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 (const struct attribute *, struct symbol *,
1456 struct dwarf2_cu *);
1458 static void dwarf2_const_value_attr (const 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 *, const 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 sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1613 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1615 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1616 const struct attribute *,
1617 struct dwarf2_cu **);
1619 static struct die_info *follow_die_ref (struct die_info *,
1620 const struct attribute *,
1621 struct dwarf2_cu **);
1623 static struct die_info *follow_die_sig (struct die_info *,
1624 const struct attribute *,
1625 struct dwarf2_cu **);
1627 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1628 struct dwarf2_cu *);
1630 static struct type *get_DW_AT_signature_type (struct die_info *,
1631 const struct attribute *,
1632 struct dwarf2_cu *);
1634 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1636 static void read_signatured_type (struct signatured_type *);
1638 static struct type_unit_group *get_type_unit_group
1639 (struct dwarf2_cu *, const struct attribute *);
1641 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1643 /* memory allocation interface */
1645 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1647 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1649 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1652 static int attr_form_is_block (const struct attribute *);
1654 static int attr_form_is_section_offset (const struct attribute *);
1656 static int attr_form_is_constant (const struct attribute *);
1658 static int attr_form_is_ref (const struct attribute *);
1660 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1661 struct dwarf2_loclist_baton *baton,
1662 const struct attribute *attr);
1664 static void dwarf2_symbol_mark_computed (const 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, const 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;
7033 if (per_cu->is_debug_types)
7035 struct signatured_type *sig_type =
7036 (struct signatured_type *) per_cu;
7038 sprintf (buf, "TU %s at offset 0x%x",
7039 hex_string (sig_type->signature), per_cu->offset.sect_off);
7042 sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off);
7044 if (dwarf2_read_debug)
7045 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7047 if (per_cu->is_debug_types)
7048 process_full_type_unit (per_cu, item->pretend_language);
7050 process_full_comp_unit (per_cu, item->pretend_language);
7052 if (dwarf2_read_debug)
7053 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7056 item->per_cu->queued = 0;
7057 next_item = item->next;
7061 dwarf2_queue_tail = NULL;
7063 if (dwarf2_read_debug)
7065 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7066 dwarf2_per_objfile->objfile->name);
7070 /* Free all allocated queue entries. This function only releases anything if
7071 an error was thrown; if the queue was processed then it would have been
7072 freed as we went along. */
7075 dwarf2_release_queue (void *dummy)
7077 struct dwarf2_queue_item *item, *last;
7079 item = dwarf2_queue;
7082 /* Anything still marked queued is likely to be in an
7083 inconsistent state, so discard it. */
7084 if (item->per_cu->queued)
7086 if (item->per_cu->cu != NULL)
7087 free_one_cached_comp_unit (item->per_cu);
7088 item->per_cu->queued = 0;
7096 dwarf2_queue = dwarf2_queue_tail = NULL;
7099 /* Read in full symbols for PST, and anything it depends on. */
7102 psymtab_to_symtab_1 (struct partial_symtab *pst)
7104 struct dwarf2_per_cu_data *per_cu;
7110 for (i = 0; i < pst->number_of_dependencies; i++)
7111 if (!pst->dependencies[i]->readin
7112 && pst->dependencies[i]->user == NULL)
7114 /* Inform about additional files that need to be read in. */
7117 /* FIXME: i18n: Need to make this a single string. */
7118 fputs_filtered (" ", gdb_stdout);
7120 fputs_filtered ("and ", gdb_stdout);
7122 printf_filtered ("%s...", pst->dependencies[i]->filename);
7123 wrap_here (""); /* Flush output. */
7124 gdb_flush (gdb_stdout);
7126 psymtab_to_symtab_1 (pst->dependencies[i]);
7129 per_cu = pst->read_symtab_private;
7133 /* It's an include file, no symbols to read for it.
7134 Everything is in the parent symtab. */
7139 dw2_do_instantiate_symtab (per_cu);
7142 /* Trivial hash function for die_info: the hash value of a DIE
7143 is its offset in .debug_info for this objfile. */
7146 die_hash (const void *item)
7148 const struct die_info *die = item;
7150 return die->offset.sect_off;
7153 /* Trivial comparison function for die_info structures: two DIEs
7154 are equal if they have the same offset. */
7157 die_eq (const void *item_lhs, const void *item_rhs)
7159 const struct die_info *die_lhs = item_lhs;
7160 const struct die_info *die_rhs = item_rhs;
7162 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7165 /* die_reader_func for load_full_comp_unit.
7166 This is identical to read_signatured_type_reader,
7167 but is kept separate for now. */
7170 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7171 const gdb_byte *info_ptr,
7172 struct die_info *comp_unit_die,
7176 struct dwarf2_cu *cu = reader->cu;
7177 enum language *language_ptr = data;
7179 gdb_assert (cu->die_hash == NULL);
7181 htab_create_alloc_ex (cu->header.length / 12,
7185 &cu->comp_unit_obstack,
7186 hashtab_obstack_allocate,
7187 dummy_obstack_deallocate);
7190 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7191 &info_ptr, comp_unit_die);
7192 cu->dies = comp_unit_die;
7193 /* comp_unit_die is not stored in die_hash, no need. */
7195 /* We try not to read any attributes in this function, because not
7196 all CUs needed for references have been loaded yet, and symbol
7197 table processing isn't initialized. But we have to set the CU language,
7198 or we won't be able to build types correctly.
7199 Similarly, if we do not read the producer, we can not apply
7200 producer-specific interpretation. */
7201 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7204 /* Load the DIEs associated with PER_CU into memory. */
7207 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7208 enum language pretend_language)
7210 gdb_assert (! this_cu->is_debug_types);
7212 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7213 load_full_comp_unit_reader, &pretend_language);
7216 /* Add a DIE to the delayed physname list. */
7219 add_to_method_list (struct type *type, int fnfield_index, int index,
7220 const char *name, struct die_info *die,
7221 struct dwarf2_cu *cu)
7223 struct delayed_method_info mi;
7225 mi.fnfield_index = fnfield_index;
7229 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7232 /* A cleanup for freeing the delayed method list. */
7235 free_delayed_list (void *ptr)
7237 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7238 if (cu->method_list != NULL)
7240 VEC_free (delayed_method_info, cu->method_list);
7241 cu->method_list = NULL;
7245 /* Compute the physnames of any methods on the CU's method list.
7247 The computation of method physnames is delayed in order to avoid the
7248 (bad) condition that one of the method's formal parameters is of an as yet
7252 compute_delayed_physnames (struct dwarf2_cu *cu)
7255 struct delayed_method_info *mi;
7256 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7258 const char *physname;
7259 struct fn_fieldlist *fn_flp
7260 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7261 physname = dwarf2_physname (mi->name, mi->die, cu);
7262 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7266 /* Go objects should be embedded in a DW_TAG_module DIE,
7267 and it's not clear if/how imported objects will appear.
7268 To keep Go support simple until that's worked out,
7269 go back through what we've read and create something usable.
7270 We could do this while processing each DIE, and feels kinda cleaner,
7271 but that way is more invasive.
7272 This is to, for example, allow the user to type "p var" or "b main"
7273 without having to specify the package name, and allow lookups
7274 of module.object to work in contexts that use the expression
7278 fixup_go_packaging (struct dwarf2_cu *cu)
7280 char *package_name = NULL;
7281 struct pending *list;
7284 for (list = global_symbols; list != NULL; list = list->next)
7286 for (i = 0; i < list->nsyms; ++i)
7288 struct symbol *sym = list->symbol[i];
7290 if (SYMBOL_LANGUAGE (sym) == language_go
7291 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7293 char *this_package_name = go_symbol_package_name (sym);
7295 if (this_package_name == NULL)
7297 if (package_name == NULL)
7298 package_name = this_package_name;
7301 if (strcmp (package_name, this_package_name) != 0)
7302 complaint (&symfile_complaints,
7303 _("Symtab %s has objects from two different Go packages: %s and %s"),
7304 (SYMBOL_SYMTAB (sym)
7305 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7306 : cu->objfile->name),
7307 this_package_name, package_name);
7308 xfree (this_package_name);
7314 if (package_name != NULL)
7316 struct objfile *objfile = cu->objfile;
7317 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7319 strlen (package_name));
7320 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7321 saved_package_name, objfile);
7324 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7326 sym = allocate_symbol (objfile);
7327 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7328 SYMBOL_SET_NAMES (sym, saved_package_name,
7329 strlen (saved_package_name), 0, objfile);
7330 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7331 e.g., "main" finds the "main" module and not C's main(). */
7332 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7333 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7334 SYMBOL_TYPE (sym) = type;
7336 add_symbol_to_list (sym, &global_symbols);
7338 xfree (package_name);
7342 /* Return the symtab for PER_CU. This works properly regardless of
7343 whether we're using the index or psymtabs. */
7345 static struct symtab *
7346 get_symtab (struct dwarf2_per_cu_data *per_cu)
7348 return (dwarf2_per_objfile->using_index
7349 ? per_cu->v.quick->symtab
7350 : per_cu->v.psymtab->symtab);
7353 /* A helper function for computing the list of all symbol tables
7354 included by PER_CU. */
7357 recursively_compute_inclusions (VEC (symtab_ptr) **result,
7358 htab_t all_children, htab_t all_type_symtabs,
7359 struct dwarf2_per_cu_data *per_cu)
7363 struct symtab *symtab;
7364 struct dwarf2_per_cu_data *iter;
7366 slot = htab_find_slot (all_children, per_cu, INSERT);
7369 /* This inclusion and its children have been processed. */
7374 /* Only add a CU if it has a symbol table. */
7375 symtab = get_symtab (per_cu);
7378 /* If this is a type unit only add its symbol table if we haven't
7379 seen it yet (type unit per_cu's can share symtabs). */
7380 if (per_cu->is_debug_types)
7382 slot = htab_find_slot (all_type_symtabs, symtab, INSERT);
7386 VEC_safe_push (symtab_ptr, *result, symtab);
7390 VEC_safe_push (symtab_ptr, *result, symtab);
7394 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7397 recursively_compute_inclusions (result, all_children,
7398 all_type_symtabs, iter);
7402 /* Compute the symtab 'includes' fields for the symtab related to
7406 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7408 gdb_assert (! per_cu->is_debug_types);
7410 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7413 struct dwarf2_per_cu_data *per_cu_iter;
7414 struct symtab *symtab_iter;
7415 VEC (symtab_ptr) *result_symtabs = NULL;
7416 htab_t all_children, all_type_symtabs;
7417 struct symtab *symtab = get_symtab (per_cu);
7419 /* If we don't have a symtab, we can just skip this case. */
7423 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7424 NULL, xcalloc, xfree);
7425 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7426 NULL, xcalloc, xfree);
7429 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7433 recursively_compute_inclusions (&result_symtabs, all_children,
7434 all_type_symtabs, per_cu_iter);
7437 /* Now we have a transitive closure of all the included symtabs. */
7438 len = VEC_length (symtab_ptr, result_symtabs);
7440 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7441 (len + 1) * sizeof (struct symtab *));
7443 VEC_iterate (symtab_ptr, result_symtabs, ix, symtab_iter);
7445 symtab->includes[ix] = symtab_iter;
7446 symtab->includes[len] = NULL;
7448 VEC_free (symtab_ptr, result_symtabs);
7449 htab_delete (all_children);
7450 htab_delete (all_type_symtabs);
7454 /* Compute the 'includes' field for the symtabs of all the CUs we just
7458 process_cu_includes (void)
7461 struct dwarf2_per_cu_data *iter;
7464 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7468 if (! iter->is_debug_types)
7469 compute_symtab_includes (iter);
7472 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7475 /* Generate full symbol information for PER_CU, whose DIEs have
7476 already been loaded into memory. */
7479 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7480 enum language pretend_language)
7482 struct dwarf2_cu *cu = per_cu->cu;
7483 struct objfile *objfile = per_cu->objfile;
7484 CORE_ADDR lowpc, highpc;
7485 struct symtab *symtab;
7486 struct cleanup *back_to, *delayed_list_cleanup;
7488 struct block *static_block;
7490 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7493 back_to = make_cleanup (really_free_pendings, NULL);
7494 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7496 cu->list_in_scope = &file_symbols;
7498 cu->language = pretend_language;
7499 cu->language_defn = language_def (cu->language);
7501 /* Do line number decoding in read_file_scope () */
7502 process_die (cu->dies, cu);
7504 /* For now fudge the Go package. */
7505 if (cu->language == language_go)
7506 fixup_go_packaging (cu);
7508 /* Now that we have processed all the DIEs in the CU, all the types
7509 should be complete, and it should now be safe to compute all of the
7511 compute_delayed_physnames (cu);
7512 do_cleanups (delayed_list_cleanup);
7514 /* Some compilers don't define a DW_AT_high_pc attribute for the
7515 compilation unit. If the DW_AT_high_pc is missing, synthesize
7516 it, by scanning the DIE's below the compilation unit. */
7517 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7520 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7522 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7523 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7524 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7525 addrmap to help ensure it has an accurate map of pc values belonging to
7527 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7529 symtab = end_symtab_from_static_block (static_block, objfile,
7530 SECT_OFF_TEXT (objfile), 0);
7534 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7536 /* Set symtab language to language from DW_AT_language. If the
7537 compilation is from a C file generated by language preprocessors, do
7538 not set the language if it was already deduced by start_subfile. */
7539 if (!(cu->language == language_c && symtab->language != language_c))
7540 symtab->language = cu->language;
7542 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7543 produce DW_AT_location with location lists but it can be possibly
7544 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7545 there were bugs in prologue debug info, fixed later in GCC-4.5
7546 by "unwind info for epilogues" patch (which is not directly related).
7548 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7549 needed, it would be wrong due to missing DW_AT_producer there.
7551 Still one can confuse GDB by using non-standard GCC compilation
7552 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7554 if (cu->has_loclist && gcc_4_minor >= 5)
7555 symtab->locations_valid = 1;
7557 if (gcc_4_minor >= 5)
7558 symtab->epilogue_unwind_valid = 1;
7560 symtab->call_site_htab = cu->call_site_htab;
7563 if (dwarf2_per_objfile->using_index)
7564 per_cu->v.quick->symtab = symtab;
7567 struct partial_symtab *pst = per_cu->v.psymtab;
7568 pst->symtab = symtab;
7572 /* Push it for inclusion processing later. */
7573 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7575 do_cleanups (back_to);
7578 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7579 already been loaded into memory. */
7582 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7583 enum language pretend_language)
7585 struct dwarf2_cu *cu = per_cu->cu;
7586 struct objfile *objfile = per_cu->objfile;
7587 struct symtab *symtab;
7588 struct cleanup *back_to, *delayed_list_cleanup;
7589 struct signatured_type *sig_type;
7591 gdb_assert (per_cu->is_debug_types);
7592 sig_type = (struct signatured_type *) per_cu;
7595 back_to = make_cleanup (really_free_pendings, NULL);
7596 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7598 cu->list_in_scope = &file_symbols;
7600 cu->language = pretend_language;
7601 cu->language_defn = language_def (cu->language);
7603 /* The symbol tables are set up in read_type_unit_scope. */
7604 process_die (cu->dies, cu);
7606 /* For now fudge the Go package. */
7607 if (cu->language == language_go)
7608 fixup_go_packaging (cu);
7610 /* Now that we have processed all the DIEs in the CU, all the types
7611 should be complete, and it should now be safe to compute all of the
7613 compute_delayed_physnames (cu);
7614 do_cleanups (delayed_list_cleanup);
7616 /* TUs share symbol tables.
7617 If this is the first TU to use this symtab, complete the construction
7618 of it with end_expandable_symtab. Otherwise, complete the addition of
7619 this TU's symbols to the existing symtab. */
7620 if (sig_type->type_unit_group->primary_symtab == NULL)
7622 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7623 sig_type->type_unit_group->primary_symtab = symtab;
7627 /* Set symtab language to language from DW_AT_language. If the
7628 compilation is from a C file generated by language preprocessors,
7629 do not set the language if it was already deduced by
7631 if (!(cu->language == language_c && symtab->language != language_c))
7632 symtab->language = cu->language;
7637 augment_type_symtab (objfile,
7638 sig_type->type_unit_group->primary_symtab);
7639 symtab = sig_type->type_unit_group->primary_symtab;
7642 if (dwarf2_per_objfile->using_index)
7643 per_cu->v.quick->symtab = symtab;
7646 struct partial_symtab *pst = per_cu->v.psymtab;
7647 pst->symtab = symtab;
7651 do_cleanups (back_to);
7654 /* Process an imported unit DIE. */
7657 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7659 struct attribute *attr;
7661 /* For now we don't handle imported units in type units. */
7662 if (cu->per_cu->is_debug_types)
7664 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7665 " supported in type units [in module %s]"),
7669 attr = dwarf2_attr (die, DW_AT_import, cu);
7672 struct dwarf2_per_cu_data *per_cu;
7673 struct symtab *imported_symtab;
7677 offset = dwarf2_get_ref_die_offset (attr);
7678 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7679 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7681 /* Queue the unit, if needed. */
7682 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7683 load_full_comp_unit (per_cu, cu->language);
7685 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7690 /* Process a die and its children. */
7693 process_die (struct die_info *die, struct dwarf2_cu *cu)
7697 case DW_TAG_padding:
7699 case DW_TAG_compile_unit:
7700 case DW_TAG_partial_unit:
7701 read_file_scope (die, cu);
7703 case DW_TAG_type_unit:
7704 read_type_unit_scope (die, cu);
7706 case DW_TAG_subprogram:
7707 case DW_TAG_inlined_subroutine:
7708 read_func_scope (die, cu);
7710 case DW_TAG_lexical_block:
7711 case DW_TAG_try_block:
7712 case DW_TAG_catch_block:
7713 read_lexical_block_scope (die, cu);
7715 case DW_TAG_GNU_call_site:
7716 read_call_site_scope (die, cu);
7718 case DW_TAG_class_type:
7719 case DW_TAG_interface_type:
7720 case DW_TAG_structure_type:
7721 case DW_TAG_union_type:
7722 process_structure_scope (die, cu);
7724 case DW_TAG_enumeration_type:
7725 process_enumeration_scope (die, cu);
7728 /* These dies have a type, but processing them does not create
7729 a symbol or recurse to process the children. Therefore we can
7730 read them on-demand through read_type_die. */
7731 case DW_TAG_subroutine_type:
7732 case DW_TAG_set_type:
7733 case DW_TAG_array_type:
7734 case DW_TAG_pointer_type:
7735 case DW_TAG_ptr_to_member_type:
7736 case DW_TAG_reference_type:
7737 case DW_TAG_string_type:
7740 case DW_TAG_base_type:
7741 case DW_TAG_subrange_type:
7742 case DW_TAG_typedef:
7743 /* Add a typedef symbol for the type definition, if it has a
7745 new_symbol (die, read_type_die (die, cu), cu);
7747 case DW_TAG_common_block:
7748 read_common_block (die, cu);
7750 case DW_TAG_common_inclusion:
7752 case DW_TAG_namespace:
7753 cu->processing_has_namespace_info = 1;
7754 read_namespace (die, cu);
7757 cu->processing_has_namespace_info = 1;
7758 read_module (die, cu);
7760 case DW_TAG_imported_declaration:
7761 case DW_TAG_imported_module:
7762 cu->processing_has_namespace_info = 1;
7763 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7764 || cu->language != language_fortran))
7765 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7766 dwarf_tag_name (die->tag));
7767 read_import_statement (die, cu);
7770 case DW_TAG_imported_unit:
7771 process_imported_unit_die (die, cu);
7775 new_symbol (die, NULL, cu);
7780 /* DWARF name computation. */
7782 /* A helper function for dwarf2_compute_name which determines whether DIE
7783 needs to have the name of the scope prepended to the name listed in the
7787 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7789 struct attribute *attr;
7793 case DW_TAG_namespace:
7794 case DW_TAG_typedef:
7795 case DW_TAG_class_type:
7796 case DW_TAG_interface_type:
7797 case DW_TAG_structure_type:
7798 case DW_TAG_union_type:
7799 case DW_TAG_enumeration_type:
7800 case DW_TAG_enumerator:
7801 case DW_TAG_subprogram:
7805 case DW_TAG_variable:
7806 case DW_TAG_constant:
7807 /* We only need to prefix "globally" visible variables. These include
7808 any variable marked with DW_AT_external or any variable that
7809 lives in a namespace. [Variables in anonymous namespaces
7810 require prefixing, but they are not DW_AT_external.] */
7812 if (dwarf2_attr (die, DW_AT_specification, cu))
7814 struct dwarf2_cu *spec_cu = cu;
7816 return die_needs_namespace (die_specification (die, &spec_cu),
7820 attr = dwarf2_attr (die, DW_AT_external, cu);
7821 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7822 && die->parent->tag != DW_TAG_module)
7824 /* A variable in a lexical block of some kind does not need a
7825 namespace, even though in C++ such variables may be external
7826 and have a mangled name. */
7827 if (die->parent->tag == DW_TAG_lexical_block
7828 || die->parent->tag == DW_TAG_try_block
7829 || die->parent->tag == DW_TAG_catch_block
7830 || die->parent->tag == DW_TAG_subprogram)
7839 /* Retrieve the last character from a mem_file. */
7842 do_ui_file_peek_last (void *object, const char *buffer, long length)
7844 char *last_char_p = (char *) object;
7847 *last_char_p = buffer[length - 1];
7850 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7851 compute the physname for the object, which include a method's:
7852 - formal parameters (C++/Java),
7853 - receiver type (Go),
7854 - return type (Java).
7856 The term "physname" is a bit confusing.
7857 For C++, for example, it is the demangled name.
7858 For Go, for example, it's the mangled name.
7860 For Ada, return the DIE's linkage name rather than the fully qualified
7861 name. PHYSNAME is ignored..
7863 The result is allocated on the objfile_obstack and canonicalized. */
7866 dwarf2_compute_name (const char *name,
7867 struct die_info *die, struct dwarf2_cu *cu,
7870 struct objfile *objfile = cu->objfile;
7873 name = dwarf2_name (die, cu);
7875 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7876 compute it by typename_concat inside GDB. */
7877 if (cu->language == language_ada
7878 || (cu->language == language_fortran && physname))
7880 /* For Ada unit, we prefer the linkage name over the name, as
7881 the former contains the exported name, which the user expects
7882 to be able to reference. Ideally, we want the user to be able
7883 to reference this entity using either natural or linkage name,
7884 but we haven't started looking at this enhancement yet. */
7885 struct attribute *attr;
7887 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7889 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7890 if (attr && DW_STRING (attr))
7891 return DW_STRING (attr);
7894 /* These are the only languages we know how to qualify names in. */
7896 && (cu->language == language_cplus || cu->language == language_java
7897 || cu->language == language_fortran))
7899 if (die_needs_namespace (die, cu))
7903 struct ui_file *buf;
7905 prefix = determine_prefix (die, cu);
7906 buf = mem_fileopen ();
7907 if (*prefix != '\0')
7909 char *prefixed_name = typename_concat (NULL, prefix, name,
7912 fputs_unfiltered (prefixed_name, buf);
7913 xfree (prefixed_name);
7916 fputs_unfiltered (name, buf);
7918 /* Template parameters may be specified in the DIE's DW_AT_name, or
7919 as children with DW_TAG_template_type_param or
7920 DW_TAG_value_type_param. If the latter, add them to the name
7921 here. If the name already has template parameters, then
7922 skip this step; some versions of GCC emit both, and
7923 it is more efficient to use the pre-computed name.
7925 Something to keep in mind about this process: it is very
7926 unlikely, or in some cases downright impossible, to produce
7927 something that will match the mangled name of a function.
7928 If the definition of the function has the same debug info,
7929 we should be able to match up with it anyway. But fallbacks
7930 using the minimal symbol, for instance to find a method
7931 implemented in a stripped copy of libstdc++, will not work.
7932 If we do not have debug info for the definition, we will have to
7933 match them up some other way.
7935 When we do name matching there is a related problem with function
7936 templates; two instantiated function templates are allowed to
7937 differ only by their return types, which we do not add here. */
7939 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7941 struct attribute *attr;
7942 struct die_info *child;
7945 die->building_fullname = 1;
7947 for (child = die->child; child != NULL; child = child->sibling)
7951 const gdb_byte *bytes;
7952 struct dwarf2_locexpr_baton *baton;
7955 if (child->tag != DW_TAG_template_type_param
7956 && child->tag != DW_TAG_template_value_param)
7961 fputs_unfiltered ("<", buf);
7965 fputs_unfiltered (", ", buf);
7967 attr = dwarf2_attr (child, DW_AT_type, cu);
7970 complaint (&symfile_complaints,
7971 _("template parameter missing DW_AT_type"));
7972 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7975 type = die_type (child, cu);
7977 if (child->tag == DW_TAG_template_type_param)
7979 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7983 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7986 complaint (&symfile_complaints,
7987 _("template parameter missing "
7988 "DW_AT_const_value"));
7989 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7993 dwarf2_const_value_attr (attr, type, name,
7994 &cu->comp_unit_obstack, cu,
7995 &value, &bytes, &baton);
7997 if (TYPE_NOSIGN (type))
7998 /* GDB prints characters as NUMBER 'CHAR'. If that's
7999 changed, this can use value_print instead. */
8000 c_printchar (value, type, buf);
8003 struct value_print_options opts;
8006 v = dwarf2_evaluate_loc_desc (type, NULL,
8010 else if (bytes != NULL)
8012 v = allocate_value (type);
8013 memcpy (value_contents_writeable (v), bytes,
8014 TYPE_LENGTH (type));
8017 v = value_from_longest (type, value);
8019 /* Specify decimal so that we do not depend on
8021 get_formatted_print_options (&opts, 'd');
8023 value_print (v, buf, &opts);
8029 die->building_fullname = 0;
8033 /* Close the argument list, with a space if necessary
8034 (nested templates). */
8035 char last_char = '\0';
8036 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8037 if (last_char == '>')
8038 fputs_unfiltered (" >", buf);
8040 fputs_unfiltered (">", buf);
8044 /* For Java and C++ methods, append formal parameter type
8045 information, if PHYSNAME. */
8047 if (physname && die->tag == DW_TAG_subprogram
8048 && (cu->language == language_cplus
8049 || cu->language == language_java))
8051 struct type *type = read_type_die (die, cu);
8053 c_type_print_args (type, buf, 1, cu->language,
8054 &type_print_raw_options);
8056 if (cu->language == language_java)
8058 /* For java, we must append the return type to method
8060 if (die->tag == DW_TAG_subprogram)
8061 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8062 0, 0, &type_print_raw_options);
8064 else if (cu->language == language_cplus)
8066 /* Assume that an artificial first parameter is
8067 "this", but do not crash if it is not. RealView
8068 marks unnamed (and thus unused) parameters as
8069 artificial; there is no way to differentiate
8071 if (TYPE_NFIELDS (type) > 0
8072 && TYPE_FIELD_ARTIFICIAL (type, 0)
8073 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8074 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8076 fputs_unfiltered (" const", buf);
8080 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8082 ui_file_delete (buf);
8084 if (cu->language == language_cplus)
8087 = dwarf2_canonicalize_name (name, cu,
8088 &objfile->objfile_obstack);
8099 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8100 If scope qualifiers are appropriate they will be added. The result
8101 will be allocated on the objfile_obstack, or NULL if the DIE does
8102 not have a name. NAME may either be from a previous call to
8103 dwarf2_name or NULL.
8105 The output string will be canonicalized (if C++/Java). */
8108 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8110 return dwarf2_compute_name (name, die, cu, 0);
8113 /* Construct a physname for the given DIE in CU. NAME may either be
8114 from a previous call to dwarf2_name or NULL. The result will be
8115 allocated on the objfile_objstack or NULL if the DIE does not have a
8118 The output string will be canonicalized (if C++/Java). */
8121 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8123 struct objfile *objfile = cu->objfile;
8124 struct attribute *attr;
8125 const char *retval, *mangled = NULL, *canon = NULL;
8126 struct cleanup *back_to;
8129 /* In this case dwarf2_compute_name is just a shortcut not building anything
8131 if (!die_needs_namespace (die, cu))
8132 return dwarf2_compute_name (name, die, cu, 1);
8134 back_to = make_cleanup (null_cleanup, NULL);
8136 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8138 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8140 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8142 if (attr && DW_STRING (attr))
8146 mangled = DW_STRING (attr);
8148 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8149 type. It is easier for GDB users to search for such functions as
8150 `name(params)' than `long name(params)'. In such case the minimal
8151 symbol names do not match the full symbol names but for template
8152 functions there is never a need to look up their definition from their
8153 declaration so the only disadvantage remains the minimal symbol
8154 variant `long name(params)' does not have the proper inferior type.
8157 if (cu->language == language_go)
8159 /* This is a lie, but we already lie to the caller new_symbol_full.
8160 new_symbol_full assumes we return the mangled name.
8161 This just undoes that lie until things are cleaned up. */
8166 demangled = gdb_demangle (mangled,
8167 (DMGL_PARAMS | DMGL_ANSI
8168 | (cu->language == language_java
8169 ? DMGL_JAVA | DMGL_RET_POSTFIX
8174 make_cleanup (xfree, demangled);
8184 if (canon == NULL || check_physname)
8186 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8188 if (canon != NULL && strcmp (physname, canon) != 0)
8190 /* It may not mean a bug in GDB. The compiler could also
8191 compute DW_AT_linkage_name incorrectly. But in such case
8192 GDB would need to be bug-to-bug compatible. */
8194 complaint (&symfile_complaints,
8195 _("Computed physname <%s> does not match demangled <%s> "
8196 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8197 physname, canon, mangled, die->offset.sect_off, objfile->name);
8199 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8200 is available here - over computed PHYSNAME. It is safer
8201 against both buggy GDB and buggy compilers. */
8215 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8217 do_cleanups (back_to);
8221 /* Read the import statement specified by the given die and record it. */
8224 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8226 struct objfile *objfile = cu->objfile;
8227 struct attribute *import_attr;
8228 struct die_info *imported_die, *child_die;
8229 struct dwarf2_cu *imported_cu;
8230 const char *imported_name;
8231 const char *imported_name_prefix;
8232 const char *canonical_name;
8233 const char *import_alias;
8234 const char *imported_declaration = NULL;
8235 const char *import_prefix;
8236 VEC (const_char_ptr) *excludes = NULL;
8237 struct cleanup *cleanups;
8239 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8240 if (import_attr == NULL)
8242 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8243 dwarf_tag_name (die->tag));
8248 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8249 imported_name = dwarf2_name (imported_die, imported_cu);
8250 if (imported_name == NULL)
8252 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8254 The import in the following code:
8268 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8269 <52> DW_AT_decl_file : 1
8270 <53> DW_AT_decl_line : 6
8271 <54> DW_AT_import : <0x75>
8272 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8274 <5b> DW_AT_decl_file : 1
8275 <5c> DW_AT_decl_line : 2
8276 <5d> DW_AT_type : <0x6e>
8278 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8279 <76> DW_AT_byte_size : 4
8280 <77> DW_AT_encoding : 5 (signed)
8282 imports the wrong die ( 0x75 instead of 0x58 ).
8283 This case will be ignored until the gcc bug is fixed. */
8287 /* Figure out the local name after import. */
8288 import_alias = dwarf2_name (die, cu);
8290 /* Figure out where the statement is being imported to. */
8291 import_prefix = determine_prefix (die, cu);
8293 /* Figure out what the scope of the imported die is and prepend it
8294 to the name of the imported die. */
8295 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8297 if (imported_die->tag != DW_TAG_namespace
8298 && imported_die->tag != DW_TAG_module)
8300 imported_declaration = imported_name;
8301 canonical_name = imported_name_prefix;
8303 else if (strlen (imported_name_prefix) > 0)
8304 canonical_name = obconcat (&objfile->objfile_obstack,
8305 imported_name_prefix, "::", imported_name,
8308 canonical_name = imported_name;
8310 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8312 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8313 for (child_die = die->child; child_die && child_die->tag;
8314 child_die = sibling_die (child_die))
8316 /* DWARF-4: A Fortran use statement with a “rename list” may be
8317 represented by an imported module entry with an import attribute
8318 referring to the module and owned entries corresponding to those
8319 entities that are renamed as part of being imported. */
8321 if (child_die->tag != DW_TAG_imported_declaration)
8323 complaint (&symfile_complaints,
8324 _("child DW_TAG_imported_declaration expected "
8325 "- DIE at 0x%x [in module %s]"),
8326 child_die->offset.sect_off, objfile->name);
8330 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8331 if (import_attr == NULL)
8333 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8334 dwarf_tag_name (child_die->tag));
8339 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8341 imported_name = dwarf2_name (imported_die, imported_cu);
8342 if (imported_name == NULL)
8344 complaint (&symfile_complaints,
8345 _("child DW_TAG_imported_declaration has unknown "
8346 "imported name - DIE at 0x%x [in module %s]"),
8347 child_die->offset.sect_off, objfile->name);
8351 VEC_safe_push (const_char_ptr, excludes, imported_name);
8353 process_die (child_die, cu);
8356 cp_add_using_directive (import_prefix,
8359 imported_declaration,
8362 &objfile->objfile_obstack);
8364 do_cleanups (cleanups);
8367 /* Cleanup function for handle_DW_AT_stmt_list. */
8370 free_cu_line_header (void *arg)
8372 struct dwarf2_cu *cu = arg;
8374 free_line_header (cu->line_header);
8375 cu->line_header = NULL;
8378 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8379 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8380 this, it was first present in GCC release 4.3.0. */
8383 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8385 if (!cu->checked_producer)
8386 check_producer (cu);
8388 return cu->producer_is_gcc_lt_4_3;
8392 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8393 const char **name, const char **comp_dir)
8395 struct attribute *attr;
8400 /* Find the filename. Do not use dwarf2_name here, since the filename
8401 is not a source language identifier. */
8402 attr = dwarf2_attr (die, DW_AT_name, cu);
8405 *name = DW_STRING (attr);
8408 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8410 *comp_dir = DW_STRING (attr);
8411 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8412 && IS_ABSOLUTE_PATH (*name))
8414 char *d = ldirname (*name);
8418 make_cleanup (xfree, d);
8420 if (*comp_dir != NULL)
8422 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8423 directory, get rid of it. */
8424 char *cp = strchr (*comp_dir, ':');
8426 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8431 *name = "<unknown>";
8434 /* Handle DW_AT_stmt_list for a compilation unit.
8435 DIE is the DW_TAG_compile_unit die for CU.
8436 COMP_DIR is the compilation directory.
8437 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8440 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8441 const char *comp_dir) /* ARI: editCase function */
8443 struct attribute *attr;
8445 gdb_assert (! cu->per_cu->is_debug_types);
8447 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8450 unsigned int line_offset = DW_UNSND (attr);
8451 struct line_header *line_header
8452 = dwarf_decode_line_header (line_offset, cu);
8456 cu->line_header = line_header;
8457 make_cleanup (free_cu_line_header, cu);
8458 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8463 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8466 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8468 struct objfile *objfile = dwarf2_per_objfile->objfile;
8469 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8470 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8471 CORE_ADDR highpc = ((CORE_ADDR) 0);
8472 struct attribute *attr;
8473 const char *name = NULL;
8474 const char *comp_dir = NULL;
8475 struct die_info *child_die;
8476 bfd *abfd = objfile->obfd;
8479 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8481 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8483 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8484 from finish_block. */
8485 if (lowpc == ((CORE_ADDR) -1))
8490 find_file_and_directory (die, cu, &name, &comp_dir);
8492 prepare_one_comp_unit (cu, die, cu->language);
8494 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8495 standardised yet. As a workaround for the language detection we fall
8496 back to the DW_AT_producer string. */
8497 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8498 cu->language = language_opencl;
8500 /* Similar hack for Go. */
8501 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8502 set_cu_language (DW_LANG_Go, cu);
8504 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8506 /* Decode line number information if present. We do this before
8507 processing child DIEs, so that the line header table is available
8508 for DW_AT_decl_file. */
8509 handle_DW_AT_stmt_list (die, cu, comp_dir);
8511 /* Process all dies in compilation unit. */
8512 if (die->child != NULL)
8514 child_die = die->child;
8515 while (child_die && child_die->tag)
8517 process_die (child_die, cu);
8518 child_die = sibling_die (child_die);
8522 /* Decode macro information, if present. Dwarf 2 macro information
8523 refers to information in the line number info statement program
8524 header, so we can only read it if we've read the header
8526 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8527 if (attr && cu->line_header)
8529 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8530 complaint (&symfile_complaints,
8531 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8533 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8537 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8538 if (attr && cu->line_header)
8540 unsigned int macro_offset = DW_UNSND (attr);
8542 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8546 do_cleanups (back_to);
8549 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8550 Create the set of symtabs used by this TU, or if this TU is sharing
8551 symtabs with another TU and the symtabs have already been created
8552 then restore those symtabs in the line header.
8553 We don't need the pc/line-number mapping for type units. */
8556 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8558 struct objfile *objfile = dwarf2_per_objfile->objfile;
8559 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8560 struct type_unit_group *tu_group;
8562 struct line_header *lh;
8563 struct attribute *attr;
8564 unsigned int i, line_offset;
8565 struct signatured_type *sig_type;
8567 gdb_assert (per_cu->is_debug_types);
8568 sig_type = (struct signatured_type *) per_cu;
8570 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8572 /* If we're using .gdb_index (includes -readnow) then
8573 per_cu->type_unit_group may not have been set up yet. */
8574 if (sig_type->type_unit_group == NULL)
8575 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8576 tu_group = sig_type->type_unit_group;
8578 /* If we've already processed this stmt_list there's no real need to
8579 do it again, we could fake it and just recreate the part we need
8580 (file name,index -> symtab mapping). If data shows this optimization
8581 is useful we can do it then. */
8582 first_time = tu_group->primary_symtab == NULL;
8584 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8589 line_offset = DW_UNSND (attr);
8590 lh = dwarf_decode_line_header (line_offset, cu);
8595 dwarf2_start_symtab (cu, "", NULL, 0);
8598 gdb_assert (tu_group->symtabs == NULL);
8601 /* Note: The primary symtab will get allocated at the end. */
8605 cu->line_header = lh;
8606 make_cleanup (free_cu_line_header, cu);
8610 dwarf2_start_symtab (cu, "", NULL, 0);
8612 tu_group->num_symtabs = lh->num_file_names;
8613 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8615 for (i = 0; i < lh->num_file_names; ++i)
8617 const char *dir = NULL;
8618 struct file_entry *fe = &lh->file_names[i];
8621 dir = lh->include_dirs[fe->dir_index - 1];
8622 dwarf2_start_subfile (fe->name, dir, NULL);
8624 /* Note: We don't have to watch for the main subfile here, type units
8625 don't have DW_AT_name. */
8627 if (current_subfile->symtab == NULL)
8629 /* NOTE: start_subfile will recognize when it's been passed
8630 a file it has already seen. So we can't assume there's a
8631 simple mapping from lh->file_names to subfiles,
8632 lh->file_names may contain dups. */
8633 current_subfile->symtab = allocate_symtab (current_subfile->name,
8637 fe->symtab = current_subfile->symtab;
8638 tu_group->symtabs[i] = fe->symtab;
8645 for (i = 0; i < lh->num_file_names; ++i)
8647 struct file_entry *fe = &lh->file_names[i];
8649 fe->symtab = tu_group->symtabs[i];
8653 /* The main symtab is allocated last. Type units don't have DW_AT_name
8654 so they don't have a "real" (so to speak) symtab anyway.
8655 There is later code that will assign the main symtab to all symbols
8656 that don't have one. We need to handle the case of a symbol with a
8657 missing symtab (DW_AT_decl_file) anyway. */
8660 /* Process DW_TAG_type_unit.
8661 For TUs we want to skip the first top level sibling if it's not the
8662 actual type being defined by this TU. In this case the first top
8663 level sibling is there to provide context only. */
8666 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8668 struct die_info *child_die;
8670 prepare_one_comp_unit (cu, die, language_minimal);
8672 /* Initialize (or reinitialize) the machinery for building symtabs.
8673 We do this before processing child DIEs, so that the line header table
8674 is available for DW_AT_decl_file. */
8675 setup_type_unit_groups (die, cu);
8677 if (die->child != NULL)
8679 child_die = die->child;
8680 while (child_die && child_die->tag)
8682 process_die (child_die, cu);
8683 child_die = sibling_die (child_die);
8690 http://gcc.gnu.org/wiki/DebugFission
8691 http://gcc.gnu.org/wiki/DebugFissionDWP
8693 To simplify handling of both DWO files ("object" files with the DWARF info)
8694 and DWP files (a file with the DWOs packaged up into one file), we treat
8695 DWP files as having a collection of virtual DWO files. */
8698 hash_dwo_file (const void *item)
8700 const struct dwo_file *dwo_file = item;
8703 hash = htab_hash_string (dwo_file->dwo_name);
8704 if (dwo_file->comp_dir != NULL)
8705 hash += htab_hash_string (dwo_file->comp_dir);
8710 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8712 const struct dwo_file *lhs = item_lhs;
8713 const struct dwo_file *rhs = item_rhs;
8715 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
8717 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
8718 return lhs->comp_dir == rhs->comp_dir;
8719 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
8722 /* Allocate a hash table for DWO files. */
8725 allocate_dwo_file_hash_table (void)
8727 struct objfile *objfile = dwarf2_per_objfile->objfile;
8729 return htab_create_alloc_ex (41,
8733 &objfile->objfile_obstack,
8734 hashtab_obstack_allocate,
8735 dummy_obstack_deallocate);
8738 /* Lookup DWO file DWO_NAME. */
8741 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8743 struct dwo_file find_entry;
8746 if (dwarf2_per_objfile->dwo_files == NULL)
8747 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8749 memset (&find_entry, 0, sizeof (find_entry));
8750 find_entry.dwo_name = dwo_name;
8751 find_entry.comp_dir = comp_dir;
8752 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8758 hash_dwo_unit (const void *item)
8760 const struct dwo_unit *dwo_unit = item;
8762 /* This drops the top 32 bits of the id, but is ok for a hash. */
8763 return dwo_unit->signature;
8767 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8769 const struct dwo_unit *lhs = item_lhs;
8770 const struct dwo_unit *rhs = item_rhs;
8772 /* The signature is assumed to be unique within the DWO file.
8773 So while object file CU dwo_id's always have the value zero,
8774 that's OK, assuming each object file DWO file has only one CU,
8775 and that's the rule for now. */
8776 return lhs->signature == rhs->signature;
8779 /* Allocate a hash table for DWO CUs,TUs.
8780 There is one of these tables for each of CUs,TUs for each DWO file. */
8783 allocate_dwo_unit_table (struct objfile *objfile)
8785 /* Start out with a pretty small number.
8786 Generally DWO files contain only one CU and maybe some TUs. */
8787 return htab_create_alloc_ex (3,
8791 &objfile->objfile_obstack,
8792 hashtab_obstack_allocate,
8793 dummy_obstack_deallocate);
8796 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8798 struct create_dwo_cu_data
8800 struct dwo_file *dwo_file;
8801 struct dwo_unit dwo_unit;
8804 /* die_reader_func for create_dwo_cu. */
8807 create_dwo_cu_reader (const struct die_reader_specs *reader,
8808 const gdb_byte *info_ptr,
8809 struct die_info *comp_unit_die,
8813 struct dwarf2_cu *cu = reader->cu;
8814 struct objfile *objfile = dwarf2_per_objfile->objfile;
8815 sect_offset offset = cu->per_cu->offset;
8816 struct dwarf2_section_info *section = cu->per_cu->section;
8817 struct create_dwo_cu_data *data = datap;
8818 struct dwo_file *dwo_file = data->dwo_file;
8819 struct dwo_unit *dwo_unit = &data->dwo_unit;
8820 struct attribute *attr;
8822 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8825 complaint (&symfile_complaints,
8826 _("Dwarf Error: debug entry at offset 0x%x is missing"
8827 " its dwo_id [in module %s]"),
8828 offset.sect_off, dwo_file->dwo_name);
8832 dwo_unit->dwo_file = dwo_file;
8833 dwo_unit->signature = DW_UNSND (attr);
8834 dwo_unit->section = section;
8835 dwo_unit->offset = offset;
8836 dwo_unit->length = cu->per_cu->length;
8838 if (dwarf2_read_debug)
8839 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8840 offset.sect_off, hex_string (dwo_unit->signature));
8843 /* Create the dwo_unit for the lone CU in DWO_FILE.
