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 N.B.: This is the first member so that it's easy to convert pointers
606 struct dwarf2_per_cu_data per_cu;
608 /* The type's signature. */
611 /* Offset in the TU of the type's DIE, as read from the TU header.
612 If this TU is a DWO stub and the definition lives in a DWO file
613 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
614 cu_offset type_offset_in_tu;
616 /* Offset in the section of the type's DIE.
617 If the definition lives in a DWO file, this is the offset in the
618 .debug_types.dwo section.
619 The value is zero until the actual value is known.
620 Zero is otherwise not a valid section offset. */
621 sect_offset type_offset_in_section;
623 /* Type units are grouped by their DW_AT_stmt_list entry so that they
624 can share them. This points to the containing symtab. */
625 struct type_unit_group *type_unit_group;
628 typedef struct signatured_type *sig_type_ptr;
629 DEF_VEC_P (sig_type_ptr);
631 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
632 This includes type_unit_group and quick_file_names. */
634 struct stmt_list_hash
636 /* The DWO unit this table is from or NULL if there is none. */
637 struct dwo_unit *dwo_unit;
639 /* Offset in .debug_line or .debug_line.dwo. */
640 sect_offset line_offset;
643 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
644 an object of this type. */
646 struct type_unit_group
648 /* dwarf2read.c's main "handle" on a TU symtab.
649 To simplify things we create an artificial CU that "includes" all the
650 type units using this stmt_list so that the rest of the code still has
651 a "per_cu" handle on the symtab.
652 This PER_CU is recognized by having no section. */
653 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
654 struct dwarf2_per_cu_data per_cu;
656 /* The TUs that share this DW_AT_stmt_list entry.
657 This is added to while parsing type units to build partial symtabs,
658 and is deleted afterwards and not used again. */
659 VEC (sig_type_ptr) *tus;
661 /* The primary symtab.
662 Type units in a group needn't all be defined in the same source file,
663 so we create an essentially anonymous symtab as the primary symtab. */
664 struct symtab *primary_symtab;
666 /* The data used to construct the hash key. */
667 struct stmt_list_hash hash;
669 /* The number of symtabs from the line header.
670 The value here must match line_header.num_file_names. */
671 unsigned int num_symtabs;
673 /* The symbol tables for this TU (obtained from the files listed in
675 WARNING: The order of entries here must match the order of entries
676 in the line header. After the first TU using this type_unit_group, the
677 line header for the subsequent TUs is recreated from this. This is done
678 because we need to use the same symtabs for each TU using the same
679 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
680 there's no guarantee the line header doesn't have duplicate entries. */
681 struct symtab **symtabs;
684 /* These sections are what may appear in a DWO file. */
688 struct dwarf2_section_info abbrev;
689 struct dwarf2_section_info line;
690 struct dwarf2_section_info loc;
691 struct dwarf2_section_info macinfo;
692 struct dwarf2_section_info macro;
693 struct dwarf2_section_info str;
694 struct dwarf2_section_info str_offsets;
695 /* In the case of a virtual DWO file, these two are unused. */
696 struct dwarf2_section_info info;
697 VEC (dwarf2_section_info_def) *types;
700 /* CUs/TUs in DWP/DWO files. */
704 /* Backlink to the containing struct dwo_file. */
705 struct dwo_file *dwo_file;
707 /* The "id" that distinguishes this CU/TU.
708 .debug_info calls this "dwo_id", .debug_types calls this "signature".
709 Since signatures came first, we stick with it for consistency. */
712 /* The section this CU/TU lives in, in the DWO file. */
713 struct dwarf2_section_info *section;
715 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
719 /* For types, offset in the type's DIE of the type defined by this TU. */
720 cu_offset type_offset_in_tu;
723 /* Data for one DWO file.
724 This includes virtual DWO files that have been packaged into a
729 /* The DW_AT_GNU_dwo_name attribute.
730 For virtual DWO files the name is constructed from the section offsets
731 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
732 from related CU+TUs. */
733 const char *dwo_name;
735 /* The DW_AT_comp_dir attribute. */
736 const char *comp_dir;
738 /* The bfd, when the file is open. Otherwise this is NULL.
739 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
742 /* Section info for this file. */
743 struct dwo_sections sections;
745 /* Table of CUs in the file.
746 Each element is a struct dwo_unit. */
749 /* Table of TUs in the file.
750 Each element is a struct dwo_unit. */
754 /* These sections are what may appear in a DWP file. */
758 struct dwarf2_section_info str;
759 struct dwarf2_section_info cu_index;
760 struct dwarf2_section_info tu_index;
761 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
762 by section number. We don't need to record them here. */
765 /* These sections are what may appear in a virtual DWO file. */
767 struct virtual_dwo_sections
769 struct dwarf2_section_info abbrev;
770 struct dwarf2_section_info line;
771 struct dwarf2_section_info loc;
772 struct dwarf2_section_info macinfo;
773 struct dwarf2_section_info macro;
774 struct dwarf2_section_info str_offsets;
775 /* Each DWP hash table entry records one CU or one TU.
776 That is recorded here, and copied to dwo_unit.section. */
777 struct dwarf2_section_info info_or_types;
780 /* Contents of DWP hash tables. */
782 struct dwp_hash_table
784 uint32_t nr_units, nr_slots;
785 const gdb_byte *hash_table, *unit_table, *section_pool;
788 /* Data for one DWP file. */
792 /* Name of the file. */
795 /* The bfd, when the file is open. Otherwise this is NULL. */
798 /* Section info for this file. */
799 struct dwp_sections sections;
801 /* Table of CUs in the file. */
802 const struct dwp_hash_table *cus;
804 /* Table of TUs in the file. */
805 const struct dwp_hash_table *tus;
807 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
810 /* Table to map ELF section numbers to their sections. */
811 unsigned int num_sections;
812 asection **elf_sections;
815 /* This represents a '.dwz' file. */
819 /* A dwz file can only contain a few sections. */
820 struct dwarf2_section_info abbrev;
821 struct dwarf2_section_info info;
822 struct dwarf2_section_info str;
823 struct dwarf2_section_info line;
824 struct dwarf2_section_info macro;
825 struct dwarf2_section_info gdb_index;
831 /* Struct used to pass misc. parameters to read_die_and_children, et
832 al. which are used for both .debug_info and .debug_types dies.
833 All parameters here are unchanging for the life of the call. This
834 struct exists to abstract away the constant parameters of die reading. */
836 struct die_reader_specs
838 /* die_section->asection->owner. */
841 /* The CU of the DIE we are parsing. */
842 struct dwarf2_cu *cu;
844 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
845 struct dwo_file *dwo_file;
847 /* The section the die comes from.
848 This is either .debug_info or .debug_types, or the .dwo variants. */
849 struct dwarf2_section_info *die_section;
851 /* die_section->buffer. */
852 const gdb_byte *buffer;
854 /* The end of the buffer. */
855 const gdb_byte *buffer_end;
858 /* Type of function passed to init_cutu_and_read_dies, et.al. */
859 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
860 const gdb_byte *info_ptr,
861 struct die_info *comp_unit_die,
865 /* The line number information for a compilation unit (found in the
866 .debug_line section) begins with a "statement program header",
867 which contains the following information. */
870 unsigned int total_length;
871 unsigned short version;
872 unsigned int header_length;
873 unsigned char minimum_instruction_length;
874 unsigned char maximum_ops_per_instruction;
875 unsigned char default_is_stmt;
877 unsigned char line_range;
878 unsigned char opcode_base;
880 /* standard_opcode_lengths[i] is the number of operands for the
881 standard opcode whose value is i. This means that
882 standard_opcode_lengths[0] is unused, and the last meaningful
883 element is standard_opcode_lengths[opcode_base - 1]. */
884 unsigned char *standard_opcode_lengths;
886 /* The include_directories table. NOTE! These strings are not
887 allocated with xmalloc; instead, they are pointers into
888 debug_line_buffer. If you try to free them, `free' will get
890 unsigned int num_include_dirs, include_dirs_size;
891 const char **include_dirs;
893 /* The file_names table. NOTE! These strings are not allocated
894 with xmalloc; instead, they are pointers into debug_line_buffer.
895 Don't try to free them directly. */
896 unsigned int num_file_names, file_names_size;
900 unsigned int dir_index;
901 unsigned int mod_time;
903 int included_p; /* Non-zero if referenced by the Line Number Program. */
904 struct symtab *symtab; /* The associated symbol table, if any. */
907 /* The start and end of the statement program following this
908 header. These point into dwarf2_per_objfile->line_buffer. */
909 const gdb_byte *statement_program_start, *statement_program_end;
912 /* When we construct a partial symbol table entry we only
913 need this much information. */
914 struct partial_die_info
916 /* Offset of this DIE. */
919 /* DWARF-2 tag for this DIE. */
920 ENUM_BITFIELD(dwarf_tag) tag : 16;
922 /* Assorted flags describing the data found in this DIE. */
923 unsigned int has_children : 1;
924 unsigned int is_external : 1;
925 unsigned int is_declaration : 1;
926 unsigned int has_type : 1;
927 unsigned int has_specification : 1;
928 unsigned int has_pc_info : 1;
929 unsigned int may_be_inlined : 1;
931 /* Flag set if the SCOPE field of this structure has been
933 unsigned int scope_set : 1;
935 /* Flag set if the DIE has a byte_size attribute. */
936 unsigned int has_byte_size : 1;
938 /* Flag set if any of the DIE's children are template arguments. */
939 unsigned int has_template_arguments : 1;
941 /* Flag set if fixup_partial_die has been called on this die. */
942 unsigned int fixup_called : 1;
944 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
945 unsigned int is_dwz : 1;
947 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
948 unsigned int spec_is_dwz : 1;
950 /* The name of this DIE. Normally the value of DW_AT_name, but
951 sometimes a default name for unnamed DIEs. */
954 /* The linkage name, if present. */
955 const char *linkage_name;
957 /* The scope to prepend to our children. This is generally
958 allocated on the comp_unit_obstack, so will disappear
959 when this compilation unit leaves the cache. */
962 /* Some data associated with the partial DIE. The tag determines
963 which field is live. */
966 /* The location description associated with this DIE, if any. */
967 struct dwarf_block *locdesc;
968 /* The offset of an import, for DW_TAG_imported_unit. */
972 /* If HAS_PC_INFO, the PC range associated with this DIE. */
976 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
977 DW_AT_sibling, if any. */
978 /* NOTE: This member isn't strictly necessary, read_partial_die could
979 return DW_AT_sibling values to its caller load_partial_dies. */
980 const gdb_byte *sibling;
982 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
983 DW_AT_specification (or DW_AT_abstract_origin or
985 sect_offset spec_offset;
987 /* Pointers to this DIE's parent, first child, and next sibling,
989 struct partial_die_info *die_parent, *die_child, *die_sibling;
992 /* This data structure holds the information of an abbrev. */
995 unsigned int number; /* number identifying abbrev */
996 enum dwarf_tag tag; /* dwarf tag */
997 unsigned short has_children; /* boolean */
998 unsigned short num_attrs; /* number of attributes */
999 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1000 struct abbrev_info *next; /* next in chain */
1005 ENUM_BITFIELD(dwarf_attribute) name : 16;
1006 ENUM_BITFIELD(dwarf_form) form : 16;
1009 /* Size of abbrev_table.abbrev_hash_table. */
1010 #define ABBREV_HASH_SIZE 121
1012 /* Top level data structure to contain an abbreviation table. */
1016 /* Where the abbrev table came from.
1017 This is used as a sanity check when the table is used. */
1020 /* Storage for the abbrev table. */
1021 struct obstack abbrev_obstack;
1023 /* Hash table of abbrevs.
1024 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1025 It could be statically allocated, but the previous code didn't so we
1027 struct abbrev_info **abbrevs;
1030 /* Attributes have a name and a value. */
1033 ENUM_BITFIELD(dwarf_attribute) name : 16;
1034 ENUM_BITFIELD(dwarf_form) form : 15;
1036 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1037 field should be in u.str (existing only for DW_STRING) but it is kept
1038 here for better struct attribute alignment. */
1039 unsigned int string_is_canonical : 1;
1044 struct dwarf_block *blk;
1048 struct signatured_type *signatured_type;
1053 /* This data structure holds a complete die structure. */
1056 /* DWARF-2 tag for this DIE. */
1057 ENUM_BITFIELD(dwarf_tag) tag : 16;
1059 /* Number of attributes */
1060 unsigned char num_attrs;
1062 /* True if we're presently building the full type name for the
1063 type derived from this DIE. */
1064 unsigned char building_fullname : 1;
1067 unsigned int abbrev;
1069 /* Offset in .debug_info or .debug_types section. */
1072 /* The dies in a compilation unit form an n-ary tree. PARENT
1073 points to this die's parent; CHILD points to the first child of
1074 this node; and all the children of a given node are chained
1075 together via their SIBLING fields. */
1076 struct die_info *child; /* Its first child, if any. */
1077 struct die_info *sibling; /* Its next sibling, if any. */
1078 struct die_info *parent; /* Its parent, if any. */
1080 /* An array of attributes, with NUM_ATTRS elements. There may be
1081 zero, but it's not common and zero-sized arrays are not
1082 sufficiently portable C. */
1083 struct attribute attrs[1];
1086 /* Get at parts of an attribute structure. */
1088 #define DW_STRING(attr) ((attr)->u.str)
1089 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1090 #define DW_UNSND(attr) ((attr)->u.unsnd)
1091 #define DW_BLOCK(attr) ((attr)->u.blk)
1092 #define DW_SND(attr) ((attr)->u.snd)
1093 #define DW_ADDR(attr) ((attr)->u.addr)
1094 #define DW_SIGNATURED_TYPE(attr) ((attr)->u.signatured_type)
1096 /* Blocks are a bunch of untyped bytes. */
1101 /* Valid only if SIZE is not zero. */
1102 const gdb_byte *data;
1105 #ifndef ATTR_ALLOC_CHUNK
1106 #define ATTR_ALLOC_CHUNK 4
1109 /* Allocate fields for structs, unions and enums in this size. */
1110 #ifndef DW_FIELD_ALLOC_CHUNK
1111 #define DW_FIELD_ALLOC_CHUNK 4
1114 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1115 but this would require a corresponding change in unpack_field_as_long
1117 static int bits_per_byte = 8;
1119 /* The routines that read and process dies for a C struct or C++ class
1120 pass lists of data member fields and lists of member function fields
1121 in an instance of a field_info structure, as defined below. */
1124 /* List of data member and baseclasses fields. */
1127 struct nextfield *next;
1132 *fields, *baseclasses;
1134 /* Number of fields (including baseclasses). */
1137 /* Number of baseclasses. */
1140 /* Set if the accesibility of one of the fields is not public. */
1141 int non_public_fields;
1143 /* Member function fields array, entries are allocated in the order they
1144 are encountered in the object file. */
1147 struct nextfnfield *next;
1148 struct fn_field fnfield;
1152 /* Member function fieldlist array, contains name of possibly overloaded
1153 member function, number of overloaded member functions and a pointer
1154 to the head of the member function field chain. */
1159 struct nextfnfield *head;
1163 /* Number of entries in the fnfieldlists array. */
1166 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1167 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1168 struct typedef_field_list
1170 struct typedef_field field;
1171 struct typedef_field_list *next;
1173 *typedef_field_list;
1174 unsigned typedef_field_list_count;
1177 /* One item on the queue of compilation units to read in full symbols
1179 struct dwarf2_queue_item
1181 struct dwarf2_per_cu_data *per_cu;
1182 enum language pretend_language;
1183 struct dwarf2_queue_item *next;
1186 /* The current queue. */
1187 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1189 /* Loaded secondary compilation units are kept in memory until they
1190 have not been referenced for the processing of this many
1191 compilation units. Set this to zero to disable caching. Cache
1192 sizes of up to at least twenty will improve startup time for
1193 typical inter-CU-reference binaries, at an obvious memory cost. */
1194 static int dwarf2_max_cache_age = 5;
1196 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1197 struct cmd_list_element *c, const char *value)
1199 fprintf_filtered (file, _("The upper bound on the age of cached "
1200 "dwarf2 compilation units is %s.\n"),
1205 /* Various complaints about symbol reading that don't abort the process. */
1208 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1210 complaint (&symfile_complaints,
1211 _("statement list doesn't fit in .debug_line section"));
1215 dwarf2_debug_line_missing_file_complaint (void)
1217 complaint (&symfile_complaints,
1218 _(".debug_line section has line data without a file"));
1222 dwarf2_debug_line_missing_end_sequence_complaint (void)
1224 complaint (&symfile_complaints,
1225 _(".debug_line section has line "
1226 "program sequence without an end"));
1230 dwarf2_complex_location_expr_complaint (void)
1232 complaint (&symfile_complaints, _("location expression too complex"));
1236 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1239 complaint (&symfile_complaints,
1240 _("const value length mismatch for '%s', got %d, expected %d"),
1245 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1247 complaint (&symfile_complaints,
1248 _("debug info runs off end of %s section"
1250 section->asection->name,
1251 bfd_get_filename (section->asection->owner));
1255 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1257 complaint (&symfile_complaints,
1258 _("macro debug info contains a "
1259 "malformed macro definition:\n`%s'"),
1264 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1266 complaint (&symfile_complaints,
1267 _("invalid attribute class or form for '%s' in '%s'"),
1271 /* local function prototypes */
1273 static void dwarf2_locate_sections (bfd *, asection *, void *);
1275 static void dwarf2_find_base_address (struct die_info *die,
1276 struct dwarf2_cu *cu);
1278 static struct partial_symtab *create_partial_symtab
1279 (struct dwarf2_per_cu_data *per_cu, const char *name);
1281 static void dwarf2_build_psymtabs_hard (struct objfile *);
1283 static void scan_partial_symbols (struct partial_die_info *,
1284 CORE_ADDR *, CORE_ADDR *,
1285 int, struct dwarf2_cu *);
1287 static void add_partial_symbol (struct partial_die_info *,
1288 struct dwarf2_cu *);
1290 static void add_partial_namespace (struct partial_die_info *pdi,
1291 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1292 int need_pc, struct dwarf2_cu *cu);
1294 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1295 CORE_ADDR *highpc, int need_pc,
1296 struct dwarf2_cu *cu);
1298 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1299 struct dwarf2_cu *cu);
1301 static void add_partial_subprogram (struct partial_die_info *pdi,
1302 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1303 int need_pc, struct dwarf2_cu *cu);
1305 static void dwarf2_read_symtab (struct partial_symtab *,
1308 static void psymtab_to_symtab_1 (struct partial_symtab *);
1310 static struct abbrev_info *abbrev_table_lookup_abbrev
1311 (const struct abbrev_table *, unsigned int);
1313 static struct abbrev_table *abbrev_table_read_table
1314 (struct dwarf2_section_info *, sect_offset);
1316 static void abbrev_table_free (struct abbrev_table *);
1318 static void abbrev_table_free_cleanup (void *);
1320 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1321 struct dwarf2_section_info *);
1323 static void dwarf2_free_abbrev_table (void *);
1325 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1327 static struct partial_die_info *load_partial_dies
1328 (const struct die_reader_specs *, const gdb_byte *, int);
1330 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1331 struct partial_die_info *,
1332 struct abbrev_info *,
1336 static struct partial_die_info *find_partial_die (sect_offset, int,
1337 struct dwarf2_cu *);
1339 static void fixup_partial_die (struct partial_die_info *,
1340 struct dwarf2_cu *);
1342 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1343 struct attribute *, struct attr_abbrev *,
1346 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1348 static int read_1_signed_byte (bfd *, const gdb_byte *);
1350 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1352 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1354 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1356 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1359 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1361 static LONGEST read_checked_initial_length_and_offset
1362 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1363 unsigned int *, unsigned int *);
1365 static LONGEST read_offset (bfd *, const gdb_byte *,
1366 const struct comp_unit_head *,
1369 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1371 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1374 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1376 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1378 static const char *read_indirect_string (bfd *, const gdb_byte *,
1379 const struct comp_unit_head *,
1382 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1384 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1386 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1388 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1392 static const char *read_str_index (const struct die_reader_specs *reader,
1393 struct dwarf2_cu *cu, ULONGEST str_index);
1395 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1397 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1398 struct dwarf2_cu *);
1400 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1403 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1404 struct dwarf2_cu *cu);
1406 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1408 static struct die_info *die_specification (struct die_info *die,
1409 struct dwarf2_cu **);
1411 static void free_line_header (struct line_header *lh);
1413 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1414 struct dwarf2_cu *cu);
1416 static void dwarf_decode_lines (struct line_header *, const char *,
1417 struct dwarf2_cu *, struct partial_symtab *,
1420 static void dwarf2_start_subfile (const char *, const char *, const char *);
1422 static void dwarf2_start_symtab (struct dwarf2_cu *,
1423 const char *, const char *, CORE_ADDR);
1425 static struct symbol *new_symbol (struct die_info *, struct type *,
1426 struct dwarf2_cu *);
1428 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1429 struct dwarf2_cu *, struct symbol *);
1431 static void dwarf2_const_value (struct attribute *, struct symbol *,
1432 struct dwarf2_cu *);
1434 static void dwarf2_const_value_attr (struct attribute *attr,
1437 struct obstack *obstack,
1438 struct dwarf2_cu *cu, LONGEST *value,
1439 const gdb_byte **bytes,
1440 struct dwarf2_locexpr_baton **baton);
1442 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1444 static int need_gnat_info (struct dwarf2_cu *);
1446 static struct type *die_descriptive_type (struct die_info *,
1447 struct dwarf2_cu *);
1449 static void set_descriptive_type (struct type *, struct die_info *,
1450 struct dwarf2_cu *);
1452 static struct type *die_containing_type (struct die_info *,
1453 struct dwarf2_cu *);
1455 static struct type *lookup_die_type (struct die_info *, struct attribute *,
1456 struct dwarf2_cu *);
1458 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1460 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1462 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1464 static char *typename_concat (struct obstack *obs, const char *prefix,
1465 const char *suffix, int physname,
1466 struct dwarf2_cu *cu);
1468 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1470 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1472 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1474 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1476 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1478 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1479 struct dwarf2_cu *, struct partial_symtab *);
1481 static int dwarf2_get_pc_bounds (struct die_info *,
1482 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1483 struct partial_symtab *);
1485 static void get_scope_pc_bounds (struct die_info *,
1486 CORE_ADDR *, CORE_ADDR *,
1487 struct dwarf2_cu *);
1489 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1490 CORE_ADDR, struct dwarf2_cu *);
1492 static void dwarf2_add_field (struct field_info *, struct die_info *,
1493 struct dwarf2_cu *);
1495 static void dwarf2_attach_fields_to_type (struct field_info *,
1496 struct type *, struct dwarf2_cu *);
1498 static void dwarf2_add_member_fn (struct field_info *,
1499 struct die_info *, struct type *,
1500 struct dwarf2_cu *);
1502 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1504 struct dwarf2_cu *);
1506 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1508 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1510 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1512 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1514 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1516 static struct type *read_module_type (struct die_info *die,
1517 struct dwarf2_cu *cu);
1519 static const char *namespace_name (struct die_info *die,
1520 int *is_anonymous, struct dwarf2_cu *);
1522 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1524 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1526 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1527 struct dwarf2_cu *);
1529 static struct die_info *read_die_and_siblings_1
1530 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1533 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1534 const gdb_byte *info_ptr,
1535 const gdb_byte **new_info_ptr,
1536 struct die_info *parent);
1538 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1539 struct die_info **, const gdb_byte *,
1542 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1543 struct die_info **, const gdb_byte *,
1546 static void process_die (struct die_info *, struct dwarf2_cu *);
1548 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1551 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1553 static const char *dwarf2_full_name (const char *name,
1554 struct die_info *die,
1555 struct dwarf2_cu *cu);
1557 static const char *dwarf2_physname (const char *name, struct die_info *die,
1558 struct dwarf2_cu *cu);
1560 static struct die_info *dwarf2_extension (struct die_info *die,
1561 struct dwarf2_cu **);
1563 static const char *dwarf_tag_name (unsigned int);
1565 static const char *dwarf_attr_name (unsigned int);
1567 static const char *dwarf_form_name (unsigned int);
1569 static char *dwarf_bool_name (unsigned int);
1571 static const char *dwarf_type_encoding_name (unsigned int);
1573 static struct die_info *sibling_die (struct die_info *);
1575 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1577 static void dump_die_for_error (struct die_info *);
1579 static void dump_die_1 (struct ui_file *, int level, int max_level,
1582 /*static*/ void dump_die (struct die_info *, int max_level);
1584 static void store_in_ref_table (struct die_info *,
1585 struct dwarf2_cu *);
1587 static int is_ref_attr (struct attribute *);
1589 static sect_offset dwarf2_get_ref_die_offset (struct attribute *);
1591 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int);
1593 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1595 struct dwarf2_cu **);
1597 static struct die_info *follow_die_ref (struct die_info *,
1599 struct dwarf2_cu **);
1601 static struct die_info *follow_die_sig (struct die_info *,
1603 struct dwarf2_cu **);
1605 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1607 static void read_signatured_type (struct signatured_type *);
1609 static struct type_unit_group *get_type_unit_group
1610 (struct dwarf2_cu *, struct attribute *);
1612 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1614 /* memory allocation interface */
1616 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1618 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1620 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1623 static int attr_form_is_block (struct attribute *);
1625 static int attr_form_is_section_offset (struct attribute *);
1627 static int attr_form_is_constant (struct attribute *);
1629 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1630 struct dwarf2_loclist_baton *baton,
1631 struct attribute *attr);
1633 static void dwarf2_symbol_mark_computed (struct attribute *attr,
1635 struct dwarf2_cu *cu,
1638 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1639 const gdb_byte *info_ptr,
1640 struct abbrev_info *abbrev);
1642 static void free_stack_comp_unit (void *);
1644 static hashval_t partial_die_hash (const void *item);
1646 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1648 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1649 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1651 static void init_one_comp_unit (struct dwarf2_cu *cu,
1652 struct dwarf2_per_cu_data *per_cu);
1654 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1655 struct die_info *comp_unit_die,
1656 enum language pretend_language);
1658 static void free_heap_comp_unit (void *);
1660 static void free_cached_comp_units (void *);
1662 static void age_cached_comp_units (void);
1664 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1666 static struct type *set_die_type (struct die_info *, struct type *,
1667 struct dwarf2_cu *);
1669 static void create_all_comp_units (struct objfile *);
1671 static int create_all_type_units (struct objfile *);
1673 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1676 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1679 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1682 static void dwarf2_add_dependence (struct dwarf2_cu *,
1683 struct dwarf2_per_cu_data *);
1685 static void dwarf2_mark (struct dwarf2_cu *);
1687 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1689 static struct type *get_die_type_at_offset (sect_offset,
1690 struct dwarf2_per_cu_data *per_cu);
1692 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1694 static void dwarf2_release_queue (void *dummy);
1696 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1697 enum language pretend_language);
1699 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
1700 struct dwarf2_per_cu_data *per_cu,
1701 enum language pretend_language);
1703 static void process_queue (void);
1705 static void find_file_and_directory (struct die_info *die,
1706 struct dwarf2_cu *cu,
1707 const char **name, const char **comp_dir);
1709 static char *file_full_name (int file, struct line_header *lh,
1710 const char *comp_dir);
1712 static const gdb_byte *read_and_check_comp_unit_head
1713 (struct comp_unit_head *header,
1714 struct dwarf2_section_info *section,
1715 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1716 int is_debug_types_section);
1718 static void init_cutu_and_read_dies
1719 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1720 int use_existing_cu, int keep,
1721 die_reader_func_ftype *die_reader_func, void *data);
1723 static void init_cutu_and_read_dies_simple
1724 (struct dwarf2_per_cu_data *this_cu,
1725 die_reader_func_ftype *die_reader_func, void *data);
1727 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1729 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1731 static struct dwo_unit *lookup_dwo_comp_unit
1732 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1734 static struct dwo_unit *lookup_dwo_type_unit
1735 (struct signatured_type *, const char *, const char *);
1737 static void free_dwo_file_cleanup (void *);
1739 static void process_cu_includes (void);
1741 static void check_producer (struct dwarf2_cu *cu);
1745 /* Convert VALUE between big- and little-endian. */
1747 byte_swap (offset_type value)
1751 result = (value & 0xff) << 24;
1752 result |= (value & 0xff00) << 8;
1753 result |= (value & 0xff0000) >> 8;
1754 result |= (value & 0xff000000) >> 24;
1758 #define MAYBE_SWAP(V) byte_swap (V)
1761 #define MAYBE_SWAP(V) (V)
1762 #endif /* WORDS_BIGENDIAN */
1764 /* The suffix for an index file. */
1765 #define INDEX_SUFFIX ".gdb-index"
1767 /* Try to locate the sections we need for DWARF 2 debugging
1768 information and return true if we have enough to do something.
1769 NAMES points to the dwarf2 section names, or is NULL if the standard
1770 ELF names are used. */
1773 dwarf2_has_info (struct objfile *objfile,
1774 const struct dwarf2_debug_sections *names)
1776 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1777 if (!dwarf2_per_objfile)
1779 /* Initialize per-objfile state. */
1780 struct dwarf2_per_objfile *data
1781 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1783 memset (data, 0, sizeof (*data));
1784 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1785 dwarf2_per_objfile = data;
1787 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1789 dwarf2_per_objfile->objfile = objfile;
1791 return (dwarf2_per_objfile->info.asection != NULL
1792 && dwarf2_per_objfile->abbrev.asection != NULL);
1795 /* When loading sections, we look either for uncompressed section or for
1796 compressed section names. */
1799 section_is_p (const char *section_name,
1800 const struct dwarf2_section_names *names)
1802 if (names->normal != NULL
1803 && strcmp (section_name, names->normal) == 0)
1805 if (names->compressed != NULL
1806 && strcmp (section_name, names->compressed) == 0)
1811 /* This function is mapped across the sections and remembers the
1812 offset and size of each of the debugging sections we are interested
1816 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1818 const struct dwarf2_debug_sections *names;
1819 flagword aflag = bfd_get_section_flags (abfd, sectp);
1822 names = &dwarf2_elf_names;
1824 names = (const struct dwarf2_debug_sections *) vnames;
1826 if ((aflag & SEC_HAS_CONTENTS) == 0)
1829 else if (section_is_p (sectp->name, &names->info))
1831 dwarf2_per_objfile->info.asection = sectp;
1832 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1834 else if (section_is_p (sectp->name, &names->abbrev))
1836 dwarf2_per_objfile->abbrev.asection = sectp;
1837 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1839 else if (section_is_p (sectp->name, &names->line))
1841 dwarf2_per_objfile->line.asection = sectp;
1842 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1844 else if (section_is_p (sectp->name, &names->loc))
1846 dwarf2_per_objfile->loc.asection = sectp;
1847 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1849 else if (section_is_p (sectp->name, &names->macinfo))
1851 dwarf2_per_objfile->macinfo.asection = sectp;
1852 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1854 else if (section_is_p (sectp->name, &names->macro))
1856 dwarf2_per_objfile->macro.asection = sectp;
1857 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1859 else if (section_is_p (sectp->name, &names->str))
1861 dwarf2_per_objfile->str.asection = sectp;
1862 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1864 else if (section_is_p (sectp->name, &names->addr))
1866 dwarf2_per_objfile->addr.asection = sectp;
1867 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1869 else if (section_is_p (sectp->name, &names->frame))
1871 dwarf2_per_objfile->frame.asection = sectp;
1872 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1874 else if (section_is_p (sectp->name, &names->eh_frame))
1876 dwarf2_per_objfile->eh_frame.asection = sectp;
1877 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1879 else if (section_is_p (sectp->name, &names->ranges))
1881 dwarf2_per_objfile->ranges.asection = sectp;
1882 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1884 else if (section_is_p (sectp->name, &names->types))
1886 struct dwarf2_section_info type_section;
1888 memset (&type_section, 0, sizeof (type_section));
1889 type_section.asection = sectp;
1890 type_section.size = bfd_get_section_size (sectp);
1892 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1895 else if (section_is_p (sectp->name, &names->gdb_index))
1897 dwarf2_per_objfile->gdb_index.asection = sectp;
1898 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1901 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1902 && bfd_section_vma (abfd, sectp) == 0)
1903 dwarf2_per_objfile->has_section_at_zero = 1;
1906 /* A helper function that decides whether a section is empty,
1910 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1912 return info->asection == NULL || info->size == 0;
1915 /* Read the contents of the section INFO.
1916 OBJFILE is the main object file, but not necessarily the file where
1917 the section comes from. E.g., for DWO files INFO->asection->owner
1918 is the bfd of the DWO file.
1919 If the section is compressed, uncompress it before returning. */
1922 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1924 asection *sectp = info->asection;
1926 gdb_byte *buf, *retbuf;
1927 unsigned char header[4];
1931 info->buffer = NULL;
1934 if (dwarf2_section_empty_p (info))
1937 abfd = sectp->owner;
1939 /* If the section has relocations, we must read it ourselves.
1940 Otherwise we attach it to the BFD. */
1941 if ((sectp->flags & SEC_RELOC) == 0)
1943 info->buffer = gdb_bfd_map_section (sectp, &info->size);
1947 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1950 /* When debugging .o files, we may need to apply relocations; see
1951 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1952 We never compress sections in .o files, so we only need to
1953 try this when the section is not compressed. */
1954 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
1957 info->buffer = retbuf;
1961 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
1962 || bfd_bread (buf, info->size, abfd) != info->size)
1963 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
1964 bfd_get_filename (abfd));
1967 /* A helper function that returns the size of a section in a safe way.
1968 If you are positive that the section has been read before using the
1969 size, then it is safe to refer to the dwarf2_section_info object's
1970 "size" field directly. In other cases, you must call this
1971 function, because for compressed sections the size field is not set
1972 correctly until the section has been read. */
1974 static bfd_size_type
1975 dwarf2_section_size (struct objfile *objfile,
1976 struct dwarf2_section_info *info)
1979 dwarf2_read_section (objfile, info);
1983 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
1987 dwarf2_get_section_info (struct objfile *objfile,
1988 enum dwarf2_section_enum sect,
1989 asection **sectp, const gdb_byte **bufp,
1990 bfd_size_type *sizep)
1992 struct dwarf2_per_objfile *data
1993 = objfile_data (objfile, dwarf2_objfile_data_key);
1994 struct dwarf2_section_info *info;
1996 /* We may see an objfile without any DWARF, in which case we just
2007 case DWARF2_DEBUG_FRAME:
2008 info = &data->frame;
2010 case DWARF2_EH_FRAME:
2011 info = &data->eh_frame;
2014 gdb_assert_not_reached ("unexpected section");
2017 dwarf2_read_section (objfile, info);
2019 *sectp = info->asection;
2020 *bufp = info->buffer;
2021 *sizep = info->size;
2024 /* A helper function to find the sections for a .dwz file. */
2027 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2029 struct dwz_file *dwz_file = arg;
2031 /* Note that we only support the standard ELF names, because .dwz
2032 is ELF-only (at the time of writing). */
2033 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2035 dwz_file->abbrev.asection = sectp;
2036 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2038 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2040 dwz_file->info.asection = sectp;
2041 dwz_file->info.size = bfd_get_section_size (sectp);
2043 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2045 dwz_file->str.asection = sectp;
2046 dwz_file->str.size = bfd_get_section_size (sectp);
2048 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2050 dwz_file->line.asection = sectp;
2051 dwz_file->line.size = bfd_get_section_size (sectp);
2053 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2055 dwz_file->macro.asection = sectp;
2056 dwz_file->macro.size = bfd_get_section_size (sectp);
2058 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2060 dwz_file->gdb_index.asection = sectp;
2061 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2065 /* Open the separate '.dwz' debug file, if needed. Error if the file
2068 static struct dwz_file *
2069 dwarf2_get_dwz_file (void)
2071 bfd *abfd, *dwz_bfd;
2074 struct cleanup *cleanup;
2075 const char *filename;
2076 struct dwz_file *result;
2078 if (dwarf2_per_objfile->dwz_file != NULL)
2079 return dwarf2_per_objfile->dwz_file;
2081 abfd = dwarf2_per_objfile->objfile->obfd;
2082 section = bfd_get_section_by_name (abfd, ".gnu_debugaltlink");
2083 if (section == NULL)
2084 error (_("could not find '.gnu_debugaltlink' section"));
2085 if (!bfd_malloc_and_get_section (abfd, section, &data))
2086 error (_("could not read '.gnu_debugaltlink' section: %s"),
2087 bfd_errmsg (bfd_get_error ()));
2088 cleanup = make_cleanup (xfree, data);
2091 if (!IS_ABSOLUTE_PATH (filename))
2093 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name);
2096 make_cleanup (xfree, abs);
2097 abs = ldirname (abs);
2098 make_cleanup (xfree, abs);
2100 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2101 make_cleanup (xfree, rel);
2105 /* The format is just a NUL-terminated file name, followed by the
2106 build-id. For now, though, we ignore the build-id. */
2107 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2108 if (dwz_bfd == NULL)
2109 error (_("could not read '%s': %s"), filename,
2110 bfd_errmsg (bfd_get_error ()));
2112 if (!bfd_check_format (dwz_bfd, bfd_object))
2114 gdb_bfd_unref (dwz_bfd);
2115 error (_("file '%s' was not usable: %s"), filename,
2116 bfd_errmsg (bfd_get_error ()));
2119 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2121 result->dwz_bfd = dwz_bfd;
2123 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2125 do_cleanups (cleanup);
2127 dwarf2_per_objfile->dwz_file = result;
2131 /* DWARF quick_symbols_functions support. */
2133 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2134 unique line tables, so we maintain a separate table of all .debug_line
2135 derived entries to support the sharing.
2136 All the quick functions need is the list of file names. We discard the
2137 line_header when we're done and don't need to record it here. */
2138 struct quick_file_names
2140 /* The data used to construct the hash key. */
2141 struct stmt_list_hash hash;
2143 /* The number of entries in file_names, real_names. */
2144 unsigned int num_file_names;
2146 /* The file names from the line table, after being run through
2148 const char **file_names;
2150 /* The file names from the line table after being run through
2151 gdb_realpath. These are computed lazily. */
2152 const char **real_names;
2155 /* When using the index (and thus not using psymtabs), each CU has an
2156 object of this type. This is used to hold information needed by
2157 the various "quick" methods. */
2158 struct dwarf2_per_cu_quick_data
2160 /* The file table. This can be NULL if there was no file table
2161 or it's currently not read in.
2162 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2163 struct quick_file_names *file_names;
2165 /* The corresponding symbol table. This is NULL if symbols for this
2166 CU have not yet been read. */
2167 struct symtab *symtab;
2169 /* A temporary mark bit used when iterating over all CUs in
2170 expand_symtabs_matching. */
2171 unsigned int mark : 1;
2173 /* True if we've tried to read the file table and found there isn't one.
2174 There will be no point in trying to read it again next time. */
2175 unsigned int no_file_data : 1;
2178 /* Utility hash function for a stmt_list_hash. */
2181 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2185 if (stmt_list_hash->dwo_unit != NULL)
2186 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2187 v += stmt_list_hash->line_offset.sect_off;
2191 /* Utility equality function for a stmt_list_hash. */
2194 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2195 const struct stmt_list_hash *rhs)
2197 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2199 if (lhs->dwo_unit != NULL
2200 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2203 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2206 /* Hash function for a quick_file_names. */
2209 hash_file_name_entry (const void *e)
2211 const struct quick_file_names *file_data = e;
2213 return hash_stmt_list_entry (&file_data->hash);
2216 /* Equality function for a quick_file_names. */
2219 eq_file_name_entry (const void *a, const void *b)
2221 const struct quick_file_names *ea = a;
2222 const struct quick_file_names *eb = b;
2224 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2227 /* Delete function for a quick_file_names. */
2230 delete_file_name_entry (void *e)
2232 struct quick_file_names *file_data = e;
2235 for (i = 0; i < file_data->num_file_names; ++i)
2237 xfree ((void*) file_data->file_names[i]);
2238 if (file_data->real_names)
2239 xfree ((void*) file_data->real_names[i]);
2242 /* The space for the struct itself lives on objfile_obstack,
2243 so we don't free it here. */
2246 /* Create a quick_file_names hash table. */
2249 create_quick_file_names_table (unsigned int nr_initial_entries)
2251 return htab_create_alloc (nr_initial_entries,
2252 hash_file_name_entry, eq_file_name_entry,
2253 delete_file_name_entry, xcalloc, xfree);
2256 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2257 have to be created afterwards. You should call age_cached_comp_units after
2258 processing PER_CU->CU. dw2_setup must have been already called. */
2261 load_cu (struct dwarf2_per_cu_data *per_cu)
2263 if (per_cu->is_debug_types)
2264 load_full_type_unit (per_cu);
2266 load_full_comp_unit (per_cu, language_minimal);
2268 gdb_assert (per_cu->cu != NULL);
2270 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2273 /* Read in the symbols for PER_CU. */
2276 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2278 struct cleanup *back_to;
2280 /* Skip type_unit_groups, reading the type units they contain
2281 is handled elsewhere. */
2282 if (IS_TYPE_UNIT_GROUP (per_cu))
2285 back_to = make_cleanup (dwarf2_release_queue, NULL);
2287 if (dwarf2_per_objfile->using_index
2288 ? per_cu->v.quick->symtab == NULL
2289 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2291 queue_comp_unit (per_cu, language_minimal);
2297 /* Age the cache, releasing compilation units that have not
2298 been used recently. */
2299 age_cached_comp_units ();
2301 do_cleanups (back_to);
2304 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2305 the objfile from which this CU came. Returns the resulting symbol
2308 static struct symtab *
2309 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2311 gdb_assert (dwarf2_per_objfile->using_index);
2312 if (!per_cu->v.quick->symtab)
2314 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2315 increment_reading_symtab ();
2316 dw2_do_instantiate_symtab (per_cu);
2317 process_cu_includes ();
2318 do_cleanups (back_to);
2320 return per_cu->v.quick->symtab;
2323 /* Return the CU given its index.
2325 This is intended for loops like:
2327 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2328 + dwarf2_per_objfile->n_type_units); ++i)
2330 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2336 static struct dwarf2_per_cu_data *
2337 dw2_get_cu (int index)
2339 if (index >= dwarf2_per_objfile->n_comp_units)
2341 index -= dwarf2_per_objfile->n_comp_units;
2342 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2343 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2346 return dwarf2_per_objfile->all_comp_units[index];
2349 /* Return the primary CU given its index.
2350 The difference between this function and dw2_get_cu is in the handling
2351 of type units (TUs). Here we return the type_unit_group object.
2353 This is intended for loops like:
2355 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2356 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2358 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2364 static struct dwarf2_per_cu_data *
2365 dw2_get_primary_cu (int index)
2367 if (index >= dwarf2_per_objfile->n_comp_units)
2369 index -= dwarf2_per_objfile->n_comp_units;
2370 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2371 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2374 return dwarf2_per_objfile->all_comp_units[index];
2377 /* A helper for create_cus_from_index that handles a given list of
2381 create_cus_from_index_list (struct objfile *objfile,
2382 const gdb_byte *cu_list, offset_type n_elements,
2383 struct dwarf2_section_info *section,
2389 for (i = 0; i < n_elements; i += 2)
2391 struct dwarf2_per_cu_data *the_cu;
2392 ULONGEST offset, length;
2394 gdb_static_assert (sizeof (ULONGEST) >= 8);
2395 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2396 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2399 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2400 struct dwarf2_per_cu_data);
2401 the_cu->offset.sect_off = offset;
2402 the_cu->length = length;
2403 the_cu->objfile = objfile;
2404 the_cu->section = section;
2405 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2406 struct dwarf2_per_cu_quick_data);
2407 the_cu->is_dwz = is_dwz;
2408 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2412 /* Read the CU list from the mapped index, and use it to create all
2413 the CU objects for this objfile. */
2416 create_cus_from_index (struct objfile *objfile,
2417 const gdb_byte *cu_list, offset_type cu_list_elements,
2418 const gdb_byte *dwz_list, offset_type dwz_elements)
2420 struct dwz_file *dwz;
2422 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2423 dwarf2_per_objfile->all_comp_units
2424 = obstack_alloc (&objfile->objfile_obstack,
2425 dwarf2_per_objfile->n_comp_units
2426 * sizeof (struct dwarf2_per_cu_data *));
2428 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2429 &dwarf2_per_objfile->info, 0, 0);
2431 if (dwz_elements == 0)
2434 dwz = dwarf2_get_dwz_file ();
2435 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2436 cu_list_elements / 2);
2439 /* Create the signatured type hash table from the index. */
2442 create_signatured_type_table_from_index (struct objfile *objfile,
2443 struct dwarf2_section_info *section,
2444 const gdb_byte *bytes,
2445 offset_type elements)
2448 htab_t sig_types_hash;
2450 dwarf2_per_objfile->n_type_units = elements / 3;
2451 dwarf2_per_objfile->all_type_units
2452 = obstack_alloc (&objfile->objfile_obstack,
2453 dwarf2_per_objfile->n_type_units
2454 * sizeof (struct signatured_type *));
2456 sig_types_hash = allocate_signatured_type_table (objfile);
2458 for (i = 0; i < elements; i += 3)
2460 struct signatured_type *sig_type;
2461 ULONGEST offset, type_offset_in_tu, signature;
2464 gdb_static_assert (sizeof (ULONGEST) >= 8);
2465 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2466 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2468 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2471 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2472 struct signatured_type);
2473 sig_type->signature = signature;
2474 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2475 sig_type->per_cu.is_debug_types = 1;
2476 sig_type->per_cu.section = section;
2477 sig_type->per_cu.offset.sect_off = offset;
2478 sig_type->per_cu.objfile = objfile;
2479 sig_type->per_cu.v.quick
2480 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2481 struct dwarf2_per_cu_quick_data);
2483 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2486 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2489 dwarf2_per_objfile->signatured_types = sig_types_hash;
2492 /* Read the address map data from the mapped index, and use it to
2493 populate the objfile's psymtabs_addrmap. */
2496 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2498 const gdb_byte *iter, *end;
2499 struct obstack temp_obstack;
2500 struct addrmap *mutable_map;
2501 struct cleanup *cleanup;
2504 obstack_init (&temp_obstack);
2505 cleanup = make_cleanup_obstack_free (&temp_obstack);
2506 mutable_map = addrmap_create_mutable (&temp_obstack);
2508 iter = index->address_table;
2509 end = iter + index->address_table_size;
2511 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2515 ULONGEST hi, lo, cu_index;
2516 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2518 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2520 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2523 if (cu_index < dwarf2_per_objfile->n_comp_units)
2525 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2526 dw2_get_cu (cu_index));
2530 complaint (&symfile_complaints,
2531 _(".gdb_index address table has invalid CU number %u"),
2532 (unsigned) cu_index);
2536 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2537 &objfile->objfile_obstack);
2538 do_cleanups (cleanup);
2541 /* The hash function for strings in the mapped index. This is the same as
2542 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2543 implementation. This is necessary because the hash function is tied to the
2544 format of the mapped index file. The hash values do not have to match with
2547 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2550 mapped_index_string_hash (int index_version, const void *p)
2552 const unsigned char *str = (const unsigned char *) p;
2556 while ((c = *str++) != 0)
2558 if (index_version >= 5)
2560 r = r * 67 + c - 113;
2566 /* Find a slot in the mapped index INDEX for the object named NAME.
2567 If NAME is found, set *VEC_OUT to point to the CU vector in the
2568 constant pool and return 1. If NAME cannot be found, return 0. */
2571 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2572 offset_type **vec_out)
2574 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2576 offset_type slot, step;
2577 int (*cmp) (const char *, const char *);
2579 if (current_language->la_language == language_cplus
2580 || current_language->la_language == language_java
2581 || current_language->la_language == language_fortran)
2583 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2585 const char *paren = strchr (name, '(');
2591 dup = xmalloc (paren - name + 1);
2592 memcpy (dup, name, paren - name);
2593 dup[paren - name] = 0;
2595 make_cleanup (xfree, dup);
2600 /* Index version 4 did not support case insensitive searches. But the
2601 indices for case insensitive languages are built in lowercase, therefore
2602 simulate our NAME being searched is also lowercased. */
2603 hash = mapped_index_string_hash ((index->version == 4
2604 && case_sensitivity == case_sensitive_off
2605 ? 5 : index->version),
2608 slot = hash & (index->symbol_table_slots - 1);
2609 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2610 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2614 /* Convert a slot number to an offset into the table. */
2615 offset_type i = 2 * slot;
2617 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2619 do_cleanups (back_to);
2623 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2624 if (!cmp (name, str))
2626 *vec_out = (offset_type *) (index->constant_pool
2627 + MAYBE_SWAP (index->symbol_table[i + 1]));
2628 do_cleanups (back_to);
2632 slot = (slot + step) & (index->symbol_table_slots - 1);
2636 /* A helper function that reads the .gdb_index from SECTION and fills
2637 in MAP. FILENAME is the name of the file containing the section;
2638 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2639 ok to use deprecated sections.
2641 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2642 out parameters that are filled in with information about the CU and
2643 TU lists in the section.
2645 Returns 1 if all went well, 0 otherwise. */
2648 read_index_from_section (struct objfile *objfile,
2649 const char *filename,
2651 struct dwarf2_section_info *section,
2652 struct mapped_index *map,
2653 const gdb_byte **cu_list,
2654 offset_type *cu_list_elements,
2655 const gdb_byte **types_list,
2656 offset_type *types_list_elements)
2659 offset_type version;
2660 offset_type *metadata;
2663 if (dwarf2_section_empty_p (section))
2666 /* Older elfutils strip versions could keep the section in the main
2667 executable while splitting it for the separate debug info file. */
2668 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2671 dwarf2_read_section (objfile, section);
2673 addr = section->buffer;
2674 /* Version check. */
2675 version = MAYBE_SWAP (*(offset_type *) addr);
2676 /* Versions earlier than 3 emitted every copy of a psymbol. This
2677 causes the index to behave very poorly for certain requests. Version 3
2678 contained incomplete addrmap. So, it seems better to just ignore such
2682 static int warning_printed = 0;
2683 if (!warning_printed)
2685 warning (_("Skipping obsolete .gdb_index section in %s."),
2687 warning_printed = 1;
2691 /* Index version 4 uses a different hash function than index version
2694 Versions earlier than 6 did not emit psymbols for inlined
2695 functions. Using these files will cause GDB not to be able to
2696 set breakpoints on inlined functions by name, so we ignore these
2697 indices unless the user has done
2698 "set use-deprecated-index-sections on". */
2699 if (version < 6 && !deprecated_ok)
2701 static int warning_printed = 0;
2702 if (!warning_printed)
2705 Skipping deprecated .gdb_index section in %s.\n\
2706 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2707 to use the section anyway."),
2709 warning_printed = 1;
2713 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2714 of the TU (for symbols coming from TUs). It's just a performance bug, and
2715 we can't distinguish gdb-generated indices from gold-generated ones, so
2716 nothing to do here. */
2718 /* Indexes with higher version than the one supported by GDB may be no
2719 longer backward compatible. */
2723 map->version = version;
2724 map->total_size = section->size;
2726 metadata = (offset_type *) (addr + sizeof (offset_type));
2729 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2730 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2734 *types_list = addr + MAYBE_SWAP (metadata[i]);
2735 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2736 - MAYBE_SWAP (metadata[i]))
2740 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2741 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2742 - MAYBE_SWAP (metadata[i]));
2745 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2746 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2747 - MAYBE_SWAP (metadata[i]))
2748 / (2 * sizeof (offset_type)));
2751 map->constant_pool = addr + MAYBE_SWAP (metadata[i]);
2757 /* Read the index file. If everything went ok, initialize the "quick"
2758 elements of all the CUs and return 1. Otherwise, return 0. */
2761 dwarf2_read_index (struct objfile *objfile)
2763 struct mapped_index local_map, *map;
2764 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2765 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2767 if (!read_index_from_section (objfile, objfile->name,
2768 use_deprecated_index_sections,
2769 &dwarf2_per_objfile->gdb_index, &local_map,
2770 &cu_list, &cu_list_elements,
2771 &types_list, &types_list_elements))
2774 /* Don't use the index if it's empty. */
2775 if (local_map.symbol_table_slots == 0)
2778 /* If there is a .dwz file, read it so we can get its CU list as
2780 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
2782 struct dwz_file *dwz = dwarf2_get_dwz_file ();
2783 struct mapped_index dwz_map;
2784 const gdb_byte *dwz_types_ignore;
2785 offset_type dwz_types_elements_ignore;
2787 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2789 &dwz->gdb_index, &dwz_map,
2790 &dwz_list, &dwz_list_elements,
2792 &dwz_types_elements_ignore))
2794 warning (_("could not read '.gdb_index' section from %s; skipping"),
2795 bfd_get_filename (dwz->dwz_bfd));
2800 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2803 if (types_list_elements)
2805 struct dwarf2_section_info *section;
2807 /* We can only handle a single .debug_types when we have an
2809 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2812 section = VEC_index (dwarf2_section_info_def,
2813 dwarf2_per_objfile->types, 0);
2815 create_signatured_type_table_from_index (objfile, section, types_list,
2816 types_list_elements);
2819 create_addrmap_from_index (objfile, &local_map);
2821 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2824 dwarf2_per_objfile->index_table = map;
2825 dwarf2_per_objfile->using_index = 1;
2826 dwarf2_per_objfile->quick_file_names_table =
2827 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2832 /* A helper for the "quick" functions which sets the global
2833 dwarf2_per_objfile according to OBJFILE. */
2836 dw2_setup (struct objfile *objfile)
2838 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2839 gdb_assert (dwarf2_per_objfile);
2842 /* die_reader_func for dw2_get_file_names. */
2845 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2846 const gdb_byte *info_ptr,
2847 struct die_info *comp_unit_die,
2851 struct dwarf2_cu *cu = reader->cu;
2852 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2853 struct objfile *objfile = dwarf2_per_objfile->objfile;
2854 struct dwarf2_per_cu_data *lh_cu;
2855 struct line_header *lh;
2856 struct attribute *attr;
2858 const char *name, *comp_dir;
2860 struct quick_file_names *qfn;
2861 unsigned int line_offset;
2863 gdb_assert (! this_cu->is_debug_types);
2865 /* Our callers never want to match partial units -- instead they
2866 will match the enclosing full CU. */
2867 if (comp_unit_die->tag == DW_TAG_partial_unit)
2869 this_cu->v.quick->no_file_data = 1;
2878 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2881 struct quick_file_names find_entry;
2883 line_offset = DW_UNSND (attr);
2885 /* We may have already read in this line header (TU line header sharing).
2886 If we have we're done. */
2887 find_entry.hash.dwo_unit = cu->dwo_unit;
2888 find_entry.hash.line_offset.sect_off = line_offset;
2889 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2890 &find_entry, INSERT);
2893 lh_cu->v.quick->file_names = *slot;
2897 lh = dwarf_decode_line_header (line_offset, cu);
2901 lh_cu->v.quick->no_file_data = 1;
2905 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2906 qfn->hash.dwo_unit = cu->dwo_unit;
2907 qfn->hash.line_offset.sect_off = line_offset;
2908 gdb_assert (slot != NULL);
2911 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2913 qfn->num_file_names = lh->num_file_names;
2914 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2915 lh->num_file_names * sizeof (char *));
2916 for (i = 0; i < lh->num_file_names; ++i)
2917 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2918 qfn->real_names = NULL;
2920 free_line_header (lh);
2922 lh_cu->v.quick->file_names = qfn;
2925 /* A helper for the "quick" functions which attempts to read the line
2926 table for THIS_CU. */
2928 static struct quick_file_names *
2929 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
2931 /* This should never be called for TUs. */
2932 gdb_assert (! this_cu->is_debug_types);
2933 /* Nor type unit groups. */
2934 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
2936 if (this_cu->v.quick->file_names != NULL)
2937 return this_cu->v.quick->file_names;
2938 /* If we know there is no line data, no point in looking again. */
2939 if (this_cu->v.quick->no_file_data)
2942 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
2944 if (this_cu->v.quick->no_file_data)
2946 return this_cu->v.quick->file_names;
2949 /* A helper for the "quick" functions which computes and caches the
2950 real path for a given file name from the line table. */
2953 dw2_get_real_path (struct objfile *objfile,
2954 struct quick_file_names *qfn, int index)
2956 if (qfn->real_names == NULL)
2957 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
2958 qfn->num_file_names, sizeof (char *));
2960 if (qfn->real_names[index] == NULL)
2961 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
2963 return qfn->real_names[index];
2966 static struct symtab *
2967 dw2_find_last_source_symtab (struct objfile *objfile)
2971 dw2_setup (objfile);
2972 index = dwarf2_per_objfile->n_comp_units - 1;
2973 return dw2_instantiate_symtab (dw2_get_cu (index));
2976 /* Traversal function for dw2_forget_cached_source_info. */
2979 dw2_free_cached_file_names (void **slot, void *info)
2981 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
2983 if (file_data->real_names)
2987 for (i = 0; i < file_data->num_file_names; ++i)
2989 xfree ((void*) file_data->real_names[i]);
2990 file_data->real_names[i] = NULL;
2998 dw2_forget_cached_source_info (struct objfile *objfile)
3000 dw2_setup (objfile);
3002 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3003 dw2_free_cached_file_names, NULL);
3006 /* Helper function for dw2_map_symtabs_matching_filename that expands
3007 the symtabs and calls the iterator. */
3010 dw2_map_expand_apply (struct objfile *objfile,
3011 struct dwarf2_per_cu_data *per_cu,
3012 const char *name, const char *real_path,
3013 int (*callback) (struct symtab *, void *),
3016 struct symtab *last_made = objfile->symtabs;
3018 /* Don't visit already-expanded CUs. */
3019 if (per_cu->v.quick->symtab)
3022 /* This may expand more than one symtab, and we want to iterate over
3024 dw2_instantiate_symtab (per_cu);
3026 return iterate_over_some_symtabs (name, real_path, callback, data,
3027 objfile->symtabs, last_made);
3030 /* Implementation of the map_symtabs_matching_filename method. */
3033 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3034 const char *real_path,
3035 int (*callback) (struct symtab *, void *),
3039 const char *name_basename = lbasename (name);
3041 dw2_setup (objfile);
3043 /* The rule is CUs specify all the files, including those used by
3044 any TU, so there's no need to scan TUs here. */
3046 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3049 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3050 struct quick_file_names *file_data;
3052 /* We only need to look at symtabs not already expanded. */
3053 if (per_cu->v.quick->symtab)
3056 file_data = dw2_get_file_names (per_cu);
3057 if (file_data == NULL)
3060 for (j = 0; j < file_data->num_file_names; ++j)
3062 const char *this_name = file_data->file_names[j];
3063 const char *this_real_name;
3065 if (compare_filenames_for_search (this_name, name))
3067 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3073 /* Before we invoke realpath, which can get expensive when many
3074 files are involved, do a quick comparison of the basenames. */
3075 if (! basenames_may_differ
3076 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3079 this_real_name = dw2_get_real_path (objfile, file_data, j);
3080 if (compare_filenames_for_search (this_real_name, name))
3082 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3088 if (real_path != NULL)
3090 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3091 gdb_assert (IS_ABSOLUTE_PATH (name));
3092 if (this_real_name != NULL
3093 && FILENAME_CMP (real_path, this_real_name) == 0)
3095 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3107 /* Struct used to manage iterating over all CUs looking for a symbol. */
3109 struct dw2_symtab_iterator
3111 /* The internalized form of .gdb_index. */
3112 struct mapped_index *index;
3113 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3114 int want_specific_block;
3115 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3116 Unused if !WANT_SPECIFIC_BLOCK. */
3118 /* The kind of symbol we're looking for. */
3120 /* The list of CUs from the index entry of the symbol,
3121 or NULL if not found. */
3123 /* The next element in VEC to look at. */
3125 /* The number of elements in VEC, or zero if there is no match. */
3129 /* Initialize the index symtab iterator ITER.
3130 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3131 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3134 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3135 struct mapped_index *index,
3136 int want_specific_block,
3141 iter->index = index;
3142 iter->want_specific_block = want_specific_block;
3143 iter->block_index = block_index;
3144 iter->domain = domain;
3147 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3148 iter->length = MAYBE_SWAP (*iter->vec);
3156 /* Return the next matching CU or NULL if there are no more. */
3158 static struct dwarf2_per_cu_data *
3159 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3161 for ( ; iter->next < iter->length; ++iter->next)
3163 offset_type cu_index_and_attrs =
3164 MAYBE_SWAP (iter->vec[iter->next + 1]);
3165 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3166 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (cu_index);
3167 int want_static = iter->block_index != GLOBAL_BLOCK;
3168 /* This value is only valid for index versions >= 7. */
3169 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3170 gdb_index_symbol_kind symbol_kind =
3171 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3172 /* Only check the symbol attributes if they're present.
3173 Indices prior to version 7 don't record them,
3174 and indices >= 7 may elide them for certain symbols
3175 (gold does this). */
3177 (iter->index->version >= 7
3178 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3180 /* Skip if already read in. */
3181 if (per_cu->v.quick->symtab)
3185 && iter->want_specific_block
3186 && want_static != is_static)
3189 /* Only check the symbol's kind if it has one. */
3192 switch (iter->domain)
3195 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3196 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3197 /* Some types are also in VAR_DOMAIN. */
3198 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3202 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3206 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3221 static struct symtab *
3222 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3223 const char *name, domain_enum domain)
3225 struct symtab *stab_best = NULL;
3226 struct mapped_index *index;
3228 dw2_setup (objfile);
3230 index = dwarf2_per_objfile->index_table;
3232 /* index is NULL if OBJF_READNOW. */
3235 struct dw2_symtab_iterator iter;
3236 struct dwarf2_per_cu_data *per_cu;
3238 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3240 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3242 struct symbol *sym = NULL;
3243 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3245 /* Some caution must be observed with overloaded functions
3246 and methods, since the index will not contain any overload
3247 information (but NAME might contain it). */
3250 struct blockvector *bv = BLOCKVECTOR (stab);
3251 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3253 sym = lookup_block_symbol (block, name, domain);
3256 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3258 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3264 /* Keep looking through other CUs. */
3272 dw2_print_stats (struct objfile *objfile)
3274 int i, total, count;
3276 dw2_setup (objfile);
3277 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3279 for (i = 0; i < total; ++i)
3281 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3283 if (!per_cu->v.quick->symtab)
3286 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3287 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3291 dw2_dump (struct objfile *objfile)
3293 /* Nothing worth printing. */
3297 dw2_relocate (struct objfile *objfile, struct section_offsets *new_offsets,
3298 struct section_offsets *delta)
3300 /* There's nothing to relocate here. */
3304 dw2_expand_symtabs_for_function (struct objfile *objfile,
3305 const char *func_name)
3307 struct mapped_index *index;
3309 dw2_setup (objfile);
3311 index = dwarf2_per_objfile->index_table;
3313 /* index is NULL if OBJF_READNOW. */
3316 struct dw2_symtab_iterator iter;
3317 struct dwarf2_per_cu_data *per_cu;
3319 /* Note: It doesn't matter what we pass for block_index here. */
3320 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3323 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3324 dw2_instantiate_symtab (per_cu);
3329 dw2_expand_all_symtabs (struct objfile *objfile)
3333 dw2_setup (objfile);
3335 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3336 + dwarf2_per_objfile->n_type_units); ++i)
3338 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3340 dw2_instantiate_symtab (per_cu);
3345 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3346 const char *fullname)
3350 dw2_setup (objfile);
3352 /* We don't need to consider type units here.
