1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2013 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
45 #include "complaints.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
55 #include "typeprint.h"
58 #include "exceptions.h"
60 #include "completer.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "filestuff.h"
74 #include "gdb_string.h"
75 #include "gdb_assert.h"
76 #include <sys/types.h>
78 typedef struct symbol *symbolp;
81 /* When non-zero, print basic high level tracing messages.
82 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
83 static int dwarf2_read_debug = 0;
85 /* When non-zero, dump DIEs after they are read in. */
86 static unsigned int dwarf2_die_debug = 0;
88 /* When non-zero, cross-check physname against demangler. */
89 static int check_physname = 0;
91 /* When non-zero, do not reject deprecated .gdb_index sections. */
92 static int use_deprecated_index_sections = 0;
94 static const struct objfile_data *dwarf2_objfile_data_key;
96 /* The "aclass" indices for various kinds of computed DWARF symbols. */
98 static int dwarf2_locexpr_index;
99 static int dwarf2_loclist_index;
100 static int dwarf2_locexpr_block_index;
101 static int dwarf2_loclist_block_index;
103 struct dwarf2_section_info
106 const gdb_byte *buffer;
108 /* True if we have tried to read this section. */
112 typedef struct dwarf2_section_info dwarf2_section_info_def;
113 DEF_VEC_O (dwarf2_section_info_def);
115 /* All offsets in the index are of this type. It must be
116 architecture-independent. */
117 typedef uint32_t offset_type;
119 DEF_VEC_I (offset_type);
121 /* Ensure only legit values are used. */
122 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
124 gdb_assert ((unsigned int) (value) <= 1); \
125 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
128 /* Ensure only legit values are used. */
129 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
131 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
132 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
133 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
136 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
137 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
139 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
140 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
143 /* A description of the mapped index. The file format is described in
144 a comment by the code that writes the index. */
147 /* Index data format version. */
150 /* The total length of the buffer. */
153 /* A pointer to the address table data. */
154 const gdb_byte *address_table;
156 /* Size of the address table data in bytes. */
157 offset_type address_table_size;
159 /* The symbol table, implemented as a hash table. */
160 const offset_type *symbol_table;
162 /* Size in slots, each slot is 2 offset_types. */
163 offset_type symbol_table_slots;
165 /* A pointer to the constant pool. */
166 const char *constant_pool;
169 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
170 DEF_VEC_P (dwarf2_per_cu_ptr);
172 /* Collection of data recorded per objfile.
173 This hangs off of dwarf2_objfile_data_key. */
175 struct dwarf2_per_objfile
177 struct dwarf2_section_info info;
178 struct dwarf2_section_info abbrev;
179 struct dwarf2_section_info line;
180 struct dwarf2_section_info loc;
181 struct dwarf2_section_info macinfo;
182 struct dwarf2_section_info macro;
183 struct dwarf2_section_info str;
184 struct dwarf2_section_info ranges;
185 struct dwarf2_section_info addr;
186 struct dwarf2_section_info frame;
187 struct dwarf2_section_info eh_frame;
188 struct dwarf2_section_info gdb_index;
190 VEC (dwarf2_section_info_def) *types;
193 struct objfile *objfile;
195 /* Table of all the compilation units. This is used to locate
196 the target compilation unit of a particular reference. */
197 struct dwarf2_per_cu_data **all_comp_units;
199 /* The number of compilation units in ALL_COMP_UNITS. */
202 /* The number of .debug_types-related CUs. */
205 /* The .debug_types-related CUs (TUs).
206 This is stored in malloc space because we may realloc it. */
207 struct signatured_type **all_type_units;
209 /* The number of entries in all_type_unit_groups. */
210 int n_type_unit_groups;
212 /* Table of type unit groups.
213 This exists to make it easy to iterate over all CUs and TU groups. */
214 struct type_unit_group **all_type_unit_groups;
216 /* Table of struct type_unit_group objects.
217 The hash key is the DW_AT_stmt_list value. */
218 htab_t type_unit_groups;
220 /* A table mapping .debug_types signatures to its signatured_type entry.
221 This is NULL if the .debug_types section hasn't been read in yet. */
222 htab_t signatured_types;
224 /* Type unit statistics, to see how well the scaling improvements
228 int nr_uniq_abbrev_tables;
230 int nr_symtab_sharers;
231 int nr_stmt_less_type_units;
234 /* A chain of compilation units that are currently read in, so that
235 they can be freed later. */
236 struct dwarf2_per_cu_data *read_in_chain;
238 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
239 This is NULL if the table hasn't been allocated yet. */
242 /* Non-zero if we've check for whether there is a DWP file. */
245 /* The DWP file if there is one, or NULL. */
246 struct dwp_file *dwp_file;
248 /* The shared '.dwz' file, if one exists. This is used when the
249 original data was compressed using 'dwz -m'. */
250 struct dwz_file *dwz_file;
252 /* A flag indicating wether this objfile has a section loaded at a
254 int has_section_at_zero;
256 /* True if we are using the mapped index,
257 or we are faking it for OBJF_READNOW's sake. */
258 unsigned char using_index;
260 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
261 struct mapped_index *index_table;
263 /* When using index_table, this keeps track of all quick_file_names entries.
264 TUs typically share line table entries with a CU, so we maintain a
265 separate table of all line table entries to support the sharing.
266 Note that while there can be way more TUs than CUs, we've already
267 sorted all the TUs into "type unit groups", grouped by their
268 DW_AT_stmt_list value. Therefore the only sharing done here is with a
269 CU and its associated TU group if there is one. */
270 htab_t quick_file_names_table;
272 /* Set during partial symbol reading, to prevent queueing of full
274 int reading_partial_symbols;
276 /* Table mapping type DIEs to their struct type *.
277 This is NULL if not allocated yet.
278 The mapping is done via (CU/TU + DIE offset) -> type. */
279 htab_t die_type_hash;
281 /* The CUs we recently read. */
282 VEC (dwarf2_per_cu_ptr) *just_read_cus;
285 static struct dwarf2_per_objfile *dwarf2_per_objfile;
287 /* Default names of the debugging sections. */
289 /* Note that if the debugging section has been compressed, it might
290 have a name like .zdebug_info. */
292 static const struct dwarf2_debug_sections dwarf2_elf_names =
294 { ".debug_info", ".zdebug_info" },
295 { ".debug_abbrev", ".zdebug_abbrev" },
296 { ".debug_line", ".zdebug_line" },
297 { ".debug_loc", ".zdebug_loc" },
298 { ".debug_macinfo", ".zdebug_macinfo" },
299 { ".debug_macro", ".zdebug_macro" },
300 { ".debug_str", ".zdebug_str" },
301 { ".debug_ranges", ".zdebug_ranges" },
302 { ".debug_types", ".zdebug_types" },
303 { ".debug_addr", ".zdebug_addr" },
304 { ".debug_frame", ".zdebug_frame" },
305 { ".eh_frame", NULL },
306 { ".gdb_index", ".zgdb_index" },
310 /* List of DWO/DWP sections. */
312 static const struct dwop_section_names
314 struct dwarf2_section_names abbrev_dwo;
315 struct dwarf2_section_names info_dwo;
316 struct dwarf2_section_names line_dwo;
317 struct dwarf2_section_names loc_dwo;
318 struct dwarf2_section_names macinfo_dwo;
319 struct dwarf2_section_names macro_dwo;
320 struct dwarf2_section_names str_dwo;
321 struct dwarf2_section_names str_offsets_dwo;
322 struct dwarf2_section_names types_dwo;
323 struct dwarf2_section_names cu_index;
324 struct dwarf2_section_names tu_index;
328 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
329 { ".debug_info.dwo", ".zdebug_info.dwo" },
330 { ".debug_line.dwo", ".zdebug_line.dwo" },
331 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
332 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
333 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
334 { ".debug_str.dwo", ".zdebug_str.dwo" },
335 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
336 { ".debug_types.dwo", ".zdebug_types.dwo" },
337 { ".debug_cu_index", ".zdebug_cu_index" },
338 { ".debug_tu_index", ".zdebug_tu_index" },
341 /* local data types */
343 /* The data in a compilation unit header, after target2host
344 translation, looks like this. */
345 struct comp_unit_head
349 unsigned char addr_size;
350 unsigned char signed_addr_p;
351 sect_offset abbrev_offset;
353 /* Size of file offsets; either 4 or 8. */
354 unsigned int offset_size;
356 /* Size of the length field; either 4 or 12. */
357 unsigned int initial_length_size;
359 /* Offset to the first byte of this compilation unit header in the
360 .debug_info section, for resolving relative reference dies. */
363 /* Offset to first die in this cu from the start of the cu.
364 This will be the first byte following the compilation unit header. */
365 cu_offset first_die_offset;
368 /* Type used for delaying computation of method physnames.
369 See comments for compute_delayed_physnames. */
370 struct delayed_method_info
372 /* The type to which the method is attached, i.e., its parent class. */
375 /* The index of the method in the type's function fieldlists. */
378 /* The index of the method in the fieldlist. */
381 /* The name of the DIE. */
384 /* The DIE associated with this method. */
385 struct die_info *die;
388 typedef struct delayed_method_info delayed_method_info;
389 DEF_VEC_O (delayed_method_info);
391 /* Internal state when decoding a particular compilation unit. */
394 /* The objfile containing this compilation unit. */
395 struct objfile *objfile;
397 /* The header of the compilation unit. */
398 struct comp_unit_head header;
400 /* Base address of this compilation unit. */
401 CORE_ADDR base_address;
403 /* Non-zero if base_address has been set. */
406 /* The language we are debugging. */
407 enum language language;
408 const struct language_defn *language_defn;
410 const char *producer;
412 /* The generic symbol table building routines have separate lists for
413 file scope symbols and all all other scopes (local scopes). So
414 we need to select the right one to pass to add_symbol_to_list().
415 We do it by keeping a pointer to the correct list in list_in_scope.
417 FIXME: The original dwarf code just treated the file scope as the
418 first local scope, and all other local scopes as nested local
419 scopes, and worked fine. Check to see if we really need to
420 distinguish these in buildsym.c. */
421 struct pending **list_in_scope;
423 /* The abbrev table for this CU.
424 Normally this points to the abbrev table in the objfile.
425 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
426 struct abbrev_table *abbrev_table;
428 /* Hash table holding all the loaded partial DIEs
429 with partial_die->offset.SECT_OFF as hash. */
432 /* Storage for things with the same lifetime as this read-in compilation
433 unit, including partial DIEs. */
434 struct obstack comp_unit_obstack;
436 /* When multiple dwarf2_cu structures are living in memory, this field
437 chains them all together, so that they can be released efficiently.
438 We will probably also want a generation counter so that most-recently-used
439 compilation units are cached... */
440 struct dwarf2_per_cu_data *read_in_chain;
442 /* Backchain to our per_cu entry if the tree has been built. */
443 struct dwarf2_per_cu_data *per_cu;
445 /* How many compilation units ago was this CU last referenced? */
448 /* A hash table of DIE cu_offset for following references with
449 die_info->offset.sect_off as hash. */
452 /* Full DIEs if read in. */
453 struct die_info *dies;
455 /* A set of pointers to dwarf2_per_cu_data objects for compilation
456 units referenced by this one. Only set during full symbol processing;
457 partial symbol tables do not have dependencies. */
460 /* Header data from the line table, during full symbol processing. */
461 struct line_header *line_header;
463 /* A list of methods which need to have physnames computed
464 after all type information has been read. */
465 VEC (delayed_method_info) *method_list;
467 /* To be copied to symtab->call_site_htab. */
468 htab_t call_site_htab;
470 /* Non-NULL if this CU came from a DWO file.
471 There is an invariant here that is important to remember:
472 Except for attributes copied from the top level DIE in the "main"
473 (or "stub") file in preparation for reading the DWO file
474 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
475 Either there isn't a DWO file (in which case this is NULL and the point
476 is moot), or there is and either we're not going to read it (in which
477 case this is NULL) or there is and we are reading it (in which case this
479 struct dwo_unit *dwo_unit;
481 /* The DW_AT_addr_base attribute if present, zero otherwise
482 (zero is a valid value though).
483 Note this value comes from the stub CU/TU's DIE. */
486 /* The DW_AT_ranges_base attribute if present, zero otherwise
487 (zero is a valid value though).
488 Note this value comes from the stub CU/TU's DIE.
489 Also note that the value is zero in the non-DWO case so this value can
490 be used without needing to know whether DWO files are in use or not.
491 N.B. This does not apply to DW_AT_ranges appearing in
492 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
493 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
494 DW_AT_ranges_base *would* have to be applied, and we'd have to care
495 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
496 ULONGEST ranges_base;
498 /* Mark used when releasing cached dies. */
499 unsigned int mark : 1;
501 /* This CU references .debug_loc. See the symtab->locations_valid field.
502 This test is imperfect as there may exist optimized debug code not using
503 any location list and still facing inlining issues if handled as
504 unoptimized code. For a future better test see GCC PR other/32998. */
505 unsigned int has_loclist : 1;
507 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
508 if all the producer_is_* fields are valid. This information is cached
509 because profiling CU expansion showed excessive time spent in
510 producer_is_gxx_lt_4_6. */
511 unsigned int checked_producer : 1;
512 unsigned int producer_is_gxx_lt_4_6 : 1;
513 unsigned int producer_is_gcc_lt_4_3 : 1;
514 unsigned int producer_is_icc : 1;
516 /* When set, the file that we're processing is known to have
517 debugging info for C++ namespaces. GCC 3.3.x did not produce
518 this information, but later versions do. */
520 unsigned int processing_has_namespace_info : 1;
523 /* Persistent data held for a compilation unit, even when not
524 processing it. We put a pointer to this structure in the
525 read_symtab_private field of the psymtab. */
527 struct dwarf2_per_cu_data
529 /* The start offset and length of this compilation unit.
530 NOTE: Unlike comp_unit_head.length, this length includes
532 If the DIE refers to a DWO file, this is always of the original die,
537 /* Flag indicating this compilation unit will be read in before
538 any of the current compilation units are processed. */
539 unsigned int queued : 1;
541 /* This flag will be set when reading partial DIEs if we need to load
542 absolutely all DIEs for this compilation unit, instead of just the ones
543 we think are interesting. It gets set if we look for a DIE in the
544 hash table and don't find it. */
545 unsigned int load_all_dies : 1;
547 /* Non-zero if this CU is from .debug_types.
548 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
550 unsigned int is_debug_types : 1;
552 /* Non-zero if this CU is from the .dwz file. */
553 unsigned int is_dwz : 1;
555 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
556 This flag is only valid if is_debug_types is true.
557 We can't read a CU directly from a DWO file: There are required
558 attributes in the stub. */
559 unsigned int reading_dwo_directly : 1;
561 /* The section this CU/TU lives in.
562 If the DIE refers to a DWO file, this is always the original die,
564 struct dwarf2_section_info *section;
566 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
567 of the CU cache it gets reset to NULL again. */
568 struct dwarf2_cu *cu;
570 /* The corresponding objfile.
571 Normally we can get the objfile from dwarf2_per_objfile.
572 However we can enter this file with just a "per_cu" handle. */
573 struct objfile *objfile;
575 /* When using partial symbol tables, the 'psymtab' field is active.
576 Otherwise the 'quick' field is active. */
579 /* The partial symbol table associated with this compilation unit,
580 or NULL for unread partial units. */
581 struct partial_symtab *psymtab;
583 /* Data needed by the "quick" functions. */
584 struct dwarf2_per_cu_quick_data *quick;
587 /* The CUs we import using DW_TAG_imported_unit. This is filled in
588 while reading psymtabs, used to compute the psymtab dependencies,
589 and then cleared. Then it is filled in again while reading full
590 symbols, and only deleted when the objfile is destroyed.
592 This is also used to work around a difference between the way gold
593 generates .gdb_index version <=7 and the way gdb does. Arguably this
594 is a gold bug. For symbols coming from TUs, gold records in the index
595 the CU that includes the TU instead of the TU itself. This breaks
596 dw2_lookup_symbol: It assumes that if the index says symbol X lives
597 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
598 will find X. Alas TUs live in their own symtab, so after expanding CU Y
599 we need to look in TU Z to find X. Fortunately, this is akin to
600 DW_TAG_imported_unit, so we just use the same mechanism: For
601 .gdb_index version <=7 this also records the TUs that the CU referred
602 to. Concurrently with this change gdb was modified to emit version 8
603 indices so we only pay a price for gold generated indices. */
604 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
607 /* Entry in the signatured_types hash table. */
609 struct signatured_type
611 /* The "per_cu" object of this type.
612 This struct is used iff per_cu.is_debug_types.
613 N.B.: This is the first member so that it's easy to convert pointers
615 struct dwarf2_per_cu_data per_cu;
617 /* The type's signature. */
620 /* Offset in the TU of the type's DIE, as read from the TU header.
621 If this TU is a DWO stub and the definition lives in a DWO file
622 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
623 cu_offset type_offset_in_tu;
625 /* Offset in the section of the type's DIE.
626 If the definition lives in a DWO file, this is the offset in the
627 .debug_types.dwo section.
628 The value is zero until the actual value is known.
629 Zero is otherwise not a valid section offset. */
630 sect_offset type_offset_in_section;
632 /* Type units are grouped by their DW_AT_stmt_list entry so that they
633 can share them. This points to the containing symtab. */
634 struct type_unit_group *type_unit_group;
637 The first time we encounter this type we fully read it in and install it
638 in the symbol tables. Subsequent times we only need the type. */
641 /* Containing DWO unit.
642 This field is valid iff per_cu.reading_dwo_directly. */
643 struct dwo_unit *dwo_unit;
646 typedef struct signatured_type *sig_type_ptr;
647 DEF_VEC_P (sig_type_ptr);
649 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
650 This includes type_unit_group and quick_file_names. */
652 struct stmt_list_hash
654 /* The DWO unit this table is from or NULL if there is none. */
655 struct dwo_unit *dwo_unit;
657 /* Offset in .debug_line or .debug_line.dwo. */
658 sect_offset line_offset;
661 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
662 an object of this type. */
664 struct type_unit_group
666 /* dwarf2read.c's main "handle" on a TU symtab.
667 To simplify things we create an artificial CU that "includes" all the
668 type units using this stmt_list so that the rest of the code still has
669 a "per_cu" handle on the symtab.
670 This PER_CU is recognized by having no section. */
671 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
672 struct dwarf2_per_cu_data per_cu;
674 /* The TUs that share this DW_AT_stmt_list entry.
675 This is added to while parsing type units to build partial symtabs,
676 and is deleted afterwards and not used again. */
677 VEC (sig_type_ptr) *tus;
679 /* The primary symtab.
680 Type units in a group needn't all be defined in the same source file,
681 so we create an essentially anonymous symtab as the primary symtab. */
682 struct symtab *primary_symtab;
684 /* The data used to construct the hash key. */
685 struct stmt_list_hash hash;
687 /* The number of symtabs from the line header.
688 The value here must match line_header.num_file_names. */
689 unsigned int num_symtabs;
691 /* The symbol tables for this TU (obtained from the files listed in
693 WARNING: The order of entries here must match the order of entries
694 in the line header. After the first TU using this type_unit_group, the
695 line header for the subsequent TUs is recreated from this. This is done
696 because we need to use the same symtabs for each TU using the same
697 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
698 there's no guarantee the line header doesn't have duplicate entries. */
699 struct symtab **symtabs;
702 /* These sections are what may appear in a DWO file. */
706 struct dwarf2_section_info abbrev;
707 struct dwarf2_section_info line;
708 struct dwarf2_section_info loc;
709 struct dwarf2_section_info macinfo;
710 struct dwarf2_section_info macro;
711 struct dwarf2_section_info str;
712 struct dwarf2_section_info str_offsets;
713 /* In the case of a virtual DWO file, these two are unused. */
714 struct dwarf2_section_info info;
715 VEC (dwarf2_section_info_def) *types;
718 /* CUs/TUs in DWP/DWO files. */
722 /* Backlink to the containing struct dwo_file. */
723 struct dwo_file *dwo_file;
725 /* The "id" that distinguishes this CU/TU.
726 .debug_info calls this "dwo_id", .debug_types calls this "signature".
727 Since signatures came first, we stick with it for consistency. */
730 /* The section this CU/TU lives in, in the DWO file. */
731 struct dwarf2_section_info *section;
733 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
737 /* For types, offset in the type's DIE of the type defined by this TU. */
738 cu_offset type_offset_in_tu;
741 /* Data for one DWO file.
742 This includes virtual DWO files that have been packaged into a
747 /* The DW_AT_GNU_dwo_name attribute.
748 For virtual DWO files the name is constructed from the section offsets
749 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
750 from related CU+TUs. */
751 const char *dwo_name;
753 /* The DW_AT_comp_dir attribute. */
754 const char *comp_dir;
756 /* The bfd, when the file is open. Otherwise this is NULL.
757 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
760 /* Section info for this file. */
761 struct dwo_sections sections;
763 /* The CU in the file.
764 We only support one because having more than one requires hacking the
765 dwo_name of each to match, which is highly unlikely to happen.
766 Doing this means all TUs can share comp_dir: We also assume that
767 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
770 /* Table of TUs in the file.
771 Each element is a struct dwo_unit. */
775 /* These sections are what may appear in a DWP file. */
779 struct dwarf2_section_info str;
780 struct dwarf2_section_info cu_index;
781 struct dwarf2_section_info tu_index;
782 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
783 by section number. We don't need to record them here. */
786 /* These sections are what may appear in a virtual DWO file. */
788 struct virtual_dwo_sections
790 struct dwarf2_section_info abbrev;
791 struct dwarf2_section_info line;
792 struct dwarf2_section_info loc;
793 struct dwarf2_section_info macinfo;
794 struct dwarf2_section_info macro;
795 struct dwarf2_section_info str_offsets;
796 /* Each DWP hash table entry records one CU or one TU.
797 That is recorded here, and copied to dwo_unit.section. */
798 struct dwarf2_section_info info_or_types;
801 /* Contents of DWP hash tables. */
803 struct dwp_hash_table
805 uint32_t nr_units, nr_slots;
806 const gdb_byte *hash_table, *unit_table, *section_pool;
809 /* Data for one DWP file. */
813 /* Name of the file. */
819 /* Section info for this file. */
820 struct dwp_sections sections;
822 /* Table of CUs in the file. */
823 const struct dwp_hash_table *cus;
825 /* Table of TUs in the file. */
826 const struct dwp_hash_table *tus;
828 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
831 /* Table to map ELF section numbers to their sections. */
832 unsigned int num_sections;
833 asection **elf_sections;
836 /* This represents a '.dwz' file. */
840 /* A dwz file can only contain a few sections. */
841 struct dwarf2_section_info abbrev;
842 struct dwarf2_section_info info;
843 struct dwarf2_section_info str;
844 struct dwarf2_section_info line;
845 struct dwarf2_section_info macro;
846 struct dwarf2_section_info gdb_index;
852 /* Struct used to pass misc. parameters to read_die_and_children, et
853 al. which are used for both .debug_info and .debug_types dies.
854 All parameters here are unchanging for the life of the call. This
855 struct exists to abstract away the constant parameters of die reading. */
857 struct die_reader_specs
859 /* die_section->asection->owner. */
862 /* The CU of the DIE we are parsing. */
863 struct dwarf2_cu *cu;
865 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
866 struct dwo_file *dwo_file;
868 /* The section the die comes from.
869 This is either .debug_info or .debug_types, or the .dwo variants. */
870 struct dwarf2_section_info *die_section;
872 /* die_section->buffer. */
873 const gdb_byte *buffer;
875 /* The end of the buffer. */
876 const gdb_byte *buffer_end;
878 /* The value of the DW_AT_comp_dir attribute. */
879 const char *comp_dir;
882 /* Type of function passed to init_cutu_and_read_dies, et.al. */
883 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
884 const gdb_byte *info_ptr,
885 struct die_info *comp_unit_die,
889 /* The line number information for a compilation unit (found in the
890 .debug_line section) begins with a "statement program header",
891 which contains the following information. */
894 unsigned int total_length;
895 unsigned short version;
896 unsigned int header_length;
897 unsigned char minimum_instruction_length;
898 unsigned char maximum_ops_per_instruction;
899 unsigned char default_is_stmt;
901 unsigned char line_range;
902 unsigned char opcode_base;
904 /* standard_opcode_lengths[i] is the number of operands for the
905 standard opcode whose value is i. This means that
906 standard_opcode_lengths[0] is unused, and the last meaningful
907 element is standard_opcode_lengths[opcode_base - 1]. */
908 unsigned char *standard_opcode_lengths;
910 /* The include_directories table. NOTE! These strings are not
911 allocated with xmalloc; instead, they are pointers into
912 debug_line_buffer. If you try to free them, `free' will get
914 unsigned int num_include_dirs, include_dirs_size;
915 const char **include_dirs;
917 /* The file_names table. NOTE! These strings are not allocated
918 with xmalloc; instead, they are pointers into debug_line_buffer.
919 Don't try to free them directly. */
920 unsigned int num_file_names, file_names_size;
924 unsigned int dir_index;
925 unsigned int mod_time;
927 int included_p; /* Non-zero if referenced by the Line Number Program. */
928 struct symtab *symtab; /* The associated symbol table, if any. */
931 /* The start and end of the statement program following this
932 header. These point into dwarf2_per_objfile->line_buffer. */
933 const gdb_byte *statement_program_start, *statement_program_end;
936 /* When we construct a partial symbol table entry we only
937 need this much information. */
938 struct partial_die_info
940 /* Offset of this DIE. */
943 /* DWARF-2 tag for this DIE. */
944 ENUM_BITFIELD(dwarf_tag) tag : 16;
946 /* Assorted flags describing the data found in this DIE. */
947 unsigned int has_children : 1;
948 unsigned int is_external : 1;
949 unsigned int is_declaration : 1;
950 unsigned int has_type : 1;
951 unsigned int has_specification : 1;
952 unsigned int has_pc_info : 1;
953 unsigned int may_be_inlined : 1;
955 /* Flag set if the SCOPE field of this structure has been
957 unsigned int scope_set : 1;
959 /* Flag set if the DIE has a byte_size attribute. */
960 unsigned int has_byte_size : 1;
962 /* Flag set if any of the DIE's children are template arguments. */
963 unsigned int has_template_arguments : 1;
965 /* Flag set if fixup_partial_die has been called on this die. */
966 unsigned int fixup_called : 1;
968 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
969 unsigned int is_dwz : 1;
971 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
972 unsigned int spec_is_dwz : 1;
974 /* The name of this DIE. Normally the value of DW_AT_name, but
975 sometimes a default name for unnamed DIEs. */
978 /* The linkage name, if present. */
979 const char *linkage_name;
981 /* The scope to prepend to our children. This is generally
982 allocated on the comp_unit_obstack, so will disappear
983 when this compilation unit leaves the cache. */
986 /* Some data associated with the partial DIE. The tag determines
987 which field is live. */
990 /* The location description associated with this DIE, if any. */
991 struct dwarf_block *locdesc;
992 /* The offset of an import, for DW_TAG_imported_unit. */
996 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1000 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1001 DW_AT_sibling, if any. */
1002 /* NOTE: This member isn't strictly necessary, read_partial_die could
1003 return DW_AT_sibling values to its caller load_partial_dies. */
1004 const gdb_byte *sibling;
1006 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1007 DW_AT_specification (or DW_AT_abstract_origin or
1008 DW_AT_extension). */
1009 sect_offset spec_offset;
1011 /* Pointers to this DIE's parent, first child, and next sibling,
1013 struct partial_die_info *die_parent, *die_child, *die_sibling;
1016 /* This data structure holds the information of an abbrev. */
1019 unsigned int number; /* number identifying abbrev */
1020 enum dwarf_tag tag; /* dwarf tag */
1021 unsigned short has_children; /* boolean */
1022 unsigned short num_attrs; /* number of attributes */
1023 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1024 struct abbrev_info *next; /* next in chain */
1029 ENUM_BITFIELD(dwarf_attribute) name : 16;
1030 ENUM_BITFIELD(dwarf_form) form : 16;
1033 /* Size of abbrev_table.abbrev_hash_table. */
1034 #define ABBREV_HASH_SIZE 121
1036 /* Top level data structure to contain an abbreviation table. */
1040 /* Where the abbrev table came from.
1041 This is used as a sanity check when the table is used. */
1044 /* Storage for the abbrev table. */
1045 struct obstack abbrev_obstack;
1047 /* Hash table of abbrevs.
1048 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1049 It could be statically allocated, but the previous code didn't so we
1051 struct abbrev_info **abbrevs;
1054 /* Attributes have a name and a value. */
1057 ENUM_BITFIELD(dwarf_attribute) name : 16;
1058 ENUM_BITFIELD(dwarf_form) form : 15;
1060 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1061 field should be in u.str (existing only for DW_STRING) but it is kept
1062 here for better struct attribute alignment. */
1063 unsigned int string_is_canonical : 1;
1068 struct dwarf_block *blk;
1077 /* This data structure holds a complete die structure. */
1080 /* DWARF-2 tag for this DIE. */
1081 ENUM_BITFIELD(dwarf_tag) tag : 16;
1083 /* Number of attributes */
1084 unsigned char num_attrs;
1086 /* True if we're presently building the full type name for the
1087 type derived from this DIE. */
1088 unsigned char building_fullname : 1;
1091 unsigned int abbrev;
1093 /* Offset in .debug_info or .debug_types section. */
1096 /* The dies in a compilation unit form an n-ary tree. PARENT
1097 points to this die's parent; CHILD points to the first child of
1098 this node; and all the children of a given node are chained
1099 together via their SIBLING fields. */
1100 struct die_info *child; /* Its first child, if any. */
1101 struct die_info *sibling; /* Its next sibling, if any. */
1102 struct die_info *parent; /* Its parent, if any. */
1104 /* An array of attributes, with NUM_ATTRS elements. There may be
1105 zero, but it's not common and zero-sized arrays are not
1106 sufficiently portable C. */
1107 struct attribute attrs[1];
1110 /* Get at parts of an attribute structure. */
1112 #define DW_STRING(attr) ((attr)->u.str)
1113 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1114 #define DW_UNSND(attr) ((attr)->u.unsnd)
1115 #define DW_BLOCK(attr) ((attr)->u.blk)
1116 #define DW_SND(attr) ((attr)->u.snd)
1117 #define DW_ADDR(attr) ((attr)->u.addr)
1118 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1120 /* Blocks are a bunch of untyped bytes. */
1125 /* Valid only if SIZE is not zero. */
1126 const gdb_byte *data;
1129 #ifndef ATTR_ALLOC_CHUNK
1130 #define ATTR_ALLOC_CHUNK 4
1133 /* Allocate fields for structs, unions and enums in this size. */
1134 #ifndef DW_FIELD_ALLOC_CHUNK
1135 #define DW_FIELD_ALLOC_CHUNK 4
1138 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1139 but this would require a corresponding change in unpack_field_as_long
1141 static int bits_per_byte = 8;
1143 /* The routines that read and process dies for a C struct or C++ class
1144 pass lists of data member fields and lists of member function fields
1145 in an instance of a field_info structure, as defined below. */
1148 /* List of data member and baseclasses fields. */
1151 struct nextfield *next;
1156 *fields, *baseclasses;
1158 /* Number of fields (including baseclasses). */
1161 /* Number of baseclasses. */
1164 /* Set if the accesibility of one of the fields is not public. */
1165 int non_public_fields;
1167 /* Member function fields array, entries are allocated in the order they
1168 are encountered in the object file. */
1171 struct nextfnfield *next;
1172 struct fn_field fnfield;
1176 /* Member function fieldlist array, contains name of possibly overloaded
1177 member function, number of overloaded member functions and a pointer
1178 to the head of the member function field chain. */
1183 struct nextfnfield *head;
1187 /* Number of entries in the fnfieldlists array. */
1190 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1191 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1192 struct typedef_field_list
1194 struct typedef_field field;
1195 struct typedef_field_list *next;
1197 *typedef_field_list;
1198 unsigned typedef_field_list_count;
1201 /* One item on the queue of compilation units to read in full symbols
1203 struct dwarf2_queue_item
1205 struct dwarf2_per_cu_data *per_cu;
1206 enum language pretend_language;
1207 struct dwarf2_queue_item *next;
1210 /* The current queue. */
1211 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1213 /* Loaded secondary compilation units are kept in memory until they
1214 have not been referenced for the processing of this many
1215 compilation units. Set this to zero to disable caching. Cache
1216 sizes of up to at least twenty will improve startup time for
1217 typical inter-CU-reference binaries, at an obvious memory cost. */
1218 static int dwarf2_max_cache_age = 5;
1220 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1221 struct cmd_list_element *c, const char *value)
1223 fprintf_filtered (file, _("The upper bound on the age of cached "
1224 "dwarf2 compilation units is %s.\n"),
1229 /* Various complaints about symbol reading that don't abort the process. */
1232 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1234 complaint (&symfile_complaints,
1235 _("statement list doesn't fit in .debug_line section"));
1239 dwarf2_debug_line_missing_file_complaint (void)
1241 complaint (&symfile_complaints,
1242 _(".debug_line section has line data without a file"));
1246 dwarf2_debug_line_missing_end_sequence_complaint (void)
1248 complaint (&symfile_complaints,
1249 _(".debug_line section has line "
1250 "program sequence without an end"));
1254 dwarf2_complex_location_expr_complaint (void)
1256 complaint (&symfile_complaints, _("location expression too complex"));
1260 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1263 complaint (&symfile_complaints,
1264 _("const value length mismatch for '%s', got %d, expected %d"),
1269 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1271 complaint (&symfile_complaints,
1272 _("debug info runs off end of %s section"
1274 section->asection->name,
1275 bfd_get_filename (section->asection->owner));
1279 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1281 complaint (&symfile_complaints,
1282 _("macro debug info contains a "
1283 "malformed macro definition:\n`%s'"),
1288 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1290 complaint (&symfile_complaints,
1291 _("invalid attribute class or form for '%s' in '%s'"),
1295 /* local function prototypes */
1297 static void dwarf2_locate_sections (bfd *, asection *, void *);
1299 static void dwarf2_find_base_address (struct die_info *die,
1300 struct dwarf2_cu *cu);
1302 static struct partial_symtab *create_partial_symtab
1303 (struct dwarf2_per_cu_data *per_cu, const char *name);
1305 static void dwarf2_build_psymtabs_hard (struct objfile *);
1307 static void scan_partial_symbols (struct partial_die_info *,
1308 CORE_ADDR *, CORE_ADDR *,
1309 int, struct dwarf2_cu *);
1311 static void add_partial_symbol (struct partial_die_info *,
1312 struct dwarf2_cu *);
1314 static void add_partial_namespace (struct partial_die_info *pdi,
1315 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1316 int need_pc, struct dwarf2_cu *cu);
1318 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1319 CORE_ADDR *highpc, int need_pc,
1320 struct dwarf2_cu *cu);
1322 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1323 struct dwarf2_cu *cu);
1325 static void add_partial_subprogram (struct partial_die_info *pdi,
1326 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1327 int need_pc, struct dwarf2_cu *cu);
1329 static void dwarf2_read_symtab (struct partial_symtab *,
1332 static void psymtab_to_symtab_1 (struct partial_symtab *);
1334 static struct abbrev_info *abbrev_table_lookup_abbrev
1335 (const struct abbrev_table *, unsigned int);
1337 static struct abbrev_table *abbrev_table_read_table
1338 (struct dwarf2_section_info *, sect_offset);
1340 static void abbrev_table_free (struct abbrev_table *);
1342 static void abbrev_table_free_cleanup (void *);
1344 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1345 struct dwarf2_section_info *);
1347 static void dwarf2_free_abbrev_table (void *);
1349 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1351 static struct partial_die_info *load_partial_dies
1352 (const struct die_reader_specs *, const gdb_byte *, int);
1354 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1355 struct partial_die_info *,
1356 struct abbrev_info *,
1360 static struct partial_die_info *find_partial_die (sect_offset, int,
1361 struct dwarf2_cu *);
1363 static void fixup_partial_die (struct partial_die_info *,
1364 struct dwarf2_cu *);
1366 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1367 struct attribute *, struct attr_abbrev *,
1370 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1372 static int read_1_signed_byte (bfd *, const gdb_byte *);
1374 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1376 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1378 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1380 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1383 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1385 static LONGEST read_checked_initial_length_and_offset
1386 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1387 unsigned int *, unsigned int *);
1389 static LONGEST read_offset (bfd *, const gdb_byte *,
1390 const struct comp_unit_head *,
1393 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1395 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1398 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1400 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1402 static const char *read_indirect_string (bfd *, const gdb_byte *,
1403 const struct comp_unit_head *,
1406 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1408 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1410 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1412 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1416 static const char *read_str_index (const struct die_reader_specs *reader,
1417 struct dwarf2_cu *cu, ULONGEST str_index);
1419 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1421 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1422 struct dwarf2_cu *);
1424 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1427 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1428 struct dwarf2_cu *cu);
1430 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1432 static struct die_info *die_specification (struct die_info *die,
1433 struct dwarf2_cu **);
1435 static void free_line_header (struct line_header *lh);
1437 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1438 struct dwarf2_cu *cu);
1440 static void dwarf_decode_lines (struct line_header *, const char *,
1441 struct dwarf2_cu *, struct partial_symtab *,
1444 static void dwarf2_start_subfile (const char *, const char *, const char *);
1446 static void dwarf2_start_symtab (struct dwarf2_cu *,
1447 const char *, const char *, CORE_ADDR);
1449 static struct symbol *new_symbol (struct die_info *, struct type *,
1450 struct dwarf2_cu *);
1452 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1453 struct dwarf2_cu *, struct symbol *);
1455 static void dwarf2_const_value (struct attribute *, struct symbol *,
1456 struct dwarf2_cu *);
1458 static void dwarf2_const_value_attr (struct attribute *attr,
1461 struct obstack *obstack,
1462 struct dwarf2_cu *cu, LONGEST *value,
1463 const gdb_byte **bytes,
1464 struct dwarf2_locexpr_baton **baton);
1466 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1468 static int need_gnat_info (struct dwarf2_cu *);
1470 static struct type *die_descriptive_type (struct die_info *,
1471 struct dwarf2_cu *);
1473 static void set_descriptive_type (struct type *, struct die_info *,
1474 struct dwarf2_cu *);
1476 static struct type *die_containing_type (struct die_info *,
1477 struct dwarf2_cu *);
1479 static struct type *lookup_die_type (struct die_info *, struct attribute *,
1480 struct dwarf2_cu *);
1482 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1484 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1486 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1488 static char *typename_concat (struct obstack *obs, const char *prefix,
1489 const char *suffix, int physname,
1490 struct dwarf2_cu *cu);
1492 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1494 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1496 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1498 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1500 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1502 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1503 struct dwarf2_cu *, struct partial_symtab *);
1505 static int dwarf2_get_pc_bounds (struct die_info *,
1506 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1507 struct partial_symtab *);
1509 static void get_scope_pc_bounds (struct die_info *,
1510 CORE_ADDR *, CORE_ADDR *,
1511 struct dwarf2_cu *);
1513 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1514 CORE_ADDR, struct dwarf2_cu *);
1516 static void dwarf2_add_field (struct field_info *, struct die_info *,
1517 struct dwarf2_cu *);
1519 static void dwarf2_attach_fields_to_type (struct field_info *,
1520 struct type *, struct dwarf2_cu *);
1522 static void dwarf2_add_member_fn (struct field_info *,
1523 struct die_info *, struct type *,
1524 struct dwarf2_cu *);
1526 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1528 struct dwarf2_cu *);
1530 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1532 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1534 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1536 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1538 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1540 static struct type *read_module_type (struct die_info *die,
1541 struct dwarf2_cu *cu);
1543 static const char *namespace_name (struct die_info *die,
1544 int *is_anonymous, struct dwarf2_cu *);
1546 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1548 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1550 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1551 struct dwarf2_cu *);
1553 static struct die_info *read_die_and_siblings_1
1554 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1557 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1558 const gdb_byte *info_ptr,
1559 const gdb_byte **new_info_ptr,
1560 struct die_info *parent);
1562 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1563 struct die_info **, const gdb_byte *,
1566 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1567 struct die_info **, const gdb_byte *,
1570 static void process_die (struct die_info *, struct dwarf2_cu *);
1572 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1575 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1577 static const char *dwarf2_full_name (const char *name,
1578 struct die_info *die,
1579 struct dwarf2_cu *cu);
1581 static const char *dwarf2_physname (const char *name, struct die_info *die,
1582 struct dwarf2_cu *cu);
1584 static struct die_info *dwarf2_extension (struct die_info *die,
1585 struct dwarf2_cu **);
1587 static const char *dwarf_tag_name (unsigned int);
1589 static const char *dwarf_attr_name (unsigned int);
1591 static const char *dwarf_form_name (unsigned int);
1593 static char *dwarf_bool_name (unsigned int);
1595 static const char *dwarf_type_encoding_name (unsigned int);
1597 static struct die_info *sibling_die (struct die_info *);
1599 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1601 static void dump_die_for_error (struct die_info *);
1603 static void dump_die_1 (struct ui_file *, int level, int max_level,
1606 /*static*/ void dump_die (struct die_info *, int max_level);
1608 static void store_in_ref_table (struct die_info *,
1609 struct dwarf2_cu *);
1611 static int is_ref_attr (struct attribute *);
1613 static sect_offset dwarf2_get_ref_die_offset (struct attribute *);
1615 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int);
1617 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1619 struct dwarf2_cu **);
1621 static struct die_info *follow_die_ref (struct die_info *,
1623 struct dwarf2_cu **);
1625 static struct die_info *follow_die_sig (struct die_info *,
1627 struct dwarf2_cu **);
1629 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1630 struct dwarf2_cu *);
1632 static struct type *get_DW_AT_signature_type (struct die_info *,
1634 struct dwarf2_cu *);
1636 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1638 static void read_signatured_type (struct signatured_type *);
1640 static struct type_unit_group *get_type_unit_group
1641 (struct dwarf2_cu *, struct attribute *);
1643 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1645 /* memory allocation interface */
1647 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1649 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1651 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1654 static int attr_form_is_block (struct attribute *);
1656 static int attr_form_is_section_offset (struct attribute *);
1658 static int attr_form_is_constant (struct attribute *);
1660 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1661 struct dwarf2_loclist_baton *baton,
1662 struct attribute *attr);
1664 static void dwarf2_symbol_mark_computed (struct attribute *attr,
1666 struct dwarf2_cu *cu,
1669 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1670 const gdb_byte *info_ptr,
1671 struct abbrev_info *abbrev);
1673 static void free_stack_comp_unit (void *);
1675 static hashval_t partial_die_hash (const void *item);
1677 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1679 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1680 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1682 static void init_one_comp_unit (struct dwarf2_cu *cu,
1683 struct dwarf2_per_cu_data *per_cu);
1685 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1686 struct die_info *comp_unit_die,
1687 enum language pretend_language);
1689 static void free_heap_comp_unit (void *);
1691 static void free_cached_comp_units (void *);
1693 static void age_cached_comp_units (void);
1695 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1697 static struct type *set_die_type (struct die_info *, struct type *,
1698 struct dwarf2_cu *);
1700 static void create_all_comp_units (struct objfile *);
1702 static int create_all_type_units (struct objfile *);
1704 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1707 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1710 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1713 static void dwarf2_add_dependence (struct dwarf2_cu *,
1714 struct dwarf2_per_cu_data *);
1716 static void dwarf2_mark (struct dwarf2_cu *);
1718 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1720 static struct type *get_die_type_at_offset (sect_offset,
1721 struct dwarf2_per_cu_data *);
1723 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1725 static void dwarf2_release_queue (void *dummy);
1727 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1728 enum language pretend_language);
1730 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
1731 struct dwarf2_per_cu_data *per_cu,
1732 enum language pretend_language);
1734 static void process_queue (void);
1736 static void find_file_and_directory (struct die_info *die,
1737 struct dwarf2_cu *cu,
1738 const char **name, const char **comp_dir);
1740 static char *file_full_name (int file, struct line_header *lh,
1741 const char *comp_dir);
1743 static const gdb_byte *read_and_check_comp_unit_head
1744 (struct comp_unit_head *header,
1745 struct dwarf2_section_info *section,
1746 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1747 int is_debug_types_section);
1749 static void init_cutu_and_read_dies
1750 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1751 int use_existing_cu, int keep,
1752 die_reader_func_ftype *die_reader_func, void *data);
1754 static void init_cutu_and_read_dies_simple
1755 (struct dwarf2_per_cu_data *this_cu,
1756 die_reader_func_ftype *die_reader_func, void *data);
1758 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1760 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1762 static struct dwo_unit *lookup_dwo_in_dwp
1763 (struct dwp_file *dwp_file, const struct dwp_hash_table *htab,
1764 const char *comp_dir, ULONGEST signature, int is_debug_types);
1766 static struct dwp_file *get_dwp_file (void);
1768 static struct dwo_unit *lookup_dwo_comp_unit
1769 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1771 static struct dwo_unit *lookup_dwo_type_unit
1772 (struct signatured_type *, const char *, const char *);
1774 static void free_dwo_file_cleanup (void *);
1776 static void process_cu_includes (void);
1778 static void check_producer (struct dwarf2_cu *cu);
1782 /* Convert VALUE between big- and little-endian. */
1784 byte_swap (offset_type value)
1788 result = (value & 0xff) << 24;
1789 result |= (value & 0xff00) << 8;
1790 result |= (value & 0xff0000) >> 8;
1791 result |= (value & 0xff000000) >> 24;
1795 #define MAYBE_SWAP(V) byte_swap (V)
1798 #define MAYBE_SWAP(V) (V)
1799 #endif /* WORDS_BIGENDIAN */
1801 /* The suffix for an index file. */
1802 #define INDEX_SUFFIX ".gdb-index"
1804 /* Try to locate the sections we need for DWARF 2 debugging
1805 information and return true if we have enough to do something.
1806 NAMES points to the dwarf2 section names, or is NULL if the standard
1807 ELF names are used. */
1810 dwarf2_has_info (struct objfile *objfile,
1811 const struct dwarf2_debug_sections *names)
1813 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1814 if (!dwarf2_per_objfile)
1816 /* Initialize per-objfile state. */
1817 struct dwarf2_per_objfile *data
1818 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1820 memset (data, 0, sizeof (*data));
1821 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1822 dwarf2_per_objfile = data;
1824 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1826 dwarf2_per_objfile->objfile = objfile;
1828 return (dwarf2_per_objfile->info.asection != NULL
1829 && dwarf2_per_objfile->abbrev.asection != NULL);
1832 /* When loading sections, we look either for uncompressed section or for
1833 compressed section names. */
1836 section_is_p (const char *section_name,
1837 const struct dwarf2_section_names *names)
1839 if (names->normal != NULL
1840 && strcmp (section_name, names->normal) == 0)
1842 if (names->compressed != NULL
1843 && strcmp (section_name, names->compressed) == 0)
1848 /* This function is mapped across the sections and remembers the
1849 offset and size of each of the debugging sections we are interested
1853 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1855 const struct dwarf2_debug_sections *names;
1856 flagword aflag = bfd_get_section_flags (abfd, sectp);
1859 names = &dwarf2_elf_names;
1861 names = (const struct dwarf2_debug_sections *) vnames;
1863 if ((aflag & SEC_HAS_CONTENTS) == 0)
1866 else if (section_is_p (sectp->name, &names->info))
1868 dwarf2_per_objfile->info.asection = sectp;
1869 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1871 else if (section_is_p (sectp->name, &names->abbrev))
1873 dwarf2_per_objfile->abbrev.asection = sectp;
1874 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1876 else if (section_is_p (sectp->name, &names->line))
1878 dwarf2_per_objfile->line.asection = sectp;
1879 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1881 else if (section_is_p (sectp->name, &names->loc))
1883 dwarf2_per_objfile->loc.asection = sectp;
1884 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1886 else if (section_is_p (sectp->name, &names->macinfo))
1888 dwarf2_per_objfile->macinfo.asection = sectp;
1889 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1891 else if (section_is_p (sectp->name, &names->macro))
1893 dwarf2_per_objfile->macro.asection = sectp;
1894 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1896 else if (section_is_p (sectp->name, &names->str))
1898 dwarf2_per_objfile->str.asection = sectp;
1899 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1901 else if (section_is_p (sectp->name, &names->addr))
1903 dwarf2_per_objfile->addr.asection = sectp;
1904 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1906 else if (section_is_p (sectp->name, &names->frame))
1908 dwarf2_per_objfile->frame.asection = sectp;
1909 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1911 else if (section_is_p (sectp->name, &names->eh_frame))
1913 dwarf2_per_objfile->eh_frame.asection = sectp;
1914 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1916 else if (section_is_p (sectp->name, &names->ranges))
1918 dwarf2_per_objfile->ranges.asection = sectp;
1919 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1921 else if (section_is_p (sectp->name, &names->types))
1923 struct dwarf2_section_info type_section;
1925 memset (&type_section, 0, sizeof (type_section));
1926 type_section.asection = sectp;
1927 type_section.size = bfd_get_section_size (sectp);
1929 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1932 else if (section_is_p (sectp->name, &names->gdb_index))
1934 dwarf2_per_objfile->gdb_index.asection = sectp;
1935 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1938 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1939 && bfd_section_vma (abfd, sectp) == 0)
1940 dwarf2_per_objfile->has_section_at_zero = 1;
1943 /* A helper function that decides whether a section is empty,
1947 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1949 return info->asection == NULL || info->size == 0;
1952 /* Read the contents of the section INFO.
1953 OBJFILE is the main object file, but not necessarily the file where
1954 the section comes from. E.g., for DWO files INFO->asection->owner
1955 is the bfd of the DWO file.
1956 If the section is compressed, uncompress it before returning. */
1959 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1961 asection *sectp = info->asection;
1963 gdb_byte *buf, *retbuf;
1964 unsigned char header[4];
1968 info->buffer = NULL;
1971 if (dwarf2_section_empty_p (info))
1974 abfd = sectp->owner;
1976 /* If the section has relocations, we must read it ourselves.
1977 Otherwise we attach it to the BFD. */
1978 if ((sectp->flags & SEC_RELOC) == 0)
1980 info->buffer = gdb_bfd_map_section (sectp, &info->size);
1984 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1987 /* When debugging .o files, we may need to apply relocations; see
1988 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1989 We never compress sections in .o files, so we only need to
1990 try this when the section is not compressed. */
1991 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
1994 info->buffer = retbuf;
1998 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
1999 || bfd_bread (buf, info->size, abfd) != info->size)
2000 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
2001 bfd_get_filename (abfd));
2004 /* A helper function that returns the size of a section in a safe way.
2005 If you are positive that the section has been read before using the
2006 size, then it is safe to refer to the dwarf2_section_info object's
2007 "size" field directly. In other cases, you must call this
2008 function, because for compressed sections the size field is not set
2009 correctly until the section has been read. */
2011 static bfd_size_type
2012 dwarf2_section_size (struct objfile *objfile,
2013 struct dwarf2_section_info *info)
2016 dwarf2_read_section (objfile, info);
2020 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2024 dwarf2_get_section_info (struct objfile *objfile,
2025 enum dwarf2_section_enum sect,
2026 asection **sectp, const gdb_byte **bufp,
2027 bfd_size_type *sizep)
2029 struct dwarf2_per_objfile *data
2030 = objfile_data (objfile, dwarf2_objfile_data_key);
2031 struct dwarf2_section_info *info;
2033 /* We may see an objfile without any DWARF, in which case we just
2044 case DWARF2_DEBUG_FRAME:
2045 info = &data->frame;
2047 case DWARF2_EH_FRAME:
2048 info = &data->eh_frame;
2051 gdb_assert_not_reached ("unexpected section");
2054 dwarf2_read_section (objfile, info);
2056 *sectp = info->asection;
2057 *bufp = info->buffer;
2058 *sizep = info->size;
2061 /* A helper function to find the sections for a .dwz file. */
2064 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2066 struct dwz_file *dwz_file = arg;
2068 /* Note that we only support the standard ELF names, because .dwz
2069 is ELF-only (at the time of writing). */
2070 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2072 dwz_file->abbrev.asection = sectp;
2073 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2075 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2077 dwz_file->info.asection = sectp;
2078 dwz_file->info.size = bfd_get_section_size (sectp);
2080 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2082 dwz_file->str.asection = sectp;
2083 dwz_file->str.size = bfd_get_section_size (sectp);
2085 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2087 dwz_file->line.asection = sectp;
2088 dwz_file->line.size = bfd_get_section_size (sectp);
2090 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2092 dwz_file->macro.asection = sectp;
2093 dwz_file->macro.size = bfd_get_section_size (sectp);
2095 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2097 dwz_file->gdb_index.asection = sectp;
2098 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2102 /* Open the separate '.dwz' debug file, if needed. Error if the file
2105 static struct dwz_file *
2106 dwarf2_get_dwz_file (void)
2108 bfd *abfd, *dwz_bfd;
2111 struct cleanup *cleanup;
2112 const char *filename;
2113 struct dwz_file *result;
2115 if (dwarf2_per_objfile->dwz_file != NULL)
2116 return dwarf2_per_objfile->dwz_file;
2118 abfd = dwarf2_per_objfile->objfile->obfd;
2119 section = bfd_get_section_by_name (abfd, ".gnu_debugaltlink");
2120 if (section == NULL)
2121 error (_("could not find '.gnu_debugaltlink' section"));
2122 if (!bfd_malloc_and_get_section (abfd, section, &data))
2123 error (_("could not read '.gnu_debugaltlink' section: %s"),
2124 bfd_errmsg (bfd_get_error ()));
2125 cleanup = make_cleanup (xfree, data);
2127 filename = (const char *) data;
2128 if (!IS_ABSOLUTE_PATH (filename))
2130 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name);
2133 make_cleanup (xfree, abs);
2134 abs = ldirname (abs);
2135 make_cleanup (xfree, abs);
2137 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2138 make_cleanup (xfree, rel);
2142 /* The format is just a NUL-terminated file name, followed by the
2143 build-id. For now, though, we ignore the build-id. */
2144 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2145 if (dwz_bfd == NULL)
2146 error (_("could not read '%s': %s"), filename,
2147 bfd_errmsg (bfd_get_error ()));
2149 if (!bfd_check_format (dwz_bfd, bfd_object))
2151 gdb_bfd_unref (dwz_bfd);
2152 error (_("file '%s' was not usable: %s"), filename,
2153 bfd_errmsg (bfd_get_error ()));
2156 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2158 result->dwz_bfd = dwz_bfd;
2160 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2162 do_cleanups (cleanup);
2164 dwarf2_per_objfile->dwz_file = result;
2168 /* DWARF quick_symbols_functions support. */
2170 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2171 unique line tables, so we maintain a separate table of all .debug_line
2172 derived entries to support the sharing.
2173 All the quick functions need is the list of file names. We discard the
2174 line_header when we're done and don't need to record it here. */
2175 struct quick_file_names
2177 /* The data used to construct the hash key. */
2178 struct stmt_list_hash hash;
2180 /* The number of entries in file_names, real_names. */
2181 unsigned int num_file_names;
2183 /* The file names from the line table, after being run through
2185 const char **file_names;
2187 /* The file names from the line table after being run through
2188 gdb_realpath. These are computed lazily. */
2189 const char **real_names;
2192 /* When using the index (and thus not using psymtabs), each CU has an
2193 object of this type. This is used to hold information needed by
2194 the various "quick" methods. */
2195 struct dwarf2_per_cu_quick_data
2197 /* The file table. This can be NULL if there was no file table
2198 or it's currently not read in.
2199 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2200 struct quick_file_names *file_names;
2202 /* The corresponding symbol table. This is NULL if symbols for this
2203 CU have not yet been read. */
2204 struct symtab *symtab;
2206 /* A temporary mark bit used when iterating over all CUs in
2207 expand_symtabs_matching. */
2208 unsigned int mark : 1;
2210 /* True if we've tried to read the file table and found there isn't one.
2211 There will be no point in trying to read it again next time. */
2212 unsigned int no_file_data : 1;
2215 /* Utility hash function for a stmt_list_hash. */
2218 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2222 if (stmt_list_hash->dwo_unit != NULL)
2223 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2224 v += stmt_list_hash->line_offset.sect_off;
2228 /* Utility equality function for a stmt_list_hash. */
2231 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2232 const struct stmt_list_hash *rhs)
2234 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2236 if (lhs->dwo_unit != NULL
2237 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2240 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2243 /* Hash function for a quick_file_names. */
2246 hash_file_name_entry (const void *e)
2248 const struct quick_file_names *file_data = e;
2250 return hash_stmt_list_entry (&file_data->hash);
2253 /* Equality function for a quick_file_names. */
2256 eq_file_name_entry (const void *a, const void *b)
2258 const struct quick_file_names *ea = a;
2259 const struct quick_file_names *eb = b;
2261 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2264 /* Delete function for a quick_file_names. */
2267 delete_file_name_entry (void *e)
2269 struct quick_file_names *file_data = e;
2272 for (i = 0; i < file_data->num_file_names; ++i)
2274 xfree ((void*) file_data->file_names[i]);
2275 if (file_data->real_names)
2276 xfree ((void*) file_data->real_names[i]);
2279 /* The space for the struct itself lives on objfile_obstack,
2280 so we don't free it here. */
2283 /* Create a quick_file_names hash table. */
2286 create_quick_file_names_table (unsigned int nr_initial_entries)
2288 return htab_create_alloc (nr_initial_entries,
2289 hash_file_name_entry, eq_file_name_entry,
2290 delete_file_name_entry, xcalloc, xfree);
2293 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2294 have to be created afterwards. You should call age_cached_comp_units after
2295 processing PER_CU->CU. dw2_setup must have been already called. */
2298 load_cu (struct dwarf2_per_cu_data *per_cu)
2300 if (per_cu->is_debug_types)
2301 load_full_type_unit (per_cu);
2303 load_full_comp_unit (per_cu, language_minimal);
2305 gdb_assert (per_cu->cu != NULL);
2307 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2310 /* Read in the symbols for PER_CU. */
2313 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2315 struct cleanup *back_to;
2317 /* Skip type_unit_groups, reading the type units they contain
2318 is handled elsewhere. */
2319 if (IS_TYPE_UNIT_GROUP (per_cu))
2322 back_to = make_cleanup (dwarf2_release_queue, NULL);
2324 if (dwarf2_per_objfile->using_index
2325 ? per_cu->v.quick->symtab == NULL
2326 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2328 queue_comp_unit (per_cu, language_minimal);
2334 /* Age the cache, releasing compilation units that have not
2335 been used recently. */
2336 age_cached_comp_units ();
2338 do_cleanups (back_to);
2341 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2342 the objfile from which this CU came. Returns the resulting symbol
2345 static struct symtab *
2346 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2348 gdb_assert (dwarf2_per_objfile->using_index);
2349 if (!per_cu->v.quick->symtab)
2351 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2352 increment_reading_symtab ();
2353 dw2_do_instantiate_symtab (per_cu);
2354 process_cu_includes ();
2355 do_cleanups (back_to);
2357 return per_cu->v.quick->symtab;
2360 /* Return the CU given its index.
2362 This is intended for loops like:
2364 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2365 + dwarf2_per_objfile->n_type_units); ++i)
2367 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2373 static struct dwarf2_per_cu_data *
2374 dw2_get_cu (int index)
2376 if (index >= dwarf2_per_objfile->n_comp_units)
2378 index -= dwarf2_per_objfile->n_comp_units;
2379 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2380 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2383 return dwarf2_per_objfile->all_comp_units[index];
2386 /* Return the primary CU given its index.
2387 The difference between this function and dw2_get_cu is in the handling
2388 of type units (TUs). Here we return the type_unit_group object.
2390 This is intended for loops like:
2392 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2393 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2395 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2401 static struct dwarf2_per_cu_data *
2402 dw2_get_primary_cu (int index)
2404 if (index >= dwarf2_per_objfile->n_comp_units)
2406 index -= dwarf2_per_objfile->n_comp_units;
2407 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2408 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2411 return dwarf2_per_objfile->all_comp_units[index];
2414 /* A helper for create_cus_from_index that handles a given list of
2418 create_cus_from_index_list (struct objfile *objfile,
2419 const gdb_byte *cu_list, offset_type n_elements,
2420 struct dwarf2_section_info *section,
2426 for (i = 0; i < n_elements; i += 2)
2428 struct dwarf2_per_cu_data *the_cu;
2429 ULONGEST offset, length;
2431 gdb_static_assert (sizeof (ULONGEST) >= 8);
2432 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2433 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2436 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2437 struct dwarf2_per_cu_data);
2438 the_cu->offset.sect_off = offset;
2439 the_cu->length = length;
2440 the_cu->objfile = objfile;
2441 the_cu->section = section;
2442 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2443 struct dwarf2_per_cu_quick_data);
2444 the_cu->is_dwz = is_dwz;
2445 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2449 /* Read the CU list from the mapped index, and use it to create all
2450 the CU objects for this objfile. */
2453 create_cus_from_index (struct objfile *objfile,
2454 const gdb_byte *cu_list, offset_type cu_list_elements,
2455 const gdb_byte *dwz_list, offset_type dwz_elements)
2457 struct dwz_file *dwz;
2459 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2460 dwarf2_per_objfile->all_comp_units
2461 = obstack_alloc (&objfile->objfile_obstack,
2462 dwarf2_per_objfile->n_comp_units
2463 * sizeof (struct dwarf2_per_cu_data *));
2465 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2466 &dwarf2_per_objfile->info, 0, 0);
2468 if (dwz_elements == 0)
2471 dwz = dwarf2_get_dwz_file ();
2472 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2473 cu_list_elements / 2);
2476 /* Create the signatured type hash table from the index. */
2479 create_signatured_type_table_from_index (struct objfile *objfile,
2480 struct dwarf2_section_info *section,
2481 const gdb_byte *bytes,
2482 offset_type elements)
2485 htab_t sig_types_hash;
2487 dwarf2_per_objfile->n_type_units = elements / 3;
2488 dwarf2_per_objfile->all_type_units
2489 = xmalloc (dwarf2_per_objfile->n_type_units
2490 * sizeof (struct signatured_type *));
2492 sig_types_hash = allocate_signatured_type_table (objfile);
2494 for (i = 0; i < elements; i += 3)
2496 struct signatured_type *sig_type;
2497 ULONGEST offset, type_offset_in_tu, signature;
2500 gdb_static_assert (sizeof (ULONGEST) >= 8);
2501 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2502 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2504 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2507 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2508 struct signatured_type);
2509 sig_type->signature = signature;
2510 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2511 sig_type->per_cu.is_debug_types = 1;
2512 sig_type->per_cu.section = section;
2513 sig_type->per_cu.offset.sect_off = offset;
2514 sig_type->per_cu.objfile = objfile;
2515 sig_type->per_cu.v.quick
2516 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2517 struct dwarf2_per_cu_quick_data);
2519 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2522 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2525 dwarf2_per_objfile->signatured_types = sig_types_hash;
2528 /* Read the address map data from the mapped index, and use it to
2529 populate the objfile's psymtabs_addrmap. */
2532 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2534 const gdb_byte *iter, *end;
2535 struct obstack temp_obstack;
2536 struct addrmap *mutable_map;
2537 struct cleanup *cleanup;
2540 obstack_init (&temp_obstack);
2541 cleanup = make_cleanup_obstack_free (&temp_obstack);
2542 mutable_map = addrmap_create_mutable (&temp_obstack);
2544 iter = index->address_table;
2545 end = iter + index->address_table_size;
2547 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2551 ULONGEST hi, lo, cu_index;
2552 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2554 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2556 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2559 if (cu_index < dwarf2_per_objfile->n_comp_units)
2561 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2562 dw2_get_cu (cu_index));
2566 complaint (&symfile_complaints,
2567 _(".gdb_index address table has invalid CU number %u"),
2568 (unsigned) cu_index);
2572 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2573 &objfile->objfile_obstack);
2574 do_cleanups (cleanup);
2577 /* The hash function for strings in the mapped index. This is the same as
2578 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2579 implementation. This is necessary because the hash function is tied to the
2580 format of the mapped index file. The hash values do not have to match with
2583 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2586 mapped_index_string_hash (int index_version, const void *p)
2588 const unsigned char *str = (const unsigned char *) p;
2592 while ((c = *str++) != 0)
2594 if (index_version >= 5)
2596 r = r * 67 + c - 113;
2602 /* Find a slot in the mapped index INDEX for the object named NAME.
2603 If NAME is found, set *VEC_OUT to point to the CU vector in the
2604 constant pool and return 1. If NAME cannot be found, return 0. */
2607 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2608 offset_type **vec_out)
2610 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2612 offset_type slot, step;
2613 int (*cmp) (const char *, const char *);
2615 if (current_language->la_language == language_cplus
2616 || current_language->la_language == language_java
2617 || current_language->la_language == language_fortran)
2619 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2621 const char *paren = strchr (name, '(');
2627 dup = xmalloc (paren - name + 1);
2628 memcpy (dup, name, paren - name);
2629 dup[paren - name] = 0;
2631 make_cleanup (xfree, dup);
2636 /* Index version 4 did not support case insensitive searches. But the
2637 indices for case insensitive languages are built in lowercase, therefore
2638 simulate our NAME being searched is also lowercased. */
2639 hash = mapped_index_string_hash ((index->version == 4
2640 && case_sensitivity == case_sensitive_off
2641 ? 5 : index->version),
2644 slot = hash & (index->symbol_table_slots - 1);
2645 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2646 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2650 /* Convert a slot number to an offset into the table. */
2651 offset_type i = 2 * slot;
2653 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2655 do_cleanups (back_to);
2659 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2660 if (!cmp (name, str))
2662 *vec_out = (offset_type *) (index->constant_pool
2663 + MAYBE_SWAP (index->symbol_table[i + 1]));
2664 do_cleanups (back_to);
2668 slot = (slot + step) & (index->symbol_table_slots - 1);
2672 /* A helper function that reads the .gdb_index from SECTION and fills
2673 in MAP. FILENAME is the name of the file containing the section;
2674 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2675 ok to use deprecated sections.