8844 Note: This function processes DWO files only, not DWP files. */
8846 static struct dwo_unit *
8847 create_dwo_cu (struct dwo_file *dwo_file)
8849 struct objfile *objfile = dwarf2_per_objfile->objfile;
8850 struct dwarf2_section_info *section = &dwo_file->sections.info;
8853 const gdb_byte *info_ptr, *end_ptr;
8854 struct create_dwo_cu_data create_dwo_cu_data;
8855 struct dwo_unit *dwo_unit;
8857 dwarf2_read_section (objfile, section);
8858 info_ptr = section->buffer;
8860 if (info_ptr == NULL)
8863 /* We can't set abfd until now because the section may be empty or
8864 not present, in which case section->asection will be NULL. */
8865 abfd = section->asection->owner;
8867 if (dwarf2_read_debug)
8869 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8870 bfd_section_name (abfd, section->asection),
8871 bfd_get_filename (abfd));
8874 create_dwo_cu_data.dwo_file = dwo_file;
8877 end_ptr = info_ptr + section->size;
8878 while (info_ptr < end_ptr)
8880 struct dwarf2_per_cu_data per_cu;
8882 memset (&create_dwo_cu_data.dwo_unit, 0,
8883 sizeof (create_dwo_cu_data.dwo_unit));
8884 memset (&per_cu, 0, sizeof (per_cu));
8885 per_cu.objfile = objfile;
8886 per_cu.is_debug_types = 0;
8887 per_cu.offset.sect_off = info_ptr - section->buffer;
8888 per_cu.section = section;
8890 init_cutu_and_read_dies_no_follow (&per_cu,
8891 &dwo_file->sections.abbrev,
8893 create_dwo_cu_reader,
8894 &create_dwo_cu_data);
8896 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8898 /* If we've already found one, complain. We only support one
8899 because having more than one requires hacking the dwo_name of
8900 each to match, which is highly unlikely to happen. */
8901 if (dwo_unit != NULL)
8903 complaint (&symfile_complaints,
8904 _("Multiple CUs in DWO file %s [in module %s]"),
8905 dwo_file->dwo_name, objfile->name);
8909 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8910 *dwo_unit = create_dwo_cu_data.dwo_unit;
8913 info_ptr += per_cu.length;
8919 /* DWP file .debug_{cu,tu}_index section format:
8920 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8924 Both index sections have the same format, and serve to map a 64-bit
8925 signature to a set of section numbers. Each section begins with a header,
8926 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8927 indexes, and a pool of 32-bit section numbers. The index sections will be
8928 aligned at 8-byte boundaries in the file.
8930 The index section header consists of:
8932 V, 32 bit version number
8934 N, 32 bit number of compilation units or type units in the index
8935 M, 32 bit number of slots in the hash table
8937 Numbers are recorded using the byte order of the application binary.
8939 We assume that N and M will not exceed 2^32 - 1.
8941 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8943 The hash table begins at offset 16 in the section, and consists of an array
8944 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8945 order of the application binary). Unused slots in the hash table are 0.
8946 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8948 The parallel table begins immediately after the hash table
8949 (at offset 16 + 8 * M from the beginning of the section), and consists of an
8950 array of 32-bit indexes (using the byte order of the application binary),
8951 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8952 table contains a 32-bit index into the pool of section numbers. For unused
8953 hash table slots, the corresponding entry in the parallel table will be 0.
8955 Given a 64-bit compilation unit signature or a type signature S, an entry
8956 in the hash table is located as follows:
8958 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8959 the low-order k bits all set to 1.
8961 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8963 3) If the hash table entry at index H matches the signature, use that
8964 entry. If the hash table entry at index H is unused (all zeroes),
8965 terminate the search: the signature is not present in the table.
8967 4) Let H = (H + H') modulo M. Repeat at Step 3.
8969 Because M > N and H' and M are relatively prime, the search is guaranteed
8970 to stop at an unused slot or find the match.
8972 The pool of section numbers begins immediately following the hash table
8973 (at offset 16 + 12 * M from the beginning of the section). The pool of
8974 section numbers consists of an array of 32-bit words (using the byte order
8975 of the application binary). Each item in the array is indexed starting
8976 from 0. The hash table entry provides the index of the first section
8977 number in the set. Additional section numbers in the set follow, and the
8978 set is terminated by a 0 entry (section number 0 is not used in ELF).
8980 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8981 section must be the first entry in the set, and the .debug_abbrev.dwo must
8982 be the second entry. Other members of the set may follow in any order. */
8984 /* Create a hash table to map DWO IDs to their CU/TU entry in
8985 .debug_{info,types}.dwo in DWP_FILE.
8986 Returns NULL if there isn't one.
8987 Note: This function processes DWP files only, not DWO files. */
8989 static struct dwp_hash_table *
8990 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8992 struct objfile *objfile = dwarf2_per_objfile->objfile;
8993 bfd *dbfd = dwp_file->dbfd;
8994 const gdb_byte *index_ptr, *index_end;
8995 struct dwarf2_section_info *index;
8996 uint32_t version, nr_units, nr_slots;
8997 struct dwp_hash_table *htab;
9000 index = &dwp_file->sections.tu_index;
9002 index = &dwp_file->sections.cu_index;
9004 if (dwarf2_section_empty_p (index))
9006 dwarf2_read_section (objfile, index);
9008 index_ptr = index->buffer;
9009 index_end = index_ptr + index->size;
9011 version = read_4_bytes (dbfd, index_ptr);
9012 index_ptr += 8; /* Skip the unused word. */
9013 nr_units = read_4_bytes (dbfd, index_ptr);
9015 nr_slots = read_4_bytes (dbfd, index_ptr);
9020 error (_("Dwarf Error: unsupported DWP file version (%s)"
9022 pulongest (version), dwp_file->name);
9024 if (nr_slots != (nr_slots & -nr_slots))
9026 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9027 " is not power of 2 [in module %s]"),
9028 pulongest (nr_slots), dwp_file->name);
9031 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9032 htab->nr_units = nr_units;
9033 htab->nr_slots = nr_slots;
9034 htab->hash_table = index_ptr;
9035 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9036 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
9041 /* Update SECTIONS with the data from SECTP.
9043 This function is like the other "locate" section routines that are
9044 passed to bfd_map_over_sections, but in this context the sections to
9045 read comes from the DWP hash table, not the full ELF section table.
9047 The result is non-zero for success, or zero if an error was found. */
9050 locate_virtual_dwo_sections (asection *sectp,
9051 struct virtual_dwo_sections *sections)
9053 const struct dwop_section_names *names = &dwop_section_names;
9055 if (section_is_p (sectp->name, &names->abbrev_dwo))
9057 /* There can be only one. */
9058 if (sections->abbrev.asection != NULL)
9060 sections->abbrev.asection = sectp;
9061 sections->abbrev.size = bfd_get_section_size (sectp);
9063 else if (section_is_p (sectp->name, &names->info_dwo)
9064 || section_is_p (sectp->name, &names->types_dwo))
9066 /* There can be only one. */
9067 if (sections->info_or_types.asection != NULL)
9069 sections->info_or_types.asection = sectp;
9070 sections->info_or_types.size = bfd_get_section_size (sectp);
9072 else if (section_is_p (sectp->name, &names->line_dwo))
9074 /* There can be only one. */
9075 if (sections->line.asection != NULL)
9077 sections->line.asection = sectp;
9078 sections->line.size = bfd_get_section_size (sectp);
9080 else if (section_is_p (sectp->name, &names->loc_dwo))
9082 /* There can be only one. */
9083 if (sections->loc.asection != NULL)
9085 sections->loc.asection = sectp;
9086 sections->loc.size = bfd_get_section_size (sectp);
9088 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9090 /* There can be only one. */
9091 if (sections->macinfo.asection != NULL)
9093 sections->macinfo.asection = sectp;
9094 sections->macinfo.size = bfd_get_section_size (sectp);
9096 else if (section_is_p (sectp->name, &names->macro_dwo))
9098 /* There can be only one. */
9099 if (sections->macro.asection != NULL)
9101 sections->macro.asection = sectp;
9102 sections->macro.size = bfd_get_section_size (sectp);
9104 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9106 /* There can be only one. */
9107 if (sections->str_offsets.asection != NULL)
9109 sections->str_offsets.asection = sectp;
9110 sections->str_offsets.size = bfd_get_section_size (sectp);
9114 /* No other kind of section is valid. */
9121 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
9122 HTAB is the hash table from the DWP file.
9123 SECTION_INDEX is the index of the DWO in HTAB.
9124 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
9126 static struct dwo_unit *
9127 create_dwo_in_dwp (struct dwp_file *dwp_file,
9128 const struct dwp_hash_table *htab,
9129 uint32_t section_index,
9130 const char *comp_dir,
9131 ULONGEST signature, int is_debug_types)
9133 struct objfile *objfile = dwarf2_per_objfile->objfile;
9134 bfd *dbfd = dwp_file->dbfd;
9135 const char *kind = is_debug_types ? "TU" : "CU";
9136 struct dwo_file *dwo_file;
9137 struct dwo_unit *dwo_unit;
9138 struct virtual_dwo_sections sections;
9139 void **dwo_file_slot;
9140 char *virtual_dwo_name;
9141 struct dwarf2_section_info *cutu;
9142 struct cleanup *cleanups;
9145 if (dwarf2_read_debug)
9147 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP file: %s\n",
9149 pulongest (section_index), hex_string (signature),
9153 /* Fetch the sections of this DWO.
9154 Put a limit on the number of sections we look for so that bad data
9155 doesn't cause us to loop forever. */
9157 #define MAX_NR_DWO_SECTIONS \
9158 (1 /* .debug_info or .debug_types */ \
9159 + 1 /* .debug_abbrev */ \
9160 + 1 /* .debug_line */ \
9161 + 1 /* .debug_loc */ \
9162 + 1 /* .debug_str_offsets */ \
9163 + 1 /* .debug_macro */ \
9164 + 1 /* .debug_macinfo */ \
9165 + 1 /* trailing zero */)
9167 memset (§ions, 0, sizeof (sections));
9168 cleanups = make_cleanup (null_cleanup, 0);
9170 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
9173 uint32_t section_nr =
9176 + (section_index + i) * sizeof (uint32_t));
9178 if (section_nr == 0)
9180 if (section_nr >= dwp_file->num_sections)
9182 error (_("Dwarf Error: bad DWP hash table, section number too large"
9187 sectp = dwp_file->elf_sections[section_nr];
9188 if (! locate_virtual_dwo_sections (sectp, §ions))
9190 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9197 || sections.info_or_types.asection == NULL
9198 || sections.abbrev.asection == NULL)
9200 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9204 if (i == MAX_NR_DWO_SECTIONS)
9206 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9211 /* It's easier for the rest of the code if we fake a struct dwo_file and
9212 have dwo_unit "live" in that. At least for now.
9214 The DWP file can be made up of a random collection of CUs and TUs.
9215 However, for each CU + set of TUs that came from the same original DWO
9216 file, we want to combine them back into a virtual DWO file to save space
9217 (fewer struct dwo_file objects to allocated). Remember that for really
9218 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9221 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9222 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
9223 sections.line.asection ? sections.line.asection->id : 0,
9224 sections.loc.asection ? sections.loc.asection->id : 0,
9225 (sections.str_offsets.asection
9226 ? sections.str_offsets.asection->id
9228 make_cleanup (xfree, virtual_dwo_name);
9229 /* Can we use an existing virtual DWO file? */
9230 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9231 /* Create one if necessary. */
9232 if (*dwo_file_slot == NULL)
9234 if (dwarf2_read_debug)
9236 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9239 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9240 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9242 strlen (virtual_dwo_name));
9243 dwo_file->comp_dir = comp_dir;
9244 dwo_file->sections.abbrev = sections.abbrev;
9245 dwo_file->sections.line = sections.line;
9246 dwo_file->sections.loc = sections.loc;
9247 dwo_file->sections.macinfo = sections.macinfo;
9248 dwo_file->sections.macro = sections.macro;
9249 dwo_file->sections.str_offsets = sections.str_offsets;
9250 /* The "str" section is global to the entire DWP file. */
9251 dwo_file->sections.str = dwp_file->sections.str;
9252 /* The info or types section is assigned later to dwo_unit,
9253 there's no need to record it in dwo_file.
9254 Also, we can't simply record type sections in dwo_file because
9255 we record a pointer into the vector in dwo_unit. As we collect more
9256 types we'll grow the vector and eventually have to reallocate space
9257 for it, invalidating all the pointers into the current copy. */
9258 *dwo_file_slot = dwo_file;
9262 if (dwarf2_read_debug)
9264 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9267 dwo_file = *dwo_file_slot;
9269 do_cleanups (cleanups);
9271 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9272 dwo_unit->dwo_file = dwo_file;
9273 dwo_unit->signature = signature;
9274 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9275 sizeof (struct dwarf2_section_info));
9276 *dwo_unit->section = sections.info_or_types;
9277 /* offset, length, type_offset_in_tu are set later. */
9282 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
9284 static struct dwo_unit *
9285 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
9286 const struct dwp_hash_table *htab,
9287 const char *comp_dir,
9288 ULONGEST signature, int is_debug_types)
9290 bfd *dbfd = dwp_file->dbfd;
9291 uint32_t mask = htab->nr_slots - 1;
9292 uint32_t hash = signature & mask;
9293 uint32_t hash2 = ((signature >> 32) & mask) | 1;
9296 struct dwo_unit find_dwo_cu, *dwo_cu;
9298 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
9299 find_dwo_cu.signature = signature;
9300 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
9305 /* Use a for loop so that we don't loop forever on bad debug info. */
9306 for (i = 0; i < htab->nr_slots; ++i)
9308 ULONGEST signature_in_table;
9310 signature_in_table =
9311 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
9312 if (signature_in_table == signature)
9314 uint32_t section_index =
9315 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
9317 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
9318 comp_dir, signature, is_debug_types);
9321 if (signature_in_table == 0)
9323 hash = (hash + hash2) & mask;
9326 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
9331 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
9332 Open the file specified by FILE_NAME and hand it off to BFD for
9333 preliminary analysis. Return a newly initialized bfd *, which
9334 includes a canonicalized copy of FILE_NAME.
9335 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
9336 SEARCH_CWD is true if the current directory is to be searched.
9337 It will be searched before debug-file-directory.
9338 If unable to find/open the file, return NULL.
9339 NOTE: This function is derived from symfile_bfd_open. */
9342 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
9346 char *absolute_name;
9347 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
9348 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
9349 to debug_file_directory. */
9351 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
9355 if (*debug_file_directory != '\0')
9356 search_path = concat (".", dirname_separator_string,
9357 debug_file_directory, NULL);
9359 search_path = xstrdup (".");
9362 search_path = xstrdup (debug_file_directory);
9366 flags |= OPF_SEARCH_IN_PATH;
9367 desc = openp (search_path, flags, file_name,
9368 O_RDONLY | O_BINARY, &absolute_name);
9369 xfree (search_path);
9373 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
9374 xfree (absolute_name);
9375 if (sym_bfd == NULL)
9377 bfd_set_cacheable (sym_bfd, 1);
9379 if (!bfd_check_format (sym_bfd, bfd_object))
9381 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
9388 /* Try to open DWO file FILE_NAME.
9389 COMP_DIR is the DW_AT_comp_dir attribute.
9390 The result is the bfd handle of the file.
9391 If there is a problem finding or opening the file, return NULL.
9392 Upon success, the canonicalized path of the file is stored in the bfd,
9393 same as symfile_bfd_open. */
9396 open_dwo_file (const char *file_name, const char *comp_dir)
9400 if (IS_ABSOLUTE_PATH (file_name))
9401 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
9403 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
9405 if (comp_dir != NULL)
9407 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
9409 /* NOTE: If comp_dir is a relative path, this will also try the
9410 search path, which seems useful. */
9411 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
9412 xfree (path_to_try);
9417 /* That didn't work, try debug-file-directory, which, despite its name,
9418 is a list of paths. */
9420 if (*debug_file_directory == '\0')
9423 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
9426 /* This function is mapped across the sections and remembers the offset and
9427 size of each of the DWO debugging sections we are interested in. */
9430 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9432 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9433 const struct dwop_section_names *names = &dwop_section_names;
9435 if (section_is_p (sectp->name, &names->abbrev_dwo))
9437 dwo_sections->abbrev.asection = sectp;
9438 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9440 else if (section_is_p (sectp->name, &names->info_dwo))
9442 dwo_sections->info.asection = sectp;
9443 dwo_sections->info.size = bfd_get_section_size (sectp);
9445 else if (section_is_p (sectp->name, &names->line_dwo))
9447 dwo_sections->line.asection = sectp;
9448 dwo_sections->line.size = bfd_get_section_size (sectp);
9450 else if (section_is_p (sectp->name, &names->loc_dwo))
9452 dwo_sections->loc.asection = sectp;
9453 dwo_sections->loc.size = bfd_get_section_size (sectp);
9455 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9457 dwo_sections->macinfo.asection = sectp;
9458 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9460 else if (section_is_p (sectp->name, &names->macro_dwo))
9462 dwo_sections->macro.asection = sectp;
9463 dwo_sections->macro.size = bfd_get_section_size (sectp);
9465 else if (section_is_p (sectp->name, &names->str_dwo))
9467 dwo_sections->str.asection = sectp;
9468 dwo_sections->str.size = bfd_get_section_size (sectp);
9470 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9472 dwo_sections->str_offsets.asection = sectp;
9473 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9475 else if (section_is_p (sectp->name, &names->types_dwo))
9477 struct dwarf2_section_info type_section;
9479 memset (&type_section, 0, sizeof (type_section));
9480 type_section.asection = sectp;
9481 type_section.size = bfd_get_section_size (sectp);
9482 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9487 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9488 by PER_CU. This is for the non-DWP case.
9489 The result is NULL if DWO_NAME can't be found. */
9491 static struct dwo_file *
9492 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9493 const char *dwo_name, const char *comp_dir)
9495 struct objfile *objfile = dwarf2_per_objfile->objfile;
9496 struct dwo_file *dwo_file;
9498 struct cleanup *cleanups;
9500 dbfd = open_dwo_file (dwo_name, comp_dir);
9503 if (dwarf2_read_debug)
9504 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9507 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9508 dwo_file->dwo_name = dwo_name;
9509 dwo_file->comp_dir = comp_dir;
9510 dwo_file->dbfd = dbfd;
9512 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9514 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9516 dwo_file->cu = create_dwo_cu (dwo_file);
9518 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9519 dwo_file->sections.types);
9521 discard_cleanups (cleanups);
9523 if (dwarf2_read_debug)
9524 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9529 /* This function is mapped across the sections and remembers the offset and
9530 size of each of the DWP debugging sections we are interested in. */
9533 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9535 struct dwp_file *dwp_file = dwp_file_ptr;
9536 const struct dwop_section_names *names = &dwop_section_names;
9537 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9539 /* Record the ELF section number for later lookup: this is what the
9540 .debug_cu_index,.debug_tu_index tables use. */
9541 gdb_assert (elf_section_nr < dwp_file->num_sections);
9542 dwp_file->elf_sections[elf_section_nr] = sectp;
9544 /* Look for specific sections that we need. */
9545 if (section_is_p (sectp->name, &names->str_dwo))
9547 dwp_file->sections.str.asection = sectp;
9548 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9550 else if (section_is_p (sectp->name, &names->cu_index))
9552 dwp_file->sections.cu_index.asection = sectp;
9553 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9555 else if (section_is_p (sectp->name, &names->tu_index))
9557 dwp_file->sections.tu_index.asection = sectp;
9558 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9562 /* Hash function for dwp_file loaded CUs/TUs. */
9565 hash_dwp_loaded_cutus (const void *item)
9567 const struct dwo_unit *dwo_unit = item;
9569 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9570 return dwo_unit->signature;
9573 /* Equality function for dwp_file loaded CUs/TUs. */
9576 eq_dwp_loaded_cutus (const void *a, const void *b)
9578 const struct dwo_unit *dua = a;
9579 const struct dwo_unit *dub = b;
9581 return dua->signature == dub->signature;
9584 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9587 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9589 return htab_create_alloc_ex (3,
9590 hash_dwp_loaded_cutus,
9591 eq_dwp_loaded_cutus,
9593 &objfile->objfile_obstack,
9594 hashtab_obstack_allocate,
9595 dummy_obstack_deallocate);
9598 /* Try to open DWP file FILE_NAME.
9599 The result is the bfd handle of the file.
9600 If there is a problem finding or opening the file, return NULL.
9601 Upon success, the canonicalized path of the file is stored in the bfd,
9602 same as symfile_bfd_open. */
9605 open_dwp_file (const char *file_name)
9609 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
9613 /* Work around upstream bug 15652.
9614 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
9615 [Whether that's a "bug" is debatable, but it is getting in our way.]
9616 We have no real idea where the dwp file is, because gdb's realpath-ing
9617 of the executable's path may have discarded the needed info.
9618 [IWBN if the dwp file name was recorded in the executable, akin to
9619 .gnu_debuglink, but that doesn't exist yet.]
9620 Strip the directory from FILE_NAME and search again. */
9621 if (*debug_file_directory != '\0')
9623 /* Don't implicitly search the current directory here.
9624 If the user wants to search "." to handle this case,
9625 it must be added to debug-file-directory. */
9626 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
9633 /* Initialize the use of the DWP file for the current objfile.
9634 By convention the name of the DWP file is ${objfile}.dwp.
9635 The result is NULL if it can't be found. */
9637 static struct dwp_file *
9638 open_and_init_dwp_file (void)
9640 struct objfile *objfile = dwarf2_per_objfile->objfile;
9641 struct dwp_file *dwp_file;
9644 struct cleanup *cleanups;
9646 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9647 cleanups = make_cleanup (xfree, dwp_name);
9649 dbfd = open_dwp_file (dwp_name);
9652 if (dwarf2_read_debug)
9653 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9654 do_cleanups (cleanups);
9657 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9658 dwp_file->name = bfd_get_filename (dbfd);
9659 dwp_file->dbfd = dbfd;
9660 do_cleanups (cleanups);
9662 /* +1: section 0 is unused */
9663 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9664 dwp_file->elf_sections =
9665 OBSTACK_CALLOC (&objfile->objfile_obstack,
9666 dwp_file->num_sections, asection *);
9668 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9670 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9672 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9674 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9676 if (dwarf2_read_debug)
9678 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9679 fprintf_unfiltered (gdb_stdlog,
9680 " %s CUs, %s TUs\n",
9681 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
9682 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
9688 /* Wrapper around open_and_init_dwp_file, only open it once. */
9690 static struct dwp_file *
9693 if (! dwarf2_per_objfile->dwp_checked)
9695 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9696 dwarf2_per_objfile->dwp_checked = 1;
9698 return dwarf2_per_objfile->dwp_file;
9701 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9702 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9703 or in the DWP file for the objfile, referenced by THIS_UNIT.
9704 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9705 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9707 This is called, for example, when wanting to read a variable with a
9708 complex location. Therefore we don't want to do file i/o for every call.
9709 Therefore we don't want to look for a DWO file on every call.
9710 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9711 then we check if we've already seen DWO_NAME, and only THEN do we check
9714 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9715 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9717 static struct dwo_unit *
9718 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9719 const char *dwo_name, const char *comp_dir,
9720 ULONGEST signature, int is_debug_types)
9722 struct objfile *objfile = dwarf2_per_objfile->objfile;
9723 const char *kind = is_debug_types ? "TU" : "CU";
9724 void **dwo_file_slot;
9725 struct dwo_file *dwo_file;
9726 struct dwp_file *dwp_file;
9728 /* First see if there's a DWP file.
9729 If we have a DWP file but didn't find the DWO inside it, don't
9730 look for the original DWO file. It makes gdb behave differently
9731 depending on whether one is debugging in the build tree. */
9733 dwp_file = get_dwp_file ();
9734 if (dwp_file != NULL)
9736 const struct dwp_hash_table *dwp_htab =
9737 is_debug_types ? dwp_file->tus : dwp_file->cus;
9739 if (dwp_htab != NULL)
9741 struct dwo_unit *dwo_cutu =
9742 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9743 signature, is_debug_types);
9745 if (dwo_cutu != NULL)
9747 if (dwarf2_read_debug)
9749 fprintf_unfiltered (gdb_stdlog,
9750 "Virtual DWO %s %s found: @%s\n",
9751 kind, hex_string (signature),
9752 host_address_to_string (dwo_cutu));
9760 /* No DWP file, look for the DWO file. */
9762 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9763 if (*dwo_file_slot == NULL)
9765 /* Read in the file and build a table of the CUs/TUs it contains. */
9766 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9768 /* NOTE: This will be NULL if unable to open the file. */
9769 dwo_file = *dwo_file_slot;
9771 if (dwo_file != NULL)
9773 struct dwo_unit *dwo_cutu = NULL;
9775 if (is_debug_types && dwo_file->tus)
9777 struct dwo_unit find_dwo_cutu;
9779 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9780 find_dwo_cutu.signature = signature;
9781 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9783 else if (!is_debug_types && dwo_file->cu)
9785 if (signature == dwo_file->cu->signature)
9786 dwo_cutu = dwo_file->cu;
9789 if (dwo_cutu != NULL)
9791 if (dwarf2_read_debug)
9793 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9794 kind, dwo_name, hex_string (signature),
9795 host_address_to_string (dwo_cutu));
9802 /* We didn't find it. This could mean a dwo_id mismatch, or
9803 someone deleted the DWO/DWP file, or the search path isn't set up
9804 correctly to find the file. */
9806 if (dwarf2_read_debug)
9808 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9809 kind, dwo_name, hex_string (signature));
9812 /* This is a warning and not a complaint because it can be caused by
9813 pilot error (e.g., user accidentally deleting the DWO). */
9814 warning (_("Could not find DWO %s %s(%s) referenced by %s at offset 0x%x"
9816 kind, dwo_name, hex_string (signature),
9817 this_unit->is_debug_types ? "TU" : "CU",
9818 this_unit->offset.sect_off, objfile->name);
9822 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9823 See lookup_dwo_cutu_unit for details. */
9825 static struct dwo_unit *
9826 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9827 const char *dwo_name, const char *comp_dir,
9830 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9833 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9834 See lookup_dwo_cutu_unit for details. */
9836 static struct dwo_unit *
9837 lookup_dwo_type_unit (struct signatured_type *this_tu,
9838 const char *dwo_name, const char *comp_dir)
9840 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9843 /* Free all resources associated with DWO_FILE.
9844 Close the DWO file and munmap the sections.
9845 All memory should be on the objfile obstack. */
9848 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9851 struct dwarf2_section_info *section;
9853 /* Note: dbfd is NULL for virtual DWO files. */
9854 gdb_bfd_unref (dwo_file->dbfd);
9856 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9859 /* Wrapper for free_dwo_file for use in cleanups. */
9862 free_dwo_file_cleanup (void *arg)
9864 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9865 struct objfile *objfile = dwarf2_per_objfile->objfile;
9867 free_dwo_file (dwo_file, objfile);
9870 /* Traversal function for free_dwo_files. */
9873 free_dwo_file_from_slot (void **slot, void *info)
9875 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9876 struct objfile *objfile = (struct objfile *) info;
9878 free_dwo_file (dwo_file, objfile);
9883 /* Free all resources associated with DWO_FILES. */
9886 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9888 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9891 /* Read in various DIEs. */
9893 /* qsort helper for inherit_abstract_dies. */
9896 unsigned_int_compar (const void *ap, const void *bp)
9898 unsigned int a = *(unsigned int *) ap;
9899 unsigned int b = *(unsigned int *) bp;
9901 return (a > b) - (b > a);
9904 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9905 Inherit only the children of the DW_AT_abstract_origin DIE not being
9906 already referenced by DW_AT_abstract_origin from the children of the
9910 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9912 struct die_info *child_die;
9913 unsigned die_children_count;
9914 /* CU offsets which were referenced by children of the current DIE. */
9915 sect_offset *offsets;
9916 sect_offset *offsets_end, *offsetp;
9917 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9918 struct die_info *origin_die;
9919 /* Iterator of the ORIGIN_DIE children. */
9920 struct die_info *origin_child_die;
9921 struct cleanup *cleanups;
9922 struct attribute *attr;
9923 struct dwarf2_cu *origin_cu;
9924 struct pending **origin_previous_list_in_scope;
9926 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9930 /* Note that following die references may follow to a die in a
9934 origin_die = follow_die_ref (die, attr, &origin_cu);
9936 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9938 origin_previous_list_in_scope = origin_cu->list_in_scope;
9939 origin_cu->list_in_scope = cu->list_in_scope;
9941 if (die->tag != origin_die->tag
9942 && !(die->tag == DW_TAG_inlined_subroutine
9943 && origin_die->tag == DW_TAG_subprogram))
9944 complaint (&symfile_complaints,
9945 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9946 die->offset.sect_off, origin_die->offset.sect_off);
9948 child_die = die->child;
9949 die_children_count = 0;
9950 while (child_die && child_die->tag)
9952 child_die = sibling_die (child_die);
9953 die_children_count++;
9955 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9956 cleanups = make_cleanup (xfree, offsets);
9958 offsets_end = offsets;
9959 child_die = die->child;
9960 while (child_die && child_die->tag)
9962 /* For each CHILD_DIE, find the corresponding child of
9963 ORIGIN_DIE. If there is more than one layer of
9964 DW_AT_abstract_origin, follow them all; there shouldn't be,
9965 but GCC versions at least through 4.4 generate this (GCC PR
9967 struct die_info *child_origin_die = child_die;
9968 struct dwarf2_cu *child_origin_cu = cu;
9972 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9976 child_origin_die = follow_die_ref (child_origin_die, attr,
9980 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9981 counterpart may exist. */
9982 if (child_origin_die != child_die)
9984 if (child_die->tag != child_origin_die->tag
9985 && !(child_die->tag == DW_TAG_inlined_subroutine
9986 && child_origin_die->tag == DW_TAG_subprogram))
9987 complaint (&symfile_complaints,
9988 _("Child DIE 0x%x and its abstract origin 0x%x have "
9989 "different tags"), child_die->offset.sect_off,
9990 child_origin_die->offset.sect_off);
9991 if (child_origin_die->parent != origin_die)
9992 complaint (&symfile_complaints,
9993 _("Child DIE 0x%x and its abstract origin 0x%x have "
9994 "different parents"), child_die->offset.sect_off,
9995 child_origin_die->offset.sect_off);
9997 *offsets_end++ = child_origin_die->offset;
9999 child_die = sibling_die (child_die);
10001 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
10002 unsigned_int_compar);
10003 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
10004 if (offsetp[-1].sect_off == offsetp->sect_off)
10005 complaint (&symfile_complaints,
10006 _("Multiple children of DIE 0x%x refer "
10007 "to DIE 0x%x as their abstract origin"),
10008 die->offset.sect_off, offsetp->sect_off);
10011 origin_child_die = origin_die->child;
10012 while (origin_child_die && origin_child_die->tag)
10014 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
10015 while (offsetp < offsets_end
10016 && offsetp->sect_off < origin_child_die->offset.sect_off)
10018 if (offsetp >= offsets_end
10019 || offsetp->sect_off > origin_child_die->offset.sect_off)
10021 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
10022 process_die (origin_child_die, origin_cu);
10024 origin_child_die = sibling_die (origin_child_die);
10026 origin_cu->list_in_scope = origin_previous_list_in_scope;
10028 do_cleanups (cleanups);
10032 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
10034 struct objfile *objfile = cu->objfile;
10035 struct context_stack *new;
10038 struct die_info *child_die;
10039 struct attribute *attr, *call_line, *call_file;
10041 CORE_ADDR baseaddr;
10042 struct block *block;
10043 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
10044 VEC (symbolp) *template_args = NULL;
10045 struct template_symbol *templ_func = NULL;
10049 /* If we do not have call site information, we can't show the
10050 caller of this inlined function. That's too confusing, so
10051 only use the scope for local variables. */
10052 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
10053 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
10054 if (call_line == NULL || call_file == NULL)
10056 read_lexical_block_scope (die, cu);
10061 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10063 name = dwarf2_name (die, cu);
10065 /* Ignore functions with missing or empty names. These are actually
10066 illegal according to the DWARF standard. */
10069 complaint (&symfile_complaints,
10070 _("missing name for subprogram DIE at %d"),
10071 die->offset.sect_off);
10075 /* Ignore functions with missing or invalid low and high pc attributes. */
10076 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10078 attr = dwarf2_attr (die, DW_AT_external, cu);
10079 if (!attr || !DW_UNSND (attr))
10080 complaint (&symfile_complaints,
10081 _("cannot get low and high bounds "
10082 "for subprogram DIE at %d"),
10083 die->offset.sect_off);
10088 highpc += baseaddr;
10090 /* If we have any template arguments, then we must allocate a
10091 different sort of symbol. */
10092 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
10094 if (child_die->tag == DW_TAG_template_type_param
10095 || child_die->tag == DW_TAG_template_value_param)
10097 templ_func = allocate_template_symbol (objfile);
10098 templ_func->base.is_cplus_template_function = 1;
10103 new = push_context (0, lowpc);
10104 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
10105 (struct symbol *) templ_func);
10107 /* If there is a location expression for DW_AT_frame_base, record
10109 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
10111 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
10113 cu->list_in_scope = &local_symbols;
10115 if (die->child != NULL)
10117 child_die = die->child;
10118 while (child_die && child_die->tag)
10120 if (child_die->tag == DW_TAG_template_type_param
10121 || child_die->tag == DW_TAG_template_value_param)
10123 struct symbol *arg = new_symbol (child_die, NULL, cu);
10126 VEC_safe_push (symbolp, template_args, arg);
10129 process_die (child_die, cu);
10130 child_die = sibling_die (child_die);
10134 inherit_abstract_dies (die, cu);
10136 /* If we have a DW_AT_specification, we might need to import using
10137 directives from the context of the specification DIE. See the
10138 comment in determine_prefix. */
10139 if (cu->language == language_cplus
10140 && dwarf2_attr (die, DW_AT_specification, cu))
10142 struct dwarf2_cu *spec_cu = cu;
10143 struct die_info *spec_die = die_specification (die, &spec_cu);
10147 child_die = spec_die->child;
10148 while (child_die && child_die->tag)
10150 if (child_die->tag == DW_TAG_imported_module)
10151 process_die (child_die, spec_cu);
10152 child_die = sibling_die (child_die);
10155 /* In some cases, GCC generates specification DIEs that
10156 themselves contain DW_AT_specification attributes. */
10157 spec_die = die_specification (spec_die, &spec_cu);
10161 new = pop_context ();
10162 /* Make a block for the local symbols within. */
10163 block = finish_block (new->name, &local_symbols, new->old_blocks,
10164 lowpc, highpc, objfile);
10166 /* For C++, set the block's scope. */
10167 if ((cu->language == language_cplus || cu->language == language_fortran)
10168 && cu->processing_has_namespace_info)
10169 block_set_scope (block, determine_prefix (die, cu),
10170 &objfile->objfile_obstack);
10172 /* If we have address ranges, record them. */
10173 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10175 /* Attach template arguments to function. */
10176 if (! VEC_empty (symbolp, template_args))
10178 gdb_assert (templ_func != NULL);
10180 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
10181 templ_func->template_arguments
10182 = obstack_alloc (&objfile->objfile_obstack,
10183 (templ_func->n_template_arguments
10184 * sizeof (struct symbol *)));
10185 memcpy (templ_func->template_arguments,
10186 VEC_address (symbolp, template_args),
10187 (templ_func->n_template_arguments * sizeof (struct symbol *)));
10188 VEC_free (symbolp, template_args);
10191 /* In C++, we can have functions nested inside functions (e.g., when
10192 a function declares a class that has methods). This means that
10193 when we finish processing a function scope, we may need to go
10194 back to building a containing block's symbol lists. */
10195 local_symbols = new->locals;
10196 using_directives = new->using_directives;
10198 /* If we've finished processing a top-level function, subsequent
10199 symbols go in the file symbol list. */
10200 if (outermost_context_p ())
10201 cu->list_in_scope = &file_symbols;
10204 /* Process all the DIES contained within a lexical block scope. Start
10205 a new scope, process the dies, and then close the scope. */
10208 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
10210 struct objfile *objfile = cu->objfile;
10211 struct context_stack *new;
10212 CORE_ADDR lowpc, highpc;
10213 struct die_info *child_die;
10214 CORE_ADDR baseaddr;
10216 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10218 /* Ignore blocks with missing or invalid low and high pc attributes. */
10219 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
10220 as multiple lexical blocks? Handling children in a sane way would
10221 be nasty. Might be easier to properly extend generic blocks to
10222 describe ranges. */
10223 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10226 highpc += baseaddr;
10228 push_context (0, lowpc);
10229 if (die->child != NULL)
10231 child_die = die->child;
10232 while (child_die && child_die->tag)
10234 process_die (child_die, cu);
10235 child_die = sibling_die (child_die);
10238 new = pop_context ();
10240 if (local_symbols != NULL || using_directives != NULL)
10242 struct block *block
10243 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
10246 /* Note that recording ranges after traversing children, as we
10247 do here, means that recording a parent's ranges entails
10248 walking across all its children's ranges as they appear in
10249 the address map, which is quadratic behavior.
10251 It would be nicer to record the parent's ranges before
10252 traversing its children, simply overriding whatever you find
10253 there. But since we don't even decide whether to create a
10254 block until after we've traversed its children, that's hard
10256 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10258 local_symbols = new->locals;
10259 using_directives = new->using_directives;
10262 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
10265 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
10267 struct objfile *objfile = cu->objfile;
10268 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10269 CORE_ADDR pc, baseaddr;
10270 struct attribute *attr;
10271 struct call_site *call_site, call_site_local;
10274 struct die_info *child_die;
10276 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10278 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10281 complaint (&symfile_complaints,
10282 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
10283 "DIE 0x%x [in module %s]"),
10284 die->offset.sect_off, objfile->name);
10287 pc = DW_ADDR (attr) + baseaddr;
10289 if (cu->call_site_htab == NULL)
10290 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
10291 NULL, &objfile->objfile_obstack,
10292 hashtab_obstack_allocate, NULL);
10293 call_site_local.pc = pc;
10294 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
10297 complaint (&symfile_complaints,
10298 _("Duplicate PC %s for DW_TAG_GNU_call_site "
10299 "DIE 0x%x [in module %s]"),
10300 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
10304 /* Count parameters at the caller. */
10307 for (child_die = die->child; child_die && child_die->tag;
10308 child_die = sibling_die (child_die))
10310 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10312 complaint (&symfile_complaints,
10313 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
10314 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10315 child_die->tag, child_die->offset.sect_off, objfile->name);
10322 call_site = obstack_alloc (&objfile->objfile_obstack,
10323 (sizeof (*call_site)
10324 + (sizeof (*call_site->parameter)
10325 * (nparams - 1))));
10327 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
10328 call_site->pc = pc;
10330 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
10332 struct die_info *func_die;
10334 /* Skip also over DW_TAG_inlined_subroutine. */
10335 for (func_die = die->parent;
10336 func_die && func_die->tag != DW_TAG_subprogram
10337 && func_die->tag != DW_TAG_subroutine_type;
10338 func_die = func_die->parent);
10340 /* DW_AT_GNU_all_call_sites is a superset
10341 of DW_AT_GNU_all_tail_call_sites. */
10343 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
10344 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
10346 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
10347 not complete. But keep CALL_SITE for look ups via call_site_htab,
10348 both the initial caller containing the real return address PC and
10349 the final callee containing the current PC of a chain of tail
10350 calls do not need to have the tail call list complete. But any
10351 function candidate for a virtual tail call frame searched via
10352 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
10353 determined unambiguously. */
10357 struct type *func_type = NULL;
10360 func_type = get_die_type (func_die, cu);
10361 if (func_type != NULL)
10363 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
10365 /* Enlist this call site to the function. */
10366 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
10367 TYPE_TAIL_CALL_LIST (func_type) = call_site;
10370 complaint (&symfile_complaints,
10371 _("Cannot find function owning DW_TAG_GNU_call_site "
10372 "DIE 0x%x [in module %s]"),
10373 die->offset.sect_off, objfile->name);
10377 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
10379 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10380 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
10381 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
10382 /* Keep NULL DWARF_BLOCK. */;
10383 else if (attr_form_is_block (attr))
10385 struct dwarf2_locexpr_baton *dlbaton;
10387 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
10388 dlbaton->data = DW_BLOCK (attr)->data;
10389 dlbaton->size = DW_BLOCK (attr)->size;
10390 dlbaton->per_cu = cu->per_cu;
10392 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
10394 else if (attr_form_is_ref (attr))
10396 struct dwarf2_cu *target_cu = cu;
10397 struct die_info *target_die;
10399 target_die = follow_die_ref (die, attr, &target_cu);
10400 gdb_assert (target_cu->objfile == objfile);
10401 if (die_is_declaration (target_die, target_cu))
10403 const char *target_physname = NULL;
10404 struct attribute *target_attr;
10406 /* Prefer the mangled name; otherwise compute the demangled one. */
10407 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
10408 if (target_attr == NULL)
10409 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
10411 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
10412 target_physname = DW_STRING (target_attr);
10414 target_physname = dwarf2_physname (NULL, target_die, target_cu);
10415 if (target_physname == NULL)
10416 complaint (&symfile_complaints,
10417 _("DW_AT_GNU_call_site_target target DIE has invalid "
10418 "physname, for referencing DIE 0x%x [in module %s]"),
10419 die->offset.sect_off, objfile->name);
10421 SET_FIELD_PHYSNAME (call_site->target, target_physname);
10427 /* DW_AT_entry_pc should be preferred. */
10428 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
10429 complaint (&symfile_complaints,
10430 _("DW_AT_GNU_call_site_target target DIE has invalid "
10431 "low pc, for referencing DIE 0x%x [in module %s]"),
10432 die->offset.sect_off, objfile->name);
10434 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
10438 complaint (&symfile_complaints,
10439 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
10440 "block nor reference, for DIE 0x%x [in module %s]"),
10441 die->offset.sect_off, objfile->name);
10443 call_site->per_cu = cu->per_cu;
10445 for (child_die = die->child;
10446 child_die && child_die->tag;
10447 child_die = sibling_die (child_die))
10449 struct call_site_parameter *parameter;
10450 struct attribute *loc, *origin;
10452 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10454 /* Already printed the complaint above. */
10458 gdb_assert (call_site->parameter_count < nparams);
10459 parameter = &call_site->parameter[call_site->parameter_count];
10461 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10462 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10463 register is contained in DW_AT_GNU_call_site_value. */
10465 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10466 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10467 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
10469 sect_offset offset;
10471 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10472 offset = dwarf2_get_ref_die_offset (origin);
10473 if (!offset_in_cu_p (&cu->header, offset))
10475 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10476 binding can be done only inside one CU. Such referenced DIE
10477 therefore cannot be even moved to DW_TAG_partial_unit. */
10478 complaint (&symfile_complaints,
10479 _("DW_AT_abstract_origin offset is not in CU for "
10480 "DW_TAG_GNU_call_site child DIE 0x%x "
10482 child_die->offset.sect_off, objfile->name);
10485 parameter->u.param_offset.cu_off = (offset.sect_off
10486 - cu->header.offset.sect_off);
10488 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10490 complaint (&symfile_complaints,
10491 _("No DW_FORM_block* DW_AT_location for "
10492 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10493 child_die->offset.sect_off, objfile->name);
10498 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10499 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10500 if (parameter->u.dwarf_reg != -1)
10501 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10502 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10503 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10504 ¶meter->u.fb_offset))
10505 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10508 complaint (&symfile_complaints,
10509 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10510 "for DW_FORM_block* DW_AT_location is supported for "
10511 "DW_TAG_GNU_call_site child DIE 0x%x "
10513 child_die->offset.sect_off, objfile->name);
10518 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10519 if (!attr_form_is_block (attr))
10521 complaint (&symfile_complaints,
10522 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10523 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10524 child_die->offset.sect_off, objfile->name);
10527 parameter->value = DW_BLOCK (attr)->data;
10528 parameter->value_size = DW_BLOCK (attr)->size;
10530 /* Parameters are not pre-cleared by memset above. */
10531 parameter->data_value = NULL;
10532 parameter->data_value_size = 0;
10533 call_site->parameter_count++;
10535 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10538 if (!attr_form_is_block (attr))
10539 complaint (&symfile_complaints,
10540 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10541 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10542 child_die->offset.sect_off, objfile->name);
10545 parameter->data_value = DW_BLOCK (attr)->data;
10546 parameter->data_value_size = DW_BLOCK (attr)->size;
10552 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10553 Return 1 if the attributes are present and valid, otherwise, return 0.
10554 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10557 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10558 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10559 struct partial_symtab *ranges_pst)
10561 struct objfile *objfile = cu->objfile;
10562 struct comp_unit_head *cu_header = &cu->header;
10563 bfd *obfd = objfile->obfd;
10564 unsigned int addr_size = cu_header->addr_size;
10565 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10566 /* Base address selection entry. */
10569 unsigned int dummy;
10570 const gdb_byte *buffer;
10574 CORE_ADDR high = 0;
10575 CORE_ADDR baseaddr;
10577 found_base = cu->base_known;
10578 base = cu->base_address;
10580 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10581 if (offset >= dwarf2_per_objfile->ranges.size)
10583 complaint (&symfile_complaints,
10584 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10588 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10590 /* Read in the largest possible address. */
10591 marker = read_address (obfd, buffer, cu, &dummy);
10592 if ((marker & mask) == mask)
10594 /* If we found the largest possible address, then
10595 read the base address. */
10596 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10597 buffer += 2 * addr_size;
10598 offset += 2 * addr_size;
10604 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10608 CORE_ADDR range_beginning, range_end;
10610 range_beginning = read_address (obfd, buffer, cu, &dummy);
10611 buffer += addr_size;
10612 range_end = read_address (obfd, buffer, cu, &dummy);
10613 buffer += addr_size;
10614 offset += 2 * addr_size;
10616 /* An end of list marker is a pair of zero addresses. */
10617 if (range_beginning == 0 && range_end == 0)
10618 /* Found the end of list entry. */
10621 /* Each base address selection entry is a pair of 2 values.