3353 This is only called for examining code, e.g. expand_line_sal.
3354 There can be an order of magnitude (or more) more type units
3355 than comp units, and we avoid them if we can. */
3357 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3360 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3361 struct quick_file_names *file_data;
3363 /* We only need to look at symtabs not already expanded. */
3364 if (per_cu->v.quick->symtab)
3367 file_data = dw2_get_file_names (per_cu);
3368 if (file_data == NULL)
3371 for (j = 0; j < file_data->num_file_names; ++j)
3373 const char *this_fullname = file_data->file_names[j];
3375 if (filename_cmp (this_fullname, fullname) == 0)
3377 dw2_instantiate_symtab (per_cu);
3384 /* A helper function for dw2_find_symbol_file that finds the primary
3385 file name for a given CU. This is a die_reader_func. */
3388 dw2_get_primary_filename_reader (const struct die_reader_specs *reader,
3389 const gdb_byte *info_ptr,
3390 struct die_info *comp_unit_die,
3394 const char **result_ptr = data;
3395 struct dwarf2_cu *cu = reader->cu;
3396 struct attribute *attr;
3398 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
3402 *result_ptr = DW_STRING (attr);
3406 dw2_find_symbol_file (struct objfile *objfile, const char *name)
3408 struct dwarf2_per_cu_data *per_cu;
3410 const char *filename;
3412 dw2_setup (objfile);
3414 /* index_table is NULL if OBJF_READNOW. */
3415 if (!dwarf2_per_objfile->index_table)
3419 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
3421 struct blockvector *bv = BLOCKVECTOR (s);
3422 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
3423 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN);
3427 /* Only file extension of returned filename is recognized. */
3428 return SYMBOL_SYMTAB (sym)->filename;
3434 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table,
3438 /* Note that this just looks at the very first one named NAME -- but
3439 actually we are looking for a function. find_main_filename
3440 should be rewritten so that it doesn't require a custom hook. It
3441 could just use the ordinary symbol tables. */
3442 /* vec[0] is the length, which must always be >0. */
3443 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1])));
3445 if (per_cu->v.quick->symtab != NULL)
3447 /* Only file extension of returned filename is recognized. */
3448 return per_cu->v.quick->symtab->filename;
3451 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
3452 dw2_get_primary_filename_reader, &filename);
3454 /* Only file extension of returned filename is recognized. */
3459 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3460 struct objfile *objfile, int global,
3461 int (*callback) (struct block *,
3462 struct symbol *, void *),
3463 void *data, symbol_compare_ftype *match,
3464 symbol_compare_ftype *ordered_compare)
3466 /* Currently unimplemented; used for Ada. The function can be called if the
3467 current language is Ada for a non-Ada objfile using GNU index. As Ada
3468 does not look for non-Ada symbols this function should just return. */
3472 dw2_expand_symtabs_matching
3473 (struct objfile *objfile,
3474 int (*file_matcher) (const char *, void *, int basenames),
3475 int (*name_matcher) (const char *, void *),
3476 enum search_domain kind,
3481 struct mapped_index *index;
3483 dw2_setup (objfile);
3485 /* index_table is NULL if OBJF_READNOW. */
3486 if (!dwarf2_per_objfile->index_table)
3488 index = dwarf2_per_objfile->index_table;
3490 if (file_matcher != NULL)
3492 struct cleanup *cleanup;
3493 htab_t visited_found, visited_not_found;
3495 visited_found = htab_create_alloc (10,
3496 htab_hash_pointer, htab_eq_pointer,
3497 NULL, xcalloc, xfree);
3498 cleanup = make_cleanup_htab_delete (visited_found);
3499 visited_not_found = htab_create_alloc (10,
3500 htab_hash_pointer, htab_eq_pointer,
3501 NULL, xcalloc, xfree);
3502 make_cleanup_htab_delete (visited_not_found);
3504 /* The rule is CUs specify all the files, including those used by
3505 any TU, so there's no need to scan TUs here. */
3507 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3510 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3511 struct quick_file_names *file_data;
3514 per_cu->v.quick->mark = 0;
3516 /* We only need to look at symtabs not already expanded. */
3517 if (per_cu->v.quick->symtab)
3520 file_data = dw2_get_file_names (per_cu);
3521 if (file_data == NULL)
3524 if (htab_find (visited_not_found, file_data) != NULL)
3526 else if (htab_find (visited_found, file_data) != NULL)
3528 per_cu->v.quick->mark = 1;
3532 for (j = 0; j < file_data->num_file_names; ++j)
3534 const char *this_real_name;
3536 if (file_matcher (file_data->file_names[j], data, 0))
3538 per_cu->v.quick->mark = 1;
3542 /* Before we invoke realpath, which can get expensive when many
3543 files are involved, do a quick comparison of the basenames. */
3544 if (!basenames_may_differ
3545 && !file_matcher (lbasename (file_data->file_names[j]),
3549 this_real_name = dw2_get_real_path (objfile, file_data, j);
3550 if (file_matcher (this_real_name, data, 0))
3552 per_cu->v.quick->mark = 1;
3557 slot = htab_find_slot (per_cu->v.quick->mark
3559 : visited_not_found,
3564 do_cleanups (cleanup);
3567 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3569 offset_type idx = 2 * iter;
3571 offset_type *vec, vec_len, vec_idx;
3573 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3576 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3578 if (! (*name_matcher) (name, data))
3581 /* The name was matched, now expand corresponding CUs that were
3583 vec = (offset_type *) (index->constant_pool
3584 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3585 vec_len = MAYBE_SWAP (vec[0]);
3586 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3588 struct dwarf2_per_cu_data *per_cu;
3589 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3590 gdb_index_symbol_kind symbol_kind =
3591 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3592 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3594 /* Don't crash on bad data. */
3595 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3596 + dwarf2_per_objfile->n_type_units))
3599 /* Only check the symbol's kind if it has one.
3600 Indices prior to version 7 don't record it. */
3601 if (index->version >= 7)
3605 case VARIABLES_DOMAIN:
3606 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3609 case FUNCTIONS_DOMAIN:
3610 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3614 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3622 per_cu = dw2_get_cu (cu_index);
3623 if (file_matcher == NULL || per_cu->v.quick->mark)
3624 dw2_instantiate_symtab (per_cu);
3629 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3632 static struct symtab *
3633 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3637 if (BLOCKVECTOR (symtab) != NULL
3638 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3641 if (symtab->includes == NULL)
3644 for (i = 0; symtab->includes[i]; ++i)
3646 struct symtab *s = symtab->includes[i];
3648 s = recursively_find_pc_sect_symtab (s, pc);
3656 static struct symtab *
3657 dw2_find_pc_sect_symtab (struct objfile *objfile,
3658 struct minimal_symbol *msymbol,
3660 struct obj_section *section,
3663 struct dwarf2_per_cu_data *data;
3664 struct symtab *result;
3666 dw2_setup (objfile);
3668 if (!objfile->psymtabs_addrmap)
3671 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3675 if (warn_if_readin && data->v.quick->symtab)
3676 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3677 paddress (get_objfile_arch (objfile), pc));
3679 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3680 gdb_assert (result != NULL);
3685 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3686 void *data, int need_fullname)
3689 struct cleanup *cleanup;
3690 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3691 NULL, xcalloc, xfree);
3693 cleanup = make_cleanup_htab_delete (visited);
3694 dw2_setup (objfile);
3696 /* The rule is CUs specify all the files, including those used by
3697 any TU, so there's no need to scan TUs here.
3698 We can ignore file names coming from already-expanded CUs. */
3700 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3702 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3704 if (per_cu->v.quick->symtab)
3706 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3709 *slot = per_cu->v.quick->file_names;
3713 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3716 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3717 struct quick_file_names *file_data;
3720 /* We only need to look at symtabs not already expanded. */
3721 if (per_cu->v.quick->symtab)
3724 file_data = dw2_get_file_names (per_cu);
3725 if (file_data == NULL)
3728 slot = htab_find_slot (visited, file_data, INSERT);
3731 /* Already visited. */
3736 for (j = 0; j < file_data->num_file_names; ++j)
3738 const char *this_real_name;
3741 this_real_name = dw2_get_real_path (objfile, file_data, j);
3743 this_real_name = NULL;
3744 (*fun) (file_data->file_names[j], this_real_name, data);
3748 do_cleanups (cleanup);
3752 dw2_has_symbols (struct objfile *objfile)
3757 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3760 dw2_find_last_source_symtab,
3761 dw2_forget_cached_source_info,
3762 dw2_map_symtabs_matching_filename,
3767 dw2_expand_symtabs_for_function,
3768 dw2_expand_all_symtabs,
3769 dw2_expand_symtabs_with_fullname,
3770 dw2_find_symbol_file,
3771 dw2_map_matching_symbols,
3772 dw2_expand_symtabs_matching,
3773 dw2_find_pc_sect_symtab,
3774 dw2_map_symbol_filenames
3777 /* Initialize for reading DWARF for this objfile. Return 0 if this
3778 file will use psymtabs, or 1 if using the GNU index. */
3781 dwarf2_initialize_objfile (struct objfile *objfile)
3783 /* If we're about to read full symbols, don't bother with the
3784 indices. In this case we also don't care if some other debug
3785 format is making psymtabs, because they are all about to be
3787 if ((objfile->flags & OBJF_READNOW))
3791 dwarf2_per_objfile->using_index = 1;
3792 create_all_comp_units (objfile);
3793 create_all_type_units (objfile);
3794 dwarf2_per_objfile->quick_file_names_table =
3795 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3797 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3798 + dwarf2_per_objfile->n_type_units); ++i)
3800 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3802 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3803 struct dwarf2_per_cu_quick_data);
3806 /* Return 1 so that gdb sees the "quick" functions. However,
3807 these functions will be no-ops because we will have expanded
3812 if (dwarf2_read_index (objfile))
3820 /* Build a partial symbol table. */
3823 dwarf2_build_psymtabs (struct objfile *objfile)
3825 volatile struct gdb_exception except;
3827 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3829 init_psymbol_list (objfile, 1024);
3832 TRY_CATCH (except, RETURN_MASK_ERROR)
3834 /* This isn't really ideal: all the data we allocate on the
3835 objfile's obstack is still uselessly kept around. However,
3836 freeing it seems unsafe. */
3837 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3839 dwarf2_build_psymtabs_hard (objfile);
3840 discard_cleanups (cleanups);
3842 if (except.reason < 0)
3843 exception_print (gdb_stderr, except);
3846 /* Return the total length of the CU described by HEADER. */
3849 get_cu_length (const struct comp_unit_head *header)
3851 return header->initial_length_size + header->length;
3854 /* Return TRUE if OFFSET is within CU_HEADER. */
3857 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3859 sect_offset bottom = { cu_header->offset.sect_off };
3860 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3862 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3865 /* Find the base address of the compilation unit for range lists and
3866 location lists. It will normally be specified by DW_AT_low_pc.
3867 In DWARF-3 draft 4, the base address could be overridden by
3868 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3869 compilation units with discontinuous ranges. */
3872 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3874 struct attribute *attr;
3877 cu->base_address = 0;
3879 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3882 cu->base_address = DW_ADDR (attr);
3887 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3890 cu->base_address = DW_ADDR (attr);
3896 /* Read in the comp unit header information from the debug_info at info_ptr.
3897 NOTE: This leaves members offset, first_die_offset to be filled in
3900 static const gdb_byte *
3901 read_comp_unit_head (struct comp_unit_head *cu_header,
3902 const gdb_byte *info_ptr, bfd *abfd)
3905 unsigned int bytes_read;
3907 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3908 cu_header->initial_length_size = bytes_read;
3909 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3910 info_ptr += bytes_read;
3911 cu_header->version = read_2_bytes (abfd, info_ptr);
3913 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3915 info_ptr += bytes_read;
3916 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3918 signed_addr = bfd_get_sign_extend_vma (abfd);
3919 if (signed_addr < 0)
3920 internal_error (__FILE__, __LINE__,
3921 _("read_comp_unit_head: dwarf from non elf file"));
3922 cu_header->signed_addr_p = signed_addr;
3927 /* Helper function that returns the proper abbrev section for
3930 static struct dwarf2_section_info *
3931 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
3933 struct dwarf2_section_info *abbrev;
3935 if (this_cu->is_dwz)
3936 abbrev = &dwarf2_get_dwz_file ()->abbrev;
3938 abbrev = &dwarf2_per_objfile->abbrev;
3943 /* Subroutine of read_and_check_comp_unit_head and
3944 read_and_check_type_unit_head to simplify them.
3945 Perform various error checking on the header. */
3948 error_check_comp_unit_head (struct comp_unit_head *header,
3949 struct dwarf2_section_info *section,
3950 struct dwarf2_section_info *abbrev_section)
3952 bfd *abfd = section->asection->owner;
3953 const char *filename = bfd_get_filename (abfd);
3955 if (header->version != 2 && header->version != 3 && header->version != 4)
3956 error (_("Dwarf Error: wrong version in compilation unit header "
3957 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
3960 if (header->abbrev_offset.sect_off
3961 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
3962 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
3963 "(offset 0x%lx + 6) [in module %s]"),
3964 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
3967 /* Cast to unsigned long to use 64-bit arithmetic when possible to
3968 avoid potential 32-bit overflow. */
3969 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
3971 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
3972 "(offset 0x%lx + 0) [in module %s]"),
3973 (long) header->length, (long) header->offset.sect_off,
3977 /* Read in a CU/TU header and perform some basic error checking.
3978 The contents of the header are stored in HEADER.
3979 The result is a pointer to the start of the first DIE. */
3981 static const gdb_byte *
3982 read_and_check_comp_unit_head (struct comp_unit_head *header,
3983 struct dwarf2_section_info *section,
3984 struct dwarf2_section_info *abbrev_section,
3985 const gdb_byte *info_ptr,
3986 int is_debug_types_section)
3988 const gdb_byte *beg_of_comp_unit = info_ptr;
3989 bfd *abfd = section->asection->owner;
3991 header->offset.sect_off = beg_of_comp_unit - section->buffer;
3993 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
3995 /* If we're reading a type unit, skip over the signature and
3996 type_offset fields. */
3997 if (is_debug_types_section)
3998 info_ptr += 8 /*signature*/ + header->offset_size;
4000 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4002 error_check_comp_unit_head (header, section, abbrev_section);
4007 /* Read in the types comp unit header information from .debug_types entry at
4008 types_ptr. The result is a pointer to one past the end of the header. */
4010 static const gdb_byte *
4011 read_and_check_type_unit_head (struct comp_unit_head *header,
4012 struct dwarf2_section_info *section,
4013 struct dwarf2_section_info *abbrev_section,
4014 const gdb_byte *info_ptr,
4015 ULONGEST *signature,
4016 cu_offset *type_offset_in_tu)
4018 const gdb_byte *beg_of_comp_unit = info_ptr;
4019 bfd *abfd = section->asection->owner;
4021 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4023 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4025 /* If we're reading a type unit, skip over the signature and
4026 type_offset fields. */
4027 if (signature != NULL)
4028 *signature = read_8_bytes (abfd, info_ptr);
4030 if (type_offset_in_tu != NULL)
4031 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4032 header->offset_size);
4033 info_ptr += header->offset_size;
4035 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4037 error_check_comp_unit_head (header, section, abbrev_section);
4042 /* Fetch the abbreviation table offset from a comp or type unit header. */
4045 read_abbrev_offset (struct dwarf2_section_info *section,
4048 bfd *abfd = section->asection->owner;
4049 const gdb_byte *info_ptr;
4050 unsigned int length, initial_length_size, offset_size;
4051 sect_offset abbrev_offset;
4053 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4054 info_ptr = section->buffer + offset.sect_off;
4055 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4056 offset_size = initial_length_size == 4 ? 4 : 8;
4057 info_ptr += initial_length_size + 2 /*version*/;
4058 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4059 return abbrev_offset;
4062 /* Allocate a new partial symtab for file named NAME and mark this new
4063 partial symtab as being an include of PST. */
4066 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4067 struct objfile *objfile)
4069 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4071 if (!IS_ABSOLUTE_PATH (subpst->filename))
4073 /* It shares objfile->objfile_obstack. */
4074 subpst->dirname = pst->dirname;
4077 subpst->section_offsets = pst->section_offsets;
4078 subpst->textlow = 0;
4079 subpst->texthigh = 0;
4081 subpst->dependencies = (struct partial_symtab **)
4082 obstack_alloc (&objfile->objfile_obstack,
4083 sizeof (struct partial_symtab *));
4084 subpst->dependencies[0] = pst;
4085 subpst->number_of_dependencies = 1;
4087 subpst->globals_offset = 0;
4088 subpst->n_global_syms = 0;
4089 subpst->statics_offset = 0;
4090 subpst->n_static_syms = 0;
4091 subpst->symtab = NULL;
4092 subpst->read_symtab = pst->read_symtab;
4095 /* No private part is necessary for include psymtabs. This property
4096 can be used to differentiate between such include psymtabs and
4097 the regular ones. */
4098 subpst->read_symtab_private = NULL;
4101 /* Read the Line Number Program data and extract the list of files
4102 included by the source file represented by PST. Build an include
4103 partial symtab for each of these included files. */
4106 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4107 struct die_info *die,
4108 struct partial_symtab *pst)
4110 struct line_header *lh = NULL;
4111 struct attribute *attr;
4113 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4115 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4117 return; /* No linetable, so no includes. */
4119 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4120 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4122 free_line_header (lh);
4126 hash_signatured_type (const void *item)
4128 const struct signatured_type *sig_type = item;
4130 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4131 return sig_type->signature;
4135 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4137 const struct signatured_type *lhs = item_lhs;
4138 const struct signatured_type *rhs = item_rhs;
4140 return lhs->signature == rhs->signature;
4143 /* Allocate a hash table for signatured types. */
4146 allocate_signatured_type_table (struct objfile *objfile)
4148 return htab_create_alloc_ex (41,
4149 hash_signatured_type,
4152 &objfile->objfile_obstack,
4153 hashtab_obstack_allocate,
4154 dummy_obstack_deallocate);
4157 /* A helper function to add a signatured type CU to a table. */
4160 add_signatured_type_cu_to_table (void **slot, void *datum)
4162 struct signatured_type *sigt = *slot;
4163 struct signatured_type ***datap = datum;
4171 /* Create the hash table of all entries in the .debug_types
4172 (or .debug_types.dwo) section(s).
4173 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4174 otherwise it is NULL.
4176 The result is a pointer to the hash table or NULL if there are no types.
4178 Note: This function processes DWO files only, not DWP files. */
4181 create_debug_types_hash_table (struct dwo_file *dwo_file,
4182 VEC (dwarf2_section_info_def) *types)
4184 struct objfile *objfile = dwarf2_per_objfile->objfile;
4185 htab_t types_htab = NULL;
4187 struct dwarf2_section_info *section;
4188 struct dwarf2_section_info *abbrev_section;
4190 if (VEC_empty (dwarf2_section_info_def, types))
4193 abbrev_section = (dwo_file != NULL
4194 ? &dwo_file->sections.abbrev
4195 : &dwarf2_per_objfile->abbrev);
4197 if (dwarf2_read_debug)
4198 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4199 dwo_file ? ".dwo" : "",
4200 bfd_get_filename (abbrev_section->asection->owner));
4203 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4207 const gdb_byte *info_ptr, *end_ptr;
4208 struct dwarf2_section_info *abbrev_section;
4210 dwarf2_read_section (objfile, section);
4211 info_ptr = section->buffer;
4213 if (info_ptr == NULL)
4216 /* We can't set abfd until now because the section may be empty or
4217 not present, in which case section->asection will be NULL. */
4218 abfd = section->asection->owner;
4221 abbrev_section = &dwo_file->sections.abbrev;
4223 abbrev_section = &dwarf2_per_objfile->abbrev;
4225 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4226 because we don't need to read any dies: the signature is in the
4229 end_ptr = info_ptr + section->size;
4230 while (info_ptr < end_ptr)
4233 cu_offset type_offset_in_tu;
4235 struct signatured_type *sig_type;
4236 struct dwo_unit *dwo_tu;
4238 const gdb_byte *ptr = info_ptr;
4239 struct comp_unit_head header;
4240 unsigned int length;
4242 offset.sect_off = ptr - section->buffer;
4244 /* We need to read the type's signature in order to build the hash
4245 table, but we don't need anything else just yet. */
4247 ptr = read_and_check_type_unit_head (&header, section,
4248 abbrev_section, ptr,
4249 &signature, &type_offset_in_tu);
4251 length = get_cu_length (&header);
4253 /* Skip dummy type units. */
4254 if (ptr >= info_ptr + length
4255 || peek_abbrev_code (abfd, ptr) == 0)
4261 if (types_htab == NULL)
4264 types_htab = allocate_dwo_unit_table (objfile);
4266 types_htab = allocate_signatured_type_table (objfile);
4272 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4274 dwo_tu->dwo_file = dwo_file;
4275 dwo_tu->signature = signature;
4276 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4277 dwo_tu->section = section;
4278 dwo_tu->offset = offset;
4279 dwo_tu->length = length;
4283 /* N.B.: type_offset is not usable if this type uses a DWO file.
4284 The real type_offset is in the DWO file. */
4286 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4287 struct signatured_type);
4288 sig_type->signature = signature;
4289 sig_type->type_offset_in_tu = type_offset_in_tu;
4290 sig_type->per_cu.objfile = objfile;
4291 sig_type->per_cu.is_debug_types = 1;
4292 sig_type->per_cu.section = section;
4293 sig_type->per_cu.offset = offset;
4294 sig_type->per_cu.length = length;
4297 slot = htab_find_slot (types_htab,
4298 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4300 gdb_assert (slot != NULL);
4303 sect_offset dup_offset;
4307 const struct dwo_unit *dup_tu = *slot;
4309 dup_offset = dup_tu->offset;
4313 const struct signatured_type *dup_tu = *slot;
4315 dup_offset = dup_tu->per_cu.offset;
4318 complaint (&symfile_complaints,
4319 _("debug type entry at offset 0x%x is duplicate to"
4320 " the entry at offset 0x%x, signature 0x%s"),
4321 offset.sect_off, dup_offset.sect_off,
4322 phex (signature, sizeof (signature)));
4324 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4326 if (dwarf2_read_debug)
4327 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature 0x%s\n",
4329 phex (signature, sizeof (signature)));
4338 /* Create the hash table of all entries in the .debug_types section,
4339 and initialize all_type_units.
4340 The result is zero if there is an error (e.g. missing .debug_types section),
4341 otherwise non-zero. */
4344 create_all_type_units (struct objfile *objfile)
4347 struct signatured_type **iter;
4349 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4350 if (types_htab == NULL)
4352 dwarf2_per_objfile->signatured_types = NULL;
4356 dwarf2_per_objfile->signatured_types = types_htab;
4358 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4359 dwarf2_per_objfile->all_type_units
4360 = obstack_alloc (&objfile->objfile_obstack,
4361 dwarf2_per_objfile->n_type_units
4362 * sizeof (struct signatured_type *));
4363 iter = &dwarf2_per_objfile->all_type_units[0];
4364 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4365 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4366 == dwarf2_per_objfile->n_type_units);
4371 /* Lookup a signature based type for DW_FORM_ref_sig8.
4372 Returns NULL if signature SIG is not present in the table.
4373 It is up to the caller to complain about this. */
4375 static struct signatured_type *
4376 lookup_signatured_type (ULONGEST sig)
4378 struct signatured_type find_entry, *entry;
4380 if (dwarf2_per_objfile->signatured_types == NULL)
4382 find_entry.signature = sig;
4383 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4387 /* Low level DIE reading support. */
4389 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4392 init_cu_die_reader (struct die_reader_specs *reader,
4393 struct dwarf2_cu *cu,
4394 struct dwarf2_section_info *section,
4395 struct dwo_file *dwo_file)
4397 gdb_assert (section->readin && section->buffer != NULL);
4398 reader->abfd = section->asection->owner;
4400 reader->dwo_file = dwo_file;
4401 reader->die_section = section;
4402 reader->buffer = section->buffer;
4403 reader->buffer_end = section->buffer + section->size;
4406 /* Subroutine of init_cutu_and_read_dies to simplify it.
4407 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4408 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4411 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4412 from it to the DIE in the DWO. If NULL we are skipping the stub.
4413 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4414 are filled in with the info of the DIE from the DWO file.
4415 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4416 provided an abbrev table to use.
4417 The result is non-zero if a valid (non-dummy) DIE was found. */
4420 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4421 struct dwo_unit *dwo_unit,
4422 int abbrev_table_provided,
4423 struct die_info *stub_comp_unit_die,
4424 struct die_reader_specs *result_reader,
4425 const gdb_byte **result_info_ptr,
4426 struct die_info **result_comp_unit_die,
4427 int *result_has_children)
4429 struct objfile *objfile = dwarf2_per_objfile->objfile;
4430 struct dwarf2_cu *cu = this_cu->cu;
4431 struct dwarf2_section_info *section;
4433 const gdb_byte *begin_info_ptr, *info_ptr;
4434 const char *comp_dir_string;
4435 ULONGEST signature; /* Or dwo_id. */
4436 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4437 int i,num_extra_attrs;
4438 struct dwarf2_section_info *dwo_abbrev_section;
4439 struct attribute *attr;
4440 struct die_info *comp_unit_die;
4442 /* These attributes aren't processed until later:
4443 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4444 However, the attribute is found in the stub which we won't have later.
4445 In order to not impose this complication on the rest of the code,
4446 we read them here and copy them to the DWO CU/TU die. */
4454 if (stub_comp_unit_die != NULL)
4456 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4458 if (! this_cu->is_debug_types)
4459 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4460 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4461 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4462 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4463 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4465 /* There should be a DW_AT_addr_base attribute here (if needed).
4466 We need the value before we can process DW_FORM_GNU_addr_index. */
4468 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4470 cu->addr_base = DW_UNSND (attr);
4472 /* There should be a DW_AT_ranges_base attribute here (if needed).
4473 We need the value before we can process DW_AT_ranges. */
4474 cu->ranges_base = 0;
4475 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4477 cu->ranges_base = DW_UNSND (attr);
4480 /* Set up for reading the DWO CU/TU. */
4481 cu->dwo_unit = dwo_unit;
4482 section = dwo_unit->section;
4483 dwarf2_read_section (objfile, section);
4484 abfd = section->asection->owner;
4485 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4486 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4487 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
4489 if (this_cu->is_debug_types)
4491 ULONGEST header_signature;
4492 cu_offset type_offset_in_tu;
4493 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
4495 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4499 &type_offset_in_tu);
4500 gdb_assert (sig_type->signature == header_signature);
4501 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4502 /* For DWOs coming from DWP files, we don't know the CU length
4503 nor the type's offset in the TU until now. */
4504 dwo_unit->length = get_cu_length (&cu->header);
4505 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4507 /* Establish the type offset that can be used to lookup the type.
4508 For DWO files, we don't know it until now. */
4509 sig_type->type_offset_in_section.sect_off =
4510 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4514 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
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
4520 dwo_unit->length = get_cu_length (&cu->header);
4523 /* Replace the CU's original abbrev table with the DWO's.
4524 Reminder: We can't read the abbrev table until we've read the header. */
4525 if (abbrev_table_provided)
4527 /* Don't free the provided abbrev table, the caller of
4528 init_cutu_and_read_dies owns it. */
4529 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4530 /* Ensure the DWO abbrev table gets freed. */
4531 make_cleanup (dwarf2_free_abbrev_table, cu);
4535 dwarf2_free_abbrev_table (cu);
4536 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4537 /* Leave any existing abbrev table cleanup as is. */
4540 /* Read in the die, but leave space to copy over the attributes
4541 from the stub. This has the benefit of simplifying the rest of
4542 the code - all the work to maintain the illusion of a single
4543 DW_TAG_{compile,type}_unit DIE is done here. */
4544 num_extra_attrs = ((stmt_list != NULL)
4548 + (comp_dir != NULL));
4549 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
4550 result_has_children, num_extra_attrs);
4552 /* Copy over the attributes from the stub to the DIE we just read in. */
4553 comp_unit_die = *result_comp_unit_die;
4554 i = comp_unit_die->num_attrs;
4555 if (stmt_list != NULL)
4556 comp_unit_die->attrs[i++] = *stmt_list;
4558 comp_unit_die->attrs[i++] = *low_pc;
4559 if (high_pc != NULL)
4560 comp_unit_die->attrs[i++] = *high_pc;
4562 comp_unit_die->attrs[i++] = *ranges;
4563 if (comp_dir != NULL)
4564 comp_unit_die->attrs[i++] = *comp_dir;
4565 comp_unit_die->num_attrs += num_extra_attrs;
4567 if (dwarf2_die_debug)
4569 fprintf_unfiltered (gdb_stdlog,
4570 "Read die from %s@0x%x of %s:\n",
4571 bfd_section_name (abfd, section->asection),
4572 (unsigned) (begin_info_ptr - section->buffer),
4573 bfd_get_filename (abfd));
4574 dump_die (comp_unit_die, dwarf2_die_debug);
4577 /* Skip dummy compilation units. */
4578 if (info_ptr >= begin_info_ptr + dwo_unit->length
4579 || peek_abbrev_code (abfd, info_ptr) == 0)
4582 *result_info_ptr = info_ptr;
4586 /* Subroutine of init_cutu_and_read_dies to simplify it.
4587 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
4588 If the specified DWO unit cannot be found an error is thrown. */
4590 static struct dwo_unit *
4591 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
4592 struct die_info *comp_unit_die)
4594 struct dwarf2_cu *cu = this_cu->cu;
4595 struct attribute *attr;
4597 struct dwo_unit *dwo_unit;
4598 const char *comp_dir, *dwo_name;
4600 /* Yeah, we look dwo_name up again, but it simplifies the code. */
4601 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4602 gdb_assert (attr != NULL);
4603 dwo_name = DW_STRING (attr);
4605 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4607 comp_dir = DW_STRING (attr);
4609 if (this_cu->is_debug_types)
4611 struct signatured_type *sig_type;
4613 /* Since this_cu is the first member of struct signatured_type,
4614 we can go from a pointer to one to a pointer to the other. */
4615 sig_type = (struct signatured_type *) this_cu;
4616 signature = sig_type->signature;
4617 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
4621 struct attribute *attr;
4623 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4625 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
4627 dwo_name, this_cu->objfile->name);
4628 signature = DW_UNSND (attr);
4629 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
4633 if (dwo_unit == NULL)
4635 error (_("Dwarf Error: CU at offset 0x%x references unknown DWO"
4636 " with ID %s [in module %s]"),
4637 this_cu->offset.sect_off,
4638 phex (signature, sizeof (signature)),
4639 this_cu->objfile->name);
4645 /* Initialize a CU (or TU) and read its DIEs.
4646 If the CU defers to a DWO file, read the DWO file as well.
4648 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4649 Otherwise the table specified in the comp unit header is read in and used.
4650 This is an optimization for when we already have the abbrev table.
4652 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4653 Otherwise, a new CU is allocated with xmalloc.
4655 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4656 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4658 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4659 linker) then DIE_READER_FUNC will not get called. */
4662 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
4663 struct abbrev_table *abbrev_table,
4664 int use_existing_cu, int keep,
4665 die_reader_func_ftype *die_reader_func,
4668 struct objfile *objfile = dwarf2_per_objfile->objfile;
4669 struct dwarf2_section_info *section = this_cu->section;
4670 bfd *abfd = section->asection->owner;
4671 struct dwarf2_cu *cu;
4672 const gdb_byte *begin_info_ptr, *info_ptr;
4673 struct die_reader_specs reader;
4674 struct die_info *comp_unit_die;
4676 struct attribute *attr;
4677 struct cleanup *cleanups, *free_cu_cleanup = NULL;
4678 struct signatured_type *sig_type = NULL;
4679 struct dwarf2_section_info *abbrev_section;
4680 /* Non-zero if CU currently points to a DWO file and we need to
4681 reread it. When this happens we need to reread the skeleton die
4682 before we can reread the DWO file. */
4683 int rereading_dwo_cu = 0;
4685 if (dwarf2_die_debug)
4686 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4687 this_cu->is_debug_types ? "type" : "comp",
4688 this_cu->offset.sect_off);
4690 if (use_existing_cu)
4693 cleanups = make_cleanup (null_cleanup, NULL);
4695 /* This is cheap if the section is already read in. */
4696 dwarf2_read_section (objfile, section);
4698 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4700 abbrev_section = get_abbrev_section_for_cu (this_cu);
4702 if (use_existing_cu && this_cu->cu != NULL)
4706 /* If this CU is from a DWO file we need to start over, we need to
4707 refetch the attributes from the skeleton CU.
4708 This could be optimized by retrieving those attributes from when we
4709 were here the first time: the previous comp_unit_die was stored in
4710 comp_unit_obstack. But there's no data yet that we need this
4712 if (cu->dwo_unit != NULL)
4713 rereading_dwo_cu = 1;
4717 /* If !use_existing_cu, this_cu->cu must be NULL. */
4718 gdb_assert (this_cu->cu == NULL);
4720 cu = xmalloc (sizeof (*cu));
4721 init_one_comp_unit (cu, this_cu);
4723 /* If an error occurs while loading, release our storage. */
4724 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4727 /* Get the header. */
4728 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
4730 /* We already have the header, there's no need to read it in again. */
4731 info_ptr += cu->header.first_die_offset.cu_off;
4735 if (this_cu->is_debug_types)
4738 cu_offset type_offset_in_tu;
4740 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4741 abbrev_section, info_ptr,
4743 &type_offset_in_tu);
4745 /* Since per_cu is the first member of struct signatured_type,
4746 we can go from a pointer to one to a pointer to the other. */
4747 sig_type = (struct signatured_type *) this_cu;
4748 gdb_assert (sig_type->signature == signature);
4749 gdb_assert (sig_type->type_offset_in_tu.cu_off
4750 == type_offset_in_tu.cu_off);
4751 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4753 /* LENGTH has not been set yet for type units if we're
4754 using .gdb_index. */
4755 this_cu->length = get_cu_length (&cu->header);
4757 /* Establish the type offset that can be used to lookup the type. */
4758 sig_type->type_offset_in_section.sect_off =
4759 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
4763 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4767 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4768 gdb_assert (this_cu->length == get_cu_length (&cu->header));
4772 /* Skip dummy compilation units. */
4773 if (info_ptr >= begin_info_ptr + this_cu->length
4774 || peek_abbrev_code (abfd, info_ptr) == 0)
4776 do_cleanups (cleanups);
4780 /* If we don't have them yet, read the abbrevs for this compilation unit.
4781 And if we need to read them now, make sure they're freed when we're
4782 done. Note that it's important that if the CU had an abbrev table
4783 on entry we don't free it when we're done: Somewhere up the call stack
4784 it may be in use. */
4785 if (abbrev_table != NULL)
4787 gdb_assert (cu->abbrev_table == NULL);
4788 gdb_assert (cu->header.abbrev_offset.sect_off
4789 == abbrev_table->offset.sect_off);
4790 cu->abbrev_table = abbrev_table;
4792 else if (cu->abbrev_table == NULL)
4794 dwarf2_read_abbrevs (cu, abbrev_section);
4795 make_cleanup (dwarf2_free_abbrev_table, cu);
4797 else if (rereading_dwo_cu)
4799 dwarf2_free_abbrev_table (cu);
4800 dwarf2_read_abbrevs (cu, abbrev_section);
4803 /* Read the top level CU/TU die. */
4804 init_cu_die_reader (&reader, cu, section, NULL);
4805 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4807 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
4809 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
4810 DWO CU, that this test will fail (the attribute will not be present). */
4811 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4814 struct dwo_unit *dwo_unit;
4815 struct die_info *dwo_comp_unit_die;
4818 error (_("Dwarf Error: compilation unit with DW_AT_GNU_dwo_name"
4819 " has children (offset 0x%x) [in module %s]"),
4820 this_cu->offset.sect_off, bfd_get_filename (abfd));
4821 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
4822 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
4823 abbrev_table != NULL,
4826 &dwo_comp_unit_die, &has_children) == 0)
4829 do_cleanups (cleanups);
4832 comp_unit_die = dwo_comp_unit_die;
4835 /* All of the above is setup for this call. Yikes. */
4836 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4838 /* Done, clean up. */
4839 if (free_cu_cleanup != NULL)
4843 /* We've successfully allocated this compilation unit. Let our
4844 caller clean it up when finished with it. */
4845 discard_cleanups (free_cu_cleanup);
4847 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4848 So we have to manually free the abbrev table. */
4849 dwarf2_free_abbrev_table (cu);
4851 /* Link this CU into read_in_chain. */
4852 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4853 dwarf2_per_objfile->read_in_chain = this_cu;
4856 do_cleanups (free_cu_cleanup);
4859 do_cleanups (cleanups);
4862 /* Read CU/TU THIS_CU in section SECTION,
4863 but do not follow DW_AT_GNU_dwo_name if present.
4864 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
4865 to have already done the lookup to find the DWO/DWP file).
4867 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
4868 THIS_CU->is_debug_types, but nothing else.
4870 We fill in THIS_CU->length.
4872 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4873 linker) then DIE_READER_FUNC will not get called.
4875 THIS_CU->cu is always freed when done.
4876 This is done in order to not leave THIS_CU->cu in a state where we have
4877 to care whether it refers to the "main" CU or the DWO CU. */
4880 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
4881 struct dwarf2_section_info *abbrev_section,
4882 struct dwo_file *dwo_file,
4883 die_reader_func_ftype *die_reader_func,
4886 struct objfile *objfile = dwarf2_per_objfile->objfile;
4887 struct dwarf2_section_info *section = this_cu->section;
4888 bfd *abfd = section->asection->owner;
4889 struct dwarf2_cu cu;
4890 const gdb_byte *begin_info_ptr, *info_ptr;
4891 struct die_reader_specs reader;
4892 struct cleanup *cleanups;
4893 struct die_info *comp_unit_die;
4896 if (dwarf2_die_debug)
4897 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4898 this_cu->is_debug_types ? "type" : "comp",
4899 this_cu->offset.sect_off);
4901 gdb_assert (this_cu->cu == NULL);
4903 /* This is cheap if the section is already read in. */
4904 dwarf2_read_section (objfile, section);
4906 init_one_comp_unit (&cu, this_cu);
4908 cleanups = make_cleanup (free_stack_comp_unit, &cu);
4910 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4911 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
4912 abbrev_section, info_ptr,
4913 this_cu->is_debug_types);
4915 this_cu->length = get_cu_length (&cu.header);
4917 /* Skip dummy compilation units. */
4918 if (info_ptr >= begin_info_ptr + this_cu->length
4919 || peek_abbrev_code (abfd, info_ptr) == 0)
4921 do_cleanups (cleanups);
4925 dwarf2_read_abbrevs (&cu, abbrev_section);
4926 make_cleanup (dwarf2_free_abbrev_table, &cu);
4928 init_cu_die_reader (&reader, &cu, section, dwo_file);
4929 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4931 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4933 do_cleanups (cleanups);
4936 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
4937 does not lookup the specified DWO file.
4938 This cannot be used to read DWO files.
4940 THIS_CU->cu is always freed when done.
4941 This is done in order to not leave THIS_CU->cu in a state where we have
4942 to care whether it refers to the "main" CU or the DWO CU.
4943 We can revisit this if the data shows there's a performance issue. */
4946 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
4947 die_reader_func_ftype *die_reader_func,
4950 init_cutu_and_read_dies_no_follow (this_cu,
4951 get_abbrev_section_for_cu (this_cu),
4953 die_reader_func, data);
4956 /* Type Unit Groups.
4958 Type Unit Groups are a way to collapse the set of all TUs (type units) into
4959 a more manageable set. The grouping is done by DW_AT_stmt_list entry
4960 so that all types coming from the same compilation (.o file) are grouped
4961 together. A future step could be to put the types in the same symtab as
4962 the CU the types ultimately came from. */
4965 hash_type_unit_group (const void *item)
4967 const struct type_unit_group *tu_group = item;
4969 return hash_stmt_list_entry (&tu_group->hash);
4973 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
4975 const struct type_unit_group *lhs = item_lhs;
4976 const struct type_unit_group *rhs = item_rhs;
4978 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
4981 /* Allocate a hash table for type unit groups. */
4984 allocate_type_unit_groups_table (void)
4986 return htab_create_alloc_ex (3,
4987 hash_type_unit_group,
4990 &dwarf2_per_objfile->objfile->objfile_obstack,
4991 hashtab_obstack_allocate,
4992 dummy_obstack_deallocate);
4995 /* Type units that don't have DW_AT_stmt_list are grouped into their own
4996 partial symtabs. We combine several TUs per psymtab to not let the size
4997 of any one psymtab grow too big. */
4998 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
4999 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5001 /* Helper routine for get_type_unit_group.
5002 Create the type_unit_group object used to hold one or more TUs. */
5004 static struct type_unit_group *
5005 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5007 struct objfile *objfile = dwarf2_per_objfile->objfile;
5008 struct dwarf2_per_cu_data *per_cu;
5009 struct type_unit_group *tu_group;
5011 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5012 struct type_unit_group);
5013 per_cu = &tu_group->per_cu;
5014 per_cu->objfile = objfile;
5016 if (dwarf2_per_objfile->using_index)
5018 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5019 struct dwarf2_per_cu_quick_data);
5023 unsigned int line_offset = line_offset_struct.sect_off;
5024 struct partial_symtab *pst;
5027 /* Give the symtab a useful name for debug purposes. */
5028 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5029 name = xstrprintf ("<type_units_%d>",
5030 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5032 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5034 pst = create_partial_symtab (per_cu, name);
5040 tu_group->hash.dwo_unit = cu->dwo_unit;
5041 tu_group->hash.line_offset = line_offset_struct;
5046 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5047 STMT_LIST is a DW_AT_stmt_list attribute. */
5049 static struct type_unit_group *
5050 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5052 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5053 struct type_unit_group *tu_group;
5055 unsigned int line_offset;
5056 struct type_unit_group type_unit_group_for_lookup;
5058 if (dwarf2_per_objfile->type_unit_groups == NULL)
5060 dwarf2_per_objfile->type_unit_groups =
5061 allocate_type_unit_groups_table ();
5064 /* Do we need to create a new group, or can we use an existing one? */
5068 line_offset = DW_UNSND (stmt_list);
5069 ++tu_stats->nr_symtab_sharers;
5073 /* Ugh, no stmt_list. Rare, but we have to handle it.
5074 We can do various things here like create one group per TU or
5075 spread them over multiple groups to split up the expansion work.
5076 To avoid worst case scenarios (too many groups or too large groups)
5077 we, umm, group them in bunches. */
5078 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5079 | (tu_stats->nr_stmt_less_type_units
5080 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5081 ++tu_stats->nr_stmt_less_type_units;
5084 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5085 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5086 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5087 &type_unit_group_for_lookup, INSERT);
5091 gdb_assert (tu_group != NULL);
5095 sect_offset line_offset_struct;
5097 line_offset_struct.sect_off = line_offset;
5098 tu_group = create_type_unit_group (cu, line_offset_struct);
5100 ++tu_stats->nr_symtabs;
5106 /* Struct used to sort TUs by their abbreviation table offset. */
5108 struct tu_abbrev_offset
5110 struct signatured_type *sig_type;
5111 sect_offset abbrev_offset;
5114 /* Helper routine for build_type_unit_groups, passed to qsort. */
5117 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5119 const struct tu_abbrev_offset * const *a = ap;
5120 const struct tu_abbrev_offset * const *b = bp;
5121 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5122 unsigned int boff = (*b)->abbrev_offset.sect_off;
5124 return (aoff > boff) - (aoff < boff);
5127 /* A helper function to add a type_unit_group to a table. */
5130 add_type_unit_group_to_table (void **slot, void *datum)
5132 struct type_unit_group *tu_group = *slot;
5133 struct type_unit_group ***datap = datum;
5141 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5142 each one passing FUNC,DATA.
5144 The efficiency is because we sort TUs by the abbrev table they use and
5145 only read each abbrev table once. In one program there are 200K TUs
5146 sharing 8K abbrev tables.
5148 The main purpose of this function is to support building the
5149 dwarf2_per_objfile->type_unit_groups table.
5150 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5151 can collapse the search space by grouping them by stmt_list.
5152 The savings can be significant, in the same program from above the 200K TUs
5153 share 8K stmt_list tables.
5155 FUNC is expected to call get_type_unit_group, which will create the
5156 struct type_unit_group if necessary and add it to
5157 dwarf2_per_objfile->type_unit_groups. */
5160 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5162 struct objfile *objfile = dwarf2_per_objfile->objfile;
5163 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5164 struct cleanup *cleanups;
5165 struct abbrev_table *abbrev_table;
5166 sect_offset abbrev_offset;
5167 struct tu_abbrev_offset *sorted_by_abbrev;
5168 struct type_unit_group **iter;
5171 /* It's up to the caller to not call us multiple times. */
5172 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5174 if (dwarf2_per_objfile->n_type_units == 0)
5177 /* TUs typically share abbrev tables, and there can be way more TUs than
5178 abbrev tables. Sort by abbrev table to reduce the number of times we
5179 read each abbrev table in.
5180 Alternatives are to punt or to maintain a cache of abbrev tables.
5181 This is simpler and efficient enough for now.
5183 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5184 symtab to use). Typically TUs with the same abbrev offset have the same
5185 stmt_list value too so in practice this should work well.
5187 The basic algorithm here is:
5189 sort TUs by abbrev table
5190 for each TU with same abbrev table:
5191 read abbrev table if first user
5192 read TU top level DIE
5193 [IWBN if DWO skeletons had DW_AT_stmt_list]
5196 if (dwarf2_read_debug)
5197 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5199 /* Sort in a separate table to maintain the order of all_type_units
5200 for .gdb_index: TU indices directly index all_type_units. */
5201 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5202 dwarf2_per_objfile->n_type_units);
5203 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5205 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5207 sorted_by_abbrev[i].sig_type = sig_type;
5208 sorted_by_abbrev[i].abbrev_offset =
5209 read_abbrev_offset (sig_type->per_cu.section,
5210 sig_type->per_cu.offset);
5212 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5213 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5214 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5216 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5217 called any number of times, so we don't reset tu_stats here. */
5219 abbrev_offset.sect_off = ~(unsigned) 0;
5220 abbrev_table = NULL;
5221 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5223 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5225 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5227 /* Switch to the next abbrev table if necessary. */
5228 if (abbrev_table == NULL
5229 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5231 if (abbrev_table != NULL)
5233 abbrev_table_free (abbrev_table);
5234 /* Reset to NULL in case abbrev_table_read_table throws
5235 an error: abbrev_table_free_cleanup will get called. */
5236 abbrev_table = NULL;
5238 abbrev_offset = tu->abbrev_offset;
5240 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5242 ++tu_stats->nr_uniq_abbrev_tables;
5245 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5249 /* Create a vector of pointers to primary type units to make it easy to
5250 iterate over them and CUs. See dw2_get_primary_cu. */
5251 dwarf2_per_objfile->n_type_unit_groups =
5252 htab_elements (dwarf2_per_objfile->type_unit_groups);
5253 dwarf2_per_objfile->all_type_unit_groups =
5254 obstack_alloc (&objfile->objfile_obstack,
5255 dwarf2_per_objfile->n_type_unit_groups
5256 * sizeof (struct type_unit_group *));
5257 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5258 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5259 add_type_unit_group_to_table, &iter);
5260 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5261 == dwarf2_per_objfile->n_type_unit_groups);
5263 do_cleanups (cleanups);
5265 if (dwarf2_read_debug)
5267 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5268 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5269 dwarf2_per_objfile->n_type_units);
5270 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5271 tu_stats->nr_uniq_abbrev_tables);
5272 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5273 tu_stats->nr_symtabs);
5274 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5275 tu_stats->nr_symtab_sharers);
5276 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5277 tu_stats->nr_stmt_less_type_units);
5281 /* Partial symbol tables. */
5283 /* Create a psymtab named NAME and assign it to PER_CU.
5285 The caller must fill in the following details:
5286 dirname, textlow, texthigh. */
5288 static struct partial_symtab *
5289 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5291 struct objfile *objfile = per_cu->objfile;
5292 struct partial_symtab *pst;
5294 pst = start_psymtab_common (objfile, objfile->section_offsets,
5296 objfile->global_psymbols.next,
5297 objfile->static_psymbols.next);
5299 pst->psymtabs_addrmap_supported = 1;
5301 /* This is the glue that links PST into GDB's symbol API. */
5302 pst->read_symtab_private = per_cu;
5303 pst->read_symtab = dwarf2_read_symtab;
5304 per_cu->v.psymtab = pst;
5309 /* die_reader_func for process_psymtab_comp_unit. */
5312 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5313 const gdb_byte *info_ptr,
5314 struct die_info *comp_unit_die,
5318 struct dwarf2_cu *cu = reader->cu;
5319 struct objfile *objfile = cu->objfile;
5320 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5321 struct attribute *attr;
5323 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5324 struct partial_symtab *pst;
5326 const char *filename;
5327 int *want_partial_unit_ptr = data;
5329 if (comp_unit_die->tag == DW_TAG_partial_unit
5330 && (want_partial_unit_ptr == NULL
5331 || !*want_partial_unit_ptr))
5334 gdb_assert (! per_cu->is_debug_types);
5336 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5338 cu->list_in_scope = &file_symbols;
5340 /* Allocate a new partial symbol table structure. */
5341 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5342 if (attr == NULL || !DW_STRING (attr))
5345 filename = DW_STRING (attr);
5347 pst = create_partial_symtab (per_cu, filename);
5349 /* This must be done before calling dwarf2_build_include_psymtabs. */
5350 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5352 pst->dirname = DW_STRING (attr);
5354 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5356 dwarf2_find_base_address (comp_unit_die, cu);
5358 /* Possibly set the default values of LOWPC and HIGHPC from
5360 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5361 &best_highpc, cu, pst);
5362 if (has_pc_info == 1 && best_lowpc < best_highpc)
5363 /* Store the contiguous range if it is not empty; it can be empty for
5364 CUs with no code. */
5365 addrmap_set_empty (objfile->psymtabs_addrmap,
5366 best_lowpc + baseaddr,
5367 best_highpc + baseaddr - 1, pst);
5369 /* Check if comp unit has_children.
5370 If so, read the rest of the partial symbols from this comp unit.
5371 If not, there's no more debug_info for this comp unit. */
5374 struct partial_die_info *first_die;
5375 CORE_ADDR lowpc, highpc;
5377 lowpc = ((CORE_ADDR) -1);
5378 highpc = ((CORE_ADDR) 0);
5380 first_die = load_partial_dies (reader, info_ptr, 1);
5382 scan_partial_symbols (first_die, &lowpc, &highpc,
5385 /* If we didn't find a lowpc, set it to highpc to avoid
5386 complaints from `maint check'. */
5387 if (lowpc == ((CORE_ADDR) -1))
5390 /* If the compilation unit didn't have an explicit address range,
5391 then use the information extracted from its child dies. */
5395 best_highpc = highpc;
5398 pst->textlow = best_lowpc + baseaddr;
5399 pst->texthigh = best_highpc + baseaddr;
5401 pst->n_global_syms = objfile->global_psymbols.next -
5402 (objfile->global_psymbols.list + pst->globals_offset);
5403 pst->n_static_syms = objfile->static_psymbols.next -
5404 (objfile->static_psymbols.list + pst->statics_offset);
5405 sort_pst_symbols (objfile, pst);
5407 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5410 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5411 struct dwarf2_per_cu_data *iter;
5413 /* Fill in 'dependencies' here; we fill in 'users' in a
5415 pst->number_of_dependencies = len;
5416 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5417 len * sizeof (struct symtab *));
5419 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5422 pst->dependencies[i] = iter->v.psymtab;
5424 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5427 /* Get the list of files included in the current compilation unit,
5428 and build a psymtab for each of them. */
5429 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5431 if (dwarf2_read_debug)
5433 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5435 fprintf_unfiltered (gdb_stdlog,
5436 "Psymtab for %s unit @0x%x: %s - %s"
5437 ", %d global, %d static syms\n",
5438 per_cu->is_debug_types ? "type" : "comp",
5439 per_cu->offset.sect_off,
5440 paddress (gdbarch, pst->textlow),
5441 paddress (gdbarch, pst->texthigh),
5442 pst->n_global_syms, pst->n_static_syms);
5446 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5447 Process compilation unit THIS_CU for a psymtab. */
5450 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5451 int want_partial_unit)
5453 /* If this compilation unit was already read in, free the
5454 cached copy in order to read it in again. This is
5455 necessary because we skipped some symbols when we first
5456 read in the compilation unit (see load_partial_dies).
5457 This problem could be avoided, but the benefit is unclear. */
5458 if (this_cu->cu != NULL)
5459 free_one_cached_comp_unit (this_cu);
5461 gdb_assert (! this_cu->is_debug_types);
5462 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5463 process_psymtab_comp_unit_reader,
5464 &want_partial_unit);
5466 /* Age out any secondary CUs. */
5467 age_cached_comp_units ();
5470 /* Reader function for build_type_psymtabs. */
5473 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5474 const gdb_byte *info_ptr,
5475 struct die_info *type_unit_die,
5479 struct objfile *objfile = dwarf2_per_objfile->objfile;
5480 struct dwarf2_cu *cu = reader->cu;
5481 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5482 struct signatured_type *sig_type;
5483 struct type_unit_group *tu_group;
5484 struct attribute *attr;
5485 struct partial_die_info *first_die;
5486 CORE_ADDR lowpc, highpc;
5487 struct partial_symtab *pst;
5489 gdb_assert (data == NULL);
5490 gdb_assert (per_cu->is_debug_types);
5491 sig_type = (struct signatured_type *) per_cu;
5496 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5497 tu_group = get_type_unit_group (cu, attr);
5499 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5501 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5502 cu->list_in_scope = &file_symbols;
5503 pst = create_partial_symtab (per_cu, "");
5506 first_die = load_partial_dies (reader, info_ptr, 1);
5508 lowpc = (CORE_ADDR) -1;
5509 highpc = (CORE_ADDR) 0;
5510 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5512 pst->n_global_syms = objfile->global_psymbols.next -
5513 (objfile->global_psymbols.list + pst->globals_offset);
5514 pst->n_static_syms = objfile->static_psymbols.next -
5515 (objfile->static_psymbols.list + pst->statics_offset);
5516 sort_pst_symbols (objfile, pst);
5519 /* Traversal function for build_type_psymtabs. */
5522 build_type_psymtab_dependencies (void **slot, void *info)
5524 struct objfile *objfile = dwarf2_per_objfile->objfile;
5525 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5526 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5527 struct partial_symtab *pst = per_cu->v.psymtab;
5528 int len = VEC_length (sig_type_ptr, tu_group->tus);
5529 struct signatured_type *iter;
5532 gdb_assert (len > 0);
5533 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5535 pst->number_of_dependencies = len;
5536 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5537 len * sizeof (struct psymtab *));
5539 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5542 gdb_assert (iter->per_cu.is_debug_types);
5543 pst->dependencies[i] = iter->per_cu.v.psymtab;
5544 iter->type_unit_group = tu_group;
5547 VEC_free (sig_type_ptr, tu_group->tus);
5552 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5553 Build partial symbol tables for the .debug_types comp-units. */
5556 build_type_psymtabs (struct objfile *objfile)
5558 if (! create_all_type_units (objfile))
5561 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5563 /* Now that all TUs have been processed we can fill in the dependencies. */
5564 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5565 build_type_psymtab_dependencies, NULL);
5568 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5571 psymtabs_addrmap_cleanup (void *o)
5573 struct objfile *objfile = o;
5575 objfile->psymtabs_addrmap = NULL;
5578 /* Compute the 'user' field for each psymtab in OBJFILE. */
5581 set_partial_user (struct objfile *objfile)
5585 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5587 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5588 struct partial_symtab *pst = per_cu->v.psymtab;
5594 for (j = 0; j < pst->number_of_dependencies; ++j)
5596 /* Set the 'user' field only if it is not already set. */
5597 if (pst->dependencies[j]->user == NULL)
5598 pst->dependencies[j]->user = pst;
5603 /* Build the partial symbol table by doing a quick pass through the
5604 .debug_info and .debug_abbrev sections. */
5607 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5609 struct cleanup *back_to, *addrmap_cleanup;
5610 struct obstack temp_obstack;
5613 if (dwarf2_read_debug)
5615 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5619 dwarf2_per_objfile->reading_partial_symbols = 1;
5621 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5623 /* Any cached compilation units will be linked by the per-objfile
5624 read_in_chain. Make sure to free them when we're done. */
5625 back_to = make_cleanup (free_cached_comp_units, NULL);
5627 build_type_psymtabs (objfile);
5629 create_all_comp_units (objfile);
5631 /* Create a temporary address map on a temporary obstack. We later
5632 copy this to the final obstack. */
5633 obstack_init (&temp_obstack);
5634 make_cleanup_obstack_free (&temp_obstack);
5635 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
5636 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
5638 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5640 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5642 process_psymtab_comp_unit (per_cu, 0);
5645 set_partial_user (objfile);
5647 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
5648 &objfile->objfile_obstack);
5649 discard_cleanups (addrmap_cleanup);
5651 do_cleanups (back_to);
5653 if (dwarf2_read_debug)
5654 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
5658 /* die_reader_func for load_partial_comp_unit. */
5661 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
5662 const gdb_byte *info_ptr,
5663 struct die_info *comp_unit_die,
5667 struct dwarf2_cu *cu = reader->cu;
5669 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5671 /* Check if comp unit has_children.
5672 If so, read the rest of the partial symbols from this comp unit.
5673 If not, there's no more debug_info for this comp unit. */
5675 load_partial_dies (reader, info_ptr, 0);
5678 /* Load the partial DIEs for a secondary CU into memory.
5679 This is also used when rereading a primary CU with load_all_dies. */
5682 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
5684 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
5685 load_partial_comp_unit_reader, NULL);
5689 read_comp_units_from_section (struct objfile *objfile,
5690 struct dwarf2_section_info *section,
5691 unsigned int is_dwz,
5694 struct dwarf2_per_cu_data ***all_comp_units)
5696 const gdb_byte *info_ptr;
5697 bfd *abfd = section->asection->owner;
5699 if (dwarf2_read_debug)
5700 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
5701 section->asection->name, bfd_get_filename (abfd));
5703 dwarf2_read_section (objfile, section);
5705 info_ptr = section->buffer;
5707 while (info_ptr < section->buffer + section->size)
5709 unsigned int length, initial_length_size;
5710 struct dwarf2_per_cu_data *this_cu;
5713 offset.sect_off = info_ptr - section->buffer;
5715 /* Read just enough information to find out where the next
5716 compilation unit is. */
5717 length = read_initial_length (abfd, info_ptr, &initial_length_size);
5719 /* Save the compilation unit for later lookup. */
5720 this_cu = obstack_alloc (&objfile->objfile_obstack,
5721 sizeof (struct dwarf2_per_cu_data));
5722 memset (this_cu, 0, sizeof (*this_cu));
5723 this_cu->offset = offset;
5724 this_cu->length = length + initial_length_size;
5725 this_cu->is_dwz = is_dwz;
5726 this_cu->objfile = objfile;
5727 this_cu->section = section;
5729 if (*n_comp_units == *n_allocated)
5732 *all_comp_units = xrealloc (*all_comp_units,
5734 * sizeof (struct dwarf2_per_cu_data *));
5736 (*all_comp_units)[*n_comp_units] = this_cu;
5739 info_ptr = info_ptr + this_cu->length;
5743 /* Create a list of all compilation units in OBJFILE.
5744 This is only done for -readnow and building partial symtabs. */
5747 create_all_comp_units (struct objfile *objfile)
5751 struct dwarf2_per_cu_data **all_comp_units;
5755 all_comp_units = xmalloc (n_allocated
5756 * sizeof (struct dwarf2_per_cu_data *));
5758 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
5759 &n_allocated, &n_comp_units, &all_comp_units);
5761 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
5763 struct dwz_file *dwz = dwarf2_get_dwz_file ();
5765 read_comp_units_from_section (objfile, &dwz->info, 1,
5766 &n_allocated, &n_comp_units,
5770 dwarf2_per_objfile->all_comp_units
5771 = obstack_alloc (&objfile->objfile_obstack,
5772 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5773 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
5774 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5775 xfree (all_comp_units);
5776 dwarf2_per_objfile->n_comp_units = n_comp_units;
5779 /* Process all loaded DIEs for compilation unit CU, starting at
5780 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
5781 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
5782 DW_AT_ranges). If NEED_PC is set, then this function will set
5783 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
5784 and record the covered ranges in the addrmap. */
5787 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
5788 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
5790 struct partial_die_info *pdi;
5792 /* Now, march along the PDI's, descending into ones which have
5793 interesting children but skipping the children of the other ones,
5794 until we reach the end of the compilation unit. */
5800 fixup_partial_die (pdi, cu);
5802 /* Anonymous namespaces or modules have no name but have interesting
5803 children, so we need to look at them. Ditto for anonymous
5806 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
5807 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
5808 || pdi->tag == DW_TAG_imported_unit)
5812 case DW_TAG_subprogram:
5813 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
5815 case DW_TAG_constant:
5816 case DW_TAG_variable:
5817 case DW_TAG_typedef:
5818 case DW_TAG_union_type:
5819 if (!pdi->is_declaration)
5821 add_partial_symbol (pdi, cu);
5824 case DW_TAG_class_type:
5825 case DW_TAG_interface_type:
5826 case DW_TAG_structure_type:
5827 if (!pdi->is_declaration)
5829 add_partial_symbol (pdi, cu);
5832 case DW_TAG_enumeration_type:
5833 if (!pdi->is_declaration)
5834 add_partial_enumeration (pdi, cu);
5836 case DW_TAG_base_type:
5837 case DW_TAG_subrange_type:
5838 /* File scope base type definitions are added to the partial
5840 add_partial_symbol (pdi, cu);
5842 case DW_TAG_namespace:
5843 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
5846 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
5848 case DW_TAG_imported_unit:
5850 struct dwarf2_per_cu_data *per_cu;
5852 /* For now we don't handle imported units in type units. */
5853 if (cu->per_cu->is_debug_types)
5855 error (_("Dwarf Error: DW_TAG_imported_unit is not"
5856 " supported in type units [in module %s]"),
5860 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
5864 /* Go read the partial unit, if needed. */
5865 if (per_cu->v.psymtab == NULL)
5866 process_psymtab_comp_unit (per_cu, 1);
5868 VEC_safe_push (dwarf2_per_cu_ptr,
5869 cu->per_cu->imported_symtabs, per_cu);
5877 /* If the die has a sibling, skip to the sibling. */
5879 pdi = pdi->die_sibling;
5883 /* Functions used to compute the fully scoped name of a partial DIE.
