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"
73 #include "gdb_string.h"
74 #include "gdb_assert.h"
75 #include <sys/types.h>
77 typedef struct symbol *symbolp;
80 /* When non-zero, print basic high level tracing messages.
81 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
82 static int dwarf2_read_debug = 0;
84 /* When non-zero, dump DIEs after they are read in. */
85 static unsigned int dwarf2_die_debug = 0;
87 /* When non-zero, cross-check physname against demangler. */
88 static int check_physname = 0;
90 /* When non-zero, do not reject deprecated .gdb_index sections. */
91 static int use_deprecated_index_sections = 0;
93 static const struct objfile_data *dwarf2_objfile_data_key;
95 /* The "aclass" indices for various kinds of computed DWARF symbols. */
97 static int dwarf2_locexpr_index;
98 static int dwarf2_loclist_index;
99 static int dwarf2_locexpr_block_index;
100 static int dwarf2_loclist_block_index;
102 struct dwarf2_section_info
105 const gdb_byte *buffer;
107 /* True if we have tried to read this section. */
111 typedef struct dwarf2_section_info dwarf2_section_info_def;
112 DEF_VEC_O (dwarf2_section_info_def);
114 /* All offsets in the index are of this type. It must be
115 architecture-independent. */
116 typedef uint32_t offset_type;
118 DEF_VEC_I (offset_type);
120 /* Ensure only legit values are used. */
121 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
123 gdb_assert ((unsigned int) (value) <= 1); \
124 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
127 /* Ensure only legit values are used. */
128 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
130 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
131 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
132 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
135 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
136 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
138 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
139 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
142 /* A description of the mapped index. The file format is described in
143 a comment by the code that writes the index. */
146 /* Index data format version. */
149 /* The total length of the buffer. */
152 /* A pointer to the address table data. */
153 const gdb_byte *address_table;
155 /* Size of the address table data in bytes. */
156 offset_type address_table_size;
158 /* The symbol table, implemented as a hash table. */
159 const offset_type *symbol_table;
161 /* Size in slots, each slot is 2 offset_types. */
162 offset_type symbol_table_slots;
164 /* A pointer to the constant pool. */
165 const char *constant_pool;
168 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
169 DEF_VEC_P (dwarf2_per_cu_ptr);
171 /* Collection of data recorded per objfile.
172 This hangs off of dwarf2_objfile_data_key. */
174 struct dwarf2_per_objfile
176 struct dwarf2_section_info info;
177 struct dwarf2_section_info abbrev;
178 struct dwarf2_section_info line;
179 struct dwarf2_section_info loc;
180 struct dwarf2_section_info macinfo;
181 struct dwarf2_section_info macro;
182 struct dwarf2_section_info str;
183 struct dwarf2_section_info ranges;
184 struct dwarf2_section_info addr;
185 struct dwarf2_section_info frame;
186 struct dwarf2_section_info eh_frame;
187 struct dwarf2_section_info gdb_index;
189 VEC (dwarf2_section_info_def) *types;
192 struct objfile *objfile;
194 /* Table of all the compilation units. This is used to locate
195 the target compilation unit of a particular reference. */
196 struct dwarf2_per_cu_data **all_comp_units;
198 /* The number of compilation units in ALL_COMP_UNITS. */
201 /* The number of .debug_types-related CUs. */
204 /* The .debug_types-related CUs (TUs). */
205 struct signatured_type **all_type_units;
207 /* The number of entries in all_type_unit_groups. */
208 int n_type_unit_groups;
210 /* Table of type unit groups.
211 This exists to make it easy to iterate over all CUs and TU groups. */
212 struct type_unit_group **all_type_unit_groups;
214 /* Table of struct type_unit_group objects.
215 The hash key is the DW_AT_stmt_list value. */
216 htab_t type_unit_groups;
218 /* A table mapping .debug_types signatures to its signatured_type entry.
219 This is NULL if the .debug_types section hasn't been read in yet. */
220 htab_t signatured_types;
222 /* Type unit statistics, to see how well the scaling improvements
226 int nr_uniq_abbrev_tables;
228 int nr_symtab_sharers;
229 int nr_stmt_less_type_units;
232 /* A chain of compilation units that are currently read in, so that
233 they can be freed later. */
234 struct dwarf2_per_cu_data *read_in_chain;
236 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
237 This is NULL if the table hasn't been allocated yet. */
240 /* Non-zero if we've check for whether there is a DWP file. */
243 /* The DWP file if there is one, or NULL. */
244 struct dwp_file *dwp_file;
246 /* The shared '.dwz' file, if one exists. This is used when the
247 original data was compressed using 'dwz -m'. */
248 struct dwz_file *dwz_file;
250 /* A flag indicating wether this objfile has a section loaded at a
252 int has_section_at_zero;
254 /* True if we are using the mapped index,
255 or we are faking it for OBJF_READNOW's sake. */
256 unsigned char using_index;
258 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
259 struct mapped_index *index_table;
261 /* When using index_table, this keeps track of all quick_file_names entries.
262 TUs typically share line table entries with a CU, so we maintain a
263 separate table of all line table entries to support the sharing.
264 Note that while there can be way more TUs than CUs, we've already
265 sorted all the TUs into "type unit groups", grouped by their
266 DW_AT_stmt_list value. Therefore the only sharing done here is with a
267 CU and its associated TU group if there is one. */
268 htab_t quick_file_names_table;
270 /* Set during partial symbol reading, to prevent queueing of full
272 int reading_partial_symbols;
274 /* Table mapping type DIEs to their struct type *.
275 This is NULL if not allocated yet.
276 The mapping is done via (CU/TU + DIE offset) -> type. */
277 htab_t die_type_hash;
279 /* The CUs we recently read. */
280 VEC (dwarf2_per_cu_ptr) *just_read_cus;
283 static struct dwarf2_per_objfile *dwarf2_per_objfile;
285 /* Default names of the debugging sections. */
287 /* Note that if the debugging section has been compressed, it might
288 have a name like .zdebug_info. */
290 static const struct dwarf2_debug_sections dwarf2_elf_names =
292 { ".debug_info", ".zdebug_info" },
293 { ".debug_abbrev", ".zdebug_abbrev" },
294 { ".debug_line", ".zdebug_line" },
295 { ".debug_loc", ".zdebug_loc" },
296 { ".debug_macinfo", ".zdebug_macinfo" },
297 { ".debug_macro", ".zdebug_macro" },
298 { ".debug_str", ".zdebug_str" },
299 { ".debug_ranges", ".zdebug_ranges" },
300 { ".debug_types", ".zdebug_types" },
301 { ".debug_addr", ".zdebug_addr" },
302 { ".debug_frame", ".zdebug_frame" },
303 { ".eh_frame", NULL },
304 { ".gdb_index", ".zgdb_index" },
308 /* List of DWO/DWP sections. */
310 static const struct dwop_section_names
312 struct dwarf2_section_names abbrev_dwo;
313 struct dwarf2_section_names info_dwo;
314 struct dwarf2_section_names line_dwo;
315 struct dwarf2_section_names loc_dwo;
316 struct dwarf2_section_names macinfo_dwo;
317 struct dwarf2_section_names macro_dwo;
318 struct dwarf2_section_names str_dwo;
319 struct dwarf2_section_names str_offsets_dwo;
320 struct dwarf2_section_names types_dwo;
321 struct dwarf2_section_names cu_index;
322 struct dwarf2_section_names tu_index;
326 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
327 { ".debug_info.dwo", ".zdebug_info.dwo" },
328 { ".debug_line.dwo", ".zdebug_line.dwo" },
329 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
330 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
331 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
332 { ".debug_str.dwo", ".zdebug_str.dwo" },
333 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
334 { ".debug_types.dwo", ".zdebug_types.dwo" },
335 { ".debug_cu_index", ".zdebug_cu_index" },
336 { ".debug_tu_index", ".zdebug_tu_index" },
339 /* local data types */
341 /* The data in a compilation unit header, after target2host
342 translation, looks like this. */
343 struct comp_unit_head
347 unsigned char addr_size;
348 unsigned char signed_addr_p;
349 sect_offset abbrev_offset;
351 /* Size of file offsets; either 4 or 8. */
352 unsigned int offset_size;
354 /* Size of the length field; either 4 or 12. */
355 unsigned int initial_length_size;
357 /* Offset to the first byte of this compilation unit header in the
358 .debug_info section, for resolving relative reference dies. */
361 /* Offset to first die in this cu from the start of the cu.
362 This will be the first byte following the compilation unit header. */
363 cu_offset first_die_offset;
366 /* Type used for delaying computation of method physnames.
367 See comments for compute_delayed_physnames. */
368 struct delayed_method_info
370 /* The type to which the method is attached, i.e., its parent class. */
373 /* The index of the method in the type's function fieldlists. */
376 /* The index of the method in the fieldlist. */
379 /* The name of the DIE. */
382 /* The DIE associated with this method. */
383 struct die_info *die;
386 typedef struct delayed_method_info delayed_method_info;
387 DEF_VEC_O (delayed_method_info);
389 /* Internal state when decoding a particular compilation unit. */
392 /* The objfile containing this compilation unit. */
393 struct objfile *objfile;
395 /* The header of the compilation unit. */
396 struct comp_unit_head header;
398 /* Base address of this compilation unit. */
399 CORE_ADDR base_address;
401 /* Non-zero if base_address has been set. */
404 /* The language we are debugging. */
405 enum language language;
406 const struct language_defn *language_defn;
408 const char *producer;
410 /* The generic symbol table building routines have separate lists for
411 file scope symbols and all all other scopes (local scopes). So
412 we need to select the right one to pass to add_symbol_to_list().
413 We do it by keeping a pointer to the correct list in list_in_scope.
415 FIXME: The original dwarf code just treated the file scope as the
416 first local scope, and all other local scopes as nested local
417 scopes, and worked fine. Check to see if we really need to
418 distinguish these in buildsym.c. */
419 struct pending **list_in_scope;
421 /* The abbrev table for this CU.
422 Normally this points to the abbrev table in the objfile.
423 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
424 struct abbrev_table *abbrev_table;
426 /* Hash table holding all the loaded partial DIEs
427 with partial_die->offset.SECT_OFF as hash. */
430 /* Storage for things with the same lifetime as this read-in compilation
431 unit, including partial DIEs. */
432 struct obstack comp_unit_obstack;
434 /* When multiple dwarf2_cu structures are living in memory, this field
435 chains them all together, so that they can be released efficiently.
436 We will probably also want a generation counter so that most-recently-used
437 compilation units are cached... */
438 struct dwarf2_per_cu_data *read_in_chain;
440 /* Backchain to our per_cu entry if the tree has been built. */
441 struct dwarf2_per_cu_data *per_cu;
443 /* How many compilation units ago was this CU last referenced? */
446 /* A hash table of DIE cu_offset for following references with
447 die_info->offset.sect_off as hash. */
450 /* Full DIEs if read in. */
451 struct die_info *dies;
453 /* A set of pointers to dwarf2_per_cu_data objects for compilation
454 units referenced by this one. Only set during full symbol processing;
455 partial symbol tables do not have dependencies. */
458 /* Header data from the line table, during full symbol processing. */
459 struct line_header *line_header;
461 /* A list of methods which need to have physnames computed
462 after all type information has been read. */
463 VEC (delayed_method_info) *method_list;
465 /* To be copied to symtab->call_site_htab. */
466 htab_t call_site_htab;
468 /* Non-NULL if this CU came from a DWO file.
469 There is an invariant here that is important to remember:
470 Except for attributes copied from the top level DIE in the "main"
471 (or "stub") file in preparation for reading the DWO file
472 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
473 Either there isn't a DWO file (in which case this is NULL and the point
474 is moot), or there is and either we're not going to read it (in which
475 case this is NULL) or there is and we are reading it (in which case this
477 struct dwo_unit *dwo_unit;
479 /* The DW_AT_addr_base attribute if present, zero otherwise
480 (zero is a valid value though).
481 Note this value comes from the stub CU/TU's DIE. */
484 /* The DW_AT_ranges_base attribute if present, zero otherwise
485 (zero is a valid value though).
486 Note this value comes from the stub CU/TU's DIE.
487 Also note that the value is zero in the non-DWO case so this value can
488 be used without needing to know whether DWO files are in use or not.
489 N.B. This does not apply to DW_AT_ranges appearing in
490 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
491 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
492 DW_AT_ranges_base *would* have to be applied, and we'd have to care
493 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
494 ULONGEST ranges_base;
496 /* Mark used when releasing cached dies. */
497 unsigned int mark : 1;
499 /* This CU references .debug_loc. See the symtab->locations_valid field.
500 This test is imperfect as there may exist optimized debug code not using
501 any location list and still facing inlining issues if handled as
502 unoptimized code. For a future better test see GCC PR other/32998. */
503 unsigned int has_loclist : 1;
505 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
506 if all the producer_is_* fields are valid. This information is cached
507 because profiling CU expansion showed excessive time spent in
508 producer_is_gxx_lt_4_6. */
509 unsigned int checked_producer : 1;
510 unsigned int producer_is_gxx_lt_4_6 : 1;
511 unsigned int producer_is_gcc_lt_4_3 : 1;
512 unsigned int producer_is_icc : 1;
514 /* When set, the file that we're processing is known to have
515 debugging info for C++ namespaces. GCC 3.3.x did not produce
516 this information, but later versions do. */
518 unsigned int processing_has_namespace_info : 1;
521 /* Persistent data held for a compilation unit, even when not
522 processing it. We put a pointer to this structure in the
523 read_symtab_private field of the psymtab. */
525 struct dwarf2_per_cu_data
527 /* The start offset and length of this compilation unit.
528 NOTE: Unlike comp_unit_head.length, this length includes
530 If the DIE refers to a DWO file, this is always of the original die,
535 /* Flag indicating this compilation unit will be read in before
536 any of the current compilation units are processed. */
537 unsigned int queued : 1;
539 /* This flag will be set when reading partial DIEs if we need to load
540 absolutely all DIEs for this compilation unit, instead of just the ones
541 we think are interesting. It gets set if we look for a DIE in the
542 hash table and don't find it. */
543 unsigned int load_all_dies : 1;
545 /* Non-zero if this CU is from .debug_types.
546 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
548 unsigned int is_debug_types : 1;
550 /* Non-zero if this CU is from the .dwz file. */
551 unsigned int is_dwz : 1;
553 /* The section this CU/TU lives in.
554 If the DIE refers to a DWO file, this is always the original die,
556 struct dwarf2_section_info *section;
558 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
559 of the CU cache it gets reset to NULL again. */
560 struct dwarf2_cu *cu;
562 /* The corresponding objfile.
563 Normally we can get the objfile from dwarf2_per_objfile.
564 However we can enter this file with just a "per_cu" handle. */
565 struct objfile *objfile;
567 /* When using partial symbol tables, the 'psymtab' field is active.
568 Otherwise the 'quick' field is active. */
571 /* The partial symbol table associated with this compilation unit,
572 or NULL for unread partial units. */
573 struct partial_symtab *psymtab;
575 /* Data needed by the "quick" functions. */
576 struct dwarf2_per_cu_quick_data *quick;
579 /* The CUs we import using DW_TAG_imported_unit. This is filled in
580 while reading psymtabs, used to compute the psymtab dependencies,
581 and then cleared. Then it is filled in again while reading full
582 symbols, and only deleted when the objfile is destroyed.
584 This is also used to work around a difference between the way gold
585 generates .gdb_index version <=7 and the way gdb does. Arguably this
586 is a gold bug. For symbols coming from TUs, gold records in the index
587 the CU that includes the TU instead of the TU itself. This breaks
588 dw2_lookup_symbol: It assumes that if the index says symbol X lives
589 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
590 will find X. Alas TUs live in their own symtab, so after expanding CU Y
591 we need to look in TU Z to find X. Fortunately, this is akin to
592 DW_TAG_imported_unit, so we just use the same mechanism: For
593 .gdb_index version <=7 this also records the TUs that the CU referred
594 to. Concurrently with this change gdb was modified to emit version 8
595 indices so we only pay a price for gold generated indices. */
596 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
599 /* Entry in the signatured_types hash table. */
601 struct signatured_type
603 /* The "per_cu" object of this type.
604 This struct is used iff per_cu.is_debug_types.
605 N.B.: This is the first member so that it's easy to convert pointers
607 struct dwarf2_per_cu_data per_cu;
609 /* The type's signature. */
612 /* Offset in the TU of the type's DIE, as read from the TU header.
613 If this TU is a DWO stub and the definition lives in a DWO file
614 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
615 cu_offset type_offset_in_tu;
617 /* Offset in the section of the type's DIE.
618 If the definition lives in a DWO file, this is the offset in the
619 .debug_types.dwo section.
620 The value is zero until the actual value is known.
621 Zero is otherwise not a valid section offset. */
622 sect_offset type_offset_in_section;
624 /* Type units are grouped by their DW_AT_stmt_list entry so that they
625 can share them. This points to the containing symtab. */
626 struct type_unit_group *type_unit_group;
629 The first time we encounter this type we fully read it in and install it
630 in the symbol tables. Subsequent times we only need the type. */
634 typedef struct signatured_type *sig_type_ptr;
635 DEF_VEC_P (sig_type_ptr);
637 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
638 This includes type_unit_group and quick_file_names. */
640 struct stmt_list_hash
642 /* The DWO unit this table is from or NULL if there is none. */
643 struct dwo_unit *dwo_unit;
645 /* Offset in .debug_line or .debug_line.dwo. */
646 sect_offset line_offset;
649 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
650 an object of this type. */
652 struct type_unit_group
654 /* dwarf2read.c's main "handle" on a TU symtab.
655 To simplify things we create an artificial CU that "includes" all the
656 type units using this stmt_list so that the rest of the code still has
657 a "per_cu" handle on the symtab.
658 This PER_CU is recognized by having no section. */
659 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
660 struct dwarf2_per_cu_data per_cu;
662 /* The TUs that share this DW_AT_stmt_list entry.
663 This is added to while parsing type units to build partial symtabs,
664 and is deleted afterwards and not used again. */
665 VEC (sig_type_ptr) *tus;
667 /* The primary symtab.
668 Type units in a group needn't all be defined in the same source file,
669 so we create an essentially anonymous symtab as the primary symtab. */
670 struct symtab *primary_symtab;
672 /* The data used to construct the hash key. */
673 struct stmt_list_hash hash;
675 /* The number of symtabs from the line header.
676 The value here must match line_header.num_file_names. */
677 unsigned int num_symtabs;
679 /* The symbol tables for this TU (obtained from the files listed in
681 WARNING: The order of entries here must match the order of entries
682 in the line header. After the first TU using this type_unit_group, the
683 line header for the subsequent TUs is recreated from this. This is done
684 because we need to use the same symtabs for each TU using the same
685 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
686 there's no guarantee the line header doesn't have duplicate entries. */
687 struct symtab **symtabs;
690 /* These sections are what may appear in a DWO file. */
694 struct dwarf2_section_info abbrev;
695 struct dwarf2_section_info line;
696 struct dwarf2_section_info loc;
697 struct dwarf2_section_info macinfo;
698 struct dwarf2_section_info macro;
699 struct dwarf2_section_info str;
700 struct dwarf2_section_info str_offsets;
701 /* In the case of a virtual DWO file, these two are unused. */
702 struct dwarf2_section_info info;
703 VEC (dwarf2_section_info_def) *types;
706 /* CUs/TUs in DWP/DWO files. */
710 /* Backlink to the containing struct dwo_file. */
711 struct dwo_file *dwo_file;
713 /* The "id" that distinguishes this CU/TU.
714 .debug_info calls this "dwo_id", .debug_types calls this "signature".
715 Since signatures came first, we stick with it for consistency. */
718 /* The section this CU/TU lives in, in the DWO file. */
719 struct dwarf2_section_info *section;
721 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
725 /* For types, offset in the type's DIE of the type defined by this TU. */
726 cu_offset type_offset_in_tu;
729 /* Data for one DWO file.
730 This includes virtual DWO files that have been packaged into a
735 /* The DW_AT_GNU_dwo_name attribute.
736 For virtual DWO files the name is constructed from the section offsets
737 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
738 from related CU+TUs. */
739 const char *dwo_name;
741 /* The DW_AT_comp_dir attribute. */
742 const char *comp_dir;
744 /* The bfd, when the file is open. Otherwise this is NULL.
745 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
748 /* Section info for this file. */
749 struct dwo_sections sections;
751 /* The CU in the file.
752 We only support one because having more than one requires hacking the
753 dwo_name of each to match, which is highly unlikely to happen.
754 Doing this means all TUs can share comp_dir: We also assume that
755 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
758 /* Table of TUs in the file.
759 Each element is a struct dwo_unit. */
763 /* These sections are what may appear in a DWP file. */
767 struct dwarf2_section_info str;
768 struct dwarf2_section_info cu_index;
769 struct dwarf2_section_info tu_index;
770 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
771 by section number. We don't need to record them here. */
774 /* These sections are what may appear in a virtual DWO file. */
776 struct virtual_dwo_sections
778 struct dwarf2_section_info abbrev;
779 struct dwarf2_section_info line;
780 struct dwarf2_section_info loc;
781 struct dwarf2_section_info macinfo;
782 struct dwarf2_section_info macro;
783 struct dwarf2_section_info str_offsets;
784 /* Each DWP hash table entry records one CU or one TU.
785 That is recorded here, and copied to dwo_unit.section. */
786 struct dwarf2_section_info info_or_types;
789 /* Contents of DWP hash tables. */
791 struct dwp_hash_table
793 uint32_t nr_units, nr_slots;
794 const gdb_byte *hash_table, *unit_table, *section_pool;
797 /* Data for one DWP file. */
801 /* Name of the file. */
804 /* The bfd, when the file is open. Otherwise this is NULL. */
807 /* Section info for this file. */
808 struct dwp_sections sections;
810 /* Table of CUs in the file. */
811 const struct dwp_hash_table *cus;
813 /* Table of TUs in the file. */
814 const struct dwp_hash_table *tus;
816 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
819 /* Table to map ELF section numbers to their sections. */
820 unsigned int num_sections;
821 asection **elf_sections;
824 /* This represents a '.dwz' file. */
828 /* A dwz file can only contain a few sections. */
829 struct dwarf2_section_info abbrev;
830 struct dwarf2_section_info info;
831 struct dwarf2_section_info str;
832 struct dwarf2_section_info line;
833 struct dwarf2_section_info macro;
834 struct dwarf2_section_info gdb_index;
840 /* Struct used to pass misc. parameters to read_die_and_children, et
841 al. which are used for both .debug_info and .debug_types dies.
842 All parameters here are unchanging for the life of the call. This
843 struct exists to abstract away the constant parameters of die reading. */
845 struct die_reader_specs
847 /* die_section->asection->owner. */
850 /* The CU of the DIE we are parsing. */
851 struct dwarf2_cu *cu;
853 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
854 struct dwo_file *dwo_file;
856 /* The section the die comes from.
857 This is either .debug_info or .debug_types, or the .dwo variants. */
858 struct dwarf2_section_info *die_section;
860 /* die_section->buffer. */
861 const gdb_byte *buffer;
863 /* The end of the buffer. */
864 const gdb_byte *buffer_end;
867 /* Type of function passed to init_cutu_and_read_dies, et.al. */
868 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
869 const gdb_byte *info_ptr,
870 struct die_info *comp_unit_die,
874 /* The line number information for a compilation unit (found in the
875 .debug_line section) begins with a "statement program header",
876 which contains the following information. */
879 unsigned int total_length;
880 unsigned short version;
881 unsigned int header_length;
882 unsigned char minimum_instruction_length;
883 unsigned char maximum_ops_per_instruction;
884 unsigned char default_is_stmt;
886 unsigned char line_range;
887 unsigned char opcode_base;
889 /* standard_opcode_lengths[i] is the number of operands for the
890 standard opcode whose value is i. This means that
891 standard_opcode_lengths[0] is unused, and the last meaningful
892 element is standard_opcode_lengths[opcode_base - 1]. */
893 unsigned char *standard_opcode_lengths;
895 /* The include_directories table. NOTE! These strings are not
896 allocated with xmalloc; instead, they are pointers into
897 debug_line_buffer. If you try to free them, `free' will get
899 unsigned int num_include_dirs, include_dirs_size;
900 const char **include_dirs;
902 /* The file_names table. NOTE! These strings are not allocated
903 with xmalloc; instead, they are pointers into debug_line_buffer.
904 Don't try to free them directly. */
905 unsigned int num_file_names, file_names_size;
909 unsigned int dir_index;
910 unsigned int mod_time;
912 int included_p; /* Non-zero if referenced by the Line Number Program. */
913 struct symtab *symtab; /* The associated symbol table, if any. */
916 /* The start and end of the statement program following this
917 header. These point into dwarf2_per_objfile->line_buffer. */
918 const gdb_byte *statement_program_start, *statement_program_end;
921 /* When we construct a partial symbol table entry we only
922 need this much information. */
923 struct partial_die_info
925 /* Offset of this DIE. */
928 /* DWARF-2 tag for this DIE. */
929 ENUM_BITFIELD(dwarf_tag) tag : 16;
931 /* Assorted flags describing the data found in this DIE. */
932 unsigned int has_children : 1;
933 unsigned int is_external : 1;
934 unsigned int is_declaration : 1;
935 unsigned int has_type : 1;
936 unsigned int has_specification : 1;
937 unsigned int has_pc_info : 1;
938 unsigned int may_be_inlined : 1;
940 /* Flag set if the SCOPE field of this structure has been
942 unsigned int scope_set : 1;
944 /* Flag set if the DIE has a byte_size attribute. */
945 unsigned int has_byte_size : 1;
947 /* Flag set if any of the DIE's children are template arguments. */
948 unsigned int has_template_arguments : 1;
950 /* Flag set if fixup_partial_die has been called on this die. */
951 unsigned int fixup_called : 1;
953 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
954 unsigned int is_dwz : 1;
956 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
957 unsigned int spec_is_dwz : 1;
959 /* The name of this DIE. Normally the value of DW_AT_name, but
960 sometimes a default name for unnamed DIEs. */
963 /* The linkage name, if present. */
964 const char *linkage_name;
966 /* The scope to prepend to our children. This is generally
967 allocated on the comp_unit_obstack, so will disappear
968 when this compilation unit leaves the cache. */
971 /* Some data associated with the partial DIE. The tag determines
972 which field is live. */
975 /* The location description associated with this DIE, if any. */
976 struct dwarf_block *locdesc;
977 /* The offset of an import, for DW_TAG_imported_unit. */
981 /* If HAS_PC_INFO, the PC range associated with this DIE. */
985 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
986 DW_AT_sibling, if any. */
987 /* NOTE: This member isn't strictly necessary, read_partial_die could
988 return DW_AT_sibling values to its caller load_partial_dies. */
989 const gdb_byte *sibling;
991 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
992 DW_AT_specification (or DW_AT_abstract_origin or
994 sect_offset spec_offset;
996 /* Pointers to this DIE's parent, first child, and next sibling,
998 struct partial_die_info *die_parent, *die_child, *die_sibling;
1001 /* This data structure holds the information of an abbrev. */
1004 unsigned int number; /* number identifying abbrev */
1005 enum dwarf_tag tag; /* dwarf tag */
1006 unsigned short has_children; /* boolean */
1007 unsigned short num_attrs; /* number of attributes */
1008 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1009 struct abbrev_info *next; /* next in chain */
1014 ENUM_BITFIELD(dwarf_attribute) name : 16;
1015 ENUM_BITFIELD(dwarf_form) form : 16;
1018 /* Size of abbrev_table.abbrev_hash_table. */
1019 #define ABBREV_HASH_SIZE 121
1021 /* Top level data structure to contain an abbreviation table. */
1025 /* Where the abbrev table came from.
1026 This is used as a sanity check when the table is used. */
1029 /* Storage for the abbrev table. */
1030 struct obstack abbrev_obstack;
1032 /* Hash table of abbrevs.
1033 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1034 It could be statically allocated, but the previous code didn't so we
1036 struct abbrev_info **abbrevs;
1039 /* Attributes have a name and a value. */
1042 ENUM_BITFIELD(dwarf_attribute) name : 16;
1043 ENUM_BITFIELD(dwarf_form) form : 15;
1045 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1046 field should be in u.str (existing only for DW_STRING) but it is kept
1047 here for better struct attribute alignment. */
1048 unsigned int string_is_canonical : 1;
1053 struct dwarf_block *blk;
1062 /* This data structure holds a complete die structure. */
1065 /* DWARF-2 tag for this DIE. */
1066 ENUM_BITFIELD(dwarf_tag) tag : 16;
1068 /* Number of attributes */
1069 unsigned char num_attrs;
1071 /* True if we're presently building the full type name for the
1072 type derived from this DIE. */
1073 unsigned char building_fullname : 1;
1076 unsigned int abbrev;
1078 /* Offset in .debug_info or .debug_types section. */
1081 /* The dies in a compilation unit form an n-ary tree. PARENT
1082 points to this die's parent; CHILD points to the first child of
1083 this node; and all the children of a given node are chained
1084 together via their SIBLING fields. */
1085 struct die_info *child; /* Its first child, if any. */
1086 struct die_info *sibling; /* Its next sibling, if any. */
1087 struct die_info *parent; /* Its parent, if any. */
1089 /* An array of attributes, with NUM_ATTRS elements. There may be
1090 zero, but it's not common and zero-sized arrays are not
1091 sufficiently portable C. */
1092 struct attribute attrs[1];
1095 /* Get at parts of an attribute structure. */
1097 #define DW_STRING(attr) ((attr)->u.str)
1098 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1099 #define DW_UNSND(attr) ((attr)->u.unsnd)
1100 #define DW_BLOCK(attr) ((attr)->u.blk)
1101 #define DW_SND(attr) ((attr)->u.snd)
1102 #define DW_ADDR(attr) ((attr)->u.addr)
1103 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1105 /* Blocks are a bunch of untyped bytes. */
1110 /* Valid only if SIZE is not zero. */
1111 const gdb_byte *data;
1114 #ifndef ATTR_ALLOC_CHUNK
1115 #define ATTR_ALLOC_CHUNK 4
1118 /* Allocate fields for structs, unions and enums in this size. */
1119 #ifndef DW_FIELD_ALLOC_CHUNK
1120 #define DW_FIELD_ALLOC_CHUNK 4
1123 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1124 but this would require a corresponding change in unpack_field_as_long
1126 static int bits_per_byte = 8;
1128 /* The routines that read and process dies for a C struct or C++ class
1129 pass lists of data member fields and lists of member function fields
1130 in an instance of a field_info structure, as defined below. */
1133 /* List of data member and baseclasses fields. */
1136 struct nextfield *next;
1141 *fields, *baseclasses;
1143 /* Number of fields (including baseclasses). */
1146 /* Number of baseclasses. */
1149 /* Set if the accesibility of one of the fields is not public. */
1150 int non_public_fields;
1152 /* Member function fields array, entries are allocated in the order they
1153 are encountered in the object file. */
1156 struct nextfnfield *next;
1157 struct fn_field fnfield;
1161 /* Member function fieldlist array, contains name of possibly overloaded
1162 member function, number of overloaded member functions and a pointer
1163 to the head of the member function field chain. */
1168 struct nextfnfield *head;
1172 /* Number of entries in the fnfieldlists array. */
1175 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1176 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1177 struct typedef_field_list
1179 struct typedef_field field;
1180 struct typedef_field_list *next;
1182 *typedef_field_list;
1183 unsigned typedef_field_list_count;
1186 /* One item on the queue of compilation units to read in full symbols
1188 struct dwarf2_queue_item
1190 struct dwarf2_per_cu_data *per_cu;
1191 enum language pretend_language;
1192 struct dwarf2_queue_item *next;
1195 /* The current queue. */
1196 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1198 /* Loaded secondary compilation units are kept in memory until they
1199 have not been referenced for the processing of this many
1200 compilation units. Set this to zero to disable caching. Cache
1201 sizes of up to at least twenty will improve startup time for
1202 typical inter-CU-reference binaries, at an obvious memory cost. */
1203 static int dwarf2_max_cache_age = 5;
1205 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1206 struct cmd_list_element *c, const char *value)
1208 fprintf_filtered (file, _("The upper bound on the age of cached "
1209 "dwarf2 compilation units is %s.\n"),
1214 /* Various complaints about symbol reading that don't abort the process. */
1217 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1219 complaint (&symfile_complaints,
1220 _("statement list doesn't fit in .debug_line section"));
1224 dwarf2_debug_line_missing_file_complaint (void)
1226 complaint (&symfile_complaints,
1227 _(".debug_line section has line data without a file"));
1231 dwarf2_debug_line_missing_end_sequence_complaint (void)
1233 complaint (&symfile_complaints,
1234 _(".debug_line section has line "
1235 "program sequence without an end"));
1239 dwarf2_complex_location_expr_complaint (void)
1241 complaint (&symfile_complaints, _("location expression too complex"));
1245 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1248 complaint (&symfile_complaints,
1249 _("const value length mismatch for '%s', got %d, expected %d"),
1254 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1256 complaint (&symfile_complaints,
1257 _("debug info runs off end of %s section"
1259 section->asection->name,
1260 bfd_get_filename (section->asection->owner));
1264 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1266 complaint (&symfile_complaints,
1267 _("macro debug info contains a "
1268 "malformed macro definition:\n`%s'"),
1273 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1275 complaint (&symfile_complaints,
1276 _("invalid attribute class or form for '%s' in '%s'"),
1280 /* local function prototypes */
1282 static void dwarf2_locate_sections (bfd *, asection *, void *);
1284 static void dwarf2_find_base_address (struct die_info *die,
1285 struct dwarf2_cu *cu);
1287 static struct partial_symtab *create_partial_symtab
1288 (struct dwarf2_per_cu_data *per_cu, const char *name);
1290 static void dwarf2_build_psymtabs_hard (struct objfile *);
1292 static void scan_partial_symbols (struct partial_die_info *,
1293 CORE_ADDR *, CORE_ADDR *,
1294 int, struct dwarf2_cu *);
1296 static void add_partial_symbol (struct partial_die_info *,
1297 struct dwarf2_cu *);
1299 static void add_partial_namespace (struct partial_die_info *pdi,
1300 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1301 int need_pc, struct dwarf2_cu *cu);
1303 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1304 CORE_ADDR *highpc, int need_pc,
1305 struct dwarf2_cu *cu);
1307 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1308 struct dwarf2_cu *cu);
1310 static void add_partial_subprogram (struct partial_die_info *pdi,
1311 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1312 int need_pc, struct dwarf2_cu *cu);
1314 static void dwarf2_read_symtab (struct partial_symtab *,
1317 static void psymtab_to_symtab_1 (struct partial_symtab *);
1319 static struct abbrev_info *abbrev_table_lookup_abbrev
1320 (const struct abbrev_table *, unsigned int);
1322 static struct abbrev_table *abbrev_table_read_table
1323 (struct dwarf2_section_info *, sect_offset);
1325 static void abbrev_table_free (struct abbrev_table *);
1327 static void abbrev_table_free_cleanup (void *);
1329 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1330 struct dwarf2_section_info *);
1332 static void dwarf2_free_abbrev_table (void *);
1334 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1336 static struct partial_die_info *load_partial_dies
1337 (const struct die_reader_specs *, const gdb_byte *, int);
1339 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1340 struct partial_die_info *,
1341 struct abbrev_info *,
1345 static struct partial_die_info *find_partial_die (sect_offset, int,
1346 struct dwarf2_cu *);
1348 static void fixup_partial_die (struct partial_die_info *,
1349 struct dwarf2_cu *);
1351 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1352 struct attribute *, struct attr_abbrev *,
1355 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1357 static int read_1_signed_byte (bfd *, const gdb_byte *);
1359 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1361 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1363 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1365 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1368 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1370 static LONGEST read_checked_initial_length_and_offset
1371 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1372 unsigned int *, unsigned int *);
1374 static LONGEST read_offset (bfd *, const gdb_byte *,
1375 const struct comp_unit_head *,
1378 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1380 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1383 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1385 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1387 static const char *read_indirect_string (bfd *, const gdb_byte *,
1388 const struct comp_unit_head *,
1391 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1393 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1395 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1397 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1401 static const char *read_str_index (const struct die_reader_specs *reader,
1402 struct dwarf2_cu *cu, ULONGEST str_index);
1404 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1406 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1407 struct dwarf2_cu *);
1409 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1412 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1413 struct dwarf2_cu *cu);
1415 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1417 static struct die_info *die_specification (struct die_info *die,
1418 struct dwarf2_cu **);
1420 static void free_line_header (struct line_header *lh);
1422 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1423 struct dwarf2_cu *cu);
1425 static void dwarf_decode_lines (struct line_header *, const char *,
1426 struct dwarf2_cu *, struct partial_symtab *,
1429 static void dwarf2_start_subfile (const char *, const char *, const char *);
1431 static void dwarf2_start_symtab (struct dwarf2_cu *,
1432 const char *, const char *, CORE_ADDR);
1434 static struct symbol *new_symbol (struct die_info *, struct type *,
1435 struct dwarf2_cu *);
1437 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1438 struct dwarf2_cu *, struct symbol *);
1440 static void dwarf2_const_value (struct attribute *, struct symbol *,
1441 struct dwarf2_cu *);
1443 static void dwarf2_const_value_attr (struct attribute *attr,
1446 struct obstack *obstack,
1447 struct dwarf2_cu *cu, LONGEST *value,
1448 const gdb_byte **bytes,
1449 struct dwarf2_locexpr_baton **baton);
1451 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1453 static int need_gnat_info (struct dwarf2_cu *);
1455 static struct type *die_descriptive_type (struct die_info *,
1456 struct dwarf2_cu *);
1458 static void set_descriptive_type (struct type *, struct die_info *,
1459 struct dwarf2_cu *);
1461 static struct type *die_containing_type (struct die_info *,
1462 struct dwarf2_cu *);
1464 static struct type *lookup_die_type (struct die_info *, struct attribute *,
1465 struct dwarf2_cu *);
1467 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1469 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1471 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1473 static char *typename_concat (struct obstack *obs, const char *prefix,
1474 const char *suffix, int physname,
1475 struct dwarf2_cu *cu);
1477 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1479 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1481 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1483 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1485 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1487 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1488 struct dwarf2_cu *, struct partial_symtab *);
1490 static int dwarf2_get_pc_bounds (struct die_info *,
1491 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1492 struct partial_symtab *);
1494 static void get_scope_pc_bounds (struct die_info *,
1495 CORE_ADDR *, CORE_ADDR *,
1496 struct dwarf2_cu *);
1498 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1499 CORE_ADDR, struct dwarf2_cu *);
1501 static void dwarf2_add_field (struct field_info *, struct die_info *,
1502 struct dwarf2_cu *);
1504 static void dwarf2_attach_fields_to_type (struct field_info *,
1505 struct type *, struct dwarf2_cu *);
1507 static void dwarf2_add_member_fn (struct field_info *,
1508 struct die_info *, struct type *,
1509 struct dwarf2_cu *);
1511 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1513 struct dwarf2_cu *);
1515 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1517 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1519 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1521 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1523 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1525 static struct type *read_module_type (struct die_info *die,
1526 struct dwarf2_cu *cu);
1528 static const char *namespace_name (struct die_info *die,
1529 int *is_anonymous, struct dwarf2_cu *);
1531 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1533 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1535 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1536 struct dwarf2_cu *);
1538 static struct die_info *read_die_and_siblings_1
1539 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1542 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1543 const gdb_byte *info_ptr,
1544 const gdb_byte **new_info_ptr,
1545 struct die_info *parent);
1547 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1548 struct die_info **, const gdb_byte *,
1551 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1552 struct die_info **, const gdb_byte *,
1555 static void process_die (struct die_info *, struct dwarf2_cu *);
1557 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1560 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1562 static const char *dwarf2_full_name (const char *name,
1563 struct die_info *die,
1564 struct dwarf2_cu *cu);
1566 static const char *dwarf2_physname (const char *name, struct die_info *die,
1567 struct dwarf2_cu *cu);
1569 static struct die_info *dwarf2_extension (struct die_info *die,
1570 struct dwarf2_cu **);
1572 static const char *dwarf_tag_name (unsigned int);
1574 static const char *dwarf_attr_name (unsigned int);
1576 static const char *dwarf_form_name (unsigned int);
1578 static char *dwarf_bool_name (unsigned int);
1580 static const char *dwarf_type_encoding_name (unsigned int);
1582 static struct die_info *sibling_die (struct die_info *);
1584 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1586 static void dump_die_for_error (struct die_info *);
1588 static void dump_die_1 (struct ui_file *, int level, int max_level,
1591 /*static*/ void dump_die (struct die_info *, int max_level);
1593 static void store_in_ref_table (struct die_info *,
1594 struct dwarf2_cu *);
1596 static int is_ref_attr (struct attribute *);
1598 static sect_offset dwarf2_get_ref_die_offset (struct attribute *);
1600 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int);
1602 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1604 struct dwarf2_cu **);
1606 static struct die_info *follow_die_ref (struct die_info *,
1608 struct dwarf2_cu **);
1610 static struct die_info *follow_die_sig (struct die_info *,
1612 struct dwarf2_cu **);
1614 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1615 struct dwarf2_cu *);
1617 static struct type *get_DW_AT_signature_type (struct die_info *,
1619 struct dwarf2_cu *);
1621 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1623 static void read_signatured_type (struct signatured_type *);
1625 static struct type_unit_group *get_type_unit_group
1626 (struct dwarf2_cu *, struct attribute *);
1628 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1630 /* memory allocation interface */
1632 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1634 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1636 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1639 static int attr_form_is_block (struct attribute *);
1641 static int attr_form_is_section_offset (struct attribute *);
1643 static int attr_form_is_constant (struct attribute *);
1645 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1646 struct dwarf2_loclist_baton *baton,
1647 struct attribute *attr);
1649 static void dwarf2_symbol_mark_computed (struct attribute *attr,
1651 struct dwarf2_cu *cu,
1654 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1655 const gdb_byte *info_ptr,
1656 struct abbrev_info *abbrev);
1658 static void free_stack_comp_unit (void *);
1660 static hashval_t partial_die_hash (const void *item);
1662 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1664 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1665 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1667 static void init_one_comp_unit (struct dwarf2_cu *cu,
1668 struct dwarf2_per_cu_data *per_cu);
1670 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1671 struct die_info *comp_unit_die,
1672 enum language pretend_language);
1674 static void free_heap_comp_unit (void *);
1676 static void free_cached_comp_units (void *);
1678 static void age_cached_comp_units (void);
1680 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1682 static struct type *set_die_type (struct die_info *, struct type *,
1683 struct dwarf2_cu *);
1685 static void create_all_comp_units (struct objfile *);
1687 static int create_all_type_units (struct objfile *);
1689 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1692 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1695 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1698 static void dwarf2_add_dependence (struct dwarf2_cu *,
1699 struct dwarf2_per_cu_data *);
1701 static void dwarf2_mark (struct dwarf2_cu *);
1703 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1705 static struct type *get_die_type_at_offset (sect_offset,
1706 struct dwarf2_per_cu_data *);
1708 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1710 static void dwarf2_release_queue (void *dummy);
1712 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1713 enum language pretend_language);
1715 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
1716 struct dwarf2_per_cu_data *per_cu,
1717 enum language pretend_language);
1719 static void process_queue (void);
1721 static void find_file_and_directory (struct die_info *die,
1722 struct dwarf2_cu *cu,
1723 const char **name, const char **comp_dir);
1725 static char *file_full_name (int file, struct line_header *lh,
1726 const char *comp_dir);
1728 static const gdb_byte *read_and_check_comp_unit_head
1729 (struct comp_unit_head *header,
1730 struct dwarf2_section_info *section,
1731 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1732 int is_debug_types_section);
1734 static void init_cutu_and_read_dies
1735 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1736 int use_existing_cu, int keep,
1737 die_reader_func_ftype *die_reader_func, void *data);
1739 static void init_cutu_and_read_dies_simple
1740 (struct dwarf2_per_cu_data *this_cu,
1741 die_reader_func_ftype *die_reader_func, void *data);
1743 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1745 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1747 static struct dwo_unit *lookup_dwo_comp_unit
1748 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1750 static struct dwo_unit *lookup_dwo_type_unit
1751 (struct signatured_type *, const char *, const char *);
1753 static void free_dwo_file_cleanup (void *);
1755 static void process_cu_includes (void);
1757 static void check_producer (struct dwarf2_cu *cu);
1761 /* Convert VALUE between big- and little-endian. */
1763 byte_swap (offset_type value)
1767 result = (value & 0xff) << 24;
1768 result |= (value & 0xff00) << 8;
1769 result |= (value & 0xff0000) >> 8;
1770 result |= (value & 0xff000000) >> 24;
1774 #define MAYBE_SWAP(V) byte_swap (V)
1777 #define MAYBE_SWAP(V) (V)
1778 #endif /* WORDS_BIGENDIAN */
1780 /* The suffix for an index file. */
1781 #define INDEX_SUFFIX ".gdb-index"
1783 /* Try to locate the sections we need for DWARF 2 debugging
1784 information and return true if we have enough to do something.
1785 NAMES points to the dwarf2 section names, or is NULL if the standard
1786 ELF names are used. */
1789 dwarf2_has_info (struct objfile *objfile,
1790 const struct dwarf2_debug_sections *names)
1792 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1793 if (!dwarf2_per_objfile)
1795 /* Initialize per-objfile state. */
1796 struct dwarf2_per_objfile *data
1797 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1799 memset (data, 0, sizeof (*data));
1800 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1801 dwarf2_per_objfile = data;
1803 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1805 dwarf2_per_objfile->objfile = objfile;
1807 return (dwarf2_per_objfile->info.asection != NULL
1808 && dwarf2_per_objfile->abbrev.asection != NULL);
1811 /* When loading sections, we look either for uncompressed section or for
1812 compressed section names. */
1815 section_is_p (const char *section_name,
1816 const struct dwarf2_section_names *names)
1818 if (names->normal != NULL
1819 && strcmp (section_name, names->normal) == 0)
1821 if (names->compressed != NULL
1822 && strcmp (section_name, names->compressed) == 0)
1827 /* This function is mapped across the sections and remembers the
1828 offset and size of each of the debugging sections we are interested
1832 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1834 const struct dwarf2_debug_sections *names;
1835 flagword aflag = bfd_get_section_flags (abfd, sectp);
1838 names = &dwarf2_elf_names;
1840 names = (const struct dwarf2_debug_sections *) vnames;
1842 if ((aflag & SEC_HAS_CONTENTS) == 0)
1845 else if (section_is_p (sectp->name, &names->info))
1847 dwarf2_per_objfile->info.asection = sectp;
1848 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1850 else if (section_is_p (sectp->name, &names->abbrev))
1852 dwarf2_per_objfile->abbrev.asection = sectp;
1853 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1855 else if (section_is_p (sectp->name, &names->line))
1857 dwarf2_per_objfile->line.asection = sectp;
1858 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1860 else if (section_is_p (sectp->name, &names->loc))
1862 dwarf2_per_objfile->loc.asection = sectp;
1863 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1865 else if (section_is_p (sectp->name, &names->macinfo))
1867 dwarf2_per_objfile->macinfo.asection = sectp;
1868 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1870 else if (section_is_p (sectp->name, &names->macro))
1872 dwarf2_per_objfile->macro.asection = sectp;
1873 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1875 else if (section_is_p (sectp->name, &names->str))
1877 dwarf2_per_objfile->str.asection = sectp;
1878 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1880 else if (section_is_p (sectp->name, &names->addr))
1882 dwarf2_per_objfile->addr.asection = sectp;
1883 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1885 else if (section_is_p (sectp->name, &names->frame))
1887 dwarf2_per_objfile->frame.asection = sectp;
1888 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1890 else if (section_is_p (sectp->name, &names->eh_frame))
1892 dwarf2_per_objfile->eh_frame.asection = sectp;
1893 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1895 else if (section_is_p (sectp->name, &names->ranges))
1897 dwarf2_per_objfile->ranges.asection = sectp;
1898 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1900 else if (section_is_p (sectp->name, &names->types))
1902 struct dwarf2_section_info type_section;
1904 memset (&type_section, 0, sizeof (type_section));
1905 type_section.asection = sectp;
1906 type_section.size = bfd_get_section_size (sectp);
1908 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1911 else if (section_is_p (sectp->name, &names->gdb_index))
1913 dwarf2_per_objfile->gdb_index.asection = sectp;
1914 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1917 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1918 && bfd_section_vma (abfd, sectp) == 0)
1919 dwarf2_per_objfile->has_section_at_zero = 1;
1922 /* A helper function that decides whether a section is empty,
1926 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1928 return info->asection == NULL || info->size == 0;
1931 /* Read the contents of the section INFO.
1932 OBJFILE is the main object file, but not necessarily the file where
1933 the section comes from. E.g., for DWO files INFO->asection->owner
1934 is the bfd of the DWO file.
1935 If the section is compressed, uncompress it before returning. */
1938 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1940 asection *sectp = info->asection;
1942 gdb_byte *buf, *retbuf;
1943 unsigned char header[4];
1947 info->buffer = NULL;
1950 if (dwarf2_section_empty_p (info))
1953 abfd = sectp->owner;
1955 /* If the section has relocations, we must read it ourselves.
1956 Otherwise we attach it to the BFD. */
1957 if ((sectp->flags & SEC_RELOC) == 0)
1959 info->buffer = gdb_bfd_map_section (sectp, &info->size);
1963 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1966 /* When debugging .o files, we may need to apply relocations; see
1967 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1968 We never compress sections in .o files, so we only need to
1969 try this when the section is not compressed. */
1970 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
1973 info->buffer = retbuf;
1977 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
1978 || bfd_bread (buf, info->size, abfd) != info->size)
1979 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
1980 bfd_get_filename (abfd));
1983 /* A helper function that returns the size of a section in a safe way.
1984 If you are positive that the section has been read before using the
1985 size, then it is safe to refer to the dwarf2_section_info object's
1986 "size" field directly. In other cases, you must call this
1987 function, because for compressed sections the size field is not set
1988 correctly until the section has been read. */
1990 static bfd_size_type
1991 dwarf2_section_size (struct objfile *objfile,
1992 struct dwarf2_section_info *info)
1995 dwarf2_read_section (objfile, info);
1999 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2003 dwarf2_get_section_info (struct objfile *objfile,
2004 enum dwarf2_section_enum sect,
2005 asection **sectp, const gdb_byte **bufp,
2006 bfd_size_type *sizep)
2008 struct dwarf2_per_objfile *data
2009 = objfile_data (objfile, dwarf2_objfile_data_key);
2010 struct dwarf2_section_info *info;
2012 /* We may see an objfile without any DWARF, in which case we just
2023 case DWARF2_DEBUG_FRAME:
2024 info = &data->frame;
2026 case DWARF2_EH_FRAME:
2027 info = &data->eh_frame;
2030 gdb_assert_not_reached ("unexpected section");
2033 dwarf2_read_section (objfile, info);
2035 *sectp = info->asection;
2036 *bufp = info->buffer;
2037 *sizep = info->size;
2040 /* A helper function to find the sections for a .dwz file. */
2043 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2045 struct dwz_file *dwz_file = arg;
2047 /* Note that we only support the standard ELF names, because .dwz
2048 is ELF-only (at the time of writing). */
2049 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2051 dwz_file->abbrev.asection = sectp;
2052 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2054 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2056 dwz_file->info.asection = sectp;
2057 dwz_file->info.size = bfd_get_section_size (sectp);
2059 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2061 dwz_file->str.asection = sectp;
2062 dwz_file->str.size = bfd_get_section_size (sectp);
2064 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2066 dwz_file->line.asection = sectp;
2067 dwz_file->line.size = bfd_get_section_size (sectp);
2069 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2071 dwz_file->macro.asection = sectp;
2072 dwz_file->macro.size = bfd_get_section_size (sectp);
2074 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2076 dwz_file->gdb_index.asection = sectp;
2077 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2081 /* Open the separate '.dwz' debug file, if needed. Error if the file
2084 static struct dwz_file *
2085 dwarf2_get_dwz_file (void)
2087 bfd *abfd, *dwz_bfd;
2090 struct cleanup *cleanup;
2091 const char *filename;
2092 struct dwz_file *result;
2094 if (dwarf2_per_objfile->dwz_file != NULL)
2095 return dwarf2_per_objfile->dwz_file;
2097 abfd = dwarf2_per_objfile->objfile->obfd;
2098 section = bfd_get_section_by_name (abfd, ".gnu_debugaltlink");
2099 if (section == NULL)
2100 error (_("could not find '.gnu_debugaltlink' section"));
2101 if (!bfd_malloc_and_get_section (abfd, section, &data))
2102 error (_("could not read '.gnu_debugaltlink' section: %s"),
2103 bfd_errmsg (bfd_get_error ()));
2104 cleanup = make_cleanup (xfree, data);
2107 if (!IS_ABSOLUTE_PATH (filename))
2109 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name);
2112 make_cleanup (xfree, abs);
2113 abs = ldirname (abs);
2114 make_cleanup (xfree, abs);
2116 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2117 make_cleanup (xfree, rel);
2121 /* The format is just a NUL-terminated file name, followed by the
2122 build-id. For now, though, we ignore the build-id. */
2123 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2124 if (dwz_bfd == NULL)
2125 error (_("could not read '%s': %s"), filename,
2126 bfd_errmsg (bfd_get_error ()));
2128 if (!bfd_check_format (dwz_bfd, bfd_object))
2130 gdb_bfd_unref (dwz_bfd);
2131 error (_("file '%s' was not usable: %s"), filename,
2132 bfd_errmsg (bfd_get_error ()));
2135 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2137 result->dwz_bfd = dwz_bfd;
2139 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2141 do_cleanups (cleanup);
2143 dwarf2_per_objfile->dwz_file = result;
2147 /* DWARF quick_symbols_functions support. */
2149 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2150 unique line tables, so we maintain a separate table of all .debug_line
2151 derived entries to support the sharing.
2152 All the quick functions need is the list of file names. We discard the
2153 line_header when we're done and don't need to record it here. */
2154 struct quick_file_names
2156 /* The data used to construct the hash key. */
2157 struct stmt_list_hash hash;
2159 /* The number of entries in file_names, real_names. */
2160 unsigned int num_file_names;
2162 /* The file names from the line table, after being run through
2164 const char **file_names;
2166 /* The file names from the line table after being run through
2167 gdb_realpath. These are computed lazily. */
2168 const char **real_names;
2171 /* When using the index (and thus not using psymtabs), each CU has an
2172 object of this type. This is used to hold information needed by
2173 the various "quick" methods. */
2174 struct dwarf2_per_cu_quick_data
2176 /* The file table. This can be NULL if there was no file table
2177 or it's currently not read in.
2178 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2179 struct quick_file_names *file_names;
2181 /* The corresponding symbol table. This is NULL if symbols for this
2182 CU have not yet been read. */
2183 struct symtab *symtab;
2185 /* A temporary mark bit used when iterating over all CUs in
2186 expand_symtabs_matching. */
2187 unsigned int mark : 1;
2189 /* True if we've tried to read the file table and found there isn't one.
2190 There will be no point in trying to read it again next time. */
2191 unsigned int no_file_data : 1;
2194 /* Utility hash function for a stmt_list_hash. */
2197 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2201 if (stmt_list_hash->dwo_unit != NULL)
2202 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2203 v += stmt_list_hash->line_offset.sect_off;
2207 /* Utility equality function for a stmt_list_hash. */
2210 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2211 const struct stmt_list_hash *rhs)
2213 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2215 if (lhs->dwo_unit != NULL
2216 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2219 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2222 /* Hash function for a quick_file_names. */
2225 hash_file_name_entry (const void *e)
2227 const struct quick_file_names *file_data = e;
2229 return hash_stmt_list_entry (&file_data->hash);
2232 /* Equality function for a quick_file_names. */
2235 eq_file_name_entry (const void *a, const void *b)
2237 const struct quick_file_names *ea = a;
2238 const struct quick_file_names *eb = b;
2240 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2243 /* Delete function for a quick_file_names. */
2246 delete_file_name_entry (void *e)
2248 struct quick_file_names *file_data = e;
2251 for (i = 0; i < file_data->num_file_names; ++i)
2253 xfree ((void*) file_data->file_names[i]);
2254 if (file_data->real_names)
2255 xfree ((void*) file_data->real_names[i]);
2258 /* The space for the struct itself lives on objfile_obstack,
2259 so we don't free it here. */
2262 /* Create a quick_file_names hash table. */
2265 create_quick_file_names_table (unsigned int nr_initial_entries)
2267 return htab_create_alloc (nr_initial_entries,
2268 hash_file_name_entry, eq_file_name_entry,
2269 delete_file_name_entry, xcalloc, xfree);
2272 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2273 have to be created afterwards. You should call age_cached_comp_units after
2274 processing PER_CU->CU. dw2_setup must have been already called. */
2277 load_cu (struct dwarf2_per_cu_data *per_cu)
2279 if (per_cu->is_debug_types)
2280 load_full_type_unit (per_cu);
2282 load_full_comp_unit (per_cu, language_minimal);
2284 gdb_assert (per_cu->cu != NULL);
2286 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2289 /* Read in the symbols for PER_CU. */
2292 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2294 struct cleanup *back_to;
2296 /* Skip type_unit_groups, reading the type units they contain
2297 is handled elsewhere. */
2298 if (IS_TYPE_UNIT_GROUP (per_cu))
2301 back_to = make_cleanup (dwarf2_release_queue, NULL);
2303 if (dwarf2_per_objfile->using_index
2304 ? per_cu->v.quick->symtab == NULL
2305 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2307 queue_comp_unit (per_cu, language_minimal);
2313 /* Age the cache, releasing compilation units that have not
2314 been used recently. */
2315 age_cached_comp_units ();
2317 do_cleanups (back_to);
2320 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2321 the objfile from which this CU came. Returns the resulting symbol
2324 static struct symtab *
2325 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2327 gdb_assert (dwarf2_per_objfile->using_index);
2328 if (!per_cu->v.quick->symtab)
2330 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2331 increment_reading_symtab ();
2332 dw2_do_instantiate_symtab (per_cu);
2333 process_cu_includes ();
2334 do_cleanups (back_to);
2336 return per_cu->v.quick->symtab;
2339 /* Return the CU given its index.
2341 This is intended for loops like:
2343 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2344 + dwarf2_per_objfile->n_type_units); ++i)
2346 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2352 static struct dwarf2_per_cu_data *
2353 dw2_get_cu (int index)
2355 if (index >= dwarf2_per_objfile->n_comp_units)
2357 index -= dwarf2_per_objfile->n_comp_units;
2358 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2359 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2362 return dwarf2_per_objfile->all_comp_units[index];
2365 /* Return the primary CU given its index.
2366 The difference between this function and dw2_get_cu is in the handling
2367 of type units (TUs). Here we return the type_unit_group object.
2369 This is intended for loops like:
2371 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2372 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2374 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2380 static struct dwarf2_per_cu_data *
2381 dw2_get_primary_cu (int index)
2383 if (index >= dwarf2_per_objfile->n_comp_units)
2385 index -= dwarf2_per_objfile->n_comp_units;
2386 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2387 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2390 return dwarf2_per_objfile->all_comp_units[index];
2393 /* A helper for create_cus_from_index that handles a given list of
2397 create_cus_from_index_list (struct objfile *objfile,
2398 const gdb_byte *cu_list, offset_type n_elements,
2399 struct dwarf2_section_info *section,
2405 for (i = 0; i < n_elements; i += 2)
2407 struct dwarf2_per_cu_data *the_cu;
2408 ULONGEST offset, length;
2410 gdb_static_assert (sizeof (ULONGEST) >= 8);
2411 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2412 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2415 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2416 struct dwarf2_per_cu_data);
2417 the_cu->offset.sect_off = offset;
2418 the_cu->length = length;
2419 the_cu->objfile = objfile;
2420 the_cu->section = section;
2421 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2422 struct dwarf2_per_cu_quick_data);
2423 the_cu->is_dwz = is_dwz;
2424 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2428 /* Read the CU list from the mapped index, and use it to create all
2429 the CU objects for this objfile. */
2432 create_cus_from_index (struct objfile *objfile,
2433 const gdb_byte *cu_list, offset_type cu_list_elements,
2434 const gdb_byte *dwz_list, offset_type dwz_elements)
2436 struct dwz_file *dwz;
2438 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2439 dwarf2_per_objfile->all_comp_units
2440 = obstack_alloc (&objfile->objfile_obstack,
2441 dwarf2_per_objfile->n_comp_units
2442 * sizeof (struct dwarf2_per_cu_data *));
2444 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2445 &dwarf2_per_objfile->info, 0, 0);
2447 if (dwz_elements == 0)
2450 dwz = dwarf2_get_dwz_file ();
2451 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2452 cu_list_elements / 2);
2455 /* Create the signatured type hash table from the index. */
2458 create_signatured_type_table_from_index (struct objfile *objfile,
2459 struct dwarf2_section_info *section,
2460 const gdb_byte *bytes,
2461 offset_type elements)
2464 htab_t sig_types_hash;
2466 dwarf2_per_objfile->n_type_units = elements / 3;
2467 dwarf2_per_objfile->all_type_units
2468 = obstack_alloc (&objfile->objfile_obstack,
2469 dwarf2_per_objfile->n_type_units
2470 * sizeof (struct signatured_type *));
2472 sig_types_hash = allocate_signatured_type_table (objfile);
2474 for (i = 0; i < elements; i += 3)
2476 struct signatured_type *sig_type;
2477 ULONGEST offset, type_offset_in_tu, signature;
2480 gdb_static_assert (sizeof (ULONGEST) >= 8);
2481 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2482 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2484 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2487 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2488 struct signatured_type);
2489 sig_type->signature = signature;
2490 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2491 sig_type->per_cu.is_debug_types = 1;
2492 sig_type->per_cu.section = section;
2493 sig_type->per_cu.offset.sect_off = offset;
2494 sig_type->per_cu.objfile = objfile;
2495 sig_type->per_cu.v.quick
2496 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2497 struct dwarf2_per_cu_quick_data);
2499 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2502 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2505 dwarf2_per_objfile->signatured_types = sig_types_hash;
2508 /* Read the address map data from the mapped index, and use it to
2509 populate the objfile's psymtabs_addrmap. */
2512 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2514 const gdb_byte *iter, *end;
2515 struct obstack temp_obstack;
2516 struct addrmap *mutable_map;
2517 struct cleanup *cleanup;
2520 obstack_init (&temp_obstack);
2521 cleanup = make_cleanup_obstack_free (&temp_obstack);
2522 mutable_map = addrmap_create_mutable (&temp_obstack);
2524 iter = index->address_table;
2525 end = iter + index->address_table_size;
2527 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2531 ULONGEST hi, lo, cu_index;
2532 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2534 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2536 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2539 if (cu_index < dwarf2_per_objfile->n_comp_units)
2541 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2542 dw2_get_cu (cu_index));
2546 complaint (&symfile_complaints,
2547 _(".gdb_index address table has invalid CU number %u"),
2548 (unsigned) cu_index);
2552 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2553 &objfile->objfile_obstack);
2554 do_cleanups (cleanup);
2557 /* The hash function for strings in the mapped index. This is the same as
2558 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2559 implementation. This is necessary because the hash function is tied to the
2560 format of the mapped index file. The hash values do not have to match with
2563 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2566 mapped_index_string_hash (int index_version, const void *p)
2568 const unsigned char *str = (const unsigned char *) p;
2572 while ((c = *str++) != 0)
2574 if (index_version >= 5)
2576 r = r * 67 + c - 113;
2582 /* Find a slot in the mapped index INDEX for the object named NAME.
2583 If NAME is found, set *VEC_OUT to point to the CU vector in the
2584 constant pool and return 1. If NAME cannot be found, return 0. */
2587 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2588 offset_type **vec_out)
2590 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2592 offset_type slot, step;
2593 int (*cmp) (const char *, const char *);
2595 if (current_language->la_language == language_cplus
2596 || current_language->la_language == language_java
2597 || current_language->la_language == language_fortran)
2599 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2601 const char *paren = strchr (name, '(');
2607 dup = xmalloc (paren - name + 1);
2608 memcpy (dup, name, paren - name);
2609 dup[paren - name] = 0;
2611 make_cleanup (xfree, dup);
2616 /* Index version 4 did not support case insensitive searches. But the
2617 indices for case insensitive languages are built in lowercase, therefore
2618 simulate our NAME being searched is also lowercased. */
2619 hash = mapped_index_string_hash ((index->version == 4
2620 && case_sensitivity == case_sensitive_off
2621 ? 5 : index->version),
2624 slot = hash & (index->symbol_table_slots - 1);
2625 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2626 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2630 /* Convert a slot number to an offset into the table. */
2631 offset_type i = 2 * slot;
2633 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2635 do_cleanups (back_to);
2639 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2640 if (!cmp (name, str))
2642 *vec_out = (offset_type *) (index->constant_pool
2643 + MAYBE_SWAP (index->symbol_table[i + 1]));
2644 do_cleanups (back_to);
2648 slot = (slot + step) & (index->symbol_table_slots - 1);
2652 /* A helper function that reads the .gdb_index from SECTION and fills
2653 in MAP. FILENAME is the name of the file containing the section;
2654 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2655 ok to use deprecated sections.