10622 The first is the largest possible address, the second is
10623 the base address. Check for a base address here. */
10624 if ((range_beginning & mask) == mask)
10626 /* If we found the largest possible address, then
10627 read the base address. */
10628 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10635 /* We have no valid base address for the ranges
10637 complaint (&symfile_complaints,
10638 _("Invalid .debug_ranges data (no base address)"));
10642 if (range_beginning > range_end)
10644 /* Inverted range entries are invalid. */
10645 complaint (&symfile_complaints,
10646 _("Invalid .debug_ranges data (inverted range)"));
10650 /* Empty range entries have no effect. */
10651 if (range_beginning == range_end)
10654 range_beginning += base;
10657 /* A not-uncommon case of bad debug info.
10658 Don't pollute the addrmap with bad data. */
10659 if (range_beginning + baseaddr == 0
10660 && !dwarf2_per_objfile->has_section_at_zero)
10662 complaint (&symfile_complaints,
10663 _(".debug_ranges entry has start address of zero"
10664 " [in module %s]"), objfile->name);
10668 if (ranges_pst != NULL)
10669 addrmap_set_empty (objfile->psymtabs_addrmap,
10670 range_beginning + baseaddr,
10671 range_end - 1 + baseaddr,
10674 /* FIXME: This is recording everything as a low-high
10675 segment of consecutive addresses. We should have a
10676 data structure for discontiguous block ranges
10680 low = range_beginning;
10686 if (range_beginning < low)
10687 low = range_beginning;
10688 if (range_end > high)
10694 /* If the first entry is an end-of-list marker, the range
10695 describes an empty scope, i.e. no instructions. */
10701 *high_return = high;
10705 /* Get low and high pc attributes from a die. Return 1 if the attributes
10706 are present and valid, otherwise, return 0. Return -1 if the range is
10707 discontinuous, i.e. derived from DW_AT_ranges information. */
10710 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10711 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10712 struct partial_symtab *pst)
10714 struct attribute *attr;
10715 struct attribute *attr_high;
10717 CORE_ADDR high = 0;
10720 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10723 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10726 low = DW_ADDR (attr);
10727 if (attr_high->form == DW_FORM_addr
10728 || attr_high->form == DW_FORM_GNU_addr_index)
10729 high = DW_ADDR (attr_high);
10731 high = low + DW_UNSND (attr_high);
10734 /* Found high w/o low attribute. */
10737 /* Found consecutive range of addresses. */
10742 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10745 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10746 We take advantage of the fact that DW_AT_ranges does not appear
10747 in DW_TAG_compile_unit of DWO files. */
10748 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10749 unsigned int ranges_offset = (DW_UNSND (attr)
10750 + (need_ranges_base
10754 /* Value of the DW_AT_ranges attribute is the offset in the
10755 .debug_ranges section. */
10756 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10758 /* Found discontinuous range of addresses. */
10763 /* read_partial_die has also the strict LOW < HIGH requirement. */
10767 /* When using the GNU linker, .gnu.linkonce. sections are used to
10768 eliminate duplicate copies of functions and vtables and such.
10769 The linker will arbitrarily choose one and discard the others.
10770 The AT_*_pc values for such functions refer to local labels in
10771 these sections. If the section from that file was discarded, the
10772 labels are not in the output, so the relocs get a value of 0.
10773 If this is a discarded function, mark the pc bounds as invalid,
10774 so that GDB will ignore it. */
10775 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10784 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10785 its low and high PC addresses. Do nothing if these addresses could not
10786 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10787 and HIGHPC to the high address if greater than HIGHPC. */
10790 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10791 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10792 struct dwarf2_cu *cu)
10794 CORE_ADDR low, high;
10795 struct die_info *child = die->child;
10797 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10799 *lowpc = min (*lowpc, low);
10800 *highpc = max (*highpc, high);
10803 /* If the language does not allow nested subprograms (either inside
10804 subprograms or lexical blocks), we're done. */
10805 if (cu->language != language_ada)
10808 /* Check all the children of the given DIE. If it contains nested
10809 subprograms, then check their pc bounds. Likewise, we need to
10810 check lexical blocks as well, as they may also contain subprogram
10812 while (child && child->tag)
10814 if (child->tag == DW_TAG_subprogram
10815 || child->tag == DW_TAG_lexical_block)
10816 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10817 child = sibling_die (child);
10821 /* Get the low and high pc's represented by the scope DIE, and store
10822 them in *LOWPC and *HIGHPC. If the correct values can't be
10823 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10826 get_scope_pc_bounds (struct die_info *die,
10827 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10828 struct dwarf2_cu *cu)
10830 CORE_ADDR best_low = (CORE_ADDR) -1;
10831 CORE_ADDR best_high = (CORE_ADDR) 0;
10832 CORE_ADDR current_low, current_high;
10834 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10836 best_low = current_low;
10837 best_high = current_high;
10841 struct die_info *child = die->child;
10843 while (child && child->tag)
10845 switch (child->tag) {
10846 case DW_TAG_subprogram:
10847 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10849 case DW_TAG_namespace:
10850 case DW_TAG_module:
10851 /* FIXME: carlton/2004-01-16: Should we do this for
10852 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10853 that current GCC's always emit the DIEs corresponding
10854 to definitions of methods of classes as children of a
10855 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10856 the DIEs giving the declarations, which could be
10857 anywhere). But I don't see any reason why the
10858 standards says that they have to be there. */
10859 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10861 if (current_low != ((CORE_ADDR) -1))
10863 best_low = min (best_low, current_low);
10864 best_high = max (best_high, current_high);
10872 child = sibling_die (child);
10877 *highpc = best_high;
10880 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10884 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10885 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10887 struct objfile *objfile = cu->objfile;
10888 struct attribute *attr;
10889 struct attribute *attr_high;
10891 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10894 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10897 CORE_ADDR low = DW_ADDR (attr);
10899 if (attr_high->form == DW_FORM_addr
10900 || attr_high->form == DW_FORM_GNU_addr_index)
10901 high = DW_ADDR (attr_high);
10903 high = low + DW_UNSND (attr_high);
10905 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10909 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10912 bfd *obfd = objfile->obfd;
10913 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10914 We take advantage of the fact that DW_AT_ranges does not appear
10915 in DW_TAG_compile_unit of DWO files. */
10916 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10918 /* The value of the DW_AT_ranges attribute is the offset of the
10919 address range list in the .debug_ranges section. */
10920 unsigned long offset = (DW_UNSND (attr)
10921 + (need_ranges_base ? cu->ranges_base : 0));
10922 const gdb_byte *buffer;
10924 /* For some target architectures, but not others, the
10925 read_address function sign-extends the addresses it returns.
10926 To recognize base address selection entries, we need a
10928 unsigned int addr_size = cu->header.addr_size;
10929 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10931 /* The base address, to which the next pair is relative. Note
10932 that this 'base' is a DWARF concept: most entries in a range
10933 list are relative, to reduce the number of relocs against the
10934 debugging information. This is separate from this function's
10935 'baseaddr' argument, which GDB uses to relocate debugging
10936 information from a shared library based on the address at
10937 which the library was loaded. */
10938 CORE_ADDR base = cu->base_address;
10939 int base_known = cu->base_known;
10941 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10942 if (offset >= dwarf2_per_objfile->ranges.size)
10944 complaint (&symfile_complaints,
10945 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10949 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10953 unsigned int bytes_read;
10954 CORE_ADDR start, end;
10956 start = read_address (obfd, buffer, cu, &bytes_read);
10957 buffer += bytes_read;
10958 end = read_address (obfd, buffer, cu, &bytes_read);
10959 buffer += bytes_read;
10961 /* Did we find the end of the range list? */
10962 if (start == 0 && end == 0)
10965 /* Did we find a base address selection entry? */
10966 else if ((start & base_select_mask) == base_select_mask)
10972 /* We found an ordinary address range. */
10977 complaint (&symfile_complaints,
10978 _("Invalid .debug_ranges data "
10979 "(no base address)"));
10985 /* Inverted range entries are invalid. */
10986 complaint (&symfile_complaints,
10987 _("Invalid .debug_ranges data "
10988 "(inverted range)"));
10992 /* Empty range entries have no effect. */
10996 start += base + baseaddr;
10997 end += base + baseaddr;
10999 /* A not-uncommon case of bad debug info.
11000 Don't pollute the addrmap with bad data. */
11001 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
11003 complaint (&symfile_complaints,
11004 _(".debug_ranges entry has start address of zero"
11005 " [in module %s]"), objfile->name);
11009 record_block_range (block, start, end - 1);
11015 /* Check whether the producer field indicates either of GCC < 4.6, or the
11016 Intel C/C++ compiler, and cache the result in CU. */
11019 check_producer (struct dwarf2_cu *cu)
11022 int major, minor, release;
11024 if (cu->producer == NULL)
11026 /* For unknown compilers expect their behavior is DWARF version
11029 GCC started to support .debug_types sections by -gdwarf-4 since
11030 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
11031 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
11032 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
11033 interpreted incorrectly by GDB now - GCC PR debug/48229. */
11035 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
11037 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
11039 cs = &cu->producer[strlen ("GNU ")];
11040 while (*cs && !isdigit (*cs))
11042 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
11044 /* Not recognized as GCC. */
11048 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
11049 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
11052 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
11053 cu->producer_is_icc = 1;
11056 /* For other non-GCC compilers, expect their behavior is DWARF version
11060 cu->checked_producer = 1;
11063 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
11064 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
11065 during 4.6.0 experimental. */
11068 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
11070 if (!cu->checked_producer)
11071 check_producer (cu);
11073 return cu->producer_is_gxx_lt_4_6;
11076 /* Return the default accessibility type if it is not overriden by
11077 DW_AT_accessibility. */
11079 static enum dwarf_access_attribute
11080 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
11082 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
11084 /* The default DWARF 2 accessibility for members is public, the default
11085 accessibility for inheritance is private. */
11087 if (die->tag != DW_TAG_inheritance)
11088 return DW_ACCESS_public;
11090 return DW_ACCESS_private;
11094 /* DWARF 3+ defines the default accessibility a different way. The same
11095 rules apply now for DW_TAG_inheritance as for the members and it only
11096 depends on the container kind. */
11098 if (die->parent->tag == DW_TAG_class_type)
11099 return DW_ACCESS_private;
11101 return DW_ACCESS_public;
11105 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
11106 offset. If the attribute was not found return 0, otherwise return
11107 1. If it was found but could not properly be handled, set *OFFSET
11111 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
11114 struct attribute *attr;
11116 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
11121 /* Note that we do not check for a section offset first here.
11122 This is because DW_AT_data_member_location is new in DWARF 4,
11123 so if we see it, we can assume that a constant form is really
11124 a constant and not a section offset. */
11125 if (attr_form_is_constant (attr))
11126 *offset = dwarf2_get_attr_constant_value (attr, 0);
11127 else if (attr_form_is_section_offset (attr))
11128 dwarf2_complex_location_expr_complaint ();
11129 else if (attr_form_is_block (attr))
11130 *offset = decode_locdesc (DW_BLOCK (attr), cu);
11132 dwarf2_complex_location_expr_complaint ();
11140 /* Add an aggregate field to the field list. */
11143 dwarf2_add_field (struct field_info *fip, struct die_info *die,
11144 struct dwarf2_cu *cu)
11146 struct objfile *objfile = cu->objfile;
11147 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11148 struct nextfield *new_field;
11149 struct attribute *attr;
11151 const char *fieldname = "";
11153 /* Allocate a new field list entry and link it in. */
11154 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
11155 make_cleanup (xfree, new_field);
11156 memset (new_field, 0, sizeof (struct nextfield));
11158 if (die->tag == DW_TAG_inheritance)
11160 new_field->next = fip->baseclasses;
11161 fip->baseclasses = new_field;
11165 new_field->next = fip->fields;
11166 fip->fields = new_field;
11170 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11172 new_field->accessibility = DW_UNSND (attr);
11174 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
11175 if (new_field->accessibility != DW_ACCESS_public)
11176 fip->non_public_fields = 1;
11178 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11180 new_field->virtuality = DW_UNSND (attr);
11182 new_field->virtuality = DW_VIRTUALITY_none;
11184 fp = &new_field->field;
11186 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
11190 /* Data member other than a C++ static data member. */
11192 /* Get type of field. */
11193 fp->type = die_type (die, cu);
11195 SET_FIELD_BITPOS (*fp, 0);
11197 /* Get bit size of field (zero if none). */
11198 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
11201 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
11205 FIELD_BITSIZE (*fp) = 0;
11208 /* Get bit offset of field. */
11209 if (handle_data_member_location (die, cu, &offset))
11210 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11211 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
11214 if (gdbarch_bits_big_endian (gdbarch))
11216 /* For big endian bits, the DW_AT_bit_offset gives the
11217 additional bit offset from the MSB of the containing
11218 anonymous object to the MSB of the field. We don't
11219 have to do anything special since we don't need to
11220 know the size of the anonymous object. */
11221 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
11225 /* For little endian bits, compute the bit offset to the
11226 MSB of the anonymous object, subtract off the number of
11227 bits from the MSB of the field to the MSB of the
11228 object, and then subtract off the number of bits of
11229 the field itself. The result is the bit offset of
11230 the LSB of the field. */
11231 int anonymous_size;
11232 int bit_offset = DW_UNSND (attr);
11234 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11237 /* The size of the anonymous object containing
11238 the bit field is explicit, so use the
11239 indicated size (in bytes). */
11240 anonymous_size = DW_UNSND (attr);
11244 /* The size of the anonymous object containing
11245 the bit field must be inferred from the type
11246 attribute of the data member containing the
11248 anonymous_size = TYPE_LENGTH (fp->type);
11250 SET_FIELD_BITPOS (*fp,
11251 (FIELD_BITPOS (*fp)
11252 + anonymous_size * bits_per_byte
11253 - bit_offset - FIELD_BITSIZE (*fp)));
11257 /* Get name of field. */
11258 fieldname = dwarf2_name (die, cu);
11259 if (fieldname == NULL)
11262 /* The name is already allocated along with this objfile, so we don't
11263 need to duplicate it for the type. */
11264 fp->name = fieldname;
11266 /* Change accessibility for artificial fields (e.g. virtual table
11267 pointer or virtual base class pointer) to private. */
11268 if (dwarf2_attr (die, DW_AT_artificial, cu))
11270 FIELD_ARTIFICIAL (*fp) = 1;
11271 new_field->accessibility = DW_ACCESS_private;
11272 fip->non_public_fields = 1;
11275 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
11277 /* C++ static member. */
11279 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
11280 is a declaration, but all versions of G++ as of this writing
11281 (so through at least 3.2.1) incorrectly generate
11282 DW_TAG_variable tags. */
11284 const char *physname;
11286 /* Get name of field. */
11287 fieldname = dwarf2_name (die, cu);
11288 if (fieldname == NULL)
11291 attr = dwarf2_attr (die, DW_AT_const_value, cu);
11293 /* Only create a symbol if this is an external value.
11294 new_symbol checks this and puts the value in the global symbol
11295 table, which we want. If it is not external, new_symbol
11296 will try to put the value in cu->list_in_scope which is wrong. */
11297 && dwarf2_flag_true_p (die, DW_AT_external, cu))
11299 /* A static const member, not much different than an enum as far as
11300 we're concerned, except that we can support more types. */
11301 new_symbol (die, NULL, cu);
11304 /* Get physical name. */
11305 physname = dwarf2_physname (fieldname, die, cu);
11307 /* The name is already allocated along with this objfile, so we don't
11308 need to duplicate it for the type. */
11309 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
11310 FIELD_TYPE (*fp) = die_type (die, cu);
11311 FIELD_NAME (*fp) = fieldname;
11313 else if (die->tag == DW_TAG_inheritance)
11317 /* C++ base class field. */
11318 if (handle_data_member_location (die, cu, &offset))
11319 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11320 FIELD_BITSIZE (*fp) = 0;
11321 FIELD_TYPE (*fp) = die_type (die, cu);
11322 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
11323 fip->nbaseclasses++;
11327 /* Add a typedef defined in the scope of the FIP's class. */
11330 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
11331 struct dwarf2_cu *cu)
11333 struct objfile *objfile = cu->objfile;
11334 struct typedef_field_list *new_field;
11335 struct attribute *attr;
11336 struct typedef_field *fp;
11337 char *fieldname = "";
11339 /* Allocate a new field list entry and link it in. */
11340 new_field = xzalloc (sizeof (*new_field));
11341 make_cleanup (xfree, new_field);
11343 gdb_assert (die->tag == DW_TAG_typedef);
11345 fp = &new_field->field;
11347 /* Get name of field. */
11348 fp->name = dwarf2_name (die, cu);
11349 if (fp->name == NULL)
11352 fp->type = read_type_die (die, cu);
11354 new_field->next = fip->typedef_field_list;
11355 fip->typedef_field_list = new_field;
11356 fip->typedef_field_list_count++;
11359 /* Create the vector of fields, and attach it to the type. */
11362 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
11363 struct dwarf2_cu *cu)
11365 int nfields = fip->nfields;
11367 /* Record the field count, allocate space for the array of fields,
11368 and create blank accessibility bitfields if necessary. */
11369 TYPE_NFIELDS (type) = nfields;
11370 TYPE_FIELDS (type) = (struct field *)
11371 TYPE_ALLOC (type, sizeof (struct field) * nfields);
11372 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
11374 if (fip->non_public_fields && cu->language != language_ada)
11376 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11378 TYPE_FIELD_PRIVATE_BITS (type) =
11379 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11380 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
11382 TYPE_FIELD_PROTECTED_BITS (type) =
11383 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11384 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
11386 TYPE_FIELD_IGNORE_BITS (type) =
11387 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11388 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
11391 /* If the type has baseclasses, allocate and clear a bit vector for
11392 TYPE_FIELD_VIRTUAL_BITS. */
11393 if (fip->nbaseclasses && cu->language != language_ada)
11395 int num_bytes = B_BYTES (fip->nbaseclasses);
11396 unsigned char *pointer;
11398 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11399 pointer = TYPE_ALLOC (type, num_bytes);
11400 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
11401 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
11402 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
11405 /* Copy the saved-up fields into the field vector. Start from the head of
11406 the list, adding to the tail of the field array, so that they end up in
11407 the same order in the array in which they were added to the list. */
11408 while (nfields-- > 0)
11410 struct nextfield *fieldp;
11414 fieldp = fip->fields;
11415 fip->fields = fieldp->next;
11419 fieldp = fip->baseclasses;
11420 fip->baseclasses = fieldp->next;
11423 TYPE_FIELD (type, nfields) = fieldp->field;
11424 switch (fieldp->accessibility)
11426 case DW_ACCESS_private:
11427 if (cu->language != language_ada)
11428 SET_TYPE_FIELD_PRIVATE (type, nfields);
11431 case DW_ACCESS_protected:
11432 if (cu->language != language_ada)
11433 SET_TYPE_FIELD_PROTECTED (type, nfields);
11436 case DW_ACCESS_public:
11440 /* Unknown accessibility. Complain and treat it as public. */
11442 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11443 fieldp->accessibility);
11447 if (nfields < fip->nbaseclasses)
11449 switch (fieldp->virtuality)
11451 case DW_VIRTUALITY_virtual:
11452 case DW_VIRTUALITY_pure_virtual:
11453 if (cu->language == language_ada)
11454 error (_("unexpected virtuality in component of Ada type"));
11455 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11462 /* Return true if this member function is a constructor, false
11466 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11468 const char *fieldname;
11469 const char *typename;
11472 if (die->parent == NULL)
11475 if (die->parent->tag != DW_TAG_structure_type
11476 && die->parent->tag != DW_TAG_union_type
11477 && die->parent->tag != DW_TAG_class_type)
11480 fieldname = dwarf2_name (die, cu);
11481 typename = dwarf2_name (die->parent, cu);
11482 if (fieldname == NULL || typename == NULL)
11485 len = strlen (fieldname);
11486 return (strncmp (fieldname, typename, len) == 0
11487 && (typename[len] == '\0' || typename[len] == '<'));
11490 /* Add a member function to the proper fieldlist. */
11493 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11494 struct type *type, struct dwarf2_cu *cu)
11496 struct objfile *objfile = cu->objfile;
11497 struct attribute *attr;
11498 struct fnfieldlist *flp;
11500 struct fn_field *fnp;
11501 const char *fieldname;
11502 struct nextfnfield *new_fnfield;
11503 struct type *this_type;
11504 enum dwarf_access_attribute accessibility;
11506 if (cu->language == language_ada)
11507 error (_("unexpected member function in Ada type"));
11509 /* Get name of member function. */
11510 fieldname = dwarf2_name (die, cu);
11511 if (fieldname == NULL)
11514 /* Look up member function name in fieldlist. */
11515 for (i = 0; i < fip->nfnfields; i++)
11517 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11521 /* Create new list element if necessary. */
11522 if (i < fip->nfnfields)
11523 flp = &fip->fnfieldlists[i];
11526 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11528 fip->fnfieldlists = (struct fnfieldlist *)
11529 xrealloc (fip->fnfieldlists,
11530 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11531 * sizeof (struct fnfieldlist));
11532 if (fip->nfnfields == 0)
11533 make_cleanup (free_current_contents, &fip->fnfieldlists);
11535 flp = &fip->fnfieldlists[fip->nfnfields];
11536 flp->name = fieldname;
11539 i = fip->nfnfields++;
11542 /* Create a new member function field and chain it to the field list
11544 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11545 make_cleanup (xfree, new_fnfield);
11546 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11547 new_fnfield->next = flp->head;
11548 flp->head = new_fnfield;
11551 /* Fill in the member function field info. */
11552 fnp = &new_fnfield->fnfield;
11554 /* Delay processing of the physname until later. */
11555 if (cu->language == language_cplus || cu->language == language_java)
11557 add_to_method_list (type, i, flp->length - 1, fieldname,
11562 const char *physname = dwarf2_physname (fieldname, die, cu);
11563 fnp->physname = physname ? physname : "";
11566 fnp->type = alloc_type (objfile);
11567 this_type = read_type_die (die, cu);
11568 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11570 int nparams = TYPE_NFIELDS (this_type);
11572 /* TYPE is the domain of this method, and THIS_TYPE is the type
11573 of the method itself (TYPE_CODE_METHOD). */
11574 smash_to_method_type (fnp->type, type,
11575 TYPE_TARGET_TYPE (this_type),
11576 TYPE_FIELDS (this_type),
11577 TYPE_NFIELDS (this_type),
11578 TYPE_VARARGS (this_type));
11580 /* Handle static member functions.
11581 Dwarf2 has no clean way to discern C++ static and non-static
11582 member functions. G++ helps GDB by marking the first
11583 parameter for non-static member functions (which is the this
11584 pointer) as artificial. We obtain this information from
11585 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11586 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11587 fnp->voffset = VOFFSET_STATIC;
11590 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11591 dwarf2_full_name (fieldname, die, cu));
11593 /* Get fcontext from DW_AT_containing_type if present. */
11594 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11595 fnp->fcontext = die_containing_type (die, cu);
11597 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11598 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11600 /* Get accessibility. */
11601 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11603 accessibility = DW_UNSND (attr);
11605 accessibility = dwarf2_default_access_attribute (die, cu);
11606 switch (accessibility)
11608 case DW_ACCESS_private:
11609 fnp->is_private = 1;
11611 case DW_ACCESS_protected:
11612 fnp->is_protected = 1;
11616 /* Check for artificial methods. */
11617 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11618 if (attr && DW_UNSND (attr) != 0)
11619 fnp->is_artificial = 1;
11621 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11623 /* Get index in virtual function table if it is a virtual member
11624 function. For older versions of GCC, this is an offset in the
11625 appropriate virtual table, as specified by DW_AT_containing_type.
11626 For everyone else, it is an expression to be evaluated relative
11627 to the object address. */
11629 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11632 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11634 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11636 /* Old-style GCC. */
11637 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11639 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11640 || (DW_BLOCK (attr)->size > 1
11641 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11642 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11644 struct dwarf_block blk;
11647 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11649 blk.size = DW_BLOCK (attr)->size - offset;
11650 blk.data = DW_BLOCK (attr)->data + offset;
11651 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11652 if ((fnp->voffset % cu->header.addr_size) != 0)
11653 dwarf2_complex_location_expr_complaint ();
11655 fnp->voffset /= cu->header.addr_size;
11659 dwarf2_complex_location_expr_complaint ();
11661 if (!fnp->fcontext)
11662 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11664 else if (attr_form_is_section_offset (attr))
11666 dwarf2_complex_location_expr_complaint ();
11670 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11676 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11677 if (attr && DW_UNSND (attr))
11679 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11680 complaint (&symfile_complaints,
11681 _("Member function \"%s\" (offset %d) is virtual "
11682 "but the vtable offset is not specified"),
11683 fieldname, die->offset.sect_off);
11684 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11685 TYPE_CPLUS_DYNAMIC (type) = 1;
11690 /* Create the vector of member function fields, and attach it to the type. */
11693 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11694 struct dwarf2_cu *cu)
11696 struct fnfieldlist *flp;
11699 if (cu->language == language_ada)
11700 error (_("unexpected member functions in Ada type"));
11702 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11703 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11704 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11706 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11708 struct nextfnfield *nfp = flp->head;
11709 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11712 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11713 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11714 fn_flp->fn_fields = (struct fn_field *)
11715 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11716 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11717 fn_flp->fn_fields[k] = nfp->fnfield;
11720 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11723 /* Returns non-zero if NAME is the name of a vtable member in CU's
11724 language, zero otherwise. */
11726 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11728 static const char vptr[] = "_vptr";
11729 static const char vtable[] = "vtable";
11731 /* Look for the C++ and Java forms of the vtable. */
11732 if ((cu->language == language_java
11733 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11734 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11735 && is_cplus_marker (name[sizeof (vptr) - 1])))
11741 /* GCC outputs unnamed structures that are really pointers to member
11742 functions, with the ABI-specified layout. If TYPE describes
11743 such a structure, smash it into a member function type.
11745 GCC shouldn't do this; it should just output pointer to member DIEs.
11746 This is GCC PR debug/28767. */
11749 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11751 struct type *pfn_type, *domain_type, *new_type;
11753 /* Check for a structure with no name and two children. */
11754 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11757 /* Check for __pfn and __delta members. */
11758 if (TYPE_FIELD_NAME (type, 0) == NULL
11759 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11760 || TYPE_FIELD_NAME (type, 1) == NULL
11761 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11764 /* Find the type of the method. */
11765 pfn_type = TYPE_FIELD_TYPE (type, 0);
11766 if (pfn_type == NULL
11767 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11768 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11771 /* Look for the "this" argument. */
11772 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11773 if (TYPE_NFIELDS (pfn_type) == 0
11774 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11775 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11778 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11779 new_type = alloc_type (objfile);
11780 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11781 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11782 TYPE_VARARGS (pfn_type));
11783 smash_to_methodptr_type (type, new_type);
11786 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11790 producer_is_icc (struct dwarf2_cu *cu)
11792 if (!cu->checked_producer)
11793 check_producer (cu);
11795 return cu->producer_is_icc;
11798 /* Called when we find the DIE that starts a structure or union scope
11799 (definition) to create a type for the structure or union. Fill in
11800 the type's name and general properties; the members will not be
11801 processed until process_structure_scope.
11803 NOTE: we need to call these functions regardless of whether or not the
11804 DIE has a DW_AT_name attribute, since it might be an anonymous
11805 structure or union. This gets the type entered into our set of
11806 user defined types.
11808 However, if the structure is incomplete (an opaque struct/union)
11809 then suppress creating a symbol table entry for it since gdb only
11810 wants to find the one with the complete definition. Note that if
11811 it is complete, we just call new_symbol, which does it's own
11812 checking about whether the struct/union is anonymous or not (and
11813 suppresses creating a symbol table entry itself). */
11815 static struct type *
11816 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11818 struct objfile *objfile = cu->objfile;
11820 struct attribute *attr;
11823 /* If the definition of this type lives in .debug_types, read that type.
11824 Don't follow DW_AT_specification though, that will take us back up
11825 the chain and we want to go down. */
11826 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11829 type = get_DW_AT_signature_type (die, attr, cu);
11831 /* The type's CU may not be the same as CU.
11832 Ensure TYPE is recorded with CU in die_type_hash. */
11833 return set_die_type (die, type, cu);
11836 type = alloc_type (objfile);
11837 INIT_CPLUS_SPECIFIC (type);
11839 name = dwarf2_name (die, cu);
11842 if (cu->language == language_cplus
11843 || cu->language == language_java)
11845 const char *full_name = dwarf2_full_name (name, die, cu);
11847 /* dwarf2_full_name might have already finished building the DIE's
11848 type. If so, there is no need to continue. */
11849 if (get_die_type (die, cu) != NULL)
11850 return get_die_type (die, cu);
11852 TYPE_TAG_NAME (type) = full_name;
11853 if (die->tag == DW_TAG_structure_type
11854 || die->tag == DW_TAG_class_type)
11855 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11859 /* The name is already allocated along with this objfile, so
11860 we don't need to duplicate it for the type. */
11861 TYPE_TAG_NAME (type) = name;
11862 if (die->tag == DW_TAG_class_type)
11863 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11867 if (die->tag == DW_TAG_structure_type)
11869 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11871 else if (die->tag == DW_TAG_union_type)
11873 TYPE_CODE (type) = TYPE_CODE_UNION;
11877 TYPE_CODE (type) = TYPE_CODE_CLASS;
11880 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11881 TYPE_DECLARED_CLASS (type) = 1;
11883 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11886 TYPE_LENGTH (type) = DW_UNSND (attr);
11890 TYPE_LENGTH (type) = 0;
11893 if (producer_is_icc (cu))
11895 /* ICC does not output the required DW_AT_declaration
11896 on incomplete types, but gives them a size of zero. */
11899 TYPE_STUB_SUPPORTED (type) = 1;
11901 if (die_is_declaration (die, cu))
11902 TYPE_STUB (type) = 1;
11903 else if (attr == NULL && die->child == NULL
11904 && producer_is_realview (cu->producer))
11905 /* RealView does not output the required DW_AT_declaration
11906 on incomplete types. */
11907 TYPE_STUB (type) = 1;
11909 /* We need to add the type field to the die immediately so we don't
11910 infinitely recurse when dealing with pointers to the structure
11911 type within the structure itself. */
11912 set_die_type (die, type, cu);
11914 /* set_die_type should be already done. */
11915 set_descriptive_type (type, die, cu);
11920 /* Finish creating a structure or union type, including filling in
11921 its members and creating a symbol for it. */
11924 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11926 struct objfile *objfile = cu->objfile;
11927 struct die_info *child_die = die->child;
11930 type = get_die_type (die, cu);
11932 type = read_structure_type (die, cu);
11934 if (die->child != NULL && ! die_is_declaration (die, cu))
11936 struct field_info fi;
11937 struct die_info *child_die;
11938 VEC (symbolp) *template_args = NULL;
11939 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11941 memset (&fi, 0, sizeof (struct field_info));
11943 child_die = die->child;
11945 while (child_die && child_die->tag)
11947 if (child_die->tag == DW_TAG_member
11948 || child_die->tag == DW_TAG_variable)
11950 /* NOTE: carlton/2002-11-05: A C++ static data member
11951 should be a DW_TAG_member that is a declaration, but
11952 all versions of G++ as of this writing (so through at
11953 least 3.2.1) incorrectly generate DW_TAG_variable
11954 tags for them instead. */
11955 dwarf2_add_field (&fi, child_die, cu);
11957 else if (child_die->tag == DW_TAG_subprogram)
11959 /* C++ member function. */
11960 dwarf2_add_member_fn (&fi, child_die, type, cu);
11962 else if (child_die->tag == DW_TAG_inheritance)
11964 /* C++ base class field. */
11965 dwarf2_add_field (&fi, child_die, cu);
11967 else if (child_die->tag == DW_TAG_typedef)
11968 dwarf2_add_typedef (&fi, child_die, cu);
11969 else if (child_die->tag == DW_TAG_template_type_param
11970 || child_die->tag == DW_TAG_template_value_param)
11972 struct symbol *arg = new_symbol (child_die, NULL, cu);
11975 VEC_safe_push (symbolp, template_args, arg);
11978 child_die = sibling_die (child_die);
11981 /* Attach template arguments to type. */
11982 if (! VEC_empty (symbolp, template_args))
11984 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11985 TYPE_N_TEMPLATE_ARGUMENTS (type)
11986 = VEC_length (symbolp, template_args);
11987 TYPE_TEMPLATE_ARGUMENTS (type)
11988 = obstack_alloc (&objfile->objfile_obstack,
11989 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11990 * sizeof (struct symbol *)));
11991 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11992 VEC_address (symbolp, template_args),
11993 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11994 * sizeof (struct symbol *)));
11995 VEC_free (symbolp, template_args);
11998 /* Attach fields and member functions to the type. */
12000 dwarf2_attach_fields_to_type (&fi, type, cu);
12003 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
12005 /* Get the type which refers to the base class (possibly this
12006 class itself) which contains the vtable pointer for the current
12007 class from the DW_AT_containing_type attribute. This use of
12008 DW_AT_containing_type is a GNU extension. */
12010 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12012 struct type *t = die_containing_type (die, cu);
12014 TYPE_VPTR_BASETYPE (type) = t;
12019 /* Our own class provides vtbl ptr. */
12020 for (i = TYPE_NFIELDS (t) - 1;
12021 i >= TYPE_N_BASECLASSES (t);
12024 const char *fieldname = TYPE_FIELD_NAME (t, i);
12026 if (is_vtable_name (fieldname, cu))
12028 TYPE_VPTR_FIELDNO (type) = i;
12033 /* Complain if virtual function table field not found. */
12034 if (i < TYPE_N_BASECLASSES (t))
12035 complaint (&symfile_complaints,
12036 _("virtual function table pointer "
12037 "not found when defining class '%s'"),
12038 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
12043 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
12046 else if (cu->producer
12047 && strncmp (cu->producer,
12048 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
12050 /* The IBM XLC compiler does not provide direct indication
12051 of the containing type, but the vtable pointer is
12052 always named __vfp. */
12056 for (i = TYPE_NFIELDS (type) - 1;
12057 i >= TYPE_N_BASECLASSES (type);
12060 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
12062 TYPE_VPTR_FIELDNO (type) = i;
12063 TYPE_VPTR_BASETYPE (type) = type;
12070 /* Copy fi.typedef_field_list linked list elements content into the
12071 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
12072 if (fi.typedef_field_list)
12074 int i = fi.typedef_field_list_count;
12076 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12077 TYPE_TYPEDEF_FIELD_ARRAY (type)
12078 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
12079 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
12081 /* Reverse the list order to keep the debug info elements order. */
12084 struct typedef_field *dest, *src;
12086 dest = &TYPE_TYPEDEF_FIELD (type, i);
12087 src = &fi.typedef_field_list->field;
12088 fi.typedef_field_list = fi.typedef_field_list->next;
12093 do_cleanups (back_to);
12095 if (HAVE_CPLUS_STRUCT (type))
12096 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
12099 quirk_gcc_member_function_pointer (type, objfile);
12101 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
12102 snapshots) has been known to create a die giving a declaration
12103 for a class that has, as a child, a die giving a definition for a
12104 nested class. So we have to process our children even if the
12105 current die is a declaration. Normally, of course, a declaration
12106 won't have any children at all. */
12108 while (child_die != NULL && child_die->tag)
12110 if (child_die->tag == DW_TAG_member
12111 || child_die->tag == DW_TAG_variable
12112 || child_die->tag == DW_TAG_inheritance
12113 || child_die->tag == DW_TAG_template_value_param
12114 || child_die->tag == DW_TAG_template_type_param)
12119 process_die (child_die, cu);
12121 child_die = sibling_die (child_die);
12124 /* Do not consider external references. According to the DWARF standard,
12125 these DIEs are identified by the fact that they have no byte_size
12126 attribute, and a declaration attribute. */
12127 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
12128 || !die_is_declaration (die, cu))
12129 new_symbol (die, type, cu);
12132 /* Given a DW_AT_enumeration_type die, set its type. We do not
12133 complete the type's fields yet, or create any symbols. */
12135 static struct type *
12136 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
12138 struct objfile *objfile = cu->objfile;
12140 struct attribute *attr;
12143 /* If the definition of this type lives in .debug_types, read that type.
12144 Don't follow DW_AT_specification though, that will take us back up
12145 the chain and we want to go down. */
12146 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12149 type = get_DW_AT_signature_type (die, attr, cu);
12151 /* The type's CU may not be the same as CU.
12152 Ensure TYPE is recorded with CU in die_type_hash. */
12153 return set_die_type (die, type, cu);
12156 type = alloc_type (objfile);
12158 TYPE_CODE (type) = TYPE_CODE_ENUM;
12159 name = dwarf2_full_name (NULL, die, cu);
12161 TYPE_TAG_NAME (type) = name;
12163 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12166 TYPE_LENGTH (type) = DW_UNSND (attr);
12170 TYPE_LENGTH (type) = 0;
12173 /* The enumeration DIE can be incomplete. In Ada, any type can be
12174 declared as private in the package spec, and then defined only
12175 inside the package body. Such types are known as Taft Amendment
12176 Types. When another package uses such a type, an incomplete DIE
12177 may be generated by the compiler. */
12178 if (die_is_declaration (die, cu))
12179 TYPE_STUB (type) = 1;
12181 return set_die_type (die, type, cu);
12184 /* Given a pointer to a die which begins an enumeration, process all
12185 the dies that define the members of the enumeration, and create the
12186 symbol for the enumeration type.
12188 NOTE: We reverse the order of the element list. */
12191 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
12193 struct type *this_type;
12195 this_type = get_die_type (die, cu);
12196 if (this_type == NULL)
12197 this_type = read_enumeration_type (die, cu);
12199 if (die->child != NULL)
12201 struct die_info *child_die;
12202 struct symbol *sym;
12203 struct field *fields = NULL;
12204 int num_fields = 0;
12205 int unsigned_enum = 1;
12210 child_die = die->child;
12211 while (child_die && child_die->tag)
12213 if (child_die->tag != DW_TAG_enumerator)
12215 process_die (child_die, cu);
12219 name = dwarf2_name (child_die, cu);
12222 sym = new_symbol (child_die, this_type, cu);
12223 if (SYMBOL_VALUE (sym) < 0)
12228 else if ((mask & SYMBOL_VALUE (sym)) != 0)
12231 mask |= SYMBOL_VALUE (sym);
12233 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
12235 fields = (struct field *)
12237 (num_fields + DW_FIELD_ALLOC_CHUNK)
12238 * sizeof (struct field));
12241 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
12242 FIELD_TYPE (fields[num_fields]) = NULL;
12243 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
12244 FIELD_BITSIZE (fields[num_fields]) = 0;
12250 child_die = sibling_die (child_die);
12255 TYPE_NFIELDS (this_type) = num_fields;
12256 TYPE_FIELDS (this_type) = (struct field *)
12257 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
12258 memcpy (TYPE_FIELDS (this_type), fields,
12259 sizeof (struct field) * num_fields);
12263 TYPE_UNSIGNED (this_type) = 1;
12265 TYPE_FLAG_ENUM (this_type) = 1;
12268 /* If we are reading an enum from a .debug_types unit, and the enum
12269 is a declaration, and the enum is not the signatured type in the
12270 unit, then we do not want to add a symbol for it. Adding a
12271 symbol would in some cases obscure the true definition of the
12272 enum, giving users an incomplete type when the definition is
12273 actually available. Note that we do not want to do this for all
12274 enums which are just declarations, because C++0x allows forward
12275 enum declarations. */
12276 if (cu->per_cu->is_debug_types
12277 && die_is_declaration (die, cu))
12279 struct signatured_type *sig_type;
12281 sig_type = (struct signatured_type *) cu->per_cu;
12282 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
12283 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
12287 new_symbol (die, this_type, cu);
12290 /* Extract all information from a DW_TAG_array_type DIE and put it in
12291 the DIE's type field. For now, this only handles one dimensional
12294 static struct type *
12295 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
12297 struct objfile *objfile = cu->objfile;
12298 struct die_info *child_die;
12300 struct type *element_type, *range_type, *index_type;
12301 struct type **range_types = NULL;
12302 struct attribute *attr;
12304 struct cleanup *back_to;
12307 element_type = die_type (die, cu);
12309 /* The die_type call above may have already set the type for this DIE. */
12310 type = get_die_type (die, cu);
12314 /* Irix 6.2 native cc creates array types without children for
12315 arrays with unspecified length. */
12316 if (die->child == NULL)
12318 index_type = objfile_type (objfile)->builtin_int;
12319 range_type = create_range_type (NULL, index_type, 0, -1);
12320 type = create_array_type (NULL, element_type, range_type);
12321 return set_die_type (die, type, cu);
12324 back_to = make_cleanup (null_cleanup, NULL);
12325 child_die = die->child;
12326 while (child_die && child_die->tag)
12328 if (child_die->tag == DW_TAG_subrange_type)
12330 struct type *child_type = read_type_die (child_die, cu);
12332 if (child_type != NULL)
12334 /* The range type was succesfully read. Save it for the
12335 array type creation. */
12336 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
12338 range_types = (struct type **)
12339 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
12340 * sizeof (struct type *));
12342 make_cleanup (free_current_contents, &range_types);
12344 range_types[ndim++] = child_type;
12347 child_die = sibling_die (child_die);
12350 /* Dwarf2 dimensions are output from left to right, create the
12351 necessary array types in backwards order. */
12353 type = element_type;
12355 if (read_array_order (die, cu) == DW_ORD_col_major)
12360 type = create_array_type (NULL, type, range_types[i++]);
12365 type = create_array_type (NULL, type, range_types[ndim]);
12368 /* Understand Dwarf2 support for vector types (like they occur on
12369 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
12370 array type. This is not part of the Dwarf2/3 standard yet, but a
12371 custom vendor extension. The main difference between a regular
12372 array and the vector variant is that vectors are passed by value
12374 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
12376 make_vector_type (type);
12378 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
12379 implementation may choose to implement triple vectors using this
12381 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12384 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
12385 TYPE_LENGTH (type) = DW_UNSND (attr);
12387 complaint (&symfile_complaints,
12388 _("DW_AT_byte_size for array type smaller "
12389 "than the total size of elements"));
12392 name = dwarf2_name (die, cu);
12394 TYPE_NAME (type) = name;
12396 /* Install the type in the die. */
12397 set_die_type (die, type, cu);
12399 /* set_die_type should be already done. */
12400 set_descriptive_type (type, die, cu);
12402 do_cleanups (back_to);
12407 static enum dwarf_array_dim_ordering
12408 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
12410 struct attribute *attr;
12412 attr = dwarf2_attr (die, DW_AT_ordering, cu);
12414 if (attr) return DW_SND (attr);
12416 /* GNU F77 is a special case, as at 08/2004 array type info is the
12417 opposite order to the dwarf2 specification, but data is still
12418 laid out as per normal fortran.
12420 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
12421 version checking. */
12423 if (cu->language == language_fortran
12424 && cu->producer && strstr (cu->producer, "GNU F77"))
12426 return DW_ORD_row_major;
12429 switch (cu->language_defn->la_array_ordering)
12431 case array_column_major:
12432 return DW_ORD_col_major;
12433 case array_row_major:
12435 return DW_ORD_row_major;
12439 /* Extract all information from a DW_TAG_set_type DIE and put it in
12440 the DIE's type field. */
12442 static struct type *
12443 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12445 struct type *domain_type, *set_type;
12446 struct attribute *attr;
12448 domain_type = die_type (die, cu);
12450 /* The die_type call above may have already set the type for this DIE. */
12451 set_type = get_die_type (die, cu);
12455 set_type = create_set_type (NULL, domain_type);
12457 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12459 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12461 return set_die_type (die, set_type, cu);
12464 /* A helper for read_common_block that creates a locexpr baton.
12465 SYM is the symbol which we are marking as computed.
12466 COMMON_DIE is the DIE for the common block.
12467 COMMON_LOC is the location expression attribute for the common
12469 MEMBER_LOC is the location expression attribute for the particular
12470 member of the common block that we are processing.