5885 Normally, this is simple. For C++, the parent DIE's fully scoped
5886 name is concatenated with "::" and the partial DIE's name. For
5887 Java, the same thing occurs except that "." is used instead of "::".
5888 Enumerators are an exception; they use the scope of their parent
5889 enumeration type, i.e. the name of the enumeration type is not
5890 prepended to the enumerator.
5892 There are two complexities. One is DW_AT_specification; in this
5893 case "parent" means the parent of the target of the specification,
5894 instead of the direct parent of the DIE. The other is compilers
5895 which do not emit DW_TAG_namespace; in this case we try to guess
5896 the fully qualified name of structure types from their members'
5897 linkage names. This must be done using the DIE's children rather
5898 than the children of any DW_AT_specification target. We only need
5899 to do this for structures at the top level, i.e. if the target of
5900 any DW_AT_specification (if any; otherwise the DIE itself) does not
5903 /* Compute the scope prefix associated with PDI's parent, in
5904 compilation unit CU. The result will be allocated on CU's
5905 comp_unit_obstack, or a copy of the already allocated PDI->NAME
5906 field. NULL is returned if no prefix is necessary. */
5908 partial_die_parent_scope (struct partial_die_info *pdi,
5909 struct dwarf2_cu *cu)
5911 const char *grandparent_scope;
5912 struct partial_die_info *parent, *real_pdi;
5914 /* We need to look at our parent DIE; if we have a DW_AT_specification,
5915 then this means the parent of the specification DIE. */
5918 while (real_pdi->has_specification)
5919 real_pdi = find_partial_die (real_pdi->spec_offset,
5920 real_pdi->spec_is_dwz, cu);
5922 parent = real_pdi->die_parent;
5926 if (parent->scope_set)
5927 return parent->scope;
5929 fixup_partial_die (parent, cu);
5931 grandparent_scope = partial_die_parent_scope (parent, cu);
5933 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
5934 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
5935 Work around this problem here. */
5936 if (cu->language == language_cplus
5937 && parent->tag == DW_TAG_namespace
5938 && strcmp (parent->name, "::") == 0
5939 && grandparent_scope == NULL)
5941 parent->scope = NULL;
5942 parent->scope_set = 1;
5946 if (pdi->tag == DW_TAG_enumerator)
5947 /* Enumerators should not get the name of the enumeration as a prefix. */
5948 parent->scope = grandparent_scope;
5949 else if (parent->tag == DW_TAG_namespace
5950 || parent->tag == DW_TAG_module
5951 || parent->tag == DW_TAG_structure_type
5952 || parent->tag == DW_TAG_class_type
5953 || parent->tag == DW_TAG_interface_type
5954 || parent->tag == DW_TAG_union_type
5955 || parent->tag == DW_TAG_enumeration_type)
5957 if (grandparent_scope == NULL)
5958 parent->scope = parent->name;
5960 parent->scope = typename_concat (&cu->comp_unit_obstack,
5962 parent->name, 0, cu);
5966 /* FIXME drow/2004-04-01: What should we be doing with
5967 function-local names? For partial symbols, we should probably be
5969 complaint (&symfile_complaints,
5970 _("unhandled containing DIE tag %d for DIE at %d"),
5971 parent->tag, pdi->offset.sect_off);
5972 parent->scope = grandparent_scope;
5975 parent->scope_set = 1;
5976 return parent->scope;
5979 /* Return the fully scoped name associated with PDI, from compilation unit
5980 CU. The result will be allocated with malloc. */
5983 partial_die_full_name (struct partial_die_info *pdi,
5984 struct dwarf2_cu *cu)
5986 const char *parent_scope;
5988 /* If this is a template instantiation, we can not work out the
5989 template arguments from partial DIEs. So, unfortunately, we have
5990 to go through the full DIEs. At least any work we do building
5991 types here will be reused if full symbols are loaded later. */
5992 if (pdi->has_template_arguments)
5994 fixup_partial_die (pdi, cu);
5996 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
5998 struct die_info *die;
5999 struct attribute attr;
6000 struct dwarf2_cu *ref_cu = cu;
6002 /* DW_FORM_ref_addr is using section offset. */
6004 attr.form = DW_FORM_ref_addr;
6005 attr.u.unsnd = pdi->offset.sect_off;
6006 die = follow_die_ref (NULL, &attr, &ref_cu);
6008 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6012 parent_scope = partial_die_parent_scope (pdi, cu);
6013 if (parent_scope == NULL)
6016 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6020 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6022 struct objfile *objfile = cu->objfile;
6024 const char *actual_name = NULL;
6026 char *built_actual_name;
6028 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6030 built_actual_name = partial_die_full_name (pdi, cu);
6031 if (built_actual_name != NULL)
6032 actual_name = built_actual_name;
6034 if (actual_name == NULL)
6035 actual_name = pdi->name;
6039 case DW_TAG_subprogram:
6040 if (pdi->is_external || cu->language == language_ada)
6042 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6043 of the global scope. But in Ada, we want to be able to access
6044 nested procedures globally. So all Ada subprograms are stored
6045 in the global scope. */
6046 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6047 mst_text, objfile); */
6048 add_psymbol_to_list (actual_name, strlen (actual_name),
6049 built_actual_name != NULL,
6050 VAR_DOMAIN, LOC_BLOCK,
6051 &objfile->global_psymbols,
6052 0, pdi->lowpc + baseaddr,
6053 cu->language, objfile);
6057 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6058 mst_file_text, objfile); */
6059 add_psymbol_to_list (actual_name, strlen (actual_name),
6060 built_actual_name != NULL,
6061 VAR_DOMAIN, LOC_BLOCK,
6062 &objfile->static_psymbols,
6063 0, pdi->lowpc + baseaddr,
6064 cu->language, objfile);
6067 case DW_TAG_constant:
6069 struct psymbol_allocation_list *list;
6071 if (pdi->is_external)
6072 list = &objfile->global_psymbols;
6074 list = &objfile->static_psymbols;
6075 add_psymbol_to_list (actual_name, strlen (actual_name),
6076 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6077 list, 0, 0, cu->language, objfile);
6080 case DW_TAG_variable:
6082 addr = decode_locdesc (pdi->d.locdesc, cu);
6086 && !dwarf2_per_objfile->has_section_at_zero)
6088 /* A global or static variable may also have been stripped
6089 out by the linker if unused, in which case its address
6090 will be nullified; do not add such variables into partial
6091 symbol table then. */
6093 else if (pdi->is_external)
6096 Don't enter into the minimal symbol tables as there is
6097 a minimal symbol table entry from the ELF symbols already.
6098 Enter into partial symbol table if it has a location
6099 descriptor or a type.
6100 If the location descriptor is missing, new_symbol will create
6101 a LOC_UNRESOLVED symbol, the address of the variable will then
6102 be determined from the minimal symbol table whenever the variable
6104 The address for the partial symbol table entry is not
6105 used by GDB, but it comes in handy for debugging partial symbol
6108 if (pdi->d.locdesc || pdi->has_type)
6109 add_psymbol_to_list (actual_name, strlen (actual_name),
6110 built_actual_name != NULL,
6111 VAR_DOMAIN, LOC_STATIC,
6112 &objfile->global_psymbols,
6114 cu->language, objfile);
6118 /* Static Variable. Skip symbols without location descriptors. */
6119 if (pdi->d.locdesc == NULL)
6121 xfree (built_actual_name);
6124 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6125 mst_file_data, objfile); */
6126 add_psymbol_to_list (actual_name, strlen (actual_name),
6127 built_actual_name != NULL,
6128 VAR_DOMAIN, LOC_STATIC,
6129 &objfile->static_psymbols,
6131 cu->language, objfile);
6134 case DW_TAG_typedef:
6135 case DW_TAG_base_type:
6136 case DW_TAG_subrange_type:
6137 add_psymbol_to_list (actual_name, strlen (actual_name),
6138 built_actual_name != NULL,
6139 VAR_DOMAIN, LOC_TYPEDEF,
6140 &objfile->static_psymbols,
6141 0, (CORE_ADDR) 0, cu->language, objfile);
6143 case DW_TAG_namespace:
6144 add_psymbol_to_list (actual_name, strlen (actual_name),
6145 built_actual_name != NULL,
6146 VAR_DOMAIN, LOC_TYPEDEF,
6147 &objfile->global_psymbols,
6148 0, (CORE_ADDR) 0, cu->language, objfile);
6150 case DW_TAG_class_type:
6151 case DW_TAG_interface_type:
6152 case DW_TAG_structure_type:
6153 case DW_TAG_union_type:
6154 case DW_TAG_enumeration_type:
6155 /* Skip external references. The DWARF standard says in the section
6156 about "Structure, Union, and Class Type Entries": "An incomplete
6157 structure, union or class type is represented by a structure,
6158 union or class entry that does not have a byte size attribute
6159 and that has a DW_AT_declaration attribute." */
6160 if (!pdi->has_byte_size && pdi->is_declaration)
6162 xfree (built_actual_name);
6166 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6167 static vs. global. */
6168 add_psymbol_to_list (actual_name, strlen (actual_name),
6169 built_actual_name != NULL,
6170 STRUCT_DOMAIN, LOC_TYPEDEF,
6171 (cu->language == language_cplus
6172 || cu->language == language_java)
6173 ? &objfile->global_psymbols
6174 : &objfile->static_psymbols,
6175 0, (CORE_ADDR) 0, cu->language, objfile);
6178 case DW_TAG_enumerator:
6179 add_psymbol_to_list (actual_name, strlen (actual_name),
6180 built_actual_name != NULL,
6181 VAR_DOMAIN, LOC_CONST,
6182 (cu->language == language_cplus
6183 || cu->language == language_java)
6184 ? &objfile->global_psymbols
6185 : &objfile->static_psymbols,
6186 0, (CORE_ADDR) 0, cu->language, objfile);
6192 xfree (built_actual_name);
6195 /* Read a partial die corresponding to a namespace; also, add a symbol
6196 corresponding to that namespace to the symbol table. NAMESPACE is
6197 the name of the enclosing namespace. */
6200 add_partial_namespace (struct partial_die_info *pdi,
6201 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6202 int need_pc, struct dwarf2_cu *cu)
6204 /* Add a symbol for the namespace. */
6206 add_partial_symbol (pdi, cu);
6208 /* Now scan partial symbols in that namespace. */
6210 if (pdi->has_children)
6211 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6214 /* Read a partial die corresponding to a Fortran module. */
6217 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6218 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6220 /* Now scan partial symbols in that module. */
6222 if (pdi->has_children)
6223 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6226 /* Read a partial die corresponding to a subprogram and create a partial
6227 symbol for that subprogram. When the CU language allows it, this
6228 routine also defines a partial symbol for each nested subprogram
6229 that this subprogram contains.
6231 DIE my also be a lexical block, in which case we simply search
6232 recursively for suprograms defined inside that lexical block.
6233 Again, this is only performed when the CU language allows this
6234 type of definitions. */
6237 add_partial_subprogram (struct partial_die_info *pdi,
6238 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6239 int need_pc, struct dwarf2_cu *cu)
6241 if (pdi->tag == DW_TAG_subprogram)
6243 if (pdi->has_pc_info)
6245 if (pdi->lowpc < *lowpc)
6246 *lowpc = pdi->lowpc;
6247 if (pdi->highpc > *highpc)
6248 *highpc = pdi->highpc;
6252 struct objfile *objfile = cu->objfile;
6254 baseaddr = ANOFFSET (objfile->section_offsets,
6255 SECT_OFF_TEXT (objfile));
6256 addrmap_set_empty (objfile->psymtabs_addrmap,
6257 pdi->lowpc + baseaddr,
6258 pdi->highpc - 1 + baseaddr,
6259 cu->per_cu->v.psymtab);
6263 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6265 if (!pdi->is_declaration)
6266 /* Ignore subprogram DIEs that do not have a name, they are
6267 illegal. Do not emit a complaint at this point, we will
6268 do so when we convert this psymtab into a symtab. */
6270 add_partial_symbol (pdi, cu);
6274 if (! pdi->has_children)
6277 if (cu->language == language_ada)
6279 pdi = pdi->die_child;
6282 fixup_partial_die (pdi, cu);
6283 if (pdi->tag == DW_TAG_subprogram
6284 || pdi->tag == DW_TAG_lexical_block)
6285 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6286 pdi = pdi->die_sibling;
6291 /* Read a partial die corresponding to an enumeration type. */
6294 add_partial_enumeration (struct partial_die_info *enum_pdi,
6295 struct dwarf2_cu *cu)
6297 struct partial_die_info *pdi;
6299 if (enum_pdi->name != NULL)
6300 add_partial_symbol (enum_pdi, cu);
6302 pdi = enum_pdi->die_child;
6305 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6306 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6308 add_partial_symbol (pdi, cu);
6309 pdi = pdi->die_sibling;
6313 /* Return the initial uleb128 in the die at INFO_PTR. */
6316 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6318 unsigned int bytes_read;
6320 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6323 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6324 Return the corresponding abbrev, or NULL if the number is zero (indicating
6325 an empty DIE). In either case *BYTES_READ will be set to the length of
6326 the initial number. */
6328 static struct abbrev_info *
6329 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6330 struct dwarf2_cu *cu)
6332 bfd *abfd = cu->objfile->obfd;
6333 unsigned int abbrev_number;
6334 struct abbrev_info *abbrev;
6336 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6338 if (abbrev_number == 0)
6341 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6344 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6345 abbrev_number, bfd_get_filename (abfd));
6351 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6352 Returns a pointer to the end of a series of DIEs, terminated by an empty
6353 DIE. Any children of the skipped DIEs will also be skipped. */
6355 static const gdb_byte *
6356 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6358 struct dwarf2_cu *cu = reader->cu;
6359 struct abbrev_info *abbrev;
6360 unsigned int bytes_read;
6364 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6366 return info_ptr + bytes_read;
6368 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6372 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6373 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6374 abbrev corresponding to that skipped uleb128 should be passed in
6375 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6378 static const gdb_byte *
6379 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6380 struct abbrev_info *abbrev)
6382 unsigned int bytes_read;
6383 struct attribute attr;
6384 bfd *abfd = reader->abfd;
6385 struct dwarf2_cu *cu = reader->cu;
6386 const gdb_byte *buffer = reader->buffer;
6387 const gdb_byte *buffer_end = reader->buffer_end;
6388 const gdb_byte *start_info_ptr = info_ptr;
6389 unsigned int form, i;
6391 for (i = 0; i < abbrev->num_attrs; i++)
6393 /* The only abbrev we care about is DW_AT_sibling. */
6394 if (abbrev->attrs[i].name == DW_AT_sibling)
6396 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6397 if (attr.form == DW_FORM_ref_addr)
6398 complaint (&symfile_complaints,
6399 _("ignoring absolute DW_AT_sibling"));
6401 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6404 /* If it isn't DW_AT_sibling, skip this attribute. */
6405 form = abbrev->attrs[i].form;
6409 case DW_FORM_ref_addr:
6410 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6411 and later it is offset sized. */
6412 if (cu->header.version == 2)
6413 info_ptr += cu->header.addr_size;
6415 info_ptr += cu->header.offset_size;
6417 case DW_FORM_GNU_ref_alt:
6418 info_ptr += cu->header.offset_size;
6421 info_ptr += cu->header.addr_size;
6428 case DW_FORM_flag_present:
6440 case DW_FORM_ref_sig8:
6443 case DW_FORM_string:
6444 read_direct_string (abfd, info_ptr, &bytes_read);
6445 info_ptr += bytes_read;
6447 case DW_FORM_sec_offset:
6449 case DW_FORM_GNU_strp_alt:
6450 info_ptr += cu->header.offset_size;
6452 case DW_FORM_exprloc:
6454 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6455 info_ptr += bytes_read;
6457 case DW_FORM_block1:
6458 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6460 case DW_FORM_block2:
6461 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6463 case DW_FORM_block4:
6464 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6468 case DW_FORM_ref_udata:
6469 case DW_FORM_GNU_addr_index:
6470 case DW_FORM_GNU_str_index:
6471 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6473 case DW_FORM_indirect:
6474 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6475 info_ptr += bytes_read;
6476 /* We need to continue parsing from here, so just go back to
6478 goto skip_attribute;
6481 error (_("Dwarf Error: Cannot handle %s "
6482 "in DWARF reader [in module %s]"),
6483 dwarf_form_name (form),
6484 bfd_get_filename (abfd));
6488 if (abbrev->has_children)
6489 return skip_children (reader, info_ptr);
6494 /* Locate ORIG_PDI's sibling.
6495 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6497 static const gdb_byte *
6498 locate_pdi_sibling (const struct die_reader_specs *reader,
6499 struct partial_die_info *orig_pdi,
6500 const gdb_byte *info_ptr)
6502 /* Do we know the sibling already? */
6504 if (orig_pdi->sibling)
6505 return orig_pdi->sibling;
6507 /* Are there any children to deal with? */
6509 if (!orig_pdi->has_children)
6512 /* Skip the children the long way. */
6514 return skip_children (reader, info_ptr);
6517 /* Expand this partial symbol table into a full symbol table. SELF is
6521 dwarf2_read_symtab (struct partial_symtab *self,
6522 struct objfile *objfile)
6526 warning (_("bug: psymtab for %s is already read in."),
6533 printf_filtered (_("Reading in symbols for %s..."),
6535 gdb_flush (gdb_stdout);
6538 /* Restore our global data. */
6539 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6541 /* If this psymtab is constructed from a debug-only objfile, the
6542 has_section_at_zero flag will not necessarily be correct. We
6543 can get the correct value for this flag by looking at the data
6544 associated with the (presumably stripped) associated objfile. */
6545 if (objfile->separate_debug_objfile_backlink)
6547 struct dwarf2_per_objfile *dpo_backlink
6548 = objfile_data (objfile->separate_debug_objfile_backlink,
6549 dwarf2_objfile_data_key);
6551 dwarf2_per_objfile->has_section_at_zero
6552 = dpo_backlink->has_section_at_zero;
6555 dwarf2_per_objfile->reading_partial_symbols = 0;
6557 psymtab_to_symtab_1 (self);
6559 /* Finish up the debug error message. */
6561 printf_filtered (_("done.\n"));
6564 process_cu_includes ();
6567 /* Reading in full CUs. */
6569 /* Add PER_CU to the queue. */
6572 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6573 enum language pretend_language)
6575 struct dwarf2_queue_item *item;
6578 item = xmalloc (sizeof (*item));
6579 item->per_cu = per_cu;
6580 item->pretend_language = pretend_language;
6583 if (dwarf2_queue == NULL)
6584 dwarf2_queue = item;
6586 dwarf2_queue_tail->next = item;
6588 dwarf2_queue_tail = item;
6591 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6592 unit and add it to our queue.
6593 The result is non-zero if PER_CU was queued, otherwise the result is zero
6594 meaning either PER_CU is already queued or it is already loaded. */
6597 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6598 struct dwarf2_per_cu_data *per_cu,
6599 enum language pretend_language)
6601 /* We may arrive here during partial symbol reading, if we need full
6602 DIEs to process an unusual case (e.g. template arguments). Do
6603 not queue PER_CU, just tell our caller to load its DIEs. */
6604 if (dwarf2_per_objfile->reading_partial_symbols)
6606 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6611 /* Mark the dependence relation so that we don't flush PER_CU
6613 dwarf2_add_dependence (this_cu, per_cu);
6615 /* If it's already on the queue, we have nothing to do. */
6619 /* If the compilation unit is already loaded, just mark it as
6621 if (per_cu->cu != NULL)
6623 per_cu->cu->last_used = 0;
6627 /* Add it to the queue. */
6628 queue_comp_unit (per_cu, pretend_language);
6633 /* Process the queue. */
6636 process_queue (void)
6638 struct dwarf2_queue_item *item, *next_item;
6640 if (dwarf2_read_debug)
6642 fprintf_unfiltered (gdb_stdlog,
6643 "Expanding one or more symtabs of objfile %s ...\n",
6644 dwarf2_per_objfile->objfile->name);
6647 /* The queue starts out with one item, but following a DIE reference
6648 may load a new CU, adding it to the end of the queue. */
6649 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
6651 if (dwarf2_per_objfile->using_index
6652 ? !item->per_cu->v.quick->symtab
6653 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
6655 struct dwarf2_per_cu_data *per_cu = item->per_cu;
6657 if (dwarf2_read_debug)
6659 fprintf_unfiltered (gdb_stdlog,
6660 "Expanding symtab of %s at offset 0x%x\n",
6661 per_cu->is_debug_types ? "TU" : "CU",
6662 per_cu->offset.sect_off);
6665 if (per_cu->is_debug_types)
6666 process_full_type_unit (per_cu, item->pretend_language);
6668 process_full_comp_unit (per_cu, item->pretend_language);
6670 if (dwarf2_read_debug)
6672 fprintf_unfiltered (gdb_stdlog,
6673 "Done expanding %s at offset 0x%x\n",
6674 per_cu->is_debug_types ? "TU" : "CU",
6675 per_cu->offset.sect_off);
6679 item->per_cu->queued = 0;
6680 next_item = item->next;
6684 dwarf2_queue_tail = NULL;
6686 if (dwarf2_read_debug)
6688 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
6689 dwarf2_per_objfile->objfile->name);
6693 /* Free all allocated queue entries. This function only releases anything if
6694 an error was thrown; if the queue was processed then it would have been
6695 freed as we went along. */
6698 dwarf2_release_queue (void *dummy)
6700 struct dwarf2_queue_item *item, *last;
6702 item = dwarf2_queue;
6705 /* Anything still marked queued is likely to be in an
6706 inconsistent state, so discard it. */
6707 if (item->per_cu->queued)
6709 if (item->per_cu->cu != NULL)
6710 free_one_cached_comp_unit (item->per_cu);
6711 item->per_cu->queued = 0;
6719 dwarf2_queue = dwarf2_queue_tail = NULL;
6722 /* Read in full symbols for PST, and anything it depends on. */
6725 psymtab_to_symtab_1 (struct partial_symtab *pst)
6727 struct dwarf2_per_cu_data *per_cu;
6733 for (i = 0; i < pst->number_of_dependencies; i++)
6734 if (!pst->dependencies[i]->readin
6735 && pst->dependencies[i]->user == NULL)
6737 /* Inform about additional files that need to be read in. */
6740 /* FIXME: i18n: Need to make this a single string. */
6741 fputs_filtered (" ", gdb_stdout);
6743 fputs_filtered ("and ", gdb_stdout);
6745 printf_filtered ("%s...", pst->dependencies[i]->filename);
6746 wrap_here (""); /* Flush output. */
6747 gdb_flush (gdb_stdout);
6749 psymtab_to_symtab_1 (pst->dependencies[i]);
6752 per_cu = pst->read_symtab_private;
6756 /* It's an include file, no symbols to read for it.
6757 Everything is in the parent symtab. */
6762 dw2_do_instantiate_symtab (per_cu);
6765 /* Trivial hash function for die_info: the hash value of a DIE
6766 is its offset in .debug_info for this objfile. */
6769 die_hash (const void *item)
6771 const struct die_info *die = item;
6773 return die->offset.sect_off;
6776 /* Trivial comparison function for die_info structures: two DIEs
6777 are equal if they have the same offset. */
6780 die_eq (const void *item_lhs, const void *item_rhs)
6782 const struct die_info *die_lhs = item_lhs;
6783 const struct die_info *die_rhs = item_rhs;
6785 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
6788 /* die_reader_func for load_full_comp_unit.
6789 This is identical to read_signatured_type_reader,
6790 but is kept separate for now. */
6793 load_full_comp_unit_reader (const struct die_reader_specs *reader,
6794 const gdb_byte *info_ptr,
6795 struct die_info *comp_unit_die,
6799 struct dwarf2_cu *cu = reader->cu;
6800 enum language *language_ptr = data;
6802 gdb_assert (cu->die_hash == NULL);
6804 htab_create_alloc_ex (cu->header.length / 12,
6808 &cu->comp_unit_obstack,
6809 hashtab_obstack_allocate,
6810 dummy_obstack_deallocate);
6813 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
6814 &info_ptr, comp_unit_die);
6815 cu->dies = comp_unit_die;
6816 /* comp_unit_die is not stored in die_hash, no need. */
6818 /* We try not to read any attributes in this function, because not
6819 all CUs needed for references have been loaded yet, and symbol
6820 table processing isn't initialized. But we have to set the CU language,
6821 or we won't be able to build types correctly.
6822 Similarly, if we do not read the producer, we can not apply
6823 producer-specific interpretation. */
6824 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
6827 /* Load the DIEs associated with PER_CU into memory. */
6830 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
6831 enum language pretend_language)
6833 gdb_assert (! this_cu->is_debug_types);
6835 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6836 load_full_comp_unit_reader, &pretend_language);
6839 /* Add a DIE to the delayed physname list. */
6842 add_to_method_list (struct type *type, int fnfield_index, int index,
6843 const char *name, struct die_info *die,
6844 struct dwarf2_cu *cu)
6846 struct delayed_method_info mi;
6848 mi.fnfield_index = fnfield_index;
6852 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
6855 /* A cleanup for freeing the delayed method list. */
6858 free_delayed_list (void *ptr)
6860 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
6861 if (cu->method_list != NULL)
6863 VEC_free (delayed_method_info, cu->method_list);
6864 cu->method_list = NULL;
6868 /* Compute the physnames of any methods on the CU's method list.
6870 The computation of method physnames is delayed in order to avoid the
6871 (bad) condition that one of the method's formal parameters is of an as yet
6875 compute_delayed_physnames (struct dwarf2_cu *cu)
6878 struct delayed_method_info *mi;
6879 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
6881 const char *physname;
6882 struct fn_fieldlist *fn_flp
6883 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
6884 physname = dwarf2_physname (mi->name, mi->die, cu);
6885 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
6889 /* Go objects should be embedded in a DW_TAG_module DIE,
6890 and it's not clear if/how imported objects will appear.
6891 To keep Go support simple until that's worked out,
6892 go back through what we've read and create something usable.
6893 We could do this while processing each DIE, and feels kinda cleaner,
6894 but that way is more invasive.
6895 This is to, for example, allow the user to type "p var" or "b main"
6896 without having to specify the package name, and allow lookups
6897 of module.object to work in contexts that use the expression
6901 fixup_go_packaging (struct dwarf2_cu *cu)
6903 char *package_name = NULL;
6904 struct pending *list;
6907 for (list = global_symbols; list != NULL; list = list->next)
6909 for (i = 0; i < list->nsyms; ++i)
6911 struct symbol *sym = list->symbol[i];
6913 if (SYMBOL_LANGUAGE (sym) == language_go
6914 && SYMBOL_CLASS (sym) == LOC_BLOCK)
6916 char *this_package_name = go_symbol_package_name (sym);
6918 if (this_package_name == NULL)
6920 if (package_name == NULL)
6921 package_name = this_package_name;
6924 if (strcmp (package_name, this_package_name) != 0)
6925 complaint (&symfile_complaints,
6926 _("Symtab %s has objects from two different Go packages: %s and %s"),
6927 (SYMBOL_SYMTAB (sym)
6928 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
6929 : cu->objfile->name),
6930 this_package_name, package_name);
6931 xfree (this_package_name);
6937 if (package_name != NULL)
6939 struct objfile *objfile = cu->objfile;
6940 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
6942 strlen (package_name));
6943 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
6944 saved_package_name, objfile);
6947 TYPE_TAG_NAME (type) = TYPE_NAME (type);
6949 sym = allocate_symbol (objfile);
6950 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
6951 SYMBOL_SET_NAMES (sym, saved_package_name,
6952 strlen (saved_package_name), 0, objfile);
6953 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
6954 e.g., "main" finds the "main" module and not C's main(). */
6955 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
6956 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
6957 SYMBOL_TYPE (sym) = type;
6959 add_symbol_to_list (sym, &global_symbols);
6961 xfree (package_name);
6965 /* Return the symtab for PER_CU. This works properly regardless of
6966 whether we're using the index or psymtabs. */
6968 static struct symtab *
6969 get_symtab (struct dwarf2_per_cu_data *per_cu)
6971 return (dwarf2_per_objfile->using_index
6972 ? per_cu->v.quick->symtab
6973 : per_cu->v.psymtab->symtab);
6976 /* A helper function for computing the list of all symbol tables
6977 included by PER_CU. */
6980 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
6981 htab_t all_children,
6982 struct dwarf2_per_cu_data *per_cu)
6986 struct dwarf2_per_cu_data *iter;
6988 slot = htab_find_slot (all_children, per_cu, INSERT);
6991 /* This inclusion and its children have been processed. */
6996 /* Only add a CU if it has a symbol table. */
6997 if (get_symtab (per_cu) != NULL)
6998 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
7001 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7003 recursively_compute_inclusions (result, all_children, iter);
7006 /* Compute the symtab 'includes' fields for the symtab related to
7010 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7012 gdb_assert (! per_cu->is_debug_types);
7014 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7017 struct dwarf2_per_cu_data *iter;
7018 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
7019 htab_t all_children;
7020 struct symtab *symtab = get_symtab (per_cu);
7022 /* If we don't have a symtab, we can just skip this case. */
7026 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7027 NULL, xcalloc, xfree);
7030 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7033 recursively_compute_inclusions (&result_children, all_children, iter);
7035 /* Now we have a transitive closure of all the included CUs, and
7036 for .gdb_index version 7 the included TUs, so we can convert it
7037 to a list of symtabs. */
7038 len = VEC_length (dwarf2_per_cu_ptr, result_children);
7040 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7041 (len + 1) * sizeof (struct symtab *));
7043 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
7045 symtab->includes[ix] = get_symtab (iter);
7046 symtab->includes[len] = NULL;
7048 VEC_free (dwarf2_per_cu_ptr, result_children);
7049 htab_delete (all_children);
7053 /* Compute the 'includes' field for the symtabs of all the CUs we just
7057 process_cu_includes (void)
7060 struct dwarf2_per_cu_data *iter;
7063 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7067 if (! iter->is_debug_types)
7068 compute_symtab_includes (iter);
7071 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7074 /* Generate full symbol information for PER_CU, whose DIEs have
7075 already been loaded into memory. */
7078 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7079 enum language pretend_language)
7081 struct dwarf2_cu *cu = per_cu->cu;
7082 struct objfile *objfile = per_cu->objfile;
7083 CORE_ADDR lowpc, highpc;
7084 struct symtab *symtab;
7085 struct cleanup *back_to, *delayed_list_cleanup;
7087 struct block *static_block;
7089 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7092 back_to = make_cleanup (really_free_pendings, NULL);
7093 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7095 cu->list_in_scope = &file_symbols;
7097 cu->language = pretend_language;
7098 cu->language_defn = language_def (cu->language);
7100 /* Do line number decoding in read_file_scope () */
7101 process_die (cu->dies, cu);
7103 /* For now fudge the Go package. */
7104 if (cu->language == language_go)
7105 fixup_go_packaging (cu);
7107 /* Now that we have processed all the DIEs in the CU, all the types
7108 should be complete, and it should now be safe to compute all of the
7110 compute_delayed_physnames (cu);
7111 do_cleanups (delayed_list_cleanup);
7113 /* Some compilers don't define a DW_AT_high_pc attribute for the
7114 compilation unit. If the DW_AT_high_pc is missing, synthesize
7115 it, by scanning the DIE's below the compilation unit. */
7116 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7119 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0,
7120 per_cu->imported_symtabs != NULL);
7122 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7123 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7124 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7125 addrmap to help ensure it has an accurate map of pc values belonging to
7127 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7129 symtab = end_symtab_from_static_block (static_block, objfile,
7130 SECT_OFF_TEXT (objfile), 0);
7134 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7136 /* Set symtab language to language from DW_AT_language. If the
7137 compilation is from a C file generated by language preprocessors, do
7138 not set the language if it was already deduced by start_subfile. */
7139 if (!(cu->language == language_c && symtab->language != language_c))
7140 symtab->language = cu->language;
7142 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7143 produce DW_AT_location with location lists but it can be possibly
7144 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7145 there were bugs in prologue debug info, fixed later in GCC-4.5
7146 by "unwind info for epilogues" patch (which is not directly related).
7148 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7149 needed, it would be wrong due to missing DW_AT_producer there.
7151 Still one can confuse GDB by using non-standard GCC compilation
7152 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7154 if (cu->has_loclist && gcc_4_minor >= 5)
7155 symtab->locations_valid = 1;
7157 if (gcc_4_minor >= 5)
7158 symtab->epilogue_unwind_valid = 1;
7160 symtab->call_site_htab = cu->call_site_htab;
7163 if (dwarf2_per_objfile->using_index)
7164 per_cu->v.quick->symtab = symtab;
7167 struct partial_symtab *pst = per_cu->v.psymtab;
7168 pst->symtab = symtab;
7172 /* Push it for inclusion processing later. */
7173 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7175 do_cleanups (back_to);
7178 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7179 already been loaded into memory. */
7182 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7183 enum language pretend_language)
7185 struct dwarf2_cu *cu = per_cu->cu;
7186 struct objfile *objfile = per_cu->objfile;
7187 struct symtab *symtab;
7188 struct cleanup *back_to, *delayed_list_cleanup;
7189 struct signatured_type *sig_type;
7191 gdb_assert (per_cu->is_debug_types);
7192 sig_type = (struct signatured_type *) per_cu;
7195 back_to = make_cleanup (really_free_pendings, NULL);
7196 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7198 cu->list_in_scope = &file_symbols;
7200 cu->language = pretend_language;
7201 cu->language_defn = language_def (cu->language);
7203 /* The symbol tables are set up in read_type_unit_scope. */
7204 process_die (cu->dies, cu);
7206 /* For now fudge the Go package. */
7207 if (cu->language == language_go)
7208 fixup_go_packaging (cu);
7210 /* Now that we have processed all the DIEs in the CU, all the types
7211 should be complete, and it should now be safe to compute all of the
7213 compute_delayed_physnames (cu);
7214 do_cleanups (delayed_list_cleanup);
7216 /* TUs share symbol tables.
7217 If this is the first TU to use this symtab, complete the construction
7218 of it with end_expandable_symtab. Otherwise, complete the addition of
7219 this TU's symbols to the existing symtab. */
7220 if (sig_type->type_unit_group->primary_symtab == NULL)
7222 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7223 sig_type->type_unit_group->primary_symtab = symtab;
7227 /* Set symtab language to language from DW_AT_language. If the
7228 compilation is from a C file generated by language preprocessors,
7229 do not set the language if it was already deduced by
7231 if (!(cu->language == language_c && symtab->language != language_c))
7232 symtab->language = cu->language;
7237 augment_type_symtab (objfile,
7238 sig_type->type_unit_group->primary_symtab);
7239 symtab = sig_type->type_unit_group->primary_symtab;
7242 if (dwarf2_per_objfile->using_index)
7243 per_cu->v.quick->symtab = symtab;
7246 struct partial_symtab *pst = per_cu->v.psymtab;
7247 pst->symtab = symtab;
7251 do_cleanups (back_to);
7254 /* Process an imported unit DIE. */
7257 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7259 struct attribute *attr;
7261 /* For now we don't handle imported units in type units. */
7262 if (cu->per_cu->is_debug_types)
7264 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7265 " supported in type units [in module %s]"),
7269 attr = dwarf2_attr (die, DW_AT_import, cu);
7272 struct dwarf2_per_cu_data *per_cu;
7273 struct symtab *imported_symtab;
7277 offset = dwarf2_get_ref_die_offset (attr);
7278 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7279 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7281 /* Queue the unit, if needed. */
7282 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7283 load_full_comp_unit (per_cu, cu->language);
7285 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7290 /* Process a die and its children. */
7293 process_die (struct die_info *die, struct dwarf2_cu *cu)
7297 case DW_TAG_padding:
7299 case DW_TAG_compile_unit:
7300 case DW_TAG_partial_unit:
7301 read_file_scope (die, cu);
7303 case DW_TAG_type_unit:
7304 read_type_unit_scope (die, cu);
7306 case DW_TAG_subprogram:
7307 case DW_TAG_inlined_subroutine:
7308 read_func_scope (die, cu);
7310 case DW_TAG_lexical_block:
7311 case DW_TAG_try_block:
7312 case DW_TAG_catch_block:
7313 read_lexical_block_scope (die, cu);
7315 case DW_TAG_GNU_call_site:
7316 read_call_site_scope (die, cu);
7318 case DW_TAG_class_type:
7319 case DW_TAG_interface_type:
7320 case DW_TAG_structure_type:
7321 case DW_TAG_union_type:
7322 process_structure_scope (die, cu);
7324 case DW_TAG_enumeration_type:
7325 process_enumeration_scope (die, cu);
7328 /* These dies have a type, but processing them does not create
7329 a symbol or recurse to process the children. Therefore we can
7330 read them on-demand through read_type_die. */
7331 case DW_TAG_subroutine_type:
7332 case DW_TAG_set_type:
7333 case DW_TAG_array_type:
7334 case DW_TAG_pointer_type:
7335 case DW_TAG_ptr_to_member_type:
7336 case DW_TAG_reference_type:
7337 case DW_TAG_string_type:
7340 case DW_TAG_base_type:
7341 case DW_TAG_subrange_type:
7342 case DW_TAG_typedef:
7343 /* Add a typedef symbol for the type definition, if it has a
7345 new_symbol (die, read_type_die (die, cu), cu);
7347 case DW_TAG_common_block:
7348 read_common_block (die, cu);
7350 case DW_TAG_common_inclusion:
7352 case DW_TAG_namespace:
7353 cu->processing_has_namespace_info = 1;
7354 read_namespace (die, cu);
7357 cu->processing_has_namespace_info = 1;
7358 read_module (die, cu);
7360 case DW_TAG_imported_declaration:
7361 case DW_TAG_imported_module:
7362 cu->processing_has_namespace_info = 1;
7363 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7364 || cu->language != language_fortran))
7365 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7366 dwarf_tag_name (die->tag));
7367 read_import_statement (die, cu);
7370 case DW_TAG_imported_unit:
7371 process_imported_unit_die (die, cu);
7375 new_symbol (die, NULL, cu);
7380 /* DWARF name computation. */
7382 /* A helper function for dwarf2_compute_name which determines whether DIE
7383 needs to have the name of the scope prepended to the name listed in the
7387 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7389 struct attribute *attr;
7393 case DW_TAG_namespace:
7394 case DW_TAG_typedef:
7395 case DW_TAG_class_type:
7396 case DW_TAG_interface_type:
7397 case DW_TAG_structure_type:
7398 case DW_TAG_union_type:
7399 case DW_TAG_enumeration_type:
7400 case DW_TAG_enumerator:
7401 case DW_TAG_subprogram:
7405 case DW_TAG_variable:
7406 case DW_TAG_constant:
7407 /* We only need to prefix "globally" visible variables. These include
7408 any variable marked with DW_AT_external or any variable that
7409 lives in a namespace. [Variables in anonymous namespaces
7410 require prefixing, but they are not DW_AT_external.] */
7412 if (dwarf2_attr (die, DW_AT_specification, cu))
7414 struct dwarf2_cu *spec_cu = cu;
7416 return die_needs_namespace (die_specification (die, &spec_cu),
7420 attr = dwarf2_attr (die, DW_AT_external, cu);
7421 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7422 && die->parent->tag != DW_TAG_module)
7424 /* A variable in a lexical block of some kind does not need a
7425 namespace, even though in C++ such variables may be external
7426 and have a mangled name. */
7427 if (die->parent->tag == DW_TAG_lexical_block
7428 || die->parent->tag == DW_TAG_try_block
7429 || die->parent->tag == DW_TAG_catch_block
7430 || die->parent->tag == DW_TAG_subprogram)
7439 /* Retrieve the last character from a mem_file. */
7442 do_ui_file_peek_last (void *object, const char *buffer, long length)
7444 char *last_char_p = (char *) object;
7447 *last_char_p = buffer[length - 1];
7450 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7451 compute the physname for the object, which include a method's:
7452 - formal parameters (C++/Java),
7453 - receiver type (Go),
7454 - return type (Java).
7456 The term "physname" is a bit confusing.
7457 For C++, for example, it is the demangled name.
7458 For Go, for example, it's the mangled name.
7460 For Ada, return the DIE's linkage name rather than the fully qualified
7461 name. PHYSNAME is ignored..
7463 The result is allocated on the objfile_obstack and canonicalized. */
7466 dwarf2_compute_name (const char *name,
7467 struct die_info *die, struct dwarf2_cu *cu,
7470 struct objfile *objfile = cu->objfile;
7473 name = dwarf2_name (die, cu);
7475 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7476 compute it by typename_concat inside GDB. */
7477 if (cu->language == language_ada
7478 || (cu->language == language_fortran && physname))
7480 /* For Ada unit, we prefer the linkage name over the name, as
7481 the former contains the exported name, which the user expects
7482 to be able to reference. Ideally, we want the user to be able
7483 to reference this entity using either natural or linkage name,
7484 but we haven't started looking at this enhancement yet. */
7485 struct attribute *attr;
7487 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7489 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7490 if (attr && DW_STRING (attr))
7491 return DW_STRING (attr);
7494 /* These are the only languages we know how to qualify names in. */
7496 && (cu->language == language_cplus || cu->language == language_java
7497 || cu->language == language_fortran))
7499 if (die_needs_namespace (die, cu))
7503 struct ui_file *buf;
7505 prefix = determine_prefix (die, cu);
7506 buf = mem_fileopen ();
7507 if (*prefix != '\0')
7509 char *prefixed_name = typename_concat (NULL, prefix, name,
7512 fputs_unfiltered (prefixed_name, buf);
7513 xfree (prefixed_name);
7516 fputs_unfiltered (name, buf);
7518 /* Template parameters may be specified in the DIE's DW_AT_name, or
7519 as children with DW_TAG_template_type_param or
7520 DW_TAG_value_type_param. If the latter, add them to the name
7521 here. If the name already has template parameters, then
7522 skip this step; some versions of GCC emit both, and
7523 it is more efficient to use the pre-computed name.
7525 Something to keep in mind about this process: it is very
7526 unlikely, or in some cases downright impossible, to produce
7527 something that will match the mangled name of a function.
7528 If the definition of the function has the same debug info,
7529 we should be able to match up with it anyway. But fallbacks
7530 using the minimal symbol, for instance to find a method
7531 implemented in a stripped copy of libstdc++, will not work.
7532 If we do not have debug info for the definition, we will have to
7533 match them up some other way.
7535 When we do name matching there is a related problem with function
7536 templates; two instantiated function templates are allowed to
7537 differ only by their return types, which we do not add here. */
7539 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7541 struct attribute *attr;
7542 struct die_info *child;
7545 die->building_fullname = 1;
7547 for (child = die->child; child != NULL; child = child->sibling)
7551 const gdb_byte *bytes;
7552 struct dwarf2_locexpr_baton *baton;
7555 if (child->tag != DW_TAG_template_type_param
7556 && child->tag != DW_TAG_template_value_param)
7561 fputs_unfiltered ("<", buf);
7565 fputs_unfiltered (", ", buf);
7567 attr = dwarf2_attr (child, DW_AT_type, cu);
7570 complaint (&symfile_complaints,
7571 _("template parameter missing DW_AT_type"));
7572 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7575 type = die_type (child, cu);
7577 if (child->tag == DW_TAG_template_type_param)
7579 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7583 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7586 complaint (&symfile_complaints,
7587 _("template parameter missing "
7588 "DW_AT_const_value"));
7589 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7593 dwarf2_const_value_attr (attr, type, name,
7594 &cu->comp_unit_obstack, cu,
7595 &value, &bytes, &baton);
7597 if (TYPE_NOSIGN (type))
7598 /* GDB prints characters as NUMBER 'CHAR'. If that's
7599 changed, this can use value_print instead. */
7600 c_printchar (value, type, buf);
7603 struct value_print_options opts;
7606 v = dwarf2_evaluate_loc_desc (type, NULL,
7610 else if (bytes != NULL)
7612 v = allocate_value (type);
7613 memcpy (value_contents_writeable (v), bytes,
7614 TYPE_LENGTH (type));
7617 v = value_from_longest (type, value);
7619 /* Specify decimal so that we do not depend on
7621 get_formatted_print_options (&opts, 'd');
7623 value_print (v, buf, &opts);
7629 die->building_fullname = 0;
7633 /* Close the argument list, with a space if necessary
7634 (nested templates). */
7635 char last_char = '\0';
7636 ui_file_put (buf, do_ui_file_peek_last, &last_char);
7637 if (last_char == '>')
7638 fputs_unfiltered (" >", buf);
7640 fputs_unfiltered (">", buf);
7644 /* For Java and C++ methods, append formal parameter type
7645 information, if PHYSNAME. */
7647 if (physname && die->tag == DW_TAG_subprogram
7648 && (cu->language == language_cplus
7649 || cu->language == language_java))
7651 struct type *type = read_type_die (die, cu);
7653 c_type_print_args (type, buf, 1, cu->language,
7654 &type_print_raw_options);
7656 if (cu->language == language_java)
7658 /* For java, we must append the return type to method
7660 if (die->tag == DW_TAG_subprogram)
7661 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
7662 0, 0, &type_print_raw_options);
7664 else if (cu->language == language_cplus)
7666 /* Assume that an artificial first parameter is
7667 "this", but do not crash if it is not. RealView
7668 marks unnamed (and thus unused) parameters as
7669 artificial; there is no way to differentiate
7671 if (TYPE_NFIELDS (type) > 0
7672 && TYPE_FIELD_ARTIFICIAL (type, 0)
7673 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
7674 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
7676 fputs_unfiltered (" const", buf);
7680 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
7682 ui_file_delete (buf);
7684 if (cu->language == language_cplus)
7687 = dwarf2_canonicalize_name (name, cu,
7688 &objfile->objfile_obstack);
7699 /* Return the fully qualified name of DIE, based on its DW_AT_name.
7700 If scope qualifiers are appropriate they will be added. The result
7701 will be allocated on the objfile_obstack, or NULL if the DIE does
7702 not have a name. NAME may either be from a previous call to
7703 dwarf2_name or NULL.
7705 The output string will be canonicalized (if C++/Java). */
7708 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7710 return dwarf2_compute_name (name, die, cu, 0);
7713 /* Construct a physname for the given DIE in CU. NAME may either be
7714 from a previous call to dwarf2_name or NULL. The result will be
7715 allocated on the objfile_objstack or NULL if the DIE does not have a
7718 The output string will be canonicalized (if C++/Java). */
7721 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7723 struct objfile *objfile = cu->objfile;
7724 struct attribute *attr;
7725 const char *retval, *mangled = NULL, *canon = NULL;
7726 struct cleanup *back_to;
7729 /* In this case dwarf2_compute_name is just a shortcut not building anything
7731 if (!die_needs_namespace (die, cu))
7732 return dwarf2_compute_name (name, die, cu, 1);
7734 back_to = make_cleanup (null_cleanup, NULL);
7736 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7738 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7740 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
7742 if (attr && DW_STRING (attr))
7746 mangled = DW_STRING (attr);
7748 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
7749 type. It is easier for GDB users to search for such functions as
7750 `name(params)' than `long name(params)'. In such case the minimal
7751 symbol names do not match the full symbol names but for template
7752 functions there is never a need to look up their definition from their
7753 declaration so the only disadvantage remains the minimal symbol
7754 variant `long name(params)' does not have the proper inferior type.
7757 if (cu->language == language_go)
7759 /* This is a lie, but we already lie to the caller new_symbol_full.
7760 new_symbol_full assumes we return the mangled name.
7761 This just undoes that lie until things are cleaned up. */
7766 demangled = gdb_demangle (mangled,
7767 (DMGL_PARAMS | DMGL_ANSI
7768 | (cu->language == language_java
7769 ? DMGL_JAVA | DMGL_RET_POSTFIX
7774 make_cleanup (xfree, demangled);
7784 if (canon == NULL || check_physname)
7786 const char *physname = dwarf2_compute_name (name, die, cu, 1);
7788 if (canon != NULL && strcmp (physname, canon) != 0)
7790 /* It may not mean a bug in GDB. The compiler could also
7791 compute DW_AT_linkage_name incorrectly. But in such case
7792 GDB would need to be bug-to-bug compatible. */
7794 complaint (&symfile_complaints,
7795 _("Computed physname <%s> does not match demangled <%s> "
7796 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
7797 physname, canon, mangled, die->offset.sect_off, objfile->name);
7799 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
7800 is available here - over computed PHYSNAME. It is safer
7801 against both buggy GDB and buggy compilers. */
7815 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
7817 do_cleanups (back_to);
7821 /* Read the import statement specified by the given die and record it. */
7824 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
7826 struct objfile *objfile = cu->objfile;
7827 struct attribute *import_attr;
7828 struct die_info *imported_die, *child_die;
7829 struct dwarf2_cu *imported_cu;
7830 const char *imported_name;
7831 const char *imported_name_prefix;
7832 const char *canonical_name;
7833 const char *import_alias;
7834 const char *imported_declaration = NULL;
7835 const char *import_prefix;
7836 VEC (const_char_ptr) *excludes = NULL;
7837 struct cleanup *cleanups;
7839 import_attr = dwarf2_attr (die, DW_AT_import, cu);
7840 if (import_attr == NULL)
7842 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7843 dwarf_tag_name (die->tag));
7848 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
7849 imported_name = dwarf2_name (imported_die, imported_cu);
7850 if (imported_name == NULL)
7852 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
7854 The import in the following code:
7868 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
7869 <52> DW_AT_decl_file : 1
7870 <53> DW_AT_decl_line : 6
7871 <54> DW_AT_import : <0x75>
7872 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
7874 <5b> DW_AT_decl_file : 1
7875 <5c> DW_AT_decl_line : 2
7876 <5d> DW_AT_type : <0x6e>
7878 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
7879 <76> DW_AT_byte_size : 4
7880 <77> DW_AT_encoding : 5 (signed)
7882 imports the wrong die ( 0x75 instead of 0x58 ).
7883 This case will be ignored until the gcc bug is fixed. */
7887 /* Figure out the local name after import. */
7888 import_alias = dwarf2_name (die, cu);
7890 /* Figure out where the statement is being imported to. */
7891 import_prefix = determine_prefix (die, cu);
7893 /* Figure out what the scope of the imported die is and prepend it
7894 to the name of the imported die. */
7895 imported_name_prefix = determine_prefix (imported_die, imported_cu);
7897 if (imported_die->tag != DW_TAG_namespace
7898 && imported_die->tag != DW_TAG_module)
7900 imported_declaration = imported_name;
7901 canonical_name = imported_name_prefix;
7903 else if (strlen (imported_name_prefix) > 0)
7904 canonical_name = obconcat (&objfile->objfile_obstack,
7905 imported_name_prefix, "::", imported_name,
7908 canonical_name = imported_name;
7910 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
7912 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
7913 for (child_die = die->child; child_die && child_die->tag;
7914 child_die = sibling_die (child_die))
7916 /* DWARF-4: A Fortran use statement with a “rename list” may be
7917 represented by an imported module entry with an import attribute
7918 referring to the module and owned entries corresponding to those
7919 entities that are renamed as part of being imported. */
7921 if (child_die->tag != DW_TAG_imported_declaration)
7923 complaint (&symfile_complaints,
7924 _("child DW_TAG_imported_declaration expected "
7925 "- DIE at 0x%x [in module %s]"),
7926 child_die->offset.sect_off, objfile->name);
7930 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
7931 if (import_attr == NULL)
7933 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7934 dwarf_tag_name (child_die->tag));
7939 imported_die = follow_die_ref_or_sig (child_die, import_attr,
7941 imported_name = dwarf2_name (imported_die, imported_cu);
7942 if (imported_name == NULL)
7944 complaint (&symfile_complaints,
7945 _("child DW_TAG_imported_declaration has unknown "
7946 "imported name - DIE at 0x%x [in module %s]"),
7947 child_die->offset.sect_off, objfile->name);
7951 VEC_safe_push (const_char_ptr, excludes, imported_name);
7953 process_die (child_die, cu);
7956 cp_add_using_directive (import_prefix,
7959 imported_declaration,
7962 &objfile->objfile_obstack);
7964 do_cleanups (cleanups);
7967 /* Cleanup function for handle_DW_AT_stmt_list. */
7970 free_cu_line_header (void *arg)
7972 struct dwarf2_cu *cu = arg;
7974 free_line_header (cu->line_header);
7975 cu->line_header = NULL;
7978 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
7979 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
7980 this, it was first present in GCC release 4.3.0. */
7983 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
7985 if (!cu->checked_producer)
7986 check_producer (cu);
7988 return cu->producer_is_gcc_lt_4_3;
7992 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
7993 const char **name, const char **comp_dir)
7995 struct attribute *attr;
8000 /* Find the filename. Do not use dwarf2_name here, since the filename
8001 is not a source language identifier. */
8002 attr = dwarf2_attr (die, DW_AT_name, cu);
8005 *name = DW_STRING (attr);
8008 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8010 *comp_dir = DW_STRING (attr);
8011 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8012 && IS_ABSOLUTE_PATH (*name))
8014 char *d = ldirname (*name);
8018 make_cleanup (xfree, d);
8020 if (*comp_dir != NULL)
8022 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8023 directory, get rid of it. */
8024 char *cp = strchr (*comp_dir, ':');
8026 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8031 *name = "<unknown>";
8034 /* Handle DW_AT_stmt_list for a compilation unit.
8035 DIE is the DW_TAG_compile_unit die for CU.
8036 COMP_DIR is the compilation directory.
8037 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8040 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8041 const char *comp_dir)
8043 struct attribute *attr;
8045 gdb_assert (! cu->per_cu->is_debug_types);
8047 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8050 unsigned int line_offset = DW_UNSND (attr);
8051 struct line_header *line_header
8052 = dwarf_decode_line_header (line_offset, cu);
8056 cu->line_header = line_header;
8057 make_cleanup (free_cu_line_header, cu);
8058 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8063 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8066 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8068 struct objfile *objfile = dwarf2_per_objfile->objfile;
8069 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8070 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8071 CORE_ADDR highpc = ((CORE_ADDR) 0);
8072 struct attribute *attr;
8073 const char *name = NULL;
8074 const char *comp_dir = NULL;
8075 struct die_info *child_die;
8076 bfd *abfd = objfile->obfd;
8079 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8081 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8083 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8084 from finish_block. */
8085 if (lowpc == ((CORE_ADDR) -1))
8090 find_file_and_directory (die, cu, &name, &comp_dir);
8092 prepare_one_comp_unit (cu, die, cu->language);
8094 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8095 standardised yet. As a workaround for the language detection we fall
8096 back to the DW_AT_producer string. */
8097 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8098 cu->language = language_opencl;
8100 /* Similar hack for Go. */
8101 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8102 set_cu_language (DW_LANG_Go, cu);
8104 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8106 /* Decode line number information if present. We do this before
8107 processing child DIEs, so that the line header table is available
8108 for DW_AT_decl_file. */
8109 handle_DW_AT_stmt_list (die, cu, comp_dir);
8111 /* Process all dies in compilation unit. */
8112 if (die->child != NULL)
8114 child_die = die->child;
8115 while (child_die && child_die->tag)
8117 process_die (child_die, cu);
8118 child_die = sibling_die (child_die);
8122 /* Decode macro information, if present. Dwarf 2 macro information
8123 refers to information in the line number info statement program
8124 header, so we can only read it if we've read the header
8126 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8127 if (attr && cu->line_header)
8129 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8130 complaint (&symfile_complaints,
8131 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8133 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8137 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8138 if (attr && cu->line_header)
8140 unsigned int macro_offset = DW_UNSND (attr);
8142 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8146 do_cleanups (back_to);
8149 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8150 Create the set of symtabs used by this TU, or if this TU is sharing
8151 symtabs with another TU and the symtabs have already been created
8152 then restore those symtabs in the line header.
8153 We don't need the pc/line-number mapping for type units. */
8156 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8158 struct objfile *objfile = dwarf2_per_objfile->objfile;
8159 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8160 struct type_unit_group *tu_group;
8162 struct line_header *lh;
8163 struct attribute *attr;
8164 unsigned int i, line_offset;
8165 struct signatured_type *sig_type;
8167 gdb_assert (per_cu->is_debug_types);
8168 sig_type = (struct signatured_type *) per_cu;
8170 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8172 /* If we're using .gdb_index (includes -readnow) then
8173 per_cu->s.type_unit_group may not have been set up yet. */
8174 if (sig_type->type_unit_group == NULL)
8175 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8176 tu_group = sig_type->type_unit_group;
8178 /* If we've already processed this stmt_list there's no real need to
8179 do it again, we could fake it and just recreate the part we need
8180 (file name,index -> symtab mapping). If data shows this optimization
8181 is useful we can do it then. */
8182 first_time = tu_group->primary_symtab == NULL;
8184 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8189 line_offset = DW_UNSND (attr);
8190 lh = dwarf_decode_line_header (line_offset, cu);
8195 dwarf2_start_symtab (cu, "", NULL, 0);
8198 gdb_assert (tu_group->symtabs == NULL);
8201 /* Note: The primary symtab will get allocated at the end. */
8205 cu->line_header = lh;
8206 make_cleanup (free_cu_line_header, cu);
8210 dwarf2_start_symtab (cu, "", NULL, 0);
8212 tu_group->num_symtabs = lh->num_file_names;
8213 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8215 for (i = 0; i < lh->num_file_names; ++i)
8217 const char *dir = NULL;
8218 struct file_entry *fe = &lh->file_names[i];
8221 dir = lh->include_dirs[fe->dir_index - 1];
8222 dwarf2_start_subfile (fe->name, dir, NULL);
8224 /* Note: We don't have to watch for the main subfile here, type units
8225 don't have DW_AT_name. */
8227 if (current_subfile->symtab == NULL)
8229 /* NOTE: start_subfile will recognize when it's been passed
8230 a file it has already seen. So we can't assume there's a
8231 simple mapping from lh->file_names to subfiles,
8232 lh->file_names may contain dups. */
8233 current_subfile->symtab = allocate_symtab (current_subfile->name,
8237 fe->symtab = current_subfile->symtab;
8238 tu_group->symtabs[i] = fe->symtab;
8245 for (i = 0; i < lh->num_file_names; ++i)
8247 struct file_entry *fe = &lh->file_names[i];
8249 fe->symtab = tu_group->symtabs[i];
8253 /* The main symtab is allocated last. Type units don't have DW_AT_name
8254 so they don't have a "real" (so to speak) symtab anyway.
8255 There is later code that will assign the main symtab to all symbols
8256 that don't have one. We need to handle the case of a symbol with a
8257 missing symtab (DW_AT_decl_file) anyway. */
8260 /* Process DW_TAG_type_unit.
8261 For TUs we want to skip the first top level sibling if it's not the
8262 actual type being defined by this TU. In this case the first top
8263 level sibling is there to provide context only. */
8266 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8268 struct die_info *child_die;
8270 prepare_one_comp_unit (cu, die, language_minimal);
8272 /* Initialize (or reinitialize) the machinery for building symtabs.
8273 We do this before processing child DIEs, so that the line header table
8274 is available for DW_AT_decl_file. */
8275 setup_type_unit_groups (die, cu);
8277 if (die->child != NULL)
8279 child_die = die->child;
8280 while (child_die && child_die->tag)
8282 process_die (child_die, cu);
8283 child_die = sibling_die (child_die);
8290 http://gcc.gnu.org/wiki/DebugFission
8291 http://gcc.gnu.org/wiki/DebugFissionDWP
8293 To simplify handling of both DWO files ("object" files with the DWARF info)
8294 and DWP files (a file with the DWOs packaged up into one file), we treat
8295 DWP files as having a collection of virtual DWO files. */
8298 hash_dwo_file (const void *item)
8300 const struct dwo_file *dwo_file = item;
8302 return (htab_hash_string (dwo_file->dwo_name)
8303 + htab_hash_string (dwo_file->comp_dir));
8307 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8309 const struct dwo_file *lhs = item_lhs;
8310 const struct dwo_file *rhs = item_rhs;
8312 return (strcmp (lhs->dwo_name, rhs->dwo_name) == 0
8313 && strcmp (lhs->comp_dir, rhs->comp_dir) == 0);
8316 /* Allocate a hash table for DWO files. */
8319 allocate_dwo_file_hash_table (void)
8321 struct objfile *objfile = dwarf2_per_objfile->objfile;
8323 return htab_create_alloc_ex (41,
8327 &objfile->objfile_obstack,
8328 hashtab_obstack_allocate,
8329 dummy_obstack_deallocate);
8332 /* Lookup DWO file DWO_NAME. */
8335 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8337 struct dwo_file find_entry;
8340 if (dwarf2_per_objfile->dwo_files == NULL)
8341 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8343 memset (&find_entry, 0, sizeof (find_entry));
8344 find_entry.dwo_name = dwo_name;
8345 find_entry.comp_dir = comp_dir;
8346 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8352 hash_dwo_unit (const void *item)
8354 const struct dwo_unit *dwo_unit = item;
8356 /* This drops the top 32 bits of the id, but is ok for a hash. */
8357 return dwo_unit->signature;
8361 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8363 const struct dwo_unit *lhs = item_lhs;
8364 const struct dwo_unit *rhs = item_rhs;
8366 /* The signature is assumed to be unique within the DWO file.
