1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2017 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 "completer.h"
63 #include "gdbcore.h" /* for gnutarget */
64 #include "gdb/gdb-index.h"
69 #include "filestuff.h"
71 #include "namespace.h"
72 #include "common/gdb_unlinker.h"
73 #include "common/function-view.h"
74 #include "common/gdb_optional.h"
75 #include "common/underlying.h"
76 #include "common/byte-vector.h"
79 #include <sys/types.h>
81 #include <unordered_set>
82 #include <unordered_map>
84 typedef struct symbol *symbolp;
87 /* When == 1, print basic high level tracing messages.
88 When > 1, be more verbose.
89 This is in contrast to the low level DIE reading of dwarf_die_debug. */
90 static unsigned int dwarf_read_debug = 0;
92 /* When non-zero, dump DIEs after they are read in. */
93 static unsigned int dwarf_die_debug = 0;
95 /* When non-zero, dump line number entries as they are read in. */
96 static unsigned int dwarf_line_debug = 0;
98 /* When non-zero, cross-check physname against demangler. */
99 static int check_physname = 0;
101 /* When non-zero, do not reject deprecated .gdb_index sections. */
102 static int use_deprecated_index_sections = 0;
104 static const struct objfile_data *dwarf2_objfile_data_key;
106 /* The "aclass" indices for various kinds of computed DWARF symbols. */
108 static int dwarf2_locexpr_index;
109 static int dwarf2_loclist_index;
110 static int dwarf2_locexpr_block_index;
111 static int dwarf2_loclist_block_index;
113 /* A descriptor for dwarf sections.
115 S.ASECTION, SIZE are typically initialized when the objfile is first
116 scanned. BUFFER, READIN are filled in later when the section is read.
117 If the section contained compressed data then SIZE is updated to record
118 the uncompressed size of the section.
120 DWP file format V2 introduces a wrinkle that is easiest to handle by
121 creating the concept of virtual sections contained within a real section.
122 In DWP V2 the sections of the input DWO files are concatenated together
123 into one section, but section offsets are kept relative to the original
125 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
126 the real section this "virtual" section is contained in, and BUFFER,SIZE
127 describe the virtual section. */
129 struct dwarf2_section_info
133 /* If this is a real section, the bfd section. */
135 /* If this is a virtual section, pointer to the containing ("real")
137 struct dwarf2_section_info *containing_section;
139 /* Pointer to section data, only valid if readin. */
140 const gdb_byte *buffer;
141 /* The size of the section, real or virtual. */
143 /* If this is a virtual section, the offset in the real section.
144 Only valid if is_virtual. */
145 bfd_size_type virtual_offset;
146 /* True if we have tried to read this section. */
148 /* True if this is a virtual section, False otherwise.
149 This specifies which of s.section and s.containing_section to use. */
153 typedef struct dwarf2_section_info dwarf2_section_info_def;
154 DEF_VEC_O (dwarf2_section_info_def);
156 /* All offsets in the index are of this type. It must be
157 architecture-independent. */
158 typedef uint32_t offset_type;
160 DEF_VEC_I (offset_type);
162 /* Ensure only legit values are used. */
163 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
165 gdb_assert ((unsigned int) (value) <= 1); \
166 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
169 /* Ensure only legit values are used. */
170 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
172 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
173 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
174 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
177 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
178 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
180 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
181 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
184 /* A description of the mapped index. The file format is described in
185 a comment by the code that writes the index. */
188 /* Index data format version. */
191 /* The total length of the buffer. */
194 /* A pointer to the address table data. */
195 const gdb_byte *address_table;
197 /* Size of the address table data in bytes. */
198 offset_type address_table_size;
200 /* The symbol table, implemented as a hash table. */
201 const offset_type *symbol_table;
203 /* Size in slots, each slot is 2 offset_types. */
204 offset_type symbol_table_slots;
206 /* A pointer to the constant pool. */
207 const char *constant_pool;
210 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
211 DEF_VEC_P (dwarf2_per_cu_ptr);
215 int nr_uniq_abbrev_tables;
217 int nr_symtab_sharers;
218 int nr_stmt_less_type_units;
219 int nr_all_type_units_reallocs;
222 /* Collection of data recorded per objfile.
223 This hangs off of dwarf2_objfile_data_key. */
225 struct dwarf2_per_objfile
227 struct dwarf2_section_info info;
228 struct dwarf2_section_info abbrev;
229 struct dwarf2_section_info line;
230 struct dwarf2_section_info loc;
231 struct dwarf2_section_info loclists;
232 struct dwarf2_section_info macinfo;
233 struct dwarf2_section_info macro;
234 struct dwarf2_section_info str;
235 struct dwarf2_section_info line_str;
236 struct dwarf2_section_info ranges;
237 struct dwarf2_section_info rnglists;
238 struct dwarf2_section_info addr;
239 struct dwarf2_section_info frame;
240 struct dwarf2_section_info eh_frame;
241 struct dwarf2_section_info gdb_index;
243 VEC (dwarf2_section_info_def) *types;
246 struct objfile *objfile;
248 /* Table of all the compilation units. This is used to locate
249 the target compilation unit of a particular reference. */
250 struct dwarf2_per_cu_data **all_comp_units;
252 /* The number of compilation units in ALL_COMP_UNITS. */
255 /* The number of .debug_types-related CUs. */
258 /* The number of elements allocated in all_type_units.
259 If there are skeleton-less TUs, we add them to all_type_units lazily. */
260 int n_allocated_type_units;
262 /* The .debug_types-related CUs (TUs).
263 This is stored in malloc space because we may realloc it. */
264 struct signatured_type **all_type_units;
266 /* Table of struct type_unit_group objects.
267 The hash key is the DW_AT_stmt_list value. */
268 htab_t type_unit_groups;
270 /* A table mapping .debug_types signatures to its signatured_type entry.
271 This is NULL if the .debug_types section hasn't been read in yet. */
272 htab_t signatured_types;
274 /* Type unit statistics, to see how well the scaling improvements
276 struct tu_stats tu_stats;
278 /* A chain of compilation units that are currently read in, so that
279 they can be freed later. */
280 struct dwarf2_per_cu_data *read_in_chain;
282 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
283 This is NULL if the table hasn't been allocated yet. */
286 /* Non-zero if we've check for whether there is a DWP file. */
289 /* The DWP file if there is one, or NULL. */
290 struct dwp_file *dwp_file;
292 /* The shared '.dwz' file, if one exists. This is used when the
293 original data was compressed using 'dwz -m'. */
294 struct dwz_file *dwz_file;
296 /* A flag indicating wether this objfile has a section loaded at a
298 int has_section_at_zero;
300 /* True if we are using the mapped index,
301 or we are faking it for OBJF_READNOW's sake. */
302 unsigned char using_index;
304 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
305 struct mapped_index *index_table;
307 /* When using index_table, this keeps track of all quick_file_names entries.
308 TUs typically share line table entries with a CU, so we maintain a
309 separate table of all line table entries to support the sharing.
310 Note that while there can be way more TUs than CUs, we've already
311 sorted all the TUs into "type unit groups", grouped by their
312 DW_AT_stmt_list value. Therefore the only sharing done here is with a
313 CU and its associated TU group if there is one. */
314 htab_t quick_file_names_table;
316 /* Set during partial symbol reading, to prevent queueing of full
318 int reading_partial_symbols;
320 /* Table mapping type DIEs to their struct type *.
321 This is NULL if not allocated yet.
322 The mapping is done via (CU/TU + DIE offset) -> type. */
323 htab_t die_type_hash;
325 /* The CUs we recently read. */
326 VEC (dwarf2_per_cu_ptr) *just_read_cus;
328 /* Table containing line_header indexed by offset and offset_in_dwz. */
329 htab_t line_header_hash;
332 static struct dwarf2_per_objfile *dwarf2_per_objfile;
334 /* Default names of the debugging sections. */
336 /* Note that if the debugging section has been compressed, it might
337 have a name like .zdebug_info. */
339 static const struct dwarf2_debug_sections dwarf2_elf_names =
341 { ".debug_info", ".zdebug_info" },
342 { ".debug_abbrev", ".zdebug_abbrev" },
343 { ".debug_line", ".zdebug_line" },
344 { ".debug_loc", ".zdebug_loc" },
345 { ".debug_loclists", ".zdebug_loclists" },
346 { ".debug_macinfo", ".zdebug_macinfo" },
347 { ".debug_macro", ".zdebug_macro" },
348 { ".debug_str", ".zdebug_str" },
349 { ".debug_line_str", ".zdebug_line_str" },
350 { ".debug_ranges", ".zdebug_ranges" },
351 { ".debug_rnglists", ".zdebug_rnglists" },
352 { ".debug_types", ".zdebug_types" },
353 { ".debug_addr", ".zdebug_addr" },
354 { ".debug_frame", ".zdebug_frame" },
355 { ".eh_frame", NULL },
356 { ".gdb_index", ".zgdb_index" },
360 /* List of DWO/DWP sections. */
362 static const struct dwop_section_names
364 struct dwarf2_section_names abbrev_dwo;
365 struct dwarf2_section_names info_dwo;
366 struct dwarf2_section_names line_dwo;
367 struct dwarf2_section_names loc_dwo;
368 struct dwarf2_section_names loclists_dwo;
369 struct dwarf2_section_names macinfo_dwo;
370 struct dwarf2_section_names macro_dwo;
371 struct dwarf2_section_names str_dwo;
372 struct dwarf2_section_names str_offsets_dwo;
373 struct dwarf2_section_names types_dwo;
374 struct dwarf2_section_names cu_index;
375 struct dwarf2_section_names tu_index;
379 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
380 { ".debug_info.dwo", ".zdebug_info.dwo" },
381 { ".debug_line.dwo", ".zdebug_line.dwo" },
382 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
383 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
384 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
385 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
386 { ".debug_str.dwo", ".zdebug_str.dwo" },
387 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
388 { ".debug_types.dwo", ".zdebug_types.dwo" },
389 { ".debug_cu_index", ".zdebug_cu_index" },
390 { ".debug_tu_index", ".zdebug_tu_index" },
393 /* local data types */
395 /* The data in a compilation unit header, after target2host
396 translation, looks like this. */
397 struct comp_unit_head
401 unsigned char addr_size;
402 unsigned char signed_addr_p;
403 sect_offset abbrev_sect_off;
405 /* Size of file offsets; either 4 or 8. */
406 unsigned int offset_size;
408 /* Size of the length field; either 4 or 12. */
409 unsigned int initial_length_size;
411 enum dwarf_unit_type unit_type;
413 /* Offset to the first byte of this compilation unit header in the
414 .debug_info section, for resolving relative reference dies. */
415 sect_offset sect_off;
417 /* Offset to first die in this cu from the start of the cu.
418 This will be the first byte following the compilation unit header. */
419 cu_offset first_die_cu_offset;
421 /* 64-bit signature of this type unit - it is valid only for
422 UNIT_TYPE DW_UT_type. */
425 /* For types, offset in the type's DIE of the type defined by this TU. */
426 cu_offset type_cu_offset_in_tu;
429 /* Type used for delaying computation of method physnames.
430 See comments for compute_delayed_physnames. */
431 struct delayed_method_info
433 /* The type to which the method is attached, i.e., its parent class. */
436 /* The index of the method in the type's function fieldlists. */
439 /* The index of the method in the fieldlist. */
442 /* The name of the DIE. */
445 /* The DIE associated with this method. */
446 struct die_info *die;
449 typedef struct delayed_method_info delayed_method_info;
450 DEF_VEC_O (delayed_method_info);
452 /* Internal state when decoding a particular compilation unit. */
455 /* The objfile containing this compilation unit. */
456 struct objfile *objfile;
458 /* The header of the compilation unit. */
459 struct comp_unit_head header;
461 /* Base address of this compilation unit. */
462 CORE_ADDR base_address;
464 /* Non-zero if base_address has been set. */
467 /* The language we are debugging. */
468 enum language language;
469 const struct language_defn *language_defn;
471 const char *producer;
473 /* The generic symbol table building routines have separate lists for
474 file scope symbols and all all other scopes (local scopes). So
475 we need to select the right one to pass to add_symbol_to_list().
476 We do it by keeping a pointer to the correct list in list_in_scope.
478 FIXME: The original dwarf code just treated the file scope as the
479 first local scope, and all other local scopes as nested local
480 scopes, and worked fine. Check to see if we really need to
481 distinguish these in buildsym.c. */
482 struct pending **list_in_scope;
484 /* The abbrev table for this CU.
485 Normally this points to the abbrev table in the objfile.
486 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
487 struct abbrev_table *abbrev_table;
489 /* Hash table holding all the loaded partial DIEs
490 with partial_die->offset.SECT_OFF as hash. */
493 /* Storage for things with the same lifetime as this read-in compilation
494 unit, including partial DIEs. */
495 struct obstack comp_unit_obstack;
497 /* When multiple dwarf2_cu structures are living in memory, this field
498 chains them all together, so that they can be released efficiently.
499 We will probably also want a generation counter so that most-recently-used
500 compilation units are cached... */
501 struct dwarf2_per_cu_data *read_in_chain;
503 /* Backlink to our per_cu entry. */
504 struct dwarf2_per_cu_data *per_cu;
506 /* How many compilation units ago was this CU last referenced? */
509 /* A hash table of DIE cu_offset for following references with
510 die_info->offset.sect_off as hash. */
513 /* Full DIEs if read in. */
514 struct die_info *dies;
516 /* A set of pointers to dwarf2_per_cu_data objects for compilation
517 units referenced by this one. Only set during full symbol processing;
518 partial symbol tables do not have dependencies. */
521 /* Header data from the line table, during full symbol processing. */
522 struct line_header *line_header;
524 /* A list of methods which need to have physnames computed
525 after all type information has been read. */
526 VEC (delayed_method_info) *method_list;
528 /* To be copied to symtab->call_site_htab. */
529 htab_t call_site_htab;
531 /* Non-NULL if this CU came from a DWO file.
532 There is an invariant here that is important to remember:
533 Except for attributes copied from the top level DIE in the "main"
534 (or "stub") file in preparation for reading the DWO file
535 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
536 Either there isn't a DWO file (in which case this is NULL and the point
537 is moot), or there is and either we're not going to read it (in which
538 case this is NULL) or there is and we are reading it (in which case this
540 struct dwo_unit *dwo_unit;
542 /* The DW_AT_addr_base attribute if present, zero otherwise
543 (zero is a valid value though).
544 Note this value comes from the Fission stub CU/TU's DIE. */
547 /* The DW_AT_ranges_base attribute if present, zero otherwise
548 (zero is a valid value though).
549 Note this value comes from the Fission stub CU/TU's DIE.
550 Also note that the value is zero in the non-DWO case so this value can
551 be used without needing to know whether DWO files are in use or not.
552 N.B. This does not apply to DW_AT_ranges appearing in
553 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
554 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
555 DW_AT_ranges_base *would* have to be applied, and we'd have to care
556 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
557 ULONGEST ranges_base;
559 /* Mark used when releasing cached dies. */
560 unsigned int mark : 1;
562 /* This CU references .debug_loc. See the symtab->locations_valid field.
563 This test is imperfect as there may exist optimized debug code not using
564 any location list and still facing inlining issues if handled as
565 unoptimized code. For a future better test see GCC PR other/32998. */
566 unsigned int has_loclist : 1;
568 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
569 if all the producer_is_* fields are valid. This information is cached
570 because profiling CU expansion showed excessive time spent in
571 producer_is_gxx_lt_4_6. */
572 unsigned int checked_producer : 1;
573 unsigned int producer_is_gxx_lt_4_6 : 1;
574 unsigned int producer_is_gcc_lt_4_3 : 1;
575 unsigned int producer_is_icc : 1;
577 /* When set, the file that we're processing is known to have
578 debugging info for C++ namespaces. GCC 3.3.x did not produce
579 this information, but later versions do. */
581 unsigned int processing_has_namespace_info : 1;
584 /* Persistent data held for a compilation unit, even when not
585 processing it. We put a pointer to this structure in the
586 read_symtab_private field of the psymtab. */
588 struct dwarf2_per_cu_data
590 /* The start offset and length of this compilation unit.
591 NOTE: Unlike comp_unit_head.length, this length includes
593 If the DIE refers to a DWO file, this is always of the original die,
595 sect_offset sect_off;
598 /* DWARF standard version this data has been read from (such as 4 or 5). */
601 /* Flag indicating this compilation unit will be read in before
602 any of the current compilation units are processed. */
603 unsigned int queued : 1;
605 /* This flag will be set when reading partial DIEs if we need to load
606 absolutely all DIEs for this compilation unit, instead of just the ones
607 we think are interesting. It gets set if we look for a DIE in the
608 hash table and don't find it. */
609 unsigned int load_all_dies : 1;
611 /* Non-zero if this CU is from .debug_types.
612 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
614 unsigned int is_debug_types : 1;
616 /* Non-zero if this CU is from the .dwz file. */
617 unsigned int is_dwz : 1;
619 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
620 This flag is only valid if is_debug_types is true.
621 We can't read a CU directly from a DWO file: There are required
622 attributes in the stub. */
623 unsigned int reading_dwo_directly : 1;
625 /* Non-zero if the TU has been read.
626 This is used to assist the "Stay in DWO Optimization" for Fission:
627 When reading a DWO, it's faster to read TUs from the DWO instead of
628 fetching them from random other DWOs (due to comdat folding).
629 If the TU has already been read, the optimization is unnecessary
630 (and unwise - we don't want to change where gdb thinks the TU lives
632 This flag is only valid if is_debug_types is true. */
633 unsigned int tu_read : 1;
635 /* The section this CU/TU lives in.
636 If the DIE refers to a DWO file, this is always the original die,
638 struct dwarf2_section_info *section;
640 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
641 of the CU cache it gets reset to NULL again. This is left as NULL for
642 dummy CUs (a CU header, but nothing else). */
643 struct dwarf2_cu *cu;
645 /* The corresponding objfile.
646 Normally we can get the objfile from dwarf2_per_objfile.
647 However we can enter this file with just a "per_cu" handle. */
648 struct objfile *objfile;
650 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
651 is active. Otherwise, the 'psymtab' field is active. */
654 /* The partial symbol table associated with this compilation unit,
655 or NULL for unread partial units. */
656 struct partial_symtab *psymtab;
658 /* Data needed by the "quick" functions. */
659 struct dwarf2_per_cu_quick_data *quick;
662 /* The CUs we import using DW_TAG_imported_unit. This is filled in
663 while reading psymtabs, used to compute the psymtab dependencies,
664 and then cleared. Then it is filled in again while reading full
665 symbols, and only deleted when the objfile is destroyed.
667 This is also used to work around a difference between the way gold
668 generates .gdb_index version <=7 and the way gdb does. Arguably this
669 is a gold bug. For symbols coming from TUs, gold records in the index
670 the CU that includes the TU instead of the TU itself. This breaks
671 dw2_lookup_symbol: It assumes that if the index says symbol X lives
672 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
673 will find X. Alas TUs live in their own symtab, so after expanding CU Y
674 we need to look in TU Z to find X. Fortunately, this is akin to
675 DW_TAG_imported_unit, so we just use the same mechanism: For
676 .gdb_index version <=7 this also records the TUs that the CU referred
677 to. Concurrently with this change gdb was modified to emit version 8
678 indices so we only pay a price for gold generated indices.
679 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
680 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
683 /* Entry in the signatured_types hash table. */
685 struct signatured_type
687 /* The "per_cu" object of this type.
688 This struct is used iff per_cu.is_debug_types.
689 N.B.: This is the first member so that it's easy to convert pointers
691 struct dwarf2_per_cu_data per_cu;
693 /* The type's signature. */
696 /* Offset in the TU of the type's DIE, as read from the TU header.
697 If this TU is a DWO stub and the definition lives in a DWO file
698 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
699 cu_offset type_offset_in_tu;
701 /* Offset in the section of the type's DIE.
702 If the definition lives in a DWO file, this is the offset in the
703 .debug_types.dwo section.
704 The value is zero until the actual value is known.
705 Zero is otherwise not a valid section offset. */
706 sect_offset type_offset_in_section;
708 /* Type units are grouped by their DW_AT_stmt_list entry so that they
709 can share them. This points to the containing symtab. */
710 struct type_unit_group *type_unit_group;
713 The first time we encounter this type we fully read it in and install it
714 in the symbol tables. Subsequent times we only need the type. */
717 /* Containing DWO unit.
718 This field is valid iff per_cu.reading_dwo_directly. */
719 struct dwo_unit *dwo_unit;
722 typedef struct signatured_type *sig_type_ptr;
723 DEF_VEC_P (sig_type_ptr);
725 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
726 This includes type_unit_group and quick_file_names. */
728 struct stmt_list_hash
730 /* The DWO unit this table is from or NULL if there is none. */
731 struct dwo_unit *dwo_unit;
733 /* Offset in .debug_line or .debug_line.dwo. */
734 sect_offset line_sect_off;
737 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
738 an object of this type. */
740 struct type_unit_group
742 /* dwarf2read.c's main "handle" on a TU symtab.
743 To simplify things we create an artificial CU that "includes" all the
744 type units using this stmt_list so that the rest of the code still has
745 a "per_cu" handle on the symtab.
746 This PER_CU is recognized by having no section. */
747 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
748 struct dwarf2_per_cu_data per_cu;
750 /* The TUs that share this DW_AT_stmt_list entry.
751 This is added to while parsing type units to build partial symtabs,
752 and is deleted afterwards and not used again. */
753 VEC (sig_type_ptr) *tus;
755 /* The compunit symtab.
756 Type units in a group needn't all be defined in the same source file,
757 so we create an essentially anonymous symtab as the compunit symtab. */
758 struct compunit_symtab *compunit_symtab;
760 /* The data used to construct the hash key. */
761 struct stmt_list_hash hash;
763 /* The number of symtabs from the line header.
764 The value here must match line_header.num_file_names. */
765 unsigned int num_symtabs;
767 /* The symbol tables for this TU (obtained from the files listed in
769 WARNING: The order of entries here must match the order of entries
770 in the line header. After the first TU using this type_unit_group, the
771 line header for the subsequent TUs is recreated from this. This is done
772 because we need to use the same symtabs for each TU using the same
773 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
774 there's no guarantee the line header doesn't have duplicate entries. */
775 struct symtab **symtabs;
778 /* These sections are what may appear in a (real or virtual) DWO file. */
782 struct dwarf2_section_info abbrev;
783 struct dwarf2_section_info line;
784 struct dwarf2_section_info loc;
785 struct dwarf2_section_info loclists;
786 struct dwarf2_section_info macinfo;
787 struct dwarf2_section_info macro;
788 struct dwarf2_section_info str;
789 struct dwarf2_section_info str_offsets;
790 /* In the case of a virtual DWO file, these two are unused. */
791 struct dwarf2_section_info info;
792 VEC (dwarf2_section_info_def) *types;
795 /* CUs/TUs in DWP/DWO files. */
799 /* Backlink to the containing struct dwo_file. */
800 struct dwo_file *dwo_file;
802 /* The "id" that distinguishes this CU/TU.
803 .debug_info calls this "dwo_id", .debug_types calls this "signature".
804 Since signatures came first, we stick with it for consistency. */
807 /* The section this CU/TU lives in, in the DWO file. */
808 struct dwarf2_section_info *section;
810 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
811 sect_offset sect_off;
814 /* For types, offset in the type's DIE of the type defined by this TU. */
815 cu_offset type_offset_in_tu;
818 /* include/dwarf2.h defines the DWP section codes.
819 It defines a max value but it doesn't define a min value, which we
820 use for error checking, so provide one. */
822 enum dwp_v2_section_ids
827 /* Data for one DWO file.
829 This includes virtual DWO files (a virtual DWO file is a DWO file as it
830 appears in a DWP file). DWP files don't really have DWO files per se -
831 comdat folding of types "loses" the DWO file they came from, and from
832 a high level view DWP files appear to contain a mass of random types.
833 However, to maintain consistency with the non-DWP case we pretend DWP
834 files contain virtual DWO files, and we assign each TU with one virtual
835 DWO file (generally based on the line and abbrev section offsets -
836 a heuristic that seems to work in practice). */
840 /* The DW_AT_GNU_dwo_name attribute.
841 For virtual DWO files the name is constructed from the section offsets
842 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
843 from related CU+TUs. */
844 const char *dwo_name;
846 /* The DW_AT_comp_dir attribute. */
847 const char *comp_dir;
849 /* The bfd, when the file is open. Otherwise this is NULL.
850 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
853 /* The sections that make up this DWO file.
854 Remember that for virtual DWO files in DWP V2, these are virtual
855 sections (for lack of a better name). */
856 struct dwo_sections sections;
858 /* The CU in the file.
859 We only support one because having more than one requires hacking the
860 dwo_name of each to match, which is highly unlikely to happen.
861 Doing this means all TUs can share comp_dir: We also assume that
862 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
865 /* Table of TUs in the file.
866 Each element is a struct dwo_unit. */
870 /* These sections are what may appear in a DWP file. */
874 /* These are used by both DWP version 1 and 2. */
875 struct dwarf2_section_info str;
876 struct dwarf2_section_info cu_index;
877 struct dwarf2_section_info tu_index;
879 /* These are only used by DWP version 2 files.
880 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
881 sections are referenced by section number, and are not recorded here.
882 In DWP version 2 there is at most one copy of all these sections, each
883 section being (effectively) comprised of the concatenation of all of the
884 individual sections that exist in the version 1 format.
885 To keep the code simple we treat each of these concatenated pieces as a
886 section itself (a virtual section?). */
887 struct dwarf2_section_info abbrev;
888 struct dwarf2_section_info info;
889 struct dwarf2_section_info line;
890 struct dwarf2_section_info loc;
891 struct dwarf2_section_info macinfo;
892 struct dwarf2_section_info macro;
893 struct dwarf2_section_info str_offsets;
894 struct dwarf2_section_info types;
897 /* These sections are what may appear in a virtual DWO file in DWP version 1.
898 A virtual DWO file is a DWO file as it appears in a DWP file. */
900 struct virtual_v1_dwo_sections
902 struct dwarf2_section_info abbrev;
903 struct dwarf2_section_info line;
904 struct dwarf2_section_info loc;
905 struct dwarf2_section_info macinfo;
906 struct dwarf2_section_info macro;
907 struct dwarf2_section_info str_offsets;
908 /* Each DWP hash table entry records one CU or one TU.
909 That is recorded here, and copied to dwo_unit.section. */
910 struct dwarf2_section_info info_or_types;
913 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
914 In version 2, the sections of the DWO files are concatenated together
915 and stored in one section of that name. Thus each ELF section contains
916 several "virtual" sections. */
918 struct virtual_v2_dwo_sections
920 bfd_size_type abbrev_offset;
921 bfd_size_type abbrev_size;
923 bfd_size_type line_offset;
924 bfd_size_type line_size;
926 bfd_size_type loc_offset;
927 bfd_size_type loc_size;
929 bfd_size_type macinfo_offset;
930 bfd_size_type macinfo_size;
932 bfd_size_type macro_offset;
933 bfd_size_type macro_size;
935 bfd_size_type str_offsets_offset;
936 bfd_size_type str_offsets_size;
938 /* Each DWP hash table entry records one CU or one TU.
939 That is recorded here, and copied to dwo_unit.section. */
940 bfd_size_type info_or_types_offset;
941 bfd_size_type info_or_types_size;
944 /* Contents of DWP hash tables. */
946 struct dwp_hash_table
948 uint32_t version, nr_columns;
949 uint32_t nr_units, nr_slots;
950 const gdb_byte *hash_table, *unit_table;
955 const gdb_byte *indices;
959 /* This is indexed by column number and gives the id of the section
961 #define MAX_NR_V2_DWO_SECTIONS \
962 (1 /* .debug_info or .debug_types */ \
963 + 1 /* .debug_abbrev */ \
964 + 1 /* .debug_line */ \
965 + 1 /* .debug_loc */ \
966 + 1 /* .debug_str_offsets */ \
967 + 1 /* .debug_macro or .debug_macinfo */)
968 int section_ids[MAX_NR_V2_DWO_SECTIONS];
969 const gdb_byte *offsets;
970 const gdb_byte *sizes;
975 /* Data for one DWP file. */
979 /* Name of the file. */
982 /* File format version. */
988 /* Section info for this file. */
989 struct dwp_sections sections;
991 /* Table of CUs in the file. */
992 const struct dwp_hash_table *cus;
994 /* Table of TUs in the file. */
995 const struct dwp_hash_table *tus;
997 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1001 /* Table to map ELF section numbers to their sections.
1002 This is only needed for the DWP V1 file format. */
1003 unsigned int num_sections;
1004 asection **elf_sections;
1007 /* This represents a '.dwz' file. */
1011 /* A dwz file can only contain a few sections. */
1012 struct dwarf2_section_info abbrev;
1013 struct dwarf2_section_info info;
1014 struct dwarf2_section_info str;
1015 struct dwarf2_section_info line;
1016 struct dwarf2_section_info macro;
1017 struct dwarf2_section_info gdb_index;
1019 /* The dwz's BFD. */
1023 /* Struct used to pass misc. parameters to read_die_and_children, et
1024 al. which are used for both .debug_info and .debug_types dies.
1025 All parameters here are unchanging for the life of the call. This
1026 struct exists to abstract away the constant parameters of die reading. */
1028 struct die_reader_specs
1030 /* The bfd of die_section. */
1033 /* The CU of the DIE we are parsing. */
1034 struct dwarf2_cu *cu;
1036 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1037 struct dwo_file *dwo_file;
1039 /* The section the die comes from.
1040 This is either .debug_info or .debug_types, or the .dwo variants. */
1041 struct dwarf2_section_info *die_section;
1043 /* die_section->buffer. */
1044 const gdb_byte *buffer;
1046 /* The end of the buffer. */
1047 const gdb_byte *buffer_end;
1049 /* The value of the DW_AT_comp_dir attribute. */
1050 const char *comp_dir;
1053 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1054 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1055 const gdb_byte *info_ptr,
1056 struct die_info *comp_unit_die,
1060 /* A 1-based directory index. This is a strong typedef to prevent
1061 accidentally using a directory index as a 0-based index into an
1063 enum class dir_index : unsigned int {};
1065 /* Likewise, a 1-based file name index. */
1066 enum class file_name_index : unsigned int {};
1070 file_entry () = default;
1072 file_entry (const char *name_, dir_index d_index_,
1073 unsigned int mod_time_, unsigned int length_)
1076 mod_time (mod_time_),
1080 /* Return the include directory at D_INDEX stored in LH. Returns
1081 NULL if D_INDEX is out of bounds. */
1082 const char *include_dir (const line_header *lh) const;
1084 /* The file name. Note this is an observing pointer. The memory is
1085 owned by debug_line_buffer. */
1086 const char *name {};
1088 /* The directory index (1-based). */
1089 dir_index d_index {};
1091 unsigned int mod_time {};
1093 unsigned int length {};
1095 /* True if referenced by the Line Number Program. */
1098 /* The associated symbol table, if any. */
1099 struct symtab *symtab {};
1102 /* The line number information for a compilation unit (found in the
1103 .debug_line section) begins with a "statement program header",
1104 which contains the following information. */
1111 /* Add an entry to the include directory table. */
1112 void add_include_dir (const char *include_dir);
1114 /* Add an entry to the file name table. */
1115 void add_file_name (const char *name, dir_index d_index,
1116 unsigned int mod_time, unsigned int length);
1118 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1119 is out of bounds. */
1120 const char *include_dir_at (dir_index index) const
1122 /* Convert directory index number (1-based) to vector index
1124 size_t vec_index = to_underlying (index) - 1;
1126 if (vec_index >= include_dirs.size ())
1128 return include_dirs[vec_index];
1131 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1132 is out of bounds. */
1133 file_entry *file_name_at (file_name_index index)
1135 /* Convert file name index number (1-based) to vector index
1137 size_t vec_index = to_underlying (index) - 1;
1139 if (vec_index >= file_names.size ())
1141 return &file_names[vec_index];
1144 /* Const version of the above. */
1145 const file_entry *file_name_at (unsigned int index) const
1147 if (index >= file_names.size ())
1149 return &file_names[index];
1152 /* Offset of line number information in .debug_line section. */
1153 sect_offset sect_off {};
1155 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1156 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1158 unsigned int total_length {};
1159 unsigned short version {};
1160 unsigned int header_length {};
1161 unsigned char minimum_instruction_length {};
1162 unsigned char maximum_ops_per_instruction {};
1163 unsigned char default_is_stmt {};
1165 unsigned char line_range {};
1166 unsigned char opcode_base {};
1168 /* standard_opcode_lengths[i] is the number of operands for the
1169 standard opcode whose value is i. This means that
1170 standard_opcode_lengths[0] is unused, and the last meaningful
1171 element is standard_opcode_lengths[opcode_base - 1]. */
1172 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1174 /* The include_directories table. Note these are observing
1175 pointers. The memory is owned by debug_line_buffer. */
1176 std::vector<const char *> include_dirs;
1178 /* The file_names table. */
1179 std::vector<file_entry> file_names;
1181 /* The start and end of the statement program following this
1182 header. These point into dwarf2_per_objfile->line_buffer. */
1183 const gdb_byte *statement_program_start {}, *statement_program_end {};
1186 typedef std::unique_ptr<line_header> line_header_up;
1189 file_entry::include_dir (const line_header *lh) const
1191 return lh->include_dir_at (d_index);
1194 /* When we construct a partial symbol table entry we only
1195 need this much information. */
1196 struct partial_die_info
1198 /* Offset of this DIE. */
1199 sect_offset sect_off;
1201 /* DWARF-2 tag for this DIE. */
1202 ENUM_BITFIELD(dwarf_tag) tag : 16;
1204 /* Assorted flags describing the data found in this DIE. */
1205 unsigned int has_children : 1;
1206 unsigned int is_external : 1;
1207 unsigned int is_declaration : 1;
1208 unsigned int has_type : 1;
1209 unsigned int has_specification : 1;
1210 unsigned int has_pc_info : 1;
1211 unsigned int may_be_inlined : 1;
1213 /* This DIE has been marked DW_AT_main_subprogram. */
1214 unsigned int main_subprogram : 1;
1216 /* Flag set if the SCOPE field of this structure has been
1218 unsigned int scope_set : 1;
1220 /* Flag set if the DIE has a byte_size attribute. */
1221 unsigned int has_byte_size : 1;
1223 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1224 unsigned int has_const_value : 1;
1226 /* Flag set if any of the DIE's children are template arguments. */
1227 unsigned int has_template_arguments : 1;
1229 /* Flag set if fixup_partial_die has been called on this die. */
1230 unsigned int fixup_called : 1;
1232 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1233 unsigned int is_dwz : 1;
1235 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1236 unsigned int spec_is_dwz : 1;
1238 /* The name of this DIE. Normally the value of DW_AT_name, but
1239 sometimes a default name for unnamed DIEs. */
1242 /* The linkage name, if present. */
1243 const char *linkage_name;
1245 /* The scope to prepend to our children. This is generally
1246 allocated on the comp_unit_obstack, so will disappear
1247 when this compilation unit leaves the cache. */
1250 /* Some data associated with the partial DIE. The tag determines
1251 which field is live. */
1254 /* The location description associated with this DIE, if any. */
1255 struct dwarf_block *locdesc;
1256 /* The offset of an import, for DW_TAG_imported_unit. */
1257 sect_offset sect_off;
1260 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1264 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1265 DW_AT_sibling, if any. */
1266 /* NOTE: This member isn't strictly necessary, read_partial_die could
1267 return DW_AT_sibling values to its caller load_partial_dies. */
1268 const gdb_byte *sibling;
1270 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1271 DW_AT_specification (or DW_AT_abstract_origin or
1272 DW_AT_extension). */
1273 sect_offset spec_offset;
1275 /* Pointers to this DIE's parent, first child, and next sibling,
1277 struct partial_die_info *die_parent, *die_child, *die_sibling;
1280 /* This data structure holds the information of an abbrev. */
1283 unsigned int number; /* number identifying abbrev */
1284 enum dwarf_tag tag; /* dwarf tag */
1285 unsigned short has_children; /* boolean */
1286 unsigned short num_attrs; /* number of attributes */
1287 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1288 struct abbrev_info *next; /* next in chain */
1293 ENUM_BITFIELD(dwarf_attribute) name : 16;
1294 ENUM_BITFIELD(dwarf_form) form : 16;
1296 /* It is valid only if FORM is DW_FORM_implicit_const. */
1297 LONGEST implicit_const;
1300 /* Size of abbrev_table.abbrev_hash_table. */
1301 #define ABBREV_HASH_SIZE 121
1303 /* Top level data structure to contain an abbreviation table. */
1307 /* Where the abbrev table came from.
1308 This is used as a sanity check when the table is used. */
1309 sect_offset sect_off;
1311 /* Storage for the abbrev table. */
1312 struct obstack abbrev_obstack;
1314 /* Hash table of abbrevs.
1315 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1316 It could be statically allocated, but the previous code didn't so we
1318 struct abbrev_info **abbrevs;
1321 /* Attributes have a name and a value. */
1324 ENUM_BITFIELD(dwarf_attribute) name : 16;
1325 ENUM_BITFIELD(dwarf_form) form : 15;
1327 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1328 field should be in u.str (existing only for DW_STRING) but it is kept
1329 here for better struct attribute alignment. */
1330 unsigned int string_is_canonical : 1;
1335 struct dwarf_block *blk;
1344 /* This data structure holds a complete die structure. */
1347 /* DWARF-2 tag for this DIE. */
1348 ENUM_BITFIELD(dwarf_tag) tag : 16;
1350 /* Number of attributes */
1351 unsigned char num_attrs;
1353 /* True if we're presently building the full type name for the
1354 type derived from this DIE. */
1355 unsigned char building_fullname : 1;
1357 /* True if this die is in process. PR 16581. */
1358 unsigned char in_process : 1;
1361 unsigned int abbrev;
1363 /* Offset in .debug_info or .debug_types section. */
1364 sect_offset sect_off;
1366 /* The dies in a compilation unit form an n-ary tree. PARENT
1367 points to this die's parent; CHILD points to the first child of
1368 this node; and all the children of a given node are chained
1369 together via their SIBLING fields. */
1370 struct die_info *child; /* Its first child, if any. */
1371 struct die_info *sibling; /* Its next sibling, if any. */
1372 struct die_info *parent; /* Its parent, if any. */
1374 /* An array of attributes, with NUM_ATTRS elements. There may be
1375 zero, but it's not common and zero-sized arrays are not
1376 sufficiently portable C. */
1377 struct attribute attrs[1];
1380 /* Get at parts of an attribute structure. */
1382 #define DW_STRING(attr) ((attr)->u.str)
1383 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1384 #define DW_UNSND(attr) ((attr)->u.unsnd)
1385 #define DW_BLOCK(attr) ((attr)->u.blk)
1386 #define DW_SND(attr) ((attr)->u.snd)
1387 #define DW_ADDR(attr) ((attr)->u.addr)
1388 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1390 /* Blocks are a bunch of untyped bytes. */
1395 /* Valid only if SIZE is not zero. */
1396 const gdb_byte *data;
1399 #ifndef ATTR_ALLOC_CHUNK
1400 #define ATTR_ALLOC_CHUNK 4
1403 /* Allocate fields for structs, unions and enums in this size. */
1404 #ifndef DW_FIELD_ALLOC_CHUNK
1405 #define DW_FIELD_ALLOC_CHUNK 4
1408 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1409 but this would require a corresponding change in unpack_field_as_long
1411 static int bits_per_byte = 8;
1415 struct nextfield *next;
1423 struct nextfnfield *next;
1424 struct fn_field fnfield;
1431 struct nextfnfield *head;
1434 struct typedef_field_list
1436 struct typedef_field field;
1437 struct typedef_field_list *next;
1440 /* The routines that read and process dies for a C struct or C++ class
1441 pass lists of data member fields and lists of member function fields
1442 in an instance of a field_info structure, as defined below. */
1445 /* List of data member and baseclasses fields. */
1446 struct nextfield *fields, *baseclasses;
1448 /* Number of fields (including baseclasses). */
1451 /* Number of baseclasses. */
1454 /* Set if the accesibility of one of the fields is not public. */
1455 int non_public_fields;
1457 /* Member function fields array, entries are allocated in the order they
1458 are encountered in the object file. */
1459 struct nextfnfield *fnfields;
1461 /* Member function fieldlist array, contains name of possibly overloaded
1462 member function, number of overloaded member functions and a pointer
1463 to the head of the member function field chain. */
1464 struct fnfieldlist *fnfieldlists;
1466 /* Number of entries in the fnfieldlists array. */
1469 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1470 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1471 struct typedef_field_list *typedef_field_list;
1472 unsigned typedef_field_list_count;
1475 /* One item on the queue of compilation units to read in full symbols
1477 struct dwarf2_queue_item
1479 struct dwarf2_per_cu_data *per_cu;
1480 enum language pretend_language;
1481 struct dwarf2_queue_item *next;
1484 /* The current queue. */
1485 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1487 /* Loaded secondary compilation units are kept in memory until they
1488 have not been referenced for the processing of this many
1489 compilation units. Set this to zero to disable caching. Cache
1490 sizes of up to at least twenty will improve startup time for
1491 typical inter-CU-reference binaries, at an obvious memory cost. */
1492 static int dwarf_max_cache_age = 5;
1494 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1495 struct cmd_list_element *c, const char *value)
1497 fprintf_filtered (file, _("The upper bound on the age of cached "
1498 "DWARF compilation units is %s.\n"),
1502 /* local function prototypes */
1504 static const char *get_section_name (const struct dwarf2_section_info *);
1506 static const char *get_section_file_name (const struct dwarf2_section_info *);
1508 static void dwarf2_locate_sections (bfd *, asection *, void *);
1510 static void dwarf2_find_base_address (struct die_info *die,
1511 struct dwarf2_cu *cu);
1513 static struct partial_symtab *create_partial_symtab
1514 (struct dwarf2_per_cu_data *per_cu, const char *name);
1516 static void dwarf2_build_psymtabs_hard (struct objfile *);
1518 static void scan_partial_symbols (struct partial_die_info *,
1519 CORE_ADDR *, CORE_ADDR *,
1520 int, struct dwarf2_cu *);
1522 static void add_partial_symbol (struct partial_die_info *,
1523 struct dwarf2_cu *);
1525 static void add_partial_namespace (struct partial_die_info *pdi,
1526 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1527 int set_addrmap, struct dwarf2_cu *cu);
1529 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1530 CORE_ADDR *highpc, int set_addrmap,
1531 struct dwarf2_cu *cu);
1533 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1534 struct dwarf2_cu *cu);
1536 static void add_partial_subprogram (struct partial_die_info *pdi,
1537 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1538 int need_pc, struct dwarf2_cu *cu);
1540 static void dwarf2_read_symtab (struct partial_symtab *,
1543 static void psymtab_to_symtab_1 (struct partial_symtab *);
1545 static struct abbrev_info *abbrev_table_lookup_abbrev
1546 (const struct abbrev_table *, unsigned int);
1548 static struct abbrev_table *abbrev_table_read_table
1549 (struct dwarf2_section_info *, sect_offset);
1551 static void abbrev_table_free (struct abbrev_table *);
1553 static void abbrev_table_free_cleanup (void *);
1555 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1556 struct dwarf2_section_info *);
1558 static void dwarf2_free_abbrev_table (void *);
1560 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1562 static struct partial_die_info *load_partial_dies
1563 (const struct die_reader_specs *, const gdb_byte *, int);
1565 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1566 struct partial_die_info *,
1567 struct abbrev_info *,
1571 static struct partial_die_info *find_partial_die (sect_offset, int,
1572 struct dwarf2_cu *);
1574 static void fixup_partial_die (struct partial_die_info *,
1575 struct dwarf2_cu *);
1577 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1578 struct attribute *, struct attr_abbrev *,
1581 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1583 static int read_1_signed_byte (bfd *, const gdb_byte *);
1585 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1587 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1589 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1591 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1594 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1596 static LONGEST read_checked_initial_length_and_offset
1597 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1598 unsigned int *, unsigned int *);
1600 static LONGEST read_offset (bfd *, const gdb_byte *,
1601 const struct comp_unit_head *,
1604 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1606 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1609 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1611 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1613 static const char *read_indirect_string (bfd *, const gdb_byte *,
1614 const struct comp_unit_head *,
1617 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1618 const struct comp_unit_head *,
1621 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1623 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1625 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1629 static const char *read_str_index (const struct die_reader_specs *reader,
1630 ULONGEST str_index);
1632 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1634 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1635 struct dwarf2_cu *);
1637 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1640 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1641 struct dwarf2_cu *cu);
1643 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1644 struct dwarf2_cu *cu);
1646 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1648 static struct die_info *die_specification (struct die_info *die,
1649 struct dwarf2_cu **);
1651 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1652 struct dwarf2_cu *cu);
1654 static void dwarf_decode_lines (struct line_header *, const char *,
1655 struct dwarf2_cu *, struct partial_symtab *,
1656 CORE_ADDR, int decode_mapping);
1658 static void dwarf2_start_subfile (const char *, const char *);
1660 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1661 const char *, const char *,
1664 static struct symbol *new_symbol (struct die_info *, struct type *,
1665 struct dwarf2_cu *);
1667 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1668 struct dwarf2_cu *, struct symbol *);
1670 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1671 struct dwarf2_cu *);
1673 static void dwarf2_const_value_attr (const struct attribute *attr,
1676 struct obstack *obstack,
1677 struct dwarf2_cu *cu, LONGEST *value,
1678 const gdb_byte **bytes,
1679 struct dwarf2_locexpr_baton **baton);
1681 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1683 static int need_gnat_info (struct dwarf2_cu *);
1685 static struct type *die_descriptive_type (struct die_info *,
1686 struct dwarf2_cu *);
1688 static void set_descriptive_type (struct type *, struct die_info *,
1689 struct dwarf2_cu *);
1691 static struct type *die_containing_type (struct die_info *,
1692 struct dwarf2_cu *);
1694 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1695 struct dwarf2_cu *);
1697 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1699 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1701 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1703 static char *typename_concat (struct obstack *obs, const char *prefix,
1704 const char *suffix, int physname,
1705 struct dwarf2_cu *cu);
1707 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1709 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1711 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1713 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1715 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1717 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1718 struct dwarf2_cu *, struct partial_symtab *);
1720 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1721 values. Keep the items ordered with increasing constraints compliance. */
1724 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1725 PC_BOUNDS_NOT_PRESENT,
1727 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1728 were present but they do not form a valid range of PC addresses. */
1731 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1734 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1738 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1739 CORE_ADDR *, CORE_ADDR *,
1741 struct partial_symtab *);
1743 static void get_scope_pc_bounds (struct die_info *,
1744 CORE_ADDR *, CORE_ADDR *,
1745 struct dwarf2_cu *);
1747 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1748 CORE_ADDR, struct dwarf2_cu *);
1750 static void dwarf2_add_field (struct field_info *, struct die_info *,
1751 struct dwarf2_cu *);
1753 static void dwarf2_attach_fields_to_type (struct field_info *,
1754 struct type *, struct dwarf2_cu *);
1756 static void dwarf2_add_member_fn (struct field_info *,
1757 struct die_info *, struct type *,
1758 struct dwarf2_cu *);
1760 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1762 struct dwarf2_cu *);
1764 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1766 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1768 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1770 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1772 static struct using_direct **using_directives (enum language);
1774 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1776 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1778 static struct type *read_module_type (struct die_info *die,
1779 struct dwarf2_cu *cu);
1781 static const char *namespace_name (struct die_info *die,
1782 int *is_anonymous, struct dwarf2_cu *);
1784 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1786 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1788 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1789 struct dwarf2_cu *);
1791 static struct die_info *read_die_and_siblings_1
1792 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1795 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1796 const gdb_byte *info_ptr,
1797 const gdb_byte **new_info_ptr,
1798 struct die_info *parent);
1800 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1801 struct die_info **, const gdb_byte *,
1804 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1805 struct die_info **, const gdb_byte *,
1808 static void process_die (struct die_info *, struct dwarf2_cu *);
1810 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1813 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1815 static const char *dwarf2_full_name (const char *name,
1816 struct die_info *die,
1817 struct dwarf2_cu *cu);
1819 static const char *dwarf2_physname (const char *name, struct die_info *die,
1820 struct dwarf2_cu *cu);
1822 static struct die_info *dwarf2_extension (struct die_info *die,
1823 struct dwarf2_cu **);
1825 static const char *dwarf_tag_name (unsigned int);
1827 static const char *dwarf_attr_name (unsigned int);
1829 static const char *dwarf_form_name (unsigned int);
1831 static const char *dwarf_bool_name (unsigned int);
1833 static const char *dwarf_type_encoding_name (unsigned int);
1835 static struct die_info *sibling_die (struct die_info *);
1837 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1839 static void dump_die_for_error (struct die_info *);
1841 static void dump_die_1 (struct ui_file *, int level, int max_level,
1844 /*static*/ void dump_die (struct die_info *, int max_level);
1846 static void store_in_ref_table (struct die_info *,
1847 struct dwarf2_cu *);
1849 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1851 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1853 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1854 const struct attribute *,
1855 struct dwarf2_cu **);
1857 static struct die_info *follow_die_ref (struct die_info *,
1858 const struct attribute *,
1859 struct dwarf2_cu **);
1861 static struct die_info *follow_die_sig (struct die_info *,
1862 const struct attribute *,
1863 struct dwarf2_cu **);
1865 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1866 struct dwarf2_cu *);
1868 static struct type *get_DW_AT_signature_type (struct die_info *,
1869 const struct attribute *,
1870 struct dwarf2_cu *);
1872 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1874 static void read_signatured_type (struct signatured_type *);
1876 static int attr_to_dynamic_prop (const struct attribute *attr,
1877 struct die_info *die, struct dwarf2_cu *cu,
1878 struct dynamic_prop *prop);
1880 /* memory allocation interface */
1882 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1884 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1886 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1888 static int attr_form_is_block (const struct attribute *);
1890 static int attr_form_is_section_offset (const struct attribute *);
1892 static int attr_form_is_constant (const struct attribute *);
1894 static int attr_form_is_ref (const struct attribute *);
1896 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1897 struct dwarf2_loclist_baton *baton,
1898 const struct attribute *attr);
1900 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1902 struct dwarf2_cu *cu,
1905 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1906 const gdb_byte *info_ptr,
1907 struct abbrev_info *abbrev);
1909 static void free_stack_comp_unit (void *);
1911 static hashval_t partial_die_hash (const void *item);
1913 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1915 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1916 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
1918 static void init_one_comp_unit (struct dwarf2_cu *cu,
1919 struct dwarf2_per_cu_data *per_cu);
1921 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1922 struct die_info *comp_unit_die,
1923 enum language pretend_language);
1925 static void free_heap_comp_unit (void *);
1927 static void free_cached_comp_units (void *);
1929 static void age_cached_comp_units (void);
1931 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1933 static struct type *set_die_type (struct die_info *, struct type *,
1934 struct dwarf2_cu *);
1936 static void create_all_comp_units (struct objfile *);
1938 static int create_all_type_units (struct objfile *);
1940 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1943 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1946 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1949 static void dwarf2_add_dependence (struct dwarf2_cu *,
1950 struct dwarf2_per_cu_data *);
1952 static void dwarf2_mark (struct dwarf2_cu *);
1954 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1956 static struct type *get_die_type_at_offset (sect_offset,
1957 struct dwarf2_per_cu_data *);
1959 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1961 static void dwarf2_release_queue (void *dummy);
1963 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1964 enum language pretend_language);
1966 static void process_queue (void);
1968 /* The return type of find_file_and_directory. Note, the enclosed
1969 string pointers are only valid while this object is valid. */
1971 struct file_and_directory
1973 /* The filename. This is never NULL. */
1976 /* The compilation directory. NULL if not known. If we needed to
1977 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1978 points directly to the DW_AT_comp_dir string attribute owned by
1979 the obstack that owns the DIE. */
1980 const char *comp_dir;
1982 /* If we needed to build a new string for comp_dir, this is what
1983 owns the storage. */
1984 std::string comp_dir_storage;
1987 static file_and_directory find_file_and_directory (struct die_info *die,
1988 struct dwarf2_cu *cu);
1990 static char *file_full_name (int file, struct line_header *lh,
1991 const char *comp_dir);
1993 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1994 enum class rcuh_kind { COMPILE, TYPE };
1996 static const gdb_byte *read_and_check_comp_unit_head
1997 (struct comp_unit_head *header,
1998 struct dwarf2_section_info *section,
1999 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2000 rcuh_kind section_kind);
2002 static void init_cutu_and_read_dies
2003 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2004 int use_existing_cu, int keep,
2005 die_reader_func_ftype *die_reader_func, void *data);
2007 static void init_cutu_and_read_dies_simple
2008 (struct dwarf2_per_cu_data *this_cu,
2009 die_reader_func_ftype *die_reader_func, void *data);
2011 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2013 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2015 static struct dwo_unit *lookup_dwo_unit_in_dwp
2016 (struct dwp_file *dwp_file, const char *comp_dir,
2017 ULONGEST signature, int is_debug_types);
2019 static struct dwp_file *get_dwp_file (void);
2021 static struct dwo_unit *lookup_dwo_comp_unit
2022 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2024 static struct dwo_unit *lookup_dwo_type_unit
2025 (struct signatured_type *, const char *, const char *);
2027 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2029 static void free_dwo_file_cleanup (void *);
2031 static void process_cu_includes (void);
2033 static void check_producer (struct dwarf2_cu *cu);
2035 static void free_line_header_voidp (void *arg);
2037 /* Various complaints about symbol reading that don't abort the process. */
2040 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2042 complaint (&symfile_complaints,
2043 _("statement list doesn't fit in .debug_line section"));
2047 dwarf2_debug_line_missing_file_complaint (void)
2049 complaint (&symfile_complaints,
2050 _(".debug_line section has line data without a file"));
2054 dwarf2_debug_line_missing_end_sequence_complaint (void)
2056 complaint (&symfile_complaints,
2057 _(".debug_line section has line "
2058 "program sequence without an end"));
2062 dwarf2_complex_location_expr_complaint (void)
2064 complaint (&symfile_complaints, _("location expression too complex"));
2068 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2071 complaint (&symfile_complaints,
2072 _("const value length mismatch for '%s', got %d, expected %d"),
2077 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2079 complaint (&symfile_complaints,
2080 _("debug info runs off end of %s section"
2082 get_section_name (section),
2083 get_section_file_name (section));
2087 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2089 complaint (&symfile_complaints,
2090 _("macro debug info contains a "
2091 "malformed macro definition:\n`%s'"),
2096 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2098 complaint (&symfile_complaints,
2099 _("invalid attribute class or form for '%s' in '%s'"),
2103 /* Hash function for line_header_hash. */
2106 line_header_hash (const struct line_header *ofs)
2108 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2111 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2114 line_header_hash_voidp (const void *item)
2116 const struct line_header *ofs = (const struct line_header *) item;
2118 return line_header_hash (ofs);
2121 /* Equality function for line_header_hash. */
2124 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2126 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2127 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2129 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2130 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2136 /* Convert VALUE between big- and little-endian. */
2138 byte_swap (offset_type value)
2142 result = (value & 0xff) << 24;
2143 result |= (value & 0xff00) << 8;
2144 result |= (value & 0xff0000) >> 8;
2145 result |= (value & 0xff000000) >> 24;
2149 #define MAYBE_SWAP(V) byte_swap (V)
2152 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
2153 #endif /* WORDS_BIGENDIAN */
2155 /* Read the given attribute value as an address, taking the attribute's
2156 form into account. */
2159 attr_value_as_address (struct attribute *attr)
2163 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2165 /* Aside from a few clearly defined exceptions, attributes that
2166 contain an address must always be in DW_FORM_addr form.