12471 CU is the CU from which the above come. */
12474 mark_common_block_symbol_computed (struct symbol *sym,
12475 struct die_info *common_die,
12476 struct attribute *common_loc,
12477 struct attribute *member_loc,
12478 struct dwarf2_cu *cu)
12480 struct objfile *objfile = dwarf2_per_objfile->objfile;
12481 struct dwarf2_locexpr_baton *baton;
12483 unsigned int cu_off;
12484 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12485 LONGEST offset = 0;
12487 gdb_assert (common_loc && member_loc);
12488 gdb_assert (attr_form_is_block (common_loc));
12489 gdb_assert (attr_form_is_block (member_loc)
12490 || attr_form_is_constant (member_loc));
12492 baton = obstack_alloc (&objfile->objfile_obstack,
12493 sizeof (struct dwarf2_locexpr_baton));
12494 baton->per_cu = cu->per_cu;
12495 gdb_assert (baton->per_cu);
12497 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12499 if (attr_form_is_constant (member_loc))
12501 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12502 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12505 baton->size += DW_BLOCK (member_loc)->size;
12507 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12510 *ptr++ = DW_OP_call4;
12511 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12512 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12515 if (attr_form_is_constant (member_loc))
12517 *ptr++ = DW_OP_addr;
12518 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12519 ptr += cu->header.addr_size;
12523 /* We have to copy the data here, because DW_OP_call4 will only
12524 use a DW_AT_location attribute. */
12525 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12526 ptr += DW_BLOCK (member_loc)->size;
12529 *ptr++ = DW_OP_plus;
12530 gdb_assert (ptr - baton->data == baton->size);
12532 SYMBOL_LOCATION_BATON (sym) = baton;
12533 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12536 /* Create appropriate locally-scoped variables for all the
12537 DW_TAG_common_block entries. Also create a struct common_block
12538 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12539 is used to sepate the common blocks name namespace from regular
12543 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12545 struct attribute *attr;
12547 attr = dwarf2_attr (die, DW_AT_location, cu);
12550 /* Support the .debug_loc offsets. */
12551 if (attr_form_is_block (attr))
12555 else if (attr_form_is_section_offset (attr))
12557 dwarf2_complex_location_expr_complaint ();
12562 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12563 "common block member");
12568 if (die->child != NULL)
12570 struct objfile *objfile = cu->objfile;
12571 struct die_info *child_die;
12572 size_t n_entries = 0, size;
12573 struct common_block *common_block;
12574 struct symbol *sym;
12576 for (child_die = die->child;
12577 child_die && child_die->tag;
12578 child_die = sibling_die (child_die))
12581 size = (sizeof (struct common_block)
12582 + (n_entries - 1) * sizeof (struct symbol *));
12583 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12584 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12585 common_block->n_entries = 0;
12587 for (child_die = die->child;
12588 child_die && child_die->tag;
12589 child_die = sibling_die (child_die))
12591 /* Create the symbol in the DW_TAG_common_block block in the current
12593 sym = new_symbol (child_die, NULL, cu);
12596 struct attribute *member_loc;
12598 common_block->contents[common_block->n_entries++] = sym;
12600 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12604 /* GDB has handled this for a long time, but it is
12605 not specified by DWARF. It seems to have been
12606 emitted by gfortran at least as recently as:
12607 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12608 complaint (&symfile_complaints,
12609 _("Variable in common block has "
12610 "DW_AT_data_member_location "
12611 "- DIE at 0x%x [in module %s]"),
12612 child_die->offset.sect_off, cu->objfile->name);
12614 if (attr_form_is_section_offset (member_loc))
12615 dwarf2_complex_location_expr_complaint ();
12616 else if (attr_form_is_constant (member_loc)
12617 || attr_form_is_block (member_loc))
12620 mark_common_block_symbol_computed (sym, die, attr,
12624 dwarf2_complex_location_expr_complaint ();
12629 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12630 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12634 /* Create a type for a C++ namespace. */
12636 static struct type *
12637 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12639 struct objfile *objfile = cu->objfile;
12640 const char *previous_prefix, *name;
12644 /* For extensions, reuse the type of the original namespace. */
12645 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12647 struct die_info *ext_die;
12648 struct dwarf2_cu *ext_cu = cu;
12650 ext_die = dwarf2_extension (die, &ext_cu);
12651 type = read_type_die (ext_die, ext_cu);
12653 /* EXT_CU may not be the same as CU.
12654 Ensure TYPE is recorded with CU in die_type_hash. */
12655 return set_die_type (die, type, cu);
12658 name = namespace_name (die, &is_anonymous, cu);
12660 /* Now build the name of the current namespace. */
12662 previous_prefix = determine_prefix (die, cu);
12663 if (previous_prefix[0] != '\0')
12664 name = typename_concat (&objfile->objfile_obstack,
12665 previous_prefix, name, 0, cu);
12667 /* Create the type. */
12668 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12670 TYPE_NAME (type) = name;
12671 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12673 return set_die_type (die, type, cu);
12676 /* Read a C++ namespace. */
12679 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12681 struct objfile *objfile = cu->objfile;
12684 /* Add a symbol associated to this if we haven't seen the namespace
12685 before. Also, add a using directive if it's an anonymous
12688 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12692 type = read_type_die (die, cu);
12693 new_symbol (die, type, cu);
12695 namespace_name (die, &is_anonymous, cu);
12698 const char *previous_prefix = determine_prefix (die, cu);
12700 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12701 NULL, NULL, 0, &objfile->objfile_obstack);
12705 if (die->child != NULL)
12707 struct die_info *child_die = die->child;
12709 while (child_die && child_die->tag)
12711 process_die (child_die, cu);
12712 child_die = sibling_die (child_die);
12717 /* Read a Fortran module as type. This DIE can be only a declaration used for
12718 imported module. Still we need that type as local Fortran "use ... only"
12719 declaration imports depend on the created type in determine_prefix. */
12721 static struct type *
12722 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12724 struct objfile *objfile = cu->objfile;
12725 const char *module_name;
12728 module_name = dwarf2_name (die, cu);
12730 complaint (&symfile_complaints,
12731 _("DW_TAG_module has no name, offset 0x%x"),
12732 die->offset.sect_off);
12733 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12735 /* determine_prefix uses TYPE_TAG_NAME. */
12736 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12738 return set_die_type (die, type, cu);
12741 /* Read a Fortran module. */
12744 read_module (struct die_info *die, struct dwarf2_cu *cu)
12746 struct die_info *child_die = die->child;
12748 while (child_die && child_die->tag)
12750 process_die (child_die, cu);
12751 child_die = sibling_die (child_die);
12755 /* Return the name of the namespace represented by DIE. Set
12756 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12759 static const char *
12760 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12762 struct die_info *current_die;
12763 const char *name = NULL;
12765 /* Loop through the extensions until we find a name. */
12767 for (current_die = die;
12768 current_die != NULL;
12769 current_die = dwarf2_extension (die, &cu))
12771 name = dwarf2_name (current_die, cu);
12776 /* Is it an anonymous namespace? */
12778 *is_anonymous = (name == NULL);
12780 name = CP_ANONYMOUS_NAMESPACE_STR;
12785 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12786 the user defined type vector. */
12788 static struct type *
12789 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12791 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12792 struct comp_unit_head *cu_header = &cu->header;
12794 struct attribute *attr_byte_size;
12795 struct attribute *attr_address_class;
12796 int byte_size, addr_class;
12797 struct type *target_type;
12799 target_type = die_type (die, cu);
12801 /* The die_type call above may have already set the type for this DIE. */
12802 type = get_die_type (die, cu);
12806 type = lookup_pointer_type (target_type);
12808 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12809 if (attr_byte_size)
12810 byte_size = DW_UNSND (attr_byte_size);
12812 byte_size = cu_header->addr_size;
12814 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12815 if (attr_address_class)
12816 addr_class = DW_UNSND (attr_address_class);
12818 addr_class = DW_ADDR_none;
12820 /* If the pointer size or address class is different than the
12821 default, create a type variant marked as such and set the
12822 length accordingly. */
12823 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12825 if (gdbarch_address_class_type_flags_p (gdbarch))
12829 type_flags = gdbarch_address_class_type_flags
12830 (gdbarch, byte_size, addr_class);
12831 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12833 type = make_type_with_address_space (type, type_flags);
12835 else if (TYPE_LENGTH (type) != byte_size)
12837 complaint (&symfile_complaints,
12838 _("invalid pointer size %d"), byte_size);
12842 /* Should we also complain about unhandled address classes? */
12846 TYPE_LENGTH (type) = byte_size;
12847 return set_die_type (die, type, cu);
12850 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12851 the user defined type vector. */
12853 static struct type *
12854 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12857 struct type *to_type;
12858 struct type *domain;
12860 to_type = die_type (die, cu);
12861 domain = die_containing_type (die, cu);
12863 /* The calls above may have already set the type for this DIE. */
12864 type = get_die_type (die, cu);
12868 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12869 type = lookup_methodptr_type (to_type);
12870 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12872 struct type *new_type = alloc_type (cu->objfile);
12874 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12875 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12876 TYPE_VARARGS (to_type));
12877 type = lookup_methodptr_type (new_type);
12880 type = lookup_memberptr_type (to_type, domain);
12882 return set_die_type (die, type, cu);
12885 /* Extract all information from a DW_TAG_reference_type DIE and add to
12886 the user defined type vector. */
12888 static struct type *
12889 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12891 struct comp_unit_head *cu_header = &cu->header;
12892 struct type *type, *target_type;
12893 struct attribute *attr;
12895 target_type = die_type (die, cu);
12897 /* The die_type call above may have already set the type for this DIE. */
12898 type = get_die_type (die, cu);
12902 type = lookup_reference_type (target_type);
12903 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12906 TYPE_LENGTH (type) = DW_UNSND (attr);
12910 TYPE_LENGTH (type) = cu_header->addr_size;
12912 return set_die_type (die, type, cu);
12915 static struct type *
12916 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12918 struct type *base_type, *cv_type;
12920 base_type = die_type (die, cu);
12922 /* The die_type call above may have already set the type for this DIE. */
12923 cv_type = get_die_type (die, cu);
12927 /* In case the const qualifier is applied to an array type, the element type
12928 is so qualified, not the array type (section 6.7.3 of C99). */
12929 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12931 struct type *el_type, *inner_array;
12933 base_type = copy_type (base_type);
12934 inner_array = base_type;
12936 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12938 TYPE_TARGET_TYPE (inner_array) =
12939 copy_type (TYPE_TARGET_TYPE (inner_array));
12940 inner_array = TYPE_TARGET_TYPE (inner_array);
12943 el_type = TYPE_TARGET_TYPE (inner_array);
12944 TYPE_TARGET_TYPE (inner_array) =
12945 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12947 return set_die_type (die, base_type, cu);
12950 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12951 return set_die_type (die, cv_type, cu);
12954 static struct type *
12955 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12957 struct type *base_type, *cv_type;
12959 base_type = die_type (die, cu);
12961 /* The die_type call above may have already set the type for this DIE. */
12962 cv_type = get_die_type (die, cu);
12966 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12967 return set_die_type (die, cv_type, cu);
12970 /* Handle DW_TAG_restrict_type. */
12972 static struct type *
12973 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12975 struct type *base_type, *cv_type;
12977 base_type = die_type (die, cu);
12979 /* The die_type call above may have already set the type for this DIE. */
12980 cv_type = get_die_type (die, cu);
12984 cv_type = make_restrict_type (base_type);
12985 return set_die_type (die, cv_type, cu);
12988 /* Extract all information from a DW_TAG_string_type DIE and add to
12989 the user defined type vector. It isn't really a user defined type,
12990 but it behaves like one, with other DIE's using an AT_user_def_type
12991 attribute to reference it. */
12993 static struct type *
12994 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12996 struct objfile *objfile = cu->objfile;
12997 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12998 struct type *type, *range_type, *index_type, *char_type;
12999 struct attribute *attr;
13000 unsigned int length;
13002 attr = dwarf2_attr (die, DW_AT_string_length, cu);
13005 length = DW_UNSND (attr);
13009 /* Check for the DW_AT_byte_size attribute. */
13010 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13013 length = DW_UNSND (attr);
13021 index_type = objfile_type (objfile)->builtin_int;
13022 range_type = create_range_type (NULL, index_type, 1, length);
13023 char_type = language_string_char_type (cu->language_defn, gdbarch);
13024 type = create_string_type (NULL, char_type, range_type);
13026 return set_die_type (die, type, cu);
13029 /* Assuming that DIE corresponds to a function, returns nonzero
13030 if the function is prototyped. */
13033 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
13035 struct attribute *attr;
13037 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
13038 if (attr && (DW_UNSND (attr) != 0))
13041 /* The DWARF standard implies that the DW_AT_prototyped attribute
13042 is only meaninful for C, but the concept also extends to other
13043 languages that allow unprototyped functions (Eg: Objective C).
13044 For all other languages, assume that functions are always
13046 if (cu->language != language_c
13047 && cu->language != language_objc
13048 && cu->language != language_opencl)
13051 /* RealView does not emit DW_AT_prototyped. We can not distinguish
13052 prototyped and unprototyped functions; default to prototyped,
13053 since that is more common in modern code (and RealView warns
13054 about unprototyped functions). */
13055 if (producer_is_realview (cu->producer))
13061 /* Handle DIES due to C code like:
13065 int (*funcp)(int a, long l);
13069 ('funcp' generates a DW_TAG_subroutine_type DIE). */
13071 static struct type *
13072 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
13074 struct objfile *objfile = cu->objfile;
13075 struct type *type; /* Type that this function returns. */
13076 struct type *ftype; /* Function that returns above type. */
13077 struct attribute *attr;
13079 type = die_type (die, cu);
13081 /* The die_type call above may have already set the type for this DIE. */
13082 ftype = get_die_type (die, cu);
13086 ftype = lookup_function_type (type);
13088 if (prototyped_function_p (die, cu))
13089 TYPE_PROTOTYPED (ftype) = 1;
13091 /* Store the calling convention in the type if it's available in
13092 the subroutine die. Otherwise set the calling convention to
13093 the default value DW_CC_normal. */
13094 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
13096 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
13097 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
13098 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
13100 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
13102 /* We need to add the subroutine type to the die immediately so
13103 we don't infinitely recurse when dealing with parameters
13104 declared as the same subroutine type. */
13105 set_die_type (die, ftype, cu);
13107 if (die->child != NULL)
13109 struct type *void_type = objfile_type (objfile)->builtin_void;
13110 struct die_info *child_die;
13111 int nparams, iparams;
13113 /* Count the number of parameters.
13114 FIXME: GDB currently ignores vararg functions, but knows about
13115 vararg member functions. */
13117 child_die = die->child;
13118 while (child_die && child_die->tag)
13120 if (child_die->tag == DW_TAG_formal_parameter)
13122 else if (child_die->tag == DW_TAG_unspecified_parameters)
13123 TYPE_VARARGS (ftype) = 1;
13124 child_die = sibling_die (child_die);
13127 /* Allocate storage for parameters and fill them in. */
13128 TYPE_NFIELDS (ftype) = nparams;
13129 TYPE_FIELDS (ftype) = (struct field *)
13130 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
13132 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
13133 even if we error out during the parameters reading below. */
13134 for (iparams = 0; iparams < nparams; iparams++)
13135 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
13138 child_die = die->child;
13139 while (child_die && child_die->tag)
13141 if (child_die->tag == DW_TAG_formal_parameter)
13143 struct type *arg_type;
13145 /* DWARF version 2 has no clean way to discern C++
13146 static and non-static member functions. G++ helps
13147 GDB by marking the first parameter for non-static
13148 member functions (which is the this pointer) as
13149 artificial. We pass this information to
13150 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
13152 DWARF version 3 added DW_AT_object_pointer, which GCC
13153 4.5 does not yet generate. */
13154 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
13156 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
13159 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
13161 /* GCC/43521: In java, the formal parameter
13162 "this" is sometimes not marked with DW_AT_artificial. */
13163 if (cu->language == language_java)
13165 const char *name = dwarf2_name (child_die, cu);
13167 if (name && !strcmp (name, "this"))
13168 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
13171 arg_type = die_type (child_die, cu);
13173 /* RealView does not mark THIS as const, which the testsuite
13174 expects. GCC marks THIS as const in method definitions,
13175 but not in the class specifications (GCC PR 43053). */
13176 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
13177 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
13180 struct dwarf2_cu *arg_cu = cu;
13181 const char *name = dwarf2_name (child_die, cu);
13183 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
13186 /* If the compiler emits this, use it. */
13187 if (follow_die_ref (die, attr, &arg_cu) == child_die)
13190 else if (name && strcmp (name, "this") == 0)
13191 /* Function definitions will have the argument names. */
13193 else if (name == NULL && iparams == 0)
13194 /* Declarations may not have the names, so like
13195 elsewhere in GDB, assume an artificial first
13196 argument is "this". */
13200 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
13204 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
13207 child_die = sibling_die (child_die);
13214 static struct type *
13215 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
13217 struct objfile *objfile = cu->objfile;
13218 const char *name = NULL;
13219 struct type *this_type, *target_type;
13221 name = dwarf2_full_name (NULL, die, cu);
13222 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
13223 TYPE_FLAG_TARGET_STUB, NULL, objfile);
13224 TYPE_NAME (this_type) = name;
13225 set_die_type (die, this_type, cu);
13226 target_type = die_type (die, cu);
13227 if (target_type != this_type)
13228 TYPE_TARGET_TYPE (this_type) = target_type;
13231 /* Self-referential typedefs are, it seems, not allowed by the DWARF
13232 spec and cause infinite loops in GDB. */
13233 complaint (&symfile_complaints,
13234 _("Self-referential DW_TAG_typedef "
13235 "- DIE at 0x%x [in module %s]"),
13236 die->offset.sect_off, objfile->name);
13237 TYPE_TARGET_TYPE (this_type) = NULL;
13242 /* Find a representation of a given base type and install
13243 it in the TYPE field of the die. */
13245 static struct type *
13246 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
13248 struct objfile *objfile = cu->objfile;
13250 struct attribute *attr;
13251 int encoding = 0, size = 0;
13253 enum type_code code = TYPE_CODE_INT;
13254 int type_flags = 0;
13255 struct type *target_type = NULL;
13257 attr = dwarf2_attr (die, DW_AT_encoding, cu);
13260 encoding = DW_UNSND (attr);
13262 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13265 size = DW_UNSND (attr);
13267 name = dwarf2_name (die, cu);
13270 complaint (&symfile_complaints,
13271 _("DW_AT_name missing from DW_TAG_base_type"));
13276 case DW_ATE_address:
13277 /* Turn DW_ATE_address into a void * pointer. */
13278 code = TYPE_CODE_PTR;
13279 type_flags |= TYPE_FLAG_UNSIGNED;
13280 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
13282 case DW_ATE_boolean:
13283 code = TYPE_CODE_BOOL;
13284 type_flags |= TYPE_FLAG_UNSIGNED;
13286 case DW_ATE_complex_float:
13287 code = TYPE_CODE_COMPLEX;
13288 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
13290 case DW_ATE_decimal_float:
13291 code = TYPE_CODE_DECFLOAT;
13294 code = TYPE_CODE_FLT;
13296 case DW_ATE_signed:
13298 case DW_ATE_unsigned:
13299 type_flags |= TYPE_FLAG_UNSIGNED;
13300 if (cu->language == language_fortran
13302 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
13303 code = TYPE_CODE_CHAR;
13305 case DW_ATE_signed_char:
13306 if (cu->language == language_ada || cu->language == language_m2
13307 || cu->language == language_pascal
13308 || cu->language == language_fortran)
13309 code = TYPE_CODE_CHAR;
13311 case DW_ATE_unsigned_char:
13312 if (cu->language == language_ada || cu->language == language_m2
13313 || cu->language == language_pascal
13314 || cu->language == language_fortran)
13315 code = TYPE_CODE_CHAR;
13316 type_flags |= TYPE_FLAG_UNSIGNED;
13319 /* We just treat this as an integer and then recognize the
13320 type by name elsewhere. */
13324 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
13325 dwarf_type_encoding_name (encoding));
13329 type = init_type (code, size, type_flags, NULL, objfile);
13330 TYPE_NAME (type) = name;
13331 TYPE_TARGET_TYPE (type) = target_type;
13333 if (name && strcmp (name, "char") == 0)
13334 TYPE_NOSIGN (type) = 1;
13336 return set_die_type (die, type, cu);
13339 /* Read the given DW_AT_subrange DIE. */
13341 static struct type *
13342 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
13344 struct type *base_type, *orig_base_type;
13345 struct type *range_type;
13346 struct attribute *attr;
13348 int low_default_is_valid;
13350 LONGEST negative_mask;
13352 orig_base_type = die_type (die, cu);
13353 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
13354 whereas the real type might be. So, we use ORIG_BASE_TYPE when
13355 creating the range type, but we use the result of check_typedef
13356 when examining properties of the type. */
13357 base_type = check_typedef (orig_base_type);
13359 /* The die_type call above may have already set the type for this DIE. */
13360 range_type = get_die_type (die, cu);
13364 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
13365 omitting DW_AT_lower_bound. */
13366 switch (cu->language)
13369 case language_cplus:
13371 low_default_is_valid = 1;
13373 case language_fortran:
13375 low_default_is_valid = 1;
13378 case language_java:
13379 case language_objc:
13381 low_default_is_valid = (cu->header.version >= 4);
13385 case language_pascal:
13387 low_default_is_valid = (cu->header.version >= 4);
13391 low_default_is_valid = 0;
13395 /* FIXME: For variable sized arrays either of these could be
13396 a variable rather than a constant value. We'll allow it,
13397 but we don't know how to handle it. */
13398 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
13400 low = dwarf2_get_attr_constant_value (attr, low);
13401 else if (!low_default_is_valid)
13402 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
13403 "- DIE at 0x%x [in module %s]"),
13404 die->offset.sect_off, cu->objfile->name);
13406 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
13409 if (attr_form_is_block (attr) || attr_form_is_ref (attr))
13411 /* GCC encodes arrays with unspecified or dynamic length
13412 with a DW_FORM_block1 attribute or a reference attribute.
13413 FIXME: GDB does not yet know how to handle dynamic
13414 arrays properly, treat them as arrays with unspecified
13417 FIXME: jimb/2003-09-22: GDB does not really know
13418 how to handle arrays of unspecified length
13419 either; we just represent them as zero-length
13420 arrays. Choose an appropriate upper bound given
13421 the lower bound we've computed above. */
13425 high = dwarf2_get_attr_constant_value (attr, 1);
13429 attr = dwarf2_attr (die, DW_AT_count, cu);
13432 int count = dwarf2_get_attr_constant_value (attr, 1);
13433 high = low + count - 1;
13437 /* Unspecified array length. */
13442 /* Dwarf-2 specifications explicitly allows to create subrange types
13443 without specifying a base type.
13444 In that case, the base type must be set to the type of
13445 the lower bound, upper bound or count, in that order, if any of these
13446 three attributes references an object that has a type.
13447 If no base type is found, the Dwarf-2 specifications say that
13448 a signed integer type of size equal to the size of an address should
13450 For the following C code: `extern char gdb_int [];'
13451 GCC produces an empty range DIE.
13452 FIXME: muller/2010-05-28: Possible references to object for low bound,
13453 high bound or count are not yet handled by this code. */
13454 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
13456 struct objfile *objfile = cu->objfile;
13457 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13458 int addr_size = gdbarch_addr_bit (gdbarch) /8;
13459 struct type *int_type = objfile_type (objfile)->builtin_int;
13461 /* Test "int", "long int", and "long long int" objfile types,
13462 and select the first one having a size above or equal to the
13463 architecture address size. */
13464 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13465 base_type = int_type;
13468 int_type = objfile_type (objfile)->builtin_long;
13469 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13470 base_type = int_type;
13473 int_type = objfile_type (objfile)->builtin_long_long;
13474 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13475 base_type = int_type;
13481 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13482 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13483 low |= negative_mask;
13484 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13485 high |= negative_mask;
13487 range_type = create_range_type (NULL, orig_base_type, low, high);
13489 /* Mark arrays with dynamic length at least as an array of unspecified
13490 length. GDB could check the boundary but before it gets implemented at
13491 least allow accessing the array elements. */
13492 if (attr && attr_form_is_block (attr))
13493 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13495 /* Ada expects an empty array on no boundary attributes. */
13496 if (attr == NULL && cu->language != language_ada)
13497 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13499 name = dwarf2_name (die, cu);
13501 TYPE_NAME (range_type) = name;
13503 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13505 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13507 set_die_type (die, range_type, cu);
13509 /* set_die_type should be already done. */
13510 set_descriptive_type (range_type, die, cu);
13515 static struct type *
13516 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13520 /* For now, we only support the C meaning of an unspecified type: void. */
13522 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13523 TYPE_NAME (type) = dwarf2_name (die, cu);
13525 return set_die_type (die, type, cu);
13528 /* Read a single die and all its descendents. Set the die's sibling
13529 field to NULL; set other fields in the die correctly, and set all
13530 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13531 location of the info_ptr after reading all of those dies. PARENT
13532 is the parent of the die in question. */
13534 static struct die_info *
13535 read_die_and_children (const struct die_reader_specs *reader,
13536 const gdb_byte *info_ptr,
13537 const gdb_byte **new_info_ptr,
13538 struct die_info *parent)
13540 struct die_info *die;
13541 const gdb_byte *cur_ptr;
13544 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13547 *new_info_ptr = cur_ptr;
13550 store_in_ref_table (die, reader->cu);
13553 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13557 *new_info_ptr = cur_ptr;
13560 die->sibling = NULL;
13561 die->parent = parent;
13565 /* Read a die, all of its descendents, and all of its siblings; set
13566 all of the fields of all of the dies correctly. Arguments are as
13567 in read_die_and_children. */
13569 static struct die_info *
13570 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13571 const gdb_byte *info_ptr,
13572 const gdb_byte **new_info_ptr,
13573 struct die_info *parent)
13575 struct die_info *first_die, *last_sibling;
13576 const gdb_byte *cur_ptr;
13578 cur_ptr = info_ptr;
13579 first_die = last_sibling = NULL;
13583 struct die_info *die
13584 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13588 *new_info_ptr = cur_ptr;
13595 last_sibling->sibling = die;
13597 last_sibling = die;
13601 /* Read a die, all of its descendents, and all of its siblings; set
13602 all of the fields of all of the dies correctly. Arguments are as
13603 in read_die_and_children.
13604 This the main entry point for reading a DIE and all its children. */
13606 static struct die_info *
13607 read_die_and_siblings (const struct die_reader_specs *reader,
13608 const gdb_byte *info_ptr,
13609 const gdb_byte **new_info_ptr,
13610 struct die_info *parent)
13612 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13613 new_info_ptr, parent);
13615 if (dwarf2_die_debug)
13617 fprintf_unfiltered (gdb_stdlog,
13618 "Read die from %s@0x%x of %s:\n",
13619 bfd_section_name (reader->abfd,
13620 reader->die_section->asection),
13621 (unsigned) (info_ptr - reader->die_section->buffer),
13622 bfd_get_filename (reader->abfd));
13623 dump_die (die, dwarf2_die_debug);
13629 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13631 The caller is responsible for filling in the extra attributes
13632 and updating (*DIEP)->num_attrs.
13633 Set DIEP to point to a newly allocated die with its information,
13634 except for its child, sibling, and parent fields.
13635 Set HAS_CHILDREN to tell whether the die has children or not. */
13637 static const gdb_byte *
13638 read_full_die_1 (const struct die_reader_specs *reader,
13639 struct die_info **diep, const gdb_byte *info_ptr,
13640 int *has_children, int num_extra_attrs)
13642 unsigned int abbrev_number, bytes_read, i;
13643 sect_offset offset;
13644 struct abbrev_info *abbrev;
13645 struct die_info *die;
13646 struct dwarf2_cu *cu = reader->cu;
13647 bfd *abfd = reader->abfd;
13649 offset.sect_off = info_ptr - reader->buffer;
13650 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13651 info_ptr += bytes_read;
13652 if (!abbrev_number)
13659 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13661 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13663 bfd_get_filename (abfd));
13665 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13666 die->offset = offset;
13667 die->tag = abbrev->tag;
13668 die->abbrev = abbrev_number;
13670 /* Make the result usable.
13671 The caller needs to update num_attrs after adding the extra
13673 die->num_attrs = abbrev->num_attrs;
13675 for (i = 0; i < abbrev->num_attrs; ++i)
13676 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13680 *has_children = abbrev->has_children;
13684 /* Read a die and all its attributes.
13685 Set DIEP to point to a newly allocated die with its information,
13686 except for its child, sibling, and parent fields.
13687 Set HAS_CHILDREN to tell whether the die has children or not. */
13689 static const gdb_byte *
13690 read_full_die (const struct die_reader_specs *reader,
13691 struct die_info **diep, const gdb_byte *info_ptr,
13694 const gdb_byte *result;
13696 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13698 if (dwarf2_die_debug)
13700 fprintf_unfiltered (gdb_stdlog,
13701 "Read die from %s@0x%x of %s:\n",
13702 bfd_section_name (reader->abfd,
13703 reader->die_section->asection),
13704 (unsigned) (info_ptr - reader->die_section->buffer),
13705 bfd_get_filename (reader->abfd));
13706 dump_die (*diep, dwarf2_die_debug);
13712 /* Abbreviation tables.
13714 In DWARF version 2, the description of the debugging information is
13715 stored in a separate .debug_abbrev section. Before we read any
13716 dies from a section we read in all abbreviations and install them
13717 in a hash table. */
13719 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13721 static struct abbrev_info *
13722 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13724 struct abbrev_info *abbrev;
13726 abbrev = (struct abbrev_info *)
13727 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13728 memset (abbrev, 0, sizeof (struct abbrev_info));
13732 /* Add an abbreviation to the table. */
13735 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13736 unsigned int abbrev_number,
13737 struct abbrev_info *abbrev)
13739 unsigned int hash_number;
13741 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13742 abbrev->next = abbrev_table->abbrevs[hash_number];
13743 abbrev_table->abbrevs[hash_number] = abbrev;
13746 /* Look up an abbrev in the table.
13747 Returns NULL if the abbrev is not found. */
13749 static struct abbrev_info *
13750 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13751 unsigned int abbrev_number)
13753 unsigned int hash_number;
13754 struct abbrev_info *abbrev;
13756 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13757 abbrev = abbrev_table->abbrevs[hash_number];
13761 if (abbrev->number == abbrev_number)
13763 abbrev = abbrev->next;
13768 /* Read in an abbrev table. */
13770 static struct abbrev_table *
13771 abbrev_table_read_table (struct dwarf2_section_info *section,
13772 sect_offset offset)
13774 struct objfile *objfile = dwarf2_per_objfile->objfile;
13775 bfd *abfd = section->asection->owner;
13776 struct abbrev_table *abbrev_table;
13777 const gdb_byte *abbrev_ptr;
13778 struct abbrev_info *cur_abbrev;
13779 unsigned int abbrev_number, bytes_read, abbrev_name;
13780 unsigned int abbrev_form;
13781 struct attr_abbrev *cur_attrs;
13782 unsigned int allocated_attrs;
13784 abbrev_table = XMALLOC (struct abbrev_table);
13785 abbrev_table->offset = offset;
13786 obstack_init (&abbrev_table->abbrev_obstack);
13787 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13789 * sizeof (struct abbrev_info *)));
13790 memset (abbrev_table->abbrevs, 0,
13791 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13793 dwarf2_read_section (objfile, section);
13794 abbrev_ptr = section->buffer + offset.sect_off;
13795 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13796 abbrev_ptr += bytes_read;
13798 allocated_attrs = ATTR_ALLOC_CHUNK;
13799 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13801 /* Loop until we reach an abbrev number of 0. */
13802 while (abbrev_number)
13804 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13806 /* read in abbrev header */
13807 cur_abbrev->number = abbrev_number;
13808 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13809 abbrev_ptr += bytes_read;
13810 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13813 /* now read in declarations */
13814 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13815 abbrev_ptr += bytes_read;
13816 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13817 abbrev_ptr += bytes_read;
13818 while (abbrev_name)
13820 if (cur_abbrev->num_attrs == allocated_attrs)
13822 allocated_attrs += ATTR_ALLOC_CHUNK;
13824 = xrealloc (cur_attrs, (allocated_attrs
13825 * sizeof (struct attr_abbrev)));
13828 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13829 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13830 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13831 abbrev_ptr += bytes_read;
13832 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13833 abbrev_ptr += bytes_read;
13836 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13837 (cur_abbrev->num_attrs
13838 * sizeof (struct attr_abbrev)));
13839 memcpy (cur_abbrev->attrs, cur_attrs,
13840 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13842 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13844 /* Get next abbreviation.
13845 Under Irix6 the abbreviations for a compilation unit are not
13846 always properly terminated with an abbrev number of 0.
13847 Exit loop if we encounter an abbreviation which we have
13848 already read (which means we are about to read the abbreviations
13849 for the next compile unit) or if the end of the abbreviation
13850 table is reached. */
13851 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13853 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13854 abbrev_ptr += bytes_read;
13855 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13860 return abbrev_table;
13863 /* Free the resources held by ABBREV_TABLE. */
13866 abbrev_table_free (struct abbrev_table *abbrev_table)
13868 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13869 xfree (abbrev_table);
13872 /* Same as abbrev_table_free but as a cleanup.
13873 We pass in a pointer to the pointer to the table so that we can
13874 set the pointer to NULL when we're done. It also simplifies
13875 build_type_unit_groups. */
13878 abbrev_table_free_cleanup (void *table_ptr)
13880 struct abbrev_table **abbrev_table_ptr = table_ptr;
13882 if (*abbrev_table_ptr != NULL)
13883 abbrev_table_free (*abbrev_table_ptr);
13884 *abbrev_table_ptr = NULL;
13887 /* Read the abbrev table for CU from ABBREV_SECTION. */
13890 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13891 struct dwarf2_section_info *abbrev_section)
13894 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13897 /* Release the memory used by the abbrev table for a compilation unit. */
13900 dwarf2_free_abbrev_table (void *ptr_to_cu)
13902 struct dwarf2_cu *cu = ptr_to_cu;
13904 if (cu->abbrev_table != NULL)
13905 abbrev_table_free (cu->abbrev_table);
13906 /* Set this to NULL so that we SEGV if we try to read it later,
13907 and also because free_comp_unit verifies this is NULL. */
13908 cu->abbrev_table = NULL;
13911 /* Returns nonzero if TAG represents a type that we might generate a partial
13915 is_type_tag_for_partial (int tag)
13920 /* Some types that would be reasonable to generate partial symbols for,
13921 that we don't at present. */
13922 case DW_TAG_array_type:
13923 case DW_TAG_file_type:
13924 case DW_TAG_ptr_to_member_type:
13925 case DW_TAG_set_type:
13926 case DW_TAG_string_type:
13927 case DW_TAG_subroutine_type:
13929 case DW_TAG_base_type:
13930 case DW_TAG_class_type:
13931 case DW_TAG_interface_type:
13932 case DW_TAG_enumeration_type:
13933 case DW_TAG_structure_type:
13934 case DW_TAG_subrange_type:
13935 case DW_TAG_typedef:
13936 case DW_TAG_union_type:
13943 /* Load all DIEs that are interesting for partial symbols into memory. */
13945 static struct partial_die_info *
13946 load_partial_dies (const struct die_reader_specs *reader,
13947 const gdb_byte *info_ptr, int building_psymtab)
13949 struct dwarf2_cu *cu = reader->cu;
13950 struct objfile *objfile = cu->objfile;
13951 struct partial_die_info *part_die;
13952 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13953 struct abbrev_info *abbrev;
13954 unsigned int bytes_read;
13955 unsigned int load_all = 0;
13956 int nesting_level = 1;
13961 gdb_assert (cu->per_cu != NULL);
13962 if (cu->per_cu->load_all_dies)
13966 = htab_create_alloc_ex (cu->header.length / 12,
13970 &cu->comp_unit_obstack,
13971 hashtab_obstack_allocate,
13972 dummy_obstack_deallocate);
13974 part_die = obstack_alloc (&cu->comp_unit_obstack,
13975 sizeof (struct partial_die_info));
13979 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13981 /* A NULL abbrev means the end of a series of children. */
13982 if (abbrev == NULL)
13984 if (--nesting_level == 0)
13986 /* PART_DIE was probably the last thing allocated on the
13987 comp_unit_obstack, so we could call obstack_free
13988 here. We don't do that because the waste is small,
13989 and will be cleaned up when we're done with this
13990 compilation unit. This way, we're also more robust
13991 against other users of the comp_unit_obstack. */
13994 info_ptr += bytes_read;
13995 last_die = parent_die;
13996 parent_die = parent_die->die_parent;
14000 /* Check for template arguments. We never save these; if
14001 they're seen, we just mark the parent, and go on our way. */
14002 if (parent_die != NULL
14003 && cu->language == language_cplus
14004 && (abbrev->tag == DW_TAG_template_type_param
14005 || abbrev->tag == DW_TAG_template_value_param))
14007 parent_die->has_template_arguments = 1;
14011 /* We don't need a partial DIE for the template argument. */
14012 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14017 /* We only recurse into c++ subprograms looking for template arguments.
14018 Skip their other children. */
14020 && cu->language == language_cplus
14021 && parent_die != NULL
14022 && parent_die->tag == DW_TAG_subprogram)
14024 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14028 /* Check whether this DIE is interesting enough to save. Normally
14029 we would not be interested in members here, but there may be
14030 later variables referencing them via DW_AT_specification (for
14031 static members). */
14033 && !is_type_tag_for_partial (abbrev->tag)
14034 && abbrev->tag != DW_TAG_constant
14035 && abbrev->tag != DW_TAG_enumerator
14036 && abbrev->tag != DW_TAG_subprogram
14037 && abbrev->tag != DW_TAG_lexical_block
14038 && abbrev->tag != DW_TAG_variable
14039 && abbrev->tag != DW_TAG_namespace
14040 && abbrev->tag != DW_TAG_module
14041 && abbrev->tag != DW_TAG_member
14042 && abbrev->tag != DW_TAG_imported_unit)
14044 /* Otherwise we skip to the next sibling, if any. */
14045 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14049 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
14052 /* This two-pass algorithm for processing partial symbols has a
14053 high cost in cache pressure. Thus, handle some simple cases
14054 here which cover the majority of C partial symbols. DIEs
14055 which neither have specification tags in them, nor could have
14056 specification tags elsewhere pointing at them, can simply be
14057 processed and discarded.
14059 This segment is also optional; scan_partial_symbols and
14060 add_partial_symbol will handle these DIEs if we chain
14061 them in normally. When compilers which do not emit large
14062 quantities of duplicate debug information are more common,
14063 this code can probably be removed. */
14065 /* Any complete simple types at the top level (pretty much all
14066 of them, for a language without namespaces), can be processed
14068 if (parent_die == NULL
14069 && part_die->has_specification == 0
14070 && part_die->is_declaration == 0
14071 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
14072 || part_die->tag == DW_TAG_base_type
14073 || part_die->tag == DW_TAG_subrange_type))
14075 if (building_psymtab && part_die->name != NULL)
14076 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14077 VAR_DOMAIN, LOC_TYPEDEF,
14078 &objfile->static_psymbols,
14079 0, (CORE_ADDR) 0, cu->language, objfile);
14080 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14084 /* The exception for DW_TAG_typedef with has_children above is
14085 a workaround of GCC PR debug/47510. In the case of this complaint
14086 type_name_no_tag_or_error will error on such types later.
14088 GDB skipped children of DW_TAG_typedef by the shortcut above and then
14089 it could not find the child DIEs referenced later, this is checked
14090 above. In correct DWARF DW_TAG_typedef should have no children. */
14092 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
14093 complaint (&symfile_complaints,
14094 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
14095 "- DIE at 0x%x [in module %s]"),
14096 part_die->offset.sect_off, objfile->name);
14098 /* If we're at the second level, and we're an enumerator, and
14099 our parent has no specification (meaning possibly lives in a
14100 namespace elsewhere), then we can add the partial symbol now
14101 instead of queueing it. */
14102 if (part_die->tag == DW_TAG_enumerator
14103 && parent_die != NULL
14104 && parent_die->die_parent == NULL
14105 && parent_die->tag == DW_TAG_enumeration_type
14106 && parent_die->has_specification == 0)
14108 if (part_die->name == NULL)
14109 complaint (&symfile_complaints,
14110 _("malformed enumerator DIE ignored"));
14111 else if (building_psymtab)
14112 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14113 VAR_DOMAIN, LOC_CONST,
14114 (cu->language == language_cplus
14115 || cu->language == language_java)
14116 ? &objfile->global_psymbols
14117 : &objfile->static_psymbols,
14118 0, (CORE_ADDR) 0, cu->language, objfile);
14120 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14124 /* We'll save this DIE so link it in. */
14125 part_die->die_parent = parent_die;
14126 part_die->die_sibling = NULL;
14127 part_die->die_child = NULL;
14129 if (last_die && last_die == parent_die)
14130 last_die->die_child = part_die;
14132 last_die->die_sibling = part_die;
14134 last_die = part_die;
14136 if (first_die == NULL)
14137 first_die = part_die;
14139 /* Maybe add the DIE to the hash table. Not all DIEs that we
14140 find interesting need to be in the hash table, because we
14141 also have the parent/sibling/child chains; only those that we
14142 might refer to by offset later during partial symbol reading.
14144 For now this means things that might have be the target of a
14145 DW_AT_specification, DW_AT_abstract_origin, or
14146 DW_AT_extension. DW_AT_extension will refer only to
14147 namespaces; DW_AT_abstract_origin refers to functions (and
14148 many things under the function DIE, but we do not recurse
14149 into function DIEs during partial symbol reading) and
14150 possibly variables as well; DW_AT_specification refers to
14151 declarations. Declarations ought to have the DW_AT_declaration
14152 flag. It happens that GCC forgets to put it in sometimes, but
14153 only for functions, not for types.
14155 Adding more things than necessary to the hash table is harmless
14156 except for the performance cost. Adding too few will result in
14157 wasted time in find_partial_die, when we reread the compilation
14158 unit with load_all_dies set. */
14161 || abbrev->tag == DW_TAG_constant
14162 || abbrev->tag == DW_TAG_subprogram
14163 || abbrev->tag == DW_TAG_variable
14164 || abbrev->tag == DW_TAG_namespace
14165 || part_die->is_declaration)
14169 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
14170 part_die->offset.sect_off, INSERT);
14174 part_die = obstack_alloc (&cu->comp_unit_obstack,
14175 sizeof (struct partial_die_info));
14177 /* For some DIEs we want to follow their children (if any). For C
14178 we have no reason to follow the children of structures; for other
14179 languages we have to, so that we can get at method physnames
14180 to infer fully qualified class names, for DW_AT_specification,
14181 and for C++ template arguments. For C++, we also look one level
14182 inside functions to find template arguments (if the name of the
14183 function does not already contain the template arguments).
14185 For Ada, we need to scan the children of subprograms and lexical
14186 blocks as well because Ada allows the definition of nested
14187 entities that could be interesting for the debugger, such as
14188 nested subprograms for instance. */
14189 if (last_die->has_children
14191 || last_die->tag == DW_TAG_namespace
14192 || last_die->tag == DW_TAG_module
14193 || last_die->tag == DW_TAG_enumeration_type
14194 || (cu->language == language_cplus
14195 && last_die->tag == DW_TAG_subprogram
14196 && (last_die->name == NULL
14197 || strchr (last_die->name, '<') == NULL))
14198 || (cu->language != language_c
14199 && (last_die->tag == DW_TAG_class_type
14200 || last_die->tag == DW_TAG_interface_type
14201 || last_die->tag == DW_TAG_structure_type
14202 || last_die->tag == DW_TAG_union_type))
14203 || (cu->language == language_ada
14204 && (last_die->tag == DW_TAG_subprogram
14205 || last_die->tag == DW_TAG_lexical_block))))
14208 parent_die = last_die;
14212 /* Otherwise we skip to the next sibling, if any. */
14213 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
14215 /* Back to the top, do it again. */
14219 /* Read a minimal amount of information into the minimal die structure. */
14221 static const gdb_byte *
14222 read_partial_die (const struct die_reader_specs *reader,
14223 struct partial_die_info *part_die,
14224 struct abbrev_info *abbrev, unsigned int abbrev_len,
14225 const gdb_byte *info_ptr)
14227 struct dwarf2_cu *cu = reader->cu;
14228 struct objfile *objfile = cu->objfile;
14229 const gdb_byte *buffer = reader->buffer;
14231 struct attribute attr;
14232 int has_low_pc_attr = 0;
14233 int has_high_pc_attr = 0;
14234 int high_pc_relative = 0;
14236 memset (part_die, 0, sizeof (struct partial_die_info));
14238 part_die->offset.sect_off = info_ptr - buffer;
14240 info_ptr += abbrev_len;
14242 if (abbrev == NULL)
14245 part_die->tag = abbrev->tag;
14246 part_die->has_children = abbrev->has_children;
14248 for (i = 0; i < abbrev->num_attrs; ++i)
14250 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
14252 /* Store the data if it is of an attribute we want to keep in a
14253 partial symbol table. */
14257 switch (part_die->tag)
14259 case DW_TAG_compile_unit:
14260 case DW_TAG_partial_unit:
14261 case DW_TAG_type_unit:
14262 /* Compilation units have a DW_AT_name that is a filename, not
14263 a source language identifier. */
14264 case DW_TAG_enumeration_type:
14265 case DW_TAG_enumerator:
14266 /* These tags always have simple identifiers already; no need
14267 to canonicalize them. */
14268 part_die->name = DW_STRING (&attr);
14272 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
14273 &objfile->objfile_obstack);
14277 case DW_AT_linkage_name:
14278 case DW_AT_MIPS_linkage_name:
14279 /* Note that both forms of linkage name might appear. We
14280 assume they will be the same, and we only store the last
14282 if (cu->language == language_ada)
14283 part_die->name = DW_STRING (&attr);
14284 part_die->linkage_name = DW_STRING (&attr);
14287 has_low_pc_attr = 1;
14288 part_die->lowpc = DW_ADDR (&attr);
14290 case DW_AT_high_pc:
14291 has_high_pc_attr = 1;
14292 if (attr.form == DW_FORM_addr
14293 || attr.form == DW_FORM_GNU_addr_index)
14294 part_die->highpc = DW_ADDR (&attr);
14297 high_pc_relative = 1;
14298 part_die->highpc = DW_UNSND (&attr);
14301 case DW_AT_location:
14302 /* Support the .debug_loc offsets. */
14303 if (attr_form_is_block (&attr))
14305 part_die->d.locdesc = DW_BLOCK (&attr);
14307 else if (attr_form_is_section_offset (&attr))
14309 dwarf2_complex_location_expr_complaint ();
14313 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14314 "partial symbol information");
14317 case DW_AT_external:
14318 part_die->is_external = DW_UNSND (&attr);
14320 case DW_AT_declaration:
14321 part_die->is_declaration = DW_UNSND (&attr);
14324 part_die->has_type = 1;
14326 case DW_AT_abstract_origin:
14327 case DW_AT_specification:
14328 case DW_AT_extension:
14329 part_die->has_specification = 1;
14330 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
14331 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14332 || cu->per_cu->is_dwz);
14334 case DW_AT_sibling:
14335 /* Ignore absolute siblings, they might point outside of
14336 the current compile unit. */
14337 if (attr.form == DW_FORM_ref_addr)
14338 complaint (&symfile_complaints,
14339 _("ignoring absolute DW_AT_sibling"));
14341 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
14343 case DW_AT_byte_size:
14344 part_die->has_byte_size = 1;
14346 case DW_AT_calling_convention:
14347 /* DWARF doesn't provide a way to identify a program's source-level
14348 entry point. DW_AT_calling_convention attributes are only meant
14349 to describe functions' calling conventions.