2657 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2658 out parameters that are filled in with information about the CU and
2659 TU lists in the section.
2661 Returns 1 if all went well, 0 otherwise. */
2664 read_index_from_section (struct objfile *objfile,
2665 const char *filename,
2667 struct dwarf2_section_info *section,
2668 struct mapped_index *map,
2669 const gdb_byte **cu_list,
2670 offset_type *cu_list_elements,
2671 const gdb_byte **types_list,
2672 offset_type *types_list_elements)
2674 const gdb_byte *addr;
2675 offset_type version;
2676 offset_type *metadata;
2679 if (dwarf2_section_empty_p (section))
2682 /* Older elfutils strip versions could keep the section in the main
2683 executable while splitting it for the separate debug info file. */
2684 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2687 dwarf2_read_section (objfile, section);
2689 addr = section->buffer;
2690 /* Version check. */
2691 version = MAYBE_SWAP (*(offset_type *) addr);
2692 /* Versions earlier than 3 emitted every copy of a psymbol. This
2693 causes the index to behave very poorly for certain requests. Version 3
2694 contained incomplete addrmap. So, it seems better to just ignore such
2698 static int warning_printed = 0;
2699 if (!warning_printed)
2701 warning (_("Skipping obsolete .gdb_index section in %s."),
2703 warning_printed = 1;
2707 /* Index version 4 uses a different hash function than index version
2710 Versions earlier than 6 did not emit psymbols for inlined
2711 functions. Using these files will cause GDB not to be able to
2712 set breakpoints on inlined functions by name, so we ignore these
2713 indices unless the user has done
2714 "set use-deprecated-index-sections on". */
2715 if (version < 6 && !deprecated_ok)
2717 static int warning_printed = 0;
2718 if (!warning_printed)
2721 Skipping deprecated .gdb_index section in %s.\n\
2722 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2723 to use the section anyway."),
2725 warning_printed = 1;
2729 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2730 of the TU (for symbols coming from TUs). It's just a performance bug, and
2731 we can't distinguish gdb-generated indices from gold-generated ones, so
2732 nothing to do here. */
2734 /* Indexes with higher version than the one supported by GDB may be no
2735 longer backward compatible. */
2739 map->version = version;
2740 map->total_size = section->size;
2742 metadata = (offset_type *) (addr + sizeof (offset_type));
2745 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2746 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2750 *types_list = addr + MAYBE_SWAP (metadata[i]);
2751 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2752 - MAYBE_SWAP (metadata[i]))
2756 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2757 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2758 - MAYBE_SWAP (metadata[i]));
2761 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2762 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2763 - MAYBE_SWAP (metadata[i]))
2764 / (2 * sizeof (offset_type)));
2767 map->constant_pool = addr + MAYBE_SWAP (metadata[i]);
2773 /* Read the index file. If everything went ok, initialize the "quick"
2774 elements of all the CUs and return 1. Otherwise, return 0. */
2777 dwarf2_read_index (struct objfile *objfile)
2779 struct mapped_index local_map, *map;
2780 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2781 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2783 if (!read_index_from_section (objfile, objfile->name,
2784 use_deprecated_index_sections,
2785 &dwarf2_per_objfile->gdb_index, &local_map,
2786 &cu_list, &cu_list_elements,
2787 &types_list, &types_list_elements))
2790 /* Don't use the index if it's empty. */
2791 if (local_map.symbol_table_slots == 0)
2794 /* If there is a .dwz file, read it so we can get its CU list as
2796 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
2798 struct dwz_file *dwz = dwarf2_get_dwz_file ();
2799 struct mapped_index dwz_map;
2800 const gdb_byte *dwz_types_ignore;
2801 offset_type dwz_types_elements_ignore;
2803 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2805 &dwz->gdb_index, &dwz_map,
2806 &dwz_list, &dwz_list_elements,
2808 &dwz_types_elements_ignore))
2810 warning (_("could not read '.gdb_index' section from %s; skipping"),
2811 bfd_get_filename (dwz->dwz_bfd));
2816 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2819 if (types_list_elements)
2821 struct dwarf2_section_info *section;
2823 /* We can only handle a single .debug_types when we have an
2825 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2828 section = VEC_index (dwarf2_section_info_def,
2829 dwarf2_per_objfile->types, 0);
2831 create_signatured_type_table_from_index (objfile, section, types_list,
2832 types_list_elements);
2835 create_addrmap_from_index (objfile, &local_map);
2837 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2840 dwarf2_per_objfile->index_table = map;
2841 dwarf2_per_objfile->using_index = 1;
2842 dwarf2_per_objfile->quick_file_names_table =
2843 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2848 /* A helper for the "quick" functions which sets the global
2849 dwarf2_per_objfile according to OBJFILE. */
2852 dw2_setup (struct objfile *objfile)
2854 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2855 gdb_assert (dwarf2_per_objfile);
2858 /* die_reader_func for dw2_get_file_names. */
2861 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2862 const gdb_byte *info_ptr,
2863 struct die_info *comp_unit_die,
2867 struct dwarf2_cu *cu = reader->cu;
2868 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2869 struct objfile *objfile = dwarf2_per_objfile->objfile;
2870 struct dwarf2_per_cu_data *lh_cu;
2871 struct line_header *lh;
2872 struct attribute *attr;
2874 const char *name, *comp_dir;
2876 struct quick_file_names *qfn;
2877 unsigned int line_offset;
2879 gdb_assert (! this_cu->is_debug_types);
2881 /* Our callers never want to match partial units -- instead they
2882 will match the enclosing full CU. */
2883 if (comp_unit_die->tag == DW_TAG_partial_unit)
2885 this_cu->v.quick->no_file_data = 1;
2894 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2897 struct quick_file_names find_entry;
2899 line_offset = DW_UNSND (attr);
2901 /* We may have already read in this line header (TU line header sharing).
2902 If we have we're done. */
2903 find_entry.hash.dwo_unit = cu->dwo_unit;
2904 find_entry.hash.line_offset.sect_off = line_offset;
2905 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2906 &find_entry, INSERT);
2909 lh_cu->v.quick->file_names = *slot;
2913 lh = dwarf_decode_line_header (line_offset, cu);
2917 lh_cu->v.quick->no_file_data = 1;
2921 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2922 qfn->hash.dwo_unit = cu->dwo_unit;
2923 qfn->hash.line_offset.sect_off = line_offset;
2924 gdb_assert (slot != NULL);
2927 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2929 qfn->num_file_names = lh->num_file_names;
2930 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2931 lh->num_file_names * sizeof (char *));
2932 for (i = 0; i < lh->num_file_names; ++i)
2933 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2934 qfn->real_names = NULL;
2936 free_line_header (lh);
2938 lh_cu->v.quick->file_names = qfn;
2941 /* A helper for the "quick" functions which attempts to read the line
2942 table for THIS_CU. */
2944 static struct quick_file_names *
2945 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
2947 /* This should never be called for TUs. */
2948 gdb_assert (! this_cu->is_debug_types);
2949 /* Nor type unit groups. */
2950 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
2952 if (this_cu->v.quick->file_names != NULL)
2953 return this_cu->v.quick->file_names;
2954 /* If we know there is no line data, no point in looking again. */
2955 if (this_cu->v.quick->no_file_data)
2958 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
2960 if (this_cu->v.quick->no_file_data)
2962 return this_cu->v.quick->file_names;
2965 /* A helper for the "quick" functions which computes and caches the
2966 real path for a given file name from the line table. */
2969 dw2_get_real_path (struct objfile *objfile,
2970 struct quick_file_names *qfn, int index)
2972 if (qfn->real_names == NULL)
2973 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
2974 qfn->num_file_names, sizeof (char *));
2976 if (qfn->real_names[index] == NULL)
2977 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
2979 return qfn->real_names[index];
2982 static struct symtab *
2983 dw2_find_last_source_symtab (struct objfile *objfile)
2987 dw2_setup (objfile);
2988 index = dwarf2_per_objfile->n_comp_units - 1;
2989 return dw2_instantiate_symtab (dw2_get_cu (index));
2992 /* Traversal function for dw2_forget_cached_source_info. */
2995 dw2_free_cached_file_names (void **slot, void *info)
2997 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
2999 if (file_data->real_names)
3003 for (i = 0; i < file_data->num_file_names; ++i)
3005 xfree ((void*) file_data->real_names[i]);
3006 file_data->real_names[i] = NULL;
3014 dw2_forget_cached_source_info (struct objfile *objfile)
3016 dw2_setup (objfile);
3018 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3019 dw2_free_cached_file_names, NULL);
3022 /* Helper function for dw2_map_symtabs_matching_filename that expands
3023 the symtabs and calls the iterator. */
3026 dw2_map_expand_apply (struct objfile *objfile,
3027 struct dwarf2_per_cu_data *per_cu,
3028 const char *name, const char *real_path,
3029 int (*callback) (struct symtab *, void *),
3032 struct symtab *last_made = objfile->symtabs;
3034 /* Don't visit already-expanded CUs. */
3035 if (per_cu->v.quick->symtab)
3038 /* This may expand more than one symtab, and we want to iterate over
3040 dw2_instantiate_symtab (per_cu);
3042 return iterate_over_some_symtabs (name, real_path, callback, data,
3043 objfile->symtabs, last_made);
3046 /* Implementation of the map_symtabs_matching_filename method. */
3049 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3050 const char *real_path,
3051 int (*callback) (struct symtab *, void *),
3055 const char *name_basename = lbasename (name);
3057 dw2_setup (objfile);
3059 /* The rule is CUs specify all the files, including those used by
3060 any TU, so there's no need to scan TUs here. */
3062 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3065 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3066 struct quick_file_names *file_data;
3068 /* We only need to look at symtabs not already expanded. */
3069 if (per_cu->v.quick->symtab)
3072 file_data = dw2_get_file_names (per_cu);
3073 if (file_data == NULL)
3076 for (j = 0; j < file_data->num_file_names; ++j)
3078 const char *this_name = file_data->file_names[j];
3079 const char *this_real_name;
3081 if (compare_filenames_for_search (this_name, name))
3083 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3089 /* Before we invoke realpath, which can get expensive when many
3090 files are involved, do a quick comparison of the basenames. */
3091 if (! basenames_may_differ
3092 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3095 this_real_name = dw2_get_real_path (objfile, file_data, j);
3096 if (compare_filenames_for_search (this_real_name, name))
3098 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3104 if (real_path != NULL)
3106 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3107 gdb_assert (IS_ABSOLUTE_PATH (name));
3108 if (this_real_name != NULL
3109 && FILENAME_CMP (real_path, this_real_name) == 0)
3111 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3123 /* Struct used to manage iterating over all CUs looking for a symbol. */
3125 struct dw2_symtab_iterator
3127 /* The internalized form of .gdb_index. */
3128 struct mapped_index *index;
3129 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3130 int want_specific_block;
3131 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3132 Unused if !WANT_SPECIFIC_BLOCK. */
3134 /* The kind of symbol we're looking for. */
3136 /* The list of CUs from the index entry of the symbol,
3137 or NULL if not found. */
3139 /* The next element in VEC to look at. */
3141 /* The number of elements in VEC, or zero if there is no match. */
3145 /* Initialize the index symtab iterator ITER.
3146 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3147 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3150 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3151 struct mapped_index *index,
3152 int want_specific_block,
3157 iter->index = index;
3158 iter->want_specific_block = want_specific_block;
3159 iter->block_index = block_index;
3160 iter->domain = domain;
3163 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3164 iter->length = MAYBE_SWAP (*iter->vec);
3172 /* Return the next matching CU or NULL if there are no more. */
3174 static struct dwarf2_per_cu_data *
3175 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3177 for ( ; iter->next < iter->length; ++iter->next)
3179 offset_type cu_index_and_attrs =
3180 MAYBE_SWAP (iter->vec[iter->next + 1]);
3181 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3182 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (cu_index);
3183 int want_static = iter->block_index != GLOBAL_BLOCK;
3184 /* This value is only valid for index versions >= 7. */
3185 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3186 gdb_index_symbol_kind symbol_kind =
3187 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3188 /* Only check the symbol attributes if they're present.
3189 Indices prior to version 7 don't record them,
3190 and indices >= 7 may elide them for certain symbols
3191 (gold does this). */
3193 (iter->index->version >= 7
3194 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3196 /* Skip if already read in. */
3197 if (per_cu->v.quick->symtab)
3201 && iter->want_specific_block
3202 && want_static != is_static)
3205 /* Only check the symbol's kind if it has one. */
3208 switch (iter->domain)
3211 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3212 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3213 /* Some types are also in VAR_DOMAIN. */
3214 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3218 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3222 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3237 static struct symtab *
3238 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3239 const char *name, domain_enum domain)
3241 struct symtab *stab_best = NULL;
3242 struct mapped_index *index;
3244 dw2_setup (objfile);
3246 index = dwarf2_per_objfile->index_table;
3248 /* index is NULL if OBJF_READNOW. */
3251 struct dw2_symtab_iterator iter;
3252 struct dwarf2_per_cu_data *per_cu;
3254 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3256 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3258 struct symbol *sym = NULL;
3259 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3261 /* Some caution must be observed with overloaded functions
3262 and methods, since the index will not contain any overload
3263 information (but NAME might contain it). */
3266 struct blockvector *bv = BLOCKVECTOR (stab);
3267 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3269 sym = lookup_block_symbol (block, name, domain);
3272 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3274 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3280 /* Keep looking through other CUs. */
3288 dw2_print_stats (struct objfile *objfile)
3290 int i, total, count;
3292 dw2_setup (objfile);
3293 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3295 for (i = 0; i < total; ++i)
3297 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3299 if (!per_cu->v.quick->symtab)
3302 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3303 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3307 dw2_dump (struct objfile *objfile)
3309 /* Nothing worth printing. */
3313 dw2_relocate (struct objfile *objfile, struct section_offsets *new_offsets,
3314 struct section_offsets *delta)
3316 /* There's nothing to relocate here. */
3320 dw2_expand_symtabs_for_function (struct objfile *objfile,
3321 const char *func_name)
3323 struct mapped_index *index;
3325 dw2_setup (objfile);
3327 index = dwarf2_per_objfile->index_table;
3329 /* index is NULL if OBJF_READNOW. */
3332 struct dw2_symtab_iterator iter;
3333 struct dwarf2_per_cu_data *per_cu;
3335 /* Note: It doesn't matter what we pass for block_index here. */
3336 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3339 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3340 dw2_instantiate_symtab (per_cu);
3345 dw2_expand_all_symtabs (struct objfile *objfile)
3349 dw2_setup (objfile);
3351 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3352 + dwarf2_per_objfile->n_type_units); ++i)
3354 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3356 dw2_instantiate_symtab (per_cu);
3361 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3362 const char *fullname)
3366 dw2_setup (objfile);
3368 /* We don't need to consider type units here.
3369 This is only called for examining code, e.g. expand_line_sal.
3370 There can be an order of magnitude (or more) more type units
3371 than comp units, and we avoid them if we can. */
3373 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3376 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3377 struct quick_file_names *file_data;
3379 /* We only need to look at symtabs not already expanded. */
3380 if (per_cu->v.quick->symtab)
3383 file_data = dw2_get_file_names (per_cu);
3384 if (file_data == NULL)
3387 for (j = 0; j < file_data->num_file_names; ++j)
3389 const char *this_fullname = file_data->file_names[j];
3391 if (filename_cmp (this_fullname, fullname) == 0)
3393 dw2_instantiate_symtab (per_cu);
3400 /* A helper function for dw2_find_symbol_file that finds the primary
3401 file name for a given CU. This is a die_reader_func. */
3404 dw2_get_primary_filename_reader (const struct die_reader_specs *reader,
3405 const gdb_byte *info_ptr,
3406 struct die_info *comp_unit_die,
3410 const char **result_ptr = data;
3411 struct dwarf2_cu *cu = reader->cu;
3412 struct attribute *attr;
3414 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
3418 *result_ptr = DW_STRING (attr);
3422 dw2_find_symbol_file (struct objfile *objfile, const char *name)
3424 struct dwarf2_per_cu_data *per_cu;
3426 const char *filename;
3428 dw2_setup (objfile);
3430 /* index_table is NULL if OBJF_READNOW. */
3431 if (!dwarf2_per_objfile->index_table)
3435 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
3437 struct blockvector *bv = BLOCKVECTOR (s);
3438 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
3439 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN);
3443 /* Only file extension of returned filename is recognized. */
3444 return SYMBOL_SYMTAB (sym)->filename;
3450 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table,
3454 /* Note that this just looks at the very first one named NAME -- but
3455 actually we are looking for a function. find_main_filename
3456 should be rewritten so that it doesn't require a custom hook. It
3457 could just use the ordinary symbol tables. */
3458 /* vec[0] is the length, which must always be >0. */
3459 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1])));
3461 if (per_cu->v.quick->symtab != NULL)
3463 /* Only file extension of returned filename is recognized. */
3464 return per_cu->v.quick->symtab->filename;
3467 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
3468 dw2_get_primary_filename_reader, &filename);
3470 /* Only file extension of returned filename is recognized. */
3475 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3476 struct objfile *objfile, int global,
3477 int (*callback) (struct block *,
3478 struct symbol *, void *),
3479 void *data, symbol_compare_ftype *match,
3480 symbol_compare_ftype *ordered_compare)
3482 /* Currently unimplemented; used for Ada. The function can be called if the
3483 current language is Ada for a non-Ada objfile using GNU index. As Ada
3484 does not look for non-Ada symbols this function should just return. */
3488 dw2_expand_symtabs_matching
3489 (struct objfile *objfile,
3490 int (*file_matcher) (const char *, void *, int basenames),
3491 int (*name_matcher) (const char *, void *),
3492 enum search_domain kind,
3497 struct mapped_index *index;
3499 dw2_setup (objfile);
3501 /* index_table is NULL if OBJF_READNOW. */
3502 if (!dwarf2_per_objfile->index_table)
3504 index = dwarf2_per_objfile->index_table;
3506 if (file_matcher != NULL)
3508 struct cleanup *cleanup;
3509 htab_t visited_found, visited_not_found;
3511 visited_found = htab_create_alloc (10,
3512 htab_hash_pointer, htab_eq_pointer,
3513 NULL, xcalloc, xfree);
3514 cleanup = make_cleanup_htab_delete (visited_found);
3515 visited_not_found = htab_create_alloc (10,
3516 htab_hash_pointer, htab_eq_pointer,
3517 NULL, xcalloc, xfree);
3518 make_cleanup_htab_delete (visited_not_found);
3520 /* The rule is CUs specify all the files, including those used by
3521 any TU, so there's no need to scan TUs here. */
3523 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3526 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3527 struct quick_file_names *file_data;
3530 per_cu->v.quick->mark = 0;
3532 /* We only need to look at symtabs not already expanded. */
3533 if (per_cu->v.quick->symtab)
3536 file_data = dw2_get_file_names (per_cu);
3537 if (file_data == NULL)
3540 if (htab_find (visited_not_found, file_data) != NULL)
3542 else if (htab_find (visited_found, file_data) != NULL)
3544 per_cu->v.quick->mark = 1;
3548 for (j = 0; j < file_data->num_file_names; ++j)
3550 const char *this_real_name;
3552 if (file_matcher (file_data->file_names[j], data, 0))
3554 per_cu->v.quick->mark = 1;
3558 /* Before we invoke realpath, which can get expensive when many
3559 files are involved, do a quick comparison of the basenames. */
3560 if (!basenames_may_differ
3561 && !file_matcher (lbasename (file_data->file_names[j]),
3565 this_real_name = dw2_get_real_path (objfile, file_data, j);
3566 if (file_matcher (this_real_name, data, 0))
3568 per_cu->v.quick->mark = 1;
3573 slot = htab_find_slot (per_cu->v.quick->mark
3575 : visited_not_found,
3580 do_cleanups (cleanup);
3583 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3585 offset_type idx = 2 * iter;
3587 offset_type *vec, vec_len, vec_idx;
3589 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3592 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3594 if (! (*name_matcher) (name, data))
3597 /* The name was matched, now expand corresponding CUs that were
3599 vec = (offset_type *) (index->constant_pool
3600 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3601 vec_len = MAYBE_SWAP (vec[0]);
3602 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3604 struct dwarf2_per_cu_data *per_cu;
3605 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3606 gdb_index_symbol_kind symbol_kind =
3607 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3608 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3610 /* Don't crash on bad data. */
3611 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3612 + dwarf2_per_objfile->n_type_units))
3615 /* Only check the symbol's kind if it has one.
3616 Indices prior to version 7 don't record it. */
3617 if (index->version >= 7)
3621 case VARIABLES_DOMAIN:
3622 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3625 case FUNCTIONS_DOMAIN:
3626 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3630 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3638 per_cu = dw2_get_cu (cu_index);
3639 if (file_matcher == NULL || per_cu->v.quick->mark)
3640 dw2_instantiate_symtab (per_cu);
3645 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3648 static struct symtab *
3649 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3653 if (BLOCKVECTOR (symtab) != NULL
3654 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3657 if (symtab->includes == NULL)
3660 for (i = 0; symtab->includes[i]; ++i)
3662 struct symtab *s = symtab->includes[i];
3664 s = recursively_find_pc_sect_symtab (s, pc);
3672 static struct symtab *
3673 dw2_find_pc_sect_symtab (struct objfile *objfile,
3674 struct minimal_symbol *msymbol,
3676 struct obj_section *section,
3679 struct dwarf2_per_cu_data *data;
3680 struct symtab *result;
3682 dw2_setup (objfile);
3684 if (!objfile->psymtabs_addrmap)
3687 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3691 if (warn_if_readin && data->v.quick->symtab)
3692 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3693 paddress (get_objfile_arch (objfile), pc));
3695 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3696 gdb_assert (result != NULL);
3701 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3702 void *data, int need_fullname)
3705 struct cleanup *cleanup;
3706 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3707 NULL, xcalloc, xfree);
3709 cleanup = make_cleanup_htab_delete (visited);
3710 dw2_setup (objfile);
3712 /* The rule is CUs specify all the files, including those used by
3713 any TU, so there's no need to scan TUs here.
3714 We can ignore file names coming from already-expanded CUs. */
3716 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3718 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3720 if (per_cu->v.quick->symtab)
3722 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3725 *slot = per_cu->v.quick->file_names;
3729 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3732 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3733 struct quick_file_names *file_data;
3736 /* We only need to look at symtabs not already expanded. */
3737 if (per_cu->v.quick->symtab)
3740 file_data = dw2_get_file_names (per_cu);
3741 if (file_data == NULL)
3744 slot = htab_find_slot (visited, file_data, INSERT);
3747 /* Already visited. */
3752 for (j = 0; j < file_data->num_file_names; ++j)
3754 const char *this_real_name;
3757 this_real_name = dw2_get_real_path (objfile, file_data, j);
3759 this_real_name = NULL;
3760 (*fun) (file_data->file_names[j], this_real_name, data);
3764 do_cleanups (cleanup);
3768 dw2_has_symbols (struct objfile *objfile)
3773 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3776 dw2_find_last_source_symtab,
3777 dw2_forget_cached_source_info,
3778 dw2_map_symtabs_matching_filename,
3783 dw2_expand_symtabs_for_function,
3784 dw2_expand_all_symtabs,
3785 dw2_expand_symtabs_with_fullname,
3786 dw2_find_symbol_file,
3787 dw2_map_matching_symbols,
3788 dw2_expand_symtabs_matching,
3789 dw2_find_pc_sect_symtab,
3790 dw2_map_symbol_filenames
3793 /* Initialize for reading DWARF for this objfile. Return 0 if this
3794 file will use psymtabs, or 1 if using the GNU index. */
3797 dwarf2_initialize_objfile (struct objfile *objfile)
3799 /* If we're about to read full symbols, don't bother with the
3800 indices. In this case we also don't care if some other debug
3801 format is making psymtabs, because they are all about to be
3803 if ((objfile->flags & OBJF_READNOW))
3807 dwarf2_per_objfile->using_index = 1;
3808 create_all_comp_units (objfile);
3809 create_all_type_units (objfile);
3810 dwarf2_per_objfile->quick_file_names_table =
3811 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3813 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3814 + dwarf2_per_objfile->n_type_units); ++i)
3816 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3818 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3819 struct dwarf2_per_cu_quick_data);
3822 /* Return 1 so that gdb sees the "quick" functions. However,
3823 these functions will be no-ops because we will have expanded
3828 if (dwarf2_read_index (objfile))
3836 /* Build a partial symbol table. */
3839 dwarf2_build_psymtabs (struct objfile *objfile)
3841 volatile struct gdb_exception except;
3843 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3845 init_psymbol_list (objfile, 1024);
3848 TRY_CATCH (except, RETURN_MASK_ERROR)
3850 /* This isn't really ideal: all the data we allocate on the
3851 objfile's obstack is still uselessly kept around. However,
3852 freeing it seems unsafe. */
3853 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3855 dwarf2_build_psymtabs_hard (objfile);
3856 discard_cleanups (cleanups);
3858 if (except.reason < 0)
3859 exception_print (gdb_stderr, except);
3862 /* Return the total length of the CU described by HEADER. */
3865 get_cu_length (const struct comp_unit_head *header)
3867 return header->initial_length_size + header->length;
3870 /* Return TRUE if OFFSET is within CU_HEADER. */
3873 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3875 sect_offset bottom = { cu_header->offset.sect_off };
3876 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3878 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3881 /* Find the base address of the compilation unit for range lists and
3882 location lists. It will normally be specified by DW_AT_low_pc.
3883 In DWARF-3 draft 4, the base address could be overridden by
3884 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3885 compilation units with discontinuous ranges. */
3888 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3890 struct attribute *attr;
3893 cu->base_address = 0;
3895 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3898 cu->base_address = DW_ADDR (attr);
3903 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3906 cu->base_address = DW_ADDR (attr);
3912 /* Read in the comp unit header information from the debug_info at info_ptr.
3913 NOTE: This leaves members offset, first_die_offset to be filled in
3916 static const gdb_byte *
3917 read_comp_unit_head (struct comp_unit_head *cu_header,
3918 const gdb_byte *info_ptr, bfd *abfd)
3921 unsigned int bytes_read;
3923 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3924 cu_header->initial_length_size = bytes_read;
3925 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3926 info_ptr += bytes_read;
3927 cu_header->version = read_2_bytes (abfd, info_ptr);
3929 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3931 info_ptr += bytes_read;
3932 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3934 signed_addr = bfd_get_sign_extend_vma (abfd);
3935 if (signed_addr < 0)
3936 internal_error (__FILE__, __LINE__,
3937 _("read_comp_unit_head: dwarf from non elf file"));
3938 cu_header->signed_addr_p = signed_addr;
3943 /* Helper function that returns the proper abbrev section for
3946 static struct dwarf2_section_info *
3947 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
3949 struct dwarf2_section_info *abbrev;
3951 if (this_cu->is_dwz)
3952 abbrev = &dwarf2_get_dwz_file ()->abbrev;
3954 abbrev = &dwarf2_per_objfile->abbrev;
3959 /* Subroutine of read_and_check_comp_unit_head and
3960 read_and_check_type_unit_head to simplify them.
3961 Perform various error checking on the header. */
3964 error_check_comp_unit_head (struct comp_unit_head *header,
3965 struct dwarf2_section_info *section,
3966 struct dwarf2_section_info *abbrev_section)
3968 bfd *abfd = section->asection->owner;
3969 const char *filename = bfd_get_filename (abfd);
3971 if (header->version != 2 && header->version != 3 && header->version != 4)
3972 error (_("Dwarf Error: wrong version in compilation unit header "
3973 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
3976 if (header->abbrev_offset.sect_off
3977 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
3978 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
3979 "(offset 0x%lx + 6) [in module %s]"),
3980 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
3983 /* Cast to unsigned long to use 64-bit arithmetic when possible to
3984 avoid potential 32-bit overflow. */
3985 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
3987 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
3988 "(offset 0x%lx + 0) [in module %s]"),
3989 (long) header->length, (long) header->offset.sect_off,
3993 /* Read in a CU/TU header and perform some basic error checking.
3994 The contents of the header are stored in HEADER.
3995 The result is a pointer to the start of the first DIE. */
3997 static const gdb_byte *
3998 read_and_check_comp_unit_head (struct comp_unit_head *header,
3999 struct dwarf2_section_info *section,
4000 struct dwarf2_section_info *abbrev_section,
4001 const gdb_byte *info_ptr,
4002 int is_debug_types_section)
4004 const gdb_byte *beg_of_comp_unit = info_ptr;
4005 bfd *abfd = section->asection->owner;
4007 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4009 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4011 /* If we're reading a type unit, skip over the signature and
4012 type_offset fields. */
4013 if (is_debug_types_section)
4014 info_ptr += 8 /*signature*/ + header->offset_size;
4016 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4018 error_check_comp_unit_head (header, section, abbrev_section);
4023 /* Read in the types comp unit header information from .debug_types entry at
4024 types_ptr. The result is a pointer to one past the end of the header. */
4026 static const gdb_byte *
4027 read_and_check_type_unit_head (struct comp_unit_head *header,
4028 struct dwarf2_section_info *section,
4029 struct dwarf2_section_info *abbrev_section,
4030 const gdb_byte *info_ptr,
4031 ULONGEST *signature,
4032 cu_offset *type_offset_in_tu)
4034 const gdb_byte *beg_of_comp_unit = info_ptr;
4035 bfd *abfd = section->asection->owner;
4037 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4039 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4041 /* If we're reading a type unit, skip over the signature and
4042 type_offset fields. */
4043 if (signature != NULL)
4044 *signature = read_8_bytes (abfd, info_ptr);
4046 if (type_offset_in_tu != NULL)
4047 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4048 header->offset_size);
4049 info_ptr += header->offset_size;
4051 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4053 error_check_comp_unit_head (header, section, abbrev_section);
4058 /* Fetch the abbreviation table offset from a comp or type unit header. */
4061 read_abbrev_offset (struct dwarf2_section_info *section,
4064 bfd *abfd = section->asection->owner;
4065 const gdb_byte *info_ptr;
4066 unsigned int length, initial_length_size, offset_size;
4067 sect_offset abbrev_offset;
4069 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4070 info_ptr = section->buffer + offset.sect_off;
4071 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4072 offset_size = initial_length_size == 4 ? 4 : 8;
4073 info_ptr += initial_length_size + 2 /*version*/;
4074 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4075 return abbrev_offset;
4078 /* Allocate a new partial symtab for file named NAME and mark this new
4079 partial symtab as being an include of PST. */
4082 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4083 struct objfile *objfile)
4085 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4087 if (!IS_ABSOLUTE_PATH (subpst->filename))
4089 /* It shares objfile->objfile_obstack. */
4090 subpst->dirname = pst->dirname;
4093 subpst->section_offsets = pst->section_offsets;
4094 subpst->textlow = 0;
4095 subpst->texthigh = 0;
4097 subpst->dependencies = (struct partial_symtab **)
4098 obstack_alloc (&objfile->objfile_obstack,
4099 sizeof (struct partial_symtab *));
4100 subpst->dependencies[0] = pst;
4101 subpst->number_of_dependencies = 1;
4103 subpst->globals_offset = 0;
4104 subpst->n_global_syms = 0;
4105 subpst->statics_offset = 0;
4106 subpst->n_static_syms = 0;
4107 subpst->symtab = NULL;
4108 subpst->read_symtab = pst->read_symtab;
4111 /* No private part is necessary for include psymtabs. This property
4112 can be used to differentiate between such include psymtabs and
4113 the regular ones. */
4114 subpst->read_symtab_private = NULL;
4117 /* Read the Line Number Program data and extract the list of files
4118 included by the source file represented by PST. Build an include
4119 partial symtab for each of these included files. */
4122 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4123 struct die_info *die,
4124 struct partial_symtab *pst)
4126 struct line_header *lh = NULL;
4127 struct attribute *attr;
4129 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4131 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4133 return; /* No linetable, so no includes. */
4135 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4136 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4138 free_line_header (lh);
4142 hash_signatured_type (const void *item)
4144 const struct signatured_type *sig_type = item;
4146 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4147 return sig_type->signature;
4151 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4153 const struct signatured_type *lhs = item_lhs;
4154 const struct signatured_type *rhs = item_rhs;
4156 return lhs->signature == rhs->signature;
4159 /* Allocate a hash table for signatured types. */
4162 allocate_signatured_type_table (struct objfile *objfile)
4164 return htab_create_alloc_ex (41,
4165 hash_signatured_type,
4168 &objfile->objfile_obstack,
4169 hashtab_obstack_allocate,
4170 dummy_obstack_deallocate);
4173 /* A helper function to add a signatured type CU to a table. */
4176 add_signatured_type_cu_to_table (void **slot, void *datum)
4178 struct signatured_type *sigt = *slot;
4179 struct signatured_type ***datap = datum;
4187 /* Create the hash table of all entries in the .debug_types
4188 (or .debug_types.dwo) section(s).
4189 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4190 otherwise it is NULL.
4192 The result is a pointer to the hash table or NULL if there are no types.
4194 Note: This function processes DWO files only, not DWP files. */
4197 create_debug_types_hash_table (struct dwo_file *dwo_file,
4198 VEC (dwarf2_section_info_def) *types)
4200 struct objfile *objfile = dwarf2_per_objfile->objfile;
4201 htab_t types_htab = NULL;
4203 struct dwarf2_section_info *section;
4204 struct dwarf2_section_info *abbrev_section;
4206 if (VEC_empty (dwarf2_section_info_def, types))
4209 abbrev_section = (dwo_file != NULL
4210 ? &dwo_file->sections.abbrev
4211 : &dwarf2_per_objfile->abbrev);
4213 if (dwarf2_read_debug)
4214 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4215 dwo_file ? ".dwo" : "",
4216 bfd_get_filename (abbrev_section->asection->owner));
4219 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4223 const gdb_byte *info_ptr, *end_ptr;
4224 struct dwarf2_section_info *abbrev_section;
4226 dwarf2_read_section (objfile, section);
4227 info_ptr = section->buffer;
4229 if (info_ptr == NULL)
4232 /* We can't set abfd until now because the section may be empty or
4233 not present, in which case section->asection will be NULL. */
4234 abfd = section->asection->owner;
4237 abbrev_section = &dwo_file->sections.abbrev;
4239 abbrev_section = &dwarf2_per_objfile->abbrev;
4241 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4242 because we don't need to read any dies: the signature is in the
4245 end_ptr = info_ptr + section->size;
4246 while (info_ptr < end_ptr)
4249 cu_offset type_offset_in_tu;
4251 struct signatured_type *sig_type;
4252 struct dwo_unit *dwo_tu;
4254 const gdb_byte *ptr = info_ptr;
4255 struct comp_unit_head header;
4256 unsigned int length;
4258 offset.sect_off = ptr - section->buffer;
4260 /* We need to read the type's signature in order to build the hash
4261 table, but we don't need anything else just yet. */
4263 ptr = read_and_check_type_unit_head (&header, section,
4264 abbrev_section, ptr,
4265 &signature, &type_offset_in_tu);
4267 length = get_cu_length (&header);
4269 /* Skip dummy type units. */
4270 if (ptr >= info_ptr + length
4271 || peek_abbrev_code (abfd, ptr) == 0)
4277 if (types_htab == NULL)
4280 types_htab = allocate_dwo_unit_table (objfile);
4282 types_htab = allocate_signatured_type_table (objfile);
4288 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4290 dwo_tu->dwo_file = dwo_file;
4291 dwo_tu->signature = signature;
4292 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4293 dwo_tu->section = section;
4294 dwo_tu->offset = offset;
4295 dwo_tu->length = length;
4299 /* N.B.: type_offset is not usable if this type uses a DWO file.
4300 The real type_offset is in the DWO file. */
4302 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4303 struct signatured_type);
4304 sig_type->signature = signature;
4305 sig_type->type_offset_in_tu = type_offset_in_tu;
4306 sig_type->per_cu.objfile = objfile;
4307 sig_type->per_cu.is_debug_types = 1;
4308 sig_type->per_cu.section = section;
4309 sig_type->per_cu.offset = offset;
4310 sig_type->per_cu.length = length;
4313 slot = htab_find_slot (types_htab,
4314 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4316 gdb_assert (slot != NULL);
4319 sect_offset dup_offset;
4323 const struct dwo_unit *dup_tu = *slot;
4325 dup_offset = dup_tu->offset;
4329 const struct signatured_type *dup_tu = *slot;
4331 dup_offset = dup_tu->per_cu.offset;
4334 complaint (&symfile_complaints,
4335 _("debug type entry at offset 0x%x is duplicate to"
4336 " the entry at offset 0x%x, signature %s"),
4337 offset.sect_off, dup_offset.sect_off,
4338 hex_string (signature));
4340 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4342 if (dwarf2_read_debug)
4343 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4345 hex_string (signature));
4354 /* Create the hash table of all entries in the .debug_types section,
4355 and initialize all_type_units.
4356 The result is zero if there is an error (e.g. missing .debug_types section),
4357 otherwise non-zero. */
4360 create_all_type_units (struct objfile *objfile)
4363 struct signatured_type **iter;
4365 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4366 if (types_htab == NULL)
4368 dwarf2_per_objfile->signatured_types = NULL;
4372 dwarf2_per_objfile->signatured_types = types_htab;
4374 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4375 dwarf2_per_objfile->all_type_units
4376 = obstack_alloc (&objfile->objfile_obstack,
4377 dwarf2_per_objfile->n_type_units
4378 * sizeof (struct signatured_type *));
4379 iter = &dwarf2_per_objfile->all_type_units[0];
4380 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4381 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4382 == dwarf2_per_objfile->n_type_units);
4387 /* Lookup a signature based type for DW_FORM_ref_sig8.
4388 Returns NULL if signature SIG is not present in the table.
4389 It is up to the caller to complain about this. */
4391 static struct signatured_type *
4392 lookup_signatured_type (ULONGEST sig)
4394 struct signatured_type find_entry, *entry;
4396 if (dwarf2_per_objfile->signatured_types == NULL)
4398 find_entry.signature = sig;
4399 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4403 /* Low level DIE reading support. */
4405 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4408 init_cu_die_reader (struct die_reader_specs *reader,
4409 struct dwarf2_cu *cu,
4410 struct dwarf2_section_info *section,
4411 struct dwo_file *dwo_file)
4413 gdb_assert (section->readin && section->buffer != NULL);
4414 reader->abfd = section->asection->owner;
4416 reader->dwo_file = dwo_file;
4417 reader->die_section = section;
4418 reader->buffer = section->buffer;
4419 reader->buffer_end = section->buffer + section->size;
4422 /* Subroutine of init_cutu_and_read_dies to simplify it.
4423 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4424 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4427 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4428 from it to the DIE in the DWO. If NULL we are skipping the stub.
4429 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4430 are filled in with the info of the DIE from the DWO file.
4431 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4432 provided an abbrev table to use.
4433 The result is non-zero if a valid (non-dummy) DIE was found. */
4436 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4437 struct dwo_unit *dwo_unit,
4438 int abbrev_table_provided,
4439 struct die_info *stub_comp_unit_die,
4440 struct die_reader_specs *result_reader,
4441 const gdb_byte **result_info_ptr,
4442 struct die_info **result_comp_unit_die,
4443 int *result_has_children)
4445 struct objfile *objfile = dwarf2_per_objfile->objfile;
4446 struct dwarf2_cu *cu = this_cu->cu;
4447 struct dwarf2_section_info *section;
4449 const gdb_byte *begin_info_ptr, *info_ptr;
4450 const char *comp_dir_string;
4451 ULONGEST signature; /* Or dwo_id. */
4452 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4453 int i,num_extra_attrs;
4454 struct dwarf2_section_info *dwo_abbrev_section;
4455 struct attribute *attr;
4456 struct die_info *comp_unit_die;
4458 /* These attributes aren't processed until later:
4459 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4460 However, the attribute is found in the stub which we won't have later.
4461 In order to not impose this complication on the rest of the code,
4462 we read them here and copy them to the DWO CU/TU die. */
4470 if (stub_comp_unit_die != NULL)
4472 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4474 if (! this_cu->is_debug_types)
4475 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4476 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4477 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4478 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4479 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4481 /* There should be a DW_AT_addr_base attribute here (if needed).
4482 We need the value before we can process DW_FORM_GNU_addr_index. */
4484 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4486 cu->addr_base = DW_UNSND (attr);
4488 /* There should be a DW_AT_ranges_base attribute here (if needed).
4489 We need the value before we can process DW_AT_ranges. */
4490 cu->ranges_base = 0;
4491 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4493 cu->ranges_base = DW_UNSND (attr);
4496 /* Set up for reading the DWO CU/TU. */
4497 cu->dwo_unit = dwo_unit;
4498 section = dwo_unit->section;
4499 dwarf2_read_section (objfile, section);
4500 abfd = section->asection->owner;
4501 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4502 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4503 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
4505 if (this_cu->is_debug_types)
4507 ULONGEST header_signature;
4508 cu_offset type_offset_in_tu;
4509 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
4511 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4515 &type_offset_in_tu);
4516 gdb_assert (sig_type->signature == header_signature);
4517 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4518 /* For DWOs coming from DWP files, we don't know the CU length
4519 nor the type's offset in the TU until now. */
4520 dwo_unit->length = get_cu_length (&cu->header);
4521 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4523 /* Establish the type offset that can be used to lookup the type.
4524 For DWO files, we don't know it until now. */
4525 sig_type->type_offset_in_section.sect_off =
4526 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4530 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4533 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4534 /* For DWOs coming from DWP files, we don't know the CU length
4536 dwo_unit->length = get_cu_length (&cu->header);
4539 /* Replace the CU's original abbrev table with the DWO's.
4540 Reminder: We can't read the abbrev table until we've read the header. */
4541 if (abbrev_table_provided)
4543 /* Don't free the provided abbrev table, the caller of
4544 init_cutu_and_read_dies owns it. */
4545 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4546 /* Ensure the DWO abbrev table gets freed. */
4547 make_cleanup (dwarf2_free_abbrev_table, cu);
4551 dwarf2_free_abbrev_table (cu);
4552 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4553 /* Leave any existing abbrev table cleanup as is. */
4556 /* Read in the die, but leave space to copy over the attributes
4557 from the stub. This has the benefit of simplifying the rest of
4558 the code - all the work to maintain the illusion of a single
4559 DW_TAG_{compile,type}_unit DIE is done here. */
4560 num_extra_attrs = ((stmt_list != NULL)
4564 + (comp_dir != NULL));
4565 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
4566 result_has_children, num_extra_attrs);
4568 /* Copy over the attributes from the stub to the DIE we just read in. */
4569 comp_unit_die = *result_comp_unit_die;
4570 i = comp_unit_die->num_attrs;
4571 if (stmt_list != NULL)
4572 comp_unit_die->attrs[i++] = *stmt_list;
4574 comp_unit_die->attrs[i++] = *low_pc;
4575 if (high_pc != NULL)
4576 comp_unit_die->attrs[i++] = *high_pc;
4578 comp_unit_die->attrs[i++] = *ranges;
4579 if (comp_dir != NULL)
4580 comp_unit_die->attrs[i++] = *comp_dir;
4581 comp_unit_die->num_attrs += num_extra_attrs;
4583 if (dwarf2_die_debug)
4585 fprintf_unfiltered (gdb_stdlog,
4586 "Read die from %s@0x%x of %s:\n",
4587 bfd_section_name (abfd, section->asection),
4588 (unsigned) (begin_info_ptr - section->buffer),
4589 bfd_get_filename (abfd));
4590 dump_die (comp_unit_die, dwarf2_die_debug);
4593 /* Skip dummy compilation units. */
4594 if (info_ptr >= begin_info_ptr + dwo_unit->length
4595 || peek_abbrev_code (abfd, info_ptr) == 0)
4598 *result_info_ptr = info_ptr;
4602 /* Subroutine of init_cutu_and_read_dies to simplify it.
4603 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
4604 If the specified DWO unit cannot be found an error is thrown. */
4606 static struct dwo_unit *
4607 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
4608 struct die_info *comp_unit_die)
4610 struct dwarf2_cu *cu = this_cu->cu;
4611 struct attribute *attr;
4613 struct dwo_unit *dwo_unit;
4614 const char *comp_dir, *dwo_name;
4616 /* Yeah, we look dwo_name up again, but it simplifies the code. */
4617 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4618 gdb_assert (attr != NULL);
4619 dwo_name = DW_STRING (attr);
4621 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4623 comp_dir = DW_STRING (attr);
4625 if (this_cu->is_debug_types)
4627 struct signatured_type *sig_type;
4629 /* Since this_cu is the first member of struct signatured_type,
4630 we can go from a pointer to one to a pointer to the other. */
4631 sig_type = (struct signatured_type *) this_cu;
4632 signature = sig_type->signature;
4633 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
4637 struct attribute *attr;
4639 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4641 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
4643 dwo_name, this_cu->objfile->name);
4644 signature = DW_UNSND (attr);
4645 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
4649 if (dwo_unit == NULL)
4651 error (_("Dwarf Error: CU at offset 0x%x references unknown DWO"
4652 " with ID %s [in module %s]"),
4653 this_cu->offset.sect_off, hex_string (signature),
4654 this_cu->objfile->name);
4660 /* Initialize a CU (or TU) and read its DIEs.
4661 If the CU defers to a DWO file, read the DWO file as well.
4663 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4664 Otherwise the table specified in the comp unit header is read in and used.
4665 This is an optimization for when we already have the abbrev table.
4667 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4668 Otherwise, a new CU is allocated with xmalloc.
4670 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4671 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4673 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4674 linker) then DIE_READER_FUNC will not get called. */
4677 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
4678 struct abbrev_table *abbrev_table,
4679 int use_existing_cu, int keep,
4680 die_reader_func_ftype *die_reader_func,
4683 struct objfile *objfile = dwarf2_per_objfile->objfile;
4684 struct dwarf2_section_info *section = this_cu->section;
4685 bfd *abfd = section->asection->owner;
4686 struct dwarf2_cu *cu;
4687 const gdb_byte *begin_info_ptr, *info_ptr;
4688 struct die_reader_specs reader;
4689 struct die_info *comp_unit_die;
4691 struct attribute *attr;
4692 struct cleanup *cleanups, *free_cu_cleanup = NULL;
4693 struct signatured_type *sig_type = NULL;
4694 struct dwarf2_section_info *abbrev_section;
4695 /* Non-zero if CU currently points to a DWO file and we need to
4696 reread it. When this happens we need to reread the skeleton die
4697 before we can reread the DWO file. */
4698 int rereading_dwo_cu = 0;
4700 if (dwarf2_die_debug)
4701 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4702 this_cu->is_debug_types ? "type" : "comp",
4703 this_cu->offset.sect_off);
4705 if (use_existing_cu)
4708 cleanups = make_cleanup (null_cleanup, NULL);
4710 /* This is cheap if the section is already read in. */
4711 dwarf2_read_section (objfile, section);
4713 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4715 abbrev_section = get_abbrev_section_for_cu (this_cu);
4717 if (use_existing_cu && this_cu->cu != NULL)
4721 /* If this CU is from a DWO file we need to start over, we need to
4722 refetch the attributes from the skeleton CU.
4723 This could be optimized by retrieving those attributes from when we
4724 were here the first time: the previous comp_unit_die was stored in
4725 comp_unit_obstack. But there's no data yet that we need this
4727 if (cu->dwo_unit != NULL)
4728 rereading_dwo_cu = 1;
4732 /* If !use_existing_cu, this_cu->cu must be NULL. */
4733 gdb_assert (this_cu->cu == NULL);
4735 cu = xmalloc (sizeof (*cu));
4736 init_one_comp_unit (cu, this_cu);
4738 /* If an error occurs while loading, release our storage. */
4739 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4742 /* Get the header. */
4743 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
4745 /* We already have the header, there's no need to read it in again. */
4746 info_ptr += cu->header.first_die_offset.cu_off;
4750 if (this_cu->is_debug_types)
4753 cu_offset type_offset_in_tu;
4755 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4756 abbrev_section, info_ptr,
4758 &type_offset_in_tu);
4760 /* Since per_cu is the first member of struct signatured_type,
4761 we can go from a pointer to one to a pointer to the other. */
4762 sig_type = (struct signatured_type *) this_cu;
4763 gdb_assert (sig_type->signature == signature);
4764 gdb_assert (sig_type->type_offset_in_tu.cu_off
4765 == type_offset_in_tu.cu_off);
4766 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4768 /* LENGTH has not been set yet for type units if we're
4769 using .gdb_index. */
4770 this_cu->length = get_cu_length (&cu->header);
4772 /* Establish the type offset that can be used to lookup the type. */
4773 sig_type->type_offset_in_section.sect_off =
4774 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
4778 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4782 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4783 gdb_assert (this_cu->length == get_cu_length (&cu->header));
4787 /* Skip dummy compilation units. */
4788 if (info_ptr >= begin_info_ptr + this_cu->length
4789 || peek_abbrev_code (abfd, info_ptr) == 0)
4791 do_cleanups (cleanups);
4795 /* If we don't have them yet, read the abbrevs for this compilation unit.
4796 And if we need to read them now, make sure they're freed when we're
4797 done. Note that it's important that if the CU had an abbrev table
4798 on entry we don't free it when we're done: Somewhere up the call stack
4799 it may be in use. */
4800 if (abbrev_table != NULL)
4802 gdb_assert (cu->abbrev_table == NULL);
4803 gdb_assert (cu->header.abbrev_offset.sect_off
4804 == abbrev_table->offset.sect_off);
4805 cu->abbrev_table = abbrev_table;
4807 else if (cu->abbrev_table == NULL)
4809 dwarf2_read_abbrevs (cu, abbrev_section);
4810 make_cleanup (dwarf2_free_abbrev_table, cu);
4812 else if (rereading_dwo_cu)
4814 dwarf2_free_abbrev_table (cu);
4815 dwarf2_read_abbrevs (cu, abbrev_section);
4818 /* Read the top level CU/TU die. */
4819 init_cu_die_reader (&reader, cu, section, NULL);
4820 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4822 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
4824 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
4825 DWO CU, that this test will fail (the attribute will not be present). */
4826 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4829 struct dwo_unit *dwo_unit;
4830 struct die_info *dwo_comp_unit_die;
4833 error (_("Dwarf Error: compilation unit with DW_AT_GNU_dwo_name"
4834 " has children (offset 0x%x) [in module %s]"),
4835 this_cu->offset.sect_off, bfd_get_filename (abfd));
4836 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
4837 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
4838 abbrev_table != NULL,
4841 &dwo_comp_unit_die, &has_children) == 0)
4844 do_cleanups (cleanups);
4847 comp_unit_die = dwo_comp_unit_die;
4850 /* All of the above is setup for this call. Yikes. */
4851 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4853 /* Done, clean up. */
4854 if (free_cu_cleanup != NULL)
4858 /* We've successfully allocated this compilation unit. Let our
4859 caller clean it up when finished with it. */
4860 discard_cleanups (free_cu_cleanup);
4862 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4863 So we have to manually free the abbrev table. */
4864 dwarf2_free_abbrev_table (cu);
4866 /* Link this CU into read_in_chain. */
4867 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4868 dwarf2_per_objfile->read_in_chain = this_cu;
4871 do_cleanups (free_cu_cleanup);
4874 do_cleanups (cleanups);
4877 /* Read CU/TU THIS_CU in section SECTION,
4878 but do not follow DW_AT_GNU_dwo_name if present.
4879 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
4880 to have already done the lookup to find the DWO/DWP file).
4882 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
4883 THIS_CU->is_debug_types, but nothing else.
4885 We fill in THIS_CU->length.
4887 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4888 linker) then DIE_READER_FUNC will not get called.
4890 THIS_CU->cu is always freed when done.
4891 This is done in order to not leave THIS_CU->cu in a state where we have
4892 to care whether it refers to the "main" CU or the DWO CU. */
4895 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
4896 struct dwarf2_section_info *abbrev_section,
4897 struct dwo_file *dwo_file,
4898 die_reader_func_ftype *die_reader_func,
4901 struct objfile *objfile = dwarf2_per_objfile->objfile;
4902 struct dwarf2_section_info *section = this_cu->section;
4903 bfd *abfd = section->asection->owner;
4904 struct dwarf2_cu cu;
4905 const gdb_byte *begin_info_ptr, *info_ptr;
4906 struct die_reader_specs reader;
4907 struct cleanup *cleanups;
4908 struct die_info *comp_unit_die;
4911 if (dwarf2_die_debug)
4912 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4913 this_cu->is_debug_types ? "type" : "comp",
4914 this_cu->offset.sect_off);
4916 gdb_assert (this_cu->cu == NULL);
4918 /* This is cheap if the section is already read in. */
4919 dwarf2_read_section (objfile, section);
4921 init_one_comp_unit (&cu, this_cu);
4923 cleanups = make_cleanup (free_stack_comp_unit, &cu);
4925 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4926 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
4927 abbrev_section, info_ptr,
4928 this_cu->is_debug_types);
4930 this_cu->length = get_cu_length (&cu.header);
4932 /* Skip dummy compilation units. */
4933 if (info_ptr >= begin_info_ptr + this_cu->length
4934 || peek_abbrev_code (abfd, info_ptr) == 0)
4936 do_cleanups (cleanups);
4940 dwarf2_read_abbrevs (&cu, abbrev_section);
4941 make_cleanup (dwarf2_free_abbrev_table, &cu);
4943 init_cu_die_reader (&reader, &cu, section, dwo_file);
4944 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4946 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4948 do_cleanups (cleanups);
4951 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
4952 does not lookup the specified DWO file.
4953 This cannot be used to read DWO files.
4955 THIS_CU->cu is always freed when done.
4956 This is done in order to not leave THIS_CU->cu in a state where we have
4957 to care whether it refers to the "main" CU or the DWO CU.
4958 We can revisit this if the data shows there's a performance issue. */
4961 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
4962 die_reader_func_ftype *die_reader_func,
4965 init_cutu_and_read_dies_no_follow (this_cu,
4966 get_abbrev_section_for_cu (this_cu),
4968 die_reader_func, data);
4971 /* Type Unit Groups.
4973 Type Unit Groups are a way to collapse the set of all TUs (type units) into
4974 a more manageable set. The grouping is done by DW_AT_stmt_list entry
4975 so that all types coming from the same compilation (.o file) are grouped
4976 together. A future step could be to put the types in the same symtab as
4977 the CU the types ultimately came from. */
4980 hash_type_unit_group (const void *item)
4982 const struct type_unit_group *tu_group = item;
4984 return hash_stmt_list_entry (&tu_group->hash);
4988 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
4990 const struct type_unit_group *lhs = item_lhs;
4991 const struct type_unit_group *rhs = item_rhs;
4993 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
4996 /* Allocate a hash table for type unit groups. */
4999 allocate_type_unit_groups_table (void)
5001 return htab_create_alloc_ex (3,
5002 hash_type_unit_group,
5005 &dwarf2_per_objfile->objfile->objfile_obstack,
5006 hashtab_obstack_allocate,
5007 dummy_obstack_deallocate);
5010 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5011 partial symtabs. We combine several TUs per psymtab to not let the size
5012 of any one psymtab grow too big. */
5013 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5014 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5016 /* Helper routine for get_type_unit_group.
5017 Create the type_unit_group object used to hold one or more TUs. */
5019 static struct type_unit_group *
5020 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5022 struct objfile *objfile = dwarf2_per_objfile->objfile;
5023 struct dwarf2_per_cu_data *per_cu;
5024 struct type_unit_group *tu_group;
5026 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5027 struct type_unit_group);
5028 per_cu = &tu_group->per_cu;
5029 per_cu->objfile = objfile;
5031 if (dwarf2_per_objfile->using_index)
5033 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5034 struct dwarf2_per_cu_quick_data);
5038 unsigned int line_offset = line_offset_struct.sect_off;
5039 struct partial_symtab *pst;
5042 /* Give the symtab a useful name for debug purposes. */
5043 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5044 name = xstrprintf ("<type_units_%d>",
5045 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5047 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5049 pst = create_partial_symtab (per_cu, name);
5055 tu_group->hash.dwo_unit = cu->dwo_unit;
5056 tu_group->hash.line_offset = line_offset_struct;
5061 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5062 STMT_LIST is a DW_AT_stmt_list attribute. */
5064 static struct type_unit_group *
5065 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5067 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5068 struct type_unit_group *tu_group;
5070 unsigned int line_offset;
5071 struct type_unit_group type_unit_group_for_lookup;
5073 if (dwarf2_per_objfile->type_unit_groups == NULL)
5075 dwarf2_per_objfile->type_unit_groups =
5076 allocate_type_unit_groups_table ();
5079 /* Do we need to create a new group, or can we use an existing one? */
5083 line_offset = DW_UNSND (stmt_list);
5084 ++tu_stats->nr_symtab_sharers;
5088 /* Ugh, no stmt_list. Rare, but we have to handle it.
5089 We can do various things here like create one group per TU or
5090 spread them over multiple groups to split up the expansion work.
5091 To avoid worst case scenarios (too many groups or too large groups)
5092 we, umm, group them in bunches. */
5093 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5094 | (tu_stats->nr_stmt_less_type_units
5095 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5096 ++tu_stats->nr_stmt_less_type_units;
5099 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5100 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5101 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5102 &type_unit_group_for_lookup, INSERT);
5106 gdb_assert (tu_group != NULL);
5110 sect_offset line_offset_struct;
5112 line_offset_struct.sect_off = line_offset;
5113 tu_group = create_type_unit_group (cu, line_offset_struct);
5115 ++tu_stats->nr_symtabs;
5121 /* Struct used to sort TUs by their abbreviation table offset. */
5123 struct tu_abbrev_offset
5125 struct signatured_type *sig_type;
5126 sect_offset abbrev_offset;
5129 /* Helper routine for build_type_unit_groups, passed to qsort. */
5132 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5134 const struct tu_abbrev_offset * const *a = ap;
5135 const struct tu_abbrev_offset * const *b = bp;
5136 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5137 unsigned int boff = (*b)->abbrev_offset.sect_off;
5139 return (aoff > boff) - (aoff < boff);
5142 /* A helper function to add a type_unit_group to a table. */
5145 add_type_unit_group_to_table (void **slot, void *datum)
5147 struct type_unit_group *tu_group = *slot;
5148 struct type_unit_group ***datap = datum;
5156 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5157 each one passing FUNC,DATA.
5159 The efficiency is because we sort TUs by the abbrev table they use and
5160 only read each abbrev table once. In one program there are 200K TUs
5161 sharing 8K abbrev tables.
5163 The main purpose of this function is to support building the
5164 dwarf2_per_objfile->type_unit_groups table.
5165 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5166 can collapse the search space by grouping them by stmt_list.
5167 The savings can be significant, in the same program from above the 200K TUs
5168 share 8K stmt_list tables.
5170 FUNC is expected to call get_type_unit_group, which will create the
5171 struct type_unit_group if necessary and add it to
5172 dwarf2_per_objfile->type_unit_groups. */
5175 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5177 struct objfile *objfile = dwarf2_per_objfile->objfile;
5178 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5179 struct cleanup *cleanups;
5180 struct abbrev_table *abbrev_table;
5181 sect_offset abbrev_offset;
5182 struct tu_abbrev_offset *sorted_by_abbrev;
5183 struct type_unit_group **iter;
5186 /* It's up to the caller to not call us multiple times. */
5187 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5189 if (dwarf2_per_objfile->n_type_units == 0)
5192 /* TUs typically share abbrev tables, and there can be way more TUs than
5193 abbrev tables. Sort by abbrev table to reduce the number of times we
5194 read each abbrev table in.
5195 Alternatives are to punt or to maintain a cache of abbrev tables.
5196 This is simpler and efficient enough for now.
5198 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5199 symtab to use). Typically TUs with the same abbrev offset have the same
5200 stmt_list value too so in practice this should work well.
5202 The basic algorithm here is:
5204 sort TUs by abbrev table
5205 for each TU with same abbrev table:
5206 read abbrev table if first user
5207 read TU top level DIE
5208 [IWBN if DWO skeletons had DW_AT_stmt_list]
5211 if (dwarf2_read_debug)
5212 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5214 /* Sort in a separate table to maintain the order of all_type_units
5215 for .gdb_index: TU indices directly index all_type_units. */
5216 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5217 dwarf2_per_objfile->n_type_units);
5218 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5220 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5222 sorted_by_abbrev[i].sig_type = sig_type;
5223 sorted_by_abbrev[i].abbrev_offset =
5224 read_abbrev_offset (sig_type->per_cu.section,
5225 sig_type->per_cu.offset);
5227 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5228 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5229 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5231 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5232 called any number of times, so we don't reset tu_stats here. */
5234 abbrev_offset.sect_off = ~(unsigned) 0;
5235 abbrev_table = NULL;
5236 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5238 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5240 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5242 /* Switch to the next abbrev table if necessary. */
5243 if (abbrev_table == NULL
5244 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5246 if (abbrev_table != NULL)
5248 abbrev_table_free (abbrev_table);
5249 /* Reset to NULL in case abbrev_table_read_table throws
5250 an error: abbrev_table_free_cleanup will get called. */
5251 abbrev_table = NULL;
5253 abbrev_offset = tu->abbrev_offset;
5255 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5257 ++tu_stats->nr_uniq_abbrev_tables;
5260 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5264 /* Create a vector of pointers to primary type units to make it easy to
5265 iterate over them and CUs. See dw2_get_primary_cu. */
5266 dwarf2_per_objfile->n_type_unit_groups =
5267 htab_elements (dwarf2_per_objfile->type_unit_groups);
5268 dwarf2_per_objfile->all_type_unit_groups =
5269 obstack_alloc (&objfile->objfile_obstack,
5270 dwarf2_per_objfile->n_type_unit_groups
5271 * sizeof (struct type_unit_group *));
5272 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5273 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5274 add_type_unit_group_to_table, &iter);
5275 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5276 == dwarf2_per_objfile->n_type_unit_groups);
5278 do_cleanups (cleanups);
5280 if (dwarf2_read_debug)
5282 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5283 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5284 dwarf2_per_objfile->n_type_units);
5285 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5286 tu_stats->nr_uniq_abbrev_tables);
5287 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5288 tu_stats->nr_symtabs);
5289 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5290 tu_stats->nr_symtab_sharers);
5291 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5292 tu_stats->nr_stmt_less_type_units);
5296 /* Partial symbol tables. */
5298 /* Create a psymtab named NAME and assign it to PER_CU.
5300 The caller must fill in the following details:
5301 dirname, textlow, texthigh. */
5303 static struct partial_symtab *
5304 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5306 struct objfile *objfile = per_cu->objfile;
5307 struct partial_symtab *pst;
5309 pst = start_psymtab_common (objfile, objfile->section_offsets,
5311 objfile->global_psymbols.next,
5312 objfile->static_psymbols.next);
5314 pst->psymtabs_addrmap_supported = 1;
5316 /* This is the glue that links PST into GDB's symbol API. */
5317 pst->read_symtab_private = per_cu;
5318 pst->read_symtab = dwarf2_read_symtab;
5319 per_cu->v.psymtab = pst;
5324 /* die_reader_func for process_psymtab_comp_unit. */
5327 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5328 const gdb_byte *info_ptr,
5329 struct die_info *comp_unit_die,
5333 struct dwarf2_cu *cu = reader->cu;
5334 struct objfile *objfile = cu->objfile;
5335 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5336 struct attribute *attr;
5338 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5339 struct partial_symtab *pst;
5341 const char *filename;
5342 int *want_partial_unit_ptr = data;
5344 if (comp_unit_die->tag == DW_TAG_partial_unit
5345 && (want_partial_unit_ptr == NULL
5346 || !*want_partial_unit_ptr))
5349 gdb_assert (! per_cu->is_debug_types);
5351 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5353 cu->list_in_scope = &file_symbols;
5355 /* Allocate a new partial symbol table structure. */
5356 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5357 if (attr == NULL || !DW_STRING (attr))
5360 filename = DW_STRING (attr);
5362 pst = create_partial_symtab (per_cu, filename);
5364 /* This must be done before calling dwarf2_build_include_psymtabs. */
5365 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5367 pst->dirname = DW_STRING (attr);
5369 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5371 dwarf2_find_base_address (comp_unit_die, cu);
5373 /* Possibly set the default values of LOWPC and HIGHPC from
5375 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5376 &best_highpc, cu, pst);
5377 if (has_pc_info == 1 && best_lowpc < best_highpc)
5378 /* Store the contiguous range if it is not empty; it can be empty for
5379 CUs with no code. */
5380 addrmap_set_empty (objfile->psymtabs_addrmap,
5381 best_lowpc + baseaddr,
5382 best_highpc + baseaddr - 1, pst);
5384 /* Check if comp unit has_children.