2167 Unfortunately, some compilers happen to be violating this
2168 requirement by encoding addresses using other forms, such
2169 as DW_FORM_data4 for example. For those broken compilers,
2170 we try to do our best, without any guarantee of success,
2171 to interpret the address correctly. It would also be nice
2172 to generate a complaint, but that would require us to maintain
2173 a list of legitimate cases where a non-address form is allowed,
2174 as well as update callers to pass in at least the CU's DWARF
2175 version. This is more overhead than what we're willing to
2176 expand for a pretty rare case. */
2177 addr = DW_UNSND (attr);
2180 addr = DW_ADDR (attr);
2185 /* The suffix for an index file. */
2186 #define INDEX_SUFFIX ".gdb-index"
2188 /* Try to locate the sections we need for DWARF 2 debugging
2189 information and return true if we have enough to do something.
2190 NAMES points to the dwarf2 section names, or is NULL if the standard
2191 ELF names are used. */
2194 dwarf2_has_info (struct objfile *objfile,
2195 const struct dwarf2_debug_sections *names)
2197 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2198 objfile_data (objfile, dwarf2_objfile_data_key));
2199 if (!dwarf2_per_objfile)
2201 /* Initialize per-objfile state. */
2202 struct dwarf2_per_objfile *data
2203 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2205 memset (data, 0, sizeof (*data));
2206 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
2207 dwarf2_per_objfile = data;
2209 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
2211 dwarf2_per_objfile->objfile = objfile;
2213 return (!dwarf2_per_objfile->info.is_virtual
2214 && dwarf2_per_objfile->info.s.section != NULL
2215 && !dwarf2_per_objfile->abbrev.is_virtual
2216 && dwarf2_per_objfile->abbrev.s.section != NULL);
2219 /* Return the containing section of virtual section SECTION. */
2221 static struct dwarf2_section_info *
2222 get_containing_section (const struct dwarf2_section_info *section)
2224 gdb_assert (section->is_virtual);
2225 return section->s.containing_section;
2228 /* Return the bfd owner of SECTION. */
2231 get_section_bfd_owner (const struct dwarf2_section_info *section)
2233 if (section->is_virtual)
2235 section = get_containing_section (section);
2236 gdb_assert (!section->is_virtual);
2238 return section->s.section->owner;
2241 /* Return the bfd section of SECTION.
2242 Returns NULL if the section is not present. */
2245 get_section_bfd_section (const struct dwarf2_section_info *section)
2247 if (section->is_virtual)
2249 section = get_containing_section (section);
2250 gdb_assert (!section->is_virtual);
2252 return section->s.section;
2255 /* Return the name of SECTION. */
2258 get_section_name (const struct dwarf2_section_info *section)
2260 asection *sectp = get_section_bfd_section (section);
2262 gdb_assert (sectp != NULL);
2263 return bfd_section_name (get_section_bfd_owner (section), sectp);
2266 /* Return the name of the file SECTION is in. */
2269 get_section_file_name (const struct dwarf2_section_info *section)
2271 bfd *abfd = get_section_bfd_owner (section);
2273 return bfd_get_filename (abfd);
2276 /* Return the id of SECTION.
2277 Returns 0 if SECTION doesn't exist. */
2280 get_section_id (const struct dwarf2_section_info *section)
2282 asection *sectp = get_section_bfd_section (section);
2289 /* Return the flags of SECTION.
2290 SECTION (or containing section if this is a virtual section) must exist. */
2293 get_section_flags (const struct dwarf2_section_info *section)
2295 asection *sectp = get_section_bfd_section (section);
2297 gdb_assert (sectp != NULL);
2298 return bfd_get_section_flags (sectp->owner, sectp);
2301 /* When loading sections, we look either for uncompressed section or for
2302 compressed section names. */
2305 section_is_p (const char *section_name,
2306 const struct dwarf2_section_names *names)
2308 if (names->normal != NULL
2309 && strcmp (section_name, names->normal) == 0)
2311 if (names->compressed != NULL
2312 && strcmp (section_name, names->compressed) == 0)
2317 /* This function is mapped across the sections and remembers the
2318 offset and size of each of the debugging sections we are interested
2322 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
2324 const struct dwarf2_debug_sections *names;
2325 flagword aflag = bfd_get_section_flags (abfd, sectp);
2328 names = &dwarf2_elf_names;
2330 names = (const struct dwarf2_debug_sections *) vnames;
2332 if ((aflag & SEC_HAS_CONTENTS) == 0)
2335 else if (section_is_p (sectp->name, &names->info))
2337 dwarf2_per_objfile->info.s.section = sectp;
2338 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
2340 else if (section_is_p (sectp->name, &names->abbrev))
2342 dwarf2_per_objfile->abbrev.s.section = sectp;
2343 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
2345 else if (section_is_p (sectp->name, &names->line))
2347 dwarf2_per_objfile->line.s.section = sectp;
2348 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
2350 else if (section_is_p (sectp->name, &names->loc))
2352 dwarf2_per_objfile->loc.s.section = sectp;
2353 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
2355 else if (section_is_p (sectp->name, &names->loclists))
2357 dwarf2_per_objfile->loclists.s.section = sectp;
2358 dwarf2_per_objfile->loclists.size = bfd_get_section_size (sectp);
2360 else if (section_is_p (sectp->name, &names->macinfo))
2362 dwarf2_per_objfile->macinfo.s.section = sectp;
2363 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
2365 else if (section_is_p (sectp->name, &names->macro))
2367 dwarf2_per_objfile->macro.s.section = sectp;
2368 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
2370 else if (section_is_p (sectp->name, &names->str))
2372 dwarf2_per_objfile->str.s.section = sectp;
2373 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
2375 else if (section_is_p (sectp->name, &names->line_str))
2377 dwarf2_per_objfile->line_str.s.section = sectp;
2378 dwarf2_per_objfile->line_str.size = bfd_get_section_size (sectp);
2380 else if (section_is_p (sectp->name, &names->addr))
2382 dwarf2_per_objfile->addr.s.section = sectp;
2383 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
2385 else if (section_is_p (sectp->name, &names->frame))
2387 dwarf2_per_objfile->frame.s.section = sectp;
2388 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
2390 else if (section_is_p (sectp->name, &names->eh_frame))
2392 dwarf2_per_objfile->eh_frame.s.section = sectp;
2393 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
2395 else if (section_is_p (sectp->name, &names->ranges))
2397 dwarf2_per_objfile->ranges.s.section = sectp;
2398 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
2400 else if (section_is_p (sectp->name, &names->rnglists))
2402 dwarf2_per_objfile->rnglists.s.section = sectp;
2403 dwarf2_per_objfile->rnglists.size = bfd_get_section_size (sectp);
2405 else if (section_is_p (sectp->name, &names->types))
2407 struct dwarf2_section_info type_section;
2409 memset (&type_section, 0, sizeof (type_section));
2410 type_section.s.section = sectp;
2411 type_section.size = bfd_get_section_size (sectp);
2413 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
2416 else if (section_is_p (sectp->name, &names->gdb_index))
2418 dwarf2_per_objfile->gdb_index.s.section = sectp;
2419 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
2422 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2423 && bfd_section_vma (abfd, sectp) == 0)
2424 dwarf2_per_objfile->has_section_at_zero = 1;
2427 /* A helper function that decides whether a section is empty,
2431 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2433 if (section->is_virtual)
2434 return section->size == 0;
2435 return section->s.section == NULL || section->size == 0;
2438 /* Read the contents of the section INFO.
2439 OBJFILE is the main object file, but not necessarily the file where
2440 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2442 If the section is compressed, uncompress it before returning. */
2445 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2449 gdb_byte *buf, *retbuf;
2453 info->buffer = NULL;
2456 if (dwarf2_section_empty_p (info))
2459 sectp = get_section_bfd_section (info);
2461 /* If this is a virtual section we need to read in the real one first. */
2462 if (info->is_virtual)
2464 struct dwarf2_section_info *containing_section =
2465 get_containing_section (info);
2467 gdb_assert (sectp != NULL);
2468 if ((sectp->flags & SEC_RELOC) != 0)
2470 error (_("Dwarf Error: DWP format V2 with relocations is not"
2471 " supported in section %s [in module %s]"),
2472 get_section_name (info), get_section_file_name (info));
2474 dwarf2_read_section (objfile, containing_section);
2475 /* Other code should have already caught virtual sections that don't
2477 gdb_assert (info->virtual_offset + info->size
2478 <= containing_section->size);
2479 /* If the real section is empty or there was a problem reading the
2480 section we shouldn't get here. */
2481 gdb_assert (containing_section->buffer != NULL);
2482 info->buffer = containing_section->buffer + info->virtual_offset;
2486 /* If the section has relocations, we must read it ourselves.
2487 Otherwise we attach it to the BFD. */
2488 if ((sectp->flags & SEC_RELOC) == 0)
2490 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2494 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2497 /* When debugging .o files, we may need to apply relocations; see
2498 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2499 We never compress sections in .o files, so we only need to
2500 try this when the section is not compressed. */
2501 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2504 info->buffer = retbuf;
2508 abfd = get_section_bfd_owner (info);
2509 gdb_assert (abfd != NULL);
2511 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2512 || bfd_bread (buf, info->size, abfd) != info->size)
2514 error (_("Dwarf Error: Can't read DWARF data"
2515 " in section %s [in module %s]"),
2516 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2520 /* A helper function that returns the size of a section in a safe way.
2521 If you are positive that the section has been read before using the
2522 size, then it is safe to refer to the dwarf2_section_info object's
2523 "size" field directly. In other cases, you must call this
2524 function, because for compressed sections the size field is not set
2525 correctly until the section has been read. */
2527 static bfd_size_type
2528 dwarf2_section_size (struct objfile *objfile,
2529 struct dwarf2_section_info *info)
2532 dwarf2_read_section (objfile, info);
2536 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2540 dwarf2_get_section_info (struct objfile *objfile,
2541 enum dwarf2_section_enum sect,
2542 asection **sectp, const gdb_byte **bufp,
2543 bfd_size_type *sizep)
2545 struct dwarf2_per_objfile *data
2546 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2547 dwarf2_objfile_data_key);
2548 struct dwarf2_section_info *info;
2550 /* We may see an objfile without any DWARF, in which case we just
2561 case DWARF2_DEBUG_FRAME:
2562 info = &data->frame;
2564 case DWARF2_EH_FRAME:
2565 info = &data->eh_frame;
2568 gdb_assert_not_reached ("unexpected section");
2571 dwarf2_read_section (objfile, info);
2573 *sectp = get_section_bfd_section (info);
2574 *bufp = info->buffer;
2575 *sizep = info->size;
2578 /* A helper function to find the sections for a .dwz file. */
2581 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2583 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2585 /* Note that we only support the standard ELF names, because .dwz
2586 is ELF-only (at the time of writing). */
2587 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2589 dwz_file->abbrev.s.section = sectp;
2590 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2592 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2594 dwz_file->info.s.section = sectp;
2595 dwz_file->info.size = bfd_get_section_size (sectp);
2597 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2599 dwz_file->str.s.section = sectp;
2600 dwz_file->str.size = bfd_get_section_size (sectp);
2602 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2604 dwz_file->line.s.section = sectp;
2605 dwz_file->line.size = bfd_get_section_size (sectp);
2607 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2609 dwz_file->macro.s.section = sectp;
2610 dwz_file->macro.size = bfd_get_section_size (sectp);
2612 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2614 dwz_file->gdb_index.s.section = sectp;
2615 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2619 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2620 there is no .gnu_debugaltlink section in the file. Error if there
2621 is such a section but the file cannot be found. */
2623 static struct dwz_file *
2624 dwarf2_get_dwz_file (void)
2627 struct cleanup *cleanup;
2628 const char *filename;
2629 struct dwz_file *result;
2630 bfd_size_type buildid_len_arg;
2634 if (dwarf2_per_objfile->dwz_file != NULL)
2635 return dwarf2_per_objfile->dwz_file;
2637 bfd_set_error (bfd_error_no_error);
2638 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2639 &buildid_len_arg, &buildid);
2642 if (bfd_get_error () == bfd_error_no_error)
2644 error (_("could not read '.gnu_debugaltlink' section: %s"),
2645 bfd_errmsg (bfd_get_error ()));
2647 cleanup = make_cleanup (xfree, data);
2648 make_cleanup (xfree, buildid);
2650 buildid_len = (size_t) buildid_len_arg;
2652 filename = (const char *) data;
2654 std::string abs_storage;
2655 if (!IS_ABSOLUTE_PATH (filename))
2657 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2659 make_cleanup (xfree, abs);
2660 abs_storage = ldirname (abs) + SLASH_STRING + filename;
2661 filename = abs_storage.c_str ();
2664 /* First try the file name given in the section. If that doesn't
2665 work, try to use the build-id instead. */
2666 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2667 if (dwz_bfd != NULL)
2669 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2673 if (dwz_bfd == NULL)
2674 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2676 if (dwz_bfd == NULL)
2677 error (_("could not find '.gnu_debugaltlink' file for %s"),
2678 objfile_name (dwarf2_per_objfile->objfile));
2680 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2682 result->dwz_bfd = dwz_bfd.release ();
2684 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2686 do_cleanups (cleanup);
2688 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2689 dwarf2_per_objfile->dwz_file = result;
2693 /* DWARF quick_symbols_functions support. */
2695 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2696 unique line tables, so we maintain a separate table of all .debug_line
2697 derived entries to support the sharing.
2698 All the quick functions need is the list of file names. We discard the
2699 line_header when we're done and don't need to record it here. */
2700 struct quick_file_names
2702 /* The data used to construct the hash key. */
2703 struct stmt_list_hash hash;
2705 /* The number of entries in file_names, real_names. */
2706 unsigned int num_file_names;
2708 /* The file names from the line table, after being run through
2710 const char **file_names;
2712 /* The file names from the line table after being run through
2713 gdb_realpath. These are computed lazily. */
2714 const char **real_names;
2717 /* When using the index (and thus not using psymtabs), each CU has an
2718 object of this type. This is used to hold information needed by
2719 the various "quick" methods. */
2720 struct dwarf2_per_cu_quick_data
2722 /* The file table. This can be NULL if there was no file table
2723 or it's currently not read in.
2724 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2725 struct quick_file_names *file_names;
2727 /* The corresponding symbol table. This is NULL if symbols for this
2728 CU have not yet been read. */
2729 struct compunit_symtab *compunit_symtab;
2731 /* A temporary mark bit used when iterating over all CUs in
2732 expand_symtabs_matching. */
2733 unsigned int mark : 1;
2735 /* True if we've tried to read the file table and found there isn't one.
2736 There will be no point in trying to read it again next time. */
2737 unsigned int no_file_data : 1;
2740 /* Utility hash function for a stmt_list_hash. */
2743 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2747 if (stmt_list_hash->dwo_unit != NULL)
2748 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2749 v += to_underlying (stmt_list_hash->line_sect_off);
2753 /* Utility equality function for a stmt_list_hash. */
2756 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2757 const struct stmt_list_hash *rhs)
2759 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2761 if (lhs->dwo_unit != NULL
2762 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2765 return lhs->line_sect_off == rhs->line_sect_off;
2768 /* Hash function for a quick_file_names. */
2771 hash_file_name_entry (const void *e)
2773 const struct quick_file_names *file_data
2774 = (const struct quick_file_names *) e;
2776 return hash_stmt_list_entry (&file_data->hash);
2779 /* Equality function for a quick_file_names. */
2782 eq_file_name_entry (const void *a, const void *b)
2784 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2785 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2787 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2790 /* Delete function for a quick_file_names. */
2793 delete_file_name_entry (void *e)
2795 struct quick_file_names *file_data = (struct quick_file_names *) e;
2798 for (i = 0; i < file_data->num_file_names; ++i)
2800 xfree ((void*) file_data->file_names[i]);
2801 if (file_data->real_names)
2802 xfree ((void*) file_data->real_names[i]);
2805 /* The space for the struct itself lives on objfile_obstack,
2806 so we don't free it here. */
2809 /* Create a quick_file_names hash table. */
2812 create_quick_file_names_table (unsigned int nr_initial_entries)
2814 return htab_create_alloc (nr_initial_entries,
2815 hash_file_name_entry, eq_file_name_entry,
2816 delete_file_name_entry, xcalloc, xfree);
2819 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2820 have to be created afterwards. You should call age_cached_comp_units after
2821 processing PER_CU->CU. dw2_setup must have been already called. */
2824 load_cu (struct dwarf2_per_cu_data *per_cu)
2826 if (per_cu->is_debug_types)
2827 load_full_type_unit (per_cu);
2829 load_full_comp_unit (per_cu, language_minimal);
2831 if (per_cu->cu == NULL)
2832 return; /* Dummy CU. */
2834 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2837 /* Read in the symbols for PER_CU. */
2840 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2842 struct cleanup *back_to;
2844 /* Skip type_unit_groups, reading the type units they contain
2845 is handled elsewhere. */
2846 if (IS_TYPE_UNIT_GROUP (per_cu))
2849 back_to = make_cleanup (dwarf2_release_queue, NULL);
2851 if (dwarf2_per_objfile->using_index
2852 ? per_cu->v.quick->compunit_symtab == NULL
2853 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2855 queue_comp_unit (per_cu, language_minimal);
2858 /* If we just loaded a CU from a DWO, and we're working with an index
2859 that may badly handle TUs, load all the TUs in that DWO as well.
2860 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2861 if (!per_cu->is_debug_types
2862 && per_cu->cu != NULL
2863 && per_cu->cu->dwo_unit != NULL
2864 && dwarf2_per_objfile->index_table != NULL
2865 && dwarf2_per_objfile->index_table->version <= 7
2866 /* DWP files aren't supported yet. */
2867 && get_dwp_file () == NULL)
2868 queue_and_load_all_dwo_tus (per_cu);
2873 /* Age the cache, releasing compilation units that have not
2874 been used recently. */
2875 age_cached_comp_units ();
2877 do_cleanups (back_to);
2880 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2881 the objfile from which this CU came. Returns the resulting symbol
2884 static struct compunit_symtab *
2885 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2887 gdb_assert (dwarf2_per_objfile->using_index);
2888 if (!per_cu->v.quick->compunit_symtab)
2890 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2891 scoped_restore decrementer = increment_reading_symtab ();
2892 dw2_do_instantiate_symtab (per_cu);
2893 process_cu_includes ();
2894 do_cleanups (back_to);
2897 return per_cu->v.quick->compunit_symtab;
2900 /* Return the CU/TU given its index.
2902 This is intended for loops like:
2904 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2905 + dwarf2_per_objfile->n_type_units); ++i)
2907 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2913 static struct dwarf2_per_cu_data *
2914 dw2_get_cutu (int index)
2916 if (index >= dwarf2_per_objfile->n_comp_units)
2918 index -= dwarf2_per_objfile->n_comp_units;
2919 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2920 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2923 return dwarf2_per_objfile->all_comp_units[index];
2926 /* Return the CU given its index.
2927 This differs from dw2_get_cutu in that it's for when you know INDEX
2930 static struct dwarf2_per_cu_data *
2931 dw2_get_cu (int index)
2933 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
2935 return dwarf2_per_objfile->all_comp_units[index];
2938 /* A helper for create_cus_from_index that handles a given list of
2942 create_cus_from_index_list (struct objfile *objfile,
2943 const gdb_byte *cu_list, offset_type n_elements,
2944 struct dwarf2_section_info *section,
2950 for (i = 0; i < n_elements; i += 2)
2952 gdb_static_assert (sizeof (ULONGEST) >= 8);
2954 sect_offset sect_off
2955 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2956 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2959 dwarf2_per_cu_data *the_cu
2960 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2961 struct dwarf2_per_cu_data);
2962 the_cu->sect_off = sect_off;
2963 the_cu->length = length;
2964 the_cu->objfile = objfile;
2965 the_cu->section = section;
2966 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2967 struct dwarf2_per_cu_quick_data);
2968 the_cu->is_dwz = is_dwz;
2969 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2973 /* Read the CU list from the mapped index, and use it to create all
2974 the CU objects for this objfile. */
2977 create_cus_from_index (struct objfile *objfile,
2978 const gdb_byte *cu_list, offset_type cu_list_elements,
2979 const gdb_byte *dwz_list, offset_type dwz_elements)
2981 struct dwz_file *dwz;
2983 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2984 dwarf2_per_objfile->all_comp_units =
2985 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
2986 dwarf2_per_objfile->n_comp_units);
2988 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2989 &dwarf2_per_objfile->info, 0, 0);
2991 if (dwz_elements == 0)
2994 dwz = dwarf2_get_dwz_file ();
2995 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2996 cu_list_elements / 2);
2999 /* Create the signatured type hash table from the index. */
3002 create_signatured_type_table_from_index (struct objfile *objfile,
3003 struct dwarf2_section_info *section,
3004 const gdb_byte *bytes,
3005 offset_type elements)
3008 htab_t sig_types_hash;
3010 dwarf2_per_objfile->n_type_units
3011 = dwarf2_per_objfile->n_allocated_type_units
3013 dwarf2_per_objfile->all_type_units =
3014 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3016 sig_types_hash = allocate_signatured_type_table (objfile);
3018 for (i = 0; i < elements; i += 3)
3020 struct signatured_type *sig_type;
3023 cu_offset type_offset_in_tu;
3025 gdb_static_assert (sizeof (ULONGEST) >= 8);
3026 sect_offset sect_off
3027 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3029 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3031 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3034 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3035 struct signatured_type);
3036 sig_type->signature = signature;
3037 sig_type->type_offset_in_tu = type_offset_in_tu;
3038 sig_type->per_cu.is_debug_types = 1;
3039 sig_type->per_cu.section = section;
3040 sig_type->per_cu.sect_off = sect_off;
3041 sig_type->per_cu.objfile = objfile;
3042 sig_type->per_cu.v.quick
3043 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3044 struct dwarf2_per_cu_quick_data);
3046 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3049 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3052 dwarf2_per_objfile->signatured_types = sig_types_hash;
3055 /* Read the address map data from the mapped index, and use it to
3056 populate the objfile's psymtabs_addrmap. */
3059 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3061 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3062 const gdb_byte *iter, *end;
3063 struct obstack temp_obstack;
3064 struct addrmap *mutable_map;
3065 struct cleanup *cleanup;
3068 obstack_init (&temp_obstack);
3069 cleanup = make_cleanup_obstack_free (&temp_obstack);
3070 mutable_map = addrmap_create_mutable (&temp_obstack);
3072 iter = index->address_table;
3073 end = iter + index->address_table_size;
3075 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3079 ULONGEST hi, lo, cu_index;
3080 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3082 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3084 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3089 complaint (&symfile_complaints,
3090 _(".gdb_index address table has invalid range (%s - %s)"),
3091 hex_string (lo), hex_string (hi));
3095 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3097 complaint (&symfile_complaints,
3098 _(".gdb_index address table has invalid CU number %u"),
3099 (unsigned) cu_index);
3103 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3104 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3105 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3108 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3109 &objfile->objfile_obstack);
3110 do_cleanups (cleanup);
3113 /* The hash function for strings in the mapped index. This is the same as
3114 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3115 implementation. This is necessary because the hash function is tied to the
3116 format of the mapped index file. The hash values do not have to match with
3119 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3122 mapped_index_string_hash (int index_version, const void *p)
3124 const unsigned char *str = (const unsigned char *) p;
3128 while ((c = *str++) != 0)
3130 if (index_version >= 5)
3132 r = r * 67 + c - 113;
3138 /* Find a slot in the mapped index INDEX for the object named NAME.
3139 If NAME is found, set *VEC_OUT to point to the CU vector in the
3140 constant pool and return 1. If NAME cannot be found, return 0. */
3143 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3144 offset_type **vec_out)
3146 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
3148 offset_type slot, step;
3149 int (*cmp) (const char *, const char *);
3151 if (current_language->la_language == language_cplus
3152 || current_language->la_language == language_fortran
3153 || current_language->la_language == language_d)
3155 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3158 if (strchr (name, '(') != NULL)
3160 char *without_params = cp_remove_params (name);
3162 if (without_params != NULL)
3164 make_cleanup (xfree, without_params);
3165 name = without_params;
3170 /* Index version 4 did not support case insensitive searches. But the
3171 indices for case insensitive languages are built in lowercase, therefore
3172 simulate our NAME being searched is also lowercased. */
3173 hash = mapped_index_string_hash ((index->version == 4
3174 && case_sensitivity == case_sensitive_off
3175 ? 5 : index->version),
3178 slot = hash & (index->symbol_table_slots - 1);
3179 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3180 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3184 /* Convert a slot number to an offset into the table. */
3185 offset_type i = 2 * slot;
3187 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3189 do_cleanups (back_to);
3193 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3194 if (!cmp (name, str))
3196 *vec_out = (offset_type *) (index->constant_pool
3197 + MAYBE_SWAP (index->symbol_table[i + 1]));
3198 do_cleanups (back_to);
3202 slot = (slot + step) & (index->symbol_table_slots - 1);
3206 /* A helper function that reads the .gdb_index from SECTION and fills
3207 in MAP. FILENAME is the name of the file containing the section;
3208 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3209 ok to use deprecated sections.
3211 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3212 out parameters that are filled in with information about the CU and
3213 TU lists in the section.
3215 Returns 1 if all went well, 0 otherwise. */
3218 read_index_from_section (struct objfile *objfile,
3219 const char *filename,
3221 struct dwarf2_section_info *section,
3222 struct mapped_index *map,
3223 const gdb_byte **cu_list,
3224 offset_type *cu_list_elements,
3225 const gdb_byte **types_list,
3226 offset_type *types_list_elements)
3228 const gdb_byte *addr;
3229 offset_type version;
3230 offset_type *metadata;
3233 if (dwarf2_section_empty_p (section))
3236 /* Older elfutils strip versions could keep the section in the main
3237 executable while splitting it for the separate debug info file. */
3238 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3241 dwarf2_read_section (objfile, section);
3243 addr = section->buffer;
3244 /* Version check. */
3245 version = MAYBE_SWAP (*(offset_type *) addr);
3246 /* Versions earlier than 3 emitted every copy of a psymbol. This
3247 causes the index to behave very poorly for certain requests. Version 3
3248 contained incomplete addrmap. So, it seems better to just ignore such
3252 static int warning_printed = 0;
3253 if (!warning_printed)
3255 warning (_("Skipping obsolete .gdb_index section in %s."),
3257 warning_printed = 1;
3261 /* Index version 4 uses a different hash function than index version
3264 Versions earlier than 6 did not emit psymbols for inlined
3265 functions. Using these files will cause GDB not to be able to
3266 set breakpoints on inlined functions by name, so we ignore these
3267 indices unless the user has done
3268 "set use-deprecated-index-sections on". */
3269 if (version < 6 && !deprecated_ok)
3271 static int warning_printed = 0;
3272 if (!warning_printed)
3275 Skipping deprecated .gdb_index section in %s.\n\
3276 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3277 to use the section anyway."),
3279 warning_printed = 1;
3283 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3284 of the TU (for symbols coming from TUs),
3285 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3286 Plus gold-generated indices can have duplicate entries for global symbols,
3287 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3288 These are just performance bugs, and we can't distinguish gdb-generated
3289 indices from gold-generated ones, so issue no warning here. */
3291 /* Indexes with higher version than the one supported by GDB may be no
3292 longer backward compatible. */
3296 map->version = version;
3297 map->total_size = section->size;
3299 metadata = (offset_type *) (addr + sizeof (offset_type));
3302 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3303 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3307 *types_list = addr + MAYBE_SWAP (metadata[i]);
3308 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3309 - MAYBE_SWAP (metadata[i]))
3313 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3314 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3315 - MAYBE_SWAP (metadata[i]));
3318 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3319 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3320 - MAYBE_SWAP (metadata[i]))
3321 / (2 * sizeof (offset_type)));
3324 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3330 /* Read the index file. If everything went ok, initialize the "quick"
3331 elements of all the CUs and return 1. Otherwise, return 0. */
3334 dwarf2_read_index (struct objfile *objfile)
3336 struct mapped_index local_map, *map;
3337 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3338 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3339 struct dwz_file *dwz;
3341 if (!read_index_from_section (objfile, objfile_name (objfile),
3342 use_deprecated_index_sections,
3343 &dwarf2_per_objfile->gdb_index, &local_map,
3344 &cu_list, &cu_list_elements,
3345 &types_list, &types_list_elements))
3348 /* Don't use the index if it's empty. */
3349 if (local_map.symbol_table_slots == 0)
3352 /* If there is a .dwz file, read it so we can get its CU list as
3354 dwz = dwarf2_get_dwz_file ();
3357 struct mapped_index dwz_map;
3358 const gdb_byte *dwz_types_ignore;
3359 offset_type dwz_types_elements_ignore;
3361 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3363 &dwz->gdb_index, &dwz_map,
3364 &dwz_list, &dwz_list_elements,
3366 &dwz_types_elements_ignore))
3368 warning (_("could not read '.gdb_index' section from %s; skipping"),
3369 bfd_get_filename (dwz->dwz_bfd));
3374 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3377 if (types_list_elements)
3379 struct dwarf2_section_info *section;
3381 /* We can only handle a single .debug_types when we have an
3383 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3386 section = VEC_index (dwarf2_section_info_def,
3387 dwarf2_per_objfile->types, 0);
3389 create_signatured_type_table_from_index (objfile, section, types_list,
3390 types_list_elements);
3393 create_addrmap_from_index (objfile, &local_map);
3395 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3398 dwarf2_per_objfile->index_table = map;
3399 dwarf2_per_objfile->using_index = 1;
3400 dwarf2_per_objfile->quick_file_names_table =
3401 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3406 /* A helper for the "quick" functions which sets the global
3407 dwarf2_per_objfile according to OBJFILE. */
3410 dw2_setup (struct objfile *objfile)
3412 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3413 objfile_data (objfile, dwarf2_objfile_data_key));
3414 gdb_assert (dwarf2_per_objfile);
3417 /* die_reader_func for dw2_get_file_names. */
3420 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3421 const gdb_byte *info_ptr,
3422 struct die_info *comp_unit_die,
3426 struct dwarf2_cu *cu = reader->cu;
3427 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3428 struct objfile *objfile = dwarf2_per_objfile->objfile;
3429 struct dwarf2_per_cu_data *lh_cu;
3430 struct attribute *attr;
3433 struct quick_file_names *qfn;
3435 gdb_assert (! this_cu->is_debug_types);
3437 /* Our callers never want to match partial units -- instead they
3438 will match the enclosing full CU. */
3439 if (comp_unit_die->tag == DW_TAG_partial_unit)
3441 this_cu->v.quick->no_file_data = 1;
3449 sect_offset line_offset {};
3451 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3454 struct quick_file_names find_entry;
3456 line_offset = (sect_offset) DW_UNSND (attr);
3458 /* We may have already read in this line header (TU line header sharing).
3459 If we have we're done. */
3460 find_entry.hash.dwo_unit = cu->dwo_unit;
3461 find_entry.hash.line_sect_off = line_offset;
3462 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3463 &find_entry, INSERT);
3466 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3470 lh = dwarf_decode_line_header (line_offset, cu);
3474 lh_cu->v.quick->no_file_data = 1;
3478 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3479 qfn->hash.dwo_unit = cu->dwo_unit;
3480 qfn->hash.line_sect_off = line_offset;
3481 gdb_assert (slot != NULL);
3484 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3486 qfn->num_file_names = lh->file_names.size ();
3488 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3489 for (i = 0; i < lh->file_names.size (); ++i)
3490 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3491 qfn->real_names = NULL;
3493 lh_cu->v.quick->file_names = qfn;
3496 /* A helper for the "quick" functions which attempts to read the line
3497 table for THIS_CU. */
3499 static struct quick_file_names *
3500 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3502 /* This should never be called for TUs. */
3503 gdb_assert (! this_cu->is_debug_types);
3504 /* Nor type unit groups. */
3505 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3507 if (this_cu->v.quick->file_names != NULL)
3508 return this_cu->v.quick->file_names;
3509 /* If we know there is no line data, no point in looking again. */
3510 if (this_cu->v.quick->no_file_data)
3513 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3515 if (this_cu->v.quick->no_file_data)
3517 return this_cu->v.quick->file_names;
3520 /* A helper for the "quick" functions which computes and caches the
3521 real path for a given file name from the line table. */
3524 dw2_get_real_path (struct objfile *objfile,
3525 struct quick_file_names *qfn, int index)
3527 if (qfn->real_names == NULL)
3528 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3529 qfn->num_file_names, const char *);
3531 if (qfn->real_names[index] == NULL)
3532 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3534 return qfn->real_names[index];
3537 static struct symtab *
3538 dw2_find_last_source_symtab (struct objfile *objfile)
3540 struct compunit_symtab *cust;
3543 dw2_setup (objfile);
3544 index = dwarf2_per_objfile->n_comp_units - 1;
3545 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3548 return compunit_primary_filetab (cust);
3551 /* Traversal function for dw2_forget_cached_source_info. */
3554 dw2_free_cached_file_names (void **slot, void *info)
3556 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3558 if (file_data->real_names)
3562 for (i = 0; i < file_data->num_file_names; ++i)
3564 xfree ((void*) file_data->real_names[i]);
3565 file_data->real_names[i] = NULL;
3573 dw2_forget_cached_source_info (struct objfile *objfile)
3575 dw2_setup (objfile);
3577 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3578 dw2_free_cached_file_names, NULL);
3581 /* Helper function for dw2_map_symtabs_matching_filename that expands
3582 the symtabs and calls the iterator. */
3585 dw2_map_expand_apply (struct objfile *objfile,
3586 struct dwarf2_per_cu_data *per_cu,
3587 const char *name, const char *real_path,
3588 gdb::function_view<bool (symtab *)> callback)
3590 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3592 /* Don't visit already-expanded CUs. */
3593 if (per_cu->v.quick->compunit_symtab)
3596 /* This may expand more than one symtab, and we want to iterate over
3598 dw2_instantiate_symtab (per_cu);
3600 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3601 last_made, callback);
3604 /* Implementation of the map_symtabs_matching_filename method. */
3607 dw2_map_symtabs_matching_filename
3608 (struct objfile *objfile, const char *name, const char *real_path,
3609 gdb::function_view<bool (symtab *)> callback)
3612 const char *name_basename = lbasename (name);
3614 dw2_setup (objfile);
3616 /* The rule is CUs specify all the files, including those used by
3617 any TU, so there's no need to scan TUs here. */
3619 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3622 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3623 struct quick_file_names *file_data;
3625 /* We only need to look at symtabs not already expanded. */
3626 if (per_cu->v.quick->compunit_symtab)
3629 file_data = dw2_get_file_names (per_cu);
3630 if (file_data == NULL)
3633 for (j = 0; j < file_data->num_file_names; ++j)
3635 const char *this_name = file_data->file_names[j];
3636 const char *this_real_name;
3638 if (compare_filenames_for_search (this_name, name))
3640 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3646 /* Before we invoke realpath, which can get expensive when many
3647 files are involved, do a quick comparison of the basenames. */
3648 if (! basenames_may_differ
3649 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3652 this_real_name = dw2_get_real_path (objfile, file_data, j);
3653 if (compare_filenames_for_search (this_real_name, name))
3655 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3661 if (real_path != NULL)
3663 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3664 gdb_assert (IS_ABSOLUTE_PATH (name));
3665 if (this_real_name != NULL
3666 && FILENAME_CMP (real_path, this_real_name) == 0)
3668 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3680 /* Struct used to manage iterating over all CUs looking for a symbol. */
3682 struct dw2_symtab_iterator
3684 /* The internalized form of .gdb_index. */
3685 struct mapped_index *index;
3686 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3687 int want_specific_block;
3688 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3689 Unused if !WANT_SPECIFIC_BLOCK. */
3691 /* The kind of symbol we're looking for. */
3693 /* The list of CUs from the index entry of the symbol,
3694 or NULL if not found. */
3696 /* The next element in VEC to look at. */
3698 /* The number of elements in VEC, or zero if there is no match. */
3700 /* Have we seen a global version of the symbol?
3701 If so we can ignore all further global instances.
3702 This is to work around gold/15646, inefficient gold-generated
3707 /* Initialize the index symtab iterator ITER.
3708 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3709 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3712 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3713 struct mapped_index *index,
3714 int want_specific_block,
3719 iter->index = index;
3720 iter->want_specific_block = want_specific_block;
3721 iter->block_index = block_index;
3722 iter->domain = domain;
3724 iter->global_seen = 0;
3726 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3727 iter->length = MAYBE_SWAP (*iter->vec);
3735 /* Return the next matching CU or NULL if there are no more. */
3737 static struct dwarf2_per_cu_data *
3738 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3740 for ( ; iter->next < iter->length; ++iter->next)
3742 offset_type cu_index_and_attrs =
3743 MAYBE_SWAP (iter->vec[iter->next + 1]);
3744 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3745 struct dwarf2_per_cu_data *per_cu;
3746 int want_static = iter->block_index != GLOBAL_BLOCK;
3747 /* This value is only valid for index versions >= 7. */
3748 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3749 gdb_index_symbol_kind symbol_kind =
3750 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3751 /* Only check the symbol attributes if they're present.
3752 Indices prior to version 7 don't record them,
3753 and indices >= 7 may elide them for certain symbols
3754 (gold does this). */
3756 (iter->index->version >= 7
3757 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3759 /* Don't crash on bad data. */
3760 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3761 + dwarf2_per_objfile->n_type_units))
3763 complaint (&symfile_complaints,
3764 _(".gdb_index entry has bad CU index"
3766 objfile_name (dwarf2_per_objfile->objfile));
3770 per_cu = dw2_get_cutu (cu_index);
3772 /* Skip if already read in. */
3773 if (per_cu->v.quick->compunit_symtab)
3776 /* Check static vs global. */
3779 if (iter->want_specific_block
3780 && want_static != is_static)
3782 /* Work around gold/15646. */
3783 if (!is_static && iter->global_seen)
3786 iter->global_seen = 1;
3789 /* Only check the symbol's kind if it has one. */
3792 switch (iter->domain)
3795 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3796 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3797 /* Some types are also in VAR_DOMAIN. */
3798 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3802 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3806 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3821 static struct compunit_symtab *
3822 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3823 const char *name, domain_enum domain)
3825 struct compunit_symtab *stab_best = NULL;
3826 struct mapped_index *index;
3828 dw2_setup (objfile);
3830 index = dwarf2_per_objfile->index_table;
3832 /* index is NULL if OBJF_READNOW. */
3835 struct dw2_symtab_iterator iter;
3836 struct dwarf2_per_cu_data *per_cu;
3838 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3840 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3842 struct symbol *sym, *with_opaque = NULL;
3843 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3844 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3845 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3847 sym = block_find_symbol (block, name, domain,
3848 block_find_non_opaque_type_preferred,
3851 /* Some caution must be observed with overloaded functions
3852 and methods, since the index will not contain any overload
3853 information (but NAME might contain it). */
3856 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3858 if (with_opaque != NULL
3859 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
3862 /* Keep looking through other CUs. */
3870 dw2_print_stats (struct objfile *objfile)
3872 int i, total, count;
3874 dw2_setup (objfile);
3875 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3877 for (i = 0; i < total; ++i)
3879 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3881 if (!per_cu->v.quick->compunit_symtab)
3884 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3885 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3888 /* This dumps minimal information about the index.
3889 It is called via "mt print objfiles".
3890 One use is to verify .gdb_index has been loaded by the
3891 gdb.dwarf2/gdb-index.exp testcase. */
3894 dw2_dump (struct objfile *objfile)
3896 dw2_setup (objfile);
3897 gdb_assert (dwarf2_per_objfile->using_index);
3898 printf_filtered (".gdb_index:");
3899 if (dwarf2_per_objfile->index_table != NULL)
3901 printf_filtered (" version %d\n",
3902 dwarf2_per_objfile->index_table->version);
3905 printf_filtered (" faked for \"readnow\"\n");
3906 printf_filtered ("\n");
3910 dw2_relocate (struct objfile *objfile,
3911 const struct section_offsets *new_offsets,
3912 const struct section_offsets *delta)
3914 /* There's nothing to relocate here. */
3918 dw2_expand_symtabs_for_function (struct objfile *objfile,
3919 const char *func_name)
3921 struct mapped_index *index;
3923 dw2_setup (objfile);
3925 index = dwarf2_per_objfile->index_table;
3927 /* index is NULL if OBJF_READNOW. */
3930 struct dw2_symtab_iterator iter;
3931 struct dwarf2_per_cu_data *per_cu;
3933 /* Note: It doesn't matter what we pass for block_index here. */
3934 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3937 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3938 dw2_instantiate_symtab (per_cu);
3943 dw2_expand_all_symtabs (struct objfile *objfile)
3947 dw2_setup (objfile);
3949 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3950 + dwarf2_per_objfile->n_type_units); ++i)
3952 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3954 dw2_instantiate_symtab (per_cu);
3959 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3960 const char *fullname)
3964 dw2_setup (objfile);
3966 /* We don't need to consider type units here.
3967 This is only called for examining code, e.g. expand_line_sal.
3968 There can be an order of magnitude (or more) more type units
3969 than comp units, and we avoid them if we can. */
3971 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3974 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3975 struct quick_file_names *file_data;
3977 /* We only need to look at symtabs not already expanded. */
3978 if (per_cu->v.quick->compunit_symtab)
3981 file_data = dw2_get_file_names (per_cu);
3982 if (file_data == NULL)
3985 for (j = 0; j < file_data->num_file_names; ++j)
3987 const char *this_fullname = file_data->file_names[j];
3989 if (filename_cmp (this_fullname, fullname) == 0)
3991 dw2_instantiate_symtab (per_cu);
3999 dw2_map_matching_symbols (struct objfile *objfile,
4000 const char * name, domain_enum domain,
4002 int (*callback) (struct block *,
4003 struct symbol *, void *),
4004 void *data, symbol_compare_ftype *match,
4005 symbol_compare_ftype *ordered_compare)
4007 /* Currently unimplemented; used for Ada. The function can be called if the
4008 current language is Ada for a non-Ada objfile using GNU index. As Ada
4009 does not look for non-Ada symbols this function should just return. */
4013 dw2_expand_symtabs_matching
4014 (struct objfile *objfile,
4015 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4016 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4017 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4018 enum search_domain kind)
4022 struct mapped_index *index;
4024 dw2_setup (objfile);
4026 /* index_table is NULL if OBJF_READNOW. */
4027 if (!dwarf2_per_objfile->index_table)
4029 index = dwarf2_per_objfile->index_table;
4031 if (file_matcher != NULL)
4033 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
4035 NULL, xcalloc, xfree));
4036 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
4038 NULL, xcalloc, xfree));
4040 /* The rule is CUs specify all the files, including those used by
4041 any TU, so there's no need to scan TUs here. */
4043 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4046 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4047 struct quick_file_names *file_data;
4052 per_cu->v.quick->mark = 0;
4054 /* We only need to look at symtabs not already expanded. */
4055 if (per_cu->v.quick->compunit_symtab)
4058 file_data = dw2_get_file_names (per_cu);
4059 if (file_data == NULL)
4062 if (htab_find (visited_not_found.get (), file_data) != NULL)
4064 else if (htab_find (visited_found.get (), file_data) != NULL)
4066 per_cu->v.quick->mark = 1;
4070 for (j = 0; j < file_data->num_file_names; ++j)
4072 const char *this_real_name;
4074 if (file_matcher (file_data->file_names[j], false))
4076 per_cu->v.quick->mark = 1;
4080 /* Before we invoke realpath, which can get expensive when many
4081 files are involved, do a quick comparison of the basenames. */
4082 if (!basenames_may_differ
4083 && !file_matcher (lbasename (file_data->file_names[j]),
4087 this_real_name = dw2_get_real_path (objfile, file_data, j);
4088 if (file_matcher (this_real_name, false))
4090 per_cu->v.quick->mark = 1;
4095 slot = htab_find_slot (per_cu->v.quick->mark
4096 ? visited_found.get ()
4097 : visited_not_found.get (),
4103 for (iter = 0; iter < index->symbol_table_slots; ++iter)
4105 offset_type idx = 2 * iter;
4107 offset_type *vec, vec_len, vec_idx;
4108 int global_seen = 0;
4112 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
4115 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
4117 if (!symbol_matcher (name))
4120 /* The name was matched, now expand corresponding CUs that were
4122 vec = (offset_type *) (index->constant_pool
4123 + MAYBE_SWAP (index->symbol_table[idx + 1]));
4124 vec_len = MAYBE_SWAP (vec[0]);
4125 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4127 struct dwarf2_per_cu_data *per_cu;
4128 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4129 /* This value is only valid for index versions >= 7. */
4130 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4131 gdb_index_symbol_kind symbol_kind =
4132 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4133 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4134 /* Only check the symbol attributes if they're present.
4135 Indices prior to version 7 don't record them,
4136 and indices >= 7 may elide them for certain symbols
4137 (gold does this). */
4139 (index->version >= 7
4140 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4142 /* Work around gold/15646. */
4145 if (!is_static && global_seen)
4151 /* Only check the symbol's kind if it has one. */
4156 case VARIABLES_DOMAIN:
4157 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4160 case FUNCTIONS_DOMAIN:
4161 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4165 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4173 /* Don't crash on bad data. */
4174 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4175 + dwarf2_per_objfile->n_type_units))
4177 complaint (&symfile_complaints,
4178 _(".gdb_index entry has bad CU index"
4179 " [in module %s]"), objfile_name (objfile));
4183 per_cu = dw2_get_cutu (cu_index);
4184 if (file_matcher == NULL || per_cu->v.quick->mark)
4186 int symtab_was_null =
4187 (per_cu->v.quick->compunit_symtab == NULL);
4189 dw2_instantiate_symtab (per_cu);
4191 if (expansion_notify != NULL
4193 && per_cu->v.quick->compunit_symtab != NULL)
4195 expansion_notify (per_cu->v.quick->compunit_symtab);
4202 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4205 static struct compunit_symtab *
4206 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4211 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4212 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4215 if (cust->includes == NULL)
4218 for (i = 0; cust->includes[i]; ++i)
4220 struct compunit_symtab *s = cust->includes[i];
4222 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4230 static struct compunit_symtab *
4231 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4232 struct bound_minimal_symbol msymbol,
4234 struct obj_section *section,
4237 struct dwarf2_per_cu_data *data;
4238 struct compunit_symtab *result;
4240 dw2_setup (objfile);
4242 if (!objfile->psymtabs_addrmap)
4245 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4250 if (warn_if_readin && data->v.quick->compunit_symtab)
4251 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4252 paddress (get_objfile_arch (objfile), pc));
4255 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4257 gdb_assert (result != NULL);
4262 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4263 void *data, int need_fullname)
4266 htab_up visited (htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
4267 NULL, xcalloc, xfree));
4269 dw2_setup (objfile);
4271 /* The rule is CUs specify all the files, including those used by
4272 any TU, so there's no need to scan TUs here.
4273 We can ignore file names coming from already-expanded CUs. */
4275 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4277 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4279 if (per_cu->v.quick->compunit_symtab)
4281 void **slot = htab_find_slot (visited.get (),
4282 per_cu->v.quick->file_names,
4285 *slot = per_cu->v.quick->file_names;
4289 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4292 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4293 struct quick_file_names *file_data;
4296 /* We only need to look at symtabs not already expanded. */
4297 if (per_cu->v.quick->compunit_symtab)
4300 file_data = dw2_get_file_names (per_cu);
4301 if (file_data == NULL)
4304 slot = htab_find_slot (visited.get (), file_data, INSERT);
4307 /* Already visited. */
4312 for (j = 0; j < file_data->num_file_names; ++j)
4314 const char *this_real_name;
4317 this_real_name = dw2_get_real_path (objfile, file_data, j);
4319 this_real_name = NULL;
4320 (*fun) (file_data->file_names[j], this_real_name, data);
4326 dw2_has_symbols (struct objfile *objfile)
4331 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4334 dw2_find_last_source_symtab,
4335 dw2_forget_cached_source_info,
4336 dw2_map_symtabs_matching_filename,
4341 dw2_expand_symtabs_for_function,
4342 dw2_expand_all_symtabs,
4343 dw2_expand_symtabs_with_fullname,
4344 dw2_map_matching_symbols,
4345 dw2_expand_symtabs_matching,
4346 dw2_find_pc_sect_compunit_symtab,
4347 dw2_map_symbol_filenames
4350 /* Initialize for reading DWARF for this objfile. Return 0 if this
4351 file will use psymtabs, or 1 if using the GNU index. */
4354 dwarf2_initialize_objfile (struct objfile *objfile)
4356 /* If we're about to read full symbols, don't bother with the
4357 indices. In this case we also don't care if some other debug
4358 format is making psymtabs, because they are all about to be
4360 if ((objfile->flags & OBJF_READNOW))
4364 dwarf2_per_objfile->using_index = 1;
4365 create_all_comp_units (objfile);
4366 create_all_type_units (objfile);
4367 dwarf2_per_objfile->quick_file_names_table =
4368 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4370 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4371 + dwarf2_per_objfile->n_type_units); ++i)
4373 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4375 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4376 struct dwarf2_per_cu_quick_data);
4379 /* Return 1 so that gdb sees the "quick" functions. However,
4380 these functions will be no-ops because we will have expanded
4385 if (dwarf2_read_index (objfile))
4393 /* Build a partial symbol table. */
4396 dwarf2_build_psymtabs (struct objfile *objfile)
4399 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4401 init_psymbol_list (objfile, 1024);
4406 /* This isn't really ideal: all the data we allocate on the
4407 objfile's obstack is still uselessly kept around. However,
4408 freeing it seems unsafe. */
4409 psymtab_discarder psymtabs (objfile);
4410 dwarf2_build_psymtabs_hard (objfile);
4413 CATCH (except, RETURN_MASK_ERROR)
4415 exception_print (gdb_stderr, except);
4420 /* Return the total length of the CU described by HEADER. */
4423 get_cu_length (const struct comp_unit_head *header)
4425 return header->initial_length_size + header->length;
4428 /* Return TRUE if SECT_OFF is within CU_HEADER. */
4431 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
4433 sect_offset bottom = cu_header->sect_off;
4434 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
4436 return sect_off >= bottom && sect_off < top;
4439 /* Find the base address of the compilation unit for range lists and
4440 location lists. It will normally be specified by DW_AT_low_pc.
4441 In DWARF-3 draft 4, the base address could be overridden by
4442 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4443 compilation units with discontinuous ranges. */
4446 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4448 struct attribute *attr;
4451 cu->base_address = 0;
4453 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4456 cu->base_address = attr_value_as_address (attr);
4461 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4464 cu->base_address = attr_value_as_address (attr);
4470 /* Read in the comp unit header information from the debug_info at info_ptr.