2677 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2678 out parameters that are filled in with information about the CU and
2679 TU lists in the section.
2681 Returns 1 if all went well, 0 otherwise. */
2684 read_index_from_section (struct objfile *objfile,
2685 const char *filename,
2687 struct dwarf2_section_info *section,
2688 struct mapped_index *map,
2689 const gdb_byte **cu_list,
2690 offset_type *cu_list_elements,
2691 const gdb_byte **types_list,
2692 offset_type *types_list_elements)
2694 const gdb_byte *addr;
2695 offset_type version;
2696 offset_type *metadata;
2699 if (dwarf2_section_empty_p (section))
2702 /* Older elfutils strip versions could keep the section in the main
2703 executable while splitting it for the separate debug info file. */
2704 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2707 dwarf2_read_section (objfile, section);
2709 addr = section->buffer;
2710 /* Version check. */
2711 version = MAYBE_SWAP (*(offset_type *) addr);
2712 /* Versions earlier than 3 emitted every copy of a psymbol. This
2713 causes the index to behave very poorly for certain requests. Version 3
2714 contained incomplete addrmap. So, it seems better to just ignore such
2718 static int warning_printed = 0;
2719 if (!warning_printed)
2721 warning (_("Skipping obsolete .gdb_index section in %s."),
2723 warning_printed = 1;
2727 /* Index version 4 uses a different hash function than index version
2730 Versions earlier than 6 did not emit psymbols for inlined
2731 functions. Using these files will cause GDB not to be able to
2732 set breakpoints on inlined functions by name, so we ignore these
2733 indices unless the user has done
2734 "set use-deprecated-index-sections on". */
2735 if (version < 6 && !deprecated_ok)
2737 static int warning_printed = 0;
2738 if (!warning_printed)
2741 Skipping deprecated .gdb_index section in %s.\n\
2742 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2743 to use the section anyway."),
2745 warning_printed = 1;
2749 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2750 of the TU (for symbols coming from TUs). It's just a performance bug, and
2751 we can't distinguish gdb-generated indices from gold-generated ones, so
2752 nothing to do here. */
2754 /* Indexes with higher version than the one supported by GDB may be no
2755 longer backward compatible. */
2759 map->version = version;
2760 map->total_size = section->size;
2762 metadata = (offset_type *) (addr + sizeof (offset_type));
2765 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2766 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2770 *types_list = addr + MAYBE_SWAP (metadata[i]);
2771 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2772 - MAYBE_SWAP (metadata[i]))
2776 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2777 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2778 - MAYBE_SWAP (metadata[i]));
2781 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2782 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2783 - MAYBE_SWAP (metadata[i]))
2784 / (2 * sizeof (offset_type)));
2787 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
2793 /* Read the index file. If everything went ok, initialize the "quick"
2794 elements of all the CUs and return 1. Otherwise, return 0. */
2797 dwarf2_read_index (struct objfile *objfile)
2799 struct mapped_index local_map, *map;
2800 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2801 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2803 if (!read_index_from_section (objfile, objfile->name,
2804 use_deprecated_index_sections,
2805 &dwarf2_per_objfile->gdb_index, &local_map,
2806 &cu_list, &cu_list_elements,
2807 &types_list, &types_list_elements))
2810 /* Don't use the index if it's empty. */
2811 if (local_map.symbol_table_slots == 0)
2814 /* If there is a .dwz file, read it so we can get its CU list as
2816 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
2818 struct dwz_file *dwz = dwarf2_get_dwz_file ();
2819 struct mapped_index dwz_map;
2820 const gdb_byte *dwz_types_ignore;
2821 offset_type dwz_types_elements_ignore;
2823 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2825 &dwz->gdb_index, &dwz_map,
2826 &dwz_list, &dwz_list_elements,
2828 &dwz_types_elements_ignore))
2830 warning (_("could not read '.gdb_index' section from %s; skipping"),
2831 bfd_get_filename (dwz->dwz_bfd));
2836 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2839 if (types_list_elements)
2841 struct dwarf2_section_info *section;
2843 /* We can only handle a single .debug_types when we have an
2845 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2848 section = VEC_index (dwarf2_section_info_def,
2849 dwarf2_per_objfile->types, 0);
2851 create_signatured_type_table_from_index (objfile, section, types_list,
2852 types_list_elements);
2855 create_addrmap_from_index (objfile, &local_map);
2857 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2860 dwarf2_per_objfile->index_table = map;
2861 dwarf2_per_objfile->using_index = 1;
2862 dwarf2_per_objfile->quick_file_names_table =
2863 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2868 /* A helper for the "quick" functions which sets the global
2869 dwarf2_per_objfile according to OBJFILE. */
2872 dw2_setup (struct objfile *objfile)
2874 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2875 gdb_assert (dwarf2_per_objfile);
2878 /* die_reader_func for dw2_get_file_names. */
2881 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2882 const gdb_byte *info_ptr,
2883 struct die_info *comp_unit_die,
2887 struct dwarf2_cu *cu = reader->cu;
2888 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2889 struct objfile *objfile = dwarf2_per_objfile->objfile;
2890 struct dwarf2_per_cu_data *lh_cu;
2891 struct line_header *lh;
2892 struct attribute *attr;
2894 const char *name, *comp_dir;
2896 struct quick_file_names *qfn;
2897 unsigned int line_offset;
2899 gdb_assert (! this_cu->is_debug_types);
2901 /* Our callers never want to match partial units -- instead they
2902 will match the enclosing full CU. */
2903 if (comp_unit_die->tag == DW_TAG_partial_unit)
2905 this_cu->v.quick->no_file_data = 1;
2914 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2917 struct quick_file_names find_entry;
2919 line_offset = DW_UNSND (attr);
2921 /* We may have already read in this line header (TU line header sharing).
2922 If we have we're done. */
2923 find_entry.hash.dwo_unit = cu->dwo_unit;
2924 find_entry.hash.line_offset.sect_off = line_offset;
2925 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2926 &find_entry, INSERT);
2929 lh_cu->v.quick->file_names = *slot;
2933 lh = dwarf_decode_line_header (line_offset, cu);
2937 lh_cu->v.quick->no_file_data = 1;
2941 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2942 qfn->hash.dwo_unit = cu->dwo_unit;
2943 qfn->hash.line_offset.sect_off = line_offset;
2944 gdb_assert (slot != NULL);
2947 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2949 qfn->num_file_names = lh->num_file_names;
2950 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2951 lh->num_file_names * sizeof (char *));
2952 for (i = 0; i < lh->num_file_names; ++i)
2953 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2954 qfn->real_names = NULL;
2956 free_line_header (lh);
2958 lh_cu->v.quick->file_names = qfn;
2961 /* A helper for the "quick" functions which attempts to read the line
2962 table for THIS_CU. */
2964 static struct quick_file_names *
2965 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
2967 /* This should never be called for TUs. */
2968 gdb_assert (! this_cu->is_debug_types);
2969 /* Nor type unit groups. */
2970 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
2972 if (this_cu->v.quick->file_names != NULL)
2973 return this_cu->v.quick->file_names;
2974 /* If we know there is no line data, no point in looking again. */
2975 if (this_cu->v.quick->no_file_data)
2978 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
2980 if (this_cu->v.quick->no_file_data)
2982 return this_cu->v.quick->file_names;
2985 /* A helper for the "quick" functions which computes and caches the
2986 real path for a given file name from the line table. */
2989 dw2_get_real_path (struct objfile *objfile,
2990 struct quick_file_names *qfn, int index)
2992 if (qfn->real_names == NULL)
2993 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
2994 qfn->num_file_names, sizeof (char *));
2996 if (qfn->real_names[index] == NULL)
2997 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
2999 return qfn->real_names[index];
3002 static struct symtab *
3003 dw2_find_last_source_symtab (struct objfile *objfile)
3007 dw2_setup (objfile);
3008 index = dwarf2_per_objfile->n_comp_units - 1;
3009 return dw2_instantiate_symtab (dw2_get_cu (index));
3012 /* Traversal function for dw2_forget_cached_source_info. */
3015 dw2_free_cached_file_names (void **slot, void *info)
3017 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3019 if (file_data->real_names)
3023 for (i = 0; i < file_data->num_file_names; ++i)
3025 xfree ((void*) file_data->real_names[i]);
3026 file_data->real_names[i] = NULL;
3034 dw2_forget_cached_source_info (struct objfile *objfile)
3036 dw2_setup (objfile);
3038 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3039 dw2_free_cached_file_names, NULL);
3042 /* Helper function for dw2_map_symtabs_matching_filename that expands
3043 the symtabs and calls the iterator. */
3046 dw2_map_expand_apply (struct objfile *objfile,
3047 struct dwarf2_per_cu_data *per_cu,
3048 const char *name, const char *real_path,
3049 int (*callback) (struct symtab *, void *),
3052 struct symtab *last_made = objfile->symtabs;
3054 /* Don't visit already-expanded CUs. */
3055 if (per_cu->v.quick->symtab)
3058 /* This may expand more than one symtab, and we want to iterate over
3060 dw2_instantiate_symtab (per_cu);
3062 return iterate_over_some_symtabs (name, real_path, callback, data,
3063 objfile->symtabs, last_made);
3066 /* Implementation of the map_symtabs_matching_filename method. */
3069 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3070 const char *real_path,
3071 int (*callback) (struct symtab *, void *),
3075 const char *name_basename = lbasename (name);
3077 dw2_setup (objfile);
3079 /* The rule is CUs specify all the files, including those used by
3080 any TU, so there's no need to scan TUs here. */
3082 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3085 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3086 struct quick_file_names *file_data;
3088 /* We only need to look at symtabs not already expanded. */
3089 if (per_cu->v.quick->symtab)
3092 file_data = dw2_get_file_names (per_cu);
3093 if (file_data == NULL)
3096 for (j = 0; j < file_data->num_file_names; ++j)
3098 const char *this_name = file_data->file_names[j];
3099 const char *this_real_name;
3101 if (compare_filenames_for_search (this_name, name))
3103 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3109 /* Before we invoke realpath, which can get expensive when many
3110 files are involved, do a quick comparison of the basenames. */
3111 if (! basenames_may_differ
3112 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3115 this_real_name = dw2_get_real_path (objfile, file_data, j);
3116 if (compare_filenames_for_search (this_real_name, name))
3118 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3124 if (real_path != NULL)
3126 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3127 gdb_assert (IS_ABSOLUTE_PATH (name));
3128 if (this_real_name != NULL
3129 && FILENAME_CMP (real_path, this_real_name) == 0)
3131 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3143 /* Struct used to manage iterating over all CUs looking for a symbol. */
3145 struct dw2_symtab_iterator
3147 /* The internalized form of .gdb_index. */
3148 struct mapped_index *index;
3149 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3150 int want_specific_block;
3151 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3152 Unused if !WANT_SPECIFIC_BLOCK. */
3154 /* The kind of symbol we're looking for. */
3156 /* The list of CUs from the index entry of the symbol,
3157 or NULL if not found. */
3159 /* The next element in VEC to look at. */
3161 /* The number of elements in VEC, or zero if there is no match. */
3165 /* Initialize the index symtab iterator ITER.
3166 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3167 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3170 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3171 struct mapped_index *index,
3172 int want_specific_block,
3177 iter->index = index;
3178 iter->want_specific_block = want_specific_block;
3179 iter->block_index = block_index;
3180 iter->domain = domain;
3183 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3184 iter->length = MAYBE_SWAP (*iter->vec);
3192 /* Return the next matching CU or NULL if there are no more. */
3194 static struct dwarf2_per_cu_data *
3195 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3197 for ( ; iter->next < iter->length; ++iter->next)
3199 offset_type cu_index_and_attrs =
3200 MAYBE_SWAP (iter->vec[iter->next + 1]);
3201 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3202 struct dwarf2_per_cu_data *per_cu;
3203 int want_static = iter->block_index != GLOBAL_BLOCK;
3204 /* This value is only valid for index versions >= 7. */
3205 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3206 gdb_index_symbol_kind symbol_kind =
3207 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3208 /* Only check the symbol attributes if they're present.
3209 Indices prior to version 7 don't record them,
3210 and indices >= 7 may elide them for certain symbols
3211 (gold does this). */
3213 (iter->index->version >= 7
3214 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3216 /* Don't crash on bad data. */
3217 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3218 + dwarf2_per_objfile->n_type_units))
3220 complaint (&symfile_complaints,
3221 _(".gdb_index entry has bad CU index"
3222 " [in module %s]"), dwarf2_per_objfile->objfile->name);
3226 per_cu = dw2_get_cu (cu_index);
3228 /* Skip if already read in. */
3229 if (per_cu->v.quick->symtab)
3233 && iter->want_specific_block
3234 && want_static != is_static)
3237 /* Only check the symbol's kind if it has one. */
3240 switch (iter->domain)
3243 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3244 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3245 /* Some types are also in VAR_DOMAIN. */
3246 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3250 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3254 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3269 static struct symtab *
3270 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3271 const char *name, domain_enum domain)
3273 struct symtab *stab_best = NULL;
3274 struct mapped_index *index;
3276 dw2_setup (objfile);
3278 index = dwarf2_per_objfile->index_table;
3280 /* index is NULL if OBJF_READNOW. */
3283 struct dw2_symtab_iterator iter;
3284 struct dwarf2_per_cu_data *per_cu;
3286 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3288 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3290 struct symbol *sym = NULL;
3291 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3293 /* Some caution must be observed with overloaded functions
3294 and methods, since the index will not contain any overload
3295 information (but NAME might contain it). */
3298 struct blockvector *bv = BLOCKVECTOR (stab);
3299 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3301 sym = lookup_block_symbol (block, name, domain);
3304 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3306 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3312 /* Keep looking through other CUs. */
3320 dw2_print_stats (struct objfile *objfile)
3322 int i, total, count;
3324 dw2_setup (objfile);
3325 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3327 for (i = 0; i < total; ++i)
3329 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3331 if (!per_cu->v.quick->symtab)
3334 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3335 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3339 dw2_dump (struct objfile *objfile)
3341 /* Nothing worth printing. */
3345 dw2_relocate (struct objfile *objfile,
3346 const struct section_offsets *new_offsets,
3347 const struct section_offsets *delta)
3349 /* There's nothing to relocate here. */
3353 dw2_expand_symtabs_for_function (struct objfile *objfile,
3354 const char *func_name)
3356 struct mapped_index *index;
3358 dw2_setup (objfile);
3360 index = dwarf2_per_objfile->index_table;
3362 /* index is NULL if OBJF_READNOW. */
3365 struct dw2_symtab_iterator iter;
3366 struct dwarf2_per_cu_data *per_cu;
3368 /* Note: It doesn't matter what we pass for block_index here. */
3369 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3372 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3373 dw2_instantiate_symtab (per_cu);
3378 dw2_expand_all_symtabs (struct objfile *objfile)
3382 dw2_setup (objfile);
3384 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3385 + dwarf2_per_objfile->n_type_units); ++i)
3387 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3389 dw2_instantiate_symtab (per_cu);
3394 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3395 const char *fullname)
3399 dw2_setup (objfile);
3401 /* We don't need to consider type units here.
3402 This is only called for examining code, e.g. expand_line_sal.
3403 There can be an order of magnitude (or more) more type units
3404 than comp units, and we avoid them if we can. */
3406 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3409 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3410 struct quick_file_names *file_data;
3412 /* We only need to look at symtabs not already expanded. */
3413 if (per_cu->v.quick->symtab)
3416 file_data = dw2_get_file_names (per_cu);
3417 if (file_data == NULL)
3420 for (j = 0; j < file_data->num_file_names; ++j)
3422 const char *this_fullname = file_data->file_names[j];
3424 if (filename_cmp (this_fullname, fullname) == 0)
3426 dw2_instantiate_symtab (per_cu);
3433 /* A helper function for dw2_find_symbol_file that finds the primary
3434 file name for a given CU. This is a die_reader_func. */
3437 dw2_get_primary_filename_reader (const struct die_reader_specs *reader,
3438 const gdb_byte *info_ptr,
3439 struct die_info *comp_unit_die,
3443 const char **result_ptr = data;
3444 struct dwarf2_cu *cu = reader->cu;
3445 struct attribute *attr;
3447 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
3451 *result_ptr = DW_STRING (attr);
3455 dw2_find_symbol_file (struct objfile *objfile, const char *name)
3457 struct dwarf2_per_cu_data *per_cu;
3459 const char *filename;
3461 dw2_setup (objfile);
3463 /* index_table is NULL if OBJF_READNOW. */
3464 if (!dwarf2_per_objfile->index_table)
3468 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
3470 struct blockvector *bv = BLOCKVECTOR (s);
3471 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
3472 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN);
3476 /* Only file extension of returned filename is recognized. */
3477 return SYMBOL_SYMTAB (sym)->filename;
3483 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table,
3487 /* Note that this just looks at the very first one named NAME -- but
3488 actually we are looking for a function. find_main_filename
3489 should be rewritten so that it doesn't require a custom hook. It
3490 could just use the ordinary symbol tables. */
3491 /* vec[0] is the length, which must always be >0. */
3492 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1])));
3494 if (per_cu->v.quick->symtab != NULL)
3496 /* Only file extension of returned filename is recognized. */
3497 return per_cu->v.quick->symtab->filename;
3500 /* Initialize filename in case there's a problem reading the DWARF,
3501 dw2_get_primary_filename_reader may not get called. */
3503 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
3504 dw2_get_primary_filename_reader, &filename);
3506 /* Only file extension of returned filename is recognized. */
3511 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3512 struct objfile *objfile, int global,
3513 int (*callback) (struct block *,
3514 struct symbol *, void *),
3515 void *data, symbol_compare_ftype *match,
3516 symbol_compare_ftype *ordered_compare)
3518 /* Currently unimplemented; used for Ada. The function can be called if the
3519 current language is Ada for a non-Ada objfile using GNU index. As Ada
3520 does not look for non-Ada symbols this function should just return. */
3524 dw2_expand_symtabs_matching
3525 (struct objfile *objfile,
3526 int (*file_matcher) (const char *, void *, int basenames),
3527 int (*name_matcher) (const char *, void *),
3528 enum search_domain kind,
3533 struct mapped_index *index;
3535 dw2_setup (objfile);
3537 /* index_table is NULL if OBJF_READNOW. */
3538 if (!dwarf2_per_objfile->index_table)
3540 index = dwarf2_per_objfile->index_table;
3542 if (file_matcher != NULL)
3544 struct cleanup *cleanup;
3545 htab_t visited_found, visited_not_found;
3547 visited_found = htab_create_alloc (10,
3548 htab_hash_pointer, htab_eq_pointer,
3549 NULL, xcalloc, xfree);
3550 cleanup = make_cleanup_htab_delete (visited_found);
3551 visited_not_found = htab_create_alloc (10,
3552 htab_hash_pointer, htab_eq_pointer,
3553 NULL, xcalloc, xfree);
3554 make_cleanup_htab_delete (visited_not_found);
3556 /* The rule is CUs specify all the files, including those used by
3557 any TU, so there's no need to scan TUs here. */
3559 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3562 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3563 struct quick_file_names *file_data;
3566 per_cu->v.quick->mark = 0;
3568 /* We only need to look at symtabs not already expanded. */
3569 if (per_cu->v.quick->symtab)
3572 file_data = dw2_get_file_names (per_cu);
3573 if (file_data == NULL)
3576 if (htab_find (visited_not_found, file_data) != NULL)
3578 else if (htab_find (visited_found, file_data) != NULL)
3580 per_cu->v.quick->mark = 1;
3584 for (j = 0; j < file_data->num_file_names; ++j)
3586 const char *this_real_name;
3588 if (file_matcher (file_data->file_names[j], data, 0))
3590 per_cu->v.quick->mark = 1;
3594 /* Before we invoke realpath, which can get expensive when many
3595 files are involved, do a quick comparison of the basenames. */
3596 if (!basenames_may_differ
3597 && !file_matcher (lbasename (file_data->file_names[j]),
3601 this_real_name = dw2_get_real_path (objfile, file_data, j);
3602 if (file_matcher (this_real_name, data, 0))
3604 per_cu->v.quick->mark = 1;
3609 slot = htab_find_slot (per_cu->v.quick->mark
3611 : visited_not_found,
3616 do_cleanups (cleanup);
3619 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3621 offset_type idx = 2 * iter;
3623 offset_type *vec, vec_len, vec_idx;
3625 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3628 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3630 if (! (*name_matcher) (name, data))
3633 /* The name was matched, now expand corresponding CUs that were
3635 vec = (offset_type *) (index->constant_pool
3636 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3637 vec_len = MAYBE_SWAP (vec[0]);
3638 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3640 struct dwarf2_per_cu_data *per_cu;
3641 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3642 gdb_index_symbol_kind symbol_kind =
3643 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3644 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3645 /* Only check the symbol attributes if they're present.
3646 Indices prior to version 7 don't record them,
3647 and indices >= 7 may elide them for certain symbols
3648 (gold does this). */
3650 (index->version >= 7
3651 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3653 /* Only check the symbol's kind if it has one. */
3658 case VARIABLES_DOMAIN:
3659 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3662 case FUNCTIONS_DOMAIN:
3663 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3667 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3675 /* Don't crash on bad data. */
3676 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3677 + dwarf2_per_objfile->n_type_units))
3679 complaint (&symfile_complaints,
3680 _(".gdb_index entry has bad CU index"
3681 " [in module %s]"), objfile->name);
3685 per_cu = dw2_get_cu (cu_index);
3686 if (file_matcher == NULL || per_cu->v.quick->mark)
3687 dw2_instantiate_symtab (per_cu);
3692 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3695 static struct symtab *
3696 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3700 if (BLOCKVECTOR (symtab) != NULL
3701 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3704 if (symtab->includes == NULL)
3707 for (i = 0; symtab->includes[i]; ++i)
3709 struct symtab *s = symtab->includes[i];
3711 s = recursively_find_pc_sect_symtab (s, pc);
3719 static struct symtab *
3720 dw2_find_pc_sect_symtab (struct objfile *objfile,
3721 struct minimal_symbol *msymbol,
3723 struct obj_section *section,
3726 struct dwarf2_per_cu_data *data;
3727 struct symtab *result;
3729 dw2_setup (objfile);
3731 if (!objfile->psymtabs_addrmap)
3734 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3738 if (warn_if_readin && data->v.quick->symtab)
3739 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3740 paddress (get_objfile_arch (objfile), pc));
3742 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3743 gdb_assert (result != NULL);
3748 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3749 void *data, int need_fullname)
3752 struct cleanup *cleanup;
3753 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3754 NULL, xcalloc, xfree);
3756 cleanup = make_cleanup_htab_delete (visited);
3757 dw2_setup (objfile);
3759 /* The rule is CUs specify all the files, including those used by
3760 any TU, so there's no need to scan TUs here.
3761 We can ignore file names coming from already-expanded CUs. */
3763 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3765 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3767 if (per_cu->v.quick->symtab)
3769 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3772 *slot = per_cu->v.quick->file_names;
3776 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3779 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3780 struct quick_file_names *file_data;
3783 /* We only need to look at symtabs not already expanded. */
3784 if (per_cu->v.quick->symtab)
3787 file_data = dw2_get_file_names (per_cu);
3788 if (file_data == NULL)
3791 slot = htab_find_slot (visited, file_data, INSERT);
3794 /* Already visited. */
3799 for (j = 0; j < file_data->num_file_names; ++j)
3801 const char *this_real_name;
3804 this_real_name = dw2_get_real_path (objfile, file_data, j);
3806 this_real_name = NULL;
3807 (*fun) (file_data->file_names[j], this_real_name, data);
3811 do_cleanups (cleanup);
3815 dw2_has_symbols (struct objfile *objfile)
3820 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3823 dw2_find_last_source_symtab,
3824 dw2_forget_cached_source_info,
3825 dw2_map_symtabs_matching_filename,
3830 dw2_expand_symtabs_for_function,
3831 dw2_expand_all_symtabs,
3832 dw2_expand_symtabs_with_fullname,
3833 dw2_find_symbol_file,
3834 dw2_map_matching_symbols,
3835 dw2_expand_symtabs_matching,
3836 dw2_find_pc_sect_symtab,
3837 dw2_map_symbol_filenames
3840 /* Initialize for reading DWARF for this objfile. Return 0 if this
3841 file will use psymtabs, or 1 if using the GNU index. */
3844 dwarf2_initialize_objfile (struct objfile *objfile)
3846 /* If we're about to read full symbols, don't bother with the
3847 indices. In this case we also don't care if some other debug
3848 format is making psymtabs, because they are all about to be
3850 if ((objfile->flags & OBJF_READNOW))
3854 dwarf2_per_objfile->using_index = 1;
3855 create_all_comp_units (objfile);
3856 create_all_type_units (objfile);
3857 dwarf2_per_objfile->quick_file_names_table =
3858 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3860 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3861 + dwarf2_per_objfile->n_type_units); ++i)
3863 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3865 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3866 struct dwarf2_per_cu_quick_data);
3869 /* Return 1 so that gdb sees the "quick" functions. However,
3870 these functions will be no-ops because we will have expanded
3875 if (dwarf2_read_index (objfile))
3883 /* Build a partial symbol table. */
3886 dwarf2_build_psymtabs (struct objfile *objfile)
3888 volatile struct gdb_exception except;
3890 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3892 init_psymbol_list (objfile, 1024);
3895 TRY_CATCH (except, RETURN_MASK_ERROR)
3897 /* This isn't really ideal: all the data we allocate on the
3898 objfile's obstack is still uselessly kept around. However,
3899 freeing it seems unsafe. */
3900 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3902 dwarf2_build_psymtabs_hard (objfile);
3903 discard_cleanups (cleanups);
3905 if (except.reason < 0)
3906 exception_print (gdb_stderr, except);
3909 /* Return the total length of the CU described by HEADER. */
3912 get_cu_length (const struct comp_unit_head *header)
3914 return header->initial_length_size + header->length;
3917 /* Return TRUE if OFFSET is within CU_HEADER. */
3920 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3922 sect_offset bottom = { cu_header->offset.sect_off };
3923 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3925 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3928 /* Find the base address of the compilation unit for range lists and
3929 location lists. It will normally be specified by DW_AT_low_pc.
3930 In DWARF-3 draft 4, the base address could be overridden by
3931 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3932 compilation units with discontinuous ranges. */
3935 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3937 struct attribute *attr;
3940 cu->base_address = 0;
3942 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3945 cu->base_address = DW_ADDR (attr);
3950 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3953 cu->base_address = DW_ADDR (attr);
3959 /* Read in the comp unit header information from the debug_info at info_ptr.
3960 NOTE: This leaves members offset, first_die_offset to be filled in
3963 static const gdb_byte *
3964 read_comp_unit_head (struct comp_unit_head *cu_header,
3965 const gdb_byte *info_ptr, bfd *abfd)
3968 unsigned int bytes_read;
3970 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3971 cu_header->initial_length_size = bytes_read;
3972 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3973 info_ptr += bytes_read;
3974 cu_header->version = read_2_bytes (abfd, info_ptr);
3976 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3978 info_ptr += bytes_read;
3979 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3981 signed_addr = bfd_get_sign_extend_vma (abfd);
3982 if (signed_addr < 0)
3983 internal_error (__FILE__, __LINE__,
3984 _("read_comp_unit_head: dwarf from non elf file"));
3985 cu_header->signed_addr_p = signed_addr;
3990 /* Helper function that returns the proper abbrev section for
3993 static struct dwarf2_section_info *
3994 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
3996 struct dwarf2_section_info *abbrev;
3998 if (this_cu->is_dwz)
3999 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4001 abbrev = &dwarf2_per_objfile->abbrev;
4006 /* Subroutine of read_and_check_comp_unit_head and
4007 read_and_check_type_unit_head to simplify them.
4008 Perform various error checking on the header. */
4011 error_check_comp_unit_head (struct comp_unit_head *header,
4012 struct dwarf2_section_info *section,
4013 struct dwarf2_section_info *abbrev_section)
4015 bfd *abfd = section->asection->owner;
4016 const char *filename = bfd_get_filename (abfd);
4018 if (header->version != 2 && header->version != 3 && header->version != 4)
4019 error (_("Dwarf Error: wrong version in compilation unit header "
4020 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
4023 if (header->abbrev_offset.sect_off
4024 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4025 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
4026 "(offset 0x%lx + 6) [in module %s]"),
4027 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
4030 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4031 avoid potential 32-bit overflow. */
4032 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4034 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4035 "(offset 0x%lx + 0) [in module %s]"),
4036 (long) header->length, (long) header->offset.sect_off,
4040 /* Read in a CU/TU header and perform some basic error checking.
4041 The contents of the header are stored in HEADER.
4042 The result is a pointer to the start of the first DIE. */
4044 static const gdb_byte *
4045 read_and_check_comp_unit_head (struct comp_unit_head *header,
4046 struct dwarf2_section_info *section,
4047 struct dwarf2_section_info *abbrev_section,
4048 const gdb_byte *info_ptr,
4049 int is_debug_types_section)
4051 const gdb_byte *beg_of_comp_unit = info_ptr;
4052 bfd *abfd = section->asection->owner;
4054 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4056 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4058 /* If we're reading a type unit, skip over the signature and
4059 type_offset fields. */
4060 if (is_debug_types_section)
4061 info_ptr += 8 /*signature*/ + header->offset_size;
4063 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4065 error_check_comp_unit_head (header, section, abbrev_section);
4070 /* Read in the types comp unit header information from .debug_types entry at
4071 types_ptr. The result is a pointer to one past the end of the header. */
4073 static const gdb_byte *
4074 read_and_check_type_unit_head (struct comp_unit_head *header,
4075 struct dwarf2_section_info *section,
4076 struct dwarf2_section_info *abbrev_section,
4077 const gdb_byte *info_ptr,
4078 ULONGEST *signature,
4079 cu_offset *type_offset_in_tu)
4081 const gdb_byte *beg_of_comp_unit = info_ptr;
4082 bfd *abfd = section->asection->owner;
4084 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4086 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4088 /* If we're reading a type unit, skip over the signature and
4089 type_offset fields. */
4090 if (signature != NULL)
4091 *signature = read_8_bytes (abfd, info_ptr);
4093 if (type_offset_in_tu != NULL)
4094 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4095 header->offset_size);
4096 info_ptr += header->offset_size;
4098 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4100 error_check_comp_unit_head (header, section, abbrev_section);
4105 /* Fetch the abbreviation table offset from a comp or type unit header. */
4108 read_abbrev_offset (struct dwarf2_section_info *section,
4111 bfd *abfd = section->asection->owner;
4112 const gdb_byte *info_ptr;
4113 unsigned int length, initial_length_size, offset_size;
4114 sect_offset abbrev_offset;
4116 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4117 info_ptr = section->buffer + offset.sect_off;
4118 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4119 offset_size = initial_length_size == 4 ? 4 : 8;
4120 info_ptr += initial_length_size + 2 /*version*/;
4121 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4122 return abbrev_offset;
4125 /* Allocate a new partial symtab for file named NAME and mark this new
4126 partial symtab as being an include of PST. */
4129 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4130 struct objfile *objfile)
4132 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4134 if (!IS_ABSOLUTE_PATH (subpst->filename))
4136 /* It shares objfile->objfile_obstack. */
4137 subpst->dirname = pst->dirname;
4140 subpst->section_offsets = pst->section_offsets;
4141 subpst->textlow = 0;
4142 subpst->texthigh = 0;
4144 subpst->dependencies = (struct partial_symtab **)
4145 obstack_alloc (&objfile->objfile_obstack,
4146 sizeof (struct partial_symtab *));
4147 subpst->dependencies[0] = pst;
4148 subpst->number_of_dependencies = 1;
4150 subpst->globals_offset = 0;
4151 subpst->n_global_syms = 0;
4152 subpst->statics_offset = 0;
4153 subpst->n_static_syms = 0;
4154 subpst->symtab = NULL;
4155 subpst->read_symtab = pst->read_symtab;
4158 /* No private part is necessary for include psymtabs. This property
4159 can be used to differentiate between such include psymtabs and
4160 the regular ones. */
4161 subpst->read_symtab_private = NULL;
4164 /* Read the Line Number Program data and extract the list of files
4165 included by the source file represented by PST. Build an include
4166 partial symtab for each of these included files. */
4169 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4170 struct die_info *die,
4171 struct partial_symtab *pst)
4173 struct line_header *lh = NULL;
4174 struct attribute *attr;
4176 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4178 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4180 return; /* No linetable, so no includes. */
4182 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4183 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4185 free_line_header (lh);
4189 hash_signatured_type (const void *item)
4191 const struct signatured_type *sig_type = item;
4193 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4194 return sig_type->signature;
4198 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4200 const struct signatured_type *lhs = item_lhs;
4201 const struct signatured_type *rhs = item_rhs;
4203 return lhs->signature == rhs->signature;
4206 /* Allocate a hash table for signatured types. */
4209 allocate_signatured_type_table (struct objfile *objfile)
4211 return htab_create_alloc_ex (41,
4212 hash_signatured_type,
4215 &objfile->objfile_obstack,
4216 hashtab_obstack_allocate,
4217 dummy_obstack_deallocate);
4220 /* A helper function to add a signatured type CU to a table. */
4223 add_signatured_type_cu_to_table (void **slot, void *datum)
4225 struct signatured_type *sigt = *slot;
4226 struct signatured_type ***datap = datum;
4234 /* Create the hash table of all entries in the .debug_types
4235 (or .debug_types.dwo) section(s).
4236 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4237 otherwise it is NULL.
4239 The result is a pointer to the hash table or NULL if there are no types.
4241 Note: This function processes DWO files only, not DWP files. */
4244 create_debug_types_hash_table (struct dwo_file *dwo_file,
4245 VEC (dwarf2_section_info_def) *types)
4247 struct objfile *objfile = dwarf2_per_objfile->objfile;
4248 htab_t types_htab = NULL;
4250 struct dwarf2_section_info *section;
4251 struct dwarf2_section_info *abbrev_section;
4253 if (VEC_empty (dwarf2_section_info_def, types))
4256 abbrev_section = (dwo_file != NULL
4257 ? &dwo_file->sections.abbrev
4258 : &dwarf2_per_objfile->abbrev);
4260 if (dwarf2_read_debug)
4261 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4262 dwo_file ? ".dwo" : "",
4263 bfd_get_filename (abbrev_section->asection->owner));
4266 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4270 const gdb_byte *info_ptr, *end_ptr;
4271 struct dwarf2_section_info *abbrev_section;
4273 dwarf2_read_section (objfile, section);
4274 info_ptr = section->buffer;
4276 if (info_ptr == NULL)
4279 /* We can't set abfd until now because the section may be empty or
4280 not present, in which case section->asection will be NULL. */
4281 abfd = section->asection->owner;
4284 abbrev_section = &dwo_file->sections.abbrev;
4286 abbrev_section = &dwarf2_per_objfile->abbrev;
4288 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4289 because we don't need to read any dies: the signature is in the
4292 end_ptr = info_ptr + section->size;
4293 while (info_ptr < end_ptr)
4296 cu_offset type_offset_in_tu;
4298 struct signatured_type *sig_type;
4299 struct dwo_unit *dwo_tu;
4301 const gdb_byte *ptr = info_ptr;
4302 struct comp_unit_head header;
4303 unsigned int length;
4305 offset.sect_off = ptr - section->buffer;
4307 /* We need to read the type's signature in order to build the hash
4308 table, but we don't need anything else just yet. */
4310 ptr = read_and_check_type_unit_head (&header, section,
4311 abbrev_section, ptr,
4312 &signature, &type_offset_in_tu);
4314 length = get_cu_length (&header);
4316 /* Skip dummy type units. */
4317 if (ptr >= info_ptr + length
4318 || peek_abbrev_code (abfd, ptr) == 0)
4324 if (types_htab == NULL)
4327 types_htab = allocate_dwo_unit_table (objfile);
4329 types_htab = allocate_signatured_type_table (objfile);
4335 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4337 dwo_tu->dwo_file = dwo_file;
4338 dwo_tu->signature = signature;
4339 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4340 dwo_tu->section = section;
4341 dwo_tu->offset = offset;
4342 dwo_tu->length = length;
4346 /* N.B.: type_offset is not usable if this type uses a DWO file.
4347 The real type_offset is in the DWO file. */
4349 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4350 struct signatured_type);
4351 sig_type->signature = signature;
4352 sig_type->type_offset_in_tu = type_offset_in_tu;
4353 sig_type->per_cu.objfile = objfile;
4354 sig_type->per_cu.is_debug_types = 1;
4355 sig_type->per_cu.section = section;
4356 sig_type->per_cu.offset = offset;
4357 sig_type->per_cu.length = length;
4360 slot = htab_find_slot (types_htab,
4361 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4363 gdb_assert (slot != NULL);
4366 sect_offset dup_offset;
4370 const struct dwo_unit *dup_tu = *slot;
4372 dup_offset = dup_tu->offset;
4376 const struct signatured_type *dup_tu = *slot;
4378 dup_offset = dup_tu->per_cu.offset;
4381 complaint (&symfile_complaints,
4382 _("debug type entry at offset 0x%x is duplicate to"
4383 " the entry at offset 0x%x, signature %s"),
4384 offset.sect_off, dup_offset.sect_off,
4385 hex_string (signature));
4387 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4389 if (dwarf2_read_debug)
4390 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4392 hex_string (signature));
4401 /* Create the hash table of all entries in the .debug_types section,
4402 and initialize all_type_units.
4403 The result is zero if there is an error (e.g. missing .debug_types section),
4404 otherwise non-zero. */
4407 create_all_type_units (struct objfile *objfile)
4410 struct signatured_type **iter;
4412 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4413 if (types_htab == NULL)
4415 dwarf2_per_objfile->signatured_types = NULL;
4419 dwarf2_per_objfile->signatured_types = types_htab;
4421 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4422 dwarf2_per_objfile->all_type_units
4423 = xmalloc (dwarf2_per_objfile->n_type_units
4424 * sizeof (struct signatured_type *));
4425 iter = &dwarf2_per_objfile->all_type_units[0];
4426 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4427 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4428 == dwarf2_per_objfile->n_type_units);
4433 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4434 Fill in SIG_ENTRY with DWO_ENTRY. */
4437 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4438 struct signatured_type *sig_entry,
4439 struct dwo_unit *dwo_entry)
4441 sig_entry->per_cu.section = dwo_entry->section;
4442 sig_entry->per_cu.offset = dwo_entry->offset;
4443 sig_entry->per_cu.length = dwo_entry->length;
4444 sig_entry->per_cu.reading_dwo_directly = 1;
4445 sig_entry->per_cu.objfile = objfile;
4446 gdb_assert (! sig_entry->per_cu.queued);
4447 gdb_assert (sig_entry->per_cu.cu == NULL);
4448 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4449 gdb_assert (sig_entry->per_cu.v.quick->symtab == NULL);
4450 gdb_assert (sig_entry->signature == dwo_entry->signature);
4451 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4452 gdb_assert (sig_entry->type_unit_group == NULL);
4453 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4454 sig_entry->dwo_unit = dwo_entry;
4457 /* Subroutine of lookup_signatured_type.
4458 Create the signatured_type data structure for a TU to be read in
4459 directly from a DWO file, bypassing the stub.
4460 We do this for the case where there is no DWP file and we're using
4461 .gdb_index: When reading a CU we want to stay in the DWO file containing
4462 that CU. Otherwise we could end up reading several other DWO files (due
4463 to comdat folding) to process the transitive closure of all the mentioned
4464 TUs, and that can be slow. The current DWO file will have every type
4465 signature that it needs.
4466 We only do this for .gdb_index because in the psymtab case we already have
4467 to read all the DWOs to build the type unit groups. */
4469 static struct signatured_type *
4470 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4472 struct objfile *objfile = dwarf2_per_objfile->objfile;
4473 struct dwo_file *dwo_file;
4474 struct dwo_unit find_dwo_entry, *dwo_entry;
4475 struct signatured_type find_sig_entry, *sig_entry;
4477 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4479 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4480 dwo_unit of the TU itself. */
4481 dwo_file = cu->dwo_unit->dwo_file;
4483 /* We only ever need to read in one copy of a signatured type.
4484 Just use the global signatured_types array. If this is the first time
4485 we're reading this type, replace the recorded data from .gdb_index with
4488 if (dwarf2_per_objfile->signatured_types == NULL)
4490 find_sig_entry.signature = sig;
4491 sig_entry = htab_find (dwarf2_per_objfile->signatured_types, &find_sig_entry);
4492 if (sig_entry == NULL)
4494 /* Have we already tried to read this TU? */
4495 if (sig_entry->dwo_unit != NULL)
4498 /* Ok, this is the first time we're reading this TU. */
4499 if (dwo_file->tus == NULL)
4501 find_dwo_entry.signature = sig;
4502 dwo_entry = htab_find (dwo_file->tus, &find_dwo_entry);
4503 if (dwo_entry == NULL)
4506 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4510 /* Subroutine of lookup_dwp_signatured_type.
4511 Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. */
4513 static struct signatured_type *
4514 add_type_unit (ULONGEST sig)
4516 struct objfile *objfile = dwarf2_per_objfile->objfile;
4517 int n_type_units = dwarf2_per_objfile->n_type_units;
4518 struct signatured_type *sig_type;
4522 dwarf2_per_objfile->all_type_units =
4523 xrealloc (dwarf2_per_objfile->all_type_units,
4524 n_type_units * sizeof (struct signatured_type *));
4525 dwarf2_per_objfile->n_type_units = n_type_units;
4526 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4527 struct signatured_type);
4528 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4529 sig_type->signature = sig;
4530 sig_type->per_cu.is_debug_types = 1;
4531 sig_type->per_cu.v.quick =
4532 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4533 struct dwarf2_per_cu_quick_data);
4534 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4536 gdb_assert (*slot == NULL);
4538 /* The rest of sig_type must be filled in by the caller. */
4542 /* Subroutine of lookup_signatured_type.
4543 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4544 then try the DWP file.
4545 Normally this "can't happen", but if there's a bug in signature
4546 generation and/or the DWP file is built incorrectly, it can happen.
4547 Using the type directly from the DWP file means we don't have the stub
4548 which has some useful attributes (e.g., DW_AT_comp_dir), but they're
4549 not critical. [Eventually the stub may go away for type units anyway.] */
4551 static struct signatured_type *
4552 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4554 struct objfile *objfile = dwarf2_per_objfile->objfile;
4555 struct dwp_file *dwp_file = get_dwp_file ();
4556 struct dwo_unit *dwo_entry;
4557 struct signatured_type find_sig_entry, *sig_entry;
4559 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4560 gdb_assert (dwp_file != NULL);
4562 if (dwarf2_per_objfile->signatured_types != NULL)
4564 find_sig_entry.signature = sig;
4565 sig_entry = htab_find (dwarf2_per_objfile->signatured_types,
4567 if (sig_entry != NULL)
4571 /* This is the "shouldn't happen" case.
4572 Try the DWP file and hope for the best. */
4573 if (dwp_file->tus == NULL)
4575 dwo_entry = lookup_dwo_in_dwp (dwp_file, dwp_file->tus, NULL,
4576 sig, 1 /* is_debug_types */);
4577 if (dwo_entry == NULL)
4580 sig_entry = add_type_unit (sig);
4581 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4583 /* The caller will signal a complaint if we return NULL.
4584 Here we don't return NULL but we still want to complain. */
4585 complaint (&symfile_complaints,
4586 _("Bad type signature %s referenced by %s at 0x%x,"
4587 " coping by using copy in DWP [in module %s]"),
4589 cu->per_cu->is_debug_types ? "TU" : "CU",
4590 cu->per_cu->offset.sect_off,
4596 /* Lookup a signature based type for DW_FORM_ref_sig8.
4597 Returns NULL if signature SIG is not present in the table.
4598 It is up to the caller to complain about this. */
4600 static struct signatured_type *
4601 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4604 && dwarf2_per_objfile->using_index)
4606 /* We're in a DWO/DWP file, and we're using .gdb_index.
4607 These cases require special processing. */
4608 if (get_dwp_file () == NULL)
4609 return lookup_dwo_signatured_type (cu, sig);
4611 return lookup_dwp_signatured_type (cu, sig);
4615 struct signatured_type find_entry, *entry;
4617 if (dwarf2_per_objfile->signatured_types == NULL)
4619 find_entry.signature = sig;
4620 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4625 /* Low level DIE reading support. */
4627 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4630 init_cu_die_reader (struct die_reader_specs *reader,
4631 struct dwarf2_cu *cu,
4632 struct dwarf2_section_info *section,
4633 struct dwo_file *dwo_file)
4635 gdb_assert (section->readin && section->buffer != NULL);
4636 reader->abfd = section->asection->owner;
4638 reader->dwo_file = dwo_file;
4639 reader->die_section = section;
4640 reader->buffer = section->buffer;
4641 reader->buffer_end = section->buffer + section->size;
4642 reader->comp_dir = NULL;
4645 /* Subroutine of init_cutu_and_read_dies to simplify it.
4646 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4647 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4650 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4651 from it to the DIE in the DWO. If NULL we are skipping the stub.
4652 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
4653 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
4654 attribute of the referencing CU. Exactly one of STUB_COMP_UNIT_DIE and
4655 COMP_DIR must be non-NULL.
4656 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4657 are filled in with the info of the DIE from the DWO file.
4658 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4659 provided an abbrev table to use.
4660 The result is non-zero if a valid (non-dummy) DIE was found. */
4663 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4664 struct dwo_unit *dwo_unit,
4665 int abbrev_table_provided,
4666 struct die_info *stub_comp_unit_die,
4667 const char *stub_comp_dir,
4668 struct die_reader_specs *result_reader,
4669 const gdb_byte **result_info_ptr,
4670 struct die_info **result_comp_unit_die,
4671 int *result_has_children)
4673 struct objfile *objfile = dwarf2_per_objfile->objfile;
4674 struct dwarf2_cu *cu = this_cu->cu;
4675 struct dwarf2_section_info *section;
4677 const gdb_byte *begin_info_ptr, *info_ptr;
4678 const char *comp_dir_string;
4679 ULONGEST signature; /* Or dwo_id. */
4680 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4681 int i,num_extra_attrs;
4682 struct dwarf2_section_info *dwo_abbrev_section;
4683 struct attribute *attr;
4684 struct attribute comp_dir_attr;
4685 struct die_info *comp_unit_die;
4687 /* Both can't be provided. */
4688 gdb_assert (! (stub_comp_unit_die && stub_comp_dir));
4690 /* These attributes aren't processed until later:
4691 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4692 However, the attribute is found in the stub which we won't have later.
4693 In order to not impose this complication on the rest of the code,
4694 we read them here and copy them to the DWO CU/TU die. */
4702 if (stub_comp_unit_die != NULL)
4704 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4706 if (! this_cu->is_debug_types)
4707 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4708 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4709 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4710 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4711 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4713 /* There should be a DW_AT_addr_base attribute here (if needed).
4714 We need the value before we can process DW_FORM_GNU_addr_index. */
4716 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4718 cu->addr_base = DW_UNSND (attr);
4720 /* There should be a DW_AT_ranges_base attribute here (if needed).
4721 We need the value before we can process DW_AT_ranges. */
4722 cu->ranges_base = 0;
4723 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4725 cu->ranges_base = DW_UNSND (attr);
4727 else if (stub_comp_dir != NULL)
4729 /* Reconstruct the comp_dir attribute to simplify the code below. */
4730 comp_dir = (struct attribute *)
4731 obstack_alloc (&cu->comp_unit_obstack, sizeof (*comp_dir));
4732 comp_dir->name = DW_AT_comp_dir;
4733 comp_dir->form = DW_FORM_string;
4734 DW_STRING_IS_CANONICAL (comp_dir) = 0;
4735 DW_STRING (comp_dir) = stub_comp_dir;
4738 /* Set up for reading the DWO CU/TU. */
4739 cu->dwo_unit = dwo_unit;
4740 section = dwo_unit->section;
4741 dwarf2_read_section (objfile, section);
4742 abfd = section->asection->owner;
4743 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4744 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4745 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
4747 if (this_cu->is_debug_types)
4749 ULONGEST header_signature;
4750 cu_offset type_offset_in_tu;
4751 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
4753 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4757 &type_offset_in_tu);
4758 /* This is not an assert because it can be caused by bad debug info. */
4759 if (sig_type->signature != header_signature)
4761 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
4762 " TU at offset 0x%x [in module %s]"),
4763 hex_string (sig_type->signature),
4764 hex_string (header_signature),
4765 dwo_unit->offset.sect_off,
4766 bfd_get_filename (abfd));
4768 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4769 /* For DWOs coming from DWP files, we don't know the CU length
4770 nor the type's offset in the TU until now. */
4771 dwo_unit->length = get_cu_length (&cu->header);
4772 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4774 /* Establish the type offset that can be used to lookup the type.
4775 For DWO files, we don't know it until now. */
4776 sig_type->type_offset_in_section.sect_off =
4777 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4781 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4784 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4785 /* For DWOs coming from DWP files, we don't know the CU length
4787 dwo_unit->length = get_cu_length (&cu->header);
4790 /* Replace the CU's original abbrev table with the DWO's.
4791 Reminder: We can't read the abbrev table until we've read the header. */
4792 if (abbrev_table_provided)
4794 /* Don't free the provided abbrev table, the caller of
4795 init_cutu_and_read_dies owns it. */
4796 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4797 /* Ensure the DWO abbrev table gets freed. */
4798 make_cleanup (dwarf2_free_abbrev_table, cu);
4802 dwarf2_free_abbrev_table (cu);
4803 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4804 /* Leave any existing abbrev table cleanup as is. */
4807 /* Read in the die, but leave space to copy over the attributes
4808 from the stub. This has the benefit of simplifying the rest of
4809 the code - all the work to maintain the illusion of a single
4810 DW_TAG_{compile,type}_unit DIE is done here. */
4811 num_extra_attrs = ((stmt_list != NULL)
4815 + (comp_dir != NULL));
4816 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
4817 result_has_children, num_extra_attrs);
4819 /* Copy over the attributes from the stub to the DIE we just read in. */
4820 comp_unit_die = *result_comp_unit_die;
4821 i = comp_unit_die->num_attrs;
4822 if (stmt_list != NULL)
4823 comp_unit_die->attrs[i++] = *stmt_list;
4825 comp_unit_die->attrs[i++] = *low_pc;
4826 if (high_pc != NULL)
4827 comp_unit_die->attrs[i++] = *high_pc;
4829 comp_unit_die->attrs[i++] = *ranges;
4830 if (comp_dir != NULL)
4831 comp_unit_die->attrs[i++] = *comp_dir;
4832 comp_unit_die->num_attrs += num_extra_attrs;
4834 if (dwarf2_die_debug)
4836 fprintf_unfiltered (gdb_stdlog,
4837 "Read die from %s@0x%x of %s:\n",
4838 bfd_section_name (abfd, section->asection),
4839 (unsigned) (begin_info_ptr - section->buffer),
4840 bfd_get_filename (abfd));
4841 dump_die (comp_unit_die, dwarf2_die_debug);
4844 /* Save the comp_dir attribute. If there is no DWP file then we'll read
4845 TUs by skipping the stub and going directly to the entry in the DWO file.
4846 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
4847 to get it via circuitous means. Blech. */
4848 if (comp_dir != NULL)
4849 result_reader->comp_dir = DW_STRING (comp_dir);
4851 /* Skip dummy compilation units. */
4852 if (info_ptr >= begin_info_ptr + dwo_unit->length
4853 || peek_abbrev_code (abfd, info_ptr) == 0)
4856 *result_info_ptr = info_ptr;
4860 /* Subroutine of init_cutu_and_read_dies to simplify it.
4861 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
4862 Returns NULL if the specified DWO unit cannot be found. */
4864 static struct dwo_unit *
4865 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
4866 struct die_info *comp_unit_die)
4868 struct dwarf2_cu *cu = this_cu->cu;
4869 struct attribute *attr;
4871 struct dwo_unit *dwo_unit;
4872 const char *comp_dir, *dwo_name;
4874 gdb_assert (cu != NULL);
4876 /* Yeah, we look dwo_name up again, but it simplifies the code. */
4877 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4878 gdb_assert (attr != NULL);
4879 dwo_name = DW_STRING (attr);
4881 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4883 comp_dir = DW_STRING (attr);
4885 if (this_cu->is_debug_types)
4887 struct signatured_type *sig_type;
4889 /* Since this_cu is the first member of struct signatured_type,
4890 we can go from a pointer to one to a pointer to the other. */
4891 sig_type = (struct signatured_type *) this_cu;
4892 signature = sig_type->signature;
4893 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
4897 struct attribute *attr;
4899 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4901 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
4903 dwo_name, this_cu->objfile->name);
4904 signature = DW_UNSND (attr);
4905 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
4912 /* Subroutine of init_cutu_and_read_dies to simplify it.
4913 Read a TU directly from a DWO file, bypassing the stub. */
4916 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, int keep,
4917 die_reader_func_ftype *die_reader_func,
4920 struct dwarf2_cu *cu;
4921 struct signatured_type *sig_type;
4922 struct cleanup *cleanups, *free_cu_cleanup;
4923 struct die_reader_specs reader;
4924 const gdb_byte *info_ptr;
4925 struct die_info *comp_unit_die;
4928 /* Verify we can do the following downcast, and that we have the
4930 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
4931 sig_type = (struct signatured_type *) this_cu;
4932 gdb_assert (sig_type->dwo_unit != NULL);
4934 cleanups = make_cleanup (null_cleanup, NULL);
4936 gdb_assert (this_cu->cu == NULL);
4937 cu = xmalloc (sizeof (*cu));
4938 init_one_comp_unit (cu, this_cu);
4939 /* If an error occurs while loading, release our storage. */
4940 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4942 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
4943 0 /* abbrev_table_provided */,
4944 NULL /* stub_comp_unit_die */,
4945 sig_type->dwo_unit->dwo_file->comp_dir,
4947 &comp_unit_die, &has_children) == 0)
4950 do_cleanups (cleanups);
4954 /* All the "real" work is done here. */
4955 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4957 /* This duplicates some code in init_cutu_and_read_dies,
4958 but the alternative is making the latter more complex.
4959 This function is only for the special case of using DWO files directly:
4960 no point in overly complicating the general case just to handle this. */
4963 /* We've successfully allocated this compilation unit. Let our
4964 caller clean it up when finished with it. */
4965 discard_cleanups (free_cu_cleanup);
4967 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4968 So we have to manually free the abbrev table. */
4969 dwarf2_free_abbrev_table (cu);
4971 /* Link this CU into read_in_chain. */
4972 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4973 dwarf2_per_objfile->read_in_chain = this_cu;
4976 do_cleanups (free_cu_cleanup);
4978 do_cleanups (cleanups);
4981 /* Initialize a CU (or TU) and read its DIEs.
4982 If the CU defers to a DWO file, read the DWO file as well.
4984 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4985 Otherwise the table specified in the comp unit header is read in and used.
4986 This is an optimization for when we already have the abbrev table.
4988 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4989 Otherwise, a new CU is allocated with xmalloc.
4991 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4992 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4994 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4995 linker) then DIE_READER_FUNC will not get called. */
4998 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
4999 struct abbrev_table *abbrev_table,
5000 int use_existing_cu, int keep,
5001 die_reader_func_ftype *die_reader_func,
5004 struct objfile *objfile = dwarf2_per_objfile->objfile;
5005 struct dwarf2_section_info *section = this_cu->section;
5006 bfd *abfd = section->asection->owner;
5007 struct dwarf2_cu *cu;
5008 const gdb_byte *begin_info_ptr, *info_ptr;
5009 struct die_reader_specs reader;
5010 struct die_info *comp_unit_die;
5012 struct attribute *attr;
5013 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5014 struct signatured_type *sig_type = NULL;
5015 struct dwarf2_section_info *abbrev_section;
5016 /* Non-zero if CU currently points to a DWO file and we need to
5017 reread it. When this happens we need to reread the skeleton die
5018 before we can reread the DWO file (this only applies to CUs, not TUs). */
5019 int rereading_dwo_cu = 0;
5021 if (dwarf2_die_debug)
5022 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5023 this_cu->is_debug_types ? "type" : "comp",
5024 this_cu->offset.sect_off);
5026 if (use_existing_cu)
5029 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5030 file (instead of going through the stub), short-circuit all of this. */
5031 if (this_cu->reading_dwo_directly)
5033 /* Narrow down the scope of possibilities to have to understand. */
5034 gdb_assert (this_cu->is_debug_types);
5035 gdb_assert (abbrev_table == NULL);
5036 gdb_assert (!use_existing_cu);
5037 init_tu_and_read_dwo_dies (this_cu, keep, die_reader_func, data);
5041 cleanups = make_cleanup (null_cleanup, NULL);
5043 /* This is cheap if the section is already read in. */
5044 dwarf2_read_section (objfile, section);
5046 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5048 abbrev_section = get_abbrev_section_for_cu (this_cu);
5050 if (use_existing_cu && this_cu->cu != NULL)
5054 /* If this CU is from a DWO file we need to start over, we need to
5055 refetch the attributes from the skeleton CU.
5056 This could be optimized by retrieving those attributes from when we
5057 were here the first time: the previous comp_unit_die was stored in
5058 comp_unit_obstack. But there's no data yet that we need this
5060 if (cu->dwo_unit != NULL)
5061 rereading_dwo_cu = 1;
5065 /* If !use_existing_cu, this_cu->cu must be NULL. */
5066 gdb_assert (this_cu->cu == NULL);
5068 cu = xmalloc (sizeof (*cu));
5069 init_one_comp_unit (cu, this_cu);
5071 /* If an error occurs while loading, release our storage. */
5072 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5075 /* Get the header. */
5076 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5078 /* We already have the header, there's no need to read it in again. */
5079 info_ptr += cu->header.first_die_offset.cu_off;
5083 if (this_cu->is_debug_types)
5086 cu_offset type_offset_in_tu;
5088 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5089 abbrev_section, info_ptr,
5091 &type_offset_in_tu);
5093 /* Since per_cu is the first member of struct signatured_type,
5094 we can go from a pointer to one to a pointer to the other. */
5095 sig_type = (struct signatured_type *) this_cu;
5096 gdb_assert (sig_type->signature == signature);
5097 gdb_assert (sig_type->type_offset_in_tu.cu_off
5098 == type_offset_in_tu.cu_off);
5099 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5101 /* LENGTH has not been set yet for type units if we're
5102 using .gdb_index. */
5103 this_cu->length = get_cu_length (&cu->header);
5105 /* Establish the type offset that can be used to lookup the type. */
5106 sig_type->type_offset_in_section.sect_off =
5107 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5111 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5115 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5116 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5120 /* Skip dummy compilation units. */
5121 if (info_ptr >= begin_info_ptr + this_cu->length
5122 || peek_abbrev_code (abfd, info_ptr) == 0)
5124 do_cleanups (cleanups);
5128 /* If we don't have them yet, read the abbrevs for this compilation unit.
5129 And if we need to read them now, make sure they're freed when we're
5130 done. Note that it's important that if the CU had an abbrev table
5131 on entry we don't free it when we're done: Somewhere up the call stack
5132 it may be in use. */
5133 if (abbrev_table != NULL)
5135 gdb_assert (cu->abbrev_table == NULL);
5136 gdb_assert (cu->header.abbrev_offset.sect_off
5137 == abbrev_table->offset.sect_off);
5138 cu->abbrev_table = abbrev_table;
5140 else if (cu->abbrev_table == NULL)
5142 dwarf2_read_abbrevs (cu, abbrev_section);
5143 make_cleanup (dwarf2_free_abbrev_table, cu);
5145 else if (rereading_dwo_cu)
5147 dwarf2_free_abbrev_table (cu);
5148 dwarf2_read_abbrevs (cu, abbrev_section);
5151 /* Read the top level CU/TU die. */
5152 init_cu_die_reader (&reader, cu, section, NULL);
5153 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5155 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5157 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5158 DWO CU, that this test will fail (the attribute will not be present). */
5159 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5162 struct dwo_unit *dwo_unit;
5163 struct die_info *dwo_comp_unit_die;
5167 complaint (&symfile_complaints,
5168 _("compilation unit with DW_AT_GNU_dwo_name"
5169 " has children (offset 0x%x) [in module %s]"),
5170 this_cu->offset.sect_off, bfd_get_filename (abfd));
5172 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5173 if (dwo_unit != NULL)
5175 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5176 abbrev_table != NULL,
5177 comp_unit_die, NULL,
5179 &dwo_comp_unit_die, &has_children) == 0)
5182 do_cleanups (cleanups);
5185 comp_unit_die = dwo_comp_unit_die;
5189 /* Yikes, we couldn't find the rest of the DIE, we only have
5190 the stub. A complaint has already been logged. There's
5191 not much more we can do except pass on the stub DIE to
5192 die_reader_func. We don't want to throw an error on bad
5197 /* All of the above is setup for this call. Yikes. */
5198 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5200 /* Done, clean up. */
5201 if (free_cu_cleanup != NULL)
5205 /* We've successfully allocated this compilation unit. Let our
5206 caller clean it up when finished with it. */
5207 discard_cleanups (free_cu_cleanup);
5209 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5210 So we have to manually free the abbrev table. */
5211 dwarf2_free_abbrev_table (cu);
5213 /* Link this CU into read_in_chain. */
5214 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5215 dwarf2_per_objfile->read_in_chain = this_cu;
5218 do_cleanups (free_cu_cleanup);
5221 do_cleanups (cleanups);
5224 /* Read CU/TU THIS_CU in section SECTION,
5225 but do not follow DW_AT_GNU_dwo_name if present.
5226 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
5227 to have already done the lookup to find the DWO/DWP file).
5229 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5230 THIS_CU->is_debug_types, but nothing else.
5232 We fill in THIS_CU->length.
5234 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5235 linker) then DIE_READER_FUNC will not get called.
5237 THIS_CU->cu is always freed when done.
5238 This is done in order to not leave THIS_CU->cu in a state where we have
5239 to care whether it refers to the "main" CU or the DWO CU. */
5242 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5243 struct dwarf2_section_info *abbrev_section,
5244 struct dwo_file *dwo_file,
5245 die_reader_func_ftype *die_reader_func,
5248 struct objfile *objfile = dwarf2_per_objfile->objfile;
5249 struct dwarf2_section_info *section = this_cu->section;
5250 bfd *abfd = section->asection->owner;
5251 struct dwarf2_cu cu;
5252 const gdb_byte *begin_info_ptr, *info_ptr;
5253 struct die_reader_specs reader;
5254 struct cleanup *cleanups;
5255 struct die_info *comp_unit_die;
5258 if (dwarf2_die_debug)
5259 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5260 this_cu->is_debug_types ? "type" : "comp",
5261 this_cu->offset.sect_off);
5263 gdb_assert (this_cu->cu == NULL);
5265 /* This is cheap if the section is already read in. */
5266 dwarf2_read_section (objfile, section);
5268 init_one_comp_unit (&cu, this_cu);
5270 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5272 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5273 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5274 abbrev_section, info_ptr,
5275 this_cu->is_debug_types);
5277 this_cu->length = get_cu_length (&cu.header);
5279 /* Skip dummy compilation units. */
5280 if (info_ptr >= begin_info_ptr + this_cu->length
5281 || peek_abbrev_code (abfd, info_ptr) == 0)
5283 do_cleanups (cleanups);
5287 dwarf2_read_abbrevs (&cu, abbrev_section);
5288 make_cleanup (dwarf2_free_abbrev_table, &cu);
5290 init_cu_die_reader (&reader, &cu, section, dwo_file);
5291 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5293 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5295 do_cleanups (cleanups);
5298 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5299 does not lookup the specified DWO file.
5300 This cannot be used to read DWO files.
5302 THIS_CU->cu is always freed when done.
5303 This is done in order to not leave THIS_CU->cu in a state where we have
5304 to care whether it refers to the "main" CU or the DWO CU.
5305 We can revisit this if the data shows there's a performance issue. */
5308 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5309 die_reader_func_ftype *die_reader_func,
5312 init_cutu_and_read_dies_no_follow (this_cu,
5313 get_abbrev_section_for_cu (this_cu),
5315 die_reader_func, data);
5318 /* Type Unit Groups.
5320 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5321 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5322 so that all types coming from the same compilation (.o file) are grouped
5323 together. A future step could be to put the types in the same symtab as
5324 the CU the types ultimately came from. */
5327 hash_type_unit_group (const void *item)
5329 const struct type_unit_group *tu_group = item;
5331 return hash_stmt_list_entry (&tu_group->hash);
5335 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5337 const struct type_unit_group *lhs = item_lhs;
5338 const struct type_unit_group *rhs = item_rhs;
5340 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5343 /* Allocate a hash table for type unit groups. */
5346 allocate_type_unit_groups_table (void)
5348 return htab_create_alloc_ex (3,
5349 hash_type_unit_group,
5352 &dwarf2_per_objfile->objfile->objfile_obstack,
5353 hashtab_obstack_allocate,
5354 dummy_obstack_deallocate);
5357 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5358 partial symtabs. We combine several TUs per psymtab to not let the size
5359 of any one psymtab grow too big. */
5360 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5361 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5363 /* Helper routine for get_type_unit_group.
5364 Create the type_unit_group object used to hold one or more TUs. */
5366 static struct type_unit_group *
5367 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5369 struct objfile *objfile = dwarf2_per_objfile->objfile;
5370 struct dwarf2_per_cu_data *per_cu;
5371 struct type_unit_group *tu_group;
5373 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5374 struct type_unit_group);
5375 per_cu = &tu_group->per_cu;
5376 per_cu->objfile = objfile;
5378 if (dwarf2_per_objfile->using_index)
5380 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5381 struct dwarf2_per_cu_quick_data);
5385 unsigned int line_offset = line_offset_struct.sect_off;
5386 struct partial_symtab *pst;
5389 /* Give the symtab a useful name for debug purposes. */
5390 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5391 name = xstrprintf ("<type_units_%d>",
5392 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5394 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5396 pst = create_partial_symtab (per_cu, name);
5402 tu_group->hash.dwo_unit = cu->dwo_unit;
5403 tu_group->hash.line_offset = line_offset_struct;
5408 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5409 STMT_LIST is a DW_AT_stmt_list attribute. */
5411 static struct type_unit_group *
5412 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5414 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5415 struct type_unit_group *tu_group;
5417 unsigned int line_offset;
5418 struct type_unit_group type_unit_group_for_lookup;
5420 if (dwarf2_per_objfile->type_unit_groups == NULL)
5422 dwarf2_per_objfile->type_unit_groups =
5423 allocate_type_unit_groups_table ();
5426 /* Do we need to create a new group, or can we use an existing one? */
5430 line_offset = DW_UNSND (stmt_list);
5431 ++tu_stats->nr_symtab_sharers;
5435 /* Ugh, no stmt_list. Rare, but we have to handle it.