5385 If so, read the rest of the partial symbols from this comp unit.
5386 If not, there's no more debug_info for this comp unit. */
5389 struct partial_die_info *first_die;
5390 CORE_ADDR lowpc, highpc;
5392 lowpc = ((CORE_ADDR) -1);
5393 highpc = ((CORE_ADDR) 0);
5395 first_die = load_partial_dies (reader, info_ptr, 1);
5397 scan_partial_symbols (first_die, &lowpc, &highpc,
5400 /* If we didn't find a lowpc, set it to highpc to avoid
5401 complaints from `maint check'. */
5402 if (lowpc == ((CORE_ADDR) -1))
5405 /* If the compilation unit didn't have an explicit address range,
5406 then use the information extracted from its child dies. */
5410 best_highpc = highpc;
5413 pst->textlow = best_lowpc + baseaddr;
5414 pst->texthigh = best_highpc + baseaddr;
5416 pst->n_global_syms = objfile->global_psymbols.next -
5417 (objfile->global_psymbols.list + pst->globals_offset);
5418 pst->n_static_syms = objfile->static_psymbols.next -
5419 (objfile->static_psymbols.list + pst->statics_offset);
5420 sort_pst_symbols (objfile, pst);
5422 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5425 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5426 struct dwarf2_per_cu_data *iter;
5428 /* Fill in 'dependencies' here; we fill in 'users' in a
5430 pst->number_of_dependencies = len;
5431 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5432 len * sizeof (struct symtab *));
5434 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5437 pst->dependencies[i] = iter->v.psymtab;
5439 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5442 /* Get the list of files included in the current compilation unit,
5443 and build a psymtab for each of them. */
5444 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5446 if (dwarf2_read_debug)
5448 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5450 fprintf_unfiltered (gdb_stdlog,
5451 "Psymtab for %s unit @0x%x: %s - %s"
5452 ", %d global, %d static syms\n",
5453 per_cu->is_debug_types ? "type" : "comp",
5454 per_cu->offset.sect_off,
5455 paddress (gdbarch, pst->textlow),
5456 paddress (gdbarch, pst->texthigh),
5457 pst->n_global_syms, pst->n_static_syms);
5461 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5462 Process compilation unit THIS_CU for a psymtab. */
5465 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5466 int want_partial_unit)
5468 /* If this compilation unit was already read in, free the
5469 cached copy in order to read it in again. This is
5470 necessary because we skipped some symbols when we first
5471 read in the compilation unit (see load_partial_dies).
5472 This problem could be avoided, but the benefit is unclear. */
5473 if (this_cu->cu != NULL)
5474 free_one_cached_comp_unit (this_cu);
5476 gdb_assert (! this_cu->is_debug_types);
5477 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5478 process_psymtab_comp_unit_reader,
5479 &want_partial_unit);
5481 /* Age out any secondary CUs. */
5482 age_cached_comp_units ();
5485 /* Reader function for build_type_psymtabs. */
5488 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5489 const gdb_byte *info_ptr,
5490 struct die_info *type_unit_die,
5494 struct objfile *objfile = dwarf2_per_objfile->objfile;
5495 struct dwarf2_cu *cu = reader->cu;
5496 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5497 struct signatured_type *sig_type;
5498 struct type_unit_group *tu_group;
5499 struct attribute *attr;
5500 struct partial_die_info *first_die;
5501 CORE_ADDR lowpc, highpc;
5502 struct partial_symtab *pst;
5504 gdb_assert (data == NULL);
5505 gdb_assert (per_cu->is_debug_types);
5506 sig_type = (struct signatured_type *) per_cu;
5511 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5512 tu_group = get_type_unit_group (cu, attr);
5514 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5516 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5517 cu->list_in_scope = &file_symbols;
5518 pst = create_partial_symtab (per_cu, "");
5521 first_die = load_partial_dies (reader, info_ptr, 1);
5523 lowpc = (CORE_ADDR) -1;
5524 highpc = (CORE_ADDR) 0;
5525 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5527 pst->n_global_syms = objfile->global_psymbols.next -
5528 (objfile->global_psymbols.list + pst->globals_offset);
5529 pst->n_static_syms = objfile->static_psymbols.next -
5530 (objfile->static_psymbols.list + pst->statics_offset);
5531 sort_pst_symbols (objfile, pst);
5534 /* Traversal function for build_type_psymtabs. */
5537 build_type_psymtab_dependencies (void **slot, void *info)
5539 struct objfile *objfile = dwarf2_per_objfile->objfile;
5540 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5541 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5542 struct partial_symtab *pst = per_cu->v.psymtab;
5543 int len = VEC_length (sig_type_ptr, tu_group->tus);
5544 struct signatured_type *iter;
5547 gdb_assert (len > 0);
5548 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5550 pst->number_of_dependencies = len;
5551 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5552 len * sizeof (struct psymtab *));
5554 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5557 gdb_assert (iter->per_cu.is_debug_types);
5558 pst->dependencies[i] = iter->per_cu.v.psymtab;
5559 iter->type_unit_group = tu_group;
5562 VEC_free (sig_type_ptr, tu_group->tus);
5567 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5568 Build partial symbol tables for the .debug_types comp-units. */
5571 build_type_psymtabs (struct objfile *objfile)
5573 if (! create_all_type_units (objfile))
5576 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5578 /* Now that all TUs have been processed we can fill in the dependencies. */
5579 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5580 build_type_psymtab_dependencies, NULL);
5583 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5586 psymtabs_addrmap_cleanup (void *o)
5588 struct objfile *objfile = o;
5590 objfile->psymtabs_addrmap = NULL;
5593 /* Compute the 'user' field for each psymtab in OBJFILE. */
5596 set_partial_user (struct objfile *objfile)
5600 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5602 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5603 struct partial_symtab *pst = per_cu->v.psymtab;
5609 for (j = 0; j < pst->number_of_dependencies; ++j)
5611 /* Set the 'user' field only if it is not already set. */
5612 if (pst->dependencies[j]->user == NULL)
5613 pst->dependencies[j]->user = pst;
5618 /* Build the partial symbol table by doing a quick pass through the
5619 .debug_info and .debug_abbrev sections. */
5622 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5624 struct cleanup *back_to, *addrmap_cleanup;
5625 struct obstack temp_obstack;
5628 if (dwarf2_read_debug)
5630 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5634 dwarf2_per_objfile->reading_partial_symbols = 1;
5636 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5638 /* Any cached compilation units will be linked by the per-objfile
5639 read_in_chain. Make sure to free them when we're done. */
5640 back_to = make_cleanup (free_cached_comp_units, NULL);
5642 build_type_psymtabs (objfile);
5644 create_all_comp_units (objfile);
5646 /* Create a temporary address map on a temporary obstack. We later
5647 copy this to the final obstack. */
5648 obstack_init (&temp_obstack);
5649 make_cleanup_obstack_free (&temp_obstack);
5650 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
5651 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
5653 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5655 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5657 process_psymtab_comp_unit (per_cu, 0);
5660 set_partial_user (objfile);
5662 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
5663 &objfile->objfile_obstack);
5664 discard_cleanups (addrmap_cleanup);
5666 do_cleanups (back_to);
5668 if (dwarf2_read_debug)
5669 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
5673 /* die_reader_func for load_partial_comp_unit. */
5676 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
5677 const gdb_byte *info_ptr,
5678 struct die_info *comp_unit_die,
5682 struct dwarf2_cu *cu = reader->cu;
5684 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5686 /* Check if comp unit has_children.
5687 If so, read the rest of the partial symbols from this comp unit.
5688 If not, there's no more debug_info for this comp unit. */
5690 load_partial_dies (reader, info_ptr, 0);
5693 /* Load the partial DIEs for a secondary CU into memory.
5694 This is also used when rereading a primary CU with load_all_dies. */
5697 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
5699 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
5700 load_partial_comp_unit_reader, NULL);
5704 read_comp_units_from_section (struct objfile *objfile,
5705 struct dwarf2_section_info *section,
5706 unsigned int is_dwz,
5709 struct dwarf2_per_cu_data ***all_comp_units)
5711 const gdb_byte *info_ptr;
5712 bfd *abfd = section->asection->owner;
5714 if (dwarf2_read_debug)
5715 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
5716 section->asection->name, bfd_get_filename (abfd));
5718 dwarf2_read_section (objfile, section);
5720 info_ptr = section->buffer;
5722 while (info_ptr < section->buffer + section->size)
5724 unsigned int length, initial_length_size;
5725 struct dwarf2_per_cu_data *this_cu;
5728 offset.sect_off = info_ptr - section->buffer;
5730 /* Read just enough information to find out where the next
5731 compilation unit is. */
5732 length = read_initial_length (abfd, info_ptr, &initial_length_size);
5734 /* Save the compilation unit for later lookup. */
5735 this_cu = obstack_alloc (&objfile->objfile_obstack,
5736 sizeof (struct dwarf2_per_cu_data));
5737 memset (this_cu, 0, sizeof (*this_cu));
5738 this_cu->offset = offset;
5739 this_cu->length = length + initial_length_size;
5740 this_cu->is_dwz = is_dwz;
5741 this_cu->objfile = objfile;
5742 this_cu->section = section;
5744 if (*n_comp_units == *n_allocated)
5747 *all_comp_units = xrealloc (*all_comp_units,
5749 * sizeof (struct dwarf2_per_cu_data *));
5751 (*all_comp_units)[*n_comp_units] = this_cu;
5754 info_ptr = info_ptr + this_cu->length;
5758 /* Create a list of all compilation units in OBJFILE.
5759 This is only done for -readnow and building partial symtabs. */
5762 create_all_comp_units (struct objfile *objfile)
5766 struct dwarf2_per_cu_data **all_comp_units;
5770 all_comp_units = xmalloc (n_allocated
5771 * sizeof (struct dwarf2_per_cu_data *));
5773 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
5774 &n_allocated, &n_comp_units, &all_comp_units);
5776 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
5778 struct dwz_file *dwz = dwarf2_get_dwz_file ();
5780 read_comp_units_from_section (objfile, &dwz->info, 1,
5781 &n_allocated, &n_comp_units,
5785 dwarf2_per_objfile->all_comp_units
5786 = obstack_alloc (&objfile->objfile_obstack,
5787 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5788 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
5789 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5790 xfree (all_comp_units);
5791 dwarf2_per_objfile->n_comp_units = n_comp_units;
5794 /* Process all loaded DIEs for compilation unit CU, starting at
5795 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
5796 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
5797 DW_AT_ranges). If NEED_PC is set, then this function will set
5798 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
5799 and record the covered ranges in the addrmap. */
5802 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
5803 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
5805 struct partial_die_info *pdi;
5807 /* Now, march along the PDI's, descending into ones which have
5808 interesting children but skipping the children of the other ones,
5809 until we reach the end of the compilation unit. */
5815 fixup_partial_die (pdi, cu);
5817 /* Anonymous namespaces or modules have no name but have interesting
5818 children, so we need to look at them. Ditto for anonymous
5821 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
5822 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
5823 || pdi->tag == DW_TAG_imported_unit)
5827 case DW_TAG_subprogram:
5828 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
5830 case DW_TAG_constant:
5831 case DW_TAG_variable:
5832 case DW_TAG_typedef:
5833 case DW_TAG_union_type:
5834 if (!pdi->is_declaration)
5836 add_partial_symbol (pdi, cu);
5839 case DW_TAG_class_type:
5840 case DW_TAG_interface_type:
5841 case DW_TAG_structure_type:
5842 if (!pdi->is_declaration)
5844 add_partial_symbol (pdi, cu);
5847 case DW_TAG_enumeration_type:
5848 if (!pdi->is_declaration)
5849 add_partial_enumeration (pdi, cu);
5851 case DW_TAG_base_type:
5852 case DW_TAG_subrange_type:
5853 /* File scope base type definitions are added to the partial
5855 add_partial_symbol (pdi, cu);
5857 case DW_TAG_namespace:
5858 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
5861 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
5863 case DW_TAG_imported_unit:
5865 struct dwarf2_per_cu_data *per_cu;
5867 /* For now we don't handle imported units in type units. */
5868 if (cu->per_cu->is_debug_types)
5870 error (_("Dwarf Error: DW_TAG_imported_unit is not"
5871 " supported in type units [in module %s]"),
5875 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
5879 /* Go read the partial unit, if needed. */
5880 if (per_cu->v.psymtab == NULL)
5881 process_psymtab_comp_unit (per_cu, 1);
5883 VEC_safe_push (dwarf2_per_cu_ptr,
5884 cu->per_cu->imported_symtabs, per_cu);
5892 /* If the die has a sibling, skip to the sibling. */
5894 pdi = pdi->die_sibling;
5898 /* Functions used to compute the fully scoped name of a partial DIE.
5900 Normally, this is simple. For C++, the parent DIE's fully scoped
5901 name is concatenated with "::" and the partial DIE's name. For
5902 Java, the same thing occurs except that "." is used instead of "::".
5903 Enumerators are an exception; they use the scope of their parent
5904 enumeration type, i.e. the name of the enumeration type is not
5905 prepended to the enumerator.
5907 There are two complexities. One is DW_AT_specification; in this
5908 case "parent" means the parent of the target of the specification,
5909 instead of the direct parent of the DIE. The other is compilers
5910 which do not emit DW_TAG_namespace; in this case we try to guess
5911 the fully qualified name of structure types from their members'
5912 linkage names. This must be done using the DIE's children rather
5913 than the children of any DW_AT_specification target. We only need
5914 to do this for structures at the top level, i.e. if the target of
5915 any DW_AT_specification (if any; otherwise the DIE itself) does not
5918 /* Compute the scope prefix associated with PDI's parent, in
5919 compilation unit CU. The result will be allocated on CU's
5920 comp_unit_obstack, or a copy of the already allocated PDI->NAME
5921 field. NULL is returned if no prefix is necessary. */
5923 partial_die_parent_scope (struct partial_die_info *pdi,
5924 struct dwarf2_cu *cu)
5926 const char *grandparent_scope;
5927 struct partial_die_info *parent, *real_pdi;
5929 /* We need to look at our parent DIE; if we have a DW_AT_specification,
5930 then this means the parent of the specification DIE. */
5933 while (real_pdi->has_specification)
5934 real_pdi = find_partial_die (real_pdi->spec_offset,
5935 real_pdi->spec_is_dwz, cu);
5937 parent = real_pdi->die_parent;
5941 if (parent->scope_set)
5942 return parent->scope;
5944 fixup_partial_die (parent, cu);
5946 grandparent_scope = partial_die_parent_scope (parent, cu);
5948 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
5949 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
5950 Work around this problem here. */
5951 if (cu->language == language_cplus
5952 && parent->tag == DW_TAG_namespace
5953 && strcmp (parent->name, "::") == 0
5954 && grandparent_scope == NULL)
5956 parent->scope = NULL;
5957 parent->scope_set = 1;
5961 if (pdi->tag == DW_TAG_enumerator)
5962 /* Enumerators should not get the name of the enumeration as a prefix. */
5963 parent->scope = grandparent_scope;
5964 else if (parent->tag == DW_TAG_namespace
5965 || parent->tag == DW_TAG_module
5966 || parent->tag == DW_TAG_structure_type
5967 || parent->tag == DW_TAG_class_type
5968 || parent->tag == DW_TAG_interface_type
5969 || parent->tag == DW_TAG_union_type
5970 || parent->tag == DW_TAG_enumeration_type)
5972 if (grandparent_scope == NULL)
5973 parent->scope = parent->name;
5975 parent->scope = typename_concat (&cu->comp_unit_obstack,
5977 parent->name, 0, cu);
5981 /* FIXME drow/2004-04-01: What should we be doing with
5982 function-local names? For partial symbols, we should probably be
5984 complaint (&symfile_complaints,
5985 _("unhandled containing DIE tag %d for DIE at %d"),
5986 parent->tag, pdi->offset.sect_off);
5987 parent->scope = grandparent_scope;
5990 parent->scope_set = 1;
5991 return parent->scope;
5994 /* Return the fully scoped name associated with PDI, from compilation unit
5995 CU. The result will be allocated with malloc. */
5998 partial_die_full_name (struct partial_die_info *pdi,
5999 struct dwarf2_cu *cu)
6001 const char *parent_scope;
6003 /* If this is a template instantiation, we can not work out the
6004 template arguments from partial DIEs. So, unfortunately, we have
6005 to go through the full DIEs. At least any work we do building
6006 types here will be reused if full symbols are loaded later. */
6007 if (pdi->has_template_arguments)
6009 fixup_partial_die (pdi, cu);
6011 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6013 struct die_info *die;
6014 struct attribute attr;
6015 struct dwarf2_cu *ref_cu = cu;
6017 /* DW_FORM_ref_addr is using section offset. */
6019 attr.form = DW_FORM_ref_addr;
6020 attr.u.unsnd = pdi->offset.sect_off;
6021 die = follow_die_ref (NULL, &attr, &ref_cu);
6023 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6027 parent_scope = partial_die_parent_scope (pdi, cu);
6028 if (parent_scope == NULL)
6031 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6035 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6037 struct objfile *objfile = cu->objfile;
6039 const char *actual_name = NULL;
6041 char *built_actual_name;
6043 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6045 built_actual_name = partial_die_full_name (pdi, cu);
6046 if (built_actual_name != NULL)
6047 actual_name = built_actual_name;
6049 if (actual_name == NULL)
6050 actual_name = pdi->name;
6054 case DW_TAG_subprogram:
6055 if (pdi->is_external || cu->language == language_ada)
6057 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6058 of the global scope. But in Ada, we want to be able to access
6059 nested procedures globally. So all Ada subprograms are stored
6060 in the global scope. */
6061 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6062 mst_text, objfile); */
6063 add_psymbol_to_list (actual_name, strlen (actual_name),
6064 built_actual_name != NULL,
6065 VAR_DOMAIN, LOC_BLOCK,
6066 &objfile->global_psymbols,
6067 0, pdi->lowpc + baseaddr,
6068 cu->language, objfile);
6072 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6073 mst_file_text, objfile); */
6074 add_psymbol_to_list (actual_name, strlen (actual_name),
6075 built_actual_name != NULL,
6076 VAR_DOMAIN, LOC_BLOCK,
6077 &objfile->static_psymbols,
6078 0, pdi->lowpc + baseaddr,
6079 cu->language, objfile);
6082 case DW_TAG_constant:
6084 struct psymbol_allocation_list *list;
6086 if (pdi->is_external)
6087 list = &objfile->global_psymbols;
6089 list = &objfile->static_psymbols;
6090 add_psymbol_to_list (actual_name, strlen (actual_name),
6091 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6092 list, 0, 0, cu->language, objfile);
6095 case DW_TAG_variable:
6097 addr = decode_locdesc (pdi->d.locdesc, cu);
6101 && !dwarf2_per_objfile->has_section_at_zero)
6103 /* A global or static variable may also have been stripped
6104 out by the linker if unused, in which case its address
6105 will be nullified; do not add such variables into partial
6106 symbol table then. */
6108 else if (pdi->is_external)
6111 Don't enter into the minimal symbol tables as there is
6112 a minimal symbol table entry from the ELF symbols already.
6113 Enter into partial symbol table if it has a location
6114 descriptor or a type.
6115 If the location descriptor is missing, new_symbol will create
6116 a LOC_UNRESOLVED symbol, the address of the variable will then
6117 be determined from the minimal symbol table whenever the variable
6119 The address for the partial symbol table entry is not
6120 used by GDB, but it comes in handy for debugging partial symbol
6123 if (pdi->d.locdesc || pdi->has_type)
6124 add_psymbol_to_list (actual_name, strlen (actual_name),
6125 built_actual_name != NULL,
6126 VAR_DOMAIN, LOC_STATIC,
6127 &objfile->global_psymbols,
6129 cu->language, objfile);
6133 /* Static Variable. Skip symbols without location descriptors. */
6134 if (pdi->d.locdesc == NULL)
6136 xfree (built_actual_name);
6139 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6140 mst_file_data, objfile); */
6141 add_psymbol_to_list (actual_name, strlen (actual_name),
6142 built_actual_name != NULL,
6143 VAR_DOMAIN, LOC_STATIC,
6144 &objfile->static_psymbols,
6146 cu->language, objfile);
6149 case DW_TAG_typedef:
6150 case DW_TAG_base_type:
6151 case DW_TAG_subrange_type:
6152 add_psymbol_to_list (actual_name, strlen (actual_name),
6153 built_actual_name != NULL,
6154 VAR_DOMAIN, LOC_TYPEDEF,
6155 &objfile->static_psymbols,
6156 0, (CORE_ADDR) 0, cu->language, objfile);
6158 case DW_TAG_namespace:
6159 add_psymbol_to_list (actual_name, strlen (actual_name),
6160 built_actual_name != NULL,
6161 VAR_DOMAIN, LOC_TYPEDEF,
6162 &objfile->global_psymbols,
6163 0, (CORE_ADDR) 0, cu->language, objfile);
6165 case DW_TAG_class_type:
6166 case DW_TAG_interface_type:
6167 case DW_TAG_structure_type:
6168 case DW_TAG_union_type:
6169 case DW_TAG_enumeration_type:
6170 /* Skip external references. The DWARF standard says in the section
6171 about "Structure, Union, and Class Type Entries": "An incomplete
6172 structure, union or class type is represented by a structure,
6173 union or class entry that does not have a byte size attribute
6174 and that has a DW_AT_declaration attribute." */
6175 if (!pdi->has_byte_size && pdi->is_declaration)
6177 xfree (built_actual_name);
6181 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6182 static vs. global. */
6183 add_psymbol_to_list (actual_name, strlen (actual_name),
6184 built_actual_name != NULL,
6185 STRUCT_DOMAIN, LOC_TYPEDEF,
6186 (cu->language == language_cplus
6187 || cu->language == language_java)
6188 ? &objfile->global_psymbols
6189 : &objfile->static_psymbols,
6190 0, (CORE_ADDR) 0, cu->language, objfile);
6193 case DW_TAG_enumerator:
6194 add_psymbol_to_list (actual_name, strlen (actual_name),
6195 built_actual_name != NULL,
6196 VAR_DOMAIN, LOC_CONST,
6197 (cu->language == language_cplus
6198 || cu->language == language_java)
6199 ? &objfile->global_psymbols
6200 : &objfile->static_psymbols,
6201 0, (CORE_ADDR) 0, cu->language, objfile);
6207 xfree (built_actual_name);
6210 /* Read a partial die corresponding to a namespace; also, add a symbol
6211 corresponding to that namespace to the symbol table. NAMESPACE is
6212 the name of the enclosing namespace. */
6215 add_partial_namespace (struct partial_die_info *pdi,
6216 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6217 int need_pc, struct dwarf2_cu *cu)
6219 /* Add a symbol for the namespace. */
6221 add_partial_symbol (pdi, cu);
6223 /* Now scan partial symbols in that namespace. */
6225 if (pdi->has_children)
6226 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6229 /* Read a partial die corresponding to a Fortran module. */
6232 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6233 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6235 /* Now scan partial symbols in that module. */
6237 if (pdi->has_children)
6238 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6241 /* Read a partial die corresponding to a subprogram and create a partial
6242 symbol for that subprogram. When the CU language allows it, this
6243 routine also defines a partial symbol for each nested subprogram
6244 that this subprogram contains.
6246 DIE my also be a lexical block, in which case we simply search
6247 recursively for suprograms defined inside that lexical block.
6248 Again, this is only performed when the CU language allows this
6249 type of definitions. */
6252 add_partial_subprogram (struct partial_die_info *pdi,
6253 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6254 int need_pc, struct dwarf2_cu *cu)
6256 if (pdi->tag == DW_TAG_subprogram)
6258 if (pdi->has_pc_info)
6260 if (pdi->lowpc < *lowpc)
6261 *lowpc = pdi->lowpc;
6262 if (pdi->highpc > *highpc)
6263 *highpc = pdi->highpc;
6267 struct objfile *objfile = cu->objfile;
6269 baseaddr = ANOFFSET (objfile->section_offsets,
6270 SECT_OFF_TEXT (objfile));
6271 addrmap_set_empty (objfile->psymtabs_addrmap,
6272 pdi->lowpc + baseaddr,
6273 pdi->highpc - 1 + baseaddr,
6274 cu->per_cu->v.psymtab);
6278 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6280 if (!pdi->is_declaration)
6281 /* Ignore subprogram DIEs that do not have a name, they are
6282 illegal. Do not emit a complaint at this point, we will
6283 do so when we convert this psymtab into a symtab. */
6285 add_partial_symbol (pdi, cu);
6289 if (! pdi->has_children)
6292 if (cu->language == language_ada)
6294 pdi = pdi->die_child;
6297 fixup_partial_die (pdi, cu);
6298 if (pdi->tag == DW_TAG_subprogram
6299 || pdi->tag == DW_TAG_lexical_block)
6300 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6301 pdi = pdi->die_sibling;
6306 /* Read a partial die corresponding to an enumeration type. */
6309 add_partial_enumeration (struct partial_die_info *enum_pdi,
6310 struct dwarf2_cu *cu)
6312 struct partial_die_info *pdi;
6314 if (enum_pdi->name != NULL)
6315 add_partial_symbol (enum_pdi, cu);
6317 pdi = enum_pdi->die_child;
6320 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6321 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6323 add_partial_symbol (pdi, cu);
6324 pdi = pdi->die_sibling;
6328 /* Return the initial uleb128 in the die at INFO_PTR. */
6331 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6333 unsigned int bytes_read;
6335 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6338 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6339 Return the corresponding abbrev, or NULL if the number is zero (indicating
6340 an empty DIE). In either case *BYTES_READ will be set to the length of
6341 the initial number. */
6343 static struct abbrev_info *
6344 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6345 struct dwarf2_cu *cu)
6347 bfd *abfd = cu->objfile->obfd;
6348 unsigned int abbrev_number;
6349 struct abbrev_info *abbrev;
6351 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6353 if (abbrev_number == 0)
6356 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6359 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6360 abbrev_number, bfd_get_filename (abfd));
6366 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6367 Returns a pointer to the end of a series of DIEs, terminated by an empty
6368 DIE. Any children of the skipped DIEs will also be skipped. */
6370 static const gdb_byte *
6371 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6373 struct dwarf2_cu *cu = reader->cu;
6374 struct abbrev_info *abbrev;
6375 unsigned int bytes_read;
6379 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6381 return info_ptr + bytes_read;
6383 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6387 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6388 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6389 abbrev corresponding to that skipped uleb128 should be passed in
6390 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6393 static const gdb_byte *
6394 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6395 struct abbrev_info *abbrev)
6397 unsigned int bytes_read;
6398 struct attribute attr;
6399 bfd *abfd = reader->abfd;
6400 struct dwarf2_cu *cu = reader->cu;
6401 const gdb_byte *buffer = reader->buffer;
6402 const gdb_byte *buffer_end = reader->buffer_end;
6403 const gdb_byte *start_info_ptr = info_ptr;
6404 unsigned int form, i;
6406 for (i = 0; i < abbrev->num_attrs; i++)
6408 /* The only abbrev we care about is DW_AT_sibling. */
6409 if (abbrev->attrs[i].name == DW_AT_sibling)
6411 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6412 if (attr.form == DW_FORM_ref_addr)
6413 complaint (&symfile_complaints,
6414 _("ignoring absolute DW_AT_sibling"));
6416 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6419 /* If it isn't DW_AT_sibling, skip this attribute. */
6420 form = abbrev->attrs[i].form;
6424 case DW_FORM_ref_addr:
6425 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6426 and later it is offset sized. */
6427 if (cu->header.version == 2)
6428 info_ptr += cu->header.addr_size;
6430 info_ptr += cu->header.offset_size;
6432 case DW_FORM_GNU_ref_alt:
6433 info_ptr += cu->header.offset_size;
6436 info_ptr += cu->header.addr_size;
6443 case DW_FORM_flag_present:
6455 case DW_FORM_ref_sig8:
6458 case DW_FORM_string:
6459 read_direct_string (abfd, info_ptr, &bytes_read);
6460 info_ptr += bytes_read;
6462 case DW_FORM_sec_offset:
6464 case DW_FORM_GNU_strp_alt:
6465 info_ptr += cu->header.offset_size;
6467 case DW_FORM_exprloc:
6469 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6470 info_ptr += bytes_read;
6472 case DW_FORM_block1:
6473 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6475 case DW_FORM_block2:
6476 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6478 case DW_FORM_block4:
6479 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6483 case DW_FORM_ref_udata:
6484 case DW_FORM_GNU_addr_index:
6485 case DW_FORM_GNU_str_index:
6486 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6488 case DW_FORM_indirect:
6489 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6490 info_ptr += bytes_read;
6491 /* We need to continue parsing from here, so just go back to
6493 goto skip_attribute;
6496 error (_("Dwarf Error: Cannot handle %s "
6497 "in DWARF reader [in module %s]"),
6498 dwarf_form_name (form),
6499 bfd_get_filename (abfd));
6503 if (abbrev->has_children)
6504 return skip_children (reader, info_ptr);
6509 /* Locate ORIG_PDI's sibling.
6510 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6512 static const gdb_byte *
6513 locate_pdi_sibling (const struct die_reader_specs *reader,
6514 struct partial_die_info *orig_pdi,
6515 const gdb_byte *info_ptr)
6517 /* Do we know the sibling already? */
6519 if (orig_pdi->sibling)
6520 return orig_pdi->sibling;
6522 /* Are there any children to deal with? */
6524 if (!orig_pdi->has_children)
6527 /* Skip the children the long way. */
6529 return skip_children (reader, info_ptr);
6532 /* Expand this partial symbol table into a full symbol table. SELF is
6536 dwarf2_read_symtab (struct partial_symtab *self,
6537 struct objfile *objfile)
6541 warning (_("bug: psymtab for %s is already read in."),
6548 printf_filtered (_("Reading in symbols for %s..."),
6550 gdb_flush (gdb_stdout);
6553 /* Restore our global data. */
6554 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6556 /* If this psymtab is constructed from a debug-only objfile, the
6557 has_section_at_zero flag will not necessarily be correct. We
6558 can get the correct value for this flag by looking at the data
6559 associated with the (presumably stripped) associated objfile. */
6560 if (objfile->separate_debug_objfile_backlink)
6562 struct dwarf2_per_objfile *dpo_backlink
6563 = objfile_data (objfile->separate_debug_objfile_backlink,
6564 dwarf2_objfile_data_key);
6566 dwarf2_per_objfile->has_section_at_zero
6567 = dpo_backlink->has_section_at_zero;
6570 dwarf2_per_objfile->reading_partial_symbols = 0;
6572 psymtab_to_symtab_1 (self);
6574 /* Finish up the debug error message. */
6576 printf_filtered (_("done.\n"));
6579 process_cu_includes ();
6582 /* Reading in full CUs. */
6584 /* Add PER_CU to the queue. */
6587 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6588 enum language pretend_language)
6590 struct dwarf2_queue_item *item;
6593 item = xmalloc (sizeof (*item));
6594 item->per_cu = per_cu;
6595 item->pretend_language = pretend_language;
6598 if (dwarf2_queue == NULL)
6599 dwarf2_queue = item;
6601 dwarf2_queue_tail->next = item;
6603 dwarf2_queue_tail = item;
6606 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6607 unit and add it to our queue.
6608 The result is non-zero if PER_CU was queued, otherwise the result is zero
6609 meaning either PER_CU is already queued or it is already loaded. */
6612 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6613 struct dwarf2_per_cu_data *per_cu,
6614 enum language pretend_language)
6616 /* We may arrive here during partial symbol reading, if we need full
6617 DIEs to process an unusual case (e.g. template arguments). Do
6618 not queue PER_CU, just tell our caller to load its DIEs. */
6619 if (dwarf2_per_objfile->reading_partial_symbols)
6621 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6626 /* Mark the dependence relation so that we don't flush PER_CU
6628 dwarf2_add_dependence (this_cu, per_cu);
6630 /* If it's already on the queue, we have nothing to do. */
6634 /* If the compilation unit is already loaded, just mark it as
6636 if (per_cu->cu != NULL)
6638 per_cu->cu->last_used = 0;
6642 /* Add it to the queue. */
6643 queue_comp_unit (per_cu, pretend_language);
6648 /* Process the queue. */
6651 process_queue (void)
6653 struct dwarf2_queue_item *item, *next_item;
6655 if (dwarf2_read_debug)
6657 fprintf_unfiltered (gdb_stdlog,
6658 "Expanding one or more symtabs of objfile %s ...\n",
6659 dwarf2_per_objfile->objfile->name);
6662 /* The queue starts out with one item, but following a DIE reference
6663 may load a new CU, adding it to the end of the queue. */
6664 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
6666 if (dwarf2_per_objfile->using_index
6667 ? !item->per_cu->v.quick->symtab
6668 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
6670 struct dwarf2_per_cu_data *per_cu = item->per_cu;
6672 if (dwarf2_read_debug)
6674 fprintf_unfiltered (gdb_stdlog,
6675 "Expanding symtab of %s at offset 0x%x\n",
6676 per_cu->is_debug_types ? "TU" : "CU",
6677 per_cu->offset.sect_off);
6680 if (per_cu->is_debug_types)
6681 process_full_type_unit (per_cu, item->pretend_language);
6683 process_full_comp_unit (per_cu, item->pretend_language);
6685 if (dwarf2_read_debug)
6687 fprintf_unfiltered (gdb_stdlog,
6688 "Done expanding %s at offset 0x%x\n",
6689 per_cu->is_debug_types ? "TU" : "CU",
6690 per_cu->offset.sect_off);
6694 item->per_cu->queued = 0;
6695 next_item = item->next;
6699 dwarf2_queue_tail = NULL;
6701 if (dwarf2_read_debug)
6703 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
6704 dwarf2_per_objfile->objfile->name);
6708 /* Free all allocated queue entries. This function only releases anything if
6709 an error was thrown; if the queue was processed then it would have been
6710 freed as we went along. */
6713 dwarf2_release_queue (void *dummy)
6715 struct dwarf2_queue_item *item, *last;
6717 item = dwarf2_queue;
6720 /* Anything still marked queued is likely to be in an
6721 inconsistent state, so discard it. */
6722 if (item->per_cu->queued)
6724 if (item->per_cu->cu != NULL)
6725 free_one_cached_comp_unit (item->per_cu);
6726 item->per_cu->queued = 0;
6734 dwarf2_queue = dwarf2_queue_tail = NULL;
6737 /* Read in full symbols for PST, and anything it depends on. */
6740 psymtab_to_symtab_1 (struct partial_symtab *pst)
6742 struct dwarf2_per_cu_data *per_cu;
6748 for (i = 0; i < pst->number_of_dependencies; i++)
6749 if (!pst->dependencies[i]->readin
6750 && pst->dependencies[i]->user == NULL)
6752 /* Inform about additional files that need to be read in. */
6755 /* FIXME: i18n: Need to make this a single string. */
6756 fputs_filtered (" ", gdb_stdout);
6758 fputs_filtered ("and ", gdb_stdout);
6760 printf_filtered ("%s...", pst->dependencies[i]->filename);
6761 wrap_here (""); /* Flush output. */
6762 gdb_flush (gdb_stdout);
6764 psymtab_to_symtab_1 (pst->dependencies[i]);
6767 per_cu = pst->read_symtab_private;
6771 /* It's an include file, no symbols to read for it.
6772 Everything is in the parent symtab. */
6777 dw2_do_instantiate_symtab (per_cu);
6780 /* Trivial hash function for die_info: the hash value of a DIE
6781 is its offset in .debug_info for this objfile. */
6784 die_hash (const void *item)
6786 const struct die_info *die = item;
6788 return die->offset.sect_off;
6791 /* Trivial comparison function for die_info structures: two DIEs
6792 are equal if they have the same offset. */
6795 die_eq (const void *item_lhs, const void *item_rhs)
6797 const struct die_info *die_lhs = item_lhs;
6798 const struct die_info *die_rhs = item_rhs;
6800 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
6803 /* die_reader_func for load_full_comp_unit.
6804 This is identical to read_signatured_type_reader,
6805 but is kept separate for now. */
6808 load_full_comp_unit_reader (const struct die_reader_specs *reader,
6809 const gdb_byte *info_ptr,
6810 struct die_info *comp_unit_die,
6814 struct dwarf2_cu *cu = reader->cu;
6815 enum language *language_ptr = data;
6817 gdb_assert (cu->die_hash == NULL);
6819 htab_create_alloc_ex (cu->header.length / 12,
6823 &cu->comp_unit_obstack,
6824 hashtab_obstack_allocate,
6825 dummy_obstack_deallocate);
6828 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
6829 &info_ptr, comp_unit_die);
6830 cu->dies = comp_unit_die;
6831 /* comp_unit_die is not stored in die_hash, no need. */
6833 /* We try not to read any attributes in this function, because not
6834 all CUs needed for references have been loaded yet, and symbol
6835 table processing isn't initialized. But we have to set the CU language,
6836 or we won't be able to build types correctly.
6837 Similarly, if we do not read the producer, we can not apply
6838 producer-specific interpretation. */
6839 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
6842 /* Load the DIEs associated with PER_CU into memory. */
6845 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
6846 enum language pretend_language)
6848 gdb_assert (! this_cu->is_debug_types);
6850 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6851 load_full_comp_unit_reader, &pretend_language);
6854 /* Add a DIE to the delayed physname list. */
6857 add_to_method_list (struct type *type, int fnfield_index, int index,
6858 const char *name, struct die_info *die,
6859 struct dwarf2_cu *cu)
6861 struct delayed_method_info mi;
6863 mi.fnfield_index = fnfield_index;
6867 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
6870 /* A cleanup for freeing the delayed method list. */
6873 free_delayed_list (void *ptr)
6875 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
6876 if (cu->method_list != NULL)
6878 VEC_free (delayed_method_info, cu->method_list);
6879 cu->method_list = NULL;
6883 /* Compute the physnames of any methods on the CU's method list.
6885 The computation of method physnames is delayed in order to avoid the
6886 (bad) condition that one of the method's formal parameters is of an as yet
6890 compute_delayed_physnames (struct dwarf2_cu *cu)
6893 struct delayed_method_info *mi;
6894 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
6896 const char *physname;
6897 struct fn_fieldlist *fn_flp
6898 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
6899 physname = dwarf2_physname (mi->name, mi->die, cu);
6900 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
6904 /* Go objects should be embedded in a DW_TAG_module DIE,
6905 and it's not clear if/how imported objects will appear.
6906 To keep Go support simple until that's worked out,
6907 go back through what we've read and create something usable.
6908 We could do this while processing each DIE, and feels kinda cleaner,
6909 but that way is more invasive.
6910 This is to, for example, allow the user to type "p var" or "b main"
6911 without having to specify the package name, and allow lookups
6912 of module.object to work in contexts that use the expression
6916 fixup_go_packaging (struct dwarf2_cu *cu)
6918 char *package_name = NULL;
6919 struct pending *list;
6922 for (list = global_symbols; list != NULL; list = list->next)
6924 for (i = 0; i < list->nsyms; ++i)
6926 struct symbol *sym = list->symbol[i];
6928 if (SYMBOL_LANGUAGE (sym) == language_go
6929 && SYMBOL_CLASS (sym) == LOC_BLOCK)
6931 char *this_package_name = go_symbol_package_name (sym);
6933 if (this_package_name == NULL)
6935 if (package_name == NULL)
6936 package_name = this_package_name;
6939 if (strcmp (package_name, this_package_name) != 0)
6940 complaint (&symfile_complaints,
6941 _("Symtab %s has objects from two different Go packages: %s and %s"),
6942 (SYMBOL_SYMTAB (sym)
6943 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
6944 : cu->objfile->name),
6945 this_package_name, package_name);
6946 xfree (this_package_name);
6952 if (package_name != NULL)
6954 struct objfile *objfile = cu->objfile;
6955 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
6957 strlen (package_name));
6958 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
6959 saved_package_name, objfile);
6962 TYPE_TAG_NAME (type) = TYPE_NAME (type);
6964 sym = allocate_symbol (objfile);
6965 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
6966 SYMBOL_SET_NAMES (sym, saved_package_name,
6967 strlen (saved_package_name), 0, objfile);
6968 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
6969 e.g., "main" finds the "main" module and not C's main(). */
6970 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
6971 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
6972 SYMBOL_TYPE (sym) = type;
6974 add_symbol_to_list (sym, &global_symbols);
6976 xfree (package_name);
6980 /* Return the symtab for PER_CU. This works properly regardless of
6981 whether we're using the index or psymtabs. */
6983 static struct symtab *
6984 get_symtab (struct dwarf2_per_cu_data *per_cu)
6986 return (dwarf2_per_objfile->using_index
6987 ? per_cu->v.quick->symtab
6988 : per_cu->v.psymtab->symtab);
6991 /* A helper function for computing the list of all symbol tables
6992 included by PER_CU. */
6995 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
6996 htab_t all_children,
6997 struct dwarf2_per_cu_data *per_cu)
7001 struct dwarf2_per_cu_data *iter;
7003 slot = htab_find_slot (all_children, per_cu, INSERT);
7006 /* This inclusion and its children have been processed. */
7011 /* Only add a CU if it has a symbol table. */
7012 if (get_symtab (per_cu) != NULL)
7013 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
7016 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7018 recursively_compute_inclusions (result, all_children, iter);
7021 /* Compute the symtab 'includes' fields for the symtab related to
7025 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7027 gdb_assert (! per_cu->is_debug_types);
7029 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7032 struct dwarf2_per_cu_data *iter;
7033 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
7034 htab_t all_children;
7035 struct symtab *symtab = get_symtab (per_cu);
7037 /* If we don't have a symtab, we can just skip this case. */
7041 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7042 NULL, xcalloc, xfree);
7045 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7048 recursively_compute_inclusions (&result_children, all_children, iter);
7050 /* Now we have a transitive closure of all the included CUs, and
7051 for .gdb_index version 7 the included TUs, so we can convert it
7052 to a list of symtabs. */
7053 len = VEC_length (dwarf2_per_cu_ptr, result_children);
7055 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7056 (len + 1) * sizeof (struct symtab *));
7058 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
7060 symtab->includes[ix] = get_symtab (iter);
7061 symtab->includes[len] = NULL;
7063 VEC_free (dwarf2_per_cu_ptr, result_children);
7064 htab_delete (all_children);
7068 /* Compute the 'includes' field for the symtabs of all the CUs we just
7072 process_cu_includes (void)
7075 struct dwarf2_per_cu_data *iter;
7078 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7082 if (! iter->is_debug_types)
7083 compute_symtab_includes (iter);
7086 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7089 /* Generate full symbol information for PER_CU, whose DIEs have
7090 already been loaded into memory. */
7093 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7094 enum language pretend_language)
7096 struct dwarf2_cu *cu = per_cu->cu;
7097 struct objfile *objfile = per_cu->objfile;
7098 CORE_ADDR lowpc, highpc;
7099 struct symtab *symtab;
7100 struct cleanup *back_to, *delayed_list_cleanup;
7102 struct block *static_block;
7104 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7107 back_to = make_cleanup (really_free_pendings, NULL);
7108 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7110 cu->list_in_scope = &file_symbols;
7112 cu->language = pretend_language;
7113 cu->language_defn = language_def (cu->language);
7115 /* Do line number decoding in read_file_scope () */
7116 process_die (cu->dies, cu);
7118 /* For now fudge the Go package. */
7119 if (cu->language == language_go)
7120 fixup_go_packaging (cu);
7122 /* Now that we have processed all the DIEs in the CU, all the types
7123 should be complete, and it should now be safe to compute all of the
7125 compute_delayed_physnames (cu);
7126 do_cleanups (delayed_list_cleanup);
7128 /* Some compilers don't define a DW_AT_high_pc attribute for the
7129 compilation unit. If the DW_AT_high_pc is missing, synthesize
7130 it, by scanning the DIE's below the compilation unit. */
7131 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7134 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0,
7135 per_cu->imported_symtabs != NULL);
7137 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7138 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7139 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7140 addrmap to help ensure it has an accurate map of pc values belonging to
7142 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7144 symtab = end_symtab_from_static_block (static_block, objfile,
7145 SECT_OFF_TEXT (objfile), 0);
7149 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7151 /* Set symtab language to language from DW_AT_language. If the
7152 compilation is from a C file generated by language preprocessors, do
7153 not set the language if it was already deduced by start_subfile. */
7154 if (!(cu->language == language_c && symtab->language != language_c))
7155 symtab->language = cu->language;
7157 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7158 produce DW_AT_location with location lists but it can be possibly
7159 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7160 there were bugs in prologue debug info, fixed later in GCC-4.5
7161 by "unwind info for epilogues" patch (which is not directly related).
7163 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7164 needed, it would be wrong due to missing DW_AT_producer there.
7166 Still one can confuse GDB by using non-standard GCC compilation
7167 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7169 if (cu->has_loclist && gcc_4_minor >= 5)
7170 symtab->locations_valid = 1;
7172 if (gcc_4_minor >= 5)
7173 symtab->epilogue_unwind_valid = 1;
7175 symtab->call_site_htab = cu->call_site_htab;
7178 if (dwarf2_per_objfile->using_index)
7179 per_cu->v.quick->symtab = symtab;
7182 struct partial_symtab *pst = per_cu->v.psymtab;
7183 pst->symtab = symtab;
7187 /* Push it for inclusion processing later. */
7188 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7190 do_cleanups (back_to);
7193 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7194 already been loaded into memory. */
7197 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7198 enum language pretend_language)
7200 struct dwarf2_cu *cu = per_cu->cu;
7201 struct objfile *objfile = per_cu->objfile;
7202 struct symtab *symtab;
7203 struct cleanup *back_to, *delayed_list_cleanup;
7204 struct signatured_type *sig_type;
7206 gdb_assert (per_cu->is_debug_types);
7207 sig_type = (struct signatured_type *) per_cu;
7210 back_to = make_cleanup (really_free_pendings, NULL);
7211 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7213 cu->list_in_scope = &file_symbols;
7215 cu->language = pretend_language;
7216 cu->language_defn = language_def (cu->language);
7218 /* The symbol tables are set up in read_type_unit_scope. */
7219 process_die (cu->dies, cu);
7221 /* For now fudge the Go package. */
7222 if (cu->language == language_go)
7223 fixup_go_packaging (cu);
7225 /* Now that we have processed all the DIEs in the CU, all the types
7226 should be complete, and it should now be safe to compute all of the
7228 compute_delayed_physnames (cu);
7229 do_cleanups (delayed_list_cleanup);
7231 /* TUs share symbol tables.
7232 If this is the first TU to use this symtab, complete the construction
7233 of it with end_expandable_symtab. Otherwise, complete the addition of
7234 this TU's symbols to the existing symtab. */
7235 if (sig_type->type_unit_group->primary_symtab == NULL)
7237 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7238 sig_type->type_unit_group->primary_symtab = symtab;
7242 /* Set symtab language to language from DW_AT_language. If the
7243 compilation is from a C file generated by language preprocessors,
7244 do not set the language if it was already deduced by
7246 if (!(cu->language == language_c && symtab->language != language_c))
7247 symtab->language = cu->language;
7252 augment_type_symtab (objfile,
7253 sig_type->type_unit_group->primary_symtab);
7254 symtab = sig_type->type_unit_group->primary_symtab;
7257 if (dwarf2_per_objfile->using_index)
7258 per_cu->v.quick->symtab = symtab;
7261 struct partial_symtab *pst = per_cu->v.psymtab;
7262 pst->symtab = symtab;
7266 do_cleanups (back_to);
7269 /* Process an imported unit DIE. */
7272 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7274 struct attribute *attr;
7276 /* For now we don't handle imported units in type units. */
7277 if (cu->per_cu->is_debug_types)
7279 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7280 " supported in type units [in module %s]"),
7284 attr = dwarf2_attr (die, DW_AT_import, cu);
7287 struct dwarf2_per_cu_data *per_cu;
7288 struct symtab *imported_symtab;
7292 offset = dwarf2_get_ref_die_offset (attr);
7293 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7294 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7296 /* Queue the unit, if needed. */
7297 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7298 load_full_comp_unit (per_cu, cu->language);
7300 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7305 /* Process a die and its children. */
7308 process_die (struct die_info *die, struct dwarf2_cu *cu)
7312 case DW_TAG_padding:
7314 case DW_TAG_compile_unit:
7315 case DW_TAG_partial_unit:
7316 read_file_scope (die, cu);
7318 case DW_TAG_type_unit:
7319 read_type_unit_scope (die, cu);
7321 case DW_TAG_subprogram:
7322 case DW_TAG_inlined_subroutine:
7323 read_func_scope (die, cu);
7325 case DW_TAG_lexical_block:
7326 case DW_TAG_try_block:
7327 case DW_TAG_catch_block:
7328 read_lexical_block_scope (die, cu);
7330 case DW_TAG_GNU_call_site:
7331 read_call_site_scope (die, cu);
7333 case DW_TAG_class_type:
7334 case DW_TAG_interface_type:
7335 case DW_TAG_structure_type:
7336 case DW_TAG_union_type:
7337 process_structure_scope (die, cu);
7339 case DW_TAG_enumeration_type:
7340 process_enumeration_scope (die, cu);
7343 /* These dies have a type, but processing them does not create
7344 a symbol or recurse to process the children. Therefore we can
7345 read them on-demand through read_type_die. */
7346 case DW_TAG_subroutine_type:
7347 case DW_TAG_set_type:
7348 case DW_TAG_array_type:
7349 case DW_TAG_pointer_type:
7350 case DW_TAG_ptr_to_member_type:
7351 case DW_TAG_reference_type:
7352 case DW_TAG_string_type:
7355 case DW_TAG_base_type:
7356 case DW_TAG_subrange_type:
7357 case DW_TAG_typedef:
7358 /* Add a typedef symbol for the type definition, if it has a
7360 new_symbol (die, read_type_die (die, cu), cu);
7362 case DW_TAG_common_block:
7363 read_common_block (die, cu);
7365 case DW_TAG_common_inclusion:
7367 case DW_TAG_namespace:
7368 cu->processing_has_namespace_info = 1;
7369 read_namespace (die, cu);
7372 cu->processing_has_namespace_info = 1;
7373 read_module (die, cu);
7375 case DW_TAG_imported_declaration:
7376 case DW_TAG_imported_module:
7377 cu->processing_has_namespace_info = 1;
7378 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7379 || cu->language != language_fortran))
7380 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7381 dwarf_tag_name (die->tag));
7382 read_import_statement (die, cu);
7385 case DW_TAG_imported_unit:
7386 process_imported_unit_die (die, cu);
7390 new_symbol (die, NULL, cu);
7395 /* DWARF name computation. */
7397 /* A helper function for dwarf2_compute_name which determines whether DIE
7398 needs to have the name of the scope prepended to the name listed in the
7402 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7404 struct attribute *attr;
7408 case DW_TAG_namespace:
7409 case DW_TAG_typedef:
7410 case DW_TAG_class_type:
7411 case DW_TAG_interface_type:
7412 case DW_TAG_structure_type:
7413 case DW_TAG_union_type:
7414 case DW_TAG_enumeration_type:
7415 case DW_TAG_enumerator:
7416 case DW_TAG_subprogram:
7420 case DW_TAG_variable:
7421 case DW_TAG_constant:
7422 /* We only need to prefix "globally" visible variables. These include
7423 any variable marked with DW_AT_external or any variable that
7424 lives in a namespace. [Variables in anonymous namespaces
7425 require prefixing, but they are not DW_AT_external.] */
7427 if (dwarf2_attr (die, DW_AT_specification, cu))
7429 struct dwarf2_cu *spec_cu = cu;
7431 return die_needs_namespace (die_specification (die, &spec_cu),
7435 attr = dwarf2_attr (die, DW_AT_external, cu);
7436 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7437 && die->parent->tag != DW_TAG_module)
7439 /* A variable in a lexical block of some kind does not need a
7440 namespace, even though in C++ such variables may be external
7441 and have a mangled name. */
7442 if (die->parent->tag == DW_TAG_lexical_block
7443 || die->parent->tag == DW_TAG_try_block
7444 || die->parent->tag == DW_TAG_catch_block
7445 || die->parent->tag == DW_TAG_subprogram)
7454 /* Retrieve the last character from a mem_file. */
7457 do_ui_file_peek_last (void *object, const char *buffer, long length)
7459 char *last_char_p = (char *) object;
7462 *last_char_p = buffer[length - 1];
7465 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7466 compute the physname for the object, which include a method's:
7467 - formal parameters (C++/Java),
7468 - receiver type (Go),
7469 - return type (Java).
7471 The term "physname" is a bit confusing.
7472 For C++, for example, it is the demangled name.
7473 For Go, for example, it's the mangled name.
7475 For Ada, return the DIE's linkage name rather than the fully qualified
7476 name. PHYSNAME is ignored..
7478 The result is allocated on the objfile_obstack and canonicalized. */
7481 dwarf2_compute_name (const char *name,
7482 struct die_info *die, struct dwarf2_cu *cu,
7485 struct objfile *objfile = cu->objfile;
7488 name = dwarf2_name (die, cu);
7490 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7491 compute it by typename_concat inside GDB. */
7492 if (cu->language == language_ada
7493 || (cu->language == language_fortran && physname))
7495 /* For Ada unit, we prefer the linkage name over the name, as
7496 the former contains the exported name, which the user expects
7497 to be able to reference. Ideally, we want the user to be able
7498 to reference this entity using either natural or linkage name,
7499 but we haven't started looking at this enhancement yet. */
7500 struct attribute *attr;
7502 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7504 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7505 if (attr && DW_STRING (attr))
7506 return DW_STRING (attr);
7509 /* These are the only languages we know how to qualify names in. */
7511 && (cu->language == language_cplus || cu->language == language_java
7512 || cu->language == language_fortran))
7514 if (die_needs_namespace (die, cu))
7518 struct ui_file *buf;
7520 prefix = determine_prefix (die, cu);
7521 buf = mem_fileopen ();
7522 if (*prefix != '\0')
7524 char *prefixed_name = typename_concat (NULL, prefix, name,
7527 fputs_unfiltered (prefixed_name, buf);
7528 xfree (prefixed_name);
7531 fputs_unfiltered (name, buf);
7533 /* Template parameters may be specified in the DIE's DW_AT_name, or
7534 as children with DW_TAG_template_type_param or
7535 DW_TAG_value_type_param. If the latter, add them to the name
7536 here. If the name already has template parameters, then
7537 skip this step; some versions of GCC emit both, and
7538 it is more efficient to use the pre-computed name.
7540 Something to keep in mind about this process: it is very
7541 unlikely, or in some cases downright impossible, to produce
7542 something that will match the mangled name of a function.
7543 If the definition of the function has the same debug info,
7544 we should be able to match up with it anyway. But fallbacks
7545 using the minimal symbol, for instance to find a method
7546 implemented in a stripped copy of libstdc++, will not work.
7547 If we do not have debug info for the definition, we will have to
7548 match them up some other way.
7550 When we do name matching there is a related problem with function
7551 templates; two instantiated function templates are allowed to
7552 differ only by their return types, which we do not add here. */
7554 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7556 struct attribute *attr;
7557 struct die_info *child;
7560 die->building_fullname = 1;
7562 for (child = die->child; child != NULL; child = child->sibling)
7566 const gdb_byte *bytes;
7567 struct dwarf2_locexpr_baton *baton;
7570 if (child->tag != DW_TAG_template_type_param
7571 && child->tag != DW_TAG_template_value_param)
7576 fputs_unfiltered ("<", buf);
7580 fputs_unfiltered (", ", buf);
7582 attr = dwarf2_attr (child, DW_AT_type, cu);
7585 complaint (&symfile_complaints,
7586 _("template parameter missing DW_AT_type"));
7587 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7590 type = die_type (child, cu);
7592 if (child->tag == DW_TAG_template_type_param)
7594 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7598 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7601 complaint (&symfile_complaints,
7602 _("template parameter missing "
7603 "DW_AT_const_value"));
7604 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7608 dwarf2_const_value_attr (attr, type, name,
7609 &cu->comp_unit_obstack, cu,
7610 &value, &bytes, &baton);
7612 if (TYPE_NOSIGN (type))
7613 /* GDB prints characters as NUMBER 'CHAR'. If that's
7614 changed, this can use value_print instead. */
7615 c_printchar (value, type, buf);
7618 struct value_print_options opts;
7621 v = dwarf2_evaluate_loc_desc (type, NULL,
7625 else if (bytes != NULL)
7627 v = allocate_value (type);
7628 memcpy (value_contents_writeable (v), bytes,
7629 TYPE_LENGTH (type));
7632 v = value_from_longest (type, value);
7634 /* Specify decimal so that we do not depend on
7636 get_formatted_print_options (&opts, 'd');
7638 value_print (v, buf, &opts);
7644 die->building_fullname = 0;
7648 /* Close the argument list, with a space if necessary
7649 (nested templates). */
7650 char last_char = '\0';
7651 ui_file_put (buf, do_ui_file_peek_last, &last_char);
7652 if (last_char == '>')
7653 fputs_unfiltered (" >", buf);
7655 fputs_unfiltered (">", buf);
7659 /* For Java and C++ methods, append formal parameter type
7660 information, if PHYSNAME. */
7662 if (physname && die->tag == DW_TAG_subprogram
7663 && (cu->language == language_cplus
7664 || cu->language == language_java))
7666 struct type *type = read_type_die (die, cu);
7668 c_type_print_args (type, buf, 1, cu->language,
7669 &type_print_raw_options);
7671 if (cu->language == language_java)
7673 /* For java, we must append the return type to method
7675 if (die->tag == DW_TAG_subprogram)
7676 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
7677 0, 0, &type_print_raw_options);
7679 else if (cu->language == language_cplus)
7681 /* Assume that an artificial first parameter is
7682 "this", but do not crash if it is not. RealView
7683 marks unnamed (and thus unused) parameters as
7684 artificial; there is no way to differentiate
7686 if (TYPE_NFIELDS (type) > 0
7687 && TYPE_FIELD_ARTIFICIAL (type, 0)
7688 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
7689 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
7691 fputs_unfiltered (" const", buf);
7695 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
7697 ui_file_delete (buf);
7699 if (cu->language == language_cplus)
7702 = dwarf2_canonicalize_name (name, cu,
7703 &objfile->objfile_obstack);
7714 /* Return the fully qualified name of DIE, based on its DW_AT_name.
7715 If scope qualifiers are appropriate they will be added. The result
7716 will be allocated on the objfile_obstack, or NULL if the DIE does
7717 not have a name. NAME may either be from a previous call to
7718 dwarf2_name or NULL.
7720 The output string will be canonicalized (if C++/Java). */
7723 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7725 return dwarf2_compute_name (name, die, cu, 0);
7728 /* Construct a physname for the given DIE in CU. NAME may either be
7729 from a previous call to dwarf2_name or NULL. The result will be
7730 allocated on the objfile_objstack or NULL if the DIE does not have a
7733 The output string will be canonicalized (if C++/Java). */
7736 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7738 struct objfile *objfile = cu->objfile;
7739 struct attribute *attr;
7740 const char *retval, *mangled = NULL, *canon = NULL;
7741 struct cleanup *back_to;
7744 /* In this case dwarf2_compute_name is just a shortcut not building anything
7746 if (!die_needs_namespace (die, cu))
7747 return dwarf2_compute_name (name, die, cu, 1);
7749 back_to = make_cleanup (null_cleanup, NULL);
7751 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7753 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7755 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
7757 if (attr && DW_STRING (attr))
7761 mangled = DW_STRING (attr);
7763 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
7764 type. It is easier for GDB users to search for such functions as
7765 `name(params)' than `long name(params)'. In such case the minimal
7766 symbol names do not match the full symbol names but for template
7767 functions there is never a need to look up their definition from their
7768 declaration so the only disadvantage remains the minimal symbol
7769 variant `long name(params)' does not have the proper inferior type.
7772 if (cu->language == language_go)
7774 /* This is a lie, but we already lie to the caller new_symbol_full.
7775 new_symbol_full assumes we return the mangled name.
7776 This just undoes that lie until things are cleaned up. */
7781 demangled = gdb_demangle (mangled,
7782 (DMGL_PARAMS | DMGL_ANSI
7783 | (cu->language == language_java
7784 ? DMGL_JAVA | DMGL_RET_POSTFIX
7789 make_cleanup (xfree, demangled);
7799 if (canon == NULL || check_physname)
7801 const char *physname = dwarf2_compute_name (name, die, cu, 1);
7803 if (canon != NULL && strcmp (physname, canon) != 0)
7805 /* It may not mean a bug in GDB. The compiler could also
7806 compute DW_AT_linkage_name incorrectly. But in such case
7807 GDB would need to be bug-to-bug compatible. */
7809 complaint (&symfile_complaints,
7810 _("Computed physname <%s> does not match demangled <%s> "
7811 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
7812 physname, canon, mangled, die->offset.sect_off, objfile->name);
7814 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
7815 is available here - over computed PHYSNAME. It is safer
7816 against both buggy GDB and buggy compilers. */
7830 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
7832 do_cleanups (back_to);
7836 /* Read the import statement specified by the given die and record it. */
7839 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
7841 struct objfile *objfile = cu->objfile;
7842 struct attribute *import_attr;
7843 struct die_info *imported_die, *child_die;
7844 struct dwarf2_cu *imported_cu;
7845 const char *imported_name;
7846 const char *imported_name_prefix;
7847 const char *canonical_name;
7848 const char *import_alias;
7849 const char *imported_declaration = NULL;
7850 const char *import_prefix;
7851 VEC (const_char_ptr) *excludes = NULL;
7852 struct cleanup *cleanups;
7854 import_attr = dwarf2_attr (die, DW_AT_import, cu);
7855 if (import_attr == NULL)
7857 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7858 dwarf_tag_name (die->tag));
7863 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
7864 imported_name = dwarf2_name (imported_die, imported_cu);
7865 if (imported_name == NULL)
7867 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
7869 The import in the following code:
7883 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
7884 <52> DW_AT_decl_file : 1
7885 <53> DW_AT_decl_line : 6
7886 <54> DW_AT_import : <0x75>
7887 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
7889 <5b> DW_AT_decl_file : 1
7890 <5c> DW_AT_decl_line : 2
7891 <5d> DW_AT_type : <0x6e>
7893 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
7894 <76> DW_AT_byte_size : 4
7895 <77> DW_AT_encoding : 5 (signed)
7897 imports the wrong die ( 0x75 instead of 0x58 ).
