switch (macinfo_type)
19395 /* A zero macinfo type indicates the end of the macro
19400 case DW_MACRO_GNU_define:
19401 case DW_MACRO_GNU_undef:
19402 case DW_MACRO_GNU_define_indirect:
19403 case DW_MACRO_GNU_undef_indirect:
19404 case DW_MACRO_GNU_define_indirect_alt:
19405 case DW_MACRO_GNU_undef_indirect_alt:
19407 unsigned int bytes_read;
19412 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19413 mac_ptr += bytes_read;
19415 if (macinfo_type == DW_MACRO_GNU_define
19416 || macinfo_type == DW_MACRO_GNU_undef)
19418 body = read_direct_string (abfd, mac_ptr, &bytes_read);
19419 mac_ptr += bytes_read;
19423 LONGEST str_offset;
19425 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
19426 mac_ptr += offset_size;
19428 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
19429 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
19432 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19434 body = read_indirect_string_from_dwz (dwz, str_offset);
19437 body = read_indirect_string_at_offset (abfd, str_offset);
19440 is_define = (macinfo_type == DW_MACRO_GNU_define
19441 || macinfo_type == DW_MACRO_GNU_define_indirect
19442 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
19443 if (! current_file)
19445 /* DWARF violation as no main source is present. */
19446 complaint (&symfile_complaints,
19447 _("debug info with no main source gives macro %s "
19449 is_define ? _("definition") : _("undefinition"),
19453 if ((line == 0 && !at_commandline)
19454 || (line != 0 && at_commandline))
19455 complaint (&symfile_complaints,
19456 _("debug info gives %s macro %s with %s line %d: %s"),
19457 at_commandline ? _("command-line") : _("in-file"),
19458 is_define ? _("definition") : _("undefinition"),
19459 line == 0 ? _("zero") : _("non-zero"), line, body);
19462 parse_macro_definition (current_file, line, body);
19465 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
19466 || macinfo_type == DW_MACRO_GNU_undef_indirect
19467 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
19468 macro_undef (current_file, line, body);
19473 case DW_MACRO_GNU_start_file:
19475 unsigned int bytes_read;
19478 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19479 mac_ptr += bytes_read;
19480 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19481 mac_ptr += bytes_read;
19483 if ((line == 0 && !at_commandline)
19484 || (line != 0 && at_commandline))
19485 complaint (&symfile_complaints,
19486 _("debug info gives source %d included "
19487 "from %s at %s line %d"),
19488 file, at_commandline ? _("command-line") : _("file"),
19489 line == 0 ? _("zero") : _("non-zero"), line);
19491 if (at_commandline)
19493 /* This DW_MACRO_GNU_start_file was executed in the
19495 at_commandline = 0;
19498 current_file = macro_start_file (file, line,
19499 current_file, comp_dir,
19504 case DW_MACRO_GNU_end_file:
19505 if (! current_file)
19506 complaint (&symfile_complaints,
19507 _("macro debug info has an unmatched "
19508 "`close_file' directive"));
19511 current_file = current_file->included_by;
19512 if (! current_file)
19514 enum dwarf_macro_record_type next_type;
19516 /* GCC circa March 2002 doesn't produce the zero
19517 type byte marking the end of the compilation
19518 unit. Complain if it's not there, but exit no
19521 /* Do we at least have room for a macinfo type byte? */
19522 if (mac_ptr >= mac_end)
19524 dwarf2_section_buffer_overflow_complaint (section);
19528 /* We don't increment mac_ptr here, so this is just
19530 next_type = read_1_byte (abfd, mac_ptr);
19531 if (next_type != 0)
19532 complaint (&symfile_complaints,
19533 _("no terminating 0-type entry for "
19534 "macros in `.debug_macinfo' section"));
19541 case DW_MACRO_GNU_transparent_include:
19542 case DW_MACRO_GNU_transparent_include_alt:
19546 bfd *include_bfd = abfd;
19547 struct dwarf2_section_info *include_section = section;
19548 struct dwarf2_section_info alt_section;
19549 const gdb_byte *include_mac_end = mac_end;
19550 int is_dwz = section_is_dwz;
19551 const gdb_byte *new_mac_ptr;
19553 offset = read_offset_1 (abfd, mac_ptr, offset_size);
19554 mac_ptr += offset_size;
19556 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