5436 We can do various things here like create one group per TU or
5437 spread them over multiple groups to split up the expansion work.
5438 To avoid worst case scenarios (too many groups or too large groups)
5439 we, umm, group them in bunches. */
5440 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5441 | (tu_stats->nr_stmt_less_type_units
5442 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5443 ++tu_stats->nr_stmt_less_type_units;
5446 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5447 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5448 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5449 &type_unit_group_for_lookup, INSERT);
5453 gdb_assert (tu_group != NULL);
5457 sect_offset line_offset_struct;
5459 line_offset_struct.sect_off = line_offset;
5460 tu_group = create_type_unit_group (cu, line_offset_struct);
5462 ++tu_stats->nr_symtabs;
5468 /* Struct used to sort TUs by their abbreviation table offset. */
5470 struct tu_abbrev_offset
5472 struct signatured_type *sig_type;
5473 sect_offset abbrev_offset;
5476 /* Helper routine for build_type_unit_groups, passed to qsort. */
5479 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5481 const struct tu_abbrev_offset * const *a = ap;
5482 const struct tu_abbrev_offset * const *b = bp;
5483 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5484 unsigned int boff = (*b)->abbrev_offset.sect_off;
5486 return (aoff > boff) - (aoff < boff);
5489 /* A helper function to add a type_unit_group to a table. */
5492 add_type_unit_group_to_table (void **slot, void *datum)
5494 struct type_unit_group *tu_group = *slot;
5495 struct type_unit_group ***datap = datum;
5503 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5504 each one passing FUNC,DATA.
5506 The efficiency is because we sort TUs by the abbrev table they use and
5507 only read each abbrev table once. In one program there are 200K TUs
5508 sharing 8K abbrev tables.
5510 The main purpose of this function is to support building the
5511 dwarf2_per_objfile->type_unit_groups table.
5512 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5513 can collapse the search space by grouping them by stmt_list.
5514 The savings can be significant, in the same program from above the 200K TUs
5515 share 8K stmt_list tables.
5517 FUNC is expected to call get_type_unit_group, which will create the
5518 struct type_unit_group if necessary and add it to
5519 dwarf2_per_objfile->type_unit_groups. */
5522 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5524 struct objfile *objfile = dwarf2_per_objfile->objfile;
5525 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5526 struct cleanup *cleanups;
5527 struct abbrev_table *abbrev_table;
5528 sect_offset abbrev_offset;
5529 struct tu_abbrev_offset *sorted_by_abbrev;
5530 struct type_unit_group **iter;
5533 /* It's up to the caller to not call us multiple times. */
5534 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5536 if (dwarf2_per_objfile->n_type_units == 0)
5539 /* TUs typically share abbrev tables, and there can be way more TUs than
5540 abbrev tables. Sort by abbrev table to reduce the number of times we
5541 read each abbrev table in.
5542 Alternatives are to punt or to maintain a cache of abbrev tables.
5543 This is simpler and efficient enough for now.
5545 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5546 symtab to use). Typically TUs with the same abbrev offset have the same
5547 stmt_list value too so in practice this should work well.
5549 The basic algorithm here is:
5551 sort TUs by abbrev table
5552 for each TU with same abbrev table:
5553 read abbrev table if first user
5554 read TU top level DIE
5555 [IWBN if DWO skeletons had DW_AT_stmt_list]
5558 if (dwarf2_read_debug)
5559 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5561 /* Sort in a separate table to maintain the order of all_type_units
5562 for .gdb_index: TU indices directly index all_type_units. */
5563 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5564 dwarf2_per_objfile->n_type_units);
5565 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5567 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5569 sorted_by_abbrev[i].sig_type = sig_type;
5570 sorted_by_abbrev[i].abbrev_offset =
5571 read_abbrev_offset (sig_type->per_cu.section,
5572 sig_type->per_cu.offset);
5574 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5575 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5576 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5578 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5579 called any number of times, so we don't reset tu_stats here. */
5581 abbrev_offset.sect_off = ~(unsigned) 0;
5582 abbrev_table = NULL;
5583 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5585 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5587 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5589 /* Switch to the next abbrev table if necessary. */
5590 if (abbrev_table == NULL
5591 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5593 if (abbrev_table != NULL)
5595 abbrev_table_free (abbrev_table);
5596 /* Reset to NULL in case abbrev_table_read_table throws
5597 an error: abbrev_table_free_cleanup will get called. */
5598 abbrev_table = NULL;
5600 abbrev_offset = tu->abbrev_offset;
5602 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5604 ++tu_stats->nr_uniq_abbrev_tables;
5607 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5611 /* type_unit_groups can be NULL if there is an error in the debug info.
5612 Just create an empty table so the rest of gdb doesn't have to watch
5613 for this error case. */
5614 if (dwarf2_per_objfile->type_unit_groups == NULL)
5616 dwarf2_per_objfile->type_unit_groups =
5617 allocate_type_unit_groups_table ();
5618 dwarf2_per_objfile->n_type_unit_groups = 0;
5621 /* Create a vector of pointers to primary type units to make it easy to
5622 iterate over them and CUs. See dw2_get_primary_cu. */
5623 dwarf2_per_objfile->n_type_unit_groups =
5624 htab_elements (dwarf2_per_objfile->type_unit_groups);
5625 dwarf2_per_objfile->all_type_unit_groups =
5626 obstack_alloc (&objfile->objfile_obstack,
5627 dwarf2_per_objfile->n_type_unit_groups
5628 * sizeof (struct type_unit_group *));
5629 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5630 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5631 add_type_unit_group_to_table, &iter);
5632 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5633 == dwarf2_per_objfile->n_type_unit_groups);
5635 do_cleanups (cleanups);
5637 if (dwarf2_read_debug)
5639 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5640 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5641 dwarf2_per_objfile->n_type_units);
5642 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5643 tu_stats->nr_uniq_abbrev_tables);
5644 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5645 tu_stats->nr_symtabs);
5646 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5647 tu_stats->nr_symtab_sharers);
5648 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5649 tu_stats->nr_stmt_less_type_units);
5653 /* Partial symbol tables. */
5655 /* Create a psymtab named NAME and assign it to PER_CU.
5657 The caller must fill in the following details:
5658 dirname, textlow, texthigh. */
5660 static struct partial_symtab *
5661 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5663 struct objfile *objfile = per_cu->objfile;
5664 struct partial_symtab *pst;
5666 pst = start_psymtab_common (objfile, objfile->section_offsets,
5668 objfile->global_psymbols.next,
5669 objfile->static_psymbols.next);
5671 pst->psymtabs_addrmap_supported = 1;
5673 /* This is the glue that links PST into GDB's symbol API. */
5674 pst->read_symtab_private = per_cu;
5675 pst->read_symtab = dwarf2_read_symtab;
5676 per_cu->v.psymtab = pst;
5681 /* die_reader_func for process_psymtab_comp_unit. */
5684 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5685 const gdb_byte *info_ptr,
5686 struct die_info *comp_unit_die,
5690 struct dwarf2_cu *cu = reader->cu;
5691 struct objfile *objfile = cu->objfile;
5692 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5693 struct attribute *attr;
5695 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5696 struct partial_symtab *pst;
5698 const char *filename;
5699 int *want_partial_unit_ptr = data;
5701 if (comp_unit_die->tag == DW_TAG_partial_unit
5702 && (want_partial_unit_ptr == NULL
5703 || !*want_partial_unit_ptr))
5706 gdb_assert (! per_cu->is_debug_types);
5708 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5710 cu->list_in_scope = &file_symbols;
5712 /* Allocate a new partial symbol table structure. */
5713 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5714 if (attr == NULL || !DW_STRING (attr))
5717 filename = DW_STRING (attr);
5719 pst = create_partial_symtab (per_cu, filename);
5721 /* This must be done before calling dwarf2_build_include_psymtabs. */
5722 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5724 pst->dirname = DW_STRING (attr);
5726 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5728 dwarf2_find_base_address (comp_unit_die, cu);
5730 /* Possibly set the default values of LOWPC and HIGHPC from
5732 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5733 &best_highpc, cu, pst);
5734 if (has_pc_info == 1 && best_lowpc < best_highpc)
5735 /* Store the contiguous range if it is not empty; it can be empty for
5736 CUs with no code. */
5737 addrmap_set_empty (objfile->psymtabs_addrmap,
5738 best_lowpc + baseaddr,
5739 best_highpc + baseaddr - 1, pst);
5741 /* Check if comp unit has_children.
5742 If so, read the rest of the partial symbols from this comp unit.
5743 If not, there's no more debug_info for this comp unit. */
5746 struct partial_die_info *first_die;
5747 CORE_ADDR lowpc, highpc;
5749 lowpc = ((CORE_ADDR) -1);
5750 highpc = ((CORE_ADDR) 0);
5752 first_die = load_partial_dies (reader, info_ptr, 1);
5754 scan_partial_symbols (first_die, &lowpc, &highpc,
5757 /* If we didn't find a lowpc, set it to highpc to avoid
5758 complaints from `maint check'. */
5759 if (lowpc == ((CORE_ADDR) -1))
5762 /* If the compilation unit didn't have an explicit address range,
5763 then use the information extracted from its child dies. */
5767 best_highpc = highpc;
5770 pst->textlow = best_lowpc + baseaddr;
5771 pst->texthigh = best_highpc + baseaddr;
5773 pst->n_global_syms = objfile->global_psymbols.next -
5774 (objfile->global_psymbols.list + pst->globals_offset);
5775 pst->n_static_syms = objfile->static_psymbols.next -
5776 (objfile->static_psymbols.list + pst->statics_offset);
5777 sort_pst_symbols (objfile, pst);
5779 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5782 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5783 struct dwarf2_per_cu_data *iter;
5785 /* Fill in 'dependencies' here; we fill in 'users' in a
5787 pst->number_of_dependencies = len;
5788 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5789 len * sizeof (struct symtab *));
5791 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5794 pst->dependencies[i] = iter->v.psymtab;
5796 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5799 /* Get the list of files included in the current compilation unit,
5800 and build a psymtab for each of them. */
5801 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5803 if (dwarf2_read_debug)
5805 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5807 fprintf_unfiltered (gdb_stdlog,
5808 "Psymtab for %s unit @0x%x: %s - %s"
5809 ", %d global, %d static syms\n",
5810 per_cu->is_debug_types ? "type" : "comp",
5811 per_cu->offset.sect_off,
5812 paddress (gdbarch, pst->textlow),
5813 paddress (gdbarch, pst->texthigh),
5814 pst->n_global_syms, pst->n_static_syms);
5818 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5819 Process compilation unit THIS_CU for a psymtab. */
5822 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5823 int want_partial_unit)
5825 /* If this compilation unit was already read in, free the
5826 cached copy in order to read it in again. This is
5827 necessary because we skipped some symbols when we first
5828 read in the compilation unit (see load_partial_dies).
5829 This problem could be avoided, but the benefit is unclear. */
5830 if (this_cu->cu != NULL)
5831 free_one_cached_comp_unit (this_cu);
5833 gdb_assert (! this_cu->is_debug_types);
5834 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5835 process_psymtab_comp_unit_reader,
5836 &want_partial_unit);
5838 /* Age out any secondary CUs. */
5839 age_cached_comp_units ();
5842 /* Reader function for build_type_psymtabs. */
5845 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5846 const gdb_byte *info_ptr,
5847 struct die_info *type_unit_die,
5851 struct objfile *objfile = dwarf2_per_objfile->objfile;
5852 struct dwarf2_cu *cu = reader->cu;
5853 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5854 struct signatured_type *sig_type;
5855 struct type_unit_group *tu_group;
5856 struct attribute *attr;
5857 struct partial_die_info *first_die;
5858 CORE_ADDR lowpc, highpc;
5859 struct partial_symtab *pst;
5861 gdb_assert (data == NULL);
5862 gdb_assert (per_cu->is_debug_types);
5863 sig_type = (struct signatured_type *) per_cu;
5868 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5869 tu_group = get_type_unit_group (cu, attr);
5871 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5873 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5874 cu->list_in_scope = &file_symbols;
5875 pst = create_partial_symtab (per_cu, "");
5878 first_die = load_partial_dies (reader, info_ptr, 1);
5880 lowpc = (CORE_ADDR) -1;
5881 highpc = (CORE_ADDR) 0;
5882 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5884 pst->n_global_syms = objfile->global_psymbols.next -
5885 (objfile->global_psymbols.list + pst->globals_offset);
5886 pst->n_static_syms = objfile->static_psymbols.next -
5887 (objfile->static_psymbols.list + pst->statics_offset);
5888 sort_pst_symbols (objfile, pst);
5891 /* Traversal function for build_type_psymtabs. */
5894 build_type_psymtab_dependencies (void **slot, void *info)
5896 struct objfile *objfile = dwarf2_per_objfile->objfile;
5897 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5898 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5899 struct partial_symtab *pst = per_cu->v.psymtab;
5900 int len = VEC_length (sig_type_ptr, tu_group->tus);
5901 struct signatured_type *iter;
5904 gdb_assert (len > 0);
5905 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5907 pst->number_of_dependencies = len;
5908 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5909 len * sizeof (struct psymtab *));
5911 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5914 gdb_assert (iter->per_cu.is_debug_types);
5915 pst->dependencies[i] = iter->per_cu.v.psymtab;
5916 iter->type_unit_group = tu_group;
5919 VEC_free (sig_type_ptr, tu_group->tus);
5924 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5925 Build partial symbol tables for the .debug_types comp-units. */
5928 build_type_psymtabs (struct objfile *objfile)
5930 if (! create_all_type_units (objfile))
5933 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5935 /* Now that all TUs have been processed we can fill in the dependencies. */
5936 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5937 build_type_psymtab_dependencies, NULL);
5940 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5943 psymtabs_addrmap_cleanup (void *o)
5945 struct objfile *objfile = o;
5947 objfile->psymtabs_addrmap = NULL;
5950 /* Compute the 'user' field for each psymtab in OBJFILE. */
5953 set_partial_user (struct objfile *objfile)
5957 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5959 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5960 struct partial_symtab *pst = per_cu->v.psymtab;
5966 for (j = 0; j < pst->number_of_dependencies; ++j)
5968 /* Set the 'user' field only if it is not already set. */
5969 if (pst->dependencies[j]->user == NULL)
5970 pst->dependencies[j]->user = pst;
5975 /* Build the partial symbol table by doing a quick pass through the
5976 .debug_info and .debug_abbrev sections. */
5979 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5981 struct cleanup *back_to, *addrmap_cleanup;
5982 struct obstack temp_obstack;
5985 if (dwarf2_read_debug)
5987 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5991 dwarf2_per_objfile->reading_partial_symbols = 1;
5993 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5995 /* Any cached compilation units will be linked by the per-objfile
5996 read_in_chain. Make sure to free them when we're done. */
5997 back_to = make_cleanup (free_cached_comp_units, NULL);
5999 build_type_psymtabs (objfile);
6001 create_all_comp_units (objfile);
6003 /* Create a temporary address map on a temporary obstack. We later
6004 copy this to the final obstack. */
6005 obstack_init (&temp_obstack);
6006 make_cleanup_obstack_free (&temp_obstack);
6007 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6008 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6010 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6012 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6014 process_psymtab_comp_unit (per_cu, 0);
6017 set_partial_user (objfile);
6019 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6020 &objfile->objfile_obstack);
6021 discard_cleanups (addrmap_cleanup);
6023 do_cleanups (back_to);
6025 if (dwarf2_read_debug)
6026 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6030 /* die_reader_func for load_partial_comp_unit. */
6033 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6034 const gdb_byte *info_ptr,
6035 struct die_info *comp_unit_die,
6039 struct dwarf2_cu *cu = reader->cu;
6041 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6043 /* Check if comp unit has_children.
6044 If so, read the rest of the partial symbols from this comp unit.
6045 If not, there's no more debug_info for this comp unit. */
6047 load_partial_dies (reader, info_ptr, 0);
6050 /* Load the partial DIEs for a secondary CU into memory.
6051 This is also used when rereading a primary CU with load_all_dies. */
6054 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6056 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6057 load_partial_comp_unit_reader, NULL);
6061 read_comp_units_from_section (struct objfile *objfile,
6062 struct dwarf2_section_info *section,
6063 unsigned int is_dwz,
6066 struct dwarf2_per_cu_data ***all_comp_units)
6068 const gdb_byte *info_ptr;
6069 bfd *abfd = section->asection->owner;
6071 if (dwarf2_read_debug)
6072 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6073 section->asection->name, bfd_get_filename (abfd));
6075 dwarf2_read_section (objfile, section);
6077 info_ptr = section->buffer;
6079 while (info_ptr < section->buffer + section->size)
6081 unsigned int length, initial_length_size;
6082 struct dwarf2_per_cu_data *this_cu;
6085 offset.sect_off = info_ptr - section->buffer;
6087 /* Read just enough information to find out where the next
6088 compilation unit is. */
6089 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6091 /* Save the compilation unit for later lookup. */
6092 this_cu = obstack_alloc (&objfile->objfile_obstack,
6093 sizeof (struct dwarf2_per_cu_data));
6094 memset (this_cu, 0, sizeof (*this_cu));
6095 this_cu->offset = offset;
6096 this_cu->length = length + initial_length_size;
6097 this_cu->is_dwz = is_dwz;
6098 this_cu->objfile = objfile;
6099 this_cu->section = section;
6101 if (*n_comp_units == *n_allocated)
6104 *all_comp_units = xrealloc (*all_comp_units,
6106 * sizeof (struct dwarf2_per_cu_data *));
6108 (*all_comp_units)[*n_comp_units] = this_cu;
6111 info_ptr = info_ptr + this_cu->length;
6115 /* Create a list of all compilation units in OBJFILE.
6116 This is only done for -readnow and building partial symtabs. */
6119 create_all_comp_units (struct objfile *objfile)
6123 struct dwarf2_per_cu_data **all_comp_units;
6127 all_comp_units = xmalloc (n_allocated
6128 * sizeof (struct dwarf2_per_cu_data *));
6130 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6131 &n_allocated, &n_comp_units, &all_comp_units);
6133 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
6135 struct dwz_file *dwz = dwarf2_get_dwz_file ();
6137 read_comp_units_from_section (objfile, &dwz->info, 1,
6138 &n_allocated, &n_comp_units,
6142 dwarf2_per_objfile->all_comp_units
6143 = obstack_alloc (&objfile->objfile_obstack,
6144 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6145 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6146 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6147 xfree (all_comp_units);
6148 dwarf2_per_objfile->n_comp_units = n_comp_units;
6151 /* Process all loaded DIEs for compilation unit CU, starting at
6152 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6153 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6154 DW_AT_ranges). If NEED_PC is set, then this function will set
6155 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6156 and record the covered ranges in the addrmap. */
6159 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6160 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6162 struct partial_die_info *pdi;
6164 /* Now, march along the PDI's, descending into ones which have
6165 interesting children but skipping the children of the other ones,
6166 until we reach the end of the compilation unit. */
6172 fixup_partial_die (pdi, cu);
6174 /* Anonymous namespaces or modules have no name but have interesting
6175 children, so we need to look at them. Ditto for anonymous
6178 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6179 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6180 || pdi->tag == DW_TAG_imported_unit)
6184 case DW_TAG_subprogram:
6185 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6187 case DW_TAG_constant:
6188 case DW_TAG_variable:
6189 case DW_TAG_typedef:
6190 case DW_TAG_union_type:
6191 if (!pdi->is_declaration)
6193 add_partial_symbol (pdi, cu);
6196 case DW_TAG_class_type:
6197 case DW_TAG_interface_type:
6198 case DW_TAG_structure_type:
6199 if (!pdi->is_declaration)
6201 add_partial_symbol (pdi, cu);
6204 case DW_TAG_enumeration_type:
6205 if (!pdi->is_declaration)
6206 add_partial_enumeration (pdi, cu);
6208 case DW_TAG_base_type:
6209 case DW_TAG_subrange_type:
6210 /* File scope base type definitions are added to the partial
6212 add_partial_symbol (pdi, cu);
6214 case DW_TAG_namespace:
6215 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6218 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6220 case DW_TAG_imported_unit:
6222 struct dwarf2_per_cu_data *per_cu;
6224 /* For now we don't handle imported units in type units. */
6225 if (cu->per_cu->is_debug_types)
6227 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6228 " supported in type units [in module %s]"),
6232 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6236 /* Go read the partial unit, if needed. */
6237 if (per_cu->v.psymtab == NULL)
6238 process_psymtab_comp_unit (per_cu, 1);
6240 VEC_safe_push (dwarf2_per_cu_ptr,
6241 cu->per_cu->imported_symtabs, per_cu);
6249 /* If the die has a sibling, skip to the sibling. */
6251 pdi = pdi->die_sibling;
6255 /* Functions used to compute the fully scoped name of a partial DIE.
6257 Normally, this is simple. For C++, the parent DIE's fully scoped
6258 name is concatenated with "::" and the partial DIE's name. For
6259 Java, the same thing occurs except that "." is used instead of "::".
6260 Enumerators are an exception; they use the scope of their parent
6261 enumeration type, i.e. the name of the enumeration type is not
6262 prepended to the enumerator.
6264 There are two complexities. One is DW_AT_specification; in this
6265 case "parent" means the parent of the target of the specification,
6266 instead of the direct parent of the DIE. The other is compilers
6267 which do not emit DW_TAG_namespace; in this case we try to guess
6268 the fully qualified name of structure types from their members'
6269 linkage names. This must be done using the DIE's children rather
6270 than the children of any DW_AT_specification target. We only need
6271 to do this for structures at the top level, i.e. if the target of
6272 any DW_AT_specification (if any; otherwise the DIE itself) does not
6275 /* Compute the scope prefix associated with PDI's parent, in
6276 compilation unit CU. The result will be allocated on CU's
6277 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6278 field. NULL is returned if no prefix is necessary. */
6280 partial_die_parent_scope (struct partial_die_info *pdi,
6281 struct dwarf2_cu *cu)
6283 const char *grandparent_scope;
6284 struct partial_die_info *parent, *real_pdi;
6286 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6287 then this means the parent of the specification DIE. */
6290 while (real_pdi->has_specification)
6291 real_pdi = find_partial_die (real_pdi->spec_offset,
6292 real_pdi->spec_is_dwz, cu);
6294 parent = real_pdi->die_parent;
6298 if (parent->scope_set)
6299 return parent->scope;
6301 fixup_partial_die (parent, cu);
6303 grandparent_scope = partial_die_parent_scope (parent, cu);
6305 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6306 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6307 Work around this problem here. */
6308 if (cu->language == language_cplus
6309 && parent->tag == DW_TAG_namespace
6310 && strcmp (parent->name, "::") == 0
6311 && grandparent_scope == NULL)
6313 parent->scope = NULL;
6314 parent->scope_set = 1;
6318 if (pdi->tag == DW_TAG_enumerator)
6319 /* Enumerators should not get the name of the enumeration as a prefix. */
6320 parent->scope = grandparent_scope;
6321 else if (parent->tag == DW_TAG_namespace
6322 || parent->tag == DW_TAG_module
6323 || parent->tag == DW_TAG_structure_type
6324 || parent->tag == DW_TAG_class_type
6325 || parent->tag == DW_TAG_interface_type
6326 || parent->tag == DW_TAG_union_type
6327 || parent->tag == DW_TAG_enumeration_type)
6329 if (grandparent_scope == NULL)
6330 parent->scope = parent->name;
6332 parent->scope = typename_concat (&cu->comp_unit_obstack,
6334 parent->name, 0, cu);
6338 /* FIXME drow/2004-04-01: What should we be doing with
6339 function-local names? For partial symbols, we should probably be
6341 complaint (&symfile_complaints,
6342 _("unhandled containing DIE tag %d for DIE at %d"),
6343 parent->tag, pdi->offset.sect_off);
6344 parent->scope = grandparent_scope;
6347 parent->scope_set = 1;
6348 return parent->scope;
6351 /* Return the fully scoped name associated with PDI, from compilation unit
6352 CU. The result will be allocated with malloc. */
6355 partial_die_full_name (struct partial_die_info *pdi,
6356 struct dwarf2_cu *cu)
6358 const char *parent_scope;
6360 /* If this is a template instantiation, we can not work out the
6361 template arguments from partial DIEs. So, unfortunately, we have
6362 to go through the full DIEs. At least any work we do building
6363 types here will be reused if full symbols are loaded later. */
6364 if (pdi->has_template_arguments)
6366 fixup_partial_die (pdi, cu);
6368 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6370 struct die_info *die;
6371 struct attribute attr;
6372 struct dwarf2_cu *ref_cu = cu;
6374 /* DW_FORM_ref_addr is using section offset. */
6376 attr.form = DW_FORM_ref_addr;
6377 attr.u.unsnd = pdi->offset.sect_off;
6378 die = follow_die_ref (NULL, &attr, &ref_cu);
6380 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6384 parent_scope = partial_die_parent_scope (pdi, cu);
6385 if (parent_scope == NULL)
6388 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6392 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6394 struct objfile *objfile = cu->objfile;
6396 const char *actual_name = NULL;
6398 char *built_actual_name;
6400 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6402 built_actual_name = partial_die_full_name (pdi, cu);
6403 if (built_actual_name != NULL)
6404 actual_name = built_actual_name;
6406 if (actual_name == NULL)
6407 actual_name = pdi->name;
6411 case DW_TAG_subprogram:
6412 if (pdi->is_external || cu->language == language_ada)
6414 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6415 of the global scope. But in Ada, we want to be able to access
6416 nested procedures globally. So all Ada subprograms are stored
6417 in the global scope. */
6418 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6419 mst_text, objfile); */
6420 add_psymbol_to_list (actual_name, strlen (actual_name),
6421 built_actual_name != NULL,
6422 VAR_DOMAIN, LOC_BLOCK,
6423 &objfile->global_psymbols,
6424 0, pdi->lowpc + baseaddr,
6425 cu->language, objfile);
6429 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6430 mst_file_text, objfile); */
6431 add_psymbol_to_list (actual_name, strlen (actual_name),
6432 built_actual_name != NULL,
6433 VAR_DOMAIN, LOC_BLOCK,
6434 &objfile->static_psymbols,
6435 0, pdi->lowpc + baseaddr,
6436 cu->language, objfile);
6439 case DW_TAG_constant:
6441 struct psymbol_allocation_list *list;
6443 if (pdi->is_external)
6444 list = &objfile->global_psymbols;
6446 list = &objfile->static_psymbols;
6447 add_psymbol_to_list (actual_name, strlen (actual_name),
6448 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6449 list, 0, 0, cu->language, objfile);
6452 case DW_TAG_variable:
6454 addr = decode_locdesc (pdi->d.locdesc, cu);
6458 && !dwarf2_per_objfile->has_section_at_zero)
6460 /* A global or static variable may also have been stripped
6461 out by the linker if unused, in which case its address
6462 will be nullified; do not add such variables into partial
6463 symbol table then. */
6465 else if (pdi->is_external)
6468 Don't enter into the minimal symbol tables as there is
6469 a minimal symbol table entry from the ELF symbols already.
6470 Enter into partial symbol table if it has a location
6471 descriptor or a type.
6472 If the location descriptor is missing, new_symbol will create
6473 a LOC_UNRESOLVED symbol, the address of the variable will then
6474 be determined from the minimal symbol table whenever the variable
6476 The address for the partial symbol table entry is not
6477 used by GDB, but it comes in handy for debugging partial symbol
6480 if (pdi->d.locdesc || pdi->has_type)
6481 add_psymbol_to_list (actual_name, strlen (actual_name),
6482 built_actual_name != NULL,
6483 VAR_DOMAIN, LOC_STATIC,
6484 &objfile->global_psymbols,
6486 cu->language, objfile);
6490 /* Static Variable. Skip symbols without location descriptors. */
6491 if (pdi->d.locdesc == NULL)
6493 xfree (built_actual_name);
6496 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6497 mst_file_data, objfile); */
6498 add_psymbol_to_list (actual_name, strlen (actual_name),
6499 built_actual_name != NULL,
6500 VAR_DOMAIN, LOC_STATIC,
6501 &objfile->static_psymbols,
6503 cu->language, objfile);
6506 case DW_TAG_typedef:
6507 case DW_TAG_base_type:
6508 case DW_TAG_subrange_type:
6509 add_psymbol_to_list (actual_name, strlen (actual_name),
6510 built_actual_name != NULL,
6511 VAR_DOMAIN, LOC_TYPEDEF,
6512 &objfile->static_psymbols,
6513 0, (CORE_ADDR) 0, cu->language, objfile);
6515 case DW_TAG_namespace:
6516 add_psymbol_to_list (actual_name, strlen (actual_name),
6517 built_actual_name != NULL,
6518 VAR_DOMAIN, LOC_TYPEDEF,
6519 &objfile->global_psymbols,
6520 0, (CORE_ADDR) 0, cu->language, objfile);
6522 case DW_TAG_class_type:
6523 case DW_TAG_interface_type:
6524 case DW_TAG_structure_type:
6525 case DW_TAG_union_type:
6526 case DW_TAG_enumeration_type:
6527 /* Skip external references. The DWARF standard says in the section
6528 about "Structure, Union, and Class Type Entries": "An incomplete
6529 structure, union or class type is represented by a structure,
6530 union or class entry that does not have a byte size attribute
6531 and that has a DW_AT_declaration attribute." */
6532 if (!pdi->has_byte_size && pdi->is_declaration)
6534 xfree (built_actual_name);
6538 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6539 static vs. global. */
6540 add_psymbol_to_list (actual_name, strlen (actual_name),
6541 built_actual_name != NULL,
6542 STRUCT_DOMAIN, LOC_TYPEDEF,
6543 (cu->language == language_cplus
6544 || cu->language == language_java)
6545 ? &objfile->global_psymbols
6546 : &objfile->static_psymbols,
6547 0, (CORE_ADDR) 0, cu->language, objfile);
6550 case DW_TAG_enumerator:
6551 add_psymbol_to_list (actual_name, strlen (actual_name),
6552 built_actual_name != NULL,
6553 VAR_DOMAIN, LOC_CONST,
6554 (cu->language == language_cplus
6555 || cu->language == language_java)
6556 ? &objfile->global_psymbols
6557 : &objfile->static_psymbols,
6558 0, (CORE_ADDR) 0, cu->language, objfile);
6564 xfree (built_actual_name);
6567 /* Read a partial die corresponding to a namespace; also, add a symbol
6568 corresponding to that namespace to the symbol table. NAMESPACE is
6569 the name of the enclosing namespace. */
6572 add_partial_namespace (struct partial_die_info *pdi,
6573 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6574 int need_pc, struct dwarf2_cu *cu)
6576 /* Add a symbol for the namespace. */
6578 add_partial_symbol (pdi, cu);
6580 /* Now scan partial symbols in that namespace. */
6582 if (pdi->has_children)
6583 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6586 /* Read a partial die corresponding to a Fortran module. */
6589 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6590 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6592 /* Now scan partial symbols in that module. */
6594 if (pdi->has_children)
6595 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6598 /* Read a partial die corresponding to a subprogram and create a partial
6599 symbol for that subprogram. When the CU language allows it, this
6600 routine also defines a partial symbol for each nested subprogram
6601 that this subprogram contains.
6603 DIE my also be a lexical block, in which case we simply search
6604 recursively for suprograms defined inside that lexical block.
6605 Again, this is only performed when the CU language allows this
6606 type of definitions. */
6609 add_partial_subprogram (struct partial_die_info *pdi,
6610 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6611 int need_pc, struct dwarf2_cu *cu)
6613 if (pdi->tag == DW_TAG_subprogram)
6615 if (pdi->has_pc_info)
6617 if (pdi->lowpc < *lowpc)
6618 *lowpc = pdi->lowpc;
6619 if (pdi->highpc > *highpc)
6620 *highpc = pdi->highpc;
6624 struct objfile *objfile = cu->objfile;
6626 baseaddr = ANOFFSET (objfile->section_offsets,
6627 SECT_OFF_TEXT (objfile));
6628 addrmap_set_empty (objfile->psymtabs_addrmap,
6629 pdi->lowpc + baseaddr,
6630 pdi->highpc - 1 + baseaddr,
6631 cu->per_cu->v.psymtab);
6635 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6637 if (!pdi->is_declaration)
6638 /* Ignore subprogram DIEs that do not have a name, they are
6639 illegal. Do not emit a complaint at this point, we will
6640 do so when we convert this psymtab into a symtab. */
6642 add_partial_symbol (pdi, cu);
6646 if (! pdi->has_children)
6649 if (cu->language == language_ada)
6651 pdi = pdi->die_child;
6654 fixup_partial_die (pdi, cu);
6655 if (pdi->tag == DW_TAG_subprogram
6656 || pdi->tag == DW_TAG_lexical_block)
6657 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6658 pdi = pdi->die_sibling;
6663 /* Read a partial die corresponding to an enumeration type. */
6666 add_partial_enumeration (struct partial_die_info *enum_pdi,
6667 struct dwarf2_cu *cu)
6669 struct partial_die_info *pdi;
6671 if (enum_pdi->name != NULL)
6672 add_partial_symbol (enum_pdi, cu);
6674 pdi = enum_pdi->die_child;
6677 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6678 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6680 add_partial_symbol (pdi, cu);
6681 pdi = pdi->die_sibling;
6685 /* Return the initial uleb128 in the die at INFO_PTR. */
6688 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6690 unsigned int bytes_read;
6692 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6695 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6696 Return the corresponding abbrev, or NULL if the number is zero (indicating
6697 an empty DIE). In either case *BYTES_READ will be set to the length of
6698 the initial number. */
6700 static struct abbrev_info *
6701 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6702 struct dwarf2_cu *cu)
6704 bfd *abfd = cu->objfile->obfd;
6705 unsigned int abbrev_number;
6706 struct abbrev_info *abbrev;
6708 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6710 if (abbrev_number == 0)
6713 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6716 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6717 abbrev_number, bfd_get_filename (abfd));
6723 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6724 Returns a pointer to the end of a series of DIEs, terminated by an empty
6725 DIE. Any children of the skipped DIEs will also be skipped. */
6727 static const gdb_byte *
6728 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6730 struct dwarf2_cu *cu = reader->cu;
6731 struct abbrev_info *abbrev;
6732 unsigned int bytes_read;
6736 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6738 return info_ptr + bytes_read;
6740 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6744 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6745 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6746 abbrev corresponding to that skipped uleb128 should be passed in
6747 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6750 static const gdb_byte *
6751 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6752 struct abbrev_info *abbrev)
6754 unsigned int bytes_read;
6755 struct attribute attr;
6756 bfd *abfd = reader->abfd;
6757 struct dwarf2_cu *cu = reader->cu;
6758 const gdb_byte *buffer = reader->buffer;
6759 const gdb_byte *buffer_end = reader->buffer_end;
6760 const gdb_byte *start_info_ptr = info_ptr;
6761 unsigned int form, i;
6763 for (i = 0; i < abbrev->num_attrs; i++)
6765 /* The only abbrev we care about is DW_AT_sibling. */
6766 if (abbrev->attrs[i].name == DW_AT_sibling)
6768 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6769 if (attr.form == DW_FORM_ref_addr)
6770 complaint (&symfile_complaints,
6771 _("ignoring absolute DW_AT_sibling"));
6773 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6776 /* If it isn't DW_AT_sibling, skip this attribute. */
6777 form = abbrev->attrs[i].form;
6781 case DW_FORM_ref_addr:
6782 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6783 and later it is offset sized. */
6784 if (cu->header.version == 2)
6785 info_ptr += cu->header.addr_size;
6787 info_ptr += cu->header.offset_size;
6789 case DW_FORM_GNU_ref_alt:
6790 info_ptr += cu->header.offset_size;
6793 info_ptr += cu->header.addr_size;
6800 case DW_FORM_flag_present:
6812 case DW_FORM_ref_sig8:
6815 case DW_FORM_string:
6816 read_direct_string (abfd, info_ptr, &bytes_read);
6817 info_ptr += bytes_read;
6819 case DW_FORM_sec_offset:
6821 case DW_FORM_GNU_strp_alt:
6822 info_ptr += cu->header.offset_size;
6824 case DW_FORM_exprloc:
6826 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6827 info_ptr += bytes_read;
6829 case DW_FORM_block1:
6830 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6832 case DW_FORM_block2:
6833 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6835 case DW_FORM_block4:
6836 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6840 case DW_FORM_ref_udata:
6841 case DW_FORM_GNU_addr_index:
6842 case DW_FORM_GNU_str_index:
6843 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6845 case DW_FORM_indirect:
6846 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6847 info_ptr += bytes_read;
6848 /* We need to continue parsing from here, so just go back to
6850 goto skip_attribute;
6853 error (_("Dwarf Error: Cannot handle %s "
6854 "in DWARF reader [in module %s]"),
6855 dwarf_form_name (form),
6856 bfd_get_filename (abfd));
6860 if (abbrev->has_children)
6861 return skip_children (reader, info_ptr);
6866 /* Locate ORIG_PDI's sibling.
6867 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6869 static const gdb_byte *
6870 locate_pdi_sibling (const struct die_reader_specs *reader,
6871 struct partial_die_info *orig_pdi,
6872 const gdb_byte *info_ptr)
6874 /* Do we know the sibling already? */
6876 if (orig_pdi->sibling)
6877 return orig_pdi->sibling;
6879 /* Are there any children to deal with? */
6881 if (!orig_pdi->has_children)
6884 /* Skip the children the long way. */
6886 return skip_children (reader, info_ptr);
6889 /* Expand this partial symbol table into a full symbol table. SELF is
6893 dwarf2_read_symtab (struct partial_symtab *self,
6894 struct objfile *objfile)
6898 warning (_("bug: psymtab for %s is already read in."),
6905 printf_filtered (_("Reading in symbols for %s..."),
6907 gdb_flush (gdb_stdout);
6910 /* Restore our global data. */
6911 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6913 /* If this psymtab is constructed from a debug-only objfile, the
6914 has_section_at_zero flag will not necessarily be correct. We
6915 can get the correct value for this flag by looking at the data
6916 associated with the (presumably stripped) associated objfile. */
6917 if (objfile->separate_debug_objfile_backlink)
6919 struct dwarf2_per_objfile *dpo_backlink
6920 = objfile_data (objfile->separate_debug_objfile_backlink,
6921 dwarf2_objfile_data_key);
6923 dwarf2_per_objfile->has_section_at_zero
6924 = dpo_backlink->has_section_at_zero;
6927 dwarf2_per_objfile->reading_partial_symbols = 0;
6929 psymtab_to_symtab_1 (self);
6931 /* Finish up the debug error message. */
6933 printf_filtered (_("done.\n"));
6936 process_cu_includes ();
6939 /* Reading in full CUs. */
6941 /* Add PER_CU to the queue. */
6944 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6945 enum language pretend_language)
6947 struct dwarf2_queue_item *item;
6950 item = xmalloc (sizeof (*item));
6951 item->per_cu = per_cu;
6952 item->pretend_language = pretend_language;
6955 if (dwarf2_queue == NULL)
6956 dwarf2_queue = item;
6958 dwarf2_queue_tail->next = item;
6960 dwarf2_queue_tail = item;
6963 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6964 unit and add it to our queue.
6965 The result is non-zero if PER_CU was queued, otherwise the result is zero
6966 meaning either PER_CU is already queued or it is already loaded. */
6969 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6970 struct dwarf2_per_cu_data *per_cu,
6971 enum language pretend_language)
6973 /* We may arrive here during partial symbol reading, if we need full
6974 DIEs to process an unusual case (e.g. template arguments). Do
6975 not queue PER_CU, just tell our caller to load its DIEs. */
6976 if (dwarf2_per_objfile->reading_partial_symbols)
6978 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6983 /* Mark the dependence relation so that we don't flush PER_CU
6985 dwarf2_add_dependence (this_cu, per_cu);
6987 /* If it's already on the queue, we have nothing to do. */
6991 /* If the compilation unit is already loaded, just mark it as
6993 if (per_cu->cu != NULL)
6995 per_cu->cu->last_used = 0;
6999 /* Add it to the queue. */
7000 queue_comp_unit (per_cu, pretend_language);
7005 /* Process the queue. */
7008 process_queue (void)
7010 struct dwarf2_queue_item *item, *next_item;
7012 if (dwarf2_read_debug)
7014 fprintf_unfiltered (gdb_stdlog,
7015 "Expanding one or more symtabs of objfile %s ...\n",
7016 dwarf2_per_objfile->objfile->name);
7019 /* The queue starts out with one item, but following a DIE reference
7020 may load a new CU, adding it to the end of the queue. */
7021 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7023 if (dwarf2_per_objfile->using_index
7024 ? !item->per_cu->v.quick->symtab
7025 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7027 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7029 if (dwarf2_read_debug)
7031 fprintf_unfiltered (gdb_stdlog,
7032 "Expanding symtab of %s at offset 0x%x\n",
7033 per_cu->is_debug_types ? "TU" : "CU",
7034 per_cu->offset.sect_off);
7037 if (per_cu->is_debug_types)
7038 process_full_type_unit (per_cu, item->pretend_language);
7040 process_full_comp_unit (per_cu, item->pretend_language);
7042 if (dwarf2_read_debug)
7044 fprintf_unfiltered (gdb_stdlog,
7045 "Done expanding %s at offset 0x%x\n",
7046 per_cu->is_debug_types ? "TU" : "CU",
7047 per_cu->offset.sect_off);
7051 item->per_cu->queued = 0;
7052 next_item = item->next;
7056 dwarf2_queue_tail = NULL;
7058 if (dwarf2_read_debug)
7060 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7061 dwarf2_per_objfile->objfile->name);
7065 /* Free all allocated queue entries. This function only releases anything if
7066 an error was thrown; if the queue was processed then it would have been
7067 freed as we went along. */
7070 dwarf2_release_queue (void *dummy)
7072 struct dwarf2_queue_item *item, *last;
7074 item = dwarf2_queue;
7077 /* Anything still marked queued is likely to be in an
7078 inconsistent state, so discard it. */
7079 if (item->per_cu->queued)
7081 if (item->per_cu->cu != NULL)
7082 free_one_cached_comp_unit (item->per_cu);
7083 item->per_cu->queued = 0;
7091 dwarf2_queue = dwarf2_queue_tail = NULL;
7094 /* Read in full symbols for PST, and anything it depends on. */
7097 psymtab_to_symtab_1 (struct partial_symtab *pst)
7099 struct dwarf2_per_cu_data *per_cu;
7105 for (i = 0; i < pst->number_of_dependencies; i++)
7106 if (!pst->dependencies[i]->readin
7107 && pst->dependencies[i]->user == NULL)
7109 /* Inform about additional files that need to be read in. */
7112 /* FIXME: i18n: Need to make this a single string. */
7113 fputs_filtered (" ", gdb_stdout);
7115 fputs_filtered ("and ", gdb_stdout);
7117 printf_filtered ("%s...", pst->dependencies[i]->filename);
7118 wrap_here (""); /* Flush output. */
7119 gdb_flush (gdb_stdout);
7121 psymtab_to_symtab_1 (pst->dependencies[i]);
7124 per_cu = pst->read_symtab_private;
7128 /* It's an include file, no symbols to read for it.
7129 Everything is in the parent symtab. */
7134 dw2_do_instantiate_symtab (per_cu);
7137 /* Trivial hash function for die_info: the hash value of a DIE
7138 is its offset in .debug_info for this objfile. */
7141 die_hash (const void *item)
7143 const struct die_info *die = item;
7145 return die->offset.sect_off;
7148 /* Trivial comparison function for die_info structures: two DIEs
7149 are equal if they have the same offset. */
7152 die_eq (const void *item_lhs, const void *item_rhs)
7154 const struct die_info *die_lhs = item_lhs;
7155 const struct die_info *die_rhs = item_rhs;
7157 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7160 /* die_reader_func for load_full_comp_unit.
7161 This is identical to read_signatured_type_reader,
7162 but is kept separate for now. */
7165 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7166 const gdb_byte *info_ptr,
7167 struct die_info *comp_unit_die,
7171 struct dwarf2_cu *cu = reader->cu;
7172 enum language *language_ptr = data;
7174 gdb_assert (cu->die_hash == NULL);
7176 htab_create_alloc_ex (cu->header.length / 12,
7180 &cu->comp_unit_obstack,
7181 hashtab_obstack_allocate,
7182 dummy_obstack_deallocate);
7185 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7186 &info_ptr, comp_unit_die);
7187 cu->dies = comp_unit_die;
7188 /* comp_unit_die is not stored in die_hash, no need. */
7190 /* We try not to read any attributes in this function, because not
7191 all CUs needed for references have been loaded yet, and symbol
7192 table processing isn't initialized. But we have to set the CU language,
7193 or we won't be able to build types correctly.
7194 Similarly, if we do not read the producer, we can not apply
7195 producer-specific interpretation. */
7196 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7199 /* Load the DIEs associated with PER_CU into memory. */
7202 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7203 enum language pretend_language)
7205 gdb_assert (! this_cu->is_debug_types);
7207 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7208 load_full_comp_unit_reader, &pretend_language);
7211 /* Add a DIE to the delayed physname list. */
7214 add_to_method_list (struct type *type, int fnfield_index, int index,
7215 const char *name, struct die_info *die,
7216 struct dwarf2_cu *cu)
7218 struct delayed_method_info mi;
7220 mi.fnfield_index = fnfield_index;
7224 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7227 /* A cleanup for freeing the delayed method list. */
7230 free_delayed_list (void *ptr)
7232 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7233 if (cu->method_list != NULL)
7235 VEC_free (delayed_method_info, cu->method_list);
7236 cu->method_list = NULL;
7240 /* Compute the physnames of any methods on the CU's method list.
7242 The computation of method physnames is delayed in order to avoid the
7243 (bad) condition that one of the method's formal parameters is of an as yet
7247 compute_delayed_physnames (struct dwarf2_cu *cu)
7250 struct delayed_method_info *mi;
7251 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7253 const char *physname;
7254 struct fn_fieldlist *fn_flp
7255 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7256 physname = dwarf2_physname (mi->name, mi->die, cu);
7257 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7261 /* Go objects should be embedded in a DW_TAG_module DIE,
7262 and it's not clear if/how imported objects will appear.
7263 To keep Go support simple until that's worked out,
7264 go back through what we've read and create something usable.
7265 We could do this while processing each DIE, and feels kinda cleaner,
7266 but that way is more invasive.
7267 This is to, for example, allow the user to type "p var" or "b main"
7268 without having to specify the package name, and allow lookups
7269 of module.object to work in contexts that use the expression
7273 fixup_go_packaging (struct dwarf2_cu *cu)
7275 char *package_name = NULL;
7276 struct pending *list;
7279 for (list = global_symbols; list != NULL; list = list->next)
7281 for (i = 0; i < list->nsyms; ++i)
7283 struct symbol *sym = list->symbol[i];
7285 if (SYMBOL_LANGUAGE (sym) == language_go
7286 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7288 char *this_package_name = go_symbol_package_name (sym);
7290 if (this_package_name == NULL)
7292 if (package_name == NULL)
7293 package_name = this_package_name;
7296 if (strcmp (package_name, this_package_name) != 0)
7297 complaint (&symfile_complaints,
7298 _("Symtab %s has objects from two different Go packages: %s and %s"),
7299 (SYMBOL_SYMTAB (sym)
7300 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7301 : cu->objfile->name),
7302 this_package_name, package_name);
7303 xfree (this_package_name);
7309 if (package_name != NULL)
7311 struct objfile *objfile = cu->objfile;
7312 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7314 strlen (package_name));
7315 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7316 saved_package_name, objfile);
7319 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7321 sym = allocate_symbol (objfile);
7322 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7323 SYMBOL_SET_NAMES (sym, saved_package_name,
7324 strlen (saved_package_name), 0, objfile);
7325 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7326 e.g., "main" finds the "main" module and not C's main(). */
7327 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7328 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7329 SYMBOL_TYPE (sym) = type;
7331 add_symbol_to_list (sym, &global_symbols);
7333 xfree (package_name);
7337 /* Return the symtab for PER_CU. This works properly regardless of
7338 whether we're using the index or psymtabs. */
7340 static struct symtab *
7341 get_symtab (struct dwarf2_per_cu_data *per_cu)
7343 return (dwarf2_per_objfile->using_index
7344 ? per_cu->v.quick->symtab
7345 : per_cu->v.psymtab->symtab);
7348 /* A helper function for computing the list of all symbol tables
7349 included by PER_CU. */
7352 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
7353 htab_t all_children,
7354 struct dwarf2_per_cu_data *per_cu)
7358 struct dwarf2_per_cu_data *iter;
7360 slot = htab_find_slot (all_children, per_cu, INSERT);
7363 /* This inclusion and its children have been processed. */
7368 /* Only add a CU if it has a symbol table. */
7369 if (get_symtab (per_cu) != NULL)
7370 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
7373 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7375 recursively_compute_inclusions (result, all_children, iter);
7378 /* Compute the symtab 'includes' fields for the symtab related to
7382 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7384 gdb_assert (! per_cu->is_debug_types);
7386 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7389 struct dwarf2_per_cu_data *iter;
7390 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
7391 htab_t all_children;
7392 struct symtab *symtab = get_symtab (per_cu);
7394 /* If we don't have a symtab, we can just skip this case. */
7398 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7399 NULL, xcalloc, xfree);
7402 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7405 recursively_compute_inclusions (&result_children, all_children, iter);
7407 /* Now we have a transitive closure of all the included CUs, and
7408 for .gdb_index version 7 the included TUs, so we can convert it
7409 to a list of symtabs. */
7410 len = VEC_length (dwarf2_per_cu_ptr, result_children);
7412 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7413 (len + 1) * sizeof (struct symtab *));
7415 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
7417 symtab->includes[ix] = get_symtab (iter);
7418 symtab->includes[len] = NULL;
7420 VEC_free (dwarf2_per_cu_ptr, result_children);
7421 htab_delete (all_children);
7425 /* Compute the 'includes' field for the symtabs of all the CUs we just
7429 process_cu_includes (void)
7432 struct dwarf2_per_cu_data *iter;
7435 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7439 if (! iter->is_debug_types)
7440 compute_symtab_includes (iter);
7443 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7446 /* Generate full symbol information for PER_CU, whose DIEs have
7447 already been loaded into memory. */
7450 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7451 enum language pretend_language)
7453 struct dwarf2_cu *cu = per_cu->cu;
7454 struct objfile *objfile = per_cu->objfile;
7455 CORE_ADDR lowpc, highpc;
7456 struct symtab *symtab;
7457 struct cleanup *back_to, *delayed_list_cleanup;
7459 struct block *static_block;
7461 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7464 back_to = make_cleanup (really_free_pendings, NULL);
7465 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7467 cu->list_in_scope = &file_symbols;
7469 cu->language = pretend_language;
7470 cu->language_defn = language_def (cu->language);
7472 /* Do line number decoding in read_file_scope () */
7473 process_die (cu->dies, cu);
7475 /* For now fudge the Go package. */
7476 if (cu->language == language_go)
7477 fixup_go_packaging (cu);
7479 /* Now that we have processed all the DIEs in the CU, all the types
7480 should be complete, and it should now be safe to compute all of the
7482 compute_delayed_physnames (cu);
7483 do_cleanups (delayed_list_cleanup);
7485 /* Some compilers don't define a DW_AT_high_pc attribute for the
7486 compilation unit. If the DW_AT_high_pc is missing, synthesize
7487 it, by scanning the DIE's below the compilation unit. */
7488 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7491 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7493 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7494 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7495 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7496 addrmap to help ensure it has an accurate map of pc values belonging to
7498 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7500 symtab = end_symtab_from_static_block (static_block, objfile,
7501 SECT_OFF_TEXT (objfile), 0);
7505 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7507 /* Set symtab language to language from DW_AT_language. If the
7508 compilation is from a C file generated by language preprocessors, do
7509 not set the language if it was already deduced by start_subfile. */
7510 if (!(cu->language == language_c && symtab->language != language_c))
7511 symtab->language = cu->language;
7513 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7514 produce DW_AT_location with location lists but it can be possibly
7515 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7516 there were bugs in prologue debug info, fixed later in GCC-4.5
7517 by "unwind info for epilogues" patch (which is not directly related).
7519 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7520 needed, it would be wrong due to missing DW_AT_producer there.
7522 Still one can confuse GDB by using non-standard GCC compilation
7523 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7525 if (cu->has_loclist && gcc_4_minor >= 5)
7526 symtab->locations_valid = 1;
7528 if (gcc_4_minor >= 5)
7529 symtab->epilogue_unwind_valid = 1;
7531 symtab->call_site_htab = cu->call_site_htab;
7534 if (dwarf2_per_objfile->using_index)
7535 per_cu->v.quick->symtab = symtab;
7538 struct partial_symtab *pst = per_cu->v.psymtab;
7539 pst->symtab = symtab;
7543 /* Push it for inclusion processing later. */
7544 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7546 do_cleanups (back_to);
7549 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7550 already been loaded into memory. */
7553 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7554 enum language pretend_language)
7556 struct dwarf2_cu *cu = per_cu->cu;
7557 struct objfile *objfile = per_cu->objfile;
7558 struct symtab *symtab;
7559 struct cleanup *back_to, *delayed_list_cleanup;
7560 struct signatured_type *sig_type;
7562 gdb_assert (per_cu->is_debug_types);
7563 sig_type = (struct signatured_type *) per_cu;
7566 back_to = make_cleanup (really_free_pendings, NULL);
7567 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7569 cu->list_in_scope = &file_symbols;
7571 cu->language = pretend_language;
7572 cu->language_defn = language_def (cu->language);
7574 /* The symbol tables are set up in read_type_unit_scope. */
7575 process_die (cu->dies, cu);
7577 /* For now fudge the Go package. */
7578 if (cu->language == language_go)
7579 fixup_go_packaging (cu);
7581 /* Now that we have processed all the DIEs in the CU, all the types
7582 should be complete, and it should now be safe to compute all of the
7584 compute_delayed_physnames (cu);
7585 do_cleanups (delayed_list_cleanup);
7587 /* TUs share symbol tables.
7588 If this is the first TU to use this symtab, complete the construction
7589 of it with end_expandable_symtab. Otherwise, complete the addition of
7590 this TU's symbols to the existing symtab. */
7591 if (sig_type->type_unit_group->primary_symtab == NULL)
7593 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7594 sig_type->type_unit_group->primary_symtab = symtab;
7598 /* Set symtab language to language from DW_AT_language. If the
7599 compilation is from a C file generated by language preprocessors,
7600 do not set the language if it was already deduced by
7602 if (!(cu->language == language_c && symtab->language != language_c))
7603 symtab->language = cu->language;
7608 augment_type_symtab (objfile,
7609 sig_type->type_unit_group->primary_symtab);
7610 symtab = sig_type->type_unit_group->primary_symtab;
7613 if (dwarf2_per_objfile->using_index)
7614 per_cu->v.quick->symtab = symtab;
7617 struct partial_symtab *pst = per_cu->v.psymtab;
7618 pst->symtab = symtab;
7622 do_cleanups (back_to);
7625 /* Process an imported unit DIE. */
7628 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7630 struct attribute *attr;
7632 /* For now we don't handle imported units in type units. */
7633 if (cu->per_cu->is_debug_types)
7635 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7636 " supported in type units [in module %s]"),
7640 attr = dwarf2_attr (die, DW_AT_import, cu);
7643 struct dwarf2_per_cu_data *per_cu;
7644 struct symtab *imported_symtab;
7648 offset = dwarf2_get_ref_die_offset (attr);
7649 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7650 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7652 /* Queue the unit, if needed. */
7653 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7654 load_full_comp_unit (per_cu, cu->language);
7656 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7661 /* Process a die and its children. */
7664 process_die (struct die_info *die, struct dwarf2_cu *cu)
7668 case DW_TAG_padding:
7670 case DW_TAG_compile_unit:
7671 case DW_TAG_partial_unit:
7672 read_file_scope (die, cu);
7674 case DW_TAG_type_unit:
7675 read_type_unit_scope (die, cu);
7677 case DW_TAG_subprogram:
7678 case DW_TAG_inlined_subroutine:
7679 read_func_scope (die, cu);
7681 case DW_TAG_lexical_block:
7682 case DW_TAG_try_block:
7683 case DW_TAG_catch_block:
7684 read_lexical_block_scope (die, cu);
7686 case DW_TAG_GNU_call_site:
7687 read_call_site_scope (die, cu);
7689 case DW_TAG_class_type:
7690 case DW_TAG_interface_type:
7691 case DW_TAG_structure_type:
7692 case DW_TAG_union_type:
7693 process_structure_scope (die, cu);
7695 case DW_TAG_enumeration_type:
7696 process_enumeration_scope (die, cu);
7699 /* These dies have a type, but processing them does not create
7700 a symbol or recurse to process the children. Therefore we can
7701 read them on-demand through read_type_die. */
7702 case DW_TAG_subroutine_type:
7703 case DW_TAG_set_type:
7704 case DW_TAG_array_type:
7705 case DW_TAG_pointer_type:
7706 case DW_TAG_ptr_to_member_type:
7707 case DW_TAG_reference_type:
7708 case DW_TAG_string_type:
7711 case DW_TAG_base_type:
7712 case DW_TAG_subrange_type:
7713 case DW_TAG_typedef:
7714 /* Add a typedef symbol for the type definition, if it has a
7716 new_symbol (die, read_type_die (die, cu), cu);
7718 case DW_TAG_common_block:
7719 read_common_block (die, cu);
7721 case DW_TAG_common_inclusion:
7723 case DW_TAG_namespace:
7724 cu->processing_has_namespace_info = 1;
7725 read_namespace (die, cu);
7728 cu->processing_has_namespace_info = 1;
7729 read_module (die, cu);
7731 case DW_TAG_imported_declaration:
7732 case DW_TAG_imported_module:
7733 cu->processing_has_namespace_info = 1;
7734 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7735 || cu->language != language_fortran))
7736 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7737 dwarf_tag_name (die->tag));
7738 read_import_statement (die, cu);
7741 case DW_TAG_imported_unit:
7742 process_imported_unit_die (die, cu);
7746 new_symbol (die, NULL, cu);
7751 /* DWARF name computation. */
7753 /* A helper function for dwarf2_compute_name which determines whether DIE
7754 needs to have the name of the scope prepended to the name listed in the
7758 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7760 struct attribute *attr;
7764 case DW_TAG_namespace:
7765 case DW_TAG_typedef:
7766 case DW_TAG_class_type:
7767 case DW_TAG_interface_type:
7768 case DW_TAG_structure_type:
7769 case DW_TAG_union_type:
7770 case DW_TAG_enumeration_type:
7771 case DW_TAG_enumerator:
7772 case DW_TAG_subprogram:
7776 case DW_TAG_variable:
7777 case DW_TAG_constant:
7778 /* We only need to prefix "globally" visible variables. These include
7779 any variable marked with DW_AT_external or any variable that
7780 lives in a namespace. [Variables in anonymous namespaces
7781 require prefixing, but they are not DW_AT_external.] */
7783 if (dwarf2_attr (die, DW_AT_specification, cu))
7785 struct dwarf2_cu *spec_cu = cu;
7787 return die_needs_namespace (die_specification (die, &spec_cu),
7791 attr = dwarf2_attr (die, DW_AT_external, cu);
7792 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7793 && die->parent->tag != DW_TAG_module)
7795 /* A variable in a lexical block of some kind does not need a
7796 namespace, even though in C++ such variables may be external
7797 and have a mangled name. */
7798 if (die->parent->tag == DW_TAG_lexical_block
7799 || die->parent->tag == DW_TAG_try_block
7800 || die->parent->tag == DW_TAG_catch_block
7801 || die->parent->tag == DW_TAG_subprogram)
7810 /* Retrieve the last character from a mem_file. */
7813 do_ui_file_peek_last (void *object, const char *buffer, long length)
7815 char *last_char_p = (char *) object;
7818 *last_char_p = buffer[length - 1];
7821 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7822 compute the physname for the object, which include a method's:
7823 - formal parameters (C++/Java),
7824 - receiver type (Go),
7825 - return type (Java).
7827 The term "physname" is a bit confusing.
7828 For C++, for example, it is the demangled name.
7829 For Go, for example, it's the mangled name.
7831 For Ada, return the DIE's linkage name rather than the fully qualified
7832 name. PHYSNAME is ignored..
7834 The result is allocated on the objfile_obstack and canonicalized. */
7837 dwarf2_compute_name (const char *name,
7838 struct die_info *die, struct dwarf2_cu *cu,
7841 struct objfile *objfile = cu->objfile;
7844 name = dwarf2_name (die, cu);
7846 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7847 compute it by typename_concat inside GDB. */
7848 if (cu->language == language_ada
7849 || (cu->language == language_fortran && physname))
7851 /* For Ada unit, we prefer the linkage name over the name, as
7852 the former contains the exported name, which the user expects
7853 to be able to reference. Ideally, we want the user to be able
7854 to reference this entity using either natural or linkage name,
7855 but we haven't started looking at this enhancement yet. */
7856 struct attribute *attr;
7858 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7860 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7861 if (attr && DW_STRING (attr))
7862 return DW_STRING (attr);
7865 /* These are the only languages we know how to qualify names in. */
7867 && (cu->language == language_cplus || cu->language == language_java
7868 || cu->language == language_fortran))
7870 if (die_needs_namespace (die, cu))
7874 struct ui_file *buf;
7876 prefix = determine_prefix (die, cu);
7877 buf = mem_fileopen ();
7878 if (*prefix != '\0')
7880 char *prefixed_name = typename_concat (NULL, prefix, name,
7883 fputs_unfiltered (prefixed_name, buf);
7884 xfree (prefixed_name);
7887 fputs_unfiltered (name, buf);
7889 /* Template parameters may be specified in the DIE's DW_AT_name, or
7890 as children with DW_TAG_template_type_param or
7891 DW_TAG_value_type_param. If the latter, add them to the name
7892 here. If the name already has template parameters, then
7893 skip this step; some versions of GCC emit both, and
7894 it is more efficient to use the pre-computed name.
7896 Something to keep in mind about this process: it is very
7897 unlikely, or in some cases downright impossible, to produce
7898 something that will match the mangled name of a function.
7899 If the definition of the function has the same debug info,
7900 we should be able to match up with it anyway. But fallbacks
7901 using the minimal symbol, for instance to find a method
7902 implemented in a stripped copy of libstdc++, will not work.
7903 If we do not have debug info for the definition, we will have to
7904 match them up some other way.
7906 When we do name matching there is a related problem with function
7907 templates; two instantiated function templates are allowed to
7908 differ only by their return types, which we do not add here. */
7910 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7912 struct attribute *attr;
7913 struct die_info *child;
7916 die->building_fullname = 1;
7918 for (child = die->child; child != NULL; child = child->sibling)
7922 const gdb_byte *bytes;
7923 struct dwarf2_locexpr_baton *baton;
7926 if (child->tag != DW_TAG_template_type_param
7927 && child->tag != DW_TAG_template_value_param)
7932 fputs_unfiltered ("<", buf);
7936 fputs_unfiltered (", ", buf);
7938 attr = dwarf2_attr (child, DW_AT_type, cu);
7941 complaint (&symfile_complaints,
7942 _("template parameter missing DW_AT_type"));
7943 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7946 type = die_type (child, cu);
7948 if (child->tag == DW_TAG_template_type_param)
7950 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7954 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7957 complaint (&symfile_complaints,
7958 _("template parameter missing "
7959 "DW_AT_const_value"));
7960 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7964 dwarf2_const_value_attr (attr, type, name,
7965 &cu->comp_unit_obstack, cu,
7966 &value, &bytes, &baton);
7968 if (TYPE_NOSIGN (type))
7969 /* GDB prints characters as NUMBER 'CHAR'. If that's
7970 changed, this can use value_print instead. */
7971 c_printchar (value, type, buf);
7974 struct value_print_options opts;
7977 v = dwarf2_evaluate_loc_desc (type, NULL,
7981 else if (bytes != NULL)
7983 v = allocate_value (type);
7984 memcpy (value_contents_writeable (v), bytes,
7985 TYPE_LENGTH (type));
7988 v = value_from_longest (type, value);
7990 /* Specify decimal so that we do not depend on
7992 get_formatted_print_options (&opts, 'd');
7994 value_print (v, buf, &opts);
8000 die->building_fullname = 0;
8004 /* Close the argument list, with a space if necessary
8005 (nested templates). */
8006 char last_char = '\0';
8007 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8008 if (last_char == '>')
8009 fputs_unfiltered (" >", buf);
8011 fputs_unfiltered (">", buf);
8015 /* For Java and C++ methods, append formal parameter type
8016 information, if PHYSNAME. */
8018 if (physname && die->tag == DW_TAG_subprogram
8019 && (cu->language == language_cplus
8020 || cu->language == language_java))
8022 struct type *type = read_type_die (die, cu);
8024 c_type_print_args (type, buf, 1, cu->language,
8025 &type_print_raw_options);
8027 if (cu->language == language_java)
8029 /* For java, we must append the return type to method
8031 if (die->tag == DW_TAG_subprogram)
8032 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8033 0, 0, &type_print_raw_options);
8035 else if (cu->language == language_cplus)
8037 /* Assume that an artificial first parameter is
8038 "this", but do not crash if it is not. RealView
8039 marks unnamed (and thus unused) parameters as
8040 artificial; there is no way to differentiate
8042 if (TYPE_NFIELDS (type) > 0
8043 && TYPE_FIELD_ARTIFICIAL (type, 0)
8044 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8045 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8047 fputs_unfiltered (" const", buf);
8051 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8053 ui_file_delete (buf);
8055 if (cu->language == language_cplus)
8058 = dwarf2_canonicalize_name (name, cu,
8059 &objfile->objfile_obstack);
8070 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8071 If scope qualifiers are appropriate they will be added. The result
8072 will be allocated on the objfile_obstack, or NULL if the DIE does
8073 not have a name. NAME may either be from a previous call to
8074 dwarf2_name or NULL.