7898 This case will be ignored until the gcc bug is fixed. */
7902 /* Figure out the local name after import. */
7903 import_alias = dwarf2_name (die, cu);
7905 /* Figure out where the statement is being imported to. */
7906 import_prefix = determine_prefix (die, cu);
7908 /* Figure out what the scope of the imported die is and prepend it
7909 to the name of the imported die. */
7910 imported_name_prefix = determine_prefix (imported_die, imported_cu);
7912 if (imported_die->tag != DW_TAG_namespace
7913 && imported_die->tag != DW_TAG_module)
7915 imported_declaration = imported_name;
7916 canonical_name = imported_name_prefix;
7918 else if (strlen (imported_name_prefix) > 0)
7919 canonical_name = obconcat (&objfile->objfile_obstack,
7920 imported_name_prefix, "::", imported_name,
7923 canonical_name = imported_name;
7925 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
7927 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
7928 for (child_die = die->child; child_die && child_die->tag;
7929 child_die = sibling_die (child_die))
7931 /* DWARF-4: A Fortran use statement with a “rename list” may be
7932 represented by an imported module entry with an import attribute
7933 referring to the module and owned entries corresponding to those
7934 entities that are renamed as part of being imported. */
7936 if (child_die->tag != DW_TAG_imported_declaration)
7938 complaint (&symfile_complaints,
7939 _("child DW_TAG_imported_declaration expected "
7940 "- DIE at 0x%x [in module %s]"),
7941 child_die->offset.sect_off, objfile->name);
7945 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
7946 if (import_attr == NULL)
7948 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7949 dwarf_tag_name (child_die->tag));
7954 imported_die = follow_die_ref_or_sig (child_die, import_attr,
7956 imported_name = dwarf2_name (imported_die, imported_cu);
7957 if (imported_name == NULL)
7959 complaint (&symfile_complaints,
7960 _("child DW_TAG_imported_declaration has unknown "
7961 "imported name - DIE at 0x%x [in module %s]"),
7962 child_die->offset.sect_off, objfile->name);
7966 VEC_safe_push (const_char_ptr, excludes, imported_name);
7968 process_die (child_die, cu);
7971 cp_add_using_directive (import_prefix,
7974 imported_declaration,
7977 &objfile->objfile_obstack);
7979 do_cleanups (cleanups);
7982 /* Cleanup function for handle_DW_AT_stmt_list. */
7985 free_cu_line_header (void *arg)
7987 struct dwarf2_cu *cu = arg;
7989 free_line_header (cu->line_header);
7990 cu->line_header = NULL;
7993 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
7994 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
7995 this, it was first present in GCC release 4.3.0. */
7998 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8000 if (!cu->checked_producer)
8001 check_producer (cu);
8003 return cu->producer_is_gcc_lt_4_3;
8007 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8008 const char **name, const char **comp_dir)
8010 struct attribute *attr;
8015 /* Find the filename. Do not use dwarf2_name here, since the filename
8016 is not a source language identifier. */
8017 attr = dwarf2_attr (die, DW_AT_name, cu);
8020 *name = DW_STRING (attr);
8023 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8025 *comp_dir = DW_STRING (attr);
8026 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8027 && IS_ABSOLUTE_PATH (*name))
8029 char *d = ldirname (*name);
8033 make_cleanup (xfree, d);
8035 if (*comp_dir != NULL)
8037 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8038 directory, get rid of it. */
8039 char *cp = strchr (*comp_dir, ':');
8041 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8046 *name = "<unknown>";
8049 /* Handle DW_AT_stmt_list for a compilation unit.
8050 DIE is the DW_TAG_compile_unit die for CU.
8051 COMP_DIR is the compilation directory.
8052 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8055 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8056 const char *comp_dir)
8058 struct attribute *attr;
8060 gdb_assert (! cu->per_cu->is_debug_types);
8062 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8065 unsigned int line_offset = DW_UNSND (attr);
8066 struct line_header *line_header
8067 = dwarf_decode_line_header (line_offset, cu);
8071 cu->line_header = line_header;
8072 make_cleanup (free_cu_line_header, cu);
8073 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8078 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8081 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8083 struct objfile *objfile = dwarf2_per_objfile->objfile;
8084 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8085 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8086 CORE_ADDR highpc = ((CORE_ADDR) 0);
8087 struct attribute *attr;
8088 const char *name = NULL;
8089 const char *comp_dir = NULL;
8090 struct die_info *child_die;
8091 bfd *abfd = objfile->obfd;
8094 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8096 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8098 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8099 from finish_block. */
8100 if (lowpc == ((CORE_ADDR) -1))
8105 find_file_and_directory (die, cu, &name, &comp_dir);
8107 prepare_one_comp_unit (cu, die, cu->language);
8109 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8110 standardised yet. As a workaround for the language detection we fall
8111 back to the DW_AT_producer string. */
8112 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8113 cu->language = language_opencl;
8115 /* Similar hack for Go. */
8116 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8117 set_cu_language (DW_LANG_Go, cu);
8119 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8121 /* Decode line number information if present. We do this before
8122 processing child DIEs, so that the line header table is available
8123 for DW_AT_decl_file. */
8124 handle_DW_AT_stmt_list (die, cu, comp_dir);
8126 /* Process all dies in compilation unit. */
8127 if (die->child != NULL)
8129 child_die = die->child;
8130 while (child_die && child_die->tag)
8132 process_die (child_die, cu);
8133 child_die = sibling_die (child_die);
8137 /* Decode macro information, if present. Dwarf 2 macro information
8138 refers to information in the line number info statement program
8139 header, so we can only read it if we've read the header
8141 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8142 if (attr && cu->line_header)
8144 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8145 complaint (&symfile_complaints,
8146 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8148 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8152 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8153 if (attr && cu->line_header)
8155 unsigned int macro_offset = DW_UNSND (attr);
8157 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8161 do_cleanups (back_to);
8164 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8165 Create the set of symtabs used by this TU, or if this TU is sharing
8166 symtabs with another TU and the symtabs have already been created
8167 then restore those symtabs in the line header.
8168 We don't need the pc/line-number mapping for type units. */
8171 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8173 struct objfile *objfile = dwarf2_per_objfile->objfile;
8174 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8175 struct type_unit_group *tu_group;
8177 struct line_header *lh;
8178 struct attribute *attr;
8179 unsigned int i, line_offset;
8180 struct signatured_type *sig_type;
8182 gdb_assert (per_cu->is_debug_types);
8183 sig_type = (struct signatured_type *) per_cu;
8185 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8187 /* If we're using .gdb_index (includes -readnow) then
8188 per_cu->s.type_unit_group may not have been set up yet. */
8189 if (sig_type->type_unit_group == NULL)
8190 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8191 tu_group = sig_type->type_unit_group;
8193 /* If we've already processed this stmt_list there's no real need to
8194 do it again, we could fake it and just recreate the part we need
8195 (file name,index -> symtab mapping). If data shows this optimization
8196 is useful we can do it then. */
8197 first_time = tu_group->primary_symtab == NULL;
8199 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8204 line_offset = DW_UNSND (attr);
8205 lh = dwarf_decode_line_header (line_offset, cu);
8210 dwarf2_start_symtab (cu, "", NULL, 0);
8213 gdb_assert (tu_group->symtabs == NULL);
8216 /* Note: The primary symtab will get allocated at the end. */
8220 cu->line_header = lh;
8221 make_cleanup (free_cu_line_header, cu);
8225 dwarf2_start_symtab (cu, "", NULL, 0);
8227 tu_group->num_symtabs = lh->num_file_names;
8228 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8230 for (i = 0; i < lh->num_file_names; ++i)
8232 const char *dir = NULL;
8233 struct file_entry *fe = &lh->file_names[i];
8236 dir = lh->include_dirs[fe->dir_index - 1];
8237 dwarf2_start_subfile (fe->name, dir, NULL);
8239 /* Note: We don't have to watch for the main subfile here, type units
8240 don't have DW_AT_name. */
8242 if (current_subfile->symtab == NULL)
8244 /* NOTE: start_subfile will recognize when it's been passed
8245 a file it has already seen. So we can't assume there's a
8246 simple mapping from lh->file_names to subfiles,
8247 lh->file_names may contain dups. */
8248 current_subfile->symtab = allocate_symtab (current_subfile->name,
8252 fe->symtab = current_subfile->symtab;
8253 tu_group->symtabs[i] = fe->symtab;
8260 for (i = 0; i < lh->num_file_names; ++i)
8262 struct file_entry *fe = &lh->file_names[i];
8264 fe->symtab = tu_group->symtabs[i];
8268 /* The main symtab is allocated last. Type units don't have DW_AT_name
8269 so they don't have a "real" (so to speak) symtab anyway.
8270 There is later code that will assign the main symtab to all symbols
8271 that don't have one. We need to handle the case of a symbol with a
8272 missing symtab (DW_AT_decl_file) anyway. */
8275 /* Process DW_TAG_type_unit.
8276 For TUs we want to skip the first top level sibling if it's not the
8277 actual type being defined by this TU. In this case the first top
8278 level sibling is there to provide context only. */
8281 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8283 struct die_info *child_die;
8285 prepare_one_comp_unit (cu, die, language_minimal);
8287 /* Initialize (or reinitialize) the machinery for building symtabs.
8288 We do this before processing child DIEs, so that the line header table
8289 is available for DW_AT_decl_file. */
8290 setup_type_unit_groups (die, cu);
8292 if (die->child != NULL)
8294 child_die = die->child;
8295 while (child_die && child_die->tag)
8297 process_die (child_die, cu);
8298 child_die = sibling_die (child_die);
8305 http://gcc.gnu.org/wiki/DebugFission
8306 http://gcc.gnu.org/wiki/DebugFissionDWP
8308 To simplify handling of both DWO files ("object" files with the DWARF info)
8309 and DWP files (a file with the DWOs packaged up into one file), we treat
8310 DWP files as having a collection of virtual DWO files. */
8313 hash_dwo_file (const void *item)
8315 const struct dwo_file *dwo_file = item;
8317 return (htab_hash_string (dwo_file->dwo_name)
8318 + htab_hash_string (dwo_file->comp_dir));
8322 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8324 const struct dwo_file *lhs = item_lhs;
8325 const struct dwo_file *rhs = item_rhs;
8327 return (strcmp (lhs->dwo_name, rhs->dwo_name) == 0
8328 && strcmp (lhs->comp_dir, rhs->comp_dir) == 0);
8331 /* Allocate a hash table for DWO files. */
8334 allocate_dwo_file_hash_table (void)
8336 struct objfile *objfile = dwarf2_per_objfile->objfile;
8338 return htab_create_alloc_ex (41,
8342 &objfile->objfile_obstack,
8343 hashtab_obstack_allocate,
8344 dummy_obstack_deallocate);
8347 /* Lookup DWO file DWO_NAME. */
8350 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8352 struct dwo_file find_entry;
8355 if (dwarf2_per_objfile->dwo_files == NULL)
8356 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8358 memset (&find_entry, 0, sizeof (find_entry));
8359 find_entry.dwo_name = dwo_name;
8360 find_entry.comp_dir = comp_dir;
8361 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8367 hash_dwo_unit (const void *item)
8369 const struct dwo_unit *dwo_unit = item;
8371 /* This drops the top 32 bits of the id, but is ok for a hash. */
8372 return dwo_unit->signature;
8376 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8378 const struct dwo_unit *lhs = item_lhs;
8379 const struct dwo_unit *rhs = item_rhs;
8381 /* The signature is assumed to be unique within the DWO file.
8382 So while object file CU dwo_id's always have the value zero,
8383 that's OK, assuming each object file DWO file has only one CU,
8384 and that's the rule for now. */
8385 return lhs->signature == rhs->signature;
8388 /* Allocate a hash table for DWO CUs,TUs.
8389 There is one of these tables for each of CUs,TUs for each DWO file. */
8392 allocate_dwo_unit_table (struct objfile *objfile)
8394 /* Start out with a pretty small number.
8395 Generally DWO files contain only one CU and maybe some TUs. */
8396 return htab_create_alloc_ex (3,
8400 &objfile->objfile_obstack,
8401 hashtab_obstack_allocate,
8402 dummy_obstack_deallocate);
8405 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8407 struct create_dwo_cu_data
8409 struct dwo_file *dwo_file;
8410 struct dwo_unit dwo_unit;
8413 /* die_reader_func for create_dwo_cu. */
8416 create_dwo_cu_reader (const struct die_reader_specs *reader,
8417 const gdb_byte *info_ptr,
8418 struct die_info *comp_unit_die,
8422 struct dwarf2_cu *cu = reader->cu;
8423 struct objfile *objfile = dwarf2_per_objfile->objfile;
8424 sect_offset offset = cu->per_cu->offset;
8425 struct dwarf2_section_info *section = cu->per_cu->section;
8426 struct create_dwo_cu_data *data = datap;
8427 struct dwo_file *dwo_file = data->dwo_file;
8428 struct dwo_unit *dwo_unit = &data->dwo_unit;
8429 struct attribute *attr;
8431 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8434 complaint (&symfile_complaints,
8435 _("Dwarf Error: debug entry at offset 0x%x is missing"
8436 " its dwo_id [in module %s]"),
8437 offset.sect_off, dwo_file->dwo_name);
8441 dwo_unit->dwo_file = dwo_file;
8442 dwo_unit->signature = DW_UNSND (attr);
8443 dwo_unit->section = section;
8444 dwo_unit->offset = offset;
8445 dwo_unit->length = cu->per_cu->length;
8447 if (dwarf2_read_debug)
8448 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8449 offset.sect_off, hex_string (dwo_unit->signature));
8452 /* Create the dwo_unit for the lone CU in DWO_FILE.
8453 Note: This function processes DWO files only, not DWP files. */
8455 static struct dwo_unit *
8456 create_dwo_cu (struct dwo_file *dwo_file)
8458 struct objfile *objfile = dwarf2_per_objfile->objfile;
8459 struct dwarf2_section_info *section = &dwo_file->sections.info;
8462 const gdb_byte *info_ptr, *end_ptr;
8463 struct create_dwo_cu_data create_dwo_cu_data;
8464 struct dwo_unit *dwo_unit;
8466 dwarf2_read_section (objfile, section);
8467 info_ptr = section->buffer;
8469 if (info_ptr == NULL)
8472 /* We can't set abfd until now because the section may be empty or
8473 not present, in which case section->asection will be NULL. */
8474 abfd = section->asection->owner;
8476 if (dwarf2_read_debug)
8478 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8479 bfd_section_name (abfd, section->asection),
8480 bfd_get_filename (abfd));
8483 create_dwo_cu_data.dwo_file = dwo_file;
8486 end_ptr = info_ptr + section->size;
8487 while (info_ptr < end_ptr)
8489 struct dwarf2_per_cu_data per_cu;
8491 memset (&create_dwo_cu_data.dwo_unit, 0,
8492 sizeof (create_dwo_cu_data.dwo_unit));
8493 memset (&per_cu, 0, sizeof (per_cu));
8494 per_cu.objfile = objfile;
8495 per_cu.is_debug_types = 0;
8496 per_cu.offset.sect_off = info_ptr - section->buffer;
8497 per_cu.section = section;
8499 init_cutu_and_read_dies_no_follow (&per_cu,
8500 &dwo_file->sections.abbrev,
8502 create_dwo_cu_reader,
8503 &create_dwo_cu_data);
8505 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8507 /* If we've already found one, complain. We only support one
8508 because having more than one requires hacking the dwo_name of
8509 each to match, which is highly unlikely to happen. */
8510 if (dwo_unit != NULL)
8512 complaint (&symfile_complaints,
8513 _("Multiple CUs in DWO file %s [in module %s]"),
8514 dwo_file->dwo_name, objfile->name);
8518 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8519 *dwo_unit = create_dwo_cu_data.dwo_unit;
8522 info_ptr += per_cu.length;
8528 /* DWP file .debug_{cu,tu}_index section format:
8529 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8531 Both index sections have the same format, and serve to map a 64-bit
8532 signature to a set of section numbers. Each section begins with a header,
8533 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8534 indexes, and a pool of 32-bit section numbers. The index sections will be
8535 aligned at 8-byte boundaries in the file.
8537 The index section header contains two unsigned 32-bit values (using the
8538 byte order of the application binary):
8540 N, the number of compilation units or type units in the index
8541 M, the number of slots in the hash table
8543 (We assume that N and M will not exceed 2^32 - 1.)
8545 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8547 The hash table begins at offset 8 in the section, and consists of an array
8548 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8549 order of the application binary). Unused slots in the hash table are 0.
8550 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8552 The parallel table begins immediately after the hash table
8553 (at offset 8 + 8 * M from the beginning of the section), and consists of an
8554 array of 32-bit indexes (using the byte order of the application binary),
8555 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8556 table contains a 32-bit index into the pool of section numbers. For unused
8557 hash table slots, the corresponding entry in the parallel table will be 0.
8559 Given a 64-bit compilation unit signature or a type signature S, an entry
8560 in the hash table is located as follows:
8562 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8563 the low-order k bits all set to 1.
8565 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8567 3) If the hash table entry at index H matches the signature, use that
8568 entry. If the hash table entry at index H is unused (all zeroes),
8569 terminate the search: the signature is not present in the table.
8571 4) Let H = (H + H') modulo M. Repeat at Step 3.
8573 Because M > N and H' and M are relatively prime, the search is guaranteed
8574 to stop at an unused slot or find the match.
8576 The pool of section numbers begins immediately following the hash table
8577 (at offset 8 + 12 * M from the beginning of the section). The pool of
8578 section numbers consists of an array of 32-bit words (using the byte order
8579 of the application binary). Each item in the array is indexed starting
8580 from 0. The hash table entry provides the index of the first section
8581 number in the set. Additional section numbers in the set follow, and the
8582 set is terminated by a 0 entry (section number 0 is not used in ELF).
8584 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8585 section must be the first entry in the set, and the .debug_abbrev.dwo must
8586 be the second entry. Other members of the set may follow in any order. */
8588 /* Create a hash table to map DWO IDs to their CU/TU entry in
8589 .debug_{info,types}.dwo in DWP_FILE.
8590 Returns NULL if there isn't one.
8591 Note: This function processes DWP files only, not DWO files. */
8593 static struct dwp_hash_table *
8594 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8596 struct objfile *objfile = dwarf2_per_objfile->objfile;
8597 bfd *dbfd = dwp_file->dbfd;
8598 const gdb_byte *index_ptr, *index_end;
8599 struct dwarf2_section_info *index;
8600 uint32_t version, nr_units, nr_slots;
8601 struct dwp_hash_table *htab;
8604 index = &dwp_file->sections.tu_index;
8606 index = &dwp_file->sections.cu_index;
8608 if (dwarf2_section_empty_p (index))
8610 dwarf2_read_section (objfile, index);
8612 index_ptr = index->buffer;
8613 index_end = index_ptr + index->size;
8615 version = read_4_bytes (dbfd, index_ptr);
8616 index_ptr += 8; /* Skip the unused word. */
8617 nr_units = read_4_bytes (dbfd, index_ptr);
8619 nr_slots = read_4_bytes (dbfd, index_ptr);
8624 error (_("Dwarf Error: unsupported DWP file version (%u)"
8626 version, dwp_file->name);
8628 if (nr_slots != (nr_slots & -nr_slots))
8630 error (_("Dwarf Error: number of slots in DWP hash table (%u)"
8631 " is not power of 2 [in module %s]"),
8632 nr_slots, dwp_file->name);
8635 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
8636 htab->nr_units = nr_units;
8637 htab->nr_slots = nr_slots;
8638 htab->hash_table = index_ptr;
8639 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
8640 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
8645 /* Update SECTIONS with the data from SECTP.
8647 This function is like the other "locate" section routines that are
8648 passed to bfd_map_over_sections, but in this context the sections to
8649 read comes from the DWP hash table, not the full ELF section table.
8651 The result is non-zero for success, or zero if an error was found. */
8654 locate_virtual_dwo_sections (asection *sectp,
8655 struct virtual_dwo_sections *sections)
8657 const struct dwop_section_names *names = &dwop_section_names;
8659 if (section_is_p (sectp->name, &names->abbrev_dwo))
8661 /* There can be only one. */
8662 if (sections->abbrev.asection != NULL)
8664 sections->abbrev.asection = sectp;
8665 sections->abbrev.size = bfd_get_section_size (sectp);
8667 else if (section_is_p (sectp->name, &names->info_dwo)
8668 || section_is_p (sectp->name, &names->types_dwo))
8670 /* There can be only one. */
8671 if (sections->info_or_types.asection != NULL)
8673 sections->info_or_types.asection = sectp;
8674 sections->info_or_types.size = bfd_get_section_size (sectp);
8676 else if (section_is_p (sectp->name, &names->line_dwo))
8678 /* There can be only one. */
8679 if (sections->line.asection != NULL)
8681 sections->line.asection = sectp;
8682 sections->line.size = bfd_get_section_size (sectp);
8684 else if (section_is_p (sectp->name, &names->loc_dwo))
8686 /* There can be only one. */
8687 if (sections->loc.asection != NULL)
8689 sections->loc.asection = sectp;
8690 sections->loc.size = bfd_get_section_size (sectp);
8692 else if (section_is_p (sectp->name, &names->macinfo_dwo))
8694 /* There can be only one. */
8695 if (sections->macinfo.asection != NULL)
8697 sections->macinfo.asection = sectp;
8698 sections->macinfo.size = bfd_get_section_size (sectp);
8700 else if (section_is_p (sectp->name, &names->macro_dwo))
8702 /* There can be only one. */
8703 if (sections->macro.asection != NULL)
8705 sections->macro.asection = sectp;
8706 sections->macro.size = bfd_get_section_size (sectp);
8708 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
8710 /* There can be only one. */
8711 if (sections->str_offsets.asection != NULL)
8713 sections->str_offsets.asection = sectp;
8714 sections->str_offsets.size = bfd_get_section_size (sectp);
8718 /* No other kind of section is valid. */
8725 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
8726 HTAB is the hash table from the DWP file.
8727 SECTION_INDEX is the index of the DWO in HTAB.
8728 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
8730 static struct dwo_unit *
8731 create_dwo_in_dwp (struct dwp_file *dwp_file,
8732 const struct dwp_hash_table *htab,
8733 uint32_t section_index,
8734 const char *comp_dir,
8735 ULONGEST signature, int is_debug_types)
8737 struct objfile *objfile = dwarf2_per_objfile->objfile;
8738 bfd *dbfd = dwp_file->dbfd;
8739 const char *kind = is_debug_types ? "TU" : "CU";
8740 struct dwo_file *dwo_file;
8741 struct dwo_unit *dwo_unit;
8742 struct virtual_dwo_sections sections;
8743 void **dwo_file_slot;
8744 char *virtual_dwo_name;
8745 struct dwarf2_section_info *cutu;
8746 struct cleanup *cleanups;
8749 if (dwarf2_read_debug)
8751 fprintf_unfiltered (gdb_stdlog, "Reading %s %u/%s in DWP file: %s\n",
8753 section_index, hex_string (signature),
8757 /* Fetch the sections of this DWO.
8758 Put a limit on the number of sections we look for so that bad data
8759 doesn't cause us to loop forever. */
8761 #define MAX_NR_DWO_SECTIONS \
8762 (1 /* .debug_info or .debug_types */ \
8763 + 1 /* .debug_abbrev */ \
8764 + 1 /* .debug_line */ \
8765 + 1 /* .debug_loc */ \
8766 + 1 /* .debug_str_offsets */ \
8767 + 1 /* .debug_macro */ \
8768 + 1 /* .debug_macinfo */ \
8769 + 1 /* trailing zero */)
8771 memset (§ions, 0, sizeof (sections));
8772 cleanups = make_cleanup (null_cleanup, 0);
8774 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
8777 uint32_t section_nr =
8780 + (section_index + i) * sizeof (uint32_t));
8782 if (section_nr == 0)
8784 if (section_nr >= dwp_file->num_sections)
8786 error (_("Dwarf Error: bad DWP hash table, section number too large"
8791 sectp = dwp_file->elf_sections[section_nr];
8792 if (! locate_virtual_dwo_sections (sectp, §ions))
8794 error (_("Dwarf Error: bad DWP hash table, invalid section found"
8801 || sections.info_or_types.asection == NULL
8802 || sections.abbrev.asection == NULL)
8804 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
8808 if (i == MAX_NR_DWO_SECTIONS)
8810 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
8815 /* It's easier for the rest of the code if we fake a struct dwo_file and
8816 have dwo_unit "live" in that. At least for now.
8818 The DWP file can be made up of a random collection of CUs and TUs.
8819 However, for each CU + set of TUs that came from the same original DWO
8820 file, we want to combine them back into a virtual DWO file to save space
8821 (fewer struct dwo_file objects to allocated). Remember that for really
8822 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
8825 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
8826 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
8827 sections.line.asection ? sections.line.asection->id : 0,
8828 sections.loc.asection ? sections.loc.asection->id : 0,
8829 (sections.str_offsets.asection
8830 ? sections.str_offsets.asection->id
8832 make_cleanup (xfree, virtual_dwo_name);
8833 /* Can we use an existing virtual DWO file? */
8834 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
8835 /* Create one if necessary. */
8836 if (*dwo_file_slot == NULL)
8838 if (dwarf2_read_debug)
8840 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
8843 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
8844 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
8846 strlen (virtual_dwo_name));
8847 dwo_file->comp_dir = comp_dir;
8848 dwo_file->sections.abbrev = sections.abbrev;
8849 dwo_file->sections.line = sections.line;
8850 dwo_file->sections.loc = sections.loc;
8851 dwo_file->sections.macinfo = sections.macinfo;
8852 dwo_file->sections.macro = sections.macro;
8853 dwo_file->sections.str_offsets = sections.str_offsets;
8854 /* The "str" section is global to the entire DWP file. */
8855 dwo_file->sections.str = dwp_file->sections.str;
8856 /* The info or types section is assigned later to dwo_unit,
8857 there's no need to record it in dwo_file.
8858 Also, we can't simply record type sections in dwo_file because
8859 we record a pointer into the vector in dwo_unit. As we collect more
8860 types we'll grow the vector and eventually have to reallocate space
8861 for it, invalidating all the pointers into the current copy. */
8862 *dwo_file_slot = dwo_file;
8866 if (dwarf2_read_debug)
8868 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
8871 dwo_file = *dwo_file_slot;
8873 do_cleanups (cleanups);
8875 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8876 dwo_unit->dwo_file = dwo_file;
8877 dwo_unit->signature = signature;
8878 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
8879 sizeof (struct dwarf2_section_info));
8880 *dwo_unit->section = sections.info_or_types;
8881 /* offset, length, type_offset_in_tu are set later. */
8886 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
8888 static struct dwo_unit *
8889 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
8890 const struct dwp_hash_table *htab,
8891 const char *comp_dir,
8892 ULONGEST signature, int is_debug_types)
8894 bfd *dbfd = dwp_file->dbfd;
8895 uint32_t mask = htab->nr_slots - 1;
8896 uint32_t hash = signature & mask;
8897 uint32_t hash2 = ((signature >> 32) & mask) | 1;
8900 struct dwo_unit find_dwo_cu, *dwo_cu;
8902 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
8903 find_dwo_cu.signature = signature;
8904 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
8909 /* Use a for loop so that we don't loop forever on bad debug info. */
8910 for (i = 0; i < htab->nr_slots; ++i)
8912 ULONGEST signature_in_table;
8914 signature_in_table =
8915 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
8916 if (signature_in_table == signature)
8918 uint32_t section_index =
8919 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
8921 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
8922 comp_dir, signature, is_debug_types);
8925 if (signature_in_table == 0)
8927 hash = (hash + hash2) & mask;
8930 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
8935 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
8936 Open the file specified by FILE_NAME and hand it off to BFD for
8937 preliminary analysis. Return a newly initialized bfd *, which
8938 includes a canonicalized copy of FILE_NAME.
8939 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
8940 In case of trouble, return NULL.
8941 NOTE: This function is derived from symfile_bfd_open. */
8944 try_open_dwop_file (const char *file_name, int is_dwp)
8948 char *absolute_name;
8950 flags = OPF_TRY_CWD_FIRST;
8952 flags |= OPF_SEARCH_IN_PATH;
8953 desc = openp (debug_file_directory, flags, file_name,
8954 O_RDONLY | O_BINARY, &absolute_name);
8958 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
8961 xfree (absolute_name);
8964 xfree (absolute_name);
8965 bfd_set_cacheable (sym_bfd, 1);
8967 if (!bfd_check_format (sym_bfd, bfd_object))
8969 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
8976 /* Try to open DWO file FILE_NAME.
8977 COMP_DIR is the DW_AT_comp_dir attribute.
8978 The result is the bfd handle of the file.
8979 If there is a problem finding or opening the file, return NULL.
8980 Upon success, the canonicalized path of the file is stored in the bfd,
8981 same as symfile_bfd_open. */
8984 open_dwo_file (const char *file_name, const char *comp_dir)
8988 if (IS_ABSOLUTE_PATH (file_name))
8989 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
8991 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
8993 if (comp_dir != NULL)
8995 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
8997 /* NOTE: If comp_dir is a relative path, this will also try the
8998 search path, which seems useful. */
8999 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/);
9000 xfree (path_to_try);
9005 /* That didn't work, try debug-file-directory, which, despite its name,
9006 is a list of paths. */
9008 if (*debug_file_directory == '\0')
9011 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
9014 /* This function is mapped across the sections and remembers the offset and
9015 size of each of the DWO debugging sections we are interested in. */
9018 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9020 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9021 const struct dwop_section_names *names = &dwop_section_names;
9023 if (section_is_p (sectp->name, &names->abbrev_dwo))
9025 dwo_sections->abbrev.asection = sectp;
9026 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9028 else if (section_is_p (sectp->name, &names->info_dwo))
9030 dwo_sections->info.asection = sectp;
9031 dwo_sections->info.size = bfd_get_section_size (sectp);
9033 else if (section_is_p (sectp->name, &names->line_dwo))
9035 dwo_sections->line.asection = sectp;
9036 dwo_sections->line.size = bfd_get_section_size (sectp);
9038 else if (section_is_p (sectp->name, &names->loc_dwo))
9040 dwo_sections->loc.asection = sectp;
9041 dwo_sections->loc.size = bfd_get_section_size (sectp);
9043 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9045 dwo_sections->macinfo.asection = sectp;
9046 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9048 else if (section_is_p (sectp->name, &names->macro_dwo))
9050 dwo_sections->macro.asection = sectp;
9051 dwo_sections->macro.size = bfd_get_section_size (sectp);
9053 else if (section_is_p (sectp->name, &names->str_dwo))
9055 dwo_sections->str.asection = sectp;
9056 dwo_sections->str.size = bfd_get_section_size (sectp);
9058 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9060 dwo_sections->str_offsets.asection = sectp;
9061 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9063 else if (section_is_p (sectp->name, &names->types_dwo))
9065 struct dwarf2_section_info type_section;
9067 memset (&type_section, 0, sizeof (type_section));
9068 type_section.asection = sectp;
9069 type_section.size = bfd_get_section_size (sectp);
9070 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9075 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9076 by PER_CU. This is for the non-DWP case.
9077 The result is NULL if DWO_NAME can't be found. */
9079 static struct dwo_file *
9080 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9081 const char *dwo_name, const char *comp_dir)
9083 struct objfile *objfile = dwarf2_per_objfile->objfile;
9084 struct dwo_file *dwo_file;
9086 struct cleanup *cleanups;
9088 dbfd = open_dwo_file (dwo_name, comp_dir);
9091 if (dwarf2_read_debug)
9092 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9095 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9096 dwo_file->dwo_name = dwo_name;
9097 dwo_file->comp_dir = comp_dir;
9098 dwo_file->dbfd = dbfd;
9100 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9102 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9104 dwo_file->cu = create_dwo_cu (dwo_file);
9106 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9107 dwo_file->sections.types);
9109 discard_cleanups (cleanups);
9111 if (dwarf2_read_debug)
9112 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9117 /* This function is mapped across the sections and remembers the offset and
9118 size of each of the DWP debugging sections we are interested in. */
9121 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9123 struct dwp_file *dwp_file = dwp_file_ptr;
9124 const struct dwop_section_names *names = &dwop_section_names;
9125 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9127 /* Record the ELF section number for later lookup: this is what the
9128 .debug_cu_index,.debug_tu_index tables use. */
9129 gdb_assert (elf_section_nr < dwp_file->num_sections);
9130 dwp_file->elf_sections[elf_section_nr] = sectp;
9132 /* Look for specific sections that we need. */
9133 if (section_is_p (sectp->name, &names->str_dwo))
9135 dwp_file->sections.str.asection = sectp;
9136 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9138 else if (section_is_p (sectp->name, &names->cu_index))
9140 dwp_file->sections.cu_index.asection = sectp;
9141 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9143 else if (section_is_p (sectp->name, &names->tu_index))
9145 dwp_file->sections.tu_index.asection = sectp;
9146 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9150 /* Hash function for dwp_file loaded CUs/TUs. */
9153 hash_dwp_loaded_cutus (const void *item)
9155 const struct dwo_unit *dwo_unit = item;
9157 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9158 return dwo_unit->signature;
9161 /* Equality function for dwp_file loaded CUs/TUs. */
9164 eq_dwp_loaded_cutus (const void *a, const void *b)
9166 const struct dwo_unit *dua = a;
9167 const struct dwo_unit *dub = b;
9169 return dua->signature == dub->signature;
9172 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9175 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9177 return htab_create_alloc_ex (3,
9178 hash_dwp_loaded_cutus,
9179 eq_dwp_loaded_cutus,
9181 &objfile->objfile_obstack,
9182 hashtab_obstack_allocate,
9183 dummy_obstack_deallocate);
9186 /* Try to open DWP file FILE_NAME.
9187 The result is the bfd handle of the file.
9188 If there is a problem finding or opening the file, return NULL.
9189 Upon success, the canonicalized path of the file is stored in the bfd,
9190 same as symfile_bfd_open. */
9193 open_dwp_file (const char *file_name)
9195 return try_open_dwop_file (file_name, 1 /*is_dwp*/);
9198 /* Initialize the use of the DWP file for the current objfile.
9199 By convention the name of the DWP file is ${objfile}.dwp.
9200 The result is NULL if it can't be found. */
9202 static struct dwp_file *
9203 open_and_init_dwp_file (void)
9205 struct objfile *objfile = dwarf2_per_objfile->objfile;
9206 struct dwp_file *dwp_file;
9209 struct cleanup *cleanups;
9211 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9212 cleanups = make_cleanup (xfree, dwp_name);
9214 dbfd = open_dwp_file (dwp_name);
9217 if (dwarf2_read_debug)
9218 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9219 do_cleanups (cleanups);
9222 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9223 dwp_file->name = obstack_copy0 (&objfile->objfile_obstack,
9224 dwp_name, strlen (dwp_name));
9225 dwp_file->dbfd = dbfd;
9226 do_cleanups (cleanups);
9228 /* +1: section 0 is unused */
9229 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9230 dwp_file->elf_sections =
9231 OBSTACK_CALLOC (&objfile->objfile_obstack,
9232 dwp_file->num_sections, asection *);
9234 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9236 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9238 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9240 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9242 if (dwarf2_read_debug)
9244 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9245 fprintf_unfiltered (gdb_stdlog,
9246 " %u CUs, %u TUs\n",
9247 dwp_file->cus ? dwp_file->cus->nr_units : 0,
9248 dwp_file->tus ? dwp_file->tus->nr_units : 0);
9254 /* Wrapper around open_and_init_dwp_file, only open it once. */
9256 static struct dwp_file *
9259 if (! dwarf2_per_objfile->dwp_checked)
9261 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9262 dwarf2_per_objfile->dwp_checked = 1;
9264 return dwarf2_per_objfile->dwp_file;
9267 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9268 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9269 or in the DWP file for the objfile, referenced by THIS_UNIT.
9270 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9271 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9273 This is called, for example, when wanting to read a variable with a
9274 complex location. Therefore we don't want to do file i/o for every call.
9275 Therefore we don't want to look for a DWO file on every call.
9276 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9277 then we check if we've already seen DWO_NAME, and only THEN do we check
9280 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9281 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9283 static struct dwo_unit *
9284 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9285 const char *dwo_name, const char *comp_dir,
9286 ULONGEST signature, int is_debug_types)
9288 struct objfile *objfile = dwarf2_per_objfile->objfile;
9289 const char *kind = is_debug_types ? "TU" : "CU";
9290 void **dwo_file_slot;
9291 struct dwo_file *dwo_file;
9292 struct dwp_file *dwp_file;
9294 /* Have we already read SIGNATURE from a DWP file? */
9296 dwp_file = get_dwp_file ();
9297 if (dwp_file != NULL)
9299 const struct dwp_hash_table *dwp_htab =
9300 is_debug_types ? dwp_file->tus : dwp_file->cus;
9302 if (dwp_htab != NULL)
9304 struct dwo_unit *dwo_cutu =
9305 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9306 signature, is_debug_types);
9308 if (dwo_cutu != NULL)
9310 if (dwarf2_read_debug)
9312 fprintf_unfiltered (gdb_stdlog,
9313 "Virtual DWO %s %s found: @%s\n",
9314 kind, hex_string (signature),
9315 host_address_to_string (dwo_cutu));
9322 /* Have we already seen DWO_NAME? */
9324 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9325 if (*dwo_file_slot == NULL)
9327 /* Read in the file and build a table of the DWOs it contains. */
9328 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9330 /* NOTE: This will be NULL if unable to open the file. */
9331 dwo_file = *dwo_file_slot;
9333 if (dwo_file != NULL)
9335 struct dwo_unit *dwo_cutu = NULL;
9337 if (is_debug_types && dwo_file->tus)
9339 struct dwo_unit find_dwo_cutu;
9341 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9342 find_dwo_cutu.signature = signature;
9343 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9345 else if (!is_debug_types && dwo_file->cu)
9347 if (signature == dwo_file->cu->signature)
9348 dwo_cutu = dwo_file->cu;
9351 if (dwo_cutu != NULL)
9353 if (dwarf2_read_debug)
9355 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9356 kind, dwo_name, hex_string (signature),
9357 host_address_to_string (dwo_cutu));
9363 /* We didn't find it. This could mean a dwo_id mismatch, or
9364 someone deleted the DWO/DWP file, or the search path isn't set up
9365 correctly to find the file. */
9367 if (dwarf2_read_debug)
9369 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9370 kind, dwo_name, hex_string (signature));
9373 complaint (&symfile_complaints,
9374 _("Could not find DWO %s referenced by CU at offset 0x%x"
9376 kind, this_unit->offset.sect_off, objfile->name);
9380 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9381 See lookup_dwo_cutu_unit for details. */
9383 static struct dwo_unit *
9384 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9385 const char *dwo_name, const char *comp_dir,
9388 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9391 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9392 See lookup_dwo_cutu_unit for details. */
9394 static struct dwo_unit *
9395 lookup_dwo_type_unit (struct signatured_type *this_tu,
9396 const char *dwo_name, const char *comp_dir)
9398 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9401 /* Free all resources associated with DWO_FILE.
9402 Close the DWO file and munmap the sections.
9403 All memory should be on the objfile obstack. */
9406 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9409 struct dwarf2_section_info *section;
9411 /* Note: dbfd is NULL for virtual DWO files. */
9412 gdb_bfd_unref (dwo_file->dbfd);
9414 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9417 /* Wrapper for free_dwo_file for use in cleanups. */
9420 free_dwo_file_cleanup (void *arg)
9422 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9423 struct objfile *objfile = dwarf2_per_objfile->objfile;
9425 free_dwo_file (dwo_file, objfile);
9428 /* Traversal function for free_dwo_files. */
9431 free_dwo_file_from_slot (void **slot, void *info)
9433 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9434 struct objfile *objfile = (struct objfile *) info;
9436 free_dwo_file (dwo_file, objfile);
9441 /* Free all resources associated with DWO_FILES. */
9444 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9446 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9449 /* Read in various DIEs. */
9451 /* qsort helper for inherit_abstract_dies. */
9454 unsigned_int_compar (const void *ap, const void *bp)
9456 unsigned int a = *(unsigned int *) ap;
9457 unsigned int b = *(unsigned int *) bp;
9459 return (a > b) - (b > a);
9462 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9463 Inherit only the children of the DW_AT_abstract_origin DIE not being
9464 already referenced by DW_AT_abstract_origin from the children of the
9468 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9470 struct die_info *child_die;
9471 unsigned die_children_count;
9472 /* CU offsets which were referenced by children of the current DIE. */
9473 sect_offset *offsets;
9474 sect_offset *offsets_end, *offsetp;
9475 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9476 struct die_info *origin_die;
9477 /* Iterator of the ORIGIN_DIE children. */
9478 struct die_info *origin_child_die;
9479 struct cleanup *cleanups;
9480 struct attribute *attr;
9481 struct dwarf2_cu *origin_cu;
9482 struct pending **origin_previous_list_in_scope;
9484 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9488 /* Note that following die references may follow to a die in a
9492 origin_die = follow_die_ref (die, attr, &origin_cu);
9494 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9496 origin_previous_list_in_scope = origin_cu->list_in_scope;
9497 origin_cu->list_in_scope = cu->list_in_scope;
9499 if (die->tag != origin_die->tag
9500 && !(die->tag == DW_TAG_inlined_subroutine
9501 && origin_die->tag == DW_TAG_subprogram))
9502 complaint (&symfile_complaints,
9503 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9504 die->offset.sect_off, origin_die->offset.sect_off);
9506 child_die = die->child;
9507 die_children_count = 0;
9508 while (child_die && child_die->tag)
9510 child_die = sibling_die (child_die);
9511 die_children_count++;
9513 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9514 cleanups = make_cleanup (xfree, offsets);
9516 offsets_end = offsets;
9517 child_die = die->child;
9518 while (child_die && child_die->tag)
9520 /* For each CHILD_DIE, find the corresponding child of
9521 ORIGIN_DIE. If there is more than one layer of
9522 DW_AT_abstract_origin, follow them all; there shouldn't be,
9523 but GCC versions at least through 4.4 generate this (GCC PR
9525 struct die_info *child_origin_die = child_die;
9526 struct dwarf2_cu *child_origin_cu = cu;
9530 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9534 child_origin_die = follow_die_ref (child_origin_die, attr,
9538 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9539 counterpart may exist. */
9540 if (child_origin_die != child_die)
9542 if (child_die->tag != child_origin_die->tag
9543 && !(child_die->tag == DW_TAG_inlined_subroutine
9544 && child_origin_die->tag == DW_TAG_subprogram))
9545 complaint (&symfile_complaints,
9546 _("Child DIE 0x%x and its abstract origin 0x%x have "
9547 "different tags"), child_die->offset.sect_off,
9548 child_origin_die->offset.sect_off);
9549 if (child_origin_die->parent != origin_die)
9550 complaint (&symfile_complaints,
9551 _("Child DIE 0x%x and its abstract origin 0x%x have "
9552 "different parents"), child_die->offset.sect_off,
9553 child_origin_die->offset.sect_off);
9555 *offsets_end++ = child_origin_die->offset;
9557 child_die = sibling_die (child_die);
9559 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9560 unsigned_int_compar);
9561 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9562 if (offsetp[-1].sect_off == offsetp->sect_off)
9563 complaint (&symfile_complaints,
9564 _("Multiple children of DIE 0x%x refer "
9565 "to DIE 0x%x as their abstract origin"),
9566 die->offset.sect_off, offsetp->sect_off);
9569 origin_child_die = origin_die->child;
9570 while (origin_child_die && origin_child_die->tag)
9572 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9573 while (offsetp < offsets_end
9574 && offsetp->sect_off < origin_child_die->offset.sect_off)
9576 if (offsetp >= offsets_end
9577 || offsetp->sect_off > origin_child_die->offset.sect_off)
9579 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9580 process_die (origin_child_die, origin_cu);
9582 origin_child_die = sibling_die (origin_child_die);
9584 origin_cu->list_in_scope = origin_previous_list_in_scope;
9586 do_cleanups (cleanups);
9590 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
9592 struct objfile *objfile = cu->objfile;
9593 struct context_stack *new;
9596 struct die_info *child_die;
9597 struct attribute *attr, *call_line, *call_file;
9600 struct block *block;
9601 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
9602 VEC (symbolp) *template_args = NULL;
9603 struct template_symbol *templ_func = NULL;
9607 /* If we do not have call site information, we can't show the
9608 caller of this inlined function. That's too confusing, so
9609 only use the scope for local variables. */
9610 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
9611 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
9612 if (call_line == NULL || call_file == NULL)
9614 read_lexical_block_scope (die, cu);
9619 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9621 name = dwarf2_name (die, cu);
9623 /* Ignore functions with missing or empty names. These are actually
9624 illegal according to the DWARF standard. */
9627 complaint (&symfile_complaints,
9628 _("missing name for subprogram DIE at %d"),
9629 die->offset.sect_off);
9633 /* Ignore functions with missing or invalid low and high pc attributes. */
9634 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9636 attr = dwarf2_attr (die, DW_AT_external, cu);
9637 if (!attr || !DW_UNSND (attr))
9638 complaint (&symfile_complaints,
9639 _("cannot get low and high bounds "
9640 "for subprogram DIE at %d"),
9641 die->offset.sect_off);
9648 /* If we have any template arguments, then we must allocate a
9649 different sort of symbol. */
9650 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
9652 if (child_die->tag == DW_TAG_template_type_param
9653 || child_die->tag == DW_TAG_template_value_param)
9655 templ_func = allocate_template_symbol (objfile);
9656 templ_func->base.is_cplus_template_function = 1;
9661 new = push_context (0, lowpc);
9662 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
9663 (struct symbol *) templ_func);
9665 /* If there is a location expression for DW_AT_frame_base, record
9667 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
9669 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
9671 cu->list_in_scope = &local_symbols;
9673 if (die->child != NULL)
9675 child_die = die->child;
9676 while (child_die && child_die->tag)
9678 if (child_die->tag == DW_TAG_template_type_param
9679 || child_die->tag == DW_TAG_template_value_param)
9681 struct symbol *arg = new_symbol (child_die, NULL, cu);
9684 VEC_safe_push (symbolp, template_args, arg);
9687 process_die (child_die, cu);
9688 child_die = sibling_die (child_die);
9692 inherit_abstract_dies (die, cu);
9694 /* If we have a DW_AT_specification, we might need to import using
9695 directives from the context of the specification DIE. See the
9696 comment in determine_prefix. */
9697 if (cu->language == language_cplus
9698 && dwarf2_attr (die, DW_AT_specification, cu))
9700 struct dwarf2_cu *spec_cu = cu;
9701 struct die_info *spec_die = die_specification (die, &spec_cu);
9705 child_die = spec_die->child;
9706 while (child_die && child_die->tag)
9708 if (child_die->tag == DW_TAG_imported_module)
9709 process_die (child_die, spec_cu);
9710 child_die = sibling_die (child_die);
9713 /* In some cases, GCC generates specification DIEs that
9714 themselves contain DW_AT_specification attributes. */
9715 spec_die = die_specification (spec_die, &spec_cu);
9719 new = pop_context ();
9720 /* Make a block for the local symbols within. */
9721 block = finish_block (new->name, &local_symbols, new->old_blocks,
9722 lowpc, highpc, objfile);
9724 /* For C++, set the block's scope. */
9725 if ((cu->language == language_cplus || cu->language == language_fortran)
9726 && cu->processing_has_namespace_info)
9727 block_set_scope (block, determine_prefix (die, cu),
9728 &objfile->objfile_obstack);
9730 /* If we have address ranges, record them. */
9731 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9733 /* Attach template arguments to function. */
9734 if (! VEC_empty (symbolp, template_args))
9736 gdb_assert (templ_func != NULL);
9738 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
9739 templ_func->template_arguments
9740 = obstack_alloc (&objfile->objfile_obstack,
9741 (templ_func->n_template_arguments
9742 * sizeof (struct symbol *)));
9743 memcpy (templ_func->template_arguments,
9744 VEC_address (symbolp, template_args),
9745 (templ_func->n_template_arguments * sizeof (struct symbol *)));
9746 VEC_free (symbolp, template_args);
9749 /* In C++, we can have functions nested inside functions (e.g., when
9750 a function declares a class that has methods). This means that
9751 when we finish processing a function scope, we may need to go
9752 back to building a containing block's symbol lists. */
9753 local_symbols = new->locals;
9754 using_directives = new->using_directives;
9756 /* If we've finished processing a top-level function, subsequent
9757 symbols go in the file symbol list. */
9758 if (outermost_context_p ())
9759 cu->list_in_scope = &file_symbols;
9762 /* Process all the DIES contained within a lexical block scope. Start
9763 a new scope, process the dies, and then close the scope. */
9766 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
9768 struct objfile *objfile = cu->objfile;
9769 struct context_stack *new;
9770 CORE_ADDR lowpc, highpc;
9771 struct die_info *child_die;
9774 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9776 /* Ignore blocks with missing or invalid low and high pc attributes. */
9777 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
9778 as multiple lexical blocks? Handling children in a sane way would
9779 be nasty. Might be easier to properly extend generic blocks to
9781 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9786 push_context (0, lowpc);
9787 if (die->child != NULL)
9789 child_die = die->child;
9790 while (child_die && child_die->tag)
9792 process_die (child_die, cu);
9793 child_die = sibling_die (child_die);
9796 new = pop_context ();
9798 if (local_symbols != NULL || using_directives != NULL)
9801 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
9804 /* Note that recording ranges after traversing children, as we
9805 do here, means that recording a parent's ranges entails
9806 walking across all its children's ranges as they appear in
9807 the address map, which is quadratic behavior.
9809 It would be nicer to record the parent's ranges before
9810 traversing its children, simply overriding whatever you find
9811 there. But since we don't even decide whether to create a
9812 block until after we've traversed its children, that's hard
9814 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9816 local_symbols = new->locals;
9817 using_directives = new->using_directives;
9820 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
9823 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
9825 struct objfile *objfile = cu->objfile;
9826 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9827 CORE_ADDR pc, baseaddr;
9828 struct attribute *attr;
9829 struct call_site *call_site, call_site_local;
9832 struct die_info *child_die;
9834 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9836 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
9839 complaint (&symfile_complaints,
9840 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
9841 "DIE 0x%x [in module %s]"),
9842 die->offset.sect_off, objfile->name);
9845 pc = DW_ADDR (attr) + baseaddr;
9847 if (cu->call_site_htab == NULL)
9848 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
9849 NULL, &objfile->objfile_obstack,
9850 hashtab_obstack_allocate, NULL);
9851 call_site_local.pc = pc;
9852 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
9855 complaint (&symfile_complaints,
9856 _("Duplicate PC %s for DW_TAG_GNU_call_site "
9857 "DIE 0x%x [in module %s]"),
9858 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
9862 /* Count parameters at the caller. */
9865 for (child_die = die->child; child_die && child_die->tag;
9866 child_die = sibling_die (child_die))
9868 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
9870 complaint (&symfile_complaints,
9871 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
9872 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9873 child_die->tag, child_die->offset.sect_off, objfile->name);
9880 call_site = obstack_alloc (&objfile->objfile_obstack,
9881 (sizeof (*call_site)
9882 + (sizeof (*call_site->parameter)
9885 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
9888 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
9890 struct die_info *func_die;
9892 /* Skip also over DW_TAG_inlined_subroutine. */
9893 for (func_die = die->parent;
9894 func_die && func_die->tag != DW_TAG_subprogram
9895 && func_die->tag != DW_TAG_subroutine_type;
9896 func_die = func_die->parent);
9898 /* DW_AT_GNU_all_call_sites is a superset
9899 of DW_AT_GNU_all_tail_call_sites. */
9901 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
9902 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
9904 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
9905 not complete. But keep CALL_SITE for look ups via call_site_htab,
9906 both the initial caller containing the real return address PC and
9907 the final callee containing the current PC of a chain of tail
9908 calls do not need to have the tail call list complete. But any
9909 function candidate for a virtual tail call frame searched via
9910 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
9911 determined unambiguously. */
9915 struct type *func_type = NULL;
9918 func_type = get_die_type (func_die, cu);
9919 if (func_type != NULL)
9921 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
9923 /* Enlist this call site to the function. */
9924 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
9925 TYPE_TAIL_CALL_LIST (func_type) = call_site;
9928 complaint (&symfile_complaints,
9929 _("Cannot find function owning DW_TAG_GNU_call_site "
9930 "DIE 0x%x [in module %s]"),
9931 die->offset.sect_off, objfile->name);
9935 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
9937 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9938 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
9939 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
9940 /* Keep NULL DWARF_BLOCK. */;
9941 else if (attr_form_is_block (attr))
9943 struct dwarf2_locexpr_baton *dlbaton;
9945 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
9946 dlbaton->data = DW_BLOCK (attr)->data;
9947 dlbaton->size = DW_BLOCK (attr)->size;
9948 dlbaton->per_cu = cu->per_cu;
9950 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
9952 else if (is_ref_attr (attr))
9954 struct dwarf2_cu *target_cu = cu;
9955 struct die_info *target_die;
9957 target_die = follow_die_ref (die, attr, &target_cu);
9958 gdb_assert (target_cu->objfile == objfile);
9959 if (die_is_declaration (target_die, target_cu))
9961 const char *target_physname = NULL;
9962 struct attribute *target_attr;
9964 /* Prefer the mangled name; otherwise compute the demangled one. */
9965 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
9966 if (target_attr == NULL)
9967 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
9969 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
9970 target_physname = DW_STRING (target_attr);
9972 target_physname = dwarf2_physname (NULL, target_die, target_cu);
9973 if (target_physname == NULL)
9974 complaint (&symfile_complaints,
9975 _("DW_AT_GNU_call_site_target target DIE has invalid "
9976 "physname, for referencing DIE 0x%x [in module %s]"),
9977 die->offset.sect_off, objfile->name);
9979 SET_FIELD_PHYSNAME (call_site->target, target_physname);
9985 /* DW_AT_entry_pc should be preferred. */
9986 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
9987 complaint (&symfile_complaints,
9988 _("DW_AT_GNU_call_site_target target DIE has invalid "
9989 "low pc, for referencing DIE 0x%x [in module %s]"),
9990 die->offset.sect_off, objfile->name);
9992 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
9996 complaint (&symfile_complaints,
9997 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
9998 "block nor reference, for DIE 0x%x [in module %s]"),
9999 die->offset.sect_off, objfile->name);
10001 call_site->per_cu = cu->per_cu;
10003 for (child_die = die->child;
10004 child_die && child_die->tag;
10005 child_die = sibling_die (child_die))
10007 struct call_site_parameter *parameter;
10008 struct attribute *loc, *origin;
10010 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10012 /* Already printed the complaint above. */
10016 gdb_assert (call_site->parameter_count < nparams);
10017 parameter = &call_site->parameter[call_site->parameter_count];
10019 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10020 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10021 register is contained in DW_AT_GNU_call_site_value. */
10023 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10024 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10025 if (loc == NULL && origin != NULL && is_ref_attr (origin))
10027 sect_offset offset;
10029 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10030 offset = dwarf2_get_ref_die_offset (origin);
10031 if (!offset_in_cu_p (&cu->header, offset))
10033 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10034 binding can be done only inside one CU. Such referenced DIE
10035 therefore cannot be even moved to DW_TAG_partial_unit. */
10036 complaint (&symfile_complaints,
10037 _("DW_AT_abstract_origin offset is not in CU for "
10038 "DW_TAG_GNU_call_site child DIE 0x%x "
10040 child_die->offset.sect_off, objfile->name);
10043 parameter->u.param_offset.cu_off = (offset.sect_off
10044 - cu->header.offset.sect_off);
10046 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10048 complaint (&symfile_complaints,
10049 _("No DW_FORM_block* DW_AT_location for "
10050 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10051 child_die->offset.sect_off, objfile->name);
10056 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10057 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10058 if (parameter->u.dwarf_reg != -1)
10059 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10060 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10061 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10062 ¶meter->u.fb_offset))
10063 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10066 complaint (&symfile_complaints,
10067 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10068 "for DW_FORM_block* DW_AT_location is supported for "
10069 "DW_TAG_GNU_call_site child DIE 0x%x "
10071 child_die->offset.sect_off, objfile->name);
10076 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10077 if (!attr_form_is_block (attr))
10079 complaint (&symfile_complaints,
10080 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10081 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10082 child_die->offset.sect_off, objfile->name);
10085 parameter->value = DW_BLOCK (attr)->data;
10086 parameter->value_size = DW_BLOCK (attr)->size;
10088 /* Parameters are not pre-cleared by memset above. */
10089 parameter->data_value = NULL;
10090 parameter->data_value_size = 0;
10091 call_site->parameter_count++;
10093 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10096 if (!attr_form_is_block (attr))
10097 complaint (&symfile_complaints,
10098 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10099 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10100 child_die->offset.sect_off, objfile->name);
10103 parameter->data_value = DW_BLOCK (attr)->data;
10104 parameter->data_value_size = DW_BLOCK (attr)->size;
10110 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10111 Return 1 if the attributes are present and valid, otherwise, return 0.
10112 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10115 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10116 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10117 struct partial_symtab *ranges_pst)
10119 struct objfile *objfile = cu->objfile;
10120 struct comp_unit_head *cu_header = &cu->header;
10121 bfd *obfd = objfile->obfd;
10122 unsigned int addr_size = cu_header->addr_size;
10123 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10124 /* Base address selection entry. */
10127 unsigned int dummy;
10128 const gdb_byte *buffer;
10132 CORE_ADDR high = 0;
10133 CORE_ADDR baseaddr;
10135 found_base = cu->base_known;
10136 base = cu->base_address;
10138 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10139 if (offset >= dwarf2_per_objfile->ranges.size)
10141 complaint (&symfile_complaints,
10142 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10146 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10148 /* Read in the largest possible address. */
10149 marker = read_address (obfd, buffer, cu, &dummy);
10150 if ((marker & mask) == mask)
10152 /* If we found the largest possible address, then
10153 read the base address. */
10154 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10155 buffer += 2 * addr_size;
10156 offset += 2 * addr_size;
10162 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10166 CORE_ADDR range_beginning, range_end;
10168 range_beginning = read_address (obfd, buffer, cu, &dummy);
10169 buffer += addr_size;
10170 range_end = read_address (obfd, buffer, cu, &dummy);
10171 buffer += addr_size;
10172 offset += 2 * addr_size;
10174 /* An end of list marker is a pair of zero addresses. */
10175 if (range_beginning == 0 && range_end == 0)
10176 /* Found the end of list entry. */
10179 /* Each base address selection entry is a pair of 2 values.
10180 The first is the largest possible address, the second is
10181 the base address. Check for a base address here. */
10182 if ((range_beginning & mask) == mask)
10184 /* If we found the largest possible address, then
10185 read the base address. */
10186 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10193 /* We have no valid base address for the ranges
10195 complaint (&symfile_complaints,
10196 _("Invalid .debug_ranges data (no base address)"));
10200 if (range_beginning > range_end)
10202 /* Inverted range entries are invalid. */
10203 complaint (&symfile_complaints,
10204 _("Invalid .debug_ranges data (inverted range)"));
10208 /* Empty range entries have no effect. */
10209 if (range_beginning == range_end)
10212 range_beginning += base;
10215 /* A not-uncommon case of bad debug info.
10216 Don't pollute the addrmap with bad data. */
10217 if (range_beginning + baseaddr == 0
10218 && !dwarf2_per_objfile->has_section_at_zero)
10220 complaint (&symfile_complaints,
10221 _(".debug_ranges entry has start address of zero"
10222 " [in module %s]"), objfile->name);
10226 if (ranges_pst != NULL)
10227 addrmap_set_empty (objfile->psymtabs_addrmap,
10228 range_beginning + baseaddr,
10229 range_end - 1 + baseaddr,
10232 /* FIXME: This is recording everything as a low-high
10233 segment of consecutive addresses. We should have a
10234 data structure for discontiguous block ranges
10238 low = range_beginning;
10244 if (range_beginning < low)
10245 low = range_beginning;
10246 if (range_end > high)
10252 /* If the first entry is an end-of-list marker, the range
10253 describes an empty scope, i.e. no instructions. */
10259 *high_return = high;
10263 /* Get low and high pc attributes from a die. Return 1 if the attributes
10264 are present and valid, otherwise, return 0. Return -1 if the range is
10265 discontinuous, i.e. derived from DW_AT_ranges information. */
10268 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10269 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10270 struct partial_symtab *pst)
10272 struct attribute *attr;
10273 struct attribute *attr_high;
10275 CORE_ADDR high = 0;
10278 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10281 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10284 low = DW_ADDR (attr);
10285 if (attr_high->form == DW_FORM_addr
10286 || attr_high->form == DW_FORM_GNU_addr_index)
10287 high = DW_ADDR (attr_high);
10289 high = low + DW_UNSND (attr_high);
10292 /* Found high w/o low attribute. */
10295 /* Found consecutive range of addresses. */
10300 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10303 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10304 We take advantage of the fact that DW_AT_ranges does not appear
10305 in DW_TAG_compile_unit of DWO files. */
10306 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10307 unsigned int ranges_offset = (DW_UNSND (attr)
10308 + (need_ranges_base
10312 /* Value of the DW_AT_ranges attribute is the offset in the
10313 .debug_ranges section. */
10314 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10316 /* Found discontinuous range of addresses. */
10321 /* read_partial_die has also the strict LOW < HIGH requirement. */
10325 /* When using the GNU linker, .gnu.linkonce. sections are used to
10326 eliminate duplicate copies of functions and vtables and such.
10327 The linker will arbitrarily choose one and discard the others.
10328 The AT_*_pc values for such functions refer to local labels in
10329 these sections. If the section from that file was discarded, the
10330 labels are not in the output, so the relocs get a value of 0.
10331 If this is a discarded function, mark the pc bounds as invalid,
10332 so that GDB will ignore it. */
10333 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10342 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10343 its low and high PC addresses. Do nothing if these addresses could not
10344 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10345 and HIGHPC to the high address if greater than HIGHPC. */
10348 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10349 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10350 struct dwarf2_cu *cu)
10352 CORE_ADDR low, high;
10353 struct die_info *child = die->child;
10355 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10357 *lowpc = min (*lowpc, low);
10358 *highpc = max (*highpc, high);
10361 /* If the language does not allow nested subprograms (either inside
10362 subprograms or lexical blocks), we're done. */
10363 if (cu->language != language_ada)
10366 /* Check all the children of the given DIE. If it contains nested
10367 subprograms, then check their pc bounds. Likewise, we need to
10368 check lexical blocks as well, as they may also contain subprogram
10370 while (child && child->tag)
10372 if (child->tag == DW_TAG_subprogram
10373 || child->tag == DW_TAG_lexical_block)
10374 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10375 child = sibling_die (child);
10379 /* Get the low and high pc's represented by the scope DIE, and store
10380 them in *LOWPC and *HIGHPC. If the correct values can't be
10381 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10384 get_scope_pc_bounds (struct die_info *die,
10385 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10386 struct dwarf2_cu *cu)
10388 CORE_ADDR best_low = (CORE_ADDR) -1;
10389 CORE_ADDR best_high = (CORE_ADDR) 0;
10390 CORE_ADDR current_low, current_high;
10392 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10394 best_low = current_low;
10395 best_high = current_high;
10399 struct die_info *child = die->child;
10401 while (child && child->tag)
10403 switch (child->tag) {
10404 case DW_TAG_subprogram:
10405 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10407 case DW_TAG_namespace:
10408 case DW_TAG_module:
10409 /* FIXME: carlton/2004-01-16: Should we do this for
10410 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10411 that current GCC's always emit the DIEs corresponding
10412 to definitions of methods of classes as children of a
10413 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10414 the DIEs giving the declarations, which could be
10415 anywhere). But I don't see any reason why the
10416 standards says that they have to be there. */
10417 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10419 if (current_low != ((CORE_ADDR) -1))
10421 best_low = min (best_low, current_low);
10422 best_high = max (best_high, current_high);
10430 child = sibling_die (child);
10435 *highpc = best_high;
10438 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10442 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10443 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10445 struct objfile *objfile = cu->objfile;
10446 struct attribute *attr;
10447 struct attribute *attr_high;
10449 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10452 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10455 CORE_ADDR low = DW_ADDR (attr);
10457 if (attr_high->form == DW_FORM_addr
10458 || attr_high->form == DW_FORM_GNU_addr_index)
10459 high = DW_ADDR (attr_high);
10461 high = low + DW_UNSND (attr_high);
10463 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10467 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10470 bfd *obfd = objfile->obfd;
10471 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10472 We take advantage of the fact that DW_AT_ranges does not appear
10473 in DW_TAG_compile_unit of DWO files. */
10474 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10476 /* The value of the DW_AT_ranges attribute is the offset of the
10477 address range list in the .debug_ranges section. */
10478 unsigned long offset = (DW_UNSND (attr)
10479 + (need_ranges_base ? cu->ranges_base : 0));
10480 const gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset;
10482 /* For some target architectures, but not others, the
10483 read_address function sign-extends the addresses it returns.
10484 To recognize base address selection entries, we need a
10486 unsigned int addr_size = cu->header.addr_size;
10487 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10489 /* The base address, to which the next pair is relative. Note
10490 that this 'base' is a DWARF concept: most entries in a range
10491 list are relative, to reduce the number of relocs against the
10492 debugging information. This is separate from this function's
10493 'baseaddr' argument, which GDB uses to relocate debugging
10494 information from a shared library based on the address at
10495 which the library was loaded. */
10496 CORE_ADDR base = cu->base_address;
10497 int base_known = cu->base_known;
10499 gdb_assert (dwarf2_per_objfile->ranges.readin);
10500 if (offset >= dwarf2_per_objfile->ranges.size)
10502 complaint (&symfile_complaints,
10503 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10510 unsigned int bytes_read;
10511 CORE_ADDR start, end;
10513 start = read_address (obfd, buffer, cu, &bytes_read);
10514 buffer += bytes_read;
10515 end = read_address (obfd, buffer, cu, &bytes_read);
10516 buffer += bytes_read;
10518 /* Did we find the end of the range list? */
10519 if (start == 0 && end == 0)
10522 /* Did we find a base address selection entry? */
10523 else if ((start & base_select_mask) == base_select_mask)
10529 /* We found an ordinary address range. */
10534 complaint (&symfile_complaints,
10535 _("Invalid .debug_ranges data "
10536 "(no base address)"));
10542 /* Inverted range entries are invalid. */
10543 complaint (&symfile_complaints,
10544 _("Invalid .debug_ranges data "
10545 "(inverted range)"));
10549 /* Empty range entries have no effect. */
10553 start += base + baseaddr;
10554 end += base + baseaddr;
10556 /* A not-uncommon case of bad debug info.