4471 Use rcuh_kind::COMPILE as the default type if not known by the caller.
4472 NOTE: This leaves members offset, first_die_offset to be filled in
4475 static const gdb_byte *
4476 read_comp_unit_head (struct comp_unit_head *cu_header,
4477 const gdb_byte *info_ptr,
4478 struct dwarf2_section_info *section,
4479 rcuh_kind section_kind)
4482 unsigned int bytes_read;
4483 const char *filename = get_section_file_name (section);
4484 bfd *abfd = get_section_bfd_owner (section);
4486 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4487 cu_header->initial_length_size = bytes_read;
4488 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4489 info_ptr += bytes_read;
4490 cu_header->version = read_2_bytes (abfd, info_ptr);
4492 if (cu_header->version < 5)
4493 switch (section_kind)
4495 case rcuh_kind::COMPILE:
4496 cu_header->unit_type = DW_UT_compile;
4498 case rcuh_kind::TYPE:
4499 cu_header->unit_type = DW_UT_type;
4502 internal_error (__FILE__, __LINE__,
4503 _("read_comp_unit_head: invalid section_kind"));
4507 cu_header->unit_type = static_cast<enum dwarf_unit_type>
4508 (read_1_byte (abfd, info_ptr));
4510 switch (cu_header->unit_type)
4513 if (section_kind != rcuh_kind::COMPILE)
4514 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4515 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
4519 section_kind = rcuh_kind::TYPE;
4522 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4523 "(is %d, should be %d or %d) [in module %s]"),
4524 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
4527 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4530 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
4533 info_ptr += bytes_read;
4534 if (cu_header->version < 5)
4536 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4539 signed_addr = bfd_get_sign_extend_vma (abfd);
4540 if (signed_addr < 0)
4541 internal_error (__FILE__, __LINE__,
4542 _("read_comp_unit_head: dwarf from non elf file"));
4543 cu_header->signed_addr_p = signed_addr;
4545 if (section_kind == rcuh_kind::TYPE)
4547 LONGEST type_offset;
4549 cu_header->signature = read_8_bytes (abfd, info_ptr);
4552 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
4553 info_ptr += bytes_read;
4554 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
4555 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
4556 error (_("Dwarf Error: Too big type_offset in compilation unit "
4557 "header (is %s) [in module %s]"), plongest (type_offset),
4564 /* Helper function that returns the proper abbrev section for
4567 static struct dwarf2_section_info *
4568 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4570 struct dwarf2_section_info *abbrev;
4572 if (this_cu->is_dwz)
4573 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4575 abbrev = &dwarf2_per_objfile->abbrev;
4580 /* Subroutine of read_and_check_comp_unit_head and
4581 read_and_check_type_unit_head to simplify them.
4582 Perform various error checking on the header. */
4585 error_check_comp_unit_head (struct comp_unit_head *header,
4586 struct dwarf2_section_info *section,
4587 struct dwarf2_section_info *abbrev_section)
4589 const char *filename = get_section_file_name (section);
4591 if (header->version < 2 || header->version > 5)
4592 error (_("Dwarf Error: wrong version in compilation unit header "
4593 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
4596 if (to_underlying (header->abbrev_sect_off)
4597 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4598 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
4599 "(offset 0x%x + 6) [in module %s]"),
4600 to_underlying (header->abbrev_sect_off),
4601 to_underlying (header->sect_off),
4604 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
4605 avoid potential 32-bit overflow. */
4606 if (((ULONGEST) header->sect_off + get_cu_length (header))
4608 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
4609 "(offset 0x%x + 0) [in module %s]"),
4610 header->length, to_underlying (header->sect_off),
4614 /* Read in a CU/TU header and perform some basic error checking.
4615 The contents of the header are stored in HEADER.
4616 The result is a pointer to the start of the first DIE. */
4618 static const gdb_byte *
4619 read_and_check_comp_unit_head (struct comp_unit_head *header,
4620 struct dwarf2_section_info *section,
4621 struct dwarf2_section_info *abbrev_section,
4622 const gdb_byte *info_ptr,
4623 rcuh_kind section_kind)
4625 const gdb_byte *beg_of_comp_unit = info_ptr;
4626 bfd *abfd = get_section_bfd_owner (section);
4628 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
4630 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
4632 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
4634 error_check_comp_unit_head (header, section, abbrev_section);
4639 /* Fetch the abbreviation table offset from a comp or type unit header. */
4642 read_abbrev_offset (struct dwarf2_section_info *section,
4643 sect_offset sect_off)
4645 bfd *abfd = get_section_bfd_owner (section);
4646 const gdb_byte *info_ptr;
4647 unsigned int initial_length_size, offset_size;
4650 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4651 info_ptr = section->buffer + to_underlying (sect_off);
4652 read_initial_length (abfd, info_ptr, &initial_length_size);
4653 offset_size = initial_length_size == 4 ? 4 : 8;
4654 info_ptr += initial_length_size;
4656 version = read_2_bytes (abfd, info_ptr);
4660 /* Skip unit type and address size. */
4664 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
4667 /* Allocate a new partial symtab for file named NAME and mark this new
4668 partial symtab as being an include of PST. */
4671 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4672 struct objfile *objfile)
4674 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4676 if (!IS_ABSOLUTE_PATH (subpst->filename))
4678 /* It shares objfile->objfile_obstack. */
4679 subpst->dirname = pst->dirname;
4682 subpst->textlow = 0;
4683 subpst->texthigh = 0;
4685 subpst->dependencies
4686 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
4687 subpst->dependencies[0] = pst;
4688 subpst->number_of_dependencies = 1;
4690 subpst->globals_offset = 0;
4691 subpst->n_global_syms = 0;
4692 subpst->statics_offset = 0;
4693 subpst->n_static_syms = 0;
4694 subpst->compunit_symtab = NULL;
4695 subpst->read_symtab = pst->read_symtab;
4698 /* No private part is necessary for include psymtabs. This property
4699 can be used to differentiate between such include psymtabs and
4700 the regular ones. */
4701 subpst->read_symtab_private = NULL;
4704 /* Read the Line Number Program data and extract the list of files
4705 included by the source file represented by PST. Build an include
4706 partial symtab for each of these included files. */
4709 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4710 struct die_info *die,
4711 struct partial_symtab *pst)
4714 struct attribute *attr;
4716 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4718 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
4720 return; /* No linetable, so no includes. */
4722 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4723 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
4727 hash_signatured_type (const void *item)
4729 const struct signatured_type *sig_type
4730 = (const struct signatured_type *) item;
4732 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4733 return sig_type->signature;
4737 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4739 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
4740 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
4742 return lhs->signature == rhs->signature;
4745 /* Allocate a hash table for signatured types. */
4748 allocate_signatured_type_table (struct objfile *objfile)
4750 return htab_create_alloc_ex (41,
4751 hash_signatured_type,
4754 &objfile->objfile_obstack,
4755 hashtab_obstack_allocate,
4756 dummy_obstack_deallocate);
4759 /* A helper function to add a signatured type CU to a table. */
4762 add_signatured_type_cu_to_table (void **slot, void *datum)
4764 struct signatured_type *sigt = (struct signatured_type *) *slot;
4765 struct signatured_type ***datap = (struct signatured_type ***) datum;
4773 /* A helper for create_debug_types_hash_table. Read types from SECTION
4774 and fill them into TYPES_HTAB. It will process only type units,
4775 therefore DW_UT_type. */
4778 create_debug_type_hash_table (struct dwo_file *dwo_file,
4779 dwarf2_section_info *section, htab_t &types_htab,
4780 rcuh_kind section_kind)
4782 struct objfile *objfile = dwarf2_per_objfile->objfile;
4783 struct dwarf2_section_info *abbrev_section;
4785 const gdb_byte *info_ptr, *end_ptr;
4787 abbrev_section = (dwo_file != NULL
4788 ? &dwo_file->sections.abbrev
4789 : &dwarf2_per_objfile->abbrev);
4791 if (dwarf_read_debug)
4792 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
4793 get_section_name (section),
4794 get_section_file_name (abbrev_section));
4796 dwarf2_read_section (objfile, section);
4797 info_ptr = section->buffer;
4799 if (info_ptr == NULL)
4802 /* We can't set abfd until now because the section may be empty or
4803 not present, in which case the bfd is unknown. */
4804 abfd = get_section_bfd_owner (section);
4806 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4807 because we don't need to read any dies: the signature is in the
4810 end_ptr = info_ptr + section->size;
4811 while (info_ptr < end_ptr)
4813 struct signatured_type *sig_type;
4814 struct dwo_unit *dwo_tu;
4816 const gdb_byte *ptr = info_ptr;
4817 struct comp_unit_head header;
4818 unsigned int length;
4820 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
4822 /* Initialize it due to a false compiler warning. */
4823 header.signature = -1;
4824 header.type_cu_offset_in_tu = (cu_offset) -1;
4826 /* We need to read the type's signature in order to build the hash
4827 table, but we don't need anything else just yet. */
4829 ptr = read_and_check_comp_unit_head (&header, section,
4830 abbrev_section, ptr, section_kind);
4832 length = get_cu_length (&header);
4834 /* Skip dummy type units. */
4835 if (ptr >= info_ptr + length
4836 || peek_abbrev_code (abfd, ptr) == 0
4837 || header.unit_type != DW_UT_type)
4843 if (types_htab == NULL)
4846 types_htab = allocate_dwo_unit_table (objfile);
4848 types_htab = allocate_signatured_type_table (objfile);
4854 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4856 dwo_tu->dwo_file = dwo_file;
4857 dwo_tu->signature = header.signature;
4858 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
4859 dwo_tu->section = section;
4860 dwo_tu->sect_off = sect_off;
4861 dwo_tu->length = length;
4865 /* N.B.: type_offset is not usable if this type uses a DWO file.
4866 The real type_offset is in the DWO file. */
4868 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4869 struct signatured_type);
4870 sig_type->signature = header.signature;
4871 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
4872 sig_type->per_cu.objfile = objfile;
4873 sig_type->per_cu.is_debug_types = 1;
4874 sig_type->per_cu.section = section;
4875 sig_type->per_cu.sect_off = sect_off;
4876 sig_type->per_cu.length = length;
4879 slot = htab_find_slot (types_htab,
4880 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4882 gdb_assert (slot != NULL);
4885 sect_offset dup_sect_off;
4889 const struct dwo_unit *dup_tu
4890 = (const struct dwo_unit *) *slot;
4892 dup_sect_off = dup_tu->sect_off;
4896 const struct signatured_type *dup_tu
4897 = (const struct signatured_type *) *slot;
4899 dup_sect_off = dup_tu->per_cu.sect_off;
4902 complaint (&symfile_complaints,
4903 _("debug type entry at offset 0x%x is duplicate to"
4904 " the entry at offset 0x%x, signature %s"),
4905 to_underlying (sect_off), to_underlying (dup_sect_off),
4906 hex_string (header.signature));
4908 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4910 if (dwarf_read_debug > 1)
4911 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4912 to_underlying (sect_off),
4913 hex_string (header.signature));
4919 /* Create the hash table of all entries in the .debug_types
4920 (or .debug_types.dwo) section(s).
4921 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4922 otherwise it is NULL.
4924 The result is a pointer to the hash table or NULL if there are no types.
4926 Note: This function processes DWO files only, not DWP files. */
4929 create_debug_types_hash_table (struct dwo_file *dwo_file,
4930 VEC (dwarf2_section_info_def) *types,
4934 struct dwarf2_section_info *section;
4936 if (VEC_empty (dwarf2_section_info_def, types))
4940 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4942 create_debug_type_hash_table (dwo_file, section, types_htab,
4946 /* Create the hash table of all entries in the .debug_types section,
4947 and initialize all_type_units.
4948 The result is zero if there is an error (e.g. missing .debug_types section),
4949 otherwise non-zero. */
4952 create_all_type_units (struct objfile *objfile)
4954 htab_t types_htab = NULL;
4955 struct signatured_type **iter;
4957 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
4958 rcuh_kind::COMPILE);
4959 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
4960 if (types_htab == NULL)
4962 dwarf2_per_objfile->signatured_types = NULL;
4966 dwarf2_per_objfile->signatured_types = types_htab;
4968 dwarf2_per_objfile->n_type_units
4969 = dwarf2_per_objfile->n_allocated_type_units
4970 = htab_elements (types_htab);
4971 dwarf2_per_objfile->all_type_units =
4972 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
4973 iter = &dwarf2_per_objfile->all_type_units[0];
4974 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4975 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4976 == dwarf2_per_objfile->n_type_units);
4981 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
4982 If SLOT is non-NULL, it is the entry to use in the hash table.
4983 Otherwise we find one. */
4985 static struct signatured_type *
4986 add_type_unit (ULONGEST sig, void **slot)
4988 struct objfile *objfile = dwarf2_per_objfile->objfile;
4989 int n_type_units = dwarf2_per_objfile->n_type_units;
4990 struct signatured_type *sig_type;
4992 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
4994 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
4996 if (dwarf2_per_objfile->n_allocated_type_units == 0)
4997 dwarf2_per_objfile->n_allocated_type_units = 1;
4998 dwarf2_per_objfile->n_allocated_type_units *= 2;
4999 dwarf2_per_objfile->all_type_units
5000 = XRESIZEVEC (struct signatured_type *,
5001 dwarf2_per_objfile->all_type_units,
5002 dwarf2_per_objfile->n_allocated_type_units);
5003 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5005 dwarf2_per_objfile->n_type_units = n_type_units;
5007 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5008 struct signatured_type);
5009 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5010 sig_type->signature = sig;
5011 sig_type->per_cu.is_debug_types = 1;
5012 if (dwarf2_per_objfile->using_index)
5014 sig_type->per_cu.v.quick =
5015 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5016 struct dwarf2_per_cu_quick_data);
5021 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5024 gdb_assert (*slot == NULL);
5026 /* The rest of sig_type must be filled in by the caller. */
5030 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5031 Fill in SIG_ENTRY with DWO_ENTRY. */
5034 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5035 struct signatured_type *sig_entry,
5036 struct dwo_unit *dwo_entry)
5038 /* Make sure we're not clobbering something we don't expect to. */
5039 gdb_assert (! sig_entry->per_cu.queued);
5040 gdb_assert (sig_entry->per_cu.cu == NULL);
5041 if (dwarf2_per_objfile->using_index)
5043 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5044 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5047 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5048 gdb_assert (sig_entry->signature == dwo_entry->signature);
5049 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5050 gdb_assert (sig_entry->type_unit_group == NULL);
5051 gdb_assert (sig_entry->dwo_unit == NULL);
5053 sig_entry->per_cu.section = dwo_entry->section;
5054 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5055 sig_entry->per_cu.length = dwo_entry->length;
5056 sig_entry->per_cu.reading_dwo_directly = 1;
5057 sig_entry->per_cu.objfile = objfile;
5058 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5059 sig_entry->dwo_unit = dwo_entry;
5062 /* Subroutine of lookup_signatured_type.
5063 If we haven't read the TU yet, create the signatured_type data structure
5064 for a TU to be read in directly from a DWO file, bypassing the stub.
5065 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5066 using .gdb_index, then when reading a CU we want to stay in the DWO file
5067 containing that CU. Otherwise we could end up reading several other DWO
5068 files (due to comdat folding) to process the transitive closure of all the
5069 mentioned TUs, and that can be slow. The current DWO file will have every
5070 type signature that it needs.
5071 We only do this for .gdb_index because in the psymtab case we already have
5072 to read all the DWOs to build the type unit groups. */
5074 static struct signatured_type *
5075 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5077 struct objfile *objfile = dwarf2_per_objfile->objfile;
5078 struct dwo_file *dwo_file;
5079 struct dwo_unit find_dwo_entry, *dwo_entry;
5080 struct signatured_type find_sig_entry, *sig_entry;
5083 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5085 /* If TU skeletons have been removed then we may not have read in any
5087 if (dwarf2_per_objfile->signatured_types == NULL)
5089 dwarf2_per_objfile->signatured_types
5090 = allocate_signatured_type_table (objfile);
5093 /* We only ever need to read in one copy of a signatured type.
5094 Use the global signatured_types array to do our own comdat-folding
5095 of types. If this is the first time we're reading this TU, and
5096 the TU has an entry in .gdb_index, replace the recorded data from
5097 .gdb_index with this TU. */
5099 find_sig_entry.signature = sig;
5100 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5101 &find_sig_entry, INSERT);
5102 sig_entry = (struct signatured_type *) *slot;
5104 /* We can get here with the TU already read, *or* in the process of being
5105 read. Don't reassign the global entry to point to this DWO if that's
5106 the case. Also note that if the TU is already being read, it may not
5107 have come from a DWO, the program may be a mix of Fission-compiled
5108 code and non-Fission-compiled code. */
5110 /* Have we already tried to read this TU?
5111 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5112 needn't exist in the global table yet). */
5113 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
5116 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
5117 dwo_unit of the TU itself. */
5118 dwo_file = cu->dwo_unit->dwo_file;
5120 /* Ok, this is the first time we're reading this TU. */
5121 if (dwo_file->tus == NULL)
5123 find_dwo_entry.signature = sig;
5124 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
5125 if (dwo_entry == NULL)
5128 /* If the global table doesn't have an entry for this TU, add one. */
5129 if (sig_entry == NULL)
5130 sig_entry = add_type_unit (sig, slot);
5132 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5133 sig_entry->per_cu.tu_read = 1;
5137 /* Subroutine of lookup_signatured_type.
5138 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
5139 then try the DWP file. If the TU stub (skeleton) has been removed then
5140 it won't be in .gdb_index. */
5142 static struct signatured_type *
5143 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5145 struct objfile *objfile = dwarf2_per_objfile->objfile;
5146 struct dwp_file *dwp_file = get_dwp_file ();
5147 struct dwo_unit *dwo_entry;
5148 struct signatured_type find_sig_entry, *sig_entry;
5151 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5152 gdb_assert (dwp_file != NULL);
5154 /* If TU skeletons have been removed then we may not have read in any
5156 if (dwarf2_per_objfile->signatured_types == NULL)
5158 dwarf2_per_objfile->signatured_types
5159 = allocate_signatured_type_table (objfile);
5162 find_sig_entry.signature = sig;
5163 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5164 &find_sig_entry, INSERT);
5165 sig_entry = (struct signatured_type *) *slot;
5167 /* Have we already tried to read this TU?
5168 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5169 needn't exist in the global table yet). */
5170 if (sig_entry != NULL)
5173 if (dwp_file->tus == NULL)
5175 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5176 sig, 1 /* is_debug_types */);
5177 if (dwo_entry == NULL)
5180 sig_entry = add_type_unit (sig, slot);
5181 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5186 /* Lookup a signature based type for DW_FORM_ref_sig8.
5187 Returns NULL if signature SIG is not present in the table.
5188 It is up to the caller to complain about this. */
5190 static struct signatured_type *
5191 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5194 && dwarf2_per_objfile->using_index)
5196 /* We're in a DWO/DWP file, and we're using .gdb_index.
5197 These cases require special processing. */
5198 if (get_dwp_file () == NULL)
5199 return lookup_dwo_signatured_type (cu, sig);
5201 return lookup_dwp_signatured_type (cu, sig);
5205 struct signatured_type find_entry, *entry;
5207 if (dwarf2_per_objfile->signatured_types == NULL)
5209 find_entry.signature = sig;
5210 entry = ((struct signatured_type *)
5211 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5216 /* Low level DIE reading support. */
5218 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5221 init_cu_die_reader (struct die_reader_specs *reader,
5222 struct dwarf2_cu *cu,
5223 struct dwarf2_section_info *section,
5224 struct dwo_file *dwo_file)
5226 gdb_assert (section->readin && section->buffer != NULL);
5227 reader->abfd = get_section_bfd_owner (section);
5229 reader->dwo_file = dwo_file;
5230 reader->die_section = section;
5231 reader->buffer = section->buffer;
5232 reader->buffer_end = section->buffer + section->size;
5233 reader->comp_dir = NULL;
5236 /* Subroutine of init_cutu_and_read_dies to simplify it.
5237 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5238 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5241 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5242 from it to the DIE in the DWO. If NULL we are skipping the stub.
5243 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5244 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5245 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5246 STUB_COMP_DIR may be non-NULL.
5247 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5248 are filled in with the info of the DIE from the DWO file.
5249 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5250 provided an abbrev table to use.
5251 The result is non-zero if a valid (non-dummy) DIE was found. */
5254 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5255 struct dwo_unit *dwo_unit,
5256 int abbrev_table_provided,
5257 struct die_info *stub_comp_unit_die,
5258 const char *stub_comp_dir,
5259 struct die_reader_specs *result_reader,
5260 const gdb_byte **result_info_ptr,
5261 struct die_info **result_comp_unit_die,
5262 int *result_has_children)
5264 struct objfile *objfile = dwarf2_per_objfile->objfile;
5265 struct dwarf2_cu *cu = this_cu->cu;
5266 struct dwarf2_section_info *section;
5268 const gdb_byte *begin_info_ptr, *info_ptr;
5269 ULONGEST signature; /* Or dwo_id. */
5270 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5271 int i,num_extra_attrs;
5272 struct dwarf2_section_info *dwo_abbrev_section;
5273 struct attribute *attr;
5274 struct die_info *comp_unit_die;
5276 /* At most one of these may be provided. */
5277 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5279 /* These attributes aren't processed until later:
5280 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5281 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5282 referenced later. However, these attributes are found in the stub
5283 which we won't have later. In order to not impose this complication
5284 on the rest of the code, we read them here and copy them to the
5293 if (stub_comp_unit_die != NULL)
5295 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5297 if (! this_cu->is_debug_types)
5298 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5299 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5300 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5301 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5302 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5304 /* There should be a DW_AT_addr_base attribute here (if needed).
5305 We need the value before we can process DW_FORM_GNU_addr_index. */
5307 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5309 cu->addr_base = DW_UNSND (attr);
5311 /* There should be a DW_AT_ranges_base attribute here (if needed).
5312 We need the value before we can process DW_AT_ranges. */
5313 cu->ranges_base = 0;
5314 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5316 cu->ranges_base = DW_UNSND (attr);
5318 else if (stub_comp_dir != NULL)
5320 /* Reconstruct the comp_dir attribute to simplify the code below. */
5321 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5322 comp_dir->name = DW_AT_comp_dir;
5323 comp_dir->form = DW_FORM_string;
5324 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5325 DW_STRING (comp_dir) = stub_comp_dir;
5328 /* Set up for reading the DWO CU/TU. */
5329 cu->dwo_unit = dwo_unit;
5330 section = dwo_unit->section;
5331 dwarf2_read_section (objfile, section);
5332 abfd = get_section_bfd_owner (section);
5333 begin_info_ptr = info_ptr = (section->buffer
5334 + to_underlying (dwo_unit->sect_off));
5335 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5336 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5338 if (this_cu->is_debug_types)
5340 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5342 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5344 info_ptr, rcuh_kind::TYPE);
5345 /* This is not an assert because it can be caused by bad debug info. */
5346 if (sig_type->signature != cu->header.signature)
5348 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5349 " TU at offset 0x%x [in module %s]"),
5350 hex_string (sig_type->signature),
5351 hex_string (cu->header.signature),
5352 to_underlying (dwo_unit->sect_off),
5353 bfd_get_filename (abfd));
5355 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5356 /* For DWOs coming from DWP files, we don't know the CU length
5357 nor the type's offset in the TU until now. */
5358 dwo_unit->length = get_cu_length (&cu->header);
5359 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
5361 /* Establish the type offset that can be used to lookup the type.
5362 For DWO files, we don't know it until now. */
5363 sig_type->type_offset_in_section
5364 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
5368 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5370 info_ptr, rcuh_kind::COMPILE);
5371 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5372 /* For DWOs coming from DWP files, we don't know the CU length
5374 dwo_unit->length = get_cu_length (&cu->header);
5377 /* Replace the CU's original abbrev table with the DWO's.
5378 Reminder: We can't read the abbrev table until we've read the header. */
5379 if (abbrev_table_provided)
5381 /* Don't free the provided abbrev table, the caller of
5382 init_cutu_and_read_dies owns it. */
5383 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5384 /* Ensure the DWO abbrev table gets freed. */
5385 make_cleanup (dwarf2_free_abbrev_table, cu);
5389 dwarf2_free_abbrev_table (cu);
5390 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5391 /* Leave any existing abbrev table cleanup as is. */
5394 /* Read in the die, but leave space to copy over the attributes
5395 from the stub. This has the benefit of simplifying the rest of
5396 the code - all the work to maintain the illusion of a single
5397 DW_TAG_{compile,type}_unit DIE is done here. */
5398 num_extra_attrs = ((stmt_list != NULL)
5402 + (comp_dir != NULL));
5403 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5404 result_has_children, num_extra_attrs);
5406 /* Copy over the attributes from the stub to the DIE we just read in. */
5407 comp_unit_die = *result_comp_unit_die;
5408 i = comp_unit_die->num_attrs;
5409 if (stmt_list != NULL)
5410 comp_unit_die->attrs[i++] = *stmt_list;
5412 comp_unit_die->attrs[i++] = *low_pc;
5413 if (high_pc != NULL)
5414 comp_unit_die->attrs[i++] = *high_pc;
5416 comp_unit_die->attrs[i++] = *ranges;
5417 if (comp_dir != NULL)
5418 comp_unit_die->attrs[i++] = *comp_dir;
5419 comp_unit_die->num_attrs += num_extra_attrs;
5421 if (dwarf_die_debug)
5423 fprintf_unfiltered (gdb_stdlog,
5424 "Read die from %s@0x%x of %s:\n",
5425 get_section_name (section),
5426 (unsigned) (begin_info_ptr - section->buffer),
5427 bfd_get_filename (abfd));
5428 dump_die (comp_unit_die, dwarf_die_debug);
5431 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5432 TUs by skipping the stub and going directly to the entry in the DWO file.
5433 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5434 to get it via circuitous means. Blech. */
5435 if (comp_dir != NULL)
5436 result_reader->comp_dir = DW_STRING (comp_dir);
5438 /* Skip dummy compilation units. */
5439 if (info_ptr >= begin_info_ptr + dwo_unit->length
5440 || peek_abbrev_code (abfd, info_ptr) == 0)
5443 *result_info_ptr = info_ptr;
5447 /* Subroutine of init_cutu_and_read_dies to simplify it.
5448 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5449 Returns NULL if the specified DWO unit cannot be found. */
5451 static struct dwo_unit *
5452 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5453 struct die_info *comp_unit_die)
5455 struct dwarf2_cu *cu = this_cu->cu;
5456 struct attribute *attr;
5458 struct dwo_unit *dwo_unit;
5459 const char *comp_dir, *dwo_name;
5461 gdb_assert (cu != NULL);
5463 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5464 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5465 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5467 if (this_cu->is_debug_types)
5469 struct signatured_type *sig_type;
5471 /* Since this_cu is the first member of struct signatured_type,
5472 we can go from a pointer to one to a pointer to the other. */
5473 sig_type = (struct signatured_type *) this_cu;
5474 signature = sig_type->signature;
5475 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5479 struct attribute *attr;
5481 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5483 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5485 dwo_name, objfile_name (this_cu->objfile));
5486 signature = DW_UNSND (attr);
5487 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5494 /* Subroutine of init_cutu_and_read_dies to simplify it.
5495 See it for a description of the parameters.
5496 Read a TU directly from a DWO file, bypassing the stub.
5498 Note: This function could be a little bit simpler if we shared cleanups
5499 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
5500 to do, so we keep this function self-contained. Or we could move this
5501 into our caller, but it's complex enough already. */
5504 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
5505 int use_existing_cu, int keep,
5506 die_reader_func_ftype *die_reader_func,
5509 struct dwarf2_cu *cu;
5510 struct signatured_type *sig_type;
5511 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5512 struct die_reader_specs reader;
5513 const gdb_byte *info_ptr;
5514 struct die_info *comp_unit_die;
5517 /* Verify we can do the following downcast, and that we have the
5519 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5520 sig_type = (struct signatured_type *) this_cu;
5521 gdb_assert (sig_type->dwo_unit != NULL);
5523 cleanups = make_cleanup (null_cleanup, NULL);
5525 if (use_existing_cu && this_cu->cu != NULL)
5527 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
5529 /* There's no need to do the rereading_dwo_cu handling that
5530 init_cutu_and_read_dies does since we don't read the stub. */
5534 /* If !use_existing_cu, this_cu->cu must be NULL. */
5535 gdb_assert (this_cu->cu == NULL);
5536 cu = XNEW (struct dwarf2_cu);
5537 init_one_comp_unit (cu, this_cu);
5538 /* If an error occurs while loading, release our storage. */
5539 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5542 /* A future optimization, if needed, would be to use an existing
5543 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
5544 could share abbrev tables. */
5546 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5547 0 /* abbrev_table_provided */,
5548 NULL /* stub_comp_unit_die */,
5549 sig_type->dwo_unit->dwo_file->comp_dir,
5551 &comp_unit_die, &has_children) == 0)
5554 do_cleanups (cleanups);
5558 /* All the "real" work is done here. */
5559 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5561 /* This duplicates the code in init_cutu_and_read_dies,
5562 but the alternative is making the latter more complex.
5563 This function is only for the special case of using DWO files directly:
5564 no point in overly complicating the general case just to handle this. */
5565 if (free_cu_cleanup != NULL)
5569 /* We've successfully allocated this compilation unit. Let our
5570 caller clean it up when finished with it. */
5571 discard_cleanups (free_cu_cleanup);
5573 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5574 So we have to manually free the abbrev table. */
5575 dwarf2_free_abbrev_table (cu);
5577 /* Link this CU into read_in_chain. */
5578 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5579 dwarf2_per_objfile->read_in_chain = this_cu;
5582 do_cleanups (free_cu_cleanup);
5585 do_cleanups (cleanups);
5588 /* Initialize a CU (or TU) and read its DIEs.
5589 If the CU defers to a DWO file, read the DWO file as well.
5591 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5592 Otherwise the table specified in the comp unit header is read in and used.
5593 This is an optimization for when we already have the abbrev table.
5595 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5596 Otherwise, a new CU is allocated with xmalloc.
5598 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5599 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5601 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5602 linker) then DIE_READER_FUNC will not get called. */
5605 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5606 struct abbrev_table *abbrev_table,
5607 int use_existing_cu, int keep,
5608 die_reader_func_ftype *die_reader_func,
5611 struct objfile *objfile = dwarf2_per_objfile->objfile;
5612 struct dwarf2_section_info *section = this_cu->section;
5613 bfd *abfd = get_section_bfd_owner (section);
5614 struct dwarf2_cu *cu;
5615 const gdb_byte *begin_info_ptr, *info_ptr;
5616 struct die_reader_specs reader;
5617 struct die_info *comp_unit_die;
5619 struct attribute *attr;
5620 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5621 struct signatured_type *sig_type = NULL;
5622 struct dwarf2_section_info *abbrev_section;
5623 /* Non-zero if CU currently points to a DWO file and we need to
5624 reread it. When this happens we need to reread the skeleton die
5625 before we can reread the DWO file (this only applies to CUs, not TUs). */
5626 int rereading_dwo_cu = 0;
5628 if (dwarf_die_debug)
5629 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5630 this_cu->is_debug_types ? "type" : "comp",
5631 to_underlying (this_cu->sect_off));
5633 if (use_existing_cu)
5636 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5637 file (instead of going through the stub), short-circuit all of this. */
5638 if (this_cu->reading_dwo_directly)
5640 /* Narrow down the scope of possibilities to have to understand. */
5641 gdb_assert (this_cu->is_debug_types);
5642 gdb_assert (abbrev_table == NULL);
5643 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
5644 die_reader_func, data);
5648 cleanups = make_cleanup (null_cleanup, NULL);
5650 /* This is cheap if the section is already read in. */
5651 dwarf2_read_section (objfile, section);
5653 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5655 abbrev_section = get_abbrev_section_for_cu (this_cu);
5657 if (use_existing_cu && this_cu->cu != NULL)
5660 /* If this CU is from a DWO file we need to start over, we need to
5661 refetch the attributes from the skeleton CU.
5662 This could be optimized by retrieving those attributes from when we
5663 were here the first time: the previous comp_unit_die was stored in
5664 comp_unit_obstack. But there's no data yet that we need this
5666 if (cu->dwo_unit != NULL)
5667 rereading_dwo_cu = 1;
5671 /* If !use_existing_cu, this_cu->cu must be NULL. */
5672 gdb_assert (this_cu->cu == NULL);
5673 cu = XNEW (struct dwarf2_cu);
5674 init_one_comp_unit (cu, this_cu);
5675 /* If an error occurs while loading, release our storage. */
5676 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5679 /* Get the header. */
5680 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
5682 /* We already have the header, there's no need to read it in again. */
5683 info_ptr += to_underlying (cu->header.first_die_cu_offset);
5687 if (this_cu->is_debug_types)
5689 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5690 abbrev_section, info_ptr,
5693 /* Since per_cu is the first member of struct signatured_type,
5694 we can go from a pointer to one to a pointer to the other. */
5695 sig_type = (struct signatured_type *) this_cu;
5696 gdb_assert (sig_type->signature == cu->header.signature);
5697 gdb_assert (sig_type->type_offset_in_tu
5698 == cu->header.type_cu_offset_in_tu);
5699 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5701 /* LENGTH has not been set yet for type units if we're
5702 using .gdb_index. */
5703 this_cu->length = get_cu_length (&cu->header);
5705 /* Establish the type offset that can be used to lookup the type. */
5706 sig_type->type_offset_in_section =
5707 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
5709 this_cu->dwarf_version = cu->header.version;
5713 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5716 rcuh_kind::COMPILE);
5718 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5719 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5720 this_cu->dwarf_version = cu->header.version;
5724 /* Skip dummy compilation units. */
5725 if (info_ptr >= begin_info_ptr + this_cu->length
5726 || peek_abbrev_code (abfd, info_ptr) == 0)
5728 do_cleanups (cleanups);
5732 /* If we don't have them yet, read the abbrevs for this compilation unit.
5733 And if we need to read them now, make sure they're freed when we're
5734 done. Note that it's important that if the CU had an abbrev table
5735 on entry we don't free it when we're done: Somewhere up the call stack
5736 it may be in use. */
5737 if (abbrev_table != NULL)
5739 gdb_assert (cu->abbrev_table == NULL);
5740 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
5741 cu->abbrev_table = abbrev_table;
5743 else if (cu->abbrev_table == NULL)
5745 dwarf2_read_abbrevs (cu, abbrev_section);
5746 make_cleanup (dwarf2_free_abbrev_table, cu);
5748 else if (rereading_dwo_cu)
5750 dwarf2_free_abbrev_table (cu);
5751 dwarf2_read_abbrevs (cu, abbrev_section);
5754 /* Read the top level CU/TU die. */
5755 init_cu_die_reader (&reader, cu, section, NULL);
5756 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5758 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5760 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5761 DWO CU, that this test will fail (the attribute will not be present). */
5762 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5765 struct dwo_unit *dwo_unit;
5766 struct die_info *dwo_comp_unit_die;
5770 complaint (&symfile_complaints,
5771 _("compilation unit with DW_AT_GNU_dwo_name"
5772 " has children (offset 0x%x) [in module %s]"),
5773 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
5775 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5776 if (dwo_unit != NULL)
5778 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5779 abbrev_table != NULL,
5780 comp_unit_die, NULL,
5782 &dwo_comp_unit_die, &has_children) == 0)
5785 do_cleanups (cleanups);
5788 comp_unit_die = dwo_comp_unit_die;
5792 /* Yikes, we couldn't find the rest of the DIE, we only have
5793 the stub. A complaint has already been logged. There's
5794 not much more we can do except pass on the stub DIE to
5795 die_reader_func. We don't want to throw an error on bad
5800 /* All of the above is setup for this call. Yikes. */
5801 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5803 /* Done, clean up. */
5804 if (free_cu_cleanup != NULL)
5808 /* We've successfully allocated this compilation unit. Let our
5809 caller clean it up when finished with it. */
5810 discard_cleanups (free_cu_cleanup);
5812 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5813 So we have to manually free the abbrev table. */
5814 dwarf2_free_abbrev_table (cu);
5816 /* Link this CU into read_in_chain. */
5817 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5818 dwarf2_per_objfile->read_in_chain = this_cu;
5821 do_cleanups (free_cu_cleanup);
5824 do_cleanups (cleanups);
5827 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5828 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5829 to have already done the lookup to find the DWO file).
5831 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5832 THIS_CU->is_debug_types, but nothing else.
5834 We fill in THIS_CU->length.
5836 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5837 linker) then DIE_READER_FUNC will not get called.
5839 THIS_CU->cu is always freed when done.
5840 This is done in order to not leave THIS_CU->cu in a state where we have
5841 to care whether it refers to the "main" CU or the DWO CU. */
5844 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5845 struct dwo_file *dwo_file,
5846 die_reader_func_ftype *die_reader_func,
5849 struct objfile *objfile = dwarf2_per_objfile->objfile;
5850 struct dwarf2_section_info *section = this_cu->section;
5851 bfd *abfd = get_section_bfd_owner (section);
5852 struct dwarf2_section_info *abbrev_section;
5853 struct dwarf2_cu cu;
5854 const gdb_byte *begin_info_ptr, *info_ptr;
5855 struct die_reader_specs reader;
5856 struct cleanup *cleanups;
5857 struct die_info *comp_unit_die;
5860 if (dwarf_die_debug)
5861 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5862 this_cu->is_debug_types ? "type" : "comp",
5863 to_underlying (this_cu->sect_off));
5865 gdb_assert (this_cu->cu == NULL);
5867 abbrev_section = (dwo_file != NULL
5868 ? &dwo_file->sections.abbrev
5869 : get_abbrev_section_for_cu (this_cu));
5871 /* This is cheap if the section is already read in. */
5872 dwarf2_read_section (objfile, section);
5874 init_one_comp_unit (&cu, this_cu);
5876 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5878 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5879 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5880 abbrev_section, info_ptr,
5881 (this_cu->is_debug_types
5883 : rcuh_kind::COMPILE));
5885 this_cu->length = get_cu_length (&cu.header);
5887 /* Skip dummy compilation units. */
5888 if (info_ptr >= begin_info_ptr + this_cu->length
5889 || peek_abbrev_code (abfd, info_ptr) == 0)
5891 do_cleanups (cleanups);
5895 dwarf2_read_abbrevs (&cu, abbrev_section);
5896 make_cleanup (dwarf2_free_abbrev_table, &cu);
5898 init_cu_die_reader (&reader, &cu, section, dwo_file);
5899 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5901 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5903 do_cleanups (cleanups);
5906 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5907 does not lookup the specified DWO file.
5908 This cannot be used to read DWO files.
5910 THIS_CU->cu is always freed when done.
5911 This is done in order to not leave THIS_CU->cu in a state where we have
5912 to care whether it refers to the "main" CU or the DWO CU.
5913 We can revisit this if the data shows there's a performance issue. */
5916 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5917 die_reader_func_ftype *die_reader_func,
5920 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5923 /* Type Unit Groups.
5925 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5926 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5927 so that all types coming from the same compilation (.o file) are grouped
5928 together. A future step could be to put the types in the same symtab as
5929 the CU the types ultimately came from. */
5932 hash_type_unit_group (const void *item)
5934 const struct type_unit_group *tu_group
5935 = (const struct type_unit_group *) item;
5937 return hash_stmt_list_entry (&tu_group->hash);
5941 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5943 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
5944 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
5946 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5949 /* Allocate a hash table for type unit groups. */
5952 allocate_type_unit_groups_table (void)
5954 return htab_create_alloc_ex (3,
5955 hash_type_unit_group,
5958 &dwarf2_per_objfile->objfile->objfile_obstack,
5959 hashtab_obstack_allocate,
5960 dummy_obstack_deallocate);
5963 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5964 partial symtabs. We combine several TUs per psymtab to not let the size
5965 of any one psymtab grow too big. */
5966 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5967 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5969 /* Helper routine for get_type_unit_group.
5970 Create the type_unit_group object used to hold one or more TUs. */
5972 static struct type_unit_group *
5973 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5975 struct objfile *objfile = dwarf2_per_objfile->objfile;
5976 struct dwarf2_per_cu_data *per_cu;
5977 struct type_unit_group *tu_group;
5979 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5980 struct type_unit_group);
5981 per_cu = &tu_group->per_cu;
5982 per_cu->objfile = objfile;
5984 if (dwarf2_per_objfile->using_index)
5986 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5987 struct dwarf2_per_cu_quick_data);
5991 unsigned int line_offset = to_underlying (line_offset_struct);
5992 struct partial_symtab *pst;
5995 /* Give the symtab a useful name for debug purposes. */
5996 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5997 name = xstrprintf ("<type_units_%d>",
5998 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6000 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6002 pst = create_partial_symtab (per_cu, name);
6008 tu_group->hash.dwo_unit = cu->dwo_unit;
6009 tu_group->hash.line_sect_off = line_offset_struct;
6014 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6015 STMT_LIST is a DW_AT_stmt_list attribute. */
6017 static struct type_unit_group *
6018 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6020 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6021 struct type_unit_group *tu_group;
6023 unsigned int line_offset;
6024 struct type_unit_group type_unit_group_for_lookup;
6026 if (dwarf2_per_objfile->type_unit_groups == NULL)
6028 dwarf2_per_objfile->type_unit_groups =
6029 allocate_type_unit_groups_table ();
6032 /* Do we need to create a new group, or can we use an existing one? */
6036 line_offset = DW_UNSND (stmt_list);
6037 ++tu_stats->nr_symtab_sharers;
6041 /* Ugh, no stmt_list. Rare, but we have to handle it.
6042 We can do various things here like create one group per TU or
6043 spread them over multiple groups to split up the expansion work.
6044 To avoid worst case scenarios (too many groups or too large groups)
6045 we, umm, group them in bunches. */
6046 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6047 | (tu_stats->nr_stmt_less_type_units
6048 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6049 ++tu_stats->nr_stmt_less_type_units;
6052 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6053 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6054 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6055 &type_unit_group_for_lookup, INSERT);
6058 tu_group = (struct type_unit_group *) *slot;
6059 gdb_assert (tu_group != NULL);
6063 sect_offset line_offset_struct = (sect_offset) line_offset;
6064 tu_group = create_type_unit_group (cu, line_offset_struct);
6066 ++tu_stats->nr_symtabs;
6072 /* Partial symbol tables. */
6074 /* Create a psymtab named NAME and assign it to PER_CU.
6076 The caller must fill in the following details:
6077 dirname, textlow, texthigh. */
6079 static struct partial_symtab *
6080 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
6082 struct objfile *objfile = per_cu->objfile;
6083 struct partial_symtab *pst;
6085 pst = start_psymtab_common (objfile, name, 0,
6086 objfile->global_psymbols.next,
6087 objfile->static_psymbols.next);
6089 pst->psymtabs_addrmap_supported = 1;
6091 /* This is the glue that links PST into GDB's symbol API. */
6092 pst->read_symtab_private = per_cu;
6093 pst->read_symtab = dwarf2_read_symtab;
6094 per_cu->v.psymtab = pst;
6099 /* The DATA object passed to process_psymtab_comp_unit_reader has this
6102 struct process_psymtab_comp_unit_data
6104 /* True if we are reading a DW_TAG_partial_unit. */
6106 int want_partial_unit;
6108 /* The "pretend" language that is used if the CU doesn't declare a
6111 enum language pretend_language;
6114 /* die_reader_func for process_psymtab_comp_unit. */
6117 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
6118 const gdb_byte *info_ptr,
6119 struct die_info *comp_unit_die,
6123 struct dwarf2_cu *cu = reader->cu;
6124 struct objfile *objfile = cu->objfile;
6125 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6126 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6128 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6129 struct partial_symtab *pst;
6130 enum pc_bounds_kind cu_bounds_kind;
6131 const char *filename;
6132 struct process_psymtab_comp_unit_data *info
6133 = (struct process_psymtab_comp_unit_data *) data;
6135 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6138 gdb_assert (! per_cu->is_debug_types);
6140 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6142 cu->list_in_scope = &file_symbols;
6144 /* Allocate a new partial symbol table structure. */
6145 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
6146 if (filename == NULL)
6149 pst = create_partial_symtab (per_cu, filename);
6151 /* This must be done before calling dwarf2_build_include_psymtabs. */
6152 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6154 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6156 dwarf2_find_base_address (comp_unit_die, cu);
6158 /* Possibly set the default values of LOWPC and HIGHPC from
6160 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6161 &best_highpc, cu, pst);
6162 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6163 /* Store the contiguous range if it is not empty; it can be empty for
6164 CUs with no code. */
6165 addrmap_set_empty (objfile->psymtabs_addrmap,
6166 gdbarch_adjust_dwarf2_addr (gdbarch,
6167 best_lowpc + baseaddr),
6168 gdbarch_adjust_dwarf2_addr (gdbarch,
6169 best_highpc + baseaddr) - 1,
6172 /* Check if comp unit has_children.
6173 If so, read the rest of the partial symbols from this comp unit.
6174 If not, there's no more debug_info for this comp unit. */
6177 struct partial_die_info *first_die;
6178 CORE_ADDR lowpc, highpc;
6180 lowpc = ((CORE_ADDR) -1);
6181 highpc = ((CORE_ADDR) 0);
6183 first_die = load_partial_dies (reader, info_ptr, 1);
6185 scan_partial_symbols (first_die, &lowpc, &highpc,
6186 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6188 /* If we didn't find a lowpc, set it to highpc to avoid
6189 complaints from `maint check'. */
6190 if (lowpc == ((CORE_ADDR) -1))
6193 /* If the compilation unit didn't have an explicit address range,
6194 then use the information extracted from its child dies. */
6195 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6198 best_highpc = highpc;
6201 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6202 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6204 end_psymtab_common (objfile, pst);
6206 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6209 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6210 struct dwarf2_per_cu_data *iter;
6212 /* Fill in 'dependencies' here; we fill in 'users' in a
6214 pst->number_of_dependencies = len;
6216 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6218 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6221 pst->dependencies[i] = iter->v.psymtab;
6223 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6226 /* Get the list of files included in the current compilation unit,
6227 and build a psymtab for each of them. */
6228 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6230 if (dwarf_read_debug)
6232 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6234 fprintf_unfiltered (gdb_stdlog,
6235 "Psymtab for %s unit @0x%x: %s - %s"
6236 ", %d global, %d static syms\n",
6237 per_cu->is_debug_types ? "type" : "comp",
6238 to_underlying (per_cu->sect_off),
6239 paddress (gdbarch, pst->textlow),
6240 paddress (gdbarch, pst->texthigh),
6241 pst->n_global_syms, pst->n_static_syms);
6245 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6246 Process compilation unit THIS_CU for a psymtab. */
6249 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6250 int want_partial_unit,
6251 enum language pretend_language)
6253 struct process_psymtab_comp_unit_data info;
6255 /* If this compilation unit was already read in, free the
6256 cached copy in order to read it in again. This is
6257 necessary because we skipped some symbols when we first
6258 read in the compilation unit (see load_partial_dies).
6259 This problem could be avoided, but the benefit is unclear. */
6260 if (this_cu->cu != NULL)
6261 free_one_cached_comp_unit (this_cu);
6263 gdb_assert (! this_cu->is_debug_types);
6264 info.want_partial_unit = want_partial_unit;
6265 info.pretend_language = pretend_language;
6266 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6267 process_psymtab_comp_unit_reader,
6270 /* Age out any secondary CUs. */
6271 age_cached_comp_units ();
6274 /* Reader function for build_type_psymtabs. */
6277 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6278 const gdb_byte *info_ptr,
6279 struct die_info *type_unit_die,
6283 struct objfile *objfile = dwarf2_per_objfile->objfile;
6284 struct dwarf2_cu *cu = reader->cu;
6285 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6286 struct signatured_type *sig_type;
6287 struct type_unit_group *tu_group;
6288 struct attribute *attr;
6289 struct partial_die_info *first_die;
6290 CORE_ADDR lowpc, highpc;
6291 struct partial_symtab *pst;
6293 gdb_assert (data == NULL);
6294 gdb_assert (per_cu->is_debug_types);
6295 sig_type = (struct signatured_type *) per_cu;
6300 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6301 tu_group = get_type_unit_group (cu, attr);
6303 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6305 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6306 cu->list_in_scope = &file_symbols;
6307 pst = create_partial_symtab (per_cu, "");
6310 first_die = load_partial_dies (reader, info_ptr, 1);
6312 lowpc = (CORE_ADDR) -1;
6313 highpc = (CORE_ADDR) 0;
6314 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6316 end_psymtab_common (objfile, pst);
6319 /* Struct used to sort TUs by their abbreviation table offset. */
6321 struct tu_abbrev_offset
6323 struct signatured_type *sig_type;
6324 sect_offset abbrev_offset;
6327 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6330 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6332 const struct tu_abbrev_offset * const *a
6333 = (const struct tu_abbrev_offset * const*) ap;
6334 const struct tu_abbrev_offset * const *b
6335 = (const struct tu_abbrev_offset * const*) bp;
6336 sect_offset aoff = (*a)->abbrev_offset;
6337 sect_offset boff = (*b)->abbrev_offset;
6339 return (aoff > boff) - (aoff < boff);
6342 /* Efficiently read all the type units.
6343 This does the bulk of the work for build_type_psymtabs.
6345 The efficiency is because we sort TUs by the abbrev table they use and
6346 only read each abbrev table once. In one program there are 200K TUs
6347 sharing 8K abbrev tables.
6349 The main purpose of this function is to support building the
6350 dwarf2_per_objfile->type_unit_groups table.
6351 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
6352 can collapse the search space by grouping them by stmt_list.
6353 The savings can be significant, in the same program from above the 200K TUs
6354 share 8K stmt_list tables.
6356 FUNC is expected to call get_type_unit_group, which will create the
6357 struct type_unit_group if necessary and add it to
6358 dwarf2_per_objfile->type_unit_groups. */
6361 build_type_psymtabs_1 (void)
6363 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6364 struct cleanup *cleanups;
6365 struct abbrev_table *abbrev_table;
6366 sect_offset abbrev_offset;
6367 struct tu_abbrev_offset *sorted_by_abbrev;
6370 /* It's up to the caller to not call us multiple times. */
6371 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
6373 if (dwarf2_per_objfile->n_type_units == 0)
6376 /* TUs typically share abbrev tables, and there can be way more TUs than
6377 abbrev tables. Sort by abbrev table to reduce the number of times we
6378 read each abbrev table in.
6379 Alternatives are to punt or to maintain a cache of abbrev tables.
6380 This is simpler and efficient enough for now.
6382 Later we group TUs by their DW_AT_stmt_list value (as this defines the
6383 symtab to use). Typically TUs with the same abbrev offset have the same
6384 stmt_list value too so in practice this should work well.
6386 The basic algorithm here is:
6388 sort TUs by abbrev table
6389 for each TU with same abbrev table:
6390 read abbrev table if first user
6391 read TU top level DIE
6392 [IWBN if DWO skeletons had DW_AT_stmt_list]
6395 if (dwarf_read_debug)
6396 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
6398 /* Sort in a separate table to maintain the order of all_type_units
6399 for .gdb_index: TU indices directly index all_type_units. */
6400 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
6401 dwarf2_per_objfile->n_type_units);
6402 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6404 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
6406 sorted_by_abbrev[i].sig_type = sig_type;
6407 sorted_by_abbrev[i].abbrev_offset =
6408 read_abbrev_offset (sig_type->per_cu.section,
6409 sig_type->per_cu.sect_off);
6411 cleanups = make_cleanup (xfree, sorted_by_abbrev);
6412 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
6413 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
6415 abbrev_offset = (sect_offset) ~(unsigned) 0;
6416 abbrev_table = NULL;
6417 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
6419 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6421 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
6423 /* Switch to the next abbrev table if necessary. */
6424 if (abbrev_table == NULL
6425 || tu->abbrev_offset != abbrev_offset)
6427 if (abbrev_table != NULL)
6429 abbrev_table_free (abbrev_table);
6430 /* Reset to NULL in case abbrev_table_read_table throws
6431 an error: abbrev_table_free_cleanup will get called. */
6432 abbrev_table = NULL;
6434 abbrev_offset = tu->abbrev_offset;
6436 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
6438 ++tu_stats->nr_uniq_abbrev_tables;
6441 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
6442 build_type_psymtabs_reader, NULL);
6445 do_cleanups (cleanups);
6448 /* Print collected type unit statistics. */
6451 print_tu_stats (void)
6453 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6455 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
6456 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
6457 dwarf2_per_objfile->n_type_units);
6458 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
6459 tu_stats->nr_uniq_abbrev_tables);
6460 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
6461 tu_stats->nr_symtabs);
6462 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
6463 tu_stats->nr_symtab_sharers);
6464 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
6465 tu_stats->nr_stmt_less_type_units);
6466 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
6467 tu_stats->nr_all_type_units_reallocs);
6470 /* Traversal function for build_type_psymtabs. */
6473 build_type_psymtab_dependencies (void **slot, void *info)
6475 struct objfile *objfile = dwarf2_per_objfile->objfile;
6476 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6477 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6478 struct partial_symtab *pst = per_cu->v.psymtab;
6479 int len = VEC_length (sig_type_ptr, tu_group->tus);
6480 struct signatured_type *iter;
6483 gdb_assert (len > 0);
6484 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6486 pst->number_of_dependencies = len;
6488 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6490 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6493 gdb_assert (iter->per_cu.is_debug_types);
6494 pst->dependencies[i] = iter->per_cu.v.psymtab;
6495 iter->type_unit_group = tu_group;
6498 VEC_free (sig_type_ptr, tu_group->tus);
6503 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6504 Build partial symbol tables for the .debug_types comp-units. */
6507 build_type_psymtabs (struct objfile *objfile)
6509 if (! create_all_type_units (objfile))
6512 build_type_psymtabs_1 ();
6515 /* Traversal function for process_skeletonless_type_unit.