14351 However, because it's a necessary piece of information in
14352 Fortran, and because DW_CC_program is the only piece of debugging
14353 information whose definition refers to a 'main program' at all,
14354 several compilers have begun marking Fortran main programs with
14355 DW_CC_program --- even when those functions use the standard
14356 calling conventions.
14358 So until DWARF specifies a way to provide this information and
14359 compilers pick up the new representation, we'll support this
14361 if (DW_UNSND (&attr) == DW_CC_program
14362 && cu->language == language_fortran)
14364 set_main_name (part_die->name);
14366 /* As this DIE has a static linkage the name would be difficult
14367 to look up later. */
14368 language_of_main = language_fortran;
14372 if (DW_UNSND (&attr) == DW_INL_inlined
14373 || DW_UNSND (&attr) == DW_INL_declared_inlined)
14374 part_die->may_be_inlined = 1;
14378 if (part_die->tag == DW_TAG_imported_unit)
14380 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
14381 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14382 || cu->per_cu->is_dwz);
14391 if (high_pc_relative)
14392 part_die->highpc += part_die->lowpc;
14394 if (has_low_pc_attr && has_high_pc_attr)
14396 /* When using the GNU linker, .gnu.linkonce. sections are used to
14397 eliminate duplicate copies of functions and vtables and such.
14398 The linker will arbitrarily choose one and discard the others.
14399 The AT_*_pc values for such functions refer to local labels in
14400 these sections. If the section from that file was discarded, the
14401 labels are not in the output, so the relocs get a value of 0.
14402 If this is a discarded function, mark the pc bounds as invalid,
14403 so that GDB will ignore it. */
14404 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
14406 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14408 complaint (&symfile_complaints,
14409 _("DW_AT_low_pc %s is zero "
14410 "for DIE at 0x%x [in module %s]"),
14411 paddress (gdbarch, part_die->lowpc),
14412 part_die->offset.sect_off, objfile->name);
14414 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
14415 else if (part_die->lowpc >= part_die->highpc)
14417 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14419 complaint (&symfile_complaints,
14420 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
14421 "for DIE at 0x%x [in module %s]"),
14422 paddress (gdbarch, part_die->lowpc),
14423 paddress (gdbarch, part_die->highpc),
14424 part_die->offset.sect_off, objfile->name);
14427 part_die->has_pc_info = 1;
14433 /* Find a cached partial DIE at OFFSET in CU. */
14435 static struct partial_die_info *
14436 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
14438 struct partial_die_info *lookup_die = NULL;
14439 struct partial_die_info part_die;
14441 part_die.offset = offset;
14442 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
14448 /* Find a partial DIE at OFFSET, which may or may not be in CU,
14449 except in the case of .debug_types DIEs which do not reference
14450 outside their CU (they do however referencing other types via
14451 DW_FORM_ref_sig8). */
14453 static struct partial_die_info *
14454 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
14456 struct objfile *objfile = cu->objfile;
14457 struct dwarf2_per_cu_data *per_cu = NULL;
14458 struct partial_die_info *pd = NULL;
14460 if (offset_in_dwz == cu->per_cu->is_dwz
14461 && offset_in_cu_p (&cu->header, offset))
14463 pd = find_partial_die_in_comp_unit (offset, cu);
14466 /* We missed recording what we needed.
14467 Load all dies and try again. */
14468 per_cu = cu->per_cu;
14472 /* TUs don't reference other CUs/TUs (except via type signatures). */
14473 if (cu->per_cu->is_debug_types)
14475 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14476 " external reference to offset 0x%lx [in module %s].\n"),
14477 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14478 bfd_get_filename (objfile->obfd));
14480 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14483 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14484 load_partial_comp_unit (per_cu);
14486 per_cu->cu->last_used = 0;
14487 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14490 /* If we didn't find it, and not all dies have been loaded,
14491 load them all and try again. */
14493 if (pd == NULL && per_cu->load_all_dies == 0)
14495 per_cu->load_all_dies = 1;
14497 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14498 THIS_CU->cu may already be in use. So we can't just free it and
14499 replace its DIEs with the ones we read in. Instead, we leave those
14500 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14501 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14503 load_partial_comp_unit (per_cu);
14505 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14509 internal_error (__FILE__, __LINE__,
14510 _("could not find partial DIE 0x%x "
14511 "in cache [from module %s]\n"),
14512 offset.sect_off, bfd_get_filename (objfile->obfd));
14516 /* See if we can figure out if the class lives in a namespace. We do
14517 this by looking for a member function; its demangled name will
14518 contain namespace info, if there is any. */
14521 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14522 struct dwarf2_cu *cu)
14524 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14525 what template types look like, because the demangler
14526 frequently doesn't give the same name as the debug info. We
14527 could fix this by only using the demangled name to get the
14528 prefix (but see comment in read_structure_type). */
14530 struct partial_die_info *real_pdi;
14531 struct partial_die_info *child_pdi;
14533 /* If this DIE (this DIE's specification, if any) has a parent, then
14534 we should not do this. We'll prepend the parent's fully qualified
14535 name when we create the partial symbol. */
14537 real_pdi = struct_pdi;
14538 while (real_pdi->has_specification)
14539 real_pdi = find_partial_die (real_pdi->spec_offset,
14540 real_pdi->spec_is_dwz, cu);
14542 if (real_pdi->die_parent != NULL)
14545 for (child_pdi = struct_pdi->die_child;
14547 child_pdi = child_pdi->die_sibling)
14549 if (child_pdi->tag == DW_TAG_subprogram
14550 && child_pdi->linkage_name != NULL)
14552 char *actual_class_name
14553 = language_class_name_from_physname (cu->language_defn,
14554 child_pdi->linkage_name);
14555 if (actual_class_name != NULL)
14558 = obstack_copy0 (&cu->objfile->objfile_obstack,
14560 strlen (actual_class_name));
14561 xfree (actual_class_name);
14568 /* Adjust PART_DIE before generating a symbol for it. This function
14569 may set the is_external flag or change the DIE's name. */
14572 fixup_partial_die (struct partial_die_info *part_die,
14573 struct dwarf2_cu *cu)
14575 /* Once we've fixed up a die, there's no point in doing so again.
14576 This also avoids a memory leak if we were to call
14577 guess_partial_die_structure_name multiple times. */
14578 if (part_die->fixup_called)
14581 /* If we found a reference attribute and the DIE has no name, try
14582 to find a name in the referred to DIE. */
14584 if (part_die->name == NULL && part_die->has_specification)
14586 struct partial_die_info *spec_die;
14588 spec_die = find_partial_die (part_die->spec_offset,
14589 part_die->spec_is_dwz, cu);
14591 fixup_partial_die (spec_die, cu);
14593 if (spec_die->name)
14595 part_die->name = spec_die->name;
14597 /* Copy DW_AT_external attribute if it is set. */
14598 if (spec_die->is_external)
14599 part_die->is_external = spec_die->is_external;
14603 /* Set default names for some unnamed DIEs. */
14605 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14606 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14608 /* If there is no parent die to provide a namespace, and there are
14609 children, see if we can determine the namespace from their linkage
14611 if (cu->language == language_cplus
14612 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14613 && part_die->die_parent == NULL
14614 && part_die->has_children
14615 && (part_die->tag == DW_TAG_class_type
14616 || part_die->tag == DW_TAG_structure_type
14617 || part_die->tag == DW_TAG_union_type))
14618 guess_partial_die_structure_name (part_die, cu);
14620 /* GCC might emit a nameless struct or union that has a linkage
14621 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14622 if (part_die->name == NULL
14623 && (part_die->tag == DW_TAG_class_type
14624 || part_die->tag == DW_TAG_interface_type
14625 || part_die->tag == DW_TAG_structure_type
14626 || part_die->tag == DW_TAG_union_type)
14627 && part_die->linkage_name != NULL)
14631 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14636 /* Strip any leading namespaces/classes, keep only the base name.
14637 DW_AT_name for named DIEs does not contain the prefixes. */
14638 base = strrchr (demangled, ':');
14639 if (base && base > demangled && base[-1] == ':')
14644 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14645 base, strlen (base));
14650 part_die->fixup_called = 1;
14653 /* Read an attribute value described by an attribute form. */
14655 static const gdb_byte *
14656 read_attribute_value (const struct die_reader_specs *reader,
14657 struct attribute *attr, unsigned form,
14658 const gdb_byte *info_ptr)
14660 struct dwarf2_cu *cu = reader->cu;
14661 bfd *abfd = reader->abfd;
14662 struct comp_unit_head *cu_header = &cu->header;
14663 unsigned int bytes_read;
14664 struct dwarf_block *blk;
14669 case DW_FORM_ref_addr:
14670 if (cu->header.version == 2)
14671 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14673 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14674 &cu->header, &bytes_read);
14675 info_ptr += bytes_read;
14677 case DW_FORM_GNU_ref_alt:
14678 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14679 info_ptr += bytes_read;
14682 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14683 info_ptr += bytes_read;
14685 case DW_FORM_block2:
14686 blk = dwarf_alloc_block (cu);
14687 blk->size = read_2_bytes (abfd, info_ptr);
14689 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14690 info_ptr += blk->size;
14691 DW_BLOCK (attr) = blk;
14693 case DW_FORM_block4:
14694 blk = dwarf_alloc_block (cu);
14695 blk->size = read_4_bytes (abfd, info_ptr);
14697 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14698 info_ptr += blk->size;
14699 DW_BLOCK (attr) = blk;
14701 case DW_FORM_data2:
14702 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14705 case DW_FORM_data4:
14706 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14709 case DW_FORM_data8:
14710 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14713 case DW_FORM_sec_offset:
14714 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14715 info_ptr += bytes_read;
14717 case DW_FORM_string:
14718 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14719 DW_STRING_IS_CANONICAL (attr) = 0;
14720 info_ptr += bytes_read;
14723 if (!cu->per_cu->is_dwz)
14725 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14727 DW_STRING_IS_CANONICAL (attr) = 0;
14728 info_ptr += bytes_read;
14732 case DW_FORM_GNU_strp_alt:
14734 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14735 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14738 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14739 DW_STRING_IS_CANONICAL (attr) = 0;
14740 info_ptr += bytes_read;
14743 case DW_FORM_exprloc:
14744 case DW_FORM_block:
14745 blk = dwarf_alloc_block (cu);
14746 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14747 info_ptr += bytes_read;
14748 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14749 info_ptr += blk->size;
14750 DW_BLOCK (attr) = blk;
14752 case DW_FORM_block1:
14753 blk = dwarf_alloc_block (cu);
14754 blk->size = read_1_byte (abfd, info_ptr);
14756 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14757 info_ptr += blk->size;
14758 DW_BLOCK (attr) = blk;
14760 case DW_FORM_data1:
14761 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14765 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14768 case DW_FORM_flag_present:
14769 DW_UNSND (attr) = 1;
14771 case DW_FORM_sdata:
14772 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14773 info_ptr += bytes_read;
14775 case DW_FORM_udata:
14776 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14777 info_ptr += bytes_read;
14780 DW_UNSND (attr) = (cu->header.offset.sect_off
14781 + read_1_byte (abfd, info_ptr));
14785 DW_UNSND (attr) = (cu->header.offset.sect_off
14786 + read_2_bytes (abfd, info_ptr));
14790 DW_UNSND (attr) = (cu->header.offset.sect_off
14791 + read_4_bytes (abfd, info_ptr));
14795 DW_UNSND (attr) = (cu->header.offset.sect_off
14796 + read_8_bytes (abfd, info_ptr));
14799 case DW_FORM_ref_sig8:
14800 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14803 case DW_FORM_ref_udata:
14804 DW_UNSND (attr) = (cu->header.offset.sect_off
14805 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14806 info_ptr += bytes_read;
14808 case DW_FORM_indirect:
14809 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14810 info_ptr += bytes_read;
14811 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14813 case DW_FORM_GNU_addr_index:
14814 if (reader->dwo_file == NULL)
14816 /* For now flag a hard error.
14817 Later we can turn this into a complaint. */
14818 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14819 dwarf_form_name (form),
14820 bfd_get_filename (abfd));
14822 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14823 info_ptr += bytes_read;
14825 case DW_FORM_GNU_str_index:
14826 if (reader->dwo_file == NULL)
14828 /* For now flag a hard error.
14829 Later we can turn this into a complaint if warranted. */
14830 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14831 dwarf_form_name (form),
14832 bfd_get_filename (abfd));
14835 ULONGEST str_index =
14836 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14838 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14839 DW_STRING_IS_CANONICAL (attr) = 0;
14840 info_ptr += bytes_read;
14844 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14845 dwarf_form_name (form),
14846 bfd_get_filename (abfd));
14850 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
14851 attr->form = DW_FORM_GNU_ref_alt;
14853 /* We have seen instances where the compiler tried to emit a byte
14854 size attribute of -1 which ended up being encoded as an unsigned
14855 0xffffffff. Although 0xffffffff is technically a valid size value,
14856 an object of this size seems pretty unlikely so we can relatively
14857 safely treat these cases as if the size attribute was invalid and
14858 treat them as zero by default. */
14859 if (attr->name == DW_AT_byte_size
14860 && form == DW_FORM_data4
14861 && DW_UNSND (attr) >= 0xffffffff)
14864 (&symfile_complaints,
14865 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14866 hex_string (DW_UNSND (attr)));
14867 DW_UNSND (attr) = 0;
14873 /* Read an attribute described by an abbreviated attribute. */
14875 static const gdb_byte *
14876 read_attribute (const struct die_reader_specs *reader,
14877 struct attribute *attr, struct attr_abbrev *abbrev,
14878 const gdb_byte *info_ptr)
14880 attr->name = abbrev->name;
14881 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14884 /* Read dwarf information from a buffer. */
14886 static unsigned int
14887 read_1_byte (bfd *abfd, const gdb_byte *buf)
14889 return bfd_get_8 (abfd, buf);
14893 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14895 return bfd_get_signed_8 (abfd, buf);
14898 static unsigned int
14899 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14901 return bfd_get_16 (abfd, buf);
14905 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14907 return bfd_get_signed_16 (abfd, buf);
14910 static unsigned int
14911 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14913 return bfd_get_32 (abfd, buf);
14917 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14919 return bfd_get_signed_32 (abfd, buf);
14923 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14925 return bfd_get_64 (abfd, buf);
14929 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14930 unsigned int *bytes_read)
14932 struct comp_unit_head *cu_header = &cu->header;
14933 CORE_ADDR retval = 0;
14935 if (cu_header->signed_addr_p)
14937 switch (cu_header->addr_size)
14940 retval = bfd_get_signed_16 (abfd, buf);
14943 retval = bfd_get_signed_32 (abfd, buf);
14946 retval = bfd_get_signed_64 (abfd, buf);
14949 internal_error (__FILE__, __LINE__,
14950 _("read_address: bad switch, signed [in module %s]"),
14951 bfd_get_filename (abfd));
14956 switch (cu_header->addr_size)
14959 retval = bfd_get_16 (abfd, buf);
14962 retval = bfd_get_32 (abfd, buf);
14965 retval = bfd_get_64 (abfd, buf);
14968 internal_error (__FILE__, __LINE__,
14969 _("read_address: bad switch, "
14970 "unsigned [in module %s]"),
14971 bfd_get_filename (abfd));
14975 *bytes_read = cu_header->addr_size;
14979 /* Read the initial length from a section. The (draft) DWARF 3
14980 specification allows the initial length to take up either 4 bytes
14981 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14982 bytes describe the length and all offsets will be 8 bytes in length
14985 An older, non-standard 64-bit format is also handled by this
14986 function. The older format in question stores the initial length
14987 as an 8-byte quantity without an escape value. Lengths greater
14988 than 2^32 aren't very common which means that the initial 4 bytes
14989 is almost always zero. Since a length value of zero doesn't make
14990 sense for the 32-bit format, this initial zero can be considered to
14991 be an escape value which indicates the presence of the older 64-bit
14992 format. As written, the code can't detect (old format) lengths
14993 greater than 4GB. If it becomes necessary to handle lengths
14994 somewhat larger than 4GB, we could allow other small values (such
14995 as the non-sensical values of 1, 2, and 3) to also be used as
14996 escape values indicating the presence of the old format.
14998 The value returned via bytes_read should be used to increment the
14999 relevant pointer after calling read_initial_length().
15001 [ Note: read_initial_length() and read_offset() are based on the
15002 document entitled "DWARF Debugging Information Format", revision
15003 3, draft 8, dated November 19, 2001. This document was obtained
15006 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
15008 This document is only a draft and is subject to change. (So beware.)
15010 Details regarding the older, non-standard 64-bit format were
15011 determined empirically by examining 64-bit ELF files produced by
15012 the SGI toolchain on an IRIX 6.5 machine.
15014 - Kevin, July 16, 2002
15018 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
15020 LONGEST length = bfd_get_32 (abfd, buf);
15022 if (length == 0xffffffff)
15024 length = bfd_get_64 (abfd, buf + 4);
15027 else if (length == 0)
15029 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
15030 length = bfd_get_64 (abfd, buf);
15041 /* Cover function for read_initial_length.
15042 Returns the length of the object at BUF, and stores the size of the
15043 initial length in *BYTES_READ and stores the size that offsets will be in
15045 If the initial length size is not equivalent to that specified in
15046 CU_HEADER then issue a complaint.
15047 This is useful when reading non-comp-unit headers. */
15050 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
15051 const struct comp_unit_head *cu_header,
15052 unsigned int *bytes_read,
15053 unsigned int *offset_size)
15055 LONGEST length = read_initial_length (abfd, buf, bytes_read);
15057 gdb_assert (cu_header->initial_length_size == 4
15058 || cu_header->initial_length_size == 8
15059 || cu_header->initial_length_size == 12);
15061 if (cu_header->initial_length_size != *bytes_read)
15062 complaint (&symfile_complaints,
15063 _("intermixed 32-bit and 64-bit DWARF sections"));
15065 *offset_size = (*bytes_read == 4) ? 4 : 8;
15069 /* Read an offset from the data stream. The size of the offset is
15070 given by cu_header->offset_size. */
15073 read_offset (bfd *abfd, const gdb_byte *buf,
15074 const struct comp_unit_head *cu_header,
15075 unsigned int *bytes_read)
15077 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
15079 *bytes_read = cu_header->offset_size;
15083 /* Read an offset from the data stream. */
15086 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
15088 LONGEST retval = 0;
15090 switch (offset_size)
15093 retval = bfd_get_32 (abfd, buf);
15096 retval = bfd_get_64 (abfd, buf);
15099 internal_error (__FILE__, __LINE__,
15100 _("read_offset_1: bad switch [in module %s]"),
15101 bfd_get_filename (abfd));
15107 static const gdb_byte *
15108 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
15110 /* If the size of a host char is 8 bits, we can return a pointer
15111 to the buffer, otherwise we have to copy the data to a buffer
15112 allocated on the temporary obstack. */
15113 gdb_assert (HOST_CHAR_BIT == 8);
15117 static const char *
15118 read_direct_string (bfd *abfd, const gdb_byte *buf,
15119 unsigned int *bytes_read_ptr)
15121 /* If the size of a host char is 8 bits, we can return a pointer
15122 to the string, otherwise we have to copy the string to a buffer
15123 allocated on the temporary obstack. */
15124 gdb_assert (HOST_CHAR_BIT == 8);
15127 *bytes_read_ptr = 1;
15130 *bytes_read_ptr = strlen ((const char *) buf) + 1;
15131 return (const char *) buf;
15134 static const char *
15135 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
15137 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
15138 if (dwarf2_per_objfile->str.buffer == NULL)
15139 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
15140 bfd_get_filename (abfd));
15141 if (str_offset >= dwarf2_per_objfile->str.size)
15142 error (_("DW_FORM_strp pointing outside of "
15143 ".debug_str section [in module %s]"),
15144 bfd_get_filename (abfd));
15145 gdb_assert (HOST_CHAR_BIT == 8);
15146 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
15148 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
15151 /* Read a string at offset STR_OFFSET in the .debug_str section from
15152 the .dwz file DWZ. Throw an error if the offset is too large. If
15153 the string consists of a single NUL byte, return NULL; otherwise
15154 return a pointer to the string. */
15156 static const char *
15157 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
15159 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
15161 if (dwz->str.buffer == NULL)
15162 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
15163 "section [in module %s]"),
15164 bfd_get_filename (dwz->dwz_bfd));
15165 if (str_offset >= dwz->str.size)
15166 error (_("DW_FORM_GNU_strp_alt pointing outside of "
15167 ".debug_str section [in module %s]"),
15168 bfd_get_filename (dwz->dwz_bfd));
15169 gdb_assert (HOST_CHAR_BIT == 8);
15170 if (dwz->str.buffer[str_offset] == '\0')
15172 return (const char *) (dwz->str.buffer + str_offset);
15175 static const char *
15176 read_indirect_string (bfd *abfd, const gdb_byte *buf,
15177 const struct comp_unit_head *cu_header,
15178 unsigned int *bytes_read_ptr)
15180 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
15182 return read_indirect_string_at_offset (abfd, str_offset);
15186 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
15187 unsigned int *bytes_read_ptr)
15190 unsigned int num_read;
15192 unsigned char byte;
15200 byte = bfd_get_8 (abfd, buf);
15203 result |= ((ULONGEST) (byte & 127) << shift);
15204 if ((byte & 128) == 0)
15210 *bytes_read_ptr = num_read;
15215 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
15216 unsigned int *bytes_read_ptr)
15219 int i, shift, num_read;
15220 unsigned char byte;
15228 byte = bfd_get_8 (abfd, buf);
15231 result |= ((LONGEST) (byte & 127) << shift);
15233 if ((byte & 128) == 0)
15238 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
15239 result |= -(((LONGEST) 1) << shift);
15240 *bytes_read_ptr = num_read;
15244 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
15245 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
15246 ADDR_SIZE is the size of addresses from the CU header. */
15249 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
15251 struct objfile *objfile = dwarf2_per_objfile->objfile;
15252 bfd *abfd = objfile->obfd;
15253 const gdb_byte *info_ptr;
15255 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
15256 if (dwarf2_per_objfile->addr.buffer == NULL)
15257 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
15259 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
15260 error (_("DW_FORM_addr_index pointing outside of "
15261 ".debug_addr section [in module %s]"),
15263 info_ptr = (dwarf2_per_objfile->addr.buffer
15264 + addr_base + addr_index * addr_size);
15265 if (addr_size == 4)
15266 return bfd_get_32 (abfd, info_ptr);
15268 return bfd_get_64 (abfd, info_ptr);
15271 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
15274 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
15276 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
15279 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
15282 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
15283 unsigned int *bytes_read)
15285 bfd *abfd = cu->objfile->obfd;
15286 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
15288 return read_addr_index (cu, addr_index);
15291 /* Data structure to pass results from dwarf2_read_addr_index_reader
15292 back to dwarf2_read_addr_index. */
15294 struct dwarf2_read_addr_index_data
15296 ULONGEST addr_base;
15300 /* die_reader_func for dwarf2_read_addr_index. */
15303 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
15304 const gdb_byte *info_ptr,
15305 struct die_info *comp_unit_die,
15309 struct dwarf2_cu *cu = reader->cu;
15310 struct dwarf2_read_addr_index_data *aidata =
15311 (struct dwarf2_read_addr_index_data *) data;
15313 aidata->addr_base = cu->addr_base;
15314 aidata->addr_size = cu->header.addr_size;
15317 /* Given an index in .debug_addr, fetch the value.
15318 NOTE: This can be called during dwarf expression evaluation,
15319 long after the debug information has been read, and thus per_cu->cu
15320 may no longer exist. */
15323 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
15324 unsigned int addr_index)
15326 struct objfile *objfile = per_cu->objfile;
15327 struct dwarf2_cu *cu = per_cu->cu;
15328 ULONGEST addr_base;
15331 /* This is intended to be called from outside this file. */
15332 dw2_setup (objfile);
15334 /* We need addr_base and addr_size.
15335 If we don't have PER_CU->cu, we have to get it.
15336 Nasty, but the alternative is storing the needed info in PER_CU,
15337 which at this point doesn't seem justified: it's not clear how frequently
15338 it would get used and it would increase the size of every PER_CU.
15339 Entry points like dwarf2_per_cu_addr_size do a similar thing
15340 so we're not in uncharted territory here.
15341 Alas we need to be a bit more complicated as addr_base is contained
15344 We don't need to read the entire CU(/TU).
15345 We just need the header and top level die.
15347 IWBN to use the aging mechanism to let us lazily later discard the CU.
15348 For now we skip this optimization. */
15352 addr_base = cu->addr_base;
15353 addr_size = cu->header.addr_size;
15357 struct dwarf2_read_addr_index_data aidata;
15359 /* Note: We can't use init_cutu_and_read_dies_simple here,
15360 we need addr_base. */
15361 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
15362 dwarf2_read_addr_index_reader, &aidata);
15363 addr_base = aidata.addr_base;
15364 addr_size = aidata.addr_size;
15367 return read_addr_index_1 (addr_index, addr_base, addr_size);
15370 /* Given a DW_AT_str_index, fetch the string. */
15372 static const char *
15373 read_str_index (const struct die_reader_specs *reader,
15374 struct dwarf2_cu *cu, ULONGEST str_index)
15376 struct objfile *objfile = dwarf2_per_objfile->objfile;
15377 const char *dwo_name = objfile->name;
15378 bfd *abfd = objfile->obfd;
15379 struct dwo_sections *sections = &reader->dwo_file->sections;
15380 const gdb_byte *info_ptr;
15381 ULONGEST str_offset;
15383 dwarf2_read_section (objfile, §ions->str);
15384 dwarf2_read_section (objfile, §ions->str_offsets);
15385 if (sections->str.buffer == NULL)
15386 error (_("DW_FORM_str_index used without .debug_str.dwo section"
15387 " in CU at offset 0x%lx [in module %s]"),
15388 (long) cu->header.offset.sect_off, dwo_name);
15389 if (sections->str_offsets.buffer == NULL)
15390 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
15391 " in CU at offset 0x%lx [in module %s]"),
15392 (long) cu->header.offset.sect_off, dwo_name);
15393 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
15394 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
15395 " section in CU at offset 0x%lx [in module %s]"),
15396 (long) cu->header.offset.sect_off, dwo_name);
15397 info_ptr = (sections->str_offsets.buffer
15398 + str_index * cu->header.offset_size);
15399 if (cu->header.offset_size == 4)
15400 str_offset = bfd_get_32 (abfd, info_ptr);
15402 str_offset = bfd_get_64 (abfd, info_ptr);
15403 if (str_offset >= sections->str.size)
15404 error (_("Offset from DW_FORM_str_index pointing outside of"
15405 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
15406 (long) cu->header.offset.sect_off, dwo_name);
15407 return (const char *) (sections->str.buffer + str_offset);
15410 /* Return the length of an LEB128 number in BUF. */
15413 leb128_size (const gdb_byte *buf)
15415 const gdb_byte *begin = buf;
15421 if ((byte & 128) == 0)
15422 return buf - begin;
15427 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
15435 cu->language = language_c;
15437 case DW_LANG_C_plus_plus:
15438 cu->language = language_cplus;
15441 cu->language = language_d;
15443 case DW_LANG_Fortran77:
15444 case DW_LANG_Fortran90:
15445 case DW_LANG_Fortran95:
15446 cu->language = language_fortran;
15449 cu->language = language_go;
15451 case DW_LANG_Mips_Assembler:
15452 cu->language = language_asm;
15455 cu->language = language_java;
15457 case DW_LANG_Ada83:
15458 case DW_LANG_Ada95:
15459 cu->language = language_ada;
15461 case DW_LANG_Modula2:
15462 cu->language = language_m2;
15464 case DW_LANG_Pascal83:
15465 cu->language = language_pascal;
15468 cu->language = language_objc;
15470 case DW_LANG_Cobol74:
15471 case DW_LANG_Cobol85:
15473 cu->language = language_minimal;
15476 cu->language_defn = language_def (cu->language);
15479 /* Return the named attribute or NULL if not there. */
15481 static struct attribute *
15482 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15487 struct attribute *spec = NULL;
15489 for (i = 0; i < die->num_attrs; ++i)
15491 if (die->attrs[i].name == name)
15492 return &die->attrs[i];
15493 if (die->attrs[i].name == DW_AT_specification
15494 || die->attrs[i].name == DW_AT_abstract_origin)
15495 spec = &die->attrs[i];
15501 die = follow_die_ref (die, spec, &cu);
15507 /* Return the named attribute or NULL if not there,
15508 but do not follow DW_AT_specification, etc.
15509 This is for use in contexts where we're reading .debug_types dies.
15510 Following DW_AT_specification, DW_AT_abstract_origin will take us
15511 back up the chain, and we want to go down. */
15513 static struct attribute *
15514 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15518 for (i = 0; i < die->num_attrs; ++i)
15519 if (die->attrs[i].name == name)
15520 return &die->attrs[i];
15525 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15526 and holds a non-zero value. This function should only be used for
15527 DW_FORM_flag or DW_FORM_flag_present attributes. */
15530 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15532 struct attribute *attr = dwarf2_attr (die, name, cu);
15534 return (attr && DW_UNSND (attr));
15538 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15540 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15541 which value is non-zero. However, we have to be careful with
15542 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15543 (via dwarf2_flag_true_p) follows this attribute. So we may
15544 end up accidently finding a declaration attribute that belongs
15545 to a different DIE referenced by the specification attribute,
15546 even though the given DIE does not have a declaration attribute. */
15547 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15548 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15551 /* Return the die giving the specification for DIE, if there is
15552 one. *SPEC_CU is the CU containing DIE on input, and the CU
15553 containing the return value on output. If there is no
15554 specification, but there is an abstract origin, that is
15557 static struct die_info *
15558 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15560 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15563 if (spec_attr == NULL)
15564 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15566 if (spec_attr == NULL)
15569 return follow_die_ref (die, spec_attr, spec_cu);
15572 /* Free the line_header structure *LH, and any arrays and strings it
15574 NOTE: This is also used as a "cleanup" function. */
15577 free_line_header (struct line_header *lh)
15579 if (lh->standard_opcode_lengths)
15580 xfree (lh->standard_opcode_lengths);
15582 /* Remember that all the lh->file_names[i].name pointers are
15583 pointers into debug_line_buffer, and don't need to be freed. */
15584 if (lh->file_names)
15585 xfree (lh->file_names);
15587 /* Similarly for the include directory names. */
15588 if (lh->include_dirs)
15589 xfree (lh->include_dirs);
15594 /* Add an entry to LH's include directory table. */
15597 add_include_dir (struct line_header *lh, const char *include_dir)
15599 /* Grow the array if necessary. */
15600 if (lh->include_dirs_size == 0)
15602 lh->include_dirs_size = 1; /* for testing */
15603 lh->include_dirs = xmalloc (lh->include_dirs_size
15604 * sizeof (*lh->include_dirs));
15606 else if (lh->num_include_dirs >= lh->include_dirs_size)
15608 lh->include_dirs_size *= 2;
15609 lh->include_dirs = xrealloc (lh->include_dirs,
15610 (lh->include_dirs_size
15611 * sizeof (*lh->include_dirs)));
15614 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15617 /* Add an entry to LH's file name table. */
15620 add_file_name (struct line_header *lh,
15622 unsigned int dir_index,
15623 unsigned int mod_time,
15624 unsigned int length)
15626 struct file_entry *fe;
15628 /* Grow the array if necessary. */
15629 if (lh->file_names_size == 0)
15631 lh->file_names_size = 1; /* for testing */
15632 lh->file_names = xmalloc (lh->file_names_size
15633 * sizeof (*lh->file_names));
15635 else if (lh->num_file_names >= lh->file_names_size)
15637 lh->file_names_size *= 2;
15638 lh->file_names = xrealloc (lh->file_names,
15639 (lh->file_names_size
15640 * sizeof (*lh->file_names)));
15643 fe = &lh->file_names[lh->num_file_names++];
15645 fe->dir_index = dir_index;
15646 fe->mod_time = mod_time;
15647 fe->length = length;
15648 fe->included_p = 0;
15652 /* A convenience function to find the proper .debug_line section for a
15655 static struct dwarf2_section_info *
15656 get_debug_line_section (struct dwarf2_cu *cu)
15658 struct dwarf2_section_info *section;
15660 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15662 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15663 section = &cu->dwo_unit->dwo_file->sections.line;
15664 else if (cu->per_cu->is_dwz)
15666 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15668 section = &dwz->line;
15671 section = &dwarf2_per_objfile->line;
15676 /* Read the statement program header starting at OFFSET in
15677 .debug_line, or .debug_line.dwo. Return a pointer
15678 to a struct line_header, allocated using xmalloc.
15680 NOTE: the strings in the include directory and file name tables of
15681 the returned object point into the dwarf line section buffer,
15682 and must not be freed. */
15684 static struct line_header *
15685 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15687 struct cleanup *back_to;
15688 struct line_header *lh;
15689 const gdb_byte *line_ptr;
15690 unsigned int bytes_read, offset_size;
15692 const char *cur_dir, *cur_file;
15693 struct dwarf2_section_info *section;
15696 section = get_debug_line_section (cu);
15697 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15698 if (section->buffer == NULL)
15700 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15701 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15703 complaint (&symfile_complaints, _("missing .debug_line section"));
15707 /* We can't do this until we know the section is non-empty.
15708 Only then do we know we have such a section. */
15709 abfd = section->asection->owner;
15711 /* Make sure that at least there's room for the total_length field.
15712 That could be 12 bytes long, but we're just going to fudge that. */
15713 if (offset + 4 >= section->size)
15715 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15719 lh = xmalloc (sizeof (*lh));
15720 memset (lh, 0, sizeof (*lh));
15721 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15724 line_ptr = section->buffer + offset;
15726 /* Read in the header. */
15728 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15729 &bytes_read, &offset_size);
15730 line_ptr += bytes_read;
15731 if (line_ptr + lh->total_length > (section->buffer + section->size))
15733 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15734 do_cleanups (back_to);
15737 lh->statement_program_end = line_ptr + lh->total_length;
15738 lh->version = read_2_bytes (abfd, line_ptr);
15740 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15741 line_ptr += offset_size;
15742 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15744 if (lh->version >= 4)
15746 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15750 lh->maximum_ops_per_instruction = 1;
15752 if (lh->maximum_ops_per_instruction == 0)
15754 lh->maximum_ops_per_instruction = 1;
15755 complaint (&symfile_complaints,
15756 _("invalid maximum_ops_per_instruction "
15757 "in `.debug_line' section"));
15760 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15762 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15764 lh->line_range = read_1_byte (abfd, line_ptr);
15766 lh->opcode_base = read_1_byte (abfd, line_ptr);
15768 lh->standard_opcode_lengths
15769 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15771 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15772 for (i = 1; i < lh->opcode_base; ++i)
15774 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15778 /* Read directory table. */
15779 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15781 line_ptr += bytes_read;
15782 add_include_dir (lh, cur_dir);
15784 line_ptr += bytes_read;
15786 /* Read file name table. */
15787 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15789 unsigned int dir_index, mod_time, length;
15791 line_ptr += bytes_read;
15792 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15793 line_ptr += bytes_read;
15794 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15795 line_ptr += bytes_read;
15796 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15797 line_ptr += bytes_read;
15799 add_file_name (lh, cur_file, dir_index, mod_time, length);
15801 line_ptr += bytes_read;
15802 lh->statement_program_start = line_ptr;
15804 if (line_ptr > (section->buffer + section->size))
15805 complaint (&symfile_complaints,
15806 _("line number info header doesn't "
15807 "fit in `.debug_line' section"));
15809 discard_cleanups (back_to);
15813 /* Subroutine of dwarf_decode_lines to simplify it.
15814 Return the file name of the psymtab for included file FILE_INDEX
15815 in line header LH of PST.
15816 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15817 If space for the result is malloc'd, it will be freed by a cleanup.
15818 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15820 The function creates dangling cleanup registration. */
15822 static const char *
15823 psymtab_include_file_name (const struct line_header *lh, int file_index,
15824 const struct partial_symtab *pst,
15825 const char *comp_dir)
15827 const struct file_entry fe = lh->file_names [file_index];
15828 const char *include_name = fe.name;
15829 const char *include_name_to_compare = include_name;
15830 const char *dir_name = NULL;
15831 const char *pst_filename;
15832 char *copied_name = NULL;
15836 dir_name = lh->include_dirs[fe.dir_index - 1];
15838 if (!IS_ABSOLUTE_PATH (include_name)
15839 && (dir_name != NULL || comp_dir != NULL))
15841 /* Avoid creating a duplicate psymtab for PST.
15842 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15843 Before we do the comparison, however, we need to account
15844 for DIR_NAME and COMP_DIR.
15845 First prepend dir_name (if non-NULL). If we still don't
15846 have an absolute path prepend comp_dir (if non-NULL).
15847 However, the directory we record in the include-file's
15848 psymtab does not contain COMP_DIR (to match the
15849 corresponding symtab(s)).
15854 bash$ gcc -g ./hello.c
15855 include_name = "hello.c"
15857 DW_AT_comp_dir = comp_dir = "/tmp"
15858 DW_AT_name = "./hello.c" */
15860 if (dir_name != NULL)
15862 char *tem = concat (dir_name, SLASH_STRING,
15863 include_name, (char *)NULL);
15865 make_cleanup (xfree, tem);
15866 include_name = tem;
15867 include_name_to_compare = include_name;
15869 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15871 char *tem = concat (comp_dir, SLASH_STRING,
15872 include_name, (char *)NULL);
15874 make_cleanup (xfree, tem);
15875 include_name_to_compare = tem;
15879 pst_filename = pst->filename;
15880 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15882 copied_name = concat (pst->dirname, SLASH_STRING,
15883 pst_filename, (char *)NULL);
15884 pst_filename = copied_name;
15887 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15889 if (copied_name != NULL)
15890 xfree (copied_name);
15894 return include_name;
15897 /* Ignore this record_line request. */
15900 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15905 /* Subroutine of dwarf_decode_lines to simplify it.
15906 Process the line number information in LH. */
15909 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15910 struct dwarf2_cu *cu, struct partial_symtab *pst)
15912 const gdb_byte *line_ptr, *extended_end;
15913 const gdb_byte *line_end;
15914 unsigned int bytes_read, extended_len;
15915 unsigned char op_code, extended_op, adj_opcode;
15916 CORE_ADDR baseaddr;
15917 struct objfile *objfile = cu->objfile;
15918 bfd *abfd = objfile->obfd;
15919 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15920 const int decode_for_pst_p = (pst != NULL);
15921 struct subfile *last_subfile = NULL;
15922 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15925 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15927 line_ptr = lh->statement_program_start;
15928 line_end = lh->statement_program_end;
15930 /* Read the statement sequences until there's nothing left. */
15931 while (line_ptr < line_end)
15933 /* state machine registers */
15934 CORE_ADDR address = 0;
15935 unsigned int file = 1;
15936 unsigned int line = 1;
15937 unsigned int column = 0;
15938 int is_stmt = lh->default_is_stmt;
15939 int basic_block = 0;
15940 int end_sequence = 0;
15942 unsigned char op_index = 0;
15944 if (!decode_for_pst_p && lh->num_file_names >= file)
15946 /* Start a subfile for the current file of the state machine. */
15947 /* lh->include_dirs and lh->file_names are 0-based, but the
15948 directory and file name numbers in the statement program
15950 struct file_entry *fe = &lh->file_names[file - 1];
15951 const char *dir = NULL;
15954 dir = lh->include_dirs[fe->dir_index - 1];
15956 dwarf2_start_subfile (fe->name, dir, comp_dir);
15959 /* Decode the table. */
15960 while (!end_sequence)
15962 op_code = read_1_byte (abfd, line_ptr);
15964 if (line_ptr > line_end)
15966 dwarf2_debug_line_missing_end_sequence_complaint ();
15970 if (op_code >= lh->opcode_base)
15972 /* Special operand. */
15973 adj_opcode = op_code - lh->opcode_base;
15974 address += (((op_index + (adj_opcode / lh->line_range))
15975 / lh->maximum_ops_per_instruction)
15976 * lh->minimum_instruction_length);
15977 op_index = ((op_index + (adj_opcode / lh->line_range))
15978 % lh->maximum_ops_per_instruction);
15979 line += lh->line_base + (adj_opcode % lh->line_range);
15980 if (lh->num_file_names < file || file == 0)
15981 dwarf2_debug_line_missing_file_complaint ();
15982 /* For now we ignore lines not starting on an
15983 instruction boundary. */
15984 else if (op_index == 0)
15986 lh->file_names[file - 1].included_p = 1;
15987 if (!decode_for_pst_p && is_stmt)
15989 if (last_subfile != current_subfile)
15991 addr = gdbarch_addr_bits_remove (gdbarch, address);
15993 (*p_record_line) (last_subfile, 0, addr);
15994 last_subfile = current_subfile;
15996 /* Append row to matrix using current values. */
15997 addr = gdbarch_addr_bits_remove (gdbarch, address);
15998 (*p_record_line) (current_subfile, line, addr);
16003 else switch (op_code)
16005 case DW_LNS_extended_op:
16006 extended_len = read_unsigned_leb128 (abfd, line_ptr,
16008 line_ptr += bytes_read;
16009 extended_end = line_ptr + extended_len;
16010 extended_op = read_1_byte (abfd, line_ptr);
16012 switch (extended_op)
16014 case DW_LNE_end_sequence:
16015 p_record_line = record_line;
16018 case DW_LNE_set_address:
16019 address = read_address (abfd, line_ptr, cu, &bytes_read);
16021 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
16023 /* This line table is for a function which has been
16024 GCd by the linker. Ignore it. PR gdb/12528 */
16027 = line_ptr - get_debug_line_section (cu)->buffer;
16029 complaint (&symfile_complaints,
16030 _(".debug_line address at offset 0x%lx is 0 "
16032 line_offset, objfile->name);
16033 p_record_line = noop_record_line;
16037 line_ptr += bytes_read;
16038 address += baseaddr;
16040 case DW_LNE_define_file:
16042 const char *cur_file;
16043 unsigned int dir_index, mod_time, length;
16045 cur_file = read_direct_string (abfd, line_ptr,
16047 line_ptr += bytes_read;
16049 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16050 line_ptr += bytes_read;
16052 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16053 line_ptr += bytes_read;
16055 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16056 line_ptr += bytes_read;
16057 add_file_name (lh, cur_file, dir_index, mod_time, length);
16060 case DW_LNE_set_discriminator:
16061 /* The discriminator is not interesting to the debugger;
16063 line_ptr = extended_end;
16066 complaint (&symfile_complaints,
16067 _("mangled .debug_line section"));
16070 /* Make sure that we parsed the extended op correctly. If e.g.