10557 Don't pollute the addrmap with bad data. */
10558 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10560 complaint (&symfile_complaints,
10561 _(".debug_ranges entry has start address of zero"
10562 " [in module %s]"), objfile->name);
10566 record_block_range (block, start, end - 1);
10572 /* Check whether the producer field indicates either of GCC < 4.6, or the
10573 Intel C/C++ compiler, and cache the result in CU. */
10576 check_producer (struct dwarf2_cu *cu)
10579 int major, minor, release;
10581 if (cu->producer == NULL)
10583 /* For unknown compilers expect their behavior is DWARF version
10586 GCC started to support .debug_types sections by -gdwarf-4 since
10587 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
10588 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
10589 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
10590 interpreted incorrectly by GDB now - GCC PR debug/48229. */
10592 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
10594 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
10596 cs = &cu->producer[strlen ("GNU ")];
10597 while (*cs && !isdigit (*cs))
10599 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
10601 /* Not recognized as GCC. */
10605 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
10606 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
10609 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
10610 cu->producer_is_icc = 1;
10613 /* For other non-GCC compilers, expect their behavior is DWARF version
10617 cu->checked_producer = 1;
10620 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
10621 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
10622 during 4.6.0 experimental. */
10625 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
10627 if (!cu->checked_producer)
10628 check_producer (cu);
10630 return cu->producer_is_gxx_lt_4_6;
10633 /* Return the default accessibility type if it is not overriden by
10634 DW_AT_accessibility. */
10636 static enum dwarf_access_attribute
10637 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
10639 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
10641 /* The default DWARF 2 accessibility for members is public, the default
10642 accessibility for inheritance is private. */
10644 if (die->tag != DW_TAG_inheritance)
10645 return DW_ACCESS_public;
10647 return DW_ACCESS_private;
10651 /* DWARF 3+ defines the default accessibility a different way. The same
10652 rules apply now for DW_TAG_inheritance as for the members and it only
10653 depends on the container kind. */
10655 if (die->parent->tag == DW_TAG_class_type)
10656 return DW_ACCESS_private;
10658 return DW_ACCESS_public;
10662 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
10663 offset. If the attribute was not found return 0, otherwise return
10664 1. If it was found but could not properly be handled, set *OFFSET
10668 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
10671 struct attribute *attr;
10673 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
10678 /* Note that we do not check for a section offset first here.
10679 This is because DW_AT_data_member_location is new in DWARF 4,
10680 so if we see it, we can assume that a constant form is really
10681 a constant and not a section offset. */
10682 if (attr_form_is_constant (attr))
10683 *offset = dwarf2_get_attr_constant_value (attr, 0);
10684 else if (attr_form_is_section_offset (attr))
10685 dwarf2_complex_location_expr_complaint ();
10686 else if (attr_form_is_block (attr))
10687 *offset = decode_locdesc (DW_BLOCK (attr), cu);
10689 dwarf2_complex_location_expr_complaint ();
10697 /* Add an aggregate field to the field list. */
10700 dwarf2_add_field (struct field_info *fip, struct die_info *die,
10701 struct dwarf2_cu *cu)
10703 struct objfile *objfile = cu->objfile;
10704 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10705 struct nextfield *new_field;
10706 struct attribute *attr;
10708 const char *fieldname = "";
10710 /* Allocate a new field list entry and link it in. */
10711 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
10712 make_cleanup (xfree, new_field);
10713 memset (new_field, 0, sizeof (struct nextfield));
10715 if (die->tag == DW_TAG_inheritance)
10717 new_field->next = fip->baseclasses;
10718 fip->baseclasses = new_field;
10722 new_field->next = fip->fields;
10723 fip->fields = new_field;
10727 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
10729 new_field->accessibility = DW_UNSND (attr);
10731 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
10732 if (new_field->accessibility != DW_ACCESS_public)
10733 fip->non_public_fields = 1;
10735 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
10737 new_field->virtuality = DW_UNSND (attr);
10739 new_field->virtuality = DW_VIRTUALITY_none;
10741 fp = &new_field->field;
10743 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
10747 /* Data member other than a C++ static data member. */
10749 /* Get type of field. */
10750 fp->type = die_type (die, cu);
10752 SET_FIELD_BITPOS (*fp, 0);
10754 /* Get bit size of field (zero if none). */
10755 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
10758 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
10762 FIELD_BITSIZE (*fp) = 0;
10765 /* Get bit offset of field. */
10766 if (handle_data_member_location (die, cu, &offset))
10767 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10768 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
10771 if (gdbarch_bits_big_endian (gdbarch))
10773 /* For big endian bits, the DW_AT_bit_offset gives the
10774 additional bit offset from the MSB of the containing
10775 anonymous object to the MSB of the field. We don't
10776 have to do anything special since we don't need to
10777 know the size of the anonymous object. */
10778 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
10782 /* For little endian bits, compute the bit offset to the
10783 MSB of the anonymous object, subtract off the number of
10784 bits from the MSB of the field to the MSB of the
10785 object, and then subtract off the number of bits of
10786 the field itself. The result is the bit offset of
10787 the LSB of the field. */
10788 int anonymous_size;
10789 int bit_offset = DW_UNSND (attr);
10791 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
10794 /* The size of the anonymous object containing
10795 the bit field is explicit, so use the
10796 indicated size (in bytes). */
10797 anonymous_size = DW_UNSND (attr);
10801 /* The size of the anonymous object containing
10802 the bit field must be inferred from the type
10803 attribute of the data member containing the
10805 anonymous_size = TYPE_LENGTH (fp->type);
10807 SET_FIELD_BITPOS (*fp,
10808 (FIELD_BITPOS (*fp)
10809 + anonymous_size * bits_per_byte
10810 - bit_offset - FIELD_BITSIZE (*fp)));
10814 /* Get name of field. */
10815 fieldname = dwarf2_name (die, cu);
10816 if (fieldname == NULL)
10819 /* The name is already allocated along with this objfile, so we don't
10820 need to duplicate it for the type. */
10821 fp->name = fieldname;
10823 /* Change accessibility for artificial fields (e.g. virtual table
10824 pointer or virtual base class pointer) to private. */
10825 if (dwarf2_attr (die, DW_AT_artificial, cu))
10827 FIELD_ARTIFICIAL (*fp) = 1;
10828 new_field->accessibility = DW_ACCESS_private;
10829 fip->non_public_fields = 1;
10832 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
10834 /* C++ static member. */
10836 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
10837 is a declaration, but all versions of G++ as of this writing
10838 (so through at least 3.2.1) incorrectly generate
10839 DW_TAG_variable tags. */
10841 const char *physname;
10843 /* Get name of field. */
10844 fieldname = dwarf2_name (die, cu);
10845 if (fieldname == NULL)
10848 attr = dwarf2_attr (die, DW_AT_const_value, cu);
10850 /* Only create a symbol if this is an external value.
10851 new_symbol checks this and puts the value in the global symbol
10852 table, which we want. If it is not external, new_symbol
10853 will try to put the value in cu->list_in_scope which is wrong. */
10854 && dwarf2_flag_true_p (die, DW_AT_external, cu))
10856 /* A static const member, not much different than an enum as far as
10857 we're concerned, except that we can support more types. */
10858 new_symbol (die, NULL, cu);
10861 /* Get physical name. */
10862 physname = dwarf2_physname (fieldname, die, cu);
10864 /* The name is already allocated along with this objfile, so we don't
10865 need to duplicate it for the type. */
10866 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
10867 FIELD_TYPE (*fp) = die_type (die, cu);
10868 FIELD_NAME (*fp) = fieldname;
10870 else if (die->tag == DW_TAG_inheritance)
10874 /* C++ base class field. */
10875 if (handle_data_member_location (die, cu, &offset))
10876 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10877 FIELD_BITSIZE (*fp) = 0;
10878 FIELD_TYPE (*fp) = die_type (die, cu);
10879 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
10880 fip->nbaseclasses++;
10884 /* Add a typedef defined in the scope of the FIP's class. */
10887 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
10888 struct dwarf2_cu *cu)
10890 struct objfile *objfile = cu->objfile;
10891 struct typedef_field_list *new_field;
10892 struct attribute *attr;
10893 struct typedef_field *fp;
10894 char *fieldname = "";
10896 /* Allocate a new field list entry and link it in. */
10897 new_field = xzalloc (sizeof (*new_field));
10898 make_cleanup (xfree, new_field);
10900 gdb_assert (die->tag == DW_TAG_typedef);
10902 fp = &new_field->field;
10904 /* Get name of field. */
10905 fp->name = dwarf2_name (die, cu);
10906 if (fp->name == NULL)
10909 fp->type = read_type_die (die, cu);
10911 new_field->next = fip->typedef_field_list;
10912 fip->typedef_field_list = new_field;
10913 fip->typedef_field_list_count++;
10916 /* Create the vector of fields, and attach it to the type. */
10919 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
10920 struct dwarf2_cu *cu)
10922 int nfields = fip->nfields;
10924 /* Record the field count, allocate space for the array of fields,
10925 and create blank accessibility bitfields if necessary. */
10926 TYPE_NFIELDS (type) = nfields;
10927 TYPE_FIELDS (type) = (struct field *)
10928 TYPE_ALLOC (type, sizeof (struct field) * nfields);
10929 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
10931 if (fip->non_public_fields && cu->language != language_ada)
10933 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10935 TYPE_FIELD_PRIVATE_BITS (type) =
10936 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10937 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
10939 TYPE_FIELD_PROTECTED_BITS (type) =
10940 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10941 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
10943 TYPE_FIELD_IGNORE_BITS (type) =
10944 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10945 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
10948 /* If the type has baseclasses, allocate and clear a bit vector for
10949 TYPE_FIELD_VIRTUAL_BITS. */
10950 if (fip->nbaseclasses && cu->language != language_ada)
10952 int num_bytes = B_BYTES (fip->nbaseclasses);
10953 unsigned char *pointer;
10955 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10956 pointer = TYPE_ALLOC (type, num_bytes);
10957 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
10958 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
10959 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
10962 /* Copy the saved-up fields into the field vector. Start from the head of
10963 the list, adding to the tail of the field array, so that they end up in
10964 the same order in the array in which they were added to the list. */
10965 while (nfields-- > 0)
10967 struct nextfield *fieldp;
10971 fieldp = fip->fields;
10972 fip->fields = fieldp->next;
10976 fieldp = fip->baseclasses;
10977 fip->baseclasses = fieldp->next;
10980 TYPE_FIELD (type, nfields) = fieldp->field;
10981 switch (fieldp->accessibility)
10983 case DW_ACCESS_private:
10984 if (cu->language != language_ada)
10985 SET_TYPE_FIELD_PRIVATE (type, nfields);
10988 case DW_ACCESS_protected:
10989 if (cu->language != language_ada)
10990 SET_TYPE_FIELD_PROTECTED (type, nfields);
10993 case DW_ACCESS_public:
10997 /* Unknown accessibility. Complain and treat it as public. */
10999 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11000 fieldp->accessibility);
11004 if (nfields < fip->nbaseclasses)
11006 switch (fieldp->virtuality)
11008 case DW_VIRTUALITY_virtual:
11009 case DW_VIRTUALITY_pure_virtual:
11010 if (cu->language == language_ada)
11011 error (_("unexpected virtuality in component of Ada type"));
11012 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11019 /* Return true if this member function is a constructor, false
11023 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11025 const char *fieldname;
11026 const char *typename;
11029 if (die->parent == NULL)
11032 if (die->parent->tag != DW_TAG_structure_type
11033 && die->parent->tag != DW_TAG_union_type
11034 && die->parent->tag != DW_TAG_class_type)
11037 fieldname = dwarf2_name (die, cu);
11038 typename = dwarf2_name (die->parent, cu);
11039 if (fieldname == NULL || typename == NULL)
11042 len = strlen (fieldname);
11043 return (strncmp (fieldname, typename, len) == 0
11044 && (typename[len] == '\0' || typename[len] == '<'));
11047 /* Add a member function to the proper fieldlist. */
11050 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11051 struct type *type, struct dwarf2_cu *cu)
11053 struct objfile *objfile = cu->objfile;
11054 struct attribute *attr;
11055 struct fnfieldlist *flp;
11057 struct fn_field *fnp;
11058 const char *fieldname;
11059 struct nextfnfield *new_fnfield;
11060 struct type *this_type;
11061 enum dwarf_access_attribute accessibility;
11063 if (cu->language == language_ada)
11064 error (_("unexpected member function in Ada type"));
11066 /* Get name of member function. */
11067 fieldname = dwarf2_name (die, cu);
11068 if (fieldname == NULL)
11071 /* Look up member function name in fieldlist. */
11072 for (i = 0; i < fip->nfnfields; i++)
11074 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11078 /* Create new list element if necessary. */
11079 if (i < fip->nfnfields)
11080 flp = &fip->fnfieldlists[i];
11083 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11085 fip->fnfieldlists = (struct fnfieldlist *)
11086 xrealloc (fip->fnfieldlists,
11087 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11088 * sizeof (struct fnfieldlist));
11089 if (fip->nfnfields == 0)
11090 make_cleanup (free_current_contents, &fip->fnfieldlists);
11092 flp = &fip->fnfieldlists[fip->nfnfields];
11093 flp->name = fieldname;
11096 i = fip->nfnfields++;
11099 /* Create a new member function field and chain it to the field list
11101 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11102 make_cleanup (xfree, new_fnfield);
11103 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11104 new_fnfield->next = flp->head;
11105 flp->head = new_fnfield;
11108 /* Fill in the member function field info. */
11109 fnp = &new_fnfield->fnfield;
11111 /* Delay processing of the physname until later. */
11112 if (cu->language == language_cplus || cu->language == language_java)
11114 add_to_method_list (type, i, flp->length - 1, fieldname,
11119 const char *physname = dwarf2_physname (fieldname, die, cu);
11120 fnp->physname = physname ? physname : "";
11123 fnp->type = alloc_type (objfile);
11124 this_type = read_type_die (die, cu);
11125 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11127 int nparams = TYPE_NFIELDS (this_type);
11129 /* TYPE is the domain of this method, and THIS_TYPE is the type
11130 of the method itself (TYPE_CODE_METHOD). */
11131 smash_to_method_type (fnp->type, type,
11132 TYPE_TARGET_TYPE (this_type),
11133 TYPE_FIELDS (this_type),
11134 TYPE_NFIELDS (this_type),
11135 TYPE_VARARGS (this_type));
11137 /* Handle static member functions.
11138 Dwarf2 has no clean way to discern C++ static and non-static
11139 member functions. G++ helps GDB by marking the first
11140 parameter for non-static member functions (which is the this
11141 pointer) as artificial. We obtain this information from
11142 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11143 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11144 fnp->voffset = VOFFSET_STATIC;
11147 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11148 dwarf2_full_name (fieldname, die, cu));
11150 /* Get fcontext from DW_AT_containing_type if present. */
11151 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11152 fnp->fcontext = die_containing_type (die, cu);
11154 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11155 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11157 /* Get accessibility. */
11158 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11160 accessibility = DW_UNSND (attr);
11162 accessibility = dwarf2_default_access_attribute (die, cu);
11163 switch (accessibility)
11165 case DW_ACCESS_private:
11166 fnp->is_private = 1;
11168 case DW_ACCESS_protected:
11169 fnp->is_protected = 1;
11173 /* Check for artificial methods. */
11174 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11175 if (attr && DW_UNSND (attr) != 0)
11176 fnp->is_artificial = 1;
11178 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11180 /* Get index in virtual function table if it is a virtual member
11181 function. For older versions of GCC, this is an offset in the
11182 appropriate virtual table, as specified by DW_AT_containing_type.
11183 For everyone else, it is an expression to be evaluated relative
11184 to the object address. */
11186 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11189 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11191 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11193 /* Old-style GCC. */
11194 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11196 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11197 || (DW_BLOCK (attr)->size > 1
11198 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11199 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11201 struct dwarf_block blk;
11204 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11206 blk.size = DW_BLOCK (attr)->size - offset;
11207 blk.data = DW_BLOCK (attr)->data + offset;
11208 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11209 if ((fnp->voffset % cu->header.addr_size) != 0)
11210 dwarf2_complex_location_expr_complaint ();
11212 fnp->voffset /= cu->header.addr_size;
11216 dwarf2_complex_location_expr_complaint ();
11218 if (!fnp->fcontext)
11219 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11221 else if (attr_form_is_section_offset (attr))
11223 dwarf2_complex_location_expr_complaint ();
11227 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11233 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11234 if (attr && DW_UNSND (attr))
11236 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11237 complaint (&symfile_complaints,
11238 _("Member function \"%s\" (offset %d) is virtual "
11239 "but the vtable offset is not specified"),
11240 fieldname, die->offset.sect_off);
11241 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11242 TYPE_CPLUS_DYNAMIC (type) = 1;
11247 /* Create the vector of member function fields, and attach it to the type. */
11250 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11251 struct dwarf2_cu *cu)
11253 struct fnfieldlist *flp;
11256 if (cu->language == language_ada)
11257 error (_("unexpected member functions in Ada type"));
11259 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11260 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11261 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11263 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11265 struct nextfnfield *nfp = flp->head;
11266 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11269 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11270 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11271 fn_flp->fn_fields = (struct fn_field *)
11272 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11273 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11274 fn_flp->fn_fields[k] = nfp->fnfield;
11277 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11280 /* Returns non-zero if NAME is the name of a vtable member in CU's
11281 language, zero otherwise. */
11283 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11285 static const char vptr[] = "_vptr";
11286 static const char vtable[] = "vtable";
11288 /* Look for the C++ and Java forms of the vtable. */
11289 if ((cu->language == language_java
11290 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11291 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11292 && is_cplus_marker (name[sizeof (vptr) - 1])))
11298 /* GCC outputs unnamed structures that are really pointers to member
11299 functions, with the ABI-specified layout. If TYPE describes
11300 such a structure, smash it into a member function type.
11302 GCC shouldn't do this; it should just output pointer to member DIEs.
11303 This is GCC PR debug/28767. */
11306 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11308 struct type *pfn_type, *domain_type, *new_type;
11310 /* Check for a structure with no name and two children. */
11311 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11314 /* Check for __pfn and __delta members. */
11315 if (TYPE_FIELD_NAME (type, 0) == NULL
11316 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11317 || TYPE_FIELD_NAME (type, 1) == NULL
11318 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11321 /* Find the type of the method. */
11322 pfn_type = TYPE_FIELD_TYPE (type, 0);
11323 if (pfn_type == NULL
11324 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11325 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11328 /* Look for the "this" argument. */
11329 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11330 if (TYPE_NFIELDS (pfn_type) == 0
11331 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11332 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11335 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11336 new_type = alloc_type (objfile);
11337 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11338 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11339 TYPE_VARARGS (pfn_type));
11340 smash_to_methodptr_type (type, new_type);
11343 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11347 producer_is_icc (struct dwarf2_cu *cu)
11349 if (!cu->checked_producer)
11350 check_producer (cu);
11352 return cu->producer_is_icc;
11355 /* Called when we find the DIE that starts a structure or union scope
11356 (definition) to create a type for the structure or union. Fill in
11357 the type's name and general properties; the members will not be
11358 processed until process_structure_scope.
11360 NOTE: we need to call these functions regardless of whether or not the
11361 DIE has a DW_AT_name attribute, since it might be an anonymous
11362 structure or union. This gets the type entered into our set of
11363 user defined types.
11365 However, if the structure is incomplete (an opaque struct/union)
11366 then suppress creating a symbol table entry for it since gdb only
11367 wants to find the one with the complete definition. Note that if
11368 it is complete, we just call new_symbol, which does it's own
11369 checking about whether the struct/union is anonymous or not (and
11370 suppresses creating a symbol table entry itself). */
11372 static struct type *
11373 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11375 struct objfile *objfile = cu->objfile;
11377 struct attribute *attr;
11380 /* If the definition of this type lives in .debug_types, read that type.
11381 Don't follow DW_AT_specification though, that will take us back up
11382 the chain and we want to go down. */
11383 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11386 type = get_DW_AT_signature_type (die, attr, cu);
11388 /* The type's CU may not be the same as CU.
11389 Ensure TYPE is recorded with CU in die_type_hash. */
11390 return set_die_type (die, type, cu);
11393 type = alloc_type (objfile);
11394 INIT_CPLUS_SPECIFIC (type);
11396 name = dwarf2_name (die, cu);
11399 if (cu->language == language_cplus
11400 || cu->language == language_java)
11402 const char *full_name = dwarf2_full_name (name, die, cu);
11404 /* dwarf2_full_name might have already finished building the DIE's
11405 type. If so, there is no need to continue. */
11406 if (get_die_type (die, cu) != NULL)
11407 return get_die_type (die, cu);
11409 TYPE_TAG_NAME (type) = full_name;
11410 if (die->tag == DW_TAG_structure_type
11411 || die->tag == DW_TAG_class_type)
11412 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11416 /* The name is already allocated along with this objfile, so
11417 we don't need to duplicate it for the type. */
11418 TYPE_TAG_NAME (type) = name;
11419 if (die->tag == DW_TAG_class_type)
11420 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11424 if (die->tag == DW_TAG_structure_type)
11426 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11428 else if (die->tag == DW_TAG_union_type)
11430 TYPE_CODE (type) = TYPE_CODE_UNION;
11434 TYPE_CODE (type) = TYPE_CODE_CLASS;
11437 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11438 TYPE_DECLARED_CLASS (type) = 1;
11440 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11443 TYPE_LENGTH (type) = DW_UNSND (attr);
11447 TYPE_LENGTH (type) = 0;
11450 if (producer_is_icc (cu))
11452 /* ICC does not output the required DW_AT_declaration
11453 on incomplete types, but gives them a size of zero. */
11456 TYPE_STUB_SUPPORTED (type) = 1;
11458 if (die_is_declaration (die, cu))
11459 TYPE_STUB (type) = 1;
11460 else if (attr == NULL && die->child == NULL
11461 && producer_is_realview (cu->producer))
11462 /* RealView does not output the required DW_AT_declaration
11463 on incomplete types. */
11464 TYPE_STUB (type) = 1;
11466 /* We need to add the type field to the die immediately so we don't
11467 infinitely recurse when dealing with pointers to the structure
11468 type within the structure itself. */
11469 set_die_type (die, type, cu);
11471 /* set_die_type should be already done. */
11472 set_descriptive_type (type, die, cu);
11477 /* Finish creating a structure or union type, including filling in
11478 its members and creating a symbol for it. */
11481 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11483 struct objfile *objfile = cu->objfile;
11484 struct die_info *child_die = die->child;
11487 type = get_die_type (die, cu);
11489 type = read_structure_type (die, cu);
11491 if (die->child != NULL && ! die_is_declaration (die, cu))
11493 struct field_info fi;
11494 struct die_info *child_die;
11495 VEC (symbolp) *template_args = NULL;
11496 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11498 memset (&fi, 0, sizeof (struct field_info));
11500 child_die = die->child;
11502 while (child_die && child_die->tag)
11504 if (child_die->tag == DW_TAG_member
11505 || child_die->tag == DW_TAG_variable)
11507 /* NOTE: carlton/2002-11-05: A C++ static data member
11508 should be a DW_TAG_member that is a declaration, but
11509 all versions of G++ as of this writing (so through at
11510 least 3.2.1) incorrectly generate DW_TAG_variable
11511 tags for them instead. */
11512 dwarf2_add_field (&fi, child_die, cu);
11514 else if (child_die->tag == DW_TAG_subprogram)
11516 /* C++ member function. */
11517 dwarf2_add_member_fn (&fi, child_die, type, cu);
11519 else if (child_die->tag == DW_TAG_inheritance)
11521 /* C++ base class field. */
11522 dwarf2_add_field (&fi, child_die, cu);
11524 else if (child_die->tag == DW_TAG_typedef)
11525 dwarf2_add_typedef (&fi, child_die, cu);
11526 else if (child_die->tag == DW_TAG_template_type_param
11527 || child_die->tag == DW_TAG_template_value_param)
11529 struct symbol *arg = new_symbol (child_die, NULL, cu);
11532 VEC_safe_push (symbolp, template_args, arg);
11535 child_die = sibling_die (child_die);
11538 /* Attach template arguments to type. */
11539 if (! VEC_empty (symbolp, template_args))
11541 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11542 TYPE_N_TEMPLATE_ARGUMENTS (type)
11543 = VEC_length (symbolp, template_args);
11544 TYPE_TEMPLATE_ARGUMENTS (type)
11545 = obstack_alloc (&objfile->objfile_obstack,
11546 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11547 * sizeof (struct symbol *)));
11548 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11549 VEC_address (symbolp, template_args),
11550 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11551 * sizeof (struct symbol *)));
11552 VEC_free (symbolp, template_args);
11555 /* Attach fields and member functions to the type. */
11557 dwarf2_attach_fields_to_type (&fi, type, cu);
11560 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11562 /* Get the type which refers to the base class (possibly this
11563 class itself) which contains the vtable pointer for the current
11564 class from the DW_AT_containing_type attribute. This use of
11565 DW_AT_containing_type is a GNU extension. */
11567 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11569 struct type *t = die_containing_type (die, cu);
11571 TYPE_VPTR_BASETYPE (type) = t;
11576 /* Our own class provides vtbl ptr. */
11577 for (i = TYPE_NFIELDS (t) - 1;
11578 i >= TYPE_N_BASECLASSES (t);
11581 const char *fieldname = TYPE_FIELD_NAME (t, i);
11583 if (is_vtable_name (fieldname, cu))
11585 TYPE_VPTR_FIELDNO (type) = i;
11590 /* Complain if virtual function table field not found. */
11591 if (i < TYPE_N_BASECLASSES (t))
11592 complaint (&symfile_complaints,
11593 _("virtual function table pointer "
11594 "not found when defining class '%s'"),
11595 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
11600 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
11603 else if (cu->producer
11604 && strncmp (cu->producer,
11605 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
11607 /* The IBM XLC compiler does not provide direct indication
11608 of the containing type, but the vtable pointer is
11609 always named __vfp. */
11613 for (i = TYPE_NFIELDS (type) - 1;
11614 i >= TYPE_N_BASECLASSES (type);
11617 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
11619 TYPE_VPTR_FIELDNO (type) = i;
11620 TYPE_VPTR_BASETYPE (type) = type;
11627 /* Copy fi.typedef_field_list linked list elements content into the
11628 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
11629 if (fi.typedef_field_list)
11631 int i = fi.typedef_field_list_count;
11633 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11634 TYPE_TYPEDEF_FIELD_ARRAY (type)
11635 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
11636 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
11638 /* Reverse the list order to keep the debug info elements order. */
11641 struct typedef_field *dest, *src;
11643 dest = &TYPE_TYPEDEF_FIELD (type, i);
11644 src = &fi.typedef_field_list->field;
11645 fi.typedef_field_list = fi.typedef_field_list->next;
11650 do_cleanups (back_to);
11652 if (HAVE_CPLUS_STRUCT (type))
11653 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
11656 quirk_gcc_member_function_pointer (type, objfile);
11658 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
11659 snapshots) has been known to create a die giving a declaration
11660 for a class that has, as a child, a die giving a definition for a
11661 nested class. So we have to process our children even if the
11662 current die is a declaration. Normally, of course, a declaration
11663 won't have any children at all. */
11665 while (child_die != NULL && child_die->tag)
11667 if (child_die->tag == DW_TAG_member
11668 || child_die->tag == DW_TAG_variable
11669 || child_die->tag == DW_TAG_inheritance
11670 || child_die->tag == DW_TAG_template_value_param
11671 || child_die->tag == DW_TAG_template_type_param)
11676 process_die (child_die, cu);
11678 child_die = sibling_die (child_die);
11681 /* Do not consider external references. According to the DWARF standard,
11682 these DIEs are identified by the fact that they have no byte_size
11683 attribute, and a declaration attribute. */
11684 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
11685 || !die_is_declaration (die, cu))
11686 new_symbol (die, type, cu);
11689 /* Given a DW_AT_enumeration_type die, set its type. We do not
11690 complete the type's fields yet, or create any symbols. */
11692 static struct type *
11693 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
11695 struct objfile *objfile = cu->objfile;
11697 struct attribute *attr;
11700 /* If the definition of this type lives in .debug_types, read that type.
11701 Don't follow DW_AT_specification though, that will take us back up
11702 the chain and we want to go down. */
11703 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11706 type = get_DW_AT_signature_type (die, attr, cu);
11708 /* The type's CU may not be the same as CU.
11709 Ensure TYPE is recorded with CU in die_type_hash. */
11710 return set_die_type (die, type, cu);
11713 type = alloc_type (objfile);
11715 TYPE_CODE (type) = TYPE_CODE_ENUM;
11716 name = dwarf2_full_name (NULL, die, cu);
11718 TYPE_TAG_NAME (type) = name;
11720 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11723 TYPE_LENGTH (type) = DW_UNSND (attr);
11727 TYPE_LENGTH (type) = 0;
11730 /* The enumeration DIE can be incomplete. In Ada, any type can be
11731 declared as private in the package spec, and then defined only
11732 inside the package body. Such types are known as Taft Amendment
11733 Types. When another package uses such a type, an incomplete DIE
11734 may be generated by the compiler. */
11735 if (die_is_declaration (die, cu))
11736 TYPE_STUB (type) = 1;
11738 return set_die_type (die, type, cu);
11741 /* Given a pointer to a die which begins an enumeration, process all
11742 the dies that define the members of the enumeration, and create the
11743 symbol for the enumeration type.
11745 NOTE: We reverse the order of the element list. */
11748 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
11750 struct type *this_type;
11752 this_type = get_die_type (die, cu);
11753 if (this_type == NULL)
11754 this_type = read_enumeration_type (die, cu);
11756 if (die->child != NULL)
11758 struct die_info *child_die;
11759 struct symbol *sym;
11760 struct field *fields = NULL;
11761 int num_fields = 0;
11762 int unsigned_enum = 1;
11767 child_die = die->child;
11768 while (child_die && child_die->tag)
11770 if (child_die->tag != DW_TAG_enumerator)
11772 process_die (child_die, cu);
11776 name = dwarf2_name (child_die, cu);
11779 sym = new_symbol (child_die, this_type, cu);
11780 if (SYMBOL_VALUE (sym) < 0)
11785 else if ((mask & SYMBOL_VALUE (sym)) != 0)
11788 mask |= SYMBOL_VALUE (sym);
11790 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
11792 fields = (struct field *)
11794 (num_fields + DW_FIELD_ALLOC_CHUNK)
11795 * sizeof (struct field));
11798 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
11799 FIELD_TYPE (fields[num_fields]) = NULL;
11800 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
11801 FIELD_BITSIZE (fields[num_fields]) = 0;
11807 child_die = sibling_die (child_die);
11812 TYPE_NFIELDS (this_type) = num_fields;
11813 TYPE_FIELDS (this_type) = (struct field *)
11814 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
11815 memcpy (TYPE_FIELDS (this_type), fields,
11816 sizeof (struct field) * num_fields);
11820 TYPE_UNSIGNED (this_type) = 1;
11822 TYPE_FLAG_ENUM (this_type) = 1;
11825 /* If we are reading an enum from a .debug_types unit, and the enum
11826 is a declaration, and the enum is not the signatured type in the
11827 unit, then we do not want to add a symbol for it. Adding a
11828 symbol would in some cases obscure the true definition of the
11829 enum, giving users an incomplete type when the definition is
11830 actually available. Note that we do not want to do this for all
11831 enums which are just declarations, because C++0x allows forward
11832 enum declarations. */
11833 if (cu->per_cu->is_debug_types
11834 && die_is_declaration (die, cu))
11836 struct signatured_type *sig_type;
11838 sig_type = (struct signatured_type *) cu->per_cu;
11839 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
11840 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
11844 new_symbol (die, this_type, cu);
11847 /* Extract all information from a DW_TAG_array_type DIE and put it in
11848 the DIE's type field. For now, this only handles one dimensional
11851 static struct type *
11852 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
11854 struct objfile *objfile = cu->objfile;
11855 struct die_info *child_die;
11857 struct type *element_type, *range_type, *index_type;
11858 struct type **range_types = NULL;
11859 struct attribute *attr;
11861 struct cleanup *back_to;
11864 element_type = die_type (die, cu);
11866 /* The die_type call above may have already set the type for this DIE. */
11867 type = get_die_type (die, cu);
11871 /* Irix 6.2 native cc creates array types without children for
11872 arrays with unspecified length. */
11873 if (die->child == NULL)
11875 index_type = objfile_type (objfile)->builtin_int;
11876 range_type = create_range_type (NULL, index_type, 0, -1);
11877 type = create_array_type (NULL, element_type, range_type);
11878 return set_die_type (die, type, cu);
11881 back_to = make_cleanup (null_cleanup, NULL);
11882 child_die = die->child;
11883 while (child_die && child_die->tag)
11885 if (child_die->tag == DW_TAG_subrange_type)
11887 struct type *child_type = read_type_die (child_die, cu);
11889 if (child_type != NULL)
11891 /* The range type was succesfully read. Save it for the
11892 array type creation. */
11893 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
11895 range_types = (struct type **)
11896 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
11897 * sizeof (struct type *));
11899 make_cleanup (free_current_contents, &range_types);
11901 range_types[ndim++] = child_type;
11904 child_die = sibling_die (child_die);
11907 /* Dwarf2 dimensions are output from left to right, create the
11908 necessary array types in backwards order. */
11910 type = element_type;
11912 if (read_array_order (die, cu) == DW_ORD_col_major)
11917 type = create_array_type (NULL, type, range_types[i++]);
11922 type = create_array_type (NULL, type, range_types[ndim]);
11925 /* Understand Dwarf2 support for vector types (like they occur on
11926 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
11927 array type. This is not part of the Dwarf2/3 standard yet, but a
11928 custom vendor extension. The main difference between a regular
11929 array and the vector variant is that vectors are passed by value
11931 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
11933 make_vector_type (type);
11935 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
11936 implementation may choose to implement triple vectors using this
11938 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11941 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
11942 TYPE_LENGTH (type) = DW_UNSND (attr);
11944 complaint (&symfile_complaints,
11945 _("DW_AT_byte_size for array type smaller "
11946 "than the total size of elements"));
11949 name = dwarf2_name (die, cu);
11951 TYPE_NAME (type) = name;
11953 /* Install the type in the die. */
11954 set_die_type (die, type, cu);
11956 /* set_die_type should be already done. */
11957 set_descriptive_type (type, die, cu);
11959 do_cleanups (back_to);
11964 static enum dwarf_array_dim_ordering
11965 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
11967 struct attribute *attr;
11969 attr = dwarf2_attr (die, DW_AT_ordering, cu);
11971 if (attr) return DW_SND (attr);
11973 /* GNU F77 is a special case, as at 08/2004 array type info is the
11974 opposite order to the dwarf2 specification, but data is still
11975 laid out as per normal fortran.
11977 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
11978 version checking. */
11980 if (cu->language == language_fortran
11981 && cu->producer && strstr (cu->producer, "GNU F77"))
11983 return DW_ORD_row_major;
11986 switch (cu->language_defn->la_array_ordering)
11988 case array_column_major:
11989 return DW_ORD_col_major;
11990 case array_row_major:
11992 return DW_ORD_row_major;
11996 /* Extract all information from a DW_TAG_set_type DIE and put it in
11997 the DIE's type field. */
11999 static struct type *
12000 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12002 struct type *domain_type, *set_type;
12003 struct attribute *attr;
12005 domain_type = die_type (die, cu);
12007 /* The die_type call above may have already set the type for this DIE. */
12008 set_type = get_die_type (die, cu);
12012 set_type = create_set_type (NULL, domain_type);
12014 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12016 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12018 return set_die_type (die, set_type, cu);
12021 /* A helper for read_common_block that creates a locexpr baton.
12022 SYM is the symbol which we are marking as computed.
12023 COMMON_DIE is the DIE for the common block.
12024 COMMON_LOC is the location expression attribute for the common
12026 MEMBER_LOC is the location expression attribute for the particular
12027 member of the common block that we are processing.
12028 CU is the CU from which the above come. */
12031 mark_common_block_symbol_computed (struct symbol *sym,
12032 struct die_info *common_die,
12033 struct attribute *common_loc,
12034 struct attribute *member_loc,
12035 struct dwarf2_cu *cu)
12037 struct objfile *objfile = dwarf2_per_objfile->objfile;
12038 struct dwarf2_locexpr_baton *baton;
12040 unsigned int cu_off;
12041 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12042 LONGEST offset = 0;
12044 gdb_assert (common_loc && member_loc);
12045 gdb_assert (attr_form_is_block (common_loc));
12046 gdb_assert (attr_form_is_block (member_loc)
12047 || attr_form_is_constant (member_loc));
12049 baton = obstack_alloc (&objfile->objfile_obstack,
12050 sizeof (struct dwarf2_locexpr_baton));
12051 baton->per_cu = cu->per_cu;
12052 gdb_assert (baton->per_cu);
12054 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12056 if (attr_form_is_constant (member_loc))
12058 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12059 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12062 baton->size += DW_BLOCK (member_loc)->size;
12064 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12067 *ptr++ = DW_OP_call4;
12068 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12069 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12072 if (attr_form_is_constant (member_loc))
12074 *ptr++ = DW_OP_addr;
12075 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12076 ptr += cu->header.addr_size;
12080 /* We have to copy the data here, because DW_OP_call4 will only
12081 use a DW_AT_location attribute. */
12082 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12083 ptr += DW_BLOCK (member_loc)->size;
12086 *ptr++ = DW_OP_plus;
12087 gdb_assert (ptr - baton->data == baton->size);
12089 SYMBOL_LOCATION_BATON (sym) = baton;
12090 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12093 /* Create appropriate locally-scoped variables for all the
12094 DW_TAG_common_block entries. Also create a struct common_block
12095 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12096 is used to sepate the common blocks name namespace from regular
12100 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12102 struct attribute *attr;
12104 attr = dwarf2_attr (die, DW_AT_location, cu);
12107 /* Support the .debug_loc offsets. */
12108 if (attr_form_is_block (attr))
12112 else if (attr_form_is_section_offset (attr))
12114 dwarf2_complex_location_expr_complaint ();
12119 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12120 "common block member");
12125 if (die->child != NULL)
12127 struct objfile *objfile = cu->objfile;
12128 struct die_info *child_die;
12129 size_t n_entries = 0, size;
12130 struct common_block *common_block;
12131 struct symbol *sym;
12133 for (child_die = die->child;
12134 child_die && child_die->tag;
12135 child_die = sibling_die (child_die))
12138 size = (sizeof (struct common_block)
12139 + (n_entries - 1) * sizeof (struct symbol *));
12140 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12141 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12142 common_block->n_entries = 0;
12144 for (child_die = die->child;
12145 child_die && child_die->tag;
12146 child_die = sibling_die (child_die))
12148 /* Create the symbol in the DW_TAG_common_block block in the current
12150 sym = new_symbol (child_die, NULL, cu);
12153 struct attribute *member_loc;
12155 common_block->contents[common_block->n_entries++] = sym;
12157 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12161 /* GDB has handled this for a long time, but it is
12162 not specified by DWARF. It seems to have been
12163 emitted by gfortran at least as recently as:
12164 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12165 complaint (&symfile_complaints,
12166 _("Variable in common block has "
12167 "DW_AT_data_member_location "
12168 "- DIE at 0x%x [in module %s]"),
12169 child_die->offset.sect_off, cu->objfile->name);
12171 if (attr_form_is_section_offset (member_loc))
12172 dwarf2_complex_location_expr_complaint ();
12173 else if (attr_form_is_constant (member_loc)
12174 || attr_form_is_block (member_loc))
12177 mark_common_block_symbol_computed (sym, die, attr,
12181 dwarf2_complex_location_expr_complaint ();
12186 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12187 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12191 /* Create a type for a C++ namespace. */
12193 static struct type *
12194 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12196 struct objfile *objfile = cu->objfile;
12197 const char *previous_prefix, *name;
12201 /* For extensions, reuse the type of the original namespace. */
12202 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12204 struct die_info *ext_die;
12205 struct dwarf2_cu *ext_cu = cu;
12207 ext_die = dwarf2_extension (die, &ext_cu);
12208 type = read_type_die (ext_die, ext_cu);
12210 /* EXT_CU may not be the same as CU.
12211 Ensure TYPE is recorded with CU in die_type_hash. */
12212 return set_die_type (die, type, cu);
12215 name = namespace_name (die, &is_anonymous, cu);
12217 /* Now build the name of the current namespace. */
12219 previous_prefix = determine_prefix (die, cu);
12220 if (previous_prefix[0] != '\0')
12221 name = typename_concat (&objfile->objfile_obstack,
12222 previous_prefix, name, 0, cu);
12224 /* Create the type. */
12225 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12227 TYPE_NAME (type) = name;
12228 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12230 return set_die_type (die, type, cu);
12233 /* Read a C++ namespace. */
12236 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12238 struct objfile *objfile = cu->objfile;
12241 /* Add a symbol associated to this if we haven't seen the namespace
12242 before. Also, add a using directive if it's an anonymous
12245 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12249 type = read_type_die (die, cu);
12250 new_symbol (die, type, cu);
12252 namespace_name (die, &is_anonymous, cu);
12255 const char *previous_prefix = determine_prefix (die, cu);
12257 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12258 NULL, NULL, 0, &objfile->objfile_obstack);
12262 if (die->child != NULL)
12264 struct die_info *child_die = die->child;
12266 while (child_die && child_die->tag)
12268 process_die (child_die, cu);
12269 child_die = sibling_die (child_die);
12274 /* Read a Fortran module as type. This DIE can be only a declaration used for
12275 imported module. Still we need that type as local Fortran "use ... only"
12276 declaration imports depend on the created type in determine_prefix. */
12278 static struct type *
12279 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12281 struct objfile *objfile = cu->objfile;
12282 const char *module_name;
12285 module_name = dwarf2_name (die, cu);
12287 complaint (&symfile_complaints,
12288 _("DW_TAG_module has no name, offset 0x%x"),
12289 die->offset.sect_off);
12290 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12292 /* determine_prefix uses TYPE_TAG_NAME. */
12293 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12295 return set_die_type (die, type, cu);
12298 /* Read a Fortran module. */
12301 read_module (struct die_info *die, struct dwarf2_cu *cu)
12303 struct die_info *child_die = die->child;
12305 while (child_die && child_die->tag)
12307 process_die (child_die, cu);
12308 child_die = sibling_die (child_die);
12312 /* Return the name of the namespace represented by DIE. Set
12313 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12316 static const char *
12317 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12319 struct die_info *current_die;
12320 const char *name = NULL;
12322 /* Loop through the extensions until we find a name. */
12324 for (current_die = die;
12325 current_die != NULL;
12326 current_die = dwarf2_extension (die, &cu))
12328 name = dwarf2_name (current_die, cu);
12333 /* Is it an anonymous namespace? */
12335 *is_anonymous = (name == NULL);
12337 name = CP_ANONYMOUS_NAMESPACE_STR;
12342 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12343 the user defined type vector. */
12345 static struct type *
12346 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12348 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12349 struct comp_unit_head *cu_header = &cu->header;
12351 struct attribute *attr_byte_size;
12352 struct attribute *attr_address_class;
12353 int byte_size, addr_class;
12354 struct type *target_type;
12356 target_type = die_type (die, cu);
12358 /* The die_type call above may have already set the type for this DIE. */
12359 type = get_die_type (die, cu);
12363 type = lookup_pointer_type (target_type);
12365 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12366 if (attr_byte_size)
12367 byte_size = DW_UNSND (attr_byte_size);
12369 byte_size = cu_header->addr_size;
12371 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12372 if (attr_address_class)
12373 addr_class = DW_UNSND (attr_address_class);
12375 addr_class = DW_ADDR_none;
12377 /* If the pointer size or address class is different than the
12378 default, create a type variant marked as such and set the
12379 length accordingly. */
12380 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12382 if (gdbarch_address_class_type_flags_p (gdbarch))
12386 type_flags = gdbarch_address_class_type_flags
12387 (gdbarch, byte_size, addr_class);
12388 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12390 type = make_type_with_address_space (type, type_flags);
12392 else if (TYPE_LENGTH (type) != byte_size)
12394 complaint (&symfile_complaints,
12395 _("invalid pointer size %d"), byte_size);
12399 /* Should we also complain about unhandled address classes? */
12403 TYPE_LENGTH (type) = byte_size;
12404 return set_die_type (die, type, cu);
12407 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12408 the user defined type vector. */
12410 static struct type *
12411 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12414 struct type *to_type;
12415 struct type *domain;
12417 to_type = die_type (die, cu);
12418 domain = die_containing_type (die, cu);
12420 /* The calls above may have already set the type for this DIE. */
12421 type = get_die_type (die, cu);
12425 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12426 type = lookup_methodptr_type (to_type);
12427 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12429 struct type *new_type = alloc_type (cu->objfile);
12431 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12432 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12433 TYPE_VARARGS (to_type));
12434 type = lookup_methodptr_type (new_type);
12437 type = lookup_memberptr_type (to_type, domain);
12439 return set_die_type (die, type, cu);
12442 /* Extract all information from a DW_TAG_reference_type DIE and add to
12443 the user defined type vector. */
12445 static struct type *
12446 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12448 struct comp_unit_head *cu_header = &cu->header;
12449 struct type *type, *target_type;
12450 struct attribute *attr;
12452 target_type = die_type (die, cu);
12454 /* The die_type call above may have already set the type for this DIE. */
12455 type = get_die_type (die, cu);
12459 type = lookup_reference_type (target_type);
12460 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12463 TYPE_LENGTH (type) = DW_UNSND (attr);
12467 TYPE_LENGTH (type) = cu_header->addr_size;
12469 return set_die_type (die, type, cu);
12472 static struct type *
12473 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12475 struct type *base_type, *cv_type;
12477 base_type = die_type (die, cu);
12479 /* The die_type call above may have already set the type for this DIE. */
12480 cv_type = get_die_type (die, cu);
12484 /* In case the const qualifier is applied to an array type, the element type
12485 is so qualified, not the array type (section 6.7.3 of C99). */
12486 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12488 struct type *el_type, *inner_array;
12490 base_type = copy_type (base_type);
12491 inner_array = base_type;
12493 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12495 TYPE_TARGET_TYPE (inner_array) =
12496 copy_type (TYPE_TARGET_TYPE (inner_array));
12497 inner_array = TYPE_TARGET_TYPE (inner_array);
12500 el_type = TYPE_TARGET_TYPE (inner_array);
12501 TYPE_TARGET_TYPE (inner_array) =
12502 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12504 return set_die_type (die, base_type, cu);
12507 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12508 return set_die_type (die, cv_type, cu);
12511 static struct type *
12512 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12514 struct type *base_type, *cv_type;
12516 base_type = die_type (die, cu);
12518 /* The die_type call above may have already set the type for this DIE. */
12519 cv_type = get_die_type (die, cu);
12523 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12524 return set_die_type (die, cv_type, cu);
12527 /* Handle DW_TAG_restrict_type. */
12529 static struct type *
12530 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12532 struct type *base_type, *cv_type;
12534 base_type = die_type (die, cu);
12536 /* The die_type call above may have already set the type for this DIE. */
12537 cv_type = get_die_type (die, cu);
12541 cv_type = make_restrict_type (base_type);
12542 return set_die_type (die, cv_type, cu);
12545 /* Extract all information from a DW_TAG_string_type DIE and add to
12546 the user defined type vector. It isn't really a user defined type,
12547 but it behaves like one, with other DIE's using an AT_user_def_type
12548 attribute to reference it. */
12550 static struct type *
12551 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12553 struct objfile *objfile = cu->objfile;
12554 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12555 struct type *type, *range_type, *index_type, *char_type;
12556 struct attribute *attr;
12557 unsigned int length;
12559 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12562 length = DW_UNSND (attr);
12566 /* Check for the DW_AT_byte_size attribute. */
12567 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12570 length = DW_UNSND (attr);
12578 index_type = objfile_type (objfile)->builtin_int;
12579 range_type = create_range_type (NULL, index_type, 1, length);
12580 char_type = language_string_char_type (cu->language_defn, gdbarch);
12581 type = create_string_type (NULL, char_type, range_type);
12583 return set_die_type (die, type, cu);
12586 /* Handle DIES due to C code like:
12590 int (*funcp)(int a, long l);
12594 ('funcp' generates a DW_TAG_subroutine_type DIE). */
12596 static struct type *
12597 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
12599 struct objfile *objfile = cu->objfile;
12600 struct type *type; /* Type that this function returns. */
12601 struct type *ftype; /* Function that returns above type. */
12602 struct attribute *attr;
12604 type = die_type (die, cu);
12606 /* The die_type call above may have already set the type for this DIE. */
12607 ftype = get_die_type (die, cu);
12611 ftype = lookup_function_type (type);
12613 /* All functions in C++, Pascal and Java have prototypes. */
12614 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
12615 if ((attr && (DW_UNSND (attr) != 0))
12616 || cu->language == language_cplus
12617 || cu->language == language_java
12618 || cu->language == language_pascal)
12619 TYPE_PROTOTYPED (ftype) = 1;
12620 else if (producer_is_realview (cu->producer))
12621 /* RealView does not emit DW_AT_prototyped. We can not
12622 distinguish prototyped and unprototyped functions; default to
12623 prototyped, since that is more common in modern code (and
12624 RealView warns about unprototyped functions). */
12625 TYPE_PROTOTYPED (ftype) = 1;
12627 /* Store the calling convention in the type if it's available in
12628 the subroutine die. Otherwise set the calling convention to
12629 the default value DW_CC_normal. */
12630 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
12632 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
12633 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
12634 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
12636 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
12638 /* We need to add the subroutine type to the die immediately so
12639 we don't infinitely recurse when dealing with parameters
12640 declared as the same subroutine type. */
12641 set_die_type (die, ftype, cu);
12643 if (die->child != NULL)
12645 struct type *void_type = objfile_type (objfile)->builtin_void;
12646 struct die_info *child_die;
12647 int nparams, iparams;
12649 /* Count the number of parameters.
12650 FIXME: GDB currently ignores vararg functions, but knows about
12651 vararg member functions. */
12653 child_die = die->child;
12654 while (child_die && child_die->tag)
12656 if (child_die->tag == DW_TAG_formal_parameter)
12658 else if (child_die->tag == DW_TAG_unspecified_parameters)
12659 TYPE_VARARGS (ftype) = 1;
12660 child_die = sibling_die (child_die);
12663 /* Allocate storage for parameters and fill them in. */
12664 TYPE_NFIELDS (ftype) = nparams;
12665 TYPE_FIELDS (ftype) = (struct field *)
12666 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
12668 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
12669 even if we error out during the parameters reading below. */
12670 for (iparams = 0; iparams < nparams; iparams++)
12671 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
12674 child_die = die->child;
12675 while (child_die && child_die->tag)
12677 if (child_die->tag == DW_TAG_formal_parameter)
12679 struct type *arg_type;
12681 /* DWARF version 2 has no clean way to discern C++
12682 static and non-static member functions. G++ helps
12683 GDB by marking the first parameter for non-static
12684 member functions (which is the this pointer) as
12685 artificial. We pass this information to
12686 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
12688 DWARF version 3 added DW_AT_object_pointer, which GCC
12689 4.5 does not yet generate. */
12690 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
12692 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
12695 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
12697 /* GCC/43521: In java, the formal parameter
12698 "this" is sometimes not marked with DW_AT_artificial. */
12699 if (cu->language == language_java)
12701 const char *name = dwarf2_name (child_die, cu);
12703 if (name && !strcmp (name, "this"))
12704 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
12707 arg_type = die_type (child_die, cu);
12709 /* RealView does not mark THIS as const, which the testsuite
12710 expects. GCC marks THIS as const in method definitions,
12711 but not in the class specifications (GCC PR 43053). */
12712 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
12713 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
12716 struct dwarf2_cu *arg_cu = cu;
12717 const char *name = dwarf2_name (child_die, cu);
12719 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
12722 /* If the compiler emits this, use it. */
12723 if (follow_die_ref (die, attr, &arg_cu) == child_die)
12726 else if (name && strcmp (name, "this") == 0)
12727 /* Function definitions will have the argument names. */
12729 else if (name == NULL && iparams == 0)
12730 /* Declarations may not have the names, so like
12731 elsewhere in GDB, assume an artificial first
12732 argument is "this". */
12736 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
12740 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
12743 child_die = sibling_die (child_die);
12750 static struct type *
12751 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
12753 struct objfile *objfile = cu->objfile;
12754 const char *name = NULL;
12755 struct type *this_type, *target_type;
12757 name = dwarf2_full_name (NULL, die, cu);
12758 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
12759 TYPE_FLAG_TARGET_STUB, NULL, objfile);
12760 TYPE_NAME (this_type) = name;
12761 set_die_type (die, this_type, cu);
12762 target_type = die_type (die, cu);
12763 if (target_type != this_type)
12764 TYPE_TARGET_TYPE (this_type) = target_type;
12767 /* Self-referential typedefs are, it seems, not allowed by the DWARF
12768 spec and cause infinite loops in GDB. */
12769 complaint (&symfile_complaints,
12770 _("Self-referential DW_TAG_typedef "
12771 "- DIE at 0x%x [in module %s]"),
12772 die->offset.sect_off, objfile->name);
12773 TYPE_TARGET_TYPE (this_type) = NULL;
12778 /* Find a representation of a given base type and install
12779 it in the TYPE field of the die. */
12781 static struct type *
12782 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
12784 struct objfile *objfile = cu->objfile;
12786 struct attribute *attr;
12787 int encoding = 0, size = 0;
12789 enum type_code code = TYPE_CODE_INT;
12790 int type_flags = 0;
12791 struct type *target_type = NULL;
12793 attr = dwarf2_attr (die, DW_AT_encoding, cu);
12796 encoding = DW_UNSND (attr);
12798 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12801 size = DW_UNSND (attr);
12803 name = dwarf2_name (die, cu);
12806 complaint (&symfile_complaints,
12807 _("DW_AT_name missing from DW_TAG_base_type"));
12812 case DW_ATE_address:
12813 /* Turn DW_ATE_address into a void * pointer. */
12814 code = TYPE_CODE_PTR;
12815 type_flags |= TYPE_FLAG_UNSIGNED;
12816 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
12818 case DW_ATE_boolean:
12819 code = TYPE_CODE_BOOL;
12820 type_flags |= TYPE_FLAG_UNSIGNED;
12822 case DW_ATE_complex_float:
12823 code = TYPE_CODE_COMPLEX;
12824 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
12826 case DW_ATE_decimal_float:
12827 code = TYPE_CODE_DECFLOAT;
12830 code = TYPE_CODE_FLT;
12832 case DW_ATE_signed:
12834 case DW_ATE_unsigned:
12835 type_flags |= TYPE_FLAG_UNSIGNED;
12836 if (cu->language == language_fortran
12838 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
12839 code = TYPE_CODE_CHAR;
12841 case DW_ATE_signed_char:
12842 if (cu->language == language_ada || cu->language == language_m2
12843 || cu->language == language_pascal
12844 || cu->language == language_fortran)
12845 code = TYPE_CODE_CHAR;
12847 case DW_ATE_unsigned_char:
12848 if (cu->language == language_ada || cu->language == language_m2
12849 || cu->language == language_pascal
12850 || cu->language == language_fortran)
12851 code = TYPE_CODE_CHAR;
12852 type_flags |= TYPE_FLAG_UNSIGNED;
12855 /* We just treat this as an integer and then recognize the
12856 type by name elsewhere. */
12860 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
12861 dwarf_type_encoding_name (encoding));
12865 type = init_type (code, size, type_flags, NULL, objfile);
12866 TYPE_NAME (type) = name;
12867 TYPE_TARGET_TYPE (type) = target_type;
12869 if (name && strcmp (name, "char") == 0)
12870 TYPE_NOSIGN (type) = 1;
12872 return set_die_type (die, type, cu);
12875 /* Read the given DW_AT_subrange DIE. */
12877 static struct type *
12878 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
12880 struct type *base_type, *orig_base_type;
12881 struct type *range_type;
12882 struct attribute *attr;
12884 int low_default_is_valid;
12886 LONGEST negative_mask;
12888 orig_base_type = die_type (die, cu);
12889 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
12890 whereas the real type might be. So, we use ORIG_BASE_TYPE when
12891 creating the range type, but we use the result of check_typedef
12892 when examining properties of the type. */
12893 base_type = check_typedef (orig_base_type);
12895 /* The die_type call above may have already set the type for this DIE. */
12896 range_type = get_die_type (die, cu);
12900 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
12901 omitting DW_AT_lower_bound. */
12902 switch (cu->language)
12905 case language_cplus:
12907 low_default_is_valid = 1;
12909 case language_fortran:
12911 low_default_is_valid = 1;
12914 case language_java:
12915 case language_objc:
12917 low_default_is_valid = (cu->header.version >= 4);
12921 case language_pascal:
12923 low_default_is_valid = (cu->header.version >= 4);
12927 low_default_is_valid = 0;
12931 /* FIXME: For variable sized arrays either of these could be
12932 a variable rather than a constant value. We'll allow it,
12933 but we don't know how to handle it. */
12934 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
12936 low = dwarf2_get_attr_constant_value (attr, low);
12937 else if (!low_default_is_valid)
12938 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
12939 "- DIE at 0x%x [in module %s]"),
12940 die->offset.sect_off, cu->objfile->name);
12942 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
12945 if (attr_form_is_block (attr) || is_ref_attr (attr))
12947 /* GCC encodes arrays with unspecified or dynamic length
12948 with a DW_FORM_block1 attribute or a reference attribute.
12949 FIXME: GDB does not yet know how to handle dynamic
12950 arrays properly, treat them as arrays with unspecified
12953 FIXME: jimb/2003-09-22: GDB does not really know
12954 how to handle arrays of unspecified length
12955 either; we just represent them as zero-length
12956 arrays. Choose an appropriate upper bound given
12957 the lower bound we've computed above. */
12961 high = dwarf2_get_attr_constant_value (attr, 1);
12965 attr = dwarf2_attr (die, DW_AT_count, cu);
12968 int count = dwarf2_get_attr_constant_value (attr, 1);
12969 high = low + count - 1;
12973 /* Unspecified array length. */
12978 /* Dwarf-2 specifications explicitly allows to create subrange types
12979 without specifying a base type.
12980 In that case, the base type must be set to the type of
12981 the lower bound, upper bound or count, in that order, if any of these
12982 three attributes references an object that has a type.
12983 If no base type is found, the Dwarf-2 specifications say that
12984 a signed integer type of size equal to the size of an address should
12986 For the following C code: `extern char gdb_int [];'
12987 GCC produces an empty range DIE.
12988 FIXME: muller/2010-05-28: Possible references to object for low bound,
12989 high bound or count are not yet handled by this code. */
12990 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
12992 struct objfile *objfile = cu->objfile;
12993 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12994 int addr_size = gdbarch_addr_bit (gdbarch) /8;
12995 struct type *int_type = objfile_type (objfile)->builtin_int;
12997 /* Test "int", "long int", and "long long int" objfile types,
12998 and select the first one having a size above or equal to the
12999 architecture address size. */
13000 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13001 base_type = int_type;
13004 int_type = objfile_type (objfile)->builtin_long;
13005 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13006 base_type = int_type;
13009 int_type = objfile_type (objfile)->builtin_long_long;
13010 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13011 base_type = int_type;
13017 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13018 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13019 low |= negative_mask;
13020 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13021 high |= negative_mask;
13023 range_type = create_range_type (NULL, orig_base_type, low, high);
13025 /* Mark arrays with dynamic length at least as an array of unspecified
13026 length. GDB could check the boundary but before it gets implemented at
13027 least allow accessing the array elements. */
13028 if (attr && attr_form_is_block (attr))
13029 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13031 /* Ada expects an empty array on no boundary attributes. */
13032 if (attr == NULL && cu->language != language_ada)
13033 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13035 name = dwarf2_name (die, cu);
13037 TYPE_NAME (range_type) = name;
13039 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13041 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13043 set_die_type (die, range_type, cu);
13045 /* set_die_type should be already done. */
13046 set_descriptive_type (range_type, die, cu);
13051 static struct type *
13052 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13056 /* For now, we only support the C meaning of an unspecified type: void. */
13058 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13059 TYPE_NAME (type) = dwarf2_name (die, cu);
13061 return set_die_type (die, type, cu);
13064 /* Read a single die and all its descendents. Set the die's sibling
13065 field to NULL; set other fields in the die correctly, and set all
13066 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13067 location of the info_ptr after reading all of those dies. PARENT
13068 is the parent of the die in question. */
13070 static struct die_info *
13071 read_die_and_children (const struct die_reader_specs *reader,
13072 const gdb_byte *info_ptr,
13073 const gdb_byte **new_info_ptr,
13074 struct die_info *parent)
13076 struct die_info *die;
13077 const gdb_byte *cur_ptr;
13080 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13083 *new_info_ptr = cur_ptr;
13086 store_in_ref_table (die, reader->cu);
13089 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13093 *new_info_ptr = cur_ptr;
13096 die->sibling = NULL;
13097 die->parent = parent;
13101 /* Read a die, all of its descendents, and all of its siblings; set
13102 all of the fields of all of the dies correctly. Arguments are as
13103 in read_die_and_children. */
13105 static struct die_info *
13106 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13107 const gdb_byte *info_ptr,
13108 const gdb_byte **new_info_ptr,
13109 struct die_info *parent)
13111 struct die_info *first_die, *last_sibling;
13112 const gdb_byte *cur_ptr;
13114 cur_ptr = info_ptr;
13115 first_die = last_sibling = NULL;
13119 struct die_info *die
13120 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13124 *new_info_ptr = cur_ptr;
13131 last_sibling->sibling = die;
13133 last_sibling = die;
13137 /* Read a die, all of its descendents, and all of its siblings; set
13138 all of the fields of all of the dies correctly. Arguments are as
13139 in read_die_and_children.
13140 This the main entry point for reading a DIE and all its children. */
13142 static struct die_info *
13143 read_die_and_siblings (const struct die_reader_specs *reader,
13144 const gdb_byte *info_ptr,
13145 const gdb_byte **new_info_ptr,
13146 struct die_info *parent)
13148 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13149 new_info_ptr, parent);
13151 if (dwarf2_die_debug)
13153 fprintf_unfiltered (gdb_stdlog,
13154 "Read die from %s@0x%x of %s:\n",
13155 bfd_section_name (reader->abfd,
13156 reader->die_section->asection),
13157 (unsigned) (info_ptr - reader->die_section->buffer),
13158 bfd_get_filename (reader->abfd));
13159 dump_die (die, dwarf2_die_debug);
13165 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13167 The caller is responsible for filling in the extra attributes
13168 and updating (*DIEP)->num_attrs.
13169 Set DIEP to point to a newly allocated die with its information,
13170 except for its child, sibling, and parent fields.
13171 Set HAS_CHILDREN to tell whether the die has children or not. */
13173 static const gdb_byte *
13174 read_full_die_1 (const struct die_reader_specs *reader,
13175 struct die_info **diep, const gdb_byte *info_ptr,
13176 int *has_children, int num_extra_attrs)
13178 unsigned int abbrev_number, bytes_read, i;
13179 sect_offset offset;
13180 struct abbrev_info *abbrev;
13181 struct die_info *die;
13182 struct dwarf2_cu *cu = reader->cu;
13183 bfd *abfd = reader->abfd;
13185 offset.sect_off = info_ptr - reader->buffer;
13186 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13187 info_ptr += bytes_read;
13188 if (!abbrev_number)
13195 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13197 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13199 bfd_get_filename (abfd));
13201 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13202 die->offset = offset;
13203 die->tag = abbrev->tag;
13204 die->abbrev = abbrev_number;
13206 /* Make the result usable.
13207 The caller needs to update num_attrs after adding the extra
13209 die->num_attrs = abbrev->num_attrs;
13211 for (i = 0; i < abbrev->num_attrs; ++i)
13212 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13216 *has_children = abbrev->has_children;
13220 /* Read a die and all its attributes.
13221 Set DIEP to point to a newly allocated die with its information,
13222 except for its child, sibling, and parent fields.