6516 Read a TU in a DWO file and build partial symbols for it. */
6519 process_skeletonless_type_unit (void **slot, void *info)
6521 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
6522 struct objfile *objfile = (struct objfile *) info;
6523 struct signatured_type find_entry, *entry;
6525 /* If this TU doesn't exist in the global table, add it and read it in. */
6527 if (dwarf2_per_objfile->signatured_types == NULL)
6529 dwarf2_per_objfile->signatured_types
6530 = allocate_signatured_type_table (objfile);
6533 find_entry.signature = dwo_unit->signature;
6534 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
6536 /* If we've already seen this type there's nothing to do. What's happening
6537 is we're doing our own version of comdat-folding here. */
6541 /* This does the job that create_all_type_units would have done for
6543 entry = add_type_unit (dwo_unit->signature, slot);
6544 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
6547 /* This does the job that build_type_psymtabs_1 would have done. */
6548 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
6549 build_type_psymtabs_reader, NULL);
6554 /* Traversal function for process_skeletonless_type_units. */
6557 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
6559 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
6561 if (dwo_file->tus != NULL)
6563 htab_traverse_noresize (dwo_file->tus,
6564 process_skeletonless_type_unit, info);
6570 /* Scan all TUs of DWO files, verifying we've processed them.
6571 This is needed in case a TU was emitted without its skeleton.
6572 Note: This can't be done until we know what all the DWO files are. */
6575 process_skeletonless_type_units (struct objfile *objfile)
6577 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
6578 if (get_dwp_file () == NULL
6579 && dwarf2_per_objfile->dwo_files != NULL)
6581 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
6582 process_dwo_file_for_skeletonless_type_units,
6587 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6590 psymtabs_addrmap_cleanup (void *o)
6592 struct objfile *objfile = (struct objfile *) o;
6594 objfile->psymtabs_addrmap = NULL;
6597 /* Compute the 'user' field for each psymtab in OBJFILE. */
6600 set_partial_user (struct objfile *objfile)
6604 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6606 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6607 struct partial_symtab *pst = per_cu->v.psymtab;
6613 for (j = 0; j < pst->number_of_dependencies; ++j)
6615 /* Set the 'user' field only if it is not already set. */
6616 if (pst->dependencies[j]->user == NULL)
6617 pst->dependencies[j]->user = pst;
6622 /* Build the partial symbol table by doing a quick pass through the
6623 .debug_info and .debug_abbrev sections. */
6626 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6628 struct cleanup *back_to, *addrmap_cleanup;
6629 struct obstack temp_obstack;
6632 if (dwarf_read_debug)
6634 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6635 objfile_name (objfile));
6638 dwarf2_per_objfile->reading_partial_symbols = 1;
6640 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6642 /* Any cached compilation units will be linked by the per-objfile
6643 read_in_chain. Make sure to free them when we're done. */
6644 back_to = make_cleanup (free_cached_comp_units, NULL);
6646 build_type_psymtabs (objfile);
6648 create_all_comp_units (objfile);
6650 /* Create a temporary address map on a temporary obstack. We later
6651 copy this to the final obstack. */
6652 obstack_init (&temp_obstack);
6653 make_cleanup_obstack_free (&temp_obstack);
6654 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6655 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6657 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6659 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6661 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6664 /* This has to wait until we read the CUs, we need the list of DWOs. */
6665 process_skeletonless_type_units (objfile);
6667 /* Now that all TUs have been processed we can fill in the dependencies. */
6668 if (dwarf2_per_objfile->type_unit_groups != NULL)
6670 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6671 build_type_psymtab_dependencies, NULL);
6674 if (dwarf_read_debug)
6677 set_partial_user (objfile);
6679 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6680 &objfile->objfile_obstack);
6681 discard_cleanups (addrmap_cleanup);
6683 do_cleanups (back_to);
6685 if (dwarf_read_debug)
6686 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6687 objfile_name (objfile));
6690 /* die_reader_func for load_partial_comp_unit. */
6693 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6694 const gdb_byte *info_ptr,
6695 struct die_info *comp_unit_die,
6699 struct dwarf2_cu *cu = reader->cu;
6701 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6703 /* Check if comp unit has_children.
6704 If so, read the rest of the partial symbols from this comp unit.
6705 If not, there's no more debug_info for this comp unit. */
6707 load_partial_dies (reader, info_ptr, 0);
6710 /* Load the partial DIEs for a secondary CU into memory.
6711 This is also used when rereading a primary CU with load_all_dies. */
6714 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6716 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6717 load_partial_comp_unit_reader, NULL);
6721 read_comp_units_from_section (struct objfile *objfile,
6722 struct dwarf2_section_info *section,
6723 unsigned int is_dwz,
6726 struct dwarf2_per_cu_data ***all_comp_units)
6728 const gdb_byte *info_ptr;
6729 bfd *abfd = get_section_bfd_owner (section);
6731 if (dwarf_read_debug)
6732 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6733 get_section_name (section),
6734 get_section_file_name (section));
6736 dwarf2_read_section (objfile, section);
6738 info_ptr = section->buffer;
6740 while (info_ptr < section->buffer + section->size)
6742 unsigned int length, initial_length_size;
6743 struct dwarf2_per_cu_data *this_cu;
6745 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
6747 /* Read just enough information to find out where the next
6748 compilation unit is. */
6749 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6751 /* Save the compilation unit for later lookup. */
6752 this_cu = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_cu_data);
6753 memset (this_cu, 0, sizeof (*this_cu));
6754 this_cu->sect_off = sect_off;
6755 this_cu->length = length + initial_length_size;
6756 this_cu->is_dwz = is_dwz;
6757 this_cu->objfile = objfile;
6758 this_cu->section = section;
6760 if (*n_comp_units == *n_allocated)
6763 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
6764 *all_comp_units, *n_allocated);
6766 (*all_comp_units)[*n_comp_units] = this_cu;
6769 info_ptr = info_ptr + this_cu->length;
6773 /* Create a list of all compilation units in OBJFILE.
6774 This is only done for -readnow and building partial symtabs. */
6777 create_all_comp_units (struct objfile *objfile)
6781 struct dwarf2_per_cu_data **all_comp_units;
6782 struct dwz_file *dwz;
6786 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
6788 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6789 &n_allocated, &n_comp_units, &all_comp_units);
6791 dwz = dwarf2_get_dwz_file ();
6793 read_comp_units_from_section (objfile, &dwz->info, 1,
6794 &n_allocated, &n_comp_units,
6797 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
6798 struct dwarf2_per_cu_data *,
6800 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6801 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6802 xfree (all_comp_units);
6803 dwarf2_per_objfile->n_comp_units = n_comp_units;
6806 /* Process all loaded DIEs for compilation unit CU, starting at
6807 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
6808 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6809 DW_AT_ranges). See the comments of add_partial_subprogram on how
6810 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
6813 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6814 CORE_ADDR *highpc, int set_addrmap,
6815 struct dwarf2_cu *cu)
6817 struct partial_die_info *pdi;
6819 /* Now, march along the PDI's, descending into ones which have
6820 interesting children but skipping the children of the other ones,
6821 until we reach the end of the compilation unit. */
6827 fixup_partial_die (pdi, cu);
6829 /* Anonymous namespaces or modules have no name but have interesting
6830 children, so we need to look at them. Ditto for anonymous
6833 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6834 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6835 || pdi->tag == DW_TAG_imported_unit)
6839 case DW_TAG_subprogram:
6840 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
6842 case DW_TAG_constant:
6843 case DW_TAG_variable:
6844 case DW_TAG_typedef:
6845 case DW_TAG_union_type:
6846 if (!pdi->is_declaration)
6848 add_partial_symbol (pdi, cu);
6851 case DW_TAG_class_type:
6852 case DW_TAG_interface_type:
6853 case DW_TAG_structure_type:
6854 if (!pdi->is_declaration)
6856 add_partial_symbol (pdi, cu);
6858 if (cu->language == language_rust && pdi->has_children)
6859 scan_partial_symbols (pdi->die_child, lowpc, highpc,
6862 case DW_TAG_enumeration_type:
6863 if (!pdi->is_declaration)
6864 add_partial_enumeration (pdi, cu);
6866 case DW_TAG_base_type:
6867 case DW_TAG_subrange_type:
6868 /* File scope base type definitions are added to the partial
6870 add_partial_symbol (pdi, cu);
6872 case DW_TAG_namespace:
6873 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
6876 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
6878 case DW_TAG_imported_unit:
6880 struct dwarf2_per_cu_data *per_cu;
6882 /* For now we don't handle imported units in type units. */
6883 if (cu->per_cu->is_debug_types)
6885 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6886 " supported in type units [in module %s]"),
6887 objfile_name (cu->objfile));
6890 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
6894 /* Go read the partial unit, if needed. */
6895 if (per_cu->v.psymtab == NULL)
6896 process_psymtab_comp_unit (per_cu, 1, cu->language);
6898 VEC_safe_push (dwarf2_per_cu_ptr,
6899 cu->per_cu->imported_symtabs, per_cu);
6902 case DW_TAG_imported_declaration:
6903 add_partial_symbol (pdi, cu);
6910 /* If the die has a sibling, skip to the sibling. */
6912 pdi = pdi->die_sibling;
6916 /* Functions used to compute the fully scoped name of a partial DIE.
6918 Normally, this is simple. For C++, the parent DIE's fully scoped
6919 name is concatenated with "::" and the partial DIE's name.
6920 Enumerators are an exception; they use the scope of their parent
6921 enumeration type, i.e. the name of the enumeration type is not
6922 prepended to the enumerator.
6924 There are two complexities. One is DW_AT_specification; in this
6925 case "parent" means the parent of the target of the specification,
6926 instead of the direct parent of the DIE. The other is compilers
6927 which do not emit DW_TAG_namespace; in this case we try to guess
6928 the fully qualified name of structure types from their members'
6929 linkage names. This must be done using the DIE's children rather
6930 than the children of any DW_AT_specification target. We only need
6931 to do this for structures at the top level, i.e. if the target of
6932 any DW_AT_specification (if any; otherwise the DIE itself) does not
6935 /* Compute the scope prefix associated with PDI's parent, in
6936 compilation unit CU. The result will be allocated on CU's
6937 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6938 field. NULL is returned if no prefix is necessary. */
6940 partial_die_parent_scope (struct partial_die_info *pdi,
6941 struct dwarf2_cu *cu)
6943 const char *grandparent_scope;
6944 struct partial_die_info *parent, *real_pdi;
6946 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6947 then this means the parent of the specification DIE. */
6950 while (real_pdi->has_specification)
6951 real_pdi = find_partial_die (real_pdi->spec_offset,
6952 real_pdi->spec_is_dwz, cu);
6954 parent = real_pdi->die_parent;
6958 if (parent->scope_set)
6959 return parent->scope;
6961 fixup_partial_die (parent, cu);
6963 grandparent_scope = partial_die_parent_scope (parent, cu);
6965 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6966 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6967 Work around this problem here. */
6968 if (cu->language == language_cplus
6969 && parent->tag == DW_TAG_namespace
6970 && strcmp (parent->name, "::") == 0
6971 && grandparent_scope == NULL)
6973 parent->scope = NULL;
6974 parent->scope_set = 1;
6978 if (pdi->tag == DW_TAG_enumerator)
6979 /* Enumerators should not get the name of the enumeration as a prefix. */
6980 parent->scope = grandparent_scope;
6981 else if (parent->tag == DW_TAG_namespace
6982 || parent->tag == DW_TAG_module
6983 || parent->tag == DW_TAG_structure_type
6984 || parent->tag == DW_TAG_class_type
6985 || parent->tag == DW_TAG_interface_type
6986 || parent->tag == DW_TAG_union_type
6987 || parent->tag == DW_TAG_enumeration_type)
6989 if (grandparent_scope == NULL)
6990 parent->scope = parent->name;
6992 parent->scope = typename_concat (&cu->comp_unit_obstack,
6994 parent->name, 0, cu);
6998 /* FIXME drow/2004-04-01: What should we be doing with
6999 function-local names? For partial symbols, we should probably be
7001 complaint (&symfile_complaints,
7002 _("unhandled containing DIE tag %d for DIE at %d"),
7003 parent->tag, to_underlying (pdi->sect_off));
7004 parent->scope = grandparent_scope;
7007 parent->scope_set = 1;
7008 return parent->scope;
7011 /* Return the fully scoped name associated with PDI, from compilation unit
7012 CU. The result will be allocated with malloc. */
7015 partial_die_full_name (struct partial_die_info *pdi,
7016 struct dwarf2_cu *cu)
7018 const char *parent_scope;
7020 /* If this is a template instantiation, we can not work out the
7021 template arguments from partial DIEs. So, unfortunately, we have
7022 to go through the full DIEs. At least any work we do building
7023 types here will be reused if full symbols are loaded later. */
7024 if (pdi->has_template_arguments)
7026 fixup_partial_die (pdi, cu);
7028 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7030 struct die_info *die;
7031 struct attribute attr;
7032 struct dwarf2_cu *ref_cu = cu;
7034 /* DW_FORM_ref_addr is using section offset. */
7035 attr.name = (enum dwarf_attribute) 0;
7036 attr.form = DW_FORM_ref_addr;
7037 attr.u.unsnd = to_underlying (pdi->sect_off);
7038 die = follow_die_ref (NULL, &attr, &ref_cu);
7040 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7044 parent_scope = partial_die_parent_scope (pdi, cu);
7045 if (parent_scope == NULL)
7048 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7052 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7054 struct objfile *objfile = cu->objfile;
7055 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7057 const char *actual_name = NULL;
7059 char *built_actual_name;
7061 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7063 built_actual_name = partial_die_full_name (pdi, cu);
7064 if (built_actual_name != NULL)
7065 actual_name = built_actual_name;
7067 if (actual_name == NULL)
7068 actual_name = pdi->name;
7072 case DW_TAG_subprogram:
7073 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
7074 if (pdi->is_external || cu->language == language_ada)
7076 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
7077 of the global scope. But in Ada, we want to be able to access
7078 nested procedures globally. So all Ada subprograms are stored
7079 in the global scope. */
7080 add_psymbol_to_list (actual_name, strlen (actual_name),
7081 built_actual_name != NULL,
7082 VAR_DOMAIN, LOC_BLOCK,
7083 &objfile->global_psymbols,
7084 addr, cu->language, objfile);
7088 add_psymbol_to_list (actual_name, strlen (actual_name),
7089 built_actual_name != NULL,
7090 VAR_DOMAIN, LOC_BLOCK,
7091 &objfile->static_psymbols,
7092 addr, cu->language, objfile);
7095 if (pdi->main_subprogram && actual_name != NULL)
7096 set_objfile_main_name (objfile, actual_name, cu->language);
7098 case DW_TAG_constant:
7100 struct psymbol_allocation_list *list;
7102 if (pdi->is_external)
7103 list = &objfile->global_psymbols;
7105 list = &objfile->static_psymbols;
7106 add_psymbol_to_list (actual_name, strlen (actual_name),
7107 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
7108 list, 0, cu->language, objfile);
7111 case DW_TAG_variable:
7113 addr = decode_locdesc (pdi->d.locdesc, cu);
7117 && !dwarf2_per_objfile->has_section_at_zero)
7119 /* A global or static variable may also have been stripped
7120 out by the linker if unused, in which case its address
7121 will be nullified; do not add such variables into partial
7122 symbol table then. */
7124 else if (pdi->is_external)
7127 Don't enter into the minimal symbol tables as there is
7128 a minimal symbol table entry from the ELF symbols already.
7129 Enter into partial symbol table if it has a location
7130 descriptor or a type.
7131 If the location descriptor is missing, new_symbol will create
7132 a LOC_UNRESOLVED symbol, the address of the variable will then
7133 be determined from the minimal symbol table whenever the variable
7135 The address for the partial symbol table entry is not
7136 used by GDB, but it comes in handy for debugging partial symbol
7139 if (pdi->d.locdesc || pdi->has_type)
7140 add_psymbol_to_list (actual_name, strlen (actual_name),
7141 built_actual_name != NULL,
7142 VAR_DOMAIN, LOC_STATIC,
7143 &objfile->global_psymbols,
7145 cu->language, objfile);
7149 int has_loc = pdi->d.locdesc != NULL;
7151 /* Static Variable. Skip symbols whose value we cannot know (those
7152 without location descriptors or constant values). */
7153 if (!has_loc && !pdi->has_const_value)
7155 xfree (built_actual_name);
7159 add_psymbol_to_list (actual_name, strlen (actual_name),
7160 built_actual_name != NULL,
7161 VAR_DOMAIN, LOC_STATIC,
7162 &objfile->static_psymbols,
7163 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7164 cu->language, objfile);
7167 case DW_TAG_typedef:
7168 case DW_TAG_base_type:
7169 case DW_TAG_subrange_type:
7170 add_psymbol_to_list (actual_name, strlen (actual_name),
7171 built_actual_name != NULL,
7172 VAR_DOMAIN, LOC_TYPEDEF,
7173 &objfile->static_psymbols,
7174 0, cu->language, objfile);
7176 case DW_TAG_imported_declaration:
7177 case DW_TAG_namespace:
7178 add_psymbol_to_list (actual_name, strlen (actual_name),
7179 built_actual_name != NULL,
7180 VAR_DOMAIN, LOC_TYPEDEF,
7181 &objfile->global_psymbols,
7182 0, cu->language, objfile);
7185 add_psymbol_to_list (actual_name, strlen (actual_name),
7186 built_actual_name != NULL,
7187 MODULE_DOMAIN, LOC_TYPEDEF,
7188 &objfile->global_psymbols,
7189 0, cu->language, objfile);
7191 case DW_TAG_class_type:
7192 case DW_TAG_interface_type:
7193 case DW_TAG_structure_type:
7194 case DW_TAG_union_type:
7195 case DW_TAG_enumeration_type:
7196 /* Skip external references. The DWARF standard says in the section
7197 about "Structure, Union, and Class Type Entries": "An incomplete
7198 structure, union or class type is represented by a structure,
7199 union or class entry that does not have a byte size attribute
7200 and that has a DW_AT_declaration attribute." */
7201 if (!pdi->has_byte_size && pdi->is_declaration)
7203 xfree (built_actual_name);
7207 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7208 static vs. global. */
7209 add_psymbol_to_list (actual_name, strlen (actual_name),
7210 built_actual_name != NULL,
7211 STRUCT_DOMAIN, LOC_TYPEDEF,
7212 cu->language == language_cplus
7213 ? &objfile->global_psymbols
7214 : &objfile->static_psymbols,
7215 0, cu->language, objfile);
7218 case DW_TAG_enumerator:
7219 add_psymbol_to_list (actual_name, strlen (actual_name),
7220 built_actual_name != NULL,
7221 VAR_DOMAIN, LOC_CONST,
7222 cu->language == language_cplus
7223 ? &objfile->global_psymbols
7224 : &objfile->static_psymbols,
7225 0, cu->language, objfile);
7231 xfree (built_actual_name);
7234 /* Read a partial die corresponding to a namespace; also, add a symbol
7235 corresponding to that namespace to the symbol table. NAMESPACE is
7236 the name of the enclosing namespace. */
7239 add_partial_namespace (struct partial_die_info *pdi,
7240 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7241 int set_addrmap, struct dwarf2_cu *cu)
7243 /* Add a symbol for the namespace. */
7245 add_partial_symbol (pdi, cu);
7247 /* Now scan partial symbols in that namespace. */
7249 if (pdi->has_children)
7250 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7253 /* Read a partial die corresponding to a Fortran module. */
7256 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7257 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7259 /* Add a symbol for the namespace. */
7261 add_partial_symbol (pdi, cu);
7263 /* Now scan partial symbols in that module. */
7265 if (pdi->has_children)
7266 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7269 /* Read a partial die corresponding to a subprogram and create a partial
7270 symbol for that subprogram. When the CU language allows it, this
7271 routine also defines a partial symbol for each nested subprogram
7272 that this subprogram contains. If SET_ADDRMAP is true, record the
7273 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7274 and highest PC values found in PDI.
7276 PDI may also be a lexical block, in which case we simply search
7277 recursively for subprograms defined inside that lexical block.
7278 Again, this is only performed when the CU language allows this
7279 type of definitions. */
7282 add_partial_subprogram (struct partial_die_info *pdi,
7283 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7284 int set_addrmap, struct dwarf2_cu *cu)
7286 if (pdi->tag == DW_TAG_subprogram)
7288 if (pdi->has_pc_info)
7290 if (pdi->lowpc < *lowpc)
7291 *lowpc = pdi->lowpc;
7292 if (pdi->highpc > *highpc)
7293 *highpc = pdi->highpc;
7296 struct objfile *objfile = cu->objfile;
7297 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7302 baseaddr = ANOFFSET (objfile->section_offsets,
7303 SECT_OFF_TEXT (objfile));
7304 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7305 pdi->lowpc + baseaddr);
7306 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7307 pdi->highpc + baseaddr);
7308 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7309 cu->per_cu->v.psymtab);
7313 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7315 if (!pdi->is_declaration)
7316 /* Ignore subprogram DIEs that do not have a name, they are
7317 illegal. Do not emit a complaint at this point, we will
7318 do so when we convert this psymtab into a symtab. */
7320 add_partial_symbol (pdi, cu);
7324 if (! pdi->has_children)
7327 if (cu->language == language_ada)
7329 pdi = pdi->die_child;
7332 fixup_partial_die (pdi, cu);
7333 if (pdi->tag == DW_TAG_subprogram
7334 || pdi->tag == DW_TAG_lexical_block)
7335 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7336 pdi = pdi->die_sibling;
7341 /* Read a partial die corresponding to an enumeration type. */
7344 add_partial_enumeration (struct partial_die_info *enum_pdi,
7345 struct dwarf2_cu *cu)
7347 struct partial_die_info *pdi;
7349 if (enum_pdi->name != NULL)
7350 add_partial_symbol (enum_pdi, cu);
7352 pdi = enum_pdi->die_child;
7355 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7356 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7358 add_partial_symbol (pdi, cu);
7359 pdi = pdi->die_sibling;
7363 /* Return the initial uleb128 in the die at INFO_PTR. */
7366 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7368 unsigned int bytes_read;
7370 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7373 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7374 Return the corresponding abbrev, or NULL if the number is zero (indicating
7375 an empty DIE). In either case *BYTES_READ will be set to the length of
7376 the initial number. */
7378 static struct abbrev_info *
7379 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7380 struct dwarf2_cu *cu)
7382 bfd *abfd = cu->objfile->obfd;
7383 unsigned int abbrev_number;
7384 struct abbrev_info *abbrev;
7386 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7388 if (abbrev_number == 0)
7391 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7394 error (_("Dwarf Error: Could not find abbrev number %d in %s"
7395 " at offset 0x%x [in module %s]"),
7396 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
7397 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
7403 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7404 Returns a pointer to the end of a series of DIEs, terminated by an empty
7405 DIE. Any children of the skipped DIEs will also be skipped. */
7407 static const gdb_byte *
7408 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7410 struct dwarf2_cu *cu = reader->cu;
7411 struct abbrev_info *abbrev;
7412 unsigned int bytes_read;
7416 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7418 return info_ptr + bytes_read;
7420 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7424 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7425 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7426 abbrev corresponding to that skipped uleb128 should be passed in
7427 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7430 static const gdb_byte *
7431 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7432 struct abbrev_info *abbrev)
7434 unsigned int bytes_read;
7435 struct attribute attr;
7436 bfd *abfd = reader->abfd;
7437 struct dwarf2_cu *cu = reader->cu;
7438 const gdb_byte *buffer = reader->buffer;
7439 const gdb_byte *buffer_end = reader->buffer_end;
7440 unsigned int form, i;
7442 for (i = 0; i < abbrev->num_attrs; i++)
7444 /* The only abbrev we care about is DW_AT_sibling. */
7445 if (abbrev->attrs[i].name == DW_AT_sibling)
7447 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7448 if (attr.form == DW_FORM_ref_addr)
7449 complaint (&symfile_complaints,
7450 _("ignoring absolute DW_AT_sibling"));
7453 sect_offset off = dwarf2_get_ref_die_offset (&attr);
7454 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
7456 if (sibling_ptr < info_ptr)
7457 complaint (&symfile_complaints,
7458 _("DW_AT_sibling points backwards"));
7459 else if (sibling_ptr > reader->buffer_end)
7460 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7466 /* If it isn't DW_AT_sibling, skip this attribute. */
7467 form = abbrev->attrs[i].form;
7471 case DW_FORM_ref_addr:
7472 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7473 and later it is offset sized. */
7474 if (cu->header.version == 2)
7475 info_ptr += cu->header.addr_size;
7477 info_ptr += cu->header.offset_size;
7479 case DW_FORM_GNU_ref_alt:
7480 info_ptr += cu->header.offset_size;
7483 info_ptr += cu->header.addr_size;
7490 case DW_FORM_flag_present:
7491 case DW_FORM_implicit_const:
7503 case DW_FORM_ref_sig8:
7506 case DW_FORM_data16:
7509 case DW_FORM_string:
7510 read_direct_string (abfd, info_ptr, &bytes_read);
7511 info_ptr += bytes_read;
7513 case DW_FORM_sec_offset:
7515 case DW_FORM_GNU_strp_alt:
7516 info_ptr += cu->header.offset_size;
7518 case DW_FORM_exprloc:
7520 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7521 info_ptr += bytes_read;
7523 case DW_FORM_block1:
7524 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7526 case DW_FORM_block2:
7527 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7529 case DW_FORM_block4:
7530 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7534 case DW_FORM_ref_udata:
7535 case DW_FORM_GNU_addr_index:
7536 case DW_FORM_GNU_str_index:
7537 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7539 case DW_FORM_indirect:
7540 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7541 info_ptr += bytes_read;
7542 /* We need to continue parsing from here, so just go back to
7544 goto skip_attribute;
7547 error (_("Dwarf Error: Cannot handle %s "
7548 "in DWARF reader [in module %s]"),
7549 dwarf_form_name (form),
7550 bfd_get_filename (abfd));
7554 if (abbrev->has_children)
7555 return skip_children (reader, info_ptr);
7560 /* Locate ORIG_PDI's sibling.
7561 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7563 static const gdb_byte *
7564 locate_pdi_sibling (const struct die_reader_specs *reader,
7565 struct partial_die_info *orig_pdi,
7566 const gdb_byte *info_ptr)
7568 /* Do we know the sibling already? */
7570 if (orig_pdi->sibling)
7571 return orig_pdi->sibling;
7573 /* Are there any children to deal with? */
7575 if (!orig_pdi->has_children)
7578 /* Skip the children the long way. */
7580 return skip_children (reader, info_ptr);
7583 /* Expand this partial symbol table into a full symbol table. SELF is
7587 dwarf2_read_symtab (struct partial_symtab *self,
7588 struct objfile *objfile)
7592 warning (_("bug: psymtab for %s is already read in."),
7599 printf_filtered (_("Reading in symbols for %s..."),
7601 gdb_flush (gdb_stdout);
7604 /* Restore our global data. */
7606 = (struct dwarf2_per_objfile *) objfile_data (objfile,
7607 dwarf2_objfile_data_key);
7609 /* If this psymtab is constructed from a debug-only objfile, the
7610 has_section_at_zero flag will not necessarily be correct. We
7611 can get the correct value for this flag by looking at the data
7612 associated with the (presumably stripped) associated objfile. */
7613 if (objfile->separate_debug_objfile_backlink)
7615 struct dwarf2_per_objfile *dpo_backlink
7616 = ((struct dwarf2_per_objfile *)
7617 objfile_data (objfile->separate_debug_objfile_backlink,
7618 dwarf2_objfile_data_key));
7620 dwarf2_per_objfile->has_section_at_zero
7621 = dpo_backlink->has_section_at_zero;
7624 dwarf2_per_objfile->reading_partial_symbols = 0;
7626 psymtab_to_symtab_1 (self);
7628 /* Finish up the debug error message. */
7630 printf_filtered (_("done.\n"));
7633 process_cu_includes ();
7636 /* Reading in full CUs. */
7638 /* Add PER_CU to the queue. */
7641 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7642 enum language pretend_language)
7644 struct dwarf2_queue_item *item;
7647 item = XNEW (struct dwarf2_queue_item);
7648 item->per_cu = per_cu;
7649 item->pretend_language = pretend_language;
7652 if (dwarf2_queue == NULL)
7653 dwarf2_queue = item;
7655 dwarf2_queue_tail->next = item;
7657 dwarf2_queue_tail = item;
7660 /* If PER_CU is not yet queued, add it to the queue.
7661 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7663 The result is non-zero if PER_CU was queued, otherwise the result is zero
7664 meaning either PER_CU is already queued or it is already loaded.
7666 N.B. There is an invariant here that if a CU is queued then it is loaded.
7667 The caller is required to load PER_CU if we return non-zero. */
7670 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7671 struct dwarf2_per_cu_data *per_cu,
7672 enum language pretend_language)
7674 /* We may arrive here during partial symbol reading, if we need full
7675 DIEs to process an unusual case (e.g. template arguments). Do
7676 not queue PER_CU, just tell our caller to load its DIEs. */
7677 if (dwarf2_per_objfile->reading_partial_symbols)
7679 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7684 /* Mark the dependence relation so that we don't flush PER_CU
7686 if (dependent_cu != NULL)
7687 dwarf2_add_dependence (dependent_cu, per_cu);
7689 /* If it's already on the queue, we have nothing to do. */
7693 /* If the compilation unit is already loaded, just mark it as
7695 if (per_cu->cu != NULL)
7697 per_cu->cu->last_used = 0;
7701 /* Add it to the queue. */
7702 queue_comp_unit (per_cu, pretend_language);
7707 /* Process the queue. */
7710 process_queue (void)
7712 struct dwarf2_queue_item *item, *next_item;
7714 if (dwarf_read_debug)
7716 fprintf_unfiltered (gdb_stdlog,
7717 "Expanding one or more symtabs of objfile %s ...\n",
7718 objfile_name (dwarf2_per_objfile->objfile));
7721 /* The queue starts out with one item, but following a DIE reference
7722 may load a new CU, adding it to the end of the queue. */
7723 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7725 if ((dwarf2_per_objfile->using_index
7726 ? !item->per_cu->v.quick->compunit_symtab
7727 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7728 /* Skip dummy CUs. */
7729 && item->per_cu->cu != NULL)
7731 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7732 unsigned int debug_print_threshold;
7735 if (per_cu->is_debug_types)
7737 struct signatured_type *sig_type =
7738 (struct signatured_type *) per_cu;
7740 sprintf (buf, "TU %s at offset 0x%x",
7741 hex_string (sig_type->signature),
7742 to_underlying (per_cu->sect_off));
7743 /* There can be 100s of TUs.
7744 Only print them in verbose mode. */
7745 debug_print_threshold = 2;
7749 sprintf (buf, "CU at offset 0x%x",
7750 to_underlying (per_cu->sect_off));
7751 debug_print_threshold = 1;
7754 if (dwarf_read_debug >= debug_print_threshold)
7755 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7757 if (per_cu->is_debug_types)
7758 process_full_type_unit (per_cu, item->pretend_language);
7760 process_full_comp_unit (per_cu, item->pretend_language);
7762 if (dwarf_read_debug >= debug_print_threshold)
7763 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7766 item->per_cu->queued = 0;
7767 next_item = item->next;
7771 dwarf2_queue_tail = NULL;
7773 if (dwarf_read_debug)
7775 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7776 objfile_name (dwarf2_per_objfile->objfile));
7780 /* Free all allocated queue entries. This function only releases anything if
7781 an error was thrown; if the queue was processed then it would have been
7782 freed as we went along. */
7785 dwarf2_release_queue (void *dummy)
7787 struct dwarf2_queue_item *item, *last;
7789 item = dwarf2_queue;
7792 /* Anything still marked queued is likely to be in an
7793 inconsistent state, so discard it. */
7794 if (item->per_cu->queued)
7796 if (item->per_cu->cu != NULL)
7797 free_one_cached_comp_unit (item->per_cu);
7798 item->per_cu->queued = 0;
7806 dwarf2_queue = dwarf2_queue_tail = NULL;
7809 /* Read in full symbols for PST, and anything it depends on. */
7812 psymtab_to_symtab_1 (struct partial_symtab *pst)
7814 struct dwarf2_per_cu_data *per_cu;
7820 for (i = 0; i < pst->number_of_dependencies; i++)
7821 if (!pst->dependencies[i]->readin
7822 && pst->dependencies[i]->user == NULL)
7824 /* Inform about additional files that need to be read in. */
7827 /* FIXME: i18n: Need to make this a single string. */
7828 fputs_filtered (" ", gdb_stdout);
7830 fputs_filtered ("and ", gdb_stdout);
7832 printf_filtered ("%s...", pst->dependencies[i]->filename);
7833 wrap_here (""); /* Flush output. */
7834 gdb_flush (gdb_stdout);
7836 psymtab_to_symtab_1 (pst->dependencies[i]);
7839 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
7843 /* It's an include file, no symbols to read for it.
7844 Everything is in the parent symtab. */
7849 dw2_do_instantiate_symtab (per_cu);
7852 /* Trivial hash function for die_info: the hash value of a DIE
7853 is its offset in .debug_info for this objfile. */
7856 die_hash (const void *item)
7858 const struct die_info *die = (const struct die_info *) item;
7860 return to_underlying (die->sect_off);
7863 /* Trivial comparison function for die_info structures: two DIEs
7864 are equal if they have the same offset. */
7867 die_eq (const void *item_lhs, const void *item_rhs)
7869 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
7870 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
7872 return die_lhs->sect_off == die_rhs->sect_off;
7875 /* die_reader_func for load_full_comp_unit.
7876 This is identical to read_signatured_type_reader,
7877 but is kept separate for now. */
7880 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7881 const gdb_byte *info_ptr,
7882 struct die_info *comp_unit_die,
7886 struct dwarf2_cu *cu = reader->cu;
7887 enum language *language_ptr = (enum language *) data;
7889 gdb_assert (cu->die_hash == NULL);
7891 htab_create_alloc_ex (cu->header.length / 12,
7895 &cu->comp_unit_obstack,
7896 hashtab_obstack_allocate,
7897 dummy_obstack_deallocate);
7900 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7901 &info_ptr, comp_unit_die);
7902 cu->dies = comp_unit_die;
7903 /* comp_unit_die is not stored in die_hash, no need. */
7905 /* We try not to read any attributes in this function, because not
7906 all CUs needed for references have been loaded yet, and symbol
7907 table processing isn't initialized. But we have to set the CU language,
7908 or we won't be able to build types correctly.
7909 Similarly, if we do not read the producer, we can not apply
7910 producer-specific interpretation. */
7911 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7914 /* Load the DIEs associated with PER_CU into memory. */
7917 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7918 enum language pretend_language)
7920 gdb_assert (! this_cu->is_debug_types);
7922 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7923 load_full_comp_unit_reader, &pretend_language);
7926 /* Add a DIE to the delayed physname list. */
7929 add_to_method_list (struct type *type, int fnfield_index, int index,
7930 const char *name, struct die_info *die,
7931 struct dwarf2_cu *cu)
7933 struct delayed_method_info mi;
7935 mi.fnfield_index = fnfield_index;
7939 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7942 /* A cleanup for freeing the delayed method list. */
7945 free_delayed_list (void *ptr)
7947 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7948 if (cu->method_list != NULL)
7950 VEC_free (delayed_method_info, cu->method_list);
7951 cu->method_list = NULL;
7955 /* Compute the physnames of any methods on the CU's method list.
7957 The computation of method physnames is delayed in order to avoid the
7958 (bad) condition that one of the method's formal parameters is of an as yet
7962 compute_delayed_physnames (struct dwarf2_cu *cu)
7965 struct delayed_method_info *mi;
7966 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7968 const char *physname;
7969 struct fn_fieldlist *fn_flp
7970 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7971 physname = dwarf2_physname (mi->name, mi->die, cu);
7972 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
7973 = physname ? physname : "";
7977 /* Go objects should be embedded in a DW_TAG_module DIE,
7978 and it's not clear if/how imported objects will appear.
7979 To keep Go support simple until that's worked out,
7980 go back through what we've read and create something usable.
7981 We could do this while processing each DIE, and feels kinda cleaner,
7982 but that way is more invasive.
7983 This is to, for example, allow the user to type "p var" or "b main"
7984 without having to specify the package name, and allow lookups
7985 of module.object to work in contexts that use the expression
7989 fixup_go_packaging (struct dwarf2_cu *cu)
7991 char *package_name = NULL;
7992 struct pending *list;
7995 for (list = global_symbols; list != NULL; list = list->next)
7997 for (i = 0; i < list->nsyms; ++i)
7999 struct symbol *sym = list->symbol[i];
8001 if (SYMBOL_LANGUAGE (sym) == language_go
8002 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8004 char *this_package_name = go_symbol_package_name (sym);
8006 if (this_package_name == NULL)
8008 if (package_name == NULL)
8009 package_name = this_package_name;
8012 if (strcmp (package_name, this_package_name) != 0)
8013 complaint (&symfile_complaints,
8014 _("Symtab %s has objects from two different Go packages: %s and %s"),
8015 (symbol_symtab (sym) != NULL
8016 ? symtab_to_filename_for_display
8017 (symbol_symtab (sym))
8018 : objfile_name (cu->objfile)),
8019 this_package_name, package_name);
8020 xfree (this_package_name);
8026 if (package_name != NULL)
8028 struct objfile *objfile = cu->objfile;
8029 const char *saved_package_name
8030 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
8032 strlen (package_name));
8033 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
8034 saved_package_name);
8037 TYPE_TAG_NAME (type) = TYPE_NAME (type);
8039 sym = allocate_symbol (objfile);
8040 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
8041 SYMBOL_SET_NAMES (sym, saved_package_name,
8042 strlen (saved_package_name), 0, objfile);
8043 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
8044 e.g., "main" finds the "main" module and not C's main(). */
8045 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
8046 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
8047 SYMBOL_TYPE (sym) = type;
8049 add_symbol_to_list (sym, &global_symbols);
8051 xfree (package_name);
8055 /* Return the symtab for PER_CU. This works properly regardless of
8056 whether we're using the index or psymtabs. */
8058 static struct compunit_symtab *
8059 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
8061 return (dwarf2_per_objfile->using_index
8062 ? per_cu->v.quick->compunit_symtab
8063 : per_cu->v.psymtab->compunit_symtab);
8066 /* A helper function for computing the list of all symbol tables
8067 included by PER_CU. */
8070 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
8071 htab_t all_children, htab_t all_type_symtabs,
8072 struct dwarf2_per_cu_data *per_cu,
8073 struct compunit_symtab *immediate_parent)
8077 struct compunit_symtab *cust;
8078 struct dwarf2_per_cu_data *iter;
8080 slot = htab_find_slot (all_children, per_cu, INSERT);
8083 /* This inclusion and its children have been processed. */
8088 /* Only add a CU if it has a symbol table. */
8089 cust = get_compunit_symtab (per_cu);
8092 /* If this is a type unit only add its symbol table if we haven't
8093 seen it yet (type unit per_cu's can share symtabs). */
8094 if (per_cu->is_debug_types)
8096 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
8100 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8101 if (cust->user == NULL)
8102 cust->user = immediate_parent;
8107 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8108 if (cust->user == NULL)
8109 cust->user = immediate_parent;
8114 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
8117 recursively_compute_inclusions (result, all_children,
8118 all_type_symtabs, iter, cust);
8122 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
8126 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
8128 gdb_assert (! per_cu->is_debug_types);
8130 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
8133 struct dwarf2_per_cu_data *per_cu_iter;
8134 struct compunit_symtab *compunit_symtab_iter;
8135 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
8136 htab_t all_children, all_type_symtabs;
8137 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
8139 /* If we don't have a symtab, we can just skip this case. */
8143 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8144 NULL, xcalloc, xfree);
8145 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8146 NULL, xcalloc, xfree);
8149 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
8153 recursively_compute_inclusions (&result_symtabs, all_children,
8154 all_type_symtabs, per_cu_iter,
8158 /* Now we have a transitive closure of all the included symtabs. */
8159 len = VEC_length (compunit_symtab_ptr, result_symtabs);
8161 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
8162 struct compunit_symtab *, len + 1);
8164 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
8165 compunit_symtab_iter);
8167 cust->includes[ix] = compunit_symtab_iter;
8168 cust->includes[len] = NULL;
8170 VEC_free (compunit_symtab_ptr, result_symtabs);
8171 htab_delete (all_children);
8172 htab_delete (all_type_symtabs);
8176 /* Compute the 'includes' field for the symtabs of all the CUs we just
8180 process_cu_includes (void)
8183 struct dwarf2_per_cu_data *iter;
8186 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8190 if (! iter->is_debug_types)
8191 compute_compunit_symtab_includes (iter);
8194 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8197 /* Generate full symbol information for PER_CU, whose DIEs have
8198 already been loaded into memory. */
8201 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8202 enum language pretend_language)
8204 struct dwarf2_cu *cu = per_cu->cu;
8205 struct objfile *objfile = per_cu->objfile;
8206 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8207 CORE_ADDR lowpc, highpc;
8208 struct compunit_symtab *cust;
8209 struct cleanup *back_to, *delayed_list_cleanup;
8211 struct block *static_block;
8214 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8217 back_to = make_cleanup (really_free_pendings, NULL);
8218 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8220 cu->list_in_scope = &file_symbols;
8222 cu->language = pretend_language;
8223 cu->language_defn = language_def (cu->language);
8225 /* Do line number decoding in read_file_scope () */
8226 process_die (cu->dies, cu);
8228 /* For now fudge the Go package. */
8229 if (cu->language == language_go)
8230 fixup_go_packaging (cu);
8232 /* Now that we have processed all the DIEs in the CU, all the types
8233 should be complete, and it should now be safe to compute all of the
8235 compute_delayed_physnames (cu);
8236 do_cleanups (delayed_list_cleanup);
8238 /* Some compilers don't define a DW_AT_high_pc attribute for the
8239 compilation unit. If the DW_AT_high_pc is missing, synthesize
8240 it, by scanning the DIE's below the compilation unit. */
8241 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8243 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8244 static_block = end_symtab_get_static_block (addr, 0, 1);
8246 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8247 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8248 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8249 addrmap to help ensure it has an accurate map of pc values belonging to
8251 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8253 cust = end_symtab_from_static_block (static_block,
8254 SECT_OFF_TEXT (objfile), 0);
8258 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8260 /* Set symtab language to language from DW_AT_language. If the
8261 compilation is from a C file generated by language preprocessors, do
8262 not set the language if it was already deduced by start_subfile. */
8263 if (!(cu->language == language_c
8264 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8265 COMPUNIT_FILETABS (cust)->language = cu->language;
8267 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8268 produce DW_AT_location with location lists but it can be possibly
8269 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8270 there were bugs in prologue debug info, fixed later in GCC-4.5
8271 by "unwind info for epilogues" patch (which is not directly related).
8273 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8274 needed, it would be wrong due to missing DW_AT_producer there.
8276 Still one can confuse GDB by using non-standard GCC compilation
8277 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8279 if (cu->has_loclist && gcc_4_minor >= 5)
8280 cust->locations_valid = 1;
8282 if (gcc_4_minor >= 5)
8283 cust->epilogue_unwind_valid = 1;
8285 cust->call_site_htab = cu->call_site_htab;
8288 if (dwarf2_per_objfile->using_index)
8289 per_cu->v.quick->compunit_symtab = cust;
8292 struct partial_symtab *pst = per_cu->v.psymtab;
8293 pst->compunit_symtab = cust;
8297 /* Push it for inclusion processing later. */
8298 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
8300 do_cleanups (back_to);
8303 /* Generate full symbol information for type unit PER_CU, whose DIEs have
8304 already been loaded into memory. */
8307 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
8308 enum language pretend_language)
8310 struct dwarf2_cu *cu = per_cu->cu;
8311 struct objfile *objfile = per_cu->objfile;
8312 struct compunit_symtab *cust;
8313 struct cleanup *back_to, *delayed_list_cleanup;
8314 struct signatured_type *sig_type;
8316 gdb_assert (per_cu->is_debug_types);
8317 sig_type = (struct signatured_type *) per_cu;
8320 back_to = make_cleanup (really_free_pendings, NULL);
8321 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8323 cu->list_in_scope = &file_symbols;
8325 cu->language = pretend_language;
8326 cu->language_defn = language_def (cu->language);
8328 /* The symbol tables are set up in read_type_unit_scope. */
8329 process_die (cu->dies, cu);
8331 /* For now fudge the Go package. */
8332 if (cu->language == language_go)
8333 fixup_go_packaging (cu);
8335 /* Now that we have processed all the DIEs in the CU, all the types
8336 should be complete, and it should now be safe to compute all of the
8338 compute_delayed_physnames (cu);
8339 do_cleanups (delayed_list_cleanup);
8341 /* TUs share symbol tables.
8342 If this is the first TU to use this symtab, complete the construction
8343 of it with end_expandable_symtab. Otherwise, complete the addition of
8344 this TU's symbols to the existing symtab. */
8345 if (sig_type->type_unit_group->compunit_symtab == NULL)
8347 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
8348 sig_type->type_unit_group->compunit_symtab = cust;
8352 /* Set symtab language to language from DW_AT_language. If the
8353 compilation is from a C file generated by language preprocessors,
8354 do not set the language if it was already deduced by
8356 if (!(cu->language == language_c
8357 && COMPUNIT_FILETABS (cust)->language != language_c))
8358 COMPUNIT_FILETABS (cust)->language = cu->language;
8363 augment_type_symtab ();
8364 cust = sig_type->type_unit_group->compunit_symtab;
8367 if (dwarf2_per_objfile->using_index)
8368 per_cu->v.quick->compunit_symtab = cust;
8371 struct partial_symtab *pst = per_cu->v.psymtab;
8372 pst->compunit_symtab = cust;
8376 do_cleanups (back_to);
8379 /* Process an imported unit DIE. */
8382 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8384 struct attribute *attr;
8386 /* For now we don't handle imported units in type units. */
8387 if (cu->per_cu->is_debug_types)
8389 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8390 " supported in type units [in module %s]"),
8391 objfile_name (cu->objfile));
8394 attr = dwarf2_attr (die, DW_AT_import, cu);
8397 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
8398 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8399 dwarf2_per_cu_data *per_cu
8400 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
8402 /* If necessary, add it to the queue and load its DIEs. */
8403 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8404 load_full_comp_unit (per_cu, cu->language);
8406 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8411 /* Reset the in_process bit of a die. */
8414 reset_die_in_process (void *arg)
8416 struct die_info *die = (struct die_info *) arg;
8418 die->in_process = 0;
8421 /* Process a die and its children. */
8424 process_die (struct die_info *die, struct dwarf2_cu *cu)
8426 struct cleanup *in_process;
8428 /* We should only be processing those not already in process. */
8429 gdb_assert (!die->in_process);
8431 die->in_process = 1;
8432 in_process = make_cleanup (reset_die_in_process,die);
8436 case DW_TAG_padding:
8438 case DW_TAG_compile_unit:
8439 case DW_TAG_partial_unit:
8440 read_file_scope (die, cu);
8442 case DW_TAG_type_unit:
8443 read_type_unit_scope (die, cu);
8445 case DW_TAG_subprogram:
8446 case DW_TAG_inlined_subroutine:
8447 read_func_scope (die, cu);
8449 case DW_TAG_lexical_block:
8450 case DW_TAG_try_block:
8451 case DW_TAG_catch_block:
8452 read_lexical_block_scope (die, cu);
8454 case DW_TAG_call_site:
8455 case DW_TAG_GNU_call_site:
8456 read_call_site_scope (die, cu);
8458 case DW_TAG_class_type:
8459 case DW_TAG_interface_type:
8460 case DW_TAG_structure_type:
8461 case DW_TAG_union_type:
8462 process_structure_scope (die, cu);
8464 case DW_TAG_enumeration_type:
8465 process_enumeration_scope (die, cu);
8468 /* These dies have a type, but processing them does not create
8469 a symbol or recurse to process the children. Therefore we can
8470 read them on-demand through read_type_die. */
8471 case DW_TAG_subroutine_type:
8472 case DW_TAG_set_type:
8473 case DW_TAG_array_type:
8474 case DW_TAG_pointer_type:
8475 case DW_TAG_ptr_to_member_type:
8476 case DW_TAG_reference_type:
8477 case DW_TAG_rvalue_reference_type:
8478 case DW_TAG_string_type:
8481 case DW_TAG_base_type:
8482 case DW_TAG_subrange_type:
8483 case DW_TAG_typedef:
8484 /* Add a typedef symbol for the type definition, if it has a
8486 new_symbol (die, read_type_die (die, cu), cu);
8488 case DW_TAG_common_block:
8489 read_common_block (die, cu);
8491 case DW_TAG_common_inclusion:
8493 case DW_TAG_namespace:
8494 cu->processing_has_namespace_info = 1;
8495 read_namespace (die, cu);
8498 cu->processing_has_namespace_info = 1;
8499 read_module (die, cu);
8501 case DW_TAG_imported_declaration:
8502 cu->processing_has_namespace_info = 1;
8503 if (read_namespace_alias (die, cu))
8505 /* The declaration is not a global namespace alias: fall through. */
8506 case DW_TAG_imported_module:
8507 cu->processing_has_namespace_info = 1;
8508 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8509 || cu->language != language_fortran))
8510 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8511 dwarf_tag_name (die->tag));
8512 read_import_statement (die, cu);
8515 case DW_TAG_imported_unit:
8516 process_imported_unit_die (die, cu);
8520 new_symbol (die, NULL, cu);
8524 do_cleanups (in_process);
8527 /* DWARF name computation. */
8529 /* A helper function for dwarf2_compute_name which determines whether DIE
8530 needs to have the name of the scope prepended to the name listed in the
8534 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8536 struct attribute *attr;
8540 case DW_TAG_namespace:
8541 case DW_TAG_typedef:
8542 case DW_TAG_class_type:
8543 case DW_TAG_interface_type:
8544 case DW_TAG_structure_type:
8545 case DW_TAG_union_type:
8546 case DW_TAG_enumeration_type:
8547 case DW_TAG_enumerator:
8548 case DW_TAG_subprogram:
8549 case DW_TAG_inlined_subroutine:
8551 case DW_TAG_imported_declaration:
8554 case DW_TAG_variable:
8555 case DW_TAG_constant:
8556 /* We only need to prefix "globally" visible variables. These include
8557 any variable marked with DW_AT_external or any variable that
8558 lives in a namespace. [Variables in anonymous namespaces
8559 require prefixing, but they are not DW_AT_external.] */
8561 if (dwarf2_attr (die, DW_AT_specification, cu))
8563 struct dwarf2_cu *spec_cu = cu;
8565 return die_needs_namespace (die_specification (die, &spec_cu),
8569 attr = dwarf2_attr (die, DW_AT_external, cu);
8570 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8571 && die->parent->tag != DW_TAG_module)
8573 /* A variable in a lexical block of some kind does not need a
8574 namespace, even though in C++ such variables may be external
8575 and have a mangled name. */
8576 if (die->parent->tag == DW_TAG_lexical_block
8577 || die->parent->tag == DW_TAG_try_block
8578 || die->parent->tag == DW_TAG_catch_block
8579 || die->parent->tag == DW_TAG_subprogram)
8588 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8589 compute the physname for the object, which include a method's:
8590 - formal parameters (C++),
8591 - receiver type (Go),
8593 The term "physname" is a bit confusing.
8594 For C++, for example, it is the demangled name.
8595 For Go, for example, it's the mangled name.
8597 For Ada, return the DIE's linkage name rather than the fully qualified
8598 name. PHYSNAME is ignored..
8600 The result is allocated on the objfile_obstack and canonicalized. */
8603 dwarf2_compute_name (const char *name,
8604 struct die_info *die, struct dwarf2_cu *cu,
8607 struct objfile *objfile = cu->objfile;
8610 name = dwarf2_name (die, cu);
8612 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8613 but otherwise compute it by typename_concat inside GDB.
8614 FIXME: Actually this is not really true, or at least not always true.
8615 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8616 Fortran names because there is no mangling standard. So new_symbol_full
8617 will set the demangled name to the result of dwarf2_full_name, and it is
8618 the demangled name that GDB uses if it exists. */
8619 if (cu->language == language_ada
8620 || (cu->language == language_fortran && physname))
8622 /* For Ada unit, we prefer the linkage name over the name, as
8623 the former contains the exported name, which the user expects
8624 to be able to reference. Ideally, we want the user to be able
8625 to reference this entity using either natural or linkage name,
8626 but we haven't started looking at this enhancement yet. */
8627 const char *linkage_name;
8629 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8630 if (linkage_name == NULL)
8631 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8632 if (linkage_name != NULL)
8633 return linkage_name;
8636 /* These are the only languages we know how to qualify names in. */
8638 && (cu->language == language_cplus
8639 || cu->language == language_fortran || cu->language == language_d
8640 || cu->language == language_rust))
8642 if (die_needs_namespace (die, cu))
8646 const char *canonical_name = NULL;
8650 prefix = determine_prefix (die, cu);
8651 if (*prefix != '\0')
8653 char *prefixed_name = typename_concat (NULL, prefix, name,
8656 buf.puts (prefixed_name);
8657 xfree (prefixed_name);
8662 /* Template parameters may be specified in the DIE's DW_AT_name, or
8663 as children with DW_TAG_template_type_param or
8664 DW_TAG_value_type_param. If the latter, add them to the name
8665 here. If the name already has template parameters, then
8666 skip this step; some versions of GCC emit both, and
8667 it is more efficient to use the pre-computed name.