8367 So while object file CU dwo_id's always have the value zero,
8368 that's OK, assuming each object file DWO file has only one CU,
8369 and that's the rule for now. */
8370 return lhs->signature == rhs->signature;
8373 /* Allocate a hash table for DWO CUs,TUs.
8374 There is one of these tables for each of CUs,TUs for each DWO file. */
8377 allocate_dwo_unit_table (struct objfile *objfile)
8379 /* Start out with a pretty small number.
8380 Generally DWO files contain only one CU and maybe some TUs. */
8381 return htab_create_alloc_ex (3,
8385 &objfile->objfile_obstack,
8386 hashtab_obstack_allocate,
8387 dummy_obstack_deallocate);
8390 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8392 struct create_dwo_info_table_data
8394 struct dwo_file *dwo_file;
8398 /* die_reader_func for create_dwo_debug_info_hash_table. */
8401 create_dwo_debug_info_hash_table_reader (const struct die_reader_specs *reader,
8402 const gdb_byte *info_ptr,
8403 struct die_info *comp_unit_die,
8407 struct dwarf2_cu *cu = reader->cu;
8408 struct objfile *objfile = dwarf2_per_objfile->objfile;
8409 sect_offset offset = cu->per_cu->offset;
8410 struct dwarf2_section_info *section = cu->per_cu->section;
8411 struct create_dwo_info_table_data *data = datap;
8412 struct dwo_file *dwo_file = data->dwo_file;
8413 htab_t cu_htab = data->cu_htab;
8415 struct attribute *attr;
8416 struct dwo_unit *dwo_unit;
8418 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8421 error (_("Dwarf Error: debug entry at offset 0x%x is missing"
8422 " its dwo_id [in module %s]"),
8423 offset.sect_off, dwo_file->dwo_name);
8427 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8428 dwo_unit->dwo_file = dwo_file;
8429 dwo_unit->signature = DW_UNSND (attr);
8430 dwo_unit->section = section;
8431 dwo_unit->offset = offset;
8432 dwo_unit->length = cu->per_cu->length;
8434 slot = htab_find_slot (cu_htab, dwo_unit, INSERT);
8435 gdb_assert (slot != NULL);
8438 const struct dwo_unit *dup_dwo_unit = *slot;
8440 complaint (&symfile_complaints,
8441 _("debug entry at offset 0x%x is duplicate to the entry at"
8442 " offset 0x%x, dwo_id 0x%s [in module %s]"),
8443 offset.sect_off, dup_dwo_unit->offset.sect_off,
8444 phex (dwo_unit->signature, sizeof (dwo_unit->signature)),
8445 dwo_file->dwo_name);
8450 if (dwarf2_read_debug)
8451 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id 0x%s\n",
8453 phex (dwo_unit->signature,
8454 sizeof (dwo_unit->signature)));
8457 /* Create a hash table to map DWO IDs to their CU entry in
8458 .debug_info.dwo in DWO_FILE.
8459 Note: This function processes DWO files only, not DWP files.
8460 Note: A DWO file generally contains one CU, but we don't assume this. */
8463 create_dwo_debug_info_hash_table (struct dwo_file *dwo_file)
8465 struct objfile *objfile = dwarf2_per_objfile->objfile;
8466 struct dwarf2_section_info *section = &dwo_file->sections.info;
8469 const gdb_byte *info_ptr, *end_ptr;
8470 struct create_dwo_info_table_data create_dwo_info_table_data;
8472 dwarf2_read_section (objfile, section);
8473 info_ptr = section->buffer;
8475 if (info_ptr == NULL)
8478 /* We can't set abfd until now because the section may be empty or
8479 not present, in which case section->asection will be NULL. */
8480 abfd = section->asection->owner;
8482 if (dwarf2_read_debug)
8483 fprintf_unfiltered (gdb_stdlog, "Reading .debug_info.dwo for %s:\n",
8484 bfd_get_filename (abfd));
8486 cu_htab = allocate_dwo_unit_table (objfile);
8488 create_dwo_info_table_data.dwo_file = dwo_file;
8489 create_dwo_info_table_data.cu_htab = cu_htab;
8491 end_ptr = info_ptr + section->size;
8492 while (info_ptr < end_ptr)
8494 struct dwarf2_per_cu_data per_cu;
8496 memset (&per_cu, 0, sizeof (per_cu));
8497 per_cu.objfile = objfile;
8498 per_cu.is_debug_types = 0;
8499 per_cu.offset.sect_off = info_ptr - section->buffer;
8500 per_cu.section = section;
8502 init_cutu_and_read_dies_no_follow (&per_cu,
8503 &dwo_file->sections.abbrev,
8505 create_dwo_debug_info_hash_table_reader,
8506 &create_dwo_info_table_data);
8508 info_ptr += per_cu.length;
8514 /* DWP file .debug_{cu,tu}_index section format:
8515 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8517 Both index sections have the same format, and serve to map a 64-bit
8518 signature to a set of section numbers. Each section begins with a header,
8519 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8520 indexes, and a pool of 32-bit section numbers. The index sections will be
8521 aligned at 8-byte boundaries in the file.
8523 The index section header contains two unsigned 32-bit values (using the
8524 byte order of the application binary):
8526 N, the number of compilation units or type units in the index
8527 M, the number of slots in the hash table
8529 (We assume that N and M will not exceed 2^32 - 1.)
8531 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8533 The hash table begins at offset 8 in the section, and consists of an array
8534 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8535 order of the application binary). Unused slots in the hash table are 0.
8536 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8538 The parallel table begins immediately after the hash table
8539 (at offset 8 + 8 * M from the beginning of the section), and consists of an
8540 array of 32-bit indexes (using the byte order of the application binary),
8541 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8542 table contains a 32-bit index into the pool of section numbers. For unused
8543 hash table slots, the corresponding entry in the parallel table will be 0.
8545 Given a 64-bit compilation unit signature or a type signature S, an entry
8546 in the hash table is located as follows:
8548 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8549 the low-order k bits all set to 1.
8551 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8553 3) If the hash table entry at index H matches the signature, use that
8554 entry. If the hash table entry at index H is unused (all zeroes),
8555 terminate the search: the signature is not present in the table.
8557 4) Let H = (H + H') modulo M. Repeat at Step 3.
8559 Because M > N and H' and M are relatively prime, the search is guaranteed
8560 to stop at an unused slot or find the match.
8562 The pool of section numbers begins immediately following the hash table
8563 (at offset 8 + 12 * M from the beginning of the section). The pool of
8564 section numbers consists of an array of 32-bit words (using the byte order
8565 of the application binary). Each item in the array is indexed starting
8566 from 0. The hash table entry provides the index of the first section
8567 number in the set. Additional section numbers in the set follow, and the
8568 set is terminated by a 0 entry (section number 0 is not used in ELF).
8570 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8571 section must be the first entry in the set, and the .debug_abbrev.dwo must
8572 be the second entry. Other members of the set may follow in any order. */
8574 /* Create a hash table to map DWO IDs to their CU/TU entry in
8575 .debug_{info,types}.dwo in DWP_FILE.
8576 Returns NULL if there isn't one.
8577 Note: This function processes DWP files only, not DWO files. */
8579 static struct dwp_hash_table *
8580 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8582 struct objfile *objfile = dwarf2_per_objfile->objfile;
8583 bfd *dbfd = dwp_file->dbfd;
8584 const char *index_ptr, *index_end;
8585 struct dwarf2_section_info *index;
8586 uint32_t version, nr_units, nr_slots;
8587 struct dwp_hash_table *htab;
8590 index = &dwp_file->sections.tu_index;
8592 index = &dwp_file->sections.cu_index;
8594 if (dwarf2_section_empty_p (index))
8596 dwarf2_read_section (objfile, index);
8598 index_ptr = index->buffer;
8599 index_end = index_ptr + index->size;
8601 version = read_4_bytes (dbfd, index_ptr);
8602 index_ptr += 8; /* Skip the unused word. */
8603 nr_units = read_4_bytes (dbfd, index_ptr);
8605 nr_slots = read_4_bytes (dbfd, index_ptr);
8610 error (_("Dwarf Error: unsupported DWP file version (%u)"
8612 version, dwp_file->name);
8614 if (nr_slots != (nr_slots & -nr_slots))
8616 error (_("Dwarf Error: number of slots in DWP hash table (%u)"
8617 " is not power of 2 [in module %s]"),
8618 nr_slots, dwp_file->name);
8621 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
8622 htab->nr_units = nr_units;
8623 htab->nr_slots = nr_slots;
8624 htab->hash_table = index_ptr;
8625 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
8626 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
8631 /* Update SECTIONS with the data from SECTP.
8633 This function is like the other "locate" section routines that are
8634 passed to bfd_map_over_sections, but in this context the sections to
8635 read comes from the DWP hash table, not the full ELF section table.
8637 The result is non-zero for success, or zero if an error was found. */
8640 locate_virtual_dwo_sections (asection *sectp,
8641 struct virtual_dwo_sections *sections)
8643 const struct dwop_section_names *names = &dwop_section_names;
8645 if (section_is_p (sectp->name, &names->abbrev_dwo))
8647 /* There can be only one. */
8648 if (sections->abbrev.asection != NULL)
8650 sections->abbrev.asection = sectp;
8651 sections->abbrev.size = bfd_get_section_size (sectp);
8653 else if (section_is_p (sectp->name, &names->info_dwo)
8654 || section_is_p (sectp->name, &names->types_dwo))
8656 /* There can be only one. */
8657 if (sections->info_or_types.asection != NULL)
8659 sections->info_or_types.asection = sectp;
8660 sections->info_or_types.size = bfd_get_section_size (sectp);
8662 else if (section_is_p (sectp->name, &names->line_dwo))
8664 /* There can be only one. */
8665 if (sections->line.asection != NULL)
8667 sections->line.asection = sectp;
8668 sections->line.size = bfd_get_section_size (sectp);
8670 else if (section_is_p (sectp->name, &names->loc_dwo))
8672 /* There can be only one. */
8673 if (sections->loc.asection != NULL)
8675 sections->loc.asection = sectp;
8676 sections->loc.size = bfd_get_section_size (sectp);
8678 else if (section_is_p (sectp->name, &names->macinfo_dwo))
8680 /* There can be only one. */
8681 if (sections->macinfo.asection != NULL)
8683 sections->macinfo.asection = sectp;
8684 sections->macinfo.size = bfd_get_section_size (sectp);
8686 else if (section_is_p (sectp->name, &names->macro_dwo))
8688 /* There can be only one. */
8689 if (sections->macro.asection != NULL)
8691 sections->macro.asection = sectp;
8692 sections->macro.size = bfd_get_section_size (sectp);
8694 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
8696 /* There can be only one. */
8697 if (sections->str_offsets.asection != NULL)
8699 sections->str_offsets.asection = sectp;
8700 sections->str_offsets.size = bfd_get_section_size (sectp);
8704 /* No other kind of section is valid. */
8711 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
8712 HTAB is the hash table from the DWP file.
8713 SECTION_INDEX is the index of the DWO in HTAB.
8714 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
8716 static struct dwo_unit *
8717 create_dwo_in_dwp (struct dwp_file *dwp_file,
8718 const struct dwp_hash_table *htab,
8719 uint32_t section_index,
8720 const char *comp_dir,
8721 ULONGEST signature, int is_debug_types)
8723 struct objfile *objfile = dwarf2_per_objfile->objfile;
8724 bfd *dbfd = dwp_file->dbfd;
8725 const char *kind = is_debug_types ? "TU" : "CU";
8726 struct dwo_file *dwo_file;
8727 struct dwo_unit *dwo_unit;
8728 struct virtual_dwo_sections sections;
8729 void **dwo_file_slot;
8730 char *virtual_dwo_name;
8731 struct dwarf2_section_info *cutu;
8732 struct cleanup *cleanups;
8735 if (dwarf2_read_debug)
8737 fprintf_unfiltered (gdb_stdlog, "Reading %s %u/0x%s in DWP file: %s\n",
8739 section_index, phex (signature, sizeof (signature)),
8743 /* Fetch the sections of this DWO.
8744 Put a limit on the number of sections we look for so that bad data
8745 doesn't cause us to loop forever. */
8747 #define MAX_NR_DWO_SECTIONS \
8748 (1 /* .debug_info or .debug_types */ \
8749 + 1 /* .debug_abbrev */ \
8750 + 1 /* .debug_line */ \
8751 + 1 /* .debug_loc */ \
8752 + 1 /* .debug_str_offsets */ \
8753 + 1 /* .debug_macro */ \
8754 + 1 /* .debug_macinfo */ \
8755 + 1 /* trailing zero */)
8757 memset (§ions, 0, sizeof (sections));
8758 cleanups = make_cleanup (null_cleanup, 0);
8760 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
8763 uint32_t section_nr =
8766 + (section_index + i) * sizeof (uint32_t));
8768 if (section_nr == 0)
8770 if (section_nr >= dwp_file->num_sections)
8772 error (_("Dwarf Error: bad DWP hash table, section number too large"
8777 sectp = dwp_file->elf_sections[section_nr];
8778 if (! locate_virtual_dwo_sections (sectp, §ions))
8780 error (_("Dwarf Error: bad DWP hash table, invalid section found"
8787 || sections.info_or_types.asection == NULL
8788 || sections.abbrev.asection == NULL)
8790 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
8794 if (i == MAX_NR_DWO_SECTIONS)
8796 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
8801 /* It's easier for the rest of the code if we fake a struct dwo_file and
8802 have dwo_unit "live" in that. At least for now.
8804 The DWP file can be made up of a random collection of CUs and TUs.
8805 However, for each CU + set of TUs that came from the same original DWO
8806 file, we want to combine them back into a virtual DWO file to save space
8807 (fewer struct dwo_file objects to allocated). Remember that for really
8808 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
8811 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
8812 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
8813 sections.line.asection ? sections.line.asection->id : 0,
8814 sections.loc.asection ? sections.loc.asection->id : 0,
8815 (sections.str_offsets.asection
8816 ? sections.str_offsets.asection->id
8818 make_cleanup (xfree, virtual_dwo_name);
8819 /* Can we use an existing virtual DWO file? */
8820 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
8821 /* Create one if necessary. */
8822 if (*dwo_file_slot == NULL)
8824 if (dwarf2_read_debug)
8826 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
8829 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
8830 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
8832 strlen (virtual_dwo_name));
8833 dwo_file->comp_dir = comp_dir;
8834 dwo_file->sections.abbrev = sections.abbrev;
8835 dwo_file->sections.line = sections.line;
8836 dwo_file->sections.loc = sections.loc;
8837 dwo_file->sections.macinfo = sections.macinfo;
8838 dwo_file->sections.macro = sections.macro;
8839 dwo_file->sections.str_offsets = sections.str_offsets;
8840 /* The "str" section is global to the entire DWP file. */
8841 dwo_file->sections.str = dwp_file->sections.str;
8842 /* The info or types section is assigned later to dwo_unit,
8843 there's no need to record it in dwo_file.
8844 Also, we can't simply record type sections in dwo_file because
8845 we record a pointer into the vector in dwo_unit. As we collect more
8846 types we'll grow the vector and eventually have to reallocate space
8847 for it, invalidating all the pointers into the current copy. */
8848 *dwo_file_slot = dwo_file;
8852 if (dwarf2_read_debug)
8854 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
8857 dwo_file = *dwo_file_slot;
8859 do_cleanups (cleanups);
8861 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8862 dwo_unit->dwo_file = dwo_file;
8863 dwo_unit->signature = signature;
8864 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
8865 sizeof (struct dwarf2_section_info));
8866 *dwo_unit->section = sections.info_or_types;
8867 /* offset, length, type_offset_in_tu are set later. */
8872 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
8874 static struct dwo_unit *
8875 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
8876 const struct dwp_hash_table *htab,
8877 const char *comp_dir,
8878 ULONGEST signature, int is_debug_types)
8880 bfd *dbfd = dwp_file->dbfd;
8881 uint32_t mask = htab->nr_slots - 1;
8882 uint32_t hash = signature & mask;
8883 uint32_t hash2 = ((signature >> 32) & mask) | 1;
8886 struct dwo_unit find_dwo_cu, *dwo_cu;
8888 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
8889 find_dwo_cu.signature = signature;
8890 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
8895 /* Use a for loop so that we don't loop forever on bad debug info. */
8896 for (i = 0; i < htab->nr_slots; ++i)
8898 ULONGEST signature_in_table;
8900 signature_in_table =
8901 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
8902 if (signature_in_table == signature)
8904 uint32_t section_index =
8905 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
8907 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
8908 comp_dir, signature, is_debug_types);
8911 if (signature_in_table == 0)
8913 hash = (hash + hash2) & mask;
8916 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
8921 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
8922 Open the file specified by FILE_NAME and hand it off to BFD for
8923 preliminary analysis. Return a newly initialized bfd *, which
8924 includes a canonicalized copy of FILE_NAME.
8925 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
8926 In case of trouble, return NULL.
8927 NOTE: This function is derived from symfile_bfd_open. */
8930 try_open_dwop_file (const char *file_name, int is_dwp)
8934 char *absolute_name;
8936 flags = OPF_TRY_CWD_FIRST;
8938 flags |= OPF_SEARCH_IN_PATH;
8939 desc = openp (debug_file_directory, flags, file_name,
8940 O_RDONLY | O_BINARY, &absolute_name);
8944 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
8947 xfree (absolute_name);
8950 xfree (absolute_name);
8951 bfd_set_cacheable (sym_bfd, 1);
8953 if (!bfd_check_format (sym_bfd, bfd_object))
8955 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
8962 /* Try to open DWO file FILE_NAME.
8963 COMP_DIR is the DW_AT_comp_dir attribute.
8964 The result is the bfd handle of the file.
8965 If there is a problem finding or opening the file, return NULL.
8966 Upon success, the canonicalized path of the file is stored in the bfd,
8967 same as symfile_bfd_open. */
8970 open_dwo_file (const char *file_name, const char *comp_dir)
8974 if (IS_ABSOLUTE_PATH (file_name))
8975 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
8977 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
8979 if (comp_dir != NULL)
8981 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
8983 /* NOTE: If comp_dir is a relative path, this will also try the
8984 search path, which seems useful. */
8985 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/);
8986 xfree (path_to_try);
8991 /* That didn't work, try debug-file-directory, which, despite its name,
8992 is a list of paths. */
8994 if (*debug_file_directory == '\0')
8997 return try_open_dwop_file (file_name, 0 /*is_dwp*/);
9000 /* This function is mapped across the sections and remembers the offset and
9001 size of each of the DWO debugging sections we are interested in. */
9004 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9006 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9007 const struct dwop_section_names *names = &dwop_section_names;
9009 if (section_is_p (sectp->name, &names->abbrev_dwo))
9011 dwo_sections->abbrev.asection = sectp;
9012 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9014 else if (section_is_p (sectp->name, &names->info_dwo))
9016 dwo_sections->info.asection = sectp;
9017 dwo_sections->info.size = bfd_get_section_size (sectp);
9019 else if (section_is_p (sectp->name, &names->line_dwo))
9021 dwo_sections->line.asection = sectp;
9022 dwo_sections->line.size = bfd_get_section_size (sectp);
9024 else if (section_is_p (sectp->name, &names->loc_dwo))
9026 dwo_sections->loc.asection = sectp;
9027 dwo_sections->loc.size = bfd_get_section_size (sectp);
9029 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9031 dwo_sections->macinfo.asection = sectp;
9032 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9034 else if (section_is_p (sectp->name, &names->macro_dwo))
9036 dwo_sections->macro.asection = sectp;
9037 dwo_sections->macro.size = bfd_get_section_size (sectp);
9039 else if (section_is_p (sectp->name, &names->str_dwo))
9041 dwo_sections->str.asection = sectp;
9042 dwo_sections->str.size = bfd_get_section_size (sectp);
9044 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9046 dwo_sections->str_offsets.asection = sectp;
9047 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9049 else if (section_is_p (sectp->name, &names->types_dwo))
9051 struct dwarf2_section_info type_section;
9053 memset (&type_section, 0, sizeof (type_section));
9054 type_section.asection = sectp;
9055 type_section.size = bfd_get_section_size (sectp);
9056 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9061 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9063 The result is NULL if DWO_NAME can't be found. */
9065 static struct dwo_file *
9066 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9067 const char *dwo_name, const char *comp_dir)
9069 struct objfile *objfile = dwarf2_per_objfile->objfile;
9070 struct dwo_file *dwo_file;
9072 struct cleanup *cleanups;
9074 dbfd = open_dwo_file (dwo_name, comp_dir);
9077 if (dwarf2_read_debug)
9078 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9081 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9082 dwo_file->dwo_name = dwo_name;
9083 dwo_file->comp_dir = comp_dir;
9084 dwo_file->dbfd = dbfd;
9086 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9088 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9090 dwo_file->cus = create_dwo_debug_info_hash_table (dwo_file);
9092 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9093 dwo_file->sections.types);
9095 discard_cleanups (cleanups);
9097 if (dwarf2_read_debug)
9098 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9103 /* This function is mapped across the sections and remembers the offset and
9104 size of each of the DWP debugging sections we are interested in. */
9107 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9109 struct dwp_file *dwp_file = dwp_file_ptr;
9110 const struct dwop_section_names *names = &dwop_section_names;
9111 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9113 /* Record the ELF section number for later lookup: this is what the
9114 .debug_cu_index,.debug_tu_index tables use. */
9115 gdb_assert (elf_section_nr < dwp_file->num_sections);
9116 dwp_file->elf_sections[elf_section_nr] = sectp;
9118 /* Look for specific sections that we need. */
9119 if (section_is_p (sectp->name, &names->str_dwo))
9121 dwp_file->sections.str.asection = sectp;
9122 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9124 else if (section_is_p (sectp->name, &names->cu_index))
9126 dwp_file->sections.cu_index.asection = sectp;
9127 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9129 else if (section_is_p (sectp->name, &names->tu_index))
9131 dwp_file->sections.tu_index.asection = sectp;
9132 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9136 /* Hash function for dwp_file loaded CUs/TUs. */
9139 hash_dwp_loaded_cutus (const void *item)
9141 const struct dwo_unit *dwo_unit = item;
9143 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9144 return dwo_unit->signature;
9147 /* Equality function for dwp_file loaded CUs/TUs. */
9150 eq_dwp_loaded_cutus (const void *a, const void *b)
9152 const struct dwo_unit *dua = a;
9153 const struct dwo_unit *dub = b;
9155 return dua->signature == dub->signature;
9158 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9161 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9163 return htab_create_alloc_ex (3,
9164 hash_dwp_loaded_cutus,
9165 eq_dwp_loaded_cutus,
9167 &objfile->objfile_obstack,
9168 hashtab_obstack_allocate,
9169 dummy_obstack_deallocate);
9172 /* Try to open DWP file FILE_NAME.
9173 The result is the bfd handle of the file.
9174 If there is a problem finding or opening the file, return NULL.
9175 Upon success, the canonicalized path of the file is stored in the bfd,
9176 same as symfile_bfd_open. */
9179 open_dwp_file (const char *file_name)
9181 return try_open_dwop_file (file_name, 1 /*is_dwp*/);
9184 /* Initialize the use of the DWP file for the current objfile.
9185 By convention the name of the DWP file is ${objfile}.dwp.
9186 The result is NULL if it can't be found. */
9188 static struct dwp_file *
9189 open_and_init_dwp_file (void)
9191 struct objfile *objfile = dwarf2_per_objfile->objfile;
9192 struct dwp_file *dwp_file;
9195 struct cleanup *cleanups;
9197 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9198 cleanups = make_cleanup (xfree, dwp_name);
9200 dbfd = open_dwp_file (dwp_name);
9203 if (dwarf2_read_debug)
9204 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9205 do_cleanups (cleanups);
9208 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9209 dwp_file->name = obstack_copy0 (&objfile->objfile_obstack,
9210 dwp_name, strlen (dwp_name));
9211 dwp_file->dbfd = dbfd;
9212 do_cleanups (cleanups);
9214 /* +1: section 0 is unused */
9215 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9216 dwp_file->elf_sections =
9217 OBSTACK_CALLOC (&objfile->objfile_obstack,
9218 dwp_file->num_sections, asection *);
9220 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9222 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9224 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9226 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9228 if (dwarf2_read_debug)
9230 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9231 fprintf_unfiltered (gdb_stdlog,
9232 " %u CUs, %u TUs\n",
9233 dwp_file->cus ? dwp_file->cus->nr_units : 0,
9234 dwp_file->tus ? dwp_file->tus->nr_units : 0);
9240 /* Wrapper around open_and_init_dwp_file, only open it once. */
9242 static struct dwp_file *
9245 if (! dwarf2_per_objfile->dwp_checked)
9247 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9248 dwarf2_per_objfile->dwp_checked = 1;
9250 return dwarf2_per_objfile->dwp_file;
9253 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9254 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9255 or in the DWP file for the objfile, referenced by THIS_UNIT.
9256 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9257 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9259 This is called, for example, when wanting to read a variable with a
9260 complex location. Therefore we don't want to do file i/o for every call.
9261 Therefore we don't want to look for a DWO file on every call.
9262 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9263 then we check if we've already seen DWO_NAME, and only THEN do we check
9266 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9267 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9269 static struct dwo_unit *
9270 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9271 const char *dwo_name, const char *comp_dir,
9272 ULONGEST signature, int is_debug_types)
9274 struct objfile *objfile = dwarf2_per_objfile->objfile;
9275 const char *kind = is_debug_types ? "TU" : "CU";
9276 void **dwo_file_slot;
9277 struct dwo_file *dwo_file;
9278 struct dwp_file *dwp_file;
9280 /* Have we already read SIGNATURE from a DWP file? */
9282 dwp_file = get_dwp_file ();
9283 if (dwp_file != NULL)
9285 const struct dwp_hash_table *dwp_htab =
9286 is_debug_types ? dwp_file->tus : dwp_file->cus;
9288 if (dwp_htab != NULL)
9290 struct dwo_unit *dwo_cutu =
9291 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9292 signature, is_debug_types);
9294 if (dwo_cutu != NULL)
9296 if (dwarf2_read_debug)
9298 fprintf_unfiltered (gdb_stdlog,
9299 "Virtual DWO %s %s found: @%s\n",
9300 kind, hex_string (signature),
9301 host_address_to_string (dwo_cutu));
9308 /* Have we already seen DWO_NAME? */
9310 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9311 if (*dwo_file_slot == NULL)
9313 /* Read in the file and build a table of the DWOs it contains. */
9314 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9316 /* NOTE: This will be NULL if unable to open the file. */
9317 dwo_file = *dwo_file_slot;
9319 if (dwo_file != NULL)
9321 htab_t htab = is_debug_types ? dwo_file->tus : dwo_file->cus;
9325 struct dwo_unit find_dwo_cutu, *dwo_cutu;
9327 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9328 find_dwo_cutu.signature = signature;
9329 dwo_cutu = htab_find (htab, &find_dwo_cutu);
9331 if (dwo_cutu != NULL)
9333 if (dwarf2_read_debug)
9335 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9336 kind, dwo_name, hex_string (signature),
9337 host_address_to_string (dwo_cutu));
9344 /* We didn't find it. This could mean a dwo_id mismatch, or
9345 someone deleted the DWO/DWP file, or the search path isn't set up
9346 correctly to find the file. */
9348 if (dwarf2_read_debug)
9350 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9351 kind, dwo_name, hex_string (signature));
9354 complaint (&symfile_complaints,
9355 _("Could not find DWO %s referenced by CU at offset 0x%x"
9357 kind, this_unit->offset.sect_off, objfile->name);
9361 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9362 See lookup_dwo_cutu_unit for details. */
9364 static struct dwo_unit *
9365 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9366 const char *dwo_name, const char *comp_dir,
9369 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9372 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9373 See lookup_dwo_cutu_unit for details. */
9375 static struct dwo_unit *
9376 lookup_dwo_type_unit (struct signatured_type *this_tu,
9377 const char *dwo_name, const char *comp_dir)
9379 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9382 /* Free all resources associated with DWO_FILE.
9383 Close the DWO file and munmap the sections.
9384 All memory should be on the objfile obstack. */
9387 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9390 struct dwarf2_section_info *section;
9392 /* Note: dbfd is NULL for virtual DWO files. */
9393 gdb_bfd_unref (dwo_file->dbfd);
9395 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9398 /* Wrapper for free_dwo_file for use in cleanups. */
9401 free_dwo_file_cleanup (void *arg)
9403 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9404 struct objfile *objfile = dwarf2_per_objfile->objfile;
9406 free_dwo_file (dwo_file, objfile);
9409 /* Traversal function for free_dwo_files. */
9412 free_dwo_file_from_slot (void **slot, void *info)
9414 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9415 struct objfile *objfile = (struct objfile *) info;
9417 free_dwo_file (dwo_file, objfile);
9422 /* Free all resources associated with DWO_FILES. */
9425 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9427 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9430 /* Read in various DIEs. */
9432 /* qsort helper for inherit_abstract_dies. */
9435 unsigned_int_compar (const void *ap, const void *bp)
9437 unsigned int a = *(unsigned int *) ap;
9438 unsigned int b = *(unsigned int *) bp;
9440 return (a > b) - (b > a);
9443 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9444 Inherit only the children of the DW_AT_abstract_origin DIE not being
9445 already referenced by DW_AT_abstract_origin from the children of the
9449 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9451 struct die_info *child_die;
9452 unsigned die_children_count;
9453 /* CU offsets which were referenced by children of the current DIE. */
9454 sect_offset *offsets;
9455 sect_offset *offsets_end, *offsetp;
9456 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9457 struct die_info *origin_die;
9458 /* Iterator of the ORIGIN_DIE children. */
9459 struct die_info *origin_child_die;
9460 struct cleanup *cleanups;
9461 struct attribute *attr;
9462 struct dwarf2_cu *origin_cu;
9463 struct pending **origin_previous_list_in_scope;
9465 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9469 /* Note that following die references may follow to a die in a
9473 origin_die = follow_die_ref (die, attr, &origin_cu);
9475 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9477 origin_previous_list_in_scope = origin_cu->list_in_scope;
9478 origin_cu->list_in_scope = cu->list_in_scope;
9480 if (die->tag != origin_die->tag
9481 && !(die->tag == DW_TAG_inlined_subroutine
9482 && origin_die->tag == DW_TAG_subprogram))
9483 complaint (&symfile_complaints,
9484 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9485 die->offset.sect_off, origin_die->offset.sect_off);
9487 child_die = die->child;
9488 die_children_count = 0;
9489 while (child_die && child_die->tag)
9491 child_die = sibling_die (child_die);
9492 die_children_count++;
9494 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9495 cleanups = make_cleanup (xfree, offsets);
9497 offsets_end = offsets;
9498 child_die = die->child;
9499 while (child_die && child_die->tag)
9501 /* For each CHILD_DIE, find the corresponding child of
9502 ORIGIN_DIE. If there is more than one layer of
9503 DW_AT_abstract_origin, follow them all; there shouldn't be,
9504 but GCC versions at least through 4.4 generate this (GCC PR
9506 struct die_info *child_origin_die = child_die;
9507 struct dwarf2_cu *child_origin_cu = cu;
9511 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9515 child_origin_die = follow_die_ref (child_origin_die, attr,
9519 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9520 counterpart may exist. */
9521 if (child_origin_die != child_die)
9523 if (child_die->tag != child_origin_die->tag
9524 && !(child_die->tag == DW_TAG_inlined_subroutine
9525 && child_origin_die->tag == DW_TAG_subprogram))
9526 complaint (&symfile_complaints,
9527 _("Child DIE 0x%x and its abstract origin 0x%x have "
9528 "different tags"), child_die->offset.sect_off,
9529 child_origin_die->offset.sect_off);
9530 if (child_origin_die->parent != origin_die)
9531 complaint (&symfile_complaints,
9532 _("Child DIE 0x%x and its abstract origin 0x%x have "
9533 "different parents"), child_die->offset.sect_off,
9534 child_origin_die->offset.sect_off);
9536 *offsets_end++ = child_origin_die->offset;
9538 child_die = sibling_die (child_die);
9540 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9541 unsigned_int_compar);
9542 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9543 if (offsetp[-1].sect_off == offsetp->sect_off)
9544 complaint (&symfile_complaints,
9545 _("Multiple children of DIE 0x%x refer "
9546 "to DIE 0x%x as their abstract origin"),
9547 die->offset.sect_off, offsetp->sect_off);
9550 origin_child_die = origin_die->child;
9551 while (origin_child_die && origin_child_die->tag)
9553 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9554 while (offsetp < offsets_end
9555 && offsetp->sect_off < origin_child_die->offset.sect_off)
9557 if (offsetp >= offsets_end
9558 || offsetp->sect_off > origin_child_die->offset.sect_off)
9560 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9561 process_die (origin_child_die, origin_cu);
9563 origin_child_die = sibling_die (origin_child_die);
9565 origin_cu->list_in_scope = origin_previous_list_in_scope;
9567 do_cleanups (cleanups);
9571 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
9573 struct objfile *objfile = cu->objfile;
9574 struct context_stack *new;
9577 struct die_info *child_die;
9578 struct attribute *attr, *call_line, *call_file;
9581 struct block *block;
9582 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
9583 VEC (symbolp) *template_args = NULL;
9584 struct template_symbol *templ_func = NULL;
9588 /* If we do not have call site information, we can't show the
9589 caller of this inlined function. That's too confusing, so
9590 only use the scope for local variables. */
9591 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
9592 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
9593 if (call_line == NULL || call_file == NULL)
9595 read_lexical_block_scope (die, cu);
9600 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9602 name = dwarf2_name (die, cu);
9604 /* Ignore functions with missing or empty names. These are actually
9605 illegal according to the DWARF standard. */
9608 complaint (&symfile_complaints,
9609 _("missing name for subprogram DIE at %d"),
9610 die->offset.sect_off);
9614 /* Ignore functions with missing or invalid low and high pc attributes. */
9615 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9617 attr = dwarf2_attr (die, DW_AT_external, cu);
9618 if (!attr || !DW_UNSND (attr))
9619 complaint (&symfile_complaints,
9620 _("cannot get low and high bounds "
9621 "for subprogram DIE at %d"),
9622 die->offset.sect_off);
9629 /* If we have any template arguments, then we must allocate a
9630 different sort of symbol. */
9631 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
9633 if (child_die->tag == DW_TAG_template_type_param
9634 || child_die->tag == DW_TAG_template_value_param)
9636 templ_func = allocate_template_symbol (objfile);
9637 templ_func->base.is_cplus_template_function = 1;
9642 new = push_context (0, lowpc);
9643 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
9644 (struct symbol *) templ_func);
9646 /* If there is a location expression for DW_AT_frame_base, record
9648 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
9650 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
9652 cu->list_in_scope = &local_symbols;
9654 if (die->child != NULL)
9656 child_die = die->child;
9657 while (child_die && child_die->tag)
9659 if (child_die->tag == DW_TAG_template_type_param
9660 || child_die->tag == DW_TAG_template_value_param)
9662 struct symbol *arg = new_symbol (child_die, NULL, cu);
9665 VEC_safe_push (symbolp, template_args, arg);
9668 process_die (child_die, cu);
9669 child_die = sibling_die (child_die);
9673 inherit_abstract_dies (die, cu);
9675 /* If we have a DW_AT_specification, we might need to import using
9676 directives from the context of the specification DIE. See the
9677 comment in determine_prefix. */
9678 if (cu->language == language_cplus
9679 && dwarf2_attr (die, DW_AT_specification, cu))
9681 struct dwarf2_cu *spec_cu = cu;
9682 struct die_info *spec_die = die_specification (die, &spec_cu);
9686 child_die = spec_die->child;
9687 while (child_die && child_die->tag)
9689 if (child_die->tag == DW_TAG_imported_module)
9690 process_die (child_die, spec_cu);
9691 child_die = sibling_die (child_die);
9694 /* In some cases, GCC generates specification DIEs that
9695 themselves contain DW_AT_specification attributes. */
9696 spec_die = die_specification (spec_die, &spec_cu);
9700 new = pop_context ();
9701 /* Make a block for the local symbols within. */
9702 block = finish_block (new->name, &local_symbols, new->old_blocks,
9703 lowpc, highpc, objfile);
9705 /* For C++, set the block's scope. */
9706 if ((cu->language == language_cplus || cu->language == language_fortran)
9707 && cu->processing_has_namespace_info)
9708 block_set_scope (block, determine_prefix (die, cu),
9709 &objfile->objfile_obstack);
9711 /* If we have address ranges, record them. */
9712 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9714 /* Attach template arguments to function. */
9715 if (! VEC_empty (symbolp, template_args))
9717 gdb_assert (templ_func != NULL);
9719 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
9720 templ_func->template_arguments
9721 = obstack_alloc (&objfile->objfile_obstack,
9722 (templ_func->n_template_arguments
9723 * sizeof (struct symbol *)));
9724 memcpy (templ_func->template_arguments,
9725 VEC_address (symbolp, template_args),
9726 (templ_func->n_template_arguments * sizeof (struct symbol *)));
9727 VEC_free (symbolp, template_args);
9730 /* In C++, we can have functions nested inside functions (e.g., when
9731 a function declares a class that has methods). This means that
9732 when we finish processing a function scope, we may need to go
9733 back to building a containing block's symbol lists. */
9734 local_symbols = new->locals;
9735 using_directives = new->using_directives;
9737 /* If we've finished processing a top-level function, subsequent
9738 symbols go in the file symbol list. */
9739 if (outermost_context_p ())
9740 cu->list_in_scope = &file_symbols;
9743 /* Process all the DIES contained within a lexical block scope. Start
9744 a new scope, process the dies, and then close the scope. */
9747 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
9749 struct objfile *objfile = cu->objfile;
9750 struct context_stack *new;
9751 CORE_ADDR lowpc, highpc;
9752 struct die_info *child_die;
9755 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9757 /* Ignore blocks with missing or invalid low and high pc attributes. */
9758 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
9759 as multiple lexical blocks? Handling children in a sane way would
9760 be nasty. Might be easier to properly extend generic blocks to
9762 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9767 push_context (0, lowpc);
9768 if (die->child != NULL)
9770 child_die = die->child;
9771 while (child_die && child_die->tag)
9773 process_die (child_die, cu);
9774 child_die = sibling_die (child_die);
9777 new = pop_context ();
9779 if (local_symbols != NULL || using_directives != NULL)
9782 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
9785 /* Note that recording ranges after traversing children, as we
9786 do here, means that recording a parent's ranges entails
9787 walking across all its children's ranges as they appear in
9788 the address map, which is quadratic behavior.
9790 It would be nicer to record the parent's ranges before
9791 traversing its children, simply overriding whatever you find
9792 there. But since we don't even decide whether to create a
9793 block until after we've traversed its children, that's hard
9795 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9797 local_symbols = new->locals;
9798 using_directives = new->using_directives;
9801 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
9804 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
9806 struct objfile *objfile = cu->objfile;
9807 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9808 CORE_ADDR pc, baseaddr;
9809 struct attribute *attr;
9810 struct call_site *call_site, call_site_local;
9813 struct die_info *child_die;
9815 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9817 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
9820 complaint (&symfile_complaints,
9821 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
9822 "DIE 0x%x [in module %s]"),
9823 die->offset.sect_off, objfile->name);
9826 pc = DW_ADDR (attr) + baseaddr;
9828 if (cu->call_site_htab == NULL)
9829 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
9830 NULL, &objfile->objfile_obstack,
9831 hashtab_obstack_allocate, NULL);
9832 call_site_local.pc = pc;
9833 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
9836 complaint (&symfile_complaints,
9837 _("Duplicate PC %s for DW_TAG_GNU_call_site "
9838 "DIE 0x%x [in module %s]"),
9839 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
9843 /* Count parameters at the caller. */
9846 for (child_die = die->child; child_die && child_die->tag;
9847 child_die = sibling_die (child_die))
9849 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
9851 complaint (&symfile_complaints,
9852 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
9853 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9854 child_die->tag, child_die->offset.sect_off, objfile->name);
9861 call_site = obstack_alloc (&objfile->objfile_obstack,
9862 (sizeof (*call_site)
9863 + (sizeof (*call_site->parameter)
9866 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
9869 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
9871 struct die_info *func_die;
9873 /* Skip also over DW_TAG_inlined_subroutine. */
9874 for (func_die = die->parent;
9875 func_die && func_die->tag != DW_TAG_subprogram
9876 && func_die->tag != DW_TAG_subroutine_type;
9877 func_die = func_die->parent);
9879 /* DW_AT_GNU_all_call_sites is a superset
9880 of DW_AT_GNU_all_tail_call_sites. */
9882 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
9883 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
9885 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
9886 not complete. But keep CALL_SITE for look ups via call_site_htab,
9887 both the initial caller containing the real return address PC and
9888 the final callee containing the current PC of a chain of tail
9889 calls do not need to have the tail call list complete. But any
9890 function candidate for a virtual tail call frame searched via
9891 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
9892 determined unambiguously. */
9896 struct type *func_type = NULL;
9899 func_type = get_die_type (func_die, cu);
9900 if (func_type != NULL)
9902 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
9904 /* Enlist this call site to the function. */
9905 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
9906 TYPE_TAIL_CALL_LIST (func_type) = call_site;
9909 complaint (&symfile_complaints,
9910 _("Cannot find function owning DW_TAG_GNU_call_site "
9911 "DIE 0x%x [in module %s]"),
9912 die->offset.sect_off, objfile->name);
9916 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
9918 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9919 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
9920 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
9921 /* Keep NULL DWARF_BLOCK. */;
9922 else if (attr_form_is_block (attr))
9924 struct dwarf2_locexpr_baton *dlbaton;
9926 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
9927 dlbaton->data = DW_BLOCK (attr)->data;
9928 dlbaton->size = DW_BLOCK (attr)->size;
9929 dlbaton->per_cu = cu->per_cu;
9931 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
9933 else if (is_ref_attr (attr))
9935 struct dwarf2_cu *target_cu = cu;
9936 struct die_info *target_die;
9938 target_die = follow_die_ref_or_sig (die, attr, &target_cu);
9939 gdb_assert (target_cu->objfile == objfile);
9940 if (die_is_declaration (target_die, target_cu))
9942 const char *target_physname = NULL;
9943 struct attribute *target_attr;
9945 /* Prefer the mangled name; otherwise compute the demangled one. */
9946 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
9947 if (target_attr == NULL)
9948 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
9950 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
9951 target_physname = DW_STRING (target_attr);
9953 target_physname = dwarf2_physname (NULL, target_die, target_cu);
9954 if (target_physname == NULL)
9955 complaint (&symfile_complaints,
9956 _("DW_AT_GNU_call_site_target target DIE has invalid "
9957 "physname, for referencing DIE 0x%x [in module %s]"),
9958 die->offset.sect_off, objfile->name);
9960 SET_FIELD_PHYSNAME (call_site->target, target_physname);
9966 /* DW_AT_entry_pc should be preferred. */
9967 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
9968 complaint (&symfile_complaints,
9969 _("DW_AT_GNU_call_site_target target DIE has invalid "
9970 "low pc, for referencing DIE 0x%x [in module %s]"),
9971 die->offset.sect_off, objfile->name);
9973 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
9977 complaint (&symfile_complaints,
9978 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
9979 "block nor reference, for DIE 0x%x [in module %s]"),
9980 die->offset.sect_off, objfile->name);
9982 call_site->per_cu = cu->per_cu;
9984 for (child_die = die->child;
9985 child_die && child_die->tag;
9986 child_die = sibling_die (child_die))
9988 struct call_site_parameter *parameter;
9989 struct attribute *loc, *origin;
9991 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
9993 /* Already printed the complaint above. */
9997 gdb_assert (call_site->parameter_count < nparams);
9998 parameter = &call_site->parameter[call_site->parameter_count];
10000 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10001 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10002 register is contained in DW_AT_GNU_call_site_value. */
10004 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10005 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10006 if (loc == NULL && origin != NULL && is_ref_attr (origin))
10008 sect_offset offset;
10010 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10011 offset = dwarf2_get_ref_die_offset (origin);
10012 if (!offset_in_cu_p (&cu->header, offset))
10014 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10015 binding can be done only inside one CU. Such referenced DIE
10016 therefore cannot be even moved to DW_TAG_partial_unit. */
10017 complaint (&symfile_complaints,
10018 _("DW_AT_abstract_origin offset is not in CU for "
10019 "DW_TAG_GNU_call_site child DIE 0x%x "
10021 child_die->offset.sect_off, objfile->name);
10024 parameter->u.param_offset.cu_off = (offset.sect_off
10025 - cu->header.offset.sect_off);
10027 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10029 complaint (&symfile_complaints,
10030 _("No DW_FORM_block* DW_AT_location for "
10031 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10032 child_die->offset.sect_off, objfile->name);
10037 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10038 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10039 if (parameter->u.dwarf_reg != -1)
10040 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10041 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10042 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10043 ¶meter->u.fb_offset))
10044 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10047 complaint (&symfile_complaints,
10048 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10049 "for DW_FORM_block* DW_AT_location is supported for "
10050 "DW_TAG_GNU_call_site child DIE 0x%x "
10052 child_die->offset.sect_off, objfile->name);
10057 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10058 if (!attr_form_is_block (attr))
10060 complaint (&symfile_complaints,
10061 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10062 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10063 child_die->offset.sect_off, objfile->name);
10066 parameter->value = DW_BLOCK (attr)->data;
10067 parameter->value_size = DW_BLOCK (attr)->size;
10069 /* Parameters are not pre-cleared by memset above. */
10070 parameter->data_value = NULL;
10071 parameter->data_value_size = 0;
10072 call_site->parameter_count++;
10074 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10077 if (!attr_form_is_block (attr))
10078 complaint (&symfile_complaints,
10079 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10080 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10081 child_die->offset.sect_off, objfile->name);
10084 parameter->data_value = DW_BLOCK (attr)->data;
10085 parameter->data_value_size = DW_BLOCK (attr)->size;
10091 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10092 Return 1 if the attributes are present and valid, otherwise, return 0.
10093 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10096 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10097 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10098 struct partial_symtab *ranges_pst)
10100 struct objfile *objfile = cu->objfile;
10101 struct comp_unit_head *cu_header = &cu->header;
10102 bfd *obfd = objfile->obfd;
10103 unsigned int addr_size = cu_header->addr_size;
10104 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10105 /* Base address selection entry. */
10108 unsigned int dummy;
10109 const gdb_byte *buffer;
10113 CORE_ADDR high = 0;
10114 CORE_ADDR baseaddr;
10116 found_base = cu->base_known;
10117 base = cu->base_address;
10119 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10120 if (offset >= dwarf2_per_objfile->ranges.size)
10122 complaint (&symfile_complaints,
10123 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10127 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10129 /* Read in the largest possible address. */
10130 marker = read_address (obfd, buffer, cu, &dummy);
10131 if ((marker & mask) == mask)
10133 /* If we found the largest possible address, then
10134 read the base address. */
10135 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10136 buffer += 2 * addr_size;
10137 offset += 2 * addr_size;
10143 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10147 CORE_ADDR range_beginning, range_end;
10149 range_beginning = read_address (obfd, buffer, cu, &dummy);
10150 buffer += addr_size;
10151 range_end = read_address (obfd, buffer, cu, &dummy);
10152 buffer += addr_size;
10153 offset += 2 * addr_size;
10155 /* An end of list marker is a pair of zero addresses. */
10156 if (range_beginning == 0 && range_end == 0)
10157 /* Found the end of list entry. */
10160 /* Each base address selection entry is a pair of 2 values.
10161 The first is the largest possible address, the second is
10162 the base address. Check for a base address here. */
10163 if ((range_beginning & mask) == mask)
10165 /* If we found the largest possible address, then
10166 read the base address. */
10167 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10174 /* We have no valid base address for the ranges
10176 complaint (&symfile_complaints,
10177 _("Invalid .debug_ranges data (no base address)"));
10181 if (range_beginning > range_end)
10183 /* Inverted range entries are invalid. */
10184 complaint (&symfile_complaints,
10185 _("Invalid .debug_ranges data (inverted range)"));
10189 /* Empty range entries have no effect. */
10190 if (range_beginning == range_end)
10193 range_beginning += base;
10196 /* A not-uncommon case of bad debug info.
10197 Don't pollute the addrmap with bad data. */
10198 if (range_beginning + baseaddr == 0
10199 && !dwarf2_per_objfile->has_section_at_zero)
10201 complaint (&symfile_complaints,
10202 _(".debug_ranges entry has start address of zero"
10203 " [in module %s]"), objfile->name);
10207 if (ranges_pst != NULL)
10208 addrmap_set_empty (objfile->psymtabs_addrmap,
10209 range_beginning + baseaddr,
10210 range_end - 1 + baseaddr,
10213 /* FIXME: This is recording everything as a low-high
10214 segment of consecutive addresses. We should have a
10215 data structure for discontiguous block ranges
10219 low = range_beginning;
10225 if (range_beginning < low)
10226 low = range_beginning;
10227 if (range_end > high)
10233 /* If the first entry is an end-of-list marker, the range
10234 describes an empty scope, i.e. no instructions. */
10240 *high_return = high;
10244 /* Get low and high pc attributes from a die. Return 1 if the attributes
10245 are present and valid, otherwise, return 0. Return -1 if the range is
10246 discontinuous, i.e. derived from DW_AT_ranges information. */
10249 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10250 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10251 struct partial_symtab *pst)
10253 struct attribute *attr;
10254 struct attribute *attr_high;
10256 CORE_ADDR high = 0;
10259 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10262 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10265 low = DW_ADDR (attr);
10266 if (attr_high->form == DW_FORM_addr
10267 || attr_high->form == DW_FORM_GNU_addr_index)
10268 high = DW_ADDR (attr_high);
10270 high = low + DW_UNSND (attr_high);
10273 /* Found high w/o low attribute. */
10276 /* Found consecutive range of addresses. */
10281 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10284 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10285 We take advantage of the fact that DW_AT_ranges does not appear
10286 in DW_TAG_compile_unit of DWO files. */
10287 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10288 unsigned int ranges_offset = (DW_UNSND (attr)
10289 + (need_ranges_base
10293 /* Value of the DW_AT_ranges attribute is the offset in the
10294 .debug_ranges section. */
10295 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10297 /* Found discontinuous range of addresses. */
10302 /* read_partial_die has also the strict LOW < HIGH requirement. */
10306 /* When using the GNU linker, .gnu.linkonce. sections are used to
10307 eliminate duplicate copies of functions and vtables and such.
10308 The linker will arbitrarily choose one and discard the others.
10309 The AT_*_pc values for such functions refer to local labels in
10310 these sections. If the section from that file was discarded, the
10311 labels are not in the output, so the relocs get a value of 0.
10312 If this is a discarded function, mark the pc bounds as invalid,
10313 so that GDB will ignore it. */
10314 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10323 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10324 its low and high PC addresses. Do nothing if these addresses could not
10325 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10326 and HIGHPC to the high address if greater than HIGHPC. */
10329 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10330 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10331 struct dwarf2_cu *cu)
10333 CORE_ADDR low, high;
10334 struct die_info *child = die->child;
10336 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10338 *lowpc = min (*lowpc, low);
10339 *highpc = max (*highpc, high);
10342 /* If the language does not allow nested subprograms (either inside
10343 subprograms or lexical blocks), we're done. */
10344 if (cu->language != language_ada)
10347 /* Check all the children of the given DIE. If it contains nested
10348 subprograms, then check their pc bounds. Likewise, we need to
10349 check lexical blocks as well, as they may also contain subprogram
10351 while (child && child->tag)
10353 if (child->tag == DW_TAG_subprogram
10354 || child->tag == DW_TAG_lexical_block)
10355 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10356 child = sibling_die (child);
10360 /* Get the low and high pc's represented by the scope DIE, and store
10361 them in *LOWPC and *HIGHPC. If the correct values can't be
10362 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10365 get_scope_pc_bounds (struct die_info *die,
10366 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10367 struct dwarf2_cu *cu)
10369 CORE_ADDR best_low = (CORE_ADDR) -1;
10370 CORE_ADDR best_high = (CORE_ADDR) 0;
10371 CORE_ADDR current_low, current_high;
10373 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10375 best_low = current_low;
10376 best_high = current_high;
10380 struct die_info *child = die->child;
10382 while (child && child->tag)
10384 switch (child->tag) {
10385 case DW_TAG_subprogram:
10386 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10388 case DW_TAG_namespace:
10389 case DW_TAG_module:
10390 /* FIXME: carlton/2004-01-16: Should we do this for
10391 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10392 that current GCC's always emit the DIEs corresponding
10393 to definitions of methods of classes as children of a
10394 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10395 the DIEs giving the declarations, which could be
10396 anywhere). But I don't see any reason why the
10397 standards says that they have to be there. */
10398 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10400 if (current_low != ((CORE_ADDR) -1))
10402 best_low = min (best_low, current_low);
10403 best_high = max (best_high, current_high);
10411 child = sibling_die (child);
10416 *highpc = best_high;
10419 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10423 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10424 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10426 struct objfile *objfile = cu->objfile;
10427 struct attribute *attr;
10428 struct attribute *attr_high;
10430 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10433 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10436 CORE_ADDR low = DW_ADDR (attr);
10438 if (attr_high->form == DW_FORM_addr
10439 || attr_high->form == DW_FORM_GNU_addr_index)
10440 high = DW_ADDR (attr_high);
10442 high = low + DW_UNSND (attr_high);
10444 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10448 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10451 bfd *obfd = objfile->obfd;
10452 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10453 We take advantage of the fact that DW_AT_ranges does not appear
10454 in DW_TAG_compile_unit of DWO files. */
10455 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10457 /* The value of the DW_AT_ranges attribute is the offset of the
10458 address range list in the .debug_ranges section. */
10459 unsigned long offset = (DW_UNSND (attr)
10460 + (need_ranges_base ? cu->ranges_base : 0));
10461 const gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset;
10463 /* For some target architectures, but not others, the
10464 read_address function sign-extends the addresses it returns.
10465 To recognize base address selection entries, we need a
10467 unsigned int addr_size = cu->header.addr_size;
10468 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10470 /* The base address, to which the next pair is relative. Note
10471 that this 'base' is a DWARF concept: most entries in a range
10472 list are relative, to reduce the number of relocs against the
10473 debugging information. This is separate from this function's
10474 'baseaddr' argument, which GDB uses to relocate debugging
10475 information from a shared library based on the address at
10476 which the library was loaded. */
10477 CORE_ADDR base = cu->base_address;
10478 int base_known = cu->base_known;
10480 gdb_assert (dwarf2_per_objfile->ranges.readin);
10481 if (offset >= dwarf2_per_objfile->ranges.size)
10483 complaint (&symfile_complaints,
10484 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10491 unsigned int bytes_read;
10492 CORE_ADDR start, end;
10494 start = read_address (obfd, buffer, cu, &bytes_read);
10495 buffer += bytes_read;
10496 end = read_address (obfd, buffer, cu, &bytes_read);
10497 buffer += bytes_read;
10499 /* Did we find the end of the range list? */
10500 if (start == 0 && end == 0)
10503 /* Did we find a base address selection entry? */
10504 else if ((start & base_select_mask) == base_select_mask)
10510 /* We found an ordinary address range. */
10515 complaint (&symfile_complaints,
10516 _("Invalid .debug_ranges data "
10517 "(no base address)"));
10523 /* Inverted range entries are invalid. */
10524 complaint (&symfile_complaints,
10525 _("Invalid .debug_ranges data "
10526 "(inverted range)"));
10530 /* Empty range entries have no effect. */
10534 start += base + baseaddr;
10535 end += base + baseaddr;
10537 /* A not-uncommon case of bad debug info.
10538 Don't pollute the addrmap with bad data. */
10539 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10541 complaint (&symfile_complaints,
10542 _(".debug_ranges entry has start address of zero"
10543 " [in module %s]"), objfile->name);
10547 record_block_range (block, start, end - 1);
10553 /* Check whether the producer field indicates either of GCC < 4.6, or the
10554 Intel C/C++ compiler, and cache the result in CU. */
10557 check_producer (struct dwarf2_cu *cu)
10560 int major, minor, release;
10562 if (cu->producer == NULL)
10564 /* For unknown compilers expect their behavior is DWARF version
10567 GCC started to support .debug_types sections by -gdwarf-4 since
10568 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
10569 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
10570 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
10571 interpreted incorrectly by GDB now - GCC PR debug/48229. */
10573 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
10575 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
10577 cs = &cu->producer[strlen ("GNU ")];
10578 while (*cs && !isdigit (*cs))
10580 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
10582 /* Not recognized as GCC. */
10586 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
10587 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
10590 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
10591 cu->producer_is_icc = 1;
10594 /* For other non-GCC compilers, expect their behavior is DWARF version
10598 cu->checked_producer = 1;
10601 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
10602 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
10603 during 4.6.0 experimental. */
10606 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
10608 if (!cu->checked_producer)
10609 check_producer (cu);
10611 return cu->producer_is_gxx_lt_4_6;
10614 /* Return the default accessibility type if it is not overriden by
10615 DW_AT_accessibility. */
10617 static enum dwarf_access_attribute
10618 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
10620 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
10622 /* The default DWARF 2 accessibility for members is public, the default
10623 accessibility for inheritance is private. */
10625 if (die->tag != DW_TAG_inheritance)
10626 return DW_ACCESS_public;
10628 return DW_ACCESS_private;
10632 /* DWARF 3+ defines the default accessibility a different way. The same
10633 rules apply now for DW_TAG_inheritance as for the members and it only
10634 depends on the container kind. */
10636 if (die->parent->tag == DW_TAG_class_type)
10637 return DW_ACCESS_private;
10639 return DW_ACCESS_public;
10643 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
10644 offset. If the attribute was not found return 0, otherwise return
10645 1. If it was found but could not properly be handled, set *OFFSET
10649 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
10652 struct attribute *attr;
10654 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
10659 /* Note that we do not check for a section offset first here.
10660 This is because DW_AT_data_member_location is new in DWARF 4,
10661 so if we see it, we can assume that a constant form is really
10662 a constant and not a section offset. */
10663 if (attr_form_is_constant (attr))
10664 *offset = dwarf2_get_attr_constant_value (attr, 0);
10665 else if (attr_form_is_section_offset (attr))
10666 dwarf2_complex_location_expr_complaint ();
10667 else if (attr_form_is_block (attr))
10668 *offset = decode_locdesc (DW_BLOCK (attr), cu);
10670 dwarf2_complex_location_expr_complaint ();
10678 /* Add an aggregate field to the field list. */
10681 dwarf2_add_field (struct field_info *fip, struct die_info *die,
10682 struct dwarf2_cu *cu)
10684 struct objfile *objfile = cu->objfile;
10685 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10686 struct nextfield *new_field;
10687 struct attribute *attr;
10689 const char *fieldname = "";
10691 /* Allocate a new field list entry and link it in. */
10692 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
10693 make_cleanup (xfree, new_field);
10694 memset (new_field, 0, sizeof (struct nextfield));
10696 if (die->tag == DW_TAG_inheritance)
10698 new_field->next = fip->baseclasses;
10699 fip->baseclasses = new_field;
10703 new_field->next = fip->fields;
10704 fip->fields = new_field;
10708 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
10710 new_field->accessibility = DW_UNSND (attr);
10712 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
10713 if (new_field->accessibility != DW_ACCESS_public)
10714 fip->non_public_fields = 1;
10716 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
10718 new_field->virtuality = DW_UNSND (attr);
10720 new_field->virtuality = DW_VIRTUALITY_none;
10722 fp = &new_field->field;
10724 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
10728 /* Data member other than a C++ static data member. */
10730 /* Get type of field. */
10731 fp->type = die_type (die, cu);
10733 SET_FIELD_BITPOS (*fp, 0);
10735 /* Get bit size of field (zero if none). */
10736 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
10739 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
10743 FIELD_BITSIZE (*fp) = 0;
10746 /* Get bit offset of field. */
10747 if (handle_data_member_location (die, cu, &offset))
10748 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10749 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
10752 if (gdbarch_bits_big_endian (gdbarch))
10754 /* For big endian bits, the DW_AT_bit_offset gives the
10755 additional bit offset from the MSB of the containing
10756 anonymous object to the MSB of the field. We don't
10757 have to do anything special since we don't need to
10758 know the size of the anonymous object. */
10759 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
10763 /* For little endian bits, compute the bit offset to the
10764 MSB of the anonymous object, subtract off the number of
10765 bits from the MSB of the field to the MSB of the
10766 object, and then subtract off the number of bits of
10767 the field itself. The result is the bit offset of
10768 the LSB of the field. */
10769 int anonymous_size;
10770 int bit_offset = DW_UNSND (attr);
10772 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
10775 /* The size of the anonymous object containing
10776 the bit field is explicit, so use the
10777 indicated size (in bytes). */
10778 anonymous_size = DW_UNSND (attr);
10782 /* The size of the anonymous object containing
10783 the bit field must be inferred from the type
10784 attribute of the data member containing the
10786 anonymous_size = TYPE_LENGTH (fp->type);
10788 SET_FIELD_BITPOS (*fp,
10789 (FIELD_BITPOS (*fp)
10790 + anonymous_size * bits_per_byte
10791 - bit_offset - FIELD_BITSIZE (*fp)));
10795 /* Get name of field. */
10796 fieldname = dwarf2_name (die, cu);
10797 if (fieldname == NULL)
10800 /* The name is already allocated along with this objfile, so we don't
10801 need to duplicate it for the type. */
10802 fp->name = fieldname;
10804 /* Change accessibility for artificial fields (e.g. virtual table
10805 pointer or virtual base class pointer) to private. */
10806 if (dwarf2_attr (die, DW_AT_artificial, cu))
10808 FIELD_ARTIFICIAL (*fp) = 1;
10809 new_field->accessibility = DW_ACCESS_private;
10810 fip->non_public_fields = 1;
10813 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
10815 /* C++ static member. */
10817 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
10818 is a declaration, but all versions of G++ as of this writing
10819 (so through at least 3.2.1) incorrectly generate
10820 DW_TAG_variable tags. */
10822 const char *physname;
10824 /* Get name of field. */
10825 fieldname = dwarf2_name (die, cu);
10826 if (fieldname == NULL)
10829 attr = dwarf2_attr (die, DW_AT_const_value, cu);
10831 /* Only create a symbol if this is an external value.