13223 Set HAS_CHILDREN to tell whether the die has children or not. */
13225 static const gdb_byte *
13226 read_full_die (const struct die_reader_specs *reader,
13227 struct die_info **diep, const gdb_byte *info_ptr,
13230 const gdb_byte *result;
13232 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13234 if (dwarf2_die_debug)
13236 fprintf_unfiltered (gdb_stdlog,
13237 "Read die from %s@0x%x of %s:\n",
13238 bfd_section_name (reader->abfd,
13239 reader->die_section->asection),
13240 (unsigned) (info_ptr - reader->die_section->buffer),
13241 bfd_get_filename (reader->abfd));
13242 dump_die (*diep, dwarf2_die_debug);
13248 /* Abbreviation tables.
13250 In DWARF version 2, the description of the debugging information is
13251 stored in a separate .debug_abbrev section. Before we read any
13252 dies from a section we read in all abbreviations and install them
13253 in a hash table. */
13255 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13257 static struct abbrev_info *
13258 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13260 struct abbrev_info *abbrev;
13262 abbrev = (struct abbrev_info *)
13263 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13264 memset (abbrev, 0, sizeof (struct abbrev_info));
13268 /* Add an abbreviation to the table. */
13271 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13272 unsigned int abbrev_number,
13273 struct abbrev_info *abbrev)
13275 unsigned int hash_number;
13277 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13278 abbrev->next = abbrev_table->abbrevs[hash_number];
13279 abbrev_table->abbrevs[hash_number] = abbrev;
13282 /* Look up an abbrev in the table.
13283 Returns NULL if the abbrev is not found. */
13285 static struct abbrev_info *
13286 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13287 unsigned int abbrev_number)
13289 unsigned int hash_number;
13290 struct abbrev_info *abbrev;
13292 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13293 abbrev = abbrev_table->abbrevs[hash_number];
13297 if (abbrev->number == abbrev_number)
13299 abbrev = abbrev->next;
13304 /* Read in an abbrev table. */
13306 static struct abbrev_table *
13307 abbrev_table_read_table (struct dwarf2_section_info *section,
13308 sect_offset offset)
13310 struct objfile *objfile = dwarf2_per_objfile->objfile;
13311 bfd *abfd = section->asection->owner;
13312 struct abbrev_table *abbrev_table;
13313 const gdb_byte *abbrev_ptr;
13314 struct abbrev_info *cur_abbrev;
13315 unsigned int abbrev_number, bytes_read, abbrev_name;
13316 unsigned int abbrev_form;
13317 struct attr_abbrev *cur_attrs;
13318 unsigned int allocated_attrs;
13320 abbrev_table = XMALLOC (struct abbrev_table);
13321 abbrev_table->offset = offset;
13322 obstack_init (&abbrev_table->abbrev_obstack);
13323 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13325 * sizeof (struct abbrev_info *)));
13326 memset (abbrev_table->abbrevs, 0,
13327 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13329 dwarf2_read_section (objfile, section);
13330 abbrev_ptr = section->buffer + offset.sect_off;
13331 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13332 abbrev_ptr += bytes_read;
13334 allocated_attrs = ATTR_ALLOC_CHUNK;
13335 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13337 /* Loop until we reach an abbrev number of 0. */
13338 while (abbrev_number)
13340 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13342 /* read in abbrev header */
13343 cur_abbrev->number = abbrev_number;
13344 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13345 abbrev_ptr += bytes_read;
13346 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13349 /* now read in declarations */
13350 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13351 abbrev_ptr += bytes_read;
13352 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13353 abbrev_ptr += bytes_read;
13354 while (abbrev_name)
13356 if (cur_abbrev->num_attrs == allocated_attrs)
13358 allocated_attrs += ATTR_ALLOC_CHUNK;
13360 = xrealloc (cur_attrs, (allocated_attrs
13361 * sizeof (struct attr_abbrev)));
13364 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13365 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13366 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13367 abbrev_ptr += bytes_read;
13368 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13369 abbrev_ptr += bytes_read;
13372 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13373 (cur_abbrev->num_attrs
13374 * sizeof (struct attr_abbrev)));
13375 memcpy (cur_abbrev->attrs, cur_attrs,
13376 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13378 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13380 /* Get next abbreviation.
13381 Under Irix6 the abbreviations for a compilation unit are not
13382 always properly terminated with an abbrev number of 0.
13383 Exit loop if we encounter an abbreviation which we have
13384 already read (which means we are about to read the abbreviations
13385 for the next compile unit) or if the end of the abbreviation
13386 table is reached. */
13387 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13389 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13390 abbrev_ptr += bytes_read;
13391 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13396 return abbrev_table;
13399 /* Free the resources held by ABBREV_TABLE. */
13402 abbrev_table_free (struct abbrev_table *abbrev_table)
13404 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13405 xfree (abbrev_table);
13408 /* Same as abbrev_table_free but as a cleanup.
13409 We pass in a pointer to the pointer to the table so that we can
13410 set the pointer to NULL when we're done. It also simplifies
13411 build_type_unit_groups. */
13414 abbrev_table_free_cleanup (void *table_ptr)
13416 struct abbrev_table **abbrev_table_ptr = table_ptr;
13418 if (*abbrev_table_ptr != NULL)
13419 abbrev_table_free (*abbrev_table_ptr);
13420 *abbrev_table_ptr = NULL;
13423 /* Read the abbrev table for CU from ABBREV_SECTION. */
13426 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13427 struct dwarf2_section_info *abbrev_section)
13430 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13433 /* Release the memory used by the abbrev table for a compilation unit. */
13436 dwarf2_free_abbrev_table (void *ptr_to_cu)
13438 struct dwarf2_cu *cu = ptr_to_cu;
13440 abbrev_table_free (cu->abbrev_table);
13441 /* Set this to NULL so that we SEGV if we try to read it later,
13442 and also because free_comp_unit verifies this is NULL. */
13443 cu->abbrev_table = NULL;
13446 /* Returns nonzero if TAG represents a type that we might generate a partial
13450 is_type_tag_for_partial (int tag)
13455 /* Some types that would be reasonable to generate partial symbols for,
13456 that we don't at present. */
13457 case DW_TAG_array_type:
13458 case DW_TAG_file_type:
13459 case DW_TAG_ptr_to_member_type:
13460 case DW_TAG_set_type:
13461 case DW_TAG_string_type:
13462 case DW_TAG_subroutine_type:
13464 case DW_TAG_base_type:
13465 case DW_TAG_class_type:
13466 case DW_TAG_interface_type:
13467 case DW_TAG_enumeration_type:
13468 case DW_TAG_structure_type:
13469 case DW_TAG_subrange_type:
13470 case DW_TAG_typedef:
13471 case DW_TAG_union_type:
13478 /* Load all DIEs that are interesting for partial symbols into memory. */
13480 static struct partial_die_info *
13481 load_partial_dies (const struct die_reader_specs *reader,
13482 const gdb_byte *info_ptr, int building_psymtab)
13484 struct dwarf2_cu *cu = reader->cu;
13485 struct objfile *objfile = cu->objfile;
13486 struct partial_die_info *part_die;
13487 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13488 struct abbrev_info *abbrev;
13489 unsigned int bytes_read;
13490 unsigned int load_all = 0;
13491 int nesting_level = 1;
13496 gdb_assert (cu->per_cu != NULL);
13497 if (cu->per_cu->load_all_dies)
13501 = htab_create_alloc_ex (cu->header.length / 12,
13505 &cu->comp_unit_obstack,
13506 hashtab_obstack_allocate,
13507 dummy_obstack_deallocate);
13509 part_die = obstack_alloc (&cu->comp_unit_obstack,
13510 sizeof (struct partial_die_info));
13514 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13516 /* A NULL abbrev means the end of a series of children. */
13517 if (abbrev == NULL)
13519 if (--nesting_level == 0)
13521 /* PART_DIE was probably the last thing allocated on the
13522 comp_unit_obstack, so we could call obstack_free
13523 here. We don't do that because the waste is small,
13524 and will be cleaned up when we're done with this
13525 compilation unit. This way, we're also more robust
13526 against other users of the comp_unit_obstack. */
13529 info_ptr += bytes_read;
13530 last_die = parent_die;
13531 parent_die = parent_die->die_parent;
13535 /* Check for template arguments. We never save these; if
13536 they're seen, we just mark the parent, and go on our way. */
13537 if (parent_die != NULL
13538 && cu->language == language_cplus
13539 && (abbrev->tag == DW_TAG_template_type_param
13540 || abbrev->tag == DW_TAG_template_value_param))
13542 parent_die->has_template_arguments = 1;
13546 /* We don't need a partial DIE for the template argument. */
13547 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13552 /* We only recurse into c++ subprograms looking for template arguments.
13553 Skip their other children. */
13555 && cu->language == language_cplus
13556 && parent_die != NULL
13557 && parent_die->tag == DW_TAG_subprogram)
13559 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13563 /* Check whether this DIE is interesting enough to save. Normally
13564 we would not be interested in members here, but there may be
13565 later variables referencing them via DW_AT_specification (for
13566 static members). */
13568 && !is_type_tag_for_partial (abbrev->tag)
13569 && abbrev->tag != DW_TAG_constant
13570 && abbrev->tag != DW_TAG_enumerator
13571 && abbrev->tag != DW_TAG_subprogram
13572 && abbrev->tag != DW_TAG_lexical_block
13573 && abbrev->tag != DW_TAG_variable
13574 && abbrev->tag != DW_TAG_namespace
13575 && abbrev->tag != DW_TAG_module
13576 && abbrev->tag != DW_TAG_member
13577 && abbrev->tag != DW_TAG_imported_unit)
13579 /* Otherwise we skip to the next sibling, if any. */
13580 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13584 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
13587 /* This two-pass algorithm for processing partial symbols has a
13588 high cost in cache pressure. Thus, handle some simple cases
13589 here which cover the majority of C partial symbols. DIEs
13590 which neither have specification tags in them, nor could have
13591 specification tags elsewhere pointing at them, can simply be
13592 processed and discarded.
13594 This segment is also optional; scan_partial_symbols and
13595 add_partial_symbol will handle these DIEs if we chain
13596 them in normally. When compilers which do not emit large
13597 quantities of duplicate debug information are more common,
13598 this code can probably be removed. */
13600 /* Any complete simple types at the top level (pretty much all
13601 of them, for a language without namespaces), can be processed
13603 if (parent_die == NULL
13604 && part_die->has_specification == 0
13605 && part_die->is_declaration == 0
13606 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
13607 || part_die->tag == DW_TAG_base_type
13608 || part_die->tag == DW_TAG_subrange_type))
13610 if (building_psymtab && part_die->name != NULL)
13611 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13612 VAR_DOMAIN, LOC_TYPEDEF,
13613 &objfile->static_psymbols,
13614 0, (CORE_ADDR) 0, cu->language, objfile);
13615 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13619 /* The exception for DW_TAG_typedef with has_children above is
13620 a workaround of GCC PR debug/47510. In the case of this complaint
13621 type_name_no_tag_or_error will error on such types later.
13623 GDB skipped children of DW_TAG_typedef by the shortcut above and then
13624 it could not find the child DIEs referenced later, this is checked
13625 above. In correct DWARF DW_TAG_typedef should have no children. */
13627 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
13628 complaint (&symfile_complaints,
13629 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
13630 "- DIE at 0x%x [in module %s]"),
13631 part_die->offset.sect_off, objfile->name);
13633 /* If we're at the second level, and we're an enumerator, and
13634 our parent has no specification (meaning possibly lives in a
13635 namespace elsewhere), then we can add the partial symbol now
13636 instead of queueing it. */
13637 if (part_die->tag == DW_TAG_enumerator
13638 && parent_die != NULL
13639 && parent_die->die_parent == NULL
13640 && parent_die->tag == DW_TAG_enumeration_type
13641 && parent_die->has_specification == 0)
13643 if (part_die->name == NULL)
13644 complaint (&symfile_complaints,
13645 _("malformed enumerator DIE ignored"));
13646 else if (building_psymtab)
13647 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13648 VAR_DOMAIN, LOC_CONST,
13649 (cu->language == language_cplus
13650 || cu->language == language_java)
13651 ? &objfile->global_psymbols
13652 : &objfile->static_psymbols,
13653 0, (CORE_ADDR) 0, cu->language, objfile);
13655 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13659 /* We'll save this DIE so link it in. */
13660 part_die->die_parent = parent_die;
13661 part_die->die_sibling = NULL;
13662 part_die->die_child = NULL;
13664 if (last_die && last_die == parent_die)
13665 last_die->die_child = part_die;
13667 last_die->die_sibling = part_die;
13669 last_die = part_die;
13671 if (first_die == NULL)
13672 first_die = part_die;
13674 /* Maybe add the DIE to the hash table. Not all DIEs that we
13675 find interesting need to be in the hash table, because we
13676 also have the parent/sibling/child chains; only those that we
13677 might refer to by offset later during partial symbol reading.
13679 For now this means things that might have be the target of a
13680 DW_AT_specification, DW_AT_abstract_origin, or
13681 DW_AT_extension. DW_AT_extension will refer only to
13682 namespaces; DW_AT_abstract_origin refers to functions (and
13683 many things under the function DIE, but we do not recurse
13684 into function DIEs during partial symbol reading) and
13685 possibly variables as well; DW_AT_specification refers to
13686 declarations. Declarations ought to have the DW_AT_declaration
13687 flag. It happens that GCC forgets to put it in sometimes, but
13688 only for functions, not for types.
13690 Adding more things than necessary to the hash table is harmless
13691 except for the performance cost. Adding too few will result in
13692 wasted time in find_partial_die, when we reread the compilation
13693 unit with load_all_dies set. */
13696 || abbrev->tag == DW_TAG_constant
13697 || abbrev->tag == DW_TAG_subprogram
13698 || abbrev->tag == DW_TAG_variable
13699 || abbrev->tag == DW_TAG_namespace
13700 || part_die->is_declaration)
13704 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
13705 part_die->offset.sect_off, INSERT);
13709 part_die = obstack_alloc (&cu->comp_unit_obstack,
13710 sizeof (struct partial_die_info));
13712 /* For some DIEs we want to follow their children (if any). For C
13713 we have no reason to follow the children of structures; for other
13714 languages we have to, so that we can get at method physnames
13715 to infer fully qualified class names, for DW_AT_specification,
13716 and for C++ template arguments. For C++, we also look one level
13717 inside functions to find template arguments (if the name of the
13718 function does not already contain the template arguments).
13720 For Ada, we need to scan the children of subprograms and lexical
13721 blocks as well because Ada allows the definition of nested
13722 entities that could be interesting for the debugger, such as
13723 nested subprograms for instance. */
13724 if (last_die->has_children
13726 || last_die->tag == DW_TAG_namespace
13727 || last_die->tag == DW_TAG_module
13728 || last_die->tag == DW_TAG_enumeration_type
13729 || (cu->language == language_cplus
13730 && last_die->tag == DW_TAG_subprogram
13731 && (last_die->name == NULL
13732 || strchr (last_die->name, '<') == NULL))
13733 || (cu->language != language_c
13734 && (last_die->tag == DW_TAG_class_type
13735 || last_die->tag == DW_TAG_interface_type
13736 || last_die->tag == DW_TAG_structure_type
13737 || last_die->tag == DW_TAG_union_type))
13738 || (cu->language == language_ada
13739 && (last_die->tag == DW_TAG_subprogram
13740 || last_die->tag == DW_TAG_lexical_block))))
13743 parent_die = last_die;
13747 /* Otherwise we skip to the next sibling, if any. */
13748 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
13750 /* Back to the top, do it again. */
13754 /* Read a minimal amount of information into the minimal die structure. */
13756 static const gdb_byte *
13757 read_partial_die (const struct die_reader_specs *reader,
13758 struct partial_die_info *part_die,
13759 struct abbrev_info *abbrev, unsigned int abbrev_len,
13760 const gdb_byte *info_ptr)
13762 struct dwarf2_cu *cu = reader->cu;
13763 struct objfile *objfile = cu->objfile;
13764 const gdb_byte *buffer = reader->buffer;
13766 struct attribute attr;
13767 int has_low_pc_attr = 0;
13768 int has_high_pc_attr = 0;
13769 int high_pc_relative = 0;
13771 memset (part_die, 0, sizeof (struct partial_die_info));
13773 part_die->offset.sect_off = info_ptr - buffer;
13775 info_ptr += abbrev_len;
13777 if (abbrev == NULL)
13780 part_die->tag = abbrev->tag;
13781 part_die->has_children = abbrev->has_children;
13783 for (i = 0; i < abbrev->num_attrs; ++i)
13785 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
13787 /* Store the data if it is of an attribute we want to keep in a
13788 partial symbol table. */
13792 switch (part_die->tag)
13794 case DW_TAG_compile_unit:
13795 case DW_TAG_partial_unit:
13796 case DW_TAG_type_unit:
13797 /* Compilation units have a DW_AT_name that is a filename, not
13798 a source language identifier. */
13799 case DW_TAG_enumeration_type:
13800 case DW_TAG_enumerator:
13801 /* These tags always have simple identifiers already; no need
13802 to canonicalize them. */
13803 part_die->name = DW_STRING (&attr);
13807 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
13808 &objfile->objfile_obstack);
13812 case DW_AT_linkage_name:
13813 case DW_AT_MIPS_linkage_name:
13814 /* Note that both forms of linkage name might appear. We
13815 assume they will be the same, and we only store the last
13817 if (cu->language == language_ada)
13818 part_die->name = DW_STRING (&attr);
13819 part_die->linkage_name = DW_STRING (&attr);
13822 has_low_pc_attr = 1;
13823 part_die->lowpc = DW_ADDR (&attr);
13825 case DW_AT_high_pc:
13826 has_high_pc_attr = 1;
13827 if (attr.form == DW_FORM_addr
13828 || attr.form == DW_FORM_GNU_addr_index)
13829 part_die->highpc = DW_ADDR (&attr);
13832 high_pc_relative = 1;
13833 part_die->highpc = DW_UNSND (&attr);
13836 case DW_AT_location:
13837 /* Support the .debug_loc offsets. */
13838 if (attr_form_is_block (&attr))
13840 part_die->d.locdesc = DW_BLOCK (&attr);
13842 else if (attr_form_is_section_offset (&attr))
13844 dwarf2_complex_location_expr_complaint ();
13848 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13849 "partial symbol information");
13852 case DW_AT_external:
13853 part_die->is_external = DW_UNSND (&attr);
13855 case DW_AT_declaration:
13856 part_die->is_declaration = DW_UNSND (&attr);
13859 part_die->has_type = 1;
13861 case DW_AT_abstract_origin:
13862 case DW_AT_specification:
13863 case DW_AT_extension:
13864 part_die->has_specification = 1;
13865 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
13866 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13867 || cu->per_cu->is_dwz);
13869 case DW_AT_sibling:
13870 /* Ignore absolute siblings, they might point outside of
13871 the current compile unit. */
13872 if (attr.form == DW_FORM_ref_addr)
13873 complaint (&symfile_complaints,
13874 _("ignoring absolute DW_AT_sibling"));
13876 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
13878 case DW_AT_byte_size:
13879 part_die->has_byte_size = 1;
13881 case DW_AT_calling_convention:
13882 /* DWARF doesn't provide a way to identify a program's source-level
13883 entry point. DW_AT_calling_convention attributes are only meant
13884 to describe functions' calling conventions.
13886 However, because it's a necessary piece of information in
13887 Fortran, and because DW_CC_program is the only piece of debugging
13888 information whose definition refers to a 'main program' at all,
13889 several compilers have begun marking Fortran main programs with
13890 DW_CC_program --- even when those functions use the standard
13891 calling conventions.
13893 So until DWARF specifies a way to provide this information and
13894 compilers pick up the new representation, we'll support this
13896 if (DW_UNSND (&attr) == DW_CC_program
13897 && cu->language == language_fortran)
13899 set_main_name (part_die->name);
13901 /* As this DIE has a static linkage the name would be difficult
13902 to look up later. */
13903 language_of_main = language_fortran;
13907 if (DW_UNSND (&attr) == DW_INL_inlined
13908 || DW_UNSND (&attr) == DW_INL_declared_inlined)
13909 part_die->may_be_inlined = 1;
13913 if (part_die->tag == DW_TAG_imported_unit)
13915 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
13916 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13917 || cu->per_cu->is_dwz);
13926 if (high_pc_relative)
13927 part_die->highpc += part_die->lowpc;
13929 if (has_low_pc_attr && has_high_pc_attr)
13931 /* When using the GNU linker, .gnu.linkonce. sections are used to
13932 eliminate duplicate copies of functions and vtables and such.
13933 The linker will arbitrarily choose one and discard the others.
13934 The AT_*_pc values for such functions refer to local labels in
13935 these sections. If the section from that file was discarded, the
13936 labels are not in the output, so the relocs get a value of 0.
13937 If this is a discarded function, mark the pc bounds as invalid,
13938 so that GDB will ignore it. */
13939 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
13941 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13943 complaint (&symfile_complaints,
13944 _("DW_AT_low_pc %s is zero "
13945 "for DIE at 0x%x [in module %s]"),
13946 paddress (gdbarch, part_die->lowpc),
13947 part_die->offset.sect_off, objfile->name);
13949 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
13950 else if (part_die->lowpc >= part_die->highpc)
13952 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13954 complaint (&symfile_complaints,
13955 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
13956 "for DIE at 0x%x [in module %s]"),
13957 paddress (gdbarch, part_die->lowpc),
13958 paddress (gdbarch, part_die->highpc),
13959 part_die->offset.sect_off, objfile->name);
13962 part_die->has_pc_info = 1;
13968 /* Find a cached partial DIE at OFFSET in CU. */
13970 static struct partial_die_info *
13971 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
13973 struct partial_die_info *lookup_die = NULL;
13974 struct partial_die_info part_die;
13976 part_die.offset = offset;
13977 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
13983 /* Find a partial DIE at OFFSET, which may or may not be in CU,
13984 except in the case of .debug_types DIEs which do not reference
13985 outside their CU (they do however referencing other types via
13986 DW_FORM_ref_sig8). */
13988 static struct partial_die_info *
13989 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
13991 struct objfile *objfile = cu->objfile;
13992 struct dwarf2_per_cu_data *per_cu = NULL;
13993 struct partial_die_info *pd = NULL;
13995 if (offset_in_dwz == cu->per_cu->is_dwz
13996 && offset_in_cu_p (&cu->header, offset))
13998 pd = find_partial_die_in_comp_unit (offset, cu);
14001 /* We missed recording what we needed.
14002 Load all dies and try again. */
14003 per_cu = cu->per_cu;
14007 /* TUs don't reference other CUs/TUs (except via type signatures). */
14008 if (cu->per_cu->is_debug_types)
14010 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14011 " external reference to offset 0x%lx [in module %s].\n"),
14012 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14013 bfd_get_filename (objfile->obfd));
14015 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14018 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14019 load_partial_comp_unit (per_cu);
14021 per_cu->cu->last_used = 0;
14022 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14025 /* If we didn't find it, and not all dies have been loaded,
14026 load them all and try again. */
14028 if (pd == NULL && per_cu->load_all_dies == 0)
14030 per_cu->load_all_dies = 1;
14032 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14033 THIS_CU->cu may already be in use. So we can't just free it and
14034 replace its DIEs with the ones we read in. Instead, we leave those
14035 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14036 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14038 load_partial_comp_unit (per_cu);
14040 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14044 internal_error (__FILE__, __LINE__,
14045 _("could not find partial DIE 0x%x "
14046 "in cache [from module %s]\n"),
14047 offset.sect_off, bfd_get_filename (objfile->obfd));
14051 /* See if we can figure out if the class lives in a namespace. We do
14052 this by looking for a member function; its demangled name will
14053 contain namespace info, if there is any. */
14056 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14057 struct dwarf2_cu *cu)
14059 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14060 what template types look like, because the demangler
14061 frequently doesn't give the same name as the debug info. We
14062 could fix this by only using the demangled name to get the
14063 prefix (but see comment in read_structure_type). */
14065 struct partial_die_info *real_pdi;
14066 struct partial_die_info *child_pdi;
14068 /* If this DIE (this DIE's specification, if any) has a parent, then
14069 we should not do this. We'll prepend the parent's fully qualified
14070 name when we create the partial symbol. */
14072 real_pdi = struct_pdi;
14073 while (real_pdi->has_specification)
14074 real_pdi = find_partial_die (real_pdi->spec_offset,
14075 real_pdi->spec_is_dwz, cu);
14077 if (real_pdi->die_parent != NULL)
14080 for (child_pdi = struct_pdi->die_child;
14082 child_pdi = child_pdi->die_sibling)
14084 if (child_pdi->tag == DW_TAG_subprogram
14085 && child_pdi->linkage_name != NULL)
14087 char *actual_class_name
14088 = language_class_name_from_physname (cu->language_defn,
14089 child_pdi->linkage_name);
14090 if (actual_class_name != NULL)
14093 = obstack_copy0 (&cu->objfile->objfile_obstack,
14095 strlen (actual_class_name));
14096 xfree (actual_class_name);
14103 /* Adjust PART_DIE before generating a symbol for it. This function
14104 may set the is_external flag or change the DIE's name. */
14107 fixup_partial_die (struct partial_die_info *part_die,
14108 struct dwarf2_cu *cu)
14110 /* Once we've fixed up a die, there's no point in doing so again.
14111 This also avoids a memory leak if we were to call
14112 guess_partial_die_structure_name multiple times. */
14113 if (part_die->fixup_called)
14116 /* If we found a reference attribute and the DIE has no name, try
14117 to find a name in the referred to DIE. */
14119 if (part_die->name == NULL && part_die->has_specification)
14121 struct partial_die_info *spec_die;
14123 spec_die = find_partial_die (part_die->spec_offset,
14124 part_die->spec_is_dwz, cu);
14126 fixup_partial_die (spec_die, cu);
14128 if (spec_die->name)
14130 part_die->name = spec_die->name;
14132 /* Copy DW_AT_external attribute if it is set. */
14133 if (spec_die->is_external)
14134 part_die->is_external = spec_die->is_external;
14138 /* Set default names for some unnamed DIEs. */
14140 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14141 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14143 /* If there is no parent die to provide a namespace, and there are
14144 children, see if we can determine the namespace from their linkage
14146 if (cu->language == language_cplus
14147 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14148 && part_die->die_parent == NULL
14149 && part_die->has_children
14150 && (part_die->tag == DW_TAG_class_type
14151 || part_die->tag == DW_TAG_structure_type
14152 || part_die->tag == DW_TAG_union_type))
14153 guess_partial_die_structure_name (part_die, cu);
14155 /* GCC might emit a nameless struct or union that has a linkage
14156 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14157 if (part_die->name == NULL
14158 && (part_die->tag == DW_TAG_class_type
14159 || part_die->tag == DW_TAG_interface_type
14160 || part_die->tag == DW_TAG_structure_type
14161 || part_die->tag == DW_TAG_union_type)
14162 && part_die->linkage_name != NULL)
14166 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14171 /* Strip any leading namespaces/classes, keep only the base name.
14172 DW_AT_name for named DIEs does not contain the prefixes. */
14173 base = strrchr (demangled, ':');
14174 if (base && base > demangled && base[-1] == ':')
14179 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14180 base, strlen (base));
14185 part_die->fixup_called = 1;
14188 /* Read an attribute value described by an attribute form. */
14190 static const gdb_byte *
14191 read_attribute_value (const struct die_reader_specs *reader,
14192 struct attribute *attr, unsigned form,
14193 const gdb_byte *info_ptr)
14195 struct dwarf2_cu *cu = reader->cu;
14196 bfd *abfd = reader->abfd;
14197 struct comp_unit_head *cu_header = &cu->header;
14198 unsigned int bytes_read;
14199 struct dwarf_block *blk;
14204 case DW_FORM_ref_addr:
14205 if (cu->header.version == 2)
14206 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14208 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14209 &cu->header, &bytes_read);
14210 info_ptr += bytes_read;
14212 case DW_FORM_GNU_ref_alt:
14213 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14214 info_ptr += bytes_read;
14217 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14218 info_ptr += bytes_read;
14220 case DW_FORM_block2:
14221 blk = dwarf_alloc_block (cu);
14222 blk->size = read_2_bytes (abfd, info_ptr);
14224 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14225 info_ptr += blk->size;
14226 DW_BLOCK (attr) = blk;
14228 case DW_FORM_block4:
14229 blk = dwarf_alloc_block (cu);
14230 blk->size = read_4_bytes (abfd, info_ptr);
14232 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14233 info_ptr += blk->size;
14234 DW_BLOCK (attr) = blk;
14236 case DW_FORM_data2:
14237 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14240 case DW_FORM_data4:
14241 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14244 case DW_FORM_data8:
14245 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14248 case DW_FORM_sec_offset:
14249 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14250 info_ptr += bytes_read;
14252 case DW_FORM_string:
14253 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14254 DW_STRING_IS_CANONICAL (attr) = 0;
14255 info_ptr += bytes_read;
14258 if (!cu->per_cu->is_dwz)
14260 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14262 DW_STRING_IS_CANONICAL (attr) = 0;
14263 info_ptr += bytes_read;
14267 case DW_FORM_GNU_strp_alt:
14269 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14270 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14273 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14274 DW_STRING_IS_CANONICAL (attr) = 0;
14275 info_ptr += bytes_read;
14278 case DW_FORM_exprloc:
14279 case DW_FORM_block:
14280 blk = dwarf_alloc_block (cu);
14281 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14282 info_ptr += bytes_read;
14283 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14284 info_ptr += blk->size;
14285 DW_BLOCK (attr) = blk;
14287 case DW_FORM_block1:
14288 blk = dwarf_alloc_block (cu);
14289 blk->size = read_1_byte (abfd, info_ptr);
14291 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14292 info_ptr += blk->size;
14293 DW_BLOCK (attr) = blk;
14295 case DW_FORM_data1:
14296 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14300 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14303 case DW_FORM_flag_present:
14304 DW_UNSND (attr) = 1;
14306 case DW_FORM_sdata:
14307 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14308 info_ptr += bytes_read;
14310 case DW_FORM_udata:
14311 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14312 info_ptr += bytes_read;
14315 DW_UNSND (attr) = (cu->header.offset.sect_off
14316 + read_1_byte (abfd, info_ptr));
14320 DW_UNSND (attr) = (cu->header.offset.sect_off
14321 + read_2_bytes (abfd, info_ptr));
14325 DW_UNSND (attr) = (cu->header.offset.sect_off
14326 + read_4_bytes (abfd, info_ptr));
14330 DW_UNSND (attr) = (cu->header.offset.sect_off
14331 + read_8_bytes (abfd, info_ptr));
14334 case DW_FORM_ref_sig8:
14335 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14338 case DW_FORM_ref_udata:
14339 DW_UNSND (attr) = (cu->header.offset.sect_off
14340 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14341 info_ptr += bytes_read;
14343 case DW_FORM_indirect:
14344 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14345 info_ptr += bytes_read;
14346 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14348 case DW_FORM_GNU_addr_index:
14349 if (reader->dwo_file == NULL)
14351 /* For now flag a hard error.
14352 Later we can turn this into a complaint. */
14353 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14354 dwarf_form_name (form),
14355 bfd_get_filename (abfd));
14357 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14358 info_ptr += bytes_read;
14360 case DW_FORM_GNU_str_index:
14361 if (reader->dwo_file == NULL)
14363 /* For now flag a hard error.
14364 Later we can turn this into a complaint if warranted. */
14365 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14366 dwarf_form_name (form),
14367 bfd_get_filename (abfd));
14370 ULONGEST str_index =
14371 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14373 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14374 DW_STRING_IS_CANONICAL (attr) = 0;
14375 info_ptr += bytes_read;
14379 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14380 dwarf_form_name (form),
14381 bfd_get_filename (abfd));
14385 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14386 attr->form = DW_FORM_GNU_ref_alt;
14388 /* We have seen instances where the compiler tried to emit a byte
14389 size attribute of -1 which ended up being encoded as an unsigned
14390 0xffffffff. Although 0xffffffff is technically a valid size value,
14391 an object of this size seems pretty unlikely so we can relatively
14392 safely treat these cases as if the size attribute was invalid and
14393 treat them as zero by default. */
14394 if (attr->name == DW_AT_byte_size
14395 && form == DW_FORM_data4
14396 && DW_UNSND (attr) >= 0xffffffff)
14399 (&symfile_complaints,
14400 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14401 hex_string (DW_UNSND (attr)));
14402 DW_UNSND (attr) = 0;
14408 /* Read an attribute described by an abbreviated attribute. */
14410 static const gdb_byte *
14411 read_attribute (const struct die_reader_specs *reader,
14412 struct attribute *attr, struct attr_abbrev *abbrev,
14413 const gdb_byte *info_ptr)
14415 attr->name = abbrev->name;
14416 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14419 /* Read dwarf information from a buffer. */
14421 static unsigned int
14422 read_1_byte (bfd *abfd, const gdb_byte *buf)
14424 return bfd_get_8 (abfd, buf);
14428 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14430 return bfd_get_signed_8 (abfd, buf);
14433 static unsigned int
14434 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14436 return bfd_get_16 (abfd, buf);
14440 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14442 return bfd_get_signed_16 (abfd, buf);
14445 static unsigned int
14446 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14448 return bfd_get_32 (abfd, buf);
14452 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14454 return bfd_get_signed_32 (abfd, buf);
14458 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14460 return bfd_get_64 (abfd, buf);
14464 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14465 unsigned int *bytes_read)
14467 struct comp_unit_head *cu_header = &cu->header;
14468 CORE_ADDR retval = 0;
14470 if (cu_header->signed_addr_p)
14472 switch (cu_header->addr_size)
14475 retval = bfd_get_signed_16 (abfd, buf);
14478 retval = bfd_get_signed_32 (abfd, buf);
14481 retval = bfd_get_signed_64 (abfd, buf);
14484 internal_error (__FILE__, __LINE__,
14485 _("read_address: bad switch, signed [in module %s]"),
14486 bfd_get_filename (abfd));
14491 switch (cu_header->addr_size)
14494 retval = bfd_get_16 (abfd, buf);
14497 retval = bfd_get_32 (abfd, buf);
14500 retval = bfd_get_64 (abfd, buf);
14503 internal_error (__FILE__, __LINE__,
14504 _("read_address: bad switch, "
14505 "unsigned [in module %s]"),
14506 bfd_get_filename (abfd));
14510 *bytes_read = cu_header->addr_size;
14514 /* Read the initial length from a section. The (draft) DWARF 3
14515 specification allows the initial length to take up either 4 bytes
14516 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14517 bytes describe the length and all offsets will be 8 bytes in length
14520 An older, non-standard 64-bit format is also handled by this
14521 function. The older format in question stores the initial length
14522 as an 8-byte quantity without an escape value. Lengths greater
14523 than 2^32 aren't very common which means that the initial 4 bytes
14524 is almost always zero. Since a length value of zero doesn't make
14525 sense for the 32-bit format, this initial zero can be considered to
14526 be an escape value which indicates the presence of the older 64-bit
14527 format. As written, the code can't detect (old format) lengths
14528 greater than 4GB. If it becomes necessary to handle lengths
14529 somewhat larger than 4GB, we could allow other small values (such
14530 as the non-sensical values of 1, 2, and 3) to also be used as
14531 escape values indicating the presence of the old format.
14533 The value returned via bytes_read should be used to increment the
14534 relevant pointer after calling read_initial_length().
14536 [ Note: read_initial_length() and read_offset() are based on the
14537 document entitled "DWARF Debugging Information Format", revision
14538 3, draft 8, dated November 19, 2001. This document was obtained
14541 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14543 This document is only a draft and is subject to change. (So beware.)
14545 Details regarding the older, non-standard 64-bit format were
14546 determined empirically by examining 64-bit ELF files produced by
14547 the SGI toolchain on an IRIX 6.5 machine.
14549 - Kevin, July 16, 2002
14553 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
14555 LONGEST length = bfd_get_32 (abfd, buf);
14557 if (length == 0xffffffff)
14559 length = bfd_get_64 (abfd, buf + 4);
14562 else if (length == 0)
14564 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
14565 length = bfd_get_64 (abfd, buf);
14576 /* Cover function for read_initial_length.
14577 Returns the length of the object at BUF, and stores the size of the
14578 initial length in *BYTES_READ and stores the size that offsets will be in
14580 If the initial length size is not equivalent to that specified in
14581 CU_HEADER then issue a complaint.
14582 This is useful when reading non-comp-unit headers. */
14585 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
14586 const struct comp_unit_head *cu_header,
14587 unsigned int *bytes_read,
14588 unsigned int *offset_size)
14590 LONGEST length = read_initial_length (abfd, buf, bytes_read);
14592 gdb_assert (cu_header->initial_length_size == 4
14593 || cu_header->initial_length_size == 8
14594 || cu_header->initial_length_size == 12);
14596 if (cu_header->initial_length_size != *bytes_read)
14597 complaint (&symfile_complaints,
14598 _("intermixed 32-bit and 64-bit DWARF sections"));
14600 *offset_size = (*bytes_read == 4) ? 4 : 8;
14604 /* Read an offset from the data stream. The size of the offset is
14605 given by cu_header->offset_size. */
14608 read_offset (bfd *abfd, const gdb_byte *buf,
14609 const struct comp_unit_head *cu_header,
14610 unsigned int *bytes_read)
14612 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
14614 *bytes_read = cu_header->offset_size;
14618 /* Read an offset from the data stream. */
14621 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
14623 LONGEST retval = 0;
14625 switch (offset_size)
14628 retval = bfd_get_32 (abfd, buf);
14631 retval = bfd_get_64 (abfd, buf);
14634 internal_error (__FILE__, __LINE__,
14635 _("read_offset_1: bad switch [in module %s]"),
14636 bfd_get_filename (abfd));
14642 static const gdb_byte *
14643 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
14645 /* If the size of a host char is 8 bits, we can return a pointer
14646 to the buffer, otherwise we have to copy the data to a buffer
14647 allocated on the temporary obstack. */
14648 gdb_assert (HOST_CHAR_BIT == 8);
14652 static const char *
14653 read_direct_string (bfd *abfd, const gdb_byte *buf,
14654 unsigned int *bytes_read_ptr)
14656 /* If the size of a host char is 8 bits, we can return a pointer
14657 to the string, otherwise we have to copy the string to a buffer
14658 allocated on the temporary obstack. */
14659 gdb_assert (HOST_CHAR_BIT == 8);
14662 *bytes_read_ptr = 1;
14665 *bytes_read_ptr = strlen ((const char *) buf) + 1;
14666 return (const char *) buf;
14669 static const char *
14670 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
14672 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
14673 if (dwarf2_per_objfile->str.buffer == NULL)
14674 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
14675 bfd_get_filename (abfd));
14676 if (str_offset >= dwarf2_per_objfile->str.size)
14677 error (_("DW_FORM_strp pointing outside of "
14678 ".debug_str section [in module %s]"),
14679 bfd_get_filename (abfd));
14680 gdb_assert (HOST_CHAR_BIT == 8);
14681 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
14683 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
14686 /* Read a string at offset STR_OFFSET in the .debug_str section from
14687 the .dwz file DWZ. Throw an error if the offset is too large. If
14688 the string consists of a single NUL byte, return NULL; otherwise
14689 return a pointer to the string. */
14691 static const char *
14692 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
14694 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
14696 if (dwz->str.buffer == NULL)
14697 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
14698 "section [in module %s]"),
14699 bfd_get_filename (dwz->dwz_bfd));
14700 if (str_offset >= dwz->str.size)
14701 error (_("DW_FORM_GNU_strp_alt pointing outside of "
14702 ".debug_str section [in module %s]"),
14703 bfd_get_filename (dwz->dwz_bfd));
14704 gdb_assert (HOST_CHAR_BIT == 8);
14705 if (dwz->str.buffer[str_offset] == '\0')
14707 return (const char *) (dwz->str.buffer + str_offset);
14710 static const char *
14711 read_indirect_string (bfd *abfd, const gdb_byte *buf,
14712 const struct comp_unit_head *cu_header,
14713 unsigned int *bytes_read_ptr)
14715 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
14717 return read_indirect_string_at_offset (abfd, str_offset);
14721 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
14722 unsigned int *bytes_read_ptr)
14725 unsigned int num_read;
14727 unsigned char byte;
14735 byte = bfd_get_8 (abfd, buf);
14738 result |= ((ULONGEST) (byte & 127) << shift);
14739 if ((byte & 128) == 0)
14745 *bytes_read_ptr = num_read;
14750 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
14751 unsigned int *bytes_read_ptr)
14754 int i, shift, num_read;
14755 unsigned char byte;
14763 byte = bfd_get_8 (abfd, buf);
14766 result |= ((LONGEST) (byte & 127) << shift);
14768 if ((byte & 128) == 0)
14773 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
14774 result |= -(((LONGEST) 1) << shift);
14775 *bytes_read_ptr = num_read;
14779 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
14780 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
14781 ADDR_SIZE is the size of addresses from the CU header. */
14784 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
14786 struct objfile *objfile = dwarf2_per_objfile->objfile;
14787 bfd *abfd = objfile->obfd;
14788 const gdb_byte *info_ptr;
14790 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
14791 if (dwarf2_per_objfile->addr.buffer == NULL)
14792 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
14794 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
14795 error (_("DW_FORM_addr_index pointing outside of "
14796 ".debug_addr section [in module %s]"),
14798 info_ptr = (dwarf2_per_objfile->addr.buffer
14799 + addr_base + addr_index * addr_size);
14800 if (addr_size == 4)
14801 return bfd_get_32 (abfd, info_ptr);
14803 return bfd_get_64 (abfd, info_ptr);
14806 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
14809 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
14811 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
14814 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
14817 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
14818 unsigned int *bytes_read)
14820 bfd *abfd = cu->objfile->obfd;
14821 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
14823 return read_addr_index (cu, addr_index);
14826 /* Data structure to pass results from dwarf2_read_addr_index_reader
14827 back to dwarf2_read_addr_index. */
14829 struct dwarf2_read_addr_index_data
14831 ULONGEST addr_base;
14835 /* die_reader_func for dwarf2_read_addr_index. */
14838 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
14839 const gdb_byte *info_ptr,
14840 struct die_info *comp_unit_die,
14844 struct dwarf2_cu *cu = reader->cu;
14845 struct dwarf2_read_addr_index_data *aidata =
14846 (struct dwarf2_read_addr_index_data *) data;
14848 aidata->addr_base = cu->addr_base;
14849 aidata->addr_size = cu->header.addr_size;
14852 /* Given an index in .debug_addr, fetch the value.
14853 NOTE: This can be called during dwarf expression evaluation,
14854 long after the debug information has been read, and thus per_cu->cu
14855 may no longer exist. */
14858 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
14859 unsigned int addr_index)
14861 struct objfile *objfile = per_cu->objfile;
14862 struct dwarf2_cu *cu = per_cu->cu;
14863 ULONGEST addr_base;
14866 /* This is intended to be called from outside this file. */
14867 dw2_setup (objfile);
14869 /* We need addr_base and addr_size.
14870 If we don't have PER_CU->cu, we have to get it.
14871 Nasty, but the alternative is storing the needed info in PER_CU,
14872 which at this point doesn't seem justified: it's not clear how frequently
14873 it would get used and it would increase the size of every PER_CU.
14874 Entry points like dwarf2_per_cu_addr_size do a similar thing
14875 so we're not in uncharted territory here.
14876 Alas we need to be a bit more complicated as addr_base is contained
14879 We don't need to read the entire CU(/TU).
14880 We just need the header and top level die.
14882 IWBN to use the aging mechanism to let us lazily later discard the CU.
14883 For now we skip this optimization. */
14887 addr_base = cu->addr_base;
14888 addr_size = cu->header.addr_size;
14892 struct dwarf2_read_addr_index_data aidata;
14894 /* Note: We can't use init_cutu_and_read_dies_simple here,
14895 we need addr_base. */
14896 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
14897 dwarf2_read_addr_index_reader, &aidata);
14898 addr_base = aidata.addr_base;
14899 addr_size = aidata.addr_size;
14902 return read_addr_index_1 (addr_index, addr_base, addr_size);
14905 /* Given a DW_AT_str_index, fetch the string. */
14907 static const char *
14908 read_str_index (const struct die_reader_specs *reader,
14909 struct dwarf2_cu *cu, ULONGEST str_index)
14911 struct objfile *objfile = dwarf2_per_objfile->objfile;
14912 const char *dwo_name = objfile->name;
14913 bfd *abfd = objfile->obfd;
14914 struct dwo_sections *sections = &reader->dwo_file->sections;
14915 const gdb_byte *info_ptr;
14916 ULONGEST str_offset;
14918 dwarf2_read_section (objfile, §ions->str);
14919 dwarf2_read_section (objfile, §ions->str_offsets);
14920 if (sections->str.buffer == NULL)
14921 error (_("DW_FORM_str_index used without .debug_str.dwo section"
14922 " in CU at offset 0x%lx [in module %s]"),
14923 (long) cu->header.offset.sect_off, dwo_name);
14924 if (sections->str_offsets.buffer == NULL)
14925 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
14926 " in CU at offset 0x%lx [in module %s]"),
14927 (long) cu->header.offset.sect_off, dwo_name);
14928 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
14929 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
14930 " section in CU at offset 0x%lx [in module %s]"),
14931 (long) cu->header.offset.sect_off, dwo_name);
14932 info_ptr = (sections->str_offsets.buffer
14933 + str_index * cu->header.offset_size);
14934 if (cu->header.offset_size == 4)
14935 str_offset = bfd_get_32 (abfd, info_ptr);
14937 str_offset = bfd_get_64 (abfd, info_ptr);
14938 if (str_offset >= sections->str.size)
14939 error (_("Offset from DW_FORM_str_index pointing outside of"
14940 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
14941 (long) cu->header.offset.sect_off, dwo_name);
14942 return (const char *) (sections->str.buffer + str_offset);
14945 /* Return the length of an LEB128 number in BUF. */
14948 leb128_size (const gdb_byte *buf)
14950 const gdb_byte *begin = buf;
14956 if ((byte & 128) == 0)
14957 return buf - begin;
14962 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
14969 cu->language = language_c;
14971 case DW_LANG_C_plus_plus:
14972 cu->language = language_cplus;
14975 cu->language = language_d;
14977 case DW_LANG_Fortran77:
14978 case DW_LANG_Fortran90:
14979 case DW_LANG_Fortran95:
14980 cu->language = language_fortran;
14983 cu->language = language_go;
14985 case DW_LANG_Mips_Assembler:
14986 cu->language = language_asm;
14989 cu->language = language_java;
14991 case DW_LANG_Ada83:
14992 case DW_LANG_Ada95:
14993 cu->language = language_ada;
14995 case DW_LANG_Modula2:
14996 cu->language = language_m2;
14998 case DW_LANG_Pascal83:
14999 cu->language = language_pascal;
15002 cu->language = language_objc;
15004 case DW_LANG_Cobol74:
15005 case DW_LANG_Cobol85:
15007 cu->language = language_minimal;
15010 cu->language_defn = language_def (cu->language);
15013 /* Return the named attribute or NULL if not there. */
15015 static struct attribute *
15016 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15021 struct attribute *spec = NULL;
15023 for (i = 0; i < die->num_attrs; ++i)
15025 if (die->attrs[i].name == name)
15026 return &die->attrs[i];
15027 if (die->attrs[i].name == DW_AT_specification
15028 || die->attrs[i].name == DW_AT_abstract_origin)
15029 spec = &die->attrs[i];
15035 die = follow_die_ref (die, spec, &cu);
15041 /* Return the named attribute or NULL if not there,
15042 but do not follow DW_AT_specification, etc.
15043 This is for use in contexts where we're reading .debug_types dies.
15044 Following DW_AT_specification, DW_AT_abstract_origin will take us
15045 back up the chain, and we want to go down. */
15047 static struct attribute *
15048 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15052 for (i = 0; i < die->num_attrs; ++i)
15053 if (die->attrs[i].name == name)
15054 return &die->attrs[i];
15059 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15060 and holds a non-zero value. This function should only be used for
15061 DW_FORM_flag or DW_FORM_flag_present attributes. */
15064 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15066 struct attribute *attr = dwarf2_attr (die, name, cu);
15068 return (attr && DW_UNSND (attr));
15072 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15074 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15075 which value is non-zero. However, we have to be careful with
15076 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15077 (via dwarf2_flag_true_p) follows this attribute. So we may
15078 end up accidently finding a declaration attribute that belongs
15079 to a different DIE referenced by the specification attribute,
15080 even though the given DIE does not have a declaration attribute. */
15081 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15082 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15085 /* Return the die giving the specification for DIE, if there is
15086 one. *SPEC_CU is the CU containing DIE on input, and the CU
15087 containing the return value on output. If there is no
15088 specification, but there is an abstract origin, that is
15091 static struct die_info *
15092 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15094 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15097 if (spec_attr == NULL)
15098 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15100 if (spec_attr == NULL)
15103 return follow_die_ref (die, spec_attr, spec_cu);
15106 /* Free the line_header structure *LH, and any arrays and strings it
15108 NOTE: This is also used as a "cleanup" function. */
15111 free_line_header (struct line_header *lh)
15113 if (lh->standard_opcode_lengths)
15114 xfree (lh->standard_opcode_lengths);
15116 /* Remember that all the lh->file_names[i].name pointers are
15117 pointers into debug_line_buffer, and don't need to be freed. */
15118 if (lh->file_names)
15119 xfree (lh->file_names);
15121 /* Similarly for the include directory names. */
15122 if (lh->include_dirs)
15123 xfree (lh->include_dirs);
15128 /* Add an entry to LH's include directory table. */
15131 add_include_dir (struct line_header *lh, const char *include_dir)
15133 /* Grow the array if necessary. */
15134 if (lh->include_dirs_size == 0)
15136 lh->include_dirs_size = 1; /* for testing */
15137 lh->include_dirs = xmalloc (lh->include_dirs_size
15138 * sizeof (*lh->include_dirs));
15140 else if (lh->num_include_dirs >= lh->include_dirs_size)
15142 lh->include_dirs_size *= 2;
15143 lh->include_dirs = xrealloc (lh->include_dirs,
15144 (lh->include_dirs_size
15145 * sizeof (*lh->include_dirs)));
15148 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15151 /* Add an entry to LH's file name table. */
15154 add_file_name (struct line_header *lh,
15156 unsigned int dir_index,
15157 unsigned int mod_time,
15158 unsigned int length)
15160 struct file_entry *fe;
15162 /* Grow the array if necessary. */
15163 if (lh->file_names_size == 0)
15165 lh->file_names_size = 1; /* for testing */
15166 lh->file_names = xmalloc (lh->file_names_size
15167 * sizeof (*lh->file_names));
15169 else if (lh->num_file_names >= lh->file_names_size)
15171 lh->file_names_size *= 2;
15172 lh->file_names = xrealloc (lh->file_names,
15173 (lh->file_names_size
15174 * sizeof (*lh->file_names)));
15177 fe = &lh->file_names[lh->num_file_names++];
15179 fe->dir_index = dir_index;
15180 fe->mod_time = mod_time;
15181 fe->length = length;
15182 fe->included_p = 0;
15186 /* A convenience function to find the proper .debug_line section for a
15189 static struct dwarf2_section_info *
15190 get_debug_line_section (struct dwarf2_cu *cu)
15192 struct dwarf2_section_info *section;
15194 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15196 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15197 section = &cu->dwo_unit->dwo_file->sections.line;
15198 else if (cu->per_cu->is_dwz)
15200 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15202 section = &dwz->line;
15205 section = &dwarf2_per_objfile->line;
15210 /* Read the statement program header starting at OFFSET in
15211 .debug_line, or .debug_line.dwo. Return a pointer
15212 to a struct line_header, allocated using xmalloc.
15214 NOTE: the strings in the include directory and file name tables of
15215 the returned object point into the dwarf line section buffer,
15216 and must not be freed. */
15218 static struct line_header *
15219 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15221 struct cleanup *back_to;
15222 struct line_header *lh;
15223 const gdb_byte *line_ptr;
15224 unsigned int bytes_read, offset_size;
15226 const char *cur_dir, *cur_file;
15227 struct dwarf2_section_info *section;
15230 section = get_debug_line_section (cu);
15231 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15232 if (section->buffer == NULL)
15234 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15235 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15237 complaint (&symfile_complaints, _("missing .debug_line section"));
15241 /* We can't do this until we know the section is non-empty.
15242 Only then do we know we have such a section. */
15243 abfd = section->asection->owner;
15245 /* Make sure that at least there's room for the total_length field.
15246 That could be 12 bytes long, but we're just going to fudge that. */
15247 if (offset + 4 >= section->size)
15249 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15253 lh = xmalloc (sizeof (*lh));
15254 memset (lh, 0, sizeof (*lh));
15255 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15258 line_ptr = section->buffer + offset;
15260 /* Read in the header. */
15262 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15263 &bytes_read, &offset_size);
15264 line_ptr += bytes_read;
15265 if (line_ptr + lh->total_length > (section->buffer + section->size))
15267 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15270 lh->statement_program_end = line_ptr + lh->total_length;
15271 lh->version = read_2_bytes (abfd, line_ptr);
15273 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15274 line_ptr += offset_size;
15275 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15277 if (lh->version >= 4)
15279 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15283 lh->maximum_ops_per_instruction = 1;
15285 if (lh->maximum_ops_per_instruction == 0)
15287 lh->maximum_ops_per_instruction = 1;
15288 complaint (&symfile_complaints,
15289 _("invalid maximum_ops_per_instruction "
15290 "in `.debug_line' section"));
15293 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15295 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15297 lh->line_range = read_1_byte (abfd, line_ptr);
15299 lh->opcode_base = read_1_byte (abfd, line_ptr);
15301 lh->standard_opcode_lengths
15302 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15304 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15305 for (i = 1; i < lh->opcode_base; ++i)
15307 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15311 /* Read directory table. */
15312 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15314 line_ptr += bytes_read;
15315 add_include_dir (lh, cur_dir);
15317 line_ptr += bytes_read;
15319 /* Read file name table. */
15320 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15322 unsigned int dir_index, mod_time, length;
15324 line_ptr += bytes_read;
15325 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15326 line_ptr += bytes_read;
15327 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15328 line_ptr += bytes_read;
15329 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15330 line_ptr += bytes_read;
15332 add_file_name (lh, cur_file, dir_index, mod_time, length);
15334 line_ptr += bytes_read;
15335 lh->statement_program_start = line_ptr;
15337 if (line_ptr > (section->buffer + section->size))
15338 complaint (&symfile_complaints,
15339 _("line number info header doesn't "
15340 "fit in `.debug_line' section"));
15342 discard_cleanups (back_to);
15346 /* Subroutine of dwarf_decode_lines to simplify it.
15347 Return the file name of the psymtab for included file FILE_INDEX
15348 in line header LH of PST.
15349 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15350 If space for the result is malloc'd, it will be freed by a cleanup.
15351 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15353 The function creates dangling cleanup registration. */
15355 static const char *
15356 psymtab_include_file_name (const struct line_header *lh, int file_index,
15357 const struct partial_symtab *pst,
15358 const char *comp_dir)
15360 const struct file_entry fe = lh->file_names [file_index];
15361 const char *include_name = fe.name;
15362 const char *include_name_to_compare = include_name;
15363 const char *dir_name = NULL;
15364 const char *pst_filename;
15365 char *copied_name = NULL;
15369 dir_name = lh->include_dirs[fe.dir_index - 1];
15371 if (!IS_ABSOLUTE_PATH (include_name)
15372 && (dir_name != NULL || comp_dir != NULL))
15374 /* Avoid creating a duplicate psymtab for PST.
15375 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15376 Before we do the comparison, however, we need to account
15377 for DIR_NAME and COMP_DIR.
15378 First prepend dir_name (if non-NULL). If we still don't
15379 have an absolute path prepend comp_dir (if non-NULL).
15380 However, the directory we record in the include-file's
15381 psymtab does not contain COMP_DIR (to match the
15382 corresponding symtab(s)).
15387 bash$ gcc -g ./hello.c
15388 include_name = "hello.c"
15390 DW_AT_comp_dir = comp_dir = "/tmp"
15391 DW_AT_name = "./hello.c" */
15393 if (dir_name != NULL)
15395 char *tem = concat (dir_name, SLASH_STRING,
15396 include_name, (char *)NULL);
15398 make_cleanup (xfree, tem);
15399 include_name = tem;
15400 include_name_to_compare = include_name;
15402 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15404 char *tem = concat (comp_dir, SLASH_STRING,
15405 include_name, (char *)NULL);
15407 make_cleanup (xfree, tem);
15408 include_name_to_compare = tem;
15412 pst_filename = pst->filename;
15413 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15415 copied_name = concat (pst->dirname, SLASH_STRING,
15416 pst_filename, (char *)NULL);
15417 pst_filename = copied_name;
15420 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15422 if (copied_name != NULL)
15423 xfree (copied_name);
15427 return include_name;
15430 /* Ignore this record_line request. */
15433 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15438 /* Subroutine of dwarf_decode_lines to simplify it.
15439 Process the line number information in LH. */
15442 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15443 struct dwarf2_cu *cu, struct partial_symtab *pst)
15445 const gdb_byte *line_ptr, *extended_end;
15446 const gdb_byte *line_end;
15447 unsigned int bytes_read, extended_len;
15448 unsigned char op_code, extended_op, adj_opcode;
15449 CORE_ADDR baseaddr;
15450 struct objfile *objfile = cu->objfile;
15451 bfd *abfd = objfile->obfd;
15452 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15453 const int decode_for_pst_p = (pst != NULL);
15454 struct subfile *last_subfile = NULL;
15455 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15458 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15460 line_ptr = lh->statement_program_start;
15461 line_end = lh->statement_program_end;
15463 /* Read the statement sequences until there's nothing left. */
15464 while (line_ptr < line_end)
15466 /* state machine registers */
15467 CORE_ADDR address = 0;
15468 unsigned int file = 1;
15469 unsigned int line = 1;
15470 unsigned int column = 0;
15471 int is_stmt = lh->default_is_stmt;
15472 int basic_block = 0;
15473 int end_sequence = 0;
15475 unsigned char op_index = 0;
15477 if (!decode_for_pst_p && lh->num_file_names >= file)
15479 /* Start a subfile for the current file of the state machine. */
15480 /* lh->include_dirs and lh->file_names are 0-based, but the
15481 directory and file name numbers in the statement program
15483 struct file_entry *fe = &lh->file_names[file - 1];
15484 const char *dir = NULL;
15487 dir = lh->include_dirs[fe->dir_index - 1];
15489 dwarf2_start_subfile (fe->name, dir, comp_dir);
15492 /* Decode the table. */
15493 while (!end_sequence)
15495 op_code = read_1_byte (abfd, line_ptr);
15497 if (line_ptr > line_end)
15499 dwarf2_debug_line_missing_end_sequence_complaint ();
15503 if (op_code >= lh->opcode_base)
15505 /* Special operand. */
15506 adj_opcode = op_code - lh->opcode_base;
15507 address += (((op_index + (adj_opcode / lh->line_range))
15508 / lh->maximum_ops_per_instruction)
15509 * lh->minimum_instruction_length);
15510 op_index = ((op_index + (adj_opcode / lh->line_range))
15511 % lh->maximum_ops_per_instruction);
15512 line += lh->line_base + (adj_opcode % lh->line_range);
15513 if (lh->num_file_names < file || file == 0)
15514 dwarf2_debug_line_missing_file_complaint ();
15515 /* For now we ignore lines not starting on an
15516 instruction boundary. */
15517 else if (op_index == 0)
15519 lh->file_names[file - 1].included_p = 1;
15520 if (!decode_for_pst_p && is_stmt)
15522 if (last_subfile != current_subfile)
15524 addr = gdbarch_addr_bits_remove (gdbarch, address);
15526 (*p_record_line) (last_subfile, 0, addr);
15527 last_subfile = current_subfile;
15529 /* Append row to matrix using current values. */
15530 addr = gdbarch_addr_bits_remove (gdbarch, address);
15531 (*p_record_line) (current_subfile, line, addr);
15536 else switch (op_code)
15538 case DW_LNS_extended_op:
15539 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15541 line_ptr += bytes_read;
15542 extended_end = line_ptr + extended_len;
15543 extended_op = read_1_byte (abfd, line_ptr);
15545 switch (extended_op)
15547 case DW_LNE_end_sequence:
15548 p_record_line = record_line;
15551 case DW_LNE_set_address:
15552 address = read_address (abfd, line_ptr, cu, &bytes_read);
15554 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15556 /* This line table is for a function which has been
15557 GCd by the linker. Ignore it. PR gdb/12528 */
15560 = line_ptr - get_debug_line_section (cu)->buffer;
15562 complaint (&symfile_complaints,
15563 _(".debug_line address at offset 0x%lx is 0 "
15565 line_offset, objfile->name);
15566 p_record_line = noop_record_line;
15570 line_ptr += bytes_read;
15571 address += baseaddr;
15573 case DW_LNE_define_file:
15575 const char *cur_file;
15576 unsigned int dir_index, mod_time, length;
15578 cur_file = read_direct_string (abfd, line_ptr,
15580 line_ptr += bytes_read;
15582 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15583 line_ptr += bytes_read;
15585 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15586 line_ptr += bytes_read;
15588 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15589 line_ptr += bytes_read;
15590 add_file_name (lh, cur_file, dir_index, mod_time, length);
15593 case DW_LNE_set_discriminator:
15594 /* The discriminator is not interesting to the debugger;
15596 line_ptr = extended_end;
15599 complaint (&symfile_complaints,
15600 _("mangled .debug_line section"));
15603 /* Make sure that we parsed the extended op correctly. If e.g.
15604 we expected a different address size than the producer used,
15605 we may have read the wrong number of bytes. */
15606 if (line_ptr != extended_end)
15608 complaint (&symfile_complaints,
15609 _("mangled .debug_line section"));
15614 if (lh->num_file_names < file || file == 0)
15615 dwarf2_debug_line_missing_file_complaint ();
15618 lh->file_names[file - 1].included_p = 1;
15619 if (!decode_for_pst_p && is_stmt)
15621 if (last_subfile != current_subfile)
15623 addr = gdbarch_addr_bits_remove (gdbarch, address);
15625 (*p_record_line) (last_subfile, 0, addr);
15626 last_subfile = current_subfile;
15628 addr = gdbarch_addr_bits_remove (gdbarch, address);
15629 (*p_record_line) (current_subfile, line, addr);
15634 case DW_LNS_advance_pc:
15637 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15639 address += (((op_index + adjust)
15640 / lh->maximum_ops_per_instruction)
15641 * lh->minimum_instruction_length);
15642 op_index = ((op_index + adjust)
15643 % lh->maximum_ops_per_instruction);
15644 line_ptr += bytes_read;
15647 case DW_LNS_advance_line:
15648 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
15649 line_ptr += bytes_read;
15651 case DW_LNS_set_file:
15653 /* The arrays lh->include_dirs and lh->file_names are
15654 0-based, but the directory and file name numbers in
15655 the statement program are 1-based. */
15656 struct file_entry *fe;
15657 const char *dir = NULL;
15659 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15660 line_ptr += bytes_read;
15661 if (lh->num_file_names < file || file == 0)
15662 dwarf2_debug_line_missing_file_complaint ();
15665 fe = &lh->file_names[file - 1];
15667 dir = lh->include_dirs[fe->dir_index - 1];
15668 if (!decode_for_pst_p)
15670 last_subfile = current_subfile;
15671 dwarf2_start_subfile (fe->name, dir, comp_dir);
15676 case DW_LNS_set_column:
15677 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15678 line_ptr += bytes_read;
15680 case DW_LNS_negate_stmt:
15681 is_stmt = (!is_stmt);
15683 case DW_LNS_set_basic_block:
15686 /* Add to the address register of the state machine the
15687 address increment value corresponding to special opcode
15688 255. I.e., this value is scaled by the minimum
15689 instruction length since special opcode 255 would have
15690 scaled the increment. */
15691 case DW_LNS_const_add_pc:
15693 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
15695 address += (((op_index + adjust)
15696 / lh->maximum_ops_per_instruction)
15697 * lh->minimum_instruction_length);
15698 op_index = ((op_index + adjust)
15699 % lh->maximum_ops_per_instruction);
15702 case DW_LNS_fixed_advance_pc:
15703 address += read_2_bytes (abfd, line_ptr);
15709 /* Unknown standard opcode, ignore it. */
15712 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
15714 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15715 line_ptr += bytes_read;
15720 if (lh->num_file_names < file || file == 0)
15721 dwarf2_debug_line_missing_file_complaint ();
15724 lh->file_names[file - 1].included_p = 1;
15725 if (!decode_for_pst_p)
15727 addr = gdbarch_addr_bits_remove (gdbarch, address);
15728 (*p_record_line) (current_subfile, 0, addr);
15734 /* Decode the Line Number Program (LNP) for the given line_header
15735 structure and CU. The actual information extracted and the type
15736 of structures created from the LNP depends on the value of PST.