8669 Something to keep in mind about this process: it is very
8670 unlikely, or in some cases downright impossible, to produce
8671 something that will match the mangled name of a function.
8672 If the definition of the function has the same debug info,
8673 we should be able to match up with it anyway. But fallbacks
8674 using the minimal symbol, for instance to find a method
8675 implemented in a stripped copy of libstdc++, will not work.
8676 If we do not have debug info for the definition, we will have to
8677 match them up some other way.
8679 When we do name matching there is a related problem with function
8680 templates; two instantiated function templates are allowed to
8681 differ only by their return types, which we do not add here. */
8683 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8685 struct attribute *attr;
8686 struct die_info *child;
8689 die->building_fullname = 1;
8691 for (child = die->child; child != NULL; child = child->sibling)
8695 const gdb_byte *bytes;
8696 struct dwarf2_locexpr_baton *baton;
8699 if (child->tag != DW_TAG_template_type_param
8700 && child->tag != DW_TAG_template_value_param)
8711 attr = dwarf2_attr (child, DW_AT_type, cu);
8714 complaint (&symfile_complaints,
8715 _("template parameter missing DW_AT_type"));
8716 buf.puts ("UNKNOWN_TYPE");
8719 type = die_type (child, cu);
8721 if (child->tag == DW_TAG_template_type_param)
8723 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
8727 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8730 complaint (&symfile_complaints,
8731 _("template parameter missing "
8732 "DW_AT_const_value"));
8733 buf.puts ("UNKNOWN_VALUE");
8737 dwarf2_const_value_attr (attr, type, name,
8738 &cu->comp_unit_obstack, cu,
8739 &value, &bytes, &baton);
8741 if (TYPE_NOSIGN (type))
8742 /* GDB prints characters as NUMBER 'CHAR'. If that's
8743 changed, this can use value_print instead. */
8744 c_printchar (value, type, &buf);
8747 struct value_print_options opts;
8750 v = dwarf2_evaluate_loc_desc (type, NULL,
8754 else if (bytes != NULL)
8756 v = allocate_value (type);
8757 memcpy (value_contents_writeable (v), bytes,
8758 TYPE_LENGTH (type));
8761 v = value_from_longest (type, value);
8763 /* Specify decimal so that we do not depend on
8765 get_formatted_print_options (&opts, 'd');
8767 value_print (v, &buf, &opts);
8773 die->building_fullname = 0;
8777 /* Close the argument list, with a space if necessary
8778 (nested templates). */
8779 if (!buf.empty () && buf.string ().back () == '>')
8786 /* For C++ methods, append formal parameter type
8787 information, if PHYSNAME. */
8789 if (physname && die->tag == DW_TAG_subprogram
8790 && cu->language == language_cplus)
8792 struct type *type = read_type_die (die, cu);
8794 c_type_print_args (type, &buf, 1, cu->language,
8795 &type_print_raw_options);
8797 if (cu->language == language_cplus)
8799 /* Assume that an artificial first parameter is
8800 "this", but do not crash if it is not. RealView
8801 marks unnamed (and thus unused) parameters as
8802 artificial; there is no way to differentiate
8804 if (TYPE_NFIELDS (type) > 0
8805 && TYPE_FIELD_ARTIFICIAL (type, 0)
8806 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8807 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8809 buf.puts (" const");
8813 const std::string &intermediate_name = buf.string ();
8815 if (cu->language == language_cplus)
8817 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8818 &objfile->per_bfd->storage_obstack);
8820 /* If we only computed INTERMEDIATE_NAME, or if
8821 INTERMEDIATE_NAME is already canonical, then we need to
8822 copy it to the appropriate obstack. */
8823 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
8824 name = ((const char *)
8825 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8826 intermediate_name.c_str (),
8827 intermediate_name.length ()));
8829 name = canonical_name;
8836 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8837 If scope qualifiers are appropriate they will be added. The result
8838 will be allocated on the storage_obstack, or NULL if the DIE does
8839 not have a name. NAME may either be from a previous call to
8840 dwarf2_name or NULL.
8842 The output string will be canonicalized (if C++). */
8845 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8847 return dwarf2_compute_name (name, die, cu, 0);
8850 /* Construct a physname for the given DIE in CU. NAME may either be
8851 from a previous call to dwarf2_name or NULL. The result will be
8852 allocated on the objfile_objstack or NULL if the DIE does not have a
8855 The output string will be canonicalized (if C++). */
8858 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8860 struct objfile *objfile = cu->objfile;
8861 const char *retval, *mangled = NULL, *canon = NULL;
8862 struct cleanup *back_to;
8865 /* In this case dwarf2_compute_name is just a shortcut not building anything
8867 if (!die_needs_namespace (die, cu))
8868 return dwarf2_compute_name (name, die, cu, 1);
8870 back_to = make_cleanup (null_cleanup, NULL);
8872 mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8873 if (mangled == NULL)
8874 mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8876 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
8877 See https://github.com/rust-lang/rust/issues/32925. */
8878 if (cu->language == language_rust && mangled != NULL
8879 && strchr (mangled, '{') != NULL)
8882 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8884 if (mangled != NULL)
8888 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8889 type. It is easier for GDB users to search for such functions as
8890 `name(params)' than `long name(params)'. In such case the minimal
8891 symbol names do not match the full symbol names but for template
8892 functions there is never a need to look up their definition from their
8893 declaration so the only disadvantage remains the minimal symbol
8894 variant `long name(params)' does not have the proper inferior type.
8897 if (cu->language == language_go)
8899 /* This is a lie, but we already lie to the caller new_symbol_full.
8900 new_symbol_full assumes we return the mangled name.
8901 This just undoes that lie until things are cleaned up. */
8906 demangled = gdb_demangle (mangled,
8907 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
8911 make_cleanup (xfree, demangled);
8921 if (canon == NULL || check_physname)
8923 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8925 if (canon != NULL && strcmp (physname, canon) != 0)
8927 /* It may not mean a bug in GDB. The compiler could also
8928 compute DW_AT_linkage_name incorrectly. But in such case
8929 GDB would need to be bug-to-bug compatible. */
8931 complaint (&symfile_complaints,
8932 _("Computed physname <%s> does not match demangled <%s> "
8933 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8934 physname, canon, mangled, to_underlying (die->sect_off),
8935 objfile_name (objfile));
8937 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8938 is available here - over computed PHYSNAME. It is safer
8939 against both buggy GDB and buggy compilers. */
8953 retval = ((const char *)
8954 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8955 retval, strlen (retval)));
8957 do_cleanups (back_to);
8961 /* Inspect DIE in CU for a namespace alias. If one exists, record
8962 a new symbol for it.
8964 Returns 1 if a namespace alias was recorded, 0 otherwise. */
8967 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
8969 struct attribute *attr;
8971 /* If the die does not have a name, this is not a namespace
8973 attr = dwarf2_attr (die, DW_AT_name, cu);
8977 struct die_info *d = die;
8978 struct dwarf2_cu *imported_cu = cu;
8980 /* If the compiler has nested DW_AT_imported_declaration DIEs,
8981 keep inspecting DIEs until we hit the underlying import. */
8982 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
8983 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
8985 attr = dwarf2_attr (d, DW_AT_import, cu);
8989 d = follow_die_ref (d, attr, &imported_cu);
8990 if (d->tag != DW_TAG_imported_declaration)
8994 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
8996 complaint (&symfile_complaints,
8997 _("DIE at 0x%x has too many recursively imported "
8998 "declarations"), to_underlying (d->sect_off));
9005 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9007 type = get_die_type_at_offset (sect_off, cu->per_cu);
9008 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9010 /* This declaration is a global namespace alias. Add
9011 a symbol for it whose type is the aliased namespace. */
9012 new_symbol (die, type, cu);
9021 /* Return the using directives repository (global or local?) to use in the
9022 current context for LANGUAGE.
9024 For Ada, imported declarations can materialize renamings, which *may* be
9025 global. However it is impossible (for now?) in DWARF to distinguish
9026 "external" imported declarations and "static" ones. As all imported
9027 declarations seem to be static in all other languages, make them all CU-wide
9028 global only in Ada. */
9030 static struct using_direct **
9031 using_directives (enum language language)
9033 if (language == language_ada && context_stack_depth == 0)
9034 return &global_using_directives;
9036 return &local_using_directives;
9039 /* Read the import statement specified by the given die and record it. */
9042 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9044 struct objfile *objfile = cu->objfile;
9045 struct attribute *import_attr;
9046 struct die_info *imported_die, *child_die;
9047 struct dwarf2_cu *imported_cu;
9048 const char *imported_name;
9049 const char *imported_name_prefix;
9050 const char *canonical_name;
9051 const char *import_alias;
9052 const char *imported_declaration = NULL;
9053 const char *import_prefix;
9054 VEC (const_char_ptr) *excludes = NULL;
9055 struct cleanup *cleanups;
9057 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9058 if (import_attr == NULL)
9060 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9061 dwarf_tag_name (die->tag));
9066 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9067 imported_name = dwarf2_name (imported_die, imported_cu);
9068 if (imported_name == NULL)
9070 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9072 The import in the following code:
9086 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9087 <52> DW_AT_decl_file : 1
9088 <53> DW_AT_decl_line : 6
9089 <54> DW_AT_import : <0x75>
9090 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9092 <5b> DW_AT_decl_file : 1
9093 <5c> DW_AT_decl_line : 2
9094 <5d> DW_AT_type : <0x6e>
9096 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9097 <76> DW_AT_byte_size : 4
9098 <77> DW_AT_encoding : 5 (signed)
9100 imports the wrong die ( 0x75 instead of 0x58 ).
9101 This case will be ignored until the gcc bug is fixed. */
9105 /* Figure out the local name after import. */
9106 import_alias = dwarf2_name (die, cu);
9108 /* Figure out where the statement is being imported to. */
9109 import_prefix = determine_prefix (die, cu);
9111 /* Figure out what the scope of the imported die is and prepend it
9112 to the name of the imported die. */
9113 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9115 if (imported_die->tag != DW_TAG_namespace
9116 && imported_die->tag != DW_TAG_module)
9118 imported_declaration = imported_name;
9119 canonical_name = imported_name_prefix;
9121 else if (strlen (imported_name_prefix) > 0)
9122 canonical_name = obconcat (&objfile->objfile_obstack,
9123 imported_name_prefix,
9124 (cu->language == language_d ? "." : "::"),
9125 imported_name, (char *) NULL);
9127 canonical_name = imported_name;
9129 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
9131 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9132 for (child_die = die->child; child_die && child_die->tag;
9133 child_die = sibling_die (child_die))
9135 /* DWARF-4: A Fortran use statement with a “rename list” may be
9136 represented by an imported module entry with an import attribute
9137 referring to the module and owned entries corresponding to those
9138 entities that are renamed as part of being imported. */
9140 if (child_die->tag != DW_TAG_imported_declaration)
9142 complaint (&symfile_complaints,
9143 _("child DW_TAG_imported_declaration expected "
9144 "- DIE at 0x%x [in module %s]"),
9145 to_underlying (child_die->sect_off), objfile_name (objfile));
9149 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9150 if (import_attr == NULL)
9152 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9153 dwarf_tag_name (child_die->tag));
9158 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9160 imported_name = dwarf2_name (imported_die, imported_cu);
9161 if (imported_name == NULL)
9163 complaint (&symfile_complaints,
9164 _("child DW_TAG_imported_declaration has unknown "
9165 "imported name - DIE at 0x%x [in module %s]"),
9166 to_underlying (child_die->sect_off), objfile_name (objfile));
9170 VEC_safe_push (const_char_ptr, excludes, imported_name);
9172 process_die (child_die, cu);
9175 add_using_directive (using_directives (cu->language),
9179 imported_declaration,
9182 &objfile->objfile_obstack);
9184 do_cleanups (cleanups);
9187 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9188 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9189 this, it was first present in GCC release 4.3.0. */
9192 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9194 if (!cu->checked_producer)
9195 check_producer (cu);
9197 return cu->producer_is_gcc_lt_4_3;
9200 static file_and_directory
9201 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9203 file_and_directory res;
9205 /* Find the filename. Do not use dwarf2_name here, since the filename
9206 is not a source language identifier. */
9207 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9208 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9210 if (res.comp_dir == NULL
9211 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9212 && IS_ABSOLUTE_PATH (res.name))
9214 res.comp_dir_storage = ldirname (res.name);
9215 if (!res.comp_dir_storage.empty ())
9216 res.comp_dir = res.comp_dir_storage.c_str ();
9218 if (res.comp_dir != NULL)
9220 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9221 directory, get rid of it. */
9222 const char *cp = strchr (res.comp_dir, ':');
9224 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9225 res.comp_dir = cp + 1;
9228 if (res.name == NULL)
9229 res.name = "<unknown>";
9234 /* Handle DW_AT_stmt_list for a compilation unit.
9235 DIE is the DW_TAG_compile_unit die for CU.
9236 COMP_DIR is the compilation directory. LOWPC is passed to
9237 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9240 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9241 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9243 struct objfile *objfile = dwarf2_per_objfile->objfile;
9244 struct attribute *attr;
9245 struct line_header line_header_local;
9246 hashval_t line_header_local_hash;
9251 gdb_assert (! cu->per_cu->is_debug_types);
9253 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9257 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9259 /* The line header hash table is only created if needed (it exists to
9260 prevent redundant reading of the line table for partial_units).
9261 If we're given a partial_unit, we'll need it. If we're given a
9262 compile_unit, then use the line header hash table if it's already
9263 created, but don't create one just yet. */
9265 if (dwarf2_per_objfile->line_header_hash == NULL
9266 && die->tag == DW_TAG_partial_unit)
9268 dwarf2_per_objfile->line_header_hash
9269 = htab_create_alloc_ex (127, line_header_hash_voidp,
9270 line_header_eq_voidp,
9271 free_line_header_voidp,
9272 &objfile->objfile_obstack,
9273 hashtab_obstack_allocate,
9274 dummy_obstack_deallocate);
9277 line_header_local.sect_off = line_offset;
9278 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9279 line_header_local_hash = line_header_hash (&line_header_local);
9280 if (dwarf2_per_objfile->line_header_hash != NULL)
9282 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9284 line_header_local_hash, NO_INSERT);
9286 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9287 is not present in *SLOT (since if there is something in *SLOT then
9288 it will be for a partial_unit). */
9289 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9291 gdb_assert (*slot != NULL);
9292 cu->line_header = (struct line_header *) *slot;
9297 /* dwarf_decode_line_header does not yet provide sufficient information.
9298 We always have to call also dwarf_decode_lines for it. */
9299 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
9302 cu->line_header = lh.get ();
9304 if (dwarf2_per_objfile->line_header_hash == NULL)
9308 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9310 line_header_local_hash, INSERT);
9311 gdb_assert (slot != NULL);
9313 if (slot != NULL && *slot == NULL)
9315 /* This newly decoded line number information unit will be owned
9316 by line_header_hash hash table. */
9317 *slot = cu->line_header;
9321 /* We cannot free any current entry in (*slot) as that struct line_header
9322 may be already used by multiple CUs. Create only temporary decoded
9323 line_header for this CU - it may happen at most once for each line
9324 number information unit. And if we're not using line_header_hash
9325 then this is what we want as well. */
9326 gdb_assert (die->tag != DW_TAG_partial_unit);
9328 decode_mapping = (die->tag != DW_TAG_partial_unit);
9329 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9335 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9338 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9340 struct objfile *objfile = dwarf2_per_objfile->objfile;
9341 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9342 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9343 CORE_ADDR highpc = ((CORE_ADDR) 0);
9344 struct attribute *attr;
9345 struct die_info *child_die;
9348 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9350 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9352 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9353 from finish_block. */
9354 if (lowpc == ((CORE_ADDR) -1))
9356 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9358 file_and_directory fnd = find_file_and_directory (die, cu);
9360 prepare_one_comp_unit (cu, die, cu->language);
9362 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9363 standardised yet. As a workaround for the language detection we fall
9364 back to the DW_AT_producer string. */
9365 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9366 cu->language = language_opencl;
9368 /* Similar hack for Go. */
9369 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9370 set_cu_language (DW_LANG_Go, cu);
9372 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
9374 /* Decode line number information if present. We do this before
9375 processing child DIEs, so that the line header table is available
9376 for DW_AT_decl_file. */
9377 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
9379 /* Process all dies in compilation unit. */
9380 if (die->child != NULL)
9382 child_die = die->child;
9383 while (child_die && child_die->tag)
9385 process_die (child_die, cu);
9386 child_die = sibling_die (child_die);
9390 /* Decode macro information, if present. Dwarf 2 macro information
9391 refers to information in the line number info statement program
9392 header, so we can only read it if we've read the header
9394 attr = dwarf2_attr (die, DW_AT_macros, cu);
9396 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9397 if (attr && cu->line_header)
9399 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9400 complaint (&symfile_complaints,
9401 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
9403 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9407 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9408 if (attr && cu->line_header)
9410 unsigned int macro_offset = DW_UNSND (attr);
9412 dwarf_decode_macros (cu, macro_offset, 0);
9417 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9418 Create the set of symtabs used by this TU, or if this TU is sharing
9419 symtabs with another TU and the symtabs have already been created
9420 then restore those symtabs in the line header.
9421 We don't need the pc/line-number mapping for type units. */
9424 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9426 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9427 struct type_unit_group *tu_group;
9429 struct attribute *attr;
9431 struct signatured_type *sig_type;
9433 gdb_assert (per_cu->is_debug_types);
9434 sig_type = (struct signatured_type *) per_cu;
9436 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9438 /* If we're using .gdb_index (includes -readnow) then
9439 per_cu->type_unit_group may not have been set up yet. */
9440 if (sig_type->type_unit_group == NULL)
9441 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9442 tu_group = sig_type->type_unit_group;
9444 /* If we've already processed this stmt_list there's no real need to
9445 do it again, we could fake it and just recreate the part we need
9446 (file name,index -> symtab mapping). If data shows this optimization
9447 is useful we can do it then. */
9448 first_time = tu_group->compunit_symtab == NULL;
9450 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9455 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9456 lh = dwarf_decode_line_header (line_offset, cu);
9461 dwarf2_start_symtab (cu, "", NULL, 0);
9464 gdb_assert (tu_group->symtabs == NULL);
9465 restart_symtab (tu_group->compunit_symtab, "", 0);
9470 cu->line_header = lh.get ();
9474 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9476 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9477 still initializing it, and our caller (a few levels up)
9478 process_full_type_unit still needs to know if this is the first
9481 tu_group->num_symtabs = lh->file_names.size ();
9482 tu_group->symtabs = XNEWVEC (struct symtab *, lh->file_names.size ());
9484 for (i = 0; i < lh->file_names.size (); ++i)
9486 file_entry &fe = lh->file_names[i];
9488 dwarf2_start_subfile (fe.name, fe.include_dir (lh.get ()));
9490 if (current_subfile->symtab == NULL)
9492 /* NOTE: start_subfile will recognize when it's been passed
9493 a file it has already seen. So we can't assume there's a
9494 simple mapping from lh->file_names to subfiles, plus
9495 lh->file_names may contain dups. */
9496 current_subfile->symtab
9497 = allocate_symtab (cust, current_subfile->name);
9500 fe.symtab = current_subfile->symtab;
9501 tu_group->symtabs[i] = fe.symtab;
9506 restart_symtab (tu_group->compunit_symtab, "", 0);
9508 for (i = 0; i < lh->file_names.size (); ++i)
9510 struct file_entry *fe = &lh->file_names[i];
9512 fe->symtab = tu_group->symtabs[i];
9518 /* The main symtab is allocated last. Type units don't have DW_AT_name
9519 so they don't have a "real" (so to speak) symtab anyway.
9520 There is later code that will assign the main symtab to all symbols
9521 that don't have one. We need to handle the case of a symbol with a
9522 missing symtab (DW_AT_decl_file) anyway. */
9525 /* Process DW_TAG_type_unit.
9526 For TUs we want to skip the first top level sibling if it's not the
9527 actual type being defined by this TU. In this case the first top
9528 level sibling is there to provide context only. */
9531 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9533 struct die_info *child_die;
9535 prepare_one_comp_unit (cu, die, language_minimal);
9537 /* Initialize (or reinitialize) the machinery for building symtabs.
9538 We do this before processing child DIEs, so that the line header table
9539 is available for DW_AT_decl_file. */
9540 setup_type_unit_groups (die, cu);
9542 if (die->child != NULL)
9544 child_die = die->child;
9545 while (child_die && child_die->tag)
9547 process_die (child_die, cu);
9548 child_die = sibling_die (child_die);
9555 http://gcc.gnu.org/wiki/DebugFission
9556 http://gcc.gnu.org/wiki/DebugFissionDWP
9558 To simplify handling of both DWO files ("object" files with the DWARF info)
9559 and DWP files (a file with the DWOs packaged up into one file), we treat
9560 DWP files as having a collection of virtual DWO files. */
9563 hash_dwo_file (const void *item)
9565 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9568 hash = htab_hash_string (dwo_file->dwo_name);
9569 if (dwo_file->comp_dir != NULL)
9570 hash += htab_hash_string (dwo_file->comp_dir);
9575 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9577 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9578 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9580 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9582 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9583 return lhs->comp_dir == rhs->comp_dir;
9584 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9587 /* Allocate a hash table for DWO files. */
9590 allocate_dwo_file_hash_table (void)
9592 struct objfile *objfile = dwarf2_per_objfile->objfile;
9594 return htab_create_alloc_ex (41,
9598 &objfile->objfile_obstack,
9599 hashtab_obstack_allocate,
9600 dummy_obstack_deallocate);
9603 /* Lookup DWO file DWO_NAME. */
9606 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9608 struct dwo_file find_entry;
9611 if (dwarf2_per_objfile->dwo_files == NULL)
9612 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9614 memset (&find_entry, 0, sizeof (find_entry));
9615 find_entry.dwo_name = dwo_name;
9616 find_entry.comp_dir = comp_dir;
9617 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9623 hash_dwo_unit (const void *item)
9625 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9627 /* This drops the top 32 bits of the id, but is ok for a hash. */
9628 return dwo_unit->signature;
9632 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9634 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9635 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9637 /* The signature is assumed to be unique within the DWO file.
9638 So while object file CU dwo_id's always have the value zero,
9639 that's OK, assuming each object file DWO file has only one CU,
9640 and that's the rule for now. */
9641 return lhs->signature == rhs->signature;
9644 /* Allocate a hash table for DWO CUs,TUs.
9645 There is one of these tables for each of CUs,TUs for each DWO file. */
9648 allocate_dwo_unit_table (struct objfile *objfile)
9650 /* Start out with a pretty small number.
9651 Generally DWO files contain only one CU and maybe some TUs. */
9652 return htab_create_alloc_ex (3,
9656 &objfile->objfile_obstack,
9657 hashtab_obstack_allocate,
9658 dummy_obstack_deallocate);
9661 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9663 struct create_dwo_cu_data
9665 struct dwo_file *dwo_file;
9666 struct dwo_unit dwo_unit;
9669 /* die_reader_func for create_dwo_cu. */
9672 create_dwo_cu_reader (const struct die_reader_specs *reader,
9673 const gdb_byte *info_ptr,
9674 struct die_info *comp_unit_die,
9678 struct dwarf2_cu *cu = reader->cu;
9679 sect_offset sect_off = cu->per_cu->sect_off;
9680 struct dwarf2_section_info *section = cu->per_cu->section;
9681 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9682 struct dwo_file *dwo_file = data->dwo_file;
9683 struct dwo_unit *dwo_unit = &data->dwo_unit;
9684 struct attribute *attr;
9686 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9689 complaint (&symfile_complaints,
9690 _("Dwarf Error: debug entry at offset 0x%x is missing"
9691 " its dwo_id [in module %s]"),
9692 to_underlying (sect_off), dwo_file->dwo_name);
9696 dwo_unit->dwo_file = dwo_file;
9697 dwo_unit->signature = DW_UNSND (attr);
9698 dwo_unit->section = section;
9699 dwo_unit->sect_off = sect_off;
9700 dwo_unit->length = cu->per_cu->length;
9702 if (dwarf_read_debug)
9703 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9704 to_underlying (sect_off),
9705 hex_string (dwo_unit->signature));
9708 /* Create the dwo_unit for the lone CU in DWO_FILE.
9709 Note: This function processes DWO files only, not DWP files. */
9711 static struct dwo_unit *
9712 create_dwo_cu (struct dwo_file *dwo_file)
9714 struct objfile *objfile = dwarf2_per_objfile->objfile;
9715 struct dwarf2_section_info *section = &dwo_file->sections.info;
9716 const gdb_byte *info_ptr, *end_ptr;
9717 struct create_dwo_cu_data create_dwo_cu_data;
9718 struct dwo_unit *dwo_unit;
9720 dwarf2_read_section (objfile, section);
9721 info_ptr = section->buffer;
9723 if (info_ptr == NULL)
9726 if (dwarf_read_debug)
9728 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9729 get_section_name (section),
9730 get_section_file_name (section));
9733 create_dwo_cu_data.dwo_file = dwo_file;
9736 end_ptr = info_ptr + section->size;
9737 while (info_ptr < end_ptr)
9739 struct dwarf2_per_cu_data per_cu;
9741 memset (&create_dwo_cu_data.dwo_unit, 0,
9742 sizeof (create_dwo_cu_data.dwo_unit));
9743 memset (&per_cu, 0, sizeof (per_cu));
9744 per_cu.objfile = objfile;
9745 per_cu.is_debug_types = 0;
9746 per_cu.sect_off = sect_offset (info_ptr - section->buffer);
9747 per_cu.section = section;
9749 init_cutu_and_read_dies_no_follow (&per_cu, dwo_file,
9750 create_dwo_cu_reader,
9751 &create_dwo_cu_data);
9753 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
9755 /* If we've already found one, complain. We only support one
9756 because having more than one requires hacking the dwo_name of
9757 each to match, which is highly unlikely to happen. */
9758 if (dwo_unit != NULL)
9760 complaint (&symfile_complaints,
9761 _("Multiple CUs in DWO file %s [in module %s]"),
9762 dwo_file->dwo_name, objfile_name (objfile));
9766 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9767 *dwo_unit = create_dwo_cu_data.dwo_unit;
9770 info_ptr += per_cu.length;
9776 /* DWP file .debug_{cu,tu}_index section format:
9777 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9781 Both index sections have the same format, and serve to map a 64-bit
9782 signature to a set of section numbers. Each section begins with a header,
9783 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9784 indexes, and a pool of 32-bit section numbers. The index sections will be
9785 aligned at 8-byte boundaries in the file.
9787 The index section header consists of:
9789 V, 32 bit version number
9791 N, 32 bit number of compilation units or type units in the index
9792 M, 32 bit number of slots in the hash table
9794 Numbers are recorded using the byte order of the application binary.
9796 The hash table begins at offset 16 in the section, and consists of an array
9797 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9798 order of the application binary). Unused slots in the hash table are 0.
9799 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9801 The parallel table begins immediately after the hash table
9802 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9803 array of 32-bit indexes (using the byte order of the application binary),
9804 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9805 table contains a 32-bit index into the pool of section numbers. For unused
9806 hash table slots, the corresponding entry in the parallel table will be 0.
9808 The pool of section numbers begins immediately following the hash table
9809 (at offset 16 + 12 * M from the beginning of the section). The pool of
9810 section numbers consists of an array of 32-bit words (using the byte order
9811 of the application binary). Each item in the array is indexed starting
9812 from 0. The hash table entry provides the index of the first section
9813 number in the set. Additional section numbers in the set follow, and the
9814 set is terminated by a 0 entry (section number 0 is not used in ELF).
9816 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9817 section must be the first entry in the set, and the .debug_abbrev.dwo must
9818 be the second entry. Other members of the set may follow in any order.
9824 DWP Version 2 combines all the .debug_info, etc. sections into one,
9825 and the entries in the index tables are now offsets into these sections.
9826 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9829 Index Section Contents:
9831 Hash Table of Signatures dwp_hash_table.hash_table
9832 Parallel Table of Indices dwp_hash_table.unit_table
9833 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9834 Table of Section Sizes dwp_hash_table.v2.sizes
9836 The index section header consists of:
9838 V, 32 bit version number
9839 L, 32 bit number of columns in the table of section offsets
9840 N, 32 bit number of compilation units or type units in the index
9841 M, 32 bit number of slots in the hash table
9843 Numbers are recorded using the byte order of the application binary.
9845 The hash table has the same format as version 1.
9846 The parallel table of indices has the same format as version 1,
9847 except that the entries are origin-1 indices into the table of sections
9848 offsets and the table of section sizes.
9850 The table of offsets begins immediately following the parallel table
9851 (at offset 16 + 12 * M from the beginning of the section). The table is
9852 a two-dimensional array of 32-bit words (using the byte order of the
9853 application binary), with L columns and N+1 rows, in row-major order.
9854 Each row in the array is indexed starting from 0. The first row provides
9855 a key to the remaining rows: each column in this row provides an identifier
9856 for a debug section, and the offsets in the same column of subsequent rows
9857 refer to that section. The section identifiers are:
9859 DW_SECT_INFO 1 .debug_info.dwo
9860 DW_SECT_TYPES 2 .debug_types.dwo
9861 DW_SECT_ABBREV 3 .debug_abbrev.dwo
9862 DW_SECT_LINE 4 .debug_line.dwo
9863 DW_SECT_LOC 5 .debug_loc.dwo
9864 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
9865 DW_SECT_MACINFO 7 .debug_macinfo.dwo
9866 DW_SECT_MACRO 8 .debug_macro.dwo
9868 The offsets provided by the CU and TU index sections are the base offsets
9869 for the contributions made by each CU or TU to the corresponding section
9870 in the package file. Each CU and TU header contains an abbrev_offset
9871 field, used to find the abbreviations table for that CU or TU within the
9872 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
9873 be interpreted as relative to the base offset given in the index section.
9874 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
9875 should be interpreted as relative to the base offset for .debug_line.dwo,
9876 and offsets into other debug sections obtained from DWARF attributes should
9877 also be interpreted as relative to the corresponding base offset.
9879 The table of sizes begins immediately following the table of offsets.
9880 Like the table of offsets, it is a two-dimensional array of 32-bit words,
9881 with L columns and N rows, in row-major order. Each row in the array is
9882 indexed starting from 1 (row 0 is shared by the two tables).
9886 Hash table lookup is handled the same in version 1 and 2:
9888 We assume that N and M will not exceed 2^32 - 1.
9889 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
9891 Given a 64-bit compilation unit signature or a type signature S, an entry
9892 in the hash table is located as follows:
9894 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
9895 the low-order k bits all set to 1.
9897 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
9899 3) If the hash table entry at index H matches the signature, use that
9900 entry. If the hash table entry at index H is unused (all zeroes),
9901 terminate the search: the signature is not present in the table.
9903 4) Let H = (H + H') modulo M. Repeat at Step 3.
9905 Because M > N and H' and M are relatively prime, the search is guaranteed
9906 to stop at an unused slot or find the match. */
9908 /* Create a hash table to map DWO IDs to their CU/TU entry in
9909 .debug_{info,types}.dwo in DWP_FILE.
9910 Returns NULL if there isn't one.
9911 Note: This function processes DWP files only, not DWO files. */
9913 static struct dwp_hash_table *
9914 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
9916 struct objfile *objfile = dwarf2_per_objfile->objfile;
9917 bfd *dbfd = dwp_file->dbfd;
9918 const gdb_byte *index_ptr, *index_end;
9919 struct dwarf2_section_info *index;
9920 uint32_t version, nr_columns, nr_units, nr_slots;
9921 struct dwp_hash_table *htab;
9924 index = &dwp_file->sections.tu_index;
9926 index = &dwp_file->sections.cu_index;
9928 if (dwarf2_section_empty_p (index))
9930 dwarf2_read_section (objfile, index);
9932 index_ptr = index->buffer;
9933 index_end = index_ptr + index->size;
9935 version = read_4_bytes (dbfd, index_ptr);
9938 nr_columns = read_4_bytes (dbfd, index_ptr);
9942 nr_units = read_4_bytes (dbfd, index_ptr);
9944 nr_slots = read_4_bytes (dbfd, index_ptr);
9947 if (version != 1 && version != 2)
9949 error (_("Dwarf Error: unsupported DWP file version (%s)"
9951 pulongest (version), dwp_file->name);
9953 if (nr_slots != (nr_slots & -nr_slots))
9955 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9956 " is not power of 2 [in module %s]"),
9957 pulongest (nr_slots), dwp_file->name);
9960 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9961 htab->version = version;
9962 htab->nr_columns = nr_columns;
9963 htab->nr_units = nr_units;
9964 htab->nr_slots = nr_slots;
9965 htab->hash_table = index_ptr;
9966 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9968 /* Exit early if the table is empty. */
9969 if (nr_slots == 0 || nr_units == 0
9970 || (version == 2 && nr_columns == 0))
9972 /* All must be zero. */
9973 if (nr_slots != 0 || nr_units != 0
9974 || (version == 2 && nr_columns != 0))
9976 complaint (&symfile_complaints,
9977 _("Empty DWP but nr_slots,nr_units,nr_columns not"
9978 " all zero [in modules %s]"),
9986 htab->section_pool.v1.indices =
9987 htab->unit_table + sizeof (uint32_t) * nr_slots;
9988 /* It's harder to decide whether the section is too small in v1.
9989 V1 is deprecated anyway so we punt. */
9993 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
9994 int *ids = htab->section_pool.v2.section_ids;
9995 /* Reverse map for error checking. */
9996 int ids_seen[DW_SECT_MAX + 1];
10001 error (_("Dwarf Error: bad DWP hash table, too few columns"
10002 " in section table [in module %s]"),
10005 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10007 error (_("Dwarf Error: bad DWP hash table, too many columns"
10008 " in section table [in module %s]"),
10011 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10012 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10013 for (i = 0; i < nr_columns; ++i)
10015 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10017 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10019 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10020 " in section table [in module %s]"),
10021 id, dwp_file->name);
10023 if (ids_seen[id] != -1)
10025 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10026 " id %d in section table [in module %s]"),
10027 id, dwp_file->name);
10032 /* Must have exactly one info or types section. */
10033 if (((ids_seen[DW_SECT_INFO] != -1)
10034 + (ids_seen[DW_SECT_TYPES] != -1))
10037 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10038 " DWO info/types section [in module %s]"),
10041 /* Must have an abbrev section. */
10042 if (ids_seen[DW_SECT_ABBREV] == -1)
10044 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10045 " section [in module %s]"),
10048 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10049 htab->section_pool.v2.sizes =
10050 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10051 * nr_units * nr_columns);
10052 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10053 * nr_units * nr_columns))
10056 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10057 " [in module %s]"),
10065 /* Update SECTIONS with the data from SECTP.
10067 This function is like the other "locate" section routines that are
10068 passed to bfd_map_over_sections, but in this context the sections to
10069 read comes from the DWP V1 hash table, not the full ELF section table.
10071 The result is non-zero for success, or zero if an error was found. */
10074 locate_v1_virtual_dwo_sections (asection *sectp,
10075 struct virtual_v1_dwo_sections *sections)
10077 const struct dwop_section_names *names = &dwop_section_names;
10079 if (section_is_p (sectp->name, &names->abbrev_dwo))
10081 /* There can be only one. */
10082 if (sections->abbrev.s.section != NULL)
10084 sections->abbrev.s.section = sectp;
10085 sections->abbrev.size = bfd_get_section_size (sectp);
10087 else if (section_is_p (sectp->name, &names->info_dwo)
10088 || section_is_p (sectp->name, &names->types_dwo))
10090 /* There can be only one. */
10091 if (sections->info_or_types.s.section != NULL)
10093 sections->info_or_types.s.section = sectp;
10094 sections->info_or_types.size = bfd_get_section_size (sectp);
10096 else if (section_is_p (sectp->name, &names->line_dwo))
10098 /* There can be only one. */
10099 if (sections->line.s.section != NULL)
10101 sections->line.s.section = sectp;
10102 sections->line.size = bfd_get_section_size (sectp);
10104 else if (section_is_p (sectp->name, &names->loc_dwo))
10106 /* There can be only one. */
10107 if (sections->loc.s.section != NULL)
10109 sections->loc.s.section = sectp;
10110 sections->loc.size = bfd_get_section_size (sectp);
10112 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10114 /* There can be only one. */
10115 if (sections->macinfo.s.section != NULL)
10117 sections->macinfo.s.section = sectp;
10118 sections->macinfo.size = bfd_get_section_size (sectp);
10120 else if (section_is_p (sectp->name, &names->macro_dwo))
10122 /* There can be only one. */
10123 if (sections->macro.s.section != NULL)
10125 sections->macro.s.section = sectp;
10126 sections->macro.size = bfd_get_section_size (sectp);
10128 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10130 /* There can be only one. */
10131 if (sections->str_offsets.s.section != NULL)
10133 sections->str_offsets.s.section = sectp;
10134 sections->str_offsets.size = bfd_get_section_size (sectp);
10138 /* No other kind of section is valid. */
10145 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10146 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10147 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10148 This is for DWP version 1 files. */
10150 static struct dwo_unit *
10151 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10152 uint32_t unit_index,
10153 const char *comp_dir,
10154 ULONGEST signature, int is_debug_types)
10156 struct objfile *objfile = dwarf2_per_objfile->objfile;
10157 const struct dwp_hash_table *dwp_htab =
10158 is_debug_types ? dwp_file->tus : dwp_file->cus;
10159 bfd *dbfd = dwp_file->dbfd;
10160 const char *kind = is_debug_types ? "TU" : "CU";
10161 struct dwo_file *dwo_file;
10162 struct dwo_unit *dwo_unit;
10163 struct virtual_v1_dwo_sections sections;
10164 void **dwo_file_slot;
10165 char *virtual_dwo_name;
10166 struct cleanup *cleanups;
10169 gdb_assert (dwp_file->version == 1);
10171 if (dwarf_read_debug)
10173 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10175 pulongest (unit_index), hex_string (signature),
10179 /* Fetch the sections of this DWO unit.
10180 Put a limit on the number of sections we look for so that bad data
10181 doesn't cause us to loop forever. */
10183 #define MAX_NR_V1_DWO_SECTIONS \
10184 (1 /* .debug_info or .debug_types */ \
10185 + 1 /* .debug_abbrev */ \
10186 + 1 /* .debug_line */ \
10187 + 1 /* .debug_loc */ \
10188 + 1 /* .debug_str_offsets */ \
10189 + 1 /* .debug_macro or .debug_macinfo */ \
10190 + 1 /* trailing zero */)
10192 memset (§ions, 0, sizeof (sections));
10193 cleanups = make_cleanup (null_cleanup, 0);
10195 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10198 uint32_t section_nr =
10199 read_4_bytes (dbfd,
10200 dwp_htab->section_pool.v1.indices
10201 + (unit_index + i) * sizeof (uint32_t));
10203 if (section_nr == 0)
10205 if (section_nr >= dwp_file->num_sections)
10207 error (_("Dwarf Error: bad DWP hash table, section number too large"
10208 " [in module %s]"),
10212 sectp = dwp_file->elf_sections[section_nr];
10213 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10215 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10216 " [in module %s]"),
10222 || dwarf2_section_empty_p (§ions.info_or_types)
10223 || dwarf2_section_empty_p (§ions.abbrev))
10225 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10226 " [in module %s]"),
10229 if (i == MAX_NR_V1_DWO_SECTIONS)
10231 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10232 " [in module %s]"),
10236 /* It's easier for the rest of the code if we fake a struct dwo_file and
10237 have dwo_unit "live" in that. At least for now.
10239 The DWP file can be made up of a random collection of CUs and TUs.
10240 However, for each CU + set of TUs that came from the same original DWO
10241 file, we can combine them back into a virtual DWO file to save space
10242 (fewer struct dwo_file objects to allocate). Remember that for really
10243 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10246 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10247 get_section_id (§ions.abbrev),
10248 get_section_id (§ions.line),
10249 get_section_id (§ions.loc),
10250 get_section_id (§ions.str_offsets));
10251 make_cleanup (xfree, virtual_dwo_name);
10252 /* Can we use an existing virtual DWO file? */
10253 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10254 /* Create one if necessary. */
10255 if (*dwo_file_slot == NULL)
10257 if (dwarf_read_debug)
10259 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10262 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10264 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10266 strlen (virtual_dwo_name));
10267 dwo_file->comp_dir = comp_dir;
10268 dwo_file->sections.abbrev = sections.abbrev;
10269 dwo_file->sections.line = sections.line;
10270 dwo_file->sections.loc = sections.loc;
10271 dwo_file->sections.macinfo = sections.macinfo;
10272 dwo_file->sections.macro = sections.macro;
10273 dwo_file->sections.str_offsets = sections.str_offsets;
10274 /* The "str" section is global to the entire DWP file. */
10275 dwo_file->sections.str = dwp_file->sections.str;
10276 /* The info or types section is assigned below to dwo_unit,
10277 there's no need to record it in dwo_file.
10278 Also, we can't simply record type sections in dwo_file because
10279 we record a pointer into the vector in dwo_unit. As we collect more
10280 types we'll grow the vector and eventually have to reallocate space
10281 for it, invalidating all copies of pointers into the previous
10283 *dwo_file_slot = dwo_file;
10287 if (dwarf_read_debug)
10289 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10292 dwo_file = (struct dwo_file *) *dwo_file_slot;
10294 do_cleanups (cleanups);
10296 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10297 dwo_unit->dwo_file = dwo_file;
10298 dwo_unit->signature = signature;
10299 dwo_unit->section =
10300 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10301 *dwo_unit->section = sections.info_or_types;
10302 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10307 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10308 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10309 piece within that section used by a TU/CU, return a virtual section
10310 of just that piece. */
10312 static struct dwarf2_section_info
10313 create_dwp_v2_section (struct dwarf2_section_info *section,
10314 bfd_size_type offset, bfd_size_type size)
10316 struct dwarf2_section_info result;
10319 gdb_assert (section != NULL);
10320 gdb_assert (!section->is_virtual);
10322 memset (&result, 0, sizeof (result));
10323 result.s.containing_section = section;
10324 result.is_virtual = 1;
10329 sectp = get_section_bfd_section (section);
10331 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10332 bounds of the real section. This is a pretty-rare event, so just
10333 flag an error (easier) instead of a warning and trying to cope. */
10335 || offset + size > bfd_get_section_size (sectp))
10337 bfd *abfd = sectp->owner;
10339 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10340 " in section %s [in module %s]"),
10341 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10342 objfile_name (dwarf2_per_objfile->objfile));
10345 result.virtual_offset = offset;
10346 result.size = size;
10350 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10351 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10352 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10353 This is for DWP version 2 files. */
10355 static struct dwo_unit *
10356 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10357 uint32_t unit_index,
10358 const char *comp_dir,
10359 ULONGEST signature, int is_debug_types)
10361 struct objfile *objfile = dwarf2_per_objfile->objfile;
10362 const struct dwp_hash_table *dwp_htab =
10363 is_debug_types ? dwp_file->tus : dwp_file->cus;
10364 bfd *dbfd = dwp_file->dbfd;
10365 const char *kind = is_debug_types ? "TU" : "CU";
10366 struct dwo_file *dwo_file;
10367 struct dwo_unit *dwo_unit;
10368 struct virtual_v2_dwo_sections sections;
10369 void **dwo_file_slot;
10370 char *virtual_dwo_name;
10371 struct cleanup *cleanups;
10374 gdb_assert (dwp_file->version == 2);
10376 if (dwarf_read_debug)
10378 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10380 pulongest (unit_index), hex_string (signature),
10384 /* Fetch the section offsets of this DWO unit. */
10386 memset (§ions, 0, sizeof (sections));
10387 cleanups = make_cleanup (null_cleanup, 0);
10389 for (i = 0; i < dwp_htab->nr_columns; ++i)
10391 uint32_t offset = read_4_bytes (dbfd,
10392 dwp_htab->section_pool.v2.offsets
10393 + (((unit_index - 1) * dwp_htab->nr_columns
10395 * sizeof (uint32_t)));
10396 uint32_t size = read_4_bytes (dbfd,
10397 dwp_htab->section_pool.v2.sizes
10398 + (((unit_index - 1) * dwp_htab->nr_columns
10400 * sizeof (uint32_t)));
10402 switch (dwp_htab->section_pool.v2.section_ids[i])
10405 case DW_SECT_TYPES:
10406 sections.info_or_types_offset = offset;
10407 sections.info_or_types_size = size;
10409 case DW_SECT_ABBREV:
10410 sections.abbrev_offset = offset;
10411 sections.abbrev_size = size;
10414 sections.line_offset = offset;
10415 sections.line_size = size;
10418 sections.loc_offset = offset;
10419 sections.loc_size = size;
10421 case DW_SECT_STR_OFFSETS:
10422 sections.str_offsets_offset = offset;
10423 sections.str_offsets_size = size;
10425 case DW_SECT_MACINFO:
10426 sections.macinfo_offset = offset;
10427 sections.macinfo_size = size;
10429 case DW_SECT_MACRO:
10430 sections.macro_offset = offset;
10431 sections.macro_size = size;
10436 /* It's easier for the rest of the code if we fake a struct dwo_file and
10437 have dwo_unit "live" in that. At least for now.
10439 The DWP file can be made up of a random collection of CUs and TUs.
10440 However, for each CU + set of TUs that came from the same original DWO
10441 file, we can combine them back into a virtual DWO file to save space
10442 (fewer struct dwo_file objects to allocate). Remember that for really
10443 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10446 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10447 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10448 (long) (sections.line_size ? sections.line_offset : 0),
10449 (long) (sections.loc_size ? sections.loc_offset : 0),
10450 (long) (sections.str_offsets_size
10451 ? sections.str_offsets_offset : 0));
10452 make_cleanup (xfree, virtual_dwo_name);
10453 /* Can we use an existing virtual DWO file? */
10454 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10455 /* Create one if necessary. */
10456 if (*dwo_file_slot == NULL)
10458 if (dwarf_read_debug)
10460 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10463 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10465 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10467 strlen (virtual_dwo_name));
10468 dwo_file->comp_dir = comp_dir;
10469 dwo_file->sections.abbrev =
10470 create_dwp_v2_section (&dwp_file->sections.abbrev,
10471 sections.abbrev_offset, sections.abbrev_size);
10472 dwo_file->sections.line =
10473 create_dwp_v2_section (&dwp_file->sections.line,
10474 sections.line_offset, sections.line_size);
10475 dwo_file->sections.loc =
10476 create_dwp_v2_section (&dwp_file->sections.loc,
10477 sections.loc_offset, sections.loc_size);
10478 dwo_file->sections.macinfo =
10479 create_dwp_v2_section (&dwp_file->sections.macinfo,
10480 sections.macinfo_offset, sections.macinfo_size);
10481 dwo_file->sections.macro =
10482 create_dwp_v2_section (&dwp_file->sections.macro,
10483 sections.macro_offset, sections.macro_size);
10484 dwo_file->sections.str_offsets =
10485 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10486 sections.str_offsets_offset,
10487 sections.str_offsets_size);
10488 /* The "str" section is global to the entire DWP file. */
10489 dwo_file->sections.str = dwp_file->sections.str;
10490 /* The info or types section is assigned below to dwo_unit,
10491 there's no need to record it in dwo_file.
10492 Also, we can't simply record type sections in dwo_file because
10493 we record a pointer into the vector in dwo_unit. As we collect more
10494 types we'll grow the vector and eventually have to reallocate space
10495 for it, invalidating all copies of pointers into the previous
10497 *dwo_file_slot = dwo_file;
10501 if (dwarf_read_debug)
10503 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10506 dwo_file = (struct dwo_file *) *dwo_file_slot;
10508 do_cleanups (cleanups);
10510 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10511 dwo_unit->dwo_file = dwo_file;
10512 dwo_unit->signature = signature;
10513 dwo_unit->section =
10514 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10515 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10516 ? &dwp_file->sections.types
10517 : &dwp_file->sections.info,
10518 sections.info_or_types_offset,
10519 sections.info_or_types_size);
10520 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10525 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10526 Returns NULL if the signature isn't found. */
10528 static struct dwo_unit *
10529 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10530 ULONGEST signature, int is_debug_types)
10532 const struct dwp_hash_table *dwp_htab =
10533 is_debug_types ? dwp_file->tus : dwp_file->cus;
10534 bfd *dbfd = dwp_file->dbfd;
10535 uint32_t mask = dwp_htab->nr_slots - 1;
10536 uint32_t hash = signature & mask;
10537 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10540 struct dwo_unit find_dwo_cu;
10542 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10543 find_dwo_cu.signature = signature;
10544 slot = htab_find_slot (is_debug_types
10545 ? dwp_file->loaded_tus
10546 : dwp_file->loaded_cus,
10547 &find_dwo_cu, INSERT);
10550 return (struct dwo_unit *) *slot;
10552 /* Use a for loop so that we don't loop forever on bad debug info. */
10553 for (i = 0; i < dwp_htab->nr_slots; ++i)
10555 ULONGEST signature_in_table;
10557 signature_in_table =
10558 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10559 if (signature_in_table == signature)
10561 uint32_t unit_index =
10562 read_4_bytes (dbfd,
10563 dwp_htab->unit_table + hash * sizeof (uint32_t));
10565 if (dwp_file->version == 1)
10567 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10568 comp_dir, signature,
10573 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10574 comp_dir, signature,
10577 return (struct dwo_unit *) *slot;
10579 if (signature_in_table == 0)
10581 hash = (hash + hash2) & mask;
10584 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10585 " [in module %s]"),
10589 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10590 Open the file specified by FILE_NAME and hand it off to BFD for
10591 preliminary analysis. Return a newly initialized bfd *, which
10592 includes a canonicalized copy of FILE_NAME.
10593 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10594 SEARCH_CWD is true if the current directory is to be searched.
10595 It will be searched before debug-file-directory.
10596 If successful, the file is added to the bfd include table of the
10597 objfile's bfd (see gdb_bfd_record_inclusion).
10598 If unable to find/open the file, return NULL.
10599 NOTE: This function is derived from symfile_bfd_open. */
10601 static gdb_bfd_ref_ptr
10602 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10605 char *absolute_name;
10606 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10607 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10608 to debug_file_directory. */
10610 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10614 if (*debug_file_directory != '\0')
10615 search_path = concat (".", dirname_separator_string,
10616 debug_file_directory, (char *) NULL);
10618 search_path = xstrdup (".");
10621 search_path = xstrdup (debug_file_directory);
10623 flags = OPF_RETURN_REALPATH;
10625 flags |= OPF_SEARCH_IN_PATH;
10626 desc = openp (search_path, flags, file_name,
10627 O_RDONLY | O_BINARY, &absolute_name);
10628 xfree (search_path);
10632 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
10633 xfree (absolute_name);
10634 if (sym_bfd == NULL)
10636 bfd_set_cacheable (sym_bfd.get (), 1);
10638 if (!bfd_check_format (sym_bfd.get (), bfd_object))
10641 /* Success. Record the bfd as having been included by the objfile's bfd.
10642 This is important because things like demangled_names_hash lives in the
10643 objfile's per_bfd space and may have references to things like symbol
10644 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10645 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
10650 /* Try to open DWO file FILE_NAME.
10651 COMP_DIR is the DW_AT_comp_dir attribute.
10652 The result is the bfd handle of the file.
10653 If there is a problem finding or opening the file, return NULL.
10654 Upon success, the canonicalized path of the file is stored in the bfd,
10655 same as symfile_bfd_open. */
10657 static gdb_bfd_ref_ptr
10658 open_dwo_file (const char *file_name, const char *comp_dir)
10660 if (IS_ABSOLUTE_PATH (file_name))
10661 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10663 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10665 if (comp_dir != NULL)
10667 char *path_to_try = concat (comp_dir, SLASH_STRING,
10668 file_name, (char *) NULL);
10670 /* NOTE: If comp_dir is a relative path, this will also try the
10671 search path, which seems useful. */
10672 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
10673 1 /*search_cwd*/));
10674 xfree (path_to_try);
10679 /* That didn't work, try debug-file-directory, which, despite its name,
10680 is a list of paths. */
10682 if (*debug_file_directory == '\0')
10685 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10688 /* This function is mapped across the sections and remembers the offset and
10689 size of each of the DWO debugging sections we are interested in. */
10692 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10694 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10695 const struct dwop_section_names *names = &dwop_section_names;
10697 if (section_is_p (sectp->name, &names->abbrev_dwo))
10699 dwo_sections->abbrev.s.section = sectp;
10700 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10702 else if (section_is_p (sectp->name, &names->info_dwo))
10704 dwo_sections->info.s.section = sectp;
10705 dwo_sections->info.size = bfd_get_section_size (sectp);
10707 else if (section_is_p (sectp->name, &names->line_dwo))
10709 dwo_sections->line.s.section = sectp;
10710 dwo_sections->line.size = bfd_get_section_size (sectp);
10712 else if (section_is_p (sectp->name, &names->loc_dwo))
10714 dwo_sections->loc.s.section = sectp;
10715 dwo_sections->loc.size = bfd_get_section_size (sectp);
10717 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10719 dwo_sections->macinfo.s.section = sectp;
10720 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10722 else if (section_is_p (sectp->name, &names->macro_dwo))
10724 dwo_sections->macro.s.section = sectp;
10725 dwo_sections->macro.size = bfd_get_section_size (sectp);
10727 else if (section_is_p (sectp->name, &names->str_dwo))
10729 dwo_sections->str.s.section = sectp;
10730 dwo_sections->str.size = bfd_get_section_size (sectp);
10732 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10734 dwo_sections->str_offsets.s.section = sectp;
10735 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10737 else if (section_is_p (sectp->name, &names->types_dwo))
10739 struct dwarf2_section_info type_section;
10741 memset (&type_section, 0, sizeof (type_section));
10742 type_section.s.section = sectp;
10743 type_section.size = bfd_get_section_size (sectp);
10744 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10749 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10750 by PER_CU. This is for the non-DWP case.