10832 new_symbol checks this and puts the value in the global symbol
10833 table, which we want. If it is not external, new_symbol
10834 will try to put the value in cu->list_in_scope which is wrong. */
10835 && dwarf2_flag_true_p (die, DW_AT_external, cu))
10837 /* A static const member, not much different than an enum as far as
10838 we're concerned, except that we can support more types. */
10839 new_symbol (die, NULL, cu);
10842 /* Get physical name. */
10843 physname = dwarf2_physname (fieldname, die, cu);
10845 /* The name is already allocated along with this objfile, so we don't
10846 need to duplicate it for the type. */
10847 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
10848 FIELD_TYPE (*fp) = die_type (die, cu);
10849 FIELD_NAME (*fp) = fieldname;
10851 else if (die->tag == DW_TAG_inheritance)
10855 /* C++ base class field. */
10856 if (handle_data_member_location (die, cu, &offset))
10857 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10858 FIELD_BITSIZE (*fp) = 0;
10859 FIELD_TYPE (*fp) = die_type (die, cu);
10860 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
10861 fip->nbaseclasses++;
10865 /* Add a typedef defined in the scope of the FIP's class. */
10868 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
10869 struct dwarf2_cu *cu)
10871 struct objfile *objfile = cu->objfile;
10872 struct typedef_field_list *new_field;
10873 struct attribute *attr;
10874 struct typedef_field *fp;
10875 char *fieldname = "";
10877 /* Allocate a new field list entry and link it in. */
10878 new_field = xzalloc (sizeof (*new_field));
10879 make_cleanup (xfree, new_field);
10881 gdb_assert (die->tag == DW_TAG_typedef);
10883 fp = &new_field->field;
10885 /* Get name of field. */
10886 fp->name = dwarf2_name (die, cu);
10887 if (fp->name == NULL)
10890 fp->type = read_type_die (die, cu);
10892 new_field->next = fip->typedef_field_list;
10893 fip->typedef_field_list = new_field;
10894 fip->typedef_field_list_count++;
10897 /* Create the vector of fields, and attach it to the type. */
10900 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
10901 struct dwarf2_cu *cu)
10903 int nfields = fip->nfields;
10905 /* Record the field count, allocate space for the array of fields,
10906 and create blank accessibility bitfields if necessary. */
10907 TYPE_NFIELDS (type) = nfields;
10908 TYPE_FIELDS (type) = (struct field *)
10909 TYPE_ALLOC (type, sizeof (struct field) * nfields);
10910 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
10912 if (fip->non_public_fields && cu->language != language_ada)
10914 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10916 TYPE_FIELD_PRIVATE_BITS (type) =
10917 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10918 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
10920 TYPE_FIELD_PROTECTED_BITS (type) =
10921 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10922 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
10924 TYPE_FIELD_IGNORE_BITS (type) =
10925 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10926 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
10929 /* If the type has baseclasses, allocate and clear a bit vector for
10930 TYPE_FIELD_VIRTUAL_BITS. */
10931 if (fip->nbaseclasses && cu->language != language_ada)
10933 int num_bytes = B_BYTES (fip->nbaseclasses);
10934 unsigned char *pointer;
10936 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10937 pointer = TYPE_ALLOC (type, num_bytes);
10938 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
10939 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
10940 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
10943 /* Copy the saved-up fields into the field vector. Start from the head of
10944 the list, adding to the tail of the field array, so that they end up in
10945 the same order in the array in which they were added to the list. */
10946 while (nfields-- > 0)
10948 struct nextfield *fieldp;
10952 fieldp = fip->fields;
10953 fip->fields = fieldp->next;
10957 fieldp = fip->baseclasses;
10958 fip->baseclasses = fieldp->next;
10961 TYPE_FIELD (type, nfields) = fieldp->field;
10962 switch (fieldp->accessibility)
10964 case DW_ACCESS_private:
10965 if (cu->language != language_ada)
10966 SET_TYPE_FIELD_PRIVATE (type, nfields);
10969 case DW_ACCESS_protected:
10970 if (cu->language != language_ada)
10971 SET_TYPE_FIELD_PROTECTED (type, nfields);
10974 case DW_ACCESS_public:
10978 /* Unknown accessibility. Complain and treat it as public. */
10980 complaint (&symfile_complaints, _("unsupported accessibility %d"),
10981 fieldp->accessibility);
10985 if (nfields < fip->nbaseclasses)
10987 switch (fieldp->virtuality)
10989 case DW_VIRTUALITY_virtual:
10990 case DW_VIRTUALITY_pure_virtual:
10991 if (cu->language == language_ada)
10992 error (_("unexpected virtuality in component of Ada type"));
10993 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11000 /* Return true if this member function is a constructor, false
11004 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11006 const char *fieldname;
11007 const char *typename;
11010 if (die->parent == NULL)
11013 if (die->parent->tag != DW_TAG_structure_type
11014 && die->parent->tag != DW_TAG_union_type
11015 && die->parent->tag != DW_TAG_class_type)
11018 fieldname = dwarf2_name (die, cu);
11019 typename = dwarf2_name (die->parent, cu);
11020 if (fieldname == NULL || typename == NULL)
11023 len = strlen (fieldname);
11024 return (strncmp (fieldname, typename, len) == 0
11025 && (typename[len] == '\0' || typename[len] == '<'));
11028 /* Add a member function to the proper fieldlist. */
11031 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11032 struct type *type, struct dwarf2_cu *cu)
11034 struct objfile *objfile = cu->objfile;
11035 struct attribute *attr;
11036 struct fnfieldlist *flp;
11038 struct fn_field *fnp;
11039 const char *fieldname;
11040 struct nextfnfield *new_fnfield;
11041 struct type *this_type;
11042 enum dwarf_access_attribute accessibility;
11044 if (cu->language == language_ada)
11045 error (_("unexpected member function in Ada type"));
11047 /* Get name of member function. */
11048 fieldname = dwarf2_name (die, cu);
11049 if (fieldname == NULL)
11052 /* Look up member function name in fieldlist. */
11053 for (i = 0; i < fip->nfnfields; i++)
11055 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11059 /* Create new list element if necessary. */
11060 if (i < fip->nfnfields)
11061 flp = &fip->fnfieldlists[i];
11064 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11066 fip->fnfieldlists = (struct fnfieldlist *)
11067 xrealloc (fip->fnfieldlists,
11068 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11069 * sizeof (struct fnfieldlist));
11070 if (fip->nfnfields == 0)
11071 make_cleanup (free_current_contents, &fip->fnfieldlists);
11073 flp = &fip->fnfieldlists[fip->nfnfields];
11074 flp->name = fieldname;
11077 i = fip->nfnfields++;
11080 /* Create a new member function field and chain it to the field list
11082 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11083 make_cleanup (xfree, new_fnfield);
11084 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11085 new_fnfield->next = flp->head;
11086 flp->head = new_fnfield;
11089 /* Fill in the member function field info. */
11090 fnp = &new_fnfield->fnfield;
11092 /* Delay processing of the physname until later. */
11093 if (cu->language == language_cplus || cu->language == language_java)
11095 add_to_method_list (type, i, flp->length - 1, fieldname,
11100 const char *physname = dwarf2_physname (fieldname, die, cu);
11101 fnp->physname = physname ? physname : "";
11104 fnp->type = alloc_type (objfile);
11105 this_type = read_type_die (die, cu);
11106 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11108 int nparams = TYPE_NFIELDS (this_type);
11110 /* TYPE is the domain of this method, and THIS_TYPE is the type
11111 of the method itself (TYPE_CODE_METHOD). */
11112 smash_to_method_type (fnp->type, type,
11113 TYPE_TARGET_TYPE (this_type),
11114 TYPE_FIELDS (this_type),
11115 TYPE_NFIELDS (this_type),
11116 TYPE_VARARGS (this_type));
11118 /* Handle static member functions.
11119 Dwarf2 has no clean way to discern C++ static and non-static
11120 member functions. G++ helps GDB by marking the first
11121 parameter for non-static member functions (which is the this
11122 pointer) as artificial. We obtain this information from
11123 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11124 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11125 fnp->voffset = VOFFSET_STATIC;
11128 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11129 dwarf2_full_name (fieldname, die, cu));
11131 /* Get fcontext from DW_AT_containing_type if present. */
11132 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11133 fnp->fcontext = die_containing_type (die, cu);
11135 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11136 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11138 /* Get accessibility. */
11139 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11141 accessibility = DW_UNSND (attr);
11143 accessibility = dwarf2_default_access_attribute (die, cu);
11144 switch (accessibility)
11146 case DW_ACCESS_private:
11147 fnp->is_private = 1;
11149 case DW_ACCESS_protected:
11150 fnp->is_protected = 1;
11154 /* Check for artificial methods. */
11155 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11156 if (attr && DW_UNSND (attr) != 0)
11157 fnp->is_artificial = 1;
11159 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11161 /* Get index in virtual function table if it is a virtual member
11162 function. For older versions of GCC, this is an offset in the
11163 appropriate virtual table, as specified by DW_AT_containing_type.
11164 For everyone else, it is an expression to be evaluated relative
11165 to the object address. */
11167 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11170 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11172 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11174 /* Old-style GCC. */
11175 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11177 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11178 || (DW_BLOCK (attr)->size > 1
11179 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11180 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11182 struct dwarf_block blk;
11185 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11187 blk.size = DW_BLOCK (attr)->size - offset;
11188 blk.data = DW_BLOCK (attr)->data + offset;
11189 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11190 if ((fnp->voffset % cu->header.addr_size) != 0)
11191 dwarf2_complex_location_expr_complaint ();
11193 fnp->voffset /= cu->header.addr_size;
11197 dwarf2_complex_location_expr_complaint ();
11199 if (!fnp->fcontext)
11200 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11202 else if (attr_form_is_section_offset (attr))
11204 dwarf2_complex_location_expr_complaint ();
11208 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11214 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11215 if (attr && DW_UNSND (attr))
11217 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11218 complaint (&symfile_complaints,
11219 _("Member function \"%s\" (offset %d) is virtual "
11220 "but the vtable offset is not specified"),
11221 fieldname, die->offset.sect_off);
11222 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11223 TYPE_CPLUS_DYNAMIC (type) = 1;
11228 /* Create the vector of member function fields, and attach it to the type. */
11231 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11232 struct dwarf2_cu *cu)
11234 struct fnfieldlist *flp;
11237 if (cu->language == language_ada)
11238 error (_("unexpected member functions in Ada type"));
11240 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11241 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11242 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11244 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11246 struct nextfnfield *nfp = flp->head;
11247 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11250 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11251 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11252 fn_flp->fn_fields = (struct fn_field *)
11253 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11254 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11255 fn_flp->fn_fields[k] = nfp->fnfield;
11258 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11261 /* Returns non-zero if NAME is the name of a vtable member in CU's
11262 language, zero otherwise. */
11264 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11266 static const char vptr[] = "_vptr";
11267 static const char vtable[] = "vtable";
11269 /* Look for the C++ and Java forms of the vtable. */
11270 if ((cu->language == language_java
11271 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11272 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11273 && is_cplus_marker (name[sizeof (vptr) - 1])))
11279 /* GCC outputs unnamed structures that are really pointers to member
11280 functions, with the ABI-specified layout. If TYPE describes
11281 such a structure, smash it into a member function type.
11283 GCC shouldn't do this; it should just output pointer to member DIEs.
11284 This is GCC PR debug/28767. */
11287 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11289 struct type *pfn_type, *domain_type, *new_type;
11291 /* Check for a structure with no name and two children. */
11292 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11295 /* Check for __pfn and __delta members. */
11296 if (TYPE_FIELD_NAME (type, 0) == NULL
11297 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11298 || TYPE_FIELD_NAME (type, 1) == NULL
11299 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11302 /* Find the type of the method. */
11303 pfn_type = TYPE_FIELD_TYPE (type, 0);
11304 if (pfn_type == NULL
11305 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11306 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11309 /* Look for the "this" argument. */
11310 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11311 if (TYPE_NFIELDS (pfn_type) == 0
11312 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11313 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11316 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11317 new_type = alloc_type (objfile);
11318 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11319 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11320 TYPE_VARARGS (pfn_type));
11321 smash_to_methodptr_type (type, new_type);
11324 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11328 producer_is_icc (struct dwarf2_cu *cu)
11330 if (!cu->checked_producer)
11331 check_producer (cu);
11333 return cu->producer_is_icc;
11336 /* Called when we find the DIE that starts a structure or union scope
11337 (definition) to create a type for the structure or union. Fill in
11338 the type's name and general properties; the members will not be
11339 processed until process_structure_scope.
11341 NOTE: we need to call these functions regardless of whether or not the
11342 DIE has a DW_AT_name attribute, since it might be an anonymous
11343 structure or union. This gets the type entered into our set of
11344 user defined types.
11346 However, if the structure is incomplete (an opaque struct/union)
11347 then suppress creating a symbol table entry for it since gdb only
11348 wants to find the one with the complete definition. Note that if
11349 it is complete, we just call new_symbol, which does it's own
11350 checking about whether the struct/union is anonymous or not (and
11351 suppresses creating a symbol table entry itself). */
11353 static struct type *
11354 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11356 struct objfile *objfile = cu->objfile;
11358 struct attribute *attr;
11361 /* If the definition of this type lives in .debug_types, read that type.
11362 Don't follow DW_AT_specification though, that will take us back up
11363 the chain and we want to go down. */
11364 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11367 struct dwarf2_cu *type_cu = cu;
11368 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu);
11370 /* We could just recurse on read_structure_type, but we need to call
11371 get_die_type to ensure only one type for this DIE is created.
11372 This is important, for example, because for c++ classes we need
11373 TYPE_NAME set which is only done by new_symbol. Blech. */
11374 type = read_type_die (type_die, type_cu);
11376 /* TYPE_CU may not be the same as CU.
11377 Ensure TYPE is recorded with CU in die_type_hash. */
11378 return set_die_type (die, type, cu);
11381 type = alloc_type (objfile);
11382 INIT_CPLUS_SPECIFIC (type);
11384 name = dwarf2_name (die, cu);
11387 if (cu->language == language_cplus
11388 || cu->language == language_java)
11390 const char *full_name = dwarf2_full_name (name, die, cu);
11392 /* dwarf2_full_name might have already finished building the DIE's
11393 type. If so, there is no need to continue. */
11394 if (get_die_type (die, cu) != NULL)
11395 return get_die_type (die, cu);
11397 TYPE_TAG_NAME (type) = full_name;
11398 if (die->tag == DW_TAG_structure_type
11399 || die->tag == DW_TAG_class_type)
11400 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11404 /* The name is already allocated along with this objfile, so
11405 we don't need to duplicate it for the type. */
11406 TYPE_TAG_NAME (type) = name;
11407 if (die->tag == DW_TAG_class_type)
11408 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11412 if (die->tag == DW_TAG_structure_type)
11414 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11416 else if (die->tag == DW_TAG_union_type)
11418 TYPE_CODE (type) = TYPE_CODE_UNION;
11422 TYPE_CODE (type) = TYPE_CODE_CLASS;
11425 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11426 TYPE_DECLARED_CLASS (type) = 1;
11428 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11431 TYPE_LENGTH (type) = DW_UNSND (attr);
11435 TYPE_LENGTH (type) = 0;
11438 if (producer_is_icc (cu))
11440 /* ICC does not output the required DW_AT_declaration
11441 on incomplete types, but gives them a size of zero. */
11444 TYPE_STUB_SUPPORTED (type) = 1;
11446 if (die_is_declaration (die, cu))
11447 TYPE_STUB (type) = 1;
11448 else if (attr == NULL && die->child == NULL
11449 && producer_is_realview (cu->producer))
11450 /* RealView does not output the required DW_AT_declaration
11451 on incomplete types. */
11452 TYPE_STUB (type) = 1;
11454 /* We need to add the type field to the die immediately so we don't
11455 infinitely recurse when dealing with pointers to the structure
11456 type within the structure itself. */
11457 set_die_type (die, type, cu);
11459 /* set_die_type should be already done. */
11460 set_descriptive_type (type, die, cu);
11465 /* Finish creating a structure or union type, including filling in
11466 its members and creating a symbol for it. */
11469 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11471 struct objfile *objfile = cu->objfile;
11472 struct die_info *child_die = die->child;
11475 type = get_die_type (die, cu);
11477 type = read_structure_type (die, cu);
11479 if (die->child != NULL && ! die_is_declaration (die, cu))
11481 struct field_info fi;
11482 struct die_info *child_die;
11483 VEC (symbolp) *template_args = NULL;
11484 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11486 memset (&fi, 0, sizeof (struct field_info));
11488 child_die = die->child;
11490 while (child_die && child_die->tag)
11492 if (child_die->tag == DW_TAG_member
11493 || child_die->tag == DW_TAG_variable)
11495 /* NOTE: carlton/2002-11-05: A C++ static data member
11496 should be a DW_TAG_member that is a declaration, but
11497 all versions of G++ as of this writing (so through at
11498 least 3.2.1) incorrectly generate DW_TAG_variable
11499 tags for them instead. */
11500 dwarf2_add_field (&fi, child_die, cu);
11502 else if (child_die->tag == DW_TAG_subprogram)
11504 /* C++ member function. */
11505 dwarf2_add_member_fn (&fi, child_die, type, cu);
11507 else if (child_die->tag == DW_TAG_inheritance)
11509 /* C++ base class field. */
11510 dwarf2_add_field (&fi, child_die, cu);
11512 else if (child_die->tag == DW_TAG_typedef)
11513 dwarf2_add_typedef (&fi, child_die, cu);
11514 else if (child_die->tag == DW_TAG_template_type_param
11515 || child_die->tag == DW_TAG_template_value_param)
11517 struct symbol *arg = new_symbol (child_die, NULL, cu);
11520 VEC_safe_push (symbolp, template_args, arg);
11523 child_die = sibling_die (child_die);
11526 /* Attach template arguments to type. */
11527 if (! VEC_empty (symbolp, template_args))
11529 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11530 TYPE_N_TEMPLATE_ARGUMENTS (type)
11531 = VEC_length (symbolp, template_args);
11532 TYPE_TEMPLATE_ARGUMENTS (type)
11533 = obstack_alloc (&objfile->objfile_obstack,
11534 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11535 * sizeof (struct symbol *)));
11536 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11537 VEC_address (symbolp, template_args),
11538 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11539 * sizeof (struct symbol *)));
11540 VEC_free (symbolp, template_args);
11543 /* Attach fields and member functions to the type. */
11545 dwarf2_attach_fields_to_type (&fi, type, cu);
11548 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11550 /* Get the type which refers to the base class (possibly this
11551 class itself) which contains the vtable pointer for the current
11552 class from the DW_AT_containing_type attribute. This use of
11553 DW_AT_containing_type is a GNU extension. */
11555 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11557 struct type *t = die_containing_type (die, cu);
11559 TYPE_VPTR_BASETYPE (type) = t;
11564 /* Our own class provides vtbl ptr. */
11565 for (i = TYPE_NFIELDS (t) - 1;
11566 i >= TYPE_N_BASECLASSES (t);
11569 const char *fieldname = TYPE_FIELD_NAME (t, i);
11571 if (is_vtable_name (fieldname, cu))
11573 TYPE_VPTR_FIELDNO (type) = i;
11578 /* Complain if virtual function table field not found. */
11579 if (i < TYPE_N_BASECLASSES (t))
11580 complaint (&symfile_complaints,
11581 _("virtual function table pointer "
11582 "not found when defining class '%s'"),
11583 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
11588 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
11591 else if (cu->producer
11592 && strncmp (cu->producer,
11593 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
11595 /* The IBM XLC compiler does not provide direct indication
11596 of the containing type, but the vtable pointer is
11597 always named __vfp. */
11601 for (i = TYPE_NFIELDS (type) - 1;
11602 i >= TYPE_N_BASECLASSES (type);
11605 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
11607 TYPE_VPTR_FIELDNO (type) = i;
11608 TYPE_VPTR_BASETYPE (type) = type;
11615 /* Copy fi.typedef_field_list linked list elements content into the
11616 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
11617 if (fi.typedef_field_list)
11619 int i = fi.typedef_field_list_count;
11621 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11622 TYPE_TYPEDEF_FIELD_ARRAY (type)
11623 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
11624 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
11626 /* Reverse the list order to keep the debug info elements order. */
11629 struct typedef_field *dest, *src;
11631 dest = &TYPE_TYPEDEF_FIELD (type, i);
11632 src = &fi.typedef_field_list->field;
11633 fi.typedef_field_list = fi.typedef_field_list->next;
11638 do_cleanups (back_to);
11640 if (HAVE_CPLUS_STRUCT (type))
11641 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
11644 quirk_gcc_member_function_pointer (type, objfile);
11646 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
11647 snapshots) has been known to create a die giving a declaration
11648 for a class that has, as a child, a die giving a definition for a
11649 nested class. So we have to process our children even if the
11650 current die is a declaration. Normally, of course, a declaration
11651 won't have any children at all. */
11653 while (child_die != NULL && child_die->tag)
11655 if (child_die->tag == DW_TAG_member
11656 || child_die->tag == DW_TAG_variable
11657 || child_die->tag == DW_TAG_inheritance
11658 || child_die->tag == DW_TAG_template_value_param
11659 || child_die->tag == DW_TAG_template_type_param)
11664 process_die (child_die, cu);
11666 child_die = sibling_die (child_die);
11669 /* Do not consider external references. According to the DWARF standard,
11670 these DIEs are identified by the fact that they have no byte_size
11671 attribute, and a declaration attribute. */
11672 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
11673 || !die_is_declaration (die, cu))
11674 new_symbol (die, type, cu);
11677 /* Given a DW_AT_enumeration_type die, set its type. We do not
11678 complete the type's fields yet, or create any symbols. */
11680 static struct type *
11681 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
11683 struct objfile *objfile = cu->objfile;
11685 struct attribute *attr;
11688 /* If the definition of this type lives in .debug_types, read that type.
11689 Don't follow DW_AT_specification though, that will take us back up
11690 the chain and we want to go down. */
11691 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11694 struct dwarf2_cu *type_cu = cu;
11695 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu);
11697 type = read_type_die (type_die, type_cu);
11699 /* TYPE_CU may not be the same as CU.
11700 Ensure TYPE is recorded with CU in die_type_hash. */
11701 return set_die_type (die, type, cu);
11704 type = alloc_type (objfile);
11706 TYPE_CODE (type) = TYPE_CODE_ENUM;
11707 name = dwarf2_full_name (NULL, die, cu);
11709 TYPE_TAG_NAME (type) = name;
11711 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11714 TYPE_LENGTH (type) = DW_UNSND (attr);
11718 TYPE_LENGTH (type) = 0;
11721 /* The enumeration DIE can be incomplete. In Ada, any type can be
11722 declared as private in the package spec, and then defined only
11723 inside the package body. Such types are known as Taft Amendment
11724 Types. When another package uses such a type, an incomplete DIE
11725 may be generated by the compiler. */
11726 if (die_is_declaration (die, cu))
11727 TYPE_STUB (type) = 1;
11729 return set_die_type (die, type, cu);
11732 /* Given a pointer to a die which begins an enumeration, process all
11733 the dies that define the members of the enumeration, and create the
11734 symbol for the enumeration type.
11736 NOTE: We reverse the order of the element list. */
11739 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
11741 struct type *this_type;
11743 this_type = get_die_type (die, cu);
11744 if (this_type == NULL)
11745 this_type = read_enumeration_type (die, cu);
11747 if (die->child != NULL)
11749 struct die_info *child_die;
11750 struct symbol *sym;
11751 struct field *fields = NULL;
11752 int num_fields = 0;
11753 int unsigned_enum = 1;
11758 child_die = die->child;
11759 while (child_die && child_die->tag)
11761 if (child_die->tag != DW_TAG_enumerator)
11763 process_die (child_die, cu);
11767 name = dwarf2_name (child_die, cu);
11770 sym = new_symbol (child_die, this_type, cu);
11771 if (SYMBOL_VALUE (sym) < 0)
11776 else if ((mask & SYMBOL_VALUE (sym)) != 0)
11779 mask |= SYMBOL_VALUE (sym);
11781 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
11783 fields = (struct field *)
11785 (num_fields + DW_FIELD_ALLOC_CHUNK)
11786 * sizeof (struct field));
11789 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
11790 FIELD_TYPE (fields[num_fields]) = NULL;
11791 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
11792 FIELD_BITSIZE (fields[num_fields]) = 0;
11798 child_die = sibling_die (child_die);
11803 TYPE_NFIELDS (this_type) = num_fields;
11804 TYPE_FIELDS (this_type) = (struct field *)
11805 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
11806 memcpy (TYPE_FIELDS (this_type), fields,
11807 sizeof (struct field) * num_fields);
11811 TYPE_UNSIGNED (this_type) = 1;
11813 TYPE_FLAG_ENUM (this_type) = 1;
11816 /* If we are reading an enum from a .debug_types unit, and the enum
11817 is a declaration, and the enum is not the signatured type in the
11818 unit, then we do not want to add a symbol for it. Adding a
11819 symbol would in some cases obscure the true definition of the
11820 enum, giving users an incomplete type when the definition is
11821 actually available. Note that we do not want to do this for all
11822 enums which are just declarations, because C++0x allows forward
11823 enum declarations. */
11824 if (cu->per_cu->is_debug_types
11825 && die_is_declaration (die, cu))
11827 struct signatured_type *sig_type;
11829 sig_type = (struct signatured_type *) cu->per_cu;
11830 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
11831 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
11835 new_symbol (die, this_type, cu);
11838 /* Extract all information from a DW_TAG_array_type DIE and put it in
11839 the DIE's type field. For now, this only handles one dimensional
11842 static struct type *
11843 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
11845 struct objfile *objfile = cu->objfile;
11846 struct die_info *child_die;
11848 struct type *element_type, *range_type, *index_type;
11849 struct type **range_types = NULL;
11850 struct attribute *attr;
11852 struct cleanup *back_to;
11855 element_type = die_type (die, cu);
11857 /* The die_type call above may have already set the type for this DIE. */
11858 type = get_die_type (die, cu);
11862 /* Irix 6.2 native cc creates array types without children for
11863 arrays with unspecified length. */
11864 if (die->child == NULL)
11866 index_type = objfile_type (objfile)->builtin_int;
11867 range_type = create_range_type (NULL, index_type, 0, -1);
11868 type = create_array_type (NULL, element_type, range_type);
11869 return set_die_type (die, type, cu);
11872 back_to = make_cleanup (null_cleanup, NULL);
11873 child_die = die->child;
11874 while (child_die && child_die->tag)
11876 if (child_die->tag == DW_TAG_subrange_type)
11878 struct type *child_type = read_type_die (child_die, cu);
11880 if (child_type != NULL)
11882 /* The range type was succesfully read. Save it for the
11883 array type creation. */
11884 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
11886 range_types = (struct type **)
11887 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
11888 * sizeof (struct type *));
11890 make_cleanup (free_current_contents, &range_types);
11892 range_types[ndim++] = child_type;
11895 child_die = sibling_die (child_die);
11898 /* Dwarf2 dimensions are output from left to right, create the
11899 necessary array types in backwards order. */
11901 type = element_type;
11903 if (read_array_order (die, cu) == DW_ORD_col_major)
11908 type = create_array_type (NULL, type, range_types[i++]);
11913 type = create_array_type (NULL, type, range_types[ndim]);
11916 /* Understand Dwarf2 support for vector types (like they occur on
11917 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
11918 array type. This is not part of the Dwarf2/3 standard yet, but a
11919 custom vendor extension. The main difference between a regular
11920 array and the vector variant is that vectors are passed by value
11922 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
11924 make_vector_type (type);
11926 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
11927 implementation may choose to implement triple vectors using this
11929 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11932 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
11933 TYPE_LENGTH (type) = DW_UNSND (attr);
11935 complaint (&symfile_complaints,
11936 _("DW_AT_byte_size for array type smaller "
11937 "than the total size of elements"));
11940 name = dwarf2_name (die, cu);
11942 TYPE_NAME (type) = name;
11944 /* Install the type in the die. */
11945 set_die_type (die, type, cu);
11947 /* set_die_type should be already done. */
11948 set_descriptive_type (type, die, cu);
11950 do_cleanups (back_to);
11955 static enum dwarf_array_dim_ordering
11956 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
11958 struct attribute *attr;
11960 attr = dwarf2_attr (die, DW_AT_ordering, cu);
11962 if (attr) return DW_SND (attr);
11964 /* GNU F77 is a special case, as at 08/2004 array type info is the
11965 opposite order to the dwarf2 specification, but data is still
11966 laid out as per normal fortran.
11968 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
11969 version checking. */
11971 if (cu->language == language_fortran
11972 && cu->producer && strstr (cu->producer, "GNU F77"))
11974 return DW_ORD_row_major;
11977 switch (cu->language_defn->la_array_ordering)
11979 case array_column_major:
11980 return DW_ORD_col_major;
11981 case array_row_major:
11983 return DW_ORD_row_major;
11987 /* Extract all information from a DW_TAG_set_type DIE and put it in
11988 the DIE's type field. */
11990 static struct type *
11991 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
11993 struct type *domain_type, *set_type;
11994 struct attribute *attr;
11996 domain_type = die_type (die, cu);
11998 /* The die_type call above may have already set the type for this DIE. */
11999 set_type = get_die_type (die, cu);
12003 set_type = create_set_type (NULL, domain_type);
12005 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12007 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12009 return set_die_type (die, set_type, cu);
12012 /* A helper for read_common_block that creates a locexpr baton.
12013 SYM is the symbol which we are marking as computed.
12014 COMMON_DIE is the DIE for the common block.
12015 COMMON_LOC is the location expression attribute for the common
12017 MEMBER_LOC is the location expression attribute for the particular
12018 member of the common block that we are processing.
12019 CU is the CU from which the above come. */
12022 mark_common_block_symbol_computed (struct symbol *sym,
12023 struct die_info *common_die,
12024 struct attribute *common_loc,
12025 struct attribute *member_loc,
12026 struct dwarf2_cu *cu)
12028 struct objfile *objfile = dwarf2_per_objfile->objfile;
12029 struct dwarf2_locexpr_baton *baton;
12031 unsigned int cu_off;
12032 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12033 LONGEST offset = 0;
12035 gdb_assert (common_loc && member_loc);
12036 gdb_assert (attr_form_is_block (common_loc));
12037 gdb_assert (attr_form_is_block (member_loc)
12038 || attr_form_is_constant (member_loc));
12040 baton = obstack_alloc (&objfile->objfile_obstack,
12041 sizeof (struct dwarf2_locexpr_baton));
12042 baton->per_cu = cu->per_cu;
12043 gdb_assert (baton->per_cu);
12045 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12047 if (attr_form_is_constant (member_loc))
12049 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12050 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12053 baton->size += DW_BLOCK (member_loc)->size;
12055 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12058 *ptr++ = DW_OP_call4;
12059 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12060 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12063 if (attr_form_is_constant (member_loc))
12065 *ptr++ = DW_OP_addr;
12066 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12067 ptr += cu->header.addr_size;
12071 /* We have to copy the data here, because DW_OP_call4 will only
12072 use a DW_AT_location attribute. */
12073 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12074 ptr += DW_BLOCK (member_loc)->size;
12077 *ptr++ = DW_OP_plus;
12078 gdb_assert (ptr - baton->data == baton->size);
12080 SYMBOL_LOCATION_BATON (sym) = baton;
12081 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12084 /* Create appropriate locally-scoped variables for all the
12085 DW_TAG_common_block entries. Also create a struct common_block
12086 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12087 is used to sepate the common blocks name namespace from regular
12091 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12093 struct attribute *attr;
12095 attr = dwarf2_attr (die, DW_AT_location, cu);
12098 /* Support the .debug_loc offsets. */
12099 if (attr_form_is_block (attr))
12103 else if (attr_form_is_section_offset (attr))
12105 dwarf2_complex_location_expr_complaint ();
12110 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12111 "common block member");
12116 if (die->child != NULL)
12118 struct objfile *objfile = cu->objfile;
12119 struct die_info *child_die;
12120 size_t n_entries = 0, size;
12121 struct common_block *common_block;
12122 struct symbol *sym;
12124 for (child_die = die->child;
12125 child_die && child_die->tag;
12126 child_die = sibling_die (child_die))
12129 size = (sizeof (struct common_block)
12130 + (n_entries - 1) * sizeof (struct symbol *));
12131 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12132 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12133 common_block->n_entries = 0;
12135 for (child_die = die->child;
12136 child_die && child_die->tag;
12137 child_die = sibling_die (child_die))
12139 /* Create the symbol in the DW_TAG_common_block block in the current
12141 sym = new_symbol (child_die, NULL, cu);
12144 struct attribute *member_loc;
12146 common_block->contents[common_block->n_entries++] = sym;
12148 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12152 /* GDB has handled this for a long time, but it is
12153 not specified by DWARF. It seems to have been
12154 emitted by gfortran at least as recently as:
12155 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12156 complaint (&symfile_complaints,
12157 _("Variable in common block has "
12158 "DW_AT_data_member_location "
12159 "- DIE at 0x%x [in module %s]"),
12160 child_die->offset.sect_off, cu->objfile->name);
12162 if (attr_form_is_section_offset (member_loc))
12163 dwarf2_complex_location_expr_complaint ();
12164 else if (attr_form_is_constant (member_loc)
12165 || attr_form_is_block (member_loc))
12168 mark_common_block_symbol_computed (sym, die, attr,
12172 dwarf2_complex_location_expr_complaint ();
12177 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12178 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12182 /* Create a type for a C++ namespace. */
12184 static struct type *
12185 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12187 struct objfile *objfile = cu->objfile;
12188 const char *previous_prefix, *name;
12192 /* For extensions, reuse the type of the original namespace. */
12193 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12195 struct die_info *ext_die;
12196 struct dwarf2_cu *ext_cu = cu;
12198 ext_die = dwarf2_extension (die, &ext_cu);
12199 type = read_type_die (ext_die, ext_cu);
12201 /* EXT_CU may not be the same as CU.
12202 Ensure TYPE is recorded with CU in die_type_hash. */
12203 return set_die_type (die, type, cu);
12206 name = namespace_name (die, &is_anonymous, cu);
12208 /* Now build the name of the current namespace. */
12210 previous_prefix = determine_prefix (die, cu);
12211 if (previous_prefix[0] != '\0')
12212 name = typename_concat (&objfile->objfile_obstack,
12213 previous_prefix, name, 0, cu);
12215 /* Create the type. */
12216 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12218 TYPE_NAME (type) = name;
12219 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12221 return set_die_type (die, type, cu);
12224 /* Read a C++ namespace. */
12227 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12229 struct objfile *objfile = cu->objfile;
12232 /* Add a symbol associated to this if we haven't seen the namespace
12233 before. Also, add a using directive if it's an anonymous
12236 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12240 type = read_type_die (die, cu);
12241 new_symbol (die, type, cu);
12243 namespace_name (die, &is_anonymous, cu);
12246 const char *previous_prefix = determine_prefix (die, cu);
12248 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12249 NULL, NULL, 0, &objfile->objfile_obstack);
12253 if (die->child != NULL)
12255 struct die_info *child_die = die->child;
12257 while (child_die && child_die->tag)
12259 process_die (child_die, cu);
12260 child_die = sibling_die (child_die);
12265 /* Read a Fortran module as type. This DIE can be only a declaration used for
12266 imported module. Still we need that type as local Fortran "use ... only"
12267 declaration imports depend on the created type in determine_prefix. */
12269 static struct type *
12270 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12272 struct objfile *objfile = cu->objfile;
12273 const char *module_name;
12276 module_name = dwarf2_name (die, cu);
12278 complaint (&symfile_complaints,
12279 _("DW_TAG_module has no name, offset 0x%x"),
12280 die->offset.sect_off);
12281 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12283 /* determine_prefix uses TYPE_TAG_NAME. */
12284 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12286 return set_die_type (die, type, cu);
12289 /* Read a Fortran module. */
12292 read_module (struct die_info *die, struct dwarf2_cu *cu)
12294 struct die_info *child_die = die->child;
12296 while (child_die && child_die->tag)
12298 process_die (child_die, cu);
12299 child_die = sibling_die (child_die);
12303 /* Return the name of the namespace represented by DIE. Set
12304 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12307 static const char *
12308 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12310 struct die_info *current_die;
12311 const char *name = NULL;
12313 /* Loop through the extensions until we find a name. */
12315 for (current_die = die;
12316 current_die != NULL;
12317 current_die = dwarf2_extension (die, &cu))
12319 name = dwarf2_name (current_die, cu);
12324 /* Is it an anonymous namespace? */
12326 *is_anonymous = (name == NULL);
12328 name = CP_ANONYMOUS_NAMESPACE_STR;
12333 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12334 the user defined type vector. */
12336 static struct type *
12337 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12339 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12340 struct comp_unit_head *cu_header = &cu->header;
12342 struct attribute *attr_byte_size;
12343 struct attribute *attr_address_class;
12344 int byte_size, addr_class;
12345 struct type *target_type;
12347 target_type = die_type (die, cu);
12349 /* The die_type call above may have already set the type for this DIE. */
12350 type = get_die_type (die, cu);
12354 type = lookup_pointer_type (target_type);
12356 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12357 if (attr_byte_size)
12358 byte_size = DW_UNSND (attr_byte_size);
12360 byte_size = cu_header->addr_size;
12362 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12363 if (attr_address_class)
12364 addr_class = DW_UNSND (attr_address_class);
12366 addr_class = DW_ADDR_none;
12368 /* If the pointer size or address class is different than the
12369 default, create a type variant marked as such and set the
12370 length accordingly. */
12371 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12373 if (gdbarch_address_class_type_flags_p (gdbarch))
12377 type_flags = gdbarch_address_class_type_flags
12378 (gdbarch, byte_size, addr_class);
12379 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12381 type = make_type_with_address_space (type, type_flags);
12383 else if (TYPE_LENGTH (type) != byte_size)
12385 complaint (&symfile_complaints,
12386 _("invalid pointer size %d"), byte_size);
12390 /* Should we also complain about unhandled address classes? */
12394 TYPE_LENGTH (type) = byte_size;
12395 return set_die_type (die, type, cu);
12398 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12399 the user defined type vector. */
12401 static struct type *
12402 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12405 struct type *to_type;
12406 struct type *domain;
12408 to_type = die_type (die, cu);
12409 domain = die_containing_type (die, cu);
12411 /* The calls above may have already set the type for this DIE. */
12412 type = get_die_type (die, cu);
12416 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12417 type = lookup_methodptr_type (to_type);
12418 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12420 struct type *new_type = alloc_type (cu->objfile);
12422 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12423 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12424 TYPE_VARARGS (to_type));
12425 type = lookup_methodptr_type (new_type);
12428 type = lookup_memberptr_type (to_type, domain);
12430 return set_die_type (die, type, cu);
12433 /* Extract all information from a DW_TAG_reference_type DIE and add to
12434 the user defined type vector. */
12436 static struct type *
12437 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12439 struct comp_unit_head *cu_header = &cu->header;
12440 struct type *type, *target_type;
12441 struct attribute *attr;
12443 target_type = die_type (die, cu);
12445 /* The die_type call above may have already set the type for this DIE. */
12446 type = get_die_type (die, cu);
12450 type = lookup_reference_type (target_type);
12451 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12454 TYPE_LENGTH (type) = DW_UNSND (attr);
12458 TYPE_LENGTH (type) = cu_header->addr_size;
12460 return set_die_type (die, type, cu);
12463 static struct type *
12464 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12466 struct type *base_type, *cv_type;
12468 base_type = die_type (die, cu);
12470 /* The die_type call above may have already set the type for this DIE. */
12471 cv_type = get_die_type (die, cu);
12475 /* In case the const qualifier is applied to an array type, the element type
12476 is so qualified, not the array type (section 6.7.3 of C99). */
12477 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12479 struct type *el_type, *inner_array;
12481 base_type = copy_type (base_type);
12482 inner_array = base_type;
12484 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12486 TYPE_TARGET_TYPE (inner_array) =
12487 copy_type (TYPE_TARGET_TYPE (inner_array));
12488 inner_array = TYPE_TARGET_TYPE (inner_array);
12491 el_type = TYPE_TARGET_TYPE (inner_array);
12492 TYPE_TARGET_TYPE (inner_array) =
12493 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12495 return set_die_type (die, base_type, cu);
12498 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12499 return set_die_type (die, cv_type, cu);
12502 static struct type *
12503 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12505 struct type *base_type, *cv_type;
12507 base_type = die_type (die, cu);
12509 /* The die_type call above may have already set the type for this DIE. */
12510 cv_type = get_die_type (die, cu);
12514 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12515 return set_die_type (die, cv_type, cu);
12518 /* Handle DW_TAG_restrict_type. */
12520 static struct type *
12521 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12523 struct type *base_type, *cv_type;
12525 base_type = die_type (die, cu);
12527 /* The die_type call above may have already set the type for this DIE. */
12528 cv_type = get_die_type (die, cu);
12532 cv_type = make_restrict_type (base_type);
12533 return set_die_type (die, cv_type, cu);
12536 /* Extract all information from a DW_TAG_string_type DIE and add to
12537 the user defined type vector. It isn't really a user defined type,
12538 but it behaves like one, with other DIE's using an AT_user_def_type
12539 attribute to reference it. */
12541 static struct type *
12542 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12544 struct objfile *objfile = cu->objfile;
12545 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12546 struct type *type, *range_type, *index_type, *char_type;
12547 struct attribute *attr;
12548 unsigned int length;
12550 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12553 length = DW_UNSND (attr);
12557 /* Check for the DW_AT_byte_size attribute. */
12558 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12561 length = DW_UNSND (attr);
12569 index_type = objfile_type (objfile)->builtin_int;
12570 range_type = create_range_type (NULL, index_type, 1, length);
12571 char_type = language_string_char_type (cu->language_defn, gdbarch);
12572 type = create_string_type (NULL, char_type, range_type);
12574 return set_die_type (die, type, cu);
12577 /* Handle DIES due to C code like:
12581 int (*funcp)(int a, long l);
12585 ('funcp' generates a DW_TAG_subroutine_type DIE). */
12587 static struct type *
12588 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
12590 struct objfile *objfile = cu->objfile;
12591 struct type *type; /* Type that this function returns. */
12592 struct type *ftype; /* Function that returns above type. */
12593 struct attribute *attr;
12595 type = die_type (die, cu);
12597 /* The die_type call above may have already set the type for this DIE. */
12598 ftype = get_die_type (die, cu);
12602 ftype = lookup_function_type (type);
12604 /* All functions in C++, Pascal and Java have prototypes. */
12605 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
12606 if ((attr && (DW_UNSND (attr) != 0))
12607 || cu->language == language_cplus
12608 || cu->language == language_java
12609 || cu->language == language_pascal)
12610 TYPE_PROTOTYPED (ftype) = 1;
12611 else if (producer_is_realview (cu->producer))
12612 /* RealView does not emit DW_AT_prototyped. We can not
12613 distinguish prototyped and unprototyped functions; default to
12614 prototyped, since that is more common in modern code (and
12615 RealView warns about unprototyped functions). */
12616 TYPE_PROTOTYPED (ftype) = 1;
12618 /* Store the calling convention in the type if it's available in
12619 the subroutine die. Otherwise set the calling convention to
12620 the default value DW_CC_normal. */
12621 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
12623 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
12624 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
12625 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
12627 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
12629 /* We need to add the subroutine type to the die immediately so
12630 we don't infinitely recurse when dealing with parameters
12631 declared as the same subroutine type. */
12632 set_die_type (die, ftype, cu);
12634 if (die->child != NULL)
12636 struct type *void_type = objfile_type (objfile)->builtin_void;
12637 struct die_info *child_die;
12638 int nparams, iparams;
12640 /* Count the number of parameters.
12641 FIXME: GDB currently ignores vararg functions, but knows about
12642 vararg member functions. */
12644 child_die = die->child;
12645 while (child_die && child_die->tag)
12647 if (child_die->tag == DW_TAG_formal_parameter)
12649 else if (child_die->tag == DW_TAG_unspecified_parameters)
12650 TYPE_VARARGS (ftype) = 1;
12651 child_die = sibling_die (child_die);
12654 /* Allocate storage for parameters and fill them in. */
12655 TYPE_NFIELDS (ftype) = nparams;
12656 TYPE_FIELDS (ftype) = (struct field *)
12657 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
12659 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
12660 even if we error out during the parameters reading below. */
12661 for (iparams = 0; iparams < nparams; iparams++)
12662 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
12665 child_die = die->child;
12666 while (child_die && child_die->tag)
12668 if (child_die->tag == DW_TAG_formal_parameter)
12670 struct type *arg_type;
12672 /* DWARF version 2 has no clean way to discern C++
12673 static and non-static member functions. G++ helps
12674 GDB by marking the first parameter for non-static
12675 member functions (which is the this pointer) as
12676 artificial. We pass this information to
12677 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
12679 DWARF version 3 added DW_AT_object_pointer, which GCC
12680 4.5 does not yet generate. */
12681 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
12683 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
12686 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
12688 /* GCC/43521: In java, the formal parameter
12689 "this" is sometimes not marked with DW_AT_artificial. */
12690 if (cu->language == language_java)
12692 const char *name = dwarf2_name (child_die, cu);
12694 if (name && !strcmp (name, "this"))
12695 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
12698 arg_type = die_type (child_die, cu);
12700 /* RealView does not mark THIS as const, which the testsuite
12701 expects. GCC marks THIS as const in method definitions,
12702 but not in the class specifications (GCC PR 43053). */
12703 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
12704 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
12707 struct dwarf2_cu *arg_cu = cu;
12708 const char *name = dwarf2_name (child_die, cu);
12710 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
12713 /* If the compiler emits this, use it. */
12714 if (follow_die_ref (die, attr, &arg_cu) == child_die)
12717 else if (name && strcmp (name, "this") == 0)
12718 /* Function definitions will have the argument names. */
12720 else if (name == NULL && iparams == 0)
12721 /* Declarations may not have the names, so like
12722 elsewhere in GDB, assume an artificial first
12723 argument is "this". */
12727 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
12731 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
12734 child_die = sibling_die (child_die);
12741 static struct type *
12742 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
12744 struct objfile *objfile = cu->objfile;
12745 const char *name = NULL;
12746 struct type *this_type, *target_type;
12748 name = dwarf2_full_name (NULL, die, cu);
12749 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
12750 TYPE_FLAG_TARGET_STUB, NULL, objfile);
12751 TYPE_NAME (this_type) = name;
12752 set_die_type (die, this_type, cu);
12753 target_type = die_type (die, cu);
12754 if (target_type != this_type)
12755 TYPE_TARGET_TYPE (this_type) = target_type;
12758 /* Self-referential typedefs are, it seems, not allowed by the DWARF
12759 spec and cause infinite loops in GDB. */
12760 complaint (&symfile_complaints,
12761 _("Self-referential DW_TAG_typedef "
12762 "- DIE at 0x%x [in module %s]"),
12763 die->offset.sect_off, objfile->name);
12764 TYPE_TARGET_TYPE (this_type) = NULL;
12769 /* Find a representation of a given base type and install
12770 it in the TYPE field of the die. */
12772 static struct type *
12773 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
12775 struct objfile *objfile = cu->objfile;
12777 struct attribute *attr;
12778 int encoding = 0, size = 0;
12780 enum type_code code = TYPE_CODE_INT;
12781 int type_flags = 0;
12782 struct type *target_type = NULL;
12784 attr = dwarf2_attr (die, DW_AT_encoding, cu);
12787 encoding = DW_UNSND (attr);
12789 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12792 size = DW_UNSND (attr);
12794 name = dwarf2_name (die, cu);
12797 complaint (&symfile_complaints,
12798 _("DW_AT_name missing from DW_TAG_base_type"));
12803 case DW_ATE_address:
12804 /* Turn DW_ATE_address into a void * pointer. */
12805 code = TYPE_CODE_PTR;
12806 type_flags |= TYPE_FLAG_UNSIGNED;
12807 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
12809 case DW_ATE_boolean:
12810 code = TYPE_CODE_BOOL;
12811 type_flags |= TYPE_FLAG_UNSIGNED;
12813 case DW_ATE_complex_float:
12814 code = TYPE_CODE_COMPLEX;
12815 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
12817 case DW_ATE_decimal_float:
12818 code = TYPE_CODE_DECFLOAT;
12821 code = TYPE_CODE_FLT;
12823 case DW_ATE_signed:
12825 case DW_ATE_unsigned:
12826 type_flags |= TYPE_FLAG_UNSIGNED;
12827 if (cu->language == language_fortran
12829 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
12830 code = TYPE_CODE_CHAR;
12832 case DW_ATE_signed_char:
12833 if (cu->language == language_ada || cu->language == language_m2
12834 || cu->language == language_pascal
12835 || cu->language == language_fortran)
12836 code = TYPE_CODE_CHAR;
12838 case DW_ATE_unsigned_char:
12839 if (cu->language == language_ada || cu->language == language_m2
12840 || cu->language == language_pascal
12841 || cu->language == language_fortran)
12842 code = TYPE_CODE_CHAR;
12843 type_flags |= TYPE_FLAG_UNSIGNED;
12846 /* We just treat this as an integer and then recognize the
12847 type by name elsewhere. */
12851 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
12852 dwarf_type_encoding_name (encoding));
12856 type = init_type (code, size, type_flags, NULL, objfile);
12857 TYPE_NAME (type) = name;
12858 TYPE_TARGET_TYPE (type) = target_type;
12860 if (name && strcmp (name, "char") == 0)
12861 TYPE_NOSIGN (type) = 1;
12863 return set_die_type (die, type, cu);
12866 /* Read the given DW_AT_subrange DIE. */
12868 static struct type *
12869 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
12871 struct type *base_type, *orig_base_type;
12872 struct type *range_type;
12873 struct attribute *attr;
12875 int low_default_is_valid;
12877 LONGEST negative_mask;
12879 orig_base_type = die_type (die, cu);
12880 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
12881 whereas the real type might be. So, we use ORIG_BASE_TYPE when
12882 creating the range type, but we use the result of check_typedef
12883 when examining properties of the type. */
12884 base_type = check_typedef (orig_base_type);
12886 /* The die_type call above may have already set the type for this DIE. */
12887 range_type = get_die_type (die, cu);
12891 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
12892 omitting DW_AT_lower_bound. */
12893 switch (cu->language)
12896 case language_cplus:
12898 low_default_is_valid = 1;
12900 case language_fortran:
12902 low_default_is_valid = 1;
12905 case language_java:
12906 case language_objc:
12908 low_default_is_valid = (cu->header.version >= 4);
12912 case language_pascal:
12914 low_default_is_valid = (cu->header.version >= 4);
12918 low_default_is_valid = 0;
12922 /* FIXME: For variable sized arrays either of these could be
12923 a variable rather than a constant value. We'll allow it,
12924 but we don't know how to handle it. */
12925 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
12927 low = dwarf2_get_attr_constant_value (attr, low);
12928 else if (!low_default_is_valid)
12929 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
12930 "- DIE at 0x%x [in module %s]"),
12931 die->offset.sect_off, cu->objfile->name);
12933 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
12936 if (attr_form_is_block (attr) || is_ref_attr (attr))
12938 /* GCC encodes arrays with unspecified or dynamic length
12939 with a DW_FORM_block1 attribute or a reference attribute.
12940 FIXME: GDB does not yet know how to handle dynamic
12941 arrays properly, treat them as arrays with unspecified
12944 FIXME: jimb/2003-09-22: GDB does not really know
12945 how to handle arrays of unspecified length
12946 either; we just represent them as zero-length
12947 arrays. Choose an appropriate upper bound given
12948 the lower bound we've computed above. */
12952 high = dwarf2_get_attr_constant_value (attr, 1);
12956 attr = dwarf2_attr (die, DW_AT_count, cu);
12959 int count = dwarf2_get_attr_constant_value (attr, 1);
12960 high = low + count - 1;
12964 /* Unspecified array length. */
12969 /* Dwarf-2 specifications explicitly allows to create subrange types
12970 without specifying a base type.
12971 In that case, the base type must be set to the type of
12972 the lower bound, upper bound or count, in that order, if any of these
12973 three attributes references an object that has a type.
12974 If no base type is found, the Dwarf-2 specifications say that
12975 a signed integer type of size equal to the size of an address should
12977 For the following C code: `extern char gdb_int [];'
12978 GCC produces an empty range DIE.
12979 FIXME: muller/2010-05-28: Possible references to object for low bound,
12980 high bound or count are not yet handled by this code. */
12981 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
12983 struct objfile *objfile = cu->objfile;
12984 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12985 int addr_size = gdbarch_addr_bit (gdbarch) /8;
12986 struct type *int_type = objfile_type (objfile)->builtin_int;
12988 /* Test "int", "long int", and "long long int" objfile types,
12989 and select the first one having a size above or equal to the
12990 architecture address size. */
12991 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
12992 base_type = int_type;
12995 int_type = objfile_type (objfile)->builtin_long;
12996 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
12997 base_type = int_type;
13000 int_type = objfile_type (objfile)->builtin_long_long;
13001 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13002 base_type = int_type;
13008 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13009 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13010 low |= negative_mask;
13011 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13012 high |= negative_mask;
13014 range_type = create_range_type (NULL, orig_base_type, low, high);
13016 /* Mark arrays with dynamic length at least as an array of unspecified
13017 length. GDB could check the boundary but before it gets implemented at
13018 least allow accessing the array elements. */
13019 if (attr && attr_form_is_block (attr))
13020 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13022 /* Ada expects an empty array on no boundary attributes. */
13023 if (attr == NULL && cu->language != language_ada)
13024 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13026 name = dwarf2_name (die, cu);
13028 TYPE_NAME (range_type) = name;
13030 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13032 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13034 set_die_type (die, range_type, cu);
13036 /* set_die_type should be already done. */
13037 set_descriptive_type (range_type, die, cu);
13042 static struct type *
13043 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13047 /* For now, we only support the C meaning of an unspecified type: void. */
13049 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13050 TYPE_NAME (type) = dwarf2_name (die, cu);
13052 return set_die_type (die, type, cu);
13055 /* Read a single die and all its descendents. Set the die's sibling
13056 field to NULL; set other fields in the die correctly, and set all
13057 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13058 location of the info_ptr after reading all of those dies. PARENT
13059 is the parent of the die in question. */
13061 static struct die_info *
13062 read_die_and_children (const struct die_reader_specs *reader,
13063 const gdb_byte *info_ptr,
13064 const gdb_byte **new_info_ptr,
13065 struct die_info *parent)
13067 struct die_info *die;
13068 const gdb_byte *cur_ptr;
13071 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13074 *new_info_ptr = cur_ptr;
13077 store_in_ref_table (die, reader->cu);
13080 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13084 *new_info_ptr = cur_ptr;
13087 die->sibling = NULL;
13088 die->parent = parent;
13092 /* Read a die, all of its descendents, and all of its siblings; set
13093 all of the fields of all of the dies correctly. Arguments are as
13094 in read_die_and_children. */
13096 static struct die_info *
13097 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13098 const gdb_byte *info_ptr,
13099 const gdb_byte **new_info_ptr,
13100 struct die_info *parent)
13102 struct die_info *first_die, *last_sibling;
13103 const gdb_byte *cur_ptr;
13105 cur_ptr = info_ptr;
13106 first_die = last_sibling = NULL;
13110 struct die_info *die
13111 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13115 *new_info_ptr = cur_ptr;
13122 last_sibling->sibling = die;
13124 last_sibling = die;
13128 /* Read a die, all of its descendents, and all of its siblings; set
13129 all of the fields of all of the dies correctly. Arguments are as
13130 in read_die_and_children.
13131 This the main entry point for reading a DIE and all its children. */
13133 static struct die_info *
13134 read_die_and_siblings (const struct die_reader_specs *reader,
13135 const gdb_byte *info_ptr,
13136 const gdb_byte **new_info_ptr,
13137 struct die_info *parent)
13139 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13140 new_info_ptr, parent);
13142 if (dwarf2_die_debug)
13144 fprintf_unfiltered (gdb_stdlog,
13145 "Read die from %s@0x%x of %s:\n",
13146 bfd_section_name (reader->abfd,
13147 reader->die_section->asection),
13148 (unsigned) (info_ptr - reader->die_section->buffer),
13149 bfd_get_filename (reader->abfd));
13150 dump_die (die, dwarf2_die_debug);
13156 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13158 The caller is responsible for filling in the extra attributes
13159 and updating (*DIEP)->num_attrs.
13160 Set DIEP to point to a newly allocated die with its information,
13161 except for its child, sibling, and parent fields.
13162 Set HAS_CHILDREN to tell whether the die has children or not. */
13164 static const gdb_byte *
13165 read_full_die_1 (const struct die_reader_specs *reader,
13166 struct die_info **diep, const gdb_byte *info_ptr,
13167 int *has_children, int num_extra_attrs)
13169 unsigned int abbrev_number, bytes_read, i;
13170 sect_offset offset;
13171 struct abbrev_info *abbrev;
13172 struct die_info *die;
13173 struct dwarf2_cu *cu = reader->cu;
13174 bfd *abfd = reader->abfd;
13176 offset.sect_off = info_ptr - reader->buffer;
13177 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13178 info_ptr += bytes_read;
13179 if (!abbrev_number)
13186 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13188 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13190 bfd_get_filename (abfd));
13192 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13193 die->offset = offset;
13194 die->tag = abbrev->tag;
13195 die->abbrev = abbrev_number;
13197 /* Make the result usable.
13198 The caller needs to update num_attrs after adding the extra
13200 die->num_attrs = abbrev->num_attrs;
13202 for (i = 0; i < abbrev->num_attrs; ++i)
13203 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13207 *has_children = abbrev->has_children;
13211 /* Read a die and all its attributes.
13212 Set DIEP to point to a newly allocated die with its information,
13213 except for its child, sibling, and parent fields.
13214 Set HAS_CHILDREN to tell whether the die has children or not. */
13216 static const gdb_byte *
13217 read_full_die (const struct die_reader_specs *reader,
13218 struct die_info **diep, const gdb_byte *info_ptr,
13221 const gdb_byte *result;
13223 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13225 if (dwarf2_die_debug)
13227 fprintf_unfiltered (gdb_stdlog,
13228 "Read die from %s@0x%x of %s:\n",
13229 bfd_section_name (reader->abfd,
13230 reader->die_section->asection),
13231 (unsigned) (info_ptr - reader->die_section->buffer),
13232 bfd_get_filename (reader->abfd));
13233 dump_die (*diep, dwarf2_die_debug);
13239 /* Abbreviation tables.
13241 In DWARF version 2, the description of the debugging information is
13242 stored in a separate .debug_abbrev section. Before we read any
13243 dies from a section we read in all abbreviations and install them
13244 in a hash table. */
13246 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13248 static struct abbrev_info *
13249 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13251 struct abbrev_info *abbrev;
13253 abbrev = (struct abbrev_info *)
13254 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13255 memset (abbrev, 0, sizeof (struct abbrev_info));
13259 /* Add an abbreviation to the table. */
13262 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13263 unsigned int abbrev_number,
13264 struct abbrev_info *abbrev)
13266 unsigned int hash_number;
13268 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13269 abbrev->next = abbrev_table->abbrevs[hash_number];
13270 abbrev_table->abbrevs[hash_number] = abbrev;
13273 /* Look up an abbrev in the table.
13274 Returns NULL if the abbrev is not found. */
13276 static struct abbrev_info *
13277 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13278 unsigned int abbrev_number)
13280 unsigned int hash_number;
13281 struct abbrev_info *abbrev;
13283 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13284 abbrev = abbrev_table->abbrevs[hash_number];
13288 if (abbrev->number == abbrev_number)
13290 abbrev = abbrev->next;
13295 /* Read in an abbrev table. */
13297 static struct abbrev_table *
13298 abbrev_table_read_table (struct dwarf2_section_info *section,
13299 sect_offset offset)
13301 struct objfile *objfile = dwarf2_per_objfile->objfile;
13302 bfd *abfd = section->asection->owner;
13303 struct abbrev_table *abbrev_table;
13304 const gdb_byte *abbrev_ptr;
13305 struct abbrev_info *cur_abbrev;
13306 unsigned int abbrev_number, bytes_read, abbrev_name;
13307 unsigned int abbrev_form;
13308 struct attr_abbrev *cur_attrs;
13309 unsigned int allocated_attrs;
13311 abbrev_table = XMALLOC (struct abbrev_table);
13312 abbrev_table->offset = offset;
13313 obstack_init (&abbrev_table->abbrev_obstack);
13314 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13316 * sizeof (struct abbrev_info *)));
13317 memset (abbrev_table->abbrevs, 0,
13318 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13320 dwarf2_read_section (objfile, section);
13321 abbrev_ptr = section->buffer + offset.sect_off;
13322 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13323 abbrev_ptr += bytes_read;
13325 allocated_attrs = ATTR_ALLOC_CHUNK;
13326 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13328 /* Loop until we reach an abbrev number of 0. */
13329 while (abbrev_number)
13331 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13333 /* read in abbrev header */
13334 cur_abbrev->number = abbrev_number;
13335 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13336 abbrev_ptr += bytes_read;
13337 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13340 /* now read in declarations */
13341 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13342 abbrev_ptr += bytes_read;
13343 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13344 abbrev_ptr += bytes_read;
13345 while (abbrev_name)
13347 if (cur_abbrev->num_attrs == allocated_attrs)
13349 allocated_attrs += ATTR_ALLOC_CHUNK;
13351 = xrealloc (cur_attrs, (allocated_attrs
13352 * sizeof (struct attr_abbrev)));
13355 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13356 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13357 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13358 abbrev_ptr += bytes_read;
13359 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13360 abbrev_ptr += bytes_read;
13363 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13364 (cur_abbrev->num_attrs
13365 * sizeof (struct attr_abbrev)));
13366 memcpy (cur_abbrev->attrs, cur_attrs,
13367 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13369 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13371 /* Get next abbreviation.
13372 Under Irix6 the abbreviations for a compilation unit are not
13373 always properly terminated with an abbrev number of 0.