15738 1. If PST is NULL, then this procedure uses the data from the program
15739 to create all necessary symbol tables, and their linetables.
15741 2. If PST is not NULL, this procedure reads the program to determine
15742 the list of files included by the unit represented by PST, and
15743 builds all the associated partial symbol tables.
15745 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15746 It is used for relative paths in the line table.
15747 NOTE: When processing partial symtabs (pst != NULL),
15748 comp_dir == pst->dirname.
15750 NOTE: It is important that psymtabs have the same file name (via strcmp)
15751 as the corresponding symtab. Since COMP_DIR is not used in the name of the
15752 symtab we don't use it in the name of the psymtabs we create.
15753 E.g. expand_line_sal requires this when finding psymtabs to expand.
15754 A good testcase for this is mb-inline.exp. */
15757 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
15758 struct dwarf2_cu *cu, struct partial_symtab *pst,
15759 int want_line_info)
15761 struct objfile *objfile = cu->objfile;
15762 const int decode_for_pst_p = (pst != NULL);
15763 struct subfile *first_subfile = current_subfile;
15765 if (want_line_info)
15766 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
15768 if (decode_for_pst_p)
15772 /* Now that we're done scanning the Line Header Program, we can
15773 create the psymtab of each included file. */
15774 for (file_index = 0; file_index < lh->num_file_names; file_index++)
15775 if (lh->file_names[file_index].included_p == 1)
15777 const char *include_name =
15778 psymtab_include_file_name (lh, file_index, pst, comp_dir);
15779 if (include_name != NULL)
15780 dwarf2_create_include_psymtab (include_name, pst, objfile);
15785 /* Make sure a symtab is created for every file, even files
15786 which contain only variables (i.e. no code with associated
15790 for (i = 0; i < lh->num_file_names; i++)
15792 const char *dir = NULL;
15793 struct file_entry *fe;
15795 fe = &lh->file_names[i];
15797 dir = lh->include_dirs[fe->dir_index - 1];
15798 dwarf2_start_subfile (fe->name, dir, comp_dir);
15800 /* Skip the main file; we don't need it, and it must be
15801 allocated last, so that it will show up before the
15802 non-primary symtabs in the objfile's symtab list. */
15803 if (current_subfile == first_subfile)
15806 if (current_subfile->symtab == NULL)
15807 current_subfile->symtab = allocate_symtab (current_subfile->name,
15809 fe->symtab = current_subfile->symtab;
15814 /* Start a subfile for DWARF. FILENAME is the name of the file and
15815 DIRNAME the name of the source directory which contains FILENAME
15816 or NULL if not known. COMP_DIR is the compilation directory for the
15817 linetable's compilation unit or NULL if not known.
15818 This routine tries to keep line numbers from identical absolute and
15819 relative file names in a common subfile.
15821 Using the `list' example from the GDB testsuite, which resides in
15822 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
15823 of /srcdir/list0.c yields the following debugging information for list0.c:
15825 DW_AT_name: /srcdir/list0.c
15826 DW_AT_comp_dir: /compdir
15827 files.files[0].name: list0.h
15828 files.files[0].dir: /srcdir
15829 files.files[1].name: list0.c
15830 files.files[1].dir: /srcdir
15832 The line number information for list0.c has to end up in a single
15833 subfile, so that `break /srcdir/list0.c:1' works as expected.
15834 start_subfile will ensure that this happens provided that we pass the
15835 concatenation of files.files[1].dir and files.files[1].name as the
15839 dwarf2_start_subfile (const char *filename, const char *dirname,
15840 const char *comp_dir)
15844 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
15845 `start_symtab' will always pass the contents of DW_AT_comp_dir as
15846 second argument to start_subfile. To be consistent, we do the
15847 same here. In order not to lose the line information directory,
15848 we concatenate it to the filename when it makes sense.
15849 Note that the Dwarf3 standard says (speaking of filenames in line
15850 information): ``The directory index is ignored for file names
15851 that represent full path names''. Thus ignoring dirname in the
15852 `else' branch below isn't an issue. */
15854 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
15856 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
15860 start_subfile (filename, comp_dir);
15866 /* Start a symtab for DWARF.
15867 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
15870 dwarf2_start_symtab (struct dwarf2_cu *cu,
15871 const char *name, const char *comp_dir, CORE_ADDR low_pc)
15873 start_symtab (name, comp_dir, low_pc);
15874 record_debugformat ("DWARF 2");
15875 record_producer (cu->producer);
15877 /* We assume that we're processing GCC output. */
15878 processing_gcc_compilation = 2;
15880 cu->processing_has_namespace_info = 0;
15884 var_decode_location (struct attribute *attr, struct symbol *sym,
15885 struct dwarf2_cu *cu)
15887 struct objfile *objfile = cu->objfile;
15888 struct comp_unit_head *cu_header = &cu->header;
15890 /* NOTE drow/2003-01-30: There used to be a comment and some special
15891 code here to turn a symbol with DW_AT_external and a
15892 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
15893 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
15894 with some versions of binutils) where shared libraries could have
15895 relocations against symbols in their debug information - the
15896 minimal symbol would have the right address, but the debug info
15897 would not. It's no longer necessary, because we will explicitly
15898 apply relocations when we read in the debug information now. */
15900 /* A DW_AT_location attribute with no contents indicates that a
15901 variable has been optimized away. */
15902 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
15904 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
15908 /* Handle one degenerate form of location expression specially, to
15909 preserve GDB's previous behavior when section offsets are
15910 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
15911 then mark this symbol as LOC_STATIC. */
15913 if (attr_form_is_block (attr)
15914 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
15915 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
15916 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
15917 && (DW_BLOCK (attr)->size
15918 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
15920 unsigned int dummy;
15922 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
15923 SYMBOL_VALUE_ADDRESS (sym) =
15924 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
15926 SYMBOL_VALUE_ADDRESS (sym) =
15927 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
15928 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
15929 fixup_symbol_section (sym, objfile);
15930 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
15931 SYMBOL_SECTION (sym));
15935 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
15936 expression evaluator, and use LOC_COMPUTED only when necessary
15937 (i.e. when the value of a register or memory location is
15938 referenced, or a thread-local block, etc.). Then again, it might
15939 not be worthwhile. I'm assuming that it isn't unless performance
15940 or memory numbers show me otherwise. */
15942 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
15944 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
15945 cu->has_loclist = 1;
15948 /* Given a pointer to a DWARF information entry, figure out if we need
15949 to make a symbol table entry for it, and if so, create a new entry
15950 and return a pointer to it.
15951 If TYPE is NULL, determine symbol type from the die, otherwise
15952 used the passed type.
15953 If SPACE is not NULL, use it to hold the new symbol. If it is
15954 NULL, allocate a new symbol on the objfile's obstack. */
15956 static struct symbol *
15957 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
15958 struct symbol *space)
15960 struct objfile *objfile = cu->objfile;
15961 struct symbol *sym = NULL;
15963 struct attribute *attr = NULL;
15964 struct attribute *attr2 = NULL;
15965 CORE_ADDR baseaddr;
15966 struct pending **list_to_add = NULL;
15968 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
15970 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15972 name = dwarf2_name (die, cu);
15975 const char *linkagename;
15976 int suppress_add = 0;
15981 sym = allocate_symbol (objfile);
15982 OBJSTAT (objfile, n_syms++);
15984 /* Cache this symbol's name and the name's demangled form (if any). */
15985 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
15986 linkagename = dwarf2_physname (name, die, cu);
15987 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
15989 /* Fortran does not have mangling standard and the mangling does differ
15990 between gfortran, iFort etc. */
15991 if (cu->language == language_fortran
15992 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
15993 symbol_set_demangled_name (&(sym->ginfo),
15994 dwarf2_full_name (name, die, cu),
15997 /* Default assumptions.
15998 Use the passed type or decode it from the die. */
15999 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16000 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16002 SYMBOL_TYPE (sym) = type;
16004 SYMBOL_TYPE (sym) = die_type (die, cu);
16005 attr = dwarf2_attr (die,
16006 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16010 SYMBOL_LINE (sym) = DW_UNSND (attr);
16013 attr = dwarf2_attr (die,
16014 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16018 int file_index = DW_UNSND (attr);
16020 if (cu->line_header == NULL
16021 || file_index > cu->line_header->num_file_names)
16022 complaint (&symfile_complaints,
16023 _("file index out of range"));
16024 else if (file_index > 0)
16026 struct file_entry *fe;
16028 fe = &cu->line_header->file_names[file_index - 1];
16029 SYMBOL_SYMTAB (sym) = fe->symtab;
16036 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16039 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16041 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16042 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16043 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16044 add_symbol_to_list (sym, cu->list_in_scope);
16046 case DW_TAG_subprogram:
16047 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16049 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16050 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16051 if ((attr2 && (DW_UNSND (attr2) != 0))
16052 || cu->language == language_ada)
16054 /* Subprograms marked external are stored as a global symbol.
16055 Ada subprograms, whether marked external or not, are always
16056 stored as a global symbol, because we want to be able to
16057 access them globally. For instance, we want to be able
16058 to break on a nested subprogram without having to
16059 specify the context. */
16060 list_to_add = &global_symbols;
16064 list_to_add = cu->list_in_scope;
16067 case DW_TAG_inlined_subroutine:
16068 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16070 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16071 SYMBOL_INLINED (sym) = 1;
16072 list_to_add = cu->list_in_scope;
16074 case DW_TAG_template_value_param:
16076 /* Fall through. */
16077 case DW_TAG_constant:
16078 case DW_TAG_variable:
16079 case DW_TAG_member:
16080 /* Compilation with minimal debug info may result in
16081 variables with missing type entries. Change the
16082 misleading `void' type to something sensible. */
16083 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16085 = objfile_type (objfile)->nodebug_data_symbol;
16087 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16088 /* In the case of DW_TAG_member, we should only be called for
16089 static const members. */
16090 if (die->tag == DW_TAG_member)
16092 /* dwarf2_add_field uses die_is_declaration,
16093 so we do the same. */
16094 gdb_assert (die_is_declaration (die, cu));
16099 dwarf2_const_value (attr, sym, cu);
16100 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16103 if (attr2 && (DW_UNSND (attr2) != 0))
16104 list_to_add = &global_symbols;
16106 list_to_add = cu->list_in_scope;
16110 attr = dwarf2_attr (die, DW_AT_location, cu);
16113 var_decode_location (attr, sym, cu);
16114 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16116 /* Fortran explicitly imports any global symbols to the local
16117 scope by DW_TAG_common_block. */
16118 if (cu->language == language_fortran && die->parent
16119 && die->parent->tag == DW_TAG_common_block)
16122 if (SYMBOL_CLASS (sym) == LOC_STATIC
16123 && SYMBOL_VALUE_ADDRESS (sym) == 0
16124 && !dwarf2_per_objfile->has_section_at_zero)
16126 /* When a static variable is eliminated by the linker,
16127 the corresponding debug information is not stripped
16128 out, but the variable address is set to null;
16129 do not add such variables into symbol table. */
16131 else if (attr2 && (DW_UNSND (attr2) != 0))
16133 /* Workaround gfortran PR debug/40040 - it uses
16134 DW_AT_location for variables in -fPIC libraries which may
16135 get overriden by other libraries/executable and get
16136 a different address. Resolve it by the minimal symbol
16137 which may come from inferior's executable using copy
16138 relocation. Make this workaround only for gfortran as for
16139 other compilers GDB cannot guess the minimal symbol
16140 Fortran mangling kind. */
16141 if (cu->language == language_fortran && die->parent
16142 && die->parent->tag == DW_TAG_module
16144 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16145 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16147 /* A variable with DW_AT_external is never static,
16148 but it may be block-scoped. */
16149 list_to_add = (cu->list_in_scope == &file_symbols
16150 ? &global_symbols : cu->list_in_scope);
16153 list_to_add = cu->list_in_scope;
16157 /* We do not know the address of this symbol.
16158 If it is an external symbol and we have type information
16159 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16160 The address of the variable will then be determined from
16161 the minimal symbol table whenever the variable is
16163 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16165 /* Fortran explicitly imports any global symbols to the local
16166 scope by DW_TAG_common_block. */
16167 if (cu->language == language_fortran && die->parent
16168 && die->parent->tag == DW_TAG_common_block)
16170 /* SYMBOL_CLASS doesn't matter here because
16171 read_common_block is going to reset it. */
16173 list_to_add = cu->list_in_scope;
16175 else if (attr2 && (DW_UNSND (attr2) != 0)
16176 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16178 /* A variable with DW_AT_external is never static, but it
16179 may be block-scoped. */
16180 list_to_add = (cu->list_in_scope == &file_symbols
16181 ? &global_symbols : cu->list_in_scope);
16183 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16185 else if (!die_is_declaration (die, cu))
16187 /* Use the default LOC_OPTIMIZED_OUT class. */
16188 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16190 list_to_add = cu->list_in_scope;
16194 case DW_TAG_formal_parameter:
16195 /* If we are inside a function, mark this as an argument. If
16196 not, we might be looking at an argument to an inlined function
16197 when we do not have enough information to show inlined frames;
16198 pretend it's a local variable in that case so that the user can
16200 if (context_stack_depth > 0
16201 && context_stack[context_stack_depth - 1].name != NULL)
16202 SYMBOL_IS_ARGUMENT (sym) = 1;
16203 attr = dwarf2_attr (die, DW_AT_location, cu);
16206 var_decode_location (attr, sym, cu);
16208 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16211 dwarf2_const_value (attr, sym, cu);
16214 list_to_add = cu->list_in_scope;
16216 case DW_TAG_unspecified_parameters:
16217 /* From varargs functions; gdb doesn't seem to have any
16218 interest in this information, so just ignore it for now.
16221 case DW_TAG_template_type_param:
16223 /* Fall through. */
16224 case DW_TAG_class_type:
16225 case DW_TAG_interface_type:
16226 case DW_TAG_structure_type:
16227 case DW_TAG_union_type:
16228 case DW_TAG_set_type:
16229 case DW_TAG_enumeration_type:
16230 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16231 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16234 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16235 really ever be static objects: otherwise, if you try
16236 to, say, break of a class's method and you're in a file
16237 which doesn't mention that class, it won't work unless
16238 the check for all static symbols in lookup_symbol_aux
16239 saves you. See the OtherFileClass tests in
16240 gdb.c++/namespace.exp. */
16244 list_to_add = (cu->list_in_scope == &file_symbols
16245 && (cu->language == language_cplus
16246 || cu->language == language_java)
16247 ? &global_symbols : cu->list_in_scope);
16249 /* The semantics of C++ state that "struct foo {
16250 ... }" also defines a typedef for "foo". A Java
16251 class declaration also defines a typedef for the
16253 if (cu->language == language_cplus
16254 || cu->language == language_java
16255 || cu->language == language_ada)
16257 /* The symbol's name is already allocated along
16258 with this objfile, so we don't need to
16259 duplicate it for the type. */
16260 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16261 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16266 case DW_TAG_typedef:
16267 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16268 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16269 list_to_add = cu->list_in_scope;
16271 case DW_TAG_base_type:
16272 case DW_TAG_subrange_type:
16273 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16274 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16275 list_to_add = cu->list_in_scope;
16277 case DW_TAG_enumerator:
16278 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16281 dwarf2_const_value (attr, sym, cu);
16284 /* NOTE: carlton/2003-11-10: See comment above in the
16285 DW_TAG_class_type, etc. block. */
16287 list_to_add = (cu->list_in_scope == &file_symbols
16288 && (cu->language == language_cplus
16289 || cu->language == language_java)
16290 ? &global_symbols : cu->list_in_scope);
16293 case DW_TAG_namespace:
16294 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16295 list_to_add = &global_symbols;
16297 case DW_TAG_common_block:
16298 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16299 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16300 add_symbol_to_list (sym, cu->list_in_scope);
16303 /* Not a tag we recognize. Hopefully we aren't processing
16304 trash data, but since we must specifically ignore things
16305 we don't recognize, there is nothing else we should do at
16307 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16308 dwarf_tag_name (die->tag));
16314 sym->hash_next = objfile->template_symbols;
16315 objfile->template_symbols = sym;
16316 list_to_add = NULL;
16319 if (list_to_add != NULL)
16320 add_symbol_to_list (sym, list_to_add);
16322 /* For the benefit of old versions of GCC, check for anonymous
16323 namespaces based on the demangled name. */
16324 if (!cu->processing_has_namespace_info
16325 && cu->language == language_cplus)
16326 cp_scan_for_anonymous_namespaces (sym, objfile);
16331 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16333 static struct symbol *
16334 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16336 return new_symbol_full (die, type, cu, NULL);
16339 /* Given an attr with a DW_FORM_dataN value in host byte order,
16340 zero-extend it as appropriate for the symbol's type. The DWARF
16341 standard (v4) is not entirely clear about the meaning of using
16342 DW_FORM_dataN for a constant with a signed type, where the type is
16343 wider than the data. The conclusion of a discussion on the DWARF
16344 list was that this is unspecified. We choose to always zero-extend
16345 because that is the interpretation long in use by GCC. */
16348 dwarf2_const_value_data (struct attribute *attr, struct type *type,
16349 const char *name, struct obstack *obstack,
16350 struct dwarf2_cu *cu, LONGEST *value, int bits)
16352 struct objfile *objfile = cu->objfile;
16353 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16354 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16355 LONGEST l = DW_UNSND (attr);
16357 if (bits < sizeof (*value) * 8)
16359 l &= ((LONGEST) 1 << bits) - 1;
16362 else if (bits == sizeof (*value) * 8)
16366 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16367 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16374 /* Read a constant value from an attribute. Either set *VALUE, or if
16375 the value does not fit in *VALUE, set *BYTES - either already
16376 allocated on the objfile obstack, or newly allocated on OBSTACK,
16377 or, set *BATON, if we translated the constant to a location
16381 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16382 const char *name, struct obstack *obstack,
16383 struct dwarf2_cu *cu,
16384 LONGEST *value, const gdb_byte **bytes,
16385 struct dwarf2_locexpr_baton **baton)
16387 struct objfile *objfile = cu->objfile;
16388 struct comp_unit_head *cu_header = &cu->header;
16389 struct dwarf_block *blk;
16390 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16391 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16397 switch (attr->form)
16400 case DW_FORM_GNU_addr_index:
16404 if (TYPE_LENGTH (type) != cu_header->addr_size)
16405 dwarf2_const_value_length_mismatch_complaint (name,
16406 cu_header->addr_size,
16407 TYPE_LENGTH (type));
16408 /* Symbols of this form are reasonably rare, so we just
16409 piggyback on the existing location code rather than writing
16410 a new implementation of symbol_computed_ops. */
16411 *baton = obstack_alloc (&objfile->objfile_obstack,
16412 sizeof (struct dwarf2_locexpr_baton));
16413 (*baton)->per_cu = cu->per_cu;
16414 gdb_assert ((*baton)->per_cu);
16416 (*baton)->size = 2 + cu_header->addr_size;
16417 data = obstack_alloc (&objfile->objfile_obstack, (*baton)->size);
16418 (*baton)->data = data;
16420 data[0] = DW_OP_addr;
16421 store_unsigned_integer (&data[1], cu_header->addr_size,
16422 byte_order, DW_ADDR (attr));
16423 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16426 case DW_FORM_string:
16428 case DW_FORM_GNU_str_index:
16429 case DW_FORM_GNU_strp_alt:
16430 /* DW_STRING is already allocated on the objfile obstack, point
16432 *bytes = (const gdb_byte *) DW_STRING (attr);
16434 case DW_FORM_block1:
16435 case DW_FORM_block2:
16436 case DW_FORM_block4:
16437 case DW_FORM_block:
16438 case DW_FORM_exprloc:
16439 blk = DW_BLOCK (attr);
16440 if (TYPE_LENGTH (type) != blk->size)
16441 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16442 TYPE_LENGTH (type));
16443 *bytes = blk->data;
16446 /* The DW_AT_const_value attributes are supposed to carry the
16447 symbol's value "represented as it would be on the target
16448 architecture." By the time we get here, it's already been
16449 converted to host endianness, so we just need to sign- or
16450 zero-extend it as appropriate. */
16451 case DW_FORM_data1:
16452 *bytes = dwarf2_const_value_data (attr, type, name,
16453 obstack, cu, value, 8);
16455 case DW_FORM_data2:
16456 *bytes = dwarf2_const_value_data (attr, type, name,
16457 obstack, cu, value, 16);
16459 case DW_FORM_data4:
16460 *bytes = dwarf2_const_value_data (attr, type, name,
16461 obstack, cu, value, 32);
16463 case DW_FORM_data8:
16464 *bytes = dwarf2_const_value_data (attr, type, name,
16465 obstack, cu, value, 64);
16468 case DW_FORM_sdata:
16469 *value = DW_SND (attr);
16472 case DW_FORM_udata:
16473 *value = DW_UNSND (attr);
16477 complaint (&symfile_complaints,
16478 _("unsupported const value attribute form: '%s'"),
16479 dwarf_form_name (attr->form));
16486 /* Copy constant value from an attribute to a symbol. */
16489 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16490 struct dwarf2_cu *cu)
16492 struct objfile *objfile = cu->objfile;
16493 struct comp_unit_head *cu_header = &cu->header;
16495 const gdb_byte *bytes;
16496 struct dwarf2_locexpr_baton *baton;
16498 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16499 SYMBOL_PRINT_NAME (sym),
16500 &objfile->objfile_obstack, cu,
16501 &value, &bytes, &baton);
16505 SYMBOL_LOCATION_BATON (sym) = baton;
16506 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16508 else if (bytes != NULL)
16510 SYMBOL_VALUE_BYTES (sym) = bytes;
16511 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16515 SYMBOL_VALUE (sym) = value;
16516 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16520 /* Return the type of the die in question using its DW_AT_type attribute. */
16522 static struct type *
16523 die_type (struct die_info *die, struct dwarf2_cu *cu)
16525 struct attribute *type_attr;
16527 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16530 /* A missing DW_AT_type represents a void type. */
16531 return objfile_type (cu->objfile)->builtin_void;
16534 return lookup_die_type (die, type_attr, cu);
16537 /* True iff CU's producer generates GNAT Ada auxiliary information
16538 that allows to find parallel types through that information instead
16539 of having to do expensive parallel lookups by type name. */
16542 need_gnat_info (struct dwarf2_cu *cu)
16544 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16545 of GNAT produces this auxiliary information, without any indication
16546 that it is produced. Part of enhancing the FSF version of GNAT
16547 to produce that information will be to put in place an indicator
16548 that we can use in order to determine whether the descriptive type
16549 info is available or not. One suggestion that has been made is
16550 to use a new attribute, attached to the CU die. For now, assume
16551 that the descriptive type info is not available. */
16555 /* Return the auxiliary type of the die in question using its
16556 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16557 attribute is not present. */
16559 static struct type *
16560 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16562 struct attribute *type_attr;
16564 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
16568 return lookup_die_type (die, type_attr, cu);
16571 /* If DIE has a descriptive_type attribute, then set the TYPE's
16572 descriptive type accordingly. */
16575 set_descriptive_type (struct type *type, struct die_info *die,
16576 struct dwarf2_cu *cu)
16578 struct type *descriptive_type = die_descriptive_type (die, cu);
16580 if (descriptive_type)
16582 ALLOCATE_GNAT_AUX_TYPE (type);
16583 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
16587 /* Return the containing type of the die in question using its
16588 DW_AT_containing_type attribute. */
16590 static struct type *
16591 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
16593 struct attribute *type_attr;
16595 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
16597 error (_("Dwarf Error: Problem turning containing type into gdb type "
16598 "[in module %s]"), cu->objfile->name);
16600 return lookup_die_type (die, type_attr, cu);
16603 /* Return an error marker type to use for the ill formed type in DIE/CU. */
16605 static struct type *
16606 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
16608 struct objfile *objfile = dwarf2_per_objfile->objfile;
16609 char *message, *saved;
16611 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
16613 cu->header.offset.sect_off,
16614 die->offset.sect_off);
16615 saved = obstack_copy0 (&objfile->objfile_obstack,
16616 message, strlen (message));
16619 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
16622 /* Look up the type of DIE in CU using its type attribute ATTR.
16623 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
16624 DW_AT_containing_type.
16625 If there is no type substitute an error marker. */
16627 static struct type *
16628 lookup_die_type (struct die_info *die, struct attribute *attr,
16629 struct dwarf2_cu *cu)
16631 struct objfile *objfile = cu->objfile;
16632 struct type *this_type;
16634 gdb_assert (attr->name == DW_AT_type
16635 || attr->name == DW_AT_GNAT_descriptive_type
16636 || attr->name == DW_AT_containing_type);
16638 /* First see if we have it cached. */
16640 if (attr->form == DW_FORM_GNU_ref_alt)
16642 struct dwarf2_per_cu_data *per_cu;
16643 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16645 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
16646 this_type = get_die_type_at_offset (offset, per_cu);
16648 else if (is_ref_attr (attr))
16650 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16652 this_type = get_die_type_at_offset (offset, cu->per_cu);
16654 else if (attr->form == DW_FORM_ref_sig8)
16656 ULONGEST signature = DW_SIGNATURE (attr);
16658 return get_signatured_type (die, signature, cu);
16662 complaint (&symfile_complaints,
16663 _("Dwarf Error: Bad type attribute %s in DIE"
16664 " at 0x%x [in module %s]"),
16665 dwarf_attr_name (attr->name), die->offset.sect_off,
16667 return build_error_marker_type (cu, die);
16670 /* If not cached we need to read it in. */
16672 if (this_type == NULL)
16674 struct die_info *type_die = NULL;
16675 struct dwarf2_cu *type_cu = cu;
16677 if (is_ref_attr (attr))
16678 type_die = follow_die_ref (die, attr, &type_cu);
16679 if (type_die == NULL)
16680 return build_error_marker_type (cu, die);
16681 /* If we find the type now, it's probably because the type came
16682 from an inter-CU reference and the type's CU got expanded before
16684 this_type = read_type_die (type_die, type_cu);
16687 /* If we still don't have a type use an error marker. */
16689 if (this_type == NULL)
16690 return build_error_marker_type (cu, die);
16695 /* Return the type in DIE, CU.
16696 Returns NULL for invalid types.
16698 This first does a lookup in die_type_hash,
16699 and only reads the die in if necessary.
16701 NOTE: This can be called when reading in partial or full symbols. */
16703 static struct type *
16704 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
16706 struct type *this_type;
16708 this_type = get_die_type (die, cu);
16712 return read_type_die_1 (die, cu);
16715 /* Read the type in DIE, CU.
16716 Returns NULL for invalid types. */
16718 static struct type *
16719 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
16721 struct type *this_type = NULL;
16725 case DW_TAG_class_type:
16726 case DW_TAG_interface_type:
16727 case DW_TAG_structure_type:
16728 case DW_TAG_union_type:
16729 this_type = read_structure_type (die, cu);
16731 case DW_TAG_enumeration_type:
16732 this_type = read_enumeration_type (die, cu);
16734 case DW_TAG_subprogram:
16735 case DW_TAG_subroutine_type:
16736 case DW_TAG_inlined_subroutine:
16737 this_type = read_subroutine_type (die, cu);
16739 case DW_TAG_array_type:
16740 this_type = read_array_type (die, cu);
16742 case DW_TAG_set_type:
16743 this_type = read_set_type (die, cu);
16745 case DW_TAG_pointer_type:
16746 this_type = read_tag_pointer_type (die, cu);
16748 case DW_TAG_ptr_to_member_type:
16749 this_type = read_tag_ptr_to_member_type (die, cu);
16751 case DW_TAG_reference_type:
16752 this_type = read_tag_reference_type (die, cu);
16754 case DW_TAG_const_type:
16755 this_type = read_tag_const_type (die, cu);
16757 case DW_TAG_volatile_type:
16758 this_type = read_tag_volatile_type (die, cu);
16760 case DW_TAG_restrict_type:
16761 this_type = read_tag_restrict_type (die, cu);
16763 case DW_TAG_string_type:
16764 this_type = read_tag_string_type (die, cu);
16766 case DW_TAG_typedef:
16767 this_type = read_typedef (die, cu);
16769 case DW_TAG_subrange_type:
16770 this_type = read_subrange_type (die, cu);
16772 case DW_TAG_base_type:
16773 this_type = read_base_type (die, cu);
16775 case DW_TAG_unspecified_type:
16776 this_type = read_unspecified_type (die, cu);
16778 case DW_TAG_namespace:
16779 this_type = read_namespace_type (die, cu);
16781 case DW_TAG_module:
16782 this_type = read_module_type (die, cu);
16785 complaint (&symfile_complaints,
16786 _("unexpected tag in read_type_die: '%s'"),
16787 dwarf_tag_name (die->tag));
16794 /* See if we can figure out if the class lives in a namespace. We do
16795 this by looking for a member function; its demangled name will
16796 contain namespace info, if there is any.
16797 Return the computed name or NULL.
16798 Space for the result is allocated on the objfile's obstack.
16799 This is the full-die version of guess_partial_die_structure_name.
16800 In this case we know DIE has no useful parent. */
16803 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
16805 struct die_info *spec_die;
16806 struct dwarf2_cu *spec_cu;
16807 struct die_info *child;
16810 spec_die = die_specification (die, &spec_cu);
16811 if (spec_die != NULL)
16817 for (child = die->child;
16819 child = child->sibling)
16821 if (child->tag == DW_TAG_subprogram)
16823 struct attribute *attr;
16825 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
16827 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
16831 = language_class_name_from_physname (cu->language_defn,
16835 if (actual_name != NULL)
16837 const char *die_name = dwarf2_name (die, cu);
16839 if (die_name != NULL
16840 && strcmp (die_name, actual_name) != 0)
16842 /* Strip off the class name from the full name.
16843 We want the prefix. */
16844 int die_name_len = strlen (die_name);
16845 int actual_name_len = strlen (actual_name);
16847 /* Test for '::' as a sanity check. */
16848 if (actual_name_len > die_name_len + 2
16849 && actual_name[actual_name_len
16850 - die_name_len - 1] == ':')
16852 obstack_copy0 (&cu->objfile->objfile_obstack,
16854 actual_name_len - die_name_len - 2);
16857 xfree (actual_name);
16866 /* GCC might emit a nameless typedef that has a linkage name. Determine the
16867 prefix part in such case. See
16868 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16871 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
16873 struct attribute *attr;
16876 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
16877 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
16880 attr = dwarf2_attr (die, DW_AT_name, cu);
16881 if (attr != NULL && DW_STRING (attr) != NULL)
16884 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
16886 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
16887 if (attr == NULL || DW_STRING (attr) == NULL)
16890 /* dwarf2_name had to be already called. */
16891 gdb_assert (DW_STRING_IS_CANONICAL (attr));
16893 /* Strip the base name, keep any leading namespaces/classes. */
16894 base = strrchr (DW_STRING (attr), ':');
16895 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
16898 return obstack_copy0 (&cu->objfile->objfile_obstack,
16899 DW_STRING (attr), &base[-1] - DW_STRING (attr));
16902 /* Return the name of the namespace/class that DIE is defined within,
16903 or "" if we can't tell. The caller should not xfree the result.
16905 For example, if we're within the method foo() in the following
16915 then determine_prefix on foo's die will return "N::C". */
16917 static const char *
16918 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
16920 struct die_info *parent, *spec_die;
16921 struct dwarf2_cu *spec_cu;
16922 struct type *parent_type;
16925 if (cu->language != language_cplus && cu->language != language_java
16926 && cu->language != language_fortran)
16929 retval = anonymous_struct_prefix (die, cu);
16933 /* We have to be careful in the presence of DW_AT_specification.
16934 For example, with GCC 3.4, given the code
16938 // Definition of N::foo.
16942 then we'll have a tree of DIEs like this:
16944 1: DW_TAG_compile_unit
16945 2: DW_TAG_namespace // N
16946 3: DW_TAG_subprogram // declaration of N::foo
16947 4: DW_TAG_subprogram // definition of N::foo
16948 DW_AT_specification // refers to die #3
16950 Thus, when processing die #4, we have to pretend that we're in
16951 the context of its DW_AT_specification, namely the contex of die
16954 spec_die = die_specification (die, &spec_cu);
16955 if (spec_die == NULL)
16956 parent = die->parent;
16959 parent = spec_die->parent;
16963 if (parent == NULL)
16965 else if (parent->building_fullname)
16968 const char *parent_name;
16970 /* It has been seen on RealView 2.2 built binaries,
16971 DW_TAG_template_type_param types actually _defined_ as
16972 children of the parent class:
16975 template class <class Enum> Class{};
16976 Class<enum E> class_e;
16978 1: DW_TAG_class_type (Class)
16979 2: DW_TAG_enumeration_type (E)
16980 3: DW_TAG_enumerator (enum1:0)
16981 3: DW_TAG_enumerator (enum2:1)
16983 2: DW_TAG_template_type_param
16984 DW_AT_type DW_FORM_ref_udata (E)
16986 Besides being broken debug info, it can put GDB into an
16987 infinite loop. Consider:
16989 When we're building the full name for Class<E>, we'll start
16990 at Class, and go look over its template type parameters,
16991 finding E. We'll then try to build the full name of E, and
16992 reach here. We're now trying to build the full name of E,
16993 and look over the parent DIE for containing scope. In the
16994 broken case, if we followed the parent DIE of E, we'd again
16995 find Class, and once again go look at its template type
16996 arguments, etc., etc. Simply don't consider such parent die
16997 as source-level parent of this die (it can't be, the language
16998 doesn't allow it), and break the loop here. */
16999 name = dwarf2_name (die, cu);
17000 parent_name = dwarf2_name (parent, cu);
17001 complaint (&symfile_complaints,
17002 _("template param type '%s' defined within parent '%s'"),
17003 name ? name : "<unknown>",
17004 parent_name ? parent_name : "<unknown>");
17008 switch (parent->tag)
17010 case DW_TAG_namespace:
17011 parent_type = read_type_die (parent, cu);
17012 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17013 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17014 Work around this problem here. */
17015 if (cu->language == language_cplus
17016 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17018 /* We give a name to even anonymous namespaces. */
17019 return TYPE_TAG_NAME (parent_type);
17020 case DW_TAG_class_type:
17021 case DW_TAG_interface_type:
17022 case DW_TAG_structure_type:
17023 case DW_TAG_union_type:
17024 case DW_TAG_module:
17025 parent_type = read_type_die (parent, cu);
17026 if (TYPE_TAG_NAME (parent_type) != NULL)
17027 return TYPE_TAG_NAME (parent_type);
17029 /* An anonymous structure is only allowed non-static data
17030 members; no typedefs, no member functions, et cetera.
17031 So it does not need a prefix. */
17033 case DW_TAG_compile_unit:
17034 case DW_TAG_partial_unit:
17035 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17036 if (cu->language == language_cplus
17037 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17038 && die->child != NULL
17039 && (die->tag == DW_TAG_class_type
17040 || die->tag == DW_TAG_structure_type
17041 || die->tag == DW_TAG_union_type))
17043 char *name = guess_full_die_structure_name (die, cu);
17049 return determine_prefix (parent, cu);
17053 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17054 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17055 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17056 an obconcat, otherwise allocate storage for the result. The CU argument is
17057 used to determine the language and hence, the appropriate separator. */
17059 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17062 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17063 int physname, struct dwarf2_cu *cu)
17065 const char *lead = "";
17068 if (suffix == NULL || suffix[0] == '\0'
17069 || prefix == NULL || prefix[0] == '\0')
17071 else if (cu->language == language_java)
17073 else if (cu->language == language_fortran && physname)
17075 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17076 DW_AT_MIPS_linkage_name is preferred and used instead. */
17084 if (prefix == NULL)
17086 if (suffix == NULL)
17092 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17094 strcpy (retval, lead);
17095 strcat (retval, prefix);
17096 strcat (retval, sep);
17097 strcat (retval, suffix);
17102 /* We have an obstack. */
17103 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17107 /* Return sibling of die, NULL if no sibling. */
17109 static struct die_info *
17110 sibling_die (struct die_info *die)
17112 return die->sibling;
17115 /* Get name of a die, return NULL if not found. */
17117 static const char *
17118 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17119 struct obstack *obstack)
17121 if (name && cu->language == language_cplus)
17123 char *canon_name = cp_canonicalize_string (name);
17125 if (canon_name != NULL)
17127 if (strcmp (canon_name, name) != 0)
17128 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17129 xfree (canon_name);
17136 /* Get name of a die, return NULL if not found. */
17138 static const char *
17139 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17141 struct attribute *attr;
17143 attr = dwarf2_attr (die, DW_AT_name, cu);
17144 if ((!attr || !DW_STRING (attr))
17145 && die->tag != DW_TAG_class_type
17146 && die->tag != DW_TAG_interface_type
17147 && die->tag != DW_TAG_structure_type
17148 && die->tag != DW_TAG_union_type)
17153 case DW_TAG_compile_unit:
17154 case DW_TAG_partial_unit:
17155 /* Compilation units have a DW_AT_name that is a filename, not
17156 a source language identifier. */
17157 case DW_TAG_enumeration_type:
17158 case DW_TAG_enumerator:
17159 /* These tags always have simple identifiers already; no need
17160 to canonicalize them. */
17161 return DW_STRING (attr);
17163 case DW_TAG_subprogram:
17164 /* Java constructors will all be named "<init>", so return
17165 the class name when we see this special case. */
17166 if (cu->language == language_java
17167 && DW_STRING (attr) != NULL
17168 && strcmp (DW_STRING (attr), "<init>") == 0)
17170 struct dwarf2_cu *spec_cu = cu;
17171 struct die_info *spec_die;
17173 /* GCJ will output '<init>' for Java constructor names.
17174 For this special case, return the name of the parent class. */
17176 /* GCJ may output suprogram DIEs with AT_specification set.
17177 If so, use the name of the specified DIE. */
17178 spec_die = die_specification (die, &spec_cu);
17179 if (spec_die != NULL)
17180 return dwarf2_name (spec_die, spec_cu);
17185 if (die->tag == DW_TAG_class_type)
17186 return dwarf2_name (die, cu);
17188 while (die->tag != DW_TAG_compile_unit
17189 && die->tag != DW_TAG_partial_unit);
17193 case DW_TAG_class_type:
17194 case DW_TAG_interface_type:
17195 case DW_TAG_structure_type:
17196 case DW_TAG_union_type:
17197 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17198 structures or unions. These were of the form "._%d" in GCC 4.1,
17199 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17200 and GCC 4.4. We work around this problem by ignoring these. */
17201 if (attr && DW_STRING (attr)
17202 && (strncmp (DW_STRING (attr), "._", 2) == 0
17203 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17206 /* GCC might emit a nameless typedef that has a linkage name. See
17207 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17208 if (!attr || DW_STRING (attr) == NULL)
17210 char *demangled = NULL;
17212 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17214 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17216 if (attr == NULL || DW_STRING (attr) == NULL)
17219 /* Avoid demangling DW_STRING (attr) the second time on a second
17220 call for the same DIE. */
17221 if (!DW_STRING_IS_CANONICAL (attr))
17222 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17228 /* FIXME: we already did this for the partial symbol... */
17229 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17230 demangled, strlen (demangled));
17231 DW_STRING_IS_CANONICAL (attr) = 1;
17234 /* Strip any leading namespaces/classes, keep only the base name.
17235 DW_AT_name for named DIEs does not contain the prefixes. */
17236 base = strrchr (DW_STRING (attr), ':');
17237 if (base && base > DW_STRING (attr) && base[-1] == ':')
17240 return DW_STRING (attr);
17249 if (!DW_STRING_IS_CANONICAL (attr))
17252 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17253 &cu->objfile->objfile_obstack);
17254 DW_STRING_IS_CANONICAL (attr) = 1;
17256 return DW_STRING (attr);
17259 /* Return the die that this die in an extension of, or NULL if there
17260 is none. *EXT_CU is the CU containing DIE on input, and the CU
17261 containing the return value on output. */
17263 static struct die_info *
17264 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17266 struct attribute *attr;
17268 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17272 return follow_die_ref (die, attr, ext_cu);
17275 /* Convert a DIE tag into its string name. */
17277 static const char *
17278 dwarf_tag_name (unsigned tag)
17280 const char *name = get_DW_TAG_name (tag);
17283 return "DW_TAG_<unknown>";
17288 /* Convert a DWARF attribute code into its string name. */
17290 static const char *
17291 dwarf_attr_name (unsigned attr)
17295 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17296 if (attr == DW_AT_MIPS_fde)
17297 return "DW_AT_MIPS_fde";
17299 if (attr == DW_AT_HP_block_index)
17300 return "DW_AT_HP_block_index";
17303 name = get_DW_AT_name (attr);
17306 return "DW_AT_<unknown>";
17311 /* Convert a DWARF value form code into its string name. */
17313 static const char *
17314 dwarf_form_name (unsigned form)
17316 const char *name = get_DW_FORM_name (form);
17319 return "DW_FORM_<unknown>";
17325 dwarf_bool_name (unsigned mybool)
17333 /* Convert a DWARF type code into its string name. */
17335 static const char *
17336 dwarf_type_encoding_name (unsigned enc)
17338 const char *name = get_DW_ATE_name (enc);
17341 return "DW_ATE_<unknown>";
17347 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17351 print_spaces (indent, f);
17352 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17353 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17355 if (die->parent != NULL)
17357 print_spaces (indent, f);
17358 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17359 die->parent->offset.sect_off);
17362 print_spaces (indent, f);
17363 fprintf_unfiltered (f, " has children: %s\n",
17364 dwarf_bool_name (die->child != NULL));
17366 print_spaces (indent, f);
17367 fprintf_unfiltered (f, " attributes:\n");
17369 for (i = 0; i < die->num_attrs; ++i)
17371 print_spaces (indent, f);
17372 fprintf_unfiltered (f, " %s (%s) ",
17373 dwarf_attr_name (die->attrs[i].name),
17374 dwarf_form_name (die->attrs[i].form));
17376 switch (die->attrs[i].form)
17379 case DW_FORM_GNU_addr_index:
17380 fprintf_unfiltered (f, "address: ");
17381 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17383 case DW_FORM_block2:
17384 case DW_FORM_block4:
17385 case DW_FORM_block:
17386 case DW_FORM_block1:
17387 fprintf_unfiltered (f, "block: size %s",
17388 pulongest (DW_BLOCK (&die->attrs[i])->size));
17390 case DW_FORM_exprloc:
17391 fprintf_unfiltered (f, "expression: size %s",
17392 pulongest (DW_BLOCK (&die->attrs[i])->size));
17394 case DW_FORM_ref_addr:
17395 fprintf_unfiltered (f, "ref address: ");
17396 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17398 case DW_FORM_GNU_ref_alt:
17399 fprintf_unfiltered (f, "alt ref address: ");
17400 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17406 case DW_FORM_ref_udata:
17407 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17408 (long) (DW_UNSND (&die->attrs[i])));
17410 case DW_FORM_data1:
17411 case DW_FORM_data2:
17412 case DW_FORM_data4:
17413 case DW_FORM_data8:
17414 case DW_FORM_udata:
17415 case DW_FORM_sdata:
17416 fprintf_unfiltered (f, "constant: %s",
17417 pulongest (DW_UNSND (&die->attrs[i])));
17419 case DW_FORM_sec_offset:
17420 fprintf_unfiltered (f, "section offset: %s",
17421 pulongest (DW_UNSND (&die->attrs[i])));
17423 case DW_FORM_ref_sig8:
17424 fprintf_unfiltered (f, "signature: %s",
17425 hex_string (DW_SIGNATURE (&die->attrs[i])));
17427 case DW_FORM_string:
17429 case DW_FORM_GNU_str_index:
17430 case DW_FORM_GNU_strp_alt:
17431 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17432 DW_STRING (&die->attrs[i])
17433 ? DW_STRING (&die->attrs[i]) : "",
17434 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17437 if (DW_UNSND (&die->attrs[i]))
17438 fprintf_unfiltered (f, "flag: TRUE");
17440 fprintf_unfiltered (f, "flag: FALSE");
17442 case DW_FORM_flag_present:
17443 fprintf_unfiltered (f, "flag: TRUE");
17445 case DW_FORM_indirect:
17446 /* The reader will have reduced the indirect form to
17447 the "base form" so this form should not occur. */
17448 fprintf_unfiltered (f,
17449 "unexpected attribute form: DW_FORM_indirect");
17452 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17453 die->attrs[i].form);
17456 fprintf_unfiltered (f, "\n");
17461 dump_die_for_error (struct die_info *die)
17463 dump_die_shallow (gdb_stderr, 0, die);
17467 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17469 int indent = level * 4;
17471 gdb_assert (die != NULL);
17473 if (level >= max_level)
17476 dump_die_shallow (f, indent, die);
17478 if (die->child != NULL)
17480 print_spaces (indent, f);
17481 fprintf_unfiltered (f, " Children:");
17482 if (level + 1 < max_level)
17484 fprintf_unfiltered (f, "\n");
17485 dump_die_1 (f, level + 1, max_level, die->child);
17489 fprintf_unfiltered (f,
17490 " [not printed, max nesting level reached]\n");
17494 if (die->sibling != NULL && level > 0)
17496 dump_die_1 (f, level, max_level, die->sibling);
17500 /* This is called from the pdie macro in gdbinit.in.
17501 It's not static so gcc will keep a copy callable from gdb. */
17504 dump_die (struct die_info *die, int max_level)
17506 dump_die_1 (gdb_stdlog, 0, max_level, die);
17510 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17514 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17520 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17521 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17524 is_ref_attr (struct attribute *attr)
17526 switch (attr->form)
17528 case DW_FORM_ref_addr:
17533 case DW_FORM_ref_udata:
17534 case DW_FORM_GNU_ref_alt:
17541 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17545 dwarf2_get_ref_die_offset (struct attribute *attr)
17547 sect_offset retval = { DW_UNSND (attr) };
17549 if (is_ref_attr (attr))
17552 retval.sect_off = 0;
17553 complaint (&symfile_complaints,
17554 _("unsupported die ref attribute form: '%s'"),
17555 dwarf_form_name (attr->form));
17559 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17560 * the value held by the attribute is not constant. */
17563 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17565 if (attr->form == DW_FORM_sdata)
17566 return DW_SND (attr);
17567 else if (attr->form == DW_FORM_udata
17568 || attr->form == DW_FORM_data1
17569 || attr->form == DW_FORM_data2
17570 || attr->form == DW_FORM_data4
17571 || attr->form == DW_FORM_data8)
17572 return DW_UNSND (attr);
17575 complaint (&symfile_complaints,
17576 _("Attribute value is not a constant (%s)"),
17577 dwarf_form_name (attr->form));
17578 return default_value;
17582 /* Follow reference or signature attribute ATTR of SRC_DIE.
17583 On entry *REF_CU is the CU of SRC_DIE.
17584 On exit *REF_CU is the CU of the result. */
17586 static struct die_info *
17587 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
17588 struct dwarf2_cu **ref_cu)
17590 struct die_info *die;
17592 if (is_ref_attr (attr))
17593 die = follow_die_ref (src_die, attr, ref_cu);
17594 else if (attr->form == DW_FORM_ref_sig8)
17595 die = follow_die_sig (src_die, attr, ref_cu);
17598 dump_die_for_error (src_die);
17599 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
17600 (*ref_cu)->objfile->name);
17606 /* Follow reference OFFSET.
17607 On entry *REF_CU is the CU of the source die referencing OFFSET.
17608 On exit *REF_CU is the CU of the result.
17609 Returns NULL if OFFSET is invalid. */
17611 static struct die_info *
17612 follow_die_offset (sect_offset offset, int offset_in_dwz,
17613 struct dwarf2_cu **ref_cu)
17615 struct die_info temp_die;
17616 struct dwarf2_cu *target_cu, *cu = *ref_cu;
17618 gdb_assert (cu->per_cu != NULL);
17622 if (cu->per_cu->is_debug_types)
17624 /* .debug_types CUs cannot reference anything outside their CU.
17625 If they need to, they have to reference a signatured type via
17626 DW_FORM_ref_sig8. */
17627 if (! offset_in_cu_p (&cu->header, offset))
17630 else if (offset_in_dwz != cu->per_cu->is_dwz
17631 || ! offset_in_cu_p (&cu->header, offset))
17633 struct dwarf2_per_cu_data *per_cu;
17635 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
17638 /* If necessary, add it to the queue and load its DIEs. */
17639 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
17640 load_full_comp_unit (per_cu, cu->language);
17642 target_cu = per_cu->cu;
17644 else if (cu->dies == NULL)
17646 /* We're loading full DIEs during partial symbol reading. */
17647 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
17648 load_full_comp_unit (cu->per_cu, language_minimal);
17651 *ref_cu = target_cu;
17652 temp_die.offset = offset;
17653 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
17656 /* Follow reference attribute ATTR of SRC_DIE.
17657 On entry *REF_CU is the CU of SRC_DIE.
17658 On exit *REF_CU is the CU of the result. */
17660 static struct die_info *
17661 follow_die_ref (struct die_info *src_die, struct attribute *attr,
17662 struct dwarf2_cu **ref_cu)
17664 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17665 struct dwarf2_cu *cu = *ref_cu;
17666 struct die_info *die;
17668 die = follow_die_offset (offset,
17669 (attr->form == DW_FORM_GNU_ref_alt
17670 || cu->per_cu->is_dwz),
17673 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
17674 "at 0x%x [in module %s]"),
17675 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
17680 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
17681 Returned value is intended for DW_OP_call*. Returned
17682 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
17684 struct dwarf2_locexpr_baton
17685 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
17686 struct dwarf2_per_cu_data *per_cu,
17687 CORE_ADDR (*get_frame_pc) (void *baton),
17690 struct dwarf2_cu *cu;
17691 struct die_info *die;
17692 struct attribute *attr;
17693 struct dwarf2_locexpr_baton retval;
17695 dw2_setup (per_cu->objfile);
17697 if (per_cu->cu == NULL)
17701 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
17703 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
17704 offset.sect_off, per_cu->objfile->name);
17706 attr = dwarf2_attr (die, DW_AT_location, cu);
17709 /* DWARF: "If there is no such attribute, then there is no effect.".
17710 DATA is ignored if SIZE is 0. */
17712 retval.data = NULL;
17715 else if (attr_form_is_section_offset (attr))
17717 struct dwarf2_loclist_baton loclist_baton;
17718 CORE_ADDR pc = (*get_frame_pc) (baton);
17721 fill_in_loclist_baton (cu, &loclist_baton, attr);
17723 retval.data = dwarf2_find_location_expression (&loclist_baton,
17725 retval.size = size;
17729 if (!attr_form_is_block (attr))
17730 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
17731 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
17732 offset.sect_off, per_cu->objfile->name);
17734 retval.data = DW_BLOCK (attr)->data;
17735 retval.size = DW_BLOCK (attr)->size;
17737 retval.per_cu = cu->per_cu;
17739 age_cached_comp_units ();
17744 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
17747 struct dwarf2_locexpr_baton
17748 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
17749 struct dwarf2_per_cu_data *per_cu,
17750 CORE_ADDR (*get_frame_pc) (void *baton),
17753 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
17755 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
17758 /* Return the type of the DIE at DIE_OFFSET in the CU named by
17762 dwarf2_get_die_type (cu_offset die_offset,
17763 struct dwarf2_per_cu_data *per_cu)
17765 sect_offset die_offset_sect;
17767 dw2_setup (per_cu->objfile);
17769 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
17770 return get_die_type_at_offset (die_offset_sect, per_cu);
17773 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
17774 On entry *REF_CU is the CU of SRC_DIE.
17775 On exit *REF_CU is the CU of the result.
17776 Returns NULL if the referenced DIE isn't found. */
17778 static struct die_info *
17779 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
17780 struct dwarf2_cu **ref_cu)
17782 struct objfile *objfile = (*ref_cu)->objfile;
17783 struct die_info temp_die;
17784 struct dwarf2_cu *sig_cu;
17785 struct die_info *die;
17787 /* While it might be nice to assert sig_type->type == NULL here,
17788 we can get here for DW_AT_imported_declaration where we need
17789 the DIE not the type. */
17791 /* If necessary, add it to the queue and load its DIEs. */
17793 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
17794 read_signatured_type (sig_type);
17796 gdb_assert (sig_type->per_cu.cu != NULL);
17798 sig_cu = sig_type->per_cu.cu;
17799 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
17800 temp_die.offset = sig_type->type_offset_in_section;
17801 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
17802 temp_die.offset.sect_off);
17805 /* For .gdb_index version 7 keep track of included TUs.
17806 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
17807 if (dwarf2_per_objfile->index_table != NULL
17808 && dwarf2_per_objfile->index_table->version <= 7)
17810 VEC_safe_push (dwarf2_per_cu_ptr,
17811 (*ref_cu)->per_cu->imported_symtabs,
17822 /* Follow signatured type referenced by ATTR in SRC_DIE.
17823 On entry *REF_CU is the CU of SRC_DIE.
17824 On exit *REF_CU is the CU of the result.
17825 The result is the DIE of the type.
17826 If the referenced type cannot be found an error is thrown. */
17828 static struct die_info *
17829 follow_die_sig (struct die_info *src_die, struct attribute *attr,
17830 struct dwarf2_cu **ref_cu)
17832 ULONGEST signature = DW_SIGNATURE (attr);
17833 struct signatured_type *sig_type;
17834 struct die_info *die;
17836 gdb_assert (attr->form == DW_FORM_ref_sig8);
17838 sig_type = lookup_signatured_type (signature);
17839 /* sig_type will be NULL if the signatured type is missing from
17841 if (sig_type == NULL)
17843 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
17844 " from DIE at 0x%x [in module %s]"),
17845 hex_string (signature), src_die->offset.sect_off,
17846 (*ref_cu)->objfile->name);
17849 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
17852 dump_die_for_error (src_die);
17853 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
17854 " from DIE at 0x%x [in module %s]"),
17855 hex_string (signature), src_die->offset.sect_off,
17856 (*ref_cu)->objfile->name);
17862 /* Get the type specified by SIGNATURE referenced in DIE/CU,
17863 reading in and processing the type unit if necessary. */
17865 static struct type *
17866 get_signatured_type (struct die_info *die, ULONGEST signature,
17867 struct dwarf2_cu *cu)
17869 struct signatured_type *sig_type;
17870 struct dwarf2_cu *type_cu;
17871 struct die_info *type_die;
17874 sig_type = lookup_signatured_type (signature);
17875 /* sig_type will be NULL if the signatured type is missing from
17877 if (sig_type == NULL)
17879 complaint (&symfile_complaints,
17880 _("Dwarf Error: Cannot find signatured DIE %s referenced"
17881 " from DIE at 0x%x [in module %s]"),
17882 hex_string (signature), die->offset.sect_off,
17883 dwarf2_per_objfile->objfile->name);
17884 return build_error_marker_type (cu, die);
17887 /* If we already know the type we're done. */
17888 if (sig_type->type != NULL)
17889 return sig_type->type;
17892 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
17893 if (type_die != NULL)
17895 /* N.B. We need to call get_die_type to ensure only one type for this DIE
17896 is created. This is important, for example, because for c++ classes
17897 we need TYPE_NAME set which is only done by new_symbol. Blech. */
17898 type = read_type_die (type_die, type_cu);
17901 complaint (&symfile_complaints,
17902 _("Dwarf Error: Cannot build signatured type %s"
17903 " referenced from DIE at 0x%x [in module %s]"),
17904 hex_string (signature), die->offset.sect_off,
17905 dwarf2_per_objfile->objfile->name);
17906 type = build_error_marker_type (cu, die);
17911 complaint (&symfile_complaints,
17912 _("Dwarf Error: Problem reading signatured DIE %s referenced"
17913 " from DIE at 0x%x [in module %s]"),
17914 hex_string (signature), die->offset.sect_off,
17915 dwarf2_per_objfile->objfile->name);
17916 type = build_error_marker_type (cu, die);
17918 sig_type->type = type;
17923 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
17924 reading in and processing the type unit if necessary. */
17926 static struct type *
17927 get_DW_AT_signature_type (struct die_info *die, struct attribute *attr,
17928 struct dwarf2_cu *cu)
17930 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
17931 if (is_ref_attr (attr))
17933 struct dwarf2_cu *type_cu = cu;
17934 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
17936 return read_type_die (type_die, type_cu);
17938 else if (attr->form == DW_FORM_ref_sig8)
17940 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
17944 complaint (&symfile_complaints,
17945 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
17946 " at 0x%x [in module %s]"),
17947 dwarf_form_name (attr->form), die->offset.sect_off,
17948 dwarf2_per_objfile->objfile->name);
17949 return build_error_marker_type (cu, die);
17953 /* Load the DIEs associated with type unit PER_CU into memory. */
17956 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
17958 struct signatured_type *sig_type;
17960 /* Caller is responsible for ensuring type_unit_groups don't get here. */
17961 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
17963 /* We have the per_cu, but we need the signatured_type.
17964 Fortunately this is an easy translation. */
17965 gdb_assert (per_cu->is_debug_types);
17966 sig_type = (struct signatured_type *) per_cu;
17968 gdb_assert (per_cu->cu == NULL);
17970 read_signatured_type (sig_type);
17972 gdb_assert (per_cu->cu != NULL);
17975 /* die_reader_func for read_signatured_type.
17976 This is identical to load_full_comp_unit_reader,
17977 but is kept separate for now. */
17980 read_signatured_type_reader (const struct die_reader_specs *reader,
17981 const gdb_byte *info_ptr,
17982 struct die_info *comp_unit_die,
17986 struct dwarf2_cu *cu = reader->cu;
17988 gdb_assert (cu->die_hash == NULL);
17990 htab_create_alloc_ex (cu->header.length / 12,
17994 &cu->comp_unit_obstack,
17995 hashtab_obstack_allocate,
17996 dummy_obstack_deallocate);
17999 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18000 &info_ptr, comp_unit_die);
18001 cu->dies = comp_unit_die;
18002 /* comp_unit_die is not stored in die_hash, no need. */
18004 /* We try not to read any attributes in this function, because not
18005 all CUs needed for references have been loaded yet, and symbol
18006 table processing isn't initialized. But we have to set the CU language,
18007 or we won't be able to build types correctly.
18008 Similarly, if we do not read the producer, we can not apply
18009 producer-specific interpretation. */
18010 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18013 /* Read in a signatured type and build its CU and DIEs.
18014 If the type is a stub for the real type in a DWO file,
18015 read in the real type from the DWO file as well. */
18018 read_signatured_type (struct signatured_type *sig_type)
18020 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18022 gdb_assert (per_cu->is_debug_types);
18023 gdb_assert (per_cu->cu == NULL);
18025 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18026 read_signatured_type_reader, NULL);
18029 /* Decode simple location descriptions.
18030 Given a pointer to a dwarf block that defines a location, compute
18031 the location and return the value.
18033 NOTE drow/2003-11-18: This function is called in two situations
18034 now: for the address of static or global variables (partial symbols
18035 only) and for offsets into structures which are expected to be
18036 (more or less) constant. The partial symbol case should go away,
18037 and only the constant case should remain. That will let this
18038 function complain more accurately. A few special modes are allowed
18039 without complaint for global variables (for instance, global
18040 register values and thread-local values).
18042 A location description containing no operations indicates that the
18043 object is optimized out. The return value is 0 for that case.
18044 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18045 callers will only want a very basic result and this can become a
18048 Note that stack[0] is unused except as a default error return. */
18051 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18053 struct objfile *objfile = cu->objfile;
18055 size_t size = blk->size;
18056 const gdb_byte *data = blk->data;
18057 CORE_ADDR stack[64];
18059 unsigned int bytes_read, unsnd;
18065 stack[++stacki] = 0;
18104 stack[++stacki] = op - DW_OP_lit0;
18139 stack[++stacki] = op - DW_OP_reg0;
18141 dwarf2_complex_location_expr_complaint ();
18145 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18147 stack[++stacki] = unsnd;
18149 dwarf2_complex_location_expr_complaint ();
18153 stack[++stacki] = read_address (objfile->obfd, &data[i],
18158 case DW_OP_const1u:
18159 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18163 case DW_OP_const1s:
18164 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18168 case DW_OP_const2u:
18169 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18173 case DW_OP_const2s:
18174 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18178 case DW_OP_const4u:
18179 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18183 case DW_OP_const4s:
18184 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18188 case DW_OP_const8u:
18189 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18194 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18200 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18205 stack[stacki + 1] = stack[stacki];
18210 stack[stacki - 1] += stack[stacki];
18214 case DW_OP_plus_uconst:
18215 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18221 stack[stacki - 1] -= stack[stacki];
18226 /* If we're not the last op, then we definitely can't encode
18227 this using GDB's address_class enum. This is valid for partial
18228 global symbols, although the variable's address will be bogus
18231 dwarf2_complex_location_expr_complaint ();
18234 case DW_OP_GNU_push_tls_address:
18235 /* The top of the stack has the offset from the beginning
18236 of the thread control block at which the variable is located. */
18237 /* Nothing should follow this operator, so the top of stack would
18239 /* This is valid for partial global symbols, but the variable's
18240 address will be bogus in the psymtab. Make it always at least
18241 non-zero to not look as a variable garbage collected by linker
18242 which have DW_OP_addr 0. */
18244 dwarf2_complex_location_expr_complaint ();
18248 case DW_OP_GNU_uninit:
18251 case DW_OP_GNU_addr_index:
18252 case DW_OP_GNU_const_index:
18253 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18260 const char *name = get_DW_OP_name (op);
18263 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18266 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18270 return (stack[stacki]);
18273 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18274 outside of the allocated space. Also enforce minimum>0. */
18275 if (stacki >= ARRAY_SIZE (stack) - 1)
18277 complaint (&symfile_complaints,
18278 _("location description stack overflow"));
18284 complaint (&symfile_complaints,
18285 _("location description stack underflow"));
18289 return (stack[stacki]);
18292 /* memory allocation interface */
18294 static struct dwarf_block *
18295 dwarf_alloc_block (struct dwarf2_cu *cu)
18297 struct dwarf_block *blk;
18299 blk = (struct dwarf_block *)
18300 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18304 static struct die_info *
18305 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18307 struct die_info *die;
18308 size_t size = sizeof (struct die_info);
18311 size += (num_attrs - 1) * sizeof (struct attribute);
18313 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18314 memset (die, 0, sizeof (struct die_info));
18319 /* Macro support. */
18321 /* Return file name relative to the compilation directory of file number I in
18322 *LH's file name table. The result is allocated using xmalloc; the caller is
18323 responsible for freeing it. */
18326 file_file_name (int file, struct line_header *lh)
18328 /* Is the file number a valid index into the line header's file name
18329 table? Remember that file numbers start with one, not zero. */
18330 if (1 <= file && file <= lh->num_file_names)
18332 struct file_entry *fe = &lh->file_names[file - 1];
18334 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18335 return xstrdup (fe->name);
18336 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18341 /* The compiler produced a bogus file number. We can at least
18342 record the macro definitions made in the file, even if we
18343 won't be able to find the file by name. */
18344 char fake_name[80];
18346 xsnprintf (fake_name, sizeof (fake_name),
18347 "<bad macro file number %d>", file);
18349 complaint (&symfile_complaints,
18350 _("bad file number in macro information (%d)"),
18353 return xstrdup (fake_name);
18357 /* Return the full name of file number I in *LH's file name table.
18358 Use COMP_DIR as the name of the current directory of the
18359 compilation. The result is allocated using xmalloc; the caller is
18360 responsible for freeing it. */
18362 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18364 /* Is the file number a valid index into the line header's file name
18365 table? Remember that file numbers start with one, not zero. */
18366 if (1 <= file && file <= lh->num_file_names)
18368 char *relative = file_file_name (file, lh);
18370 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18372 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18375 return file_file_name (file, lh);
18379 static struct macro_source_file *
18380 macro_start_file (int file, int line,
18381 struct macro_source_file *current_file,
18382 const char *comp_dir,
18383 struct line_header *lh, struct objfile *objfile)
18385 /* File name relative to the compilation directory of this source file. */
18386 char *file_name = file_file_name (file, lh);
18388 /* We don't create a macro table for this compilation unit
18389 at all until we actually get a filename. */
18390 if (! pending_macros)
18391 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18392 objfile->per_bfd->macro_cache,
18395 if (! current_file)
18397 /* If we have no current file, then this must be the start_file
18398 directive for the compilation unit's main source file. */
18399 current_file = macro_set_main (pending_macros, file_name);
18400 macro_define_special (pending_macros);
18403 current_file = macro_include (current_file, line, file_name);
18407 return current_file;
18411 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18412 followed by a null byte. */
18414 copy_string (const char *buf, int len)
18416 char *s = xmalloc (len + 1);
18418 memcpy (s, buf, len);
18424 static const char *
18425 consume_improper_spaces (const char *p, const char *body)
18429 complaint (&symfile_complaints,
18430 _("macro definition contains spaces "
18431 "in formal argument list:\n`%s'"),
18443 parse_macro_definition (struct macro_source_file *file, int line,
18448 /* The body string takes one of two forms. For object-like macro
18449 definitions, it should be:
18451 <macro name> " " <definition>
18453 For function-like macro definitions, it should be:
18455 <macro name> "() " <definition>
18457 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
18459 Spaces may appear only where explicitly indicated, and in the
18462 The Dwarf 2 spec says that an object-like macro's name is always
18463 followed by a space, but versions of GCC around March 2002 omit
18464 the space when the macro's definition is the empty string.