10751 The result is NULL if DWO_NAME can't be found. */
10753 static struct dwo_file *
10754 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10755 const char *dwo_name, const char *comp_dir)
10757 struct objfile *objfile = dwarf2_per_objfile->objfile;
10758 struct dwo_file *dwo_file;
10759 struct cleanup *cleanups;
10761 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
10764 if (dwarf_read_debug)
10765 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10768 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10769 dwo_file->dwo_name = dwo_name;
10770 dwo_file->comp_dir = comp_dir;
10771 dwo_file->dbfd = dbfd.release ();
10773 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10775 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
10776 &dwo_file->sections);
10778 dwo_file->cu = create_dwo_cu (dwo_file);
10780 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
10783 discard_cleanups (cleanups);
10785 if (dwarf_read_debug)
10786 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10791 /* This function is mapped across the sections and remembers the offset and
10792 size of each of the DWP debugging sections common to version 1 and 2 that
10793 we are interested in. */
10796 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10797 void *dwp_file_ptr)
10799 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10800 const struct dwop_section_names *names = &dwop_section_names;
10801 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10803 /* Record the ELF section number for later lookup: this is what the
10804 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10805 gdb_assert (elf_section_nr < dwp_file->num_sections);
10806 dwp_file->elf_sections[elf_section_nr] = sectp;
10808 /* Look for specific sections that we need. */
10809 if (section_is_p (sectp->name, &names->str_dwo))
10811 dwp_file->sections.str.s.section = sectp;
10812 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10814 else if (section_is_p (sectp->name, &names->cu_index))
10816 dwp_file->sections.cu_index.s.section = sectp;
10817 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10819 else if (section_is_p (sectp->name, &names->tu_index))
10821 dwp_file->sections.tu_index.s.section = sectp;
10822 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10826 /* This function is mapped across the sections and remembers the offset and
10827 size of each of the DWP version 2 debugging sections that we are interested
10828 in. This is split into a separate function because we don't know if we
10829 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10832 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10834 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10835 const struct dwop_section_names *names = &dwop_section_names;
10836 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10838 /* Record the ELF section number for later lookup: this is what the
10839 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10840 gdb_assert (elf_section_nr < dwp_file->num_sections);
10841 dwp_file->elf_sections[elf_section_nr] = sectp;
10843 /* Look for specific sections that we need. */
10844 if (section_is_p (sectp->name, &names->abbrev_dwo))
10846 dwp_file->sections.abbrev.s.section = sectp;
10847 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
10849 else if (section_is_p (sectp->name, &names->info_dwo))
10851 dwp_file->sections.info.s.section = sectp;
10852 dwp_file->sections.info.size = bfd_get_section_size (sectp);
10854 else if (section_is_p (sectp->name, &names->line_dwo))
10856 dwp_file->sections.line.s.section = sectp;
10857 dwp_file->sections.line.size = bfd_get_section_size (sectp);
10859 else if (section_is_p (sectp->name, &names->loc_dwo))
10861 dwp_file->sections.loc.s.section = sectp;
10862 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
10864 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10866 dwp_file->sections.macinfo.s.section = sectp;
10867 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
10869 else if (section_is_p (sectp->name, &names->macro_dwo))
10871 dwp_file->sections.macro.s.section = sectp;
10872 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
10874 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10876 dwp_file->sections.str_offsets.s.section = sectp;
10877 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
10879 else if (section_is_p (sectp->name, &names->types_dwo))
10881 dwp_file->sections.types.s.section = sectp;
10882 dwp_file->sections.types.size = bfd_get_section_size (sectp);
10886 /* Hash function for dwp_file loaded CUs/TUs. */
10889 hash_dwp_loaded_cutus (const void *item)
10891 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
10893 /* This drops the top 32 bits of the signature, but is ok for a hash. */
10894 return dwo_unit->signature;
10897 /* Equality function for dwp_file loaded CUs/TUs. */
10900 eq_dwp_loaded_cutus (const void *a, const void *b)
10902 const struct dwo_unit *dua = (const struct dwo_unit *) a;
10903 const struct dwo_unit *dub = (const struct dwo_unit *) b;
10905 return dua->signature == dub->signature;
10908 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
10911 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
10913 return htab_create_alloc_ex (3,
10914 hash_dwp_loaded_cutus,
10915 eq_dwp_loaded_cutus,
10917 &objfile->objfile_obstack,
10918 hashtab_obstack_allocate,
10919 dummy_obstack_deallocate);
10922 /* Try to open DWP file FILE_NAME.
10923 The result is the bfd handle of the file.
10924 If there is a problem finding or opening the file, return NULL.
10925 Upon success, the canonicalized path of the file is stored in the bfd,
10926 same as symfile_bfd_open. */
10928 static gdb_bfd_ref_ptr
10929 open_dwp_file (const char *file_name)
10931 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
10932 1 /*search_cwd*/));
10936 /* Work around upstream bug 15652.
10937 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
10938 [Whether that's a "bug" is debatable, but it is getting in our way.]
10939 We have no real idea where the dwp file is, because gdb's realpath-ing
10940 of the executable's path may have discarded the needed info.
10941 [IWBN if the dwp file name was recorded in the executable, akin to
10942 .gnu_debuglink, but that doesn't exist yet.]
10943 Strip the directory from FILE_NAME and search again. */
10944 if (*debug_file_directory != '\0')
10946 /* Don't implicitly search the current directory here.
10947 If the user wants to search "." to handle this case,
10948 it must be added to debug-file-directory. */
10949 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
10956 /* Initialize the use of the DWP file for the current objfile.
10957 By convention the name of the DWP file is ${objfile}.dwp.
10958 The result is NULL if it can't be found. */
10960 static struct dwp_file *
10961 open_and_init_dwp_file (void)
10963 struct objfile *objfile = dwarf2_per_objfile->objfile;
10964 struct dwp_file *dwp_file;
10966 /* Try to find first .dwp for the binary file before any symbolic links
10969 /* If the objfile is a debug file, find the name of the real binary
10970 file and get the name of dwp file from there. */
10971 std::string dwp_name;
10972 if (objfile->separate_debug_objfile_backlink != NULL)
10974 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
10975 const char *backlink_basename = lbasename (backlink->original_name);
10977 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
10980 dwp_name = objfile->original_name;
10982 dwp_name += ".dwp";
10984 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
10986 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
10988 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
10989 dwp_name = objfile_name (objfile);
10990 dwp_name += ".dwp";
10991 dbfd = open_dwp_file (dwp_name.c_str ());
10996 if (dwarf_read_debug)
10997 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11000 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11001 dwp_file->name = bfd_get_filename (dbfd.get ());
11002 dwp_file->dbfd = dbfd.release ();
11004 /* +1: section 0 is unused */
11005 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11006 dwp_file->elf_sections =
11007 OBSTACK_CALLOC (&objfile->objfile_obstack,
11008 dwp_file->num_sections, asection *);
11010 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11013 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11015 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11017 /* The DWP file version is stored in the hash table. Oh well. */
11018 if (dwp_file->cus->version != dwp_file->tus->version)
11020 /* Technically speaking, we should try to limp along, but this is
11021 pretty bizarre. We use pulongest here because that's the established
11022 portability solution (e.g, we cannot use %u for uint32_t). */
11023 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11024 " TU version %s [in DWP file %s]"),
11025 pulongest (dwp_file->cus->version),
11026 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11028 dwp_file->version = dwp_file->cus->version;
11030 if (dwp_file->version == 2)
11031 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11034 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11035 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11037 if (dwarf_read_debug)
11039 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11040 fprintf_unfiltered (gdb_stdlog,
11041 " %s CUs, %s TUs\n",
11042 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11043 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11049 /* Wrapper around open_and_init_dwp_file, only open it once. */
11051 static struct dwp_file *
11052 get_dwp_file (void)
11054 if (! dwarf2_per_objfile->dwp_checked)
11056 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11057 dwarf2_per_objfile->dwp_checked = 1;
11059 return dwarf2_per_objfile->dwp_file;
11062 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11063 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11064 or in the DWP file for the objfile, referenced by THIS_UNIT.
11065 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11066 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11068 This is called, for example, when wanting to read a variable with a
11069 complex location. Therefore we don't want to do file i/o for every call.
11070 Therefore we don't want to look for a DWO file on every call.
11071 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11072 then we check if we've already seen DWO_NAME, and only THEN do we check
11075 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11076 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11078 static struct dwo_unit *
11079 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11080 const char *dwo_name, const char *comp_dir,
11081 ULONGEST signature, int is_debug_types)
11083 struct objfile *objfile = dwarf2_per_objfile->objfile;
11084 const char *kind = is_debug_types ? "TU" : "CU";
11085 void **dwo_file_slot;
11086 struct dwo_file *dwo_file;
11087 struct dwp_file *dwp_file;
11089 /* First see if there's a DWP file.
11090 If we have a DWP file but didn't find the DWO inside it, don't
11091 look for the original DWO file. It makes gdb behave differently
11092 depending on whether one is debugging in the build tree. */
11094 dwp_file = get_dwp_file ();
11095 if (dwp_file != NULL)
11097 const struct dwp_hash_table *dwp_htab =
11098 is_debug_types ? dwp_file->tus : dwp_file->cus;
11100 if (dwp_htab != NULL)
11102 struct dwo_unit *dwo_cutu =
11103 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11104 signature, is_debug_types);
11106 if (dwo_cutu != NULL)
11108 if (dwarf_read_debug)
11110 fprintf_unfiltered (gdb_stdlog,
11111 "Virtual DWO %s %s found: @%s\n",
11112 kind, hex_string (signature),
11113 host_address_to_string (dwo_cutu));
11121 /* No DWP file, look for the DWO file. */
11123 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11124 if (*dwo_file_slot == NULL)
11126 /* Read in the file and build a table of the CUs/TUs it contains. */
11127 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11129 /* NOTE: This will be NULL if unable to open the file. */
11130 dwo_file = (struct dwo_file *) *dwo_file_slot;
11132 if (dwo_file != NULL)
11134 struct dwo_unit *dwo_cutu = NULL;
11136 if (is_debug_types && dwo_file->tus)
11138 struct dwo_unit find_dwo_cutu;
11140 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11141 find_dwo_cutu.signature = signature;
11143 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11145 else if (!is_debug_types && dwo_file->cu)
11147 if (signature == dwo_file->cu->signature)
11148 dwo_cutu = dwo_file->cu;
11151 if (dwo_cutu != NULL)
11153 if (dwarf_read_debug)
11155 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11156 kind, dwo_name, hex_string (signature),
11157 host_address_to_string (dwo_cutu));
11164 /* We didn't find it. This could mean a dwo_id mismatch, or
11165 someone deleted the DWO/DWP file, or the search path isn't set up
11166 correctly to find the file. */
11168 if (dwarf_read_debug)
11170 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11171 kind, dwo_name, hex_string (signature));
11174 /* This is a warning and not a complaint because it can be caused by
11175 pilot error (e.g., user accidentally deleting the DWO). */
11177 /* Print the name of the DWP file if we looked there, helps the user
11178 better diagnose the problem. */
11179 char *dwp_text = NULL;
11180 struct cleanup *cleanups;
11182 if (dwp_file != NULL)
11183 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11184 cleanups = make_cleanup (xfree, dwp_text);
11186 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11187 " [in module %s]"),
11188 kind, dwo_name, hex_string (signature),
11189 dwp_text != NULL ? dwp_text : "",
11190 this_unit->is_debug_types ? "TU" : "CU",
11191 to_underlying (this_unit->sect_off), objfile_name (objfile));
11193 do_cleanups (cleanups);
11198 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11199 See lookup_dwo_cutu_unit for details. */
11201 static struct dwo_unit *
11202 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11203 const char *dwo_name, const char *comp_dir,
11204 ULONGEST signature)
11206 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11209 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11210 See lookup_dwo_cutu_unit for details. */
11212 static struct dwo_unit *
11213 lookup_dwo_type_unit (struct signatured_type *this_tu,
11214 const char *dwo_name, const char *comp_dir)
11216 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11219 /* Traversal function for queue_and_load_all_dwo_tus. */
11222 queue_and_load_dwo_tu (void **slot, void *info)
11224 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11225 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11226 ULONGEST signature = dwo_unit->signature;
11227 struct signatured_type *sig_type =
11228 lookup_dwo_signatured_type (per_cu->cu, signature);
11230 if (sig_type != NULL)
11232 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11234 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11235 a real dependency of PER_CU on SIG_TYPE. That is detected later
11236 while processing PER_CU. */
11237 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11238 load_full_type_unit (sig_cu);
11239 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11245 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11246 The DWO may have the only definition of the type, though it may not be
11247 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11248 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11251 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11253 struct dwo_unit *dwo_unit;
11254 struct dwo_file *dwo_file;
11256 gdb_assert (!per_cu->is_debug_types);
11257 gdb_assert (get_dwp_file () == NULL);
11258 gdb_assert (per_cu->cu != NULL);
11260 dwo_unit = per_cu->cu->dwo_unit;
11261 gdb_assert (dwo_unit != NULL);
11263 dwo_file = dwo_unit->dwo_file;
11264 if (dwo_file->tus != NULL)
11265 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11268 /* Free all resources associated with DWO_FILE.
11269 Close the DWO file and munmap the sections.
11270 All memory should be on the objfile obstack. */
11273 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11276 /* Note: dbfd is NULL for virtual DWO files. */
11277 gdb_bfd_unref (dwo_file->dbfd);
11279 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11282 /* Wrapper for free_dwo_file for use in cleanups. */
11285 free_dwo_file_cleanup (void *arg)
11287 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11288 struct objfile *objfile = dwarf2_per_objfile->objfile;
11290 free_dwo_file (dwo_file, objfile);
11293 /* Traversal function for free_dwo_files. */
11296 free_dwo_file_from_slot (void **slot, void *info)
11298 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11299 struct objfile *objfile = (struct objfile *) info;
11301 free_dwo_file (dwo_file, objfile);
11306 /* Free all resources associated with DWO_FILES. */
11309 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11311 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11314 /* Read in various DIEs. */
11316 /* qsort helper for inherit_abstract_dies. */
11319 unsigned_int_compar (const void *ap, const void *bp)
11321 unsigned int a = *(unsigned int *) ap;
11322 unsigned int b = *(unsigned int *) bp;
11324 return (a > b) - (b > a);
11327 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11328 Inherit only the children of the DW_AT_abstract_origin DIE not being
11329 already referenced by DW_AT_abstract_origin from the children of the
11333 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11335 struct die_info *child_die;
11336 unsigned die_children_count;
11337 /* CU offsets which were referenced by children of the current DIE. */
11338 sect_offset *offsets;
11339 sect_offset *offsets_end, *offsetp;
11340 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11341 struct die_info *origin_die;
11342 /* Iterator of the ORIGIN_DIE children. */
11343 struct die_info *origin_child_die;
11344 struct cleanup *cleanups;
11345 struct attribute *attr;
11346 struct dwarf2_cu *origin_cu;
11347 struct pending **origin_previous_list_in_scope;
11349 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11353 /* Note that following die references may follow to a die in a
11357 origin_die = follow_die_ref (die, attr, &origin_cu);
11359 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11361 origin_previous_list_in_scope = origin_cu->list_in_scope;
11362 origin_cu->list_in_scope = cu->list_in_scope;
11364 if (die->tag != origin_die->tag
11365 && !(die->tag == DW_TAG_inlined_subroutine
11366 && origin_die->tag == DW_TAG_subprogram))
11367 complaint (&symfile_complaints,
11368 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11369 to_underlying (die->sect_off),
11370 to_underlying (origin_die->sect_off));
11372 child_die = die->child;
11373 die_children_count = 0;
11374 while (child_die && child_die->tag)
11376 child_die = sibling_die (child_die);
11377 die_children_count++;
11379 offsets = XNEWVEC (sect_offset, die_children_count);
11380 cleanups = make_cleanup (xfree, offsets);
11382 offsets_end = offsets;
11383 for (child_die = die->child;
11384 child_die && child_die->tag;
11385 child_die = sibling_die (child_die))
11387 struct die_info *child_origin_die;
11388 struct dwarf2_cu *child_origin_cu;
11390 /* We are trying to process concrete instance entries:
11391 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11392 it's not relevant to our analysis here. i.e. detecting DIEs that are
11393 present in the abstract instance but not referenced in the concrete
11395 if (child_die->tag == DW_TAG_call_site
11396 || child_die->tag == DW_TAG_GNU_call_site)
11399 /* For each CHILD_DIE, find the corresponding child of
11400 ORIGIN_DIE. If there is more than one layer of
11401 DW_AT_abstract_origin, follow them all; there shouldn't be,
11402 but GCC versions at least through 4.4 generate this (GCC PR
11404 child_origin_die = child_die;
11405 child_origin_cu = cu;
11408 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11412 child_origin_die = follow_die_ref (child_origin_die, attr,
11416 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11417 counterpart may exist. */
11418 if (child_origin_die != child_die)
11420 if (child_die->tag != child_origin_die->tag
11421 && !(child_die->tag == DW_TAG_inlined_subroutine
11422 && child_origin_die->tag == DW_TAG_subprogram))
11423 complaint (&symfile_complaints,
11424 _("Child DIE 0x%x and its abstract origin 0x%x have "
11426 to_underlying (child_die->sect_off),
11427 to_underlying (child_origin_die->sect_off));
11428 if (child_origin_die->parent != origin_die)
11429 complaint (&symfile_complaints,
11430 _("Child DIE 0x%x and its abstract origin 0x%x have "
11431 "different parents"),
11432 to_underlying (child_die->sect_off),
11433 to_underlying (child_origin_die->sect_off));
11435 *offsets_end++ = child_origin_die->sect_off;
11438 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11439 unsigned_int_compar);
11440 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11441 if (offsetp[-1] == *offsetp)
11442 complaint (&symfile_complaints,
11443 _("Multiple children of DIE 0x%x refer "
11444 "to DIE 0x%x as their abstract origin"),
11445 to_underlying (die->sect_off), to_underlying (*offsetp));
11448 origin_child_die = origin_die->child;
11449 while (origin_child_die && origin_child_die->tag)
11451 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11452 while (offsetp < offsets_end
11453 && *offsetp < origin_child_die->sect_off)
11455 if (offsetp >= offsets_end
11456 || *offsetp > origin_child_die->sect_off)
11458 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11459 Check whether we're already processing ORIGIN_CHILD_DIE.
11460 This can happen with mutually referenced abstract_origins.
11462 if (!origin_child_die->in_process)
11463 process_die (origin_child_die, origin_cu);
11465 origin_child_die = sibling_die (origin_child_die);
11467 origin_cu->list_in_scope = origin_previous_list_in_scope;
11469 do_cleanups (cleanups);
11473 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11475 struct objfile *objfile = cu->objfile;
11476 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11477 struct context_stack *newobj;
11480 struct die_info *child_die;
11481 struct attribute *attr, *call_line, *call_file;
11483 CORE_ADDR baseaddr;
11484 struct block *block;
11485 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11486 VEC (symbolp) *template_args = NULL;
11487 struct template_symbol *templ_func = NULL;
11491 /* If we do not have call site information, we can't show the
11492 caller of this inlined function. That's too confusing, so
11493 only use the scope for local variables. */
11494 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11495 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11496 if (call_line == NULL || call_file == NULL)
11498 read_lexical_block_scope (die, cu);
11503 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11505 name = dwarf2_name (die, cu);
11507 /* Ignore functions with missing or empty names. These are actually
11508 illegal according to the DWARF standard. */
11511 complaint (&symfile_complaints,
11512 _("missing name for subprogram DIE at %d"),
11513 to_underlying (die->sect_off));
11517 /* Ignore functions with missing or invalid low and high pc attributes. */
11518 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11519 <= PC_BOUNDS_INVALID)
11521 attr = dwarf2_attr (die, DW_AT_external, cu);
11522 if (!attr || !DW_UNSND (attr))
11523 complaint (&symfile_complaints,
11524 _("cannot get low and high bounds "
11525 "for subprogram DIE at %d"),
11526 to_underlying (die->sect_off));
11530 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11531 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11533 /* If we have any template arguments, then we must allocate a
11534 different sort of symbol. */
11535 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11537 if (child_die->tag == DW_TAG_template_type_param
11538 || child_die->tag == DW_TAG_template_value_param)
11540 templ_func = allocate_template_symbol (objfile);
11541 templ_func->base.is_cplus_template_function = 1;
11546 newobj = push_context (0, lowpc);
11547 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11548 (struct symbol *) templ_func);
11550 /* If there is a location expression for DW_AT_frame_base, record
11552 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11554 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11556 /* If there is a location for the static link, record it. */
11557 newobj->static_link = NULL;
11558 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11561 newobj->static_link
11562 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11563 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11566 cu->list_in_scope = &local_symbols;
11568 if (die->child != NULL)
11570 child_die = die->child;
11571 while (child_die && child_die->tag)
11573 if (child_die->tag == DW_TAG_template_type_param
11574 || child_die->tag == DW_TAG_template_value_param)
11576 struct symbol *arg = new_symbol (child_die, NULL, cu);
11579 VEC_safe_push (symbolp, template_args, arg);
11582 process_die (child_die, cu);
11583 child_die = sibling_die (child_die);
11587 inherit_abstract_dies (die, cu);
11589 /* If we have a DW_AT_specification, we might need to import using
11590 directives from the context of the specification DIE. See the
11591 comment in determine_prefix. */
11592 if (cu->language == language_cplus
11593 && dwarf2_attr (die, DW_AT_specification, cu))
11595 struct dwarf2_cu *spec_cu = cu;
11596 struct die_info *spec_die = die_specification (die, &spec_cu);
11600 child_die = spec_die->child;
11601 while (child_die && child_die->tag)
11603 if (child_die->tag == DW_TAG_imported_module)
11604 process_die (child_die, spec_cu);
11605 child_die = sibling_die (child_die);
11608 /* In some cases, GCC generates specification DIEs that
11609 themselves contain DW_AT_specification attributes. */
11610 spec_die = die_specification (spec_die, &spec_cu);
11614 newobj = pop_context ();
11615 /* Make a block for the local symbols within. */
11616 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11617 newobj->static_link, lowpc, highpc);
11619 /* For C++, set the block's scope. */
11620 if ((cu->language == language_cplus
11621 || cu->language == language_fortran
11622 || cu->language == language_d
11623 || cu->language == language_rust)
11624 && cu->processing_has_namespace_info)
11625 block_set_scope (block, determine_prefix (die, cu),
11626 &objfile->objfile_obstack);
11628 /* If we have address ranges, record them. */
11629 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11631 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11633 /* Attach template arguments to function. */
11634 if (! VEC_empty (symbolp, template_args))
11636 gdb_assert (templ_func != NULL);
11638 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11639 templ_func->template_arguments
11640 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11641 templ_func->n_template_arguments);
11642 memcpy (templ_func->template_arguments,
11643 VEC_address (symbolp, template_args),
11644 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11645 VEC_free (symbolp, template_args);
11648 /* In C++, we can have functions nested inside functions (e.g., when
11649 a function declares a class that has methods). This means that
11650 when we finish processing a function scope, we may need to go
11651 back to building a containing block's symbol lists. */
11652 local_symbols = newobj->locals;
11653 local_using_directives = newobj->local_using_directives;
11655 /* If we've finished processing a top-level function, subsequent
11656 symbols go in the file symbol list. */
11657 if (outermost_context_p ())
11658 cu->list_in_scope = &file_symbols;
11661 /* Process all the DIES contained within a lexical block scope. Start
11662 a new scope, process the dies, and then close the scope. */
11665 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11667 struct objfile *objfile = cu->objfile;
11668 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11669 struct context_stack *newobj;
11670 CORE_ADDR lowpc, highpc;
11671 struct die_info *child_die;
11672 CORE_ADDR baseaddr;
11674 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11676 /* Ignore blocks with missing or invalid low and high pc attributes. */
11677 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11678 as multiple lexical blocks? Handling children in a sane way would
11679 be nasty. Might be easier to properly extend generic blocks to
11680 describe ranges. */
11681 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11683 case PC_BOUNDS_NOT_PRESENT:
11684 /* DW_TAG_lexical_block has no attributes, process its children as if
11685 there was no wrapping by that DW_TAG_lexical_block.
11686 GCC does no longer produces such DWARF since GCC r224161. */
11687 for (child_die = die->child;
11688 child_die != NULL && child_die->tag;
11689 child_die = sibling_die (child_die))
11690 process_die (child_die, cu);
11692 case PC_BOUNDS_INVALID:
11695 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11696 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11698 push_context (0, lowpc);
11699 if (die->child != NULL)
11701 child_die = die->child;
11702 while (child_die && child_die->tag)
11704 process_die (child_die, cu);
11705 child_die = sibling_die (child_die);
11708 inherit_abstract_dies (die, cu);
11709 newobj = pop_context ();
11711 if (local_symbols != NULL || local_using_directives != NULL)
11713 struct block *block
11714 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11715 newobj->start_addr, highpc);
11717 /* Note that recording ranges after traversing children, as we
11718 do here, means that recording a parent's ranges entails
11719 walking across all its children's ranges as they appear in
11720 the address map, which is quadratic behavior.
11722 It would be nicer to record the parent's ranges before
11723 traversing its children, simply overriding whatever you find
11724 there. But since we don't even decide whether to create a
11725 block until after we've traversed its children, that's hard
11727 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11729 local_symbols = newobj->locals;
11730 local_using_directives = newobj->local_using_directives;
11733 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
11736 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11738 struct objfile *objfile = cu->objfile;
11739 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11740 CORE_ADDR pc, baseaddr;
11741 struct attribute *attr;
11742 struct call_site *call_site, call_site_local;
11745 struct die_info *child_die;
11747 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11749 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
11752 /* This was a pre-DWARF-5 GNU extension alias
11753 for DW_AT_call_return_pc. */
11754 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11758 complaint (&symfile_complaints,
11759 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
11760 "DIE 0x%x [in module %s]"),
11761 to_underlying (die->sect_off), objfile_name (objfile));
11764 pc = attr_value_as_address (attr) + baseaddr;
11765 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11767 if (cu->call_site_htab == NULL)
11768 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11769 NULL, &objfile->objfile_obstack,
11770 hashtab_obstack_allocate, NULL);
11771 call_site_local.pc = pc;
11772 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11775 complaint (&symfile_complaints,
11776 _("Duplicate PC %s for DW_TAG_call_site "
11777 "DIE 0x%x [in module %s]"),
11778 paddress (gdbarch, pc), to_underlying (die->sect_off),
11779 objfile_name (objfile));
11783 /* Count parameters at the caller. */
11786 for (child_die = die->child; child_die && child_die->tag;
11787 child_die = sibling_die (child_die))
11789 if (child_die->tag != DW_TAG_call_site_parameter
11790 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11792 complaint (&symfile_complaints,
11793 _("Tag %d is not DW_TAG_call_site_parameter in "
11794 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11795 child_die->tag, to_underlying (child_die->sect_off),
11796 objfile_name (objfile));
11804 = ((struct call_site *)
11805 obstack_alloc (&objfile->objfile_obstack,
11806 sizeof (*call_site)
11807 + (sizeof (*call_site->parameter) * (nparams - 1))));
11809 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11810 call_site->pc = pc;
11812 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
11813 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11815 struct die_info *func_die;
11817 /* Skip also over DW_TAG_inlined_subroutine. */
11818 for (func_die = die->parent;
11819 func_die && func_die->tag != DW_TAG_subprogram
11820 && func_die->tag != DW_TAG_subroutine_type;
11821 func_die = func_die->parent);
11823 /* DW_AT_call_all_calls is a superset
11824 of DW_AT_call_all_tail_calls. */
11826 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
11827 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11828 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
11829 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11831 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11832 not complete. But keep CALL_SITE for look ups via call_site_htab,
11833 both the initial caller containing the real return address PC and
11834 the final callee containing the current PC of a chain of tail
11835 calls do not need to have the tail call list complete. But any
11836 function candidate for a virtual tail call frame searched via
11837 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11838 determined unambiguously. */
11842 struct type *func_type = NULL;
11845 func_type = get_die_type (func_die, cu);
11846 if (func_type != NULL)
11848 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
11850 /* Enlist this call site to the function. */
11851 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
11852 TYPE_TAIL_CALL_LIST (func_type) = call_site;
11855 complaint (&symfile_complaints,
11856 _("Cannot find function owning DW_TAG_call_site "
11857 "DIE 0x%x [in module %s]"),
11858 to_underlying (die->sect_off), objfile_name (objfile));
11862 attr = dwarf2_attr (die, DW_AT_call_target, cu);
11864 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
11866 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
11869 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
11870 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11872 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
11873 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
11874 /* Keep NULL DWARF_BLOCK. */;
11875 else if (attr_form_is_block (attr))
11877 struct dwarf2_locexpr_baton *dlbaton;
11879 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
11880 dlbaton->data = DW_BLOCK (attr)->data;
11881 dlbaton->size = DW_BLOCK (attr)->size;
11882 dlbaton->per_cu = cu->per_cu;
11884 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
11886 else if (attr_form_is_ref (attr))
11888 struct dwarf2_cu *target_cu = cu;
11889 struct die_info *target_die;
11891 target_die = follow_die_ref (die, attr, &target_cu);
11892 gdb_assert (target_cu->objfile == objfile);
11893 if (die_is_declaration (target_die, target_cu))
11895 const char *target_physname;
11897 /* Prefer the mangled name; otherwise compute the demangled one. */
11898 target_physname = dwarf2_string_attr (target_die,
11899 DW_AT_linkage_name,
11901 if (target_physname == NULL)
11902 target_physname = dwarf2_string_attr (target_die,
11903 DW_AT_MIPS_linkage_name,
11905 if (target_physname == NULL)
11906 target_physname = dwarf2_physname (NULL, target_die, target_cu);
11907 if (target_physname == NULL)
11908 complaint (&symfile_complaints,
11909 _("DW_AT_call_target target DIE has invalid "
11910 "physname, for referencing DIE 0x%x [in module %s]"),
11911 to_underlying (die->sect_off), objfile_name (objfile));
11913 SET_FIELD_PHYSNAME (call_site->target, target_physname);
11919 /* DW_AT_entry_pc should be preferred. */
11920 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
11921 <= PC_BOUNDS_INVALID)
11922 complaint (&symfile_complaints,
11923 _("DW_AT_call_target target DIE has invalid "
11924 "low pc, for referencing DIE 0x%x [in module %s]"),
11925 to_underlying (die->sect_off), objfile_name (objfile));
11928 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11929 SET_FIELD_PHYSADDR (call_site->target, lowpc);
11934 complaint (&symfile_complaints,
11935 _("DW_TAG_call_site DW_AT_call_target is neither "
11936 "block nor reference, for DIE 0x%x [in module %s]"),
11937 to_underlying (die->sect_off), objfile_name (objfile));
11939 call_site->per_cu = cu->per_cu;
11941 for (child_die = die->child;
11942 child_die && child_die->tag;
11943 child_die = sibling_die (child_die))
11945 struct call_site_parameter *parameter;
11946 struct attribute *loc, *origin;
11948 if (child_die->tag != DW_TAG_call_site_parameter
11949 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11951 /* Already printed the complaint above. */
11955 gdb_assert (call_site->parameter_count < nparams);
11956 parameter = &call_site->parameter[call_site->parameter_count];
11958 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
11959 specifies DW_TAG_formal_parameter. Value of the data assumed for the
11960 register is contained in DW_AT_call_value. */
11962 loc = dwarf2_attr (child_die, DW_AT_location, cu);
11963 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
11964 if (origin == NULL)
11966 /* This was a pre-DWARF-5 GNU extension alias
11967 for DW_AT_call_parameter. */
11968 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
11970 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
11972 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
11974 sect_offset sect_off
11975 = (sect_offset) dwarf2_get_ref_die_offset (origin);
11976 if (!offset_in_cu_p (&cu->header, sect_off))
11978 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
11979 binding can be done only inside one CU. Such referenced DIE
11980 therefore cannot be even moved to DW_TAG_partial_unit. */
11981 complaint (&symfile_complaints,
11982 _("DW_AT_call_parameter offset is not in CU for "
11983 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11984 to_underlying (child_die->sect_off),
11985 objfile_name (objfile));
11988 parameter->u.param_cu_off
11989 = (cu_offset) (sect_off - cu->header.sect_off);
11991 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
11993 complaint (&symfile_complaints,
11994 _("No DW_FORM_block* DW_AT_location for "
11995 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11996 to_underlying (child_die->sect_off), objfile_name (objfile));
12001 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12002 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12003 if (parameter->u.dwarf_reg != -1)
12004 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12005 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12006 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12007 ¶meter->u.fb_offset))
12008 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12011 complaint (&symfile_complaints,
12012 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12013 "for DW_FORM_block* DW_AT_location is supported for "
12014 "DW_TAG_call_site child DIE 0x%x "
12016 to_underlying (child_die->sect_off),
12017 objfile_name (objfile));
12022 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12024 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12025 if (!attr_form_is_block (attr))
12027 complaint (&symfile_complaints,
12028 _("No DW_FORM_block* DW_AT_call_value for "
12029 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12030 to_underlying (child_die->sect_off),
12031 objfile_name (objfile));
12034 parameter->value = DW_BLOCK (attr)->data;
12035 parameter->value_size = DW_BLOCK (attr)->size;
12037 /* Parameters are not pre-cleared by memset above. */
12038 parameter->data_value = NULL;
12039 parameter->data_value_size = 0;
12040 call_site->parameter_count++;
12042 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12044 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12047 if (!attr_form_is_block (attr))
12048 complaint (&symfile_complaints,
12049 _("No DW_FORM_block* DW_AT_call_data_value for "
12050 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12051 to_underlying (child_die->sect_off),
12052 objfile_name (objfile));
12055 parameter->data_value = DW_BLOCK (attr)->data;
12056 parameter->data_value_size = DW_BLOCK (attr)->size;
12062 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12063 reading .debug_rnglists.
12064 Callback's type should be:
12065 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12066 Return true if the attributes are present and valid, otherwise,
12069 template <typename Callback>
12071 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12072 Callback &&callback)
12074 struct objfile *objfile = cu->objfile;
12075 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12076 struct comp_unit_head *cu_header = &cu->header;
12077 bfd *obfd = objfile->obfd;
12078 unsigned int addr_size = cu_header->addr_size;
12079 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12080 /* Base address selection entry. */
12083 unsigned int dummy;
12084 const gdb_byte *buffer;
12086 CORE_ADDR high = 0;
12087 CORE_ADDR baseaddr;
12088 bool overflow = false;
12090 found_base = cu->base_known;
12091 base = cu->base_address;
12093 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12094 if (offset >= dwarf2_per_objfile->rnglists.size)
12096 complaint (&symfile_complaints,
12097 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12101 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12103 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12107 /* Initialize it due to a false compiler warning. */
12108 CORE_ADDR range_beginning = 0, range_end = 0;
12109 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12110 + dwarf2_per_objfile->rnglists.size);
12111 unsigned int bytes_read;
12113 if (buffer == buf_end)
12118 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12121 case DW_RLE_end_of_list:
12123 case DW_RLE_base_address:
12124 if (buffer + cu->header.addr_size > buf_end)
12129 base = read_address (obfd, buffer, cu, &bytes_read);
12131 buffer += bytes_read;
12133 case DW_RLE_start_length:
12134 if (buffer + cu->header.addr_size > buf_end)
12139 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12140 buffer += bytes_read;
12141 range_end = (range_beginning
12142 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12143 buffer += bytes_read;
12144 if (buffer > buf_end)
12150 case DW_RLE_offset_pair:
12151 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12152 buffer += bytes_read;
12153 if (buffer > buf_end)
12158 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12159 buffer += bytes_read;
12160 if (buffer > buf_end)
12166 case DW_RLE_start_end:
12167 if (buffer + 2 * cu->header.addr_size > buf_end)
12172 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12173 buffer += bytes_read;
12174 range_end = read_address (obfd, buffer, cu, &bytes_read);
12175 buffer += bytes_read;
12178 complaint (&symfile_complaints,
12179 _("Invalid .debug_rnglists data (no base address)"));
12182 if (rlet == DW_RLE_end_of_list || overflow)
12184 if (rlet == DW_RLE_base_address)
12189 /* We have no valid base address for the ranges
12191 complaint (&symfile_complaints,
12192 _("Invalid .debug_rnglists data (no base address)"));
12196 if (range_beginning > range_end)
12198 /* Inverted range entries are invalid. */
12199 complaint (&symfile_complaints,
12200 _("Invalid .debug_rnglists data (inverted range)"));
12204 /* Empty range entries have no effect. */
12205 if (range_beginning == range_end)
12208 range_beginning += base;
12211 /* A not-uncommon case of bad debug info.
12212 Don't pollute the addrmap with bad data. */
12213 if (range_beginning + baseaddr == 0
12214 && !dwarf2_per_objfile->has_section_at_zero)
12216 complaint (&symfile_complaints,
12217 _(".debug_rnglists entry has start address of zero"
12218 " [in module %s]"), objfile_name (objfile));
12222 callback (range_beginning, range_end);
12227 complaint (&symfile_complaints,
12228 _("Offset %d is not terminated "
12229 "for DW_AT_ranges attribute"),
12237 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
12238 Callback's type should be:
12239 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12240 Return 1 if the attributes are present and valid, otherwise, return 0. */
12242 template <typename Callback>
12244 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
12245 Callback &&callback)
12247 struct objfile *objfile = cu->objfile;
12248 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12249 struct comp_unit_head *cu_header = &cu->header;
12250 bfd *obfd = objfile->obfd;
12251 unsigned int addr_size = cu_header->addr_size;
12252 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12253 /* Base address selection entry. */
12256 unsigned int dummy;
12257 const gdb_byte *buffer;
12258 CORE_ADDR baseaddr;
12260 if (cu_header->version >= 5)
12261 return dwarf2_rnglists_process (offset, cu, callback);
12263 found_base = cu->base_known;
12264 base = cu->base_address;
12266 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12267 if (offset >= dwarf2_per_objfile->ranges.size)
12269 complaint (&symfile_complaints,
12270 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12274 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12276 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12280 CORE_ADDR range_beginning, range_end;
12282 range_beginning = read_address (obfd, buffer, cu, &dummy);
12283 buffer += addr_size;
12284 range_end = read_address (obfd, buffer, cu, &dummy);
12285 buffer += addr_size;
12286 offset += 2 * addr_size;
12288 /* An end of list marker is a pair of zero addresses. */
12289 if (range_beginning == 0 && range_end == 0)
12290 /* Found the end of list entry. */
12293 /* Each base address selection entry is a pair of 2 values.
12294 The first is the largest possible address, the second is
12295 the base address. Check for a base address here. */
12296 if ((range_beginning & mask) == mask)
12298 /* If we found the largest possible address, then we already
12299 have the base address in range_end. */
12307 /* We have no valid base address for the ranges
12309 complaint (&symfile_complaints,
12310 _("Invalid .debug_ranges data (no base address)"));
12314 if (range_beginning > range_end)
12316 /* Inverted range entries are invalid. */
12317 complaint (&symfile_complaints,
12318 _("Invalid .debug_ranges data (inverted range)"));
12322 /* Empty range entries have no effect. */
12323 if (range_beginning == range_end)
12326 range_beginning += base;
12329 /* A not-uncommon case of bad debug info.
12330 Don't pollute the addrmap with bad data. */
12331 if (range_beginning + baseaddr == 0
12332 && !dwarf2_per_objfile->has_section_at_zero)
12334 complaint (&symfile_complaints,
12335 _(".debug_ranges entry has start address of zero"
12336 " [in module %s]"), objfile_name (objfile));
12340 callback (range_beginning, range_end);
12346 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
12347 Return 1 if the attributes are present and valid, otherwise, return 0.
12348 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
12351 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
12352 CORE_ADDR *high_return, struct dwarf2_cu *cu,
12353 struct partial_symtab *ranges_pst)
12355 struct objfile *objfile = cu->objfile;
12356 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12357 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
12358 SECT_OFF_TEXT (objfile));
12361 CORE_ADDR high = 0;
12364 retval = dwarf2_ranges_process (offset, cu,
12365 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
12367 if (ranges_pst != NULL)
12372 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12373 range_beginning + baseaddr);
12374 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12375 range_end + baseaddr);
12376 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12380 /* FIXME: This is recording everything as a low-high
12381 segment of consecutive addresses. We should have a
12382 data structure for discontiguous block ranges
12386 low = range_beginning;
12392 if (range_beginning < low)
12393 low = range_beginning;
12394 if (range_end > high)
12402 /* If the first entry is an end-of-list marker, the range
12403 describes an empty scope, i.e. no instructions. */
12409 *high_return = high;
12413 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12414 definition for the return value. *LOWPC and *HIGHPC are set iff
12415 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12417 static enum pc_bounds_kind
12418 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12419 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12420 struct partial_symtab *pst)
12422 struct attribute *attr;
12423 struct attribute *attr_high;
12425 CORE_ADDR high = 0;
12426 enum pc_bounds_kind ret;
12428 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12431 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12434 low = attr_value_as_address (attr);
12435 high = attr_value_as_address (attr_high);
12436 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12440 /* Found high w/o low attribute. */
12441 return PC_BOUNDS_INVALID;
12443 /* Found consecutive range of addresses. */
12444 ret = PC_BOUNDS_HIGH_LOW;
12448 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12451 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12452 We take advantage of the fact that DW_AT_ranges does not appear
12453 in DW_TAG_compile_unit of DWO files. */
12454 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12455 unsigned int ranges_offset = (DW_UNSND (attr)
12456 + (need_ranges_base
12460 /* Value of the DW_AT_ranges attribute is the offset in the
12461 .debug_ranges section. */
12462 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12463 return PC_BOUNDS_INVALID;
12464 /* Found discontinuous range of addresses. */
12465 ret = PC_BOUNDS_RANGES;
12468 return PC_BOUNDS_NOT_PRESENT;
12471 /* read_partial_die has also the strict LOW < HIGH requirement. */
12473 return PC_BOUNDS_INVALID;
12475 /* When using the GNU linker, .gnu.linkonce. sections are used to
12476 eliminate duplicate copies of functions and vtables and such.
12477 The linker will arbitrarily choose one and discard the others.
12478 The AT_*_pc values for such functions refer to local labels in
12479 these sections. If the section from that file was discarded, the
12480 labels are not in the output, so the relocs get a value of 0.
12481 If this is a discarded function, mark the pc bounds as invalid,
12482 so that GDB will ignore it. */
12483 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12484 return PC_BOUNDS_INVALID;
12492 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12493 its low and high PC addresses. Do nothing if these addresses could not
12494 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12495 and HIGHPC to the high address if greater than HIGHPC. */
12498 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12499 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12500 struct dwarf2_cu *cu)
12502 CORE_ADDR low, high;
12503 struct die_info *child = die->child;
12505 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12507 *lowpc = std::min (*lowpc, low);
12508 *highpc = std::max (*highpc, high);
12511 /* If the language does not allow nested subprograms (either inside
12512 subprograms or lexical blocks), we're done. */
12513 if (cu->language != language_ada)
12516 /* Check all the children of the given DIE. If it contains nested
12517 subprograms, then check their pc bounds. Likewise, we need to
12518 check lexical blocks as well, as they may also contain subprogram
12520 while (child && child->tag)
12522 if (child->tag == DW_TAG_subprogram
12523 || child->tag == DW_TAG_lexical_block)
12524 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12525 child = sibling_die (child);
12529 /* Get the low and high pc's represented by the scope DIE, and store
12530 them in *LOWPC and *HIGHPC. If the correct values can't be
12531 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12534 get_scope_pc_bounds (struct die_info *die,
12535 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12536 struct dwarf2_cu *cu)
12538 CORE_ADDR best_low = (CORE_ADDR) -1;
12539 CORE_ADDR best_high = (CORE_ADDR) 0;
12540 CORE_ADDR current_low, current_high;
12542 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12543 >= PC_BOUNDS_RANGES)
12545 best_low = current_low;
12546 best_high = current_high;
12550 struct die_info *child = die->child;
12552 while (child && child->tag)
12554 switch (child->tag) {
12555 case DW_TAG_subprogram:
12556 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12558 case DW_TAG_namespace:
12559 case DW_TAG_module:
12560 /* FIXME: carlton/2004-01-16: Should we do this for
12561 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12562 that current GCC's always emit the DIEs corresponding
12563 to definitions of methods of classes as children of a
12564 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12565 the DIEs giving the declarations, which could be
12566 anywhere). But I don't see any reason why the
12567 standards says that they have to be there. */
12568 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12570 if (current_low != ((CORE_ADDR) -1))
12572 best_low = std::min (best_low, current_low);
12573 best_high = std::max (best_high, current_high);
12581 child = sibling_die (child);
12586 *highpc = best_high;
12589 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12593 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12594 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12596 struct objfile *objfile = cu->objfile;
12597 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12598 struct attribute *attr;
12599 struct attribute *attr_high;
12601 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12604 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12607 CORE_ADDR low = attr_value_as_address (attr);
12608 CORE_ADDR high = attr_value_as_address (attr_high);
12610 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12613 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12614 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12615 record_block_range (block, low, high - 1);
12619 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12622 bfd *obfd = objfile->obfd;
12623 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12624 We take advantage of the fact that DW_AT_ranges does not appear
12625 in DW_TAG_compile_unit of DWO files. */
12626 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12628 /* The value of the DW_AT_ranges attribute is the offset of the
12629 address range list in the .debug_ranges section. */
12630 unsigned long offset = (DW_UNSND (attr)
12631 + (need_ranges_base ? cu->ranges_base : 0));
12632 const gdb_byte *buffer;
12634 /* For some target architectures, but not others, the
12635 read_address function sign-extends the addresses it returns.
12636 To recognize base address selection entries, we need a
12638 unsigned int addr_size = cu->header.addr_size;
12639 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12641 /* The base address, to which the next pair is relative. Note
12642 that this 'base' is a DWARF concept: most entries in a range
12643 list are relative, to reduce the number of relocs against the
12644 debugging information. This is separate from this function's
12645 'baseaddr' argument, which GDB uses to relocate debugging
12646 information from a shared library based on the address at
12647 which the library was loaded. */
12648 CORE_ADDR base = cu->base_address;
12649 int base_known = cu->base_known;
12651 dwarf2_ranges_process (offset, cu,
12652 [&] (CORE_ADDR start, CORE_ADDR end)
12656 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12657 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12658 record_block_range (block, start, end - 1);
12663 /* Check whether the producer field indicates either of GCC < 4.6, or the
12664 Intel C/C++ compiler, and cache the result in CU. */
12667 check_producer (struct dwarf2_cu *cu)
12671 if (cu->producer == NULL)
12673 /* For unknown compilers expect their behavior is DWARF version
12676 GCC started to support .debug_types sections by -gdwarf-4 since
12677 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12678 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12679 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12680 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12682 else if (producer_is_gcc (cu->producer, &major, &minor))
12684 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12685 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12687 else if (startswith (cu->producer, "Intel(R) C"))
12688 cu->producer_is_icc = 1;
12691 /* For other non-GCC compilers, expect their behavior is DWARF version
12695 cu->checked_producer = 1;
12698 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12699 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12700 during 4.6.0 experimental. */
12703 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12705 if (!cu->checked_producer)
12706 check_producer (cu);
12708 return cu->producer_is_gxx_lt_4_6;
12711 /* Return the default accessibility type if it is not overriden by
12712 DW_AT_accessibility. */
12714 static enum dwarf_access_attribute
12715 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12717 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12719 /* The default DWARF 2 accessibility for members is public, the default
12720 accessibility for inheritance is private. */
12722 if (die->tag != DW_TAG_inheritance)
12723 return DW_ACCESS_public;
12725 return DW_ACCESS_private;
12729 /* DWARF 3+ defines the default accessibility a different way. The same
12730 rules apply now for DW_TAG_inheritance as for the members and it only
12731 depends on the container kind. */
12733 if (die->parent->tag == DW_TAG_class_type)
12734 return DW_ACCESS_private;
12736 return DW_ACCESS_public;
12740 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12741 offset. If the attribute was not found return 0, otherwise return
12742 1. If it was found but could not properly be handled, set *OFFSET
12746 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12749 struct attribute *attr;
12751 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12756 /* Note that we do not check for a section offset first here.
12757 This is because DW_AT_data_member_location is new in DWARF 4,
12758 so if we see it, we can assume that a constant form is really
12759 a constant and not a section offset. */
12760 if (attr_form_is_constant (attr))
12761 *offset = dwarf2_get_attr_constant_value (attr, 0);
12762 else if (attr_form_is_section_offset (attr))
12763 dwarf2_complex_location_expr_complaint ();
12764 else if (attr_form_is_block (attr))
12765 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12767 dwarf2_complex_location_expr_complaint ();
12775 /* Add an aggregate field to the field list. */
12778 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12779 struct dwarf2_cu *cu)
12781 struct objfile *objfile = cu->objfile;
12782 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12783 struct nextfield *new_field;
12784 struct attribute *attr;
12786 const char *fieldname = "";
12788 /* Allocate a new field list entry and link it in. */
12789 new_field = XNEW (struct nextfield);
12790 make_cleanup (xfree, new_field);
12791 memset (new_field, 0, sizeof (struct nextfield));
12793 if (die->tag == DW_TAG_inheritance)
12795 new_field->next = fip->baseclasses;
12796 fip->baseclasses = new_field;
12800 new_field->next = fip->fields;
12801 fip->fields = new_field;
12805 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12807 new_field->accessibility = DW_UNSND (attr);
12809 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12810 if (new_field->accessibility != DW_ACCESS_public)
12811 fip->non_public_fields = 1;
12813 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12815 new_field->virtuality = DW_UNSND (attr);
12817 new_field->virtuality = DW_VIRTUALITY_none;
12819 fp = &new_field->field;
12821 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12825 /* Data member other than a C++ static data member. */
12827 /* Get type of field. */
12828 fp->type = die_type (die, cu);
12830 SET_FIELD_BITPOS (*fp, 0);
12832 /* Get bit size of field (zero if none). */
12833 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12836 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12840 FIELD_BITSIZE (*fp) = 0;
12843 /* Get bit offset of field. */
12844 if (handle_data_member_location (die, cu, &offset))
12845 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12846 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
12849 if (gdbarch_bits_big_endian (gdbarch))
12851 /* For big endian bits, the DW_AT_bit_offset gives the
12852 additional bit offset from the MSB of the containing
12853 anonymous object to the MSB of the field. We don't
12854 have to do anything special since we don't need to
12855 know the size of the anonymous object. */
12856 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
12860 /* For little endian bits, compute the bit offset to the
12861 MSB of the anonymous object, subtract off the number of
12862 bits from the MSB of the field to the MSB of the
12863 object, and then subtract off the number of bits of
12864 the field itself. The result is the bit offset of
12865 the LSB of the field. */
12866 int anonymous_size;
12867 int bit_offset = DW_UNSND (attr);
12869 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12872 /* The size of the anonymous object containing
12873 the bit field is explicit, so use the
12874 indicated size (in bytes). */
12875 anonymous_size = DW_UNSND (attr);
12879 /* The size of the anonymous object containing
12880 the bit field must be inferred from the type
12881 attribute of the data member containing the
12883 anonymous_size = TYPE_LENGTH (fp->type);
12885 SET_FIELD_BITPOS (*fp,
12886 (FIELD_BITPOS (*fp)
12887 + anonymous_size * bits_per_byte
12888 - bit_offset - FIELD_BITSIZE (*fp)));
12891 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
12893 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
12894 + dwarf2_get_attr_constant_value (attr, 0)));
12896 /* Get name of field. */
12897 fieldname = dwarf2_name (die, cu);
12898 if (fieldname == NULL)
12901 /* The name is already allocated along with this objfile, so we don't
12902 need to duplicate it for the type. */
12903 fp->name = fieldname;
12905 /* Change accessibility for artificial fields (e.g. virtual table
12906 pointer or virtual base class pointer) to private. */
12907 if (dwarf2_attr (die, DW_AT_artificial, cu))
12909 FIELD_ARTIFICIAL (*fp) = 1;
12910 new_field->accessibility = DW_ACCESS_private;
12911 fip->non_public_fields = 1;
12914 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
12916 /* C++ static member. */
12918 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
12919 is a declaration, but all versions of G++ as of this writing
12920 (so through at least 3.2.1) incorrectly generate
12921 DW_TAG_variable tags. */
12923 const char *physname;
12925 /* Get name of field. */
12926 fieldname = dwarf2_name (die, cu);
12927 if (fieldname == NULL)
12930 attr = dwarf2_attr (die, DW_AT_const_value, cu);
12932 /* Only create a symbol if this is an external value.