8076 The output string will be canonicalized (if C++/Java). */
8079 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8081 return dwarf2_compute_name (name, die, cu, 0);
8084 /* Construct a physname for the given DIE in CU. NAME may either be
8085 from a previous call to dwarf2_name or NULL. The result will be
8086 allocated on the objfile_objstack or NULL if the DIE does not have a
8089 The output string will be canonicalized (if C++/Java). */
8092 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8094 struct objfile *objfile = cu->objfile;
8095 struct attribute *attr;
8096 const char *retval, *mangled = NULL, *canon = NULL;
8097 struct cleanup *back_to;
8100 /* In this case dwarf2_compute_name is just a shortcut not building anything
8102 if (!die_needs_namespace (die, cu))
8103 return dwarf2_compute_name (name, die, cu, 1);
8105 back_to = make_cleanup (null_cleanup, NULL);
8107 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8109 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8111 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8113 if (attr && DW_STRING (attr))
8117 mangled = DW_STRING (attr);
8119 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8120 type. It is easier for GDB users to search for such functions as
8121 `name(params)' than `long name(params)'. In such case the minimal
8122 symbol names do not match the full symbol names but for template
8123 functions there is never a need to look up their definition from their
8124 declaration so the only disadvantage remains the minimal symbol
8125 variant `long name(params)' does not have the proper inferior type.
8128 if (cu->language == language_go)
8130 /* This is a lie, but we already lie to the caller new_symbol_full.
8131 new_symbol_full assumes we return the mangled name.
8132 This just undoes that lie until things are cleaned up. */
8137 demangled = gdb_demangle (mangled,
8138 (DMGL_PARAMS | DMGL_ANSI
8139 | (cu->language == language_java
8140 ? DMGL_JAVA | DMGL_RET_POSTFIX
8145 make_cleanup (xfree, demangled);
8155 if (canon == NULL || check_physname)
8157 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8159 if (canon != NULL && strcmp (physname, canon) != 0)
8161 /* It may not mean a bug in GDB. The compiler could also
8162 compute DW_AT_linkage_name incorrectly. But in such case
8163 GDB would need to be bug-to-bug compatible. */
8165 complaint (&symfile_complaints,
8166 _("Computed physname <%s> does not match demangled <%s> "
8167 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8168 physname, canon, mangled, die->offset.sect_off, objfile->name);
8170 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8171 is available here - over computed PHYSNAME. It is safer
8172 against both buggy GDB and buggy compilers. */
8186 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8188 do_cleanups (back_to);
8192 /* Read the import statement specified by the given die and record it. */
8195 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8197 struct objfile *objfile = cu->objfile;
8198 struct attribute *import_attr;
8199 struct die_info *imported_die, *child_die;
8200 struct dwarf2_cu *imported_cu;
8201 const char *imported_name;
8202 const char *imported_name_prefix;
8203 const char *canonical_name;
8204 const char *import_alias;
8205 const char *imported_declaration = NULL;
8206 const char *import_prefix;
8207 VEC (const_char_ptr) *excludes = NULL;
8208 struct cleanup *cleanups;
8210 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8211 if (import_attr == NULL)
8213 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8214 dwarf_tag_name (die->tag));
8219 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8220 imported_name = dwarf2_name (imported_die, imported_cu);
8221 if (imported_name == NULL)
8223 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8225 The import in the following code:
8239 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8240 <52> DW_AT_decl_file : 1
8241 <53> DW_AT_decl_line : 6
8242 <54> DW_AT_import : <0x75>
8243 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8245 <5b> DW_AT_decl_file : 1
8246 <5c> DW_AT_decl_line : 2
8247 <5d> DW_AT_type : <0x6e>
8249 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8250 <76> DW_AT_byte_size : 4
8251 <77> DW_AT_encoding : 5 (signed)
8253 imports the wrong die ( 0x75 instead of 0x58 ).
8254 This case will be ignored until the gcc bug is fixed. */
8258 /* Figure out the local name after import. */
8259 import_alias = dwarf2_name (die, cu);
8261 /* Figure out where the statement is being imported to. */
8262 import_prefix = determine_prefix (die, cu);
8264 /* Figure out what the scope of the imported die is and prepend it
8265 to the name of the imported die. */
8266 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8268 if (imported_die->tag != DW_TAG_namespace
8269 && imported_die->tag != DW_TAG_module)
8271 imported_declaration = imported_name;
8272 canonical_name = imported_name_prefix;
8274 else if (strlen (imported_name_prefix) > 0)
8275 canonical_name = obconcat (&objfile->objfile_obstack,
8276 imported_name_prefix, "::", imported_name,
8279 canonical_name = imported_name;
8281 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8283 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8284 for (child_die = die->child; child_die && child_die->tag;
8285 child_die = sibling_die (child_die))
8287 /* DWARF-4: A Fortran use statement with a “rename list” may be
8288 represented by an imported module entry with an import attribute
8289 referring to the module and owned entries corresponding to those
8290 entities that are renamed as part of being imported. */
8292 if (child_die->tag != DW_TAG_imported_declaration)
8294 complaint (&symfile_complaints,
8295 _("child DW_TAG_imported_declaration expected "
8296 "- DIE at 0x%x [in module %s]"),
8297 child_die->offset.sect_off, objfile->name);
8301 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8302 if (import_attr == NULL)
8304 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8305 dwarf_tag_name (child_die->tag));
8310 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8312 imported_name = dwarf2_name (imported_die, imported_cu);
8313 if (imported_name == NULL)
8315 complaint (&symfile_complaints,
8316 _("child DW_TAG_imported_declaration has unknown "
8317 "imported name - DIE at 0x%x [in module %s]"),
8318 child_die->offset.sect_off, objfile->name);
8322 VEC_safe_push (const_char_ptr, excludes, imported_name);
8324 process_die (child_die, cu);
8327 cp_add_using_directive (import_prefix,
8330 imported_declaration,
8333 &objfile->objfile_obstack);
8335 do_cleanups (cleanups);
8338 /* Cleanup function for handle_DW_AT_stmt_list. */
8341 free_cu_line_header (void *arg)
8343 struct dwarf2_cu *cu = arg;
8345 free_line_header (cu->line_header);
8346 cu->line_header = NULL;
8349 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8350 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8351 this, it was first present in GCC release 4.3.0. */
8354 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8356 if (!cu->checked_producer)
8357 check_producer (cu);
8359 return cu->producer_is_gcc_lt_4_3;
8363 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8364 const char **name, const char **comp_dir)
8366 struct attribute *attr;
8371 /* Find the filename. Do not use dwarf2_name here, since the filename
8372 is not a source language identifier. */
8373 attr = dwarf2_attr (die, DW_AT_name, cu);
8376 *name = DW_STRING (attr);
8379 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8381 *comp_dir = DW_STRING (attr);
8382 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8383 && IS_ABSOLUTE_PATH (*name))
8385 char *d = ldirname (*name);
8389 make_cleanup (xfree, d);
8391 if (*comp_dir != NULL)
8393 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8394 directory, get rid of it. */
8395 char *cp = strchr (*comp_dir, ':');
8397 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8402 *name = "<unknown>";
8405 /* Handle DW_AT_stmt_list for a compilation unit.
8406 DIE is the DW_TAG_compile_unit die for CU.
8407 COMP_DIR is the compilation directory.
8408 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8411 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8412 const char *comp_dir) /* ARI: editCase function */
8414 struct attribute *attr;
8416 gdb_assert (! cu->per_cu->is_debug_types);
8418 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8421 unsigned int line_offset = DW_UNSND (attr);
8422 struct line_header *line_header
8423 = dwarf_decode_line_header (line_offset, cu);
8427 cu->line_header = line_header;
8428 make_cleanup (free_cu_line_header, cu);
8429 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8434 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8437 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8439 struct objfile *objfile = dwarf2_per_objfile->objfile;
8440 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8441 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8442 CORE_ADDR highpc = ((CORE_ADDR) 0);
8443 struct attribute *attr;
8444 const char *name = NULL;
8445 const char *comp_dir = NULL;
8446 struct die_info *child_die;
8447 bfd *abfd = objfile->obfd;
8450 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8452 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8454 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8455 from finish_block. */
8456 if (lowpc == ((CORE_ADDR) -1))
8461 find_file_and_directory (die, cu, &name, &comp_dir);
8463 prepare_one_comp_unit (cu, die, cu->language);
8465 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8466 standardised yet. As a workaround for the language detection we fall
8467 back to the DW_AT_producer string. */
8468 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8469 cu->language = language_opencl;
8471 /* Similar hack for Go. */
8472 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8473 set_cu_language (DW_LANG_Go, cu);
8475 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8477 /* Decode line number information if present. We do this before
8478 processing child DIEs, so that the line header table is available
8479 for DW_AT_decl_file. */
8480 handle_DW_AT_stmt_list (die, cu, comp_dir);
8482 /* Process all dies in compilation unit. */
8483 if (die->child != NULL)
8485 child_die = die->child;
8486 while (child_die && child_die->tag)
8488 process_die (child_die, cu);
8489 child_die = sibling_die (child_die);
8493 /* Decode macro information, if present. Dwarf 2 macro information
8494 refers to information in the line number info statement program
8495 header, so we can only read it if we've read the header
8497 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8498 if (attr && cu->line_header)
8500 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8501 complaint (&symfile_complaints,
8502 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8504 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8508 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8509 if (attr && cu->line_header)
8511 unsigned int macro_offset = DW_UNSND (attr);
8513 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8517 do_cleanups (back_to);
8520 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8521 Create the set of symtabs used by this TU, or if this TU is sharing
8522 symtabs with another TU and the symtabs have already been created
8523 then restore those symtabs in the line header.
8524 We don't need the pc/line-number mapping for type units. */
8527 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8529 struct objfile *objfile = dwarf2_per_objfile->objfile;
8530 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8531 struct type_unit_group *tu_group;
8533 struct line_header *lh;
8534 struct attribute *attr;
8535 unsigned int i, line_offset;
8536 struct signatured_type *sig_type;
8538 gdb_assert (per_cu->is_debug_types);
8539 sig_type = (struct signatured_type *) per_cu;
8541 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8543 /* If we're using .gdb_index (includes -readnow) then
8544 per_cu->type_unit_group may not have been set up yet. */
8545 if (sig_type->type_unit_group == NULL)
8546 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8547 tu_group = sig_type->type_unit_group;
8549 /* If we've already processed this stmt_list there's no real need to
8550 do it again, we could fake it and just recreate the part we need
8551 (file name,index -> symtab mapping). If data shows this optimization
8552 is useful we can do it then. */
8553 first_time = tu_group->primary_symtab == NULL;
8555 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8560 line_offset = DW_UNSND (attr);
8561 lh = dwarf_decode_line_header (line_offset, cu);
8566 dwarf2_start_symtab (cu, "", NULL, 0);
8569 gdb_assert (tu_group->symtabs == NULL);
8572 /* Note: The primary symtab will get allocated at the end. */
8576 cu->line_header = lh;
8577 make_cleanup (free_cu_line_header, cu);
8581 dwarf2_start_symtab (cu, "", NULL, 0);
8583 tu_group->num_symtabs = lh->num_file_names;
8584 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8586 for (i = 0; i < lh->num_file_names; ++i)
8588 const char *dir = NULL;
8589 struct file_entry *fe = &lh->file_names[i];
8592 dir = lh->include_dirs[fe->dir_index - 1];
8593 dwarf2_start_subfile (fe->name, dir, NULL);
8595 /* Note: We don't have to watch for the main subfile here, type units
8596 don't have DW_AT_name. */
8598 if (current_subfile->symtab == NULL)
8600 /* NOTE: start_subfile will recognize when it's been passed
8601 a file it has already seen. So we can't assume there's a
8602 simple mapping from lh->file_names to subfiles,
8603 lh->file_names may contain dups. */
8604 current_subfile->symtab = allocate_symtab (current_subfile->name,
8608 fe->symtab = current_subfile->symtab;
8609 tu_group->symtabs[i] = fe->symtab;
8616 for (i = 0; i < lh->num_file_names; ++i)
8618 struct file_entry *fe = &lh->file_names[i];
8620 fe->symtab = tu_group->symtabs[i];
8624 /* The main symtab is allocated last. Type units don't have DW_AT_name
8625 so they don't have a "real" (so to speak) symtab anyway.
8626 There is later code that will assign the main symtab to all symbols
8627 that don't have one. We need to handle the case of a symbol with a
8628 missing symtab (DW_AT_decl_file) anyway. */
8631 /* Process DW_TAG_type_unit.
8632 For TUs we want to skip the first top level sibling if it's not the
8633 actual type being defined by this TU. In this case the first top
8634 level sibling is there to provide context only. */
8637 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8639 struct die_info *child_die;
8641 prepare_one_comp_unit (cu, die, language_minimal);
8643 /* Initialize (or reinitialize) the machinery for building symtabs.
8644 We do this before processing child DIEs, so that the line header table
8645 is available for DW_AT_decl_file. */
8646 setup_type_unit_groups (die, cu);
8648 if (die->child != NULL)
8650 child_die = die->child;
8651 while (child_die && child_die->tag)
8653 process_die (child_die, cu);
8654 child_die = sibling_die (child_die);
8661 http://gcc.gnu.org/wiki/DebugFission
8662 http://gcc.gnu.org/wiki/DebugFissionDWP
8664 To simplify handling of both DWO files ("object" files with the DWARF info)
8665 and DWP files (a file with the DWOs packaged up into one file), we treat
8666 DWP files as having a collection of virtual DWO files. */
8669 hash_dwo_file (const void *item)
8671 const struct dwo_file *dwo_file = item;
8674 hash = htab_hash_string (dwo_file->dwo_name);
8675 if (dwo_file->comp_dir != NULL)
8676 hash += htab_hash_string (dwo_file->comp_dir);
8681 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8683 const struct dwo_file *lhs = item_lhs;
8684 const struct dwo_file *rhs = item_rhs;
8686 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
8688 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
8689 return lhs->comp_dir == rhs->comp_dir;
8690 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
8693 /* Allocate a hash table for DWO files. */
8696 allocate_dwo_file_hash_table (void)
8698 struct objfile *objfile = dwarf2_per_objfile->objfile;
8700 return htab_create_alloc_ex (41,
8704 &objfile->objfile_obstack,
8705 hashtab_obstack_allocate,
8706 dummy_obstack_deallocate);
8709 /* Lookup DWO file DWO_NAME. */
8712 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8714 struct dwo_file find_entry;
8717 if (dwarf2_per_objfile->dwo_files == NULL)
8718 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8720 memset (&find_entry, 0, sizeof (find_entry));
8721 find_entry.dwo_name = dwo_name;
8722 find_entry.comp_dir = comp_dir;
8723 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8729 hash_dwo_unit (const void *item)
8731 const struct dwo_unit *dwo_unit = item;
8733 /* This drops the top 32 bits of the id, but is ok for a hash. */
8734 return dwo_unit->signature;
8738 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8740 const struct dwo_unit *lhs = item_lhs;
8741 const struct dwo_unit *rhs = item_rhs;
8743 /* The signature is assumed to be unique within the DWO file.
8744 So while object file CU dwo_id's always have the value zero,
8745 that's OK, assuming each object file DWO file has only one CU,
8746 and that's the rule for now. */
8747 return lhs->signature == rhs->signature;
8750 /* Allocate a hash table for DWO CUs,TUs.
8751 There is one of these tables for each of CUs,TUs for each DWO file. */
8754 allocate_dwo_unit_table (struct objfile *objfile)
8756 /* Start out with a pretty small number.
8757 Generally DWO files contain only one CU and maybe some TUs. */
8758 return htab_create_alloc_ex (3,
8762 &objfile->objfile_obstack,
8763 hashtab_obstack_allocate,
8764 dummy_obstack_deallocate);
8767 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8769 struct create_dwo_cu_data
8771 struct dwo_file *dwo_file;
8772 struct dwo_unit dwo_unit;
8775 /* die_reader_func for create_dwo_cu. */
8778 create_dwo_cu_reader (const struct die_reader_specs *reader,
8779 const gdb_byte *info_ptr,
8780 struct die_info *comp_unit_die,
8784 struct dwarf2_cu *cu = reader->cu;
8785 struct objfile *objfile = dwarf2_per_objfile->objfile;
8786 sect_offset offset = cu->per_cu->offset;
8787 struct dwarf2_section_info *section = cu->per_cu->section;
8788 struct create_dwo_cu_data *data = datap;
8789 struct dwo_file *dwo_file = data->dwo_file;
8790 struct dwo_unit *dwo_unit = &data->dwo_unit;
8791 struct attribute *attr;
8793 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8796 complaint (&symfile_complaints,
8797 _("Dwarf Error: debug entry at offset 0x%x is missing"
8798 " its dwo_id [in module %s]"),
8799 offset.sect_off, dwo_file->dwo_name);
8803 dwo_unit->dwo_file = dwo_file;
8804 dwo_unit->signature = DW_UNSND (attr);
8805 dwo_unit->section = section;
8806 dwo_unit->offset = offset;
8807 dwo_unit->length = cu->per_cu->length;
8809 if (dwarf2_read_debug)
8810 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8811 offset.sect_off, hex_string (dwo_unit->signature));
8814 /* Create the dwo_unit for the lone CU in DWO_FILE.
8815 Note: This function processes DWO files only, not DWP files. */
8817 static struct dwo_unit *
8818 create_dwo_cu (struct dwo_file *dwo_file)
8820 struct objfile *objfile = dwarf2_per_objfile->objfile;
8821 struct dwarf2_section_info *section = &dwo_file->sections.info;
8824 const gdb_byte *info_ptr, *end_ptr;
8825 struct create_dwo_cu_data create_dwo_cu_data;
8826 struct dwo_unit *dwo_unit;
8828 dwarf2_read_section (objfile, section);
8829 info_ptr = section->buffer;
8831 if (info_ptr == NULL)
8834 /* We can't set abfd until now because the section may be empty or
8835 not present, in which case section->asection will be NULL. */
8836 abfd = section->asection->owner;
8838 if (dwarf2_read_debug)
8840 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8841 bfd_section_name (abfd, section->asection),
8842 bfd_get_filename (abfd));
8845 create_dwo_cu_data.dwo_file = dwo_file;
8848 end_ptr = info_ptr + section->size;
8849 while (info_ptr < end_ptr)
8851 struct dwarf2_per_cu_data per_cu;
8853 memset (&create_dwo_cu_data.dwo_unit, 0,
8854 sizeof (create_dwo_cu_data.dwo_unit));
8855 memset (&per_cu, 0, sizeof (per_cu));
8856 per_cu.objfile = objfile;
8857 per_cu.is_debug_types = 0;
8858 per_cu.offset.sect_off = info_ptr - section->buffer;
8859 per_cu.section = section;
8861 init_cutu_and_read_dies_no_follow (&per_cu,
8862 &dwo_file->sections.abbrev,
8864 create_dwo_cu_reader,
8865 &create_dwo_cu_data);
8867 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8869 /* If we've already found one, complain. We only support one
8870 because having more than one requires hacking the dwo_name of
8871 each to match, which is highly unlikely to happen. */
8872 if (dwo_unit != NULL)
8874 complaint (&symfile_complaints,
8875 _("Multiple CUs in DWO file %s [in module %s]"),
8876 dwo_file->dwo_name, objfile->name);
8880 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8881 *dwo_unit = create_dwo_cu_data.dwo_unit;
8884 info_ptr += per_cu.length;
8890 /* DWP file .debug_{cu,tu}_index section format:
8891 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8895 Both index sections have the same format, and serve to map a 64-bit
8896 signature to a set of section numbers. Each section begins with a header,
8897 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8898 indexes, and a pool of 32-bit section numbers. The index sections will be
8899 aligned at 8-byte boundaries in the file.
8901 The index section header consists of:
8903 V, 32 bit version number
8905 N, 32 bit number of compilation units or type units in the index
8906 M, 32 bit number of slots in the hash table
8908 Numbers are recorded using the byte order of the application binary.
8910 We assume that N and M will not exceed 2^32 - 1.
8912 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8914 The hash table begins at offset 16 in the section, and consists of an array
8915 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8916 order of the application binary). Unused slots in the hash table are 0.
8917 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8919 The parallel table begins immediately after the hash table
8920 (at offset 16 + 8 * M from the beginning of the section), and consists of an
8921 array of 32-bit indexes (using the byte order of the application binary),
8922 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8923 table contains a 32-bit index into the pool of section numbers. For unused
8924 hash table slots, the corresponding entry in the parallel table will be 0.
8926 Given a 64-bit compilation unit signature or a type signature S, an entry
8927 in the hash table is located as follows:
8929 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8930 the low-order k bits all set to 1.
8932 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8934 3) If the hash table entry at index H matches the signature, use that
8935 entry. If the hash table entry at index H is unused (all zeroes),
8936 terminate the search: the signature is not present in the table.
8938 4) Let H = (H + H') modulo M. Repeat at Step 3.
8940 Because M > N and H' and M are relatively prime, the search is guaranteed
8941 to stop at an unused slot or find the match.
8943 The pool of section numbers begins immediately following the hash table
8944 (at offset 16 + 12 * M from the beginning of the section). The pool of
8945 section numbers consists of an array of 32-bit words (using the byte order
8946 of the application binary). Each item in the array is indexed starting
8947 from 0. The hash table entry provides the index of the first section
8948 number in the set. Additional section numbers in the set follow, and the
8949 set is terminated by a 0 entry (section number 0 is not used in ELF).
8951 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8952 section must be the first entry in the set, and the .debug_abbrev.dwo must
8953 be the second entry. Other members of the set may follow in any order. */
8955 /* Create a hash table to map DWO IDs to their CU/TU entry in
8956 .debug_{info,types}.dwo in DWP_FILE.
8957 Returns NULL if there isn't one.
8958 Note: This function processes DWP files only, not DWO files. */
8960 static struct dwp_hash_table *
8961 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8963 struct objfile *objfile = dwarf2_per_objfile->objfile;
8964 bfd *dbfd = dwp_file->dbfd;
8965 const gdb_byte *index_ptr, *index_end;
8966 struct dwarf2_section_info *index;
8967 uint32_t version, nr_units, nr_slots;
8968 struct dwp_hash_table *htab;
8971 index = &dwp_file->sections.tu_index;
8973 index = &dwp_file->sections.cu_index;
8975 if (dwarf2_section_empty_p (index))
8977 dwarf2_read_section (objfile, index);
8979 index_ptr = index->buffer;
8980 index_end = index_ptr + index->size;
8982 version = read_4_bytes (dbfd, index_ptr);
8983 index_ptr += 8; /* Skip the unused word. */
8984 nr_units = read_4_bytes (dbfd, index_ptr);
8986 nr_slots = read_4_bytes (dbfd, index_ptr);
8991 error (_("Dwarf Error: unsupported DWP file version (%s)"
8993 pulongest (version), dwp_file->name);
8995 if (nr_slots != (nr_slots & -nr_slots))
8997 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
8998 " is not power of 2 [in module %s]"),
8999 pulongest (nr_slots), dwp_file->name);
9002 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9003 htab->nr_units = nr_units;
9004 htab->nr_slots = nr_slots;
9005 htab->hash_table = index_ptr;
9006 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9007 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
9012 /* Update SECTIONS with the data from SECTP.
9014 This function is like the other "locate" section routines that are
9015 passed to bfd_map_over_sections, but in this context the sections to
9016 read comes from the DWP hash table, not the full ELF section table.
9018 The result is non-zero for success, or zero if an error was found. */
9021 locate_virtual_dwo_sections (asection *sectp,
9022 struct virtual_dwo_sections *sections)
9024 const struct dwop_section_names *names = &dwop_section_names;
9026 if (section_is_p (sectp->name, &names->abbrev_dwo))
9028 /* There can be only one. */
9029 if (sections->abbrev.asection != NULL)
9031 sections->abbrev.asection = sectp;
9032 sections->abbrev.size = bfd_get_section_size (sectp);
9034 else if (section_is_p (sectp->name, &names->info_dwo)
9035 || section_is_p (sectp->name, &names->types_dwo))
9037 /* There can be only one. */
9038 if (sections->info_or_types.asection != NULL)
9040 sections->info_or_types.asection = sectp;
9041 sections->info_or_types.size = bfd_get_section_size (sectp);
9043 else if (section_is_p (sectp->name, &names->line_dwo))
9045 /* There can be only one. */
9046 if (sections->line.asection != NULL)
9048 sections->line.asection = sectp;
9049 sections->line.size = bfd_get_section_size (sectp);
9051 else if (section_is_p (sectp->name, &names->loc_dwo))
9053 /* There can be only one. */
9054 if (sections->loc.asection != NULL)
9056 sections->loc.asection = sectp;
9057 sections->loc.size = bfd_get_section_size (sectp);
9059 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9061 /* There can be only one. */
9062 if (sections->macinfo.asection != NULL)
9064 sections->macinfo.asection = sectp;
9065 sections->macinfo.size = bfd_get_section_size (sectp);
9067 else if (section_is_p (sectp->name, &names->macro_dwo))
9069 /* There can be only one. */
9070 if (sections->macro.asection != NULL)
9072 sections->macro.asection = sectp;
9073 sections->macro.size = bfd_get_section_size (sectp);
9075 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9077 /* There can be only one. */
9078 if (sections->str_offsets.asection != NULL)
9080 sections->str_offsets.asection = sectp;
9081 sections->str_offsets.size = bfd_get_section_size (sectp);
9085 /* No other kind of section is valid. */
9092 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
9093 HTAB is the hash table from the DWP file.
9094 SECTION_INDEX is the index of the DWO in HTAB.
9095 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
9097 static struct dwo_unit *
9098 create_dwo_in_dwp (struct dwp_file *dwp_file,
9099 const struct dwp_hash_table *htab,
9100 uint32_t section_index,
9101 const char *comp_dir,
9102 ULONGEST signature, int is_debug_types)
9104 struct objfile *objfile = dwarf2_per_objfile->objfile;
9105 bfd *dbfd = dwp_file->dbfd;
9106 const char *kind = is_debug_types ? "TU" : "CU";
9107 struct dwo_file *dwo_file;
9108 struct dwo_unit *dwo_unit;
9109 struct virtual_dwo_sections sections;
9110 void **dwo_file_slot;
9111 char *virtual_dwo_name;
9112 struct dwarf2_section_info *cutu;
9113 struct cleanup *cleanups;
9116 if (dwarf2_read_debug)
9118 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP file: %s\n",
9120 pulongest (section_index), hex_string (signature),
9124 /* Fetch the sections of this DWO.
9125 Put a limit on the number of sections we look for so that bad data
9126 doesn't cause us to loop forever. */
9128 #define MAX_NR_DWO_SECTIONS \
9129 (1 /* .debug_info or .debug_types */ \
9130 + 1 /* .debug_abbrev */ \
9131 + 1 /* .debug_line */ \
9132 + 1 /* .debug_loc */ \
9133 + 1 /* .debug_str_offsets */ \
9134 + 1 /* .debug_macro */ \
9135 + 1 /* .debug_macinfo */ \
9136 + 1 /* trailing zero */)
9138 memset (§ions, 0, sizeof (sections));
9139 cleanups = make_cleanup (null_cleanup, 0);
9141 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
9144 uint32_t section_nr =
9147 + (section_index + i) * sizeof (uint32_t));
9149 if (section_nr == 0)
9151 if (section_nr >= dwp_file->num_sections)
9153 error (_("Dwarf Error: bad DWP hash table, section number too large"
9158 sectp = dwp_file->elf_sections[section_nr];
9159 if (! locate_virtual_dwo_sections (sectp, §ions))
9161 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9168 || sections.info_or_types.asection == NULL
9169 || sections.abbrev.asection == NULL)
9171 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9175 if (i == MAX_NR_DWO_SECTIONS)
9177 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9182 /* It's easier for the rest of the code if we fake a struct dwo_file and
9183 have dwo_unit "live" in that. At least for now.
9185 The DWP file can be made up of a random collection of CUs and TUs.
9186 However, for each CU + set of TUs that came from the same original DWO
9187 file, we want to combine them back into a virtual DWO file to save space
9188 (fewer struct dwo_file objects to allocated). Remember that for really
9189 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9192 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9193 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
9194 sections.line.asection ? sections.line.asection->id : 0,
9195 sections.loc.asection ? sections.loc.asection->id : 0,
9196 (sections.str_offsets.asection
9197 ? sections.str_offsets.asection->id
9199 make_cleanup (xfree, virtual_dwo_name);
9200 /* Can we use an existing virtual DWO file? */
9201 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9202 /* Create one if necessary. */
9203 if (*dwo_file_slot == NULL)
9205 if (dwarf2_read_debug)
9207 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9210 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9211 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9213 strlen (virtual_dwo_name));
9214 dwo_file->comp_dir = comp_dir;
9215 dwo_file->sections.abbrev = sections.abbrev;
9216 dwo_file->sections.line = sections.line;
9217 dwo_file->sections.loc = sections.loc;
9218 dwo_file->sections.macinfo = sections.macinfo;
9219 dwo_file->sections.macro = sections.macro;
9220 dwo_file->sections.str_offsets = sections.str_offsets;
9221 /* The "str" section is global to the entire DWP file. */
9222 dwo_file->sections.str = dwp_file->sections.str;
9223 /* The info or types section is assigned later to dwo_unit,
9224 there's no need to record it in dwo_file.
9225 Also, we can't simply record type sections in dwo_file because
9226 we record a pointer into the vector in dwo_unit. As we collect more
9227 types we'll grow the vector and eventually have to reallocate space
9228 for it, invalidating all the pointers into the current copy. */
9229 *dwo_file_slot = dwo_file;
9233 if (dwarf2_read_debug)
9235 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9238 dwo_file = *dwo_file_slot;
9240 do_cleanups (cleanups);
9242 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9243 dwo_unit->dwo_file = dwo_file;
9244 dwo_unit->signature = signature;
9245 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9246 sizeof (struct dwarf2_section_info));
9247 *dwo_unit->section = sections.info_or_types;
9248 /* offset, length, type_offset_in_tu are set later. */
9253 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
9255 static struct dwo_unit *
9256 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
9257 const struct dwp_hash_table *htab,
9258 const char *comp_dir,
9259 ULONGEST signature, int is_debug_types)
9261 bfd *dbfd = dwp_file->dbfd;
9262 uint32_t mask = htab->nr_slots - 1;
9263 uint32_t hash = signature & mask;
9264 uint32_t hash2 = ((signature >> 32) & mask) | 1;
9267 struct dwo_unit find_dwo_cu, *dwo_cu;
9269 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
9270 find_dwo_cu.signature = signature;
9271 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
9276 /* Use a for loop so that we don't loop forever on bad debug info. */
9277 for (i = 0; i < htab->nr_slots; ++i)
9279 ULONGEST signature_in_table;
9281 signature_in_table =
9282 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
9283 if (signature_in_table == signature)
9285 uint32_t section_index =
9286 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
9288 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
9289 comp_dir, signature, is_debug_types);
9292 if (signature_in_table == 0)
9294 hash = (hash + hash2) & mask;
9297 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
9302 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
9303 Open the file specified by FILE_NAME and hand it off to BFD for
9304 preliminary analysis. Return a newly initialized bfd *, which
9305 includes a canonicalized copy of FILE_NAME.
9306 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
9307 In case of trouble, return NULL.
9308 NOTE: This function is derived from symfile_bfd_open. */
9311 try_open_dwop_file (const char *file_name, int is_dwp)
9315 char *absolute_name;
9316 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
9317 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
9318 to debug_file_directory. */
9320 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
9322 if (*debug_file_directory != '\0')
9323 search_path = concat (".", dirname_separator_string, debug_file_directory,
9326 search_path = xstrdup (".");
9330 flags |= OPF_SEARCH_IN_PATH;
9331 desc = openp (search_path, flags, file_name,
9332 O_RDONLY | O_BINARY, &absolute_name);
9333 xfree (search_path);
9337 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
9338 xfree (absolute_name);
9339 if (sym_bfd == NULL)
9341 bfd_set_cacheable (sym_bfd, 1);
9343 if (!bfd_check_format (sym_bfd, bfd_object))
9345 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
9352 /* Try to open DWO file FILE_NAME.
9353 COMP_DIR is the DW_AT_comp_dir attribute.
9354 The result is the bfd handle of the file.
9355 If there is a problem finding or opening the file, return NULL.
9356 Upon success, the canonicalized path of the file is stored in the bfd,
9357 same as symfile_bfd_open. */
9360 open_dwo_file (const char *file_name, const char *comp_dir)
9364 if (IS_ABSOLUTE_PATH (file_name))
9365 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
9367 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
9369 if (comp_dir != NULL)
9371 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
9373 /* NOTE: If comp_dir is a relative path, this will also try the
9374 search path, which seems useful. */
9375 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/);
9376 xfree (path_to_try);
9381 /* That didn't work, try debug-file-directory, which, despite its name,
9382 is a list of paths. */
9384 if (*debug_file_directory == '\0')
9387 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
9390 /* This function is mapped across the sections and remembers the offset and
9391 size of each of the DWO debugging sections we are interested in. */
9394 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9396 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9397 const struct dwop_section_names *names = &dwop_section_names;
9399 if (section_is_p (sectp->name, &names->abbrev_dwo))
9401 dwo_sections->abbrev.asection = sectp;
9402 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9404 else if (section_is_p (sectp->name, &names->info_dwo))
9406 dwo_sections->info.asection = sectp;
9407 dwo_sections->info.size = bfd_get_section_size (sectp);
9409 else if (section_is_p (sectp->name, &names->line_dwo))
9411 dwo_sections->line.asection = sectp;
9412 dwo_sections->line.size = bfd_get_section_size (sectp);
9414 else if (section_is_p (sectp->name, &names->loc_dwo))
9416 dwo_sections->loc.asection = sectp;
9417 dwo_sections->loc.size = bfd_get_section_size (sectp);
9419 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9421 dwo_sections->macinfo.asection = sectp;
9422 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9424 else if (section_is_p (sectp->name, &names->macro_dwo))
9426 dwo_sections->macro.asection = sectp;
9427 dwo_sections->macro.size = bfd_get_section_size (sectp);
9429 else if (section_is_p (sectp->name, &names->str_dwo))
9431 dwo_sections->str.asection = sectp;
9432 dwo_sections->str.size = bfd_get_section_size (sectp);
9434 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9436 dwo_sections->str_offsets.asection = sectp;
9437 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9439 else if (section_is_p (sectp->name, &names->types_dwo))
9441 struct dwarf2_section_info type_section;
9443 memset (&type_section, 0, sizeof (type_section));
9444 type_section.asection = sectp;
9445 type_section.size = bfd_get_section_size (sectp);
9446 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9451 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9452 by PER_CU. This is for the non-DWP case.
9453 The result is NULL if DWO_NAME can't be found. */
9455 static struct dwo_file *
9456 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9457 const char *dwo_name, const char *comp_dir)
9459 struct objfile *objfile = dwarf2_per_objfile->objfile;
9460 struct dwo_file *dwo_file;
9462 struct cleanup *cleanups;
9464 dbfd = open_dwo_file (dwo_name, comp_dir);
9467 if (dwarf2_read_debug)
9468 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9471 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9472 dwo_file->dwo_name = dwo_name;
9473 dwo_file->comp_dir = comp_dir;
9474 dwo_file->dbfd = dbfd;
9476 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9478 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9480 dwo_file->cu = create_dwo_cu (dwo_file);
9482 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9483 dwo_file->sections.types);
9485 discard_cleanups (cleanups);
9487 if (dwarf2_read_debug)
9488 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9493 /* This function is mapped across the sections and remembers the offset and
9494 size of each of the DWP debugging sections we are interested in. */
9497 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9499 struct dwp_file *dwp_file = dwp_file_ptr;
9500 const struct dwop_section_names *names = &dwop_section_names;
9501 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9503 /* Record the ELF section number for later lookup: this is what the
9504 .debug_cu_index,.debug_tu_index tables use. */
9505 gdb_assert (elf_section_nr < dwp_file->num_sections);
9506 dwp_file->elf_sections[elf_section_nr] = sectp;
9508 /* Look for specific sections that we need. */
9509 if (section_is_p (sectp->name, &names->str_dwo))
9511 dwp_file->sections.str.asection = sectp;
9512 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9514 else if (section_is_p (sectp->name, &names->cu_index))
9516 dwp_file->sections.cu_index.asection = sectp;
9517 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9519 else if (section_is_p (sectp->name, &names->tu_index))
9521 dwp_file->sections.tu_index.asection = sectp;
9522 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9526 /* Hash function for dwp_file loaded CUs/TUs. */
9529 hash_dwp_loaded_cutus (const void *item)
9531 const struct dwo_unit *dwo_unit = item;
9533 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9534 return dwo_unit->signature;
9537 /* Equality function for dwp_file loaded CUs/TUs. */
9540 eq_dwp_loaded_cutus (const void *a, const void *b)
9542 const struct dwo_unit *dua = a;
9543 const struct dwo_unit *dub = b;
9545 return dua->signature == dub->signature;
9548 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9551 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9553 return htab_create_alloc_ex (3,
9554 hash_dwp_loaded_cutus,
9555 eq_dwp_loaded_cutus,
9557 &objfile->objfile_obstack,
9558 hashtab_obstack_allocate,
9559 dummy_obstack_deallocate);
9562 /* Try to open DWP file FILE_NAME.
9563 The result is the bfd handle of the file.
9564 If there is a problem finding or opening the file, return NULL.
9565 Upon success, the canonicalized path of the file is stored in the bfd,
9566 same as symfile_bfd_open. */
9569 open_dwp_file (const char *file_name)
9571 return try_open_dwop_file (file_name, 1 /*is_dwp*/);
9574 /* Initialize the use of the DWP file for the current objfile.
9575 By convention the name of the DWP file is ${objfile}.dwp.
9576 The result is NULL if it can't be found. */
9578 static struct dwp_file *
9579 open_and_init_dwp_file (void)
9581 struct objfile *objfile = dwarf2_per_objfile->objfile;
9582 struct dwp_file *dwp_file;
9585 struct cleanup *cleanups;
9587 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9588 cleanups = make_cleanup (xfree, dwp_name);
9590 dbfd = open_dwp_file (dwp_name);
9593 if (dwarf2_read_debug)
9594 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9595 do_cleanups (cleanups);
9598 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9599 dwp_file->name = bfd_get_filename (dbfd);
9600 dwp_file->dbfd = dbfd;
9601 do_cleanups (cleanups);
9603 /* +1: section 0 is unused */
9604 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9605 dwp_file->elf_sections =
9606 OBSTACK_CALLOC (&objfile->objfile_obstack,
9607 dwp_file->num_sections, asection *);
9609 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9611 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9613 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9615 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9617 if (dwarf2_read_debug)
9619 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9620 fprintf_unfiltered (gdb_stdlog,
9621 " %s CUs, %s TUs\n",
9622 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
9623 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
9629 /* Wrapper around open_and_init_dwp_file, only open it once. */
9631 static struct dwp_file *
9634 if (! dwarf2_per_objfile->dwp_checked)
9636 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9637 dwarf2_per_objfile->dwp_checked = 1;
9639 return dwarf2_per_objfile->dwp_file;
9642 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9643 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9644 or in the DWP file for the objfile, referenced by THIS_UNIT.
9645 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9646 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9648 This is called, for example, when wanting to read a variable with a
9649 complex location. Therefore we don't want to do file i/o for every call.
9650 Therefore we don't want to look for a DWO file on every call.
9651 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9652 then we check if we've already seen DWO_NAME, and only THEN do we check
9655 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9656 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9658 static struct dwo_unit *
9659 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9660 const char *dwo_name, const char *comp_dir,
9661 ULONGEST signature, int is_debug_types)
9663 struct objfile *objfile = dwarf2_per_objfile->objfile;
9664 const char *kind = is_debug_types ? "TU" : "CU";
9665 void **dwo_file_slot;
9666 struct dwo_file *dwo_file;
9667 struct dwp_file *dwp_file;
9669 /* First see if there's a DWP file.
9670 If we have a DWP file but didn't find the DWO inside it, don't
9671 look for the original DWO file. It makes gdb behave differently
9672 depending on whether one is debugging in the build tree. */
9674 dwp_file = get_dwp_file ();
9675 if (dwp_file != NULL)
9677 const struct dwp_hash_table *dwp_htab =
9678 is_debug_types ? dwp_file->tus : dwp_file->cus;
9680 if (dwp_htab != NULL)
9682 struct dwo_unit *dwo_cutu =
9683 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9684 signature, is_debug_types);
9686 if (dwo_cutu != NULL)
9688 if (dwarf2_read_debug)
9690 fprintf_unfiltered (gdb_stdlog,
9691 "Virtual DWO %s %s found: @%s\n",
9692 kind, hex_string (signature),
9693 host_address_to_string (dwo_cutu));
9701 /* No DWP file, look for the DWO file. */
9703 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9704 if (*dwo_file_slot == NULL)
9706 /* Read in the file and build a table of the CUs/TUs it contains. */
9707 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9709 /* NOTE: This will be NULL if unable to open the file. */
9710 dwo_file = *dwo_file_slot;
9712 if (dwo_file != NULL)
9714 struct dwo_unit *dwo_cutu = NULL;
9716 if (is_debug_types && dwo_file->tus)
9718 struct dwo_unit find_dwo_cutu;
9720 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9721 find_dwo_cutu.signature = signature;
9722 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9724 else if (!is_debug_types && dwo_file->cu)
9726 if (signature == dwo_file->cu->signature)
9727 dwo_cutu = dwo_file->cu;
9730 if (dwo_cutu != NULL)
9732 if (dwarf2_read_debug)
9734 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9735 kind, dwo_name, hex_string (signature),
9736 host_address_to_string (dwo_cutu));
9743 /* We didn't find it. This could mean a dwo_id mismatch, or
9744 someone deleted the DWO/DWP file, or the search path isn't set up
9745 correctly to find the file. */
9747 if (dwarf2_read_debug)
9749 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9750 kind, dwo_name, hex_string (signature));
9753 complaint (&symfile_complaints,
9754 _("Could not find DWO %s %s(%s) referenced by %s at offset 0x%x"
9756 kind, dwo_name, hex_string (signature),
9757 this_unit->is_debug_types ? "TU" : "CU",
9758 this_unit->offset.sect_off, objfile->name);
9762 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9763 See lookup_dwo_cutu_unit for details. */
9765 static struct dwo_unit *
9766 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9767 const char *dwo_name, const char *comp_dir,
9770 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9773 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9774 See lookup_dwo_cutu_unit for details. */
9776 static struct dwo_unit *
9777 lookup_dwo_type_unit (struct signatured_type *this_tu,
9778 const char *dwo_name, const char *comp_dir)
9780 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9783 /* Free all resources associated with DWO_FILE.
9784 Close the DWO file and munmap the sections.
9785 All memory should be on the objfile obstack. */
9788 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9791 struct dwarf2_section_info *section;
9793 /* Note: dbfd is NULL for virtual DWO files. */
9794 gdb_bfd_unref (dwo_file->dbfd);
9796 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9799 /* Wrapper for free_dwo_file for use in cleanups. */
9802 free_dwo_file_cleanup (void *arg)
9804 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9805 struct objfile *objfile = dwarf2_per_objfile->objfile;
9807 free_dwo_file (dwo_file, objfile);
9810 /* Traversal function for free_dwo_files. */
9813 free_dwo_file_from_slot (void **slot, void *info)
9815 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9816 struct objfile *objfile = (struct objfile *) info;
9818 free_dwo_file (dwo_file, objfile);
9823 /* Free all resources associated with DWO_FILES. */
9826 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9828 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9831 /* Read in various DIEs. */
9833 /* qsort helper for inherit_abstract_dies. */
9836 unsigned_int_compar (const void *ap, const void *bp)
9838 unsigned int a = *(unsigned int *) ap;
9839 unsigned int b = *(unsigned int *) bp;
9841 return (a > b) - (b > a);
9844 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9845 Inherit only the children of the DW_AT_abstract_origin DIE not being
9846 already referenced by DW_AT_abstract_origin from the children of the
9850 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9852 struct die_info *child_die;
9853 unsigned die_children_count;
9854 /* CU offsets which were referenced by children of the current DIE. */
9855 sect_offset *offsets;
9856 sect_offset *offsets_end, *offsetp;
9857 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9858 struct die_info *origin_die;
9859 /* Iterator of the ORIGIN_DIE children. */
9860 struct die_info *origin_child_die;
9861 struct cleanup *cleanups;
9862 struct attribute *attr;
9863 struct dwarf2_cu *origin_cu;
9864 struct pending **origin_previous_list_in_scope;
9866 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9870 /* Note that following die references may follow to a die in a
9874 origin_die = follow_die_ref (die, attr, &origin_cu);
9876 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9878 origin_previous_list_in_scope = origin_cu->list_in_scope;
9879 origin_cu->list_in_scope = cu->list_in_scope;
9881 if (die->tag != origin_die->tag
9882 && !(die->tag == DW_TAG_inlined_subroutine
9883 && origin_die->tag == DW_TAG_subprogram))
9884 complaint (&symfile_complaints,
9885 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9886 die->offset.sect_off, origin_die->offset.sect_off);
9888 child_die = die->child;
9889 die_children_count = 0;
9890 while (child_die && child_die->tag)
9892 child_die = sibling_die (child_die);
9893 die_children_count++;
9895 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9896 cleanups = make_cleanup (xfree, offsets);
9898 offsets_end = offsets;
9899 child_die = die->child;
9900 while (child_die && child_die->tag)
9902 /* For each CHILD_DIE, find the corresponding child of
9903 ORIGIN_DIE. If there is more than one layer of
9904 DW_AT_abstract_origin, follow them all; there shouldn't be,
9905 but GCC versions at least through 4.4 generate this (GCC PR
9907 struct die_info *child_origin_die = child_die;
9908 struct dwarf2_cu *child_origin_cu = cu;
9912 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9916 child_origin_die = follow_die_ref (child_origin_die, attr,
9920 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9921 counterpart may exist. */
9922 if (child_origin_die != child_die)
9924 if (child_die->tag != child_origin_die->tag
9925 && !(child_die->tag == DW_TAG_inlined_subroutine
9926 && child_origin_die->tag == DW_TAG_subprogram))
9927 complaint (&symfile_complaints,
9928 _("Child DIE 0x%x and its abstract origin 0x%x have "
9929 "different tags"), child_die->offset.sect_off,
9930 child_origin_die->offset.sect_off);
9931 if (child_origin_die->parent != origin_die)
9932 complaint (&symfile_complaints,
9933 _("Child DIE 0x%x and its abstract origin 0x%x have "
9934 "different parents"), child_die->offset.sect_off,
9935 child_origin_die->offset.sect_off);
9937 *offsets_end++ = child_origin_die->offset;
9939 child_die = sibling_die (child_die);
9941 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9942 unsigned_int_compar);
9943 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9944 if (offsetp[-1].sect_off == offsetp->sect_off)
9945 complaint (&symfile_complaints,
9946 _("Multiple children of DIE 0x%x refer "
9947 "to DIE 0x%x as their abstract origin"),
9948 die->offset.sect_off, offsetp->sect_off);
9951 origin_child_die = origin_die->child;
9952 while (origin_child_die && origin_child_die->tag)
9954 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9955 while (offsetp < offsets_end
9956 && offsetp->sect_off < origin_child_die->offset.sect_off)
9958 if (offsetp >= offsets_end
9959 || offsetp->sect_off > origin_child_die->offset.sect_off)
9961 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9962 process_die (origin_child_die, origin_cu);
9964 origin_child_die = sibling_die (origin_child_die);
9966 origin_cu->list_in_scope = origin_previous_list_in_scope;
9968 do_cleanups (cleanups);
9972 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
9974 struct objfile *objfile = cu->objfile;
9975 struct context_stack *new;
9978 struct die_info *child_die;
9979 struct attribute *attr, *call_line, *call_file;
9982 struct block *block;
9983 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
9984 VEC (symbolp) *template_args = NULL;
9985 struct template_symbol *templ_func = NULL;
9989 /* If we do not have call site information, we can't show the
9990 caller of this inlined function. That's too confusing, so
9991 only use the scope for local variables. */
9992 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
9993 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
9994 if (call_line == NULL || call_file == NULL)
9996 read_lexical_block_scope (die, cu);
10001 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10003 name = dwarf2_name (die, cu);
10005 /* Ignore functions with missing or empty names. These are actually
10006 illegal according to the DWARF standard. */
10009 complaint (&symfile_complaints,
10010 _("missing name for subprogram DIE at %d"),
10011 die->offset.sect_off);
10015 /* Ignore functions with missing or invalid low and high pc attributes. */
10016 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10018 attr = dwarf2_attr (die, DW_AT_external, cu);
10019 if (!attr || !DW_UNSND (attr))
10020 complaint (&symfile_complaints,
10021 _("cannot get low and high bounds "
10022 "for subprogram DIE at %d"),
10023 die->offset.sect_off);
10028 highpc += baseaddr;
10030 /* If we have any template arguments, then we must allocate a
10031 different sort of symbol. */
10032 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
10034 if (child_die->tag == DW_TAG_template_type_param
10035 || child_die->tag == DW_TAG_template_value_param)
10037 templ_func = allocate_template_symbol (objfile);
10038 templ_func->base.is_cplus_template_function = 1;
10043 new = push_context (0, lowpc);
10044 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
10045 (struct symbol *) templ_func);
10047 /* If there is a location expression for DW_AT_frame_base, record
10049 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
10051 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
10053 cu->list_in_scope = &local_symbols;
10055 if (die->child != NULL)
10057 child_die = die->child;
10058 while (child_die && child_die->tag)
10060 if (child_die->tag == DW_TAG_template_type_param
10061 || child_die->tag == DW_TAG_template_value_param)
10063 struct symbol *arg = new_symbol (child_die, NULL, cu);
10066 VEC_safe_push (symbolp, template_args, arg);
10069 process_die (child_die, cu);
10070 child_die = sibling_die (child_die);
10074 inherit_abstract_dies (die, cu);
10076 /* If we have a DW_AT_specification, we might need to import using
10077 directives from the context of the specification DIE. See the
10078 comment in determine_prefix. */
10079 if (cu->language == language_cplus
10080 && dwarf2_attr (die, DW_AT_specification, cu))
10082 struct dwarf2_cu *spec_cu = cu;
10083 struct die_info *spec_die = die_specification (die, &spec_cu);
10087 child_die = spec_die->child;
10088 while (child_die && child_die->tag)
10090 if (child_die->tag == DW_TAG_imported_module)
10091 process_die (child_die, spec_cu);
10092 child_die = sibling_die (child_die);
10095 /* In some cases, GCC generates specification DIEs that
10096 themselves contain DW_AT_specification attributes. */
10097 spec_die = die_specification (spec_die, &spec_cu);
10101 new = pop_context ();
10102 /* Make a block for the local symbols within. */
10103 block = finish_block (new->name, &local_symbols, new->old_blocks,
10104 lowpc, highpc, objfile);
10106 /* For C++, set the block's scope. */
10107 if ((cu->language == language_cplus || cu->language == language_fortran)
10108 && cu->processing_has_namespace_info)
10109 block_set_scope (block, determine_prefix (die, cu),
10110 &objfile->objfile_obstack);
10112 /* If we have address ranges, record them. */
10113 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10115 /* Attach template arguments to function. */
10116 if (! VEC_empty (symbolp, template_args))
10118 gdb_assert (templ_func != NULL);
10120 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
10121 templ_func->template_arguments
10122 = obstack_alloc (&objfile->objfile_obstack,
10123 (templ_func->n_template_arguments
10124 * sizeof (struct symbol *)));
10125 memcpy (templ_func->template_arguments,
10126 VEC_address (symbolp, template_args),
10127 (templ_func->n_template_arguments * sizeof (struct symbol *)));
10128 VEC_free (symbolp, template_args);
10131 /* In C++, we can have functions nested inside functions (e.g., when
10132 a function declares a class that has methods). This means that
10133 when we finish processing a function scope, we may need to go
10134 back to building a containing block's symbol lists. */
10135 local_symbols = new->locals;
10136 using_directives = new->using_directives;
10138 /* If we've finished processing a top-level function, subsequent
10139 symbols go in the file symbol list. */
10140 if (outermost_context_p ())
10141 cu->list_in_scope = &file_symbols;
10144 /* Process all the DIES contained within a lexical block scope. Start
10145 a new scope, process the dies, and then close the scope. */
10148 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
10150 struct objfile *objfile = cu->objfile;
10151 struct context_stack *new;
10152 CORE_ADDR lowpc, highpc;
10153 struct die_info *child_die;
10154 CORE_ADDR baseaddr;
10156 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10158 /* Ignore blocks with missing or invalid low and high pc attributes. */
10159 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
10160 as multiple lexical blocks? Handling children in a sane way would
10161 be nasty. Might be easier to properly extend generic blocks to
10162 describe ranges. */
10163 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10166 highpc += baseaddr;
10168 push_context (0, lowpc);
10169 if (die->child != NULL)
10171 child_die = die->child;
10172 while (child_die && child_die->tag)
10174 process_die (child_die, cu);
10175 child_die = sibling_die (child_die);
10178 new = pop_context ();
10180 if (local_symbols != NULL || using_directives != NULL)
10182 struct block *block
10183 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
10186 /* Note that recording ranges after traversing children, as we
10187 do here, means that recording a parent's ranges entails
10188 walking across all its children's ranges as they appear in
10189 the address map, which is quadratic behavior.
10191 It would be nicer to record the parent's ranges before
10192 traversing its children, simply overriding whatever you find
10193 there. But since we don't even decide whether to create a
10194 block until after we've traversed its children, that's hard
10196 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10198 local_symbols = new->locals;
10199 using_directives = new->using_directives;
10202 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
10205 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
10207 struct objfile *objfile = cu->objfile;
10208 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10209 CORE_ADDR pc, baseaddr;
10210 struct attribute *attr;
10211 struct call_site *call_site, call_site_local;
10214 struct die_info *child_die;
10216 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10218 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10221 complaint (&symfile_complaints,
10222 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
10223 "DIE 0x%x [in module %s]"),
10224 die->offset.sect_off, objfile->name);
10227 pc = DW_ADDR (attr) + baseaddr;
10229 if (cu->call_site_htab == NULL)
10230 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
10231 NULL, &objfile->objfile_obstack,
10232 hashtab_obstack_allocate, NULL);
10233 call_site_local.pc = pc;
10234 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
10237 complaint (&symfile_complaints,
10238 _("Duplicate PC %s for DW_TAG_GNU_call_site "
10239 "DIE 0x%x [in module %s]"),
10240 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
10244 /* Count parameters at the caller. */
10247 for (child_die = die->child; child_die && child_die->tag;
10248 child_die = sibling_die (child_die))
10250 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10252 complaint (&symfile_complaints,
10253 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
10254 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10255 child_die->tag, child_die->offset.sect_off, objfile->name);
10262 call_site = obstack_alloc (&objfile->objfile_obstack,
10263 (sizeof (*call_site)
10264 + (sizeof (*call_site->parameter)
10265 * (nparams - 1))));
10267 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
10268 call_site->pc = pc;
10270 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
10272 struct die_info *func_die;
10274 /* Skip also over DW_TAG_inlined_subroutine. */
10275 for (func_die = die->parent;
10276 func_die && func_die->tag != DW_TAG_subprogram
10277 && func_die->tag != DW_TAG_subroutine_type;
10278 func_die = func_die->parent);
10280 /* DW_AT_GNU_all_call_sites is a superset
10281 of DW_AT_GNU_all_tail_call_sites. */
10283 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
10284 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
10286 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
10287 not complete. But keep CALL_SITE for look ups via call_site_htab,
10288 both the initial caller containing the real return address PC and
10289 the final callee containing the current PC of a chain of tail
10290 calls do not need to have the tail call list complete. But any
10291 function candidate for a virtual tail call frame searched via
10292 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
10293 determined unambiguously. */
10297 struct type *func_type = NULL;
10300 func_type = get_die_type (func_die, cu);
10301 if (func_type != NULL)
10303 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
10305 /* Enlist this call site to the function. */
10306 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
10307 TYPE_TAIL_CALL_LIST (func_type) = call_site;
10310 complaint (&symfile_complaints,
10311 _("Cannot find function owning DW_TAG_GNU_call_site "
10312 "DIE 0x%x [in module %s]"),
10313 die->offset.sect_off, objfile->name);
10317 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
10319 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10320 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
10321 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
10322 /* Keep NULL DWARF_BLOCK. */;
10323 else if (attr_form_is_block (attr))
10325 struct dwarf2_locexpr_baton *dlbaton;
10327 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
10328 dlbaton->data = DW_BLOCK (attr)->data;
10329 dlbaton->size = DW_BLOCK (attr)->size;
10330 dlbaton->per_cu = cu->per_cu;
10332 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
10334 else if (is_ref_attr (attr))
10336 struct dwarf2_cu *target_cu = cu;
10337 struct die_info *target_die;
10339 target_die = follow_die_ref (die, attr, &target_cu);
10340 gdb_assert (target_cu->objfile == objfile);
10341 if (die_is_declaration (target_die, target_cu))
10343 const char *target_physname = NULL;
10344 struct attribute *target_attr;
10346 /* Prefer the mangled name; otherwise compute the demangled one. */
10347 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
10348 if (target_attr == NULL)
10349 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
10351 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
10352 target_physname = DW_STRING (target_attr);
10354 target_physname = dwarf2_physname (NULL, target_die, target_cu);
10355 if (target_physname == NULL)
10356 complaint (&symfile_complaints,
10357 _("DW_AT_GNU_call_site_target target DIE has invalid "
10358 "physname, for referencing DIE 0x%x [in module %s]"),
10359 die->offset.sect_off, objfile->name);
10361 SET_FIELD_PHYSNAME (call_site->target, target_physname);
10367 /* DW_AT_entry_pc should be preferred. */
10368 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
10369 complaint (&symfile_complaints,
10370 _("DW_AT_GNU_call_site_target target DIE has invalid "
10371 "low pc, for referencing DIE 0x%x [in module %s]"),
10372 die->offset.sect_off, objfile->name);
10374 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
10378 complaint (&symfile_complaints,
10379 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
10380 "block nor reference, for DIE 0x%x [in module %s]"),
10381 die->offset.sect_off, objfile->name);
10383 call_site->per_cu = cu->per_cu;
10385 for (child_die = die->child;
10386 child_die && child_die->tag;
10387 child_die = sibling_die (child_die))
10389 struct call_site_parameter *parameter;
10390 struct attribute *loc, *origin;
10392 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10394 /* Already printed the complaint above. */
10398 gdb_assert (call_site->parameter_count < nparams);
10399 parameter = &call_site->parameter[call_site->parameter_count];
10401 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10402 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10403 register is contained in DW_AT_GNU_call_site_value. */
10405 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10406 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10407 if (loc == NULL && origin != NULL && is_ref_attr (origin))
10409 sect_offset offset;
10411 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10412 offset = dwarf2_get_ref_die_offset (origin);
10413 if (!offset_in_cu_p (&cu->header, offset))
10415 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10416 binding can be done only inside one CU. Such referenced DIE
10417 therefore cannot be even moved to DW_TAG_partial_unit. */
10418 complaint (&symfile_complaints,
10419 _("DW_AT_abstract_origin offset is not in CU for "
10420 "DW_TAG_GNU_call_site child DIE 0x%x "
10422 child_die->offset.sect_off, objfile->name);
10425 parameter->u.param_offset.cu_off = (offset.sect_off
10426 - cu->header.offset.sect_off);
10428 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10430 complaint (&symfile_complaints,
10431 _("No DW_FORM_block* DW_AT_location for "
10432 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10433 child_die->offset.sect_off, objfile->name);
10438 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10439 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10440 if (parameter->u.dwarf_reg != -1)
10441 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10442 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10443 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10444 ¶meter->u.fb_offset))
10445 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10448 complaint (&symfile_complaints,
10449 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10450 "for DW_FORM_block* DW_AT_location is supported for "
10451 "DW_TAG_GNU_call_site child DIE 0x%x "
10453 child_die->offset.sect_off, objfile->name);
10458 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10459 if (!attr_form_is_block (attr))
10461 complaint (&symfile_complaints,
10462 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10463 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10464 child_die->offset.sect_off, objfile->name);
10467 parameter->value = DW_BLOCK (attr)->data;
10468 parameter->value_size = DW_BLOCK (attr)->size;
10470 /* Parameters are not pre-cleared by memset above. */
10471 parameter->data_value = NULL;
10472 parameter->data_value_size = 0;
10473 call_site->parameter_count++;
10475 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10478 if (!attr_form_is_block (attr))
10479 complaint (&symfile_complaints,
10480 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10481 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10482 child_die->offset.sect_off, objfile->name);
10485 parameter->data_value = DW_BLOCK (attr)->data;
10486 parameter->data_value_size = DW_BLOCK (attr)->size;
10492 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10493 Return 1 if the attributes are present and valid, otherwise, return 0.
10494 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10497 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10498 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10499 struct partial_symtab *ranges_pst)
10501 struct objfile *objfile = cu->objfile;
10502 struct comp_unit_head *cu_header = &cu->header;
10503 bfd *obfd = objfile->obfd;
10504 unsigned int addr_size = cu_header->addr_size;
10505 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10506 /* Base address selection entry. */
10509 unsigned int dummy;
10510 const gdb_byte *buffer;
10514 CORE_ADDR high = 0;
10515 CORE_ADDR baseaddr;
10517 found_base = cu->base_known;
10518 base = cu->base_address;
10520 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10521 if (offset >= dwarf2_per_objfile->ranges.size)
10523 complaint (&symfile_complaints,
10524 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10528 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10530 /* Read in the largest possible address. */
10531 marker = read_address (obfd, buffer, cu, &dummy);
10532 if ((marker & mask) == mask)
10534 /* If we found the largest possible address, then
10535 read the base address. */
10536 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10537 buffer += 2 * addr_size;
10538 offset += 2 * addr_size;
10544 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10548 CORE_ADDR range_beginning, range_end;
10550 range_beginning = read_address (obfd, buffer, cu, &dummy);
10551 buffer += addr_size;
10552 range_end = read_address (obfd, buffer, cu, &dummy);
10553 buffer += addr_size;
10554 offset += 2 * addr_size;
10556 /* An end of list marker is a pair of zero addresses. */
10557 if (range_beginning == 0 && range_end == 0)
10558 /* Found the end of list entry. */
10561 /* Each base address selection entry is a pair of 2 values.
10562 The first is the largest possible address, the second is
10563 the base address. Check for a base address here. */
10564 if ((range_beginning & mask) == mask)
10566 /* If we found the largest possible address, then
10567 read the base address. */
10568 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10575 /* We have no valid base address for the ranges
10577 complaint (&symfile_complaints,
10578 _("Invalid .debug_ranges data (no base address)"));
10582 if (range_beginning > range_end)
10584 /* Inverted range entries are invalid. */
10585 complaint (&symfile_complaints,
10586 _("Invalid .debug_ranges data (inverted range)"));
10590 /* Empty range entries have no effect. */
10591 if (range_beginning == range_end)
10594 range_beginning += base;
10597 /* A not-uncommon case of bad debug info.
10598 Don't pollute the addrmap with bad data. */
10599 if (range_beginning + baseaddr == 0
10600 && !dwarf2_per_objfile->has_section_at_zero)
10602 complaint (&symfile_complaints,
10603 _(".debug_ranges entry has start address of zero"
10604 " [in module %s]"), objfile->name);
10608 if (ranges_pst != NULL)
10609 addrmap_set_empty (objfile->psymtabs_addrmap,
10610 range_beginning + baseaddr,
10611 range_end - 1 + baseaddr,
10614 /* FIXME: This is recording everything as a low-high
10615 segment of consecutive addresses. We should have a
10616 data structure for discontiguous block ranges
10620 low = range_beginning;
10626 if (range_beginning < low)
10627 low = range_beginning;
10628 if (range_end > high)
10634 /* If the first entry is an end-of-list marker, the range
10635 describes an empty scope, i.e. no instructions. */
10641 *high_return = high;
10645 /* Get low and high pc attributes from a die. Return 1 if the attributes
10646 are present and valid, otherwise, return 0. Return -1 if the range is
10647 discontinuous, i.e. derived from DW_AT_ranges information. */
10650 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10651 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10652 struct partial_symtab *pst)
10654 struct attribute *attr;
10655 struct attribute *attr_high;
10657 CORE_ADDR high = 0;
10660 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10663 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10666 low = DW_ADDR (attr);
10667 if (attr_high->form == DW_FORM_addr
10668 || attr_high->form == DW_FORM_GNU_addr_index)
10669 high = DW_ADDR (attr_high);
10671 high = low + DW_UNSND (attr_high);
10674 /* Found high w/o low attribute. */
10677 /* Found consecutive range of addresses. */
10682 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10685 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10686 We take advantage of the fact that DW_AT_ranges does not appear
10687 in DW_TAG_compile_unit of DWO files. */
10688 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10689 unsigned int ranges_offset = (DW_UNSND (attr)
10690 + (need_ranges_base
10694 /* Value of the DW_AT_ranges attribute is the offset in the
10695 .debug_ranges section. */
10696 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10698 /* Found discontinuous range of addresses. */
10703 /* read_partial_die has also the strict LOW < HIGH requirement. */
10707 /* When using the GNU linker, .gnu.linkonce. sections are used to
10708 eliminate duplicate copies of functions and vtables and such.
10709 The linker will arbitrarily choose one and discard the others.
10710 The AT_*_pc values for such functions refer to local labels in
10711 these sections. If the section from that file was discarded, the
10712 labels are not in the output, so the relocs get a value of 0.