13374 Exit loop if we encounter an abbreviation which we have
13375 already read (which means we are about to read the abbreviations
13376 for the next compile unit) or if the end of the abbreviation
13377 table is reached. */
13378 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13380 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13381 abbrev_ptr += bytes_read;
13382 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13387 return abbrev_table;
13390 /* Free the resources held by ABBREV_TABLE. */
13393 abbrev_table_free (struct abbrev_table *abbrev_table)
13395 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13396 xfree (abbrev_table);
13399 /* Same as abbrev_table_free but as a cleanup.
13400 We pass in a pointer to the pointer to the table so that we can
13401 set the pointer to NULL when we're done. It also simplifies
13402 build_type_unit_groups. */
13405 abbrev_table_free_cleanup (void *table_ptr)
13407 struct abbrev_table **abbrev_table_ptr = table_ptr;
13409 if (*abbrev_table_ptr != NULL)
13410 abbrev_table_free (*abbrev_table_ptr);
13411 *abbrev_table_ptr = NULL;
13414 /* Read the abbrev table for CU from ABBREV_SECTION. */
13417 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13418 struct dwarf2_section_info *abbrev_section)
13421 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13424 /* Release the memory used by the abbrev table for a compilation unit. */
13427 dwarf2_free_abbrev_table (void *ptr_to_cu)
13429 struct dwarf2_cu *cu = ptr_to_cu;
13431 abbrev_table_free (cu->abbrev_table);
13432 /* Set this to NULL so that we SEGV if we try to read it later,
13433 and also because free_comp_unit verifies this is NULL. */
13434 cu->abbrev_table = NULL;
13437 /* Returns nonzero if TAG represents a type that we might generate a partial
13441 is_type_tag_for_partial (int tag)
13446 /* Some types that would be reasonable to generate partial symbols for,
13447 that we don't at present. */
13448 case DW_TAG_array_type:
13449 case DW_TAG_file_type:
13450 case DW_TAG_ptr_to_member_type:
13451 case DW_TAG_set_type:
13452 case DW_TAG_string_type:
13453 case DW_TAG_subroutine_type:
13455 case DW_TAG_base_type:
13456 case DW_TAG_class_type:
13457 case DW_TAG_interface_type:
13458 case DW_TAG_enumeration_type:
13459 case DW_TAG_structure_type:
13460 case DW_TAG_subrange_type:
13461 case DW_TAG_typedef:
13462 case DW_TAG_union_type:
13469 /* Load all DIEs that are interesting for partial symbols into memory. */
13471 static struct partial_die_info *
13472 load_partial_dies (const struct die_reader_specs *reader,
13473 const gdb_byte *info_ptr, int building_psymtab)
13475 struct dwarf2_cu *cu = reader->cu;
13476 struct objfile *objfile = cu->objfile;
13477 struct partial_die_info *part_die;
13478 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13479 struct abbrev_info *abbrev;
13480 unsigned int bytes_read;
13481 unsigned int load_all = 0;
13482 int nesting_level = 1;
13487 gdb_assert (cu->per_cu != NULL);
13488 if (cu->per_cu->load_all_dies)
13492 = htab_create_alloc_ex (cu->header.length / 12,
13496 &cu->comp_unit_obstack,
13497 hashtab_obstack_allocate,
13498 dummy_obstack_deallocate);
13500 part_die = obstack_alloc (&cu->comp_unit_obstack,
13501 sizeof (struct partial_die_info));
13505 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13507 /* A NULL abbrev means the end of a series of children. */
13508 if (abbrev == NULL)
13510 if (--nesting_level == 0)
13512 /* PART_DIE was probably the last thing allocated on the
13513 comp_unit_obstack, so we could call obstack_free
13514 here. We don't do that because the waste is small,
13515 and will be cleaned up when we're done with this
13516 compilation unit. This way, we're also more robust
13517 against other users of the comp_unit_obstack. */
13520 info_ptr += bytes_read;
13521 last_die = parent_die;
13522 parent_die = parent_die->die_parent;
13526 /* Check for template arguments. We never save these; if
13527 they're seen, we just mark the parent, and go on our way. */
13528 if (parent_die != NULL
13529 && cu->language == language_cplus
13530 && (abbrev->tag == DW_TAG_template_type_param
13531 || abbrev->tag == DW_TAG_template_value_param))
13533 parent_die->has_template_arguments = 1;
13537 /* We don't need a partial DIE for the template argument. */
13538 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13543 /* We only recurse into c++ subprograms looking for template arguments.
13544 Skip their other children. */
13546 && cu->language == language_cplus
13547 && parent_die != NULL
13548 && parent_die->tag == DW_TAG_subprogram)
13550 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13554 /* Check whether this DIE is interesting enough to save. Normally
13555 we would not be interested in members here, but there may be
13556 later variables referencing them via DW_AT_specification (for
13557 static members). */
13559 && !is_type_tag_for_partial (abbrev->tag)
13560 && abbrev->tag != DW_TAG_constant
13561 && abbrev->tag != DW_TAG_enumerator
13562 && abbrev->tag != DW_TAG_subprogram
13563 && abbrev->tag != DW_TAG_lexical_block
13564 && abbrev->tag != DW_TAG_variable
13565 && abbrev->tag != DW_TAG_namespace
13566 && abbrev->tag != DW_TAG_module
13567 && abbrev->tag != DW_TAG_member
13568 && abbrev->tag != DW_TAG_imported_unit)
13570 /* Otherwise we skip to the next sibling, if any. */
13571 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13575 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
13578 /* This two-pass algorithm for processing partial symbols has a
13579 high cost in cache pressure. Thus, handle some simple cases
13580 here which cover the majority of C partial symbols. DIEs
13581 which neither have specification tags in them, nor could have
13582 specification tags elsewhere pointing at them, can simply be
13583 processed and discarded.
13585 This segment is also optional; scan_partial_symbols and
13586 add_partial_symbol will handle these DIEs if we chain
13587 them in normally. When compilers which do not emit large
13588 quantities of duplicate debug information are more common,
13589 this code can probably be removed. */
13591 /* Any complete simple types at the top level (pretty much all
13592 of them, for a language without namespaces), can be processed
13594 if (parent_die == NULL
13595 && part_die->has_specification == 0
13596 && part_die->is_declaration == 0
13597 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
13598 || part_die->tag == DW_TAG_base_type
13599 || part_die->tag == DW_TAG_subrange_type))
13601 if (building_psymtab && part_die->name != NULL)
13602 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13603 VAR_DOMAIN, LOC_TYPEDEF,
13604 &objfile->static_psymbols,
13605 0, (CORE_ADDR) 0, cu->language, objfile);
13606 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13610 /* The exception for DW_TAG_typedef with has_children above is
13611 a workaround of GCC PR debug/47510. In the case of this complaint
13612 type_name_no_tag_or_error will error on such types later.
13614 GDB skipped children of DW_TAG_typedef by the shortcut above and then
13615 it could not find the child DIEs referenced later, this is checked
13616 above. In correct DWARF DW_TAG_typedef should have no children. */
13618 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
13619 complaint (&symfile_complaints,
13620 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
13621 "- DIE at 0x%x [in module %s]"),
13622 part_die->offset.sect_off, objfile->name);
13624 /* If we're at the second level, and we're an enumerator, and
13625 our parent has no specification (meaning possibly lives in a
13626 namespace elsewhere), then we can add the partial symbol now
13627 instead of queueing it. */
13628 if (part_die->tag == DW_TAG_enumerator
13629 && parent_die != NULL
13630 && parent_die->die_parent == NULL
13631 && parent_die->tag == DW_TAG_enumeration_type
13632 && parent_die->has_specification == 0)
13634 if (part_die->name == NULL)
13635 complaint (&symfile_complaints,
13636 _("malformed enumerator DIE ignored"));
13637 else if (building_psymtab)
13638 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13639 VAR_DOMAIN, LOC_CONST,
13640 (cu->language == language_cplus
13641 || cu->language == language_java)
13642 ? &objfile->global_psymbols
13643 : &objfile->static_psymbols,
13644 0, (CORE_ADDR) 0, cu->language, objfile);
13646 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13650 /* We'll save this DIE so link it in. */
13651 part_die->die_parent = parent_die;
13652 part_die->die_sibling = NULL;
13653 part_die->die_child = NULL;
13655 if (last_die && last_die == parent_die)
13656 last_die->die_child = part_die;
13658 last_die->die_sibling = part_die;
13660 last_die = part_die;
13662 if (first_die == NULL)
13663 first_die = part_die;
13665 /* Maybe add the DIE to the hash table. Not all DIEs that we
13666 find interesting need to be in the hash table, because we
13667 also have the parent/sibling/child chains; only those that we
13668 might refer to by offset later during partial symbol reading.
13670 For now this means things that might have be the target of a
13671 DW_AT_specification, DW_AT_abstract_origin, or
13672 DW_AT_extension. DW_AT_extension will refer only to
13673 namespaces; DW_AT_abstract_origin refers to functions (and
13674 many things under the function DIE, but we do not recurse
13675 into function DIEs during partial symbol reading) and
13676 possibly variables as well; DW_AT_specification refers to
13677 declarations. Declarations ought to have the DW_AT_declaration
13678 flag. It happens that GCC forgets to put it in sometimes, but
13679 only for functions, not for types.
13681 Adding more things than necessary to the hash table is harmless
13682 except for the performance cost. Adding too few will result in
13683 wasted time in find_partial_die, when we reread the compilation
13684 unit with load_all_dies set. */
13687 || abbrev->tag == DW_TAG_constant
13688 || abbrev->tag == DW_TAG_subprogram
13689 || abbrev->tag == DW_TAG_variable
13690 || abbrev->tag == DW_TAG_namespace
13691 || part_die->is_declaration)
13695 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
13696 part_die->offset.sect_off, INSERT);
13700 part_die = obstack_alloc (&cu->comp_unit_obstack,
13701 sizeof (struct partial_die_info));
13703 /* For some DIEs we want to follow their children (if any). For C
13704 we have no reason to follow the children of structures; for other
13705 languages we have to, so that we can get at method physnames
13706 to infer fully qualified class names, for DW_AT_specification,
13707 and for C++ template arguments. For C++, we also look one level
13708 inside functions to find template arguments (if the name of the
13709 function does not already contain the template arguments).
13711 For Ada, we need to scan the children of subprograms and lexical
13712 blocks as well because Ada allows the definition of nested
13713 entities that could be interesting for the debugger, such as
13714 nested subprograms for instance. */
13715 if (last_die->has_children
13717 || last_die->tag == DW_TAG_namespace
13718 || last_die->tag == DW_TAG_module
13719 || last_die->tag == DW_TAG_enumeration_type
13720 || (cu->language == language_cplus
13721 && last_die->tag == DW_TAG_subprogram
13722 && (last_die->name == NULL
13723 || strchr (last_die->name, '<') == NULL))
13724 || (cu->language != language_c
13725 && (last_die->tag == DW_TAG_class_type
13726 || last_die->tag == DW_TAG_interface_type
13727 || last_die->tag == DW_TAG_structure_type
13728 || last_die->tag == DW_TAG_union_type))
13729 || (cu->language == language_ada
13730 && (last_die->tag == DW_TAG_subprogram
13731 || last_die->tag == DW_TAG_lexical_block))))
13734 parent_die = last_die;
13738 /* Otherwise we skip to the next sibling, if any. */
13739 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
13741 /* Back to the top, do it again. */
13745 /* Read a minimal amount of information into the minimal die structure. */
13747 static const gdb_byte *
13748 read_partial_die (const struct die_reader_specs *reader,
13749 struct partial_die_info *part_die,
13750 struct abbrev_info *abbrev, unsigned int abbrev_len,
13751 const gdb_byte *info_ptr)
13753 struct dwarf2_cu *cu = reader->cu;
13754 struct objfile *objfile = cu->objfile;
13755 const gdb_byte *buffer = reader->buffer;
13757 struct attribute attr;
13758 int has_low_pc_attr = 0;
13759 int has_high_pc_attr = 0;
13760 int high_pc_relative = 0;
13762 memset (part_die, 0, sizeof (struct partial_die_info));
13764 part_die->offset.sect_off = info_ptr - buffer;
13766 info_ptr += abbrev_len;
13768 if (abbrev == NULL)
13771 part_die->tag = abbrev->tag;
13772 part_die->has_children = abbrev->has_children;
13774 for (i = 0; i < abbrev->num_attrs; ++i)
13776 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
13778 /* Store the data if it is of an attribute we want to keep in a
13779 partial symbol table. */
13783 switch (part_die->tag)
13785 case DW_TAG_compile_unit:
13786 case DW_TAG_partial_unit:
13787 case DW_TAG_type_unit:
13788 /* Compilation units have a DW_AT_name that is a filename, not
13789 a source language identifier. */
13790 case DW_TAG_enumeration_type:
13791 case DW_TAG_enumerator:
13792 /* These tags always have simple identifiers already; no need
13793 to canonicalize them. */
13794 part_die->name = DW_STRING (&attr);
13798 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
13799 &objfile->objfile_obstack);
13803 case DW_AT_linkage_name:
13804 case DW_AT_MIPS_linkage_name:
13805 /* Note that both forms of linkage name might appear. We
13806 assume they will be the same, and we only store the last
13808 if (cu->language == language_ada)
13809 part_die->name = DW_STRING (&attr);
13810 part_die->linkage_name = DW_STRING (&attr);
13813 has_low_pc_attr = 1;
13814 part_die->lowpc = DW_ADDR (&attr);
13816 case DW_AT_high_pc:
13817 has_high_pc_attr = 1;
13818 if (attr.form == DW_FORM_addr
13819 || attr.form == DW_FORM_GNU_addr_index)
13820 part_die->highpc = DW_ADDR (&attr);
13823 high_pc_relative = 1;
13824 part_die->highpc = DW_UNSND (&attr);
13827 case DW_AT_location:
13828 /* Support the .debug_loc offsets. */
13829 if (attr_form_is_block (&attr))
13831 part_die->d.locdesc = DW_BLOCK (&attr);
13833 else if (attr_form_is_section_offset (&attr))
13835 dwarf2_complex_location_expr_complaint ();
13839 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13840 "partial symbol information");
13843 case DW_AT_external:
13844 part_die->is_external = DW_UNSND (&attr);
13846 case DW_AT_declaration:
13847 part_die->is_declaration = DW_UNSND (&attr);
13850 part_die->has_type = 1;
13852 case DW_AT_abstract_origin:
13853 case DW_AT_specification:
13854 case DW_AT_extension:
13855 part_die->has_specification = 1;
13856 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
13857 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13858 || cu->per_cu->is_dwz);
13860 case DW_AT_sibling:
13861 /* Ignore absolute siblings, they might point outside of
13862 the current compile unit. */
13863 if (attr.form == DW_FORM_ref_addr)
13864 complaint (&symfile_complaints,
13865 _("ignoring absolute DW_AT_sibling"));
13867 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
13869 case DW_AT_byte_size:
13870 part_die->has_byte_size = 1;
13872 case DW_AT_calling_convention:
13873 /* DWARF doesn't provide a way to identify a program's source-level
13874 entry point. DW_AT_calling_convention attributes are only meant
13875 to describe functions' calling conventions.
13877 However, because it's a necessary piece of information in
13878 Fortran, and because DW_CC_program is the only piece of debugging
13879 information whose definition refers to a 'main program' at all,
13880 several compilers have begun marking Fortran main programs with
13881 DW_CC_program --- even when those functions use the standard
13882 calling conventions.
13884 So until DWARF specifies a way to provide this information and
13885 compilers pick up the new representation, we'll support this
13887 if (DW_UNSND (&attr) == DW_CC_program
13888 && cu->language == language_fortran)
13890 set_main_name (part_die->name);
13892 /* As this DIE has a static linkage the name would be difficult
13893 to look up later. */
13894 language_of_main = language_fortran;
13898 if (DW_UNSND (&attr) == DW_INL_inlined
13899 || DW_UNSND (&attr) == DW_INL_declared_inlined)
13900 part_die->may_be_inlined = 1;
13904 if (part_die->tag == DW_TAG_imported_unit)
13906 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
13907 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13908 || cu->per_cu->is_dwz);
13917 if (high_pc_relative)
13918 part_die->highpc += part_die->lowpc;
13920 if (has_low_pc_attr && has_high_pc_attr)
13922 /* When using the GNU linker, .gnu.linkonce. sections are used to
13923 eliminate duplicate copies of functions and vtables and such.
13924 The linker will arbitrarily choose one and discard the others.
13925 The AT_*_pc values for such functions refer to local labels in
13926 these sections. If the section from that file was discarded, the
13927 labels are not in the output, so the relocs get a value of 0.
13928 If this is a discarded function, mark the pc bounds as invalid,
13929 so that GDB will ignore it. */
13930 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
13932 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13934 complaint (&symfile_complaints,
13935 _("DW_AT_low_pc %s is zero "
13936 "for DIE at 0x%x [in module %s]"),
13937 paddress (gdbarch, part_die->lowpc),
13938 part_die->offset.sect_off, objfile->name);
13940 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
13941 else if (part_die->lowpc >= part_die->highpc)
13943 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13945 complaint (&symfile_complaints,
13946 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
13947 "for DIE at 0x%x [in module %s]"),
13948 paddress (gdbarch, part_die->lowpc),
13949 paddress (gdbarch, part_die->highpc),
13950 part_die->offset.sect_off, objfile->name);
13953 part_die->has_pc_info = 1;
13959 /* Find a cached partial DIE at OFFSET in CU. */
13961 static struct partial_die_info *
13962 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
13964 struct partial_die_info *lookup_die = NULL;
13965 struct partial_die_info part_die;
13967 part_die.offset = offset;
13968 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
13974 /* Find a partial DIE at OFFSET, which may or may not be in CU,
13975 except in the case of .debug_types DIEs which do not reference
13976 outside their CU (they do however referencing other types via
13977 DW_FORM_ref_sig8). */
13979 static struct partial_die_info *
13980 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
13982 struct objfile *objfile = cu->objfile;
13983 struct dwarf2_per_cu_data *per_cu = NULL;
13984 struct partial_die_info *pd = NULL;
13986 if (offset_in_dwz == cu->per_cu->is_dwz
13987 && offset_in_cu_p (&cu->header, offset))
13989 pd = find_partial_die_in_comp_unit (offset, cu);
13992 /* We missed recording what we needed.
13993 Load all dies and try again. */
13994 per_cu = cu->per_cu;
13998 /* TUs don't reference other CUs/TUs (except via type signatures). */
13999 if (cu->per_cu->is_debug_types)
14001 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14002 " external reference to offset 0x%lx [in module %s].\n"),
14003 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14004 bfd_get_filename (objfile->obfd));
14006 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14009 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14010 load_partial_comp_unit (per_cu);
14012 per_cu->cu->last_used = 0;
14013 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14016 /* If we didn't find it, and not all dies have been loaded,
14017 load them all and try again. */
14019 if (pd == NULL && per_cu->load_all_dies == 0)
14021 per_cu->load_all_dies = 1;
14023 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14024 THIS_CU->cu may already be in use. So we can't just free it and
14025 replace its DIEs with the ones we read in. Instead, we leave those
14026 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14027 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14029 load_partial_comp_unit (per_cu);
14031 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14035 internal_error (__FILE__, __LINE__,
14036 _("could not find partial DIE 0x%x "
14037 "in cache [from module %s]\n"),
14038 offset.sect_off, bfd_get_filename (objfile->obfd));
14042 /* See if we can figure out if the class lives in a namespace. We do
14043 this by looking for a member function; its demangled name will
14044 contain namespace info, if there is any. */
14047 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14048 struct dwarf2_cu *cu)
14050 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14051 what template types look like, because the demangler
14052 frequently doesn't give the same name as the debug info. We
14053 could fix this by only using the demangled name to get the
14054 prefix (but see comment in read_structure_type). */
14056 struct partial_die_info *real_pdi;
14057 struct partial_die_info *child_pdi;
14059 /* If this DIE (this DIE's specification, if any) has a parent, then
14060 we should not do this. We'll prepend the parent's fully qualified
14061 name when we create the partial symbol. */
14063 real_pdi = struct_pdi;
14064 while (real_pdi->has_specification)
14065 real_pdi = find_partial_die (real_pdi->spec_offset,
14066 real_pdi->spec_is_dwz, cu);
14068 if (real_pdi->die_parent != NULL)
14071 for (child_pdi = struct_pdi->die_child;
14073 child_pdi = child_pdi->die_sibling)
14075 if (child_pdi->tag == DW_TAG_subprogram
14076 && child_pdi->linkage_name != NULL)
14078 char *actual_class_name
14079 = language_class_name_from_physname (cu->language_defn,
14080 child_pdi->linkage_name);
14081 if (actual_class_name != NULL)
14084 = obstack_copy0 (&cu->objfile->objfile_obstack,
14086 strlen (actual_class_name));
14087 xfree (actual_class_name);
14094 /* Adjust PART_DIE before generating a symbol for it. This function
14095 may set the is_external flag or change the DIE's name. */
14098 fixup_partial_die (struct partial_die_info *part_die,
14099 struct dwarf2_cu *cu)
14101 /* Once we've fixed up a die, there's no point in doing so again.
14102 This also avoids a memory leak if we were to call
14103 guess_partial_die_structure_name multiple times. */
14104 if (part_die->fixup_called)
14107 /* If we found a reference attribute and the DIE has no name, try
14108 to find a name in the referred to DIE. */
14110 if (part_die->name == NULL && part_die->has_specification)
14112 struct partial_die_info *spec_die;
14114 spec_die = find_partial_die (part_die->spec_offset,
14115 part_die->spec_is_dwz, cu);
14117 fixup_partial_die (spec_die, cu);
14119 if (spec_die->name)
14121 part_die->name = spec_die->name;
14123 /* Copy DW_AT_external attribute if it is set. */
14124 if (spec_die->is_external)
14125 part_die->is_external = spec_die->is_external;
14129 /* Set default names for some unnamed DIEs. */
14131 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14132 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14134 /* If there is no parent die to provide a namespace, and there are
14135 children, see if we can determine the namespace from their linkage
14137 if (cu->language == language_cplus
14138 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14139 && part_die->die_parent == NULL
14140 && part_die->has_children
14141 && (part_die->tag == DW_TAG_class_type
14142 || part_die->tag == DW_TAG_structure_type
14143 || part_die->tag == DW_TAG_union_type))
14144 guess_partial_die_structure_name (part_die, cu);
14146 /* GCC might emit a nameless struct or union that has a linkage
14147 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14148 if (part_die->name == NULL
14149 && (part_die->tag == DW_TAG_class_type
14150 || part_die->tag == DW_TAG_interface_type
14151 || part_die->tag == DW_TAG_structure_type
14152 || part_die->tag == DW_TAG_union_type)
14153 && part_die->linkage_name != NULL)
14157 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14162 /* Strip any leading namespaces/classes, keep only the base name.
14163 DW_AT_name for named DIEs does not contain the prefixes. */
14164 base = strrchr (demangled, ':');
14165 if (base && base > demangled && base[-1] == ':')
14170 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14171 base, strlen (base));
14176 part_die->fixup_called = 1;
14179 /* Read an attribute value described by an attribute form. */
14181 static const gdb_byte *
14182 read_attribute_value (const struct die_reader_specs *reader,
14183 struct attribute *attr, unsigned form,
14184 const gdb_byte *info_ptr)
14186 struct dwarf2_cu *cu = reader->cu;
14187 bfd *abfd = reader->abfd;
14188 struct comp_unit_head *cu_header = &cu->header;
14189 unsigned int bytes_read;
14190 struct dwarf_block *blk;
14195 case DW_FORM_ref_addr:
14196 if (cu->header.version == 2)
14197 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14199 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14200 &cu->header, &bytes_read);
14201 info_ptr += bytes_read;
14203 case DW_FORM_GNU_ref_alt:
14204 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14205 info_ptr += bytes_read;
14208 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14209 info_ptr += bytes_read;
14211 case DW_FORM_block2:
14212 blk = dwarf_alloc_block (cu);
14213 blk->size = read_2_bytes (abfd, info_ptr);
14215 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14216 info_ptr += blk->size;
14217 DW_BLOCK (attr) = blk;
14219 case DW_FORM_block4:
14220 blk = dwarf_alloc_block (cu);
14221 blk->size = read_4_bytes (abfd, info_ptr);
14223 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14224 info_ptr += blk->size;
14225 DW_BLOCK (attr) = blk;
14227 case DW_FORM_data2:
14228 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14231 case DW_FORM_data4:
14232 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14235 case DW_FORM_data8:
14236 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14239 case DW_FORM_sec_offset:
14240 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14241 info_ptr += bytes_read;
14243 case DW_FORM_string:
14244 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14245 DW_STRING_IS_CANONICAL (attr) = 0;
14246 info_ptr += bytes_read;
14249 if (!cu->per_cu->is_dwz)
14251 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14253 DW_STRING_IS_CANONICAL (attr) = 0;
14254 info_ptr += bytes_read;
14258 case DW_FORM_GNU_strp_alt:
14260 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14261 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14264 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14265 DW_STRING_IS_CANONICAL (attr) = 0;
14266 info_ptr += bytes_read;
14269 case DW_FORM_exprloc:
14270 case DW_FORM_block:
14271 blk = dwarf_alloc_block (cu);
14272 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14273 info_ptr += bytes_read;
14274 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14275 info_ptr += blk->size;
14276 DW_BLOCK (attr) = blk;
14278 case DW_FORM_block1:
14279 blk = dwarf_alloc_block (cu);
14280 blk->size = read_1_byte (abfd, info_ptr);
14282 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14283 info_ptr += blk->size;
14284 DW_BLOCK (attr) = blk;
14286 case DW_FORM_data1:
14287 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14291 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14294 case DW_FORM_flag_present:
14295 DW_UNSND (attr) = 1;
14297 case DW_FORM_sdata:
14298 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14299 info_ptr += bytes_read;
14301 case DW_FORM_udata:
14302 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14303 info_ptr += bytes_read;
14306 DW_UNSND (attr) = (cu->header.offset.sect_off
14307 + read_1_byte (abfd, info_ptr));
14311 DW_UNSND (attr) = (cu->header.offset.sect_off
14312 + read_2_bytes (abfd, info_ptr));
14316 DW_UNSND (attr) = (cu->header.offset.sect_off
14317 + read_4_bytes (abfd, info_ptr));
14321 DW_UNSND (attr) = (cu->header.offset.sect_off
14322 + read_8_bytes (abfd, info_ptr));
14325 case DW_FORM_ref_sig8:
14326 /* Convert the signature to something we can record in DW_UNSND
14328 NOTE: This is NULL if the type wasn't found. */
14329 DW_SIGNATURED_TYPE (attr) =
14330 lookup_signatured_type (read_8_bytes (abfd, info_ptr));
14333 case DW_FORM_ref_udata:
14334 DW_UNSND (attr) = (cu->header.offset.sect_off
14335 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14336 info_ptr += bytes_read;
14338 case DW_FORM_indirect:
14339 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14340 info_ptr += bytes_read;
14341 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14343 case DW_FORM_GNU_addr_index:
14344 if (reader->dwo_file == NULL)
14346 /* For now flag a hard error.
14347 Later we can turn this into a complaint. */
14348 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14349 dwarf_form_name (form),
14350 bfd_get_filename (abfd));
14352 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14353 info_ptr += bytes_read;
14355 case DW_FORM_GNU_str_index:
14356 if (reader->dwo_file == NULL)
14358 /* For now flag a hard error.
14359 Later we can turn this into a complaint if warranted. */
14360 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14361 dwarf_form_name (form),
14362 bfd_get_filename (abfd));
14365 ULONGEST str_index =
14366 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14368 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14369 DW_STRING_IS_CANONICAL (attr) = 0;
14370 info_ptr += bytes_read;
14374 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14375 dwarf_form_name (form),
14376 bfd_get_filename (abfd));
14380 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14381 attr->form = DW_FORM_GNU_ref_alt;
14383 /* We have seen instances where the compiler tried to emit a byte
14384 size attribute of -1 which ended up being encoded as an unsigned
14385 0xffffffff. Although 0xffffffff is technically a valid size value,
14386 an object of this size seems pretty unlikely so we can relatively
14387 safely treat these cases as if the size attribute was invalid and
14388 treat them as zero by default. */
14389 if (attr->name == DW_AT_byte_size
14390 && form == DW_FORM_data4
14391 && DW_UNSND (attr) >= 0xffffffff)
14394 (&symfile_complaints,
14395 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14396 hex_string (DW_UNSND (attr)));
14397 DW_UNSND (attr) = 0;
14403 /* Read an attribute described by an abbreviated attribute. */
14405 static const gdb_byte *
14406 read_attribute (const struct die_reader_specs *reader,
14407 struct attribute *attr, struct attr_abbrev *abbrev,
14408 const gdb_byte *info_ptr)
14410 attr->name = abbrev->name;
14411 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14414 /* Read dwarf information from a buffer. */
14416 static unsigned int
14417 read_1_byte (bfd *abfd, const gdb_byte *buf)
14419 return bfd_get_8 (abfd, buf);
14423 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14425 return bfd_get_signed_8 (abfd, buf);
14428 static unsigned int
14429 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14431 return bfd_get_16 (abfd, buf);
14435 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14437 return bfd_get_signed_16 (abfd, buf);
14440 static unsigned int
14441 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14443 return bfd_get_32 (abfd, buf);
14447 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14449 return bfd_get_signed_32 (abfd, buf);
14453 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14455 return bfd_get_64 (abfd, buf);
14459 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14460 unsigned int *bytes_read)
14462 struct comp_unit_head *cu_header = &cu->header;
14463 CORE_ADDR retval = 0;
14465 if (cu_header->signed_addr_p)
14467 switch (cu_header->addr_size)
14470 retval = bfd_get_signed_16 (abfd, buf);
14473 retval = bfd_get_signed_32 (abfd, buf);
14476 retval = bfd_get_signed_64 (abfd, buf);
14479 internal_error (__FILE__, __LINE__,
14480 _("read_address: bad switch, signed [in module %s]"),
14481 bfd_get_filename (abfd));
14486 switch (cu_header->addr_size)
14489 retval = bfd_get_16 (abfd, buf);
14492 retval = bfd_get_32 (abfd, buf);
14495 retval = bfd_get_64 (abfd, buf);
14498 internal_error (__FILE__, __LINE__,
14499 _("read_address: bad switch, "
14500 "unsigned [in module %s]"),
14501 bfd_get_filename (abfd));
14505 *bytes_read = cu_header->addr_size;
14509 /* Read the initial length from a section. The (draft) DWARF 3
14510 specification allows the initial length to take up either 4 bytes
14511 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14512 bytes describe the length and all offsets will be 8 bytes in length
14515 An older, non-standard 64-bit format is also handled by this
14516 function. The older format in question stores the initial length
14517 as an 8-byte quantity without an escape value. Lengths greater
14518 than 2^32 aren't very common which means that the initial 4 bytes
14519 is almost always zero. Since a length value of zero doesn't make
14520 sense for the 32-bit format, this initial zero can be considered to
14521 be an escape value which indicates the presence of the older 64-bit
14522 format. As written, the code can't detect (old format) lengths
14523 greater than 4GB. If it becomes necessary to handle lengths
14524 somewhat larger than 4GB, we could allow other small values (such
14525 as the non-sensical values of 1, 2, and 3) to also be used as
14526 escape values indicating the presence of the old format.
14528 The value returned via bytes_read should be used to increment the
14529 relevant pointer after calling read_initial_length().
14531 [ Note: read_initial_length() and read_offset() are based on the
14532 document entitled "DWARF Debugging Information Format", revision
14533 3, draft 8, dated November 19, 2001. This document was obtained
14536 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14538 This document is only a draft and is subject to change. (So beware.)
14540 Details regarding the older, non-standard 64-bit format were
14541 determined empirically by examining 64-bit ELF files produced by
14542 the SGI toolchain on an IRIX 6.5 machine.
14544 - Kevin, July 16, 2002
14548 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
14550 LONGEST length = bfd_get_32 (abfd, buf);
14552 if (length == 0xffffffff)
14554 length = bfd_get_64 (abfd, buf + 4);
14557 else if (length == 0)
14559 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
14560 length = bfd_get_64 (abfd, buf);
14571 /* Cover function for read_initial_length.
14572 Returns the length of the object at BUF, and stores the size of the
14573 initial length in *BYTES_READ and stores the size that offsets will be in
14575 If the initial length size is not equivalent to that specified in
14576 CU_HEADER then issue a complaint.
14577 This is useful when reading non-comp-unit headers. */
14580 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
14581 const struct comp_unit_head *cu_header,
14582 unsigned int *bytes_read,
14583 unsigned int *offset_size)
14585 LONGEST length = read_initial_length (abfd, buf, bytes_read);
14587 gdb_assert (cu_header->initial_length_size == 4
14588 || cu_header->initial_length_size == 8
14589 || cu_header->initial_length_size == 12);
14591 if (cu_header->initial_length_size != *bytes_read)
14592 complaint (&symfile_complaints,
14593 _("intermixed 32-bit and 64-bit DWARF sections"));
14595 *offset_size = (*bytes_read == 4) ? 4 : 8;
14599 /* Read an offset from the data stream. The size of the offset is
14600 given by cu_header->offset_size. */
14603 read_offset (bfd *abfd, const gdb_byte *buf,
14604 const struct comp_unit_head *cu_header,
14605 unsigned int *bytes_read)
14607 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
14609 *bytes_read = cu_header->offset_size;
14613 /* Read an offset from the data stream. */
14616 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
14618 LONGEST retval = 0;
14620 switch (offset_size)
14623 retval = bfd_get_32 (abfd, buf);
14626 retval = bfd_get_64 (abfd, buf);
14629 internal_error (__FILE__, __LINE__,
14630 _("read_offset_1: bad switch [in module %s]"),
14631 bfd_get_filename (abfd));
14637 static const gdb_byte *
14638 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
14640 /* If the size of a host char is 8 bits, we can return a pointer
14641 to the buffer, otherwise we have to copy the data to a buffer
14642 allocated on the temporary obstack. */
14643 gdb_assert (HOST_CHAR_BIT == 8);
14647 static const char *
14648 read_direct_string (bfd *abfd, const gdb_byte *buf,
14649 unsigned int *bytes_read_ptr)
14651 /* If the size of a host char is 8 bits, we can return a pointer
14652 to the string, otherwise we have to copy the string to a buffer
14653 allocated on the temporary obstack. */
14654 gdb_assert (HOST_CHAR_BIT == 8);
14657 *bytes_read_ptr = 1;
14660 *bytes_read_ptr = strlen ((const char *) buf) + 1;
14661 return (const char *) buf;
14664 static const char *
14665 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
14667 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
14668 if (dwarf2_per_objfile->str.buffer == NULL)
14669 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
14670 bfd_get_filename (abfd));
14671 if (str_offset >= dwarf2_per_objfile->str.size)
14672 error (_("DW_FORM_strp pointing outside of "
14673 ".debug_str section [in module %s]"),
14674 bfd_get_filename (abfd));
14675 gdb_assert (HOST_CHAR_BIT == 8);
14676 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
14678 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
14681 /* Read a string at offset STR_OFFSET in the .debug_str section from
14682 the .dwz file DWZ. Throw an error if the offset is too large. If
14683 the string consists of a single NUL byte, return NULL; otherwise
14684 return a pointer to the string. */
14686 static const char *
14687 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
14689 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
14691 if (dwz->str.buffer == NULL)
14692 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
14693 "section [in module %s]"),
14694 bfd_get_filename (dwz->dwz_bfd));
14695 if (str_offset >= dwz->str.size)
14696 error (_("DW_FORM_GNU_strp_alt pointing outside of "
14697 ".debug_str section [in module %s]"),
14698 bfd_get_filename (dwz->dwz_bfd));
14699 gdb_assert (HOST_CHAR_BIT == 8);
14700 if (dwz->str.buffer[str_offset] == '\0')
14702 return (const char *) (dwz->str.buffer + str_offset);
14705 static const char *
14706 read_indirect_string (bfd *abfd, const gdb_byte *buf,
14707 const struct comp_unit_head *cu_header,
14708 unsigned int *bytes_read_ptr)
14710 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
14712 return read_indirect_string_at_offset (abfd, str_offset);
14716 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
14717 unsigned int *bytes_read_ptr)
14720 unsigned int num_read;
14722 unsigned char byte;
14730 byte = bfd_get_8 (abfd, buf);
14733 result |= ((ULONGEST) (byte & 127) << shift);
14734 if ((byte & 128) == 0)
14740 *bytes_read_ptr = num_read;
14745 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
14746 unsigned int *bytes_read_ptr)
14749 int i, shift, num_read;
14750 unsigned char byte;
14758 byte = bfd_get_8 (abfd, buf);
14761 result |= ((LONGEST) (byte & 127) << shift);
14763 if ((byte & 128) == 0)
14768 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
14769 result |= -(((LONGEST) 1) << shift);
14770 *bytes_read_ptr = num_read;
14774 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
14775 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
14776 ADDR_SIZE is the size of addresses from the CU header. */
14779 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
14781 struct objfile *objfile = dwarf2_per_objfile->objfile;
14782 bfd *abfd = objfile->obfd;
14783 const gdb_byte *info_ptr;
14785 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
14786 if (dwarf2_per_objfile->addr.buffer == NULL)
14787 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
14789 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
14790 error (_("DW_FORM_addr_index pointing outside of "
14791 ".debug_addr section [in module %s]"),
14793 info_ptr = (dwarf2_per_objfile->addr.buffer
14794 + addr_base + addr_index * addr_size);
14795 if (addr_size == 4)
14796 return bfd_get_32 (abfd, info_ptr);
14798 return bfd_get_64 (abfd, info_ptr);
14801 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
14804 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
14806 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
14809 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
14812 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
14813 unsigned int *bytes_read)
14815 bfd *abfd = cu->objfile->obfd;
14816 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
14818 return read_addr_index (cu, addr_index);
14821 /* Data structure to pass results from dwarf2_read_addr_index_reader
14822 back to dwarf2_read_addr_index. */
14824 struct dwarf2_read_addr_index_data
14826 ULONGEST addr_base;
14830 /* die_reader_func for dwarf2_read_addr_index. */
14833 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
14834 const gdb_byte *info_ptr,
14835 struct die_info *comp_unit_die,
14839 struct dwarf2_cu *cu = reader->cu;
14840 struct dwarf2_read_addr_index_data *aidata =
14841 (struct dwarf2_read_addr_index_data *) data;
14843 aidata->addr_base = cu->addr_base;
14844 aidata->addr_size = cu->header.addr_size;
14847 /* Given an index in .debug_addr, fetch the value.
14848 NOTE: This can be called during dwarf expression evaluation,
14849 long after the debug information has been read, and thus per_cu->cu
14850 may no longer exist. */
14853 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
14854 unsigned int addr_index)
14856 struct objfile *objfile = per_cu->objfile;
14857 struct dwarf2_cu *cu = per_cu->cu;
14858 ULONGEST addr_base;
14861 /* This is intended to be called from outside this file. */
14862 dw2_setup (objfile);
14864 /* We need addr_base and addr_size.
14865 If we don't have PER_CU->cu, we have to get it.
14866 Nasty, but the alternative is storing the needed info in PER_CU,
14867 which at this point doesn't seem justified: it's not clear how frequently
14868 it would get used and it would increase the size of every PER_CU.
14869 Entry points like dwarf2_per_cu_addr_size do a similar thing
14870 so we're not in uncharted territory here.
14871 Alas we need to be a bit more complicated as addr_base is contained
14874 We don't need to read the entire CU(/TU).
14875 We just need the header and top level die.
14877 IWBN to use the aging mechanism to let us lazily later discard the CU.
14878 For now we skip this optimization. */
14882 addr_base = cu->addr_base;
14883 addr_size = cu->header.addr_size;
14887 struct dwarf2_read_addr_index_data aidata;
14889 /* Note: We can't use init_cutu_and_read_dies_simple here,
14890 we need addr_base. */
14891 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
14892 dwarf2_read_addr_index_reader, &aidata);
14893 addr_base = aidata.addr_base;
14894 addr_size = aidata.addr_size;
14897 return read_addr_index_1 (addr_index, addr_base, addr_size);
14900 /* Given a DW_AT_str_index, fetch the string. */
14902 static const char *
14903 read_str_index (const struct die_reader_specs *reader,
14904 struct dwarf2_cu *cu, ULONGEST str_index)
14906 struct objfile *objfile = dwarf2_per_objfile->objfile;
14907 const char *dwo_name = objfile->name;
14908 bfd *abfd = objfile->obfd;
14909 struct dwo_sections *sections = &reader->dwo_file->sections;
14910 const gdb_byte *info_ptr;
14911 ULONGEST str_offset;
14913 dwarf2_read_section (objfile, §ions->str);
14914 dwarf2_read_section (objfile, §ions->str_offsets);
14915 if (sections->str.buffer == NULL)
14916 error (_("DW_FORM_str_index used without .debug_str.dwo section"
14917 " in CU at offset 0x%lx [in module %s]"),
14918 (long) cu->header.offset.sect_off, dwo_name);
14919 if (sections->str_offsets.buffer == NULL)
14920 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
14921 " in CU at offset 0x%lx [in module %s]"),
14922 (long) cu->header.offset.sect_off, dwo_name);
14923 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
14924 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
14925 " section in CU at offset 0x%lx [in module %s]"),
14926 (long) cu->header.offset.sect_off, dwo_name);
14927 info_ptr = (sections->str_offsets.buffer
14928 + str_index * cu->header.offset_size);
14929 if (cu->header.offset_size == 4)
14930 str_offset = bfd_get_32 (abfd, info_ptr);
14932 str_offset = bfd_get_64 (abfd, info_ptr);
14933 if (str_offset >= sections->str.size)
14934 error (_("Offset from DW_FORM_str_index pointing outside of"
14935 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
14936 (long) cu->header.offset.sect_off, dwo_name);
14937 return (const char *) (sections->str.buffer + str_offset);
14940 /* Return the length of an LEB128 number in BUF. */
14943 leb128_size (const gdb_byte *buf)
14945 const gdb_byte *begin = buf;
14951 if ((byte & 128) == 0)
14952 return buf - begin;
14957 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
14964 cu->language = language_c;
14966 case DW_LANG_C_plus_plus:
14967 cu->language = language_cplus;
14970 cu->language = language_d;
14972 case DW_LANG_Fortran77:
14973 case DW_LANG_Fortran90:
14974 case DW_LANG_Fortran95:
14975 cu->language = language_fortran;
14978 cu->language = language_go;
14980 case DW_LANG_Mips_Assembler:
14981 cu->language = language_asm;
14984 cu->language = language_java;
14986 case DW_LANG_Ada83:
14987 case DW_LANG_Ada95:
14988 cu->language = language_ada;
14990 case DW_LANG_Modula2:
14991 cu->language = language_m2;
14993 case DW_LANG_Pascal83:
14994 cu->language = language_pascal;
14997 cu->language = language_objc;
14999 case DW_LANG_Cobol74:
15000 case DW_LANG_Cobol85:
15002 cu->language = language_minimal;
15005 cu->language_defn = language_def (cu->language);
15008 /* Return the named attribute or NULL if not there. */
15010 static struct attribute *
15011 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15016 struct attribute *spec = NULL;
15018 for (i = 0; i < die->num_attrs; ++i)
15020 if (die->attrs[i].name == name)
15021 return &die->attrs[i];
15022 if (die->attrs[i].name == DW_AT_specification
15023 || die->attrs[i].name == DW_AT_abstract_origin)
15024 spec = &die->attrs[i];
15030 die = follow_die_ref (die, spec, &cu);
15036 /* Return the named attribute or NULL if not there,
15037 but do not follow DW_AT_specification, etc.
15038 This is for use in contexts where we're reading .debug_types dies.
15039 Following DW_AT_specification, DW_AT_abstract_origin will take us
15040 back up the chain, and we want to go down. */
15042 static struct attribute *
15043 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15047 for (i = 0; i < die->num_attrs; ++i)
15048 if (die->attrs[i].name == name)
15049 return &die->attrs[i];
15054 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15055 and holds a non-zero value. This function should only be used for
15056 DW_FORM_flag or DW_FORM_flag_present attributes. */
15059 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15061 struct attribute *attr = dwarf2_attr (die, name, cu);
15063 return (attr && DW_UNSND (attr));
15067 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15069 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15070 which value is non-zero. However, we have to be careful with
15071 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15072 (via dwarf2_flag_true_p) follows this attribute. So we may
15073 end up accidently finding a declaration attribute that belongs
15074 to a different DIE referenced by the specification attribute,
15075 even though the given DIE does not have a declaration attribute. */
15076 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15077 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15080 /* Return the die giving the specification for DIE, if there is
15081 one. *SPEC_CU is the CU containing DIE on input, and the CU
15082 containing the return value on output. If there is no
15083 specification, but there is an abstract origin, that is
15086 static struct die_info *
15087 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15089 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15092 if (spec_attr == NULL)
15093 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15095 if (spec_attr == NULL)
15098 return follow_die_ref (die, spec_attr, spec_cu);
15101 /* Free the line_header structure *LH, and any arrays and strings it
15103 NOTE: This is also used as a "cleanup" function. */
15106 free_line_header (struct line_header *lh)
15108 if (lh->standard_opcode_lengths)
15109 xfree (lh->standard_opcode_lengths);
15111 /* Remember that all the lh->file_names[i].name pointers are
15112 pointers into debug_line_buffer, and don't need to be freed. */
15113 if (lh->file_names)
15114 xfree (lh->file_names);
15116 /* Similarly for the include directory names. */
15117 if (lh->include_dirs)
15118 xfree (lh->include_dirs);
15123 /* Add an entry to LH's include directory table. */
15126 add_include_dir (struct line_header *lh, const char *include_dir)
15128 /* Grow the array if necessary. */
15129 if (lh->include_dirs_size == 0)
15131 lh->include_dirs_size = 1; /* for testing */
15132 lh->include_dirs = xmalloc (lh->include_dirs_size
15133 * sizeof (*lh->include_dirs));
15135 else if (lh->num_include_dirs >= lh->include_dirs_size)
15137 lh->include_dirs_size *= 2;
15138 lh->include_dirs = xrealloc (lh->include_dirs,
15139 (lh->include_dirs_size
15140 * sizeof (*lh->include_dirs)));
15143 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15146 /* Add an entry to LH's file name table. */
15149 add_file_name (struct line_header *lh,
15151 unsigned int dir_index,
15152 unsigned int mod_time,
15153 unsigned int length)
15155 struct file_entry *fe;
15157 /* Grow the array if necessary. */
15158 if (lh->file_names_size == 0)
15160 lh->file_names_size = 1; /* for testing */
15161 lh->file_names = xmalloc (lh->file_names_size
15162 * sizeof (*lh->file_names));
15164 else if (lh->num_file_names >= lh->file_names_size)
15166 lh->file_names_size *= 2;
15167 lh->file_names = xrealloc (lh->file_names,
15168 (lh->file_names_size
15169 * sizeof (*lh->file_names)));
15172 fe = &lh->file_names[lh->num_file_names++];
15174 fe->dir_index = dir_index;
15175 fe->mod_time = mod_time;
15176 fe->length = length;
15177 fe->included_p = 0;
15181 /* A convenience function to find the proper .debug_line section for a
15184 static struct dwarf2_section_info *
15185 get_debug_line_section (struct dwarf2_cu *cu)
15187 struct dwarf2_section_info *section;
15189 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15191 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15192 section = &cu->dwo_unit->dwo_file->sections.line;
15193 else if (cu->per_cu->is_dwz)
15195 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15197 section = &dwz->line;
15200 section = &dwarf2_per_objfile->line;
15205 /* Read the statement program header starting at OFFSET in
15206 .debug_line, or .debug_line.dwo. Return a pointer
15207 to a struct line_header, allocated using xmalloc.
15209 NOTE: the strings in the include directory and file name tables of
15210 the returned object point into the dwarf line section buffer,
15211 and must not be freed. */
15213 static struct line_header *
15214 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15216 struct cleanup *back_to;
15217 struct line_header *lh;
15218 const gdb_byte *line_ptr;
15219 unsigned int bytes_read, offset_size;
15221 const char *cur_dir, *cur_file;
15222 struct dwarf2_section_info *section;
15225 section = get_debug_line_section (cu);
15226 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15227 if (section->buffer == NULL)
15229 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15230 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15232 complaint (&symfile_complaints, _("missing .debug_line section"));
15236 /* We can't do this until we know the section is non-empty.
15237 Only then do we know we have such a section. */
15238 abfd = section->asection->owner;
15240 /* Make sure that at least there's room for the total_length field.
15241 That could be 12 bytes long, but we're just going to fudge that. */
15242 if (offset + 4 >= section->size)
15244 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15248 lh = xmalloc (sizeof (*lh));
15249 memset (lh, 0, sizeof (*lh));
15250 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15253 line_ptr = section->buffer + offset;
15255 /* Read in the header. */
15257 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15258 &bytes_read, &offset_size);
15259 line_ptr += bytes_read;
15260 if (line_ptr + lh->total_length > (section->buffer + section->size))
15262 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15265 lh->statement_program_end = line_ptr + lh->total_length;
15266 lh->version = read_2_bytes (abfd, line_ptr);
15268 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15269 line_ptr += offset_size;
15270 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15272 if (lh->version >= 4)
15274 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15278 lh->maximum_ops_per_instruction = 1;
15280 if (lh->maximum_ops_per_instruction == 0)
15282 lh->maximum_ops_per_instruction = 1;
15283 complaint (&symfile_complaints,
15284 _("invalid maximum_ops_per_instruction "
15285 "in `.debug_line' section"));
15288 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15290 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15292 lh->line_range = read_1_byte (abfd, line_ptr);
15294 lh->opcode_base = read_1_byte (abfd, line_ptr);
15296 lh->standard_opcode_lengths
15297 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15299 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15300 for (i = 1; i < lh->opcode_base; ++i)
15302 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15306 /* Read directory table. */
15307 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15309 line_ptr += bytes_read;
15310 add_include_dir (lh, cur_dir);
15312 line_ptr += bytes_read;
15314 /* Read file name table. */
15315 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15317 unsigned int dir_index, mod_time, length;
15319 line_ptr += bytes_read;
15320 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15321 line_ptr += bytes_read;
15322 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15323 line_ptr += bytes_read;
15324 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15325 line_ptr += bytes_read;
15327 add_file_name (lh, cur_file, dir_index, mod_time, length);
15329 line_ptr += bytes_read;
15330 lh->statement_program_start = line_ptr;
15332 if (line_ptr > (section->buffer + section->size))
15333 complaint (&symfile_complaints,
15334 _("line number info header doesn't "
15335 "fit in `.debug_line' section"));
15337 discard_cleanups (back_to);
15341 /* Subroutine of dwarf_decode_lines to simplify it.
15342 Return the file name of the psymtab for included file FILE_INDEX
15343 in line header LH of PST.
15344 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15345 If space for the result is malloc'd, it will be freed by a cleanup.
15346 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15348 The function creates dangling cleanup registration. */
15350 static const char *
15351 psymtab_include_file_name (const struct line_header *lh, int file_index,
15352 const struct partial_symtab *pst,
15353 const char *comp_dir)
15355 const struct file_entry fe = lh->file_names [file_index];
15356 const char *include_name = fe.name;
15357 const char *include_name_to_compare = include_name;
15358 const char *dir_name = NULL;
15359 const char *pst_filename;
15360 char *copied_name = NULL;
15364 dir_name = lh->include_dirs[fe.dir_index - 1];
15366 if (!IS_ABSOLUTE_PATH (include_name)
15367 && (dir_name != NULL || comp_dir != NULL))
15369 /* Avoid creating a duplicate psymtab for PST.
15370 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15371 Before we do the comparison, however, we need to account
15372 for DIR_NAME and COMP_DIR.
15373 First prepend dir_name (if non-NULL). If we still don't
15374 have an absolute path prepend comp_dir (if non-NULL).
15375 However, the directory we record in the include-file's
15376 psymtab does not contain COMP_DIR (to match the
15377 corresponding symtab(s)).
15382 bash$ gcc -g ./hello.c
15383 include_name = "hello.c"
15385 DW_AT_comp_dir = comp_dir = "/tmp"
15386 DW_AT_name = "./hello.c" */
15388 if (dir_name != NULL)
15390 char *tem = concat (dir_name, SLASH_STRING,
15391 include_name, (char *)NULL);
15393 make_cleanup (xfree, tem);
15394 include_name = tem;
15395 include_name_to_compare = include_name;
15397 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15399 char *tem = concat (comp_dir, SLASH_STRING,
15400 include_name, (char *)NULL);
15402 make_cleanup (xfree, tem);
15403 include_name_to_compare = tem;
15407 pst_filename = pst->filename;
15408 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15410 copied_name = concat (pst->dirname, SLASH_STRING,
15411 pst_filename, (char *)NULL);
15412 pst_filename = copied_name;
15415 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15417 if (copied_name != NULL)
15418 xfree (copied_name);
15422 return include_name;
15425 /* Ignore this record_line request. */
15428 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15433 /* Subroutine of dwarf_decode_lines to simplify it.
15434 Process the line number information in LH. */
15437 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15438 struct dwarf2_cu *cu, struct partial_symtab *pst)
15440 const gdb_byte *line_ptr, *extended_end;
15441 const gdb_byte *line_end;
15442 unsigned int bytes_read, extended_len;
15443 unsigned char op_code, extended_op, adj_opcode;
15444 CORE_ADDR baseaddr;
15445 struct objfile *objfile = cu->objfile;
15446 bfd *abfd = objfile->obfd;
15447 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15448 const int decode_for_pst_p = (pst != NULL);
15449 struct subfile *last_subfile = NULL;
15450 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15453 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15455 line_ptr = lh->statement_program_start;
15456 line_end = lh->statement_program_end;
15458 /* Read the statement sequences until there's nothing left. */
15459 while (line_ptr < line_end)
15461 /* state machine registers */
15462 CORE_ADDR address = 0;
15463 unsigned int file = 1;
15464 unsigned int line = 1;
15465 unsigned int column = 0;
15466 int is_stmt = lh->default_is_stmt;
15467 int basic_block = 0;
15468 int end_sequence = 0;
15470 unsigned char op_index = 0;
15472 if (!decode_for_pst_p && lh->num_file_names >= file)
15474 /* Start a subfile for the current file of the state machine. */
15475 /* lh->include_dirs and lh->file_names are 0-based, but the
15476 directory and file name numbers in the statement program
15478 struct file_entry *fe = &lh->file_names[file - 1];
15479 const char *dir = NULL;
15482 dir = lh->include_dirs[fe->dir_index - 1];
15484 dwarf2_start_subfile (fe->name, dir, comp_dir);
15487 /* Decode the table. */
15488 while (!end_sequence)
15490 op_code = read_1_byte (abfd, line_ptr);
15492 if (line_ptr > line_end)
15494 dwarf2_debug_line_missing_end_sequence_complaint ();
15498 if (op_code >= lh->opcode_base)
15500 /* Special operand. */
15501 adj_opcode = op_code - lh->opcode_base;
15502 address += (((op_index + (adj_opcode / lh->line_range))
15503 / lh->maximum_ops_per_instruction)
15504 * lh->minimum_instruction_length);
15505 op_index = ((op_index + (adj_opcode / lh->line_range))
15506 % lh->maximum_ops_per_instruction);
15507 line += lh->line_base + (adj_opcode % lh->line_range);
15508 if (lh->num_file_names < file || file == 0)
15509 dwarf2_debug_line_missing_file_complaint ();
15510 /* For now we ignore lines not starting on an
15511 instruction boundary. */
15512 else if (op_index == 0)
15514 lh->file_names[file - 1].included_p = 1;
15515 if (!decode_for_pst_p && is_stmt)
15517 if (last_subfile != current_subfile)
15519 addr = gdbarch_addr_bits_remove (gdbarch, address);
15521 (*p_record_line) (last_subfile, 0, addr);
15522 last_subfile = current_subfile;
15524 /* Append row to matrix using current values. */
15525 addr = gdbarch_addr_bits_remove (gdbarch, address);
15526 (*p_record_line) (current_subfile, line, addr);
15531 else switch (op_code)
15533 case DW_LNS_extended_op:
15534 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15536 line_ptr += bytes_read;
15537 extended_end = line_ptr + extended_len;
15538 extended_op = read_1_byte (abfd, line_ptr);
15540 switch (extended_op)
15542 case DW_LNE_end_sequence:
15543 p_record_line = record_line;
15546 case DW_LNE_set_address:
15547 address = read_address (abfd, line_ptr, cu, &bytes_read);
15549 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15551 /* This line table is for a function which has been
15552 GCd by the linker. Ignore it. PR gdb/12528 */
15555 = line_ptr - get_debug_line_section (cu)->buffer;
15557 complaint (&symfile_complaints,
15558 _(".debug_line address at offset 0x%lx is 0 "
15560 line_offset, objfile->name);
15561 p_record_line = noop_record_line;
15565 line_ptr += bytes_read;
15566 address += baseaddr;
15568 case DW_LNE_define_file:
15570 const char *cur_file;
15571 unsigned int dir_index, mod_time, length;
15573 cur_file = read_direct_string (abfd, line_ptr,
15575 line_ptr += bytes_read;
15577 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15578 line_ptr += bytes_read;
15580 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15581 line_ptr += bytes_read;
15583 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15584 line_ptr += bytes_read;
15585 add_file_name (lh, cur_file, dir_index, mod_time, length);
15588 case DW_LNE_set_discriminator:
15589 /* The discriminator is not interesting to the debugger;
15591 line_ptr = extended_end;
15594 complaint (&symfile_complaints,
15595 _("mangled .debug_line section"));
15598 /* Make sure that we parsed the extended op correctly. If e.g.
15599 we expected a different address size than the producer used,
15600 we may have read the wrong number of bytes. */
15601 if (line_ptr != extended_end)
15603 complaint (&symfile_complaints,
15604 _("mangled .debug_line section"));
15609 if (lh->num_file_names < file || file == 0)
15610 dwarf2_debug_line_missing_file_complaint ();
15613 lh->file_names[file - 1].included_p = 1;
15614 if (!decode_for_pst_p && is_stmt)
15616 if (last_subfile != current_subfile)
15618 addr = gdbarch_addr_bits_remove (gdbarch, address);
15620 (*p_record_line) (last_subfile, 0, addr);
15621 last_subfile = current_subfile;
15623 addr = gdbarch_addr_bits_remove (gdbarch, address);
15624 (*p_record_line) (current_subfile, line, addr);
15629 case DW_LNS_advance_pc:
15632 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15634 address += (((op_index + adjust)
15635 / lh->maximum_ops_per_instruction)
15636 * lh->minimum_instruction_length);
15637 op_index = ((op_index + adjust)
15638 % lh->maximum_ops_per_instruction);
15639 line_ptr += bytes_read;
15642 case DW_LNS_advance_line:
15643 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
15644 line_ptr += bytes_read;
15646 case DW_LNS_set_file:
15648 /* The arrays lh->include_dirs and lh->file_names are
15649 0-based, but the directory and file name numbers in
15650 the statement program are 1-based. */
15651 struct file_entry *fe;
15652 const char *dir = NULL;
15654 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15655 line_ptr += bytes_read;
15656 if (lh->num_file_names < file || file == 0)
15657 dwarf2_debug_line_missing_file_complaint ();
15660 fe = &lh->file_names[file - 1];
15662 dir = lh->include_dirs[fe->dir_index - 1];
15663 if (!decode_for_pst_p)
15665 last_subfile = current_subfile;
15666 dwarf2_start_subfile (fe->name, dir, comp_dir);
15671 case DW_LNS_set_column:
15672 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15673 line_ptr += bytes_read;
15675 case DW_LNS_negate_stmt:
15676 is_stmt = (!is_stmt);
15678 case DW_LNS_set_basic_block:
15681 /* Add to the address register of the state machine the
15682 address increment value corresponding to special opcode
15683 255. I.e., this value is scaled by the minimum
15684 instruction length since special opcode 255 would have
15685 scaled the increment. */
15686 case DW_LNS_const_add_pc:
15688 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
15690 address += (((op_index + adjust)
15691 / lh->maximum_ops_per_instruction)
15692 * lh->minimum_instruction_length);
15693 op_index = ((op_index + adjust)
15694 % lh->maximum_ops_per_instruction);
15697 case DW_LNS_fixed_advance_pc:
15698 address += read_2_bytes (abfd, line_ptr);
15704 /* Unknown standard opcode, ignore it. */
15707 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
15709 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15710 line_ptr += bytes_read;
15715 if (lh->num_file_names < file || file == 0)
15716 dwarf2_debug_line_missing_file_complaint ();
15719 lh->file_names[file - 1].included_p = 1;
15720 if (!decode_for_pst_p)
15722 addr = gdbarch_addr_bits_remove (gdbarch, address);
15723 (*p_record_line) (current_subfile, 0, addr);
15729 /* Decode the Line Number Program (LNP) for the given line_header
15730 structure and CU. The actual information extracted and the type
15731 of structures created from the LNP depends on the value of PST.
15733 1. If PST is NULL, then this procedure uses the data from the program
15734 to create all necessary symbol tables, and their linetables.
15736 2. If PST is not NULL, this procedure reads the program to determine
15737 the list of files included by the unit represented by PST, and
15738 builds all the associated partial symbol tables.
15740 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15741 It is used for relative paths in the line table.
15742 NOTE: When processing partial symtabs (pst != NULL),
15743 comp_dir == pst->dirname.
15745 NOTE: It is important that psymtabs have the same file name (via strcmp)
15746 as the corresponding symtab. Since COMP_DIR is not used in the name of the
15747 symtab we don't use it in the name of the psymtabs we create.