16071 we expected a different address size than the producer used,
16072 we may have read the wrong number of bytes. */
16073 if (line_ptr != extended_end)
16075 complaint (&symfile_complaints,
16076 _("mangled .debug_line section"));
16081 if (lh->num_file_names < file || file == 0)
16082 dwarf2_debug_line_missing_file_complaint ();
16085 lh->file_names[file - 1].included_p = 1;
16086 if (!decode_for_pst_p && is_stmt)
16088 if (last_subfile != current_subfile)
16090 addr = gdbarch_addr_bits_remove (gdbarch, address);
16092 (*p_record_line) (last_subfile, 0, addr);
16093 last_subfile = current_subfile;
16095 addr = gdbarch_addr_bits_remove (gdbarch, address);
16096 (*p_record_line) (current_subfile, line, addr);
16101 case DW_LNS_advance_pc:
16104 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16106 address += (((op_index + adjust)
16107 / lh->maximum_ops_per_instruction)
16108 * lh->minimum_instruction_length);
16109 op_index = ((op_index + adjust)
16110 % lh->maximum_ops_per_instruction);
16111 line_ptr += bytes_read;
16114 case DW_LNS_advance_line:
16115 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
16116 line_ptr += bytes_read;
16118 case DW_LNS_set_file:
16120 /* The arrays lh->include_dirs and lh->file_names are
16121 0-based, but the directory and file name numbers in
16122 the statement program are 1-based. */
16123 struct file_entry *fe;
16124 const char *dir = NULL;
16126 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16127 line_ptr += bytes_read;
16128 if (lh->num_file_names < file || file == 0)
16129 dwarf2_debug_line_missing_file_complaint ();
16132 fe = &lh->file_names[file - 1];
16134 dir = lh->include_dirs[fe->dir_index - 1];
16135 if (!decode_for_pst_p)
16137 last_subfile = current_subfile;
16138 dwarf2_start_subfile (fe->name, dir, comp_dir);
16143 case DW_LNS_set_column:
16144 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16145 line_ptr += bytes_read;
16147 case DW_LNS_negate_stmt:
16148 is_stmt = (!is_stmt);
16150 case DW_LNS_set_basic_block:
16153 /* Add to the address register of the state machine the
16154 address increment value corresponding to special opcode
16155 255. I.e., this value is scaled by the minimum
16156 instruction length since special opcode 255 would have
16157 scaled the increment. */
16158 case DW_LNS_const_add_pc:
16160 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
16162 address += (((op_index + adjust)
16163 / lh->maximum_ops_per_instruction)
16164 * lh->minimum_instruction_length);
16165 op_index = ((op_index + adjust)
16166 % lh->maximum_ops_per_instruction);
16169 case DW_LNS_fixed_advance_pc:
16170 address += read_2_bytes (abfd, line_ptr);
16176 /* Unknown standard opcode, ignore it. */
16179 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
16181 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16182 line_ptr += bytes_read;
16187 if (lh->num_file_names < file || file == 0)
16188 dwarf2_debug_line_missing_file_complaint ();
16191 lh->file_names[file - 1].included_p = 1;
16192 if (!decode_for_pst_p)
16194 addr = gdbarch_addr_bits_remove (gdbarch, address);
16195 (*p_record_line) (current_subfile, 0, addr);
16201 /* Decode the Line Number Program (LNP) for the given line_header
16202 structure and CU. The actual information extracted and the type
16203 of structures created from the LNP depends on the value of PST.
16205 1. If PST is NULL, then this procedure uses the data from the program
16206 to create all necessary symbol tables, and their linetables.
16208 2. If PST is not NULL, this procedure reads the program to determine
16209 the list of files included by the unit represented by PST, and
16210 builds all the associated partial symbol tables.
16212 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16213 It is used for relative paths in the line table.
16214 NOTE: When processing partial symtabs (pst != NULL),
16215 comp_dir == pst->dirname.
16217 NOTE: It is important that psymtabs have the same file name (via strcmp)
16218 as the corresponding symtab. Since COMP_DIR is not used in the name of the
16219 symtab we don't use it in the name of the psymtabs we create.
16220 E.g. expand_line_sal requires this when finding psymtabs to expand.
16221 A good testcase for this is mb-inline.exp. */
16224 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
16225 struct dwarf2_cu *cu, struct partial_symtab *pst,
16226 int want_line_info)
16228 struct objfile *objfile = cu->objfile;
16229 const int decode_for_pst_p = (pst != NULL);
16230 struct subfile *first_subfile = current_subfile;
16232 if (want_line_info)
16233 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
16235 if (decode_for_pst_p)
16239 /* Now that we're done scanning the Line Header Program, we can
16240 create the psymtab of each included file. */
16241 for (file_index = 0; file_index < lh->num_file_names; file_index++)
16242 if (lh->file_names[file_index].included_p == 1)
16244 const char *include_name =
16245 psymtab_include_file_name (lh, file_index, pst, comp_dir);
16246 if (include_name != NULL)
16247 dwarf2_create_include_psymtab (include_name, pst, objfile);
16252 /* Make sure a symtab is created for every file, even files
16253 which contain only variables (i.e. no code with associated
16257 for (i = 0; i < lh->num_file_names; i++)
16259 const char *dir = NULL;
16260 struct file_entry *fe;
16262 fe = &lh->file_names[i];
16264 dir = lh->include_dirs[fe->dir_index - 1];
16265 dwarf2_start_subfile (fe->name, dir, comp_dir);
16267 /* Skip the main file; we don't need it, and it must be
16268 allocated last, so that it will show up before the
16269 non-primary symtabs in the objfile's symtab list. */
16270 if (current_subfile == first_subfile)
16273 if (current_subfile->symtab == NULL)
16274 current_subfile->symtab = allocate_symtab (current_subfile->name,
16276 fe->symtab = current_subfile->symtab;
16281 /* Start a subfile for DWARF. FILENAME is the name of the file and
16282 DIRNAME the name of the source directory which contains FILENAME
16283 or NULL if not known. COMP_DIR is the compilation directory for the
16284 linetable's compilation unit or NULL if not known.
16285 This routine tries to keep line numbers from identical absolute and
16286 relative file names in a common subfile.
16288 Using the `list' example from the GDB testsuite, which resides in
16289 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
16290 of /srcdir/list0.c yields the following debugging information for list0.c:
16292 DW_AT_name: /srcdir/list0.c
16293 DW_AT_comp_dir: /compdir
16294 files.files[0].name: list0.h
16295 files.files[0].dir: /srcdir
16296 files.files[1].name: list0.c
16297 files.files[1].dir: /srcdir
16299 The line number information for list0.c has to end up in a single
16300 subfile, so that `break /srcdir/list0.c:1' works as expected.
16301 start_subfile will ensure that this happens provided that we pass the
16302 concatenation of files.files[1].dir and files.files[1].name as the
16306 dwarf2_start_subfile (const char *filename, const char *dirname,
16307 const char *comp_dir)
16311 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
16312 `start_symtab' will always pass the contents of DW_AT_comp_dir as
16313 second argument to start_subfile. To be consistent, we do the
16314 same here. In order not to lose the line information directory,
16315 we concatenate it to the filename when it makes sense.
16316 Note that the Dwarf3 standard says (speaking of filenames in line
16317 information): ``The directory index is ignored for file names
16318 that represent full path names''. Thus ignoring dirname in the
16319 `else' branch below isn't an issue. */
16321 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
16323 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
16327 start_subfile (filename, comp_dir);
16333 /* Start a symtab for DWARF.
16334 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
16337 dwarf2_start_symtab (struct dwarf2_cu *cu,
16338 const char *name, const char *comp_dir, CORE_ADDR low_pc)
16340 start_symtab (name, comp_dir, low_pc);
16341 record_debugformat ("DWARF 2");
16342 record_producer (cu->producer);
16344 /* We assume that we're processing GCC output. */
16345 processing_gcc_compilation = 2;
16347 cu->processing_has_namespace_info = 0;
16351 var_decode_location (struct attribute *attr, struct symbol *sym,
16352 struct dwarf2_cu *cu)
16354 struct objfile *objfile = cu->objfile;
16355 struct comp_unit_head *cu_header = &cu->header;
16357 /* NOTE drow/2003-01-30: There used to be a comment and some special
16358 code here to turn a symbol with DW_AT_external and a
16359 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
16360 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
16361 with some versions of binutils) where shared libraries could have
16362 relocations against symbols in their debug information - the
16363 minimal symbol would have the right address, but the debug info
16364 would not. It's no longer necessary, because we will explicitly
16365 apply relocations when we read in the debug information now. */
16367 /* A DW_AT_location attribute with no contents indicates that a
16368 variable has been optimized away. */
16369 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
16371 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16375 /* Handle one degenerate form of location expression specially, to
16376 preserve GDB's previous behavior when section offsets are
16377 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
16378 then mark this symbol as LOC_STATIC. */
16380 if (attr_form_is_block (attr)
16381 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
16382 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
16383 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
16384 && (DW_BLOCK (attr)->size
16385 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
16387 unsigned int dummy;
16389 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
16390 SYMBOL_VALUE_ADDRESS (sym) =
16391 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
16393 SYMBOL_VALUE_ADDRESS (sym) =
16394 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
16395 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
16396 fixup_symbol_section (sym, objfile);
16397 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
16398 SYMBOL_SECTION (sym));
16402 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
16403 expression evaluator, and use LOC_COMPUTED only when necessary
16404 (i.e. when the value of a register or memory location is
16405 referenced, or a thread-local block, etc.). Then again, it might
16406 not be worthwhile. I'm assuming that it isn't unless performance
16407 or memory numbers show me otherwise. */
16409 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
16411 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
16412 cu->has_loclist = 1;
16415 /* Given a pointer to a DWARF information entry, figure out if we need
16416 to make a symbol table entry for it, and if so, create a new entry
16417 and return a pointer to it.
16418 If TYPE is NULL, determine symbol type from the die, otherwise
16419 used the passed type.
16420 If SPACE is not NULL, use it to hold the new symbol. If it is
16421 NULL, allocate a new symbol on the objfile's obstack. */
16423 static struct symbol *
16424 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
16425 struct symbol *space)
16427 struct objfile *objfile = cu->objfile;
16428 struct symbol *sym = NULL;
16430 struct attribute *attr = NULL;
16431 struct attribute *attr2 = NULL;
16432 CORE_ADDR baseaddr;
16433 struct pending **list_to_add = NULL;
16435 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
16437 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
16439 name = dwarf2_name (die, cu);
16442 const char *linkagename;
16443 int suppress_add = 0;
16448 sym = allocate_symbol (objfile);
16449 OBJSTAT (objfile, n_syms++);
16451 /* Cache this symbol's name and the name's demangled form (if any). */
16452 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
16453 linkagename = dwarf2_physname (name, die, cu);
16454 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
16456 /* Fortran does not have mangling standard and the mangling does differ
16457 between gfortran, iFort etc. */
16458 if (cu->language == language_fortran
16459 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
16460 symbol_set_demangled_name (&(sym->ginfo),
16461 dwarf2_full_name (name, die, cu),
16464 /* Default assumptions.
16465 Use the passed type or decode it from the die. */
16466 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16467 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16469 SYMBOL_TYPE (sym) = type;
16471 SYMBOL_TYPE (sym) = die_type (die, cu);
16472 attr = dwarf2_attr (die,
16473 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16477 SYMBOL_LINE (sym) = DW_UNSND (attr);
16480 attr = dwarf2_attr (die,
16481 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16485 int file_index = DW_UNSND (attr);
16487 if (cu->line_header == NULL
16488 || file_index > cu->line_header->num_file_names)
16489 complaint (&symfile_complaints,
16490 _("file index out of range"));
16491 else if (file_index > 0)
16493 struct file_entry *fe;
16495 fe = &cu->line_header->file_names[file_index - 1];
16496 SYMBOL_SYMTAB (sym) = fe->symtab;
16503 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16506 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16508 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16509 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16510 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16511 add_symbol_to_list (sym, cu->list_in_scope);
16513 case DW_TAG_subprogram:
16514 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16516 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16517 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16518 if ((attr2 && (DW_UNSND (attr2) != 0))
16519 || cu->language == language_ada)
16521 /* Subprograms marked external are stored as a global symbol.
16522 Ada subprograms, whether marked external or not, are always
16523 stored as a global symbol, because we want to be able to
16524 access them globally. For instance, we want to be able
16525 to break on a nested subprogram without having to
16526 specify the context. */
16527 list_to_add = &global_symbols;
16531 list_to_add = cu->list_in_scope;
16534 case DW_TAG_inlined_subroutine:
16535 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16537 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16538 SYMBOL_INLINED (sym) = 1;
16539 list_to_add = cu->list_in_scope;
16541 case DW_TAG_template_value_param:
16543 /* Fall through. */
16544 case DW_TAG_constant:
16545 case DW_TAG_variable:
16546 case DW_TAG_member:
16547 /* Compilation with minimal debug info may result in
16548 variables with missing type entries. Change the
16549 misleading `void' type to something sensible. */
16550 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16552 = objfile_type (objfile)->nodebug_data_symbol;
16554 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16555 /* In the case of DW_TAG_member, we should only be called for
16556 static const members. */
16557 if (die->tag == DW_TAG_member)
16559 /* dwarf2_add_field uses die_is_declaration,
16560 so we do the same. */
16561 gdb_assert (die_is_declaration (die, cu));
16566 dwarf2_const_value (attr, sym, cu);
16567 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16570 if (attr2 && (DW_UNSND (attr2) != 0))
16571 list_to_add = &global_symbols;
16573 list_to_add = cu->list_in_scope;
16577 attr = dwarf2_attr (die, DW_AT_location, cu);
16580 var_decode_location (attr, sym, cu);
16581 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16583 /* Fortran explicitly imports any global symbols to the local
16584 scope by DW_TAG_common_block. */
16585 if (cu->language == language_fortran && die->parent
16586 && die->parent->tag == DW_TAG_common_block)
16589 if (SYMBOL_CLASS (sym) == LOC_STATIC
16590 && SYMBOL_VALUE_ADDRESS (sym) == 0
16591 && !dwarf2_per_objfile->has_section_at_zero)
16593 /* When a static variable is eliminated by the linker,
16594 the corresponding debug information is not stripped
16595 out, but the variable address is set to null;
16596 do not add such variables into symbol table. */
16598 else if (attr2 && (DW_UNSND (attr2) != 0))
16600 /* Workaround gfortran PR debug/40040 - it uses
16601 DW_AT_location for variables in -fPIC libraries which may
16602 get overriden by other libraries/executable and get
16603 a different address. Resolve it by the minimal symbol
16604 which may come from inferior's executable using copy
16605 relocation. Make this workaround only for gfortran as for
16606 other compilers GDB cannot guess the minimal symbol
16607 Fortran mangling kind. */
16608 if (cu->language == language_fortran && die->parent
16609 && die->parent->tag == DW_TAG_module
16611 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16612 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16614 /* A variable with DW_AT_external is never static,
16615 but it may be block-scoped. */
16616 list_to_add = (cu->list_in_scope == &file_symbols
16617 ? &global_symbols : cu->list_in_scope);
16620 list_to_add = cu->list_in_scope;
16624 /* We do not know the address of this symbol.
16625 If it is an external symbol and we have type information
16626 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16627 The address of the variable will then be determined from
16628 the minimal symbol table whenever the variable is
16630 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16632 /* Fortran explicitly imports any global symbols to the local
16633 scope by DW_TAG_common_block. */
16634 if (cu->language == language_fortran && die->parent
16635 && die->parent->tag == DW_TAG_common_block)
16637 /* SYMBOL_CLASS doesn't matter here because
16638 read_common_block is going to reset it. */
16640 list_to_add = cu->list_in_scope;
16642 else if (attr2 && (DW_UNSND (attr2) != 0)
16643 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16645 /* A variable with DW_AT_external is never static, but it
16646 may be block-scoped. */
16647 list_to_add = (cu->list_in_scope == &file_symbols
16648 ? &global_symbols : cu->list_in_scope);
16650 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16652 else if (!die_is_declaration (die, cu))
16654 /* Use the default LOC_OPTIMIZED_OUT class. */
16655 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16657 list_to_add = cu->list_in_scope;
16661 case DW_TAG_formal_parameter:
16662 /* If we are inside a function, mark this as an argument. If
16663 not, we might be looking at an argument to an inlined function
16664 when we do not have enough information to show inlined frames;
16665 pretend it's a local variable in that case so that the user can
16667 if (context_stack_depth > 0
16668 && context_stack[context_stack_depth - 1].name != NULL)
16669 SYMBOL_IS_ARGUMENT (sym) = 1;
16670 attr = dwarf2_attr (die, DW_AT_location, cu);
16673 var_decode_location (attr, sym, cu);
16675 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16678 dwarf2_const_value (attr, sym, cu);
16681 list_to_add = cu->list_in_scope;
16683 case DW_TAG_unspecified_parameters:
16684 /* From varargs functions; gdb doesn't seem to have any
16685 interest in this information, so just ignore it for now.
16688 case DW_TAG_template_type_param:
16690 /* Fall through. */
16691 case DW_TAG_class_type:
16692 case DW_TAG_interface_type:
16693 case DW_TAG_structure_type:
16694 case DW_TAG_union_type:
16695 case DW_TAG_set_type:
16696 case DW_TAG_enumeration_type:
16697 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16698 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16701 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16702 really ever be static objects: otherwise, if you try
16703 to, say, break of a class's method and you're in a file
16704 which doesn't mention that class, it won't work unless
16705 the check for all static symbols in lookup_symbol_aux
16706 saves you. See the OtherFileClass tests in
16707 gdb.c++/namespace.exp. */
16711 list_to_add = (cu->list_in_scope == &file_symbols
16712 && (cu->language == language_cplus
16713 || cu->language == language_java)
16714 ? &global_symbols : cu->list_in_scope);
16716 /* The semantics of C++ state that "struct foo {
16717 ... }" also defines a typedef for "foo". A Java
16718 class declaration also defines a typedef for the
16720 if (cu->language == language_cplus
16721 || cu->language == language_java
16722 || cu->language == language_ada)
16724 /* The symbol's name is already allocated along
16725 with this objfile, so we don't need to
16726 duplicate it for the type. */
16727 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16728 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16733 case DW_TAG_typedef:
16734 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16735 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16736 list_to_add = cu->list_in_scope;
16738 case DW_TAG_base_type:
16739 case DW_TAG_subrange_type:
16740 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16741 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16742 list_to_add = cu->list_in_scope;
16744 case DW_TAG_enumerator:
16745 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16748 dwarf2_const_value (attr, sym, cu);
16751 /* NOTE: carlton/2003-11-10: See comment above in the
16752 DW_TAG_class_type, etc. block. */
16754 list_to_add = (cu->list_in_scope == &file_symbols
16755 && (cu->language == language_cplus
16756 || cu->language == language_java)
16757 ? &global_symbols : cu->list_in_scope);
16760 case DW_TAG_namespace:
16761 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16762 list_to_add = &global_symbols;
16764 case DW_TAG_common_block:
16765 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16766 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16767 add_symbol_to_list (sym, cu->list_in_scope);
16770 /* Not a tag we recognize. Hopefully we aren't processing
16771 trash data, but since we must specifically ignore things
16772 we don't recognize, there is nothing else we should do at
16774 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16775 dwarf_tag_name (die->tag));
16781 sym->hash_next = objfile->template_symbols;
16782 objfile->template_symbols = sym;
16783 list_to_add = NULL;
16786 if (list_to_add != NULL)
16787 add_symbol_to_list (sym, list_to_add);
16789 /* For the benefit of old versions of GCC, check for anonymous
16790 namespaces based on the demangled name. */
16791 if (!cu->processing_has_namespace_info
16792 && cu->language == language_cplus)
16793 cp_scan_for_anonymous_namespaces (sym, objfile);
16798 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16800 static struct symbol *
16801 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16803 return new_symbol_full (die, type, cu, NULL);
16806 /* Given an attr with a DW_FORM_dataN value in host byte order,
16807 zero-extend it as appropriate for the symbol's type. The DWARF
16808 standard (v4) is not entirely clear about the meaning of using
16809 DW_FORM_dataN for a constant with a signed type, where the type is
16810 wider than the data. The conclusion of a discussion on the DWARF
16811 list was that this is unspecified. We choose to always zero-extend
16812 because that is the interpretation long in use by GCC. */
16815 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
16816 struct dwarf2_cu *cu, LONGEST *value, int bits)
16818 struct objfile *objfile = cu->objfile;
16819 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16820 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16821 LONGEST l = DW_UNSND (attr);
16823 if (bits < sizeof (*value) * 8)
16825 l &= ((LONGEST) 1 << bits) - 1;
16828 else if (bits == sizeof (*value) * 8)
16832 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16833 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16840 /* Read a constant value from an attribute. Either set *VALUE, or if
16841 the value does not fit in *VALUE, set *BYTES - either already
16842 allocated on the objfile obstack, or newly allocated on OBSTACK,
16843 or, set *BATON, if we translated the constant to a location
16847 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
16848 const char *name, struct obstack *obstack,
16849 struct dwarf2_cu *cu,
16850 LONGEST *value, const gdb_byte **bytes,
16851 struct dwarf2_locexpr_baton **baton)
16853 struct objfile *objfile = cu->objfile;
16854 struct comp_unit_head *cu_header = &cu->header;
16855 struct dwarf_block *blk;
16856 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16857 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16863 switch (attr->form)
16866 case DW_FORM_GNU_addr_index:
16870 if (TYPE_LENGTH (type) != cu_header->addr_size)
16871 dwarf2_const_value_length_mismatch_complaint (name,
16872 cu_header->addr_size,
16873 TYPE_LENGTH (type));
16874 /* Symbols of this form are reasonably rare, so we just
16875 piggyback on the existing location code rather than writing
16876 a new implementation of symbol_computed_ops. */
16877 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
16878 (*baton)->per_cu = cu->per_cu;
16879 gdb_assert ((*baton)->per_cu);
16881 (*baton)->size = 2 + cu_header->addr_size;
16882 data = obstack_alloc (obstack, (*baton)->size);
16883 (*baton)->data = data;
16885 data[0] = DW_OP_addr;
16886 store_unsigned_integer (&data[1], cu_header->addr_size,
16887 byte_order, DW_ADDR (attr));
16888 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16891 case DW_FORM_string:
16893 case DW_FORM_GNU_str_index:
16894 case DW_FORM_GNU_strp_alt:
16895 /* DW_STRING is already allocated on the objfile obstack, point
16897 *bytes = (const gdb_byte *) DW_STRING (attr);
16899 case DW_FORM_block1:
16900 case DW_FORM_block2:
16901 case DW_FORM_block4:
16902 case DW_FORM_block:
16903 case DW_FORM_exprloc:
16904 blk = DW_BLOCK (attr);
16905 if (TYPE_LENGTH (type) != blk->size)
16906 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16907 TYPE_LENGTH (type));
16908 *bytes = blk->data;
16911 /* The DW_AT_const_value attributes are supposed to carry the
16912 symbol's value "represented as it would be on the target
16913 architecture." By the time we get here, it's already been
16914 converted to host endianness, so we just need to sign- or
16915 zero-extend it as appropriate. */
16916 case DW_FORM_data1:
16917 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
16919 case DW_FORM_data2:
16920 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
16922 case DW_FORM_data4:
16923 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
16925 case DW_FORM_data8:
16926 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
16929 case DW_FORM_sdata:
16930 *value = DW_SND (attr);
16933 case DW_FORM_udata:
16934 *value = DW_UNSND (attr);
16938 complaint (&symfile_complaints,
16939 _("unsupported const value attribute form: '%s'"),
16940 dwarf_form_name (attr->form));
16947 /* Copy constant value from an attribute to a symbol. */
16950 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
16951 struct dwarf2_cu *cu)
16953 struct objfile *objfile = cu->objfile;
16954 struct comp_unit_head *cu_header = &cu->header;
16956 const gdb_byte *bytes;
16957 struct dwarf2_locexpr_baton *baton;
16959 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16960 SYMBOL_PRINT_NAME (sym),
16961 &objfile->objfile_obstack, cu,
16962 &value, &bytes, &baton);
16966 SYMBOL_LOCATION_BATON (sym) = baton;
16967 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16969 else if (bytes != NULL)
16971 SYMBOL_VALUE_BYTES (sym) = bytes;
16972 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16976 SYMBOL_VALUE (sym) = value;
16977 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16981 /* Return the type of the die in question using its DW_AT_type attribute. */
16983 static struct type *
16984 die_type (struct die_info *die, struct dwarf2_cu *cu)
16986 struct attribute *type_attr;
16988 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16991 /* A missing DW_AT_type represents a void type. */
16992 return objfile_type (cu->objfile)->builtin_void;
16995 return lookup_die_type (die, type_attr, cu);
16998 /* True iff CU's producer generates GNAT Ada auxiliary information
16999 that allows to find parallel types through that information instead
17000 of having to do expensive parallel lookups by type name. */
17003 need_gnat_info (struct dwarf2_cu *cu)
17005 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
17006 of GNAT produces this auxiliary information, without any indication
17007 that it is produced. Part of enhancing the FSF version of GNAT
17008 to produce that information will be to put in place an indicator
17009 that we can use in order to determine whether the descriptive type
17010 info is available or not. One suggestion that has been made is
17011 to use a new attribute, attached to the CU die. For now, assume
17012 that the descriptive type info is not available. */
17016 /* Return the auxiliary type of the die in question using its
17017 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
17018 attribute is not present. */
17020 static struct type *
17021 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
17023 struct attribute *type_attr;
17025 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
17029 return lookup_die_type (die, type_attr, cu);
17032 /* If DIE has a descriptive_type attribute, then set the TYPE's
17033 descriptive type accordingly. */
17036 set_descriptive_type (struct type *type, struct die_info *die,
17037 struct dwarf2_cu *cu)
17039 struct type *descriptive_type = die_descriptive_type (die, cu);
17041 if (descriptive_type)
17043 ALLOCATE_GNAT_AUX_TYPE (type);
17044 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
17048 /* Return the containing type of the die in question using its
17049 DW_AT_containing_type attribute. */
17051 static struct type *
17052 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
17054 struct attribute *type_attr;
17056 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
17058 error (_("Dwarf Error: Problem turning containing type into gdb type "
17059 "[in module %s]"), cu->objfile->name);
17061 return lookup_die_type (die, type_attr, cu);
17064 /* Return an error marker type to use for the ill formed type in DIE/CU. */
17066 static struct type *
17067 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
17069 struct objfile *objfile = dwarf2_per_objfile->objfile;
17070 char *message, *saved;
17072 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
17074 cu->header.offset.sect_off,
17075 die->offset.sect_off);
17076 saved = obstack_copy0 (&objfile->objfile_obstack,
17077 message, strlen (message));
17080 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
17083 /* Look up the type of DIE in CU using its type attribute ATTR.
17084 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
17085 DW_AT_containing_type.
17086 If there is no type substitute an error marker. */
17088 static struct type *
17089 lookup_die_type (struct die_info *die, const struct attribute *attr,
17090 struct dwarf2_cu *cu)
17092 struct objfile *objfile = cu->objfile;
17093 struct type *this_type;
17095 gdb_assert (attr->name == DW_AT_type
17096 || attr->name == DW_AT_GNAT_descriptive_type
17097 || attr->name == DW_AT_containing_type);
17099 /* First see if we have it cached. */
17101 if (attr->form == DW_FORM_GNU_ref_alt)
17103 struct dwarf2_per_cu_data *per_cu;
17104 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17106 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
17107 this_type = get_die_type_at_offset (offset, per_cu);
17109 else if (attr_form_is_ref (attr))
17111 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17113 this_type = get_die_type_at_offset (offset, cu->per_cu);
17115 else if (attr->form == DW_FORM_ref_sig8)
17117 ULONGEST signature = DW_SIGNATURE (attr);
17119 return get_signatured_type (die, signature, cu);
17123 complaint (&symfile_complaints,
17124 _("Dwarf Error: Bad type attribute %s in DIE"
17125 " at 0x%x [in module %s]"),
17126 dwarf_attr_name (attr->name), die->offset.sect_off,
17128 return build_error_marker_type (cu, die);
17131 /* If not cached we need to read it in. */
17133 if (this_type == NULL)
17135 struct die_info *type_die = NULL;
17136 struct dwarf2_cu *type_cu = cu;
17138 if (attr_form_is_ref (attr))
17139 type_die = follow_die_ref (die, attr, &type_cu);
17140 if (type_die == NULL)
17141 return build_error_marker_type (cu, die);
17142 /* If we find the type now, it's probably because the type came
17143 from an inter-CU reference and the type's CU got expanded before
17145 this_type = read_type_die (type_die, type_cu);
17148 /* If we still don't have a type use an error marker. */
17150 if (this_type == NULL)
17151 return build_error_marker_type (cu, die);
17156 /* Return the type in DIE, CU.
17157 Returns NULL for invalid types.
17159 This first does a lookup in die_type_hash,
17160 and only reads the die in if necessary.
17162 NOTE: This can be called when reading in partial or full symbols. */
17164 static struct type *
17165 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
17167 struct type *this_type;
17169 this_type = get_die_type (die, cu);
17173 return read_type_die_1 (die, cu);
17176 /* Read the type in DIE, CU.
17177 Returns NULL for invalid types. */
17179 static struct type *
17180 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
17182 struct type *this_type = NULL;
17186 case DW_TAG_class_type:
17187 case DW_TAG_interface_type:
17188 case DW_TAG_structure_type:
17189 case DW_TAG_union_type:
17190 this_type = read_structure_type (die, cu);
17192 case DW_TAG_enumeration_type:
17193 this_type = read_enumeration_type (die, cu);
17195 case DW_TAG_subprogram:
17196 case DW_TAG_subroutine_type:
17197 case DW_TAG_inlined_subroutine:
17198 this_type = read_subroutine_type (die, cu);
17200 case DW_TAG_array_type:
17201 this_type = read_array_type (die, cu);
17203 case DW_TAG_set_type:
17204 this_type = read_set_type (die, cu);
17206 case DW_TAG_pointer_type:
17207 this_type = read_tag_pointer_type (die, cu);
17209 case DW_TAG_ptr_to_member_type:
17210 this_type = read_tag_ptr_to_member_type (die, cu);
17212 case DW_TAG_reference_type:
17213 this_type = read_tag_reference_type (die, cu);
17215 case DW_TAG_const_type:
17216 this_type = read_tag_const_type (die, cu);
17218 case DW_TAG_volatile_type:
17219 this_type = read_tag_volatile_type (die, cu);
17221 case DW_TAG_restrict_type:
17222 this_type = read_tag_restrict_type (die, cu);
17224 case DW_TAG_string_type:
17225 this_type = read_tag_string_type (die, cu);
17227 case DW_TAG_typedef:
17228 this_type = read_typedef (die, cu);
17230 case DW_TAG_subrange_type:
17231 this_type = read_subrange_type (die, cu);
17233 case DW_TAG_base_type:
17234 this_type = read_base_type (die, cu);
17236 case DW_TAG_unspecified_type:
17237 this_type = read_unspecified_type (die, cu);
17239 case DW_TAG_namespace:
17240 this_type = read_namespace_type (die, cu);
17242 case DW_TAG_module:
17243 this_type = read_module_type (die, cu);
17246 complaint (&symfile_complaints,
17247 _("unexpected tag in read_type_die: '%s'"),
17248 dwarf_tag_name (die->tag));
17255 /* See if we can figure out if the class lives in a namespace. We do
17256 this by looking for a member function; its demangled name will
17257 contain namespace info, if there is any.
17258 Return the computed name or NULL.
17259 Space for the result is allocated on the objfile's obstack.
17260 This is the full-die version of guess_partial_die_structure_name.
17261 In this case we know DIE has no useful parent. */
17264 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
17266 struct die_info *spec_die;
17267 struct dwarf2_cu *spec_cu;
17268 struct die_info *child;
17271 spec_die = die_specification (die, &spec_cu);
17272 if (spec_die != NULL)
17278 for (child = die->child;
17280 child = child->sibling)
17282 if (child->tag == DW_TAG_subprogram)
17284 struct attribute *attr;
17286 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
17288 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
17292 = language_class_name_from_physname (cu->language_defn,
17296 if (actual_name != NULL)
17298 const char *die_name = dwarf2_name (die, cu);
17300 if (die_name != NULL
17301 && strcmp (die_name, actual_name) != 0)
17303 /* Strip off the class name from the full name.
17304 We want the prefix. */
17305 int die_name_len = strlen (die_name);
17306 int actual_name_len = strlen (actual_name);
17308 /* Test for '::' as a sanity check. */
17309 if (actual_name_len > die_name_len + 2
17310 && actual_name[actual_name_len
17311 - die_name_len - 1] == ':')
17313 obstack_copy0 (&cu->objfile->objfile_obstack,
17315 actual_name_len - die_name_len - 2);
17318 xfree (actual_name);
17327 /* GCC might emit a nameless typedef that has a linkage name. Determine the
17328 prefix part in such case. See
17329 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17332 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
17334 struct attribute *attr;
17337 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
17338 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
17341 attr = dwarf2_attr (die, DW_AT_name, cu);
17342 if (attr != NULL && DW_STRING (attr) != NULL)
17345 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17347 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17348 if (attr == NULL || DW_STRING (attr) == NULL)
17351 /* dwarf2_name had to be already called. */
17352 gdb_assert (DW_STRING_IS_CANONICAL (attr));
17354 /* Strip the base name, keep any leading namespaces/classes. */
17355 base = strrchr (DW_STRING (attr), ':');
17356 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
17359 return obstack_copy0 (&cu->objfile->objfile_obstack,
17360 DW_STRING (attr), &base[-1] - DW_STRING (attr));
17363 /* Return the name of the namespace/class that DIE is defined within,
17364 or "" if we can't tell. The caller should not xfree the result.
17366 For example, if we're within the method foo() in the following
17376 then determine_prefix on foo's die will return "N::C". */
17378 static const char *
17379 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
17381 struct die_info *parent, *spec_die;
17382 struct dwarf2_cu *spec_cu;
17383 struct type *parent_type;
17386 if (cu->language != language_cplus && cu->language != language_java
17387 && cu->language != language_fortran)
17390 retval = anonymous_struct_prefix (die, cu);
17394 /* We have to be careful in the presence of DW_AT_specification.
17395 For example, with GCC 3.4, given the code
17399 // Definition of N::foo.
17403 then we'll have a tree of DIEs like this:
17405 1: DW_TAG_compile_unit
17406 2: DW_TAG_namespace // N
17407 3: DW_TAG_subprogram // declaration of N::foo
17408 4: DW_TAG_subprogram // definition of N::foo
17409 DW_AT_specification // refers to die #3
17411 Thus, when processing die #4, we have to pretend that we're in
17412 the context of its DW_AT_specification, namely the contex of die
17415 spec_die = die_specification (die, &spec_cu);
17416 if (spec_die == NULL)
17417 parent = die->parent;
17420 parent = spec_die->parent;
17424 if (parent == NULL)
17426 else if (parent->building_fullname)
17429 const char *parent_name;
17431 /* It has been seen on RealView 2.2 built binaries,
17432 DW_TAG_template_type_param types actually _defined_ as
17433 children of the parent class:
17436 template class <class Enum> Class{};
17437 Class<enum E> class_e;
17439 1: DW_TAG_class_type (Class)
17440 2: DW_TAG_enumeration_type (E)
17441 3: DW_TAG_enumerator (enum1:0)
17442 3: DW_TAG_enumerator (enum2:1)
17444 2: DW_TAG_template_type_param
17445 DW_AT_type DW_FORM_ref_udata (E)
17447 Besides being broken debug info, it can put GDB into an
17448 infinite loop. Consider:
17450 When we're building the full name for Class<E>, we'll start
17451 at Class, and go look over its template type parameters,
17452 finding E. We'll then try to build the full name of E, and
17453 reach here. We're now trying to build the full name of E,
17454 and look over the parent DIE for containing scope. In the
17455 broken case, if we followed the parent DIE of E, we'd again
17456 find Class, and once again go look at its template type
17457 arguments, etc., etc. Simply don't consider such parent die
17458 as source-level parent of this die (it can't be, the language
17459 doesn't allow it), and break the loop here. */
17460 name = dwarf2_name (die, cu);
17461 parent_name = dwarf2_name (parent, cu);
17462 complaint (&symfile_complaints,
17463 _("template param type '%s' defined within parent '%s'"),
17464 name ? name : "<unknown>",
17465 parent_name ? parent_name : "<unknown>");
17469 switch (parent->tag)
17471 case DW_TAG_namespace:
17472 parent_type = read_type_die (parent, cu);
17473 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17474 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17475 Work around this problem here. */
17476 if (cu->language == language_cplus
17477 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17479 /* We give a name to even anonymous namespaces. */
17480 return TYPE_TAG_NAME (parent_type);
17481 case DW_TAG_class_type:
17482 case DW_TAG_interface_type:
17483 case DW_TAG_structure_type:
17484 case DW_TAG_union_type:
17485 case DW_TAG_module:
17486 parent_type = read_type_die (parent, cu);
17487 if (TYPE_TAG_NAME (parent_type) != NULL)
17488 return TYPE_TAG_NAME (parent_type);
17490 /* An anonymous structure is only allowed non-static data
17491 members; no typedefs, no member functions, et cetera.
17492 So it does not need a prefix. */
17494 case DW_TAG_compile_unit:
17495 case DW_TAG_partial_unit:
17496 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17497 if (cu->language == language_cplus
17498 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17499 && die->child != NULL
17500 && (die->tag == DW_TAG_class_type
17501 || die->tag == DW_TAG_structure_type
17502 || die->tag == DW_TAG_union_type))
17504 char *name = guess_full_die_structure_name (die, cu);
17510 return determine_prefix (parent, cu);
17514 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17515 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17516 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17517 an obconcat, otherwise allocate storage for the result. The CU argument is
17518 used to determine the language and hence, the appropriate separator. */
17520 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17523 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17524 int physname, struct dwarf2_cu *cu)
17526 const char *lead = "";
17529 if (suffix == NULL || suffix[0] == '\0'
17530 || prefix == NULL || prefix[0] == '\0')
17532 else if (cu->language == language_java)
17534 else if (cu->language == language_fortran && physname)
17536 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17537 DW_AT_MIPS_linkage_name is preferred and used instead. */
17545 if (prefix == NULL)
17547 if (suffix == NULL)
17553 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17555 strcpy (retval, lead);
17556 strcat (retval, prefix);
17557 strcat (retval, sep);
17558 strcat (retval, suffix);
17563 /* We have an obstack. */
17564 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17568 /* Return sibling of die, NULL if no sibling. */
17570 static struct die_info *
17571 sibling_die (struct die_info *die)
17573 return die->sibling;
17576 /* Get name of a die, return NULL if not found. */
17578 static const char *
17579 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17580 struct obstack *obstack)
17582 if (name && cu->language == language_cplus)
17584 char *canon_name = cp_canonicalize_string (name);
17586 if (canon_name != NULL)
17588 if (strcmp (canon_name, name) != 0)
17589 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17590 xfree (canon_name);
17597 /* Get name of a die, return NULL if not found. */
17599 static const char *
17600 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17602 struct attribute *attr;
17604 attr = dwarf2_attr (die, DW_AT_name, cu);
17605 if ((!attr || !DW_STRING (attr))
17606 && die->tag != DW_TAG_class_type
17607 && die->tag != DW_TAG_interface_type
17608 && die->tag != DW_TAG_structure_type
17609 && die->tag != DW_TAG_union_type)
17614 case DW_TAG_compile_unit:
17615 case DW_TAG_partial_unit:
17616 /* Compilation units have a DW_AT_name that is a filename, not
17617 a source language identifier. */
17618 case DW_TAG_enumeration_type:
17619 case DW_TAG_enumerator:
17620 /* These tags always have simple identifiers already; no need
17621 to canonicalize them. */
17622 return DW_STRING (attr);
17624 case DW_TAG_subprogram:
17625 /* Java constructors will all be named "<init>", so return
17626 the class name when we see this special case. */
17627 if (cu->language == language_java
17628 && DW_STRING (attr) != NULL
17629 && strcmp (DW_STRING (attr), "<init>") == 0)
17631 struct dwarf2_cu *spec_cu = cu;
17632 struct die_info *spec_die;
17634 /* GCJ will output '<init>' for Java constructor names.
17635 For this special case, return the name of the parent class. */
17637 /* GCJ may output suprogram DIEs with AT_specification set.
17638 If so, use the name of the specified DIE. */
17639 spec_die = die_specification (die, &spec_cu);
17640 if (spec_die != NULL)
17641 return dwarf2_name (spec_die, spec_cu);
17646 if (die->tag == DW_TAG_class_type)
17647 return dwarf2_name (die, cu);
17649 while (die->tag != DW_TAG_compile_unit
17650 && die->tag != DW_TAG_partial_unit);
17654 case DW_TAG_class_type:
17655 case DW_TAG_interface_type:
17656 case DW_TAG_structure_type:
17657 case DW_TAG_union_type:
17658 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17659 structures or unions. These were of the form "._%d" in GCC 4.1,
17660 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17661 and GCC 4.4. We work around this problem by ignoring these. */
17662 if (attr && DW_STRING (attr)
17663 && (strncmp (DW_STRING (attr), "._", 2) == 0
17664 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17667 /* GCC might emit a nameless typedef that has a linkage name. See
17668 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17669 if (!attr || DW_STRING (attr) == NULL)
17671 char *demangled = NULL;
17673 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17675 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17677 if (attr == NULL || DW_STRING (attr) == NULL)
17680 /* Avoid demangling DW_STRING (attr) the second time on a second
17681 call for the same DIE. */
17682 if (!DW_STRING_IS_CANONICAL (attr))
17683 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17689 /* FIXME: we already did this for the partial symbol... */
17690 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17691 demangled, strlen (demangled));
17692 DW_STRING_IS_CANONICAL (attr) = 1;
17695 /* Strip any leading namespaces/classes, keep only the base name.
17696 DW_AT_name for named DIEs does not contain the prefixes. */
17697 base = strrchr (DW_STRING (attr), ':');
17698 if (base && base > DW_STRING (attr) && base[-1] == ':')
17701 return DW_STRING (attr);
17710 if (!DW_STRING_IS_CANONICAL (attr))
17713 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17714 &cu->objfile->objfile_obstack);
17715 DW_STRING_IS_CANONICAL (attr) = 1;
17717 return DW_STRING (attr);
17720 /* Return the die that this die in an extension of, or NULL if there
17721 is none. *EXT_CU is the CU containing DIE on input, and the CU
17722 containing the return value on output. */
17724 static struct die_info *
17725 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17727 struct attribute *attr;
17729 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17733 return follow_die_ref (die, attr, ext_cu);
17736 /* Convert a DIE tag into its string name. */
17738 static const char *
17739 dwarf_tag_name (unsigned tag)
17741 const char *name = get_DW_TAG_name (tag);
17744 return "DW_TAG_<unknown>";
17749 /* Convert a DWARF attribute code into its string name. */
17751 static const char *
17752 dwarf_attr_name (unsigned attr)
17756 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17757 if (attr == DW_AT_MIPS_fde)
17758 return "DW_AT_MIPS_fde";
17760 if (attr == DW_AT_HP_block_index)
17761 return "DW_AT_HP_block_index";
17764 name = get_DW_AT_name (attr);
17767 return "DW_AT_<unknown>";
17772 /* Convert a DWARF value form code into its string name. */
17774 static const char *
17775 dwarf_form_name (unsigned form)
17777 const char *name = get_DW_FORM_name (form);
17780 return "DW_FORM_<unknown>";
17786 dwarf_bool_name (unsigned mybool)
17794 /* Convert a DWARF type code into its string name. */
17796 static const char *
17797 dwarf_type_encoding_name (unsigned enc)
17799 const char *name = get_DW_ATE_name (enc);
17802 return "DW_ATE_<unknown>";
17808 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17812 print_spaces (indent, f);
17813 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17814 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17816 if (die->parent != NULL)
17818 print_spaces (indent, f);
17819 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17820 die->parent->offset.sect_off);
17823 print_spaces (indent, f);
17824 fprintf_unfiltered (f, " has children: %s\n",
17825 dwarf_bool_name (die->child != NULL));
17827 print_spaces (indent, f);
17828 fprintf_unfiltered (f, " attributes:\n");
17830 for (i = 0; i < die->num_attrs; ++i)
17832 print_spaces (indent, f);
17833 fprintf_unfiltered (f, " %s (%s) ",
17834 dwarf_attr_name (die->attrs[i].name),
17835 dwarf_form_name (die->attrs[i].form));
17837 switch (die->attrs[i].form)
17840 case DW_FORM_GNU_addr_index:
17841 fprintf_unfiltered (f, "address: ");
17842 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17844 case DW_FORM_block2:
17845 case DW_FORM_block4:
17846 case DW_FORM_block:
17847 case DW_FORM_block1:
17848 fprintf_unfiltered (f, "block: size %s",
17849 pulongest (DW_BLOCK (&die->attrs[i])->size));
17851 case DW_FORM_exprloc:
17852 fprintf_unfiltered (f, "expression: size %s",
17853 pulongest (DW_BLOCK (&die->attrs[i])->size));
17855 case DW_FORM_ref_addr:
17856 fprintf_unfiltered (f, "ref address: ");
17857 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17859 case DW_FORM_GNU_ref_alt:
17860 fprintf_unfiltered (f, "alt ref address: ");
17861 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17867 case DW_FORM_ref_udata:
17868 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17869 (long) (DW_UNSND (&die->attrs[i])));
17871 case DW_FORM_data1:
17872 case DW_FORM_data2:
17873 case DW_FORM_data4:
17874 case DW_FORM_data8:
17875 case DW_FORM_udata:
17876 case DW_FORM_sdata:
17877 fprintf_unfiltered (f, "constant: %s",
17878 pulongest (DW_UNSND (&die->attrs[i])));
17880 case DW_FORM_sec_offset:
17881 fprintf_unfiltered (f, "section offset: %s",
17882 pulongest (DW_UNSND (&die->attrs[i])));
17884 case DW_FORM_ref_sig8:
17885 fprintf_unfiltered (f, "signature: %s",
17886 hex_string (DW_SIGNATURE (&die->attrs[i])));
17888 case DW_FORM_string:
17890 case DW_FORM_GNU_str_index:
17891 case DW_FORM_GNU_strp_alt:
17892 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17893 DW_STRING (&die->attrs[i])
17894 ? DW_STRING (&die->attrs[i]) : "",
17895 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17898 if (DW_UNSND (&die->attrs[i]))
17899 fprintf_unfiltered (f, "flag: TRUE");
17901 fprintf_unfiltered (f, "flag: FALSE");
17903 case DW_FORM_flag_present:
17904 fprintf_unfiltered (f, "flag: TRUE");
17906 case DW_FORM_indirect:
17907 /* The reader will have reduced the indirect form to
17908 the "base form" so this form should not occur. */
17909 fprintf_unfiltered (f,
17910 "unexpected attribute form: DW_FORM_indirect");
17913 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17914 die->attrs[i].form);
17917 fprintf_unfiltered (f, "\n");
17922 dump_die_for_error (struct die_info *die)
17924 dump_die_shallow (gdb_stderr, 0, die);
17928 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17930 int indent = level * 4;
17932 gdb_assert (die != NULL);
17934 if (level >= max_level)
17937 dump_die_shallow (f, indent, die);
17939 if (die->child != NULL)
17941 print_spaces (indent, f);
17942 fprintf_unfiltered (f, " Children:");
17943 if (level + 1 < max_level)
17945 fprintf_unfiltered (f, "\n");
17946 dump_die_1 (f, level + 1, max_level, die->child);
17950 fprintf_unfiltered (f,
17951 " [not printed, max nesting level reached]\n");
17955 if (die->sibling != NULL && level > 0)
17957 dump_die_1 (f, level, max_level, die->sibling);
17961 /* This is called from the pdie macro in gdbinit.in.