19558 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19560 dwarf2_read_section (dwarf2_per_objfile->objfile,
19563 include_bfd = dwz->macro.asection->owner;
19564 include_section = &dwz->macro;
19565 include_mac_end = dwz->macro.buffer + dwz->macro.size;
19569 new_mac_ptr = include_section->buffer + offset;
19570 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
19574 /* This has actually happened; see
19575 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
19576 complaint (&symfile_complaints,
19577 _("recursive DW_MACRO_GNU_transparent_include in "
19578 ".debug_macro section"));
19582 *slot = (void *) new_mac_ptr;
19584 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19585 include_mac_end, current_file,
19587 section, section_is_gnu, is_dwz,
19588 offset_size, objfile, include_hash);
19590 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19595 case DW_MACINFO_vendor_ext:
19596 if (!section_is_gnu)
19598 unsigned int bytes_read;
19601 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19602 mac_ptr += bytes_read;
19603 read_direct_string (abfd, mac_ptr, &bytes_read);
19604 mac_ptr += bytes_read;
19606 /* We don't recognize any vendor extensions. */
19612 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19613 mac_ptr, mac_end, abfd, offset_size,
19615 if (mac_ptr == NULL)
19619 } while (macinfo_type != 0);
19623 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19624 const char *comp_dir, int section_is_gnu)
19626 struct objfile *objfile = dwarf2_per_objfile->objfile;
19627 struct line_header *lh = cu->line_header;
19629 const gdb_byte *mac_ptr, *mac_end;
19630 struct macro_source_file *current_file = 0;
19631 enum dwarf_macro_record_type macinfo_type;
19632 unsigned int offset_size = cu->header.offset_size;
19633 const gdb_byte *opcode_definitions[256];
19634 struct cleanup *cleanup;
19635 htab_t include_hash;
19637 struct dwarf2_section_info *section;
19638 const char *section_name;
19640 if (cu->dwo_unit != NULL)
19642 if (section_is_gnu)
19644 section = &cu->dwo_unit->dwo_file->sections.macro;
19645 section_name = ".debug_macro.dwo";
19649 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19650 section_name = ".debug_macinfo.dwo";
19655 if (section_is_gnu)
19657 section = &dwarf2_per_objfile->macro;
19658 section_name = ".debug_macro";
19662 section = &dwarf2_per_objfile->macinfo;
19663 section_name = ".debug_macinfo";
19667 dwarf2_read_section (objfile, section);
19668 if (section->buffer == NULL)
19670 complaint (&symfile_complaints, _("missing %s section"), section_name);
19673 abfd = section->asection->owner;
19675 /* First pass: Find the name of the base filename.
19676 This filename is needed in order to process all macros whose definition
19677 (or undefinition) comes from the command line. These macros are defined
19678 before the first DW_MACINFO_start_file entry, and yet still need to be
19679 associated to the base file.
19681 To determine the base file name, we scan the macro definitions until we
19682 reach the first DW_MACINFO_start_file entry. We then initialize
19683 CURRENT_FILE accordingly so that any macro definition found before the
19684 first DW_MACINFO_start_file can still be associated to the base file. */
19686 mac_ptr = section->buffer + offset;
19687 mac_end = section->buffer + section->size;
19689 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19690 &offset_size, section_is_gnu);
19691 if (mac_ptr == NULL)
19693 /* We already issued a complaint. */
19699 /* Do we at least have room for a macinfo type byte? */
19700 if (mac_ptr >= mac_end)
19702 /* Complaint is printed during the second pass as GDB will probably
19703 stop the first pass earlier upon finding
19704 DW_MACINFO_start_file. */
19708 macinfo_type = read_1_byte (abfd, mac_ptr);
19711 /* Note that we rely on the fact that the corresponding GNU and
19712 DWARF constants are the same. */
19713 switch (macinfo_type)
19715 /* A zero macinfo type indicates the end of the macro
19720 case DW_MACRO_GNU_define:
19721 case DW_MACRO_GNU_undef:
19722 /* Only skip the data by MAC_PTR. */
19724 unsigned int bytes_read;
19726 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19727 mac_ptr += bytes_read;