12933 new_symbol checks this and puts the value in the global symbol
12934 table, which we want. If it is not external, new_symbol
12935 will try to put the value in cu->list_in_scope which is wrong. */
12936 && dwarf2_flag_true_p (die, DW_AT_external, cu))
12938 /* A static const member, not much different than an enum as far as
12939 we're concerned, except that we can support more types. */
12940 new_symbol (die, NULL, cu);
12943 /* Get physical name. */
12944 physname = dwarf2_physname (fieldname, die, cu);
12946 /* The name is already allocated along with this objfile, so we don't
12947 need to duplicate it for the type. */
12948 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
12949 FIELD_TYPE (*fp) = die_type (die, cu);
12950 FIELD_NAME (*fp) = fieldname;
12952 else if (die->tag == DW_TAG_inheritance)
12956 /* C++ base class field. */
12957 if (handle_data_member_location (die, cu, &offset))
12958 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12959 FIELD_BITSIZE (*fp) = 0;
12960 FIELD_TYPE (*fp) = die_type (die, cu);
12961 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
12962 fip->nbaseclasses++;
12966 /* Add a typedef defined in the scope of the FIP's class. */
12969 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
12970 struct dwarf2_cu *cu)
12972 struct typedef_field_list *new_field;
12973 struct typedef_field *fp;
12975 /* Allocate a new field list entry and link it in. */
12976 new_field = XCNEW (struct typedef_field_list);
12977 make_cleanup (xfree, new_field);
12979 gdb_assert (die->tag == DW_TAG_typedef);
12981 fp = &new_field->field;
12983 /* Get name of field. */
12984 fp->name = dwarf2_name (die, cu);
12985 if (fp->name == NULL)
12988 fp->type = read_type_die (die, cu);
12990 new_field->next = fip->typedef_field_list;
12991 fip->typedef_field_list = new_field;
12992 fip->typedef_field_list_count++;
12995 /* Create the vector of fields, and attach it to the type. */
12998 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
12999 struct dwarf2_cu *cu)
13001 int nfields = fip->nfields;
13003 /* Record the field count, allocate space for the array of fields,
13004 and create blank accessibility bitfields if necessary. */
13005 TYPE_NFIELDS (type) = nfields;
13006 TYPE_FIELDS (type) = (struct field *)
13007 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13008 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13010 if (fip->non_public_fields && cu->language != language_ada)
13012 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13014 TYPE_FIELD_PRIVATE_BITS (type) =
13015 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13016 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13018 TYPE_FIELD_PROTECTED_BITS (type) =
13019 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13020 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13022 TYPE_FIELD_IGNORE_BITS (type) =
13023 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13024 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13027 /* If the type has baseclasses, allocate and clear a bit vector for
13028 TYPE_FIELD_VIRTUAL_BITS. */
13029 if (fip->nbaseclasses && cu->language != language_ada)
13031 int num_bytes = B_BYTES (fip->nbaseclasses);
13032 unsigned char *pointer;
13034 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13035 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13036 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13037 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13038 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13041 /* Copy the saved-up fields into the field vector. Start from the head of
13042 the list, adding to the tail of the field array, so that they end up in
13043 the same order in the array in which they were added to the list. */
13044 while (nfields-- > 0)
13046 struct nextfield *fieldp;
13050 fieldp = fip->fields;
13051 fip->fields = fieldp->next;
13055 fieldp = fip->baseclasses;
13056 fip->baseclasses = fieldp->next;
13059 TYPE_FIELD (type, nfields) = fieldp->field;
13060 switch (fieldp->accessibility)
13062 case DW_ACCESS_private:
13063 if (cu->language != language_ada)
13064 SET_TYPE_FIELD_PRIVATE (type, nfields);
13067 case DW_ACCESS_protected:
13068 if (cu->language != language_ada)
13069 SET_TYPE_FIELD_PROTECTED (type, nfields);
13072 case DW_ACCESS_public:
13076 /* Unknown accessibility. Complain and treat it as public. */
13078 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13079 fieldp->accessibility);
13083 if (nfields < fip->nbaseclasses)
13085 switch (fieldp->virtuality)
13087 case DW_VIRTUALITY_virtual:
13088 case DW_VIRTUALITY_pure_virtual:
13089 if (cu->language == language_ada)
13090 error (_("unexpected virtuality in component of Ada type"));
13091 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13098 /* Return true if this member function is a constructor, false
13102 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13104 const char *fieldname;
13105 const char *type_name;
13108 if (die->parent == NULL)
13111 if (die->parent->tag != DW_TAG_structure_type
13112 && die->parent->tag != DW_TAG_union_type
13113 && die->parent->tag != DW_TAG_class_type)
13116 fieldname = dwarf2_name (die, cu);
13117 type_name = dwarf2_name (die->parent, cu);
13118 if (fieldname == NULL || type_name == NULL)
13121 len = strlen (fieldname);
13122 return (strncmp (fieldname, type_name, len) == 0
13123 && (type_name[len] == '\0' || type_name[len] == '<'));
13126 /* Add a member function to the proper fieldlist. */
13129 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13130 struct type *type, struct dwarf2_cu *cu)
13132 struct objfile *objfile = cu->objfile;
13133 struct attribute *attr;
13134 struct fnfieldlist *flp;
13136 struct fn_field *fnp;
13137 const char *fieldname;
13138 struct nextfnfield *new_fnfield;
13139 struct type *this_type;
13140 enum dwarf_access_attribute accessibility;
13142 if (cu->language == language_ada)
13143 error (_("unexpected member function in Ada type"));
13145 /* Get name of member function. */
13146 fieldname = dwarf2_name (die, cu);
13147 if (fieldname == NULL)
13150 /* Look up member function name in fieldlist. */
13151 for (i = 0; i < fip->nfnfields; i++)
13153 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13157 /* Create new list element if necessary. */
13158 if (i < fip->nfnfields)
13159 flp = &fip->fnfieldlists[i];
13162 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13164 fip->fnfieldlists = (struct fnfieldlist *)
13165 xrealloc (fip->fnfieldlists,
13166 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13167 * sizeof (struct fnfieldlist));
13168 if (fip->nfnfields == 0)
13169 make_cleanup (free_current_contents, &fip->fnfieldlists);
13171 flp = &fip->fnfieldlists[fip->nfnfields];
13172 flp->name = fieldname;
13175 i = fip->nfnfields++;
13178 /* Create a new member function field and chain it to the field list
13180 new_fnfield = XNEW (struct nextfnfield);
13181 make_cleanup (xfree, new_fnfield);
13182 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13183 new_fnfield->next = flp->head;
13184 flp->head = new_fnfield;
13187 /* Fill in the member function field info. */
13188 fnp = &new_fnfield->fnfield;
13190 /* Delay processing of the physname until later. */
13191 if (cu->language == language_cplus)
13193 add_to_method_list (type, i, flp->length - 1, fieldname,
13198 const char *physname = dwarf2_physname (fieldname, die, cu);
13199 fnp->physname = physname ? physname : "";
13202 fnp->type = alloc_type (objfile);
13203 this_type = read_type_die (die, cu);
13204 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13206 int nparams = TYPE_NFIELDS (this_type);
13208 /* TYPE is the domain of this method, and THIS_TYPE is the type
13209 of the method itself (TYPE_CODE_METHOD). */
13210 smash_to_method_type (fnp->type, type,
13211 TYPE_TARGET_TYPE (this_type),
13212 TYPE_FIELDS (this_type),
13213 TYPE_NFIELDS (this_type),
13214 TYPE_VARARGS (this_type));
13216 /* Handle static member functions.
13217 Dwarf2 has no clean way to discern C++ static and non-static
13218 member functions. G++ helps GDB by marking the first
13219 parameter for non-static member functions (which is the this
13220 pointer) as artificial. We obtain this information from
13221 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
13222 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
13223 fnp->voffset = VOFFSET_STATIC;
13226 complaint (&symfile_complaints, _("member function type missing for '%s'"),
13227 dwarf2_full_name (fieldname, die, cu));
13229 /* Get fcontext from DW_AT_containing_type if present. */
13230 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13231 fnp->fcontext = die_containing_type (die, cu);
13233 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
13234 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
13236 /* Get accessibility. */
13237 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13239 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13241 accessibility = dwarf2_default_access_attribute (die, cu);
13242 switch (accessibility)
13244 case DW_ACCESS_private:
13245 fnp->is_private = 1;
13247 case DW_ACCESS_protected:
13248 fnp->is_protected = 1;
13252 /* Check for artificial methods. */
13253 attr = dwarf2_attr (die, DW_AT_artificial, cu);
13254 if (attr && DW_UNSND (attr) != 0)
13255 fnp->is_artificial = 1;
13257 fnp->is_constructor = dwarf2_is_constructor (die, cu);
13259 /* Get index in virtual function table if it is a virtual member
13260 function. For older versions of GCC, this is an offset in the
13261 appropriate virtual table, as specified by DW_AT_containing_type.
13262 For everyone else, it is an expression to be evaluated relative
13263 to the object address. */
13265 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
13268 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
13270 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
13272 /* Old-style GCC. */
13273 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
13275 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
13276 || (DW_BLOCK (attr)->size > 1
13277 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
13278 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
13280 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
13281 if ((fnp->voffset % cu->header.addr_size) != 0)
13282 dwarf2_complex_location_expr_complaint ();
13284 fnp->voffset /= cu->header.addr_size;
13288 dwarf2_complex_location_expr_complaint ();
13290 if (!fnp->fcontext)
13292 /* If there is no `this' field and no DW_AT_containing_type,
13293 we cannot actually find a base class context for the
13295 if (TYPE_NFIELDS (this_type) == 0
13296 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
13298 complaint (&symfile_complaints,
13299 _("cannot determine context for virtual member "
13300 "function \"%s\" (offset %d)"),
13301 fieldname, to_underlying (die->sect_off));
13306 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13310 else if (attr_form_is_section_offset (attr))
13312 dwarf2_complex_location_expr_complaint ();
13316 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13322 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13323 if (attr && DW_UNSND (attr))
13325 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13326 complaint (&symfile_complaints,
13327 _("Member function \"%s\" (offset %d) is virtual "
13328 "but the vtable offset is not specified"),
13329 fieldname, to_underlying (die->sect_off));
13330 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13331 TYPE_CPLUS_DYNAMIC (type) = 1;
13336 /* Create the vector of member function fields, and attach it to the type. */
13339 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13340 struct dwarf2_cu *cu)
13342 struct fnfieldlist *flp;
13345 if (cu->language == language_ada)
13346 error (_("unexpected member functions in Ada type"));
13348 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13349 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13350 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13352 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13354 struct nextfnfield *nfp = flp->head;
13355 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13358 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13359 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13360 fn_flp->fn_fields = (struct fn_field *)
13361 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13362 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13363 fn_flp->fn_fields[k] = nfp->fnfield;
13366 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13369 /* Returns non-zero if NAME is the name of a vtable member in CU's
13370 language, zero otherwise. */
13372 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13374 static const char vptr[] = "_vptr";
13375 static const char vtable[] = "vtable";
13377 /* Look for the C++ form of the vtable. */
13378 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13384 /* GCC outputs unnamed structures that are really pointers to member
13385 functions, with the ABI-specified layout. If TYPE describes
13386 such a structure, smash it into a member function type.
13388 GCC shouldn't do this; it should just output pointer to member DIEs.
13389 This is GCC PR debug/28767. */
13392 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13394 struct type *pfn_type, *self_type, *new_type;
13396 /* Check for a structure with no name and two children. */
13397 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13400 /* Check for __pfn and __delta members. */
13401 if (TYPE_FIELD_NAME (type, 0) == NULL
13402 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13403 || TYPE_FIELD_NAME (type, 1) == NULL
13404 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13407 /* Find the type of the method. */
13408 pfn_type = TYPE_FIELD_TYPE (type, 0);
13409 if (pfn_type == NULL
13410 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13411 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13414 /* Look for the "this" argument. */
13415 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13416 if (TYPE_NFIELDS (pfn_type) == 0
13417 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13418 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13421 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13422 new_type = alloc_type (objfile);
13423 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13424 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13425 TYPE_VARARGS (pfn_type));
13426 smash_to_methodptr_type (type, new_type);
13429 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13433 producer_is_icc (struct dwarf2_cu *cu)
13435 if (!cu->checked_producer)
13436 check_producer (cu);
13438 return cu->producer_is_icc;
13441 /* Called when we find the DIE that starts a structure or union scope
13442 (definition) to create a type for the structure or union. Fill in
13443 the type's name and general properties; the members will not be
13444 processed until process_structure_scope. A symbol table entry for
13445 the type will also not be done until process_structure_scope (assuming
13446 the type has a name).
13448 NOTE: we need to call these functions regardless of whether or not the
13449 DIE has a DW_AT_name attribute, since it might be an anonymous
13450 structure or union. This gets the type entered into our set of
13451 user defined types. */
13453 static struct type *
13454 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13456 struct objfile *objfile = cu->objfile;
13458 struct attribute *attr;
13461 /* If the definition of this type lives in .debug_types, read that type.
13462 Don't follow DW_AT_specification though, that will take us back up
13463 the chain and we want to go down. */
13464 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13467 type = get_DW_AT_signature_type (die, attr, cu);
13469 /* The type's CU may not be the same as CU.
13470 Ensure TYPE is recorded with CU in die_type_hash. */
13471 return set_die_type (die, type, cu);
13474 type = alloc_type (objfile);
13475 INIT_CPLUS_SPECIFIC (type);
13477 name = dwarf2_name (die, cu);
13480 if (cu->language == language_cplus
13481 || cu->language == language_d
13482 || cu->language == language_rust)
13484 const char *full_name = dwarf2_full_name (name, die, cu);
13486 /* dwarf2_full_name might have already finished building the DIE's
13487 type. If so, there is no need to continue. */
13488 if (get_die_type (die, cu) != NULL)
13489 return get_die_type (die, cu);
13491 TYPE_TAG_NAME (type) = full_name;
13492 if (die->tag == DW_TAG_structure_type
13493 || die->tag == DW_TAG_class_type)
13494 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13498 /* The name is already allocated along with this objfile, so
13499 we don't need to duplicate it for the type. */
13500 TYPE_TAG_NAME (type) = name;
13501 if (die->tag == DW_TAG_class_type)
13502 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13506 if (die->tag == DW_TAG_structure_type)
13508 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13510 else if (die->tag == DW_TAG_union_type)
13512 TYPE_CODE (type) = TYPE_CODE_UNION;
13516 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13519 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13520 TYPE_DECLARED_CLASS (type) = 1;
13522 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13525 if (attr_form_is_constant (attr))
13526 TYPE_LENGTH (type) = DW_UNSND (attr);
13529 /* For the moment, dynamic type sizes are not supported
13530 by GDB's struct type. The actual size is determined
13531 on-demand when resolving the type of a given object,
13532 so set the type's length to zero for now. Otherwise,
13533 we record an expression as the length, and that expression
13534 could lead to a very large value, which could eventually
13535 lead to us trying to allocate that much memory when creating
13536 a value of that type. */
13537 TYPE_LENGTH (type) = 0;
13542 TYPE_LENGTH (type) = 0;
13545 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13547 /* ICC does not output the required DW_AT_declaration
13548 on incomplete types, but gives them a size of zero. */
13549 TYPE_STUB (type) = 1;
13552 TYPE_STUB_SUPPORTED (type) = 1;
13554 if (die_is_declaration (die, cu))
13555 TYPE_STUB (type) = 1;
13556 else if (attr == NULL && die->child == NULL
13557 && producer_is_realview (cu->producer))
13558 /* RealView does not output the required DW_AT_declaration
13559 on incomplete types. */
13560 TYPE_STUB (type) = 1;
13562 /* We need to add the type field to the die immediately so we don't
13563 infinitely recurse when dealing with pointers to the structure
13564 type within the structure itself. */
13565 set_die_type (die, type, cu);
13567 /* set_die_type should be already done. */
13568 set_descriptive_type (type, die, cu);
13573 /* Finish creating a structure or union type, including filling in
13574 its members and creating a symbol for it. */
13577 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13579 struct objfile *objfile = cu->objfile;
13580 struct die_info *child_die;
13583 type = get_die_type (die, cu);
13585 type = read_structure_type (die, cu);
13587 if (die->child != NULL && ! die_is_declaration (die, cu))
13589 struct field_info fi;
13590 VEC (symbolp) *template_args = NULL;
13591 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13593 memset (&fi, 0, sizeof (struct field_info));
13595 child_die = die->child;
13597 while (child_die && child_die->tag)
13599 if (child_die->tag == DW_TAG_member
13600 || child_die->tag == DW_TAG_variable)
13602 /* NOTE: carlton/2002-11-05: A C++ static data member
13603 should be a DW_TAG_member that is a declaration, but
13604 all versions of G++ as of this writing (so through at
13605 least 3.2.1) incorrectly generate DW_TAG_variable
13606 tags for them instead. */
13607 dwarf2_add_field (&fi, child_die, cu);
13609 else if (child_die->tag == DW_TAG_subprogram)
13611 /* Rust doesn't have member functions in the C++ sense.
13612 However, it does emit ordinary functions as children
13613 of a struct DIE. */
13614 if (cu->language == language_rust)
13615 read_func_scope (child_die, cu);
13618 /* C++ member function. */
13619 dwarf2_add_member_fn (&fi, child_die, type, cu);
13622 else if (child_die->tag == DW_TAG_inheritance)
13624 /* C++ base class field. */
13625 dwarf2_add_field (&fi, child_die, cu);
13627 else if (child_die->tag == DW_TAG_typedef)
13628 dwarf2_add_typedef (&fi, child_die, cu);
13629 else if (child_die->tag == DW_TAG_template_type_param
13630 || child_die->tag == DW_TAG_template_value_param)
13632 struct symbol *arg = new_symbol (child_die, NULL, cu);
13635 VEC_safe_push (symbolp, template_args, arg);
13638 child_die = sibling_die (child_die);
13641 /* Attach template arguments to type. */
13642 if (! VEC_empty (symbolp, template_args))
13644 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13645 TYPE_N_TEMPLATE_ARGUMENTS (type)
13646 = VEC_length (symbolp, template_args);
13647 TYPE_TEMPLATE_ARGUMENTS (type)
13648 = XOBNEWVEC (&objfile->objfile_obstack,
13650 TYPE_N_TEMPLATE_ARGUMENTS (type));
13651 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13652 VEC_address (symbolp, template_args),
13653 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13654 * sizeof (struct symbol *)));
13655 VEC_free (symbolp, template_args);
13658 /* Attach fields and member functions to the type. */
13660 dwarf2_attach_fields_to_type (&fi, type, cu);
13663 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13665 /* Get the type which refers to the base class (possibly this
13666 class itself) which contains the vtable pointer for the current
13667 class from the DW_AT_containing_type attribute. This use of
13668 DW_AT_containing_type is a GNU extension. */
13670 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13672 struct type *t = die_containing_type (die, cu);
13674 set_type_vptr_basetype (type, t);
13679 /* Our own class provides vtbl ptr. */
13680 for (i = TYPE_NFIELDS (t) - 1;
13681 i >= TYPE_N_BASECLASSES (t);
13684 const char *fieldname = TYPE_FIELD_NAME (t, i);
13686 if (is_vtable_name (fieldname, cu))
13688 set_type_vptr_fieldno (type, i);
13693 /* Complain if virtual function table field not found. */
13694 if (i < TYPE_N_BASECLASSES (t))
13695 complaint (&symfile_complaints,
13696 _("virtual function table pointer "
13697 "not found when defining class '%s'"),
13698 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13703 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13706 else if (cu->producer
13707 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13709 /* The IBM XLC compiler does not provide direct indication
13710 of the containing type, but the vtable pointer is
13711 always named __vfp. */
13715 for (i = TYPE_NFIELDS (type) - 1;
13716 i >= TYPE_N_BASECLASSES (type);
13719 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13721 set_type_vptr_fieldno (type, i);
13722 set_type_vptr_basetype (type, type);
13729 /* Copy fi.typedef_field_list linked list elements content into the
13730 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13731 if (fi.typedef_field_list)
13733 int i = fi.typedef_field_list_count;
13735 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13736 TYPE_TYPEDEF_FIELD_ARRAY (type)
13737 = ((struct typedef_field *)
13738 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13739 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13741 /* Reverse the list order to keep the debug info elements order. */
13744 struct typedef_field *dest, *src;
13746 dest = &TYPE_TYPEDEF_FIELD (type, i);
13747 src = &fi.typedef_field_list->field;
13748 fi.typedef_field_list = fi.typedef_field_list->next;
13753 do_cleanups (back_to);
13756 quirk_gcc_member_function_pointer (type, objfile);
13758 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13759 snapshots) has been known to create a die giving a declaration
13760 for a class that has, as a child, a die giving a definition for a
13761 nested class. So we have to process our children even if the
13762 current die is a declaration. Normally, of course, a declaration
13763 won't have any children at all. */
13765 child_die = die->child;
13767 while (child_die != NULL && child_die->tag)
13769 if (child_die->tag == DW_TAG_member
13770 || child_die->tag == DW_TAG_variable
13771 || child_die->tag == DW_TAG_inheritance
13772 || child_die->tag == DW_TAG_template_value_param
13773 || child_die->tag == DW_TAG_template_type_param)
13778 process_die (child_die, cu);
13780 child_die = sibling_die (child_die);
13783 /* Do not consider external references. According to the DWARF standard,
13784 these DIEs are identified by the fact that they have no byte_size
13785 attribute, and a declaration attribute. */
13786 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13787 || !die_is_declaration (die, cu))
13788 new_symbol (die, type, cu);
13791 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13792 update TYPE using some information only available in DIE's children. */
13795 update_enumeration_type_from_children (struct die_info *die,
13797 struct dwarf2_cu *cu)
13799 struct obstack obstack;
13800 struct die_info *child_die;
13801 int unsigned_enum = 1;
13804 struct cleanup *old_chain;
13806 obstack_init (&obstack);
13807 old_chain = make_cleanup_obstack_free (&obstack);
13809 for (child_die = die->child;
13810 child_die != NULL && child_die->tag;
13811 child_die = sibling_die (child_die))
13813 struct attribute *attr;
13815 const gdb_byte *bytes;
13816 struct dwarf2_locexpr_baton *baton;
13819 if (child_die->tag != DW_TAG_enumerator)
13822 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13826 name = dwarf2_name (child_die, cu);
13828 name = "<anonymous enumerator>";
13830 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13831 &value, &bytes, &baton);
13837 else if ((mask & value) != 0)
13842 /* If we already know that the enum type is neither unsigned, nor
13843 a flag type, no need to look at the rest of the enumerates. */
13844 if (!unsigned_enum && !flag_enum)
13849 TYPE_UNSIGNED (type) = 1;
13851 TYPE_FLAG_ENUM (type) = 1;
13853 do_cleanups (old_chain);
13856 /* Given a DW_AT_enumeration_type die, set its type. We do not
13857 complete the type's fields yet, or create any symbols. */
13859 static struct type *
13860 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13862 struct objfile *objfile = cu->objfile;
13864 struct attribute *attr;
13867 /* If the definition of this type lives in .debug_types, read that type.
13868 Don't follow DW_AT_specification though, that will take us back up
13869 the chain and we want to go down. */
13870 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13873 type = get_DW_AT_signature_type (die, attr, cu);
13875 /* The type's CU may not be the same as CU.
13876 Ensure TYPE is recorded with CU in die_type_hash. */
13877 return set_die_type (die, type, cu);
13880 type = alloc_type (objfile);
13882 TYPE_CODE (type) = TYPE_CODE_ENUM;
13883 name = dwarf2_full_name (NULL, die, cu);
13885 TYPE_TAG_NAME (type) = name;
13887 attr = dwarf2_attr (die, DW_AT_type, cu);
13890 struct type *underlying_type = die_type (die, cu);
13892 TYPE_TARGET_TYPE (type) = underlying_type;
13895 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13898 TYPE_LENGTH (type) = DW_UNSND (attr);
13902 TYPE_LENGTH (type) = 0;
13905 /* The enumeration DIE can be incomplete. In Ada, any type can be
13906 declared as private in the package spec, and then defined only
13907 inside the package body. Such types are known as Taft Amendment
13908 Types. When another package uses such a type, an incomplete DIE
13909 may be generated by the compiler. */
13910 if (die_is_declaration (die, cu))
13911 TYPE_STUB (type) = 1;
13913 /* Finish the creation of this type by using the enum's children.
13914 We must call this even when the underlying type has been provided
13915 so that we can determine if we're looking at a "flag" enum. */
13916 update_enumeration_type_from_children (die, type, cu);
13918 /* If this type has an underlying type that is not a stub, then we
13919 may use its attributes. We always use the "unsigned" attribute
13920 in this situation, because ordinarily we guess whether the type
13921 is unsigned -- but the guess can be wrong and the underlying type
13922 can tell us the reality. However, we defer to a local size
13923 attribute if one exists, because this lets the compiler override
13924 the underlying type if needed. */
13925 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13927 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13928 if (TYPE_LENGTH (type) == 0)
13929 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13932 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
13934 return set_die_type (die, type, cu);
13937 /* Given a pointer to a die which begins an enumeration, process all
13938 the dies that define the members of the enumeration, and create the
13939 symbol for the enumeration type.
13941 NOTE: We reverse the order of the element list. */
13944 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
13946 struct type *this_type;
13948 this_type = get_die_type (die, cu);
13949 if (this_type == NULL)
13950 this_type = read_enumeration_type (die, cu);
13952 if (die->child != NULL)
13954 struct die_info *child_die;
13955 struct symbol *sym;
13956 struct field *fields = NULL;
13957 int num_fields = 0;
13960 child_die = die->child;
13961 while (child_die && child_die->tag)
13963 if (child_die->tag != DW_TAG_enumerator)
13965 process_die (child_die, cu);
13969 name = dwarf2_name (child_die, cu);
13972 sym = new_symbol (child_die, this_type, cu);
13974 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
13976 fields = (struct field *)
13978 (num_fields + DW_FIELD_ALLOC_CHUNK)
13979 * sizeof (struct field));
13982 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
13983 FIELD_TYPE (fields[num_fields]) = NULL;
13984 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
13985 FIELD_BITSIZE (fields[num_fields]) = 0;
13991 child_die = sibling_die (child_die);
13996 TYPE_NFIELDS (this_type) = num_fields;
13997 TYPE_FIELDS (this_type) = (struct field *)
13998 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
13999 memcpy (TYPE_FIELDS (this_type), fields,
14000 sizeof (struct field) * num_fields);
14005 /* If we are reading an enum from a .debug_types unit, and the enum
14006 is a declaration, and the enum is not the signatured type in the
14007 unit, then we do not want to add a symbol for it. Adding a
14008 symbol would in some cases obscure the true definition of the
14009 enum, giving users an incomplete type when the definition is
14010 actually available. Note that we do not want to do this for all
14011 enums which are just declarations, because C++0x allows forward
14012 enum declarations. */
14013 if (cu->per_cu->is_debug_types
14014 && die_is_declaration (die, cu))
14016 struct signatured_type *sig_type;
14018 sig_type = (struct signatured_type *) cu->per_cu;
14019 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14020 if (sig_type->type_offset_in_section != die->sect_off)
14024 new_symbol (die, this_type, cu);
14027 /* Extract all information from a DW_TAG_array_type DIE and put it in
14028 the DIE's type field. For now, this only handles one dimensional
14031 static struct type *
14032 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14034 struct objfile *objfile = cu->objfile;
14035 struct die_info *child_die;
14037 struct type *element_type, *range_type, *index_type;
14038 struct type **range_types = NULL;
14039 struct attribute *attr;
14041 struct cleanup *back_to;
14043 unsigned int bit_stride = 0;
14045 element_type = die_type (die, cu);
14047 /* The die_type call above may have already set the type for this DIE. */
14048 type = get_die_type (die, cu);
14052 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14054 bit_stride = DW_UNSND (attr) * 8;
14056 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14058 bit_stride = DW_UNSND (attr);
14060 /* Irix 6.2 native cc creates array types without children for
14061 arrays with unspecified length. */
14062 if (die->child == NULL)
14064 index_type = objfile_type (objfile)->builtin_int;
14065 range_type = create_static_range_type (NULL, index_type, 0, -1);
14066 type = create_array_type_with_stride (NULL, element_type, range_type,
14068 return set_die_type (die, type, cu);
14071 back_to = make_cleanup (null_cleanup, NULL);
14072 child_die = die->child;
14073 while (child_die && child_die->tag)
14075 if (child_die->tag == DW_TAG_subrange_type)
14077 struct type *child_type = read_type_die (child_die, cu);
14079 if (child_type != NULL)
14081 /* The range type was succesfully read. Save it for the
14082 array type creation. */
14083 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
14085 range_types = (struct type **)
14086 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
14087 * sizeof (struct type *));
14089 make_cleanup (free_current_contents, &range_types);
14091 range_types[ndim++] = child_type;
14094 child_die = sibling_die (child_die);
14097 /* Dwarf2 dimensions are output from left to right, create the
14098 necessary array types in backwards order. */
14100 type = element_type;
14102 if (read_array_order (die, cu) == DW_ORD_col_major)
14107 type = create_array_type_with_stride (NULL, type, range_types[i++],
14113 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14117 /* Understand Dwarf2 support for vector types (like they occur on
14118 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14119 array type. This is not part of the Dwarf2/3 standard yet, but a
14120 custom vendor extension. The main difference between a regular
14121 array and the vector variant is that vectors are passed by value
14123 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14125 make_vector_type (type);
14127 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14128 implementation may choose to implement triple vectors using this
14130 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14133 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14134 TYPE_LENGTH (type) = DW_UNSND (attr);
14136 complaint (&symfile_complaints,
14137 _("DW_AT_byte_size for array type smaller "
14138 "than the total size of elements"));
14141 name = dwarf2_name (die, cu);
14143 TYPE_NAME (type) = name;
14145 /* Install the type in the die. */
14146 set_die_type (die, type, cu);
14148 /* set_die_type should be already done. */
14149 set_descriptive_type (type, die, cu);
14151 do_cleanups (back_to);
14156 static enum dwarf_array_dim_ordering
14157 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14159 struct attribute *attr;
14161 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14164 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14166 /* GNU F77 is a special case, as at 08/2004 array type info is the
14167 opposite order to the dwarf2 specification, but data is still
14168 laid out as per normal fortran.
14170 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14171 version checking. */
14173 if (cu->language == language_fortran
14174 && cu->producer && strstr (cu->producer, "GNU F77"))
14176 return DW_ORD_row_major;
14179 switch (cu->language_defn->la_array_ordering)
14181 case array_column_major:
14182 return DW_ORD_col_major;
14183 case array_row_major:
14185 return DW_ORD_row_major;
14189 /* Extract all information from a DW_TAG_set_type DIE and put it in
14190 the DIE's type field. */
14192 static struct type *
14193 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14195 struct type *domain_type, *set_type;
14196 struct attribute *attr;
14198 domain_type = die_type (die, cu);
14200 /* The die_type call above may have already set the type for this DIE. */
14201 set_type = get_die_type (die, cu);
14205 set_type = create_set_type (NULL, domain_type);
14207 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14209 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14211 return set_die_type (die, set_type, cu);
14214 /* A helper for read_common_block that creates a locexpr baton.
14215 SYM is the symbol which we are marking as computed.
14216 COMMON_DIE is the DIE for the common block.
14217 COMMON_LOC is the location expression attribute for the common
14219 MEMBER_LOC is the location expression attribute for the particular
14220 member of the common block that we are processing.
14221 CU is the CU from which the above come. */
14224 mark_common_block_symbol_computed (struct symbol *sym,
14225 struct die_info *common_die,
14226 struct attribute *common_loc,
14227 struct attribute *member_loc,
14228 struct dwarf2_cu *cu)
14230 struct objfile *objfile = dwarf2_per_objfile->objfile;
14231 struct dwarf2_locexpr_baton *baton;
14233 unsigned int cu_off;
14234 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14235 LONGEST offset = 0;
14237 gdb_assert (common_loc && member_loc);
14238 gdb_assert (attr_form_is_block (common_loc));
14239 gdb_assert (attr_form_is_block (member_loc)
14240 || attr_form_is_constant (member_loc));
14242 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14243 baton->per_cu = cu->per_cu;
14244 gdb_assert (baton->per_cu);
14246 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
14248 if (attr_form_is_constant (member_loc))
14250 offset = dwarf2_get_attr_constant_value (member_loc, 0);
14251 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
14254 baton->size += DW_BLOCK (member_loc)->size;
14256 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
14259 *ptr++ = DW_OP_call4;
14260 cu_off = common_die->sect_off - cu->per_cu->sect_off;
14261 store_unsigned_integer (ptr, 4, byte_order, cu_off);
14264 if (attr_form_is_constant (member_loc))
14266 *ptr++ = DW_OP_addr;
14267 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
14268 ptr += cu->header.addr_size;
14272 /* We have to copy the data here, because DW_OP_call4 will only
14273 use a DW_AT_location attribute. */
14274 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
14275 ptr += DW_BLOCK (member_loc)->size;
14278 *ptr++ = DW_OP_plus;
14279 gdb_assert (ptr - baton->data == baton->size);
14281 SYMBOL_LOCATION_BATON (sym) = baton;
14282 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
14285 /* Create appropriate locally-scoped variables for all the
14286 DW_TAG_common_block entries. Also create a struct common_block
14287 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
14288 is used to sepate the common blocks name namespace from regular
14292 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
14294 struct attribute *attr;
14296 attr = dwarf2_attr (die, DW_AT_location, cu);
14299 /* Support the .debug_loc offsets. */
14300 if (attr_form_is_block (attr))
14304 else if (attr_form_is_section_offset (attr))
14306 dwarf2_complex_location_expr_complaint ();
14311 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14312 "common block member");
14317 if (die->child != NULL)
14319 struct objfile *objfile = cu->objfile;
14320 struct die_info *child_die;
14321 size_t n_entries = 0, size;
14322 struct common_block *common_block;
14323 struct symbol *sym;
14325 for (child_die = die->child;
14326 child_die && child_die->tag;
14327 child_die = sibling_die (child_die))
14330 size = (sizeof (struct common_block)
14331 + (n_entries - 1) * sizeof (struct symbol *));
14333 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14335 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14336 common_block->n_entries = 0;
14338 for (child_die = die->child;
14339 child_die && child_die->tag;
14340 child_die = sibling_die (child_die))
14342 /* Create the symbol in the DW_TAG_common_block block in the current
14344 sym = new_symbol (child_die, NULL, cu);
14347 struct attribute *member_loc;
14349 common_block->contents[common_block->n_entries++] = sym;
14351 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14355 /* GDB has handled this for a long time, but it is
14356 not specified by DWARF. It seems to have been
14357 emitted by gfortran at least as recently as:
14358 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14359 complaint (&symfile_complaints,
14360 _("Variable in common block has "
14361 "DW_AT_data_member_location "
14362 "- DIE at 0x%x [in module %s]"),
14363 to_underlying (child_die->sect_off),
14364 objfile_name (cu->objfile));
14366 if (attr_form_is_section_offset (member_loc))
14367 dwarf2_complex_location_expr_complaint ();
14368 else if (attr_form_is_constant (member_loc)
14369 || attr_form_is_block (member_loc))
14372 mark_common_block_symbol_computed (sym, die, attr,
14376 dwarf2_complex_location_expr_complaint ();
14381 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14382 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14386 /* Create a type for a C++ namespace. */
14388 static struct type *
14389 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14391 struct objfile *objfile = cu->objfile;
14392 const char *previous_prefix, *name;
14396 /* For extensions, reuse the type of the original namespace. */
14397 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14399 struct die_info *ext_die;
14400 struct dwarf2_cu *ext_cu = cu;
14402 ext_die = dwarf2_extension (die, &ext_cu);
14403 type = read_type_die (ext_die, ext_cu);
14405 /* EXT_CU may not be the same as CU.
14406 Ensure TYPE is recorded with CU in die_type_hash. */
14407 return set_die_type (die, type, cu);
14410 name = namespace_name (die, &is_anonymous, cu);
14412 /* Now build the name of the current namespace. */
14414 previous_prefix = determine_prefix (die, cu);
14415 if (previous_prefix[0] != '\0')
14416 name = typename_concat (&objfile->objfile_obstack,
14417 previous_prefix, name, 0, cu);
14419 /* Create the type. */
14420 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14421 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14423 return set_die_type (die, type, cu);
14426 /* Read a namespace scope. */
14429 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14431 struct objfile *objfile = cu->objfile;
14434 /* Add a symbol associated to this if we haven't seen the namespace
14435 before. Also, add a using directive if it's an anonymous
14438 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14442 type = read_type_die (die, cu);
14443 new_symbol (die, type, cu);
14445 namespace_name (die, &is_anonymous, cu);
14448 const char *previous_prefix = determine_prefix (die, cu);
14450 add_using_directive (using_directives (cu->language),
14451 previous_prefix, TYPE_NAME (type), NULL,
14452 NULL, NULL, 0, &objfile->objfile_obstack);
14456 if (die->child != NULL)
14458 struct die_info *child_die = die->child;
14460 while (child_die && child_die->tag)
14462 process_die (child_die, cu);
14463 child_die = sibling_die (child_die);
14468 /* Read a Fortran module as type. This DIE can be only a declaration used for
14469 imported module. Still we need that type as local Fortran "use ... only"
14470 declaration imports depend on the created type in determine_prefix. */
14472 static struct type *
14473 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14475 struct objfile *objfile = cu->objfile;
14476 const char *module_name;
14479 module_name = dwarf2_name (die, cu);
14481 complaint (&symfile_complaints,
14482 _("DW_TAG_module has no name, offset 0x%x"),
14483 to_underlying (die->sect_off));
14484 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14486 /* determine_prefix uses TYPE_TAG_NAME. */
14487 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14489 return set_die_type (die, type, cu);
14492 /* Read a Fortran module. */
14495 read_module (struct die_info *die, struct dwarf2_cu *cu)
14497 struct die_info *child_die = die->child;
14500 type = read_type_die (die, cu);
14501 new_symbol (die, type, cu);
14503 while (child_die && child_die->tag)
14505 process_die (child_die, cu);
14506 child_die = sibling_die (child_die);
14510 /* Return the name of the namespace represented by DIE. Set
14511 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14514 static const char *
14515 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14517 struct die_info *current_die;
14518 const char *name = NULL;
14520 /* Loop through the extensions until we find a name. */
14522 for (current_die = die;
14523 current_die != NULL;
14524 current_die = dwarf2_extension (die, &cu))
14526 /* We don't use dwarf2_name here so that we can detect the absence
14527 of a name -> anonymous namespace. */
14528 name = dwarf2_string_attr (die, DW_AT_name, cu);
14534 /* Is it an anonymous namespace? */
14536 *is_anonymous = (name == NULL);
14538 name = CP_ANONYMOUS_NAMESPACE_STR;
14543 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14544 the user defined type vector. */
14546 static struct type *
14547 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14549 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14550 struct comp_unit_head *cu_header = &cu->header;
14552 struct attribute *attr_byte_size;
14553 struct attribute *attr_address_class;
14554 int byte_size, addr_class;
14555 struct type *target_type;
14557 target_type = die_type (die, cu);
14559 /* The die_type call above may have already set the type for this DIE. */
14560 type = get_die_type (die, cu);
14564 type = lookup_pointer_type (target_type);
14566 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14567 if (attr_byte_size)
14568 byte_size = DW_UNSND (attr_byte_size);
14570 byte_size = cu_header->addr_size;
14572 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14573 if (attr_address_class)
14574 addr_class = DW_UNSND (attr_address_class);
14576 addr_class = DW_ADDR_none;
14578 /* If the pointer size or address class is different than the
14579 default, create a type variant marked as such and set the
14580 length accordingly. */
14581 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14583 if (gdbarch_address_class_type_flags_p (gdbarch))
14587 type_flags = gdbarch_address_class_type_flags
14588 (gdbarch, byte_size, addr_class);
14589 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14591 type = make_type_with_address_space (type, type_flags);
14593 else if (TYPE_LENGTH (type) != byte_size)
14595 complaint (&symfile_complaints,
14596 _("invalid pointer size %d"), byte_size);
14600 /* Should we also complain about unhandled address classes? */
14604 TYPE_LENGTH (type) = byte_size;
14605 return set_die_type (die, type, cu);
14608 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14609 the user defined type vector. */
14611 static struct type *
14612 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14615 struct type *to_type;
14616 struct type *domain;
14618 to_type = die_type (die, cu);
14619 domain = die_containing_type (die, cu);
14621 /* The calls above may have already set the type for this DIE. */
14622 type = get_die_type (die, cu);
14626 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14627 type = lookup_methodptr_type (to_type);
14628 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14630 struct type *new_type = alloc_type (cu->objfile);
14632 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14633 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14634 TYPE_VARARGS (to_type));
14635 type = lookup_methodptr_type (new_type);
14638 type = lookup_memberptr_type (to_type, domain);
14640 return set_die_type (die, type, cu);
14643 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
14644 the user defined type vector. */
14646 static struct type *
14647 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
14648 enum type_code refcode)
14650 struct comp_unit_head *cu_header = &cu->header;
14651 struct type *type, *target_type;
14652 struct attribute *attr;
14654 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
14656 target_type = die_type (die, cu);
14658 /* The die_type call above may have already set the type for this DIE. */
14659 type = get_die_type (die, cu);
14663 type = lookup_reference_type (target_type, refcode);
14664 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14667 TYPE_LENGTH (type) = DW_UNSND (attr);
14671 TYPE_LENGTH (type) = cu_header->addr_size;
14673 return set_die_type (die, type, cu);
14676 /* Add the given cv-qualifiers to the element type of the array. GCC
14677 outputs DWARF type qualifiers that apply to an array, not the
14678 element type. But GDB relies on the array element type to carry
14679 the cv-qualifiers. This mimics section 6.7.3 of the C99
14682 static struct type *
14683 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14684 struct type *base_type, int cnst, int voltl)
14686 struct type *el_type, *inner_array;
14688 base_type = copy_type (base_type);
14689 inner_array = base_type;
14691 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14693 TYPE_TARGET_TYPE (inner_array) =
14694 copy_type (TYPE_TARGET_TYPE (inner_array));
14695 inner_array = TYPE_TARGET_TYPE (inner_array);
14698 el_type = TYPE_TARGET_TYPE (inner_array);
14699 cnst |= TYPE_CONST (el_type);
14700 voltl |= TYPE_VOLATILE (el_type);
14701 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14703 return set_die_type (die, base_type, cu);
14706 static struct type *
14707 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14709 struct type *base_type, *cv_type;
14711 base_type = die_type (die, cu);
14713 /* The die_type call above may have already set the type for this DIE. */
14714 cv_type = get_die_type (die, cu);
14718 /* In case the const qualifier is applied to an array type, the element type
14719 is so qualified, not the array type (section 6.7.3 of C99). */
14720 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14721 return add_array_cv_type (die, cu, base_type, 1, 0);
14723 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14724 return set_die_type (die, cv_type, cu);
14727 static struct type *
14728 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14730 struct type *base_type, *cv_type;
14732 base_type = die_type (die, cu);
14734 /* The die_type call above may have already set the type for this DIE. */
14735 cv_type = get_die_type (die, cu);
14739 /* In case the volatile qualifier is applied to an array type, the
14740 element type is so qualified, not the array type (section 6.7.3
14742 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14743 return add_array_cv_type (die, cu, base_type, 0, 1);
14745 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14746 return set_die_type (die, cv_type, cu);
14749 /* Handle DW_TAG_restrict_type. */
14751 static struct type *
14752 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14754 struct type *base_type, *cv_type;
14756 base_type = die_type (die, cu);
14758 /* The die_type call above may have already set the type for this DIE. */
14759 cv_type = get_die_type (die, cu);
14763 cv_type = make_restrict_type (base_type);
14764 return set_die_type (die, cv_type, cu);
14767 /* Handle DW_TAG_atomic_type. */
14769 static struct type *
14770 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14772 struct type *base_type, *cv_type;
14774 base_type = die_type (die, cu);
14776 /* The die_type call above may have already set the type for this DIE. */
14777 cv_type = get_die_type (die, cu);
14781 cv_type = make_atomic_type (base_type);
14782 return set_die_type (die, cv_type, cu);
14785 /* Extract all information from a DW_TAG_string_type DIE and add to
14786 the user defined type vector. It isn't really a user defined type,
14787 but it behaves like one, with other DIE's using an AT_user_def_type
14788 attribute to reference it. */
14790 static struct type *
14791 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14793 struct objfile *objfile = cu->objfile;
14794 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14795 struct type *type, *range_type, *index_type, *char_type;
14796 struct attribute *attr;
14797 unsigned int length;
14799 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14802 length = DW_UNSND (attr);
14806 /* Check for the DW_AT_byte_size attribute. */
14807 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14810 length = DW_UNSND (attr);
14818 index_type = objfile_type (objfile)->builtin_int;
14819 range_type = create_static_range_type (NULL, index_type, 1, length);
14820 char_type = language_string_char_type (cu->language_defn, gdbarch);
14821 type = create_string_type (NULL, char_type, range_type);
14823 return set_die_type (die, type, cu);
14826 /* Assuming that DIE corresponds to a function, returns nonzero
14827 if the function is prototyped. */
14830 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14832 struct attribute *attr;
14834 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14835 if (attr && (DW_UNSND (attr) != 0))
14838 /* The DWARF standard implies that the DW_AT_prototyped attribute
14839 is only meaninful for C, but the concept also extends to other
14840 languages that allow unprototyped functions (Eg: Objective C).
14841 For all other languages, assume that functions are always
14843 if (cu->language != language_c
14844 && cu->language != language_objc
14845 && cu->language != language_opencl)
14848 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14849 prototyped and unprototyped functions; default to prototyped,
14850 since that is more common in modern code (and RealView warns
14851 about unprototyped functions). */
14852 if (producer_is_realview (cu->producer))
14858 /* Handle DIES due to C code like:
14862 int (*funcp)(int a, long l);
14866 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14868 static struct type *
14869 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14871 struct objfile *objfile = cu->objfile;
14872 struct type *type; /* Type that this function returns. */
14873 struct type *ftype; /* Function that returns above type. */
14874 struct attribute *attr;
14876 type = die_type (die, cu);
14878 /* The die_type call above may have already set the type for this DIE. */
14879 ftype = get_die_type (die, cu);
14883 ftype = lookup_function_type (type);
14885 if (prototyped_function_p (die, cu))
14886 TYPE_PROTOTYPED (ftype) = 1;
14888 /* Store the calling convention in the type if it's available in
14889 the subroutine die. Otherwise set the calling convention to
14890 the default value DW_CC_normal. */
14891 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14893 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14894 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14895 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14897 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14899 /* Record whether the function returns normally to its caller or not
14900 if the DWARF producer set that information. */
14901 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
14902 if (attr && (DW_UNSND (attr) != 0))
14903 TYPE_NO_RETURN (ftype) = 1;
14905 /* We need to add the subroutine type to the die immediately so
14906 we don't infinitely recurse when dealing with parameters
14907 declared as the same subroutine type. */
14908 set_die_type (die, ftype, cu);
14910 if (die->child != NULL)
14912 struct type *void_type = objfile_type (objfile)->builtin_void;
14913 struct die_info *child_die;
14914 int nparams, iparams;
14916 /* Count the number of parameters.
14917 FIXME: GDB currently ignores vararg functions, but knows about
14918 vararg member functions. */
14920 child_die = die->child;
14921 while (child_die && child_die->tag)
14923 if (child_die->tag == DW_TAG_formal_parameter)
14925 else if (child_die->tag == DW_TAG_unspecified_parameters)
14926 TYPE_VARARGS (ftype) = 1;
14927 child_die = sibling_die (child_die);
14930 /* Allocate storage for parameters and fill them in. */
14931 TYPE_NFIELDS (ftype) = nparams;
14932 TYPE_FIELDS (ftype) = (struct field *)
14933 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
14935 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
14936 even if we error out during the parameters reading below. */
14937 for (iparams = 0; iparams < nparams; iparams++)
14938 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
14941 child_die = die->child;
14942 while (child_die && child_die->tag)
14944 if (child_die->tag == DW_TAG_formal_parameter)
14946 struct type *arg_type;
14948 /* DWARF version 2 has no clean way to discern C++
14949 static and non-static member functions. G++ helps
14950 GDB by marking the first parameter for non-static
14951 member functions (which is the this pointer) as
14952 artificial. We pass this information to
14953 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
14955 DWARF version 3 added DW_AT_object_pointer, which GCC
14956 4.5 does not yet generate. */
14957 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
14959 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
14961 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
14962 arg_type = die_type (child_die, cu);
14964 /* RealView does not mark THIS as const, which the testsuite
14965 expects. GCC marks THIS as const in method definitions,
14966 but not in the class specifications (GCC PR 43053). */
14967 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
14968 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
14971 struct dwarf2_cu *arg_cu = cu;
14972 const char *name = dwarf2_name (child_die, cu);
14974 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
14977 /* If the compiler emits this, use it. */
14978 if (follow_die_ref (die, attr, &arg_cu) == child_die)
14981 else if (name && strcmp (name, "this") == 0)
14982 /* Function definitions will have the argument names. */
14984 else if (name == NULL && iparams == 0)
14985 /* Declarations may not have the names, so like
14986 elsewhere in GDB, assume an artificial first
14987 argument is "this". */
14991 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
14995 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
14998 child_die = sibling_die (child_die);
15005 static struct type *
15006 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15008 struct objfile *objfile = cu->objfile;
15009 const char *name = NULL;
15010 struct type *this_type, *target_type;
15012 name = dwarf2_full_name (NULL, die, cu);
15013 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15014 TYPE_TARGET_STUB (this_type) = 1;
15015 set_die_type (die, this_type, cu);
15016 target_type = die_type (die, cu);
15017 if (target_type != this_type)
15018 TYPE_TARGET_TYPE (this_type) = target_type;
15021 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15022 spec and cause infinite loops in GDB. */
15023 complaint (&symfile_complaints,
15024 _("Self-referential DW_TAG_typedef "
15025 "- DIE at 0x%x [in module %s]"),
15026 to_underlying (die->sect_off), objfile_name (objfile));
15027 TYPE_TARGET_TYPE (this_type) = NULL;
15032 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15033 (which may be different from NAME) to the architecture back-end to allow
15034 it to guess the correct format if necessary. */
15036 static struct type *
15037 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15038 const char *name_hint)
15040 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15041 const struct floatformat **format;
15044 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15046 type = init_float_type (objfile, bits, name, format);
15048 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
15053 /* Find a representation of a given base type and install
15054 it in the TYPE field of the die. */
15056 static struct type *
15057 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15059 struct objfile *objfile = cu->objfile;
15061 struct attribute *attr;
15062 int encoding = 0, bits = 0;
15065 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15068 encoding = DW_UNSND (attr);
15070 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15073 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15075 name = dwarf2_name (die, cu);
15078 complaint (&symfile_complaints,
15079 _("DW_AT_name missing from DW_TAG_base_type"));
15084 case DW_ATE_address:
15085 /* Turn DW_ATE_address into a void * pointer. */
15086 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
15087 type = init_pointer_type (objfile, bits, name, type);
15089 case DW_ATE_boolean:
15090 type = init_boolean_type (objfile, bits, 1, name);
15092 case DW_ATE_complex_float:
15093 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15094 type = init_complex_type (objfile, name, type);
15096 case DW_ATE_decimal_float:
15097 type = init_decfloat_type (objfile, bits, name);
15100 type = dwarf2_init_float_type (objfile, bits, name, name);
15102 case DW_ATE_signed:
15103 type = init_integer_type (objfile, bits, 0, name);
15105 case DW_ATE_unsigned:
15106 if (cu->language == language_fortran
15108 && startswith (name, "character("))
15109 type = init_character_type (objfile, bits, 1, name);
15111 type = init_integer_type (objfile, bits, 1, name);
15113 case DW_ATE_signed_char:
15114 if (cu->language == language_ada || cu->language == language_m2
15115 || cu->language == language_pascal
15116 || cu->language == language_fortran)
15117 type = init_character_type (objfile, bits, 0, name);
15119 type = init_integer_type (objfile, bits, 0, name);
15121 case DW_ATE_unsigned_char:
15122 if (cu->language == language_ada || cu->language == language_m2
15123 || cu->language == language_pascal
15124 || cu->language == language_fortran
15125 || cu->language == language_rust)
15126 type = init_character_type (objfile, bits, 1, name);
15128 type = init_integer_type (objfile, bits, 1, name);
15132 gdbarch *arch = get_objfile_arch (objfile);
15135 type = builtin_type (arch)->builtin_char16;
15136 else if (bits == 32)
15137 type = builtin_type (arch)->builtin_char32;
15140 complaint (&symfile_complaints,
15141 _("unsupported DW_ATE_UTF bit size: '%d'"),
15143 type = init_integer_type (objfile, bits, 1, name);
15145 return set_die_type (die, type, cu);
15150 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15151 dwarf_type_encoding_name (encoding));
15152 type = init_type (objfile, TYPE_CODE_ERROR,
15153 bits / TARGET_CHAR_BIT, name);
15157 if (name && strcmp (name, "char") == 0)
15158 TYPE_NOSIGN (type) = 1;
15160 return set_die_type (die, type, cu);
15163 /* Parse dwarf attribute if it's a block, reference or constant and put the
15164 resulting value of the attribute into struct bound_prop.