10713 If this is a discarded function, mark the pc bounds as invalid,
10714 so that GDB will ignore it. */
10715 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10724 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10725 its low and high PC addresses. Do nothing if these addresses could not
10726 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10727 and HIGHPC to the high address if greater than HIGHPC. */
10730 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10731 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10732 struct dwarf2_cu *cu)
10734 CORE_ADDR low, high;
10735 struct die_info *child = die->child;
10737 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10739 *lowpc = min (*lowpc, low);
10740 *highpc = max (*highpc, high);
10743 /* If the language does not allow nested subprograms (either inside
10744 subprograms or lexical blocks), we're done. */
10745 if (cu->language != language_ada)
10748 /* Check all the children of the given DIE. If it contains nested
10749 subprograms, then check their pc bounds. Likewise, we need to
10750 check lexical blocks as well, as they may also contain subprogram
10752 while (child && child->tag)
10754 if (child->tag == DW_TAG_subprogram
10755 || child->tag == DW_TAG_lexical_block)
10756 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10757 child = sibling_die (child);
10761 /* Get the low and high pc's represented by the scope DIE, and store
10762 them in *LOWPC and *HIGHPC. If the correct values can't be
10763 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10766 get_scope_pc_bounds (struct die_info *die,
10767 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10768 struct dwarf2_cu *cu)
10770 CORE_ADDR best_low = (CORE_ADDR) -1;
10771 CORE_ADDR best_high = (CORE_ADDR) 0;
10772 CORE_ADDR current_low, current_high;
10774 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10776 best_low = current_low;
10777 best_high = current_high;
10781 struct die_info *child = die->child;
10783 while (child && child->tag)
10785 switch (child->tag) {
10786 case DW_TAG_subprogram:
10787 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10789 case DW_TAG_namespace:
10790 case DW_TAG_module:
10791 /* FIXME: carlton/2004-01-16: Should we do this for
10792 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10793 that current GCC's always emit the DIEs corresponding
10794 to definitions of methods of classes as children of a
10795 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10796 the DIEs giving the declarations, which could be
10797 anywhere). But I don't see any reason why the
10798 standards says that they have to be there. */
10799 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10801 if (current_low != ((CORE_ADDR) -1))
10803 best_low = min (best_low, current_low);
10804 best_high = max (best_high, current_high);
10812 child = sibling_die (child);
10817 *highpc = best_high;
10820 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10824 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10825 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10827 struct objfile *objfile = cu->objfile;
10828 struct attribute *attr;
10829 struct attribute *attr_high;
10831 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10834 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10837 CORE_ADDR low = DW_ADDR (attr);
10839 if (attr_high->form == DW_FORM_addr
10840 || attr_high->form == DW_FORM_GNU_addr_index)
10841 high = DW_ADDR (attr_high);
10843 high = low + DW_UNSND (attr_high);
10845 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10849 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10852 bfd *obfd = objfile->obfd;
10853 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10854 We take advantage of the fact that DW_AT_ranges does not appear
10855 in DW_TAG_compile_unit of DWO files. */
10856 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10858 /* The value of the DW_AT_ranges attribute is the offset of the
10859 address range list in the .debug_ranges section. */
10860 unsigned long offset = (DW_UNSND (attr)
10861 + (need_ranges_base ? cu->ranges_base : 0));
10862 const gdb_byte *buffer;
10864 /* For some target architectures, but not others, the
10865 read_address function sign-extends the addresses it returns.
10866 To recognize base address selection entries, we need a
10868 unsigned int addr_size = cu->header.addr_size;
10869 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10871 /* The base address, to which the next pair is relative. Note
10872 that this 'base' is a DWARF concept: most entries in a range
10873 list are relative, to reduce the number of relocs against the
10874 debugging information. This is separate from this function's
10875 'baseaddr' argument, which GDB uses to relocate debugging
10876 information from a shared library based on the address at
10877 which the library was loaded. */
10878 CORE_ADDR base = cu->base_address;
10879 int base_known = cu->base_known;
10881 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10882 if (offset >= dwarf2_per_objfile->ranges.size)
10884 complaint (&symfile_complaints,
10885 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10889 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10893 unsigned int bytes_read;
10894 CORE_ADDR start, end;
10896 start = read_address (obfd, buffer, cu, &bytes_read);
10897 buffer += bytes_read;
10898 end = read_address (obfd, buffer, cu, &bytes_read);
10899 buffer += bytes_read;
10901 /* Did we find the end of the range list? */
10902 if (start == 0 && end == 0)
10905 /* Did we find a base address selection entry? */
10906 else if ((start & base_select_mask) == base_select_mask)
10912 /* We found an ordinary address range. */
10917 complaint (&symfile_complaints,
10918 _("Invalid .debug_ranges data "
10919 "(no base address)"));
10925 /* Inverted range entries are invalid. */
10926 complaint (&symfile_complaints,
10927 _("Invalid .debug_ranges data "
10928 "(inverted range)"));
10932 /* Empty range entries have no effect. */
10936 start += base + baseaddr;
10937 end += base + baseaddr;
10939 /* A not-uncommon case of bad debug info.
10940 Don't pollute the addrmap with bad data. */
10941 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10943 complaint (&symfile_complaints,
10944 _(".debug_ranges entry has start address of zero"
10945 " [in module %s]"), objfile->name);
10949 record_block_range (block, start, end - 1);
10955 /* Check whether the producer field indicates either of GCC < 4.6, or the
10956 Intel C/C++ compiler, and cache the result in CU. */
10959 check_producer (struct dwarf2_cu *cu)
10962 int major, minor, release;
10964 if (cu->producer == NULL)
10966 /* For unknown compilers expect their behavior is DWARF version
10969 GCC started to support .debug_types sections by -gdwarf-4 since
10970 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
10971 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
10972 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
10973 interpreted incorrectly by GDB now - GCC PR debug/48229. */
10975 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
10977 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
10979 cs = &cu->producer[strlen ("GNU ")];
10980 while (*cs && !isdigit (*cs))
10982 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
10984 /* Not recognized as GCC. */
10988 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
10989 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
10992 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
10993 cu->producer_is_icc = 1;
10996 /* For other non-GCC compilers, expect their behavior is DWARF version
11000 cu->checked_producer = 1;
11003 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
11004 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
11005 during 4.6.0 experimental. */
11008 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
11010 if (!cu->checked_producer)
11011 check_producer (cu);
11013 return cu->producer_is_gxx_lt_4_6;
11016 /* Return the default accessibility type if it is not overriden by
11017 DW_AT_accessibility. */
11019 static enum dwarf_access_attribute
11020 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
11022 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
11024 /* The default DWARF 2 accessibility for members is public, the default
11025 accessibility for inheritance is private. */
11027 if (die->tag != DW_TAG_inheritance)
11028 return DW_ACCESS_public;
11030 return DW_ACCESS_private;
11034 /* DWARF 3+ defines the default accessibility a different way. The same
11035 rules apply now for DW_TAG_inheritance as for the members and it only
11036 depends on the container kind. */
11038 if (die->parent->tag == DW_TAG_class_type)
11039 return DW_ACCESS_private;
11041 return DW_ACCESS_public;
11045 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
11046 offset. If the attribute was not found return 0, otherwise return
11047 1. If it was found but could not properly be handled, set *OFFSET
11051 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
11054 struct attribute *attr;
11056 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
11061 /* Note that we do not check for a section offset first here.
11062 This is because DW_AT_data_member_location is new in DWARF 4,
11063 so if we see it, we can assume that a constant form is really
11064 a constant and not a section offset. */
11065 if (attr_form_is_constant (attr))
11066 *offset = dwarf2_get_attr_constant_value (attr, 0);
11067 else if (attr_form_is_section_offset (attr))
11068 dwarf2_complex_location_expr_complaint ();
11069 else if (attr_form_is_block (attr))
11070 *offset = decode_locdesc (DW_BLOCK (attr), cu);
11072 dwarf2_complex_location_expr_complaint ();
11080 /* Add an aggregate field to the field list. */
11083 dwarf2_add_field (struct field_info *fip, struct die_info *die,
11084 struct dwarf2_cu *cu)
11086 struct objfile *objfile = cu->objfile;
11087 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11088 struct nextfield *new_field;
11089 struct attribute *attr;
11091 const char *fieldname = "";
11093 /* Allocate a new field list entry and link it in. */
11094 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
11095 make_cleanup (xfree, new_field);
11096 memset (new_field, 0, sizeof (struct nextfield));
11098 if (die->tag == DW_TAG_inheritance)
11100 new_field->next = fip->baseclasses;
11101 fip->baseclasses = new_field;
11105 new_field->next = fip->fields;
11106 fip->fields = new_field;
11110 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11112 new_field->accessibility = DW_UNSND (attr);
11114 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
11115 if (new_field->accessibility != DW_ACCESS_public)
11116 fip->non_public_fields = 1;
11118 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11120 new_field->virtuality = DW_UNSND (attr);
11122 new_field->virtuality = DW_VIRTUALITY_none;
11124 fp = &new_field->field;
11126 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
11130 /* Data member other than a C++ static data member. */
11132 /* Get type of field. */
11133 fp->type = die_type (die, cu);
11135 SET_FIELD_BITPOS (*fp, 0);
11137 /* Get bit size of field (zero if none). */
11138 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
11141 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
11145 FIELD_BITSIZE (*fp) = 0;
11148 /* Get bit offset of field. */
11149 if (handle_data_member_location (die, cu, &offset))
11150 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11151 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
11154 if (gdbarch_bits_big_endian (gdbarch))
11156 /* For big endian bits, the DW_AT_bit_offset gives the
11157 additional bit offset from the MSB of the containing
11158 anonymous object to the MSB of the field. We don't
11159 have to do anything special since we don't need to
11160 know the size of the anonymous object. */
11161 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
11165 /* For little endian bits, compute the bit offset to the
11166 MSB of the anonymous object, subtract off the number of
11167 bits from the MSB of the field to the MSB of the
11168 object, and then subtract off the number of bits of
11169 the field itself. The result is the bit offset of
11170 the LSB of the field. */
11171 int anonymous_size;
11172 int bit_offset = DW_UNSND (attr);
11174 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11177 /* The size of the anonymous object containing
11178 the bit field is explicit, so use the
11179 indicated size (in bytes). */
11180 anonymous_size = DW_UNSND (attr);
11184 /* The size of the anonymous object containing
11185 the bit field must be inferred from the type
11186 attribute of the data member containing the
11188 anonymous_size = TYPE_LENGTH (fp->type);
11190 SET_FIELD_BITPOS (*fp,
11191 (FIELD_BITPOS (*fp)
11192 + anonymous_size * bits_per_byte
11193 - bit_offset - FIELD_BITSIZE (*fp)));
11197 /* Get name of field. */
11198 fieldname = dwarf2_name (die, cu);
11199 if (fieldname == NULL)
11202 /* The name is already allocated along with this objfile, so we don't
11203 need to duplicate it for the type. */
11204 fp->name = fieldname;
11206 /* Change accessibility for artificial fields (e.g. virtual table
11207 pointer or virtual base class pointer) to private. */
11208 if (dwarf2_attr (die, DW_AT_artificial, cu))
11210 FIELD_ARTIFICIAL (*fp) = 1;
11211 new_field->accessibility = DW_ACCESS_private;
11212 fip->non_public_fields = 1;
11215 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
11217 /* C++ static member. */
11219 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
11220 is a declaration, but all versions of G++ as of this writing
11221 (so through at least 3.2.1) incorrectly generate
11222 DW_TAG_variable tags. */
11224 const char *physname;
11226 /* Get name of field. */
11227 fieldname = dwarf2_name (die, cu);
11228 if (fieldname == NULL)
11231 attr = dwarf2_attr (die, DW_AT_const_value, cu);
11233 /* Only create a symbol if this is an external value.
11234 new_symbol checks this and puts the value in the global symbol
11235 table, which we want. If it is not external, new_symbol
11236 will try to put the value in cu->list_in_scope which is wrong. */
11237 && dwarf2_flag_true_p (die, DW_AT_external, cu))
11239 /* A static const member, not much different than an enum as far as
11240 we're concerned, except that we can support more types. */
11241 new_symbol (die, NULL, cu);
11244 /* Get physical name. */
11245 physname = dwarf2_physname (fieldname, die, cu);
11247 /* The name is already allocated along with this objfile, so we don't
11248 need to duplicate it for the type. */
11249 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
11250 FIELD_TYPE (*fp) = die_type (die, cu);
11251 FIELD_NAME (*fp) = fieldname;
11253 else if (die->tag == DW_TAG_inheritance)
11257 /* C++ base class field. */
11258 if (handle_data_member_location (die, cu, &offset))
11259 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11260 FIELD_BITSIZE (*fp) = 0;
11261 FIELD_TYPE (*fp) = die_type (die, cu);
11262 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
11263 fip->nbaseclasses++;
11267 /* Add a typedef defined in the scope of the FIP's class. */
11270 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
11271 struct dwarf2_cu *cu)
11273 struct objfile *objfile = cu->objfile;
11274 struct typedef_field_list *new_field;
11275 struct attribute *attr;
11276 struct typedef_field *fp;
11277 char *fieldname = "";
11279 /* Allocate a new field list entry and link it in. */
11280 new_field = xzalloc (sizeof (*new_field));
11281 make_cleanup (xfree, new_field);
11283 gdb_assert (die->tag == DW_TAG_typedef);
11285 fp = &new_field->field;
11287 /* Get name of field. */
11288 fp->name = dwarf2_name (die, cu);
11289 if (fp->name == NULL)
11292 fp->type = read_type_die (die, cu);
11294 new_field->next = fip->typedef_field_list;
11295 fip->typedef_field_list = new_field;
11296 fip->typedef_field_list_count++;
11299 /* Create the vector of fields, and attach it to the type. */
11302 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
11303 struct dwarf2_cu *cu)
11305 int nfields = fip->nfields;
11307 /* Record the field count, allocate space for the array of fields,
11308 and create blank accessibility bitfields if necessary. */
11309 TYPE_NFIELDS (type) = nfields;
11310 TYPE_FIELDS (type) = (struct field *)
11311 TYPE_ALLOC (type, sizeof (struct field) * nfields);
11312 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
11314 if (fip->non_public_fields && cu->language != language_ada)
11316 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11318 TYPE_FIELD_PRIVATE_BITS (type) =
11319 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11320 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
11322 TYPE_FIELD_PROTECTED_BITS (type) =
11323 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11324 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
11326 TYPE_FIELD_IGNORE_BITS (type) =
11327 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11328 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
11331 /* If the type has baseclasses, allocate and clear a bit vector for
11332 TYPE_FIELD_VIRTUAL_BITS. */
11333 if (fip->nbaseclasses && cu->language != language_ada)
11335 int num_bytes = B_BYTES (fip->nbaseclasses);
11336 unsigned char *pointer;
11338 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11339 pointer = TYPE_ALLOC (type, num_bytes);
11340 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
11341 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
11342 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
11345 /* Copy the saved-up fields into the field vector. Start from the head of
11346 the list, adding to the tail of the field array, so that they end up in
11347 the same order in the array in which they were added to the list. */
11348 while (nfields-- > 0)
11350 struct nextfield *fieldp;
11354 fieldp = fip->fields;
11355 fip->fields = fieldp->next;
11359 fieldp = fip->baseclasses;
11360 fip->baseclasses = fieldp->next;
11363 TYPE_FIELD (type, nfields) = fieldp->field;
11364 switch (fieldp->accessibility)
11366 case DW_ACCESS_private:
11367 if (cu->language != language_ada)
11368 SET_TYPE_FIELD_PRIVATE (type, nfields);
11371 case DW_ACCESS_protected:
11372 if (cu->language != language_ada)
11373 SET_TYPE_FIELD_PROTECTED (type, nfields);
11376 case DW_ACCESS_public:
11380 /* Unknown accessibility. Complain and treat it as public. */
11382 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11383 fieldp->accessibility);
11387 if (nfields < fip->nbaseclasses)
11389 switch (fieldp->virtuality)
11391 case DW_VIRTUALITY_virtual:
11392 case DW_VIRTUALITY_pure_virtual:
11393 if (cu->language == language_ada)
11394 error (_("unexpected virtuality in component of Ada type"));
11395 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11402 /* Return true if this member function is a constructor, false
11406 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11408 const char *fieldname;
11409 const char *typename;
11412 if (die->parent == NULL)
11415 if (die->parent->tag != DW_TAG_structure_type
11416 && die->parent->tag != DW_TAG_union_type
11417 && die->parent->tag != DW_TAG_class_type)
11420 fieldname = dwarf2_name (die, cu);
11421 typename = dwarf2_name (die->parent, cu);
11422 if (fieldname == NULL || typename == NULL)
11425 len = strlen (fieldname);
11426 return (strncmp (fieldname, typename, len) == 0
11427 && (typename[len] == '\0' || typename[len] == '<'));
11430 /* Add a member function to the proper fieldlist. */
11433 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11434 struct type *type, struct dwarf2_cu *cu)
11436 struct objfile *objfile = cu->objfile;
11437 struct attribute *attr;
11438 struct fnfieldlist *flp;
11440 struct fn_field *fnp;
11441 const char *fieldname;
11442 struct nextfnfield *new_fnfield;
11443 struct type *this_type;
11444 enum dwarf_access_attribute accessibility;
11446 if (cu->language == language_ada)
11447 error (_("unexpected member function in Ada type"));
11449 /* Get name of member function. */
11450 fieldname = dwarf2_name (die, cu);
11451 if (fieldname == NULL)
11454 /* Look up member function name in fieldlist. */
11455 for (i = 0; i < fip->nfnfields; i++)
11457 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11461 /* Create new list element if necessary. */
11462 if (i < fip->nfnfields)
11463 flp = &fip->fnfieldlists[i];
11466 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11468 fip->fnfieldlists = (struct fnfieldlist *)
11469 xrealloc (fip->fnfieldlists,
11470 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11471 * sizeof (struct fnfieldlist));
11472 if (fip->nfnfields == 0)
11473 make_cleanup (free_current_contents, &fip->fnfieldlists);
11475 flp = &fip->fnfieldlists[fip->nfnfields];
11476 flp->name = fieldname;
11479 i = fip->nfnfields++;
11482 /* Create a new member function field and chain it to the field list
11484 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11485 make_cleanup (xfree, new_fnfield);
11486 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11487 new_fnfield->next = flp->head;
11488 flp->head = new_fnfield;
11491 /* Fill in the member function field info. */
11492 fnp = &new_fnfield->fnfield;
11494 /* Delay processing of the physname until later. */
11495 if (cu->language == language_cplus || cu->language == language_java)
11497 add_to_method_list (type, i, flp->length - 1, fieldname,
11502 const char *physname = dwarf2_physname (fieldname, die, cu);
11503 fnp->physname = physname ? physname : "";
11506 fnp->type = alloc_type (objfile);
11507 this_type = read_type_die (die, cu);
11508 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11510 int nparams = TYPE_NFIELDS (this_type);
11512 /* TYPE is the domain of this method, and THIS_TYPE is the type
11513 of the method itself (TYPE_CODE_METHOD). */
11514 smash_to_method_type (fnp->type, type,
11515 TYPE_TARGET_TYPE (this_type),
11516 TYPE_FIELDS (this_type),
11517 TYPE_NFIELDS (this_type),
11518 TYPE_VARARGS (this_type));
11520 /* Handle static member functions.
11521 Dwarf2 has no clean way to discern C++ static and non-static
11522 member functions. G++ helps GDB by marking the first
11523 parameter for non-static member functions (which is the this
11524 pointer) as artificial. We obtain this information from
11525 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11526 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11527 fnp->voffset = VOFFSET_STATIC;
11530 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11531 dwarf2_full_name (fieldname, die, cu));
11533 /* Get fcontext from DW_AT_containing_type if present. */
11534 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11535 fnp->fcontext = die_containing_type (die, cu);
11537 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11538 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11540 /* Get accessibility. */
11541 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11543 accessibility = DW_UNSND (attr);
11545 accessibility = dwarf2_default_access_attribute (die, cu);
11546 switch (accessibility)
11548 case DW_ACCESS_private:
11549 fnp->is_private = 1;
11551 case DW_ACCESS_protected:
11552 fnp->is_protected = 1;
11556 /* Check for artificial methods. */
11557 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11558 if (attr && DW_UNSND (attr) != 0)
11559 fnp->is_artificial = 1;
11561 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11563 /* Get index in virtual function table if it is a virtual member
11564 function. For older versions of GCC, this is an offset in the
11565 appropriate virtual table, as specified by DW_AT_containing_type.
11566 For everyone else, it is an expression to be evaluated relative
11567 to the object address. */
11569 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11572 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11574 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11576 /* Old-style GCC. */
11577 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11579 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11580 || (DW_BLOCK (attr)->size > 1
11581 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11582 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11584 struct dwarf_block blk;
11587 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11589 blk.size = DW_BLOCK (attr)->size - offset;
11590 blk.data = DW_BLOCK (attr)->data + offset;
11591 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11592 if ((fnp->voffset % cu->header.addr_size) != 0)
11593 dwarf2_complex_location_expr_complaint ();
11595 fnp->voffset /= cu->header.addr_size;
11599 dwarf2_complex_location_expr_complaint ();
11601 if (!fnp->fcontext)
11602 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11604 else if (attr_form_is_section_offset (attr))
11606 dwarf2_complex_location_expr_complaint ();
11610 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11616 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11617 if (attr && DW_UNSND (attr))
11619 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11620 complaint (&symfile_complaints,
11621 _("Member function \"%s\" (offset %d) is virtual "
11622 "but the vtable offset is not specified"),
11623 fieldname, die->offset.sect_off);
11624 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11625 TYPE_CPLUS_DYNAMIC (type) = 1;
11630 /* Create the vector of member function fields, and attach it to the type. */
11633 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11634 struct dwarf2_cu *cu)
11636 struct fnfieldlist *flp;
11639 if (cu->language == language_ada)
11640 error (_("unexpected member functions in Ada type"));
11642 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11643 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11644 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11646 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11648 struct nextfnfield *nfp = flp->head;
11649 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11652 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11653 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11654 fn_flp->fn_fields = (struct fn_field *)
11655 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11656 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11657 fn_flp->fn_fields[k] = nfp->fnfield;
11660 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11663 /* Returns non-zero if NAME is the name of a vtable member in CU's
11664 language, zero otherwise. */
11666 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11668 static const char vptr[] = "_vptr";
11669 static const char vtable[] = "vtable";
11671 /* Look for the C++ and Java forms of the vtable. */
11672 if ((cu->language == language_java
11673 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11674 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11675 && is_cplus_marker (name[sizeof (vptr) - 1])))
11681 /* GCC outputs unnamed structures that are really pointers to member
11682 functions, with the ABI-specified layout. If TYPE describes
11683 such a structure, smash it into a member function type.
11685 GCC shouldn't do this; it should just output pointer to member DIEs.
11686 This is GCC PR debug/28767. */
11689 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11691 struct type *pfn_type, *domain_type, *new_type;
11693 /* Check for a structure with no name and two children. */
11694 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11697 /* Check for __pfn and __delta members. */
11698 if (TYPE_FIELD_NAME (type, 0) == NULL
11699 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11700 || TYPE_FIELD_NAME (type, 1) == NULL
11701 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11704 /* Find the type of the method. */
11705 pfn_type = TYPE_FIELD_TYPE (type, 0);
11706 if (pfn_type == NULL
11707 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11708 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11711 /* Look for the "this" argument. */
11712 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11713 if (TYPE_NFIELDS (pfn_type) == 0
11714 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11715 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11718 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11719 new_type = alloc_type (objfile);
11720 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11721 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11722 TYPE_VARARGS (pfn_type));
11723 smash_to_methodptr_type (type, new_type);
11726 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11730 producer_is_icc (struct dwarf2_cu *cu)
11732 if (!cu->checked_producer)
11733 check_producer (cu);
11735 return cu->producer_is_icc;
11738 /* Called when we find the DIE that starts a structure or union scope
11739 (definition) to create a type for the structure or union. Fill in
11740 the type's name and general properties; the members will not be
11741 processed until process_structure_scope.
11743 NOTE: we need to call these functions regardless of whether or not the
11744 DIE has a DW_AT_name attribute, since it might be an anonymous
11745 structure or union. This gets the type entered into our set of
11746 user defined types.
11748 However, if the structure is incomplete (an opaque struct/union)
11749 then suppress creating a symbol table entry for it since gdb only
11750 wants to find the one with the complete definition. Note that if
11751 it is complete, we just call new_symbol, which does it's own
11752 checking about whether the struct/union is anonymous or not (and
11753 suppresses creating a symbol table entry itself). */
11755 static struct type *
11756 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11758 struct objfile *objfile = cu->objfile;
11760 struct attribute *attr;
11763 /* If the definition of this type lives in .debug_types, read that type.
11764 Don't follow DW_AT_specification though, that will take us back up
11765 the chain and we want to go down. */
11766 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11769 type = get_DW_AT_signature_type (die, attr, cu);
11771 /* The type's CU may not be the same as CU.
11772 Ensure TYPE is recorded with CU in die_type_hash. */
11773 return set_die_type (die, type, cu);
11776 type = alloc_type (objfile);
11777 INIT_CPLUS_SPECIFIC (type);
11779 name = dwarf2_name (die, cu);
11782 if (cu->language == language_cplus
11783 || cu->language == language_java)
11785 const char *full_name = dwarf2_full_name (name, die, cu);
11787 /* dwarf2_full_name might have already finished building the DIE's
11788 type. If so, there is no need to continue. */
11789 if (get_die_type (die, cu) != NULL)
11790 return get_die_type (die, cu);
11792 TYPE_TAG_NAME (type) = full_name;
11793 if (die->tag == DW_TAG_structure_type
11794 || die->tag == DW_TAG_class_type)
11795 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11799 /* The name is already allocated along with this objfile, so
11800 we don't need to duplicate it for the type. */
11801 TYPE_TAG_NAME (type) = name;
11802 if (die->tag == DW_TAG_class_type)
11803 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11807 if (die->tag == DW_TAG_structure_type)
11809 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11811 else if (die->tag == DW_TAG_union_type)
11813 TYPE_CODE (type) = TYPE_CODE_UNION;
11817 TYPE_CODE (type) = TYPE_CODE_CLASS;
11820 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11821 TYPE_DECLARED_CLASS (type) = 1;
11823 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11826 TYPE_LENGTH (type) = DW_UNSND (attr);
11830 TYPE_LENGTH (type) = 0;
11833 if (producer_is_icc (cu))
11835 /* ICC does not output the required DW_AT_declaration
11836 on incomplete types, but gives them a size of zero. */
11839 TYPE_STUB_SUPPORTED (type) = 1;
11841 if (die_is_declaration (die, cu))
11842 TYPE_STUB (type) = 1;
11843 else if (attr == NULL && die->child == NULL
11844 && producer_is_realview (cu->producer))
11845 /* RealView does not output the required DW_AT_declaration
11846 on incomplete types. */
11847 TYPE_STUB (type) = 1;
11849 /* We need to add the type field to the die immediately so we don't
11850 infinitely recurse when dealing with pointers to the structure
11851 type within the structure itself. */
11852 set_die_type (die, type, cu);
11854 /* set_die_type should be already done. */
11855 set_descriptive_type (type, die, cu);
11860 /* Finish creating a structure or union type, including filling in
11861 its members and creating a symbol for it. */
11864 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11866 struct objfile *objfile = cu->objfile;
11867 struct die_info *child_die = die->child;
11870 type = get_die_type (die, cu);
11872 type = read_structure_type (die, cu);
11874 if (die->child != NULL && ! die_is_declaration (die, cu))
11876 struct field_info fi;
11877 struct die_info *child_die;
11878 VEC (symbolp) *template_args = NULL;
11879 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11881 memset (&fi, 0, sizeof (struct field_info));
11883 child_die = die->child;
11885 while (child_die && child_die->tag)
11887 if (child_die->tag == DW_TAG_member
11888 || child_die->tag == DW_TAG_variable)
11890 /* NOTE: carlton/2002-11-05: A C++ static data member
11891 should be a DW_TAG_member that is a declaration, but
11892 all versions of G++ as of this writing (so through at
11893 least 3.2.1) incorrectly generate DW_TAG_variable
11894 tags for them instead. */
11895 dwarf2_add_field (&fi, child_die, cu);
11897 else if (child_die->tag == DW_TAG_subprogram)
11899 /* C++ member function. */
11900 dwarf2_add_member_fn (&fi, child_die, type, cu);
11902 else if (child_die->tag == DW_TAG_inheritance)
11904 /* C++ base class field. */
11905 dwarf2_add_field (&fi, child_die, cu);
11907 else if (child_die->tag == DW_TAG_typedef)
11908 dwarf2_add_typedef (&fi, child_die, cu);
11909 else if (child_die->tag == DW_TAG_template_type_param
11910 || child_die->tag == DW_TAG_template_value_param)
11912 struct symbol *arg = new_symbol (child_die, NULL, cu);
11915 VEC_safe_push (symbolp, template_args, arg);
11918 child_die = sibling_die (child_die);
11921 /* Attach template arguments to type. */
11922 if (! VEC_empty (symbolp, template_args))
11924 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11925 TYPE_N_TEMPLATE_ARGUMENTS (type)
11926 = VEC_length (symbolp, template_args);
11927 TYPE_TEMPLATE_ARGUMENTS (type)
11928 = obstack_alloc (&objfile->objfile_obstack,
11929 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11930 * sizeof (struct symbol *)));
11931 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11932 VEC_address (symbolp, template_args),
11933 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11934 * sizeof (struct symbol *)));
11935 VEC_free (symbolp, template_args);
11938 /* Attach fields and member functions to the type. */
11940 dwarf2_attach_fields_to_type (&fi, type, cu);
11943 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11945 /* Get the type which refers to the base class (possibly this
11946 class itself) which contains the vtable pointer for the current
11947 class from the DW_AT_containing_type attribute. This use of
11948 DW_AT_containing_type is a GNU extension. */
11950 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11952 struct type *t = die_containing_type (die, cu);
11954 TYPE_VPTR_BASETYPE (type) = t;
11959 /* Our own class provides vtbl ptr. */
11960 for (i = TYPE_NFIELDS (t) - 1;
11961 i >= TYPE_N_BASECLASSES (t);
11964 const char *fieldname = TYPE_FIELD_NAME (t, i);
11966 if (is_vtable_name (fieldname, cu))
11968 TYPE_VPTR_FIELDNO (type) = i;
11973 /* Complain if virtual function table field not found. */
11974 if (i < TYPE_N_BASECLASSES (t))
11975 complaint (&symfile_complaints,
11976 _("virtual function table pointer "
11977 "not found when defining class '%s'"),
11978 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
11983 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
11986 else if (cu->producer
11987 && strncmp (cu->producer,
11988 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
11990 /* The IBM XLC compiler does not provide direct indication
11991 of the containing type, but the vtable pointer is
11992 always named __vfp. */
11996 for (i = TYPE_NFIELDS (type) - 1;
11997 i >= TYPE_N_BASECLASSES (type);
12000 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
12002 TYPE_VPTR_FIELDNO (type) = i;
12003 TYPE_VPTR_BASETYPE (type) = type;
12010 /* Copy fi.typedef_field_list linked list elements content into the
12011 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
12012 if (fi.typedef_field_list)
12014 int i = fi.typedef_field_list_count;
12016 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12017 TYPE_TYPEDEF_FIELD_ARRAY (type)
12018 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
12019 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
12021 /* Reverse the list order to keep the debug info elements order. */
12024 struct typedef_field *dest, *src;
12026 dest = &TYPE_TYPEDEF_FIELD (type, i);
12027 src = &fi.typedef_field_list->field;
12028 fi.typedef_field_list = fi.typedef_field_list->next;
12033 do_cleanups (back_to);
12035 if (HAVE_CPLUS_STRUCT (type))
12036 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
12039 quirk_gcc_member_function_pointer (type, objfile);
12041 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
12042 snapshots) has been known to create a die giving a declaration
12043 for a class that has, as a child, a die giving a definition for a
12044 nested class. So we have to process our children even if the
12045 current die is a declaration. Normally, of course, a declaration
12046 won't have any children at all. */
12048 while (child_die != NULL && child_die->tag)
12050 if (child_die->tag == DW_TAG_member
12051 || child_die->tag == DW_TAG_variable
12052 || child_die->tag == DW_TAG_inheritance
12053 || child_die->tag == DW_TAG_template_value_param
12054 || child_die->tag == DW_TAG_template_type_param)
12059 process_die (child_die, cu);
12061 child_die = sibling_die (child_die);
12064 /* Do not consider external references. According to the DWARF standard,
12065 these DIEs are identified by the fact that they have no byte_size
12066 attribute, and a declaration attribute. */
12067 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
12068 || !die_is_declaration (die, cu))
12069 new_symbol (die, type, cu);
12072 /* Given a DW_AT_enumeration_type die, set its type. We do not
12073 complete the type's fields yet, or create any symbols. */
12075 static struct type *
12076 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
12078 struct objfile *objfile = cu->objfile;
12080 struct attribute *attr;
12083 /* If the definition of this type lives in .debug_types, read that type.
12084 Don't follow DW_AT_specification though, that will take us back up
12085 the chain and we want to go down. */
12086 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12089 type = get_DW_AT_signature_type (die, attr, cu);
12091 /* The type's CU may not be the same as CU.
12092 Ensure TYPE is recorded with CU in die_type_hash. */
12093 return set_die_type (die, type, cu);
12096 type = alloc_type (objfile);
12098 TYPE_CODE (type) = TYPE_CODE_ENUM;
12099 name = dwarf2_full_name (NULL, die, cu);
12101 TYPE_TAG_NAME (type) = name;
12103 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12106 TYPE_LENGTH (type) = DW_UNSND (attr);
12110 TYPE_LENGTH (type) = 0;
12113 /* The enumeration DIE can be incomplete. In Ada, any type can be
12114 declared as private in the package spec, and then defined only
12115 inside the package body. Such types are known as Taft Amendment
12116 Types. When another package uses such a type, an incomplete DIE
12117 may be generated by the compiler. */
12118 if (die_is_declaration (die, cu))
12119 TYPE_STUB (type) = 1;
12121 return set_die_type (die, type, cu);
12124 /* Given a pointer to a die which begins an enumeration, process all
12125 the dies that define the members of the enumeration, and create the
12126 symbol for the enumeration type.
12128 NOTE: We reverse the order of the element list. */
12131 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
12133 struct type *this_type;
12135 this_type = get_die_type (die, cu);
12136 if (this_type == NULL)
12137 this_type = read_enumeration_type (die, cu);
12139 if (die->child != NULL)
12141 struct die_info *child_die;
12142 struct symbol *sym;
12143 struct field *fields = NULL;
12144 int num_fields = 0;
12145 int unsigned_enum = 1;
12150 child_die = die->child;
12151 while (child_die && child_die->tag)
12153 if (child_die->tag != DW_TAG_enumerator)
12155 process_die (child_die, cu);
12159 name = dwarf2_name (child_die, cu);
12162 sym = new_symbol (child_die, this_type, cu);
12163 if (SYMBOL_VALUE (sym) < 0)
12168 else if ((mask & SYMBOL_VALUE (sym)) != 0)
12171 mask |= SYMBOL_VALUE (sym);
12173 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
12175 fields = (struct field *)
12177 (num_fields + DW_FIELD_ALLOC_CHUNK)
12178 * sizeof (struct field));
12181 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
12182 FIELD_TYPE (fields[num_fields]) = NULL;
12183 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
12184 FIELD_BITSIZE (fields[num_fields]) = 0;
12190 child_die = sibling_die (child_die);
12195 TYPE_NFIELDS (this_type) = num_fields;
12196 TYPE_FIELDS (this_type) = (struct field *)
12197 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
12198 memcpy (TYPE_FIELDS (this_type), fields,
12199 sizeof (struct field) * num_fields);
12203 TYPE_UNSIGNED (this_type) = 1;
12205 TYPE_FLAG_ENUM (this_type) = 1;
12208 /* If we are reading an enum from a .debug_types unit, and the enum
12209 is a declaration, and the enum is not the signatured type in the
12210 unit, then we do not want to add a symbol for it. Adding a
12211 symbol would in some cases obscure the true definition of the
12212 enum, giving users an incomplete type when the definition is
12213 actually available. Note that we do not want to do this for all
12214 enums which are just declarations, because C++0x allows forward
12215 enum declarations. */
12216 if (cu->per_cu->is_debug_types
12217 && die_is_declaration (die, cu))
12219 struct signatured_type *sig_type;
12221 sig_type = (struct signatured_type *) cu->per_cu;
12222 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
12223 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
12227 new_symbol (die, this_type, cu);
12230 /* Extract all information from a DW_TAG_array_type DIE and put it in
12231 the DIE's type field. For now, this only handles one dimensional
12234 static struct type *
12235 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
12237 struct objfile *objfile = cu->objfile;
12238 struct die_info *child_die;
12240 struct type *element_type, *range_type, *index_type;
12241 struct type **range_types = NULL;
12242 struct attribute *attr;
12244 struct cleanup *back_to;
12247 element_type = die_type (die, cu);
12249 /* The die_type call above may have already set the type for this DIE. */
12250 type = get_die_type (die, cu);
12254 /* Irix 6.2 native cc creates array types without children for
12255 arrays with unspecified length. */
12256 if (die->child == NULL)
12258 index_type = objfile_type (objfile)->builtin_int;
12259 range_type = create_range_type (NULL, index_type, 0, -1);
12260 type = create_array_type (NULL, element_type, range_type);
12261 return set_die_type (die, type, cu);
12264 back_to = make_cleanup (null_cleanup, NULL);
12265 child_die = die->child;
12266 while (child_die && child_die->tag)
12268 if (child_die->tag == DW_TAG_subrange_type)
12270 struct type *child_type = read_type_die (child_die, cu);
12272 if (child_type != NULL)
12274 /* The range type was succesfully read. Save it for the
12275 array type creation. */
12276 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
12278 range_types = (struct type **)
12279 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
12280 * sizeof (struct type *));
12282 make_cleanup (free_current_contents, &range_types);
12284 range_types[ndim++] = child_type;
12287 child_die = sibling_die (child_die);
12290 /* Dwarf2 dimensions are output from left to right, create the
12291 necessary array types in backwards order. */
12293 type = element_type;
12295 if (read_array_order (die, cu) == DW_ORD_col_major)
12300 type = create_array_type (NULL, type, range_types[i++]);
12305 type = create_array_type (NULL, type, range_types[ndim]);
12308 /* Understand Dwarf2 support for vector types (like they occur on
12309 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
12310 array type. This is not part of the Dwarf2/3 standard yet, but a
12311 custom vendor extension. The main difference between a regular
12312 array and the vector variant is that vectors are passed by value
12314 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
12316 make_vector_type (type);
12318 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
12319 implementation may choose to implement triple vectors using this
12321 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12324 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
12325 TYPE_LENGTH (type) = DW_UNSND (attr);
12327 complaint (&symfile_complaints,
12328 _("DW_AT_byte_size for array type smaller "
12329 "than the total size of elements"));
12332 name = dwarf2_name (die, cu);
12334 TYPE_NAME (type) = name;
12336 /* Install the type in the die. */
12337 set_die_type (die, type, cu);
12339 /* set_die_type should be already done. */
12340 set_descriptive_type (type, die, cu);
12342 do_cleanups (back_to);
12347 static enum dwarf_array_dim_ordering
12348 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
12350 struct attribute *attr;
12352 attr = dwarf2_attr (die, DW_AT_ordering, cu);
12354 if (attr) return DW_SND (attr);
12356 /* GNU F77 is a special case, as at 08/2004 array type info is the
12357 opposite order to the dwarf2 specification, but data is still
12358 laid out as per normal fortran.
12360 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
12361 version checking. */
12363 if (cu->language == language_fortran
12364 && cu->producer && strstr (cu->producer, "GNU F77"))
12366 return DW_ORD_row_major;
12369 switch (cu->language_defn->la_array_ordering)
12371 case array_column_major:
12372 return DW_ORD_col_major;
12373 case array_row_major:
12375 return DW_ORD_row_major;
12379 /* Extract all information from a DW_TAG_set_type DIE and put it in
12380 the DIE's type field. */
12382 static struct type *
12383 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12385 struct type *domain_type, *set_type;
12386 struct attribute *attr;
12388 domain_type = die_type (die, cu);
12390 /* The die_type call above may have already set the type for this DIE. */
12391 set_type = get_die_type (die, cu);
12395 set_type = create_set_type (NULL, domain_type);
12397 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12399 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12401 return set_die_type (die, set_type, cu);
12404 /* A helper for read_common_block that creates a locexpr baton.
12405 SYM is the symbol which we are marking as computed.
12406 COMMON_DIE is the DIE for the common block.
12407 COMMON_LOC is the location expression attribute for the common
12409 MEMBER_LOC is the location expression attribute for the particular
12410 member of the common block that we are processing.
12411 CU is the CU from which the above come. */
12414 mark_common_block_symbol_computed (struct symbol *sym,
12415 struct die_info *common_die,
12416 struct attribute *common_loc,
12417 struct attribute *member_loc,
12418 struct dwarf2_cu *cu)
12420 struct objfile *objfile = dwarf2_per_objfile->objfile;
12421 struct dwarf2_locexpr_baton *baton;
12423 unsigned int cu_off;
12424 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12425 LONGEST offset = 0;
12427 gdb_assert (common_loc && member_loc);
12428 gdb_assert (attr_form_is_block (common_loc));
12429 gdb_assert (attr_form_is_block (member_loc)
12430 || attr_form_is_constant (member_loc));
12432 baton = obstack_alloc (&objfile->objfile_obstack,
12433 sizeof (struct dwarf2_locexpr_baton));
12434 baton->per_cu = cu->per_cu;
12435 gdb_assert (baton->per_cu);
12437 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12439 if (attr_form_is_constant (member_loc))
12441 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12442 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12445 baton->size += DW_BLOCK (member_loc)->size;
12447 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12450 *ptr++ = DW_OP_call4;
12451 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12452 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12455 if (attr_form_is_constant (member_loc))
12457 *ptr++ = DW_OP_addr;
12458 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12459 ptr += cu->header.addr_size;
12463 /* We have to copy the data here, because DW_OP_call4 will only
12464 use a DW_AT_location attribute. */
12465 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12466 ptr += DW_BLOCK (member_loc)->size;
12469 *ptr++ = DW_OP_plus;
12470 gdb_assert (ptr - baton->data == baton->size);
12472 SYMBOL_LOCATION_BATON (sym) = baton;
12473 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12476 /* Create appropriate locally-scoped variables for all the
12477 DW_TAG_common_block entries. Also create a struct common_block
12478 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12479 is used to sepate the common blocks name namespace from regular
12483 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12485 struct attribute *attr;
12487 attr = dwarf2_attr (die, DW_AT_location, cu);
12490 /* Support the .debug_loc offsets. */
12491 if (attr_form_is_block (attr))
12495 else if (attr_form_is_section_offset (attr))
12497 dwarf2_complex_location_expr_complaint ();
12502 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12503 "common block member");
12508 if (die->child != NULL)
12510 struct objfile *objfile = cu->objfile;
12511 struct die_info *child_die;
12512 size_t n_entries = 0, size;
12513 struct common_block *common_block;
12514 struct symbol *sym;
12516 for (child_die = die->child;
12517 child_die && child_die->tag;
12518 child_die = sibling_die (child_die))
12521 size = (sizeof (struct common_block)
12522 + (n_entries - 1) * sizeof (struct symbol *));
12523 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12524 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12525 common_block->n_entries = 0;
12527 for (child_die = die->child;
12528 child_die && child_die->tag;
12529 child_die = sibling_die (child_die))
12531 /* Create the symbol in the DW_TAG_common_block block in the current
12533 sym = new_symbol (child_die, NULL, cu);
12536 struct attribute *member_loc;
12538 common_block->contents[common_block->n_entries++] = sym;
12540 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12544 /* GDB has handled this for a long time, but it is
12545 not specified by DWARF. It seems to have been
12546 emitted by gfortran at least as recently as:
12547 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12548 complaint (&symfile_complaints,
12549 _("Variable in common block has "
12550 "DW_AT_data_member_location "
12551 "- DIE at 0x%x [in module %s]"),
12552 child_die->offset.sect_off, cu->objfile->name);
12554 if (attr_form_is_section_offset (member_loc))
12555 dwarf2_complex_location_expr_complaint ();
12556 else if (attr_form_is_constant (member_loc)
12557 || attr_form_is_block (member_loc))
12560 mark_common_block_symbol_computed (sym, die, attr,
12564 dwarf2_complex_location_expr_complaint ();
12569 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12570 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12574 /* Create a type for a C++ namespace. */
12576 static struct type *
12577 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12579 struct objfile *objfile = cu->objfile;
12580 const char *previous_prefix, *name;
12584 /* For extensions, reuse the type of the original namespace. */
12585 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12587 struct die_info *ext_die;
12588 struct dwarf2_cu *ext_cu = cu;
12590 ext_die = dwarf2_extension (die, &ext_cu);
12591 type = read_type_die (ext_die, ext_cu);
12593 /* EXT_CU may not be the same as CU.
12594 Ensure TYPE is recorded with CU in die_type_hash. */
12595 return set_die_type (die, type, cu);
12598 name = namespace_name (die, &is_anonymous, cu);
12600 /* Now build the name of the current namespace. */
12602 previous_prefix = determine_prefix (die, cu);
12603 if (previous_prefix[0] != '\0')
12604 name = typename_concat (&objfile->objfile_obstack,
12605 previous_prefix, name, 0, cu);
12607 /* Create the type. */
12608 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12610 TYPE_NAME (type) = name;
12611 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12613 return set_die_type (die, type, cu);
12616 /* Read a C++ namespace. */
12619 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12621 struct objfile *objfile = cu->objfile;
12624 /* Add a symbol associated to this if we haven't seen the namespace
12625 before. Also, add a using directive if it's an anonymous
12628 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12632 type = read_type_die (die, cu);
12633 new_symbol (die, type, cu);
12635 namespace_name (die, &is_anonymous, cu);
12638 const char *previous_prefix = determine_prefix (die, cu);
12640 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12641 NULL, NULL, 0, &objfile->objfile_obstack);
12645 if (die->child != NULL)
12647 struct die_info *child_die = die->child;
12649 while (child_die && child_die->tag)
12651 process_die (child_die, cu);
12652 child_die = sibling_die (child_die);
12657 /* Read a Fortran module as type. This DIE can be only a declaration used for
12658 imported module. Still we need that type as local Fortran "use ... only"
12659 declaration imports depend on the created type in determine_prefix. */
12661 static struct type *
12662 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12664 struct objfile *objfile = cu->objfile;
12665 const char *module_name;
12668 module_name = dwarf2_name (die, cu);
12670 complaint (&symfile_complaints,
12671 _("DW_TAG_module has no name, offset 0x%x"),
12672 die->offset.sect_off);
12673 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12675 /* determine_prefix uses TYPE_TAG_NAME. */
12676 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12678 return set_die_type (die, type, cu);
12681 /* Read a Fortran module. */
12684 read_module (struct die_info *die, struct dwarf2_cu *cu)
12686 struct die_info *child_die = die->child;
12688 while (child_die && child_die->tag)
12690 process_die (child_die, cu);
12691 child_die = sibling_die (child_die);
12695 /* Return the name of the namespace represented by DIE. Set
12696 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12699 static const char *
12700 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12702 struct die_info *current_die;
12703 const char *name = NULL;
12705 /* Loop through the extensions until we find a name. */
12707 for (current_die = die;
12708 current_die != NULL;
12709 current_die = dwarf2_extension (die, &cu))
12711 name = dwarf2_name (current_die, cu);
12716 /* Is it an anonymous namespace? */
12718 *is_anonymous = (name == NULL);
12720 name = CP_ANONYMOUS_NAMESPACE_STR;
12725 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12726 the user defined type vector. */
12728 static struct type *
12729 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12731 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12732 struct comp_unit_head *cu_header = &cu->header;
12734 struct attribute *attr_byte_size;
12735 struct attribute *attr_address_class;
12736 int byte_size, addr_class;
12737 struct type *target_type;
12739 target_type = die_type (die, cu);
12741 /* The die_type call above may have already set the type for this DIE. */
12742 type = get_die_type (die, cu);
12746 type = lookup_pointer_type (target_type);
12748 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12749 if (attr_byte_size)
12750 byte_size = DW_UNSND (attr_byte_size);
12752 byte_size = cu_header->addr_size;
12754 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12755 if (attr_address_class)
12756 addr_class = DW_UNSND (attr_address_class);
12758 addr_class = DW_ADDR_none;
12760 /* If the pointer size or address class is different than the
12761 default, create a type variant marked as such and set the
12762 length accordingly. */
12763 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12765 if (gdbarch_address_class_type_flags_p (gdbarch))
12769 type_flags = gdbarch_address_class_type_flags
12770 (gdbarch, byte_size, addr_class);
12771 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12773 type = make_type_with_address_space (type, type_flags);
12775 else if (TYPE_LENGTH (type) != byte_size)
12777 complaint (&symfile_complaints,
12778 _("invalid pointer size %d"), byte_size);
12782 /* Should we also complain about unhandled address classes? */
12786 TYPE_LENGTH (type) = byte_size;
12787 return set_die_type (die, type, cu);
12790 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12791 the user defined type vector. */
12793 static struct type *
12794 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12797 struct type *to_type;
12798 struct type *domain;
12800 to_type = die_type (die, cu);
12801 domain = die_containing_type (die, cu);
12803 /* The calls above may have already set the type for this DIE. */
12804 type = get_die_type (die, cu);
12808 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12809 type = lookup_methodptr_type (to_type);
12810 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12812 struct type *new_type = alloc_type (cu->objfile);
12814 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12815 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12816 TYPE_VARARGS (to_type));
12817 type = lookup_methodptr_type (new_type);
12820 type = lookup_memberptr_type (to_type, domain);
12822 return set_die_type (die, type, cu);
12825 /* Extract all information from a DW_TAG_reference_type DIE and add to
12826 the user defined type vector. */
12828 static struct type *
12829 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12831 struct comp_unit_head *cu_header = &cu->header;
12832 struct type *type, *target_type;
12833 struct attribute *attr;
12835 target_type = die_type (die, cu);
12837 /* The die_type call above may have already set the type for this DIE. */
12838 type = get_die_type (die, cu);
12842 type = lookup_reference_type (target_type);
12843 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12846 TYPE_LENGTH (type) = DW_UNSND (attr);
12850 TYPE_LENGTH (type) = cu_header->addr_size;
12852 return set_die_type (die, type, cu);
12855 static struct type *
12856 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12858 struct type *base_type, *cv_type;
12860 base_type = die_type (die, cu);
12862 /* The die_type call above may have already set the type for this DIE. */
12863 cv_type = get_die_type (die, cu);
12867 /* In case the const qualifier is applied to an array type, the element type
12868 is so qualified, not the array type (section 6.7.3 of C99). */
12869 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12871 struct type *el_type, *inner_array;
12873 base_type = copy_type (base_type);
12874 inner_array = base_type;
12876 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12878 TYPE_TARGET_TYPE (inner_array) =
12879 copy_type (TYPE_TARGET_TYPE (inner_array));
12880 inner_array = TYPE_TARGET_TYPE (inner_array);
12883 el_type = TYPE_TARGET_TYPE (inner_array);
12884 TYPE_TARGET_TYPE (inner_array) =
12885 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12887 return set_die_type (die, base_type, cu);
12890 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12891 return set_die_type (die, cv_type, cu);
12894 static struct type *
12895 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12897 struct type *base_type, *cv_type;
12899 base_type = die_type (die, cu);
12901 /* The die_type call above may have already set the type for this DIE. */
12902 cv_type = get_die_type (die, cu);
12906 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12907 return set_die_type (die, cv_type, cu);
12910 /* Handle DW_TAG_restrict_type. */
12912 static struct type *
12913 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12915 struct type *base_type, *cv_type;
12917 base_type = die_type (die, cu);
12919 /* The die_type call above may have already set the type for this DIE. */
12920 cv_type = get_die_type (die, cu);
12924 cv_type = make_restrict_type (base_type);
12925 return set_die_type (die, cv_type, cu);
12928 /* Extract all information from a DW_TAG_string_type DIE and add to
12929 the user defined type vector. It isn't really a user defined type,
12930 but it behaves like one, with other DIE's using an AT_user_def_type
12931 attribute to reference it. */
12933 static struct type *
12934 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12936 struct objfile *objfile = cu->objfile;
12937 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12938 struct type *type, *range_type, *index_type, *char_type;
12939 struct attribute *attr;
12940 unsigned int length;
12942 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12945 length = DW_UNSND (attr);
12949 /* Check for the DW_AT_byte_size attribute. */
12950 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12953 length = DW_UNSND (attr);
12961 index_type = objfile_type (objfile)->builtin_int;
12962 range_type = create_range_type (NULL, index_type, 1, length);
12963 char_type = language_string_char_type (cu->language_defn, gdbarch);
12964 type = create_string_type (NULL, char_type, range_type);
12966 return set_die_type (die, type, cu);
12969 /* Assuming that DIE corresponds to a function, returns nonzero
12970 if the function is prototyped. */
12973 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
12975 struct attribute *attr;
12977 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
12978 if (attr && (DW_UNSND (attr) != 0))
12981 /* The DWARF standard implies that the DW_AT_prototyped attribute
12982 is only meaninful for C, but the concept also extends to other
12983 languages that allow unprototyped functions (Eg: Objective C).
12984 For all other languages, assume that functions are always
12986 if (cu->language != language_c
12987 && cu->language != language_objc
12988 && cu->language != language_opencl)
12991 /* RealView does not emit DW_AT_prototyped. We can not distinguish
12992 prototyped and unprototyped functions; default to prototyped,
12993 since that is more common in modern code (and RealView warns
12994 about unprototyped functions). */
12995 if (producer_is_realview (cu->producer))
13001 /* Handle DIES due to C code like:
13005 int (*funcp)(int a, long l);
13009 ('funcp' generates a DW_TAG_subroutine_type DIE). */
13011 static struct type *
13012 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
13014 struct objfile *objfile = cu->objfile;
13015 struct type *type; /* Type that this function returns. */
13016 struct type *ftype; /* Function that returns above type. */
13017 struct attribute *attr;
13019 type = die_type (die, cu);
13021 /* The die_type call above may have already set the type for this DIE. */
13022 ftype = get_die_type (die, cu);
13026 ftype = lookup_function_type (type);
13028 if (prototyped_function_p (die, cu))
13029 TYPE_PROTOTYPED (ftype) = 1;
13031 /* Store the calling convention in the type if it's available in
13032 the subroutine die. Otherwise set the calling convention to
13033 the default value DW_CC_normal. */
13034 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
13036 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
13037 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
13038 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
13040 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
13042 /* We need to add the subroutine type to the die immediately so
13043 we don't infinitely recurse when dealing with parameters
13044 declared as the same subroutine type. */
13045 set_die_type (die, ftype, cu);
13047 if (die->child != NULL)
13049 struct type *void_type = objfile_type (objfile)->builtin_void;
13050 struct die_info *child_die;
13051 int nparams, iparams;
13053 /* Count the number of parameters.
13054 FIXME: GDB currently ignores vararg functions, but knows about
13055 vararg member functions. */
13057 child_die = die->child;
13058 while (child_die && child_die->tag)
13060 if (child_die->tag == DW_TAG_formal_parameter)
13062 else if (child_die->tag == DW_TAG_unspecified_parameters)
13063 TYPE_VARARGS (ftype) = 1;
13064 child_die = sibling_die (child_die);
13067 /* Allocate storage for parameters and fill them in. */
13068 TYPE_NFIELDS (ftype) = nparams;
13069 TYPE_FIELDS (ftype) = (struct field *)
13070 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
13072 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
13073 even if we error out during the parameters reading below. */
13074 for (iparams = 0; iparams < nparams; iparams++)
13075 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
13078 child_die = die->child;
13079 while (child_die && child_die->tag)
13081 if (child_die->tag == DW_TAG_formal_parameter)
13083 struct type *arg_type;
13085 /* DWARF version 2 has no clean way to discern C++
13086 static and non-static member functions. G++ helps
13087 GDB by marking the first parameter for non-static
13088 member functions (which is the this pointer) as
13089 artificial. We pass this information to
13090 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
13092 DWARF version 3 added DW_AT_object_pointer, which GCC
13093 4.5 does not yet generate. */
13094 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
13096 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
13099 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
13101 /* GCC/43521: In java, the formal parameter
13102 "this" is sometimes not marked with DW_AT_artificial. */
13103 if (cu->language == language_java)
13105 const char *name = dwarf2_name (child_die, cu);
13107 if (name && !strcmp (name, "this"))
13108 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
13111 arg_type = die_type (child_die, cu);
13113 /* RealView does not mark THIS as const, which the testsuite
13114 expects. GCC marks THIS as const in method definitions,
13115 but not in the class specifications (GCC PR 43053). */
13116 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
13117 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
13120 struct dwarf2_cu *arg_cu = cu;
13121 const char *name = dwarf2_name (child_die, cu);
13123 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
13126 /* If the compiler emits this, use it. */
13127 if (follow_die_ref (die, attr, &arg_cu) == child_die)
13130 else if (name && strcmp (name, "this") == 0)
13131 /* Function definitions will have the argument names. */
13133 else if (name == NULL && iparams == 0)
13134 /* Declarations may not have the names, so like
13135 elsewhere in GDB, assume an artificial first
13136 argument is "this". */
13140 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
13144 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
13147 child_die = sibling_die (child_die);
13154 static struct type *
13155 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
13157 struct objfile *objfile = cu->objfile;
13158 const char *name = NULL;
13159 struct type *this_type, *target_type;
13161 name = dwarf2_full_name (NULL, die, cu);
13162 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
13163 TYPE_FLAG_TARGET_STUB, NULL, objfile);
13164 TYPE_NAME (this_type) = name;
13165 set_die_type (die, this_type, cu);
13166 target_type = die_type (die, cu);
13167 if (target_type != this_type)
13168 TYPE_TARGET_TYPE (this_type) = target_type;
13171 /* Self-referential typedefs are, it seems, not allowed by the DWARF
13172 spec and cause infinite loops in GDB. */
13173 complaint (&symfile_complaints,
13174 _("Self-referential DW_TAG_typedef "
13175 "- DIE at 0x%x [in module %s]"),
13176 die->offset.sect_off, objfile->name);
13177 TYPE_TARGET_TYPE (this_type) = NULL;
13182 /* Find a representation of a given base type and install
13183 it in the TYPE field of the die. */
13185 static struct type *
13186 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
13188 struct objfile *objfile = cu->objfile;
13190 struct attribute *attr;
13191 int encoding = 0, size = 0;
13193 enum type_code code = TYPE_CODE_INT;
13194 int type_flags = 0;
13195 struct type *target_type = NULL;
13197 attr = dwarf2_attr (die, DW_AT_encoding, cu);
13200 encoding = DW_UNSND (attr);
13202 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13205 size = DW_UNSND (attr);
13207 name = dwarf2_name (die, cu);
13210 complaint (&symfile_complaints,
13211 _("DW_AT_name missing from DW_TAG_base_type"));
13216 case DW_ATE_address:
13217 /* Turn DW_ATE_address into a void * pointer. */
13218 code = TYPE_CODE_PTR;
13219 type_flags |= TYPE_FLAG_UNSIGNED;
13220 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
13222 case DW_ATE_boolean:
13223 code = TYPE_CODE_BOOL;
13224 type_flags |= TYPE_FLAG_UNSIGNED;
13226 case DW_ATE_complex_float:
13227 code = TYPE_CODE_COMPLEX;
13228 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
13230 case DW_ATE_decimal_float:
13231 code = TYPE_CODE_DECFLOAT;
13234 code = TYPE_CODE_FLT;
13236 case DW_ATE_signed:
13238 case DW_ATE_unsigned:
13239 type_flags |= TYPE_FLAG_UNSIGNED;
13240 if (cu->language == language_fortran
13242 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
13243 code = TYPE_CODE_CHAR;
13245 case DW_ATE_signed_char:
13246 if (cu->language == language_ada || cu->language == language_m2
13247 || cu->language == language_pascal
13248 || cu->language == language_fortran)
13249 code = TYPE_CODE_CHAR;
13251 case DW_ATE_unsigned_char:
13252 if (cu->language == language_ada || cu->language == language_m2
13253 || cu->language == language_pascal
13254 || cu->language == language_fortran)
13255 code = TYPE_CODE_CHAR;
13256 type_flags |= TYPE_FLAG_UNSIGNED;
13259 /* We just treat this as an integer and then recognize the
13260 type by name elsewhere. */
13264 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
13265 dwarf_type_encoding_name (encoding));
13269 type = init_type (code, size, type_flags, NULL, objfile);
13270 TYPE_NAME (type) = name;
13271 TYPE_TARGET_TYPE (type) = target_type;
13273 if (name && strcmp (name, "char") == 0)
13274 TYPE_NOSIGN (type) = 1;
13276 return set_die_type (die, type, cu);
13279 /* Read the given DW_AT_subrange DIE. */
13281 static struct type *
13282 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
13284 struct type *base_type, *orig_base_type;
13285 struct type *range_type;
13286 struct attribute *attr;
13288 int low_default_is_valid;
13290 LONGEST negative_mask;
13292 orig_base_type = die_type (die, cu);
13293 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
13294 whereas the real type might be. So, we use ORIG_BASE_TYPE when
13295 creating the range type, but we use the result of check_typedef
13296 when examining properties of the type. */
13297 base_type = check_typedef (orig_base_type);
13299 /* The die_type call above may have already set the type for this DIE. */
13300 range_type = get_die_type (die, cu);
13304 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
13305 omitting DW_AT_lower_bound. */
13306 switch (cu->language)
13309 case language_cplus:
13311 low_default_is_valid = 1;
13313 case language_fortran:
13315 low_default_is_valid = 1;
13318 case language_java:
13319 case language_objc:
13321 low_default_is_valid = (cu->header.version >= 4);
13325 case language_pascal:
13327 low_default_is_valid = (cu->header.version >= 4);
13331 low_default_is_valid = 0;
13335 /* FIXME: For variable sized arrays either of these could be
13336 a variable rather than a constant value. We'll allow it,
13337 but we don't know how to handle it. */
13338 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
13340 low = dwarf2_get_attr_constant_value (attr, low);
13341 else if (!low_default_is_valid)
13342 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
13343 "- DIE at 0x%x [in module %s]"),
13344 die->offset.sect_off, cu->objfile->name);
13346 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
13349 if (attr_form_is_block (attr) || is_ref_attr (attr))
13351 /* GCC encodes arrays with unspecified or dynamic length
13352 with a DW_FORM_block1 attribute or a reference attribute.
13353 FIXME: GDB does not yet know how to handle dynamic
13354 arrays properly, treat them as arrays with unspecified
13357 FIXME: jimb/2003-09-22: GDB does not really know
13358 how to handle arrays of unspecified length
13359 either; we just represent them as zero-length
13360 arrays. Choose an appropriate upper bound given
13361 the lower bound we've computed above. */
13365 high = dwarf2_get_attr_constant_value (attr, 1);
13369 attr = dwarf2_attr (die, DW_AT_count, cu);
13372 int count = dwarf2_get_attr_constant_value (attr, 1);
13373 high = low + count - 1;
13377 /* Unspecified array length. */
13382 /* Dwarf-2 specifications explicitly allows to create subrange types
13383 without specifying a base type.
13384 In that case, the base type must be set to the type of
13385 the lower bound, upper bound or count, in that order, if any of these
13386 three attributes references an object that has a type.
13387 If no base type is found, the Dwarf-2 specifications say that
13388 a signed integer type of size equal to the size of an address should
13390 For the following C code: `extern char gdb_int [];'
13391 GCC produces an empty range DIE.
13392 FIXME: muller/2010-05-28: Possible references to object for low bound,
13393 high bound or count are not yet handled by this code. */
13394 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
13396 struct objfile *objfile = cu->objfile;
13397 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13398 int addr_size = gdbarch_addr_bit (gdbarch) /8;
13399 struct type *int_type = objfile_type (objfile)->builtin_int;
13401 /* Test "int", "long int", and "long long int" objfile types,
13402 and select the first one having a size above or equal to the
13403 architecture address size. */
13404 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13405 base_type = int_type;
13408 int_type = objfile_type (objfile)->builtin_long;
13409 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13410 base_type = int_type;
13413 int_type = objfile_type (objfile)->builtin_long_long;
13414 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13415 base_type = int_type;
13421 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13422 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13423 low |= negative_mask;
13424 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13425 high |= negative_mask;
13427 range_type = create_range_type (NULL, orig_base_type, low, high);
13429 /* Mark arrays with dynamic length at least as an array of unspecified
13430 length. GDB could check the boundary but before it gets implemented at
13431 least allow accessing the array elements. */
13432 if (attr && attr_form_is_block (attr))
13433 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13435 /* Ada expects an empty array on no boundary attributes. */
13436 if (attr == NULL && cu->language != language_ada)
13437 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13439 name = dwarf2_name (die, cu);
13441 TYPE_NAME (range_type) = name;
13443 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13445 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13447 set_die_type (die, range_type, cu);
13449 /* set_die_type should be already done. */
13450 set_descriptive_type (range_type, die, cu);
13455 static struct type *
13456 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13460 /* For now, we only support the C meaning of an unspecified type: void. */
13462 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13463 TYPE_NAME (type) = dwarf2_name (die, cu);
13465 return set_die_type (die, type, cu);
13468 /* Read a single die and all its descendents. Set the die's sibling
13469 field to NULL; set other fields in the die correctly, and set all
13470 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13471 location of the info_ptr after reading all of those dies. PARENT
13472 is the parent of the die in question. */
13474 static struct die_info *
13475 read_die_and_children (const struct die_reader_specs *reader,
13476 const gdb_byte *info_ptr,
13477 const gdb_byte **new_info_ptr,
13478 struct die_info *parent)
13480 struct die_info *die;
13481 const gdb_byte *cur_ptr;
13484 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13487 *new_info_ptr = cur_ptr;
13490 store_in_ref_table (die, reader->cu);
13493 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13497 *new_info_ptr = cur_ptr;
13500 die->sibling = NULL;
13501 die->parent = parent;
13505 /* Read a die, all of its descendents, and all of its siblings; set
13506 all of the fields of all of the dies correctly. Arguments are as
13507 in read_die_and_children. */
13509 static struct die_info *
13510 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13511 const gdb_byte *info_ptr,
13512 const gdb_byte **new_info_ptr,
13513 struct die_info *parent)
13515 struct die_info *first_die, *last_sibling;
13516 const gdb_byte *cur_ptr;
13518 cur_ptr = info_ptr;
13519 first_die = last_sibling = NULL;
13523 struct die_info *die
13524 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13528 *new_info_ptr = cur_ptr;
13535 last_sibling->sibling = die;
13537 last_sibling = die;
13541 /* Read a die, all of its descendents, and all of its siblings; set
13542 all of the fields of all of the dies correctly. Arguments are as
13543 in read_die_and_children.