19728 read_direct_string (abfd, mac_ptr, &bytes_read);
19729 mac_ptr += bytes_read;
19733 case DW_MACRO_GNU_start_file:
19735 unsigned int bytes_read;
19738 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19739 mac_ptr += bytes_read;
19740 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19741 mac_ptr += bytes_read;
19743 current_file = macro_start_file (file, line, current_file,
19744 comp_dir, lh, objfile);
19748 case DW_MACRO_GNU_end_file:
19749 /* No data to skip by MAC_PTR. */
19752 case DW_MACRO_GNU_define_indirect:
19753 case DW_MACRO_GNU_undef_indirect:
19754 case DW_MACRO_GNU_define_indirect_alt:
19755 case DW_MACRO_GNU_undef_indirect_alt:
19757 unsigned int bytes_read;
19759 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19760 mac_ptr += bytes_read;
19761 mac_ptr += offset_size;
19765 case DW_MACRO_GNU_transparent_include:
19766 case DW_MACRO_GNU_transparent_include_alt:
19767 /* Note that, according to the spec, a transparent include
19768 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19769 skip this opcode. */
19770 mac_ptr += offset_size;
19773 case DW_MACINFO_vendor_ext:
19774 /* Only skip the data by MAC_PTR. */
19775 if (!section_is_gnu)
19777 unsigned int bytes_read;
19779 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19780 mac_ptr += bytes_read;
19781 read_direct_string (abfd, mac_ptr, &bytes_read);
19782 mac_ptr += bytes_read;
19787 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19788 mac_ptr, mac_end, abfd, offset_size,
19790 if (mac_ptr == NULL)
19794 } while (macinfo_type != 0 && current_file == NULL);
19796 /* Second pass: Process all entries.
19798 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19799 command-line macro definitions/undefinitions. This flag is unset when we
19800 reach the first DW_MACINFO_start_file entry. */
19802 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19803 NULL, xcalloc, xfree);
19804 cleanup = make_cleanup_htab_delete (include_hash);
19805 mac_ptr = section->buffer + offset;
19806 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19807 *slot = (void *) mac_ptr;
19808 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19809 current_file, lh, comp_dir, section,
19811 offset_size, objfile, include_hash);
19812 do_cleanups (cleanup);
19815 /* Check if the attribute's form is a DW_FORM_block*
19816 if so return true else false. */
19819 attr_form_is_block (struct attribute *attr)
19821 return (attr == NULL ? 0 :
19822 attr->form == DW_FORM_block1
19823 || attr->form == DW_FORM_block2
19824 || attr->form == DW_FORM_block4
19825 || attr->form == DW_FORM_block
19826 || attr->form == DW_FORM_exprloc);
19829 /* Return non-zero if ATTR's value is a section offset --- classes
19830 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19831 You may use DW_UNSND (attr) to retrieve such offsets.
19833 Section 7.5.4, "Attribute Encodings", explains that no attribute
19834 may have a value that belongs to more than one of these classes; it
19835 would be ambiguous if we did, because we use the same forms for all
19839 attr_form_is_section_offset (struct attribute *attr)
19841 return (attr->form == DW_FORM_data4
19842 || attr->form == DW_FORM_data8
19843 || attr->form == DW_FORM_sec_offset);
19846 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19847 zero otherwise. When this function returns true, you can apply
19848 dwarf2_get_attr_constant_value to it.
19850 However, note that for some attributes you must check
19851 attr_form_is_section_offset before using this test. DW_FORM_data4
19852 and DW_FORM_data8 are members of both the constant class, and of
19853 the classes that contain offsets into other debug sections
19854 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19855 that, if an attribute's can be either a constant or one of the
19856 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19857 taken as section offsets, not constants. */
19860 attr_form_is_constant (struct attribute *attr)
19862 switch (attr->form)
19864 case DW_FORM_sdata:
19865 case DW_FORM_udata:
19866 case DW_FORM_data1:
19867 case DW_FORM_data2:
19868 case DW_FORM_data4:
19869 case DW_FORM_data8:
19876 /* Return the .debug_loc section to use for CU.