18466 The Dwarf 2 spec says that there should be no spaces between the
18467 formal arguments in a function-like macro's formal argument list,
18468 but versions of GCC around March 2002 include spaces after the
18472 /* Find the extent of the macro name. The macro name is terminated
18473 by either a space or null character (for an object-like macro) or
18474 an opening paren (for a function-like macro). */
18475 for (p = body; *p; p++)
18476 if (*p == ' ' || *p == '(')
18479 if (*p == ' ' || *p == '\0')
18481 /* It's an object-like macro. */
18482 int name_len = p - body;
18483 char *name = copy_string (body, name_len);
18484 const char *replacement;
18487 replacement = body + name_len + 1;
18490 dwarf2_macro_malformed_definition_complaint (body);
18491 replacement = body + name_len;
18494 macro_define_object (file, line, name, replacement);
18498 else if (*p == '(')
18500 /* It's a function-like macro. */
18501 char *name = copy_string (body, p - body);
18504 char **argv = xmalloc (argv_size * sizeof (*argv));
18508 p = consume_improper_spaces (p, body);
18510 /* Parse the formal argument list. */
18511 while (*p && *p != ')')
18513 /* Find the extent of the current argument name. */
18514 const char *arg_start = p;
18516 while (*p && *p != ',' && *p != ')' && *p != ' ')
18519 if (! *p || p == arg_start)
18520 dwarf2_macro_malformed_definition_complaint (body);
18523 /* Make sure argv has room for the new argument. */
18524 if (argc >= argv_size)
18527 argv = xrealloc (argv, argv_size * sizeof (*argv));
18530 argv[argc++] = copy_string (arg_start, p - arg_start);
18533 p = consume_improper_spaces (p, body);
18535 /* Consume the comma, if present. */
18540 p = consume_improper_spaces (p, body);
18549 /* Perfectly formed definition, no complaints. */
18550 macro_define_function (file, line, name,
18551 argc, (const char **) argv,
18553 else if (*p == '\0')
18555 /* Complain, but do define it. */
18556 dwarf2_macro_malformed_definition_complaint (body);
18557 macro_define_function (file, line, name,
18558 argc, (const char **) argv,
18562 /* Just complain. */
18563 dwarf2_macro_malformed_definition_complaint (body);
18566 /* Just complain. */
18567 dwarf2_macro_malformed_definition_complaint (body);
18573 for (i = 0; i < argc; i++)
18579 dwarf2_macro_malformed_definition_complaint (body);
18582 /* Skip some bytes from BYTES according to the form given in FORM.
18583 Returns the new pointer. */
18585 static const gdb_byte *
18586 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
18587 enum dwarf_form form,
18588 unsigned int offset_size,
18589 struct dwarf2_section_info *section)
18591 unsigned int bytes_read;
18595 case DW_FORM_data1:
18600 case DW_FORM_data2:
18604 case DW_FORM_data4:
18608 case DW_FORM_data8:
18612 case DW_FORM_string:
18613 read_direct_string (abfd, bytes, &bytes_read);
18614 bytes += bytes_read;
18617 case DW_FORM_sec_offset:
18619 case DW_FORM_GNU_strp_alt:
18620 bytes += offset_size;
18623 case DW_FORM_block:
18624 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
18625 bytes += bytes_read;
18628 case DW_FORM_block1:
18629 bytes += 1 + read_1_byte (abfd, bytes);
18631 case DW_FORM_block2:
18632 bytes += 2 + read_2_bytes (abfd, bytes);
18634 case DW_FORM_block4:
18635 bytes += 4 + read_4_bytes (abfd, bytes);
18638 case DW_FORM_sdata:
18639 case DW_FORM_udata:
18640 case DW_FORM_GNU_addr_index:
18641 case DW_FORM_GNU_str_index:
18642 bytes = gdb_skip_leb128 (bytes, buffer_end);
18645 dwarf2_section_buffer_overflow_complaint (section);
18653 complaint (&symfile_complaints,
18654 _("invalid form 0x%x in `%s'"),
18656 section->asection->name);
18664 /* A helper for dwarf_decode_macros that handles skipping an unknown
18665 opcode. Returns an updated pointer to the macro data buffer; or,
18666 on error, issues a complaint and returns NULL. */
18668 static const gdb_byte *
18669 skip_unknown_opcode (unsigned int opcode,
18670 const gdb_byte **opcode_definitions,
18671 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
18673 unsigned int offset_size,
18674 struct dwarf2_section_info *section)
18676 unsigned int bytes_read, i;
18678 const gdb_byte *defn;
18680 if (opcode_definitions[opcode] == NULL)
18682 complaint (&symfile_complaints,
18683 _("unrecognized DW_MACFINO opcode 0x%x"),
18688 defn = opcode_definitions[opcode];
18689 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
18690 defn += bytes_read;
18692 for (i = 0; i < arg; ++i)
18694 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
18696 if (mac_ptr == NULL)
18698 /* skip_form_bytes already issued the complaint. */
18706 /* A helper function which parses the header of a macro section.
18707 If the macro section is the extended (for now called "GNU") type,
18708 then this updates *OFFSET_SIZE. Returns a pointer to just after
18709 the header, or issues a complaint and returns NULL on error. */
18711 static const gdb_byte *
18712 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
18714 const gdb_byte *mac_ptr,
18715 unsigned int *offset_size,
18716 int section_is_gnu)
18718 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
18720 if (section_is_gnu)
18722 unsigned int version, flags;
18724 version = read_2_bytes (abfd, mac_ptr);
18727 complaint (&symfile_complaints,
18728 _("unrecognized version `%d' in .debug_macro section"),
18734 flags = read_1_byte (abfd, mac_ptr);
18736 *offset_size = (flags & 1) ? 8 : 4;
18738 if ((flags & 2) != 0)
18739 /* We don't need the line table offset. */
18740 mac_ptr += *offset_size;
18742 /* Vendor opcode descriptions. */
18743 if ((flags & 4) != 0)
18745 unsigned int i, count;
18747 count = read_1_byte (abfd, mac_ptr);
18749 for (i = 0; i < count; ++i)
18751 unsigned int opcode, bytes_read;
18754 opcode = read_1_byte (abfd, mac_ptr);
18756 opcode_definitions[opcode] = mac_ptr;
18757 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18758 mac_ptr += bytes_read;
18767 /* A helper for dwarf_decode_macros that handles the GNU extensions,
18768 including DW_MACRO_GNU_transparent_include. */
18771 dwarf_decode_macro_bytes (bfd *abfd,
18772 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
18773 struct macro_source_file *current_file,
18774 struct line_header *lh, const char *comp_dir,
18775 struct dwarf2_section_info *section,
18776 int section_is_gnu, int section_is_dwz,
18777 unsigned int offset_size,
18778 struct objfile *objfile,
18779 htab_t include_hash)
18781 enum dwarf_macro_record_type macinfo_type;
18782 int at_commandline;
18783 const gdb_byte *opcode_definitions[256];
18785 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
18786 &offset_size, section_is_gnu);
18787 if (mac_ptr == NULL)
18789 /* We already issued a complaint. */
18793 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
18794 GDB is still reading the definitions from command line. First
18795 DW_MACINFO_start_file will need to be ignored as it was already executed
18796 to create CURRENT_FILE for the main source holding also the command line
18797 definitions. On first met DW_MACINFO_start_file this flag is reset to
18798 normally execute all the remaining DW_MACINFO_start_file macinfos. */
18800 at_commandline = 1;
18804 /* Do we at least have room for a macinfo type byte? */
18805 if (mac_ptr >= mac_end)
18807 dwarf2_section_buffer_overflow_complaint (section);
18811 macinfo_type = read_1_byte (abfd, mac_ptr);
18814 /* Note that we rely on the fact that the corresponding GNU and
18815 DWARF constants are the same. */
18816 switch (macinfo_type)
18818 /* A zero macinfo type indicates the end of the macro
18823 case DW_MACRO_GNU_define:
18824 case DW_MACRO_GNU_undef:
18825 case DW_MACRO_GNU_define_indirect:
18826 case DW_MACRO_GNU_undef_indirect:
18827 case DW_MACRO_GNU_define_indirect_alt:
18828 case DW_MACRO_GNU_undef_indirect_alt:
18830 unsigned int bytes_read;
18835 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18836 mac_ptr += bytes_read;
18838 if (macinfo_type == DW_MACRO_GNU_define
18839 || macinfo_type == DW_MACRO_GNU_undef)
18841 body = read_direct_string (abfd, mac_ptr, &bytes_read);
18842 mac_ptr += bytes_read;
18846 LONGEST str_offset;
18848 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
18849 mac_ptr += offset_size;
18851 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
18852 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
18855 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18857 body = read_indirect_string_from_dwz (dwz, str_offset);
18860 body = read_indirect_string_at_offset (abfd, str_offset);
18863 is_define = (macinfo_type == DW_MACRO_GNU_define
18864 || macinfo_type == DW_MACRO_GNU_define_indirect
18865 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
18866 if (! current_file)
18868 /* DWARF violation as no main source is present. */
18869 complaint (&symfile_complaints,
18870 _("debug info with no main source gives macro %s "
18872 is_define ? _("definition") : _("undefinition"),
18876 if ((line == 0 && !at_commandline)
18877 || (line != 0 && at_commandline))
18878 complaint (&symfile_complaints,
18879 _("debug info gives %s macro %s with %s line %d: %s"),
18880 at_commandline ? _("command-line") : _("in-file"),
18881 is_define ? _("definition") : _("undefinition"),
18882 line == 0 ? _("zero") : _("non-zero"), line, body);
18885 parse_macro_definition (current_file, line, body);
18888 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
18889 || macinfo_type == DW_MACRO_GNU_undef_indirect
18890 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
18891 macro_undef (current_file, line, body);
18896 case DW_MACRO_GNU_start_file:
18898 unsigned int bytes_read;
18901 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18902 mac_ptr += bytes_read;
18903 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18904 mac_ptr += bytes_read;
18906 if ((line == 0 && !at_commandline)
18907 || (line != 0 && at_commandline))
18908 complaint (&symfile_complaints,
18909 _("debug info gives source %d included "
18910 "from %s at %s line %d"),
18911 file, at_commandline ? _("command-line") : _("file"),
18912 line == 0 ? _("zero") : _("non-zero"), line);
18914 if (at_commandline)
18916 /* This DW_MACRO_GNU_start_file was executed in the
18918 at_commandline = 0;
18921 current_file = macro_start_file (file, line,
18922 current_file, comp_dir,
18927 case DW_MACRO_GNU_end_file:
18928 if (! current_file)
18929 complaint (&symfile_complaints,
18930 _("macro debug info has an unmatched "
18931 "`close_file' directive"));
18934 current_file = current_file->included_by;
18935 if (! current_file)
18937 enum dwarf_macro_record_type next_type;
18939 /* GCC circa March 2002 doesn't produce the zero
18940 type byte marking the end of the compilation
18941 unit. Complain if it's not there, but exit no
18944 /* Do we at least have room for a macinfo type byte? */
18945 if (mac_ptr >= mac_end)
18947 dwarf2_section_buffer_overflow_complaint (section);
18951 /* We don't increment mac_ptr here, so this is just
18953 next_type = read_1_byte (abfd, mac_ptr);
18954 if (next_type != 0)
18955 complaint (&symfile_complaints,
18956 _("no terminating 0-type entry for "
18957 "macros in `.debug_macinfo' section"));
18964 case DW_MACRO_GNU_transparent_include:
18965 case DW_MACRO_GNU_transparent_include_alt:
18969 bfd *include_bfd = abfd;
18970 struct dwarf2_section_info *include_section = section;
18971 struct dwarf2_section_info alt_section;
18972 const gdb_byte *include_mac_end = mac_end;
18973 int is_dwz = section_is_dwz;
18974 const gdb_byte *new_mac_ptr;
18976 offset = read_offset_1 (abfd, mac_ptr, offset_size);
18977 mac_ptr += offset_size;
18979 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
18981 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18983 dwarf2_read_section (dwarf2_per_objfile->objfile,
18986 include_bfd = dwz->macro.asection->owner;
18987 include_section = &dwz->macro;
18988 include_mac_end = dwz->macro.buffer + dwz->macro.size;
18992 new_mac_ptr = include_section->buffer + offset;
18993 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
18997 /* This has actually happened; see
18998 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
18999 complaint (&symfile_complaints,
19000 _("recursive DW_MACRO_GNU_transparent_include in "
19001 ".debug_macro section"));
19005 *slot = (void *) new_mac_ptr;
19007 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19008 include_mac_end, current_file,
19010 section, section_is_gnu, is_dwz,
19011 offset_size, objfile, include_hash);
19013 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19018 case DW_MACINFO_vendor_ext:
19019 if (!section_is_gnu)
19021 unsigned int bytes_read;
19024 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19025 mac_ptr += bytes_read;
19026 read_direct_string (abfd, mac_ptr, &bytes_read);
19027 mac_ptr += bytes_read;
19029 /* We don't recognize any vendor extensions. */
19035 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19036 mac_ptr, mac_end, abfd, offset_size,
19038 if (mac_ptr == NULL)
19042 } while (macinfo_type != 0);
19046 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19047 const char *comp_dir, int section_is_gnu)
19049 struct objfile *objfile = dwarf2_per_objfile->objfile;
19050 struct line_header *lh = cu->line_header;
19052 const gdb_byte *mac_ptr, *mac_end;
19053 struct macro_source_file *current_file = 0;
19054 enum dwarf_macro_record_type macinfo_type;
19055 unsigned int offset_size = cu->header.offset_size;
19056 const gdb_byte *opcode_definitions[256];
19057 struct cleanup *cleanup;
19058 htab_t include_hash;
19060 struct dwarf2_section_info *section;
19061 const char *section_name;
19063 if (cu->dwo_unit != NULL)
19065 if (section_is_gnu)
19067 section = &cu->dwo_unit->dwo_file->sections.macro;
19068 section_name = ".debug_macro.dwo";
19072 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19073 section_name = ".debug_macinfo.dwo";
19078 if (section_is_gnu)
19080 section = &dwarf2_per_objfile->macro;
19081 section_name = ".debug_macro";
19085 section = &dwarf2_per_objfile->macinfo;
19086 section_name = ".debug_macinfo";
19090 dwarf2_read_section (objfile, section);
19091 if (section->buffer == NULL)
19093 complaint (&symfile_complaints, _("missing %s section"), section_name);
19096 abfd = section->asection->owner;
19098 /* First pass: Find the name of the base filename.
19099 This filename is needed in order to process all macros whose definition
19100 (or undefinition) comes from the command line. These macros are defined
19101 before the first DW_MACINFO_start_file entry, and yet still need to be
19102 associated to the base file.
19104 To determine the base file name, we scan the macro definitions until we
19105 reach the first DW_MACINFO_start_file entry. We then initialize
19106 CURRENT_FILE accordingly so that any macro definition found before the
19107 first DW_MACINFO_start_file can still be associated to the base file. */
19109 mac_ptr = section->buffer + offset;
19110 mac_end = section->buffer + section->size;
19112 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19113 &offset_size, section_is_gnu);
19114 if (mac_ptr == NULL)
19116 /* We already issued a complaint. */
19122 /* Do we at least have room for a macinfo type byte? */
19123 if (mac_ptr >= mac_end)
19125 /* Complaint is printed during the second pass as GDB will probably
19126 stop the first pass earlier upon finding
19127 DW_MACINFO_start_file. */
19131 macinfo_type = read_1_byte (abfd, mac_ptr);
19134 /* Note that we rely on the fact that the corresponding GNU and
19135 DWARF constants are the same. */
19136 switch (macinfo_type)
19138 /* A zero macinfo type indicates the end of the macro
19143 case DW_MACRO_GNU_define:
19144 case DW_MACRO_GNU_undef:
19145 /* Only skip the data by MAC_PTR. */
19147 unsigned int bytes_read;
19149 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19150 mac_ptr += bytes_read;
19151 read_direct_string (abfd, mac_ptr, &bytes_read);
19152 mac_ptr += bytes_read;
19156 case DW_MACRO_GNU_start_file:
19158 unsigned int bytes_read;
19161 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19162 mac_ptr += bytes_read;
19163 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19164 mac_ptr += bytes_read;
19166 current_file = macro_start_file (file, line, current_file,
19167 comp_dir, lh, objfile);
19171 case DW_MACRO_GNU_end_file:
19172 /* No data to skip by MAC_PTR. */
19175 case DW_MACRO_GNU_define_indirect:
19176 case DW_MACRO_GNU_undef_indirect:
19177 case DW_MACRO_GNU_define_indirect_alt:
19178 case DW_MACRO_GNU_undef_indirect_alt:
19180 unsigned int bytes_read;
19182 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19183 mac_ptr += bytes_read;
19184 mac_ptr += offset_size;
19188 case DW_MACRO_GNU_transparent_include:
19189 case DW_MACRO_GNU_transparent_include_alt:
19190 /* Note that, according to the spec, a transparent include
19191 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19192 skip this opcode. */
19193 mac_ptr += offset_size;
19196 case DW_MACINFO_vendor_ext:
19197 /* Only skip the data by MAC_PTR. */
19198 if (!section_is_gnu)
19200 unsigned int bytes_read;
19202 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19203 mac_ptr += bytes_read;
19204 read_direct_string (abfd, mac_ptr, &bytes_read);
19205 mac_ptr += bytes_read;
19210 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19211 mac_ptr, mac_end, abfd, offset_size,
19213 if (mac_ptr == NULL)
19217 } while (macinfo_type != 0 && current_file == NULL);
19219 /* Second pass: Process all entries.
19221 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19222 command-line macro definitions/undefinitions. This flag is unset when we
19223 reach the first DW_MACINFO_start_file entry. */
19225 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19226 NULL, xcalloc, xfree);
19227 cleanup = make_cleanup_htab_delete (include_hash);
19228 mac_ptr = section->buffer + offset;
19229 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19230 *slot = (void *) mac_ptr;
19231 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19232 current_file, lh, comp_dir, section,
19234 offset_size, objfile, include_hash);
19235 do_cleanups (cleanup);
19238 /* Check if the attribute's form is a DW_FORM_block*
19239 if so return true else false. */
19242 attr_form_is_block (struct attribute *attr)
19244 return (attr == NULL ? 0 :
19245 attr->form == DW_FORM_block1
19246 || attr->form == DW_FORM_block2
19247 || attr->form == DW_FORM_block4
19248 || attr->form == DW_FORM_block
19249 || attr->form == DW_FORM_exprloc);
19252 /* Return non-zero if ATTR's value is a section offset --- classes
19253 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19254 You may use DW_UNSND (attr) to retrieve such offsets.
19256 Section 7.5.4, "Attribute Encodings", explains that no attribute
19257 may have a value that belongs to more than one of these classes; it
19258 would be ambiguous if we did, because we use the same forms for all
19262 attr_form_is_section_offset (struct attribute *attr)
19264 return (attr->form == DW_FORM_data4
19265 || attr->form == DW_FORM_data8
19266 || attr->form == DW_FORM_sec_offset);
19269 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19270 zero otherwise. When this function returns true, you can apply
19271 dwarf2_get_attr_constant_value to it.
19273 However, note that for some attributes you must check
19274 attr_form_is_section_offset before using this test. DW_FORM_data4
19275 and DW_FORM_data8 are members of both the constant class, and of
19276 the classes that contain offsets into other debug sections
19277 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19278 that, if an attribute's can be either a constant or one of the
19279 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19280 taken as section offsets, not constants. */
19283 attr_form_is_constant (struct attribute *attr)
19285 switch (attr->form)
19287 case DW_FORM_sdata:
19288 case DW_FORM_udata:
19289 case DW_FORM_data1:
19290 case DW_FORM_data2:
19291 case DW_FORM_data4:
19292 case DW_FORM_data8:
19299 /* Return the .debug_loc section to use for CU.
19300 For DWO files use .debug_loc.dwo. */
19302 static struct dwarf2_section_info *
19303 cu_debug_loc_section (struct dwarf2_cu *cu)
19306 return &cu->dwo_unit->dwo_file->sections.loc;
19307 return &dwarf2_per_objfile->loc;
19310 /* A helper function that fills in a dwarf2_loclist_baton. */
19313 fill_in_loclist_baton (struct dwarf2_cu *cu,
19314 struct dwarf2_loclist_baton *baton,
19315 struct attribute *attr)
19317 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19319 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19321 baton->per_cu = cu->per_cu;
19322 gdb_assert (baton->per_cu);
19323 /* We don't know how long the location list is, but make sure we
19324 don't run off the edge of the section. */
19325 baton->size = section->size - DW_UNSND (attr);
19326 baton->data = section->buffer + DW_UNSND (attr);
19327 baton->base_address = cu->base_address;
19328 baton->from_dwo = cu->dwo_unit != NULL;
19332 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19333 struct dwarf2_cu *cu, int is_block)
19335 struct objfile *objfile = dwarf2_per_objfile->objfile;
19336 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19338 if (attr_form_is_section_offset (attr)
19339 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19340 the section. If so, fall through to the complaint in the
19342 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19344 struct dwarf2_loclist_baton *baton;
19346 baton = obstack_alloc (&objfile->objfile_obstack,
19347 sizeof (struct dwarf2_loclist_baton));
19349 fill_in_loclist_baton (cu, baton, attr);
19351 if (cu->base_known == 0)
19352 complaint (&symfile_complaints,
19353 _("Location list used without "
19354 "specifying the CU base address."));
19356 SYMBOL_ACLASS_INDEX (sym) = (is_block
19357 ? dwarf2_loclist_block_index
19358 : dwarf2_loclist_index);
19359 SYMBOL_LOCATION_BATON (sym) = baton;
19363 struct dwarf2_locexpr_baton *baton;
19365 baton = obstack_alloc (&objfile->objfile_obstack,
19366 sizeof (struct dwarf2_locexpr_baton));
19367 baton->per_cu = cu->per_cu;
19368 gdb_assert (baton->per_cu);
19370 if (attr_form_is_block (attr))
19372 /* Note that we're just copying the block's data pointer
19373 here, not the actual data. We're still pointing into the
19374 info_buffer for SYM's objfile; right now we never release
19375 that buffer, but when we do clean up properly this may
19377 baton->size = DW_BLOCK (attr)->size;
19378 baton->data = DW_BLOCK (attr)->data;
19382 dwarf2_invalid_attrib_class_complaint ("location description",
19383 SYMBOL_NATURAL_NAME (sym));
19387 SYMBOL_ACLASS_INDEX (sym) = (is_block
19388 ? dwarf2_locexpr_block_index
19389 : dwarf2_locexpr_index);
19390 SYMBOL_LOCATION_BATON (sym) = baton;
19394 /* Return the OBJFILE associated with the compilation unit CU. If CU
19395 came from a separate debuginfo file, then the master objfile is
19399 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19401 struct objfile *objfile = per_cu->objfile;
19403 /* Return the master objfile, so that we can report and look up the
19404 correct file containing this variable. */
19405 if (objfile->separate_debug_objfile_backlink)
19406 objfile = objfile->separate_debug_objfile_backlink;
19411 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19412 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19413 CU_HEADERP first. */
19415 static const struct comp_unit_head *
19416 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19417 struct dwarf2_per_cu_data *per_cu)
19419 const gdb_byte *info_ptr;
19422 return &per_cu->cu->header;
19424 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
19426 memset (cu_headerp, 0, sizeof (*cu_headerp));
19427 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
19432 /* Return the address size given in the compilation unit header for CU. */
19435 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
19437 struct comp_unit_head cu_header_local;
19438 const struct comp_unit_head *cu_headerp;
19440 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19442 return cu_headerp->addr_size;
19445 /* Return the offset size given in the compilation unit header for CU. */
19448 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
19450 struct comp_unit_head cu_header_local;
19451 const struct comp_unit_head *cu_headerp;
19453 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19455 return cu_headerp->offset_size;
19458 /* See its dwarf2loc.h declaration. */
19461 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
19463 struct comp_unit_head cu_header_local;
19464 const struct comp_unit_head *cu_headerp;
19466 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19468 if (cu_headerp->version == 2)
19469 return cu_headerp->addr_size;
19471 return cu_headerp->offset_size;
19474 /* Return the text offset of the CU. The returned offset comes from
19475 this CU's objfile. If this objfile came from a separate debuginfo
19476 file, then the offset may be different from the corresponding
19477 offset in the parent objfile. */
19480 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
19482 struct objfile *objfile = per_cu->objfile;
19484 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19487 /* Locate the .debug_info compilation unit from CU's objfile which contains
19488 the DIE at OFFSET. Raises an error on failure. */
19490 static struct dwarf2_per_cu_data *
19491 dwarf2_find_containing_comp_unit (sect_offset offset,
19492 unsigned int offset_in_dwz,
19493 struct objfile *objfile)
19495 struct dwarf2_per_cu_data *this_cu;
19497 const sect_offset *cu_off;
19500 high = dwarf2_per_objfile->n_comp_units - 1;
19503 struct dwarf2_per_cu_data *mid_cu;
19504 int mid = low + (high - low) / 2;
19506 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
19507 cu_off = &mid_cu->offset;
19508 if (mid_cu->is_dwz > offset_in_dwz
19509 || (mid_cu->is_dwz == offset_in_dwz
19510 && cu_off->sect_off >= offset.sect_off))
19515 gdb_assert (low == high);
19516 this_cu = dwarf2_per_objfile->all_comp_units[low];
19517 cu_off = &this_cu->offset;
19518 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
19520 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
19521 error (_("Dwarf Error: could not find partial DIE containing "
19522 "offset 0x%lx [in module %s]"),
19523 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
19525 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
19526 <= offset.sect_off);
19527 return dwarf2_per_objfile->all_comp_units[low-1];
19531 this_cu = dwarf2_per_objfile->all_comp_units[low];
19532 if (low == dwarf2_per_objfile->n_comp_units - 1
19533 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
19534 error (_("invalid dwarf2 offset %u"), offset.sect_off);
19535 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
19540 /* Initialize dwarf2_cu CU, owned by PER_CU. */
19543 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
19545 memset (cu, 0, sizeof (*cu));
19547 cu->per_cu = per_cu;
19548 cu->objfile = per_cu->objfile;
19549 obstack_init (&cu->comp_unit_obstack);
19552 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
19555 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
19556 enum language pretend_language)
19558 struct attribute *attr;
19560 /* Set the language we're debugging. */
19561 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
19563 set_cu_language (DW_UNSND (attr), cu);
19566 cu->language = pretend_language;
19567 cu->language_defn = language_def (cu->language);
19570 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
19572 cu->producer = DW_STRING (attr);
19575 /* Release one cached compilation unit, CU. We unlink it from the tree
19576 of compilation units, but we don't remove it from the read_in_chain;
19577 the caller is responsible for that.
19578 NOTE: DATA is a void * because this function is also used as a
19579 cleanup routine. */
19582 free_heap_comp_unit (void *data)
19584 struct dwarf2_cu *cu = data;
19586 gdb_assert (cu->per_cu != NULL);
19587 cu->per_cu->cu = NULL;
19590 obstack_free (&cu->comp_unit_obstack, NULL);
19595 /* This cleanup function is passed the address of a dwarf2_cu on the stack
19596 when we're finished with it. We can't free the pointer itself, but be
19597 sure to unlink it from the cache. Also release any associated storage. */
19600 free_stack_comp_unit (void *data)
19602 struct dwarf2_cu *cu = data;
19604 gdb_assert (cu->per_cu != NULL);
19605 cu->per_cu->cu = NULL;
19608 obstack_free (&cu->comp_unit_obstack, NULL);
19609 cu->partial_dies = NULL;
19612 /* Free all cached compilation units. */
19615 free_cached_comp_units (void *data)
19617 struct dwarf2_per_cu_data *per_cu, **last_chain;
19619 per_cu = dwarf2_per_objfile->read_in_chain;
19620 last_chain = &dwarf2_per_objfile->read_in_chain;
19621 while (per_cu != NULL)
19623 struct dwarf2_per_cu_data *next_cu;
19625 next_cu = per_cu->cu->read_in_chain;
19627 free_heap_comp_unit (per_cu->cu);
19628 *last_chain = next_cu;
19634 /* Increase the age counter on each cached compilation unit, and free
19635 any that are too old. */
19638 age_cached_comp_units (void)
19640 struct dwarf2_per_cu_data *per_cu, **last_chain;
19642 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
19643 per_cu = dwarf2_per_objfile->read_in_chain;
19644 while (per_cu != NULL)
19646 per_cu->cu->last_used ++;
19647 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
19648 dwarf2_mark (per_cu->cu);
19649 per_cu = per_cu->cu->read_in_chain;
19652 per_cu = dwarf2_per_objfile->read_in_chain;
19653 last_chain = &dwarf2_per_objfile->read_in_chain;
19654 while (per_cu != NULL)
19656 struct dwarf2_per_cu_data *next_cu;
19658 next_cu = per_cu->cu->read_in_chain;
19660 if (!per_cu->cu->mark)
19662 free_heap_comp_unit (per_cu->cu);
19663 *last_chain = next_cu;
19666 last_chain = &per_cu->cu->read_in_chain;
19672 /* Remove a single compilation unit from the cache. */
19675 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
19677 struct dwarf2_per_cu_data *per_cu, **last_chain;
19679 per_cu = dwarf2_per_objfile->read_in_chain;
19680 last_chain = &dwarf2_per_objfile->read_in_chain;
19681 while (per_cu != NULL)
19683 struct dwarf2_per_cu_data *next_cu;
19685 next_cu = per_cu->cu->read_in_chain;
19687 if (per_cu == target_per_cu)
19689 free_heap_comp_unit (per_cu->cu);
19691 *last_chain = next_cu;
19695 last_chain = &per_cu->cu->read_in_chain;
19701 /* Release all extra memory associated with OBJFILE. */
19704 dwarf2_free_objfile (struct objfile *objfile)
19706 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
19708 if (dwarf2_per_objfile == NULL)
19711 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
19712 free_cached_comp_units (NULL);
19714 if (dwarf2_per_objfile->quick_file_names_table)
19715 htab_delete (dwarf2_per_objfile->quick_file_names_table);
19717 /* Everything else should be on the objfile obstack. */
19720 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
19721 We store these in a hash table separate from the DIEs, and preserve them
19722 when the DIEs are flushed out of cache.
19724 The CU "per_cu" pointer is needed because offset alone is not enough to
19725 uniquely identify the type. A file may have multiple .debug_types sections,
19726 or the type may come from a DWO file. Furthermore, while it's more logical
19727 to use per_cu->section+offset, with Fission the section with the data is in
19728 the DWO file but we don't know that section at the point we need it.
19729 We have to use something in dwarf2_per_cu_data (or the pointer to it)
19730 because we can enter the lookup routine, get_die_type_at_offset, from
19731 outside this file, and thus won't necessarily have PER_CU->cu.
19732 Fortunately, PER_CU is stable for the life of the objfile. */
19734 struct dwarf2_per_cu_offset_and_type
19736 const struct dwarf2_per_cu_data *per_cu;
19737 sect_offset offset;
19741 /* Hash function for a dwarf2_per_cu_offset_and_type. */
19744 per_cu_offset_and_type_hash (const void *item)
19746 const struct dwarf2_per_cu_offset_and_type *ofs = item;
19748 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
19751 /* Equality function for a dwarf2_per_cu_offset_and_type. */
19754 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
19756 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
19757 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
19759 return (ofs_lhs->per_cu == ofs_rhs->per_cu
19760 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
19763 /* Set the type associated with DIE to TYPE. Save it in CU's hash
19764 table if necessary. For convenience, return TYPE.
19766 The DIEs reading must have careful ordering to:
19767 * Not cause infite loops trying to read in DIEs as a prerequisite for
19768 reading current DIE.
19769 * Not trying to dereference contents of still incompletely read in types
19770 while reading in other DIEs.
19771 * Enable referencing still incompletely read in types just by a pointer to
19772 the type without accessing its fields.
19774 Therefore caller should follow these rules:
19775 * Try to fetch any prerequisite types we may need to build this DIE type
19776 before building the type and calling set_die_type.
19777 * After building type call set_die_type for current DIE as soon as
19778 possible before fetching more types to complete the current type.
19779 * Make the type as complete as possible before fetching more types. */
19781 static struct type *
19782 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19784 struct dwarf2_per_cu_offset_and_type **slot, ofs;
19785 struct objfile *objfile = cu->objfile;
19787 /* For Ada types, make sure that the gnat-specific data is always
19788 initialized (if not already set). There are a few types where
19789 we should not be doing so, because the type-specific area is
19790 already used to hold some other piece of info (eg: TYPE_CODE_FLT
19791 where the type-specific area is used to store the floatformat).
19792 But this is not a problem, because the gnat-specific information
19793 is actually not needed for these types. */
19794 if (need_gnat_info (cu)
19795 && TYPE_CODE (type) != TYPE_CODE_FUNC
19796 && TYPE_CODE (type) != TYPE_CODE_FLT
19797 && !HAVE_GNAT_AUX_INFO (type))
19798 INIT_GNAT_SPECIFIC (type);
19800 if (dwarf2_per_objfile->die_type_hash == NULL)
19802 dwarf2_per_objfile->die_type_hash =
19803 htab_create_alloc_ex (127,
19804 per_cu_offset_and_type_hash,
19805 per_cu_offset_and_type_eq,
19807 &objfile->objfile_obstack,
19808 hashtab_obstack_allocate,
19809 dummy_obstack_deallocate);
19812 ofs.per_cu = cu->per_cu;
19813 ofs.offset = die->offset;
19815 slot = (struct dwarf2_per_cu_offset_and_type **)
19816 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
19818 complaint (&symfile_complaints,
19819 _("A problem internal to GDB: DIE 0x%x has type already set"),
19820 die->offset.sect_off);
19821 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
19826 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
19827 or return NULL if the die does not have a saved type. */
19829 static struct type *
19830 get_die_type_at_offset (sect_offset offset,
19831 struct dwarf2_per_cu_data *per_cu)
19833 struct dwarf2_per_cu_offset_and_type *slot, ofs;
19835 if (dwarf2_per_objfile->die_type_hash == NULL)
19838 ofs.per_cu = per_cu;
19839 ofs.offset = offset;
19840 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
19847 /* Look up the type for DIE in CU in die_type_hash,
19848 or return NULL if DIE does not have a saved type. */
19850 static struct type *
19851 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
19853 return get_die_type_at_offset (die->offset, cu->per_cu);
19856 /* Add a dependence relationship from CU to REF_PER_CU. */
19859 dwarf2_add_dependence (struct dwarf2_cu *cu,
19860 struct dwarf2_per_cu_data *ref_per_cu)
19864 if (cu->dependencies == NULL)
19866 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
19867 NULL, &cu->comp_unit_obstack,
19868 hashtab_obstack_allocate,
19869 dummy_obstack_deallocate);
19871 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
19873 *slot = ref_per_cu;
19876 /* Subroutine of dwarf2_mark to pass to htab_traverse.
19877 Set the mark field in every compilation unit in the
19878 cache that we must keep because we are keeping CU. */
19881 dwarf2_mark_helper (void **slot, void *data)
19883 struct dwarf2_per_cu_data *per_cu;
19885 per_cu = (struct dwarf2_per_cu_data *) *slot;
19887 /* cu->dependencies references may not yet have been ever read if QUIT aborts
19888 reading of the chain. As such dependencies remain valid it is not much
19889 useful to track and undo them during QUIT cleanups. */
19890 if (per_cu->cu == NULL)
19893 if (per_cu->cu->mark)
19895 per_cu->cu->mark = 1;
19897 if (per_cu->cu->dependencies != NULL)
19898 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
19903 /* Set the mark field in CU and in every other compilation unit in the
19904 cache that we must keep because we are keeping CU. */
19907 dwarf2_mark (struct dwarf2_cu *cu)
19912 if (cu->dependencies != NULL)
19913 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
19917 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
19921 per_cu->cu->mark = 0;
19922 per_cu = per_cu->cu->read_in_chain;
19926 /* Trivial hash function for partial_die_info: the hash value of a DIE
19927 is its offset in .debug_info for this objfile. */
19930 partial_die_hash (const void *item)
19932 const struct partial_die_info *part_die = item;
19934 return part_die->offset.sect_off;
19937 /* Trivial comparison function for partial_die_info structures: two DIEs
19938 are equal if they have the same offset. */
19941 partial_die_eq (const void *item_lhs, const void *item_rhs)
19943 const struct partial_die_info *part_die_lhs = item_lhs;
19944 const struct partial_die_info *part_die_rhs = item_rhs;
19946 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
19949 static struct cmd_list_element *set_dwarf2_cmdlist;
19950 static struct cmd_list_element *show_dwarf2_cmdlist;
19953 set_dwarf2_cmd (char *args, int from_tty)
19955 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
19959 show_dwarf2_cmd (char *args, int from_tty)
19961 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
19964 /* Free data associated with OBJFILE, if necessary. */
19967 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
19969 struct dwarf2_per_objfile *data = d;
19972 for (ix = 0; ix < dwarf2_per_objfile->n_comp_units; ++ix)
19973 VEC_free (dwarf2_per_cu_ptr,
19974 dwarf2_per_objfile->all_comp_units[ix]->imported_symtabs);
19976 for (ix = 0; ix < dwarf2_per_objfile->n_type_units; ++ix)
19977 VEC_free (dwarf2_per_cu_ptr,
19978 dwarf2_per_objfile->all_type_units[ix]->per_cu.imported_symtabs);
19980 VEC_free (dwarf2_section_info_def, data->types);
19982 if (data->dwo_files)
19983 free_dwo_files (data->dwo_files, objfile);
19984 if (data->dwp_file)
19985 gdb_bfd_unref (data->dwp_file->dbfd);
19987 if (data->dwz_file && data->dwz_file->dwz_bfd)
19988 gdb_bfd_unref (data->dwz_file->dwz_bfd);
19992 /* The "save gdb-index" command. */
19994 /* The contents of the hash table we create when building the string
19996 struct strtab_entry
19998 offset_type offset;
20002 /* Hash function for a strtab_entry.
20004 Function is used only during write_hash_table so no index format backward
20005 compatibility is needed. */
20008 hash_strtab_entry (const void *e)
20010 const struct strtab_entry *entry = e;
20011 return mapped_index_string_hash (INT_MAX, entry->str);
20014 /* Equality function for a strtab_entry. */
20017 eq_strtab_entry (const void *a, const void *b)
20019 const struct strtab_entry *ea = a;
20020 const struct strtab_entry *eb = b;
20021 return !strcmp (ea->str, eb->str);
20024 /* Create a strtab_entry hash table. */
20027 create_strtab (void)
20029 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
20030 xfree, xcalloc, xfree);
20033 /* Add a string to the constant pool. Return the string's offset in
20037 add_string (htab_t table, struct obstack *cpool, const char *str)
20040 struct strtab_entry entry;
20041 struct strtab_entry *result;
20044 slot = htab_find_slot (table, &entry, INSERT);
20049 result = XNEW (struct strtab_entry);
20050 result->offset = obstack_object_size (cpool);
20052 obstack_grow_str0 (cpool, str);
20055 return result->offset;
20058 /* An entry in the symbol table. */
20059 struct symtab_index_entry
20061 /* The name of the symbol. */
20063 /* The offset of the name in the constant pool. */
20064 offset_type index_offset;
20065 /* A sorted vector of the indices of all the CUs that hold an object
20067 VEC (offset_type) *cu_indices;
20070 /* The symbol table. This is a power-of-2-sized hash table. */
20071 struct mapped_symtab
20073 offset_type n_elements;
20075 struct symtab_index_entry **data;
20078 /* Hash function for a symtab_index_entry. */
20081 hash_symtab_entry (const void *e)
20083 const struct symtab_index_entry *entry = e;
20084 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
20085 sizeof (offset_type) * VEC_length (offset_type,
20086 entry->cu_indices),
20090 /* Equality function for a symtab_index_entry. */
20093 eq_symtab_entry (const void *a, const void *b)
20095 const struct symtab_index_entry *ea = a;
20096 const struct symtab_index_entry *eb = b;
20097 int len = VEC_length (offset_type, ea->cu_indices);
20098 if (len != VEC_length (offset_type, eb->cu_indices))
20100 return !memcmp (VEC_address (offset_type, ea->cu_indices),
20101 VEC_address (offset_type, eb->cu_indices),
20102 sizeof (offset_type) * len);
20105 /* Destroy a symtab_index_entry. */
20108 delete_symtab_entry (void *p)
20110 struct symtab_index_entry *entry = p;
20111 VEC_free (offset_type, entry->cu_indices);
20115 /* Create a hash table holding symtab_index_entry objects. */
20118 create_symbol_hash_table (void)
20120 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
20121 delete_symtab_entry, xcalloc, xfree);
20124 /* Create a new mapped symtab object. */
20126 static struct mapped_symtab *
20127 create_mapped_symtab (void)
20129 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20130 symtab->n_elements = 0;
20131 symtab->size = 1024;
20132 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20136 /* Destroy a mapped_symtab. */
20139 cleanup_mapped_symtab (void *p)
20141 struct mapped_symtab *symtab = p;
20142 /* The contents of the array are freed when the other hash table is
20144 xfree (symtab->data);
20148 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20151 Function is used only during write_hash_table so no index format backward
20152 compatibility is needed. */
20154 static struct symtab_index_entry **
20155 find_slot (struct mapped_symtab *symtab, const char *name)
20157 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20159 index = hash & (symtab->size - 1);
20160 step = ((hash * 17) & (symtab->size - 1)) | 1;
20164 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20165 return &symtab->data[index];
20166 index = (index + step) & (symtab->size - 1);
20170 /* Expand SYMTAB's hash table. */
20173 hash_expand (struct mapped_symtab *symtab)
20175 offset_type old_size = symtab->size;
20177 struct symtab_index_entry **old_entries = symtab->data;
20180 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20182 for (i = 0; i < old_size; ++i)
20184 if (old_entries[i])
20186 struct symtab_index_entry **slot = find_slot (symtab,
20187 old_entries[i]->name);
20188 *slot = old_entries[i];
20192 xfree (old_entries);
20195 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20196 CU_INDEX is the index of the CU in which the symbol appears.
20197 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20200 add_index_entry (struct mapped_symtab *symtab, const char *name,
20201 int is_static, gdb_index_symbol_kind kind,
20202 offset_type cu_index)
20204 struct symtab_index_entry **slot;
20205 offset_type cu_index_and_attrs;
20207 ++symtab->n_elements;
20208 if (4 * symtab->n_elements / 3 >= symtab->size)
20209 hash_expand (symtab);
20211 slot = find_slot (symtab, name);
20214 *slot = XNEW (struct symtab_index_entry);
20215 (*slot)->name = name;
20216 /* index_offset is set later. */
20217 (*slot)->cu_indices = NULL;
20220 cu_index_and_attrs = 0;
20221 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20222 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20223 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20225 /* We don't want to record an index value twice as we want to avoid the
20227 We process all global symbols and then all static symbols
20228 (which would allow us to avoid the duplication by only having to check
20229 the last entry pushed), but a symbol could have multiple kinds in one CU.
20230 To keep things simple we don't worry about the duplication here and
20231 sort and uniqufy the list after we've processed all symbols. */
20232 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20235 /* qsort helper routine for uniquify_cu_indices. */
20238 offset_type_compare (const void *ap, const void *bp)
20240 offset_type a = *(offset_type *) ap;
20241 offset_type b = *(offset_type *) bp;
20243 return (a > b) - (b > a);
20246 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20249 uniquify_cu_indices (struct mapped_symtab *symtab)
20253 for (i = 0; i < symtab->size; ++i)
20255 struct symtab_index_entry *entry = symtab->data[i];
20258 && entry->cu_indices != NULL)
20260 unsigned int next_to_insert, next_to_check;
20261 offset_type last_value;
20263 qsort (VEC_address (offset_type, entry->cu_indices),
20264 VEC_length (offset_type, entry->cu_indices),
20265 sizeof (offset_type), offset_type_compare);
20267 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20268 next_to_insert = 1;
20269 for (next_to_check = 1;
20270 next_to_check < VEC_length (offset_type, entry->cu_indices);
20273 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20276 last_value = VEC_index (offset_type, entry->cu_indices,
20278 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20283 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20288 /* Add a vector of indices to the constant pool. */
20291 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20292 struct symtab_index_entry *entry)
20296 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20299 offset_type len = VEC_length (offset_type, entry->cu_indices);
20300 offset_type val = MAYBE_SWAP (len);
20305 entry->index_offset = obstack_object_size (cpool);
20307 obstack_grow (cpool, &val, sizeof (val));
20309 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20312 val = MAYBE_SWAP (iter);
20313 obstack_grow (cpool, &val, sizeof (val));
20318 struct symtab_index_entry *old_entry = *slot;
20319 entry->index_offset = old_entry->index_offset;
20322 return entry->index_offset;
20325 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20326 constant pool entries going into the obstack CPOOL. */
20329 write_hash_table (struct mapped_symtab *symtab,
20330 struct obstack *output, struct obstack *cpool)
20333 htab_t symbol_hash_table;
20336 symbol_hash_table = create_symbol_hash_table ();
20337 str_table = create_strtab ();
20339 /* We add all the index vectors to the constant pool first, to
20340 ensure alignment is ok. */
20341 for (i = 0; i < symtab->size; ++i)
20343 if (symtab->data[i])
20344 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20347 /* Now write out the hash table. */
20348 for (i = 0; i < symtab->size; ++i)
20350 offset_type str_off, vec_off;
20352 if (symtab->data[i])
20354 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20355 vec_off = symtab->data[i]->index_offset;
20359 /* While 0 is a valid constant pool index, it is not valid
20360 to have 0 for both offsets. */
20365 str_off = MAYBE_SWAP (str_off);
20366 vec_off = MAYBE_SWAP (vec_off);
20368 obstack_grow (output, &str_off, sizeof (str_off));
20369 obstack_grow (output, &vec_off, sizeof (vec_off));
20372 htab_delete (str_table);
20373 htab_delete (symbol_hash_table);
20376 /* Struct to map psymtab to CU index in the index file. */
20377 struct psymtab_cu_index_map
20379 struct partial_symtab *psymtab;
20380 unsigned int cu_index;
20384 hash_psymtab_cu_index (const void *item)
20386 const struct psymtab_cu_index_map *map = item;
20388 return htab_hash_pointer (map->psymtab);
20392 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
20394 const struct psymtab_cu_index_map *lhs = item_lhs;
20395 const struct psymtab_cu_index_map *rhs = item_rhs;
20397 return lhs->psymtab == rhs->psymtab;
20400 /* Helper struct for building the address table. */
20401 struct addrmap_index_data
20403 struct objfile *objfile;
20404 struct obstack *addr_obstack;
20405 htab_t cu_index_htab;
20407 /* Non-zero if the previous_* fields are valid.
20408 We can't write an entry until we see the next entry (since it is only then
20409 that we know the end of the entry). */
20410 int previous_valid;
20411 /* Index of the CU in the table of all CUs in the index file. */
20412 unsigned int previous_cu_index;
20413 /* Start address of the CU. */
20414 CORE_ADDR previous_cu_start;
20417 /* Write an address entry to OBSTACK. */
20420 add_address_entry (struct objfile *objfile, struct obstack *obstack,
20421 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
20423 offset_type cu_index_to_write;
20425 CORE_ADDR baseaddr;
20427 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20429 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
20430 obstack_grow (obstack, addr, 8);
20431 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
20432 obstack_grow (obstack, addr, 8);
20433 cu_index_to_write = MAYBE_SWAP (cu_index);
20434 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
20437 /* Worker function for traversing an addrmap to build the address table. */
20440 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
20442 struct addrmap_index_data *data = datap;
20443 struct partial_symtab *pst = obj;
20445 if (data->previous_valid)
20446 add_address_entry (data->objfile, data->addr_obstack,
20447 data->previous_cu_start, start_addr,
20448 data->previous_cu_index);
20450 data->previous_cu_start = start_addr;
20453 struct psymtab_cu_index_map find_map, *map;
20454 find_map.psymtab = pst;
20455 map = htab_find (data->cu_index_htab, &find_map);
20456 gdb_assert (map != NULL);
20457 data->previous_cu_index = map->cu_index;
20458 data->previous_valid = 1;
20461 data->previous_valid = 0;
20466 /* Write OBJFILE's address map to OBSTACK.
20467 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
20468 in the index file. */
20471 write_address_map (struct objfile *objfile, struct obstack *obstack,
20472 htab_t cu_index_htab)
20474 struct addrmap_index_data addrmap_index_data;
20476 /* When writing the address table, we have to cope with the fact that
20477 the addrmap iterator only provides the start of a region; we have to
20478 wait until the next invocation to get the start of the next region. */
20480 addrmap_index_data.objfile = objfile;
20481 addrmap_index_data.addr_obstack = obstack;
20482 addrmap_index_data.cu_index_htab = cu_index_htab;
20483 addrmap_index_data.previous_valid = 0;
20485 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
20486 &addrmap_index_data);
20488 /* It's highly unlikely the last entry (end address = 0xff...ff)
20489 is valid, but we should still handle it.
20490 The end address is recorded as the start of the next region, but that
20491 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
20493 if (addrmap_index_data.previous_valid)
20494 add_address_entry (objfile, obstack,
20495 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
20496 addrmap_index_data.previous_cu_index);
20499 /* Return the symbol kind of PSYM. */
20501 static gdb_index_symbol_kind
20502 symbol_kind (struct partial_symbol *psym)
20504 domain_enum domain = PSYMBOL_DOMAIN (psym);
20505 enum address_class aclass = PSYMBOL_CLASS (psym);
20513 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
20515 return GDB_INDEX_SYMBOL_KIND_TYPE;
20517 case LOC_CONST_BYTES:
20518 case LOC_OPTIMIZED_OUT:
20520 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20522 /* Note: It's currently impossible to recognize psyms as enum values
20523 short of reading the type info. For now punt. */
20524 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20526 /* There are other LOC_FOO values that one might want to classify
20527 as variables, but dwarf2read.c doesn't currently use them. */
20528 return GDB_INDEX_SYMBOL_KIND_OTHER;
20530 case STRUCT_DOMAIN:
20531 return GDB_INDEX_SYMBOL_KIND_TYPE;
20533 return GDB_INDEX_SYMBOL_KIND_OTHER;
20537 /* Add a list of partial symbols to SYMTAB. */
20540 write_psymbols (struct mapped_symtab *symtab,
20542 struct partial_symbol **psymp,
20544 offset_type cu_index,
20547 for (; count-- > 0; ++psymp)
20549 struct partial_symbol *psym = *psymp;
20552 if (SYMBOL_LANGUAGE (psym) == language_ada)
20553 error (_("Ada is not currently supported by the index"));
20555 /* Only add a given psymbol once. */
20556 slot = htab_find_slot (psyms_seen, psym, INSERT);
20559 gdb_index_symbol_kind kind = symbol_kind (psym);
20562 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
20563 is_static, kind, cu_index);
20568 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
20569 exception if there is an error. */
20572 write_obstack (FILE *file, struct obstack *obstack)
20574 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
20576 != obstack_object_size (obstack))
20577 error (_("couldn't data write to file"));
20580 /* Unlink a file if the argument is not NULL. */
20583 unlink_if_set (void *p)
20585 char **filename = p;
20587 unlink (*filename);
20590 /* A helper struct used when iterating over debug_types. */
20591 struct signatured_type_index_data
20593 struct objfile *objfile;
20594 struct mapped_symtab *symtab;
20595 struct obstack *types_list;
20600 /* A helper function that writes a single signatured_type to an
20604 write_one_signatured_type (void **slot, void *d)
20606 struct signatured_type_index_data *info = d;
20607 struct signatured_type *entry = (struct signatured_type *) *slot;
20608 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
20611 write_psymbols (info->symtab,
20613 info->objfile->global_psymbols.list
20614 + psymtab->globals_offset,
20615 psymtab->n_global_syms, info->cu_index,
20617 write_psymbols (info->symtab,
20619 info->objfile->static_psymbols.list
20620 + psymtab->statics_offset,
20621 psymtab->n_static_syms, info->cu_index,
20624 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20625 entry->per_cu.offset.sect_off);
20626 obstack_grow (info->types_list, val, 8);
20627 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20628 entry->type_offset_in_tu.cu_off);
20629 obstack_grow (info->types_list, val, 8);
20630 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
20631 obstack_grow (info->types_list, val, 8);
20638 /* Recurse into all "included" dependencies and write their symbols as
20639 if they appeared in this psymtab. */
20642 recursively_write_psymbols (struct objfile *objfile,
20643 struct partial_symtab *psymtab,
20644 struct mapped_symtab *symtab,
20646 offset_type cu_index)
20650 for (i = 0; i < psymtab->number_of_dependencies; ++i)
20651 if (psymtab->dependencies[i]->user != NULL)
20652 recursively_write_psymbols (objfile, psymtab->dependencies[i],
20653 symtab, psyms_seen, cu_index);
20655 write_psymbols (symtab,
20657 objfile->global_psymbols.list + psymtab->globals_offset,
20658 psymtab->n_global_syms, cu_index,
20660 write_psymbols (symtab,
20662 objfile->static_psymbols.list + psymtab->statics_offset,
20663 psymtab->n_static_syms, cu_index,
20667 /* Create an index file for OBJFILE in the directory DIR. */
20670 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
20672 struct cleanup *cleanup;
20673 char *filename, *cleanup_filename;
20674 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
20675 struct obstack cu_list, types_cu_list;
20678 struct mapped_symtab *symtab;
20679 offset_type val, size_of_contents, total_len;
20682 htab_t cu_index_htab;
20683 struct psymtab_cu_index_map *psymtab_cu_index_map;
20685 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
20688 if (dwarf2_per_objfile->using_index)
20689 error (_("Cannot use an index to create the index"));
20691 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
20692 error (_("Cannot make an index when the file has multiple .debug_types sections"));
20694 if (stat (objfile->name, &st) < 0)
20695 perror_with_name (objfile->name);
20697 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
20698 INDEX_SUFFIX, (char *) NULL);
20699 cleanup = make_cleanup (xfree, filename);
20701 out_file = fopen (filename, "wb");
20703 error (_("Can't open `%s' for writing"), filename);
20705 cleanup_filename = filename;
20706 make_cleanup (unlink_if_set, &cleanup_filename);
20708 symtab = create_mapped_symtab ();
20709 make_cleanup (cleanup_mapped_symtab, symtab);
20711 obstack_init (&addr_obstack);
20712 make_cleanup_obstack_free (&addr_obstack);
20714 obstack_init (&cu_list);
20715 make_cleanup_obstack_free (&cu_list);
20717 obstack_init (&types_cu_list);
20718 make_cleanup_obstack_free (&types_cu_list);
20720 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
20721 NULL, xcalloc, xfree);
20722 make_cleanup_htab_delete (psyms_seen);
20724 /* While we're scanning CU's create a table that maps a psymtab pointer
20725 (which is what addrmap records) to its index (which is what is recorded
20726 in the index file). This will later be needed to write the address
20728 cu_index_htab = htab_create_alloc (100,
20729 hash_psymtab_cu_index,
20730 eq_psymtab_cu_index,
20731 NULL, xcalloc, xfree);
20732 make_cleanup_htab_delete (cu_index_htab);
20733 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
20734 xmalloc (sizeof (struct psymtab_cu_index_map)
20735 * dwarf2_per_objfile->n_comp_units);
20736 make_cleanup (xfree, psymtab_cu_index_map);
20738 /* The CU list is already sorted, so we don't need to do additional
20739 work here. Also, the debug_types entries do not appear in
20740 all_comp_units, but only in their own hash table. */
20741 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
20743 struct dwarf2_per_cu_data *per_cu
20744 = dwarf2_per_objfile->all_comp_units[i];
20745 struct partial_symtab *psymtab = per_cu->v.psymtab;
20747 struct psymtab_cu_index_map *map;
20750 if (psymtab->user == NULL)
20751 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
20753 map = &psymtab_cu_index_map[i];
20754 map->psymtab = psymtab;
20756 slot = htab_find_slot (cu_index_htab, map, INSERT);
20757 gdb_assert (slot != NULL);
20758 gdb_assert (*slot == NULL);
20761 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20762 per_cu->offset.sect_off);
20763 obstack_grow (&cu_list, val, 8);
20764 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
20765 obstack_grow (&cu_list, val, 8);
20768 /* Dump the address map. */
20769 write_address_map (objfile, &addr_obstack, cu_index_htab);
20771 /* Write out the .debug_type entries, if any. */
20772 if (dwarf2_per_objfile->signatured_types)
20774 struct signatured_type_index_data sig_data;
20776 sig_data.objfile = objfile;
20777 sig_data.symtab = symtab;
20778 sig_data.types_list = &types_cu_list;
20779 sig_data.psyms_seen = psyms_seen;
20780 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
20781 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
20782 write_one_signatured_type, &sig_data);
20785 /* Now that we've processed all symbols we can shrink their cu_indices
20787 uniquify_cu_indices (symtab);
20789 obstack_init (&constant_pool);
20790 make_cleanup_obstack_free (&constant_pool);
20791 obstack_init (&symtab_obstack);
20792 make_cleanup_obstack_free (&symtab_obstack);
20793 write_hash_table (symtab, &symtab_obstack, &constant_pool);
20795 obstack_init (&contents);
20796 make_cleanup_obstack_free (&contents);
20797 size_of_contents = 6 * sizeof (offset_type);
20798 total_len = size_of_contents;
20800 /* The version number. */
20801 val = MAYBE_SWAP (8);
20802 obstack_grow (&contents, &val, sizeof (val));
20804 /* The offset of the CU list from the start of the file. */
20805 val = MAYBE_SWAP (total_len);
20806 obstack_grow (&contents, &val, sizeof (val));
20807 total_len += obstack_object_size (&cu_list);
20809 /* The offset of the types CU list from the start of the file. */
20810 val = MAYBE_SWAP (total_len);
20811 obstack_grow (&contents, &val, sizeof (val));
20812 total_len += obstack_object_size (&types_cu_list);
20814 /* The offset of the address table from the start of the file. */
20815 val = MAYBE_SWAP (total_len);
20816 obstack_grow (&contents, &val, sizeof (val));
20817 total_len += obstack_object_size (&addr_obstack);
20819 /* The offset of the symbol table from the start of the file. */
20820 val = MAYBE_SWAP (total_len);
20821 obstack_grow (&contents, &val, sizeof (val));
20822 total_len += obstack_object_size (&symtab_obstack);
20824 /* The offset of the constant pool from the start of the file. */
20825 val = MAYBE_SWAP (total_len);
20826 obstack_grow (&contents, &val, sizeof (val));
20827 total_len += obstack_object_size (&constant_pool);
20829 gdb_assert (obstack_object_size (&contents) == size_of_contents);
20831 write_obstack (out_file, &contents);
20832 write_obstack (out_file, &cu_list);
20833 write_obstack (out_file, &types_cu_list);
20834 write_obstack (out_file, &addr_obstack);
20835 write_obstack (out_file, &symtab_obstack);
20836 write_obstack (out_file, &constant_pool);
20840 /* We want to keep the file, so we set cleanup_filename to NULL
20841 here. See unlink_if_set. */
20842 cleanup_filename = NULL;
20844 do_cleanups (cleanup);
20847 /* Implementation of the `save gdb-index' command.
20849 Note that the file format used by this command is documented in the
20850 GDB manual. Any changes here must be documented there. */
20853 save_gdb_index_command (char *arg, int from_tty)
20855 struct objfile *objfile;
20858 error (_("usage: save gdb-index DIRECTORY"));
20860 ALL_OBJFILES (objfile)
20864 /* If the objfile does not correspond to an actual file, skip it. */
20865 if (stat (objfile->name, &st) < 0)
20868 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20869 if (dwarf2_per_objfile)
20871 volatile struct gdb_exception except;
20873 TRY_CATCH (except, RETURN_MASK_ERROR)
20875 write_psymtabs_to_index (objfile, arg);
20877 if (except.reason < 0)
20878 exception_fprintf (gdb_stderr, except,
20879 _("Error while writing index for `%s': "),
20887 int dwarf2_always_disassemble;
20890 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
20891 struct cmd_list_element *c, const char *value)
20893 fprintf_filtered (file,
20894 _("Whether to always disassemble "
20895 "DWARF expressions is %s.\n"),
20900 show_check_physname (struct ui_file *file, int from_tty,
20901 struct cmd_list_element *c, const char *value)
20903 fprintf_filtered (file,
20904 _("Whether to check \"physname\" is %s.\n"),
20908 void _initialize_dwarf2_read (void);
20911 _initialize_dwarf2_read (void)
20913 struct cmd_list_element *c;
20915 dwarf2_objfile_data_key
20916 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
20918 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
20919 Set DWARF 2 specific variables.\n\
20920 Configure DWARF 2 variables such as the cache size"),
20921 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
20922 0/*allow-unknown*/, &maintenance_set_cmdlist);
20924 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
20925 Show DWARF 2 specific variables\n\
20926 Show DWARF 2 variables such as the cache size"),
20927 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
20928 0/*allow-unknown*/, &maintenance_show_cmdlist);
20930 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
20931 &dwarf2_max_cache_age, _("\
20932 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
20933 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
20934 A higher limit means that cached compilation units will be stored\n\
20935 in memory longer, and more total memory will be used. Zero disables\n\
20936 caching, which can slow down startup."),
20938 show_dwarf2_max_cache_age,
20939 &set_dwarf2_cmdlist,
20940 &show_dwarf2_cmdlist);
20942 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
20943 &dwarf2_always_disassemble, _("\
20944 Set whether `info address' always disassembles DWARF expressions."), _("\
20945 Show whether `info address' always disassembles DWARF expressions."), _("\
20946 When enabled, DWARF expressions are always printed in an assembly-like\n\
20947 syntax. When disabled, expressions will be printed in a more\n\
20948 conversational style, when possible."),
20950 show_dwarf2_always_disassemble,
20951 &set_dwarf2_cmdlist,
20952 &show_dwarf2_cmdlist);
20954 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
20955 Set debugging of the dwarf2 reader."), _("\
20956 Show debugging of the dwarf2 reader."), _("\
20957 When enabled, debugging messages are printed during dwarf2 reading\n\
20958 and symtab expansion."),
20961 &setdebuglist, &showdebuglist);
20963 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
20964 Set debugging of the dwarf2 DIE reader."), _("\
20965 Show debugging of the dwarf2 DIE reader."), _("\
20966 When enabled (non-zero), DIEs are dumped after they are read in.\n\
20967 The value is the maximum depth to print."),
20970 &setdebuglist, &showdebuglist);
20972 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
20973 Set cross-checking of \"physname\" code against demangler."), _("\
20974 Show cross-checking of \"physname\" code against demangler."), _("\
20975 When enabled, GDB's internal \"physname\" code is checked against\n\
20977 NULL, show_check_physname,
20978 &setdebuglist, &showdebuglist);
20980 add_setshow_boolean_cmd ("use-deprecated-index-sections",
20981 no_class, &use_deprecated_index_sections, _("\
20982 Set whether to use deprecated gdb_index sections."), _("\
20983 Show whether to use deprecated gdb_index sections."), _("\
20984 When enabled, deprecated .gdb_index sections are used anyway.\n\
20985 Normally they are ignored either because of a missing feature or\n\
20986 performance issue.\n\
20987 Warning: This option must be enabled before gdb reads the file."),
20990 &setlist, &showlist);
20992 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
20994 Save a gdb-index file.\n\
20995 Usage: save gdb-index DIRECTORY"),
20997 set_cmd_completer (c, filename_completer);
20999 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
21000 &dwarf2_locexpr_funcs);
21001 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
21002 &dwarf2_loclist_funcs);
21004 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
21005 &dwarf2_block_frame_base_locexpr_funcs);
21006 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
21007 &dwarf2_block_frame_base_loclist_funcs);