13544 This the main entry point for reading a DIE and all its children. */
13546 static struct die_info *
13547 read_die_and_siblings (const struct die_reader_specs *reader,
13548 const gdb_byte *info_ptr,
13549 const gdb_byte **new_info_ptr,
13550 struct die_info *parent)
13552 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13553 new_info_ptr, parent);
13555 if (dwarf2_die_debug)
13557 fprintf_unfiltered (gdb_stdlog,
13558 "Read die from %s@0x%x of %s:\n",
13559 bfd_section_name (reader->abfd,
13560 reader->die_section->asection),
13561 (unsigned) (info_ptr - reader->die_section->buffer),
13562 bfd_get_filename (reader->abfd));
13563 dump_die (die, dwarf2_die_debug);
13569 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13571 The caller is responsible for filling in the extra attributes
13572 and updating (*DIEP)->num_attrs.
13573 Set DIEP to point to a newly allocated die with its information,
13574 except for its child, sibling, and parent fields.
13575 Set HAS_CHILDREN to tell whether the die has children or not. */
13577 static const gdb_byte *
13578 read_full_die_1 (const struct die_reader_specs *reader,
13579 struct die_info **diep, const gdb_byte *info_ptr,
13580 int *has_children, int num_extra_attrs)
13582 unsigned int abbrev_number, bytes_read, i;
13583 sect_offset offset;
13584 struct abbrev_info *abbrev;
13585 struct die_info *die;
13586 struct dwarf2_cu *cu = reader->cu;
13587 bfd *abfd = reader->abfd;
13589 offset.sect_off = info_ptr - reader->buffer;
13590 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13591 info_ptr += bytes_read;
13592 if (!abbrev_number)
13599 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13601 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13603 bfd_get_filename (abfd));
13605 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13606 die->offset = offset;
13607 die->tag = abbrev->tag;
13608 die->abbrev = abbrev_number;
13610 /* Make the result usable.
13611 The caller needs to update num_attrs after adding the extra
13613 die->num_attrs = abbrev->num_attrs;
13615 for (i = 0; i < abbrev->num_attrs; ++i)
13616 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13620 *has_children = abbrev->has_children;
13624 /* Read a die and all its attributes.
13625 Set DIEP to point to a newly allocated die with its information,
13626 except for its child, sibling, and parent fields.
13627 Set HAS_CHILDREN to tell whether the die has children or not. */
13629 static const gdb_byte *
13630 read_full_die (const struct die_reader_specs *reader,
13631 struct die_info **diep, const gdb_byte *info_ptr,
13634 const gdb_byte *result;
13636 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13638 if (dwarf2_die_debug)
13640 fprintf_unfiltered (gdb_stdlog,
13641 "Read die from %s@0x%x of %s:\n",
13642 bfd_section_name (reader->abfd,
13643 reader->die_section->asection),
13644 (unsigned) (info_ptr - reader->die_section->buffer),
13645 bfd_get_filename (reader->abfd));
13646 dump_die (*diep, dwarf2_die_debug);
13652 /* Abbreviation tables.
13654 In DWARF version 2, the description of the debugging information is
13655 stored in a separate .debug_abbrev section. Before we read any
13656 dies from a section we read in all abbreviations and install them
13657 in a hash table. */
13659 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13661 static struct abbrev_info *
13662 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13664 struct abbrev_info *abbrev;
13666 abbrev = (struct abbrev_info *)
13667 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13668 memset (abbrev, 0, sizeof (struct abbrev_info));
13672 /* Add an abbreviation to the table. */
13675 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13676 unsigned int abbrev_number,
13677 struct abbrev_info *abbrev)
13679 unsigned int hash_number;
13681 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13682 abbrev->next = abbrev_table->abbrevs[hash_number];
13683 abbrev_table->abbrevs[hash_number] = abbrev;
13686 /* Look up an abbrev in the table.
13687 Returns NULL if the abbrev is not found. */
13689 static struct abbrev_info *
13690 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13691 unsigned int abbrev_number)
13693 unsigned int hash_number;
13694 struct abbrev_info *abbrev;
13696 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13697 abbrev = abbrev_table->abbrevs[hash_number];
13701 if (abbrev->number == abbrev_number)
13703 abbrev = abbrev->next;
13708 /* Read in an abbrev table. */
13710 static struct abbrev_table *
13711 abbrev_table_read_table (struct dwarf2_section_info *section,
13712 sect_offset offset)
13714 struct objfile *objfile = dwarf2_per_objfile->objfile;
13715 bfd *abfd = section->asection->owner;
13716 struct abbrev_table *abbrev_table;
13717 const gdb_byte *abbrev_ptr;
13718 struct abbrev_info *cur_abbrev;
13719 unsigned int abbrev_number, bytes_read, abbrev_name;
13720 unsigned int abbrev_form;
13721 struct attr_abbrev *cur_attrs;
13722 unsigned int allocated_attrs;
13724 abbrev_table = XMALLOC (struct abbrev_table);
13725 abbrev_table->offset = offset;
13726 obstack_init (&abbrev_table->abbrev_obstack);
13727 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13729 * sizeof (struct abbrev_info *)));
13730 memset (abbrev_table->abbrevs, 0,
13731 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13733 dwarf2_read_section (objfile, section);
13734 abbrev_ptr = section->buffer + offset.sect_off;
13735 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13736 abbrev_ptr += bytes_read;
13738 allocated_attrs = ATTR_ALLOC_CHUNK;
13739 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13741 /* Loop until we reach an abbrev number of 0. */
13742 while (abbrev_number)
13744 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13746 /* read in abbrev header */
13747 cur_abbrev->number = abbrev_number;
13748 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13749 abbrev_ptr += bytes_read;
13750 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13753 /* now read in declarations */
13754 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13755 abbrev_ptr += bytes_read;
13756 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13757 abbrev_ptr += bytes_read;
13758 while (abbrev_name)
13760 if (cur_abbrev->num_attrs == allocated_attrs)
13762 allocated_attrs += ATTR_ALLOC_CHUNK;
13764 = xrealloc (cur_attrs, (allocated_attrs
13765 * sizeof (struct attr_abbrev)));
13768 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13769 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13770 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13771 abbrev_ptr += bytes_read;
13772 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13773 abbrev_ptr += bytes_read;
13776 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13777 (cur_abbrev->num_attrs
13778 * sizeof (struct attr_abbrev)));
13779 memcpy (cur_abbrev->attrs, cur_attrs,
13780 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13782 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13784 /* Get next abbreviation.
13785 Under Irix6 the abbreviations for a compilation unit are not
13786 always properly terminated with an abbrev number of 0.
13787 Exit loop if we encounter an abbreviation which we have
13788 already read (which means we are about to read the abbreviations
13789 for the next compile unit) or if the end of the abbreviation
13790 table is reached. */
13791 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13793 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13794 abbrev_ptr += bytes_read;
13795 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13800 return abbrev_table;
13803 /* Free the resources held by ABBREV_TABLE. */
13806 abbrev_table_free (struct abbrev_table *abbrev_table)
13808 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13809 xfree (abbrev_table);
13812 /* Same as abbrev_table_free but as a cleanup.
13813 We pass in a pointer to the pointer to the table so that we can
13814 set the pointer to NULL when we're done. It also simplifies
13815 build_type_unit_groups. */
13818 abbrev_table_free_cleanup (void *table_ptr)
13820 struct abbrev_table **abbrev_table_ptr = table_ptr;
13822 if (*abbrev_table_ptr != NULL)
13823 abbrev_table_free (*abbrev_table_ptr);
13824 *abbrev_table_ptr = NULL;
13827 /* Read the abbrev table for CU from ABBREV_SECTION. */
13830 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13831 struct dwarf2_section_info *abbrev_section)
13834 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13837 /* Release the memory used by the abbrev table for a compilation unit. */
13840 dwarf2_free_abbrev_table (void *ptr_to_cu)
13842 struct dwarf2_cu *cu = ptr_to_cu;
13844 if (cu->abbrev_table != NULL)
13845 abbrev_table_free (cu->abbrev_table);
13846 /* Set this to NULL so that we SEGV if we try to read it later,
13847 and also because free_comp_unit verifies this is NULL. */
13848 cu->abbrev_table = NULL;
13851 /* Returns nonzero if TAG represents a type that we might generate a partial
13855 is_type_tag_for_partial (int tag)
13860 /* Some types that would be reasonable to generate partial symbols for,
13861 that we don't at present. */
13862 case DW_TAG_array_type:
13863 case DW_TAG_file_type:
13864 case DW_TAG_ptr_to_member_type:
13865 case DW_TAG_set_type:
13866 case DW_TAG_string_type:
13867 case DW_TAG_subroutine_type:
13869 case DW_TAG_base_type:
13870 case DW_TAG_class_type:
13871 case DW_TAG_interface_type:
13872 case DW_TAG_enumeration_type:
13873 case DW_TAG_structure_type:
13874 case DW_TAG_subrange_type:
13875 case DW_TAG_typedef:
13876 case DW_TAG_union_type:
13883 /* Load all DIEs that are interesting for partial symbols into memory. */
13885 static struct partial_die_info *
13886 load_partial_dies (const struct die_reader_specs *reader,
13887 const gdb_byte *info_ptr, int building_psymtab)
13889 struct dwarf2_cu *cu = reader->cu;
13890 struct objfile *objfile = cu->objfile;
13891 struct partial_die_info *part_die;
13892 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13893 struct abbrev_info *abbrev;
13894 unsigned int bytes_read;
13895 unsigned int load_all = 0;
13896 int nesting_level = 1;
13901 gdb_assert (cu->per_cu != NULL);
13902 if (cu->per_cu->load_all_dies)
13906 = htab_create_alloc_ex (cu->header.length / 12,
13910 &cu->comp_unit_obstack,
13911 hashtab_obstack_allocate,
13912 dummy_obstack_deallocate);
13914 part_die = obstack_alloc (&cu->comp_unit_obstack,
13915 sizeof (struct partial_die_info));
13919 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13921 /* A NULL abbrev means the end of a series of children. */
13922 if (abbrev == NULL)
13924 if (--nesting_level == 0)
13926 /* PART_DIE was probably the last thing allocated on the
13927 comp_unit_obstack, so we could call obstack_free
13928 here. We don't do that because the waste is small,
13929 and will be cleaned up when we're done with this
13930 compilation unit. This way, we're also more robust
13931 against other users of the comp_unit_obstack. */
13934 info_ptr += bytes_read;
13935 last_die = parent_die;
13936 parent_die = parent_die->die_parent;
13940 /* Check for template arguments. We never save these; if
13941 they're seen, we just mark the parent, and go on our way. */
13942 if (parent_die != NULL
13943 && cu->language == language_cplus
13944 && (abbrev->tag == DW_TAG_template_type_param
13945 || abbrev->tag == DW_TAG_template_value_param))
13947 parent_die->has_template_arguments = 1;
13951 /* We don't need a partial DIE for the template argument. */
13952 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13957 /* We only recurse into c++ subprograms looking for template arguments.
13958 Skip their other children. */
13960 && cu->language == language_cplus
13961 && parent_die != NULL
13962 && parent_die->tag == DW_TAG_subprogram)
13964 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13968 /* Check whether this DIE is interesting enough to save. Normally
13969 we would not be interested in members here, but there may be
13970 later variables referencing them via DW_AT_specification (for
13971 static members). */
13973 && !is_type_tag_for_partial (abbrev->tag)
13974 && abbrev->tag != DW_TAG_constant
13975 && abbrev->tag != DW_TAG_enumerator
13976 && abbrev->tag != DW_TAG_subprogram
13977 && abbrev->tag != DW_TAG_lexical_block
13978 && abbrev->tag != DW_TAG_variable
13979 && abbrev->tag != DW_TAG_namespace
13980 && abbrev->tag != DW_TAG_module
13981 && abbrev->tag != DW_TAG_member
13982 && abbrev->tag != DW_TAG_imported_unit)
13984 /* Otherwise we skip to the next sibling, if any. */
13985 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13989 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
13992 /* This two-pass algorithm for processing partial symbols has a
13993 high cost in cache pressure. Thus, handle some simple cases
13994 here which cover the majority of C partial symbols. DIEs
13995 which neither have specification tags in them, nor could have
13996 specification tags elsewhere pointing at them, can simply be
13997 processed and discarded.
13999 This segment is also optional; scan_partial_symbols and
14000 add_partial_symbol will handle these DIEs if we chain
14001 them in normally. When compilers which do not emit large
14002 quantities of duplicate debug information are more common,
14003 this code can probably be removed. */
14005 /* Any complete simple types at the top level (pretty much all
14006 of them, for a language without namespaces), can be processed
14008 if (parent_die == NULL
14009 && part_die->has_specification == 0
14010 && part_die->is_declaration == 0
14011 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
14012 || part_die->tag == DW_TAG_base_type
14013 || part_die->tag == DW_TAG_subrange_type))
14015 if (building_psymtab && part_die->name != NULL)
14016 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14017 VAR_DOMAIN, LOC_TYPEDEF,
14018 &objfile->static_psymbols,
14019 0, (CORE_ADDR) 0, cu->language, objfile);
14020 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14024 /* The exception for DW_TAG_typedef with has_children above is
14025 a workaround of GCC PR debug/47510. In the case of this complaint
14026 type_name_no_tag_or_error will error on such types later.
14028 GDB skipped children of DW_TAG_typedef by the shortcut above and then
14029 it could not find the child DIEs referenced later, this is checked
14030 above. In correct DWARF DW_TAG_typedef should have no children. */
14032 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
14033 complaint (&symfile_complaints,
14034 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
14035 "- DIE at 0x%x [in module %s]"),
14036 part_die->offset.sect_off, objfile->name);
14038 /* If we're at the second level, and we're an enumerator, and
14039 our parent has no specification (meaning possibly lives in a
14040 namespace elsewhere), then we can add the partial symbol now
14041 instead of queueing it. */
14042 if (part_die->tag == DW_TAG_enumerator
14043 && parent_die != NULL
14044 && parent_die->die_parent == NULL
14045 && parent_die->tag == DW_TAG_enumeration_type
14046 && parent_die->has_specification == 0)
14048 if (part_die->name == NULL)
14049 complaint (&symfile_complaints,
14050 _("malformed enumerator DIE ignored"));
14051 else if (building_psymtab)
14052 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14053 VAR_DOMAIN, LOC_CONST,
14054 (cu->language == language_cplus
14055 || cu->language == language_java)
14056 ? &objfile->global_psymbols
14057 : &objfile->static_psymbols,
14058 0, (CORE_ADDR) 0, cu->language, objfile);
14060 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14064 /* We'll save this DIE so link it in. */
14065 part_die->die_parent = parent_die;
14066 part_die->die_sibling = NULL;
14067 part_die->die_child = NULL;
14069 if (last_die && last_die == parent_die)
14070 last_die->die_child = part_die;
14072 last_die->die_sibling = part_die;
14074 last_die = part_die;
14076 if (first_die == NULL)
14077 first_die = part_die;
14079 /* Maybe add the DIE to the hash table. Not all DIEs that we
14080 find interesting need to be in the hash table, because we
14081 also have the parent/sibling/child chains; only those that we
14082 might refer to by offset later during partial symbol reading.
14084 For now this means things that might have be the target of a
14085 DW_AT_specification, DW_AT_abstract_origin, or
14086 DW_AT_extension. DW_AT_extension will refer only to
14087 namespaces; DW_AT_abstract_origin refers to functions (and
14088 many things under the function DIE, but we do not recurse
14089 into function DIEs during partial symbol reading) and
14090 possibly variables as well; DW_AT_specification refers to
14091 declarations. Declarations ought to have the DW_AT_declaration
14092 flag. It happens that GCC forgets to put it in sometimes, but
14093 only for functions, not for types.
14095 Adding more things than necessary to the hash table is harmless
14096 except for the performance cost. Adding too few will result in
14097 wasted time in find_partial_die, when we reread the compilation
14098 unit with load_all_dies set. */
14101 || abbrev->tag == DW_TAG_constant
14102 || abbrev->tag == DW_TAG_subprogram
14103 || abbrev->tag == DW_TAG_variable
14104 || abbrev->tag == DW_TAG_namespace
14105 || part_die->is_declaration)
14109 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
14110 part_die->offset.sect_off, INSERT);
14114 part_die = obstack_alloc (&cu->comp_unit_obstack,
14115 sizeof (struct partial_die_info));
14117 /* For some DIEs we want to follow their children (if any). For C
14118 we have no reason to follow the children of structures; for other
14119 languages we have to, so that we can get at method physnames
14120 to infer fully qualified class names, for DW_AT_specification,
14121 and for C++ template arguments. For C++, we also look one level
14122 inside functions to find template arguments (if the name of the
14123 function does not already contain the template arguments).
14125 For Ada, we need to scan the children of subprograms and lexical
14126 blocks as well because Ada allows the definition of nested
14127 entities that could be interesting for the debugger, such as
14128 nested subprograms for instance. */
14129 if (last_die->has_children
14131 || last_die->tag == DW_TAG_namespace
14132 || last_die->tag == DW_TAG_module
14133 || last_die->tag == DW_TAG_enumeration_type
14134 || (cu->language == language_cplus
14135 && last_die->tag == DW_TAG_subprogram
14136 && (last_die->name == NULL
14137 || strchr (last_die->name, '<') == NULL))
14138 || (cu->language != language_c
14139 && (last_die->tag == DW_TAG_class_type
14140 || last_die->tag == DW_TAG_interface_type
14141 || last_die->tag == DW_TAG_structure_type
14142 || last_die->tag == DW_TAG_union_type))
14143 || (cu->language == language_ada
14144 && (last_die->tag == DW_TAG_subprogram
14145 || last_die->tag == DW_TAG_lexical_block))))
14148 parent_die = last_die;
14152 /* Otherwise we skip to the next sibling, if any. */
14153 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
14155 /* Back to the top, do it again. */
14159 /* Read a minimal amount of information into the minimal die structure. */
14161 static const gdb_byte *
14162 read_partial_die (const struct die_reader_specs *reader,
14163 struct partial_die_info *part_die,
14164 struct abbrev_info *abbrev, unsigned int abbrev_len,
14165 const gdb_byte *info_ptr)
14167 struct dwarf2_cu *cu = reader->cu;
14168 struct objfile *objfile = cu->objfile;
14169 const gdb_byte *buffer = reader->buffer;
14171 struct attribute attr;
14172 int has_low_pc_attr = 0;
14173 int has_high_pc_attr = 0;
14174 int high_pc_relative = 0;
14176 memset (part_die, 0, sizeof (struct partial_die_info));
14178 part_die->offset.sect_off = info_ptr - buffer;
14180 info_ptr += abbrev_len;
14182 if (abbrev == NULL)
14185 part_die->tag = abbrev->tag;
14186 part_die->has_children = abbrev->has_children;
14188 for (i = 0; i < abbrev->num_attrs; ++i)
14190 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
14192 /* Store the data if it is of an attribute we want to keep in a
14193 partial symbol table. */
14197 switch (part_die->tag)
14199 case DW_TAG_compile_unit:
14200 case DW_TAG_partial_unit:
14201 case DW_TAG_type_unit:
14202 /* Compilation units have a DW_AT_name that is a filename, not
14203 a source language identifier. */
14204 case DW_TAG_enumeration_type:
14205 case DW_TAG_enumerator:
14206 /* These tags always have simple identifiers already; no need
14207 to canonicalize them. */
14208 part_die->name = DW_STRING (&attr);
14212 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
14213 &objfile->objfile_obstack);
14217 case DW_AT_linkage_name:
14218 case DW_AT_MIPS_linkage_name:
14219 /* Note that both forms of linkage name might appear. We
14220 assume they will be the same, and we only store the last
14222 if (cu->language == language_ada)
14223 part_die->name = DW_STRING (&attr);
14224 part_die->linkage_name = DW_STRING (&attr);
14227 has_low_pc_attr = 1;
14228 part_die->lowpc = DW_ADDR (&attr);
14230 case DW_AT_high_pc:
14231 has_high_pc_attr = 1;
14232 if (attr.form == DW_FORM_addr
14233 || attr.form == DW_FORM_GNU_addr_index)
14234 part_die->highpc = DW_ADDR (&attr);
14237 high_pc_relative = 1;
14238 part_die->highpc = DW_UNSND (&attr);
14241 case DW_AT_location:
14242 /* Support the .debug_loc offsets. */
14243 if (attr_form_is_block (&attr))
14245 part_die->d.locdesc = DW_BLOCK (&attr);
14247 else if (attr_form_is_section_offset (&attr))
14249 dwarf2_complex_location_expr_complaint ();
14253 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14254 "partial symbol information");
14257 case DW_AT_external:
14258 part_die->is_external = DW_UNSND (&attr);
14260 case DW_AT_declaration:
14261 part_die->is_declaration = DW_UNSND (&attr);
14264 part_die->has_type = 1;
14266 case DW_AT_abstract_origin:
14267 case DW_AT_specification:
14268 case DW_AT_extension:
14269 part_die->has_specification = 1;
14270 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
14271 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14272 || cu->per_cu->is_dwz);
14274 case DW_AT_sibling:
14275 /* Ignore absolute siblings, they might point outside of
14276 the current compile unit. */
14277 if (attr.form == DW_FORM_ref_addr)
14278 complaint (&symfile_complaints,
14279 _("ignoring absolute DW_AT_sibling"));
14281 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
14283 case DW_AT_byte_size:
14284 part_die->has_byte_size = 1;
14286 case DW_AT_calling_convention:
14287 /* DWARF doesn't provide a way to identify a program's source-level
14288 entry point. DW_AT_calling_convention attributes are only meant
14289 to describe functions' calling conventions.
14291 However, because it's a necessary piece of information in
14292 Fortran, and because DW_CC_program is the only piece of debugging
14293 information whose definition refers to a 'main program' at all,
14294 several compilers have begun marking Fortran main programs with
14295 DW_CC_program --- even when those functions use the standard
14296 calling conventions.
14298 So until DWARF specifies a way to provide this information and
14299 compilers pick up the new representation, we'll support this
14301 if (DW_UNSND (&attr) == DW_CC_program
14302 && cu->language == language_fortran)
14304 set_main_name (part_die->name);
14306 /* As this DIE has a static linkage the name would be difficult
14307 to look up later. */
14308 language_of_main = language_fortran;
14312 if (DW_UNSND (&attr) == DW_INL_inlined
14313 || DW_UNSND (&attr) == DW_INL_declared_inlined)
14314 part_die->may_be_inlined = 1;
14318 if (part_die->tag == DW_TAG_imported_unit)
14320 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
14321 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14322 || cu->per_cu->is_dwz);
14331 if (high_pc_relative)
14332 part_die->highpc += part_die->lowpc;
14334 if (has_low_pc_attr && has_high_pc_attr)
14336 /* When using the GNU linker, .gnu.linkonce. sections are used to
14337 eliminate duplicate copies of functions and vtables and such.
14338 The linker will arbitrarily choose one and discard the others.
14339 The AT_*_pc values for such functions refer to local labels in
14340 these sections. If the section from that file was discarded, the
14341 labels are not in the output, so the relocs get a value of 0.
14342 If this is a discarded function, mark the pc bounds as invalid,
14343 so that GDB will ignore it. */
14344 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
14346 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14348 complaint (&symfile_complaints,
14349 _("DW_AT_low_pc %s is zero "
14350 "for DIE at 0x%x [in module %s]"),
14351 paddress (gdbarch, part_die->lowpc),
14352 part_die->offset.sect_off, objfile->name);
14354 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
14355 else if (part_die->lowpc >= part_die->highpc)
14357 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14359 complaint (&symfile_complaints,
14360 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
14361 "for DIE at 0x%x [in module %s]"),
14362 paddress (gdbarch, part_die->lowpc),
14363 paddress (gdbarch, part_die->highpc),
14364 part_die->offset.sect_off, objfile->name);
14367 part_die->has_pc_info = 1;
14373 /* Find a cached partial DIE at OFFSET in CU. */
14375 static struct partial_die_info *
14376 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
14378 struct partial_die_info *lookup_die = NULL;
14379 struct partial_die_info part_die;
14381 part_die.offset = offset;
14382 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
14388 /* Find a partial DIE at OFFSET, which may or may not be in CU,
14389 except in the case of .debug_types DIEs which do not reference
14390 outside their CU (they do however referencing other types via
14391 DW_FORM_ref_sig8). */
14393 static struct partial_die_info *
14394 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
14396 struct objfile *objfile = cu->objfile;
14397 struct dwarf2_per_cu_data *per_cu = NULL;
14398 struct partial_die_info *pd = NULL;
14400 if (offset_in_dwz == cu->per_cu->is_dwz
14401 && offset_in_cu_p (&cu->header, offset))
14403 pd = find_partial_die_in_comp_unit (offset, cu);
14406 /* We missed recording what we needed.
14407 Load all dies and try again. */
14408 per_cu = cu->per_cu;
14412 /* TUs don't reference other CUs/TUs (except via type signatures). */
14413 if (cu->per_cu->is_debug_types)
14415 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14416 " external reference to offset 0x%lx [in module %s].\n"),
14417 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14418 bfd_get_filename (objfile->obfd));
14420 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14423 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14424 load_partial_comp_unit (per_cu);
14426 per_cu->cu->last_used = 0;
14427 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14430 /* If we didn't find it, and not all dies have been loaded,
14431 load them all and try again. */
14433 if (pd == NULL && per_cu->load_all_dies == 0)
14435 per_cu->load_all_dies = 1;
14437 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14438 THIS_CU->cu may already be in use. So we can't just free it and
14439 replace its DIEs with the ones we read in. Instead, we leave those
14440 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14441 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14443 load_partial_comp_unit (per_cu);
14445 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14449 internal_error (__FILE__, __LINE__,
14450 _("could not find partial DIE 0x%x "
14451 "in cache [from module %s]\n"),
14452 offset.sect_off, bfd_get_filename (objfile->obfd));
14456 /* See if we can figure out if the class lives in a namespace. We do
14457 this by looking for a member function; its demangled name will
14458 contain namespace info, if there is any. */
14461 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14462 struct dwarf2_cu *cu)
14464 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14465 what template types look like, because the demangler
14466 frequently doesn't give the same name as the debug info. We
14467 could fix this by only using the demangled name to get the
14468 prefix (but see comment in read_structure_type). */
14470 struct partial_die_info *real_pdi;
14471 struct partial_die_info *child_pdi;
14473 /* If this DIE (this DIE's specification, if any) has a parent, then
14474 we should not do this. We'll prepend the parent's fully qualified
14475 name when we create the partial symbol. */
14477 real_pdi = struct_pdi;
14478 while (real_pdi->has_specification)
14479 real_pdi = find_partial_die (real_pdi->spec_offset,
14480 real_pdi->spec_is_dwz, cu);
14482 if (real_pdi->die_parent != NULL)
14485 for (child_pdi = struct_pdi->die_child;
14487 child_pdi = child_pdi->die_sibling)
14489 if (child_pdi->tag == DW_TAG_subprogram
14490 && child_pdi->linkage_name != NULL)
14492 char *actual_class_name
14493 = language_class_name_from_physname (cu->language_defn,
14494 child_pdi->linkage_name);
14495 if (actual_class_name != NULL)
14498 = obstack_copy0 (&cu->objfile->objfile_obstack,
14500 strlen (actual_class_name));
14501 xfree (actual_class_name);
14508 /* Adjust PART_DIE before generating a symbol for it. This function
14509 may set the is_external flag or change the DIE's name. */
14512 fixup_partial_die (struct partial_die_info *part_die,
14513 struct dwarf2_cu *cu)
14515 /* Once we've fixed up a die, there's no point in doing so again.
14516 This also avoids a memory leak if we were to call
14517 guess_partial_die_structure_name multiple times. */
14518 if (part_die->fixup_called)
14521 /* If we found a reference attribute and the DIE has no name, try
14522 to find a name in the referred to DIE. */
14524 if (part_die->name == NULL && part_die->has_specification)
14526 struct partial_die_info *spec_die;
14528 spec_die = find_partial_die (part_die->spec_offset,
14529 part_die->spec_is_dwz, cu);
14531 fixup_partial_die (spec_die, cu);
14533 if (spec_die->name)
14535 part_die->name = spec_die->name;
14537 /* Copy DW_AT_external attribute if it is set. */
14538 if (spec_die->is_external)
14539 part_die->is_external = spec_die->is_external;
14543 /* Set default names for some unnamed DIEs. */
14545 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14546 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14548 /* If there is no parent die to provide a namespace, and there are
14549 children, see if we can determine the namespace from their linkage
14551 if (cu->language == language_cplus
14552 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14553 && part_die->die_parent == NULL
14554 && part_die->has_children
14555 && (part_die->tag == DW_TAG_class_type
14556 || part_die->tag == DW_TAG_structure_type
14557 || part_die->tag == DW_TAG_union_type))
14558 guess_partial_die_structure_name (part_die, cu);
14560 /* GCC might emit a nameless struct or union that has a linkage
14561 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14562 if (part_die->name == NULL
14563 && (part_die->tag == DW_TAG_class_type
14564 || part_die->tag == DW_TAG_interface_type
14565 || part_die->tag == DW_TAG_structure_type
14566 || part_die->tag == DW_TAG_union_type)
14567 && part_die->linkage_name != NULL)
14571 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14576 /* Strip any leading namespaces/classes, keep only the base name.
14577 DW_AT_name for named DIEs does not contain the prefixes. */
14578 base = strrchr (demangled, ':');
14579 if (base && base > demangled && base[-1] == ':')
14584 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14585 base, strlen (base));
14590 part_die->fixup_called = 1;
14593 /* Read an attribute value described by an attribute form. */
14595 static const gdb_byte *
14596 read_attribute_value (const struct die_reader_specs *reader,
14597 struct attribute *attr, unsigned form,
14598 const gdb_byte *info_ptr)
14600 struct dwarf2_cu *cu = reader->cu;
14601 bfd *abfd = reader->abfd;
14602 struct comp_unit_head *cu_header = &cu->header;
14603 unsigned int bytes_read;
14604 struct dwarf_block *blk;
14609 case DW_FORM_ref_addr:
14610 if (cu->header.version == 2)
14611 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14613 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14614 &cu->header, &bytes_read);
14615 info_ptr += bytes_read;
14617 case DW_FORM_GNU_ref_alt:
14618 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14619 info_ptr += bytes_read;
14622 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14623 info_ptr += bytes_read;
14625 case DW_FORM_block2:
14626 blk = dwarf_alloc_block (cu);
14627 blk->size = read_2_bytes (abfd, info_ptr);
14629 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14630 info_ptr += blk->size;
14631 DW_BLOCK (attr) = blk;
14633 case DW_FORM_block4:
14634 blk = dwarf_alloc_block (cu);
14635 blk->size = read_4_bytes (abfd, info_ptr);
14637 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14638 info_ptr += blk->size;
14639 DW_BLOCK (attr) = blk;
14641 case DW_FORM_data2:
14642 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14645 case DW_FORM_data4:
14646 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14649 case DW_FORM_data8:
14650 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14653 case DW_FORM_sec_offset:
14654 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14655 info_ptr += bytes_read;
14657 case DW_FORM_string:
14658 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14659 DW_STRING_IS_CANONICAL (attr) = 0;
14660 info_ptr += bytes_read;
14663 if (!cu->per_cu->is_dwz)
14665 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14667 DW_STRING_IS_CANONICAL (attr) = 0;
14668 info_ptr += bytes_read;
14672 case DW_FORM_GNU_strp_alt:
14674 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14675 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14678 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14679 DW_STRING_IS_CANONICAL (attr) = 0;
14680 info_ptr += bytes_read;
14683 case DW_FORM_exprloc:
14684 case DW_FORM_block:
14685 blk = dwarf_alloc_block (cu);
14686 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14687 info_ptr += bytes_read;
14688 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14689 info_ptr += blk->size;
14690 DW_BLOCK (attr) = blk;
14692 case DW_FORM_block1:
14693 blk = dwarf_alloc_block (cu);
14694 blk->size = read_1_byte (abfd, info_ptr);
14696 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14697 info_ptr += blk->size;
14698 DW_BLOCK (attr) = blk;
14700 case DW_FORM_data1:
14701 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14705 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14708 case DW_FORM_flag_present:
14709 DW_UNSND (attr) = 1;
14711 case DW_FORM_sdata:
14712 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14713 info_ptr += bytes_read;
14715 case DW_FORM_udata:
14716 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14717 info_ptr += bytes_read;
14720 DW_UNSND (attr) = (cu->header.offset.sect_off
14721 + read_1_byte (abfd, info_ptr));
14725 DW_UNSND (attr) = (cu->header.offset.sect_off
14726 + read_2_bytes (abfd, info_ptr));
14730 DW_UNSND (attr) = (cu->header.offset.sect_off
14731 + read_4_bytes (abfd, info_ptr));
14735 DW_UNSND (attr) = (cu->header.offset.sect_off
14736 + read_8_bytes (abfd, info_ptr));
14739 case DW_FORM_ref_sig8:
14740 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14743 case DW_FORM_ref_udata:
14744 DW_UNSND (attr) = (cu->header.offset.sect_off
14745 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14746 info_ptr += bytes_read;
14748 case DW_FORM_indirect:
14749 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14750 info_ptr += bytes_read;
14751 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14753 case DW_FORM_GNU_addr_index:
14754 if (reader->dwo_file == NULL)
14756 /* For now flag a hard error.
14757 Later we can turn this into a complaint. */
14758 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14759 dwarf_form_name (form),
14760 bfd_get_filename (abfd));
14762 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14763 info_ptr += bytes_read;
14765 case DW_FORM_GNU_str_index:
14766 if (reader->dwo_file == NULL)
14768 /* For now flag a hard error.
14769 Later we can turn this into a complaint if warranted. */
14770 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14771 dwarf_form_name (form),
14772 bfd_get_filename (abfd));
14775 ULONGEST str_index =
14776 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14778 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14779 DW_STRING_IS_CANONICAL (attr) = 0;
14780 info_ptr += bytes_read;
14784 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14785 dwarf_form_name (form),
14786 bfd_get_filename (abfd));
14790 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14791 attr->form = DW_FORM_GNU_ref_alt;
14793 /* We have seen instances where the compiler tried to emit a byte
14794 size attribute of -1 which ended up being encoded as an unsigned
14795 0xffffffff. Although 0xffffffff is technically a valid size value,
14796 an object of this size seems pretty unlikely so we can relatively
14797 safely treat these cases as if the size attribute was invalid and
14798 treat them as zero by default. */
14799 if (attr->name == DW_AT_byte_size
14800 && form == DW_FORM_data4
14801 && DW_UNSND (attr) >= 0xffffffff)
14804 (&symfile_complaints,
14805 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14806 hex_string (DW_UNSND (attr)));
14807 DW_UNSND (attr) = 0;
14813 /* Read an attribute described by an abbreviated attribute. */
14815 static const gdb_byte *
14816 read_attribute (const struct die_reader_specs *reader,
14817 struct attribute *attr, struct attr_abbrev *abbrev,
14818 const gdb_byte *info_ptr)
14820 attr->name = abbrev->name;
14821 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14824 /* Read dwarf information from a buffer. */
14826 static unsigned int
14827 read_1_byte (bfd *abfd, const gdb_byte *buf)
14829 return bfd_get_8 (abfd, buf);
14833 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14835 return bfd_get_signed_8 (abfd, buf);
14838 static unsigned int
14839 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14841 return bfd_get_16 (abfd, buf);
14845 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14847 return bfd_get_signed_16 (abfd, buf);
14850 static unsigned int
14851 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14853 return bfd_get_32 (abfd, buf);
14857 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14859 return bfd_get_signed_32 (abfd, buf);
14863 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14865 return bfd_get_64 (abfd, buf);
14869 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14870 unsigned int *bytes_read)
14872 struct comp_unit_head *cu_header = &cu->header;
14873 CORE_ADDR retval = 0;
14875 if (cu_header->signed_addr_p)
14877 switch (cu_header->addr_size)
14880 retval = bfd_get_signed_16 (abfd, buf);
14883 retval = bfd_get_signed_32 (abfd, buf);
14886 retval = bfd_get_signed_64 (abfd, buf);
14889 internal_error (__FILE__, __LINE__,
14890 _("read_address: bad switch, signed [in module %s]"),
14891 bfd_get_filename (abfd));
14896 switch (cu_header->addr_size)
14899 retval = bfd_get_16 (abfd, buf);
14902 retval = bfd_get_32 (abfd, buf);
14905 retval = bfd_get_64 (abfd, buf);
14908 internal_error (__FILE__, __LINE__,
14909 _("read_address: bad switch, "
14910 "unsigned [in module %s]"),
14911 bfd_get_filename (abfd));
14915 *bytes_read = cu_header->addr_size;
14919 /* Read the initial length from a section. The (draft) DWARF 3
14920 specification allows the initial length to take up either 4 bytes
14921 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14922 bytes describe the length and all offsets will be 8 bytes in length
14925 An older, non-standard 64-bit format is also handled by this
14926 function. The older format in question stores the initial length
14927 as an 8-byte quantity without an escape value. Lengths greater
14928 than 2^32 aren't very common which means that the initial 4 bytes
14929 is almost always zero. Since a length value of zero doesn't make
14930 sense for the 32-bit format, this initial zero can be considered to
14931 be an escape value which indicates the presence of the older 64-bit
14932 format. As written, the code can't detect (old format) lengths
14933 greater than 4GB. If it becomes necessary to handle lengths
14934 somewhat larger than 4GB, we could allow other small values (such
14935 as the non-sensical values of 1, 2, and 3) to also be used as
14936 escape values indicating the presence of the old format.
14938 The value returned via bytes_read should be used to increment the
14939 relevant pointer after calling read_initial_length().
14941 [ Note: read_initial_length() and read_offset() are based on the
14942 document entitled "DWARF Debugging Information Format", revision
14943 3, draft 8, dated November 19, 2001. This document was obtained
14946 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14948 This document is only a draft and is subject to change. (So beware.)
14950 Details regarding the older, non-standard 64-bit format were
14951 determined empirically by examining 64-bit ELF files produced by
14952 the SGI toolchain on an IRIX 6.5 machine.
14954 - Kevin, July 16, 2002
14958 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
14960 LONGEST length = bfd_get_32 (abfd, buf);
14962 if (length == 0xffffffff)
14964 length = bfd_get_64 (abfd, buf + 4);
14967 else if (length == 0)
14969 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
14970 length = bfd_get_64 (abfd, buf);
14981 /* Cover function for read_initial_length.
14982 Returns the length of the object at BUF, and stores the size of the
14983 initial length in *BYTES_READ and stores the size that offsets will be in
14985 If the initial length size is not equivalent to that specified in
14986 CU_HEADER then issue a complaint.
14987 This is useful when reading non-comp-unit headers. */
14990 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
14991 const struct comp_unit_head *cu_header,
14992 unsigned int *bytes_read,
14993 unsigned int *offset_size)
14995 LONGEST length = read_initial_length (abfd, buf, bytes_read);
14997 gdb_assert (cu_header->initial_length_size == 4
14998 || cu_header->initial_length_size == 8
14999 || cu_header->initial_length_size == 12);
15001 if (cu_header->initial_length_size != *bytes_read)
15002 complaint (&symfile_complaints,
15003 _("intermixed 32-bit and 64-bit DWARF sections"));
15005 *offset_size = (*bytes_read == 4) ? 4 : 8;
15009 /* Read an offset from the data stream. The size of the offset is
15010 given by cu_header->offset_size. */
15013 read_offset (bfd *abfd, const gdb_byte *buf,
15014 const struct comp_unit_head *cu_header,
15015 unsigned int *bytes_read)
15017 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
15019 *bytes_read = cu_header->offset_size;
15023 /* Read an offset from the data stream. */
15026 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
15028 LONGEST retval = 0;
15030 switch (offset_size)
15033 retval = bfd_get_32 (abfd, buf);
15036 retval = bfd_get_64 (abfd, buf);
15039 internal_error (__FILE__, __LINE__,
15040 _("read_offset_1: bad switch [in module %s]"),
15041 bfd_get_filename (abfd));
15047 static const gdb_byte *
15048 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
15050 /* If the size of a host char is 8 bits, we can return a pointer
15051 to the buffer, otherwise we have to copy the data to a buffer
15052 allocated on the temporary obstack. */
15053 gdb_assert (HOST_CHAR_BIT == 8);
15057 static const char *
15058 read_direct_string (bfd *abfd, const gdb_byte *buf,
15059 unsigned int *bytes_read_ptr)
15061 /* If the size of a host char is 8 bits, we can return a pointer
15062 to the string, otherwise we have to copy the string to a buffer
15063 allocated on the temporary obstack. */
15064 gdb_assert (HOST_CHAR_BIT == 8);
15067 *bytes_read_ptr = 1;
15070 *bytes_read_ptr = strlen ((const char *) buf) + 1;
15071 return (const char *) buf;
15074 static const char *
15075 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
15077 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
15078 if (dwarf2_per_objfile->str.buffer == NULL)
15079 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
15080 bfd_get_filename (abfd));
15081 if (str_offset >= dwarf2_per_objfile->str.size)
15082 error (_("DW_FORM_strp pointing outside of "
15083 ".debug_str section [in module %s]"),
15084 bfd_get_filename (abfd));
15085 gdb_assert (HOST_CHAR_BIT == 8);
15086 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
15088 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
15091 /* Read a string at offset STR_OFFSET in the .debug_str section from
15092 the .dwz file DWZ. Throw an error if the offset is too large. If
15093 the string consists of a single NUL byte, return NULL; otherwise
15094 return a pointer to the string. */
15096 static const char *
15097 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
15099 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
15101 if (dwz->str.buffer == NULL)
15102 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
15103 "section [in module %s]"),
15104 bfd_get_filename (dwz->dwz_bfd));
15105 if (str_offset >= dwz->str.size)
15106 error (_("DW_FORM_GNU_strp_alt pointing outside of "
15107 ".debug_str section [in module %s]"),
15108 bfd_get_filename (dwz->dwz_bfd));
15109 gdb_assert (HOST_CHAR_BIT == 8);
15110 if (dwz->str.buffer[str_offset] == '\0')
15112 return (const char *) (dwz->str.buffer + str_offset);
15115 static const char *
15116 read_indirect_string (bfd *abfd, const gdb_byte *buf,
15117 const struct comp_unit_head *cu_header,
15118 unsigned int *bytes_read_ptr)
15120 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
15122 return read_indirect_string_at_offset (abfd, str_offset);
15126 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
15127 unsigned int *bytes_read_ptr)
15130 unsigned int num_read;
15132 unsigned char byte;
15140 byte = bfd_get_8 (abfd, buf);
15143 result |= ((ULONGEST) (byte & 127) << shift);
15144 if ((byte & 128) == 0)
15150 *bytes_read_ptr = num_read;
15155 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
15156 unsigned int *bytes_read_ptr)
15159 int i, shift, num_read;
15160 unsigned char byte;
15168 byte = bfd_get_8 (abfd, buf);
15171 result |= ((LONGEST) (byte & 127) << shift);
15173 if ((byte & 128) == 0)
15178 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
15179 result |= -(((LONGEST) 1) << shift);
15180 *bytes_read_ptr = num_read;
15184 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
15185 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
15186 ADDR_SIZE is the size of addresses from the CU header. */
15189 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
15191 struct objfile *objfile = dwarf2_per_objfile->objfile;
15192 bfd *abfd = objfile->obfd;
15193 const gdb_byte *info_ptr;
15195 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
15196 if (dwarf2_per_objfile->addr.buffer == NULL)
15197 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
15199 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
15200 error (_("DW_FORM_addr_index pointing outside of "
15201 ".debug_addr section [in module %s]"),
15203 info_ptr = (dwarf2_per_objfile->addr.buffer
15204 + addr_base + addr_index * addr_size);
15205 if (addr_size == 4)
15206 return bfd_get_32 (abfd, info_ptr);
15208 return bfd_get_64 (abfd, info_ptr);
15211 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
15214 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
15216 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
15219 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
15222 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
15223 unsigned int *bytes_read)
15225 bfd *abfd = cu->objfile->obfd;
15226 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
15228 return read_addr_index (cu, addr_index);
15231 /* Data structure to pass results from dwarf2_read_addr_index_reader
15232 back to dwarf2_read_addr_index. */
15234 struct dwarf2_read_addr_index_data
15236 ULONGEST addr_base;
15240 /* die_reader_func for dwarf2_read_addr_index. */
15243 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
15244 const gdb_byte *info_ptr,
15245 struct die_info *comp_unit_die,
15249 struct dwarf2_cu *cu = reader->cu;
15250 struct dwarf2_read_addr_index_data *aidata =
15251 (struct dwarf2_read_addr_index_data *) data;
15253 aidata->addr_base = cu->addr_base;
15254 aidata->addr_size = cu->header.addr_size;
15257 /* Given an index in .debug_addr, fetch the value.
15258 NOTE: This can be called during dwarf expression evaluation,
15259 long after the debug information has been read, and thus per_cu->cu
15260 may no longer exist. */
15263 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
15264 unsigned int addr_index)
15266 struct objfile *objfile = per_cu->objfile;
15267 struct dwarf2_cu *cu = per_cu->cu;
15268 ULONGEST addr_base;
15271 /* This is intended to be called from outside this file. */
15272 dw2_setup (objfile);
15274 /* We need addr_base and addr_size.
15275 If we don't have PER_CU->cu, we have to get it.
15276 Nasty, but the alternative is storing the needed info in PER_CU,
15277 which at this point doesn't seem justified: it's not clear how frequently
15278 it would get used and it would increase the size of every PER_CU.
15279 Entry points like dwarf2_per_cu_addr_size do a similar thing
15280 so we're not in uncharted territory here.
15281 Alas we need to be a bit more complicated as addr_base is contained
15284 We don't need to read the entire CU(/TU).
15285 We just need the header and top level die.
15287 IWBN to use the aging mechanism to let us lazily later discard the CU.
15288 For now we skip this optimization. */
15292 addr_base = cu->addr_base;
15293 addr_size = cu->header.addr_size;
15297 struct dwarf2_read_addr_index_data aidata;
15299 /* Note: We can't use init_cutu_and_read_dies_simple here,
15300 we need addr_base. */
15301 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
15302 dwarf2_read_addr_index_reader, &aidata);
15303 addr_base = aidata.addr_base;
15304 addr_size = aidata.addr_size;
15307 return read_addr_index_1 (addr_index, addr_base, addr_size);
15310 /* Given a DW_AT_str_index, fetch the string. */
15312 static const char *
15313 read_str_index (const struct die_reader_specs *reader,
15314 struct dwarf2_cu *cu, ULONGEST str_index)
15316 struct objfile *objfile = dwarf2_per_objfile->objfile;
15317 const char *dwo_name = objfile->name;
15318 bfd *abfd = objfile->obfd;
15319 struct dwo_sections *sections = &reader->dwo_file->sections;
15320 const gdb_byte *info_ptr;
15321 ULONGEST str_offset;
15323 dwarf2_read_section (objfile, §ions->str);
15324 dwarf2_read_section (objfile, §ions->str_offsets);
15325 if (sections->str.buffer == NULL)
15326 error (_("DW_FORM_str_index used without .debug_str.dwo section"
15327 " in CU at offset 0x%lx [in module %s]"),
15328 (long) cu->header.offset.sect_off, dwo_name);
15329 if (sections->str_offsets.buffer == NULL)
15330 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
15331 " in CU at offset 0x%lx [in module %s]"),
15332 (long) cu->header.offset.sect_off, dwo_name);
15333 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
15334 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
15335 " section in CU at offset 0x%lx [in module %s]"),
15336 (long) cu->header.offset.sect_off, dwo_name);
15337 info_ptr = (sections->str_offsets.buffer
15338 + str_index * cu->header.offset_size);
15339 if (cu->header.offset_size == 4)
15340 str_offset = bfd_get_32 (abfd, info_ptr);
15342 str_offset = bfd_get_64 (abfd, info_ptr);
15343 if (str_offset >= sections->str.size)
15344 error (_("Offset from DW_FORM_str_index pointing outside of"
15345 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
15346 (long) cu->header.offset.sect_off, dwo_name);
15347 return (const char *) (sections->str.buffer + str_offset);
15350 /* Return the length of an LEB128 number in BUF. */
15353 leb128_size (const gdb_byte *buf)
15355 const gdb_byte *begin = buf;
15361 if ((byte & 128) == 0)
15362 return buf - begin;
15367 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
15375 cu->language = language_c;
15377 case DW_LANG_C_plus_plus:
15378 cu->language = language_cplus;
15381 cu->language = language_d;
15383 case DW_LANG_Fortran77:
15384 case DW_LANG_Fortran90:
15385 case DW_LANG_Fortran95:
15386 cu->language = language_fortran;
15389 cu->language = language_go;
15391 case DW_LANG_Mips_Assembler:
15392 cu->language = language_asm;
15395 cu->language = language_java;
15397 case DW_LANG_Ada83:
15398 case DW_LANG_Ada95:
15399 cu->language = language_ada;
15401 case DW_LANG_Modula2:
15402 cu->language = language_m2;
15404 case DW_LANG_Pascal83:
15405 cu->language = language_pascal;
15408 cu->language = language_objc;
15410 case DW_LANG_Cobol74:
15411 case DW_LANG_Cobol85:
15413 cu->language = language_minimal;
15416 cu->language_defn = language_def (cu->language);
15419 /* Return the named attribute or NULL if not there. */
15421 static struct attribute *
15422 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15427 struct attribute *spec = NULL;
15429 for (i = 0; i < die->num_attrs; ++i)
15431 if (die->attrs[i].name == name)
15432 return &die->attrs[i];
15433 if (die->attrs[i].name == DW_AT_specification
15434 || die->attrs[i].name == DW_AT_abstract_origin)
15435 spec = &die->attrs[i];
15441 die = follow_die_ref (die, spec, &cu);
15447 /* Return the named attribute or NULL if not there,
15448 but do not follow DW_AT_specification, etc.
15449 This is for use in contexts where we're reading .debug_types dies.
15450 Following DW_AT_specification, DW_AT_abstract_origin will take us
15451 back up the chain, and we want to go down. */
15453 static struct attribute *
15454 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15458 for (i = 0; i < die->num_attrs; ++i)
15459 if (die->attrs[i].name == name)
15460 return &die->attrs[i];
15465 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15466 and holds a non-zero value. This function should only be used for
15467 DW_FORM_flag or DW_FORM_flag_present attributes. */
15470 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15472 struct attribute *attr = dwarf2_attr (die, name, cu);
15474 return (attr && DW_UNSND (attr));
15478 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15480 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15481 which value is non-zero. However, we have to be careful with
15482 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15483 (via dwarf2_flag_true_p) follows this attribute. So we may
15484 end up accidently finding a declaration attribute that belongs
15485 to a different DIE referenced by the specification attribute,
15486 even though the given DIE does not have a declaration attribute. */
15487 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15488 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15491 /* Return the die giving the specification for DIE, if there is
15492 one. *SPEC_CU is the CU containing DIE on input, and the CU
15493 containing the return value on output. If there is no
15494 specification, but there is an abstract origin, that is
15497 static struct die_info *
15498 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15500 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15503 if (spec_attr == NULL)
15504 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15506 if (spec_attr == NULL)
15509 return follow_die_ref (die, spec_attr, spec_cu);
15512 /* Free the line_header structure *LH, and any arrays and strings it
15514 NOTE: This is also used as a "cleanup" function. */
15517 free_line_header (struct line_header *lh)
15519 if (lh->standard_opcode_lengths)
15520 xfree (lh->standard_opcode_lengths);
15522 /* Remember that all the lh->file_names[i].name pointers are
15523 pointers into debug_line_buffer, and don't need to be freed. */
15524 if (lh->file_names)
15525 xfree (lh->file_names);
15527 /* Similarly for the include directory names. */
15528 if (lh->include_dirs)
15529 xfree (lh->include_dirs);
15534 /* Add an entry to LH's include directory table. */
15537 add_include_dir (struct line_header *lh, const char *include_dir)
15539 /* Grow the array if necessary. */
15540 if (lh->include_dirs_size == 0)
15542 lh->include_dirs_size = 1; /* for testing */
15543 lh->include_dirs = xmalloc (lh->include_dirs_size
15544 * sizeof (*lh->include_dirs));
15546 else if (lh->num_include_dirs >= lh->include_dirs_size)
15548 lh->include_dirs_size *= 2;
15549 lh->include_dirs = xrealloc (lh->include_dirs,
15550 (lh->include_dirs_size
15551 * sizeof (*lh->include_dirs)));
15554 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15557 /* Add an entry to LH's file name table. */
15560 add_file_name (struct line_header *lh,
15562 unsigned int dir_index,
15563 unsigned int mod_time,
15564 unsigned int length)
15566 struct file_entry *fe;
15568 /* Grow the array if necessary. */
15569 if (lh->file_names_size == 0)
15571 lh->file_names_size = 1; /* for testing */
15572 lh->file_names = xmalloc (lh->file_names_size
15573 * sizeof (*lh->file_names));
15575 else if (lh->num_file_names >= lh->file_names_size)
15577 lh->file_names_size *= 2;
15578 lh->file_names = xrealloc (lh->file_names,
15579 (lh->file_names_size
15580 * sizeof (*lh->file_names)));
15583 fe = &lh->file_names[lh->num_file_names++];
15585 fe->dir_index = dir_index;
15586 fe->mod_time = mod_time;
15587 fe->length = length;
15588 fe->included_p = 0;
15592 /* A convenience function to find the proper .debug_line section for a
15595 static struct dwarf2_section_info *
15596 get_debug_line_section (struct dwarf2_cu *cu)
15598 struct dwarf2_section_info *section;
15600 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15602 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15603 section = &cu->dwo_unit->dwo_file->sections.line;
15604 else if (cu->per_cu->is_dwz)
15606 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15608 section = &dwz->line;
15611 section = &dwarf2_per_objfile->line;
15616 /* Read the statement program header starting at OFFSET in
15617 .debug_line, or .debug_line.dwo. Return a pointer
15618 to a struct line_header, allocated using xmalloc.
15620 NOTE: the strings in the include directory and file name tables of
15621 the returned object point into the dwarf line section buffer,
15622 and must not be freed. */
15624 static struct line_header *
15625 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15627 struct cleanup *back_to;
15628 struct line_header *lh;
15629 const gdb_byte *line_ptr;
15630 unsigned int bytes_read, offset_size;
15632 const char *cur_dir, *cur_file;
15633 struct dwarf2_section_info *section;
15636 section = get_debug_line_section (cu);
15637 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15638 if (section->buffer == NULL)
15640 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15641 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15643 complaint (&symfile_complaints, _("missing .debug_line section"));
15647 /* We can't do this until we know the section is non-empty.
15648 Only then do we know we have such a section. */
15649 abfd = section->asection->owner;
15651 /* Make sure that at least there's room for the total_length field.
15652 That could be 12 bytes long, but we're just going to fudge that. */
15653 if (offset + 4 >= section->size)
15655 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15659 lh = xmalloc (sizeof (*lh));
15660 memset (lh, 0, sizeof (*lh));
15661 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15664 line_ptr = section->buffer + offset;
15666 /* Read in the header. */
15668 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15669 &bytes_read, &offset_size);
15670 line_ptr += bytes_read;
15671 if (line_ptr + lh->total_length > (section->buffer + section->size))
15673 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15676 lh->statement_program_end = line_ptr + lh->total_length;
15677 lh->version = read_2_bytes (abfd, line_ptr);
15679 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15680 line_ptr += offset_size;
15681 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15683 if (lh->version >= 4)
15685 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15689 lh->maximum_ops_per_instruction = 1;
15691 if (lh->maximum_ops_per_instruction == 0)
15693 lh->maximum_ops_per_instruction = 1;
15694 complaint (&symfile_complaints,
15695 _("invalid maximum_ops_per_instruction "
15696 "in `.debug_line' section"));
15699 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15701 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15703 lh->line_range = read_1_byte (abfd, line_ptr);
15705 lh->opcode_base = read_1_byte (abfd, line_ptr);
15707 lh->standard_opcode_lengths
15708 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15710 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15711 for (i = 1; i < lh->opcode_base; ++i)
15713 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15717 /* Read directory table. */
15718 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15720 line_ptr += bytes_read;
15721 add_include_dir (lh, cur_dir);
15723 line_ptr += bytes_read;
15725 /* Read file name table. */
15726 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15728 unsigned int dir_index, mod_time, length;
15730 line_ptr += bytes_read;
15731 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15732 line_ptr += bytes_read;
15733 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15734 line_ptr += bytes_read;
15735 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15736 line_ptr += bytes_read;
15738 add_file_name (lh, cur_file, dir_index, mod_time, length);
15740 line_ptr += bytes_read;
15741 lh->statement_program_start = line_ptr;
15743 if (line_ptr > (section->buffer + section->size))
15744 complaint (&symfile_complaints,
15745 _("line number info header doesn't "
15746 "fit in `.debug_line' section"));
15748 discard_cleanups (back_to);
15752 /* Subroutine of dwarf_decode_lines to simplify it.
15753 Return the file name of the psymtab for included file FILE_INDEX
15754 in line header LH of PST.
15755 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15756 If space for the result is malloc'd, it will be freed by a cleanup.
15757 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15759 The function creates dangling cleanup registration. */
15761 static const char *
15762 psymtab_include_file_name (const struct line_header *lh, int file_index,
15763 const struct partial_symtab *pst,
15764 const char *comp_dir)
15766 const struct file_entry fe = lh->file_names [file_index];
15767 const char *include_name = fe.name;
15768 const char *include_name_to_compare = include_name;
15769 const char *dir_name = NULL;
15770 const char *pst_filename;
15771 char *copied_name = NULL;
15775 dir_name = lh->include_dirs[fe.dir_index - 1];
15777 if (!IS_ABSOLUTE_PATH (include_name)
15778 && (dir_name != NULL || comp_dir != NULL))
15780 /* Avoid creating a duplicate psymtab for PST.
15781 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15782 Before we do the comparison, however, we need to account
15783 for DIR_NAME and COMP_DIR.
15784 First prepend dir_name (if non-NULL). If we still don't
15785 have an absolute path prepend comp_dir (if non-NULL).
15786 However, the directory we record in the include-file's
15787 psymtab does not contain COMP_DIR (to match the
15788 corresponding symtab(s)).
15793 bash$ gcc -g ./hello.c
15794 include_name = "hello.c"
15796 DW_AT_comp_dir = comp_dir = "/tmp"
15797 DW_AT_name = "./hello.c" */
15799 if (dir_name != NULL)
15801 char *tem = concat (dir_name, SLASH_STRING,
15802 include_name, (char *)NULL);
15804 make_cleanup (xfree, tem);
15805 include_name = tem;
15806 include_name_to_compare = include_name;
15808 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15810 char *tem = concat (comp_dir, SLASH_STRING,
15811 include_name, (char *)NULL);
15813 make_cleanup (xfree, tem);
15814 include_name_to_compare = tem;
15818 pst_filename = pst->filename;
15819 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15821 copied_name = concat (pst->dirname, SLASH_STRING,
15822 pst_filename, (char *)NULL);
15823 pst_filename = copied_name;
15826 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15828 if (copied_name != NULL)
15829 xfree (copied_name);
15833 return include_name;
15836 /* Ignore this record_line request. */
15839 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15844 /* Subroutine of dwarf_decode_lines to simplify it.
15845 Process the line number information in LH. */
15848 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15849 struct dwarf2_cu *cu, struct partial_symtab *pst)
15851 const gdb_byte *line_ptr, *extended_end;
15852 const gdb_byte *line_end;
15853 unsigned int bytes_read, extended_len;
15854 unsigned char op_code, extended_op, adj_opcode;
15855 CORE_ADDR baseaddr;
15856 struct objfile *objfile = cu->objfile;
15857 bfd *abfd = objfile->obfd;
15858 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15859 const int decode_for_pst_p = (pst != NULL);
15860 struct subfile *last_subfile = NULL;
15861 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15864 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15866 line_ptr = lh->statement_program_start;
15867 line_end = lh->statement_program_end;
15869 /* Read the statement sequences until there's nothing left. */
15870 while (line_ptr < line_end)
15872 /* state machine registers */
15873 CORE_ADDR address = 0;
15874 unsigned int file = 1;
15875 unsigned int line = 1;
15876 unsigned int column = 0;
15877 int is_stmt = lh->default_is_stmt;
15878 int basic_block = 0;
15879 int end_sequence = 0;
15881 unsigned char op_index = 0;
15883 if (!decode_for_pst_p && lh->num_file_names >= file)
15885 /* Start a subfile for the current file of the state machine. */
15886 /* lh->include_dirs and lh->file_names are 0-based, but the
15887 directory and file name numbers in the statement program
15889 struct file_entry *fe = &lh->file_names[file - 1];
15890 const char *dir = NULL;
15893 dir = lh->include_dirs[fe->dir_index - 1];
15895 dwarf2_start_subfile (fe->name, dir, comp_dir);
15898 /* Decode the table. */
15899 while (!end_sequence)
15901 op_code = read_1_byte (abfd, line_ptr);
15903 if (line_ptr > line_end)
15905 dwarf2_debug_line_missing_end_sequence_complaint ();
15909 if (op_code >= lh->opcode_base)
15911 /* Special operand. */
15912 adj_opcode = op_code - lh->opcode_base;
15913 address += (((op_index + (adj_opcode / lh->line_range))
15914 / lh->maximum_ops_per_instruction)
15915 * lh->minimum_instruction_length);
15916 op_index = ((op_index + (adj_opcode / lh->line_range))
15917 % lh->maximum_ops_per_instruction);
15918 line += lh->line_base + (adj_opcode % lh->line_range);
15919 if (lh->num_file_names < file || file == 0)
15920 dwarf2_debug_line_missing_file_complaint ();
15921 /* For now we ignore lines not starting on an
15922 instruction boundary. */
15923 else if (op_index == 0)
15925 lh->file_names[file - 1].included_p = 1;
15926 if (!decode_for_pst_p && is_stmt)
15928 if (last_subfile != current_subfile)
15930 addr = gdbarch_addr_bits_remove (gdbarch, address);
15932 (*p_record_line) (last_subfile, 0, addr);
15933 last_subfile = current_subfile;
15935 /* Append row to matrix using current values. */
15936 addr = gdbarch_addr_bits_remove (gdbarch, address);
15937 (*p_record_line) (current_subfile, line, addr);
15942 else switch (op_code)
15944 case DW_LNS_extended_op:
15945 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15947 line_ptr += bytes_read;
15948 extended_end = line_ptr + extended_len;
15949 extended_op = read_1_byte (abfd, line_ptr);
15951 switch (extended_op)
15953 case DW_LNE_end_sequence:
15954 p_record_line = record_line;
15957 case DW_LNE_set_address:
15958 address = read_address (abfd, line_ptr, cu, &bytes_read);
15960 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15962 /* This line table is for a function which has been
15963 GCd by the linker. Ignore it. PR gdb/12528 */
15966 = line_ptr - get_debug_line_section (cu)->buffer;
15968 complaint (&symfile_complaints,
15969 _(".debug_line address at offset 0x%lx is 0 "
15971 line_offset, objfile->name);
15972 p_record_line = noop_record_line;
15976 line_ptr += bytes_read;
15977 address += baseaddr;
15979 case DW_LNE_define_file:
15981 const char *cur_file;
15982 unsigned int dir_index, mod_time, length;
15984 cur_file = read_direct_string (abfd, line_ptr,
15986 line_ptr += bytes_read;
15988 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15989 line_ptr += bytes_read;
15991 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15992 line_ptr += bytes_read;
15994 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15995 line_ptr += bytes_read;
15996 add_file_name (lh, cur_file, dir_index, mod_time, length);
15999 case DW_LNE_set_discriminator:
16000 /* The discriminator is not interesting to the debugger;
16002 line_ptr = extended_end;
16005 complaint (&symfile_complaints,
16006 _("mangled .debug_line section"));
16009 /* Make sure that we parsed the extended op correctly. If e.g.
16010 we expected a different address size than the producer used,
16011 we may have read the wrong number of bytes. */
16012 if (line_ptr != extended_end)
16014 complaint (&symfile_complaints,
16015 _("mangled .debug_line section"));
16020 if (lh->num_file_names < file || file == 0)
16021 dwarf2_debug_line_missing_file_complaint ();
16024 lh->file_names[file - 1].included_p = 1;
16025 if (!decode_for_pst_p && is_stmt)
16027 if (last_subfile != current_subfile)
16029 addr = gdbarch_addr_bits_remove (gdbarch, address);
16031 (*p_record_line) (last_subfile, 0, addr);
16032 last_subfile = current_subfile;
16034 addr = gdbarch_addr_bits_remove (gdbarch, address);
16035 (*p_record_line) (current_subfile, line, addr);
16040 case DW_LNS_advance_pc:
16043 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16045 address += (((op_index + adjust)
16046 / lh->maximum_ops_per_instruction)
16047 * lh->minimum_instruction_length);
16048 op_index = ((op_index + adjust)
16049 % lh->maximum_ops_per_instruction);
16050 line_ptr += bytes_read;
16053 case DW_LNS_advance_line:
16054 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
16055 line_ptr += bytes_read;
16057 case DW_LNS_set_file:
16059 /* The arrays lh->include_dirs and lh->file_names are
16060 0-based, but the directory and file name numbers in
16061 the statement program are 1-based. */
16062 struct file_entry *fe;
16063 const char *dir = NULL;
16065 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16066 line_ptr += bytes_read;
16067 if (lh->num_file_names < file || file == 0)
16068 dwarf2_debug_line_missing_file_complaint ();
16071 fe = &lh->file_names[file - 1];
16073 dir = lh->include_dirs[fe->dir_index - 1];
16074 if (!decode_for_pst_p)
16076 last_subfile = current_subfile;
16077 dwarf2_start_subfile (fe->name, dir, comp_dir);
16082 case DW_LNS_set_column:
16083 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16084 line_ptr += bytes_read;
16086 case DW_LNS_negate_stmt:
16087 is_stmt = (!is_stmt);
16089 case DW_LNS_set_basic_block:
16092 /* Add to the address register of the state machine the
16093 address increment value corresponding to special opcode
16094 255. I.e., this value is scaled by the minimum
16095 instruction length since special opcode 255 would have
16096 scaled the increment. */
16097 case DW_LNS_const_add_pc:
16099 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
16101 address += (((op_index + adjust)
16102 / lh->maximum_ops_per_instruction)
16103 * lh->minimum_instruction_length);
16104 op_index = ((op_index + adjust)
16105 % lh->maximum_ops_per_instruction);
16108 case DW_LNS_fixed_advance_pc:
16109 address += read_2_bytes (abfd, line_ptr);
16115 /* Unknown standard opcode, ignore it. */
16118 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
16120 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16121 line_ptr += bytes_read;
16126 if (lh->num_file_names < file || file == 0)
16127 dwarf2_debug_line_missing_file_complaint ();
16130 lh->file_names[file - 1].included_p = 1;
16131 if (!decode_for_pst_p)
16133 addr = gdbarch_addr_bits_remove (gdbarch, address);
16134 (*p_record_line) (current_subfile, 0, addr);
16140 /* Decode the Line Number Program (LNP) for the given line_header
16141 structure and CU. The actual information extracted and the type
16142 of structures created from the LNP depends on the value of PST.