19877 For DWO files use .debug_loc.dwo. */
19879 static struct dwarf2_section_info *
19880 cu_debug_loc_section (struct dwarf2_cu *cu)
19883 return &cu->dwo_unit->dwo_file->sections.loc;
19884 return &dwarf2_per_objfile->loc;
19887 /* A helper function that fills in a dwarf2_loclist_baton. */
19890 fill_in_loclist_baton (struct dwarf2_cu *cu,
19891 struct dwarf2_loclist_baton *baton,
19892 struct attribute *attr)
19894 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19896 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19898 baton->per_cu = cu->per_cu;
19899 gdb_assert (baton->per_cu);
19900 /* We don't know how long the location list is, but make sure we
19901 don't run off the edge of the section. */
19902 baton->size = section->size - DW_UNSND (attr);
19903 baton->data = section->buffer + DW_UNSND (attr);
19904 baton->base_address = cu->base_address;
19905 baton->from_dwo = cu->dwo_unit != NULL;
19909 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19910 struct dwarf2_cu *cu, int is_block)
19912 struct objfile *objfile = dwarf2_per_objfile->objfile;
19913 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19915 if (attr_form_is_section_offset (attr)
19916 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19917 the section. If so, fall through to the complaint in the
19919 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19921 struct dwarf2_loclist_baton *baton;
19923 baton = obstack_alloc (&objfile->objfile_obstack,
19924 sizeof (struct dwarf2_loclist_baton));
19926 fill_in_loclist_baton (cu, baton, attr);
19928 if (cu->base_known == 0)
19929 complaint (&symfile_complaints,
19930 _("Location list used without "
19931 "specifying the CU base address."));
19933 SYMBOL_ACLASS_INDEX (sym) = (is_block
19934 ? dwarf2_loclist_block_index
19935 : dwarf2_loclist_index);
19936 SYMBOL_LOCATION_BATON (sym) = baton;
19940 struct dwarf2_locexpr_baton *baton;
19942 baton = obstack_alloc (&objfile->objfile_obstack,
19943 sizeof (struct dwarf2_locexpr_baton));
19944 baton->per_cu = cu->per_cu;
19945 gdb_assert (baton->per_cu);
19947 if (attr_form_is_block (attr))
19949 /* Note that we're just copying the block's data pointer
19950 here, not the actual data. We're still pointing into the
19951 info_buffer for SYM's objfile; right now we never release
19952 that buffer, but when we do clean up properly this may
19954 baton->size = DW_BLOCK (attr)->size;
19955 baton->data = DW_BLOCK (attr)->data;
19959 dwarf2_invalid_attrib_class_complaint ("location description",
19960 SYMBOL_NATURAL_NAME (sym));
19964 SYMBOL_ACLASS_INDEX (sym) = (is_block
19965 ? dwarf2_locexpr_block_index
19966 : dwarf2_locexpr_index);
19967 SYMBOL_LOCATION_BATON (sym) = baton;
19971 /* Return the OBJFILE associated with the compilation unit CU. If CU
19972 came from a separate debuginfo file, then the master objfile is
19976 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19978 struct objfile *objfile = per_cu->objfile;
19980 /* Return the master objfile, so that we can report and look up the
19981 correct file containing this variable. */
19982 if (objfile->separate_debug_objfile_backlink)
19983 objfile = objfile->separate_debug_objfile_backlink;
19988 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19989 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19990 CU_HEADERP first. */
19992 static const struct comp_unit_head *
19993 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19994 struct dwarf2_per_cu_data *per_cu)
19996 const gdb_byte *info_ptr;
19999 return &per_cu->cu->header;
20001 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
20003 memset (cu_headerp, 0, sizeof (*cu_headerp));
20004 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
20009 /* Return the address size given in the compilation unit header for CU. */
20012 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
20014 struct comp_unit_head cu_header_local;
20015 const struct comp_unit_head *cu_headerp;
20017 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20019 return cu_headerp->addr_size;
20022 /* Return the offset size given in the compilation unit header for CU. */
20025 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
20027 struct comp_unit_head cu_header_local;
20028 const struct comp_unit_head *cu_headerp;
20030 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20032 return cu_headerp->offset_size;
20035 /* See its dwarf2loc.h declaration. */
20038 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
20040 struct comp_unit_head cu_header_local;
20041 const struct comp_unit_head *cu_headerp;
20043 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20045 if (cu_headerp->version == 2)