17962 It's not static so gcc will keep a copy callable from gdb. */
17965 dump_die (struct die_info *die, int max_level)
17967 dump_die_1 (gdb_stdlog, 0, max_level, die);
17971 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17975 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17981 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17985 dwarf2_get_ref_die_offset (const struct attribute *attr)
17987 sect_offset retval = { DW_UNSND (attr) };
17989 if (attr_form_is_ref (attr))
17992 retval.sect_off = 0;
17993 complaint (&symfile_complaints,
17994 _("unsupported die ref attribute form: '%s'"),
17995 dwarf_form_name (attr->form));
17999 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
18000 * the value held by the attribute is not constant. */
18003 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
18005 if (attr->form == DW_FORM_sdata)
18006 return DW_SND (attr);
18007 else if (attr->form == DW_FORM_udata
18008 || attr->form == DW_FORM_data1
18009 || attr->form == DW_FORM_data2
18010 || attr->form == DW_FORM_data4
18011 || attr->form == DW_FORM_data8)
18012 return DW_UNSND (attr);
18015 complaint (&symfile_complaints,
18016 _("Attribute value is not a constant (%s)"),
18017 dwarf_form_name (attr->form));
18018 return default_value;
18022 /* Follow reference or signature attribute ATTR of SRC_DIE.
18023 On entry *REF_CU is the CU of SRC_DIE.
18024 On exit *REF_CU is the CU of the result. */
18026 static struct die_info *
18027 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
18028 struct dwarf2_cu **ref_cu)
18030 struct die_info *die;
18032 if (attr_form_is_ref (attr))
18033 die = follow_die_ref (src_die, attr, ref_cu);
18034 else if (attr->form == DW_FORM_ref_sig8)
18035 die = follow_die_sig (src_die, attr, ref_cu);
18038 dump_die_for_error (src_die);
18039 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
18040 (*ref_cu)->objfile->name);
18046 /* Follow reference OFFSET.
18047 On entry *REF_CU is the CU of the source die referencing OFFSET.
18048 On exit *REF_CU is the CU of the result.
18049 Returns NULL if OFFSET is invalid. */
18051 static struct die_info *
18052 follow_die_offset (sect_offset offset, int offset_in_dwz,
18053 struct dwarf2_cu **ref_cu)
18055 struct die_info temp_die;
18056 struct dwarf2_cu *target_cu, *cu = *ref_cu;
18058 gdb_assert (cu->per_cu != NULL);
18062 if (cu->per_cu->is_debug_types)
18064 /* .debug_types CUs cannot reference anything outside their CU.
18065 If they need to, they have to reference a signatured type via
18066 DW_FORM_ref_sig8. */
18067 if (! offset_in_cu_p (&cu->header, offset))
18070 else if (offset_in_dwz != cu->per_cu->is_dwz
18071 || ! offset_in_cu_p (&cu->header, offset))
18073 struct dwarf2_per_cu_data *per_cu;
18075 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
18078 /* If necessary, add it to the queue and load its DIEs. */
18079 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
18080 load_full_comp_unit (per_cu, cu->language);
18082 target_cu = per_cu->cu;
18084 else if (cu->dies == NULL)
18086 /* We're loading full DIEs during partial symbol reading. */
18087 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
18088 load_full_comp_unit (cu->per_cu, language_minimal);
18091 *ref_cu = target_cu;
18092 temp_die.offset = offset;
18093 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
18096 /* Follow reference attribute ATTR of SRC_DIE.
18097 On entry *REF_CU is the CU of SRC_DIE.
18098 On exit *REF_CU is the CU of the result. */
18100 static struct die_info *
18101 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
18102 struct dwarf2_cu **ref_cu)
18104 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18105 struct dwarf2_cu *cu = *ref_cu;
18106 struct die_info *die;
18108 die = follow_die_offset (offset,
18109 (attr->form == DW_FORM_GNU_ref_alt
18110 || cu->per_cu->is_dwz),
18113 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
18114 "at 0x%x [in module %s]"),
18115 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
18120 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
18121 Returned value is intended for DW_OP_call*. Returned
18122 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
18124 struct dwarf2_locexpr_baton
18125 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
18126 struct dwarf2_per_cu_data *per_cu,
18127 CORE_ADDR (*get_frame_pc) (void *baton),
18130 struct dwarf2_cu *cu;
18131 struct die_info *die;
18132 struct attribute *attr;
18133 struct dwarf2_locexpr_baton retval;
18135 dw2_setup (per_cu->objfile);
18137 if (per_cu->cu == NULL)
18141 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18143 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18144 offset.sect_off, per_cu->objfile->name);
18146 attr = dwarf2_attr (die, DW_AT_location, cu);
18149 /* DWARF: "If there is no such attribute, then there is no effect.".
18150 DATA is ignored if SIZE is 0. */
18152 retval.data = NULL;
18155 else if (attr_form_is_section_offset (attr))
18157 struct dwarf2_loclist_baton loclist_baton;
18158 CORE_ADDR pc = (*get_frame_pc) (baton);
18161 fill_in_loclist_baton (cu, &loclist_baton, attr);
18163 retval.data = dwarf2_find_location_expression (&loclist_baton,
18165 retval.size = size;
18169 if (!attr_form_is_block (attr))
18170 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
18171 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
18172 offset.sect_off, per_cu->objfile->name);
18174 retval.data = DW_BLOCK (attr)->data;
18175 retval.size = DW_BLOCK (attr)->size;
18177 retval.per_cu = cu->per_cu;
18179 age_cached_comp_units ();
18184 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
18187 struct dwarf2_locexpr_baton
18188 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
18189 struct dwarf2_per_cu_data *per_cu,
18190 CORE_ADDR (*get_frame_pc) (void *baton),
18193 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
18195 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
18198 /* Write a constant of a given type as target-ordered bytes into
18201 static const gdb_byte *
18202 write_constant_as_bytes (struct obstack *obstack,
18203 enum bfd_endian byte_order,
18210 *len = TYPE_LENGTH (type);
18211 result = obstack_alloc (obstack, *len);
18212 store_unsigned_integer (result, *len, byte_order, value);
18217 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
18218 pointer to the constant bytes and set LEN to the length of the
18219 data. If memory is needed, allocate it on OBSTACK. If the DIE
18220 does not have a DW_AT_const_value, return NULL. */
18223 dwarf2_fetch_constant_bytes (sect_offset offset,
18224 struct dwarf2_per_cu_data *per_cu,
18225 struct obstack *obstack,
18228 struct dwarf2_cu *cu;
18229 struct die_info *die;
18230 struct attribute *attr;
18231 const gdb_byte *result = NULL;
18234 enum bfd_endian byte_order;
18236 dw2_setup (per_cu->objfile);
18238 if (per_cu->cu == NULL)
18242 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18244 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18245 offset.sect_off, per_cu->objfile->name);
18248 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18252 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
18253 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18255 switch (attr->form)
18258 case DW_FORM_GNU_addr_index:
18262 *len = cu->header.addr_size;
18263 tem = obstack_alloc (obstack, *len);
18264 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
18268 case DW_FORM_string:
18270 case DW_FORM_GNU_str_index:
18271 case DW_FORM_GNU_strp_alt:
18272 /* DW_STRING is already allocated on the objfile obstack, point
18274 result = (const gdb_byte *) DW_STRING (attr);
18275 *len = strlen (DW_STRING (attr));
18277 case DW_FORM_block1:
18278 case DW_FORM_block2:
18279 case DW_FORM_block4:
18280 case DW_FORM_block:
18281 case DW_FORM_exprloc:
18282 result = DW_BLOCK (attr)->data;
18283 *len = DW_BLOCK (attr)->size;
18286 /* The DW_AT_const_value attributes are supposed to carry the
18287 symbol's value "represented as it would be on the target
18288 architecture." By the time we get here, it's already been
18289 converted to host endianness, so we just need to sign- or
18290 zero-extend it as appropriate. */
18291 case DW_FORM_data1:
18292 type = die_type (die, cu);
18293 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
18294 if (result == NULL)
18295 result = write_constant_as_bytes (obstack, byte_order,
18298 case DW_FORM_data2:
18299 type = die_type (die, cu);
18300 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
18301 if (result == NULL)
18302 result = write_constant_as_bytes (obstack, byte_order,
18305 case DW_FORM_data4:
18306 type = die_type (die, cu);
18307 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
18308 if (result == NULL)
18309 result = write_constant_as_bytes (obstack, byte_order,
18312 case DW_FORM_data8:
18313 type = die_type (die, cu);
18314 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
18315 if (result == NULL)
18316 result = write_constant_as_bytes (obstack, byte_order,
18320 case DW_FORM_sdata:
18321 type = die_type (die, cu);
18322 result = write_constant_as_bytes (obstack, byte_order,
18323 type, DW_SND (attr), len);
18326 case DW_FORM_udata:
18327 type = die_type (die, cu);
18328 result = write_constant_as_bytes (obstack, byte_order,
18329 type, DW_UNSND (attr), len);
18333 complaint (&symfile_complaints,
18334 _("unsupported const value attribute form: '%s'"),
18335 dwarf_form_name (attr->form));
18342 /* Return the type of the DIE at DIE_OFFSET in the CU named by
18346 dwarf2_get_die_type (cu_offset die_offset,
18347 struct dwarf2_per_cu_data *per_cu)
18349 sect_offset die_offset_sect;
18351 dw2_setup (per_cu->objfile);
18353 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
18354 return get_die_type_at_offset (die_offset_sect, per_cu);
18357 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
18358 On entry *REF_CU is the CU of SRC_DIE.
18359 On exit *REF_CU is the CU of the result.
18360 Returns NULL if the referenced DIE isn't found. */
18362 static struct die_info *
18363 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
18364 struct dwarf2_cu **ref_cu)
18366 struct objfile *objfile = (*ref_cu)->objfile;
18367 struct die_info temp_die;
18368 struct dwarf2_cu *sig_cu;
18369 struct die_info *die;
18371 /* While it might be nice to assert sig_type->type == NULL here,
18372 we can get here for DW_AT_imported_declaration where we need
18373 the DIE not the type. */
18375 /* If necessary, add it to the queue and load its DIEs. */
18377 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
18378 read_signatured_type (sig_type);
18380 gdb_assert (sig_type->per_cu.cu != NULL);
18382 sig_cu = sig_type->per_cu.cu;
18383 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
18384 temp_die.offset = sig_type->type_offset_in_section;
18385 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
18386 temp_die.offset.sect_off);
18389 /* For .gdb_index version 7 keep track of included TUs.
18390 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
18391 if (dwarf2_per_objfile->index_table != NULL
18392 && dwarf2_per_objfile->index_table->version <= 7)
18394 VEC_safe_push (dwarf2_per_cu_ptr,
18395 (*ref_cu)->per_cu->imported_symtabs,
18406 /* Follow signatured type referenced by ATTR in SRC_DIE.
18407 On entry *REF_CU is the CU of SRC_DIE.
18408 On exit *REF_CU is the CU of the result.
18409 The result is the DIE of the type.
18410 If the referenced type cannot be found an error is thrown. */
18412 static struct die_info *
18413 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
18414 struct dwarf2_cu **ref_cu)
18416 ULONGEST signature = DW_SIGNATURE (attr);
18417 struct signatured_type *sig_type;
18418 struct die_info *die;
18420 gdb_assert (attr->form == DW_FORM_ref_sig8);
18422 sig_type = lookup_signatured_type (*ref_cu, signature);
18423 /* sig_type will be NULL if the signatured type is missing from
18425 if (sig_type == NULL)
18427 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
18428 " from DIE at 0x%x [in module %s]"),
18429 hex_string (signature), src_die->offset.sect_off,
18430 (*ref_cu)->objfile->name);
18433 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
18436 dump_die_for_error (src_die);
18437 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
18438 " from DIE at 0x%x [in module %s]"),
18439 hex_string (signature), src_die->offset.sect_off,
18440 (*ref_cu)->objfile->name);
18446 /* Get the type specified by SIGNATURE referenced in DIE/CU,
18447 reading in and processing the type unit if necessary. */
18449 static struct type *
18450 get_signatured_type (struct die_info *die, ULONGEST signature,
18451 struct dwarf2_cu *cu)
18453 struct signatured_type *sig_type;
18454 struct dwarf2_cu *type_cu;
18455 struct die_info *type_die;
18458 sig_type = lookup_signatured_type (cu, signature);
18459 /* sig_type will be NULL if the signatured type is missing from
18461 if (sig_type == NULL)
18463 complaint (&symfile_complaints,
18464 _("Dwarf Error: Cannot find signatured DIE %s referenced"
18465 " from DIE at 0x%x [in module %s]"),
18466 hex_string (signature), die->offset.sect_off,
18467 dwarf2_per_objfile->objfile->name);
18468 return build_error_marker_type (cu, die);
18471 /* If we already know the type we're done. */
18472 if (sig_type->type != NULL)
18473 return sig_type->type;
18476 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
18477 if (type_die != NULL)
18479 /* N.B. We need to call get_die_type to ensure only one type for this DIE
18480 is created. This is important, for example, because for c++ classes
18481 we need TYPE_NAME set which is only done by new_symbol. Blech. */
18482 type = read_type_die (type_die, type_cu);
18485 complaint (&symfile_complaints,
18486 _("Dwarf Error: Cannot build signatured type %s"
18487 " referenced from DIE at 0x%x [in module %s]"),
18488 hex_string (signature), die->offset.sect_off,
18489 dwarf2_per_objfile->objfile->name);
18490 type = build_error_marker_type (cu, die);
18495 complaint (&symfile_complaints,
18496 _("Dwarf Error: Problem reading signatured DIE %s referenced"
18497 " from DIE at 0x%x [in module %s]"),
18498 hex_string (signature), die->offset.sect_off,
18499 dwarf2_per_objfile->objfile->name);
18500 type = build_error_marker_type (cu, die);
18502 sig_type->type = type;
18507 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
18508 reading in and processing the type unit if necessary. */
18510 static struct type *
18511 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
18512 struct dwarf2_cu *cu) /* ARI: editCase function */
18514 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
18515 if (attr_form_is_ref (attr))
18517 struct dwarf2_cu *type_cu = cu;
18518 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
18520 return read_type_die (type_die, type_cu);
18522 else if (attr->form == DW_FORM_ref_sig8)
18524 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
18528 complaint (&symfile_complaints,
18529 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
18530 " at 0x%x [in module %s]"),
18531 dwarf_form_name (attr->form), die->offset.sect_off,
18532 dwarf2_per_objfile->objfile->name);
18533 return build_error_marker_type (cu, die);
18537 /* Load the DIEs associated with type unit PER_CU into memory. */
18540 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
18542 struct signatured_type *sig_type;
18544 /* Caller is responsible for ensuring type_unit_groups don't get here. */
18545 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
18547 /* We have the per_cu, but we need the signatured_type.
18548 Fortunately this is an easy translation. */
18549 gdb_assert (per_cu->is_debug_types);
18550 sig_type = (struct signatured_type *) per_cu;
18552 gdb_assert (per_cu->cu == NULL);
18554 read_signatured_type (sig_type);
18556 gdb_assert (per_cu->cu != NULL);
18559 /* die_reader_func for read_signatured_type.
18560 This is identical to load_full_comp_unit_reader,
18561 but is kept separate for now. */
18564 read_signatured_type_reader (const struct die_reader_specs *reader,
18565 const gdb_byte *info_ptr,
18566 struct die_info *comp_unit_die,
18570 struct dwarf2_cu *cu = reader->cu;
18572 gdb_assert (cu->die_hash == NULL);
18574 htab_create_alloc_ex (cu->header.length / 12,
18578 &cu->comp_unit_obstack,
18579 hashtab_obstack_allocate,
18580 dummy_obstack_deallocate);
18583 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18584 &info_ptr, comp_unit_die);
18585 cu->dies = comp_unit_die;
18586 /* comp_unit_die is not stored in die_hash, no need. */
18588 /* We try not to read any attributes in this function, because not
18589 all CUs needed for references have been loaded yet, and symbol
18590 table processing isn't initialized. But we have to set the CU language,
18591 or we won't be able to build types correctly.
18592 Similarly, if we do not read the producer, we can not apply
18593 producer-specific interpretation. */
18594 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18597 /* Read in a signatured type and build its CU and DIEs.
18598 If the type is a stub for the real type in a DWO file,
18599 read in the real type from the DWO file as well. */
18602 read_signatured_type (struct signatured_type *sig_type)
18604 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18606 gdb_assert (per_cu->is_debug_types);
18607 gdb_assert (per_cu->cu == NULL);
18609 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18610 read_signatured_type_reader, NULL);
18613 /* Decode simple location descriptions.
18614 Given a pointer to a dwarf block that defines a location, compute
18615 the location and return the value.
18617 NOTE drow/2003-11-18: This function is called in two situations
18618 now: for the address of static or global variables (partial symbols
18619 only) and for offsets into structures which are expected to be
18620 (more or less) constant. The partial symbol case should go away,
18621 and only the constant case should remain. That will let this
18622 function complain more accurately. A few special modes are allowed
18623 without complaint for global variables (for instance, global
18624 register values and thread-local values).
18626 A location description containing no operations indicates that the
18627 object is optimized out. The return value is 0 for that case.
18628 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18629 callers will only want a very basic result and this can become a
18632 Note that stack[0] is unused except as a default error return. */
18635 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18637 struct objfile *objfile = cu->objfile;
18639 size_t size = blk->size;
18640 const gdb_byte *data = blk->data;
18641 CORE_ADDR stack[64];
18643 unsigned int bytes_read, unsnd;
18649 stack[++stacki] = 0;
18688 stack[++stacki] = op - DW_OP_lit0;
18723 stack[++stacki] = op - DW_OP_reg0;
18725 dwarf2_complex_location_expr_complaint ();
18729 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18731 stack[++stacki] = unsnd;
18733 dwarf2_complex_location_expr_complaint ();
18737 stack[++stacki] = read_address (objfile->obfd, &data[i],
18742 case DW_OP_const1u:
18743 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18747 case DW_OP_const1s:
18748 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18752 case DW_OP_const2u:
18753 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18757 case DW_OP_const2s:
18758 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18762 case DW_OP_const4u:
18763 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18767 case DW_OP_const4s:
18768 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18772 case DW_OP_const8u:
18773 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18778 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18784 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18789 stack[stacki + 1] = stack[stacki];
18794 stack[stacki - 1] += stack[stacki];
18798 case DW_OP_plus_uconst:
18799 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18805 stack[stacki - 1] -= stack[stacki];
18810 /* If we're not the last op, then we definitely can't encode
18811 this using GDB's address_class enum. This is valid for partial
18812 global symbols, although the variable's address will be bogus
18815 dwarf2_complex_location_expr_complaint ();
18818 case DW_OP_GNU_push_tls_address:
18819 /* The top of the stack has the offset from the beginning
18820 of the thread control block at which the variable is located. */
18821 /* Nothing should follow this operator, so the top of stack would
18823 /* This is valid for partial global symbols, but the variable's
18824 address will be bogus in the psymtab. Make it always at least
18825 non-zero to not look as a variable garbage collected by linker
18826 which have DW_OP_addr 0. */
18828 dwarf2_complex_location_expr_complaint ();
18832 case DW_OP_GNU_uninit:
18835 case DW_OP_GNU_addr_index:
18836 case DW_OP_GNU_const_index:
18837 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18844 const char *name = get_DW_OP_name (op);
18847 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18850 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18854 return (stack[stacki]);
18857 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18858 outside of the allocated space. Also enforce minimum>0. */
18859 if (stacki >= ARRAY_SIZE (stack) - 1)
18861 complaint (&symfile_complaints,
18862 _("location description stack overflow"));
18868 complaint (&symfile_complaints,
18869 _("location description stack underflow"));
18873 return (stack[stacki]);
18876 /* memory allocation interface */
18878 static struct dwarf_block *
18879 dwarf_alloc_block (struct dwarf2_cu *cu)
18881 struct dwarf_block *blk;
18883 blk = (struct dwarf_block *)
18884 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18888 static struct die_info *
18889 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18891 struct die_info *die;
18892 size_t size = sizeof (struct die_info);
18895 size += (num_attrs - 1) * sizeof (struct attribute);
18897 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18898 memset (die, 0, sizeof (struct die_info));
18903 /* Macro support. */
18905 /* Return file name relative to the compilation directory of file number I in
18906 *LH's file name table. The result is allocated using xmalloc; the caller is
18907 responsible for freeing it. */
18910 file_file_name (int file, struct line_header *lh)
18912 /* Is the file number a valid index into the line header's file name
18913 table? Remember that file numbers start with one, not zero. */
18914 if (1 <= file && file <= lh->num_file_names)
18916 struct file_entry *fe = &lh->file_names[file - 1];
18918 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18919 return xstrdup (fe->name);
18920 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18925 /* The compiler produced a bogus file number. We can at least
18926 record the macro definitions made in the file, even if we
18927 won't be able to find the file by name. */
18928 char fake_name[80];
18930 xsnprintf (fake_name, sizeof (fake_name),
18931 "<bad macro file number %d>", file);
18933 complaint (&symfile_complaints,
18934 _("bad file number in macro information (%d)"),
18937 return xstrdup (fake_name);
18941 /* Return the full name of file number I in *LH's file name table.
18942 Use COMP_DIR as the name of the current directory of the
18943 compilation. The result is allocated using xmalloc; the caller is
18944 responsible for freeing it. */
18946 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18948 /* Is the file number a valid index into the line header's file name
18949 table? Remember that file numbers start with one, not zero. */
18950 if (1 <= file && file <= lh->num_file_names)
18952 char *relative = file_file_name (file, lh);
18954 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18956 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18959 return file_file_name (file, lh);
18963 static struct macro_source_file *
18964 macro_start_file (int file, int line,
18965 struct macro_source_file *current_file,
18966 const char *comp_dir,
18967 struct line_header *lh, struct objfile *objfile)
18969 /* File name relative to the compilation directory of this source file. */
18970 char *file_name = file_file_name (file, lh);
18972 /* We don't create a macro table for this compilation unit
18973 at all until we actually get a filename. */
18974 if (! pending_macros)
18975 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18976 objfile->per_bfd->macro_cache,
18979 if (! current_file)
18981 /* If we have no current file, then this must be the start_file
18982 directive for the compilation unit's main source file. */
18983 current_file = macro_set_main (pending_macros, file_name);
18984 macro_define_special (pending_macros);
18987 current_file = macro_include (current_file, line, file_name);
18991 return current_file;
18995 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18996 followed by a null byte. */
18998 copy_string (const char *buf, int len)
19000 char *s = xmalloc (len + 1);
19002 memcpy (s, buf, len);
19008 static const char *
19009 consume_improper_spaces (const char *p, const char *body)
19013 complaint (&symfile_complaints,
19014 _("macro definition contains spaces "
19015 "in formal argument list:\n`%s'"),
19027 parse_macro_definition (struct macro_source_file *file, int line,
19032 /* The body string takes one of two forms. For object-like macro
19033 definitions, it should be:
19035 <macro name> " " <definition>
19037 For function-like macro definitions, it should be:
19039 <macro name> "() " <definition>
19041 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
19043 Spaces may appear only where explicitly indicated, and in the
19046 The Dwarf 2 spec says that an object-like macro's name is always
19047 followed by a space, but versions of GCC around March 2002 omit
19048 the space when the macro's definition is the empty string.
19050 The Dwarf 2 spec says that there should be no spaces between the
19051 formal arguments in a function-like macro's formal argument list,
19052 but versions of GCC around March 2002 include spaces after the
19056 /* Find the extent of the macro name. The macro name is terminated
19057 by either a space or null character (for an object-like macro) or
19058 an opening paren (for a function-like macro). */
19059 for (p = body; *p; p++)
19060 if (*p == ' ' || *p == '(')
19063 if (*p == ' ' || *p == '\0')
19065 /* It's an object-like macro. */
19066 int name_len = p - body;
19067 char *name = copy_string (body, name_len);
19068 const char *replacement;
19071 replacement = body + name_len + 1;
19074 dwarf2_macro_malformed_definition_complaint (body);
19075 replacement = body + name_len;
19078 macro_define_object (file, line, name, replacement);
19082 else if (*p == '(')
19084 /* It's a function-like macro. */
19085 char *name = copy_string (body, p - body);
19088 char **argv = xmalloc (argv_size * sizeof (*argv));
19092 p = consume_improper_spaces (p, body);
19094 /* Parse the formal argument list. */
19095 while (*p && *p != ')')
19097 /* Find the extent of the current argument name. */
19098 const char *arg_start = p;
19100 while (*p && *p != ',' && *p != ')' && *p != ' ')
19103 if (! *p || p == arg_start)
19104 dwarf2_macro_malformed_definition_complaint (body);
19107 /* Make sure argv has room for the new argument. */
19108 if (argc >= argv_size)
19111 argv = xrealloc (argv, argv_size * sizeof (*argv));
19114 argv[argc++] = copy_string (arg_start, p - arg_start);
19117 p = consume_improper_spaces (p, body);
19119 /* Consume the comma, if present. */
19124 p = consume_improper_spaces (p, body);
19133 /* Perfectly formed definition, no complaints. */
19134 macro_define_function (file, line, name,
19135 argc, (const char **) argv,
19137 else if (*p == '\0')
19139 /* Complain, but do define it. */
19140 dwarf2_macro_malformed_definition_complaint (body);
19141 macro_define_function (file, line, name,
19142 argc, (const char **) argv,
19146 /* Just complain. */
19147 dwarf2_macro_malformed_definition_complaint (body);
19150 /* Just complain. */
19151 dwarf2_macro_malformed_definition_complaint (body);
19157 for (i = 0; i < argc; i++)
19163 dwarf2_macro_malformed_definition_complaint (body);
19166 /* Skip some bytes from BYTES according to the form given in FORM.
19167 Returns the new pointer. */
19169 static const gdb_byte *
19170 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
19171 enum dwarf_form form,
19172 unsigned int offset_size,
19173 struct dwarf2_section_info *section)
19175 unsigned int bytes_read;
19179 case DW_FORM_data1:
19184 case DW_FORM_data2:
19188 case DW_FORM_data4:
19192 case DW_FORM_data8:
19196 case DW_FORM_string:
19197 read_direct_string (abfd, bytes, &bytes_read);
19198 bytes += bytes_read;
19201 case DW_FORM_sec_offset:
19203 case DW_FORM_GNU_strp_alt:
19204 bytes += offset_size;
19207 case DW_FORM_block:
19208 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
19209 bytes += bytes_read;
19212 case DW_FORM_block1:
19213 bytes += 1 + read_1_byte (abfd, bytes);
19215 case DW_FORM_block2:
19216 bytes += 2 + read_2_bytes (abfd, bytes);
19218 case DW_FORM_block4:
19219 bytes += 4 + read_4_bytes (abfd, bytes);
19222 case DW_FORM_sdata:
19223 case DW_FORM_udata:
19224 case DW_FORM_GNU_addr_index:
19225 case DW_FORM_GNU_str_index:
19226 bytes = gdb_skip_leb128 (bytes, buffer_end);
19229 dwarf2_section_buffer_overflow_complaint (section);
19237 complaint (&symfile_complaints,
19238 _("invalid form 0x%x in `%s'"),
19240 section->asection->name);
19248 /* A helper for dwarf_decode_macros that handles skipping an unknown
19249 opcode. Returns an updated pointer to the macro data buffer; or,
19250 on error, issues a complaint and returns NULL. */
19252 static const gdb_byte *
19253 skip_unknown_opcode (unsigned int opcode,
19254 const gdb_byte **opcode_definitions,
19255 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19257 unsigned int offset_size,
19258 struct dwarf2_section_info *section)
19260 unsigned int bytes_read, i;
19262 const gdb_byte *defn;
19264 if (opcode_definitions[opcode] == NULL)
19266 complaint (&symfile_complaints,
19267 _("unrecognized DW_MACFINO opcode 0x%x"),
19272 defn = opcode_definitions[opcode];
19273 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
19274 defn += bytes_read;
19276 for (i = 0; i < arg; ++i)
19278 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
19280 if (mac_ptr == NULL)
19282 /* skip_form_bytes already issued the complaint. */
19290 /* A helper function which parses the header of a macro section.
19291 If the macro section is the extended (for now called "GNU") type,
19292 then this updates *OFFSET_SIZE. Returns a pointer to just after
19293 the header, or issues a complaint and returns NULL on error. */
19295 static const gdb_byte *
19296 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
19298 const gdb_byte *mac_ptr,
19299 unsigned int *offset_size,
19300 int section_is_gnu)
19302 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
19304 if (section_is_gnu)
19306 unsigned int version, flags;
19308 version = read_2_bytes (abfd, mac_ptr);
19311 complaint (&symfile_complaints,
19312 _("unrecognized version `%d' in .debug_macro section"),
19318 flags = read_1_byte (abfd, mac_ptr);
19320 *offset_size = (flags & 1) ? 8 : 4;
19322 if ((flags & 2) != 0)
19323 /* We don't need the line table offset. */
19324 mac_ptr += *offset_size;
19326 /* Vendor opcode descriptions. */
19327 if ((flags & 4) != 0)
19329 unsigned int i, count;
19331 count = read_1_byte (abfd, mac_ptr);
19333 for (i = 0; i < count; ++i)
19335 unsigned int opcode, bytes_read;
19338 opcode = read_1_byte (abfd, mac_ptr);
19340 opcode_definitions[opcode] = mac_ptr;
19341 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19342 mac_ptr += bytes_read;
19351 /* A helper for dwarf_decode_macros that handles the GNU extensions,
19352 including DW_MACRO_GNU_transparent_include. */
19355 dwarf_decode_macro_bytes (bfd *abfd,
19356 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19357 struct macro_source_file *current_file,
19358 struct line_header *lh, const char *comp_dir,
19359 struct dwarf2_section_info *section,
19360 int section_is_gnu, int section_is_dwz,
19361 unsigned int offset_size,
19362 struct objfile *objfile,
19363 htab_t include_hash)
19365 enum dwarf_macro_record_type macinfo_type;
19366 int at_commandline;
19367 const gdb_byte *opcode_definitions[256];
19369 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19370 &offset_size, section_is_gnu);
19371 if (mac_ptr == NULL)
19373 /* We already issued a complaint. */
19377 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
19378 GDB is still reading the definitions from command line. First
19379 DW_MACINFO_start_file will need to be ignored as it was already executed
19380 to create CURRENT_FILE for the main source holding also the command line
19381 definitions. On first met DW_MACINFO_start_file this flag is reset to
19382 normally execute all the remaining DW_MACINFO_start_file macinfos. */
19384 at_commandline = 1;
19388 /* Do we at least have room for a macinfo type byte? */
19389 if (mac_ptr >= mac_end)
19391 dwarf2_section_buffer_overflow_complaint (section);
19395 macinfo_type = read_1_byte (abfd, mac_ptr);
19398 /* Note that we rely on the fact that the corresponding GNU and
19399 DWARF constants are the same. */
19400 switch (macinfo_type)
19402 /* A zero macinfo type indicates the end of the macro
19407 case DW_MACRO_GNU_define:
19408 case DW_MACRO_GNU_undef:
19409 case DW_MACRO_GNU_define_indirect:
19410 case DW_MACRO_GNU_undef_indirect:
19411 case DW_MACRO_GNU_define_indirect_alt:
19412 case DW_MACRO_GNU_undef_indirect_alt:
19414 unsigned int bytes_read;
19419 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19420 mac_ptr += bytes_read;
19422 if (macinfo_type == DW_MACRO_GNU_define
19423 || macinfo_type == DW_MACRO_GNU_undef)
19425 body = read_direct_string (abfd, mac_ptr, &bytes_read);
19426 mac_ptr += bytes_read;
19430 LONGEST str_offset;
19432 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
19433 mac_ptr += offset_size;
19435 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
19436 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
19439 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19441 body = read_indirect_string_from_dwz (dwz, str_offset);
19444 body = read_indirect_string_at_offset (abfd, str_offset);
19447 is_define = (macinfo_type == DW_MACRO_GNU_define
19448 || macinfo_type == DW_MACRO_GNU_define_indirect
19449 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
19450 if (! current_file)
19452 /* DWARF violation as no main source is present. */
19453 complaint (&symfile_complaints,
19454 _("debug info with no main source gives macro %s "
19456 is_define ? _("definition") : _("undefinition"),
19460 if ((line == 0 && !at_commandline)
19461 || (line != 0 && at_commandline))
19462 complaint (&symfile_complaints,
19463 _("debug info gives %s macro %s with %s line %d: %s"),
19464 at_commandline ? _("command-line") : _("in-file"),
19465 is_define ? _("definition") : _("undefinition"),
19466 line == 0 ? _("zero") : _("non-zero"), line, body);
19469 parse_macro_definition (current_file, line, body);
19472 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
19473 || macinfo_type == DW_MACRO_GNU_undef_indirect
19474 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
19475 macro_undef (current_file, line, body);
19480 case DW_MACRO_GNU_start_file:
19482 unsigned int bytes_read;
19485 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19486 mac_ptr += bytes_read;
19487 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19488 mac_ptr += bytes_read;
19490 if ((line == 0 && !at_commandline)
19491 || (line != 0 && at_commandline))
19492 complaint (&symfile_complaints,
19493 _("debug info gives source %d included "
19494 "from %s at %s line %d"),
19495 file, at_commandline ? _("command-line") : _("file"),
19496 line == 0 ? _("zero") : _("non-zero"), line);
19498 if (at_commandline)
19500 /* This DW_MACRO_GNU_start_file was executed in the
19502 at_commandline = 0;
19505 current_file = macro_start_file (file, line,
19506 current_file, comp_dir,
19511 case DW_MACRO_GNU_end_file:
19512 if (! current_file)
19513 complaint (&symfile_complaints,
19514 _("macro debug info has an unmatched "
19515 "`close_file' directive"));
19518 current_file = current_file->included_by;
19519 if (! current_file)
19521 enum dwarf_macro_record_type next_type;
19523 /* GCC circa March 2002 doesn't produce the zero
19524 type byte marking the end of the compilation
19525 unit. Complain if it's not there, but exit no
19528 /* Do we at least have room for a macinfo type byte? */
19529 if (mac_ptr >= mac_end)
19531 dwarf2_section_buffer_overflow_complaint (section);
19535 /* We don't increment mac_ptr here, so this is just
19537 next_type = read_1_byte (abfd, mac_ptr);
19538 if (next_type != 0)
19539 complaint (&symfile_complaints,
19540 _("no terminating 0-type entry for "
19541 "macros in `.debug_macinfo' section"));
19548 case DW_MACRO_GNU_transparent_include:
19549 case DW_MACRO_GNU_transparent_include_alt:
19553 bfd *include_bfd = abfd;
19554 struct dwarf2_section_info *include_section = section;
19555 struct dwarf2_section_info alt_section;
19556 const gdb_byte *include_mac_end = mac_end;
19557 int is_dwz = section_is_dwz;
19558 const gdb_byte *new_mac_ptr;
19560 offset = read_offset_1 (abfd, mac_ptr, offset_size);
19561 mac_ptr += offset_size;
19563 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
19565 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19567 dwarf2_read_section (dwarf2_per_objfile->objfile,
19570 include_bfd = dwz->macro.asection->owner;
19571 include_section = &dwz->macro;
19572 include_mac_end = dwz->macro.buffer + dwz->macro.size;
19576 new_mac_ptr = include_section->buffer + offset;
19577 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
19581 /* This has actually happened; see
19582 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
19583 complaint (&symfile_complaints,
19584 _("recursive DW_MACRO_GNU_transparent_include in "
19585 ".debug_macro section"));
19589 *slot = (void *) new_mac_ptr;
19591 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19592 include_mac_end, current_file,
19594 section, section_is_gnu, is_dwz,
19595 offset_size, objfile, include_hash);
19597 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19602 case DW_MACINFO_vendor_ext:
19603 if (!section_is_gnu)
19605 unsigned int bytes_read;
19608 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19609 mac_ptr += bytes_read;
19610 read_direct_string (abfd, mac_ptr, &bytes_read);
19611 mac_ptr += bytes_read;
19613 /* We don't recognize any vendor extensions. */
19619 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19620 mac_ptr, mac_end, abfd, offset_size,
19622 if (mac_ptr == NULL)
19626 } while (macinfo_type != 0);
19630 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19631 const char *comp_dir, int section_is_gnu)
19633 struct objfile *objfile = dwarf2_per_objfile->objfile;
19634 struct line_header *lh = cu->line_header;
19636 const gdb_byte *mac_ptr, *mac_end;
19637 struct macro_source_file *current_file = 0;
19638 enum dwarf_macro_record_type macinfo_type;
19639 unsigned int offset_size = cu->header.offset_size;
19640 const gdb_byte *opcode_definitions[256];
19641 struct cleanup *cleanup;
19642 htab_t include_hash;
19644 struct dwarf2_section_info *section;
19645 const char *section_name;
19647 if (cu->dwo_unit != NULL)
19649 if (section_is_gnu)
19651 section = &cu->dwo_unit->dwo_file->sections.macro;
19652 section_name = ".debug_macro.dwo";
19656 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19657 section_name = ".debug_macinfo.dwo";
19662 if (section_is_gnu)
19664 section = &dwarf2_per_objfile->macro;
19665 section_name = ".debug_macro";
19669 section = &dwarf2_per_objfile->macinfo;
19670 section_name = ".debug_macinfo";
19674 dwarf2_read_section (objfile, section);
19675 if (section->buffer == NULL)
19677 complaint (&symfile_complaints, _("missing %s section"), section_name);
19680 abfd = section->asection->owner;
19682 /* First pass: Find the name of the base filename.
19683 This filename is needed in order to process all macros whose definition
19684 (or undefinition) comes from the command line. These macros are defined
19685 before the first DW_MACINFO_start_file entry, and yet still need to be
19686 associated to the base file.
19688 To determine the base file name, we scan the macro definitions until we
19689 reach the first DW_MACINFO_start_file entry. We then initialize
19690 CURRENT_FILE accordingly so that any macro definition found before the
19691 first DW_MACINFO_start_file can still be associated to the base file. */
19693 mac_ptr = section->buffer + offset;
19694 mac_end = section->buffer + section->size;
19696 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19697 &offset_size, section_is_gnu);
19698 if (mac_ptr == NULL)
19700 /* We already issued a complaint. */
19706 /* Do we at least have room for a macinfo type byte? */
19707 if (mac_ptr >= mac_end)
19709 /* Complaint is printed during the second pass as GDB will probably
19710 stop the first pass earlier upon finding
19711 DW_MACINFO_start_file. */
19715 macinfo_type = read_1_byte (abfd, mac_ptr);
19718 /* Note that we rely on the fact that the corresponding GNU and
19719 DWARF constants are the same. */
19720 switch (macinfo_type)
19722 /* A zero macinfo type indicates the end of the macro
19727 case DW_MACRO_GNU_define:
19728 case DW_MACRO_GNU_undef:
19729 /* Only skip the data by MAC_PTR. */
19731 unsigned int bytes_read;
19733 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19734 mac_ptr += bytes_read;
19735 read_direct_string (abfd, mac_ptr, &bytes_read);
19736 mac_ptr += bytes_read;
19740 case DW_MACRO_GNU_start_file:
19742 unsigned int bytes_read;
19745 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19746 mac_ptr += bytes_read;
19747 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19748 mac_ptr += bytes_read;
19750 current_file = macro_start_file (file, line, current_file,
19751 comp_dir, lh, objfile);
19755 case DW_MACRO_GNU_end_file:
19756 /* No data to skip by MAC_PTR. */
19759 case DW_MACRO_GNU_define_indirect:
19760 case DW_MACRO_GNU_undef_indirect:
19761 case DW_MACRO_GNU_define_indirect_alt:
19762 case DW_MACRO_GNU_undef_indirect_alt:
19764 unsigned int bytes_read;
19766 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19767 mac_ptr += bytes_read;
19768 mac_ptr += offset_size;
19772 case DW_MACRO_GNU_transparent_include:
19773 case DW_MACRO_GNU_transparent_include_alt:
19774 /* Note that, according to the spec, a transparent include
19775 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19776 skip this opcode. */
19777 mac_ptr += offset_size;
19780 case DW_MACINFO_vendor_ext:
19781 /* Only skip the data by MAC_PTR. */
19782 if (!section_is_gnu)
19784 unsigned int bytes_read;
19786 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19787 mac_ptr += bytes_read;
19788 read_direct_string (abfd, mac_ptr, &bytes_read);
19789 mac_ptr += bytes_read;
19794 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19795 mac_ptr, mac_end, abfd, offset_size,
19797 if (mac_ptr == NULL)
19801 } while (macinfo_type != 0 && current_file == NULL);
19803 /* Second pass: Process all entries.
19805 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19806 command-line macro definitions/undefinitions. This flag is unset when we
19807 reach the first DW_MACINFO_start_file entry. */
19809 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19810 NULL, xcalloc, xfree);
19811 cleanup = make_cleanup_htab_delete (include_hash);
19812 mac_ptr = section->buffer + offset;
19813 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19814 *slot = (void *) mac_ptr;
19815 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19816 current_file, lh, comp_dir, section,
19818 offset_size, objfile, include_hash);
19819 do_cleanups (cleanup);
19822 /* Check if the attribute's form is a DW_FORM_block*
19823 if so return true else false. */
19826 attr_form_is_block (const struct attribute *attr)
19828 return (attr == NULL ? 0 :
19829 attr->form == DW_FORM_block1
19830 || attr->form == DW_FORM_block2
19831 || attr->form == DW_FORM_block4
19832 || attr->form == DW_FORM_block
19833 || attr->form == DW_FORM_exprloc);
19836 /* Return non-zero if ATTR's value is a section offset --- classes
19837 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19838 You may use DW_UNSND (attr) to retrieve such offsets.
19840 Section 7.5.4, "Attribute Encodings", explains that no attribute
19841 may have a value that belongs to more than one of these classes; it
19842 would be ambiguous if we did, because we use the same forms for all
19846 attr_form_is_section_offset (const struct attribute *attr)
19848 return (attr->form == DW_FORM_data4
19849 || attr->form == DW_FORM_data8
19850 || attr->form == DW_FORM_sec_offset);
19853 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19854 zero otherwise. When this function returns true, you can apply
19855 dwarf2_get_attr_constant_value to it.