16144 1. If PST is NULL, then this procedure uses the data from the program
16145 to create all necessary symbol tables, and their linetables.
16147 2. If PST is not NULL, this procedure reads the program to determine
16148 the list of files included by the unit represented by PST, and
16149 builds all the associated partial symbol tables.
16151 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16152 It is used for relative paths in the line table.
16153 NOTE: When processing partial symtabs (pst != NULL),
16154 comp_dir == pst->dirname.
16156 NOTE: It is important that psymtabs have the same file name (via strcmp)
16157 as the corresponding symtab. Since COMP_DIR is not used in the name of the
16158 symtab we don't use it in the name of the psymtabs we create.
16159 E.g. expand_line_sal requires this when finding psymtabs to expand.
16160 A good testcase for this is mb-inline.exp. */
16163 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
16164 struct dwarf2_cu *cu, struct partial_symtab *pst,
16165 int want_line_info)
16167 struct objfile *objfile = cu->objfile;
16168 const int decode_for_pst_p = (pst != NULL);
16169 struct subfile *first_subfile = current_subfile;
16171 if (want_line_info)
16172 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
16174 if (decode_for_pst_p)
16178 /* Now that we're done scanning the Line Header Program, we can
16179 create the psymtab of each included file. */
16180 for (file_index = 0; file_index < lh->num_file_names; file_index++)
16181 if (lh->file_names[file_index].included_p == 1)
16183 const char *include_name =
16184 psymtab_include_file_name (lh, file_index, pst, comp_dir);
16185 if (include_name != NULL)
16186 dwarf2_create_include_psymtab (include_name, pst, objfile);
16191 /* Make sure a symtab is created for every file, even files
16192 which contain only variables (i.e. no code with associated
16196 for (i = 0; i < lh->num_file_names; i++)
16198 const char *dir = NULL;
16199 struct file_entry *fe;
16201 fe = &lh->file_names[i];
16203 dir = lh->include_dirs[fe->dir_index - 1];
16204 dwarf2_start_subfile (fe->name, dir, comp_dir);
16206 /* Skip the main file; we don't need it, and it must be
16207 allocated last, so that it will show up before the
16208 non-primary symtabs in the objfile's symtab list. */
16209 if (current_subfile == first_subfile)
16212 if (current_subfile->symtab == NULL)
16213 current_subfile->symtab = allocate_symtab (current_subfile->name,
16215 fe->symtab = current_subfile->symtab;
16220 /* Start a subfile for DWARF. FILENAME is the name of the file and
16221 DIRNAME the name of the source directory which contains FILENAME
16222 or NULL if not known. COMP_DIR is the compilation directory for the
16223 linetable's compilation unit or NULL if not known.
16224 This routine tries to keep line numbers from identical absolute and
16225 relative file names in a common subfile.
16227 Using the `list' example from the GDB testsuite, which resides in
16228 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
16229 of /srcdir/list0.c yields the following debugging information for list0.c:
16231 DW_AT_name: /srcdir/list0.c
16232 DW_AT_comp_dir: /compdir
16233 files.files[0].name: list0.h
16234 files.files[0].dir: /srcdir
16235 files.files[1].name: list0.c
16236 files.files[1].dir: /srcdir
16238 The line number information for list0.c has to end up in a single
16239 subfile, so that `break /srcdir/list0.c:1' works as expected.
16240 start_subfile will ensure that this happens provided that we pass the
16241 concatenation of files.files[1].dir and files.files[1].name as the
16245 dwarf2_start_subfile (const char *filename, const char *dirname,
16246 const char *comp_dir)
16250 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
16251 `start_symtab' will always pass the contents of DW_AT_comp_dir as
16252 second argument to start_subfile. To be consistent, we do the
16253 same here. In order not to lose the line information directory,
16254 we concatenate it to the filename when it makes sense.
16255 Note that the Dwarf3 standard says (speaking of filenames in line
16256 information): ``The directory index is ignored for file names
16257 that represent full path names''. Thus ignoring dirname in the
16258 `else' branch below isn't an issue. */
16260 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
16262 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
16266 start_subfile (filename, comp_dir);
16272 /* Start a symtab for DWARF.
16273 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
16276 dwarf2_start_symtab (struct dwarf2_cu *cu,
16277 const char *name, const char *comp_dir, CORE_ADDR low_pc)
16279 start_symtab (name, comp_dir, low_pc);
16280 record_debugformat ("DWARF 2");
16281 record_producer (cu->producer);
16283 /* We assume that we're processing GCC output. */
16284 processing_gcc_compilation = 2;
16286 cu->processing_has_namespace_info = 0;
16290 var_decode_location (struct attribute *attr, struct symbol *sym,
16291 struct dwarf2_cu *cu)
16293 struct objfile *objfile = cu->objfile;
16294 struct comp_unit_head *cu_header = &cu->header;
16296 /* NOTE drow/2003-01-30: There used to be a comment and some special
16297 code here to turn a symbol with DW_AT_external and a
16298 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
16299 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
16300 with some versions of binutils) where shared libraries could have
16301 relocations against symbols in their debug information - the
16302 minimal symbol would have the right address, but the debug info
16303 would not. It's no longer necessary, because we will explicitly
16304 apply relocations when we read in the debug information now. */
16306 /* A DW_AT_location attribute with no contents indicates that a
16307 variable has been optimized away. */
16308 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
16310 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16314 /* Handle one degenerate form of location expression specially, to
16315 preserve GDB's previous behavior when section offsets are
16316 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
16317 then mark this symbol as LOC_STATIC. */
16319 if (attr_form_is_block (attr)
16320 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
16321 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
16322 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
16323 && (DW_BLOCK (attr)->size
16324 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
16326 unsigned int dummy;
16328 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
16329 SYMBOL_VALUE_ADDRESS (sym) =
16330 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
16332 SYMBOL_VALUE_ADDRESS (sym) =
16333 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
16334 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
16335 fixup_symbol_section (sym, objfile);
16336 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
16337 SYMBOL_SECTION (sym));
16341 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
16342 expression evaluator, and use LOC_COMPUTED only when necessary
16343 (i.e. when the value of a register or memory location is
16344 referenced, or a thread-local block, etc.). Then again, it might
16345 not be worthwhile. I'm assuming that it isn't unless performance
16346 or memory numbers show me otherwise. */
16348 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
16350 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
16351 cu->has_loclist = 1;
16354 /* Given a pointer to a DWARF information entry, figure out if we need
16355 to make a symbol table entry for it, and if so, create a new entry
16356 and return a pointer to it.
16357 If TYPE is NULL, determine symbol type from the die, otherwise
16358 used the passed type.
16359 If SPACE is not NULL, use it to hold the new symbol. If it is
16360 NULL, allocate a new symbol on the objfile's obstack. */
16362 static struct symbol *
16363 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
16364 struct symbol *space)
16366 struct objfile *objfile = cu->objfile;
16367 struct symbol *sym = NULL;
16369 struct attribute *attr = NULL;
16370 struct attribute *attr2 = NULL;
16371 CORE_ADDR baseaddr;
16372 struct pending **list_to_add = NULL;
16374 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
16376 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
16378 name = dwarf2_name (die, cu);
16381 const char *linkagename;
16382 int suppress_add = 0;
16387 sym = allocate_symbol (objfile);
16388 OBJSTAT (objfile, n_syms++);
16390 /* Cache this symbol's name and the name's demangled form (if any). */
16391 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
16392 linkagename = dwarf2_physname (name, die, cu);
16393 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
16395 /* Fortran does not have mangling standard and the mangling does differ
16396 between gfortran, iFort etc. */
16397 if (cu->language == language_fortran
16398 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
16399 symbol_set_demangled_name (&(sym->ginfo),
16400 dwarf2_full_name (name, die, cu),
16403 /* Default assumptions.
16404 Use the passed type or decode it from the die. */
16405 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16406 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16408 SYMBOL_TYPE (sym) = type;
16410 SYMBOL_TYPE (sym) = die_type (die, cu);
16411 attr = dwarf2_attr (die,
16412 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16416 SYMBOL_LINE (sym) = DW_UNSND (attr);
16419 attr = dwarf2_attr (die,
16420 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16424 int file_index = DW_UNSND (attr);
16426 if (cu->line_header == NULL
16427 || file_index > cu->line_header->num_file_names)
16428 complaint (&symfile_complaints,
16429 _("file index out of range"));
16430 else if (file_index > 0)
16432 struct file_entry *fe;
16434 fe = &cu->line_header->file_names[file_index - 1];
16435 SYMBOL_SYMTAB (sym) = fe->symtab;
16442 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16445 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16447 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16448 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16449 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16450 add_symbol_to_list (sym, cu->list_in_scope);
16452 case DW_TAG_subprogram:
16453 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16455 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16456 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16457 if ((attr2 && (DW_UNSND (attr2) != 0))
16458 || cu->language == language_ada)
16460 /* Subprograms marked external are stored as a global symbol.
16461 Ada subprograms, whether marked external or not, are always
16462 stored as a global symbol, because we want to be able to
16463 access them globally. For instance, we want to be able
16464 to break on a nested subprogram without having to
16465 specify the context. */
16466 list_to_add = &global_symbols;
16470 list_to_add = cu->list_in_scope;
16473 case DW_TAG_inlined_subroutine:
16474 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16476 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16477 SYMBOL_INLINED (sym) = 1;
16478 list_to_add = cu->list_in_scope;
16480 case DW_TAG_template_value_param:
16482 /* Fall through. */
16483 case DW_TAG_constant:
16484 case DW_TAG_variable:
16485 case DW_TAG_member:
16486 /* Compilation with minimal debug info may result in
16487 variables with missing type entries. Change the
16488 misleading `void' type to something sensible. */
16489 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16491 = objfile_type (objfile)->nodebug_data_symbol;
16493 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16494 /* In the case of DW_TAG_member, we should only be called for
16495 static const members. */
16496 if (die->tag == DW_TAG_member)
16498 /* dwarf2_add_field uses die_is_declaration,
16499 so we do the same. */
16500 gdb_assert (die_is_declaration (die, cu));
16505 dwarf2_const_value (attr, sym, cu);
16506 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16509 if (attr2 && (DW_UNSND (attr2) != 0))
16510 list_to_add = &global_symbols;
16512 list_to_add = cu->list_in_scope;
16516 attr = dwarf2_attr (die, DW_AT_location, cu);
16519 var_decode_location (attr, sym, cu);
16520 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16522 /* Fortran explicitly imports any global symbols to the local
16523 scope by DW_TAG_common_block. */
16524 if (cu->language == language_fortran && die->parent
16525 && die->parent->tag == DW_TAG_common_block)
16528 if (SYMBOL_CLASS (sym) == LOC_STATIC
16529 && SYMBOL_VALUE_ADDRESS (sym) == 0
16530 && !dwarf2_per_objfile->has_section_at_zero)
16532 /* When a static variable is eliminated by the linker,
16533 the corresponding debug information is not stripped
16534 out, but the variable address is set to null;
16535 do not add such variables into symbol table. */
16537 else if (attr2 && (DW_UNSND (attr2) != 0))
16539 /* Workaround gfortran PR debug/40040 - it uses
16540 DW_AT_location for variables in -fPIC libraries which may
16541 get overriden by other libraries/executable and get
16542 a different address. Resolve it by the minimal symbol
16543 which may come from inferior's executable using copy
16544 relocation. Make this workaround only for gfortran as for
16545 other compilers GDB cannot guess the minimal symbol
16546 Fortran mangling kind. */
16547 if (cu->language == language_fortran && die->parent
16548 && die->parent->tag == DW_TAG_module
16550 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16551 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16553 /* A variable with DW_AT_external is never static,
16554 but it may be block-scoped. */
16555 list_to_add = (cu->list_in_scope == &file_symbols
16556 ? &global_symbols : cu->list_in_scope);
16559 list_to_add = cu->list_in_scope;
16563 /* We do not know the address of this symbol.
16564 If it is an external symbol and we have type information
16565 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16566 The address of the variable will then be determined from
16567 the minimal symbol table whenever the variable is
16569 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16571 /* Fortran explicitly imports any global symbols to the local
16572 scope by DW_TAG_common_block. */
16573 if (cu->language == language_fortran && die->parent
16574 && die->parent->tag == DW_TAG_common_block)
16576 /* SYMBOL_CLASS doesn't matter here because
16577 read_common_block is going to reset it. */
16579 list_to_add = cu->list_in_scope;
16581 else if (attr2 && (DW_UNSND (attr2) != 0)
16582 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16584 /* A variable with DW_AT_external is never static, but it
16585 may be block-scoped. */
16586 list_to_add = (cu->list_in_scope == &file_symbols
16587 ? &global_symbols : cu->list_in_scope);
16589 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16591 else if (!die_is_declaration (die, cu))
16593 /* Use the default LOC_OPTIMIZED_OUT class. */
16594 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16596 list_to_add = cu->list_in_scope;
16600 case DW_TAG_formal_parameter:
16601 /* If we are inside a function, mark this as an argument. If
16602 not, we might be looking at an argument to an inlined function
16603 when we do not have enough information to show inlined frames;
16604 pretend it's a local variable in that case so that the user can
16606 if (context_stack_depth > 0
16607 && context_stack[context_stack_depth - 1].name != NULL)
16608 SYMBOL_IS_ARGUMENT (sym) = 1;
16609 attr = dwarf2_attr (die, DW_AT_location, cu);
16612 var_decode_location (attr, sym, cu);
16614 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16617 dwarf2_const_value (attr, sym, cu);
16620 list_to_add = cu->list_in_scope;
16622 case DW_TAG_unspecified_parameters:
16623 /* From varargs functions; gdb doesn't seem to have any
16624 interest in this information, so just ignore it for now.
16627 case DW_TAG_template_type_param:
16629 /* Fall through. */
16630 case DW_TAG_class_type:
16631 case DW_TAG_interface_type:
16632 case DW_TAG_structure_type:
16633 case DW_TAG_union_type:
16634 case DW_TAG_set_type:
16635 case DW_TAG_enumeration_type:
16636 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16637 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16640 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16641 really ever be static objects: otherwise, if you try
16642 to, say, break of a class's method and you're in a file
16643 which doesn't mention that class, it won't work unless
16644 the check for all static symbols in lookup_symbol_aux
16645 saves you. See the OtherFileClass tests in
16646 gdb.c++/namespace.exp. */
16650 list_to_add = (cu->list_in_scope == &file_symbols
16651 && (cu->language == language_cplus
16652 || cu->language == language_java)
16653 ? &global_symbols : cu->list_in_scope);
16655 /* The semantics of C++ state that "struct foo {
16656 ... }" also defines a typedef for "foo". A Java
16657 class declaration also defines a typedef for the
16659 if (cu->language == language_cplus
16660 || cu->language == language_java
16661 || cu->language == language_ada)
16663 /* The symbol's name is already allocated along
16664 with this objfile, so we don't need to
16665 duplicate it for the type. */
16666 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16667 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16672 case DW_TAG_typedef:
16673 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16674 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16675 list_to_add = cu->list_in_scope;
16677 case DW_TAG_base_type:
16678 case DW_TAG_subrange_type:
16679 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16680 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16681 list_to_add = cu->list_in_scope;
16683 case DW_TAG_enumerator:
16684 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16687 dwarf2_const_value (attr, sym, cu);
16690 /* NOTE: carlton/2003-11-10: See comment above in the
16691 DW_TAG_class_type, etc. block. */
16693 list_to_add = (cu->list_in_scope == &file_symbols
16694 && (cu->language == language_cplus
16695 || cu->language == language_java)
16696 ? &global_symbols : cu->list_in_scope);
16699 case DW_TAG_namespace:
16700 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16701 list_to_add = &global_symbols;
16703 case DW_TAG_common_block:
16704 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16705 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16706 add_symbol_to_list (sym, cu->list_in_scope);
16709 /* Not a tag we recognize. Hopefully we aren't processing
16710 trash data, but since we must specifically ignore things
16711 we don't recognize, there is nothing else we should do at
16713 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16714 dwarf_tag_name (die->tag));
16720 sym->hash_next = objfile->template_symbols;
16721 objfile->template_symbols = sym;
16722 list_to_add = NULL;
16725 if (list_to_add != NULL)
16726 add_symbol_to_list (sym, list_to_add);
16728 /* For the benefit of old versions of GCC, check for anonymous
16729 namespaces based on the demangled name. */
16730 if (!cu->processing_has_namespace_info
16731 && cu->language == language_cplus)
16732 cp_scan_for_anonymous_namespaces (sym, objfile);
16737 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16739 static struct symbol *
16740 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16742 return new_symbol_full (die, type, cu, NULL);
16745 /* Given an attr with a DW_FORM_dataN value in host byte order,
16746 zero-extend it as appropriate for the symbol's type. The DWARF
16747 standard (v4) is not entirely clear about the meaning of using
16748 DW_FORM_dataN for a constant with a signed type, where the type is
16749 wider than the data. The conclusion of a discussion on the DWARF
16750 list was that this is unspecified. We choose to always zero-extend
16751 because that is the interpretation long in use by GCC. */
16754 dwarf2_const_value_data (struct attribute *attr, struct obstack *obstack,
16755 struct dwarf2_cu *cu, LONGEST *value, int bits)
16757 struct objfile *objfile = cu->objfile;
16758 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16759 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16760 LONGEST l = DW_UNSND (attr);
16762 if (bits < sizeof (*value) * 8)
16764 l &= ((LONGEST) 1 << bits) - 1;
16767 else if (bits == sizeof (*value) * 8)
16771 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16772 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16779 /* Read a constant value from an attribute. Either set *VALUE, or if
16780 the value does not fit in *VALUE, set *BYTES - either already
16781 allocated on the objfile obstack, or newly allocated on OBSTACK,
16782 or, set *BATON, if we translated the constant to a location
16786 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16787 const char *name, struct obstack *obstack,
16788 struct dwarf2_cu *cu,
16789 LONGEST *value, const gdb_byte **bytes,
16790 struct dwarf2_locexpr_baton **baton)
16792 struct objfile *objfile = cu->objfile;
16793 struct comp_unit_head *cu_header = &cu->header;
16794 struct dwarf_block *blk;
16795 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16796 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16802 switch (attr->form)
16805 case DW_FORM_GNU_addr_index:
16809 if (TYPE_LENGTH (type) != cu_header->addr_size)
16810 dwarf2_const_value_length_mismatch_complaint (name,
16811 cu_header->addr_size,
16812 TYPE_LENGTH (type));
16813 /* Symbols of this form are reasonably rare, so we just
16814 piggyback on the existing location code rather than writing
16815 a new implementation of symbol_computed_ops. */
16816 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
16817 (*baton)->per_cu = cu->per_cu;
16818 gdb_assert ((*baton)->per_cu);
16820 (*baton)->size = 2 + cu_header->addr_size;
16821 data = obstack_alloc (obstack, (*baton)->size);
16822 (*baton)->data = data;
16824 data[0] = DW_OP_addr;
16825 store_unsigned_integer (&data[1], cu_header->addr_size,
16826 byte_order, DW_ADDR (attr));
16827 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16830 case DW_FORM_string:
16832 case DW_FORM_GNU_str_index:
16833 case DW_FORM_GNU_strp_alt:
16834 /* DW_STRING is already allocated on the objfile obstack, point
16836 *bytes = (const gdb_byte *) DW_STRING (attr);
16838 case DW_FORM_block1:
16839 case DW_FORM_block2:
16840 case DW_FORM_block4:
16841 case DW_FORM_block:
16842 case DW_FORM_exprloc:
16843 blk = DW_BLOCK (attr);
16844 if (TYPE_LENGTH (type) != blk->size)
16845 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16846 TYPE_LENGTH (type));
16847 *bytes = blk->data;
16850 /* The DW_AT_const_value attributes are supposed to carry the
16851 symbol's value "represented as it would be on the target
16852 architecture." By the time we get here, it's already been
16853 converted to host endianness, so we just need to sign- or
16854 zero-extend it as appropriate. */
16855 case DW_FORM_data1:
16856 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
16858 case DW_FORM_data2:
16859 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
16861 case DW_FORM_data4:
16862 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
16864 case DW_FORM_data8:
16865 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
16868 case DW_FORM_sdata:
16869 *value = DW_SND (attr);
16872 case DW_FORM_udata:
16873 *value = DW_UNSND (attr);
16877 complaint (&symfile_complaints,
16878 _("unsupported const value attribute form: '%s'"),
16879 dwarf_form_name (attr->form));
16886 /* Copy constant value from an attribute to a symbol. */
16889 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16890 struct dwarf2_cu *cu)
16892 struct objfile *objfile = cu->objfile;
16893 struct comp_unit_head *cu_header = &cu->header;
16895 const gdb_byte *bytes;
16896 struct dwarf2_locexpr_baton *baton;
16898 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16899 SYMBOL_PRINT_NAME (sym),
16900 &objfile->objfile_obstack, cu,
16901 &value, &bytes, &baton);
16905 SYMBOL_LOCATION_BATON (sym) = baton;
16906 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16908 else if (bytes != NULL)
16910 SYMBOL_VALUE_BYTES (sym) = bytes;
16911 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16915 SYMBOL_VALUE (sym) = value;
16916 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16920 /* Return the type of the die in question using its DW_AT_type attribute. */
16922 static struct type *
16923 die_type (struct die_info *die, struct dwarf2_cu *cu)
16925 struct attribute *type_attr;
16927 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16930 /* A missing DW_AT_type represents a void type. */
16931 return objfile_type (cu->objfile)->builtin_void;
16934 return lookup_die_type (die, type_attr, cu);
16937 /* True iff CU's producer generates GNAT Ada auxiliary information
16938 that allows to find parallel types through that information instead
16939 of having to do expensive parallel lookups by type name. */
16942 need_gnat_info (struct dwarf2_cu *cu)
16944 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16945 of GNAT produces this auxiliary information, without any indication
16946 that it is produced. Part of enhancing the FSF version of GNAT
16947 to produce that information will be to put in place an indicator
16948 that we can use in order to determine whether the descriptive type
16949 info is available or not. One suggestion that has been made is
16950 to use a new attribute, attached to the CU die. For now, assume
16951 that the descriptive type info is not available. */
16955 /* Return the auxiliary type of the die in question using its
16956 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16957 attribute is not present. */
16959 static struct type *
16960 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16962 struct attribute *type_attr;
16964 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
16968 return lookup_die_type (die, type_attr, cu);
16971 /* If DIE has a descriptive_type attribute, then set the TYPE's
16972 descriptive type accordingly. */
16975 set_descriptive_type (struct type *type, struct die_info *die,
16976 struct dwarf2_cu *cu)
16978 struct type *descriptive_type = die_descriptive_type (die, cu);
16980 if (descriptive_type)
16982 ALLOCATE_GNAT_AUX_TYPE (type);
16983 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
16987 /* Return the containing type of the die in question using its
16988 DW_AT_containing_type attribute. */
16990 static struct type *
16991 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
16993 struct attribute *type_attr;
16995 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
16997 error (_("Dwarf Error: Problem turning containing type into gdb type "
16998 "[in module %s]"), cu->objfile->name);
17000 return lookup_die_type (die, type_attr, cu);
17003 /* Return an error marker type to use for the ill formed type in DIE/CU. */
17005 static struct type *
17006 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
17008 struct objfile *objfile = dwarf2_per_objfile->objfile;
17009 char *message, *saved;
17011 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
17013 cu->header.offset.sect_off,
17014 die->offset.sect_off);
17015 saved = obstack_copy0 (&objfile->objfile_obstack,
17016 message, strlen (message));
17019 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
17022 /* Look up the type of DIE in CU using its type attribute ATTR.
17023 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
17024 DW_AT_containing_type.
17025 If there is no type substitute an error marker. */
17027 static struct type *
17028 lookup_die_type (struct die_info *die, struct attribute *attr,
17029 struct dwarf2_cu *cu)
17031 struct objfile *objfile = cu->objfile;
17032 struct type *this_type;
17034 gdb_assert (attr->name == DW_AT_type
17035 || attr->name == DW_AT_GNAT_descriptive_type
17036 || attr->name == DW_AT_containing_type);
17038 /* First see if we have it cached. */
17040 if (attr->form == DW_FORM_GNU_ref_alt)
17042 struct dwarf2_per_cu_data *per_cu;
17043 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17045 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
17046 this_type = get_die_type_at_offset (offset, per_cu);
17048 else if (is_ref_attr (attr))
17050 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17052 this_type = get_die_type_at_offset (offset, cu->per_cu);
17054 else if (attr->form == DW_FORM_ref_sig8)
17056 ULONGEST signature = DW_SIGNATURE (attr);
17058 return get_signatured_type (die, signature, cu);
17062 complaint (&symfile_complaints,
17063 _("Dwarf Error: Bad type attribute %s in DIE"
17064 " at 0x%x [in module %s]"),
17065 dwarf_attr_name (attr->name), die->offset.sect_off,
17067 return build_error_marker_type (cu, die);
17070 /* If not cached we need to read it in. */
17072 if (this_type == NULL)
17074 struct die_info *type_die = NULL;
17075 struct dwarf2_cu *type_cu = cu;
17077 if (is_ref_attr (attr))
17078 type_die = follow_die_ref (die, attr, &type_cu);
17079 if (type_die == NULL)
17080 return build_error_marker_type (cu, die);
17081 /* If we find the type now, it's probably because the type came
17082 from an inter-CU reference and the type's CU got expanded before
17084 this_type = read_type_die (type_die, type_cu);
17087 /* If we still don't have a type use an error marker. */
17089 if (this_type == NULL)
17090 return build_error_marker_type (cu, die);
17095 /* Return the type in DIE, CU.
17096 Returns NULL for invalid types.
17098 This first does a lookup in die_type_hash,
17099 and only reads the die in if necessary.
17101 NOTE: This can be called when reading in partial or full symbols. */
17103 static struct type *
17104 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
17106 struct type *this_type;
17108 this_type = get_die_type (die, cu);
17112 return read_type_die_1 (die, cu);
17115 /* Read the type in DIE, CU.
17116 Returns NULL for invalid types. */
17118 static struct type *
17119 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
17121 struct type *this_type = NULL;
17125 case DW_TAG_class_type:
17126 case DW_TAG_interface_type:
17127 case DW_TAG_structure_type:
17128 case DW_TAG_union_type:
17129 this_type = read_structure_type (die, cu);
17131 case DW_TAG_enumeration_type:
17132 this_type = read_enumeration_type (die, cu);
17134 case DW_TAG_subprogram:
17135 case DW_TAG_subroutine_type:
17136 case DW_TAG_inlined_subroutine:
17137 this_type = read_subroutine_type (die, cu);
17139 case DW_TAG_array_type:
17140 this_type = read_array_type (die, cu);
17142 case DW_TAG_set_type:
17143 this_type = read_set_type (die, cu);
17145 case DW_TAG_pointer_type:
17146 this_type = read_tag_pointer_type (die, cu);
17148 case DW_TAG_ptr_to_member_type:
17149 this_type = read_tag_ptr_to_member_type (die, cu);
17151 case DW_TAG_reference_type:
17152 this_type = read_tag_reference_type (die, cu);
17154 case DW_TAG_const_type:
17155 this_type = read_tag_const_type (die, cu);
17157 case DW_TAG_volatile_type:
17158 this_type = read_tag_volatile_type (die, cu);
17160 case DW_TAG_restrict_type:
17161 this_type = read_tag_restrict_type (die, cu);
17163 case DW_TAG_string_type:
17164 this_type = read_tag_string_type (die, cu);
17166 case DW_TAG_typedef:
17167 this_type = read_typedef (die, cu);
17169 case DW_TAG_subrange_type:
17170 this_type = read_subrange_type (die, cu);
17172 case DW_TAG_base_type:
17173 this_type = read_base_type (die, cu);
17175 case DW_TAG_unspecified_type:
17176 this_type = read_unspecified_type (die, cu);
17178 case DW_TAG_namespace:
17179 this_type = read_namespace_type (die, cu);
17181 case DW_TAG_module:
17182 this_type = read_module_type (die, cu);
17185 complaint (&symfile_complaints,
17186 _("unexpected tag in read_type_die: '%s'"),
17187 dwarf_tag_name (die->tag));
17194 /* See if we can figure out if the class lives in a namespace. We do
17195 this by looking for a member function; its demangled name will
17196 contain namespace info, if there is any.
17197 Return the computed name or NULL.
17198 Space for the result is allocated on the objfile's obstack.
17199 This is the full-die version of guess_partial_die_structure_name.
17200 In this case we know DIE has no useful parent. */
17203 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
17205 struct die_info *spec_die;
17206 struct dwarf2_cu *spec_cu;
17207 struct die_info *child;
17210 spec_die = die_specification (die, &spec_cu);
17211 if (spec_die != NULL)
17217 for (child = die->child;
17219 child = child->sibling)
17221 if (child->tag == DW_TAG_subprogram)
17223 struct attribute *attr;
17225 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
17227 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
17231 = language_class_name_from_physname (cu->language_defn,
17235 if (actual_name != NULL)
17237 const char *die_name = dwarf2_name (die, cu);
17239 if (die_name != NULL
17240 && strcmp (die_name, actual_name) != 0)
17242 /* Strip off the class name from the full name.
17243 We want the prefix. */
17244 int die_name_len = strlen (die_name);
17245 int actual_name_len = strlen (actual_name);
17247 /* Test for '::' as a sanity check. */
17248 if (actual_name_len > die_name_len + 2
17249 && actual_name[actual_name_len
17250 - die_name_len - 1] == ':')
17252 obstack_copy0 (&cu->objfile->objfile_obstack,
17254 actual_name_len - die_name_len - 2);
17257 xfree (actual_name);
17266 /* GCC might emit a nameless typedef that has a linkage name. Determine the
17267 prefix part in such case. See
17268 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17271 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
17273 struct attribute *attr;
17276 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
17277 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
17280 attr = dwarf2_attr (die, DW_AT_name, cu);
17281 if (attr != NULL && DW_STRING (attr) != NULL)
17284 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17286 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17287 if (attr == NULL || DW_STRING (attr) == NULL)
17290 /* dwarf2_name had to be already called. */
17291 gdb_assert (DW_STRING_IS_CANONICAL (attr));
17293 /* Strip the base name, keep any leading namespaces/classes. */
17294 base = strrchr (DW_STRING (attr), ':');
17295 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
17298 return obstack_copy0 (&cu->objfile->objfile_obstack,
17299 DW_STRING (attr), &base[-1] - DW_STRING (attr));
17302 /* Return the name of the namespace/class that DIE is defined within,
17303 or "" if we can't tell. The caller should not xfree the result.
17305 For example, if we're within the method foo() in the following
17315 then determine_prefix on foo's die will return "N::C". */
17317 static const char *
17318 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
17320 struct die_info *parent, *spec_die;
17321 struct dwarf2_cu *spec_cu;
17322 struct type *parent_type;
17325 if (cu->language != language_cplus && cu->language != language_java
17326 && cu->language != language_fortran)
17329 retval = anonymous_struct_prefix (die, cu);
17333 /* We have to be careful in the presence of DW_AT_specification.
17334 For example, with GCC 3.4, given the code
17338 // Definition of N::foo.
17342 then we'll have a tree of DIEs like this:
17344 1: DW_TAG_compile_unit
17345 2: DW_TAG_namespace // N
17346 3: DW_TAG_subprogram // declaration of N::foo
17347 4: DW_TAG_subprogram // definition of N::foo
17348 DW_AT_specification // refers to die #3
17350 Thus, when processing die #4, we have to pretend that we're in
17351 the context of its DW_AT_specification, namely the contex of die
17354 spec_die = die_specification (die, &spec_cu);
17355 if (spec_die == NULL)
17356 parent = die->parent;
17359 parent = spec_die->parent;
17363 if (parent == NULL)
17365 else if (parent->building_fullname)
17368 const char *parent_name;
17370 /* It has been seen on RealView 2.2 built binaries,
17371 DW_TAG_template_type_param types actually _defined_ as
17372 children of the parent class:
17375 template class <class Enum> Class{};
17376 Class<enum E> class_e;
17378 1: DW_TAG_class_type (Class)
17379 2: DW_TAG_enumeration_type (E)
17380 3: DW_TAG_enumerator (enum1:0)
17381 3: DW_TAG_enumerator (enum2:1)
17383 2: DW_TAG_template_type_param
17384 DW_AT_type DW_FORM_ref_udata (E)
17386 Besides being broken debug info, it can put GDB into an
17387 infinite loop. Consider:
17389 When we're building the full name for Class<E>, we'll start
17390 at Class, and go look over its template type parameters,
17391 finding E. We'll then try to build the full name of E, and
17392 reach here. We're now trying to build the full name of E,
17393 and look over the parent DIE for containing scope. In the
17394 broken case, if we followed the parent DIE of E, we'd again
17395 find Class, and once again go look at its template type
17396 arguments, etc., etc. Simply don't consider such parent die
17397 as source-level parent of this die (it can't be, the language
17398 doesn't allow it), and break the loop here. */
17399 name = dwarf2_name (die, cu);
17400 parent_name = dwarf2_name (parent, cu);
17401 complaint (&symfile_complaints,
17402 _("template param type '%s' defined within parent '%s'"),
17403 name ? name : "<unknown>",
17404 parent_name ? parent_name : "<unknown>");
17408 switch (parent->tag)
17410 case DW_TAG_namespace:
17411 parent_type = read_type_die (parent, cu);
17412 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17413 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17414 Work around this problem here. */
17415 if (cu->language == language_cplus
17416 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17418 /* We give a name to even anonymous namespaces. */
17419 return TYPE_TAG_NAME (parent_type);
17420 case DW_TAG_class_type:
17421 case DW_TAG_interface_type:
17422 case DW_TAG_structure_type:
17423 case DW_TAG_union_type:
17424 case DW_TAG_module:
17425 parent_type = read_type_die (parent, cu);
17426 if (TYPE_TAG_NAME (parent_type) != NULL)
17427 return TYPE_TAG_NAME (parent_type);
17429 /* An anonymous structure is only allowed non-static data
17430 members; no typedefs, no member functions, et cetera.
17431 So it does not need a prefix. */
17433 case DW_TAG_compile_unit:
17434 case DW_TAG_partial_unit:
17435 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17436 if (cu->language == language_cplus
17437 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17438 && die->child != NULL
17439 && (die->tag == DW_TAG_class_type
17440 || die->tag == DW_TAG_structure_type
17441 || die->tag == DW_TAG_union_type))
17443 char *name = guess_full_die_structure_name (die, cu);
17449 return determine_prefix (parent, cu);
17453 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17454 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17455 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17456 an obconcat, otherwise allocate storage for the result. The CU argument is
17457 used to determine the language and hence, the appropriate separator. */
17459 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17462 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17463 int physname, struct dwarf2_cu *cu)
17465 const char *lead = "";
17468 if (suffix == NULL || suffix[0] == '\0'
17469 || prefix == NULL || prefix[0] == '\0')
17471 else if (cu->language == language_java)
17473 else if (cu->language == language_fortran && physname)
17475 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17476 DW_AT_MIPS_linkage_name is preferred and used instead. */
17484 if (prefix == NULL)
17486 if (suffix == NULL)
17492 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17494 strcpy (retval, lead);
17495 strcat (retval, prefix);
17496 strcat (retval, sep);
17497 strcat (retval, suffix);
17502 /* We have an obstack. */
17503 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17507 /* Return sibling of die, NULL if no sibling. */
17509 static struct die_info *
17510 sibling_die (struct die_info *die)
17512 return die->sibling;
17515 /* Get name of a die, return NULL if not found. */
17517 static const char *
17518 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17519 struct obstack *obstack)
17521 if (name && cu->language == language_cplus)
17523 char *canon_name = cp_canonicalize_string (name);
17525 if (canon_name != NULL)
17527 if (strcmp (canon_name, name) != 0)
17528 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17529 xfree (canon_name);
17536 /* Get name of a die, return NULL if not found. */
17538 static const char *
17539 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17541 struct attribute *attr;
17543 attr = dwarf2_attr (die, DW_AT_name, cu);
17544 if ((!attr || !DW_STRING (attr))
17545 && die->tag != DW_TAG_class_type
17546 && die->tag != DW_TAG_interface_type
17547 && die->tag != DW_TAG_structure_type
17548 && die->tag != DW_TAG_union_type)
17553 case DW_TAG_compile_unit:
17554 case DW_TAG_partial_unit:
17555 /* Compilation units have a DW_AT_name that is a filename, not
17556 a source language identifier. */
17557 case DW_TAG_enumeration_type:
17558 case DW_TAG_enumerator:
17559 /* These tags always have simple identifiers already; no need
17560 to canonicalize them. */
17561 return DW_STRING (attr);
17563 case DW_TAG_subprogram:
17564 /* Java constructors will all be named "<init>", so return
17565 the class name when we see this special case. */
17566 if (cu->language == language_java
17567 && DW_STRING (attr) != NULL
17568 && strcmp (DW_STRING (attr), "<init>") == 0)
17570 struct dwarf2_cu *spec_cu = cu;
17571 struct die_info *spec_die;
17573 /* GCJ will output '<init>' for Java constructor names.
17574 For this special case, return the name of the parent class. */
17576 /* GCJ may output suprogram DIEs with AT_specification set.
17577 If so, use the name of the specified DIE. */
17578 spec_die = die_specification (die, &spec_cu);
17579 if (spec_die != NULL)
17580 return dwarf2_name (spec_die, spec_cu);
17585 if (die->tag == DW_TAG_class_type)
17586 return dwarf2_name (die, cu);
17588 while (die->tag != DW_TAG_compile_unit
17589 && die->tag != DW_TAG_partial_unit);
17593 case DW_TAG_class_type:
17594 case DW_TAG_interface_type:
17595 case DW_TAG_structure_type:
17596 case DW_TAG_union_type:
17597 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17598 structures or unions. These were of the form "._%d" in GCC 4.1,
17599 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17600 and GCC 4.4. We work around this problem by ignoring these. */
17601 if (attr && DW_STRING (attr)
17602 && (strncmp (DW_STRING (attr), "._", 2) == 0
17603 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17606 /* GCC might emit a nameless typedef that has a linkage name. See
17607 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17608 if (!attr || DW_STRING (attr) == NULL)
17610 char *demangled = NULL;
17612 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17614 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17616 if (attr == NULL || DW_STRING (attr) == NULL)
17619 /* Avoid demangling DW_STRING (attr) the second time on a second
17620 call for the same DIE. */
17621 if (!DW_STRING_IS_CANONICAL (attr))
17622 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17628 /* FIXME: we already did this for the partial symbol... */
17629 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17630 demangled, strlen (demangled));
17631 DW_STRING_IS_CANONICAL (attr) = 1;
17634 /* Strip any leading namespaces/classes, keep only the base name.
17635 DW_AT_name for named DIEs does not contain the prefixes. */
17636 base = strrchr (DW_STRING (attr), ':');
17637 if (base && base > DW_STRING (attr) && base[-1] == ':')
17640 return DW_STRING (attr);
17649 if (!DW_STRING_IS_CANONICAL (attr))
17652 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17653 &cu->objfile->objfile_obstack);
17654 DW_STRING_IS_CANONICAL (attr) = 1;
17656 return DW_STRING (attr);
17659 /* Return the die that this die in an extension of, or NULL if there
17660 is none. *EXT_CU is the CU containing DIE on input, and the CU
17661 containing the return value on output. */
17663 static struct die_info *
17664 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17666 struct attribute *attr;
17668 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17672 return follow_die_ref (die, attr, ext_cu);
17675 /* Convert a DIE tag into its string name. */
17677 static const char *
17678 dwarf_tag_name (unsigned tag)
17680 const char *name = get_DW_TAG_name (tag);
17683 return "DW_TAG_<unknown>";
17688 /* Convert a DWARF attribute code into its string name. */
17690 static const char *
17691 dwarf_attr_name (unsigned attr)
17695 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17696 if (attr == DW_AT_MIPS_fde)
17697 return "DW_AT_MIPS_fde";
17699 if (attr == DW_AT_HP_block_index)
17700 return "DW_AT_HP_block_index";
17703 name = get_DW_AT_name (attr);
17706 return "DW_AT_<unknown>";
17711 /* Convert a DWARF value form code into its string name. */
17713 static const char *
17714 dwarf_form_name (unsigned form)
17716 const char *name = get_DW_FORM_name (form);
17719 return "DW_FORM_<unknown>";
17725 dwarf_bool_name (unsigned mybool)
17733 /* Convert a DWARF type code into its string name. */
17735 static const char *
17736 dwarf_type_encoding_name (unsigned enc)
17738 const char *name = get_DW_ATE_name (enc);
17741 return "DW_ATE_<unknown>";
17747 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17751 print_spaces (indent, f);
17752 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17753 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17755 if (die->parent != NULL)
17757 print_spaces (indent, f);
17758 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17759 die->parent->offset.sect_off);
17762 print_spaces (indent, f);
17763 fprintf_unfiltered (f, " has children: %s\n",
17764 dwarf_bool_name (die->child != NULL));
17766 print_spaces (indent, f);
17767 fprintf_unfiltered (f, " attributes:\n");
17769 for (i = 0; i < die->num_attrs; ++i)
17771 print_spaces (indent, f);
17772 fprintf_unfiltered (f, " %s (%s) ",
17773 dwarf_attr_name (die->attrs[i].name),
17774 dwarf_form_name (die->attrs[i].form));
17776 switch (die->attrs[i].form)
17779 case DW_FORM_GNU_addr_index:
17780 fprintf_unfiltered (f, "address: ");
17781 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17783 case DW_FORM_block2:
17784 case DW_FORM_block4:
17785 case DW_FORM_block:
17786 case DW_FORM_block1:
17787 fprintf_unfiltered (f, "block: size %s",
17788 pulongest (DW_BLOCK (&die->attrs[i])->size));
17790 case DW_FORM_exprloc:
17791 fprintf_unfiltered (f, "expression: size %s",
17792 pulongest (DW_BLOCK (&die->attrs[i])->size));
17794 case DW_FORM_ref_addr:
17795 fprintf_unfiltered (f, "ref address: ");
17796 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17798 case DW_FORM_GNU_ref_alt:
17799 fprintf_unfiltered (f, "alt ref address: ");
17800 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17806 case DW_FORM_ref_udata:
17807 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17808 (long) (DW_UNSND (&die->attrs[i])));
17810 case DW_FORM_data1:
17811 case DW_FORM_data2:
17812 case DW_FORM_data4:
17813 case DW_FORM_data8:
17814 case DW_FORM_udata:
17815 case DW_FORM_sdata:
17816 fprintf_unfiltered (f, "constant: %s",
17817 pulongest (DW_UNSND (&die->attrs[i])));
17819 case DW_FORM_sec_offset:
17820 fprintf_unfiltered (f, "section offset: %s",
17821 pulongest (DW_UNSND (&die->attrs[i])));
17823 case DW_FORM_ref_sig8:
17824 fprintf_unfiltered (f, "signature: %s",
17825 hex_string (DW_SIGNATURE (&die->attrs[i])));
17827 case DW_FORM_string:
17829 case DW_FORM_GNU_str_index:
17830 case DW_FORM_GNU_strp_alt:
17831 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17832 DW_STRING (&die->attrs[i])
17833 ? DW_STRING (&die->attrs[i]) : "",
17834 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17837 if (DW_UNSND (&die->attrs[i]))
17838 fprintf_unfiltered (f, "flag: TRUE");
17840 fprintf_unfiltered (f, "flag: FALSE");
17842 case DW_FORM_flag_present:
17843 fprintf_unfiltered (f, "flag: TRUE");
17845 case DW_FORM_indirect:
17846 /* The reader will have reduced the indirect form to
17847 the "base form" so this form should not occur. */
17848 fprintf_unfiltered (f,
17849 "unexpected attribute form: DW_FORM_indirect");
17852 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17853 die->attrs[i].form);
17856 fprintf_unfiltered (f, "\n");
17861 dump_die_for_error (struct die_info *die)
17863 dump_die_shallow (gdb_stderr, 0, die);
17867 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17869 int indent = level * 4;
17871 gdb_assert (die != NULL);
17873 if (level >= max_level)
17876 dump_die_shallow (f, indent, die);
17878 if (die->child != NULL)
17880 print_spaces (indent, f);
17881 fprintf_unfiltered (f, " Children:");
17882 if (level + 1 < max_level)
17884 fprintf_unfiltered (f, "\n");
17885 dump_die_1 (f, level + 1, max_level, die->child);
17889 fprintf_unfiltered (f,
17890 " [not printed, max nesting level reached]\n");
17894 if (die->sibling != NULL && level > 0)
17896 dump_die_1 (f, level, max_level, die->sibling);
17900 /* This is called from the pdie macro in gdbinit.in.
17901 It's not static so gcc will keep a copy callable from gdb. */
17904 dump_die (struct die_info *die, int max_level)
17906 dump_die_1 (gdb_stdlog, 0, max_level, die);
17910 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17914 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17920 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17921 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17924 is_ref_attr (struct attribute *attr)
17926 switch (attr->form)
17928 case DW_FORM_ref_addr:
17933 case DW_FORM_ref_udata:
17934 case DW_FORM_GNU_ref_alt:
17941 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17945 dwarf2_get_ref_die_offset (struct attribute *attr)
17947 sect_offset retval = { DW_UNSND (attr) };
17949 if (is_ref_attr (attr))
17952 retval.sect_off = 0;
17953 complaint (&symfile_complaints,
17954 _("unsupported die ref attribute form: '%s'"),
17955 dwarf_form_name (attr->form));
17959 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17960 * the value held by the attribute is not constant. */
17963 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17965 if (attr->form == DW_FORM_sdata)
17966 return DW_SND (attr);
17967 else if (attr->form == DW_FORM_udata
17968 || attr->form == DW_FORM_data1
17969 || attr->form == DW_FORM_data2
17970 || attr->form == DW_FORM_data4
17971 || attr->form == DW_FORM_data8)
17972 return DW_UNSND (attr);
17975 complaint (&symfile_complaints,
17976 _("Attribute value is not a constant (%s)"),
17977 dwarf_form_name (attr->form));
17978 return default_value;
17982 /* Follow reference or signature attribute ATTR of SRC_DIE.
17983 On entry *REF_CU is the CU of SRC_DIE.
17984 On exit *REF_CU is the CU of the result. */
17986 static struct die_info *
17987 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
17988 struct dwarf2_cu **ref_cu)
17990 struct die_info *die;
17992 if (is_ref_attr (attr))
17993 die = follow_die_ref (src_die, attr, ref_cu);
17994 else if (attr->form == DW_FORM_ref_sig8)
17995 die = follow_die_sig (src_die, attr, ref_cu);
17998 dump_die_for_error (src_die);
17999 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
18000 (*ref_cu)->objfile->name);
18006 /* Follow reference OFFSET.
18007 On entry *REF_CU is the CU of the source die referencing OFFSET.
18008 On exit *REF_CU is the CU of the result.
18009 Returns NULL if OFFSET is invalid. */
18011 static struct die_info *
18012 follow_die_offset (sect_offset offset, int offset_in_dwz,
18013 struct dwarf2_cu **ref_cu)
18015 struct die_info temp_die;
18016 struct dwarf2_cu *target_cu, *cu = *ref_cu;
18018 gdb_assert (cu->per_cu != NULL);
18022 if (cu->per_cu->is_debug_types)
18024 /* .debug_types CUs cannot reference anything outside their CU.
18025 If they need to, they have to reference a signatured type via
18026 DW_FORM_ref_sig8. */
18027 if (! offset_in_cu_p (&cu->header, offset))
18030 else if (offset_in_dwz != cu->per_cu->is_dwz
18031 || ! offset_in_cu_p (&cu->header, offset))
18033 struct dwarf2_per_cu_data *per_cu;
18035 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
18038 /* If necessary, add it to the queue and load its DIEs. */
18039 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
18040 load_full_comp_unit (per_cu, cu->language);
18042 target_cu = per_cu->cu;
18044 else if (cu->dies == NULL)
18046 /* We're loading full DIEs during partial symbol reading. */
18047 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
18048 load_full_comp_unit (cu->per_cu, language_minimal);
18051 *ref_cu = target_cu;
18052 temp_die.offset = offset;
18053 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
18056 /* Follow reference attribute ATTR of SRC_DIE.
18057 On entry *REF_CU is the CU of SRC_DIE.
18058 On exit *REF_CU is the CU of the result. */
18060 static struct die_info *
18061 follow_die_ref (struct die_info *src_die, struct attribute *attr,
18062 struct dwarf2_cu **ref_cu)
18064 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18065 struct dwarf2_cu *cu = *ref_cu;
18066 struct die_info *die;
18068 die = follow_die_offset (offset,
18069 (attr->form == DW_FORM_GNU_ref_alt
18070 || cu->per_cu->is_dwz),
18073 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
18074 "at 0x%x [in module %s]"),
18075 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
18080 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
18081 Returned value is intended for DW_OP_call*. Returned
18082 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
18084 struct dwarf2_locexpr_baton
18085 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
18086 struct dwarf2_per_cu_data *per_cu,
18087 CORE_ADDR (*get_frame_pc) (void *baton),
18090 struct dwarf2_cu *cu;
18091 struct die_info *die;
18092 struct attribute *attr;
18093 struct dwarf2_locexpr_baton retval;
18095 dw2_setup (per_cu->objfile);
18097 if (per_cu->cu == NULL)
18101 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18103 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18104 offset.sect_off, per_cu->objfile->name);
18106 attr = dwarf2_attr (die, DW_AT_location, cu);
18109 /* DWARF: "If there is no such attribute, then there is no effect.".
18110 DATA is ignored if SIZE is 0. */
18112 retval.data = NULL;
18115 else if (attr_form_is_section_offset (attr))
18117 struct dwarf2_loclist_baton loclist_baton;
18118 CORE_ADDR pc = (*get_frame_pc) (baton);
18121 fill_in_loclist_baton (cu, &loclist_baton, attr);
18123 retval.data = dwarf2_find_location_expression (&loclist_baton,
18125 retval.size = size;
18129 if (!attr_form_is_block (attr))
18130 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
18131 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
18132 offset.sect_off, per_cu->objfile->name);
18134 retval.data = DW_BLOCK (attr)->data;
18135 retval.size = DW_BLOCK (attr)->size;
18137 retval.per_cu = cu->per_cu;
18139 age_cached_comp_units ();
18144 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
18147 struct dwarf2_locexpr_baton
18148 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
18149 struct dwarf2_per_cu_data *per_cu,
18150 CORE_ADDR (*get_frame_pc) (void *baton),
18153 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
18155 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
18158 /* Write a constant of a given type as target-ordered bytes into
18161 static const gdb_byte *
18162 write_constant_as_bytes (struct obstack *obstack,
18163 enum bfd_endian byte_order,
18170 *len = TYPE_LENGTH (type);
18171 result = obstack_alloc (obstack, *len);
18172 store_unsigned_integer (result, *len, byte_order, value);
18177 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
18178 pointer to the constant bytes and set LEN to the length of the
18179 data. If memory is needed, allocate it on OBSTACK. If the DIE
18180 does not have a DW_AT_const_value, return NULL. */
18183 dwarf2_fetch_constant_bytes (sect_offset offset,
18184 struct dwarf2_per_cu_data *per_cu,
18185 struct obstack *obstack,
18188 struct dwarf2_cu *cu;
18189 struct die_info *die;
18190 struct attribute *attr;
18191 const gdb_byte *result = NULL;
18194 enum bfd_endian byte_order;
18196 dw2_setup (per_cu->objfile);
18198 if (per_cu->cu == NULL)
18202 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18204 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18205 offset.sect_off, per_cu->objfile->name);
18208 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18212 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
18213 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18215 switch (attr->form)
18218 case DW_FORM_GNU_addr_index:
18222 *len = cu->header.addr_size;
18223 tem = obstack_alloc (obstack, *len);
18224 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
18228 case DW_FORM_string:
18230 case DW_FORM_GNU_str_index:
18231 case DW_FORM_GNU_strp_alt:
18232 /* DW_STRING is already allocated on the objfile obstack, point
18234 result = (const gdb_byte *) DW_STRING (attr);
18235 *len = strlen (DW_STRING (attr));
18237 case DW_FORM_block1:
18238 case DW_FORM_block2:
18239 case DW_FORM_block4:
18240 case DW_FORM_block:
18241 case DW_FORM_exprloc:
18242 result = DW_BLOCK (attr)->data;
18243 *len = DW_BLOCK (attr)->size;
18246 /* The DW_AT_const_value attributes are supposed to carry the
18247 symbol's value "represented as it would be on the target
18248 architecture." By the time we get here, it's already been
18249 converted to host endianness, so we just need to sign- or
18250 zero-extend it as appropriate. */
18251 case DW_FORM_data1:
18252 type = die_type (die, cu);
18253 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
18254 if (result == NULL)
18255 result = write_constant_as_bytes (obstack, byte_order,
18258 case DW_FORM_data2:
18259 type = die_type (die, cu);
18260 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
18261 if (result == NULL)
18262 result = write_constant_as_bytes (obstack, byte_order,
18265 case DW_FORM_data4:
18266 type = die_type (die, cu);
18267 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
18268 if (result == NULL)
18269 result = write_constant_as_bytes (obstack, byte_order,
18272 case DW_FORM_data8:
18273 type = die_type (die, cu);
18274 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
18275 if (result == NULL)
18276 result = write_constant_as_bytes (obstack, byte_order,
18280 case DW_FORM_sdata:
18281 type = die_type (die, cu);
18282 result = write_constant_as_bytes (obstack, byte_order,
18283 type, DW_SND (attr), len);
18286 case DW_FORM_udata:
18287 type = die_type (die, cu);
18288 result = write_constant_as_bytes (obstack, byte_order,
18289 type, DW_UNSND (attr), len);
18293 complaint (&symfile_complaints,
18294 _("unsupported const value attribute form: '%s'"),
18295 dwarf_form_name (attr->form));
18302 /* Return the type of the DIE at DIE_OFFSET in the CU named by
18306 dwarf2_get_die_type (cu_offset die_offset,
18307 struct dwarf2_per_cu_data *per_cu)
18309 sect_offset die_offset_sect;
18311 dw2_setup (per_cu->objfile);
18313 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
18314 return get_die_type_at_offset (die_offset_sect, per_cu);
18317 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
18318 On entry *REF_CU is the CU of SRC_DIE.
18319 On exit *REF_CU is the CU of the result.
18320 Returns NULL if the referenced DIE isn't found. */
18322 static struct die_info *
18323 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
18324 struct dwarf2_cu **ref_cu)
18326 struct objfile *objfile = (*ref_cu)->objfile;
18327 struct die_info temp_die;
18328 struct dwarf2_cu *sig_cu;
18329 struct die_info *die;
18331 /* While it might be nice to assert sig_type->type == NULL here,
18332 we can get here for DW_AT_imported_declaration where we need
18333 the DIE not the type. */
18335 /* If necessary, add it to the queue and load its DIEs. */
18337 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
18338 read_signatured_type (sig_type);
18340 gdb_assert (sig_type->per_cu.cu != NULL);
18342 sig_cu = sig_type->per_cu.cu;
18343 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
18344 temp_die.offset = sig_type->type_offset_in_section;
18345 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
18346 temp_die.offset.sect_off);
18349 /* For .gdb_index version 7 keep track of included TUs.
18350 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
18351 if (dwarf2_per_objfile->index_table != NULL
18352 && dwarf2_per_objfile->index_table->version <= 7)
18354 VEC_safe_push (dwarf2_per_cu_ptr,
18355 (*ref_cu)->per_cu->imported_symtabs,
18366 /* Follow signatured type referenced by ATTR in SRC_DIE.
18367 On entry *REF_CU is the CU of SRC_DIE.
18368 On exit *REF_CU is the CU of the result.
18369 The result is the DIE of the type.
18370 If the referenced type cannot be found an error is thrown. */
18372 static struct die_info *
18373 follow_die_sig (struct die_info *src_die, struct attribute *attr,
18374 struct dwarf2_cu **ref_cu)
18376 ULONGEST signature = DW_SIGNATURE (attr);
18377 struct signatured_type *sig_type;
18378 struct die_info *die;
18380 gdb_assert (attr->form == DW_FORM_ref_sig8);
18382 sig_type = lookup_signatured_type (*ref_cu, signature);
18383 /* sig_type will be NULL if the signatured type is missing from
18385 if (sig_type == NULL)
18387 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
18388 " from DIE at 0x%x [in module %s]"),
18389 hex_string (signature), src_die->offset.sect_off,
18390 (*ref_cu)->objfile->name);
18393 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
18396 dump_die_for_error (src_die);
18397 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
18398 " from DIE at 0x%x [in module %s]"),
18399 hex_string (signature), src_die->offset.sect_off,
18400 (*ref_cu)->objfile->name);
18406 /* Get the type specified by SIGNATURE referenced in DIE/CU,
18407 reading in and processing the type unit if necessary. */
18409 static struct type *
18410 get_signatured_type (struct die_info *die, ULONGEST signature,
18411 struct dwarf2_cu *cu)
18413 struct signatured_type *sig_type;
18414 struct dwarf2_cu *type_cu;
18415 struct die_info *type_die;
18418 sig_type = lookup_signatured_type (cu, signature);
18419 /* sig_type will be NULL if the signatured type is missing from
18421 if (sig_type == NULL)
18423 complaint (&symfile_complaints,
18424 _("Dwarf Error: Cannot find signatured DIE %s referenced"
18425 " from DIE at 0x%x [in module %s]"),
18426 hex_string (signature), die->offset.sect_off,
18427 dwarf2_per_objfile->objfile->name);
18428 return build_error_marker_type (cu, die);
18431 /* If we already know the type we're done. */
18432 if (sig_type->type != NULL)
18433 return sig_type->type;
18436 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
18437 if (type_die != NULL)
18439 /* N.B. We need to call get_die_type to ensure only one type for this DIE
18440 is created. This is important, for example, because for c++ classes
18441 we need TYPE_NAME set which is only done by new_symbol. Blech. */
18442 type = read_type_die (type_die, type_cu);
18445 complaint (&symfile_complaints,
18446 _("Dwarf Error: Cannot build signatured type %s"
18447 " referenced from DIE at 0x%x [in module %s]"),
18448 hex_string (signature), die->offset.sect_off,
18449 dwarf2_per_objfile->objfile->name);
18450 type = build_error_marker_type (cu, die);
18455 complaint (&symfile_complaints,
18456 _("Dwarf Error: Problem reading signatured DIE %s referenced"
18457 " from DIE at 0x%x [in module %s]"),
18458 hex_string (signature), die->offset.sect_off,
18459 dwarf2_per_objfile->objfile->name);
18460 type = build_error_marker_type (cu, die);
18462 sig_type->type = type;
18467 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
18468 reading in and processing the type unit if necessary. */
18470 static struct type *
18471 get_DW_AT_signature_type (struct die_info *die, struct attribute *attr,
18472 struct dwarf2_cu *cu) /* ARI: editCase function */
18474 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
18475 if (is_ref_attr (attr))
18477 struct dwarf2_cu *type_cu = cu;
18478 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
18480 return read_type_die (type_die, type_cu);
18482 else if (attr->form == DW_FORM_ref_sig8)
18484 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
18488 complaint (&symfile_complaints,
18489 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
18490 " at 0x%x [in module %s]"),
18491 dwarf_form_name (attr->form), die->offset.sect_off,
18492 dwarf2_per_objfile->objfile->name);
18493 return build_error_marker_type (cu, die);
18497 /* Load the DIEs associated with type unit PER_CU into memory. */
18500 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
18502 struct signatured_type *sig_type;
18504 /* Caller is responsible for ensuring type_unit_groups don't get here. */
18505 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
18507 /* We have the per_cu, but we need the signatured_type.
18508 Fortunately this is an easy translation. */
18509 gdb_assert (per_cu->is_debug_types);
18510 sig_type = (struct signatured_type *) per_cu;
18512 gdb_assert (per_cu->cu == NULL);
18514 read_signatured_type (sig_type);
18516 gdb_assert (per_cu->cu != NULL);
18519 /* die_reader_func for read_signatured_type.
18520 This is identical to load_full_comp_unit_reader,
18521 but is kept separate for now. */
18524 read_signatured_type_reader (const struct die_reader_specs *reader,
18525 const gdb_byte *info_ptr,
18526 struct die_info *comp_unit_die,
18530 struct dwarf2_cu *cu = reader->cu;
18532 gdb_assert (cu->die_hash == NULL);
18534 htab_create_alloc_ex (cu->header.length / 12,
18538 &cu->comp_unit_obstack,
18539 hashtab_obstack_allocate,
18540 dummy_obstack_deallocate);
18543 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18544 &info_ptr, comp_unit_die);
18545 cu->dies = comp_unit_die;
18546 /* comp_unit_die is not stored in die_hash, no need. */
18548 /* We try not to read any attributes in this function, because not
18549 all CUs needed for references have been loaded yet, and symbol
18550 table processing isn't initialized. But we have to set the CU language,
18551 or we won't be able to build types correctly.
18552 Similarly, if we do not read the producer, we can not apply
18553 producer-specific interpretation. */
18554 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18557 /* Read in a signatured type and build its CU and DIEs.
18558 If the type is a stub for the real type in a DWO file,
18559 read in the real type from the DWO file as well. */
18562 read_signatured_type (struct signatured_type *sig_type)
18564 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18566 gdb_assert (per_cu->is_debug_types);
18567 gdb_assert (per_cu->cu == NULL);
18569 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18570 read_signatured_type_reader, NULL);
18573 /* Decode simple location descriptions.
18574 Given a pointer to a dwarf block that defines a location, compute
18575 the location and return the value.
18577 NOTE drow/2003-11-18: This function is called in two situations
18578 now: for the address of static or global variables (partial symbols
18579 only) and for offsets into structures which are expected to be
18580 (more or less) constant. The partial symbol case should go away,
18581 and only the constant case should remain. That will let this
18582 function complain more accurately. A few special modes are allowed
18583 without complaint for global variables (for instance, global
18584 register values and thread-local values).
18586 A location description containing no operations indicates that the
18587 object is optimized out. The return value is 0 for that case.
18588 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18589 callers will only want a very basic result and this can become a
18592 Note that stack[0] is unused except as a default error return. */
18595 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18597 struct objfile *objfile = cu->objfile;
18599 size_t size = blk->size;
18600 const gdb_byte *data = blk->data;
18601 CORE_ADDR stack[64];
18603 unsigned int bytes_read, unsnd;
18609 stack[++stacki] = 0;
18648 stack[++stacki] = op - DW_OP_lit0;
18683 stack[++stacki] = op - DW_OP_reg0;
18685 dwarf2_complex_location_expr_complaint ();
18689 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18691 stack[++stacki] = unsnd;
18693 dwarf2_complex_location_expr_complaint ();
18697 stack[++stacki] = read_address (objfile->obfd, &data[i],
18702 case DW_OP_const1u:
18703 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18707 case DW_OP_const1s:
18708 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18712 case DW_OP_const2u:
18713 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18717 case DW_OP_const2s:
18718 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18722 case DW_OP_const4u:
18723 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18727 case DW_OP_const4s:
18728 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18732 case DW_OP_const8u:
18733 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18738 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18744 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18749 stack[stacki + 1] = stack[stacki];
18754 stack[stacki - 1] += stack[stacki];
18758 case DW_OP_plus_uconst:
18759 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18765 stack[stacki - 1] -= stack[stacki];
18770 /* If we're not the last op, then we definitely can't encode
18771 this using GDB's address_class enum. This is valid for partial
18772 global symbols, although the variable's address will be bogus
18775 dwarf2_complex_location_expr_complaint ();
18778 case DW_OP_GNU_push_tls_address:
18779 /* The top of the stack has the offset from the beginning
18780 of the thread control block at which the variable is located. */
18781 /* Nothing should follow this operator, so the top of stack would
18783 /* This is valid for partial global symbols, but the variable's
18784 address will be bogus in the psymtab. Make it always at least
18785 non-zero to not look as a variable garbage collected by linker
18786 which have DW_OP_addr 0. */
18788 dwarf2_complex_location_expr_complaint ();
18792 case DW_OP_GNU_uninit:
18795 case DW_OP_GNU_addr_index:
18796 case DW_OP_GNU_const_index:
18797 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18804 const char *name = get_DW_OP_name (op);
18807 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18810 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18814 return (stack[stacki]);
18817 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18818 outside of the allocated space. Also enforce minimum>0. */
18819 if (stacki >= ARRAY_SIZE (stack) - 1)
18821 complaint (&symfile_complaints,
18822 _("location description stack overflow"));
18828 complaint (&symfile_complaints,
18829 _("location description stack underflow"));
18833 return (stack[stacki]);
18836 /* memory allocation interface */
18838 static struct dwarf_block *
18839 dwarf_alloc_block (struct dwarf2_cu *cu)
18841 struct dwarf_block *blk;
18843 blk = (struct dwarf_block *)
18844 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18848 static struct die_info *
18849 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18851 struct die_info *die;
18852 size_t size = sizeof (struct die_info);
18855 size += (num_attrs - 1) * sizeof (struct attribute);
18857 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18858 memset (die, 0, sizeof (struct die_info));
18863 /* Macro support. */
18865 /* Return file name relative to the compilation directory of file number I in
18866 *LH's file name table. The result is allocated using xmalloc; the caller is
18867 responsible for freeing it. */
18870 file_file_name (int file, struct line_header *lh)
18872 /* Is the file number a valid index into the line header's file name
18873 table? Remember that file numbers start with one, not zero. */
18874 if (1 <= file && file <= lh->num_file_names)
18876 struct file_entry *fe = &lh->file_names[file - 1];
18878 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18879 return xstrdup (fe->name);
18880 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18885 /* The compiler produced a bogus file number. We can at least
18886 record the macro definitions made in the file, even if we
18887 won't be able to find the file by name. */
18888 char fake_name[80];
18890 xsnprintf (fake_name, sizeof (fake_name),
18891 "<bad macro file number %d>", file);
18893 complaint (&symfile_complaints,
18894 _("bad file number in macro information (%d)"),
18897 return xstrdup (fake_name);
18901 /* Return the full name of file number I in *LH's file name table.