15748 E.g. expand_line_sal requires this when finding psymtabs to expand.
15749 A good testcase for this is mb-inline.exp. */
15752 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
15753 struct dwarf2_cu *cu, struct partial_symtab *pst,
15754 int want_line_info)
15756 struct objfile *objfile = cu->objfile;
15757 const int decode_for_pst_p = (pst != NULL);
15758 struct subfile *first_subfile = current_subfile;
15760 if (want_line_info)
15761 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
15763 if (decode_for_pst_p)
15767 /* Now that we're done scanning the Line Header Program, we can
15768 create the psymtab of each included file. */
15769 for (file_index = 0; file_index < lh->num_file_names; file_index++)
15770 if (lh->file_names[file_index].included_p == 1)
15772 const char *include_name =
15773 psymtab_include_file_name (lh, file_index, pst, comp_dir);
15774 if (include_name != NULL)
15775 dwarf2_create_include_psymtab (include_name, pst, objfile);
15780 /* Make sure a symtab is created for every file, even files
15781 which contain only variables (i.e. no code with associated
15785 for (i = 0; i < lh->num_file_names; i++)
15787 const char *dir = NULL;
15788 struct file_entry *fe;
15790 fe = &lh->file_names[i];
15792 dir = lh->include_dirs[fe->dir_index - 1];
15793 dwarf2_start_subfile (fe->name, dir, comp_dir);
15795 /* Skip the main file; we don't need it, and it must be
15796 allocated last, so that it will show up before the
15797 non-primary symtabs in the objfile's symtab list. */
15798 if (current_subfile == first_subfile)
15801 if (current_subfile->symtab == NULL)
15802 current_subfile->symtab = allocate_symtab (current_subfile->name,
15804 fe->symtab = current_subfile->symtab;
15809 /* Start a subfile for DWARF. FILENAME is the name of the file and
15810 DIRNAME the name of the source directory which contains FILENAME
15811 or NULL if not known. COMP_DIR is the compilation directory for the
15812 linetable's compilation unit or NULL if not known.
15813 This routine tries to keep line numbers from identical absolute and
15814 relative file names in a common subfile.
15816 Using the `list' example from the GDB testsuite, which resides in
15817 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
15818 of /srcdir/list0.c yields the following debugging information for list0.c:
15820 DW_AT_name: /srcdir/list0.c
15821 DW_AT_comp_dir: /compdir
15822 files.files[0].name: list0.h
15823 files.files[0].dir: /srcdir
15824 files.files[1].name: list0.c
15825 files.files[1].dir: /srcdir
15827 The line number information for list0.c has to end up in a single
15828 subfile, so that `break /srcdir/list0.c:1' works as expected.
15829 start_subfile will ensure that this happens provided that we pass the
15830 concatenation of files.files[1].dir and files.files[1].name as the
15834 dwarf2_start_subfile (const char *filename, const char *dirname,
15835 const char *comp_dir)
15839 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
15840 `start_symtab' will always pass the contents of DW_AT_comp_dir as
15841 second argument to start_subfile. To be consistent, we do the
15842 same here. In order not to lose the line information directory,
15843 we concatenate it to the filename when it makes sense.
15844 Note that the Dwarf3 standard says (speaking of filenames in line
15845 information): ``The directory index is ignored for file names
15846 that represent full path names''. Thus ignoring dirname in the
15847 `else' branch below isn't an issue. */
15849 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
15851 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
15855 start_subfile (filename, comp_dir);
15861 /* Start a symtab for DWARF.
15862 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
15865 dwarf2_start_symtab (struct dwarf2_cu *cu,
15866 const char *name, const char *comp_dir, CORE_ADDR low_pc)
15868 start_symtab (name, comp_dir, low_pc);
15869 record_debugformat ("DWARF 2");
15870 record_producer (cu->producer);
15872 /* We assume that we're processing GCC output. */
15873 processing_gcc_compilation = 2;
15875 cu->processing_has_namespace_info = 0;
15879 var_decode_location (struct attribute *attr, struct symbol *sym,
15880 struct dwarf2_cu *cu)
15882 struct objfile *objfile = cu->objfile;
15883 struct comp_unit_head *cu_header = &cu->header;
15885 /* NOTE drow/2003-01-30: There used to be a comment and some special
15886 code here to turn a symbol with DW_AT_external and a
15887 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
15888 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
15889 with some versions of binutils) where shared libraries could have
15890 relocations against symbols in their debug information - the
15891 minimal symbol would have the right address, but the debug info
15892 would not. It's no longer necessary, because we will explicitly
15893 apply relocations when we read in the debug information now. */
15895 /* A DW_AT_location attribute with no contents indicates that a
15896 variable has been optimized away. */
15897 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
15899 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
15903 /* Handle one degenerate form of location expression specially, to
15904 preserve GDB's previous behavior when section offsets are
15905 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
15906 then mark this symbol as LOC_STATIC. */
15908 if (attr_form_is_block (attr)
15909 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
15910 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
15911 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
15912 && (DW_BLOCK (attr)->size
15913 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
15915 unsigned int dummy;
15917 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
15918 SYMBOL_VALUE_ADDRESS (sym) =
15919 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
15921 SYMBOL_VALUE_ADDRESS (sym) =
15922 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
15923 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
15924 fixup_symbol_section (sym, objfile);
15925 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
15926 SYMBOL_SECTION (sym));
15930 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
15931 expression evaluator, and use LOC_COMPUTED only when necessary
15932 (i.e. when the value of a register or memory location is
15933 referenced, or a thread-local block, etc.). Then again, it might
15934 not be worthwhile. I'm assuming that it isn't unless performance
15935 or memory numbers show me otherwise. */
15937 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
15939 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
15940 cu->has_loclist = 1;
15943 /* Given a pointer to a DWARF information entry, figure out if we need
15944 to make a symbol table entry for it, and if so, create a new entry
15945 and return a pointer to it.
15946 If TYPE is NULL, determine symbol type from the die, otherwise
15947 used the passed type.
15948 If SPACE is not NULL, use it to hold the new symbol. If it is
15949 NULL, allocate a new symbol on the objfile's obstack. */
15951 static struct symbol *
15952 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
15953 struct symbol *space)
15955 struct objfile *objfile = cu->objfile;
15956 struct symbol *sym = NULL;
15958 struct attribute *attr = NULL;
15959 struct attribute *attr2 = NULL;
15960 CORE_ADDR baseaddr;
15961 struct pending **list_to_add = NULL;
15963 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
15965 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15967 name = dwarf2_name (die, cu);
15970 const char *linkagename;
15971 int suppress_add = 0;
15976 sym = allocate_symbol (objfile);
15977 OBJSTAT (objfile, n_syms++);
15979 /* Cache this symbol's name and the name's demangled form (if any). */
15980 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
15981 linkagename = dwarf2_physname (name, die, cu);
15982 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
15984 /* Fortran does not have mangling standard and the mangling does differ
15985 between gfortran, iFort etc. */
15986 if (cu->language == language_fortran
15987 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
15988 symbol_set_demangled_name (&(sym->ginfo),
15989 dwarf2_full_name (name, die, cu),
15992 /* Default assumptions.
15993 Use the passed type or decode it from the die. */
15994 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
15995 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
15997 SYMBOL_TYPE (sym) = type;
15999 SYMBOL_TYPE (sym) = die_type (die, cu);
16000 attr = dwarf2_attr (die,
16001 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16005 SYMBOL_LINE (sym) = DW_UNSND (attr);
16008 attr = dwarf2_attr (die,
16009 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16013 int file_index = DW_UNSND (attr);
16015 if (cu->line_header == NULL
16016 || file_index > cu->line_header->num_file_names)
16017 complaint (&symfile_complaints,
16018 _("file index out of range"));
16019 else if (file_index > 0)
16021 struct file_entry *fe;
16023 fe = &cu->line_header->file_names[file_index - 1];
16024 SYMBOL_SYMTAB (sym) = fe->symtab;
16031 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16034 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16036 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16037 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16038 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16039 add_symbol_to_list (sym, cu->list_in_scope);
16041 case DW_TAG_subprogram:
16042 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16044 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16045 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16046 if ((attr2 && (DW_UNSND (attr2) != 0))
16047 || cu->language == language_ada)
16049 /* Subprograms marked external are stored as a global symbol.
16050 Ada subprograms, whether marked external or not, are always
16051 stored as a global symbol, because we want to be able to
16052 access them globally. For instance, we want to be able
16053 to break on a nested subprogram without having to
16054 specify the context. */
16055 list_to_add = &global_symbols;
16059 list_to_add = cu->list_in_scope;
16062 case DW_TAG_inlined_subroutine:
16063 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16065 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16066 SYMBOL_INLINED (sym) = 1;
16067 list_to_add = cu->list_in_scope;
16069 case DW_TAG_template_value_param:
16071 /* Fall through. */
16072 case DW_TAG_constant:
16073 case DW_TAG_variable:
16074 case DW_TAG_member:
16075 /* Compilation with minimal debug info may result in
16076 variables with missing type entries. Change the
16077 misleading `void' type to something sensible. */
16078 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16080 = objfile_type (objfile)->nodebug_data_symbol;
16082 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16083 /* In the case of DW_TAG_member, we should only be called for
16084 static const members. */
16085 if (die->tag == DW_TAG_member)
16087 /* dwarf2_add_field uses die_is_declaration,
16088 so we do the same. */
16089 gdb_assert (die_is_declaration (die, cu));
16094 dwarf2_const_value (attr, sym, cu);
16095 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16098 if (attr2 && (DW_UNSND (attr2) != 0))
16099 list_to_add = &global_symbols;
16101 list_to_add = cu->list_in_scope;
16105 attr = dwarf2_attr (die, DW_AT_location, cu);
16108 var_decode_location (attr, sym, cu);
16109 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16111 /* Fortran explicitly imports any global symbols to the local
16112 scope by DW_TAG_common_block. */
16113 if (cu->language == language_fortran && die->parent
16114 && die->parent->tag == DW_TAG_common_block)
16117 if (SYMBOL_CLASS (sym) == LOC_STATIC
16118 && SYMBOL_VALUE_ADDRESS (sym) == 0
16119 && !dwarf2_per_objfile->has_section_at_zero)
16121 /* When a static variable is eliminated by the linker,
16122 the corresponding debug information is not stripped
16123 out, but the variable address is set to null;
16124 do not add such variables into symbol table. */
16126 else if (attr2 && (DW_UNSND (attr2) != 0))
16128 /* Workaround gfortran PR debug/40040 - it uses
16129 DW_AT_location for variables in -fPIC libraries which may
16130 get overriden by other libraries/executable and get
16131 a different address. Resolve it by the minimal symbol
16132 which may come from inferior's executable using copy
16133 relocation. Make this workaround only for gfortran as for
16134 other compilers GDB cannot guess the minimal symbol
16135 Fortran mangling kind. */
16136 if (cu->language == language_fortran && die->parent
16137 && die->parent->tag == DW_TAG_module
16139 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16140 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16142 /* A variable with DW_AT_external is never static,
16143 but it may be block-scoped. */
16144 list_to_add = (cu->list_in_scope == &file_symbols
16145 ? &global_symbols : cu->list_in_scope);
16148 list_to_add = cu->list_in_scope;
16152 /* We do not know the address of this symbol.
16153 If it is an external symbol and we have type information
16154 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16155 The address of the variable will then be determined from
16156 the minimal symbol table whenever the variable is
16158 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16160 /* Fortran explicitly imports any global symbols to the local
16161 scope by DW_TAG_common_block. */
16162 if (cu->language == language_fortran && die->parent
16163 && die->parent->tag == DW_TAG_common_block)
16165 /* SYMBOL_CLASS doesn't matter here because
16166 read_common_block is going to reset it. */
16168 list_to_add = cu->list_in_scope;
16170 else if (attr2 && (DW_UNSND (attr2) != 0)
16171 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16173 /* A variable with DW_AT_external is never static, but it
16174 may be block-scoped. */
16175 list_to_add = (cu->list_in_scope == &file_symbols
16176 ? &global_symbols : cu->list_in_scope);
16178 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16180 else if (!die_is_declaration (die, cu))
16182 /* Use the default LOC_OPTIMIZED_OUT class. */
16183 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16185 list_to_add = cu->list_in_scope;
16189 case DW_TAG_formal_parameter:
16190 /* If we are inside a function, mark this as an argument. If
16191 not, we might be looking at an argument to an inlined function
16192 when we do not have enough information to show inlined frames;
16193 pretend it's a local variable in that case so that the user can
16195 if (context_stack_depth > 0
16196 && context_stack[context_stack_depth - 1].name != NULL)
16197 SYMBOL_IS_ARGUMENT (sym) = 1;
16198 attr = dwarf2_attr (die, DW_AT_location, cu);
16201 var_decode_location (attr, sym, cu);
16203 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16206 dwarf2_const_value (attr, sym, cu);
16209 list_to_add = cu->list_in_scope;
16211 case DW_TAG_unspecified_parameters:
16212 /* From varargs functions; gdb doesn't seem to have any
16213 interest in this information, so just ignore it for now.
16216 case DW_TAG_template_type_param:
16218 /* Fall through. */
16219 case DW_TAG_class_type:
16220 case DW_TAG_interface_type:
16221 case DW_TAG_structure_type:
16222 case DW_TAG_union_type:
16223 case DW_TAG_set_type:
16224 case DW_TAG_enumeration_type:
16225 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16226 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16229 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16230 really ever be static objects: otherwise, if you try
16231 to, say, break of a class's method and you're in a file
16232 which doesn't mention that class, it won't work unless
16233 the check for all static symbols in lookup_symbol_aux
16234 saves you. See the OtherFileClass tests in
16235 gdb.c++/namespace.exp. */
16239 list_to_add = (cu->list_in_scope == &file_symbols
16240 && (cu->language == language_cplus
16241 || cu->language == language_java)
16242 ? &global_symbols : cu->list_in_scope);
16244 /* The semantics of C++ state that "struct foo {
16245 ... }" also defines a typedef for "foo". A Java
16246 class declaration also defines a typedef for the
16248 if (cu->language == language_cplus
16249 || cu->language == language_java
16250 || cu->language == language_ada)
16252 /* The symbol's name is already allocated along
16253 with this objfile, so we don't need to
16254 duplicate it for the type. */
16255 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16256 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16261 case DW_TAG_typedef:
16262 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16263 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16264 list_to_add = cu->list_in_scope;
16266 case DW_TAG_base_type:
16267 case DW_TAG_subrange_type:
16268 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16269 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16270 list_to_add = cu->list_in_scope;
16272 case DW_TAG_enumerator:
16273 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16276 dwarf2_const_value (attr, sym, cu);
16279 /* NOTE: carlton/2003-11-10: See comment above in the
16280 DW_TAG_class_type, etc. block. */
16282 list_to_add = (cu->list_in_scope == &file_symbols
16283 && (cu->language == language_cplus
16284 || cu->language == language_java)
16285 ? &global_symbols : cu->list_in_scope);
16288 case DW_TAG_namespace:
16289 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16290 list_to_add = &global_symbols;
16292 case DW_TAG_common_block:
16293 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16294 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16295 add_symbol_to_list (sym, cu->list_in_scope);
16298 /* Not a tag we recognize. Hopefully we aren't processing
16299 trash data, but since we must specifically ignore things
16300 we don't recognize, there is nothing else we should do at
16302 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16303 dwarf_tag_name (die->tag));
16309 sym->hash_next = objfile->template_symbols;
16310 objfile->template_symbols = sym;
16311 list_to_add = NULL;
16314 if (list_to_add != NULL)
16315 add_symbol_to_list (sym, list_to_add);
16317 /* For the benefit of old versions of GCC, check for anonymous
16318 namespaces based on the demangled name. */
16319 if (!cu->processing_has_namespace_info
16320 && cu->language == language_cplus)
16321 cp_scan_for_anonymous_namespaces (sym, objfile);
16326 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16328 static struct symbol *
16329 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16331 return new_symbol_full (die, type, cu, NULL);
16334 /* Given an attr with a DW_FORM_dataN value in host byte order,
16335 zero-extend it as appropriate for the symbol's type. The DWARF
16336 standard (v4) is not entirely clear about the meaning of using
16337 DW_FORM_dataN for a constant with a signed type, where the type is
16338 wider than the data. The conclusion of a discussion on the DWARF
16339 list was that this is unspecified. We choose to always zero-extend
16340 because that is the interpretation long in use by GCC. */
16343 dwarf2_const_value_data (struct attribute *attr, struct type *type,
16344 const char *name, struct obstack *obstack,
16345 struct dwarf2_cu *cu, LONGEST *value, int bits)
16347 struct objfile *objfile = cu->objfile;
16348 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16349 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16350 LONGEST l = DW_UNSND (attr);
16352 if (bits < sizeof (*value) * 8)
16354 l &= ((LONGEST) 1 << bits) - 1;
16357 else if (bits == sizeof (*value) * 8)
16361 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16362 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16369 /* Read a constant value from an attribute. Either set *VALUE, or if
16370 the value does not fit in *VALUE, set *BYTES - either already
16371 allocated on the objfile obstack, or newly allocated on OBSTACK,
16372 or, set *BATON, if we translated the constant to a location
16376 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16377 const char *name, struct obstack *obstack,
16378 struct dwarf2_cu *cu,
16379 LONGEST *value, const gdb_byte **bytes,
16380 struct dwarf2_locexpr_baton **baton)
16382 struct objfile *objfile = cu->objfile;
16383 struct comp_unit_head *cu_header = &cu->header;
16384 struct dwarf_block *blk;
16385 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16386 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16392 switch (attr->form)
16395 case DW_FORM_GNU_addr_index:
16399 if (TYPE_LENGTH (type) != cu_header->addr_size)
16400 dwarf2_const_value_length_mismatch_complaint (name,
16401 cu_header->addr_size,
16402 TYPE_LENGTH (type));
16403 /* Symbols of this form are reasonably rare, so we just
16404 piggyback on the existing location code rather than writing
16405 a new implementation of symbol_computed_ops. */
16406 *baton = obstack_alloc (&objfile->objfile_obstack,
16407 sizeof (struct dwarf2_locexpr_baton));
16408 (*baton)->per_cu = cu->per_cu;
16409 gdb_assert ((*baton)->per_cu);
16411 (*baton)->size = 2 + cu_header->addr_size;
16412 data = obstack_alloc (&objfile->objfile_obstack, (*baton)->size);
16413 (*baton)->data = data;
16415 data[0] = DW_OP_addr;
16416 store_unsigned_integer (&data[1], cu_header->addr_size,
16417 byte_order, DW_ADDR (attr));
16418 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16421 case DW_FORM_string:
16423 case DW_FORM_GNU_str_index:
16424 case DW_FORM_GNU_strp_alt:
16425 /* DW_STRING is already allocated on the objfile obstack, point
16427 *bytes = (const gdb_byte *) DW_STRING (attr);
16429 case DW_FORM_block1:
16430 case DW_FORM_block2:
16431 case DW_FORM_block4:
16432 case DW_FORM_block:
16433 case DW_FORM_exprloc:
16434 blk = DW_BLOCK (attr);
16435 if (TYPE_LENGTH (type) != blk->size)
16436 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16437 TYPE_LENGTH (type));
16438 *bytes = blk->data;
16441 /* The DW_AT_const_value attributes are supposed to carry the
16442 symbol's value "represented as it would be on the target
16443 architecture." By the time we get here, it's already been
16444 converted to host endianness, so we just need to sign- or
16445 zero-extend it as appropriate. */
16446 case DW_FORM_data1:
16447 *bytes = dwarf2_const_value_data (attr, type, name,
16448 obstack, cu, value, 8);
16450 case DW_FORM_data2:
16451 *bytes = dwarf2_const_value_data (attr, type, name,
16452 obstack, cu, value, 16);
16454 case DW_FORM_data4:
16455 *bytes = dwarf2_const_value_data (attr, type, name,
16456 obstack, cu, value, 32);
16458 case DW_FORM_data8:
16459 *bytes = dwarf2_const_value_data (attr, type, name,
16460 obstack, cu, value, 64);
16463 case DW_FORM_sdata:
16464 *value = DW_SND (attr);
16467 case DW_FORM_udata:
16468 *value = DW_UNSND (attr);
16472 complaint (&symfile_complaints,
16473 _("unsupported const value attribute form: '%s'"),
16474 dwarf_form_name (attr->form));
16481 /* Copy constant value from an attribute to a symbol. */
16484 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16485 struct dwarf2_cu *cu)
16487 struct objfile *objfile = cu->objfile;
16488 struct comp_unit_head *cu_header = &cu->header;
16490 const gdb_byte *bytes;
16491 struct dwarf2_locexpr_baton *baton;
16493 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16494 SYMBOL_PRINT_NAME (sym),
16495 &objfile->objfile_obstack, cu,
16496 &value, &bytes, &baton);
16500 SYMBOL_LOCATION_BATON (sym) = baton;
16501 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16503 else if (bytes != NULL)
16505 SYMBOL_VALUE_BYTES (sym) = bytes;
16506 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
16510 SYMBOL_VALUE (sym) = value;
16511 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
16515 /* Return the type of the die in question using its DW_AT_type attribute. */
16517 static struct type *
16518 die_type (struct die_info *die, struct dwarf2_cu *cu)
16520 struct attribute *type_attr;
16522 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16525 /* A missing DW_AT_type represents a void type. */
16526 return objfile_type (cu->objfile)->builtin_void;
16529 return lookup_die_type (die, type_attr, cu);
16532 /* True iff CU's producer generates GNAT Ada auxiliary information
16533 that allows to find parallel types through that information instead
16534 of having to do expensive parallel lookups by type name. */
16537 need_gnat_info (struct dwarf2_cu *cu)
16539 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16540 of GNAT produces this auxiliary information, without any indication
16541 that it is produced. Part of enhancing the FSF version of GNAT
16542 to produce that information will be to put in place an indicator
16543 that we can use in order to determine whether the descriptive type
16544 info is available or not. One suggestion that has been made is
16545 to use a new attribute, attached to the CU die. For now, assume
16546 that the descriptive type info is not available. */
16550 /* Return the auxiliary type of the die in question using its
16551 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16552 attribute is not present. */
16554 static struct type *
16555 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16557 struct attribute *type_attr;
16559 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
16563 return lookup_die_type (die, type_attr, cu);
16566 /* If DIE has a descriptive_type attribute, then set the TYPE's
16567 descriptive type accordingly. */
16570 set_descriptive_type (struct type *type, struct die_info *die,
16571 struct dwarf2_cu *cu)
16573 struct type *descriptive_type = die_descriptive_type (die, cu);
16575 if (descriptive_type)
16577 ALLOCATE_GNAT_AUX_TYPE (type);
16578 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
16582 /* Return the containing type of the die in question using its
16583 DW_AT_containing_type attribute. */
16585 static struct type *
16586 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
16588 struct attribute *type_attr;
16590 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
16592 error (_("Dwarf Error: Problem turning containing type into gdb type "
16593 "[in module %s]"), cu->objfile->name);
16595 return lookup_die_type (die, type_attr, cu);
16598 /* Look up the type of DIE in CU using its type attribute ATTR.
16599 If there is no type substitute an error marker. */
16601 static struct type *
16602 lookup_die_type (struct die_info *die, struct attribute *attr,
16603 struct dwarf2_cu *cu)
16605 struct objfile *objfile = cu->objfile;
16606 struct type *this_type;
16608 /* First see if we have it cached. */
16610 if (attr->form == DW_FORM_GNU_ref_alt)
16612 struct dwarf2_per_cu_data *per_cu;
16613 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16615 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
16616 this_type = get_die_type_at_offset (offset, per_cu);
16618 else if (is_ref_attr (attr))
16620 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16622 this_type = get_die_type_at_offset (offset, cu->per_cu);
16624 else if (attr->form == DW_FORM_ref_sig8)
16626 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr);
16628 /* sig_type will be NULL if the signatured type is missing from
16630 if (sig_type == NULL)
16631 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE "
16632 "at 0x%x [in module %s]"),
16633 die->offset.sect_off, objfile->name);
16635 gdb_assert (sig_type->per_cu.is_debug_types);
16636 /* If we haven't filled in type_offset_in_section yet, then we
16637 haven't read the type in yet. */
16639 if (sig_type->type_offset_in_section.sect_off != 0)
16642 get_die_type_at_offset (sig_type->type_offset_in_section,
16643 &sig_type->per_cu);
16648 dump_die_for_error (die);
16649 error (_("Dwarf Error: Bad type attribute %s [in module %s]"),
16650 dwarf_attr_name (attr->name), objfile->name);
16653 /* If not cached we need to read it in. */
16655 if (this_type == NULL)
16657 struct die_info *type_die;
16658 struct dwarf2_cu *type_cu = cu;
16660 type_die = follow_die_ref_or_sig (die, attr, &type_cu);
16661 /* If we found the type now, it's probably because the type came
16662 from an inter-CU reference and the type's CU got expanded before
16664 this_type = get_die_type (type_die, type_cu);
16665 if (this_type == NULL)
16666 this_type = read_type_die_1 (type_die, type_cu);
16669 /* If we still don't have a type use an error marker. */
16671 if (this_type == NULL)
16673 char *message, *saved;
16675 /* read_type_die already issued a complaint. */
16676 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
16678 cu->header.offset.sect_off,
16679 die->offset.sect_off);
16680 saved = obstack_copy0 (&objfile->objfile_obstack,
16681 message, strlen (message));
16684 this_type = init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
16690 /* Return the type in DIE, CU.
16691 Returns NULL for invalid types.
16693 This first does a lookup in die_type_hash,
16694 and only reads the die in if necessary.
16696 NOTE: This can be called when reading in partial or full symbols. */
16698 static struct type *
16699 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
16701 struct type *this_type;
16703 this_type = get_die_type (die, cu);
16707 return read_type_die_1 (die, cu);
16710 /* Read the type in DIE, CU.
16711 Returns NULL for invalid types. */
16713 static struct type *
16714 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
16716 struct type *this_type = NULL;
16720 case DW_TAG_class_type:
16721 case DW_TAG_interface_type:
16722 case DW_TAG_structure_type:
16723 case DW_TAG_union_type:
16724 this_type = read_structure_type (die, cu);
16726 case DW_TAG_enumeration_type:
16727 this_type = read_enumeration_type (die, cu);
16729 case DW_TAG_subprogram:
16730 case DW_TAG_subroutine_type:
16731 case DW_TAG_inlined_subroutine:
16732 this_type = read_subroutine_type (die, cu);
16734 case DW_TAG_array_type:
16735 this_type = read_array_type (die, cu);
16737 case DW_TAG_set_type:
16738 this_type = read_set_type (die, cu);
16740 case DW_TAG_pointer_type:
16741 this_type = read_tag_pointer_type (die, cu);
16743 case DW_TAG_ptr_to_member_type:
16744 this_type = read_tag_ptr_to_member_type (die, cu);
16746 case DW_TAG_reference_type:
16747 this_type = read_tag_reference_type (die, cu);
16749 case DW_TAG_const_type:
16750 this_type = read_tag_const_type (die, cu);
16752 case DW_TAG_volatile_type:
16753 this_type = read_tag_volatile_type (die, cu);
16755 case DW_TAG_restrict_type:
16756 this_type = read_tag_restrict_type (die, cu);
16758 case DW_TAG_string_type:
16759 this_type = read_tag_string_type (die, cu);
16761 case DW_TAG_typedef:
16762 this_type = read_typedef (die, cu);
16764 case DW_TAG_subrange_type:
16765 this_type = read_subrange_type (die, cu);
16767 case DW_TAG_base_type:
16768 this_type = read_base_type (die, cu);
16770 case DW_TAG_unspecified_type:
16771 this_type = read_unspecified_type (die, cu);
16773 case DW_TAG_namespace:
16774 this_type = read_namespace_type (die, cu);
16776 case DW_TAG_module:
16777 this_type = read_module_type (die, cu);
16780 complaint (&symfile_complaints,
16781 _("unexpected tag in read_type_die: '%s'"),
16782 dwarf_tag_name (die->tag));
16789 /* See if we can figure out if the class lives in a namespace. We do
16790 this by looking for a member function; its demangled name will
16791 contain namespace info, if there is any.
16792 Return the computed name or NULL.
16793 Space for the result is allocated on the objfile's obstack.
16794 This is the full-die version of guess_partial_die_structure_name.
16795 In this case we know DIE has no useful parent. */
16798 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
16800 struct die_info *spec_die;
16801 struct dwarf2_cu *spec_cu;
16802 struct die_info *child;
16805 spec_die = die_specification (die, &spec_cu);
16806 if (spec_die != NULL)
16812 for (child = die->child;
16814 child = child->sibling)
16816 if (child->tag == DW_TAG_subprogram)
16818 struct attribute *attr;
16820 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
16822 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
16826 = language_class_name_from_physname (cu->language_defn,
16830 if (actual_name != NULL)
16832 const char *die_name = dwarf2_name (die, cu);
16834 if (die_name != NULL
16835 && strcmp (die_name, actual_name) != 0)
16837 /* Strip off the class name from the full name.
16838 We want the prefix. */
16839 int die_name_len = strlen (die_name);
16840 int actual_name_len = strlen (actual_name);
16842 /* Test for '::' as a sanity check. */
16843 if (actual_name_len > die_name_len + 2
16844 && actual_name[actual_name_len
16845 - die_name_len - 1] == ':')
16847 obstack_copy0 (&cu->objfile->objfile_obstack,
16849 actual_name_len - die_name_len - 2);
16852 xfree (actual_name);
16861 /* GCC might emit a nameless typedef that has a linkage name. Determine the
16862 prefix part in such case. See
16863 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16866 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
16868 struct attribute *attr;
16871 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
16872 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
16875 attr = dwarf2_attr (die, DW_AT_name, cu);
16876 if (attr != NULL && DW_STRING (attr) != NULL)
16879 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
16881 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
16882 if (attr == NULL || DW_STRING (attr) == NULL)
16885 /* dwarf2_name had to be already called. */
16886 gdb_assert (DW_STRING_IS_CANONICAL (attr));
16888 /* Strip the base name, keep any leading namespaces/classes. */
16889 base = strrchr (DW_STRING (attr), ':');
16890 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
16893 return obstack_copy0 (&cu->objfile->objfile_obstack,
16894 DW_STRING (attr), &base[-1] - DW_STRING (attr));
16897 /* Return the name of the namespace/class that DIE is defined within,
16898 or "" if we can't tell. The caller should not xfree the result.
16900 For example, if we're within the method foo() in the following
16910 then determine_prefix on foo's die will return "N::C". */
16912 static const char *
16913 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
16915 struct die_info *parent, *spec_die;
16916 struct dwarf2_cu *spec_cu;
16917 struct type *parent_type;
16920 if (cu->language != language_cplus && cu->language != language_java
16921 && cu->language != language_fortran)
16924 retval = anonymous_struct_prefix (die, cu);
16928 /* We have to be careful in the presence of DW_AT_specification.
16929 For example, with GCC 3.4, given the code
16933 // Definition of N::foo.
16937 then we'll have a tree of DIEs like this:
16939 1: DW_TAG_compile_unit
16940 2: DW_TAG_namespace // N
16941 3: DW_TAG_subprogram // declaration of N::foo
16942 4: DW_TAG_subprogram // definition of N::foo
16943 DW_AT_specification // refers to die #3
16945 Thus, when processing die #4, we have to pretend that we're in
16946 the context of its DW_AT_specification, namely the contex of die
16949 spec_die = die_specification (die, &spec_cu);
16950 if (spec_die == NULL)
16951 parent = die->parent;
16954 parent = spec_die->parent;
16958 if (parent == NULL)
16960 else if (parent->building_fullname)
16963 const char *parent_name;
16965 /* It has been seen on RealView 2.2 built binaries,
16966 DW_TAG_template_type_param types actually _defined_ as
16967 children of the parent class:
16970 template class <class Enum> Class{};
16971 Class<enum E> class_e;
16973 1: DW_TAG_class_type (Class)
16974 2: DW_TAG_enumeration_type (E)
16975 3: DW_TAG_enumerator (enum1:0)
16976 3: DW_TAG_enumerator (enum2:1)
16978 2: DW_TAG_template_type_param
16979 DW_AT_type DW_FORM_ref_udata (E)
16981 Besides being broken debug info, it can put GDB into an
16982 infinite loop. Consider:
16984 When we're building the full name for Class<E>, we'll start
16985 at Class, and go look over its template type parameters,
16986 finding E. We'll then try to build the full name of E, and
16987 reach here. We're now trying to build the full name of E,
16988 and look over the parent DIE for containing scope. In the
16989 broken case, if we followed the parent DIE of E, we'd again
16990 find Class, and once again go look at its template type
16991 arguments, etc., etc. Simply don't consider such parent die
16992 as source-level parent of this die (it can't be, the language
16993 doesn't allow it), and break the loop here. */
16994 name = dwarf2_name (die, cu);
16995 parent_name = dwarf2_name (parent, cu);
16996 complaint (&symfile_complaints,
16997 _("template param type '%s' defined within parent '%s'"),
16998 name ? name : "<unknown>",
16999 parent_name ? parent_name : "<unknown>");
17003 switch (parent->tag)
17005 case DW_TAG_namespace:
17006 parent_type = read_type_die (parent, cu);
17007 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17008 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17009 Work around this problem here. */
17010 if (cu->language == language_cplus
17011 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17013 /* We give a name to even anonymous namespaces. */
17014 return TYPE_TAG_NAME (parent_type);
17015 case DW_TAG_class_type:
17016 case DW_TAG_interface_type:
17017 case DW_TAG_structure_type:
17018 case DW_TAG_union_type:
17019 case DW_TAG_module:
17020 parent_type = read_type_die (parent, cu);
17021 if (TYPE_TAG_NAME (parent_type) != NULL)
17022 return TYPE_TAG_NAME (parent_type);
17024 /* An anonymous structure is only allowed non-static data
17025 members; no typedefs, no member functions, et cetera.
17026 So it does not need a prefix. */
17028 case DW_TAG_compile_unit:
17029 case DW_TAG_partial_unit:
17030 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17031 if (cu->language == language_cplus
17032 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17033 && die->child != NULL
17034 && (die->tag == DW_TAG_class_type
17035 || die->tag == DW_TAG_structure_type
17036 || die->tag == DW_TAG_union_type))
17038 char *name = guess_full_die_structure_name (die, cu);
17044 return determine_prefix (parent, cu);
17048 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17049 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17050 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17051 an obconcat, otherwise allocate storage for the result. The CU argument is
17052 used to determine the language and hence, the appropriate separator. */
17054 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17057 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17058 int physname, struct dwarf2_cu *cu)
17060 const char *lead = "";
17063 if (suffix == NULL || suffix[0] == '\0'
17064 || prefix == NULL || prefix[0] == '\0')
17066 else if (cu->language == language_java)
17068 else if (cu->language == language_fortran && physname)
17070 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17071 DW_AT_MIPS_linkage_name is preferred and used instead. */
17079 if (prefix == NULL)
17081 if (suffix == NULL)
17087 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17089 strcpy (retval, lead);
17090 strcat (retval, prefix);
17091 strcat (retval, sep);
17092 strcat (retval, suffix);
17097 /* We have an obstack. */
17098 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17102 /* Return sibling of die, NULL if no sibling. */
17104 static struct die_info *
17105 sibling_die (struct die_info *die)
17107 return die->sibling;
17110 /* Get name of a die, return NULL if not found. */
17112 static const char *
17113 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17114 struct obstack *obstack)
17116 if (name && cu->language == language_cplus)
17118 char *canon_name = cp_canonicalize_string (name);
17120 if (canon_name != NULL)
17122 if (strcmp (canon_name, name) != 0)
17123 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17124 xfree (canon_name);
17131 /* Get name of a die, return NULL if not found. */
17133 static const char *
17134 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17136 struct attribute *attr;
17138 attr = dwarf2_attr (die, DW_AT_name, cu);
17139 if ((!attr || !DW_STRING (attr))
17140 && die->tag != DW_TAG_class_type
17141 && die->tag != DW_TAG_interface_type
17142 && die->tag != DW_TAG_structure_type
17143 && die->tag != DW_TAG_union_type)
17148 case DW_TAG_compile_unit:
17149 case DW_TAG_partial_unit:
17150 /* Compilation units have a DW_AT_name that is a filename, not
17151 a source language identifier. */
17152 case DW_TAG_enumeration_type:
17153 case DW_TAG_enumerator:
17154 /* These tags always have simple identifiers already; no need
17155 to canonicalize them. */
17156 return DW_STRING (attr);
17158 case DW_TAG_subprogram:
17159 /* Java constructors will all be named "<init>", so return
17160 the class name when we see this special case. */
17161 if (cu->language == language_java
17162 && DW_STRING (attr) != NULL
17163 && strcmp (DW_STRING (attr), "<init>") == 0)
17165 struct dwarf2_cu *spec_cu = cu;
17166 struct die_info *spec_die;
17168 /* GCJ will output '<init>' for Java constructor names.
17169 For this special case, return the name of the parent class. */
17171 /* GCJ may output suprogram DIEs with AT_specification set.
17172 If so, use the name of the specified DIE. */
17173 spec_die = die_specification (die, &spec_cu);
17174 if (spec_die != NULL)
17175 return dwarf2_name (spec_die, spec_cu);
17180 if (die->tag == DW_TAG_class_type)
17181 return dwarf2_name (die, cu);
17183 while (die->tag != DW_TAG_compile_unit
17184 && die->tag != DW_TAG_partial_unit);
17188 case DW_TAG_class_type:
17189 case DW_TAG_interface_type:
17190 case DW_TAG_structure_type:
17191 case DW_TAG_union_type:
17192 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17193 structures or unions. These were of the form "._%d" in GCC 4.1,
17194 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17195 and GCC 4.4. We work around this problem by ignoring these. */
17196 if (attr && DW_STRING (attr)
17197 && (strncmp (DW_STRING (attr), "._", 2) == 0
17198 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17201 /* GCC might emit a nameless typedef that has a linkage name. See
17202 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17203 if (!attr || DW_STRING (attr) == NULL)
17205 char *demangled = NULL;
17207 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17209 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17211 if (attr == NULL || DW_STRING (attr) == NULL)
17214 /* Avoid demangling DW_STRING (attr) the second time on a second
17215 call for the same DIE. */
17216 if (!DW_STRING_IS_CANONICAL (attr))
17217 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17223 /* FIXME: we already did this for the partial symbol... */
17224 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17225 demangled, strlen (demangled));
17226 DW_STRING_IS_CANONICAL (attr) = 1;
17229 /* Strip any leading namespaces/classes, keep only the base name.
17230 DW_AT_name for named DIEs does not contain the prefixes. */
17231 base = strrchr (DW_STRING (attr), ':');
17232 if (base && base > DW_STRING (attr) && base[-1] == ':')
17235 return DW_STRING (attr);
17244 if (!DW_STRING_IS_CANONICAL (attr))
17247 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17248 &cu->objfile->objfile_obstack);
17249 DW_STRING_IS_CANONICAL (attr) = 1;
17251 return DW_STRING (attr);
17254 /* Return the die that this die in an extension of, or NULL if there
17255 is none. *EXT_CU is the CU containing DIE on input, and the CU
17256 containing the return value on output. */
17258 static struct die_info *
17259 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17261 struct attribute *attr;
17263 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17267 return follow_die_ref (die, attr, ext_cu);
17270 /* Convert a DIE tag into its string name. */
17272 static const char *
17273 dwarf_tag_name (unsigned tag)
17275 const char *name = get_DW_TAG_name (tag);
17278 return "DW_TAG_<unknown>";
17283 /* Convert a DWARF attribute code into its string name. */
17285 static const char *
17286 dwarf_attr_name (unsigned attr)
17290 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17291 if (attr == DW_AT_MIPS_fde)
17292 return "DW_AT_MIPS_fde";
17294 if (attr == DW_AT_HP_block_index)
17295 return "DW_AT_HP_block_index";
17298 name = get_DW_AT_name (attr);
17301 return "DW_AT_<unknown>";
17306 /* Convert a DWARF value form code into its string name. */
17308 static const char *
17309 dwarf_form_name (unsigned form)
17311 const char *name = get_DW_FORM_name (form);
17314 return "DW_FORM_<unknown>";
17320 dwarf_bool_name (unsigned mybool)
17328 /* Convert a DWARF type code into its string name. */
17330 static const char *
17331 dwarf_type_encoding_name (unsigned enc)
17333 const char *name = get_DW_ATE_name (enc);
17336 return "DW_ATE_<unknown>";
17342 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17346 print_spaces (indent, f);
17347 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17348 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17350 if (die->parent != NULL)
17352 print_spaces (indent, f);
17353 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17354 die->parent->offset.sect_off);
17357 print_spaces (indent, f);
17358 fprintf_unfiltered (f, " has children: %s\n",
17359 dwarf_bool_name (die->child != NULL));
17361 print_spaces (indent, f);
17362 fprintf_unfiltered (f, " attributes:\n");
17364 for (i = 0; i < die->num_attrs; ++i)
17366 print_spaces (indent, f);
17367 fprintf_unfiltered (f, " %s (%s) ",
17368 dwarf_attr_name (die->attrs[i].name),
17369 dwarf_form_name (die->attrs[i].form));
17371 switch (die->attrs[i].form)
17374 case DW_FORM_GNU_addr_index:
17375 fprintf_unfiltered (f, "address: ");
17376 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17378 case DW_FORM_block2:
17379 case DW_FORM_block4:
17380 case DW_FORM_block:
17381 case DW_FORM_block1:
17382 fprintf_unfiltered (f, "block: size %s",
17383 pulongest (DW_BLOCK (&die->attrs[i])->size));
17385 case DW_FORM_exprloc:
17386 fprintf_unfiltered (f, "expression: size %s",
17387 pulongest (DW_BLOCK (&die->attrs[i])->size));
17389 case DW_FORM_ref_addr:
17390 fprintf_unfiltered (f, "ref address: ");
17391 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17393 case DW_FORM_GNU_ref_alt:
17394 fprintf_unfiltered (f, "alt ref address: ");
17395 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17401 case DW_FORM_ref_udata:
17402 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17403 (long) (DW_UNSND (&die->attrs[i])));
17405 case DW_FORM_data1:
17406 case DW_FORM_data2:
17407 case DW_FORM_data4:
17408 case DW_FORM_data8:
17409 case DW_FORM_udata:
17410 case DW_FORM_sdata:
17411 fprintf_unfiltered (f, "constant: %s",
17412 pulongest (DW_UNSND (&die->attrs[i])));
17414 case DW_FORM_sec_offset:
17415 fprintf_unfiltered (f, "section offset: %s",
17416 pulongest (DW_UNSND (&die->attrs[i])));
17418 case DW_FORM_ref_sig8:
17419 if (DW_SIGNATURED_TYPE (&die->attrs[i]) != NULL)
17421 struct signatured_type *sig_type =
17422 DW_SIGNATURED_TYPE (&die->attrs[i]);
17424 fprintf_unfiltered (f, "signatured type: 0x%s, offset 0x%x",
17425 hex_string (sig_type->signature),
17426 sig_type->per_cu.offset.sect_off);
17429 fprintf_unfiltered (f, "signatured type, unknown");
17431 case DW_FORM_string:
17433 case DW_FORM_GNU_str_index:
17434 case DW_FORM_GNU_strp_alt:
17435 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17436 DW_STRING (&die->attrs[i])
17437 ? DW_STRING (&die->attrs[i]) : "",
17438 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17441 if (DW_UNSND (&die->attrs[i]))
17442 fprintf_unfiltered (f, "flag: TRUE");
17444 fprintf_unfiltered (f, "flag: FALSE");
17446 case DW_FORM_flag_present:
17447 fprintf_unfiltered (f, "flag: TRUE");
17449 case DW_FORM_indirect:
17450 /* The reader will have reduced the indirect form to
17451 the "base form" so this form should not occur. */
17452 fprintf_unfiltered (f,
17453 "unexpected attribute form: DW_FORM_indirect");
17456 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17457 die->attrs[i].form);
17460 fprintf_unfiltered (f, "\n");
17465 dump_die_for_error (struct die_info *die)
17467 dump_die_shallow (gdb_stderr, 0, die);
17471 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17473 int indent = level * 4;
17475 gdb_assert (die != NULL);
17477 if (level >= max_level)
17480 dump_die_shallow (f, indent, die);
17482 if (die->child != NULL)
17484 print_spaces (indent, f);
17485 fprintf_unfiltered (f, " Children:");
17486 if (level + 1 < max_level)
17488 fprintf_unfiltered (f, "\n");
17489 dump_die_1 (f, level + 1, max_level, die->child);
17493 fprintf_unfiltered (f,
17494 " [not printed, max nesting level reached]\n");
17498 if (die->sibling != NULL && level > 0)
17500 dump_die_1 (f, level, max_level, die->sibling);
17504 /* This is called from the pdie macro in gdbinit.in.
17505 It's not static so gcc will keep a copy callable from gdb. */
17508 dump_die (struct die_info *die, int max_level)
17510 dump_die_1 (gdb_stdlog, 0, max_level, die);
17514 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17518 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17524 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17525 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17528 is_ref_attr (struct attribute *attr)
17530 switch (attr->form)
17532 case DW_FORM_ref_addr:
17537 case DW_FORM_ref_udata:
17538 case DW_FORM_GNU_ref_alt:
17545 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17549 dwarf2_get_ref_die_offset (struct attribute *attr)
17551 sect_offset retval = { DW_UNSND (attr) };
17553 if (is_ref_attr (attr))
17556 retval.sect_off = 0;
17557 complaint (&symfile_complaints,
17558 _("unsupported die ref attribute form: '%s'"),
17559 dwarf_form_name (attr->form));
17563 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17564 * the value held by the attribute is not constant. */
17567 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17569 if (attr->form == DW_FORM_sdata)
17570 return DW_SND (attr);
17571 else if (attr->form == DW_FORM_udata
17572 || attr->form == DW_FORM_data1
17573 || attr->form == DW_FORM_data2
17574 || attr->form == DW_FORM_data4
17575 || attr->form == DW_FORM_data8)
17576 return DW_UNSND (attr);
17579 complaint (&symfile_complaints,
17580 _("Attribute value is not a constant (%s)"),
17581 dwarf_form_name (attr->form));
17582 return default_value;
17586 /* Follow reference or signature attribute ATTR of SRC_DIE.
17587 On entry *REF_CU is the CU of SRC_DIE.
17588 On exit *REF_CU is the CU of the result. */
17590 static struct die_info *
17591 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
17592 struct dwarf2_cu **ref_cu)
17594 struct die_info *die;
17596 if (is_ref_attr (attr))
17597 die = follow_die_ref (src_die, attr, ref_cu);
17598 else if (attr->form == DW_FORM_ref_sig8)
17599 die = follow_die_sig (src_die, attr, ref_cu);
17602 dump_die_for_error (src_die);
17603 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
17604 (*ref_cu)->objfile->name);
17610 /* Follow reference OFFSET.
17611 On entry *REF_CU is the CU of the source die referencing OFFSET.
17612 On exit *REF_CU is the CU of the result.
17613 Returns NULL if OFFSET is invalid. */
17615 static struct die_info *
17616 follow_die_offset (sect_offset offset, int offset_in_dwz,
17617 struct dwarf2_cu **ref_cu)
17619 struct die_info temp_die;
17620 struct dwarf2_cu *target_cu, *cu = *ref_cu;
17622 gdb_assert (cu->per_cu != NULL);
17626 if (cu->per_cu->is_debug_types)
17628 /* .debug_types CUs cannot reference anything outside their CU.
17629 If they need to, they have to reference a signatured type via
17630 DW_FORM_ref_sig8. */
17631 if (! offset_in_cu_p (&cu->header, offset))
17634 else if (offset_in_dwz != cu->per_cu->is_dwz
17635 || ! offset_in_cu_p (&cu->header, offset))
17637 struct dwarf2_per_cu_data *per_cu;
17639 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
17642 /* If necessary, add it to the queue and load its DIEs. */
17643 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
17644 load_full_comp_unit (per_cu, cu->language);
17646 target_cu = per_cu->cu;
17648 else if (cu->dies == NULL)
17650 /* We're loading full DIEs during partial symbol reading. */
17651 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
17652 load_full_comp_unit (cu->per_cu, language_minimal);
17655 *ref_cu = target_cu;
17656 temp_die.offset = offset;
17657 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
17660 /* Follow reference attribute ATTR of SRC_DIE.
17661 On entry *REF_CU is the CU of SRC_DIE.
17662 On exit *REF_CU is the CU of the result. */
17664 static struct die_info *
17665 follow_die_ref (struct die_info *src_die, struct attribute *attr,
17666 struct dwarf2_cu **ref_cu)
17668 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17669 struct dwarf2_cu *cu = *ref_cu;
17670 struct die_info *die;
17672 die = follow_die_offset (offset,
17673 (attr->form == DW_FORM_GNU_ref_alt
17674 || cu->per_cu->is_dwz),
17677 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
17678 "at 0x%x [in module %s]"),
17679 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
17684 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
17685 Returned value is intended for DW_OP_call*. Returned
17686 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
17688 struct dwarf2_locexpr_baton
17689 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
17690 struct dwarf2_per_cu_data *per_cu,
17691 CORE_ADDR (*get_frame_pc) (void *baton),
17694 struct dwarf2_cu *cu;
17695 struct die_info *die;
17696 struct attribute *attr;
17697 struct dwarf2_locexpr_baton retval;
17699 dw2_setup (per_cu->objfile);
17701 if (per_cu->cu == NULL)
17705 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
17707 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
17708 offset.sect_off, per_cu->objfile->name);
17710 attr = dwarf2_attr (die, DW_AT_location, cu);
17713 /* DWARF: "If there is no such attribute, then there is no effect.".
17714 DATA is ignored if SIZE is 0. */
17716 retval.data = NULL;
17719 else if (attr_form_is_section_offset (attr))
17721 struct dwarf2_loclist_baton loclist_baton;
17722 CORE_ADDR pc = (*get_frame_pc) (baton);
17725 fill_in_loclist_baton (cu, &loclist_baton, attr);
17727 retval.data = dwarf2_find_location_expression (&loclist_baton,
17729 retval.size = size;
17733 if (!attr_form_is_block (attr))
17734 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
17735 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
17736 offset.sect_off, per_cu->objfile->name);
17738 retval.data = DW_BLOCK (attr)->data;
17739 retval.size = DW_BLOCK (attr)->size;
17741 retval.per_cu = cu->per_cu;
17743 age_cached_comp_units ();
17748 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
17751 struct dwarf2_locexpr_baton
17752 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
17753 struct dwarf2_per_cu_data *per_cu,
17754 CORE_ADDR (*get_frame_pc) (void *baton),
17757 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
17759 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
17762 /* Return the type of the DIE at DIE_OFFSET in the CU named by
17766 dwarf2_get_die_type (cu_offset die_offset,
17767 struct dwarf2_per_cu_data *per_cu)
17769 sect_offset die_offset_sect;
17771 dw2_setup (per_cu->objfile);
17773 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
17774 return get_die_type_at_offset (die_offset_sect, per_cu);
17777 /* Follow the signature attribute ATTR in SRC_DIE.
17778 On entry *REF_CU is the CU of SRC_DIE.
17779 On exit *REF_CU is the CU of the result. */
17781 static struct die_info *
17782 follow_die_sig (struct die_info *src_die, struct attribute *attr,
17783 struct dwarf2_cu **ref_cu)
17785 struct objfile *objfile = (*ref_cu)->objfile;
17786 struct die_info temp_die;
17787 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr);
17788 struct dwarf2_cu *sig_cu;
17789 struct die_info *die;
17791 /* sig_type will be NULL if the signatured type is missing from
17793 if (sig_type == NULL)
17794 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE "
17795 "at 0x%x [in module %s]"),
17796 src_die->offset.sect_off, objfile->name);
17798 /* If necessary, add it to the queue and load its DIEs. */
17800 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
17801 read_signatured_type (sig_type);
17803 gdb_assert (sig_type->per_cu.cu != NULL);
17805 sig_cu = sig_type->per_cu.cu;
17806 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
17807 temp_die.offset = sig_type->type_offset_in_section;
17808 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
17809 temp_die.offset.sect_off);
17812 /* For .gdb_index version 7 keep track of included TUs.
17813 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
17814 if (dwarf2_per_objfile->index_table != NULL
17815 && dwarf2_per_objfile->index_table->version <= 7)
17817 VEC_safe_push (dwarf2_per_cu_ptr,
17818 (*ref_cu)->per_cu->imported_symtabs,
17826 error (_("Dwarf Error: Cannot find signatured DIE at 0x%x referenced "
17827 "from DIE at 0x%x [in module %s]"),
17828 temp_die.offset.sect_off, src_die->offset.sect_off, objfile->name);
17831 /* Load the DIEs associated with type unit PER_CU into memory. */
17834 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
17836 struct signatured_type *sig_type;
17838 /* Caller is responsible for ensuring type_unit_groups don't get here. */
17839 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
17841 /* We have the per_cu, but we need the signatured_type.
17842 Fortunately this is an easy translation. */
17843 gdb_assert (per_cu->is_debug_types);
17844 sig_type = (struct signatured_type *) per_cu;
17846 gdb_assert (per_cu->cu == NULL);
17848 read_signatured_type (sig_type);
17850 gdb_assert (per_cu->cu != NULL);
17853 /* die_reader_func for read_signatured_type.
17854 This is identical to load_full_comp_unit_reader,
17855 but is kept separate for now. */
17858 read_signatured_type_reader (const struct die_reader_specs *reader,
17859 const gdb_byte *info_ptr,
17860 struct die_info *comp_unit_die,
17864 struct dwarf2_cu *cu = reader->cu;
17866 gdb_assert (cu->die_hash == NULL);
17868 htab_create_alloc_ex (cu->header.length / 12,
17872 &cu->comp_unit_obstack,
17873 hashtab_obstack_allocate,
17874 dummy_obstack_deallocate);
17877 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
17878 &info_ptr, comp_unit_die);
17879 cu->dies = comp_unit_die;
17880 /* comp_unit_die is not stored in die_hash, no need. */
17882 /* We try not to read any attributes in this function, because not
17883 all CUs needed for references have been loaded yet, and symbol
17884 table processing isn't initialized. But we have to set the CU language,
17885 or we won't be able to build types correctly.
17886 Similarly, if we do not read the producer, we can not apply
17887 producer-specific interpretation. */
17888 prepare_one_comp_unit (cu, cu->dies, language_minimal);
17891 /* Read in a signatured type and build its CU and DIEs.
17892 If the type is a stub for the real type in a DWO file,
17893 read in the real type from the DWO file as well. */
17896 read_signatured_type (struct signatured_type *sig_type)
17898 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
17900 gdb_assert (per_cu->is_debug_types);
17901 gdb_assert (per_cu->cu == NULL);
17903 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
17904 read_signatured_type_reader, NULL);
17907 /* Decode simple location descriptions.
17908 Given a pointer to a dwarf block that defines a location, compute
17909 the location and return the value.
17911 NOTE drow/2003-11-18: This function is called in two situations
17912 now: for the address of static or global variables (partial symbols
17913 only) and for offsets into structures which are expected to be
17914 (more or less) constant. The partial symbol case should go away,
17915 and only the constant case should remain. That will let this
17916 function complain more accurately. A few special modes are allowed
17917 without complaint for global variables (for instance, global
17918 register values and thread-local values).
17920 A location description containing no operations indicates that the
17921 object is optimized out. The return value is 0 for that case.
17922 FIXME drow/2003-11-16: No callers check for this case any more; soon all
17923 callers will only want a very basic result and this can become a
17926 Note that stack[0] is unused except as a default error return. */
17929 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
17931 struct objfile *objfile = cu->objfile;
17933 size_t size = blk->size;
17934 const gdb_byte *data = blk->data;
17935 CORE_ADDR stack[64];
17937 unsigned int bytes_read, unsnd;
17943 stack[++stacki] = 0;
17982 stack[++stacki] = op - DW_OP_lit0;
18017 stack[++stacki] = op - DW_OP_reg0;
18019 dwarf2_complex_location_expr_complaint ();
18023 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18025 stack[++stacki] = unsnd;
18027 dwarf2_complex_location_expr_complaint ();
18031 stack[++stacki] = read_address (objfile->obfd, &data[i],
18036 case DW_OP_const1u:
18037 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18041 case DW_OP_const1s:
18042 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18046 case DW_OP_const2u:
18047 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18051 case DW_OP_const2s:
18052 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18056 case DW_OP_const4u:
18057 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18061 case DW_OP_const4s:
18062 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18066 case DW_OP_const8u:
18067 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18072 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18078 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18083 stack[stacki + 1] = stack[stacki];
18088 stack[stacki - 1] += stack[stacki];
18092 case DW_OP_plus_uconst:
18093 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18099 stack[stacki - 1] -= stack[stacki];
18104 /* If we're not the last op, then we definitely can't encode
18105 this using GDB's address_class enum. This is valid for partial
18106 global symbols, although the variable's address will be bogus
18109 dwarf2_complex_location_expr_complaint ();
18112 case DW_OP_GNU_push_tls_address:
18113 /* The top of the stack has the offset from the beginning
18114 of the thread control block at which the variable is located. */
18115 /* Nothing should follow this operator, so the top of stack would
18117 /* This is valid for partial global symbols, but the variable's
18118 address will be bogus in the psymtab. Make it always at least
18119 non-zero to not look as a variable garbage collected by linker
18120 which have DW_OP_addr 0. */
18122 dwarf2_complex_location_expr_complaint ();
18126 case DW_OP_GNU_uninit:
18129 case DW_OP_GNU_addr_index:
18130 case DW_OP_GNU_const_index:
18131 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18138 const char *name = get_DW_OP_name (op);
18141 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18144 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18148 return (stack[stacki]);
18151 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18152 outside of the allocated space. Also enforce minimum>0. */
18153 if (stacki >= ARRAY_SIZE (stack) - 1)
18155 complaint (&symfile_complaints,
18156 _("location description stack overflow"));
18162 complaint (&symfile_complaints,
18163 _("location description stack underflow"));
18167 return (stack[stacki]);
18170 /* memory allocation interface */
18172 static struct dwarf_block *
18173 dwarf_alloc_block (struct dwarf2_cu *cu)
18175 struct dwarf_block *blk;
18177 blk = (struct dwarf_block *)
18178 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18182 static struct die_info *
18183 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18185 struct die_info *die;
18186 size_t size = sizeof (struct die_info);
18189 size += (num_attrs - 1) * sizeof (struct attribute);
18191 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18192 memset (die, 0, sizeof (struct die_info));
18197 /* Macro support. */
18199 /* Return file name relative to the compilation directory of file number I in
18200 *LH's file name table. The result is allocated using xmalloc; the caller is
18201 responsible for freeing it. */
18204 file_file_name (int file, struct line_header *lh)
18206 /* Is the file number a valid index into the line header's file name
18207 table? Remember that file numbers start with one, not zero. */
18208 if (1 <= file && file <= lh->num_file_names)
18210 struct file_entry *fe = &lh->file_names[file - 1];
18212 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18213 return xstrdup (fe->name);
18214 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18219 /* The compiler produced a bogus file number. We can at least
18220 record the macro definitions made in the file, even if we
18221 won't be able to find the file by name. */
18222 char fake_name[80];
18224 xsnprintf (fake_name, sizeof (fake_name),
18225 "<bad macro file number %d>", file);
18227 complaint (&symfile_complaints,
18228 _("bad file number in macro information (%d)"),
18231 return xstrdup (fake_name);
18235 /* Return the full name of file number I in *LH's file name table.
18236 Use COMP_DIR as the name of the current directory of the
18237 compilation. The result is allocated using xmalloc; the caller is
18238 responsible for freeing it. */
18240 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18242 /* Is the file number a valid index into the line header's file name
18243 table? Remember that file numbers start with one, not zero. */
18244 if (1 <= file && file <= lh->num_file_names)
18246 char *relative = file_file_name (file, lh);
18248 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18250 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18253 return file_file_name (file, lh);
18257 static struct macro_source_file *
18258 macro_start_file (int file, int line,
18259 struct macro_source_file *current_file,
18260 const char *comp_dir,
18261 struct line_header *lh, struct objfile *objfile)
18263 /* File name relative to the compilation directory of this source file. */
18264 char *file_name = file_file_name (file, lh);
18266 /* We don't create a macro table for this compilation unit
18267 at all until we actually get a filename. */
18268 if (! pending_macros)
18269 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18270 objfile->per_bfd->macro_cache,
18273 if (! current_file)
18275 /* If we have no current file, then this must be the start_file
18276 directive for the compilation unit's main source file. */
18277 current_file = macro_set_main (pending_macros, file_name);
18278 macro_define_special (pending_macros);
18281 current_file = macro_include (current_file, line, file_name);
18285 return current_file;
18289 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18290 followed by a null byte. */
18292 copy_string (const char *buf, int len)
18294 char *s = xmalloc (len + 1);
18296 memcpy (s, buf, len);
18302 static const char *
18303 consume_improper_spaces (const char *p, const char *body)
18307 complaint (&symfile_complaints,
18308 _("macro definition contains spaces "
18309 "in formal argument list:\n`%s'"),
18321 parse_macro_definition (struct macro_source_file *file, int line,
18326 /* The body string takes one of two forms. For object-like macro
18327 definitions, it should be:
18329 <macro name> " " <definition>
18331 For function-like macro definitions, it should be:
18333 <macro name> "() " <definition>
18335 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
18337 Spaces may appear only where explicitly indicated, and in the
18340 The Dwarf 2 spec says that an object-like macro's name is always
18341 followed by a space, but versions of GCC around March 2002 omit
18342 the space when the macro's definition is the empty string.
18344 The Dwarf 2 spec says that there should be no spaces between the
18345 formal arguments in a function-like macro's formal argument list,
18346 but versions of GCC around March 2002 include spaces after the
18350 /* Find the extent of the macro name. The macro name is terminated
18351 by either a space or null character (for an object-like macro) or
18352 an opening paren (for a function-like macro). */
18353 for (p = body; *p; p++)
18354 if (*p == ' ' || *p == '(')
18357 if (*p == ' ' || *p == '\0')
18359 /* It's an object-like macro. */
18360 int name_len = p - body;
18361 char *name = copy_string (body, name_len);
18362 const char *replacement;
18365 replacement = body + name_len + 1;
18368 dwarf2_macro_malformed_definition_complaint (body);
18369 replacement = body + name_len;
18372 macro_define_object (file, line, name, replacement);
18376 else if (*p == '(')
18378 /* It's a function-like macro. */
18379 char *name = copy_string (body, p - body);
18382 char **argv = xmalloc (argv_size * sizeof (*argv));
18386 p = consume_improper_spaces (p, body);
18388 /* Parse the formal argument list. */
18389 while (*p && *p != ')')
18391 /* Find the extent of the current argument name. */
18392 const char *arg_start = p;
18394 while (*p && *p != ',' && *p != ')' && *p != ' ')
18397 if (! *p || p == arg_start)
18398 dwarf2_macro_malformed_definition_complaint (body);
18401 /* Make sure argv has room for the new argument. */
18402 if (argc >= argv_size)
18405 argv = xrealloc (argv, argv_size * sizeof (*argv));
18408 argv[argc++] = copy_string (arg_start, p - arg_start);
18411 p = consume_improper_spaces (p, body);
18413 /* Consume the comma, if present. */
18418 p = consume_improper_spaces (p, body);
18427 /* Perfectly formed definition, no complaints. */
18428 macro_define_function (file, line, name,
18429 argc, (const char **) argv,
18431 else if (*p == '\0')
18433 /* Complain, but do define it. */
18434 dwarf2_macro_malformed_definition_complaint (body);
18435 macro_define_function (file, line, name,
18436 argc, (const char **) argv,
18440 /* Just complain. */
18441 dwarf2_macro_malformed_definition_complaint (body);
18444 /* Just complain. */
18445 dwarf2_macro_malformed_definition_complaint (body);
18451 for (i = 0; i < argc; i++)
18457 dwarf2_macro_malformed_definition_complaint (body);
18460 /* Skip some bytes from BYTES according to the form given in FORM.