20046 return cu_headerp->addr_size;
20048 return cu_headerp->offset_size;
20051 /* Return the text offset of the CU. The returned offset comes from
20052 this CU's objfile. If this objfile came from a separate debuginfo
20053 file, then the offset may be different from the corresponding
20054 offset in the parent objfile. */
20057 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
20059 struct objfile *objfile = per_cu->objfile;
20061 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20064 /* Locate the .debug_info compilation unit from CU's objfile which contains
20065 the DIE at OFFSET. Raises an error on failure. */
20067 static struct dwarf2_per_cu_data *
20068 dwarf2_find_containing_comp_unit (sect_offset offset,
20069 unsigned int offset_in_dwz,
20070 struct objfile *objfile)
20072 struct dwarf2_per_cu_data *this_cu;
20074 const sect_offset *cu_off;
20077 high = dwarf2_per_objfile->n_comp_units - 1;
20080 struct dwarf2_per_cu_data *mid_cu;
20081 int mid = low + (high - low) / 2;
20083 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
20084 cu_off = &mid_cu->offset;
20085 if (mid_cu->is_dwz > offset_in_dwz
20086 || (mid_cu->is_dwz == offset_in_dwz
20087 && cu_off->sect_off >= offset.sect_off))
20092 gdb_assert (low == high);
20093 this_cu = dwarf2_per_objfile->all_comp_units[low];
20094 cu_off = &this_cu->offset;
20095 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
20097 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
20098 error (_("Dwarf Error: could not find partial DIE containing "
20099 "offset 0x%lx [in module %s]"),
20100 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
20102 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
20103 <= offset.sect_off);
20104 return dwarf2_per_objfile->all_comp_units[low-1];
20108 this_cu = dwarf2_per_objfile->all_comp_units[low];
20109 if (low == dwarf2_per_objfile->n_comp_units - 1
20110 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
20111 error (_("invalid dwarf2 offset %u"), offset.sect_off);
20112 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
20117 /* Initialize dwarf2_cu CU, owned by PER_CU. */
20120 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
20122 memset (cu, 0, sizeof (*cu));
20124 cu->per_cu = per_cu;
20125 cu->objfile = per_cu->objfile;
20126 obstack_init (&cu->comp_unit_obstack);
20129 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
20132 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
20133 enum language pretend_language)
20135 struct attribute *attr;
20137 /* Set the language we're debugging. */
20138 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
20140 set_cu_language (DW_UNSND (attr), cu);
20143 cu->language = pretend_language;
20144 cu->language_defn = language_def (cu->language);
20147 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
20149 cu->producer = DW_STRING (attr);
20152 /* Release one cached compilation unit, CU. We unlink it from the tree
20153 of compilation units, but we don't remove it from the read_in_chain;
20154 the caller is responsible for that.
20155 NOTE: DATA is a void * because this function is also used as a
20156 cleanup routine. */
20159 free_heap_comp_unit (void *data)
20161 struct dwarf2_cu *cu = data;
20163 gdb_assert (cu->per_cu != NULL);
20164 cu->per_cu->cu = NULL;
20167 obstack_free (&cu->comp_unit_obstack, NULL);
20172 /* This cleanup function is passed the address of a dwarf2_cu on the stack
20173 when we're finished with it. We can't free the pointer itself, but be
20174 sure to unlink it from the cache. Also release any associated storage. */
20177 free_stack_comp_unit (void *data)
20179 struct dwarf2_cu *cu = data;
20181 gdb_assert (cu->per_cu != NULL);
20182 cu->per_cu->cu = NULL;
20185 obstack_free (&cu->comp_unit_obstack, NULL);
20186 cu->partial_dies = NULL;
20189 /* Free all cached compilation units. */
20192 free_cached_comp_units (void *data)
20194 struct dwarf2_per_cu_data *per_cu, **last_chain;
20196 per_cu = dwarf2_per_objfile->read_in_chain;
20197 last_chain = &dwarf2_per_objfile->read_in_chain;
20198 while (per_cu != NULL)
20200 struct dwarf2_per_cu_data *next_cu;
20202 next_cu = per_cu->cu->read_in_chain;
20204 free_heap_comp_unit (per_cu->cu);
20205 *last_chain = next_cu;
20211 /* Increase the age counter on each cached compilation unit, and free
20212 any that are too old. */
20215 age_cached_comp_units (void)
20217 struct dwarf2_per_cu_data *per_cu, **last_chain;
20219 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
20220 per_cu = dwarf2_per_objfile->read_in_chain;
20221 while (per_cu != NULL)