18902 Use COMP_DIR as the name of the current directory of the
18903 compilation. The result is allocated using xmalloc; the caller is
18904 responsible for freeing it. */
18906 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18908 /* Is the file number a valid index into the line header's file name
18909 table? Remember that file numbers start with one, not zero. */
18910 if (1 <= file && file <= lh->num_file_names)
18912 char *relative = file_file_name (file, lh);
18914 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18916 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18919 return file_file_name (file, lh);
18923 static struct macro_source_file *
18924 macro_start_file (int file, int line,
18925 struct macro_source_file *current_file,
18926 const char *comp_dir,
18927 struct line_header *lh, struct objfile *objfile)
18929 /* File name relative to the compilation directory of this source file. */
18930 char *file_name = file_file_name (file, lh);
18932 /* We don't create a macro table for this compilation unit
18933 at all until we actually get a filename. */
18934 if (! pending_macros)
18935 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18936 objfile->per_bfd->macro_cache,
18939 if (! current_file)
18941 /* If we have no current file, then this must be the start_file
18942 directive for the compilation unit's main source file. */
18943 current_file = macro_set_main (pending_macros, file_name);
18944 macro_define_special (pending_macros);
18947 current_file = macro_include (current_file, line, file_name);
18951 return current_file;
18955 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18956 followed by a null byte. */
18958 copy_string (const char *buf, int len)
18960 char *s = xmalloc (len + 1);
18962 memcpy (s, buf, len);
18968 static const char *
18969 consume_improper_spaces (const char *p, const char *body)
18973 complaint (&symfile_complaints,
18974 _("macro definition contains spaces "
18975 "in formal argument list:\n`%s'"),
18987 parse_macro_definition (struct macro_source_file *file, int line,
18992 /* The body string takes one of two forms. For object-like macro
18993 definitions, it should be:
18995 <macro name> " " <definition>
18997 For function-like macro definitions, it should be:
18999 <macro name> "() " <definition>
19001 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
19003 Spaces may appear only where explicitly indicated, and in the
19006 The Dwarf 2 spec says that an object-like macro's name is always
19007 followed by a space, but versions of GCC around March 2002 omit
19008 the space when the macro's definition is the empty string.
19010 The Dwarf 2 spec says that there should be no spaces between the
19011 formal arguments in a function-like macro's formal argument list,
19012 but versions of GCC around March 2002 include spaces after the
19016 /* Find the extent of the macro name. The macro name is terminated
19017 by either a space or null character (for an object-like macro) or
19018 an opening paren (for a function-like macro). */
19019 for (p = body; *p; p++)
19020 if (*p == ' ' || *p == '(')
19023 if (*p == ' ' || *p == '\0')
19025 /* It's an object-like macro. */
19026 int name_len = p - body;
19027 char *name = copy_string (body, name_len);
19028 const char *replacement;
19031 replacement = body + name_len + 1;
19034 dwarf2_macro_malformed_definition_complaint (body);
19035 replacement = body + name_len;
19038 macro_define_object (file, line, name, replacement);
19042 else if (*p == '(')
19044 /* It's a function-like macro. */
19045 char *name = copy_string (body, p - body);
19048 char **argv = xmalloc (argv_size * sizeof (*argv));
19052 p = consume_improper_spaces (p, body);
19054 /* Parse the formal argument list. */
19055 while (*p && *p != ')')
19057 /* Find the extent of the current argument name. */
19058 const char *arg_start = p;
19060 while (*p && *p != ',' && *p != ')' && *p != ' ')
19063 if (! *p || p == arg_start)
19064 dwarf2_macro_malformed_definition_complaint (body);
19067 /* Make sure argv has room for the new argument. */
19068 if (argc >= argv_size)
19071 argv = xrealloc (argv, argv_size * sizeof (*argv));
19074 argv[argc++] = copy_string (arg_start, p - arg_start);
19077 p = consume_improper_spaces (p, body);
19079 /* Consume the comma, if present. */
19084 p = consume_improper_spaces (p, body);
19093 /* Perfectly formed definition, no complaints. */
19094 macro_define_function (file, line, name,
19095 argc, (const char **) argv,
19097 else if (*p == '\0')
19099 /* Complain, but do define it. */
19100 dwarf2_macro_malformed_definition_complaint (body);
19101 macro_define_function (file, line, name,
19102 argc, (const char **) argv,
19106 /* Just complain. */
19107 dwarf2_macro_malformed_definition_complaint (body);
19110 /* Just complain. */
19111 dwarf2_macro_malformed_definition_complaint (body);
19117 for (i = 0; i < argc; i++)
19123 dwarf2_macro_malformed_definition_complaint (body);
19126 /* Skip some bytes from BYTES according to the form given in FORM.
19127 Returns the new pointer. */
19129 static const gdb_byte *
19130 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
19131 enum dwarf_form form,
19132 unsigned int offset_size,
19133 struct dwarf2_section_info *section)
19135 unsigned int bytes_read;
19139 case DW_FORM_data1:
19144 case DW_FORM_data2:
19148 case DW_FORM_data4:
19152 case DW_FORM_data8:
19156 case DW_FORM_string:
19157 read_direct_string (abfd, bytes, &bytes_read);
19158 bytes += bytes_read;
19161 case DW_FORM_sec_offset:
19163 case DW_FORM_GNU_strp_alt:
19164 bytes += offset_size;
19167 case DW_FORM_block:
19168 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
19169 bytes += bytes_read;
19172 case DW_FORM_block1:
19173 bytes += 1 + read_1_byte (abfd, bytes);
19175 case DW_FORM_block2:
19176 bytes += 2 + read_2_bytes (abfd, bytes);
19178 case DW_FORM_block4:
19179 bytes += 4 + read_4_bytes (abfd, bytes);
19182 case DW_FORM_sdata:
19183 case DW_FORM_udata:
19184 case DW_FORM_GNU_addr_index:
19185 case DW_FORM_GNU_str_index:
19186 bytes = gdb_skip_leb128 (bytes, buffer_end);
19189 dwarf2_section_buffer_overflow_complaint (section);
19197 complaint (&symfile_complaints,
19198 _("invalid form 0x%x in `%s'"),
19200 section->asection->name);
19208 /* A helper for dwarf_decode_macros that handles skipping an unknown
19209 opcode. Returns an updated pointer to the macro data buffer; or,
19210 on error, issues a complaint and returns NULL. */
19212 static const gdb_byte *
19213 skip_unknown_opcode (unsigned int opcode,
19214 const gdb_byte **opcode_definitions,
19215 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19217 unsigned int offset_size,
19218 struct dwarf2_section_info *section)
19220 unsigned int bytes_read, i;
19222 const gdb_byte *defn;
19224 if (opcode_definitions[opcode] == NULL)
19226 complaint (&symfile_complaints,
19227 _("unrecognized DW_MACFINO opcode 0x%x"),
19232 defn = opcode_definitions[opcode];
19233 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
19234 defn += bytes_read;
19236 for (i = 0; i < arg; ++i)
19238 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
19240 if (mac_ptr == NULL)
19242 /* skip_form_bytes already issued the complaint. */
19250 /* A helper function which parses the header of a macro section.
19251 If the macro section is the extended (for now called "GNU") type,
19252 then this updates *OFFSET_SIZE. Returns a pointer to just after
19253 the header, or issues a complaint and returns NULL on error. */
19255 static const gdb_byte *
19256 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
19258 const gdb_byte *mac_ptr,
19259 unsigned int *offset_size,
19260 int section_is_gnu)
19262 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
19264 if (section_is_gnu)
19266 unsigned int version, flags;
19268 version = read_2_bytes (abfd, mac_ptr);
19271 complaint (&symfile_complaints,
19272 _("unrecognized version `%d' in .debug_macro section"),
19278 flags = read_1_byte (abfd, mac_ptr);
19280 *offset_size = (flags & 1) ? 8 : 4;
19282 if ((flags & 2) != 0)
19283 /* We don't need the line table offset. */
19284 mac_ptr += *offset_size;
19286 /* Vendor opcode descriptions. */
19287 if ((flags & 4) != 0)
19289 unsigned int i, count;
19291 count = read_1_byte (abfd, mac_ptr);
19293 for (i = 0; i < count; ++i)
19295 unsigned int opcode, bytes_read;
19298 opcode = read_1_byte (abfd, mac_ptr);
19300 opcode_definitions[opcode] = mac_ptr;
19301 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19302 mac_ptr += bytes_read;
19311 /* A helper for dwarf_decode_macros that handles the GNU extensions,
19312 including DW_MACRO_GNU_transparent_include. */
19315 dwarf_decode_macro_bytes (bfd *abfd,
19316 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19317 struct macro_source_file *current_file,
19318 struct line_header *lh, const char *comp_dir,
19319 struct dwarf2_section_info *section,
19320 int section_is_gnu, int section_is_dwz,
19321 unsigned int offset_size,
19322 struct objfile *objfile,
19323 htab_t include_hash)
19325 enum dwarf_macro_record_type macinfo_type;
19326 int at_commandline;
19327 const gdb_byte *opcode_definitions[256];
19329 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19330 &offset_size, section_is_gnu);
19331 if (mac_ptr == NULL)
19333 /* We already issued a complaint. */
19337 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
19338 GDB is still reading the definitions from command line. First
19339 DW_MACINFO_start_file will need to be ignored as it was already executed
19340 to create CURRENT_FILE for the main source holding also the command line
19341 definitions. On first met DW_MACINFO_start_file this flag is reset to
19342 normally execute all the remaining DW_MACINFO_start_file macinfos. */
19344 at_commandline = 1;
19348 /* Do we at least have room for a macinfo type byte? */
19349 if (mac_ptr >= mac_end)
19351 dwarf2_section_buffer_overflow_complaint (section);
19355 macinfo_type = read_1_byte (abfd, mac_ptr);
19358 /* Note that we rely on the fact that the corresponding GNU and
19359 DWARF constants are the same. */
19360 switch (macinfo_type)
19362 /* A zero macinfo type indicates the end of the macro
19367 case DW_MACRO_GNU_define:
19368 case DW_MACRO_GNU_undef:
19369 case DW_MACRO_GNU_define_indirect:
19370 case DW_MACRO_GNU_undef_indirect:
19371 case DW_MACRO_GNU_define_indirect_alt:
19372 case DW_MACRO_GNU_undef_indirect_alt:
19374 unsigned int bytes_read;
19379 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19380 mac_ptr += bytes_read;
19382 if (macinfo_type == DW_MACRO_GNU_define
19383 || macinfo_type == DW_MACRO_GNU_undef)
19385 body = read_direct_string (abfd, mac_ptr, &bytes_read);
19386 mac_ptr += bytes_read;
19390 LONGEST str_offset;
19392 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
19393 mac_ptr += offset_size;
19395 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
19396 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
19399 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19401 body = read_indirect_string_from_dwz (dwz, str_offset);
19404 body = read_indirect_string_at_offset (abfd, str_offset);
19407 is_define = (macinfo_type == DW_MACRO_GNU_define
19408 || macinfo_type == DW_MACRO_GNU_define_indirect
19409 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
19410 if (! current_file)
19412 /* DWARF violation as no main source is present. */
19413 complaint (&symfile_complaints,
19414 _("debug info with no main source gives macro %s "
19416 is_define ? _("definition") : _("undefinition"),
19420 if ((line == 0 && !at_commandline)
19421 || (line != 0 && at_commandline))
19422 complaint (&symfile_complaints,
19423 _("debug info gives %s macro %s with %s line %d: %s"),
19424 at_commandline ? _("command-line") : _("in-file"),
19425 is_define ? _("definition") : _("undefinition"),
19426 line == 0 ? _("zero") : _("non-zero"), line, body);
19429 parse_macro_definition (current_file, line, body);
19432 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
19433 || macinfo_type == DW_MACRO_GNU_undef_indirect
19434 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
19435 macro_undef (current_file, line, body);
19440 case DW_MACRO_GNU_start_file:
19442 unsigned int bytes_read;
19445 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19446 mac_ptr += bytes_read;
19447 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19448 mac_ptr += bytes_read;
19450 if ((line == 0 && !at_commandline)
19451 || (line != 0 && at_commandline))
19452 complaint (&symfile_complaints,
19453 _("debug info gives source %d included "
19454 "from %s at %s line %d"),
19455 file, at_commandline ? _("command-line") : _("file"),
19456 line == 0 ? _("zero") : _("non-zero"), line);
19458 if (at_commandline)
19460 /* This DW_MACRO_GNU_start_file was executed in the
19462 at_commandline = 0;
19465 current_file = macro_start_file (file, line,
19466 current_file, comp_dir,
19471 case DW_MACRO_GNU_end_file:
19472 if (! current_file)
19473 complaint (&symfile_complaints,
19474 _("macro debug info has an unmatched "
19475 "`close_file' directive"));
19478 current_file = current_file->included_by;
19479 if (! current_file)
19481 enum dwarf_macro_record_type next_type;
19483 /* GCC circa March 2002 doesn't produce the zero
19484 type byte marking the end of the compilation
19485 unit. Complain if it's not there, but exit no
19488 /* Do we at least have room for a macinfo type byte? */
19489 if (mac_ptr >= mac_end)
19491 dwarf2_section_buffer_overflow_complaint (section);
19495 /* We don't increment mac_ptr here, so this is just
19497 next_type = read_1_byte (abfd, mac_ptr);
19498 if (next_type != 0)
19499 complaint (&symfile_complaints,
19500 _("no terminating 0-type entry for "
19501 "macros in `.debug_macinfo' section"));
19508 case DW_MACRO_GNU_transparent_include:
19509 case DW_MACRO_GNU_transparent_include_alt:
19513 bfd *include_bfd = abfd;
19514 struct dwarf2_section_info *include_section = section;
19515 struct dwarf2_section_info alt_section;
19516 const gdb_byte *include_mac_end = mac_end;
19517 int is_dwz = section_is_dwz;
19518 const gdb_byte *new_mac_ptr;
19520 offset = read_offset_1 (abfd, mac_ptr, offset_size);
19521 mac_ptr += offset_size;
19523 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
19525 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19527 dwarf2_read_section (dwarf2_per_objfile->objfile,
19530 include_bfd = dwz->macro.asection->owner;
19531 include_section = &dwz->macro;
19532 include_mac_end = dwz->macro.buffer + dwz->macro.size;
19536 new_mac_ptr = include_section->buffer + offset;
19537 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
19541 /* This has actually happened; see
19542 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
19543 complaint (&symfile_complaints,
19544 _("recursive DW_MACRO_GNU_transparent_include in "
19545 ".debug_macro section"));
19549 *slot = (void *) new_mac_ptr;
19551 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19552 include_mac_end, current_file,
19554 section, section_is_gnu, is_dwz,
19555 offset_size, objfile, include_hash);
19557 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19562 case DW_MACINFO_vendor_ext:
19563 if (!section_is_gnu)
19565 unsigned int bytes_read;
19568 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19569 mac_ptr += bytes_read;
19570 read_direct_string (abfd, mac_ptr, &bytes_read);
19571 mac_ptr += bytes_read;
19573 /* We don't recognize any vendor extensions. */
19579 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19580 mac_ptr, mac_end, abfd, offset_size,
19582 if (mac_ptr == NULL)
19586 } while (macinfo_type != 0);
19590 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19591 const char *comp_dir, int section_is_gnu)
19593 struct objfile *objfile = dwarf2_per_objfile->objfile;
19594 struct line_header *lh = cu->line_header;
19596 const gdb_byte *mac_ptr, *mac_end;
19597 struct macro_source_file *current_file = 0;
19598 enum dwarf_macro_record_type macinfo_type;
19599 unsigned int offset_size = cu->header.offset_size;
19600 const gdb_byte *opcode_definitions[256];
19601 struct cleanup *cleanup;
19602 htab_t include_hash;
19604 struct dwarf2_section_info *section;
19605 const char *section_name;
19607 if (cu->dwo_unit != NULL)
19609 if (section_is_gnu)
19611 section = &cu->dwo_unit->dwo_file->sections.macro;
19612 section_name = ".debug_macro.dwo";
19616 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19617 section_name = ".debug_macinfo.dwo";
19622 if (section_is_gnu)
19624 section = &dwarf2_per_objfile->macro;
19625 section_name = ".debug_macro";
19629 section = &dwarf2_per_objfile->macinfo;
19630 section_name = ".debug_macinfo";
19634 dwarf2_read_section (objfile, section);
19635 if (section->buffer == NULL)
19637 complaint (&symfile_complaints, _("missing %s section"), section_name);
19640 abfd = section->asection->owner;
19642 /* First pass: Find the name of the base filename.
19643 This filename is needed in order to process all macros whose definition
19644 (or undefinition) comes from the command line. These macros are defined
19645 before the first DW_MACINFO_start_file entry, and yet still need to be
19646 associated to the base file.
19648 To determine the base file name, we scan the macro definitions until we
19649 reach the first DW_MACINFO_start_file entry. We then initialize
19650 CURRENT_FILE accordingly so that any macro definition found before the
19651 first DW_MACINFO_start_file can still be associated to the base file. */
19653 mac_ptr = section->buffer + offset;
19654 mac_end = section->buffer + section->size;
19656 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19657 &offset_size, section_is_gnu);
19658 if (mac_ptr == NULL)
19660 /* We already issued a complaint. */
19666 /* Do we at least have room for a macinfo type byte? */
19667 if (mac_ptr >= mac_end)
19669 /* Complaint is printed during the second pass as GDB will probably
19670 stop the first pass earlier upon finding
19671 DW_MACINFO_start_file. */
19675 macinfo_type = read_1_byte (abfd, mac_ptr);
19678 /* Note that we rely on the fact that the corresponding GNU and
19679 DWARF constants are the same. */
19680 switch (macinfo_type)
19682 /* A zero macinfo type indicates the end of the macro
19687 case DW_MACRO_GNU_define:
19688 case DW_MACRO_GNU_undef:
19689 /* Only skip the data by MAC_PTR. */
19691 unsigned int bytes_read;
19693 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19694 mac_ptr += bytes_read;
19695 read_direct_string (abfd, mac_ptr, &bytes_read);
19696 mac_ptr += bytes_read;
19700 case DW_MACRO_GNU_start_file:
19702 unsigned int bytes_read;
19705 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19706 mac_ptr += bytes_read;
19707 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19708 mac_ptr += bytes_read;
19710 current_file = macro_start_file (file, line, current_file,
19711 comp_dir, lh, objfile);
19715 case DW_MACRO_GNU_end_file:
19716 /* No data to skip by MAC_PTR. */
19719 case DW_MACRO_GNU_define_indirect:
19720 case DW_MACRO_GNU_undef_indirect:
19721 case DW_MACRO_GNU_define_indirect_alt:
19722 case DW_MACRO_GNU_undef_indirect_alt:
19724 unsigned int bytes_read;
19726 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19727 mac_ptr += bytes_read;
19728 mac_ptr += offset_size;
19732 case DW_MACRO_GNU_transparent_include:
19733 case DW_MACRO_GNU_transparent_include_alt:
19734 /* Note that, according to the spec, a transparent include
19735 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19736 skip this opcode. */
19737 mac_ptr += offset_size;
19740 case DW_MACINFO_vendor_ext:
19741 /* Only skip the data by MAC_PTR. */
19742 if (!section_is_gnu)
19744 unsigned int bytes_read;
19746 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19747 mac_ptr += bytes_read;
19748 read_direct_string (abfd, mac_ptr, &bytes_read);
19749 mac_ptr += bytes_read;
19754 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19755 mac_ptr, mac_end, abfd, offset_size,
19757 if (mac_ptr == NULL)
19761 } while (macinfo_type != 0 && current_file == NULL);
19763 /* Second pass: Process all entries.
19765 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19766 command-line macro definitions/undefinitions. This flag is unset when we
19767 reach the first DW_MACINFO_start_file entry. */
19769 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19770 NULL, xcalloc, xfree);
19771 cleanup = make_cleanup_htab_delete (include_hash);
19772 mac_ptr = section->buffer + offset;
19773 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19774 *slot = (void *) mac_ptr;
19775 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19776 current_file, lh, comp_dir, section,
19778 offset_size, objfile, include_hash);
19779 do_cleanups (cleanup);
19782 /* Check if the attribute's form is a DW_FORM_block*
19783 if so return true else false. */
19786 attr_form_is_block (struct attribute *attr)
19788 return (attr == NULL ? 0 :
19789 attr->form == DW_FORM_block1
19790 || attr->form == DW_FORM_block2
19791 || attr->form == DW_FORM_block4
19792 || attr->form == DW_FORM_block
19793 || attr->form == DW_FORM_exprloc);
19796 /* Return non-zero if ATTR's value is a section offset --- classes
19797 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19798 You may use DW_UNSND (attr) to retrieve such offsets.
19800 Section 7.5.4, "Attribute Encodings", explains that no attribute
19801 may have a value that belongs to more than one of these classes; it
19802 would be ambiguous if we did, because we use the same forms for all
19806 attr_form_is_section_offset (struct attribute *attr)
19808 return (attr->form == DW_FORM_data4
19809 || attr->form == DW_FORM_data8
19810 || attr->form == DW_FORM_sec_offset);
19813 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19814 zero otherwise. When this function returns true, you can apply
19815 dwarf2_get_attr_constant_value to it.
19817 However, note that for some attributes you must check
19818 attr_form_is_section_offset before using this test. DW_FORM_data4
19819 and DW_FORM_data8 are members of both the constant class, and of
19820 the classes that contain offsets into other debug sections
19821 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19822 that, if an attribute's can be either a constant or one of the
19823 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19824 taken as section offsets, not constants. */
19827 attr_form_is_constant (struct attribute *attr)
19829 switch (attr->form)
19831 case DW_FORM_sdata:
19832 case DW_FORM_udata:
19833 case DW_FORM_data1:
19834 case DW_FORM_data2:
19835 case DW_FORM_data4:
19836 case DW_FORM_data8:
19843 /* Return the .debug_loc section to use for CU.
19844 For DWO files use .debug_loc.dwo. */
19846 static struct dwarf2_section_info *
19847 cu_debug_loc_section (struct dwarf2_cu *cu)
19850 return &cu->dwo_unit->dwo_file->sections.loc;
19851 return &dwarf2_per_objfile->loc;
19854 /* A helper function that fills in a dwarf2_loclist_baton. */
19857 fill_in_loclist_baton (struct dwarf2_cu *cu,
19858 struct dwarf2_loclist_baton *baton,
19859 struct attribute *attr)
19861 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19863 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19865 baton->per_cu = cu->per_cu;
19866 gdb_assert (baton->per_cu);
19867 /* We don't know how long the location list is, but make sure we
19868 don't run off the edge of the section. */
19869 baton->size = section->size - DW_UNSND (attr);
19870 baton->data = section->buffer + DW_UNSND (attr);
19871 baton->base_address = cu->base_address;
19872 baton->from_dwo = cu->dwo_unit != NULL;
19876 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19877 struct dwarf2_cu *cu, int is_block)
19879 struct objfile *objfile = dwarf2_per_objfile->objfile;
19880 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19882 if (attr_form_is_section_offset (attr)
19883 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19884 the section. If so, fall through to the complaint in the
19886 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19888 struct dwarf2_loclist_baton *baton;
19890 baton = obstack_alloc (&objfile->objfile_obstack,
19891 sizeof (struct dwarf2_loclist_baton));
19893 fill_in_loclist_baton (cu, baton, attr);
19895 if (cu->base_known == 0)
19896 complaint (&symfile_complaints,
19897 _("Location list used without "
19898 "specifying the CU base address."));
19900 SYMBOL_ACLASS_INDEX (sym) = (is_block
19901 ? dwarf2_loclist_block_index
19902 : dwarf2_loclist_index);
19903 SYMBOL_LOCATION_BATON (sym) = baton;
19907 struct dwarf2_locexpr_baton *baton;
19909 baton = obstack_alloc (&objfile->objfile_obstack,
19910 sizeof (struct dwarf2_locexpr_baton));
19911 baton->per_cu = cu->per_cu;
19912 gdb_assert (baton->per_cu);
19914 if (attr_form_is_block (attr))
19916 /* Note that we're just copying the block's data pointer
19917 here, not the actual data. We're still pointing into the
19918 info_buffer for SYM's objfile; right now we never release
19919 that buffer, but when we do clean up properly this may
19921 baton->size = DW_BLOCK (attr)->size;
19922 baton->data = DW_BLOCK (attr)->data;
19926 dwarf2_invalid_attrib_class_complaint ("location description",
19927 SYMBOL_NATURAL_NAME (sym));
19931 SYMBOL_ACLASS_INDEX (sym) = (is_block
19932 ? dwarf2_locexpr_block_index
19933 : dwarf2_locexpr_index);
19934 SYMBOL_LOCATION_BATON (sym) = baton;
19938 /* Return the OBJFILE associated with the compilation unit CU. If CU
19939 came from a separate debuginfo file, then the master objfile is
19943 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19945 struct objfile *objfile = per_cu->objfile;
19947 /* Return the master objfile, so that we can report and look up the
19948 correct file containing this variable. */
19949 if (objfile->separate_debug_objfile_backlink)
19950 objfile = objfile->separate_debug_objfile_backlink;
19955 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19956 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19957 CU_HEADERP first. */
19959 static const struct comp_unit_head *
19960 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19961 struct dwarf2_per_cu_data *per_cu)
19963 const gdb_byte *info_ptr;
19966 return &per_cu->cu->header;
19968 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
19970 memset (cu_headerp, 0, sizeof (*cu_headerp));
19971 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
19976 /* Return the address size given in the compilation unit header for CU. */
19979 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
19981 struct comp_unit_head cu_header_local;
19982 const struct comp_unit_head *cu_headerp;
19984 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19986 return cu_headerp->addr_size;
19989 /* Return the offset size given in the compilation unit header for CU. */
19992 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
19994 struct comp_unit_head cu_header_local;
19995 const struct comp_unit_head *cu_headerp;
19997 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19999 return cu_headerp->offset_size;
20002 /* See its dwarf2loc.h declaration. */
20005 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
20007 struct comp_unit_head cu_header_local;
20008 const struct comp_unit_head *cu_headerp;
20010 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20012 if (cu_headerp->version == 2)
20013 return cu_headerp->addr_size;
20015 return cu_headerp->offset_size;
20018 /* Return the text offset of the CU. The returned offset comes from
20019 this CU's objfile. If this objfile came from a separate debuginfo
20020 file, then the offset may be different from the corresponding
20021 offset in the parent objfile. */
20024 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
20026 struct objfile *objfile = per_cu->objfile;
20028 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20031 /* Locate the .debug_info compilation unit from CU's objfile which contains
20032 the DIE at OFFSET. Raises an error on failure. */
20034 static struct dwarf2_per_cu_data *
20035 dwarf2_find_containing_comp_unit (sect_offset offset,
20036 unsigned int offset_in_dwz,
20037 struct objfile *objfile)
20039 struct dwarf2_per_cu_data *this_cu;
20041 const sect_offset *cu_off;
20044 high = dwarf2_per_objfile->n_comp_units - 1;
20047 struct dwarf2_per_cu_data *mid_cu;
20048 int mid = low + (high - low) / 2;
20050 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
20051 cu_off = &mid_cu->offset;
20052 if (mid_cu->is_dwz > offset_in_dwz
20053 || (mid_cu->is_dwz == offset_in_dwz
20054 && cu_off->sect_off >= offset.sect_off))
20059 gdb_assert (low == high);
20060 this_cu = dwarf2_per_objfile->all_comp_units[low];
20061 cu_off = &this_cu->offset;
20062 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
20064 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
20065 error (_("Dwarf Error: could not find partial DIE containing "
20066 "offset 0x%lx [in module %s]"),
20067 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
20069 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
20070 <= offset.sect_off);
20071 return dwarf2_per_objfile->all_comp_units[low-1];
20075 this_cu = dwarf2_per_objfile->all_comp_units[low];
20076 if (low == dwarf2_per_objfile->n_comp_units - 1
20077 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
20078 error (_("invalid dwarf2 offset %u"), offset.sect_off);
20079 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
20084 /* Initialize dwarf2_cu CU, owned by PER_CU. */
20087 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
20089 memset (cu, 0, sizeof (*cu));
20091 cu->per_cu = per_cu;
20092 cu->objfile = per_cu->objfile;
20093 obstack_init (&cu->comp_unit_obstack);
20096 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
20099 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
20100 enum language pretend_language)
20102 struct attribute *attr;
20104 /* Set the language we're debugging. */
20105 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
20107 set_cu_language (DW_UNSND (attr), cu);
20110 cu->language = pretend_language;
20111 cu->language_defn = language_def (cu->language);
20114 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
20116 cu->producer = DW_STRING (attr);
20119 /* Release one cached compilation unit, CU. We unlink it from the tree
20120 of compilation units, but we don't remove it from the read_in_chain;
20121 the caller is responsible for that.
20122 NOTE: DATA is a void * because this function is also used as a
20123 cleanup routine. */
20126 free_heap_comp_unit (void *data)
20128 struct dwarf2_cu *cu = data;
20130 gdb_assert (cu->per_cu != NULL);
20131 cu->per_cu->cu = NULL;
20134 obstack_free (&cu->comp_unit_obstack, NULL);
20139 /* This cleanup function is passed the address of a dwarf2_cu on the stack
20140 when we're finished with it. We can't free the pointer itself, but be
20141 sure to unlink it from the cache. Also release any associated storage. */
20144 free_stack_comp_unit (void *data)
20146 struct dwarf2_cu *cu = data;
20148 gdb_assert (cu->per_cu != NULL);
20149 cu->per_cu->cu = NULL;
20152 obstack_free (&cu->comp_unit_obstack, NULL);
20153 cu->partial_dies = NULL;
20156 /* Free all cached compilation units. */
20159 free_cached_comp_units (void *data)
20161 struct dwarf2_per_cu_data *per_cu, **last_chain;
20163 per_cu = dwarf2_per_objfile->read_in_chain;
20164 last_chain = &dwarf2_per_objfile->read_in_chain;
20165 while (per_cu != NULL)
20167 struct dwarf2_per_cu_data *next_cu;
20169 next_cu = per_cu->cu->read_in_chain;
20171 free_heap_comp_unit (per_cu->cu);
20172 *last_chain = next_cu;
20178 /* Increase the age counter on each cached compilation unit, and free
20179 any that are too old. */
20182 age_cached_comp_units (void)
20184 struct dwarf2_per_cu_data *per_cu, **last_chain;
20186 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
20187 per_cu = dwarf2_per_objfile->read_in_chain;
20188 while (per_cu != NULL)
20190 per_cu->cu->last_used ++;
20191 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
20192 dwarf2_mark (per_cu->cu);
20193 per_cu = per_cu->cu->read_in_chain;
20196 per_cu = dwarf2_per_objfile->read_in_chain;
20197 last_chain = &dwarf2_per_objfile->read_in_chain;
20198 while (per_cu != NULL)
20200 struct dwarf2_per_cu_data *next_cu;
20202 next_cu = per_cu->cu->read_in_chain;
20204 if (!per_cu->cu->mark)
20206 free_heap_comp_unit (per_cu->cu);
20207 *last_chain = next_cu;
20210 last_chain = &per_cu->cu->read_in_chain;
20216 /* Remove a single compilation unit from the cache. */
20219 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
20221 struct dwarf2_per_cu_data *per_cu, **last_chain;
20223 per_cu = dwarf2_per_objfile->read_in_chain;
20224 last_chain = &dwarf2_per_objfile->read_in_chain;
20225 while (per_cu != NULL)
20227 struct dwarf2_per_cu_data *next_cu;
20229 next_cu = per_cu->cu->read_in_chain;
20231 if (per_cu == target_per_cu)
20233 free_heap_comp_unit (per_cu->cu);
20235 *last_chain = next_cu;
20239 last_chain = &per_cu->cu->read_in_chain;
20245 /* Release all extra memory associated with OBJFILE. */
20248 dwarf2_free_objfile (struct objfile *objfile)
20250 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20252 if (dwarf2_per_objfile == NULL)
20255 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
20256 free_cached_comp_units (NULL);
20258 if (dwarf2_per_objfile->quick_file_names_table)
20259 htab_delete (dwarf2_per_objfile->quick_file_names_table);
20261 /* Everything else should be on the objfile obstack. */
20264 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
20265 We store these in a hash table separate from the DIEs, and preserve them
20266 when the DIEs are flushed out of cache.
20268 The CU "per_cu" pointer is needed because offset alone is not enough to
20269 uniquely identify the type. A file may have multiple .debug_types sections,
20270 or the type may come from a DWO file. Furthermore, while it's more logical
20271 to use per_cu->section+offset, with Fission the section with the data is in
20272 the DWO file but we don't know that section at the point we need it.
20273 We have to use something in dwarf2_per_cu_data (or the pointer to it)
20274 because we can enter the lookup routine, get_die_type_at_offset, from
20275 outside this file, and thus won't necessarily have PER_CU->cu.
20276 Fortunately, PER_CU is stable for the life of the objfile. */
20278 struct dwarf2_per_cu_offset_and_type
20280 const struct dwarf2_per_cu_data *per_cu;
20281 sect_offset offset;
20285 /* Hash function for a dwarf2_per_cu_offset_and_type. */
20288 per_cu_offset_and_type_hash (const void *item)
20290 const struct dwarf2_per_cu_offset_and_type *ofs = item;
20292 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
20295 /* Equality function for a dwarf2_per_cu_offset_and_type. */
20298 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
20300 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
20301 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
20303 return (ofs_lhs->per_cu == ofs_rhs->per_cu
20304 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
20307 /* Set the type associated with DIE to TYPE. Save it in CU's hash
20308 table if necessary. For convenience, return TYPE.
20310 The DIEs reading must have careful ordering to:
20311 * Not cause infite loops trying to read in DIEs as a prerequisite for
20312 reading current DIE.
20313 * Not trying to dereference contents of still incompletely read in types
20314 while reading in other DIEs.
20315 * Enable referencing still incompletely read in types just by a pointer to
20316 the type without accessing its fields.
20318 Therefore caller should follow these rules:
20319 * Try to fetch any prerequisite types we may need to build this DIE type
20320 before building the type and calling set_die_type.
20321 * After building type call set_die_type for current DIE as soon as
20322 possible before fetching more types to complete the current type.
20323 * Make the type as complete as possible before fetching more types. */
20325 static struct type *
20326 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20328 struct dwarf2_per_cu_offset_and_type **slot, ofs;
20329 struct objfile *objfile = cu->objfile;
20331 /* For Ada types, make sure that the gnat-specific data is always
20332 initialized (if not already set). There are a few types where
20333 we should not be doing so, because the type-specific area is
20334 already used to hold some other piece of info (eg: TYPE_CODE_FLT
20335 where the type-specific area is used to store the floatformat).
20336 But this is not a problem, because the gnat-specific information
20337 is actually not needed for these types. */
20338 if (need_gnat_info (cu)
20339 && TYPE_CODE (type) != TYPE_CODE_FUNC
20340 && TYPE_CODE (type) != TYPE_CODE_FLT
20341 && !HAVE_GNAT_AUX_INFO (type))
20342 INIT_GNAT_SPECIFIC (type);
20344 if (dwarf2_per_objfile->die_type_hash == NULL)
20346 dwarf2_per_objfile->die_type_hash =
20347 htab_create_alloc_ex (127,
20348 per_cu_offset_and_type_hash,
20349 per_cu_offset_and_type_eq,
20351 &objfile->objfile_obstack,
20352 hashtab_obstack_allocate,
20353 dummy_obstack_deallocate);
20356 ofs.per_cu = cu->per_cu;
20357 ofs.offset = die->offset;
20359 slot = (struct dwarf2_per_cu_offset_and_type **)
20360 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
20362 complaint (&symfile_complaints,
20363 _("A problem internal to GDB: DIE 0x%x has type already set"),
20364 die->offset.sect_off);
20365 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
20370 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
20371 or return NULL if the die does not have a saved type. */
20373 static struct type *
20374 get_die_type_at_offset (sect_offset offset,
20375 struct dwarf2_per_cu_data *per_cu)
20377 struct dwarf2_per_cu_offset_and_type *slot, ofs;
20379 if (dwarf2_per_objfile->die_type_hash == NULL)
20382 ofs.per_cu = per_cu;
20383 ofs.offset = offset;
20384 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
20391 /* Look up the type for DIE in CU in die_type_hash,
20392 or return NULL if DIE does not have a saved type. */
20394 static struct type *
20395 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
20397 return get_die_type_at_offset (die->offset, cu->per_cu);
20400 /* Add a dependence relationship from CU to REF_PER_CU. */
20403 dwarf2_add_dependence (struct dwarf2_cu *cu,
20404 struct dwarf2_per_cu_data *ref_per_cu)
20408 if (cu->dependencies == NULL)
20410 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
20411 NULL, &cu->comp_unit_obstack,
20412 hashtab_obstack_allocate,
20413 dummy_obstack_deallocate);
20415 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
20417 *slot = ref_per_cu;
20420 /* Subroutine of dwarf2_mark to pass to htab_traverse.
20421 Set the mark field in every compilation unit in the
20422 cache that we must keep because we are keeping CU. */
20425 dwarf2_mark_helper (void **slot, void *data)
20427 struct dwarf2_per_cu_data *per_cu;
20429 per_cu = (struct dwarf2_per_cu_data *) *slot;
20431 /* cu->dependencies references may not yet have been ever read if QUIT aborts
20432 reading of the chain. As such dependencies remain valid it is not much
20433 useful to track and undo them during QUIT cleanups. */
20434 if (per_cu->cu == NULL)
20437 if (per_cu->cu->mark)
20439 per_cu->cu->mark = 1;
20441 if (per_cu->cu->dependencies != NULL)
20442 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
20447 /* Set the mark field in CU and in every other compilation unit in the
20448 cache that we must keep because we are keeping CU. */
20451 dwarf2_mark (struct dwarf2_cu *cu)
20456 if (cu->dependencies != NULL)
20457 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
20461 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
20465 per_cu->cu->mark = 0;
20466 per_cu = per_cu->cu->read_in_chain;
20470 /* Trivial hash function for partial_die_info: the hash value of a DIE
20471 is its offset in .debug_info for this objfile. */
20474 partial_die_hash (const void *item)
20476 const struct partial_die_info *part_die = item;
20478 return part_die->offset.sect_off;
20481 /* Trivial comparison function for partial_die_info structures: two DIEs
20482 are equal if they have the same offset. */
20485 partial_die_eq (const void *item_lhs, const void *item_rhs)
20487 const struct partial_die_info *part_die_lhs = item_lhs;
20488 const struct partial_die_info *part_die_rhs = item_rhs;
20490 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
20493 static struct cmd_list_element *set_dwarf2_cmdlist;
20494 static struct cmd_list_element *show_dwarf2_cmdlist;
20497 set_dwarf2_cmd (char *args, int from_tty)
20499 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
20503 show_dwarf2_cmd (char *args, int from_tty)
20505 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
20508 /* Free data associated with OBJFILE, if necessary. */
20511 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
20513 struct dwarf2_per_objfile *data = d;
20516 for (ix = 0; ix < data->n_comp_units; ++ix)
20517 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
20519 for (ix = 0; ix < data->n_type_units; ++ix)
20520 VEC_free (dwarf2_per_cu_ptr,
20521 data->all_type_units[ix]->per_cu.imported_symtabs);
20522 xfree (data->all_type_units);
20524 VEC_free (dwarf2_section_info_def, data->types);
20526 if (data->dwo_files)
20527 free_dwo_files (data->dwo_files, objfile);
20528 if (data->dwp_file)
20529 gdb_bfd_unref (data->dwp_file->dbfd);
20531 if (data->dwz_file && data->dwz_file->dwz_bfd)
20532 gdb_bfd_unref (data->dwz_file->dwz_bfd);
20536 /* The "save gdb-index" command. */
20538 /* The contents of the hash table we create when building the string
20540 struct strtab_entry
20542 offset_type offset;
20546 /* Hash function for a strtab_entry.
20548 Function is used only during write_hash_table so no index format backward
20549 compatibility is needed. */
20552 hash_strtab_entry (const void *e)
20554 const struct strtab_entry *entry = e;
20555 return mapped_index_string_hash (INT_MAX, entry->str);
20558 /* Equality function for a strtab_entry. */
20561 eq_strtab_entry (const void *a, const void *b)
20563 const struct strtab_entry *ea = a;
20564 const struct strtab_entry *eb = b;
20565 return !strcmp (ea->str, eb->str);
20568 /* Create a strtab_entry hash table. */
20571 create_strtab (void)
20573 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
20574 xfree, xcalloc, xfree);
20577 /* Add a string to the constant pool. Return the string's offset in
20581 add_string (htab_t table, struct obstack *cpool, const char *str)
20584 struct strtab_entry entry;
20585 struct strtab_entry *result;
20588 slot = htab_find_slot (table, &entry, INSERT);
20593 result = XNEW (struct strtab_entry);
20594 result->offset = obstack_object_size (cpool);
20596 obstack_grow_str0 (cpool, str);
20599 return result->offset;
20602 /* An entry in the symbol table. */
20603 struct symtab_index_entry
20605 /* The name of the symbol. */
20607 /* The offset of the name in the constant pool. */
20608 offset_type index_offset;
20609 /* A sorted vector of the indices of all the CUs that hold an object
20611 VEC (offset_type) *cu_indices;
20614 /* The symbol table. This is a power-of-2-sized hash table. */
20615 struct mapped_symtab
20617 offset_type n_elements;
20619 struct symtab_index_entry **data;
20622 /* Hash function for a symtab_index_entry. */
20625 hash_symtab_entry (const void *e)
20627 const struct symtab_index_entry *entry = e;
20628 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
20629 sizeof (offset_type) * VEC_length (offset_type,
20630 entry->cu_indices),
20634 /* Equality function for a symtab_index_entry. */
20637 eq_symtab_entry (const void *a, const void *b)
20639 const struct symtab_index_entry *ea = a;
20640 const struct symtab_index_entry *eb = b;
20641 int len = VEC_length (offset_type, ea->cu_indices);
20642 if (len != VEC_length (offset_type, eb->cu_indices))
20644 return !memcmp (VEC_address (offset_type, ea->cu_indices),
20645 VEC_address (offset_type, eb->cu_indices),
20646 sizeof (offset_type) * len);
20649 /* Destroy a symtab_index_entry. */
20652 delete_symtab_entry (void *p)
20654 struct symtab_index_entry *entry = p;
20655 VEC_free (offset_type, entry->cu_indices);
20659 /* Create a hash table holding symtab_index_entry objects. */
20662 create_symbol_hash_table (void)
20664 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
20665 delete_symtab_entry, xcalloc, xfree);
20668 /* Create a new mapped symtab object. */
20670 static struct mapped_symtab *
20671 create_mapped_symtab (void)
20673 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20674 symtab->n_elements = 0;
20675 symtab->size = 1024;
20676 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20680 /* Destroy a mapped_symtab. */
20683 cleanup_mapped_symtab (void *p)
20685 struct mapped_symtab *symtab = p;
20686 /* The contents of the array are freed when the other hash table is
20688 xfree (symtab->data);
20692 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20695 Function is used only during write_hash_table so no index format backward
20696 compatibility is needed. */
20698 static struct symtab_index_entry **
20699 find_slot (struct mapped_symtab *symtab, const char *name)
20701 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20703 index = hash & (symtab->size - 1);
20704 step = ((hash * 17) & (symtab->size - 1)) | 1;
20708 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20709 return &symtab->data[index];
20710 index = (index + step) & (symtab->size - 1);
20714 /* Expand SYMTAB's hash table. */
20717 hash_expand (struct mapped_symtab *symtab)
20719 offset_type old_size = symtab->size;
20721 struct symtab_index_entry **old_entries = symtab->data;
20724 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20726 for (i = 0; i < old_size; ++i)
20728 if (old_entries[i])
20730 struct symtab_index_entry **slot = find_slot (symtab,
20731 old_entries[i]->name);
20732 *slot = old_entries[i];
20736 xfree (old_entries);
20739 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20740 CU_INDEX is the index of the CU in which the symbol appears.
20741 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20744 add_index_entry (struct mapped_symtab *symtab, const char *name,
20745 int is_static, gdb_index_symbol_kind kind,
20746 offset_type cu_index)
20748 struct symtab_index_entry **slot;
20749 offset_type cu_index_and_attrs;
20751 ++symtab->n_elements;
20752 if (4 * symtab->n_elements / 3 >= symtab->size)
20753 hash_expand (symtab);
20755 slot = find_slot (symtab, name);
20758 *slot = XNEW (struct symtab_index_entry);
20759 (*slot)->name = name;
20760 /* index_offset is set later. */
20761 (*slot)->cu_indices = NULL;
20764 cu_index_and_attrs = 0;
20765 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20766 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20767 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20769 /* We don't want to record an index value twice as we want to avoid the
20771 We process all global symbols and then all static symbols
20772 (which would allow us to avoid the duplication by only having to check
20773 the last entry pushed), but a symbol could have multiple kinds in one CU.
20774 To keep things simple we don't worry about the duplication here and
20775 sort and uniqufy the list after we've processed all symbols. */
20776 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20779 /* qsort helper routine for uniquify_cu_indices. */
20782 offset_type_compare (const void *ap, const void *bp)
20784 offset_type a = *(offset_type *) ap;
20785 offset_type b = *(offset_type *) bp;
20787 return (a > b) - (b > a);
20790 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20793 uniquify_cu_indices (struct mapped_symtab *symtab)
20797 for (i = 0; i < symtab->size; ++i)
20799 struct symtab_index_entry *entry = symtab->data[i];
20802 && entry->cu_indices != NULL)
20804 unsigned int next_to_insert, next_to_check;
20805 offset_type last_value;
20807 qsort (VEC_address (offset_type, entry->cu_indices),
20808 VEC_length (offset_type, entry->cu_indices),
20809 sizeof (offset_type), offset_type_compare);
20811 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20812 next_to_insert = 1;
20813 for (next_to_check = 1;
20814 next_to_check < VEC_length (offset_type, entry->cu_indices);
20817 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20820 last_value = VEC_index (offset_type, entry->cu_indices,
20822 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20827 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20832 /* Add a vector of indices to the constant pool. */
20835 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20836 struct symtab_index_entry *entry)
20840 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20843 offset_type len = VEC_length (offset_type, entry->cu_indices);
20844 offset_type val = MAYBE_SWAP (len);
20849 entry->index_offset = obstack_object_size (cpool);
20851 obstack_grow (cpool, &val, sizeof (val));
20853 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20856 val = MAYBE_SWAP (iter);
20857 obstack_grow (cpool, &val, sizeof (val));
20862 struct symtab_index_entry *old_entry = *slot;
20863 entry->index_offset = old_entry->index_offset;
20866 return entry->index_offset;
20869 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20870 constant pool entries going into the obstack CPOOL. */
20873 write_hash_table (struct mapped_symtab *symtab,
20874 struct obstack *output, struct obstack *cpool)
20877 htab_t symbol_hash_table;
20880 symbol_hash_table = create_symbol_hash_table ();
20881 str_table = create_strtab ();
20883 /* We add all the index vectors to the constant pool first, to
20884 ensure alignment is ok. */
20885 for (i = 0; i < symtab->size; ++i)
20887 if (symtab->data[i])
20888 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20891 /* Now write out the hash table. */
20892 for (i = 0; i < symtab->size; ++i)
20894 offset_type str_off, vec_off;
20896 if (symtab->data[i])
20898 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20899 vec_off = symtab->data[i]->index_offset;
20903 /* While 0 is a valid constant pool index, it is not valid
20904 to have 0 for both offsets. */
20909 str_off = MAYBE_SWAP (str_off);
20910 vec_off = MAYBE_SWAP (vec_off);
20912 obstack_grow (output, &str_off, sizeof (str_off));
20913 obstack_grow (output, &vec_off, sizeof (vec_off));
20916 htab_delete (str_table);
20917 htab_delete (symbol_hash_table);
20920 /* Struct to map psymtab to CU index in the index file. */
20921 struct psymtab_cu_index_map
20923 struct partial_symtab *psymtab;
20924 unsigned int cu_index;
20928 hash_psymtab_cu_index (const void *item)
20930 const struct psymtab_cu_index_map *map = item;
20932 return htab_hash_pointer (map->psymtab);
20936 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
20938 const struct psymtab_cu_index_map *lhs = item_lhs;
20939 const struct psymtab_cu_index_map *rhs = item_rhs;
20941 return lhs->psymtab == rhs->psymtab;
20944 /* Helper struct for building the address table. */
20945 struct addrmap_index_data
20947 struct objfile *objfile;
20948 struct obstack *addr_obstack;
20949 htab_t cu_index_htab;
20951 /* Non-zero if the previous_* fields are valid.
20952 We can't write an entry until we see the next entry (since it is only then
20953 that we know the end of the entry). */
20954 int previous_valid;
20955 /* Index of the CU in the table of all CUs in the index file. */
20956 unsigned int previous_cu_index;
20957 /* Start address of the CU. */
20958 CORE_ADDR previous_cu_start;
20961 /* Write an address entry to OBSTACK. */
20964 add_address_entry (struct objfile *objfile, struct obstack *obstack,
20965 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
20967 offset_type cu_index_to_write;
20969 CORE_ADDR baseaddr;
20971 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20973 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
20974 obstack_grow (obstack, addr, 8);
20975 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
20976 obstack_grow (obstack, addr, 8);
20977 cu_index_to_write = MAYBE_SWAP (cu_index);
20978 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
20981 /* Worker function for traversing an addrmap to build the address table. */
20984 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
20986 struct addrmap_index_data *data = datap;
20987 struct partial_symtab *pst = obj;
20989 if (data->previous_valid)
20990 add_address_entry (data->objfile, data->addr_obstack,
20991 data->previous_cu_start, start_addr,
20992 data->previous_cu_index);
20994 data->previous_cu_start = start_addr;
20997 struct psymtab_cu_index_map find_map, *map;
20998 find_map.psymtab = pst;
20999 map = htab_find (data->cu_index_htab, &find_map);
21000 gdb_assert (map != NULL);
21001 data->previous_cu_index = map->cu_index;
21002 data->previous_valid = 1;
21005 data->previous_valid = 0;
21010 /* Write OBJFILE's address map to OBSTACK.
21011 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
21012 in the index file. */
21015 write_address_map (struct objfile *objfile, struct obstack *obstack,
21016 htab_t cu_index_htab)
21018 struct addrmap_index_data addrmap_index_data;
21020 /* When writing the address table, we have to cope with the fact that
21021 the addrmap iterator only provides the start of a region; we have to
21022 wait until the next invocation to get the start of the next region. */
21024 addrmap_index_data.objfile = objfile;
21025 addrmap_index_data.addr_obstack = obstack;
21026 addrmap_index_data.cu_index_htab = cu_index_htab;
21027 addrmap_index_data.previous_valid = 0;
21029 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
21030 &addrmap_index_data);
21032 /* It's highly unlikely the last entry (end address = 0xff...ff)
21033 is valid, but we should still handle it.
21034 The end address is recorded as the start of the next region, but that
21035 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
21037 if (addrmap_index_data.previous_valid)
21038 add_address_entry (objfile, obstack,
21039 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
21040 addrmap_index_data.previous_cu_index);
21043 /* Return the symbol kind of PSYM. */
21045 static gdb_index_symbol_kind
21046 symbol_kind (struct partial_symbol *psym)
21048 domain_enum domain = PSYMBOL_DOMAIN (psym);
21049 enum address_class aclass = PSYMBOL_CLASS (psym);
21057 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
21059 return GDB_INDEX_SYMBOL_KIND_TYPE;
21061 case LOC_CONST_BYTES:
21062 case LOC_OPTIMIZED_OUT:
21064 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21066 /* Note: It's currently impossible to recognize psyms as enum values
21067 short of reading the type info. For now punt. */
21068 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21070 /* There are other LOC_FOO values that one might want to classify
21071 as variables, but dwarf2read.c doesn't currently use them. */
21072 return GDB_INDEX_SYMBOL_KIND_OTHER;
21074 case STRUCT_DOMAIN:
21075 return GDB_INDEX_SYMBOL_KIND_TYPE;
21077 return GDB_INDEX_SYMBOL_KIND_OTHER;
21081 /* Add a list of partial symbols to SYMTAB. */
21084 write_psymbols (struct mapped_symtab *symtab,
21086 struct partial_symbol **psymp,
21088 offset_type cu_index,
21091 for (; count-- > 0; ++psymp)
21093 struct partial_symbol *psym = *psymp;
21096 if (SYMBOL_LANGUAGE (psym) == language_ada)
21097 error (_("Ada is not currently supported by the index"));
21099 /* Only add a given psymbol once. */
21100 slot = htab_find_slot (psyms_seen, psym, INSERT);
21103 gdb_index_symbol_kind kind = symbol_kind (psym);
21106 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
21107 is_static, kind, cu_index);
21112 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
21113 exception if there is an error. */
21116 write_obstack (FILE *file, struct obstack *obstack)
21118 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
21120 != obstack_object_size (obstack))
21121 error (_("couldn't data write to file"));
21124 /* Unlink a file if the argument is not NULL. */
21127 unlink_if_set (void *p)
21129 char **filename = p;
21131 unlink (*filename);
21134 /* A helper struct used when iterating over debug_types. */
21135 struct signatured_type_index_data
21137 struct objfile *objfile;
21138 struct mapped_symtab *symtab;
21139 struct obstack *types_list;
21144 /* A helper function that writes a single signatured_type to an
21148 write_one_signatured_type (void **slot, void *d)
21150 struct signatured_type_index_data *info = d;
21151 struct signatured_type *entry = (struct signatured_type *) *slot;
21152 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
21155 write_psymbols (info->symtab,
21157 info->objfile->global_psymbols.list
21158 + psymtab->globals_offset,
21159 psymtab->n_global_syms, info->cu_index,
21161 write_psymbols (info->symtab,
21163 info->objfile->static_psymbols.list
21164 + psymtab->statics_offset,
21165 psymtab->n_static_syms, info->cu_index,
21168 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21169 entry->per_cu.offset.sect_off);
21170 obstack_grow (info->types_list, val, 8);
21171 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21172 entry->type_offset_in_tu.cu_off);
21173 obstack_grow (info->types_list, val, 8);
21174 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
21175 obstack_grow (info->types_list, val, 8);
21182 /* Recurse into all "included" dependencies and write their symbols as
21183 if they appeared in this psymtab. */
21186 recursively_write_psymbols (struct objfile *objfile,
21187 struct partial_symtab *psymtab,
21188 struct mapped_symtab *symtab,
21190 offset_type cu_index)
21194 for (i = 0; i < psymtab->number_of_dependencies; ++i)
21195 if (psymtab->dependencies[i]->user != NULL)
21196 recursively_write_psymbols (objfile, psymtab->dependencies[i],
21197 symtab, psyms_seen, cu_index);
21199 write_psymbols (symtab,
21201 objfile->global_psymbols.list + psymtab->globals_offset,
21202 psymtab->n_global_syms, cu_index,
21204 write_psymbols (symtab,
21206 objfile->static_psymbols.list + psymtab->statics_offset,
21207 psymtab->n_static_syms, cu_index,
21211 /* Create an index file for OBJFILE in the directory DIR. */
21214 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
21216 struct cleanup *cleanup;
21217 char *filename, *cleanup_filename;
21218 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
21219 struct obstack cu_list, types_cu_list;
21222 struct mapped_symtab *symtab;
21223 offset_type val, size_of_contents, total_len;
21226 htab_t cu_index_htab;
21227 struct psymtab_cu_index_map *psymtab_cu_index_map;
21229 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
21232 if (dwarf2_per_objfile->using_index)
21233 error (_("Cannot use an index to create the index"));
21235 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
21236 error (_("Cannot make an index when the file has multiple .debug_types sections"));
21238 if (stat (objfile->name, &st) < 0)
21239 perror_with_name (objfile->name);
21241 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
21242 INDEX_SUFFIX, (char *) NULL);
21243 cleanup = make_cleanup (xfree, filename);
21245 out_file = gdb_fopen_cloexec (filename, "wb");
21247 error (_("Can't open `%s' for writing"), filename);
21249 cleanup_filename = filename;
21250 make_cleanup (unlink_if_set, &cleanup_filename);
21252 symtab = create_mapped_symtab ();
21253 make_cleanup (cleanup_mapped_symtab, symtab);
21255 obstack_init (&addr_obstack);
21256 make_cleanup_obstack_free (&addr_obstack);
21258 obstack_init (&cu_list);
21259 make_cleanup_obstack_free (&cu_list);
21261 obstack_init (&types_cu_list);
21262 make_cleanup_obstack_free (&types_cu_list);
21264 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
21265 NULL, xcalloc, xfree);
21266 make_cleanup_htab_delete (psyms_seen);
21268 /* While we're scanning CU's create a table that maps a psymtab pointer
21269 (which is what addrmap records) to its index (which is what is recorded
21270 in the index file). This will later be needed to write the address
21272 cu_index_htab = htab_create_alloc (100,
21273 hash_psymtab_cu_index,
21274 eq_psymtab_cu_index,
21275 NULL, xcalloc, xfree);
21276 make_cleanup_htab_delete (cu_index_htab);
21277 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
21278 xmalloc (sizeof (struct psymtab_cu_index_map)
21279 * dwarf2_per_objfile->n_comp_units);
21280 make_cleanup (xfree, psymtab_cu_index_map);
21282 /* The CU list is already sorted, so we don't need to do additional
21283 work here. Also, the debug_types entries do not appear in
21284 all_comp_units, but only in their own hash table. */
21285 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
21287 struct dwarf2_per_cu_data *per_cu
21288 = dwarf2_per_objfile->all_comp_units[i];
21289 struct partial_symtab *psymtab = per_cu->v.psymtab;
21291 struct psymtab_cu_index_map *map;
21294 /* CU of a shared file from 'dwz -m' may be unused by this main file.
21295 It may be referenced from a local scope but in such case it does not
21296 need to be present in .gdb_index. */
21297 if (psymtab == NULL)
21300 if (psymtab->user == NULL)
21301 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
21303 map = &psymtab_cu_index_map[i];
21304 map->psymtab = psymtab;
21306 slot = htab_find_slot (cu_index_htab, map, INSERT);
21307 gdb_assert (slot != NULL);
21308 gdb_assert (*slot == NULL);
21311 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21312 per_cu->offset.sect_off);
21313 obstack_grow (&cu_list, val, 8);
21314 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
21315 obstack_grow (&cu_list, val, 8);
21318 /* Dump the address map. */
21319 write_address_map (objfile, &addr_obstack, cu_index_htab);
21321 /* Write out the .debug_type entries, if any. */
21322 if (dwarf2_per_objfile->signatured_types)
21324 struct signatured_type_index_data sig_data;
21326 sig_data.objfile = objfile;
21327 sig_data.symtab = symtab;
21328 sig_data.types_list = &types_cu_list;
21329 sig_data.psyms_seen = psyms_seen;
21330 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
21331 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
21332 write_one_signatured_type, &sig_data);
21335 /* Now that we've processed all symbols we can shrink their cu_indices
21337 uniquify_cu_indices (symtab);
21339 obstack_init (&constant_pool);
21340 make_cleanup_obstack_free (&constant_pool);
21341 obstack_init (&symtab_obstack);
21342 make_cleanup_obstack_free (&symtab_obstack);
21343 write_hash_table (symtab, &symtab_obstack, &constant_pool);
21345 obstack_init (&contents);
21346 make_cleanup_obstack_free (&contents);
21347 size_of_contents = 6 * sizeof (offset_type);
21348 total_len = size_of_contents;
21350 /* The version number. */
21351 val = MAYBE_SWAP (8);
21352 obstack_grow (&contents, &val, sizeof (val));
21354 /* The offset of the CU list from the start of the file. */
21355 val = MAYBE_SWAP (total_len);
21356 obstack_grow (&contents, &val, sizeof (val));
21357 total_len += obstack_object_size (&cu_list);
21359 /* The offset of the types CU list from the start of the file. */
21360 val = MAYBE_SWAP (total_len);
21361 obstack_grow (&contents, &val, sizeof (val));
21362 total_len += obstack_object_size (&types_cu_list);
21364 /* The offset of the address table from the start of the file. */
21365 val = MAYBE_SWAP (total_len);
21366 obstack_grow (&contents, &val, sizeof (val));
21367 total_len += obstack_object_size (&addr_obstack);
21369 /* The offset of the symbol table from the start of the file. */
21370 val = MAYBE_SWAP (total_len);
21371 obstack_grow (&contents, &val, sizeof (val));
21372 total_len += obstack_object_size (&symtab_obstack);
21374 /* The offset of the constant pool from the start of the file. */
21375 val = MAYBE_SWAP (total_len);
21376 obstack_grow (&contents, &val, sizeof (val));
21377 total_len += obstack_object_size (&constant_pool);
21379 gdb_assert (obstack_object_size (&contents) == size_of_contents);
21381 write_obstack (out_file, &contents);
21382 write_obstack (out_file, &cu_list);
21383 write_obstack (out_file, &types_cu_list);
21384 write_obstack (out_file, &addr_obstack);
21385 write_obstack (out_file, &symtab_obstack);
21386 write_obstack (out_file, &constant_pool);
21390 /* We want to keep the file, so we set cleanup_filename to NULL
21391 here. See unlink_if_set. */
21392 cleanup_filename = NULL;
21394 do_cleanups (cleanup);
21397 /* Implementation of the `save gdb-index' command.
21399 Note that the file format used by this command is documented in the
21400 GDB manual. Any changes here must be documented there. */
21403 save_gdb_index_command (char *arg, int from_tty)
21405 struct objfile *objfile;
21408 error (_("usage: save gdb-index DIRECTORY"));
21410 ALL_OBJFILES (objfile)
21414 /* If the objfile does not correspond to an actual file, skip it. */
21415 if (stat (objfile->name, &st) < 0)
21418 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21419 if (dwarf2_per_objfile)
21421 volatile struct gdb_exception except;
21423 TRY_CATCH (except, RETURN_MASK_ERROR)
21425 write_psymtabs_to_index (objfile, arg);
21427 if (except.reason < 0)
21428 exception_fprintf (gdb_stderr, except,
21429 _("Error while writing index for `%s': "),
21437 int dwarf2_always_disassemble;
21440 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
21441 struct cmd_list_element *c, const char *value)
21443 fprintf_filtered (file,
21444 _("Whether to always disassemble "
21445 "DWARF expressions is %s.\n"),
21450 show_check_physname (struct ui_file *file, int from_tty,
21451 struct cmd_list_element *c, const char *value)
21453 fprintf_filtered (file,
21454 _("Whether to check \"physname\" is %s.\n"),
21458 void _initialize_dwarf2_read (void);
21461 _initialize_dwarf2_read (void)
21463 struct cmd_list_element *c;
21465 dwarf2_objfile_data_key
21466 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
21468 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
21469 Set DWARF 2 specific variables.\n\
21470 Configure DWARF 2 variables such as the cache size"),
21471 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
21472 0/*allow-unknown*/, &maintenance_set_cmdlist);
21474 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
21475 Show DWARF 2 specific variables\n\
21476 Show DWARF 2 variables such as the cache size"),
21477 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
21478 0/*allow-unknown*/, &maintenance_show_cmdlist);
21480 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
21481 &dwarf2_max_cache_age, _("\
21482 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
21483 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
21484 A higher limit means that cached compilation units will be stored\n\
21485 in memory longer, and more total memory will be used. Zero disables\n\
21486 caching, which can slow down startup."),
21488 show_dwarf2_max_cache_age,
21489 &set_dwarf2_cmdlist,
21490 &show_dwarf2_cmdlist);
21492 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
21493 &dwarf2_always_disassemble, _("\
21494 Set whether `info address' always disassembles DWARF expressions."), _("\
21495 Show whether `info address' always disassembles DWARF expressions."), _("\
21496 When enabled, DWARF expressions are always printed in an assembly-like\n\
21497 syntax. When disabled, expressions will be printed in a more\n\
21498 conversational style, when possible."),
21500 show_dwarf2_always_disassemble,
21501 &set_dwarf2_cmdlist,
21502 &show_dwarf2_cmdlist);
21504 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
21505 Set debugging of the dwarf2 reader."), _("\
21506 Show debugging of the dwarf2 reader."), _("\
21507 When enabled, debugging messages are printed during dwarf2 reading\n\
21508 and symtab expansion."),
21511 &setdebuglist, &showdebuglist);
21513 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
21514 Set debugging of the dwarf2 DIE reader."), _("\
21515 Show debugging of the dwarf2 DIE reader."), _("\
21516 When enabled (non-zero), DIEs are dumped after they are read in.\n\
21517 The value is the maximum depth to print."),
21520 &setdebuglist, &showdebuglist);
21522 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
21523 Set cross-checking of \"physname\" code against demangler."), _("\
21524 Show cross-checking of \"physname\" code against demangler."), _("\
21525 When enabled, GDB's internal \"physname\" code is checked against\n\
21527 NULL, show_check_physname,
21528 &setdebuglist, &showdebuglist);
21530 add_setshow_boolean_cmd ("use-deprecated-index-sections",
21531 no_class, &use_deprecated_index_sections, _("\
21532 Set whether to use deprecated gdb_index sections."), _("\
21533 Show whether to use deprecated gdb_index sections."), _("\
21534 When enabled, deprecated .gdb_index sections are used anyway.\n\
21535 Normally they are ignored either because of a missing feature or\n\
21536 performance issue.\n\
21537 Warning: This option must be enabled before gdb reads the file."),
21540 &setlist, &showlist);
21542 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
21544 Save a gdb-index file.\n\
21545 Usage: save gdb-index DIRECTORY"),
21547 set_cmd_completer (c, filename_completer);
21549 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
21550 &dwarf2_locexpr_funcs);
21551 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
21552 &dwarf2_loclist_funcs);
21554 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
21555 &dwarf2_block_frame_base_locexpr_funcs);
21556 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
21557 &dwarf2_block_frame_base_loclist_funcs);