18461 Returns the new pointer. */
18463 static const gdb_byte *
18464 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
18465 enum dwarf_form form,
18466 unsigned int offset_size,
18467 struct dwarf2_section_info *section)
18469 unsigned int bytes_read;
18473 case DW_FORM_data1:
18478 case DW_FORM_data2:
18482 case DW_FORM_data4:
18486 case DW_FORM_data8:
18490 case DW_FORM_string:
18491 read_direct_string (abfd, bytes, &bytes_read);
18492 bytes += bytes_read;
18495 case DW_FORM_sec_offset:
18497 case DW_FORM_GNU_strp_alt:
18498 bytes += offset_size;
18501 case DW_FORM_block:
18502 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
18503 bytes += bytes_read;
18506 case DW_FORM_block1:
18507 bytes += 1 + read_1_byte (abfd, bytes);
18509 case DW_FORM_block2:
18510 bytes += 2 + read_2_bytes (abfd, bytes);
18512 case DW_FORM_block4:
18513 bytes += 4 + read_4_bytes (abfd, bytes);
18516 case DW_FORM_sdata:
18517 case DW_FORM_udata:
18518 case DW_FORM_GNU_addr_index:
18519 case DW_FORM_GNU_str_index:
18520 bytes = gdb_skip_leb128 (bytes, buffer_end);
18523 dwarf2_section_buffer_overflow_complaint (section);
18531 complaint (&symfile_complaints,
18532 _("invalid form 0x%x in `%s'"),
18534 section->asection->name);
18542 /* A helper for dwarf_decode_macros that handles skipping an unknown
18543 opcode. Returns an updated pointer to the macro data buffer; or,
18544 on error, issues a complaint and returns NULL. */
18546 static const gdb_byte *
18547 skip_unknown_opcode (unsigned int opcode,
18548 const gdb_byte **opcode_definitions,
18549 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
18551 unsigned int offset_size,
18552 struct dwarf2_section_info *section)
18554 unsigned int bytes_read, i;
18556 const gdb_byte *defn;
18558 if (opcode_definitions[opcode] == NULL)
18560 complaint (&symfile_complaints,
18561 _("unrecognized DW_MACFINO opcode 0x%x"),
18566 defn = opcode_definitions[opcode];
18567 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
18568 defn += bytes_read;
18570 for (i = 0; i < arg; ++i)
18572 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
18574 if (mac_ptr == NULL)
18576 /* skip_form_bytes already issued the complaint. */
18584 /* A helper function which parses the header of a macro section.
18585 If the macro section is the extended (for now called "GNU") type,
18586 then this updates *OFFSET_SIZE. Returns a pointer to just after
18587 the header, or issues a complaint and returns NULL on error. */
18589 static const gdb_byte *
18590 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
18592 const gdb_byte *mac_ptr,
18593 unsigned int *offset_size,
18594 int section_is_gnu)
18596 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
18598 if (section_is_gnu)
18600 unsigned int version, flags;
18602 version = read_2_bytes (abfd, mac_ptr);
18605 complaint (&symfile_complaints,
18606 _("unrecognized version `%d' in .debug_macro section"),
18612 flags = read_1_byte (abfd, mac_ptr);
18614 *offset_size = (flags & 1) ? 8 : 4;
18616 if ((flags & 2) != 0)
18617 /* We don't need the line table offset. */
18618 mac_ptr += *offset_size;
18620 /* Vendor opcode descriptions. */
18621 if ((flags & 4) != 0)
18623 unsigned int i, count;
18625 count = read_1_byte (abfd, mac_ptr);
18627 for (i = 0; i < count; ++i)
18629 unsigned int opcode, bytes_read;
18632 opcode = read_1_byte (abfd, mac_ptr);
18634 opcode_definitions[opcode] = mac_ptr;
18635 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18636 mac_ptr += bytes_read;
18645 /* A helper for dwarf_decode_macros that handles the GNU extensions,
18646 including DW_MACRO_GNU_transparent_include. */
18649 dwarf_decode_macro_bytes (bfd *abfd,
18650 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
18651 struct macro_source_file *current_file,
18652 struct line_header *lh, const char *comp_dir,
18653 struct dwarf2_section_info *section,
18654 int section_is_gnu, int section_is_dwz,
18655 unsigned int offset_size,
18656 struct objfile *objfile,
18657 htab_t include_hash)
18659 enum dwarf_macro_record_type macinfo_type;
18660 int at_commandline;
18661 const gdb_byte *opcode_definitions[256];
18663 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
18664 &offset_size, section_is_gnu);
18665 if (mac_ptr == NULL)
18667 /* We already issued a complaint. */
18671 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
18672 GDB is still reading the definitions from command line. First
18673 DW_MACINFO_start_file will need to be ignored as it was already executed
18674 to create CURRENT_FILE for the main source holding also the command line
18675 definitions. On first met DW_MACINFO_start_file this flag is reset to
18676 normally execute all the remaining DW_MACINFO_start_file macinfos. */
18678 at_commandline = 1;
18682 /* Do we at least have room for a macinfo type byte? */
18683 if (mac_ptr >= mac_end)
18685 dwarf2_section_buffer_overflow_complaint (section);
18689 macinfo_type = read_1_byte (abfd, mac_ptr);
18692 /* Note that we rely on the fact that the corresponding GNU and
18693 DWARF constants are the same. */
18694 switch (macinfo_type)
18696 /* A zero macinfo type indicates the end of the macro
18701 case DW_MACRO_GNU_define:
18702 case DW_MACRO_GNU_undef:
18703 case DW_MACRO_GNU_define_indirect:
18704 case DW_MACRO_GNU_undef_indirect:
18705 case DW_MACRO_GNU_define_indirect_alt:
18706 case DW_MACRO_GNU_undef_indirect_alt:
18708 unsigned int bytes_read;
18713 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18714 mac_ptr += bytes_read;
18716 if (macinfo_type == DW_MACRO_GNU_define
18717 || macinfo_type == DW_MACRO_GNU_undef)
18719 body = read_direct_string (abfd, mac_ptr, &bytes_read);
18720 mac_ptr += bytes_read;
18724 LONGEST str_offset;
18726 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
18727 mac_ptr += offset_size;
18729 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
18730 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
18733 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18735 body = read_indirect_string_from_dwz (dwz, str_offset);
18738 body = read_indirect_string_at_offset (abfd, str_offset);
18741 is_define = (macinfo_type == DW_MACRO_GNU_define
18742 || macinfo_type == DW_MACRO_GNU_define_indirect
18743 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
18744 if (! current_file)
18746 /* DWARF violation as no main source is present. */
18747 complaint (&symfile_complaints,
18748 _("debug info with no main source gives macro %s "
18750 is_define ? _("definition") : _("undefinition"),
18754 if ((line == 0 && !at_commandline)
18755 || (line != 0 && at_commandline))
18756 complaint (&symfile_complaints,
18757 _("debug info gives %s macro %s with %s line %d: %s"),
18758 at_commandline ? _("command-line") : _("in-file"),
18759 is_define ? _("definition") : _("undefinition"),
18760 line == 0 ? _("zero") : _("non-zero"), line, body);
18763 parse_macro_definition (current_file, line, body);
18766 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
18767 || macinfo_type == DW_MACRO_GNU_undef_indirect
18768 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
18769 macro_undef (current_file, line, body);
18774 case DW_MACRO_GNU_start_file:
18776 unsigned int bytes_read;
18779 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18780 mac_ptr += bytes_read;
18781 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18782 mac_ptr += bytes_read;
18784 if ((line == 0 && !at_commandline)
18785 || (line != 0 && at_commandline))
18786 complaint (&symfile_complaints,
18787 _("debug info gives source %d included "
18788 "from %s at %s line %d"),
18789 file, at_commandline ? _("command-line") : _("file"),
18790 line == 0 ? _("zero") : _("non-zero"), line);
18792 if (at_commandline)
18794 /* This DW_MACRO_GNU_start_file was executed in the
18796 at_commandline = 0;
18799 current_file = macro_start_file (file, line,
18800 current_file, comp_dir,
18805 case DW_MACRO_GNU_end_file:
18806 if (! current_file)
18807 complaint (&symfile_complaints,
18808 _("macro debug info has an unmatched "
18809 "`close_file' directive"));
18812 current_file = current_file->included_by;
18813 if (! current_file)
18815 enum dwarf_macro_record_type next_type;
18817 /* GCC circa March 2002 doesn't produce the zero
18818 type byte marking the end of the compilation
18819 unit. Complain if it's not there, but exit no
18822 /* Do we at least have room for a macinfo type byte? */
18823 if (mac_ptr >= mac_end)
18825 dwarf2_section_buffer_overflow_complaint (section);
18829 /* We don't increment mac_ptr here, so this is just
18831 next_type = read_1_byte (abfd, mac_ptr);
18832 if (next_type != 0)
18833 complaint (&symfile_complaints,
18834 _("no terminating 0-type entry for "
18835 "macros in `.debug_macinfo' section"));
18842 case DW_MACRO_GNU_transparent_include:
18843 case DW_MACRO_GNU_transparent_include_alt:
18847 bfd *include_bfd = abfd;
18848 struct dwarf2_section_info *include_section = section;
18849 struct dwarf2_section_info alt_section;
18850 const gdb_byte *include_mac_end = mac_end;
18851 int is_dwz = section_is_dwz;
18852 const gdb_byte *new_mac_ptr;
18854 offset = read_offset_1 (abfd, mac_ptr, offset_size);
18855 mac_ptr += offset_size;
18857 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
18859 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18861 dwarf2_read_section (dwarf2_per_objfile->objfile,
18864 include_bfd = dwz->macro.asection->owner;
18865 include_section = &dwz->macro;
18866 include_mac_end = dwz->macro.buffer + dwz->macro.size;
18870 new_mac_ptr = include_section->buffer + offset;
18871 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
18875 /* This has actually happened; see
18876 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
18877 complaint (&symfile_complaints,
18878 _("recursive DW_MACRO_GNU_transparent_include in "
18879 ".debug_macro section"));
18883 *slot = (void *) new_mac_ptr;
18885 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
18886 include_mac_end, current_file,
18888 section, section_is_gnu, is_dwz,
18889 offset_size, objfile, include_hash);
18891 htab_remove_elt (include_hash, (void *) new_mac_ptr);
18896 case DW_MACINFO_vendor_ext:
18897 if (!section_is_gnu)
18899 unsigned int bytes_read;
18902 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18903 mac_ptr += bytes_read;
18904 read_direct_string (abfd, mac_ptr, &bytes_read);
18905 mac_ptr += bytes_read;
18907 /* We don't recognize any vendor extensions. */
18913 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
18914 mac_ptr, mac_end, abfd, offset_size,
18916 if (mac_ptr == NULL)
18920 } while (macinfo_type != 0);
18924 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
18925 const char *comp_dir, int section_is_gnu)
18927 struct objfile *objfile = dwarf2_per_objfile->objfile;
18928 struct line_header *lh = cu->line_header;
18930 const gdb_byte *mac_ptr, *mac_end;
18931 struct macro_source_file *current_file = 0;
18932 enum dwarf_macro_record_type macinfo_type;
18933 unsigned int offset_size = cu->header.offset_size;
18934 const gdb_byte *opcode_definitions[256];
18935 struct cleanup *cleanup;
18936 htab_t include_hash;
18938 struct dwarf2_section_info *section;
18939 const char *section_name;
18941 if (cu->dwo_unit != NULL)
18943 if (section_is_gnu)
18945 section = &cu->dwo_unit->dwo_file->sections.macro;
18946 section_name = ".debug_macro.dwo";
18950 section = &cu->dwo_unit->dwo_file->sections.macinfo;
18951 section_name = ".debug_macinfo.dwo";
18956 if (section_is_gnu)
18958 section = &dwarf2_per_objfile->macro;
18959 section_name = ".debug_macro";
18963 section = &dwarf2_per_objfile->macinfo;
18964 section_name = ".debug_macinfo";
18968 dwarf2_read_section (objfile, section);
18969 if (section->buffer == NULL)
18971 complaint (&symfile_complaints, _("missing %s section"), section_name);
18974 abfd = section->asection->owner;
18976 /* First pass: Find the name of the base filename.
18977 This filename is needed in order to process all macros whose definition
18978 (or undefinition) comes from the command line. These macros are defined
18979 before the first DW_MACINFO_start_file entry, and yet still need to be
18980 associated to the base file.
18982 To determine the base file name, we scan the macro definitions until we
18983 reach the first DW_MACINFO_start_file entry. We then initialize
18984 CURRENT_FILE accordingly so that any macro definition found before the
18985 first DW_MACINFO_start_file can still be associated to the base file. */
18987 mac_ptr = section->buffer + offset;
18988 mac_end = section->buffer + section->size;
18990 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
18991 &offset_size, section_is_gnu);
18992 if (mac_ptr == NULL)
18994 /* We already issued a complaint. */
19000 /* Do we at least have room for a macinfo type byte? */
19001 if (mac_ptr >= mac_end)
19003 /* Complaint is printed during the second pass as GDB will probably
19004 stop the first pass earlier upon finding
19005 DW_MACINFO_start_file. */
19009 macinfo_type = read_1_byte (abfd, mac_ptr);
19012 /* Note that we rely on the fact that the corresponding GNU and
19013 DWARF constants are the same. */
19014 switch (macinfo_type)
19016 /* A zero macinfo type indicates the end of the macro
19021 case DW_MACRO_GNU_define:
19022 case DW_MACRO_GNU_undef:
19023 /* Only skip the data by MAC_PTR. */
19025 unsigned int bytes_read;
19027 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19028 mac_ptr += bytes_read;
19029 read_direct_string (abfd, mac_ptr, &bytes_read);
19030 mac_ptr += bytes_read;
19034 case DW_MACRO_GNU_start_file:
19036 unsigned int bytes_read;
19039 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19040 mac_ptr += bytes_read;
19041 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19042 mac_ptr += bytes_read;
19044 current_file = macro_start_file (file, line, current_file,
19045 comp_dir, lh, objfile);
19049 case DW_MACRO_GNU_end_file:
19050 /* No data to skip by MAC_PTR. */
19053 case DW_MACRO_GNU_define_indirect:
19054 case DW_MACRO_GNU_undef_indirect:
19055 case DW_MACRO_GNU_define_indirect_alt:
19056 case DW_MACRO_GNU_undef_indirect_alt:
19058 unsigned int bytes_read;
19060 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19061 mac_ptr += bytes_read;
19062 mac_ptr += offset_size;
19066 case DW_MACRO_GNU_transparent_include:
19067 case DW_MACRO_GNU_transparent_include_alt:
19068 /* Note that, according to the spec, a transparent include
19069 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19070 skip this opcode. */
19071 mac_ptr += offset_size;
19074 case DW_MACINFO_vendor_ext:
19075 /* Only skip the data by MAC_PTR. */
19076 if (!section_is_gnu)
19078 unsigned int bytes_read;
19080 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19081 mac_ptr += bytes_read;
19082 read_direct_string (abfd, mac_ptr, &bytes_read);
19083 mac_ptr += bytes_read;
19088 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19089 mac_ptr, mac_end, abfd, offset_size,
19091 if (mac_ptr == NULL)
19095 } while (macinfo_type != 0 && current_file == NULL);
19097 /* Second pass: Process all entries.
19099 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19100 command-line macro definitions/undefinitions. This flag is unset when we
19101 reach the first DW_MACINFO_start_file entry. */
19103 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19104 NULL, xcalloc, xfree);
19105 cleanup = make_cleanup_htab_delete (include_hash);
19106 mac_ptr = section->buffer + offset;
19107 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19108 *slot = (void *) mac_ptr;
19109 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19110 current_file, lh, comp_dir, section,
19112 offset_size, objfile, include_hash);
19113 do_cleanups (cleanup);
19116 /* Check if the attribute's form is a DW_FORM_block*
19117 if so return true else false. */
19120 attr_form_is_block (struct attribute *attr)
19122 return (attr == NULL ? 0 :
19123 attr->form == DW_FORM_block1
19124 || attr->form == DW_FORM_block2
19125 || attr->form == DW_FORM_block4
19126 || attr->form == DW_FORM_block
19127 || attr->form == DW_FORM_exprloc);
19130 /* Return non-zero if ATTR's value is a section offset --- classes
19131 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19132 You may use DW_UNSND (attr) to retrieve such offsets.
19134 Section 7.5.4, "Attribute Encodings", explains that no attribute
19135 may have a value that belongs to more than one of these classes; it
19136 would be ambiguous if we did, because we use the same forms for all
19140 attr_form_is_section_offset (struct attribute *attr)
19142 return (attr->form == DW_FORM_data4
19143 || attr->form == DW_FORM_data8
19144 || attr->form == DW_FORM_sec_offset);
19147 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19148 zero otherwise. When this function returns true, you can apply
19149 dwarf2_get_attr_constant_value to it.
19151 However, note that for some attributes you must check
19152 attr_form_is_section_offset before using this test. DW_FORM_data4
19153 and DW_FORM_data8 are members of both the constant class, and of
19154 the classes that contain offsets into other debug sections
19155 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19156 that, if an attribute's can be either a constant or one of the
19157 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19158 taken as section offsets, not constants. */
19161 attr_form_is_constant (struct attribute *attr)
19163 switch (attr->form)
19165 case DW_FORM_sdata:
19166 case DW_FORM_udata:
19167 case DW_FORM_data1:
19168 case DW_FORM_data2:
19169 case DW_FORM_data4:
19170 case DW_FORM_data8:
19177 /* Return the .debug_loc section to use for CU.
19178 For DWO files use .debug_loc.dwo. */
19180 static struct dwarf2_section_info *
19181 cu_debug_loc_section (struct dwarf2_cu *cu)
19184 return &cu->dwo_unit->dwo_file->sections.loc;
19185 return &dwarf2_per_objfile->loc;
19188 /* A helper function that fills in a dwarf2_loclist_baton. */
19191 fill_in_loclist_baton (struct dwarf2_cu *cu,
19192 struct dwarf2_loclist_baton *baton,
19193 struct attribute *attr)
19195 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19197 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19199 baton->per_cu = cu->per_cu;
19200 gdb_assert (baton->per_cu);
19201 /* We don't know how long the location list is, but make sure we
19202 don't run off the edge of the section. */
19203 baton->size = section->size - DW_UNSND (attr);
19204 baton->data = section->buffer + DW_UNSND (attr);
19205 baton->base_address = cu->base_address;
19206 baton->from_dwo = cu->dwo_unit != NULL;
19210 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19211 struct dwarf2_cu *cu, int is_block)
19213 struct objfile *objfile = dwarf2_per_objfile->objfile;
19214 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19216 if (attr_form_is_section_offset (attr)
19217 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19218 the section. If so, fall through to the complaint in the
19220 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19222 struct dwarf2_loclist_baton *baton;
19224 baton = obstack_alloc (&objfile->objfile_obstack,
19225 sizeof (struct dwarf2_loclist_baton));
19227 fill_in_loclist_baton (cu, baton, attr);
19229 if (cu->base_known == 0)
19230 complaint (&symfile_complaints,
19231 _("Location list used without "
19232 "specifying the CU base address."));
19234 SYMBOL_ACLASS_INDEX (sym) = (is_block
19235 ? dwarf2_loclist_block_index
19236 : dwarf2_loclist_index);
19237 SYMBOL_LOCATION_BATON (sym) = baton;
19241 struct dwarf2_locexpr_baton *baton;
19243 baton = obstack_alloc (&objfile->objfile_obstack,
19244 sizeof (struct dwarf2_locexpr_baton));
19245 baton->per_cu = cu->per_cu;
19246 gdb_assert (baton->per_cu);
19248 if (attr_form_is_block (attr))
19250 /* Note that we're just copying the block's data pointer
19251 here, not the actual data. We're still pointing into the
19252 info_buffer for SYM's objfile; right now we never release
19253 that buffer, but when we do clean up properly this may
19255 baton->size = DW_BLOCK (attr)->size;
19256 baton->data = DW_BLOCK (attr)->data;
19260 dwarf2_invalid_attrib_class_complaint ("location description",
19261 SYMBOL_NATURAL_NAME (sym));
19265 SYMBOL_ACLASS_INDEX (sym) = (is_block
19266 ? dwarf2_locexpr_block_index
19267 : dwarf2_locexpr_index);
19268 SYMBOL_LOCATION_BATON (sym) = baton;
19272 /* Return the OBJFILE associated with the compilation unit CU. If CU
19273 came from a separate debuginfo file, then the master objfile is
19277 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19279 struct objfile *objfile = per_cu->objfile;
19281 /* Return the master objfile, so that we can report and look up the
19282 correct file containing this variable. */
19283 if (objfile->separate_debug_objfile_backlink)
19284 objfile = objfile->separate_debug_objfile_backlink;
19289 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19290 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19291 CU_HEADERP first. */
19293 static const struct comp_unit_head *
19294 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19295 struct dwarf2_per_cu_data *per_cu)
19297 const gdb_byte *info_ptr;
19300 return &per_cu->cu->header;
19302 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
19304 memset (cu_headerp, 0, sizeof (*cu_headerp));
19305 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
19310 /* Return the address size given in the compilation unit header for CU. */
19313 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
19315 struct comp_unit_head cu_header_local;
19316 const struct comp_unit_head *cu_headerp;
19318 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19320 return cu_headerp->addr_size;
19323 /* Return the offset size given in the compilation unit header for CU. */
19326 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
19328 struct comp_unit_head cu_header_local;
19329 const struct comp_unit_head *cu_headerp;
19331 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19333 return cu_headerp->offset_size;
19336 /* See its dwarf2loc.h declaration. */
19339 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
19341 struct comp_unit_head cu_header_local;
19342 const struct comp_unit_head *cu_headerp;
19344 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19346 if (cu_headerp->version == 2)
19347 return cu_headerp->addr_size;
19349 return cu_headerp->offset_size;
19352 /* Return the text offset of the CU. The returned offset comes from
19353 this CU's objfile. If this objfile came from a separate debuginfo
19354 file, then the offset may be different from the corresponding
19355 offset in the parent objfile. */
19358 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
19360 struct objfile *objfile = per_cu->objfile;
19362 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19365 /* Locate the .debug_info compilation unit from CU's objfile which contains
19366 the DIE at OFFSET. Raises an error on failure. */
19368 static struct dwarf2_per_cu_data *
19369 dwarf2_find_containing_comp_unit (sect_offset offset,
19370 unsigned int offset_in_dwz,
19371 struct objfile *objfile)
19373 struct dwarf2_per_cu_data *this_cu;
19375 const sect_offset *cu_off;
19378 high = dwarf2_per_objfile->n_comp_units - 1;
19381 struct dwarf2_per_cu_data *mid_cu;
19382 int mid = low + (high - low) / 2;
19384 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
19385 cu_off = &mid_cu->offset;
19386 if (mid_cu->is_dwz > offset_in_dwz
19387 || (mid_cu->is_dwz == offset_in_dwz
19388 && cu_off->sect_off >= offset.sect_off))
19393 gdb_assert (low == high);
19394 this_cu = dwarf2_per_objfile->all_comp_units[low];
19395 cu_off = &this_cu->offset;
19396 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
19398 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
19399 error (_("Dwarf Error: could not find partial DIE containing "
19400 "offset 0x%lx [in module %s]"),
19401 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
19403 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
19404 <= offset.sect_off);
19405 return dwarf2_per_objfile->all_comp_units[low-1];
19409 this_cu = dwarf2_per_objfile->all_comp_units[low];
19410 if (low == dwarf2_per_objfile->n_comp_units - 1
19411 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
19412 error (_("invalid dwarf2 offset %u"), offset.sect_off);
19413 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
19418 /* Initialize dwarf2_cu CU, owned by PER_CU. */
19421 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
19423 memset (cu, 0, sizeof (*cu));
19425 cu->per_cu = per_cu;
19426 cu->objfile = per_cu->objfile;
19427 obstack_init (&cu->comp_unit_obstack);
19430 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
19433 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
19434 enum language pretend_language)
19436 struct attribute *attr;
19438 /* Set the language we're debugging. */
19439 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
19441 set_cu_language (DW_UNSND (attr), cu);
19444 cu->language = pretend_language;
19445 cu->language_defn = language_def (cu->language);
19448 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
19450 cu->producer = DW_STRING (attr);
19453 /* Release one cached compilation unit, CU. We unlink it from the tree
19454 of compilation units, but we don't remove it from the read_in_chain;
19455 the caller is responsible for that.
19456 NOTE: DATA is a void * because this function is also used as a
19457 cleanup routine. */
19460 free_heap_comp_unit (void *data)
19462 struct dwarf2_cu *cu = data;
19464 gdb_assert (cu->per_cu != NULL);
19465 cu->per_cu->cu = NULL;
19468 obstack_free (&cu->comp_unit_obstack, NULL);
19473 /* This cleanup function is passed the address of a dwarf2_cu on the stack
19474 when we're finished with it. We can't free the pointer itself, but be
19475 sure to unlink it from the cache. Also release any associated storage. */
19478 free_stack_comp_unit (void *data)
19480 struct dwarf2_cu *cu = data;
19482 gdb_assert (cu->per_cu != NULL);
19483 cu->per_cu->cu = NULL;
19486 obstack_free (&cu->comp_unit_obstack, NULL);
19487 cu->partial_dies = NULL;
19490 /* Free all cached compilation units. */
19493 free_cached_comp_units (void *data)
19495 struct dwarf2_per_cu_data *per_cu, **last_chain;
19497 per_cu = dwarf2_per_objfile->read_in_chain;
19498 last_chain = &dwarf2_per_objfile->read_in_chain;
19499 while (per_cu != NULL)
19501 struct dwarf2_per_cu_data *next_cu;
19503 next_cu = per_cu->cu->read_in_chain;
19505 free_heap_comp_unit (per_cu->cu);
19506 *last_chain = next_cu;
19512 /* Increase the age counter on each cached compilation unit, and free
19513 any that are too old. */
19516 age_cached_comp_units (void)
19518 struct dwarf2_per_cu_data *per_cu, **last_chain;
19520 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
19521 per_cu = dwarf2_per_objfile->read_in_chain;
19522 while (per_cu != NULL)
19524 per_cu->cu->last_used ++;
19525 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
19526 dwarf2_mark (per_cu->cu);
19527 per_cu = per_cu->cu->read_in_chain;
19530 per_cu = dwarf2_per_objfile->read_in_chain;
19531 last_chain = &dwarf2_per_objfile->read_in_chain;
19532 while (per_cu != NULL)
19534 struct dwarf2_per_cu_data *next_cu;
19536 next_cu = per_cu->cu->read_in_chain;
19538 if (!per_cu->cu->mark)
19540 free_heap_comp_unit (per_cu->cu);
19541 *last_chain = next_cu;
19544 last_chain = &per_cu->cu->read_in_chain;
19550 /* Remove a single compilation unit from the cache. */
19553 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
19555 struct dwarf2_per_cu_data *per_cu, **last_chain;
19557 per_cu = dwarf2_per_objfile->read_in_chain;
19558 last_chain = &dwarf2_per_objfile->read_in_chain;
19559 while (per_cu != NULL)
19561 struct dwarf2_per_cu_data *next_cu;
19563 next_cu = per_cu->cu->read_in_chain;
19565 if (per_cu == target_per_cu)
19567 free_heap_comp_unit (per_cu->cu);
19569 *last_chain = next_cu;
19573 last_chain = &per_cu->cu->read_in_chain;
19579 /* Release all extra memory associated with OBJFILE. */
19582 dwarf2_free_objfile (struct objfile *objfile)
19584 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
19586 if (dwarf2_per_objfile == NULL)
19589 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
19590 free_cached_comp_units (NULL);
19592 if (dwarf2_per_objfile->quick_file_names_table)
19593 htab_delete (dwarf2_per_objfile->quick_file_names_table);
19595 /* Everything else should be on the objfile obstack. */
19598 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
19599 We store these in a hash table separate from the DIEs, and preserve them
19600 when the DIEs are flushed out of cache.
19602 The CU "per_cu" pointer is needed because offset alone is not enough to
19603 uniquely identify the type. A file may have multiple .debug_types sections,
19604 or the type may come from a DWO file. Furthermore, while it's more logical
19605 to use per_cu->section+offset, with Fission the section with the data is in
19606 the DWO file but we don't know that section at the point we need it.
19607 We have to use something in dwarf2_per_cu_data (or the pointer to it)
19608 because we can enter the lookup routine, get_die_type_at_offset, from
19609 outside this file, and thus won't necessarily have PER_CU->cu.
19610 Fortunately, PER_CU is stable for the life of the objfile. */
19612 struct dwarf2_per_cu_offset_and_type
19614 const struct dwarf2_per_cu_data *per_cu;
19615 sect_offset offset;
19619 /* Hash function for a dwarf2_per_cu_offset_and_type. */
19622 per_cu_offset_and_type_hash (const void *item)
19624 const struct dwarf2_per_cu_offset_and_type *ofs = item;
19626 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
19629 /* Equality function for a dwarf2_per_cu_offset_and_type. */
19632 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
19634 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
19635 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
19637 return (ofs_lhs->per_cu == ofs_rhs->per_cu
19638 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
19641 /* Set the type associated with DIE to TYPE. Save it in CU's hash
19642 table if necessary. For convenience, return TYPE.
19644 The DIEs reading must have careful ordering to:
19645 * Not cause infite loops trying to read in DIEs as a prerequisite for
19646 reading current DIE.
19647 * Not trying to dereference contents of still incompletely read in types
19648 while reading in other DIEs.
19649 * Enable referencing still incompletely read in types just by a pointer to
19650 the type without accessing its fields.
19652 Therefore caller should follow these rules:
19653 * Try to fetch any prerequisite types we may need to build this DIE type
19654 before building the type and calling set_die_type.
19655 * After building type call set_die_type for current DIE as soon as
19656 possible before fetching more types to complete the current type.
19657 * Make the type as complete as possible before fetching more types. */
19659 static struct type *
19660 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19662 struct dwarf2_per_cu_offset_and_type **slot, ofs;
19663 struct objfile *objfile = cu->objfile;
19665 /* For Ada types, make sure that the gnat-specific data is always
19666 initialized (if not already set). There are a few types where
19667 we should not be doing so, because the type-specific area is
19668 already used to hold some other piece of info (eg: TYPE_CODE_FLT
19669 where the type-specific area is used to store the floatformat).
19670 But this is not a problem, because the gnat-specific information
19671 is actually not needed for these types. */
19672 if (need_gnat_info (cu)
19673 && TYPE_CODE (type) != TYPE_CODE_FUNC
19674 && TYPE_CODE (type) != TYPE_CODE_FLT
19675 && !HAVE_GNAT_AUX_INFO (type))
19676 INIT_GNAT_SPECIFIC (type);
19678 if (dwarf2_per_objfile->die_type_hash == NULL)
19680 dwarf2_per_objfile->die_type_hash =
19681 htab_create_alloc_ex (127,
19682 per_cu_offset_and_type_hash,
19683 per_cu_offset_and_type_eq,
19685 &objfile->objfile_obstack,
19686 hashtab_obstack_allocate,
19687 dummy_obstack_deallocate);
19690 ofs.per_cu = cu->per_cu;
19691 ofs.offset = die->offset;
19693 slot = (struct dwarf2_per_cu_offset_and_type **)
19694 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
19696 complaint (&symfile_complaints,
19697 _("A problem internal to GDB: DIE 0x%x has type already set"),
19698 die->offset.sect_off);
19699 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
19704 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
19705 or return NULL if the die does not have a saved type. */
19707 static struct type *
19708 get_die_type_at_offset (sect_offset offset,
19709 struct dwarf2_per_cu_data *per_cu)
19711 struct dwarf2_per_cu_offset_and_type *slot, ofs;
19713 if (dwarf2_per_objfile->die_type_hash == NULL)
19716 ofs.per_cu = per_cu;
19717 ofs.offset = offset;
19718 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
19725 /* Look up the type for DIE in CU in die_type_hash,
19726 or return NULL if DIE does not have a saved type. */
19728 static struct type *
19729 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
19731 return get_die_type_at_offset (die->offset, cu->per_cu);
19734 /* Add a dependence relationship from CU to REF_PER_CU. */
19737 dwarf2_add_dependence (struct dwarf2_cu *cu,
19738 struct dwarf2_per_cu_data *ref_per_cu)
19742 if (cu->dependencies == NULL)
19744 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
19745 NULL, &cu->comp_unit_obstack,
19746 hashtab_obstack_allocate,
19747 dummy_obstack_deallocate);
19749 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
19751 *slot = ref_per_cu;
19754 /* Subroutine of dwarf2_mark to pass to htab_traverse.
19755 Set the mark field in every compilation unit in the
19756 cache that we must keep because we are keeping CU. */
19759 dwarf2_mark_helper (void **slot, void *data)
19761 struct dwarf2_per_cu_data *per_cu;
19763 per_cu = (struct dwarf2_per_cu_data *) *slot;
19765 /* cu->dependencies references may not yet have been ever read if QUIT aborts
19766 reading of the chain. As such dependencies remain valid it is not much
19767 useful to track and undo them during QUIT cleanups. */
19768 if (per_cu->cu == NULL)
19771 if (per_cu->cu->mark)
19773 per_cu->cu->mark = 1;
19775 if (per_cu->cu->dependencies != NULL)
19776 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
19781 /* Set the mark field in CU and in every other compilation unit in the
19782 cache that we must keep because we are keeping CU. */
19785 dwarf2_mark (struct dwarf2_cu *cu)
19790 if (cu->dependencies != NULL)
19791 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
19795 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
19799 per_cu->cu->mark = 0;
19800 per_cu = per_cu->cu->read_in_chain;
19804 /* Trivial hash function for partial_die_info: the hash value of a DIE
19805 is its offset in .debug_info for this objfile. */
19808 partial_die_hash (const void *item)
19810 const struct partial_die_info *part_die = item;
19812 return part_die->offset.sect_off;
19815 /* Trivial comparison function for partial_die_info structures: two DIEs
19816 are equal if they have the same offset. */
19819 partial_die_eq (const void *item_lhs, const void *item_rhs)
19821 const struct partial_die_info *part_die_lhs = item_lhs;
19822 const struct partial_die_info *part_die_rhs = item_rhs;
19824 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
19827 static struct cmd_list_element *set_dwarf2_cmdlist;
19828 static struct cmd_list_element *show_dwarf2_cmdlist;
19831 set_dwarf2_cmd (char *args, int from_tty)
19833 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
19837 show_dwarf2_cmd (char *args, int from_tty)
19839 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
19842 /* Free data associated with OBJFILE, if necessary. */
19845 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
19847 struct dwarf2_per_objfile *data = d;
19850 for (ix = 0; ix < dwarf2_per_objfile->n_comp_units; ++ix)
19851 VEC_free (dwarf2_per_cu_ptr,
19852 dwarf2_per_objfile->all_comp_units[ix]->imported_symtabs);
19854 for (ix = 0; ix < dwarf2_per_objfile->n_type_units; ++ix)
19855 VEC_free (dwarf2_per_cu_ptr,
19856 dwarf2_per_objfile->all_type_units[ix]->per_cu.imported_symtabs);
19858 VEC_free (dwarf2_section_info_def, data->types);
19860 if (data->dwo_files)
19861 free_dwo_files (data->dwo_files, objfile);
19862 if (data->dwp_file)
19863 gdb_bfd_unref (data->dwp_file->dbfd);
19865 if (data->dwz_file && data->dwz_file->dwz_bfd)
19866 gdb_bfd_unref (data->dwz_file->dwz_bfd);
19870 /* The "save gdb-index" command. */
19872 /* The contents of the hash table we create when building the string
19874 struct strtab_entry
19876 offset_type offset;
19880 /* Hash function for a strtab_entry.
19882 Function is used only during write_hash_table so no index format backward
19883 compatibility is needed. */
19886 hash_strtab_entry (const void *e)
19888 const struct strtab_entry *entry = e;
19889 return mapped_index_string_hash (INT_MAX, entry->str);
19892 /* Equality function for a strtab_entry. */
19895 eq_strtab_entry (const void *a, const void *b)
19897 const struct strtab_entry *ea = a;
19898 const struct strtab_entry *eb = b;
19899 return !strcmp (ea->str, eb->str);
19902 /* Create a strtab_entry hash table. */
19905 create_strtab (void)
19907 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
19908 xfree, xcalloc, xfree);
19911 /* Add a string to the constant pool. Return the string's offset in
19915 add_string (htab_t table, struct obstack *cpool, const char *str)
19918 struct strtab_entry entry;
19919 struct strtab_entry *result;
19922 slot = htab_find_slot (table, &entry, INSERT);
19927 result = XNEW (struct strtab_entry);
19928 result->offset = obstack_object_size (cpool);
19930 obstack_grow_str0 (cpool, str);
19933 return result->offset;
19936 /* An entry in the symbol table. */
19937 struct symtab_index_entry
19939 /* The name of the symbol. */
19941 /* The offset of the name in the constant pool. */
19942 offset_type index_offset;
19943 /* A sorted vector of the indices of all the CUs that hold an object
19945 VEC (offset_type) *cu_indices;
19948 /* The symbol table. This is a power-of-2-sized hash table. */
19949 struct mapped_symtab
19951 offset_type n_elements;
19953 struct symtab_index_entry **data;
19956 /* Hash function for a symtab_index_entry. */
19959 hash_symtab_entry (const void *e)
19961 const struct symtab_index_entry *entry = e;
19962 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
19963 sizeof (offset_type) * VEC_length (offset_type,
19964 entry->cu_indices),
19968 /* Equality function for a symtab_index_entry. */
19971 eq_symtab_entry (const void *a, const void *b)
19973 const struct symtab_index_entry *ea = a;
19974 const struct symtab_index_entry *eb = b;
19975 int len = VEC_length (offset_type, ea->cu_indices);
19976 if (len != VEC_length (offset_type, eb->cu_indices))
19978 return !memcmp (VEC_address (offset_type, ea->cu_indices),
19979 VEC_address (offset_type, eb->cu_indices),
19980 sizeof (offset_type) * len);
19983 /* Destroy a symtab_index_entry. */
19986 delete_symtab_entry (void *p)
19988 struct symtab_index_entry *entry = p;
19989 VEC_free (offset_type, entry->cu_indices);
19993 /* Create a hash table holding symtab_index_entry objects. */
19996 create_symbol_hash_table (void)
19998 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
19999 delete_symtab_entry, xcalloc, xfree);
20002 /* Create a new mapped symtab object. */
20004 static struct mapped_symtab *
20005 create_mapped_symtab (void)
20007 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20008 symtab->n_elements = 0;
20009 symtab->size = 1024;
20010 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20014 /* Destroy a mapped_symtab. */
20017 cleanup_mapped_symtab (void *p)
20019 struct mapped_symtab *symtab = p;
20020 /* The contents of the array are freed when the other hash table is
20022 xfree (symtab->data);
20026 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20029 Function is used only during write_hash_table so no index format backward
20030 compatibility is needed. */
20032 static struct symtab_index_entry **
20033 find_slot (struct mapped_symtab *symtab, const char *name)
20035 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20037 index = hash & (symtab->size - 1);
20038 step = ((hash * 17) & (symtab->size - 1)) | 1;
20042 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20043 return &symtab->data[index];
20044 index = (index + step) & (symtab->size - 1);
20048 /* Expand SYMTAB's hash table. */
20051 hash_expand (struct mapped_symtab *symtab)
20053 offset_type old_size = symtab->size;
20055 struct symtab_index_entry **old_entries = symtab->data;
20058 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20060 for (i = 0; i < old_size; ++i)
20062 if (old_entries[i])
20064 struct symtab_index_entry **slot = find_slot (symtab,
20065 old_entries[i]->name);
20066 *slot = old_entries[i];
20070 xfree (old_entries);
20073 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20074 CU_INDEX is the index of the CU in which the symbol appears.
20075 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20078 add_index_entry (struct mapped_symtab *symtab, const char *name,
20079 int is_static, gdb_index_symbol_kind kind,
20080 offset_type cu_index)
20082 struct symtab_index_entry **slot;
20083 offset_type cu_index_and_attrs;
20085 ++symtab->n_elements;
20086 if (4 * symtab->n_elements / 3 >= symtab->size)
20087 hash_expand (symtab);
20089 slot = find_slot (symtab, name);
20092 *slot = XNEW (struct symtab_index_entry);
20093 (*slot)->name = name;
20094 /* index_offset is set later. */
20095 (*slot)->cu_indices = NULL;
20098 cu_index_and_attrs = 0;
20099 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20100 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20101 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20103 /* We don't want to record an index value twice as we want to avoid the
20105 We process all global symbols and then all static symbols
20106 (which would allow us to avoid the duplication by only having to check
20107 the last entry pushed), but a symbol could have multiple kinds in one CU.
20108 To keep things simple we don't worry about the duplication here and
20109 sort and uniqufy the list after we've processed all symbols. */
20110 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20113 /* qsort helper routine for uniquify_cu_indices. */
20116 offset_type_compare (const void *ap, const void *bp)
20118 offset_type a = *(offset_type *) ap;
20119 offset_type b = *(offset_type *) bp;
20121 return (a > b) - (b > a);
20124 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20127 uniquify_cu_indices (struct mapped_symtab *symtab)
20131 for (i = 0; i < symtab->size; ++i)
20133 struct symtab_index_entry *entry = symtab->data[i];
20136 && entry->cu_indices != NULL)
20138 unsigned int next_to_insert, next_to_check;
20139 offset_type last_value;
20141 qsort (VEC_address (offset_type, entry->cu_indices),
20142 VEC_length (offset_type, entry->cu_indices),
20143 sizeof (offset_type), offset_type_compare);
20145 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20146 next_to_insert = 1;
20147 for (next_to_check = 1;
20148 next_to_check < VEC_length (offset_type, entry->cu_indices);
20151 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20154 last_value = VEC_index (offset_type, entry->cu_indices,
20156 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20161 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20166 /* Add a vector of indices to the constant pool. */
20169 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20170 struct symtab_index_entry *entry)
20174 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20177 offset_type len = VEC_length (offset_type, entry->cu_indices);
20178 offset_type val = MAYBE_SWAP (len);
20183 entry->index_offset = obstack_object_size (cpool);
20185 obstack_grow (cpool, &val, sizeof (val));
20187 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20190 val = MAYBE_SWAP (iter);
20191 obstack_grow (cpool, &val, sizeof (val));
20196 struct symtab_index_entry *old_entry = *slot;
20197 entry->index_offset = old_entry->index_offset;
20200 return entry->index_offset;
20203 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20204 constant pool entries going into the obstack CPOOL. */
20207 write_hash_table (struct mapped_symtab *symtab,
20208 struct obstack *output, struct obstack *cpool)
20211 htab_t symbol_hash_table;
20214 symbol_hash_table = create_symbol_hash_table ();
20215 str_table = create_strtab ();
20217 /* We add all the index vectors to the constant pool first, to
20218 ensure alignment is ok. */
20219 for (i = 0; i < symtab->size; ++i)
20221 if (symtab->data[i])
20222 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20225 /* Now write out the hash table. */
20226 for (i = 0; i < symtab->size; ++i)
20228 offset_type str_off, vec_off;
20230 if (symtab->data[i])
20232 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20233 vec_off = symtab->data[i]->index_offset;
20237 /* While 0 is a valid constant pool index, it is not valid
20238 to have 0 for both offsets. */
20243 str_off = MAYBE_SWAP (str_off);
20244 vec_off = MAYBE_SWAP (vec_off);
20246 obstack_grow (output, &str_off, sizeof (str_off));
20247 obstack_grow (output, &vec_off, sizeof (vec_off));
20250 htab_delete (str_table);
20251 htab_delete (symbol_hash_table);
20254 /* Struct to map psymtab to CU index in the index file. */
20255 struct psymtab_cu_index_map
20257 struct partial_symtab *psymtab;
20258 unsigned int cu_index;
20262 hash_psymtab_cu_index (const void *item)
20264 const struct psymtab_cu_index_map *map = item;
20266 return htab_hash_pointer (map->psymtab);
20270 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
20272 const struct psymtab_cu_index_map *lhs = item_lhs;
20273 const struct psymtab_cu_index_map *rhs = item_rhs;
20275 return lhs->psymtab == rhs->psymtab;
20278 /* Helper struct for building the address table. */
20279 struct addrmap_index_data
20281 struct objfile *objfile;
20282 struct obstack *addr_obstack;
20283 htab_t cu_index_htab;
20285 /* Non-zero if the previous_* fields are valid.
20286 We can't write an entry until we see the next entry (since it is only then
20287 that we know the end of the entry). */
20288 int previous_valid;
20289 /* Index of the CU in the table of all CUs in the index file. */
20290 unsigned int previous_cu_index;
20291 /* Start address of the CU. */
20292 CORE_ADDR previous_cu_start;
20295 /* Write an address entry to OBSTACK. */
20298 add_address_entry (struct objfile *objfile, struct obstack *obstack,
20299 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
20301 offset_type cu_index_to_write;
20303 CORE_ADDR baseaddr;
20305 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20307 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
20308 obstack_grow (obstack, addr, 8);
20309 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
20310 obstack_grow (obstack, addr, 8);
20311 cu_index_to_write = MAYBE_SWAP (cu_index);
20312 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
20315 /* Worker function for traversing an addrmap to build the address table. */
20318 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
20320 struct addrmap_index_data *data = datap;
20321 struct partial_symtab *pst = obj;
20323 if (data->previous_valid)
20324 add_address_entry (data->objfile, data->addr_obstack,
20325 data->previous_cu_start, start_addr,
20326 data->previous_cu_index);
20328 data->previous_cu_start = start_addr;
20331 struct psymtab_cu_index_map find_map, *map;
20332 find_map.psymtab = pst;
20333 map = htab_find (data->cu_index_htab, &find_map);
20334 gdb_assert (map != NULL);
20335 data->previous_cu_index = map->cu_index;
20336 data->previous_valid = 1;
20339 data->previous_valid = 0;
20344 /* Write OBJFILE's address map to OBSTACK.
20345 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
20346 in the index file. */
20349 write_address_map (struct objfile *objfile, struct obstack *obstack,
20350 htab_t cu_index_htab)
20352 struct addrmap_index_data addrmap_index_data;
20354 /* When writing the address table, we have to cope with the fact that
20355 the addrmap iterator only provides the start of a region; we have to
20356 wait until the next invocation to get the start of the next region. */
20358 addrmap_index_data.objfile = objfile;
20359 addrmap_index_data.addr_obstack = obstack;
20360 addrmap_index_data.cu_index_htab = cu_index_htab;
20361 addrmap_index_data.previous_valid = 0;
20363 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
20364 &addrmap_index_data);
20366 /* It's highly unlikely the last entry (end address = 0xff...ff)
20367 is valid, but we should still handle it.
20368 The end address is recorded as the start of the next region, but that
20369 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
20371 if (addrmap_index_data.previous_valid)
20372 add_address_entry (objfile, obstack,
20373 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
20374 addrmap_index_data.previous_cu_index);
20377 /* Return the symbol kind of PSYM. */
20379 static gdb_index_symbol_kind
20380 symbol_kind (struct partial_symbol *psym)
20382 domain_enum domain = PSYMBOL_DOMAIN (psym);
20383 enum address_class aclass = PSYMBOL_CLASS (psym);
20391 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
20393 return GDB_INDEX_SYMBOL_KIND_TYPE;
20395 case LOC_CONST_BYTES:
20396 case LOC_OPTIMIZED_OUT:
20398 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20400 /* Note: It's currently impossible to recognize psyms as enum values
20401 short of reading the type info. For now punt. */
20402 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20404 /* There are other LOC_FOO values that one might want to classify
20405 as variables, but dwarf2read.c doesn't currently use them. */
20406 return GDB_INDEX_SYMBOL_KIND_OTHER;
20408 case STRUCT_DOMAIN:
20409 return GDB_INDEX_SYMBOL_KIND_TYPE;
20411 return GDB_INDEX_SYMBOL_KIND_OTHER;
20415 /* Add a list of partial symbols to SYMTAB. */
20418 write_psymbols (struct mapped_symtab *symtab,
20420 struct partial_symbol **psymp,
20422 offset_type cu_index,
20425 for (; count-- > 0; ++psymp)
20427 struct partial_symbol *psym = *psymp;
20430 if (SYMBOL_LANGUAGE (psym) == language_ada)
20431 error (_("Ada is not currently supported by the index"));
20433 /* Only add a given psymbol once. */
20434 slot = htab_find_slot (psyms_seen, psym, INSERT);
20437 gdb_index_symbol_kind kind = symbol_kind (psym);
20440 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
20441 is_static, kind, cu_index);
20446 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
20447 exception if there is an error. */
20450 write_obstack (FILE *file, struct obstack *obstack)
20452 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
20454 != obstack_object_size (obstack))
20455 error (_("couldn't data write to file"));
20458 /* Unlink a file if the argument is not NULL. */
20461 unlink_if_set (void *p)
20463 char **filename = p;
20465 unlink (*filename);
20468 /* A helper struct used when iterating over debug_types. */
20469 struct signatured_type_index_data
20471 struct objfile *objfile;
20472 struct mapped_symtab *symtab;
20473 struct obstack *types_list;
20478 /* A helper function that writes a single signatured_type to an
20482 write_one_signatured_type (void **slot, void *d)
20484 struct signatured_type_index_data *info = d;
20485 struct signatured_type *entry = (struct signatured_type *) *slot;
20486 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
20489 write_psymbols (info->symtab,
20491 info->objfile->global_psymbols.list
20492 + psymtab->globals_offset,
20493 psymtab->n_global_syms, info->cu_index,
20495 write_psymbols (info->symtab,
20497 info->objfile->static_psymbols.list
20498 + psymtab->statics_offset,
20499 psymtab->n_static_syms, info->cu_index,
20502 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20503 entry->per_cu.offset.sect_off);
20504 obstack_grow (info->types_list, val, 8);
20505 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20506 entry->type_offset_in_tu.cu_off);
20507 obstack_grow (info->types_list, val, 8);
20508 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
20509 obstack_grow (info->types_list, val, 8);
20516 /* Recurse into all "included" dependencies and write their symbols as
20517 if they appeared in this psymtab. */
20520 recursively_write_psymbols (struct objfile *objfile,
20521 struct partial_symtab *psymtab,
20522 struct mapped_symtab *symtab,
20524 offset_type cu_index)
20528 for (i = 0; i < psymtab->number_of_dependencies; ++i)
20529 if (psymtab->dependencies[i]->user != NULL)
20530 recursively_write_psymbols (objfile, psymtab->dependencies[i],
20531 symtab, psyms_seen, cu_index);
20533 write_psymbols (symtab,
20535 objfile->global_psymbols.list + psymtab->globals_offset,
20536 psymtab->n_global_syms, cu_index,
20538 write_psymbols (symtab,
20540 objfile->static_psymbols.list + psymtab->statics_offset,
20541 psymtab->n_static_syms, cu_index,
20545 /* Create an index file for OBJFILE in the directory DIR. */
20548 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
20550 struct cleanup *cleanup;
20551 char *filename, *cleanup_filename;
20552 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
20553 struct obstack cu_list, types_cu_list;
20556 struct mapped_symtab *symtab;
20557 offset_type val, size_of_contents, total_len;
20560 htab_t cu_index_htab;
20561 struct psymtab_cu_index_map *psymtab_cu_index_map;
20563 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
20566 if (dwarf2_per_objfile->using_index)
20567 error (_("Cannot use an index to create the index"));
20569 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
20570 error (_("Cannot make an index when the file has multiple .debug_types sections"));
20572 if (stat (objfile->name, &st) < 0)
20573 perror_with_name (objfile->name);
20575 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
20576 INDEX_SUFFIX, (char *) NULL);
20577 cleanup = make_cleanup (xfree, filename);
20579 out_file = fopen (filename, "wb");
20581 error (_("Can't open `%s' for writing"), filename);
20583 cleanup_filename = filename;
20584 make_cleanup (unlink_if_set, &cleanup_filename);
20586 symtab = create_mapped_symtab ();
20587 make_cleanup (cleanup_mapped_symtab, symtab);
20589 obstack_init (&addr_obstack);
20590 make_cleanup_obstack_free (&addr_obstack);
20592 obstack_init (&cu_list);
20593 make_cleanup_obstack_free (&cu_list);
20595 obstack_init (&types_cu_list);
20596 make_cleanup_obstack_free (&types_cu_list);
20598 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
20599 NULL, xcalloc, xfree);
20600 make_cleanup_htab_delete (psyms_seen);
20602 /* While we're scanning CU's create a table that maps a psymtab pointer
20603 (which is what addrmap records) to its index (which is what is recorded
20604 in the index file). This will later be needed to write the address
20606 cu_index_htab = htab_create_alloc (100,
20607 hash_psymtab_cu_index,
20608 eq_psymtab_cu_index,
20609 NULL, xcalloc, xfree);
20610 make_cleanup_htab_delete (cu_index_htab);
20611 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
20612 xmalloc (sizeof (struct psymtab_cu_index_map)
20613 * dwarf2_per_objfile->n_comp_units);
20614 make_cleanup (xfree, psymtab_cu_index_map);
20616 /* The CU list is already sorted, so we don't need to do additional
20617 work here. Also, the debug_types entries do not appear in
20618 all_comp_units, but only in their own hash table. */
20619 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
20621 struct dwarf2_per_cu_data *per_cu
20622 = dwarf2_per_objfile->all_comp_units[i];
20623 struct partial_symtab *psymtab = per_cu->v.psymtab;
20625 struct psymtab_cu_index_map *map;
20628 if (psymtab->user == NULL)
20629 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
20631 map = &psymtab_cu_index_map[i];
20632 map->psymtab = psymtab;
20634 slot = htab_find_slot (cu_index_htab, map, INSERT);
20635 gdb_assert (slot != NULL);
20636 gdb_assert (*slot == NULL);
20639 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20640 per_cu->offset.sect_off);
20641 obstack_grow (&cu_list, val, 8);
20642 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
20643 obstack_grow (&cu_list, val, 8);
20646 /* Dump the address map. */
20647 write_address_map (objfile, &addr_obstack, cu_index_htab);
20649 /* Write out the .debug_type entries, if any. */
20650 if (dwarf2_per_objfile->signatured_types)
20652 struct signatured_type_index_data sig_data;
20654 sig_data.objfile = objfile;
20655 sig_data.symtab = symtab;
20656 sig_data.types_list = &types_cu_list;
20657 sig_data.psyms_seen = psyms_seen;
20658 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
20659 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
20660 write_one_signatured_type, &sig_data);
20663 /* Now that we've processed all symbols we can shrink their cu_indices
20665 uniquify_cu_indices (symtab);
20667 obstack_init (&constant_pool);
20668 make_cleanup_obstack_free (&constant_pool);
20669 obstack_init (&symtab_obstack);
20670 make_cleanup_obstack_free (&symtab_obstack);
20671 write_hash_table (symtab, &symtab_obstack, &constant_pool);
20673 obstack_init (&contents);
20674 make_cleanup_obstack_free (&contents);
20675 size_of_contents = 6 * sizeof (offset_type);
20676 total_len = size_of_contents;
20678 /* The version number. */
20679 val = MAYBE_SWAP (8);
20680 obstack_grow (&contents, &val, sizeof (val));
20682 /* The offset of the CU list from the start of the file. */
20683 val = MAYBE_SWAP (total_len);
20684 obstack_grow (&contents, &val, sizeof (val));
20685 total_len += obstack_object_size (&cu_list);
20687 /* The offset of the types CU list from the start of the file. */
20688 val = MAYBE_SWAP (total_len);
20689 obstack_grow (&contents, &val, sizeof (val));
20690 total_len += obstack_object_size (&types_cu_list);
20692 /* The offset of the address table from the start of the file. */
20693 val = MAYBE_SWAP (total_len);
20694 obstack_grow (&contents, &val, sizeof (val));
20695 total_len += obstack_object_size (&addr_obstack);
20697 /* The offset of the symbol table from the start of the file. */
20698 val = MAYBE_SWAP (total_len);
20699 obstack_grow (&contents, &val, sizeof (val));
20700 total_len += obstack_object_size (&symtab_obstack);
20702 /* The offset of the constant pool from the start of the file. */
20703 val = MAYBE_SWAP (total_len);
20704 obstack_grow (&contents, &val, sizeof (val));
20705 total_len += obstack_object_size (&constant_pool);
20707 gdb_assert (obstack_object_size (&contents) == size_of_contents);
20709 write_obstack (out_file, &contents);
20710 write_obstack (out_file, &cu_list);
20711 write_obstack (out_file, &types_cu_list);
20712 write_obstack (out_file, &addr_obstack);
20713 write_obstack (out_file, &symtab_obstack);
20714 write_obstack (out_file, &constant_pool);
20718 /* We want to keep the file, so we set cleanup_filename to NULL
20719 here. See unlink_if_set. */
20720 cleanup_filename = NULL;
20722 do_cleanups (cleanup);
20725 /* Implementation of the `save gdb-index' command.
20727 Note that the file format used by this command is documented in the
20728 GDB manual. Any changes here must be documented there. */
20731 save_gdb_index_command (char *arg, int from_tty)
20733 struct objfile *objfile;
20736 error (_("usage: save gdb-index DIRECTORY"));
20738 ALL_OBJFILES (objfile)
20742 /* If the objfile does not correspond to an actual file, skip it. */
20743 if (stat (objfile->name, &st) < 0)
20746 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20747 if (dwarf2_per_objfile)
20749 volatile struct gdb_exception except;
20751 TRY_CATCH (except, RETURN_MASK_ERROR)
20753 write_psymtabs_to_index (objfile, arg);
20755 if (except.reason < 0)
20756 exception_fprintf (gdb_stderr, except,
20757 _("Error while writing index for `%s': "),
20765 int dwarf2_always_disassemble;
20768 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
20769 struct cmd_list_element *c, const char *value)
20771 fprintf_filtered (file,
20772 _("Whether to always disassemble "
20773 "DWARF expressions is %s.\n"),
20778 show_check_physname (struct ui_file *file, int from_tty,
20779 struct cmd_list_element *c, const char *value)
20781 fprintf_filtered (file,
20782 _("Whether to check \"physname\" is %s.\n"),
20786 void _initialize_dwarf2_read (void);
20789 _initialize_dwarf2_read (void)
20791 struct cmd_list_element *c;
20793 dwarf2_objfile_data_key
20794 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
20796 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
20797 Set DWARF 2 specific variables.\n\
20798 Configure DWARF 2 variables such as the cache size"),
20799 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
20800 0/*allow-unknown*/, &maintenance_set_cmdlist);
20802 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
20803 Show DWARF 2 specific variables\n\
20804 Show DWARF 2 variables such as the cache size"),
20805 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
20806 0/*allow-unknown*/, &maintenance_show_cmdlist);
20808 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
20809 &dwarf2_max_cache_age, _("\
20810 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
20811 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
20812 A higher limit means that cached compilation units will be stored\n\
20813 in memory longer, and more total memory will be used. Zero disables\n\
20814 caching, which can slow down startup."),
20816 show_dwarf2_max_cache_age,
20817 &set_dwarf2_cmdlist,
20818 &show_dwarf2_cmdlist);
20820 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
20821 &dwarf2_always_disassemble, _("\
20822 Set whether `info address' always disassembles DWARF expressions."), _("\
20823 Show whether `info address' always disassembles DWARF expressions."), _("\
20824 When enabled, DWARF expressions are always printed in an assembly-like\n\
20825 syntax. When disabled, expressions will be printed in a more\n\
20826 conversational style, when possible."),
20828 show_dwarf2_always_disassemble,
20829 &set_dwarf2_cmdlist,
20830 &show_dwarf2_cmdlist);
20832 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
20833 Set debugging of the dwarf2 reader."), _("\
20834 Show debugging of the dwarf2 reader."), _("\
20835 When enabled, debugging messages are printed during dwarf2 reading\n\
20836 and symtab expansion."),
20839 &setdebuglist, &showdebuglist);
20841 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
20842 Set debugging of the dwarf2 DIE reader."), _("\
20843 Show debugging of the dwarf2 DIE reader."), _("\
20844 When enabled (non-zero), DIEs are dumped after they are read in.\n\
20845 The value is the maximum depth to print."),
20848 &setdebuglist, &showdebuglist);
20850 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
20851 Set cross-checking of \"physname\" code against demangler."), _("\
20852 Show cross-checking of \"physname\" code against demangler."), _("\
20853 When enabled, GDB's internal \"physname\" code is checked against\n\
20855 NULL, show_check_physname,
20856 &setdebuglist, &showdebuglist);
20858 add_setshow_boolean_cmd ("use-deprecated-index-sections",
20859 no_class, &use_deprecated_index_sections, _("\
20860 Set whether to use deprecated gdb_index sections."), _("\
20861 Show whether to use deprecated gdb_index sections."), _("\
20862 When enabled, deprecated .gdb_index sections are used anyway.\n\
20863 Normally they are ignored either because of a missing feature or\n\
20864 performance issue.\n\
20865 Warning: This option must be enabled before gdb reads the file."),
20868 &setlist, &showlist);
20870 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
20872 Save a gdb-index file.\n\
20873 Usage: save gdb-index DIRECTORY"),
20875 set_cmd_completer (c, filename_completer);
20877 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
20878 &dwarf2_locexpr_funcs);
20879 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
20880 &dwarf2_loclist_funcs);
20882 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
20883 &dwarf2_block_frame_base_locexpr_funcs);
20884 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
20885 &dwarf2_block_frame_base_loclist_funcs);