20223 per_cu->cu->last_used ++;
20224 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
20225 dwarf2_mark (per_cu->cu);
20226 per_cu = per_cu->cu->read_in_chain;
20229 per_cu = dwarf2_per_objfile->read_in_chain;
20230 last_chain = &dwarf2_per_objfile->read_in_chain;
20231 while (per_cu != NULL)
20233 struct dwarf2_per_cu_data *next_cu;
20235 next_cu = per_cu->cu->read_in_chain;
20237 if (!per_cu->cu->mark)
20239 free_heap_comp_unit (per_cu->cu);
20240 *last_chain = next_cu;
20243 last_chain = &per_cu->cu->read_in_chain;
20249 /* Remove a single compilation unit from the cache. */
20252 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
20254 struct dwarf2_per_cu_data *per_cu, **last_chain;
20256 per_cu = dwarf2_per_objfile->read_in_chain;
20257 last_chain = &dwarf2_per_objfile->read_in_chain;
20258 while (per_cu != NULL)
20260 struct dwarf2_per_cu_data *next_cu;
20262 next_cu = per_cu->cu->read_in_chain;
20264 if (per_cu == target_per_cu)
20266 free_heap_comp_unit (per_cu->cu);
20268 *last_chain = next_cu;
20272 last_chain = &per_cu->cu->read_in_chain;
20278 /* Release all extra memory associated with OBJFILE. */
20281 dwarf2_free_objfile (struct objfile *objfile)
20283 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20285 if (dwarf2_per_objfile == NULL)
20288 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
20289 free_cached_comp_units (NULL);
20291 if (dwarf2_per_objfile->quick_file_names_table)
20292 htab_delete (dwarf2_per_objfile->quick_file_names_table);
20294 /* Everything else should be on the objfile obstack. */
20297 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
20298 We store these in a hash table separate from the DIEs, and preserve them
20299 when the DIEs are flushed out of cache.
20301 The CU "per_cu" pointer is needed because offset alone is not enough to
20302 uniquely identify the type. A file may have multiple .debug_types sections,
20303 or the type may come from a DWO file. Furthermore, while it's more logical
20304 to use per_cu->section+offset, with Fission the section with the data is in
20305 the DWO file but we don't know that section at the point we need it.
20306 We have to use something in dwarf2_per_cu_data (or the pointer to it)
20307 because we can enter the lookup routine, get_die_type_at_offset, from
20308 outside this file, and thus won't necessarily have PER_CU->cu.
20309 Fortunately, PER_CU is stable for the life of the objfile. */
20311 struct dwarf2_per_cu_offset_and_type
20313 const struct dwarf2_per_cu_data *per_cu;
20314 sect_offset offset;
20318 /* Hash function for a dwarf2_per_cu_offset_and_type. */
20321 per_cu_offset_and_type_hash (const void *item)
20323 const struct dwarf2_per_cu_offset_and_type *ofs = item;
20325 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
20328 /* Equality function for a dwarf2_per_cu_offset_and_type. */
20331 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
20333 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
20334 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
20336 return (ofs_lhs->per_cu == ofs_rhs->per_cu
20337 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
20340 /* Set the type associated with DIE to TYPE. Save it in CU's hash
20341 table if necessary. For convenience, return TYPE.
20343 The DIEs reading must have careful ordering to:
20344 * Not cause infite loops trying to read in DIEs as a prerequisite for
20345 reading current DIE.
20346 * Not trying to dereference contents of still incompletely read in types
20347 while reading in other DIEs.
20348 * Enable referencing still incompletely read in types just by a pointer to
20349 the type without accessing its fields.
20351 Therefore caller should follow these rules:
20352 * Try to fetch any prerequisite types we may need to build this DIE type
20353 before building the type and calling set_die_type.
20354 * After building type call set_die_type for current DIE as soon as
20355 possible before fetching more types to complete the current type.
20356 * Make the type as complete as possible before fetching more types. */
20358 static struct type *
20359 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20361 struct dwarf2_per_cu_offset_and_type **slot, ofs;
20362 struct objfile *objfile = cu->objfile;
20364 /* For Ada types, make sure that the gnat-specific data is always
20365 initialized (if not already set). There are a few types where
20366 we should not be doing so, because the type-specific area is
20367 already used to hold some other piece of info (eg: TYPE_CODE_FLT
20368 where the type-specific area is used to store the floatformat).