19857 However, note that for some attributes you must check
19858 attr_form_is_section_offset before using this test. DW_FORM_data4
19859 and DW_FORM_data8 are members of both the constant class, and of
19860 the classes that contain offsets into other debug sections
19861 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19862 that, if an attribute's can be either a constant or one of the
19863 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19864 taken as section offsets, not constants. */
19867 attr_form_is_constant (const struct attribute *attr)
19869 switch (attr->form)
19871 case DW_FORM_sdata:
19872 case DW_FORM_udata:
19873 case DW_FORM_data1:
19874 case DW_FORM_data2:
19875 case DW_FORM_data4:
19876 case DW_FORM_data8:
19884 /* DW_ADDR is always stored already as sect_offset; despite for the forms
19885 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
19888 attr_form_is_ref (const struct attribute *attr)
19890 switch (attr->form)
19892 case DW_FORM_ref_addr:
19897 case DW_FORM_ref_udata:
19898 case DW_FORM_GNU_ref_alt:
19905 /* Return the .debug_loc section to use for CU.
19906 For DWO files use .debug_loc.dwo. */
19908 static struct dwarf2_section_info *
19909 cu_debug_loc_section (struct dwarf2_cu *cu)
19912 return &cu->dwo_unit->dwo_file->sections.loc;
19913 return &dwarf2_per_objfile->loc;
19916 /* A helper function that fills in a dwarf2_loclist_baton. */
19919 fill_in_loclist_baton (struct dwarf2_cu *cu,
19920 struct dwarf2_loclist_baton *baton,
19921 const struct attribute *attr)
19923 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19925 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19927 baton->per_cu = cu->per_cu;
19928 gdb_assert (baton->per_cu);
19929 /* We don't know how long the location list is, but make sure we
19930 don't run off the edge of the section. */
19931 baton->size = section->size - DW_UNSND (attr);
19932 baton->data = section->buffer + DW_UNSND (attr);
19933 baton->base_address = cu->base_address;
19934 baton->from_dwo = cu->dwo_unit != NULL;
19938 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
19939 struct dwarf2_cu *cu, int is_block)
19941 struct objfile *objfile = dwarf2_per_objfile->objfile;
19942 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19944 if (attr_form_is_section_offset (attr)
19945 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19946 the section. If so, fall through to the complaint in the
19948 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19950 struct dwarf2_loclist_baton *baton;
19952 baton = obstack_alloc (&objfile->objfile_obstack,
19953 sizeof (struct dwarf2_loclist_baton));
19955 fill_in_loclist_baton (cu, baton, attr);
19957 if (cu->base_known == 0)
19958 complaint (&symfile_complaints,
19959 _("Location list used without "
19960 "specifying the CU base address."));
19962 SYMBOL_ACLASS_INDEX (sym) = (is_block
19963 ? dwarf2_loclist_block_index
19964 : dwarf2_loclist_index);
19965 SYMBOL_LOCATION_BATON (sym) = baton;
19969 struct dwarf2_locexpr_baton *baton;
19971 baton = obstack_alloc (&objfile->objfile_obstack,
19972 sizeof (struct dwarf2_locexpr_baton));
19973 baton->per_cu = cu->per_cu;
19974 gdb_assert (baton->per_cu);
19976 if (attr_form_is_block (attr))
19978 /* Note that we're just copying the block's data pointer
19979 here, not the actual data. We're still pointing into the
19980 info_buffer for SYM's objfile; right now we never release
19981 that buffer, but when we do clean up properly this may
19983 baton->size = DW_BLOCK (attr)->size;
19984 baton->data = DW_BLOCK (attr)->data;
19988 dwarf2_invalid_attrib_class_complaint ("location description",
19989 SYMBOL_NATURAL_NAME (sym));
19993 SYMBOL_ACLASS_INDEX (sym) = (is_block
19994 ? dwarf2_locexpr_block_index
19995 : dwarf2_locexpr_index);
19996 SYMBOL_LOCATION_BATON (sym) = baton;
20000 /* Return the OBJFILE associated with the compilation unit CU. If CU
20001 came from a separate debuginfo file, then the master objfile is
20005 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
20007 struct objfile *objfile = per_cu->objfile;
20009 /* Return the master objfile, so that we can report and look up the
20010 correct file containing this variable. */
20011 if (objfile->separate_debug_objfile_backlink)
20012 objfile = objfile->separate_debug_objfile_backlink;
20017 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
20018 (CU_HEADERP is unused in such case) or prepare a temporary copy at
20019 CU_HEADERP first. */
20021 static const struct comp_unit_head *
20022 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
20023 struct dwarf2_per_cu_data *per_cu)
20025 const gdb_byte *info_ptr;
20028 return &per_cu->cu->header;
20030 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
20032 memset (cu_headerp, 0, sizeof (*cu_headerp));
20033 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
20038 /* Return the address size given in the compilation unit header for CU. */
20041 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
20043 struct comp_unit_head cu_header_local;
20044 const struct comp_unit_head *cu_headerp;
20046 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20048 return cu_headerp->addr_size;
20051 /* Return the offset size given in the compilation unit header for CU. */
20054 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
20056 struct comp_unit_head cu_header_local;
20057 const struct comp_unit_head *cu_headerp;
20059 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20061 return cu_headerp->offset_size;
20064 /* See its dwarf2loc.h declaration. */
20067 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
20069 struct comp_unit_head cu_header_local;
20070 const struct comp_unit_head *cu_headerp;
20072 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20074 if (cu_headerp->version == 2)
20075 return cu_headerp->addr_size;
20077 return cu_headerp->offset_size;
20080 /* Return the text offset of the CU. The returned offset comes from
20081 this CU's objfile. If this objfile came from a separate debuginfo
20082 file, then the offset may be different from the corresponding
20083 offset in the parent objfile. */
20086 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
20088 struct objfile *objfile = per_cu->objfile;
20090 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20093 /* Locate the .debug_info compilation unit from CU's objfile which contains
20094 the DIE at OFFSET. Raises an error on failure. */
20096 static struct dwarf2_per_cu_data *
20097 dwarf2_find_containing_comp_unit (sect_offset offset,
20098 unsigned int offset_in_dwz,
20099 struct objfile *objfile)
20101 struct dwarf2_per_cu_data *this_cu;
20103 const sect_offset *cu_off;
20106 high = dwarf2_per_objfile->n_comp_units - 1;
20109 struct dwarf2_per_cu_data *mid_cu;
20110 int mid = low + (high - low) / 2;
20112 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
20113 cu_off = &mid_cu->offset;
20114 if (mid_cu->is_dwz > offset_in_dwz
20115 || (mid_cu->is_dwz == offset_in_dwz
20116 && cu_off->sect_off >= offset.sect_off))
20121 gdb_assert (low == high);
20122 this_cu = dwarf2_per_objfile->all_comp_units[low];
20123 cu_off = &this_cu->offset;
20124 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
20126 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
20127 error (_("Dwarf Error: could not find partial DIE containing "
20128 "offset 0x%lx [in module %s]"),
20129 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
20131 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
20132 <= offset.sect_off);
20133 return dwarf2_per_objfile->all_comp_units[low-1];
20137 this_cu = dwarf2_per_objfile->all_comp_units[low];
20138 if (low == dwarf2_per_objfile->n_comp_units - 1
20139 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
20140 error (_("invalid dwarf2 offset %u"), offset.sect_off);
20141 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
20146 /* Initialize dwarf2_cu CU, owned by PER_CU. */
20149 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
20151 memset (cu, 0, sizeof (*cu));
20153 cu->per_cu = per_cu;
20154 cu->objfile = per_cu->objfile;
20155 obstack_init (&cu->comp_unit_obstack);
20158 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
20161 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
20162 enum language pretend_language)
20164 struct attribute *attr;
20166 /* Set the language we're debugging. */
20167 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
20169 set_cu_language (DW_UNSND (attr), cu);
20172 cu->language = pretend_language;
20173 cu->language_defn = language_def (cu->language);
20176 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
20178 cu->producer = DW_STRING (attr);
20181 /* Release one cached compilation unit, CU. We unlink it from the tree
20182 of compilation units, but we don't remove it from the read_in_chain;
20183 the caller is responsible for that.
20184 NOTE: DATA is a void * because this function is also used as a
20185 cleanup routine. */
20188 free_heap_comp_unit (void *data)
20190 struct dwarf2_cu *cu = data;
20192 gdb_assert (cu->per_cu != NULL);
20193 cu->per_cu->cu = NULL;
20196 obstack_free (&cu->comp_unit_obstack, NULL);
20201 /* This cleanup function is passed the address of a dwarf2_cu on the stack
20202 when we're finished with it. We can't free the pointer itself, but be
20203 sure to unlink it from the cache. Also release any associated storage. */
20206 free_stack_comp_unit (void *data)
20208 struct dwarf2_cu *cu = data;
20210 gdb_assert (cu->per_cu != NULL);
20211 cu->per_cu->cu = NULL;
20214 obstack_free (&cu->comp_unit_obstack, NULL);
20215 cu->partial_dies = NULL;
20218 /* Free all cached compilation units. */
20221 free_cached_comp_units (void *data)
20223 struct dwarf2_per_cu_data *per_cu, **last_chain;
20225 per_cu = dwarf2_per_objfile->read_in_chain;
20226 last_chain = &dwarf2_per_objfile->read_in_chain;
20227 while (per_cu != NULL)
20229 struct dwarf2_per_cu_data *next_cu;
20231 next_cu = per_cu->cu->read_in_chain;
20233 free_heap_comp_unit (per_cu->cu);
20234 *last_chain = next_cu;
20240 /* Increase the age counter on each cached compilation unit, and free
20241 any that are too old. */
20244 age_cached_comp_units (void)
20246 struct dwarf2_per_cu_data *per_cu, **last_chain;
20248 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
20249 per_cu = dwarf2_per_objfile->read_in_chain;
20250 while (per_cu != NULL)
20252 per_cu->cu->last_used ++;
20253 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
20254 dwarf2_mark (per_cu->cu);
20255 per_cu = per_cu->cu->read_in_chain;
20258 per_cu = dwarf2_per_objfile->read_in_chain;
20259 last_chain = &dwarf2_per_objfile->read_in_chain;
20260 while (per_cu != NULL)
20262 struct dwarf2_per_cu_data *next_cu;
20264 next_cu = per_cu->cu->read_in_chain;
20266 if (!per_cu->cu->mark)
20268 free_heap_comp_unit (per_cu->cu);
20269 *last_chain = next_cu;
20272 last_chain = &per_cu->cu->read_in_chain;
20278 /* Remove a single compilation unit from the cache. */
20281 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
20283 struct dwarf2_per_cu_data *per_cu, **last_chain;
20285 per_cu = dwarf2_per_objfile->read_in_chain;
20286 last_chain = &dwarf2_per_objfile->read_in_chain;
20287 while (per_cu != NULL)
20289 struct dwarf2_per_cu_data *next_cu;
20291 next_cu = per_cu->cu->read_in_chain;
20293 if (per_cu == target_per_cu)
20295 free_heap_comp_unit (per_cu->cu);
20297 *last_chain = next_cu;
20301 last_chain = &per_cu->cu->read_in_chain;
20307 /* Release all extra memory associated with OBJFILE. */
20310 dwarf2_free_objfile (struct objfile *objfile)
20312 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20314 if (dwarf2_per_objfile == NULL)
20317 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
20318 free_cached_comp_units (NULL);
20320 if (dwarf2_per_objfile->quick_file_names_table)
20321 htab_delete (dwarf2_per_objfile->quick_file_names_table);
20323 /* Everything else should be on the objfile obstack. */
20326 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
20327 We store these in a hash table separate from the DIEs, and preserve them
20328 when the DIEs are flushed out of cache.
20330 The CU "per_cu" pointer is needed because offset alone is not enough to
20331 uniquely identify the type. A file may have multiple .debug_types sections,
20332 or the type may come from a DWO file. Furthermore, while it's more logical
20333 to use per_cu->section+offset, with Fission the section with the data is in
20334 the DWO file but we don't know that section at the point we need it.
20335 We have to use something in dwarf2_per_cu_data (or the pointer to it)
20336 because we can enter the lookup routine, get_die_type_at_offset, from
20337 outside this file, and thus won't necessarily have PER_CU->cu.
20338 Fortunately, PER_CU is stable for the life of the objfile. */
20340 struct dwarf2_per_cu_offset_and_type
20342 const struct dwarf2_per_cu_data *per_cu;
20343 sect_offset offset;
20347 /* Hash function for a dwarf2_per_cu_offset_and_type. */
20350 per_cu_offset_and_type_hash (const void *item)
20352 const struct dwarf2_per_cu_offset_and_type *ofs = item;
20354 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
20357 /* Equality function for a dwarf2_per_cu_offset_and_type. */
20360 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
20362 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
20363 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
20365 return (ofs_lhs->per_cu == ofs_rhs->per_cu
20366 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
20369 /* Set the type associated with DIE to TYPE. Save it in CU's hash
20370 table if necessary. For convenience, return TYPE.
20372 The DIEs reading must have careful ordering to:
20373 * Not cause infite loops trying to read in DIEs as a prerequisite for
20374 reading current DIE.
20375 * Not trying to dereference contents of still incompletely read in types
20376 while reading in other DIEs.
20377 * Enable referencing still incompletely read in types just by a pointer to
20378 the type without accessing its fields.
20380 Therefore caller should follow these rules:
20381 * Try to fetch any prerequisite types we may need to build this DIE type
20382 before building the type and calling set_die_type.
20383 * After building type call set_die_type for current DIE as soon as
20384 possible before fetching more types to complete the current type.
20385 * Make the type as complete as possible before fetching more types. */
20387 static struct type *
20388 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20390 struct dwarf2_per_cu_offset_and_type **slot, ofs;
20391 struct objfile *objfile = cu->objfile;
20393 /* For Ada types, make sure that the gnat-specific data is always
20394 initialized (if not already set). There are a few types where
20395 we should not be doing so, because the type-specific area is
20396 already used to hold some other piece of info (eg: TYPE_CODE_FLT
20397 where the type-specific area is used to store the floatformat).
20398 But this is not a problem, because the gnat-specific information
20399 is actually not needed for these types. */
20400 if (need_gnat_info (cu)
20401 && TYPE_CODE (type) != TYPE_CODE_FUNC
20402 && TYPE_CODE (type) != TYPE_CODE_FLT
20403 && !HAVE_GNAT_AUX_INFO (type))
20404 INIT_GNAT_SPECIFIC (type);
20406 if (dwarf2_per_objfile->die_type_hash == NULL)
20408 dwarf2_per_objfile->die_type_hash =
20409 htab_create_alloc_ex (127,
20410 per_cu_offset_and_type_hash,
20411 per_cu_offset_and_type_eq,
20413 &objfile->objfile_obstack,
20414 hashtab_obstack_allocate,
20415 dummy_obstack_deallocate);
20418 ofs.per_cu = cu->per_cu;
20419 ofs.offset = die->offset;
20421 slot = (struct dwarf2_per_cu_offset_and_type **)
20422 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
20424 complaint (&symfile_complaints,
20425 _("A problem internal to GDB: DIE 0x%x has type already set"),
20426 die->offset.sect_off);
20427 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
20432 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
20433 or return NULL if the die does not have a saved type. */
20435 static struct type *
20436 get_die_type_at_offset (sect_offset offset,
20437 struct dwarf2_per_cu_data *per_cu)
20439 struct dwarf2_per_cu_offset_and_type *slot, ofs;
20441 if (dwarf2_per_objfile->die_type_hash == NULL)
20444 ofs.per_cu = per_cu;
20445 ofs.offset = offset;
20446 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
20453 /* Look up the type for DIE in CU in die_type_hash,
20454 or return NULL if DIE does not have a saved type. */
20456 static struct type *
20457 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
20459 return get_die_type_at_offset (die->offset, cu->per_cu);
20462 /* Add a dependence relationship from CU to REF_PER_CU. */
20465 dwarf2_add_dependence (struct dwarf2_cu *cu,
20466 struct dwarf2_per_cu_data *ref_per_cu)
20470 if (cu->dependencies == NULL)
20472 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
20473 NULL, &cu->comp_unit_obstack,
20474 hashtab_obstack_allocate,
20475 dummy_obstack_deallocate);
20477 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
20479 *slot = ref_per_cu;
20482 /* Subroutine of dwarf2_mark to pass to htab_traverse.
20483 Set the mark field in every compilation unit in the
20484 cache that we must keep because we are keeping CU. */
20487 dwarf2_mark_helper (void **slot, void *data)
20489 struct dwarf2_per_cu_data *per_cu;
20491 per_cu = (struct dwarf2_per_cu_data *) *slot;
20493 /* cu->dependencies references may not yet have been ever read if QUIT aborts
20494 reading of the chain. As such dependencies remain valid it is not much
20495 useful to track and undo them during QUIT cleanups. */
20496 if (per_cu->cu == NULL)
20499 if (per_cu->cu->mark)
20501 per_cu->cu->mark = 1;
20503 if (per_cu->cu->dependencies != NULL)
20504 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
20509 /* Set the mark field in CU and in every other compilation unit in the
20510 cache that we must keep because we are keeping CU. */
20513 dwarf2_mark (struct dwarf2_cu *cu)
20518 if (cu->dependencies != NULL)
20519 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
20523 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
20527 per_cu->cu->mark = 0;
20528 per_cu = per_cu->cu->read_in_chain;
20532 /* Trivial hash function for partial_die_info: the hash value of a DIE
20533 is its offset in .debug_info for this objfile. */
20536 partial_die_hash (const void *item)
20538 const struct partial_die_info *part_die = item;
20540 return part_die->offset.sect_off;
20543 /* Trivial comparison function for partial_die_info structures: two DIEs
20544 are equal if they have the same offset. */
20547 partial_die_eq (const void *item_lhs, const void *item_rhs)
20549 const struct partial_die_info *part_die_lhs = item_lhs;
20550 const struct partial_die_info *part_die_rhs = item_rhs;
20552 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
20555 static struct cmd_list_element *set_dwarf2_cmdlist;
20556 static struct cmd_list_element *show_dwarf2_cmdlist;
20559 set_dwarf2_cmd (char *args, int from_tty)
20561 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
20565 show_dwarf2_cmd (char *args, int from_tty)
20567 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
20570 /* Free data associated with OBJFILE, if necessary. */
20573 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
20575 struct dwarf2_per_objfile *data = d;
20578 /* Make sure we don't accidentally use dwarf2_per_objfile while
20580 dwarf2_per_objfile = NULL;
20582 for (ix = 0; ix < data->n_comp_units; ++ix)
20583 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
20585 for (ix = 0; ix < data->n_type_units; ++ix)
20586 VEC_free (dwarf2_per_cu_ptr,
20587 data->all_type_units[ix]->per_cu.imported_symtabs);
20588 xfree (data->all_type_units);
20590 VEC_free (dwarf2_section_info_def, data->types);
20592 if (data->dwo_files)
20593 free_dwo_files (data->dwo_files, objfile);
20594 if (data->dwp_file)
20595 gdb_bfd_unref (data->dwp_file->dbfd);
20597 if (data->dwz_file && data->dwz_file->dwz_bfd)
20598 gdb_bfd_unref (data->dwz_file->dwz_bfd);
20602 /* The "save gdb-index" command. */
20604 /* The contents of the hash table we create when building the string
20606 struct strtab_entry
20608 offset_type offset;
20612 /* Hash function for a strtab_entry.
20614 Function is used only during write_hash_table so no index format backward
20615 compatibility is needed. */
20618 hash_strtab_entry (const void *e)
20620 const struct strtab_entry *entry = e;
20621 return mapped_index_string_hash (INT_MAX, entry->str);
20624 /* Equality function for a strtab_entry. */
20627 eq_strtab_entry (const void *a, const void *b)
20629 const struct strtab_entry *ea = a;
20630 const struct strtab_entry *eb = b;
20631 return !strcmp (ea->str, eb->str);
20634 /* Create a strtab_entry hash table. */
20637 create_strtab (void)
20639 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
20640 xfree, xcalloc, xfree);
20643 /* Add a string to the constant pool. Return the string's offset in
20647 add_string (htab_t table, struct obstack *cpool, const char *str)
20650 struct strtab_entry entry;
20651 struct strtab_entry *result;
20654 slot = htab_find_slot (table, &entry, INSERT);
20659 result = XNEW (struct strtab_entry);
20660 result->offset = obstack_object_size (cpool);
20662 obstack_grow_str0 (cpool, str);
20665 return result->offset;
20668 /* An entry in the symbol table. */
20669 struct symtab_index_entry
20671 /* The name of the symbol. */
20673 /* The offset of the name in the constant pool. */
20674 offset_type index_offset;
20675 /* A sorted vector of the indices of all the CUs that hold an object
20677 VEC (offset_type) *cu_indices;
20680 /* The symbol table. This is a power-of-2-sized hash table. */
20681 struct mapped_symtab
20683 offset_type n_elements;
20685 struct symtab_index_entry **data;
20688 /* Hash function for a symtab_index_entry. */
20691 hash_symtab_entry (const void *e)
20693 const struct symtab_index_entry *entry = e;
20694 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
20695 sizeof (offset_type) * VEC_length (offset_type,
20696 entry->cu_indices),
20700 /* Equality function for a symtab_index_entry. */
20703 eq_symtab_entry (const void *a, const void *b)
20705 const struct symtab_index_entry *ea = a;
20706 const struct symtab_index_entry *eb = b;
20707 int len = VEC_length (offset_type, ea->cu_indices);
20708 if (len != VEC_length (offset_type, eb->cu_indices))
20710 return !memcmp (VEC_address (offset_type, ea->cu_indices),
20711 VEC_address (offset_type, eb->cu_indices),
20712 sizeof (offset_type) * len);
20715 /* Destroy a symtab_index_entry. */
20718 delete_symtab_entry (void *p)
20720 struct symtab_index_entry *entry = p;
20721 VEC_free (offset_type, entry->cu_indices);
20725 /* Create a hash table holding symtab_index_entry objects. */
20728 create_symbol_hash_table (void)
20730 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
20731 delete_symtab_entry, xcalloc, xfree);
20734 /* Create a new mapped symtab object. */
20736 static struct mapped_symtab *
20737 create_mapped_symtab (void)
20739 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20740 symtab->n_elements = 0;
20741 symtab->size = 1024;
20742 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20746 /* Destroy a mapped_symtab. */
20749 cleanup_mapped_symtab (void *p)
20751 struct mapped_symtab *symtab = p;
20752 /* The contents of the array are freed when the other hash table is
20754 xfree (symtab->data);
20758 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20761 Function is used only during write_hash_table so no index format backward
20762 compatibility is needed. */
20764 static struct symtab_index_entry **
20765 find_slot (struct mapped_symtab *symtab, const char *name)
20767 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20769 index = hash & (symtab->size - 1);
20770 step = ((hash * 17) & (symtab->size - 1)) | 1;
20774 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20775 return &symtab->data[index];
20776 index = (index + step) & (symtab->size - 1);
20780 /* Expand SYMTAB's hash table. */
20783 hash_expand (struct mapped_symtab *symtab)
20785 offset_type old_size = symtab->size;
20787 struct symtab_index_entry **old_entries = symtab->data;
20790 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20792 for (i = 0; i < old_size; ++i)
20794 if (old_entries[i])
20796 struct symtab_index_entry **slot = find_slot (symtab,
20797 old_entries[i]->name);
20798 *slot = old_entries[i];
20802 xfree (old_entries);
20805 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20806 CU_INDEX is the index of the CU in which the symbol appears.
20807 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20810 add_index_entry (struct mapped_symtab *symtab, const char *name,
20811 int is_static, gdb_index_symbol_kind kind,
20812 offset_type cu_index)
20814 struct symtab_index_entry **slot;
20815 offset_type cu_index_and_attrs;
20817 ++symtab->n_elements;
20818 if (4 * symtab->n_elements / 3 >= symtab->size)
20819 hash_expand (symtab);
20821 slot = find_slot (symtab, name);
20824 *slot = XNEW (struct symtab_index_entry);
20825 (*slot)->name = name;
20826 /* index_offset is set later. */
20827 (*slot)->cu_indices = NULL;
20830 cu_index_and_attrs = 0;
20831 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20832 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20833 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20835 /* We don't want to record an index value twice as we want to avoid the
20837 We process all global symbols and then all static symbols
20838 (which would allow us to avoid the duplication by only having to check
20839 the last entry pushed), but a symbol could have multiple kinds in one CU.
20840 To keep things simple we don't worry about the duplication here and
20841 sort and uniqufy the list after we've processed all symbols. */
20842 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20845 /* qsort helper routine for uniquify_cu_indices. */
20848 offset_type_compare (const void *ap, const void *bp)
20850 offset_type a = *(offset_type *) ap;
20851 offset_type b = *(offset_type *) bp;
20853 return (a > b) - (b > a);
20856 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20859 uniquify_cu_indices (struct mapped_symtab *symtab)
20863 for (i = 0; i < symtab->size; ++i)
20865 struct symtab_index_entry *entry = symtab->data[i];
20868 && entry->cu_indices != NULL)
20870 unsigned int next_to_insert, next_to_check;
20871 offset_type last_value;
20873 qsort (VEC_address (offset_type, entry->cu_indices),
20874 VEC_length (offset_type, entry->cu_indices),
20875 sizeof (offset_type), offset_type_compare);
20877 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20878 next_to_insert = 1;
20879 for (next_to_check = 1;
20880 next_to_check < VEC_length (offset_type, entry->cu_indices);
20883 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20886 last_value = VEC_index (offset_type, entry->cu_indices,
20888 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20893 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20898 /* Add a vector of indices to the constant pool. */
20901 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20902 struct symtab_index_entry *entry)
20906 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20909 offset_type len = VEC_length (offset_type, entry->cu_indices);
20910 offset_type val = MAYBE_SWAP (len);
20915 entry->index_offset = obstack_object_size (cpool);
20917 obstack_grow (cpool, &val, sizeof (val));
20919 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20922 val = MAYBE_SWAP (iter);
20923 obstack_grow (cpool, &val, sizeof (val));
20928 struct symtab_index_entry *old_entry = *slot;
20929 entry->index_offset = old_entry->index_offset;
20932 return entry->index_offset;
20935 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20936 constant pool entries going into the obstack CPOOL. */
20939 write_hash_table (struct mapped_symtab *symtab,
20940 struct obstack *output, struct obstack *cpool)
20943 htab_t symbol_hash_table;
20946 symbol_hash_table = create_symbol_hash_table ();
20947 str_table = create_strtab ();
20949 /* We add all the index vectors to the constant pool first, to
20950 ensure alignment is ok. */
20951 for (i = 0; i < symtab->size; ++i)
20953 if (symtab->data[i])
20954 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20957 /* Now write out the hash table. */
20958 for (i = 0; i < symtab->size; ++i)
20960 offset_type str_off, vec_off;
20962 if (symtab->data[i])
20964 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20965 vec_off = symtab->data[i]->index_offset;
20969 /* While 0 is a valid constant pool index, it is not valid
20970 to have 0 for both offsets. */
20975 str_off = MAYBE_SWAP (str_off);
20976 vec_off = MAYBE_SWAP (vec_off);
20978 obstack_grow (output, &str_off, sizeof (str_off));
20979 obstack_grow (output, &vec_off, sizeof (vec_off));
20982 htab_delete (str_table);
20983 htab_delete (symbol_hash_table);
20986 /* Struct to map psymtab to CU index in the index file. */
20987 struct psymtab_cu_index_map
20989 struct partial_symtab *psymtab;
20990 unsigned int cu_index;
20994 hash_psymtab_cu_index (const void *item)
20996 const struct psymtab_cu_index_map *map = item;
20998 return htab_hash_pointer (map->psymtab);
21002 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
21004 const struct psymtab_cu_index_map *lhs = item_lhs;
21005 const struct psymtab_cu_index_map *rhs = item_rhs;
21007 return lhs->psymtab == rhs->psymtab;
21010 /* Helper struct for building the address table. */
21011 struct addrmap_index_data
21013 struct objfile *objfile;
21014 struct obstack *addr_obstack;
21015 htab_t cu_index_htab;
21017 /* Non-zero if the previous_* fields are valid.
21018 We can't write an entry until we see the next entry (since it is only then
21019 that we know the end of the entry). */
21020 int previous_valid;
21021 /* Index of the CU in the table of all CUs in the index file. */
21022 unsigned int previous_cu_index;
21023 /* Start address of the CU. */
21024 CORE_ADDR previous_cu_start;
21027 /* Write an address entry to OBSTACK. */
21030 add_address_entry (struct objfile *objfile, struct obstack *obstack,
21031 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
21033 offset_type cu_index_to_write;
21035 CORE_ADDR baseaddr;
21037 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21039 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
21040 obstack_grow (obstack, addr, 8);
21041 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
21042 obstack_grow (obstack, addr, 8);
21043 cu_index_to_write = MAYBE_SWAP (cu_index);
21044 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
21047 /* Worker function for traversing an addrmap to build the address table. */
21050 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
21052 struct addrmap_index_data *data = datap;
21053 struct partial_symtab *pst = obj;
21055 if (data->previous_valid)
21056 add_address_entry (data->objfile, data->addr_obstack,
21057 data->previous_cu_start, start_addr,
21058 data->previous_cu_index);
21060 data->previous_cu_start = start_addr;
21063 struct psymtab_cu_index_map find_map, *map;
21064 find_map.psymtab = pst;
21065 map = htab_find (data->cu_index_htab, &find_map);
21066 gdb_assert (map != NULL);
21067 data->previous_cu_index = map->cu_index;
21068 data->previous_valid = 1;
21071 data->previous_valid = 0;
21076 /* Write OBJFILE's address map to OBSTACK.
21077 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
21078 in the index file. */
21081 write_address_map (struct objfile *objfile, struct obstack *obstack,
21082 htab_t cu_index_htab)
21084 struct addrmap_index_data addrmap_index_data;
21086 /* When writing the address table, we have to cope with the fact that
21087 the addrmap iterator only provides the start of a region; we have to
21088 wait until the next invocation to get the start of the next region. */
21090 addrmap_index_data.objfile = objfile;
21091 addrmap_index_data.addr_obstack = obstack;
21092 addrmap_index_data.cu_index_htab = cu_index_htab;
21093 addrmap_index_data.previous_valid = 0;
21095 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
21096 &addrmap_index_data);
21098 /* It's highly unlikely the last entry (end address = 0xff...ff)
21099 is valid, but we should still handle it.
21100 The end address is recorded as the start of the next region, but that
21101 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
21103 if (addrmap_index_data.previous_valid)
21104 add_address_entry (objfile, obstack,
21105 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
21106 addrmap_index_data.previous_cu_index);
21109 /* Return the symbol kind of PSYM. */
21111 static gdb_index_symbol_kind
21112 symbol_kind (struct partial_symbol *psym)
21114 domain_enum domain = PSYMBOL_DOMAIN (psym);
21115 enum address_class aclass = PSYMBOL_CLASS (psym);
21123 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
21125 return GDB_INDEX_SYMBOL_KIND_TYPE;
21127 case LOC_CONST_BYTES:
21128 case LOC_OPTIMIZED_OUT:
21130 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21132 /* Note: It's currently impossible to recognize psyms as enum values
21133 short of reading the type info. For now punt. */
21134 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21136 /* There are other LOC_FOO values that one might want to classify
21137 as variables, but dwarf2read.c doesn't currently use them. */
21138 return GDB_INDEX_SYMBOL_KIND_OTHER;
21140 case STRUCT_DOMAIN:
21141 return GDB_INDEX_SYMBOL_KIND_TYPE;
21143 return GDB_INDEX_SYMBOL_KIND_OTHER;
21147 /* Add a list of partial symbols to SYMTAB. */
21150 write_psymbols (struct mapped_symtab *symtab,
21152 struct partial_symbol **psymp,
21154 offset_type cu_index,
21157 for (; count-- > 0; ++psymp)
21159 struct partial_symbol *psym = *psymp;
21162 if (SYMBOL_LANGUAGE (psym) == language_ada)
21163 error (_("Ada is not currently supported by the index"));
21165 /* Only add a given psymbol once. */
21166 slot = htab_find_slot (psyms_seen, psym, INSERT);
21169 gdb_index_symbol_kind kind = symbol_kind (psym);
21172 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
21173 is_static, kind, cu_index);
21178 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
21179 exception if there is an error. */
21182 write_obstack (FILE *file, struct obstack *obstack)
21184 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
21186 != obstack_object_size (obstack))
21187 error (_("couldn't data write to file"));
21190 /* Unlink a file if the argument is not NULL. */
21193 unlink_if_set (void *p)
21195 char **filename = p;
21197 unlink (*filename);
21200 /* A helper struct used when iterating over debug_types. */
21201 struct signatured_type_index_data
21203 struct objfile *objfile;
21204 struct mapped_symtab *symtab;
21205 struct obstack *types_list;
21210 /* A helper function that writes a single signatured_type to an
21214 write_one_signatured_type (void **slot, void *d)
21216 struct signatured_type_index_data *info = d;
21217 struct signatured_type *entry = (struct signatured_type *) *slot;
21218 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
21221 write_psymbols (info->symtab,
21223 info->objfile->global_psymbols.list
21224 + psymtab->globals_offset,
21225 psymtab->n_global_syms, info->cu_index,
21227 write_psymbols (info->symtab,
21229 info->objfile->static_psymbols.list
21230 + psymtab->statics_offset,
21231 psymtab->n_static_syms, info->cu_index,
21234 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21235 entry->per_cu.offset.sect_off);
21236 obstack_grow (info->types_list, val, 8);
21237 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21238 entry->type_offset_in_tu.cu_off);
21239 obstack_grow (info->types_list, val, 8);
21240 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
21241 obstack_grow (info->types_list, val, 8);
21248 /* Recurse into all "included" dependencies and write their symbols as
21249 if they appeared in this psymtab. */
21252 recursively_write_psymbols (struct objfile *objfile,
21253 struct partial_symtab *psymtab,
21254 struct mapped_symtab *symtab,
21256 offset_type cu_index)
21260 for (i = 0; i < psymtab->number_of_dependencies; ++i)
21261 if (psymtab->dependencies[i]->user != NULL)
21262 recursively_write_psymbols (objfile, psymtab->dependencies[i],
21263 symtab, psyms_seen, cu_index);
21265 write_psymbols (symtab,
21267 objfile->global_psymbols.list + psymtab->globals_offset,
21268 psymtab->n_global_syms, cu_index,
21270 write_psymbols (symtab,
21272 objfile->static_psymbols.list + psymtab->statics_offset,
21273 psymtab->n_static_syms, cu_index,
21277 /* Create an index file for OBJFILE in the directory DIR. */
21280 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
21282 struct cleanup *cleanup;
21283 char *filename, *cleanup_filename;
21284 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
21285 struct obstack cu_list, types_cu_list;
21288 struct mapped_symtab *symtab;
21289 offset_type val, size_of_contents, total_len;
21292 htab_t cu_index_htab;
21293 struct psymtab_cu_index_map *psymtab_cu_index_map;
21295 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
21298 if (dwarf2_per_objfile->using_index)
21299 error (_("Cannot use an index to create the index"));
21301 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
21302 error (_("Cannot make an index when the file has multiple .debug_types sections"));
21304 if (stat (objfile->name, &st) < 0)
21305 perror_with_name (objfile->name);
21307 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
21308 INDEX_SUFFIX, (char *) NULL);
21309 cleanup = make_cleanup (xfree, filename);
21311 out_file = gdb_fopen_cloexec (filename, "wb");
21313 error (_("Can't open `%s' for writing"), filename);
21315 cleanup_filename = filename;
21316 make_cleanup (unlink_if_set, &cleanup_filename);
21318 symtab = create_mapped_symtab ();
21319 make_cleanup (cleanup_mapped_symtab, symtab);
21321 obstack_init (&addr_obstack);
21322 make_cleanup_obstack_free (&addr_obstack);
21324 obstack_init (&cu_list);
21325 make_cleanup_obstack_free (&cu_list);
21327 obstack_init (&types_cu_list);
21328 make_cleanup_obstack_free (&types_cu_list);
21330 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
21331 NULL, xcalloc, xfree);
21332 make_cleanup_htab_delete (psyms_seen);
21334 /* While we're scanning CU's create a table that maps a psymtab pointer
21335 (which is what addrmap records) to its index (which is what is recorded
21336 in the index file). This will later be needed to write the address
21338 cu_index_htab = htab_create_alloc (100,
21339 hash_psymtab_cu_index,
21340 eq_psymtab_cu_index,
21341 NULL, xcalloc, xfree);
21342 make_cleanup_htab_delete (cu_index_htab);
21343 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
21344 xmalloc (sizeof (struct psymtab_cu_index_map)
21345 * dwarf2_per_objfile->n_comp_units);
21346 make_cleanup (xfree, psymtab_cu_index_map);
21348 /* The CU list is already sorted, so we don't need to do additional
21349 work here. Also, the debug_types entries do not appear in
21350 all_comp_units, but only in their own hash table. */
21351 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
21353 struct dwarf2_per_cu_data *per_cu
21354 = dwarf2_per_objfile->all_comp_units[i];
21355 struct partial_symtab *psymtab = per_cu->v.psymtab;
21357 struct psymtab_cu_index_map *map;
21360 /* CU of a shared file from 'dwz -m' may be unused by this main file.
21361 It may be referenced from a local scope but in such case it does not
21362 need to be present in .gdb_index. */
21363 if (psymtab == NULL)
21366 if (psymtab->user == NULL)
21367 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
21369 map = &psymtab_cu_index_map[i];
21370 map->psymtab = psymtab;
21372 slot = htab_find_slot (cu_index_htab, map, INSERT);
21373 gdb_assert (slot != NULL);
21374 gdb_assert (*slot == NULL);
21377 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21378 per_cu->offset.sect_off);
21379 obstack_grow (&cu_list, val, 8);
21380 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
21381 obstack_grow (&cu_list, val, 8);
21384 /* Dump the address map. */
21385 write_address_map (objfile, &addr_obstack, cu_index_htab);
21387 /* Write out the .debug_type entries, if any. */
21388 if (dwarf2_per_objfile->signatured_types)
21390 struct signatured_type_index_data sig_data;
21392 sig_data.objfile = objfile;
21393 sig_data.symtab = symtab;
21394 sig_data.types_list = &types_cu_list;
21395 sig_data.psyms_seen = psyms_seen;
21396 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
21397 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
21398 write_one_signatured_type, &sig_data);
21401 /* Now that we've processed all symbols we can shrink their cu_indices
21403 uniquify_cu_indices (symtab);
21405 obstack_init (&constant_pool);
21406 make_cleanup_obstack_free (&constant_pool);
21407 obstack_init (&symtab_obstack);
21408 make_cleanup_obstack_free (&symtab_obstack);
21409 write_hash_table (symtab, &symtab_obstack, &constant_pool);
21411 obstack_init (&contents);
21412 make_cleanup_obstack_free (&contents);
21413 size_of_contents = 6 * sizeof (offset_type);
21414 total_len = size_of_contents;
21416 /* The version number. */
21417 val = MAYBE_SWAP (8);
21418 obstack_grow (&contents, &val, sizeof (val));
21420 /* The offset of the CU list from the start of the file. */
21421 val = MAYBE_SWAP (total_len);
21422 obstack_grow (&contents, &val, sizeof (val));
21423 total_len += obstack_object_size (&cu_list);
21425 /* The offset of the types CU list from the start of the file. */
21426 val = MAYBE_SWAP (total_len);
21427 obstack_grow (&contents, &val, sizeof (val));
21428 total_len += obstack_object_size (&types_cu_list);
21430 /* The offset of the address table from the start of the file. */
21431 val = MAYBE_SWAP (total_len);
21432 obstack_grow (&contents, &val, sizeof (val));
21433 total_len += obstack_object_size (&addr_obstack);
21435 /* The offset of the symbol table from the start of the file. */
21436 val = MAYBE_SWAP (total_len);
21437 obstack_grow (&contents, &val, sizeof (val));
21438 total_len += obstack_object_size (&symtab_obstack);
21440 /* The offset of the constant pool from the start of the file. */
21441 val = MAYBE_SWAP (total_len);
21442 obstack_grow (&contents, &val, sizeof (val));
21443 total_len += obstack_object_size (&constant_pool);
21445 gdb_assert (obstack_object_size (&contents) == size_of_contents);
21447 write_obstack (out_file, &contents);
21448 write_obstack (out_file, &cu_list);
21449 write_obstack (out_file, &types_cu_list);
21450 write_obstack (out_file, &addr_obstack);
21451 write_obstack (out_file, &symtab_obstack);
21452 write_obstack (out_file, &constant_pool);
21456 /* We want to keep the file, so we set cleanup_filename to NULL
21457 here. See unlink_if_set. */
21458 cleanup_filename = NULL;
21460 do_cleanups (cleanup);
21463 /* Implementation of the `save gdb-index' command.
21465 Note that the file format used by this command is documented in the
21466 GDB manual. Any changes here must be documented there. */
21469 save_gdb_index_command (char *arg, int from_tty)
21471 struct objfile *objfile;
21474 error (_("usage: save gdb-index DIRECTORY"));
21476 ALL_OBJFILES (objfile)
21480 /* If the objfile does not correspond to an actual file, skip it. */
21481 if (stat (objfile->name, &st) < 0)
21484 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21485 if (dwarf2_per_objfile)
21487 volatile struct gdb_exception except;
21489 TRY_CATCH (except, RETURN_MASK_ERROR)
21491 write_psymtabs_to_index (objfile, arg);
21493 if (except.reason < 0)
21494 exception_fprintf (gdb_stderr, except,
21495 _("Error while writing index for `%s': "),
21503 int dwarf2_always_disassemble;
21506 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
21507 struct cmd_list_element *c, const char *value)
21509 fprintf_filtered (file,
21510 _("Whether to always disassemble "
21511 "DWARF expressions is %s.\n"),
21516 show_check_physname (struct ui_file *file, int from_tty,
21517 struct cmd_list_element *c, const char *value)
21519 fprintf_filtered (file,
21520 _("Whether to check \"physname\" is %s.\n"),
21524 void _initialize_dwarf2_read (void);
21527 _initialize_dwarf2_read (void)
21529 struct cmd_list_element *c;
21531 dwarf2_objfile_data_key
21532 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
21534 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
21535 Set DWARF 2 specific variables.\n\
21536 Configure DWARF 2 variables such as the cache size"),
21537 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
21538 0/*allow-unknown*/, &maintenance_set_cmdlist);
21540 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
21541 Show DWARF 2 specific variables\n\
21542 Show DWARF 2 variables such as the cache size"),
21543 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
21544 0/*allow-unknown*/, &maintenance_show_cmdlist);
21546 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
21547 &dwarf2_max_cache_age, _("\
21548 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
21549 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
21550 A higher limit means that cached compilation units will be stored\n\
21551 in memory longer, and more total memory will be used. Zero disables\n\
21552 caching, which can slow down startup."),
21554 show_dwarf2_max_cache_age,
21555 &set_dwarf2_cmdlist,
21556 &show_dwarf2_cmdlist);
21558 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
21559 &dwarf2_always_disassemble, _("\
21560 Set whether `info address' always disassembles DWARF expressions."), _("\
21561 Show whether `info address' always disassembles DWARF expressions."), _("\
21562 When enabled, DWARF expressions are always printed in an assembly-like\n\
21563 syntax. When disabled, expressions will be printed in a more\n\
21564 conversational style, when possible."),
21566 show_dwarf2_always_disassemble,
21567 &set_dwarf2_cmdlist,
21568 &show_dwarf2_cmdlist);
21570 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
21571 Set debugging of the dwarf2 reader."), _("\
21572 Show debugging of the dwarf2 reader."), _("\
21573 When enabled, debugging messages are printed during dwarf2 reading\n\
21574 and symtab expansion."),
21577 &setdebuglist, &showdebuglist);
21579 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
21580 Set debugging of the dwarf2 DIE reader."), _("\
21581 Show debugging of the dwarf2 DIE reader."), _("\
21582 When enabled (non-zero), DIEs are dumped after they are read in.\n\
21583 The value is the maximum depth to print."),
21586 &setdebuglist, &showdebuglist);
21588 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
21589 Set cross-checking of \"physname\" code against demangler."), _("\
21590 Show cross-checking of \"physname\" code against demangler."), _("\
21591 When enabled, GDB's internal \"physname\" code is checked against\n\
21593 NULL, show_check_physname,
21594 &setdebuglist, &showdebuglist);
21596 add_setshow_boolean_cmd ("use-deprecated-index-sections",
21597 no_class, &use_deprecated_index_sections, _("\
21598 Set whether to use deprecated gdb_index sections."), _("\
21599 Show whether to use deprecated gdb_index sections."), _("\
21600 When enabled, deprecated .gdb_index sections are used anyway.\n\
21601 Normally they are ignored either because of a missing feature or\n\
21602 performance issue.\n\
21603 Warning: This option must be enabled before gdb reads the file."),
21606 &setlist, &showlist);
21608 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
21610 Save a gdb-index file.\n\
21611 Usage: save gdb-index DIRECTORY"),
21613 set_cmd_completer (c, filename_completer);
21615 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
21616 &dwarf2_locexpr_funcs);
21617 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
21618 &dwarf2_loclist_funcs);
21620 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
21621 &dwarf2_block_frame_base_locexpr_funcs);
21622 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
21623 &dwarf2_block_frame_base_loclist_funcs);