20369 But this is not a problem, because the gnat-specific information
20370 is actually not needed for these types. */
20371 if (need_gnat_info (cu)
20372 && TYPE_CODE (type) != TYPE_CODE_FUNC
20373 && TYPE_CODE (type) != TYPE_CODE_FLT
20374 && !HAVE_GNAT_AUX_INFO (type))
20375 INIT_GNAT_SPECIFIC (type);
20377 if (dwarf2_per_objfile->die_type_hash == NULL)
20379 dwarf2_per_objfile->die_type_hash =
20380 htab_create_alloc_ex (127,
20381 per_cu_offset_and_type_hash,
20382 per_cu_offset_and_type_eq,
20384 &objfile->objfile_obstack,
20385 hashtab_obstack_allocate,
20386 dummy_obstack_deallocate);
20389 ofs.per_cu = cu->per_cu;
20390 ofs.offset = die->offset;
20392 slot = (struct dwarf2_per_cu_offset_and_type **)
20393 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
20395 complaint (&symfile_complaints,
20396 _("A problem internal to GDB: DIE 0x%x has type already set"),
20397 die->offset.sect_off);
20398 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
20403 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
20404 or return NULL if the die does not have a saved type. */
20406 static struct type *
20407 get_die_type_at_offset (sect_offset offset,
20408 struct dwarf2_per_cu_data *per_cu)
20410 struct dwarf2_per_cu_offset_and_type *slot, ofs;
20412 if (dwarf2_per_objfile->die_type_hash == NULL)
20415 ofs.per_cu = per_cu;
20416 ofs.offset = offset;
20417 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
20424 /* Look up the type for DIE in CU in die_type_hash,
20425 or return NULL if DIE does not have a saved type. */
20427 static struct type *
20428 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
20430 return get_die_type_at_offset (die->offset, cu->per_cu);
20433 /* Add a dependence relationship from CU to REF_PER_CU. */
20436 dwarf2_add_dependence (struct dwarf2_cu *cu,
20437 struct dwarf2_per_cu_data *ref_per_cu)
20441 if (cu->dependencies == NULL)
20443 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
20444 NULL, &cu->comp_unit_obstack,
20445 hashtab_obstack_allocate,
20446 dummy_obstack_deallocate);
20448 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
20450 *slot = ref_per_cu;
20453 /* Subroutine of dwarf2_mark to pass to htab_traverse.
20454 Set the mark field in every compilation unit in the
20455 cache that we must keep because we are keeping CU. */
20458 dwarf2_mark_helper (void **slot, void *data)
20460 struct dwarf2_per_cu_data *per_cu;
20462 per_cu = (struct dwarf2_per_cu_data *) *slot;
20464 /* cu->dependencies references may not yet have been ever read if QUIT aborts
20465 reading of the chain. As such dependencies remain valid it is not much
20466 useful to track and undo them during QUIT cleanups. */
20467 if (per_cu->cu == NULL)
20470 if (per_cu->cu->mark)
20472 per_cu->cu->mark = 1;
20474 if (per_cu->cu->dependencies != NULL)
20475 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
20480 /* Set the mark field in CU and in every other compilation unit in the
20481 cache that we must keep because we are keeping CU. */
20484 dwarf2_mark (struct dwarf2_cu *cu)
20489 if (cu->dependencies != NULL)
20490 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
20494 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
20498 per_cu->cu->mark = 0;
20499 per_cu = per_cu->cu->read_in_chain;
20503 /* Trivial hash function for partial_die_info: the hash value of a DIE
20504 is its offset in .debug_info for this objfile. */
20507 partial_die_hash (const void *item)
20509 const struct partial_die_info *part_die = item;
20511 return part_die->offset.sect_off;
20514 /* Trivial comparison function for partial_die_info structures: two DIEs
20515 are equal if they have the same offset. */
20518 partial_die_eq (const void *item_lhs, const void *item_rhs)
20520 const struct partial_die_info *part_die_lhs = item_lhs;
20521 const struct partial_die_info *part_die_rhs = item_rhs;
20523 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
20526 static struct cmd_list_element *set_dwarf2_cmdlist;
20527 static struct cmd_list_element *show_dwarf2_cmdlist;
20530 set_dwarf2_cmd (char *args, int from_tty)
20532 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
20536 show_dwarf2_cmd (char *args, int from_tty)
20538 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
20541 /* Free data associated with OBJFILE, if necessary. */
20544 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
20546 struct dwarf2_per_objfile *data = d;
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);