15165 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15168 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15169 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15171 struct dwarf2_property_baton *baton;
15172 struct obstack *obstack = &cu->objfile->objfile_obstack;
15174 if (attr == NULL || prop == NULL)
15177 if (attr_form_is_block (attr))
15179 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15180 baton->referenced_type = NULL;
15181 baton->locexpr.per_cu = cu->per_cu;
15182 baton->locexpr.size = DW_BLOCK (attr)->size;
15183 baton->locexpr.data = DW_BLOCK (attr)->data;
15184 prop->data.baton = baton;
15185 prop->kind = PROP_LOCEXPR;
15186 gdb_assert (prop->data.baton != NULL);
15188 else if (attr_form_is_ref (attr))
15190 struct dwarf2_cu *target_cu = cu;
15191 struct die_info *target_die;
15192 struct attribute *target_attr;
15194 target_die = follow_die_ref (die, attr, &target_cu);
15195 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15196 if (target_attr == NULL)
15197 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15199 if (target_attr == NULL)
15202 switch (target_attr->name)
15204 case DW_AT_location:
15205 if (attr_form_is_section_offset (target_attr))
15207 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15208 baton->referenced_type = die_type (target_die, target_cu);
15209 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15210 prop->data.baton = baton;
15211 prop->kind = PROP_LOCLIST;
15212 gdb_assert (prop->data.baton != NULL);
15214 else if (attr_form_is_block (target_attr))
15216 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15217 baton->referenced_type = die_type (target_die, target_cu);
15218 baton->locexpr.per_cu = cu->per_cu;
15219 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15220 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15221 prop->data.baton = baton;
15222 prop->kind = PROP_LOCEXPR;
15223 gdb_assert (prop->data.baton != NULL);
15227 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15228 "dynamic property");
15232 case DW_AT_data_member_location:
15236 if (!handle_data_member_location (target_die, target_cu,
15240 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15241 baton->referenced_type = read_type_die (target_die->parent,
15243 baton->offset_info.offset = offset;
15244 baton->offset_info.type = die_type (target_die, target_cu);
15245 prop->data.baton = baton;
15246 prop->kind = PROP_ADDR_OFFSET;
15251 else if (attr_form_is_constant (attr))
15253 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
15254 prop->kind = PROP_CONST;
15258 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
15259 dwarf2_name (die, cu));
15266 /* Read the given DW_AT_subrange DIE. */
15268 static struct type *
15269 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
15271 struct type *base_type, *orig_base_type;
15272 struct type *range_type;
15273 struct attribute *attr;
15274 struct dynamic_prop low, high;
15275 int low_default_is_valid;
15276 int high_bound_is_count = 0;
15278 LONGEST negative_mask;
15280 orig_base_type = die_type (die, cu);
15281 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
15282 whereas the real type might be. So, we use ORIG_BASE_TYPE when
15283 creating the range type, but we use the result of check_typedef
15284 when examining properties of the type. */
15285 base_type = check_typedef (orig_base_type);
15287 /* The die_type call above may have already set the type for this DIE. */
15288 range_type = get_die_type (die, cu);
15292 low.kind = PROP_CONST;
15293 high.kind = PROP_CONST;
15294 high.data.const_val = 0;
15296 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
15297 omitting DW_AT_lower_bound. */
15298 switch (cu->language)
15301 case language_cplus:
15302 low.data.const_val = 0;
15303 low_default_is_valid = 1;
15305 case language_fortran:
15306 low.data.const_val = 1;
15307 low_default_is_valid = 1;
15310 case language_objc:
15311 case language_rust:
15312 low.data.const_val = 0;
15313 low_default_is_valid = (cu->header.version >= 4);
15317 case language_pascal:
15318 low.data.const_val = 1;
15319 low_default_is_valid = (cu->header.version >= 4);
15322 low.data.const_val = 0;
15323 low_default_is_valid = 0;
15327 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15329 attr_to_dynamic_prop (attr, die, cu, &low);
15330 else if (!low_default_is_valid)
15331 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15332 "- DIE at 0x%x [in module %s]"),
15333 to_underlying (die->sect_off), objfile_name (cu->objfile));
15335 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15336 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15338 attr = dwarf2_attr (die, DW_AT_count, cu);
15339 if (attr_to_dynamic_prop (attr, die, cu, &high))
15341 /* If bounds are constant do the final calculation here. */
15342 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15343 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15345 high_bound_is_count = 1;
15349 /* Dwarf-2 specifications explicitly allows to create subrange types
15350 without specifying a base type.
15351 In that case, the base type must be set to the type of
15352 the lower bound, upper bound or count, in that order, if any of these
15353 three attributes references an object that has a type.
15354 If no base type is found, the Dwarf-2 specifications say that
15355 a signed integer type of size equal to the size of an address should
15357 For the following C code: `extern char gdb_int [];'
15358 GCC produces an empty range DIE.
15359 FIXME: muller/2010-05-28: Possible references to object for low bound,
15360 high bound or count are not yet handled by this code. */
15361 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15363 struct objfile *objfile = cu->objfile;
15364 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15365 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15366 struct type *int_type = objfile_type (objfile)->builtin_int;
15368 /* Test "int", "long int", and "long long int" objfile types,
15369 and select the first one having a size above or equal to the
15370 architecture address size. */
15371 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15372 base_type = int_type;
15375 int_type = objfile_type (objfile)->builtin_long;
15376 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15377 base_type = int_type;
15380 int_type = objfile_type (objfile)->builtin_long_long;
15381 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15382 base_type = int_type;
15387 /* Normally, the DWARF producers are expected to use a signed
15388 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15389 But this is unfortunately not always the case, as witnessed
15390 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15391 is used instead. To work around that ambiguity, we treat
15392 the bounds as signed, and thus sign-extend their values, when
15393 the base type is signed. */
15395 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15396 if (low.kind == PROP_CONST
15397 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15398 low.data.const_val |= negative_mask;
15399 if (high.kind == PROP_CONST
15400 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15401 high.data.const_val |= negative_mask;
15403 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15405 if (high_bound_is_count)
15406 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15408 /* Ada expects an empty array on no boundary attributes. */
15409 if (attr == NULL && cu->language != language_ada)
15410 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15412 name = dwarf2_name (die, cu);
15414 TYPE_NAME (range_type) = name;
15416 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15418 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15420 set_die_type (die, range_type, cu);
15422 /* set_die_type should be already done. */
15423 set_descriptive_type (range_type, die, cu);
15428 static struct type *
15429 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15433 /* For now, we only support the C meaning of an unspecified type: void. */
15435 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15436 TYPE_NAME (type) = dwarf2_name (die, cu);
15438 return set_die_type (die, type, cu);
15441 /* Read a single die and all its descendents. Set the die's sibling
15442 field to NULL; set other fields in the die correctly, and set all
15443 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15444 location of the info_ptr after reading all of those dies. PARENT
15445 is the parent of the die in question. */
15447 static struct die_info *
15448 read_die_and_children (const struct die_reader_specs *reader,
15449 const gdb_byte *info_ptr,
15450 const gdb_byte **new_info_ptr,
15451 struct die_info *parent)
15453 struct die_info *die;
15454 const gdb_byte *cur_ptr;
15457 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15460 *new_info_ptr = cur_ptr;
15463 store_in_ref_table (die, reader->cu);
15466 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15470 *new_info_ptr = cur_ptr;
15473 die->sibling = NULL;
15474 die->parent = parent;
15478 /* Read a die, all of its descendents, and all of its siblings; set
15479 all of the fields of all of the dies correctly. Arguments are as
15480 in read_die_and_children. */
15482 static struct die_info *
15483 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15484 const gdb_byte *info_ptr,
15485 const gdb_byte **new_info_ptr,
15486 struct die_info *parent)
15488 struct die_info *first_die, *last_sibling;
15489 const gdb_byte *cur_ptr;
15491 cur_ptr = info_ptr;
15492 first_die = last_sibling = NULL;
15496 struct die_info *die
15497 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15501 *new_info_ptr = cur_ptr;
15508 last_sibling->sibling = die;
15510 last_sibling = die;
15514 /* Read a die, all of its descendents, and all of its siblings; set
15515 all of the fields of all of the dies correctly. Arguments are as
15516 in read_die_and_children.
15517 This the main entry point for reading a DIE and all its children. */
15519 static struct die_info *
15520 read_die_and_siblings (const struct die_reader_specs *reader,
15521 const gdb_byte *info_ptr,
15522 const gdb_byte **new_info_ptr,
15523 struct die_info *parent)
15525 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15526 new_info_ptr, parent);
15528 if (dwarf_die_debug)
15530 fprintf_unfiltered (gdb_stdlog,
15531 "Read die from %s@0x%x of %s:\n",
15532 get_section_name (reader->die_section),
15533 (unsigned) (info_ptr - reader->die_section->buffer),
15534 bfd_get_filename (reader->abfd));
15535 dump_die (die, dwarf_die_debug);
15541 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15543 The caller is responsible for filling in the extra attributes
15544 and updating (*DIEP)->num_attrs.
15545 Set DIEP to point to a newly allocated die with its information,
15546 except for its child, sibling, and parent fields.
15547 Set HAS_CHILDREN to tell whether the die has children or not. */
15549 static const gdb_byte *
15550 read_full_die_1 (const struct die_reader_specs *reader,
15551 struct die_info **diep, const gdb_byte *info_ptr,
15552 int *has_children, int num_extra_attrs)
15554 unsigned int abbrev_number, bytes_read, i;
15555 struct abbrev_info *abbrev;
15556 struct die_info *die;
15557 struct dwarf2_cu *cu = reader->cu;
15558 bfd *abfd = reader->abfd;
15560 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
15561 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15562 info_ptr += bytes_read;
15563 if (!abbrev_number)
15570 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15572 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15574 bfd_get_filename (abfd));
15576 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15577 die->sect_off = sect_off;
15578 die->tag = abbrev->tag;
15579 die->abbrev = abbrev_number;
15581 /* Make the result usable.
15582 The caller needs to update num_attrs after adding the extra
15584 die->num_attrs = abbrev->num_attrs;
15586 for (i = 0; i < abbrev->num_attrs; ++i)
15587 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15591 *has_children = abbrev->has_children;
15595 /* Read a die and all its attributes.
15596 Set DIEP to point to a newly allocated die with its information,
15597 except for its child, sibling, and parent fields.
15598 Set HAS_CHILDREN to tell whether the die has children or not. */
15600 static const gdb_byte *
15601 read_full_die (const struct die_reader_specs *reader,
15602 struct die_info **diep, const gdb_byte *info_ptr,
15605 const gdb_byte *result;
15607 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15609 if (dwarf_die_debug)
15611 fprintf_unfiltered (gdb_stdlog,
15612 "Read die from %s@0x%x of %s:\n",
15613 get_section_name (reader->die_section),
15614 (unsigned) (info_ptr - reader->die_section->buffer),
15615 bfd_get_filename (reader->abfd));
15616 dump_die (*diep, dwarf_die_debug);
15622 /* Abbreviation tables.
15624 In DWARF version 2, the description of the debugging information is
15625 stored in a separate .debug_abbrev section. Before we read any
15626 dies from a section we read in all abbreviations and install them
15627 in a hash table. */
15629 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15631 static struct abbrev_info *
15632 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15634 struct abbrev_info *abbrev;
15636 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15637 memset (abbrev, 0, sizeof (struct abbrev_info));
15642 /* Add an abbreviation to the table. */
15645 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15646 unsigned int abbrev_number,
15647 struct abbrev_info *abbrev)
15649 unsigned int hash_number;
15651 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15652 abbrev->next = abbrev_table->abbrevs[hash_number];
15653 abbrev_table->abbrevs[hash_number] = abbrev;
15656 /* Look up an abbrev in the table.
15657 Returns NULL if the abbrev is not found. */
15659 static struct abbrev_info *
15660 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15661 unsigned int abbrev_number)
15663 unsigned int hash_number;
15664 struct abbrev_info *abbrev;
15666 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15667 abbrev = abbrev_table->abbrevs[hash_number];
15671 if (abbrev->number == abbrev_number)
15673 abbrev = abbrev->next;
15678 /* Read in an abbrev table. */
15680 static struct abbrev_table *
15681 abbrev_table_read_table (struct dwarf2_section_info *section,
15682 sect_offset sect_off)
15684 struct objfile *objfile = dwarf2_per_objfile->objfile;
15685 bfd *abfd = get_section_bfd_owner (section);
15686 struct abbrev_table *abbrev_table;
15687 const gdb_byte *abbrev_ptr;
15688 struct abbrev_info *cur_abbrev;
15689 unsigned int abbrev_number, bytes_read, abbrev_name;
15690 unsigned int abbrev_form;
15691 struct attr_abbrev *cur_attrs;
15692 unsigned int allocated_attrs;
15694 abbrev_table = XNEW (struct abbrev_table);
15695 abbrev_table->sect_off = sect_off;
15696 obstack_init (&abbrev_table->abbrev_obstack);
15697 abbrev_table->abbrevs =
15698 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15700 memset (abbrev_table->abbrevs, 0,
15701 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15703 dwarf2_read_section (objfile, section);
15704 abbrev_ptr = section->buffer + to_underlying (sect_off);
15705 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15706 abbrev_ptr += bytes_read;
15708 allocated_attrs = ATTR_ALLOC_CHUNK;
15709 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15711 /* Loop until we reach an abbrev number of 0. */
15712 while (abbrev_number)
15714 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15716 /* read in abbrev header */
15717 cur_abbrev->number = abbrev_number;
15719 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15720 abbrev_ptr += bytes_read;
15721 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15724 /* now read in declarations */
15727 LONGEST implicit_const;
15729 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15730 abbrev_ptr += bytes_read;
15731 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15732 abbrev_ptr += bytes_read;
15733 if (abbrev_form == DW_FORM_implicit_const)
15735 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
15737 abbrev_ptr += bytes_read;
15741 /* Initialize it due to a false compiler warning. */
15742 implicit_const = -1;
15745 if (abbrev_name == 0)
15748 if (cur_abbrev->num_attrs == allocated_attrs)
15750 allocated_attrs += ATTR_ALLOC_CHUNK;
15752 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15755 cur_attrs[cur_abbrev->num_attrs].name
15756 = (enum dwarf_attribute) abbrev_name;
15757 cur_attrs[cur_abbrev->num_attrs].form
15758 = (enum dwarf_form) abbrev_form;
15759 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
15760 ++cur_abbrev->num_attrs;
15763 cur_abbrev->attrs =
15764 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15765 cur_abbrev->num_attrs);
15766 memcpy (cur_abbrev->attrs, cur_attrs,
15767 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15769 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15771 /* Get next abbreviation.
15772 Under Irix6 the abbreviations for a compilation unit are not
15773 always properly terminated with an abbrev number of 0.
15774 Exit loop if we encounter an abbreviation which we have
15775 already read (which means we are about to read the abbreviations
15776 for the next compile unit) or if the end of the abbreviation
15777 table is reached. */
15778 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15780 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15781 abbrev_ptr += bytes_read;
15782 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15787 return abbrev_table;
15790 /* Free the resources held by ABBREV_TABLE. */
15793 abbrev_table_free (struct abbrev_table *abbrev_table)
15795 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15796 xfree (abbrev_table);
15799 /* Same as abbrev_table_free but as a cleanup.
15800 We pass in a pointer to the pointer to the table so that we can
15801 set the pointer to NULL when we're done. It also simplifies
15802 build_type_psymtabs_1. */
15805 abbrev_table_free_cleanup (void *table_ptr)
15807 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15809 if (*abbrev_table_ptr != NULL)
15810 abbrev_table_free (*abbrev_table_ptr);
15811 *abbrev_table_ptr = NULL;
15814 /* Read the abbrev table for CU from ABBREV_SECTION. */
15817 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15818 struct dwarf2_section_info *abbrev_section)
15821 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
15824 /* Release the memory used by the abbrev table for a compilation unit. */
15827 dwarf2_free_abbrev_table (void *ptr_to_cu)
15829 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
15831 if (cu->abbrev_table != NULL)
15832 abbrev_table_free (cu->abbrev_table);
15833 /* Set this to NULL so that we SEGV if we try to read it later,
15834 and also because free_comp_unit verifies this is NULL. */
15835 cu->abbrev_table = NULL;
15838 /* Returns nonzero if TAG represents a type that we might generate a partial
15842 is_type_tag_for_partial (int tag)
15847 /* Some types that would be reasonable to generate partial symbols for,
15848 that we don't at present. */
15849 case DW_TAG_array_type:
15850 case DW_TAG_file_type:
15851 case DW_TAG_ptr_to_member_type:
15852 case DW_TAG_set_type:
15853 case DW_TAG_string_type:
15854 case DW_TAG_subroutine_type:
15856 case DW_TAG_base_type:
15857 case DW_TAG_class_type:
15858 case DW_TAG_interface_type:
15859 case DW_TAG_enumeration_type:
15860 case DW_TAG_structure_type:
15861 case DW_TAG_subrange_type:
15862 case DW_TAG_typedef:
15863 case DW_TAG_union_type:
15870 /* Load all DIEs that are interesting for partial symbols into memory. */
15872 static struct partial_die_info *
15873 load_partial_dies (const struct die_reader_specs *reader,
15874 const gdb_byte *info_ptr, int building_psymtab)
15876 struct dwarf2_cu *cu = reader->cu;
15877 struct objfile *objfile = cu->objfile;
15878 struct partial_die_info *part_die;
15879 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15880 struct abbrev_info *abbrev;
15881 unsigned int bytes_read;
15882 unsigned int load_all = 0;
15883 int nesting_level = 1;
15888 gdb_assert (cu->per_cu != NULL);
15889 if (cu->per_cu->load_all_dies)
15893 = htab_create_alloc_ex (cu->header.length / 12,
15897 &cu->comp_unit_obstack,
15898 hashtab_obstack_allocate,
15899 dummy_obstack_deallocate);
15901 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
15905 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15907 /* A NULL abbrev means the end of a series of children. */
15908 if (abbrev == NULL)
15910 if (--nesting_level == 0)
15912 /* PART_DIE was probably the last thing allocated on the
15913 comp_unit_obstack, so we could call obstack_free
15914 here. We don't do that because the waste is small,
15915 and will be cleaned up when we're done with this
15916 compilation unit. This way, we're also more robust
15917 against other users of the comp_unit_obstack. */
15920 info_ptr += bytes_read;
15921 last_die = parent_die;
15922 parent_die = parent_die->die_parent;
15926 /* Check for template arguments. We never save these; if
15927 they're seen, we just mark the parent, and go on our way. */
15928 if (parent_die != NULL
15929 && cu->language == language_cplus
15930 && (abbrev->tag == DW_TAG_template_type_param
15931 || abbrev->tag == DW_TAG_template_value_param))
15933 parent_die->has_template_arguments = 1;
15937 /* We don't need a partial DIE for the template argument. */
15938 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15943 /* We only recurse into c++ subprograms looking for template arguments.
15944 Skip their other children. */
15946 && cu->language == language_cplus
15947 && parent_die != NULL
15948 && parent_die->tag == DW_TAG_subprogram)
15950 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15954 /* Check whether this DIE is interesting enough to save. Normally
15955 we would not be interested in members here, but there may be
15956 later variables referencing them via DW_AT_specification (for
15957 static members). */
15959 && !is_type_tag_for_partial (abbrev->tag)
15960 && abbrev->tag != DW_TAG_constant
15961 && abbrev->tag != DW_TAG_enumerator
15962 && abbrev->tag != DW_TAG_subprogram
15963 && abbrev->tag != DW_TAG_lexical_block
15964 && abbrev->tag != DW_TAG_variable
15965 && abbrev->tag != DW_TAG_namespace
15966 && abbrev->tag != DW_TAG_module
15967 && abbrev->tag != DW_TAG_member
15968 && abbrev->tag != DW_TAG_imported_unit
15969 && abbrev->tag != DW_TAG_imported_declaration)
15971 /* Otherwise we skip to the next sibling, if any. */
15972 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15976 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
15979 /* This two-pass algorithm for processing partial symbols has a
15980 high cost in cache pressure. Thus, handle some simple cases
15981 here which cover the majority of C partial symbols. DIEs
15982 which neither have specification tags in them, nor could have
15983 specification tags elsewhere pointing at them, can simply be
15984 processed and discarded.
15986 This segment is also optional; scan_partial_symbols and
15987 add_partial_symbol will handle these DIEs if we chain
15988 them in normally. When compilers which do not emit large
15989 quantities of duplicate debug information are more common,
15990 this code can probably be removed. */
15992 /* Any complete simple types at the top level (pretty much all
15993 of them, for a language without namespaces), can be processed
15995 if (parent_die == NULL
15996 && part_die->has_specification == 0
15997 && part_die->is_declaration == 0
15998 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
15999 || part_die->tag == DW_TAG_base_type
16000 || part_die->tag == DW_TAG_subrange_type))
16002 if (building_psymtab && part_die->name != NULL)
16003 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16004 VAR_DOMAIN, LOC_TYPEDEF,
16005 &objfile->static_psymbols,
16006 0, cu->language, objfile);
16007 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16011 /* The exception for DW_TAG_typedef with has_children above is
16012 a workaround of GCC PR debug/47510. In the case of this complaint
16013 type_name_no_tag_or_error will error on such types later.
16015 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16016 it could not find the child DIEs referenced later, this is checked
16017 above. In correct DWARF DW_TAG_typedef should have no children. */
16019 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16020 complaint (&symfile_complaints,
16021 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16022 "- DIE at 0x%x [in module %s]"),
16023 to_underlying (part_die->sect_off), objfile_name (objfile));
16025 /* If we're at the second level, and we're an enumerator, and
16026 our parent has no specification (meaning possibly lives in a
16027 namespace elsewhere), then we can add the partial symbol now
16028 instead of queueing it. */
16029 if (part_die->tag == DW_TAG_enumerator
16030 && parent_die != NULL
16031 && parent_die->die_parent == NULL
16032 && parent_die->tag == DW_TAG_enumeration_type
16033 && parent_die->has_specification == 0)
16035 if (part_die->name == NULL)
16036 complaint (&symfile_complaints,
16037 _("malformed enumerator DIE ignored"));
16038 else if (building_psymtab)
16039 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16040 VAR_DOMAIN, LOC_CONST,
16041 cu->language == language_cplus
16042 ? &objfile->global_psymbols
16043 : &objfile->static_psymbols,
16044 0, cu->language, objfile);
16046 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16050 /* We'll save this DIE so link it in. */
16051 part_die->die_parent = parent_die;
16052 part_die->die_sibling = NULL;
16053 part_die->die_child = NULL;
16055 if (last_die && last_die == parent_die)
16056 last_die->die_child = part_die;
16058 last_die->die_sibling = part_die;
16060 last_die = part_die;
16062 if (first_die == NULL)
16063 first_die = part_die;
16065 /* Maybe add the DIE to the hash table. Not all DIEs that we
16066 find interesting need to be in the hash table, because we
16067 also have the parent/sibling/child chains; only those that we
16068 might refer to by offset later during partial symbol reading.
16070 For now this means things that might have be the target of a
16071 DW_AT_specification, DW_AT_abstract_origin, or
16072 DW_AT_extension. DW_AT_extension will refer only to
16073 namespaces; DW_AT_abstract_origin refers to functions (and
16074 many things under the function DIE, but we do not recurse
16075 into function DIEs during partial symbol reading) and
16076 possibly variables as well; DW_AT_specification refers to
16077 declarations. Declarations ought to have the DW_AT_declaration
16078 flag. It happens that GCC forgets to put it in sometimes, but
16079 only for functions, not for types.
16081 Adding more things than necessary to the hash table is harmless
16082 except for the performance cost. Adding too few will result in
16083 wasted time in find_partial_die, when we reread the compilation
16084 unit with load_all_dies set. */
16087 || abbrev->tag == DW_TAG_constant
16088 || abbrev->tag == DW_TAG_subprogram
16089 || abbrev->tag == DW_TAG_variable
16090 || abbrev->tag == DW_TAG_namespace
16091 || part_die->is_declaration)
16095 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16096 to_underlying (part_die->sect_off),
16101 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16103 /* For some DIEs we want to follow their children (if any). For C
16104 we have no reason to follow the children of structures; for other
16105 languages we have to, so that we can get at method physnames
16106 to infer fully qualified class names, for DW_AT_specification,
16107 and for C++ template arguments. For C++, we also look one level
16108 inside functions to find template arguments (if the name of the
16109 function does not already contain the template arguments).
16111 For Ada, we need to scan the children of subprograms and lexical
16112 blocks as well because Ada allows the definition of nested
16113 entities that could be interesting for the debugger, such as
16114 nested subprograms for instance. */
16115 if (last_die->has_children
16117 || last_die->tag == DW_TAG_namespace
16118 || last_die->tag == DW_TAG_module
16119 || last_die->tag == DW_TAG_enumeration_type
16120 || (cu->language == language_cplus
16121 && last_die->tag == DW_TAG_subprogram
16122 && (last_die->name == NULL
16123 || strchr (last_die->name, '<') == NULL))
16124 || (cu->language != language_c
16125 && (last_die->tag == DW_TAG_class_type
16126 || last_die->tag == DW_TAG_interface_type
16127 || last_die->tag == DW_TAG_structure_type
16128 || last_die->tag == DW_TAG_union_type))
16129 || (cu->language == language_ada
16130 && (last_die->tag == DW_TAG_subprogram
16131 || last_die->tag == DW_TAG_lexical_block))))
16134 parent_die = last_die;
16138 /* Otherwise we skip to the next sibling, if any. */
16139 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16141 /* Back to the top, do it again. */
16145 /* Read a minimal amount of information into the minimal die structure. */
16147 static const gdb_byte *
16148 read_partial_die (const struct die_reader_specs *reader,
16149 struct partial_die_info *part_die,
16150 struct abbrev_info *abbrev, unsigned int abbrev_len,
16151 const gdb_byte *info_ptr)
16153 struct dwarf2_cu *cu = reader->cu;
16154 struct objfile *objfile = cu->objfile;
16155 const gdb_byte *buffer = reader->buffer;
16157 struct attribute attr;
16158 int has_low_pc_attr = 0;
16159 int has_high_pc_attr = 0;
16160 int high_pc_relative = 0;
16162 memset (part_die, 0, sizeof (struct partial_die_info));
16164 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16166 info_ptr += abbrev_len;
16168 if (abbrev == NULL)
16171 part_die->tag = abbrev->tag;
16172 part_die->has_children = abbrev->has_children;
16174 for (i = 0; i < abbrev->num_attrs; ++i)
16176 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16178 /* Store the data if it is of an attribute we want to keep in a
16179 partial symbol table. */
16183 switch (part_die->tag)
16185 case DW_TAG_compile_unit:
16186 case DW_TAG_partial_unit:
16187 case DW_TAG_type_unit:
16188 /* Compilation units have a DW_AT_name that is a filename, not
16189 a source language identifier. */
16190 case DW_TAG_enumeration_type:
16191 case DW_TAG_enumerator:
16192 /* These tags always have simple identifiers already; no need
16193 to canonicalize them. */
16194 part_die->name = DW_STRING (&attr);
16198 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16199 &objfile->per_bfd->storage_obstack);
16203 case DW_AT_linkage_name:
16204 case DW_AT_MIPS_linkage_name:
16205 /* Note that both forms of linkage name might appear. We
16206 assume they will be the same, and we only store the last
16208 if (cu->language == language_ada)
16209 part_die->name = DW_STRING (&attr);
16210 part_die->linkage_name = DW_STRING (&attr);
16213 has_low_pc_attr = 1;
16214 part_die->lowpc = attr_value_as_address (&attr);
16216 case DW_AT_high_pc:
16217 has_high_pc_attr = 1;
16218 part_die->highpc = attr_value_as_address (&attr);
16219 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16220 high_pc_relative = 1;
16222 case DW_AT_location:
16223 /* Support the .debug_loc offsets. */
16224 if (attr_form_is_block (&attr))
16226 part_die->d.locdesc = DW_BLOCK (&attr);
16228 else if (attr_form_is_section_offset (&attr))
16230 dwarf2_complex_location_expr_complaint ();
16234 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16235 "partial symbol information");
16238 case DW_AT_external:
16239 part_die->is_external = DW_UNSND (&attr);
16241 case DW_AT_declaration:
16242 part_die->is_declaration = DW_UNSND (&attr);
16245 part_die->has_type = 1;
16247 case DW_AT_abstract_origin:
16248 case DW_AT_specification:
16249 case DW_AT_extension:
16250 part_die->has_specification = 1;
16251 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
16252 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16253 || cu->per_cu->is_dwz);
16255 case DW_AT_sibling:
16256 /* Ignore absolute siblings, they might point outside of
16257 the current compile unit. */
16258 if (attr.form == DW_FORM_ref_addr)
16259 complaint (&symfile_complaints,
16260 _("ignoring absolute DW_AT_sibling"));
16263 sect_offset off = dwarf2_get_ref_die_offset (&attr);
16264 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
16266 if (sibling_ptr < info_ptr)
16267 complaint (&symfile_complaints,
16268 _("DW_AT_sibling points backwards"));
16269 else if (sibling_ptr > reader->buffer_end)
16270 dwarf2_section_buffer_overflow_complaint (reader->die_section);
16272 part_die->sibling = sibling_ptr;
16275 case DW_AT_byte_size:
16276 part_die->has_byte_size = 1;
16278 case DW_AT_const_value:
16279 part_die->has_const_value = 1;
16281 case DW_AT_calling_convention:
16282 /* DWARF doesn't provide a way to identify a program's source-level
16283 entry point. DW_AT_calling_convention attributes are only meant
16284 to describe functions' calling conventions.
16286 However, because it's a necessary piece of information in
16287 Fortran, and before DWARF 4 DW_CC_program was the only
16288 piece of debugging information whose definition refers to
16289 a 'main program' at all, several compilers marked Fortran
16290 main programs with DW_CC_program --- even when those
16291 functions use the standard calling conventions.
16293 Although DWARF now specifies a way to provide this
16294 information, we support this practice for backward
16296 if (DW_UNSND (&attr) == DW_CC_program
16297 && cu->language == language_fortran)
16298 part_die->main_subprogram = 1;
16301 if (DW_UNSND (&attr) == DW_INL_inlined
16302 || DW_UNSND (&attr) == DW_INL_declared_inlined)
16303 part_die->may_be_inlined = 1;
16307 if (part_die->tag == DW_TAG_imported_unit)
16309 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
16310 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16311 || cu->per_cu->is_dwz);
16315 case DW_AT_main_subprogram:
16316 part_die->main_subprogram = DW_UNSND (&attr);
16324 if (high_pc_relative)
16325 part_die->highpc += part_die->lowpc;
16327 if (has_low_pc_attr && has_high_pc_attr)
16329 /* When using the GNU linker, .gnu.linkonce. sections are used to
16330 eliminate duplicate copies of functions and vtables and such.
16331 The linker will arbitrarily choose one and discard the others.
16332 The AT_*_pc values for such functions refer to local labels in
16333 these sections. If the section from that file was discarded, the
16334 labels are not in the output, so the relocs get a value of 0.
16335 If this is a discarded function, mark the pc bounds as invalid,
16336 so that GDB will ignore it. */
16337 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
16339 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16341 complaint (&symfile_complaints,
16342 _("DW_AT_low_pc %s is zero "
16343 "for DIE at 0x%x [in module %s]"),
16344 paddress (gdbarch, part_die->lowpc),
16345 to_underlying (part_die->sect_off), objfile_name (objfile));
16347 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16348 else if (part_die->lowpc >= part_die->highpc)
16350 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16352 complaint (&symfile_complaints,
16353 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16354 "for DIE at 0x%x [in module %s]"),
16355 paddress (gdbarch, part_die->lowpc),
16356 paddress (gdbarch, part_die->highpc),
16357 to_underlying (part_die->sect_off),
16358 objfile_name (objfile));
16361 part_die->has_pc_info = 1;
16367 /* Find a cached partial DIE at OFFSET in CU. */
16369 static struct partial_die_info *
16370 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
16372 struct partial_die_info *lookup_die = NULL;
16373 struct partial_die_info part_die;
16375 part_die.sect_off = sect_off;
16376 lookup_die = ((struct partial_die_info *)
16377 htab_find_with_hash (cu->partial_dies, &part_die,
16378 to_underlying (sect_off)));
16383 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16384 except in the case of .debug_types DIEs which do not reference
16385 outside their CU (they do however referencing other types via
16386 DW_FORM_ref_sig8). */
16388 static struct partial_die_info *
16389 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
16391 struct objfile *objfile = cu->objfile;
16392 struct dwarf2_per_cu_data *per_cu = NULL;
16393 struct partial_die_info *pd = NULL;
16395 if (offset_in_dwz == cu->per_cu->is_dwz
16396 && offset_in_cu_p (&cu->header, sect_off))
16398 pd = find_partial_die_in_comp_unit (sect_off, cu);
16401 /* We missed recording what we needed.
16402 Load all dies and try again. */
16403 per_cu = cu->per_cu;
16407 /* TUs don't reference other CUs/TUs (except via type signatures). */
16408 if (cu->per_cu->is_debug_types)
16410 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
16411 " external reference to offset 0x%x [in module %s].\n"),
16412 to_underlying (cu->header.sect_off), to_underlying (sect_off),
16413 bfd_get_filename (objfile->obfd));
16415 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
16418 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16419 load_partial_comp_unit (per_cu);
16421 per_cu->cu->last_used = 0;
16422 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16425 /* If we didn't find it, and not all dies have been loaded,
16426 load them all and try again. */
16428 if (pd == NULL && per_cu->load_all_dies == 0)
16430 per_cu->load_all_dies = 1;
16432 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16433 THIS_CU->cu may already be in use. So we can't just free it and
16434 replace its DIEs with the ones we read in. Instead, we leave those
16435 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16436 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16438 load_partial_comp_unit (per_cu);
16440 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16444 internal_error (__FILE__, __LINE__,
16445 _("could not find partial DIE 0x%x "
16446 "in cache [from module %s]\n"),
16447 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
16451 /* See if we can figure out if the class lives in a namespace. We do
16452 this by looking for a member function; its demangled name will
16453 contain namespace info, if there is any. */
16456 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16457 struct dwarf2_cu *cu)
16459 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16460 what template types look like, because the demangler
16461 frequently doesn't give the same name as the debug info. We
16462 could fix this by only using the demangled name to get the
16463 prefix (but see comment in read_structure_type). */
16465 struct partial_die_info *real_pdi;
16466 struct partial_die_info *child_pdi;
16468 /* If this DIE (this DIE's specification, if any) has a parent, then
16469 we should not do this. We'll prepend the parent's fully qualified
16470 name when we create the partial symbol. */
16472 real_pdi = struct_pdi;
16473 while (real_pdi->has_specification)
16474 real_pdi = find_partial_die (real_pdi->spec_offset,
16475 real_pdi->spec_is_dwz, cu);
16477 if (real_pdi->die_parent != NULL)
16480 for (child_pdi = struct_pdi->die_child;
16482 child_pdi = child_pdi->die_sibling)
16484 if (child_pdi->tag == DW_TAG_subprogram
16485 && child_pdi->linkage_name != NULL)
16487 char *actual_class_name
16488 = language_class_name_from_physname (cu->language_defn,
16489 child_pdi->linkage_name);
16490 if (actual_class_name != NULL)
16494 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16496 strlen (actual_class_name)));
16497 xfree (actual_class_name);
16504 /* Adjust PART_DIE before generating a symbol for it. This function
16505 may set the is_external flag or change the DIE's name. */
16508 fixup_partial_die (struct partial_die_info *part_die,
16509 struct dwarf2_cu *cu)
16511 /* Once we've fixed up a die, there's no point in doing so again.
16512 This also avoids a memory leak if we were to call
16513 guess_partial_die_structure_name multiple times. */
16514 if (part_die->fixup_called)
16517 /* If we found a reference attribute and the DIE has no name, try
16518 to find a name in the referred to DIE. */
16520 if (part_die->name == NULL && part_die->has_specification)
16522 struct partial_die_info *spec_die;
16524 spec_die = find_partial_die (part_die->spec_offset,
16525 part_die->spec_is_dwz, cu);
16527 fixup_partial_die (spec_die, cu);
16529 if (spec_die->name)
16531 part_die->name = spec_die->name;
16533 /* Copy DW_AT_external attribute if it is set. */
16534 if (spec_die->is_external)
16535 part_die->is_external = spec_die->is_external;
16539 /* Set default names for some unnamed DIEs. */
16541 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16542 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16544 /* If there is no parent die to provide a namespace, and there are
16545 children, see if we can determine the namespace from their linkage
16547 if (cu->language == language_cplus
16548 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16549 && part_die->die_parent == NULL
16550 && part_die->has_children
16551 && (part_die->tag == DW_TAG_class_type
16552 || part_die->tag == DW_TAG_structure_type
16553 || part_die->tag == DW_TAG_union_type))
16554 guess_partial_die_structure_name (part_die, cu);
16556 /* GCC might emit a nameless struct or union that has a linkage
16557 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16558 if (part_die->name == NULL
16559 && (part_die->tag == DW_TAG_class_type
16560 || part_die->tag == DW_TAG_interface_type
16561 || part_die->tag == DW_TAG_structure_type
16562 || part_die->tag == DW_TAG_union_type)
16563 && part_die->linkage_name != NULL)
16567 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16572 /* Strip any leading namespaces/classes, keep only the base name.
16573 DW_AT_name for named DIEs does not contain the prefixes. */
16574 base = strrchr (demangled, ':');
16575 if (base && base > demangled && base[-1] == ':')
16582 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16583 base, strlen (base)));
16588 part_die->fixup_called = 1;
16591 /* Read an attribute value described by an attribute form. */
16593 static const gdb_byte *
16594 read_attribute_value (const struct die_reader_specs *reader,
16595 struct attribute *attr, unsigned form,
16596 LONGEST implicit_const, const gdb_byte *info_ptr)
16598 struct dwarf2_cu *cu = reader->cu;
16599 struct objfile *objfile = cu->objfile;
16600 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16601 bfd *abfd = reader->abfd;
16602 struct comp_unit_head *cu_header = &cu->header;
16603 unsigned int bytes_read;
16604 struct dwarf_block *blk;
16606 attr->form = (enum dwarf_form) form;
16609 case DW_FORM_ref_addr:
16610 if (cu->header.version == 2)
16611 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16613 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16614 &cu->header, &bytes_read);
16615 info_ptr += bytes_read;
16617 case DW_FORM_GNU_ref_alt:
16618 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16619 info_ptr += bytes_read;
16622 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16623 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16624 info_ptr += bytes_read;
16626 case DW_FORM_block2:
16627 blk = dwarf_alloc_block (cu);
16628 blk->size = read_2_bytes (abfd, info_ptr);
16630 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16631 info_ptr += blk->size;
16632 DW_BLOCK (attr) = blk;
16634 case DW_FORM_block4:
16635 blk = dwarf_alloc_block (cu);
16636 blk->size = read_4_bytes (abfd, info_ptr);
16638 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16639 info_ptr += blk->size;
16640 DW_BLOCK (attr) = blk;
16642 case DW_FORM_data2:
16643 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16646 case DW_FORM_data4:
16647 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16650 case DW_FORM_data8:
16651 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16654 case DW_FORM_data16:
16655 blk = dwarf_alloc_block (cu);
16657 blk->data = read_n_bytes (abfd, info_ptr, 16);
16659 DW_BLOCK (attr) = blk;
16661 case DW_FORM_sec_offset:
16662 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16663 info_ptr += bytes_read;
16665 case DW_FORM_string:
16666 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16667 DW_STRING_IS_CANONICAL (attr) = 0;
16668 info_ptr += bytes_read;
16671 if (!cu->per_cu->is_dwz)
16673 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16675 DW_STRING_IS_CANONICAL (attr) = 0;
16676 info_ptr += bytes_read;
16680 case DW_FORM_line_strp:
16681 if (!cu->per_cu->is_dwz)
16683 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
16684 cu_header, &bytes_read);
16685 DW_STRING_IS_CANONICAL (attr) = 0;
16686 info_ptr += bytes_read;
16690 case DW_FORM_GNU_strp_alt:
16692 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16693 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16696 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16697 DW_STRING_IS_CANONICAL (attr) = 0;
16698 info_ptr += bytes_read;
16701 case DW_FORM_exprloc:
16702 case DW_FORM_block:
16703 blk = dwarf_alloc_block (cu);
16704 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16705 info_ptr += bytes_read;
16706 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16707 info_ptr += blk->size;
16708 DW_BLOCK (attr) = blk;
16710 case DW_FORM_block1:
16711 blk = dwarf_alloc_block (cu);
16712 blk->size = read_1_byte (abfd, info_ptr);
16714 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16715 info_ptr += blk->size;
16716 DW_BLOCK (attr) = blk;
16718 case DW_FORM_data1:
16719 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16723 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16726 case DW_FORM_flag_present:
16727 DW_UNSND (attr) = 1;
16729 case DW_FORM_sdata:
16730 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16731 info_ptr += bytes_read;
16733 case DW_FORM_udata:
16734 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16735 info_ptr += bytes_read;
16738 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16739 + read_1_byte (abfd, info_ptr));
16743 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16744 + read_2_bytes (abfd, info_ptr));
16748 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16749 + read_4_bytes (abfd, info_ptr));
16753 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16754 + read_8_bytes (abfd, info_ptr));
16757 case DW_FORM_ref_sig8:
16758 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16761 case DW_FORM_ref_udata:
16762 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16763 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16764 info_ptr += bytes_read;
16766 case DW_FORM_indirect:
16767 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16768 info_ptr += bytes_read;
16769 if (form == DW_FORM_implicit_const)
16771 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16772 info_ptr += bytes_read;
16774 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
16777 case DW_FORM_implicit_const:
16778 DW_SND (attr) = implicit_const;
16780 case DW_FORM_GNU_addr_index:
16781 if (reader->dwo_file == NULL)
16783 /* For now flag a hard error.
16784 Later we can turn this into a complaint. */
16785 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16786 dwarf_form_name (form),
16787 bfd_get_filename (abfd));
16789 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16790 info_ptr += bytes_read;
16792 case DW_FORM_GNU_str_index:
16793 if (reader->dwo_file == NULL)
16795 /* For now flag a hard error.
16796 Later we can turn this into a complaint if warranted. */
16797 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16798 dwarf_form_name (form),
16799 bfd_get_filename (abfd));
16802 ULONGEST str_index =
16803 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16805 DW_STRING (attr) = read_str_index (reader, str_index);
16806 DW_STRING_IS_CANONICAL (attr) = 0;
16807 info_ptr += bytes_read;
16811 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16812 dwarf_form_name (form),
16813 bfd_get_filename (abfd));
16817 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16818 attr->form = DW_FORM_GNU_ref_alt;
16820 /* We have seen instances where the compiler tried to emit a byte
16821 size attribute of -1 which ended up being encoded as an unsigned
16822 0xffffffff. Although 0xffffffff is technically a valid size value,
16823 an object of this size seems pretty unlikely so we can relatively
16824 safely treat these cases as if the size attribute was invalid and
16825 treat them as zero by default. */
16826 if (attr->name == DW_AT_byte_size
16827 && form == DW_FORM_data4
16828 && DW_UNSND (attr) >= 0xffffffff)
16831 (&symfile_complaints,
16832 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16833 hex_string (DW_UNSND (attr)));
16834 DW_UNSND (attr) = 0;
16840 /* Read an attribute described by an abbreviated attribute. */
16842 static const gdb_byte *
16843 read_attribute (const struct die_reader_specs *reader,
16844 struct attribute *attr, struct attr_abbrev *abbrev,
16845 const gdb_byte *info_ptr)
16847 attr->name = abbrev->name;
16848 return read_attribute_value (reader, attr, abbrev->form,
16849 abbrev->implicit_const, info_ptr);
16852 /* Read dwarf information from a buffer. */
16854 static unsigned int
16855 read_1_byte (bfd *abfd, const gdb_byte *buf)
16857 return bfd_get_8 (abfd, buf);
16861 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
16863 return bfd_get_signed_8 (abfd, buf);
16866 static unsigned int
16867 read_2_bytes (bfd *abfd, const gdb_byte *buf)
16869 return bfd_get_16 (abfd, buf);
16873 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16875 return bfd_get_signed_16 (abfd, buf);
16878 static unsigned int
16879 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16881 return bfd_get_32 (abfd, buf);
16885 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16887 return bfd_get_signed_32 (abfd, buf);
16891 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16893 return bfd_get_64 (abfd, buf);
16897 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16898 unsigned int *bytes_read)
16900 struct comp_unit_head *cu_header = &cu->header;
16901 CORE_ADDR retval = 0;
16903 if (cu_header->signed_addr_p)
16905 switch (cu_header->addr_size)
16908 retval = bfd_get_signed_16 (abfd, buf);
16911 retval = bfd_get_signed_32 (abfd, buf);
16914 retval = bfd_get_signed_64 (abfd, buf);
16917 internal_error (__FILE__, __LINE__,
16918 _("read_address: bad switch, signed [in module %s]"),
16919 bfd_get_filename (abfd));
16924 switch (cu_header->addr_size)
16927 retval = bfd_get_16 (abfd, buf);
16930 retval = bfd_get_32 (abfd, buf);
16933 retval = bfd_get_64 (abfd, buf);
16936 internal_error (__FILE__, __LINE__,
16937 _("read_address: bad switch, "
16938 "unsigned [in module %s]"),
16939 bfd_get_filename (abfd));
16943 *bytes_read = cu_header->addr_size;
16947 /* Read the initial length from a section. The (draft) DWARF 3
16948 specification allows the initial length to take up either 4 bytes
16949 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
16950 bytes describe the length and all offsets will be 8 bytes in length
16953 An older, non-standard 64-bit format is also handled by this
16954 function. The older format in question stores the initial length
16955 as an 8-byte quantity without an escape value. Lengths greater
16956 than 2^32 aren't very common which means that the initial 4 bytes
16957 is almost always zero. Since a length value of zero doesn't make
16958 sense for the 32-bit format, this initial zero can be considered to
16959 be an escape value which indicates the presence of the older 64-bit
16960 format. As written, the code can't detect (old format) lengths
16961 greater than 4GB. If it becomes necessary to handle lengths
16962 somewhat larger than 4GB, we could allow other small values (such
16963 as the non-sensical values of 1, 2, and 3) to also be used as
16964 escape values indicating the presence of the old format.
16966 The value returned via bytes_read should be used to increment the
16967 relevant pointer after calling read_initial_length().
16969 [ Note: read_initial_length() and read_offset() are based on the
16970 document entitled "DWARF Debugging Information Format", revision
16971 3, draft 8, dated November 19, 2001. This document was obtained
16974 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
16976 This document is only a draft and is subject to change. (So beware.)
16978 Details regarding the older, non-standard 64-bit format were
16979 determined empirically by examining 64-bit ELF files produced by
16980 the SGI toolchain on an IRIX 6.5 machine.
16982 - Kevin, July 16, 2002
16986 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
16988 LONGEST length = bfd_get_32 (abfd, buf);
16990 if (length == 0xffffffff)
16992 length = bfd_get_64 (abfd, buf + 4);
16995 else if (length == 0)
16997 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
16998 length = bfd_get_64 (abfd, buf);
17009 /* Cover function for read_initial_length.
17010 Returns the length of the object at BUF, and stores the size of the
17011 initial length in *BYTES_READ and stores the size that offsets will be in
17013 If the initial length size is not equivalent to that specified in
17014 CU_HEADER then issue a complaint.
17015 This is useful when reading non-comp-unit headers. */
17018 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17019 const struct comp_unit_head *cu_header,
17020 unsigned int *bytes_read,
17021 unsigned int *offset_size)
17023 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17025 gdb_assert (cu_header->initial_length_size == 4
17026 || cu_header->initial_length_size == 8
17027 || cu_header->initial_length_size == 12);
17029 if (cu_header->initial_length_size != *bytes_read)
17030 complaint (&symfile_complaints,
17031 _("intermixed 32-bit and 64-bit DWARF sections"));
17033 *offset_size = (*bytes_read == 4) ? 4 : 8;
17037 /* Read an offset from the data stream. The size of the offset is
17038 given by cu_header->offset_size. */
17041 read_offset (bfd *abfd, const gdb_byte *buf,
17042 const struct comp_unit_head *cu_header,
17043 unsigned int *bytes_read)
17045 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17047 *bytes_read = cu_header->offset_size;
17051 /* Read an offset from the data stream. */
17054 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17056 LONGEST retval = 0;
17058 switch (offset_size)
17061 retval = bfd_get_32 (abfd, buf);
17064 retval = bfd_get_64 (abfd, buf);
17067 internal_error (__FILE__, __LINE__,
17068 _("read_offset_1: bad switch [in module %s]"),
17069 bfd_get_filename (abfd));
17075 static const gdb_byte *
17076 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17078 /* If the size of a host char is 8 bits, we can return a pointer
17079 to the buffer, otherwise we have to copy the data to a buffer
17080 allocated on the temporary obstack. */
17081 gdb_assert (HOST_CHAR_BIT == 8);
17085 static const char *
17086 read_direct_string (bfd *abfd, const gdb_byte *buf,
17087 unsigned int *bytes_read_ptr)
17089 /* If the size of a host char is 8 bits, we can return a pointer
17090 to the string, otherwise we have to copy the string to a buffer
17091 allocated on the temporary obstack. */
17092 gdb_assert (HOST_CHAR_BIT == 8);
17095 *bytes_read_ptr = 1;
17098 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17099 return (const char *) buf;
17102 /* Return pointer to string at section SECT offset STR_OFFSET with error
17103 reporting strings FORM_NAME and SECT_NAME. */
17105 static const char *
17106 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17107 struct dwarf2_section_info *sect,
17108 const char *form_name,
17109 const char *sect_name)
17111 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17112 if (sect->buffer == NULL)
17113 error (_("%s used without %s section [in module %s]"),
17114 form_name, sect_name, bfd_get_filename (abfd));
17115 if (str_offset >= sect->size)
17116 error (_("%s pointing outside of %s section [in module %s]"),
17117 form_name, sect_name, bfd_get_filename (abfd));
17118 gdb_assert (HOST_CHAR_BIT == 8);
17119 if (sect->buffer[str_offset] == '\0')
17121 return (const char *) (sect->buffer + str_offset);
17124 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17126 static const char *
17127 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17129 return read_indirect_string_at_offset_from (abfd, str_offset,
17130 &dwarf2_per_objfile->str,
17131 "DW_FORM_strp", ".debug_str");
17134 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17136 static const char *
17137 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17139 return read_indirect_string_at_offset_from (abfd, str_offset,
17140 &dwarf2_per_objfile->line_str,
17141 "DW_FORM_line_strp",
17142 ".debug_line_str");
17145 /* Read a string at offset STR_OFFSET in the .debug_str section from
17146 the .dwz file DWZ. Throw an error if the offset is too large. If
17147 the string consists of a single NUL byte, return NULL; otherwise
17148 return a pointer to the string. */
17150 static const char *
17151 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17153 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17155 if (dwz->str.buffer == NULL)
17156 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17157 "section [in module %s]"),
17158 bfd_get_filename (dwz->dwz_bfd));
17159 if (str_offset >= dwz->str.size)
17160 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17161 ".debug_str section [in module %s]"),
17162 bfd_get_filename (dwz->dwz_bfd));
17163 gdb_assert (HOST_CHAR_BIT == 8);
17164 if (dwz->str.buffer[str_offset] == '\0')
17166 return (const char *) (dwz->str.buffer + str_offset);
17169 /* Return pointer to string at .debug_str offset as read from BUF.
17170 BUF is assumed to be in a compilation unit described by CU_HEADER.
17171 Return *BYTES_READ_PTR count of bytes read from BUF. */
17173 static const char *
17174 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17175 const struct comp_unit_head *cu_header,
17176 unsigned int *bytes_read_ptr)
17178 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17180 return read_indirect_string_at_offset (abfd, str_offset);
17183 /* Return pointer to string at .debug_line_str offset as read from BUF.
17184 BUF is assumed to be in a compilation unit described by CU_HEADER.
17185 Return *BYTES_READ_PTR count of bytes read from BUF. */
17187 static const char *
17188 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17189 const struct comp_unit_head *cu_header,
17190 unsigned int *bytes_read_ptr)
17192 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17194 return read_indirect_line_string_at_offset (abfd, str_offset);
17198 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17199 unsigned int *bytes_read_ptr)
17202 unsigned int num_read;
17204 unsigned char byte;
17211 byte = bfd_get_8 (abfd, buf);
17214 result |= ((ULONGEST) (byte & 127) << shift);
17215 if ((byte & 128) == 0)
17221 *bytes_read_ptr = num_read;
17226 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17227 unsigned int *bytes_read_ptr)
17230 int shift, num_read;
17231 unsigned char byte;
17238 byte = bfd_get_8 (abfd, buf);
17241 result |= ((LONGEST) (byte & 127) << shift);
17243 if ((byte & 128) == 0)
17248 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
17249 result |= -(((LONGEST) 1) << shift);
17250 *bytes_read_ptr = num_read;
17254 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
17255 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
17256 ADDR_SIZE is the size of addresses from the CU header. */
17259 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
17261 struct objfile *objfile = dwarf2_per_objfile->objfile;
17262 bfd *abfd = objfile->obfd;
17263 const gdb_byte *info_ptr;
17265 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
17266 if (dwarf2_per_objfile->addr.buffer == NULL)
17267 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
17268 objfile_name (objfile));
17269 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
17270 error (_("DW_FORM_addr_index pointing outside of "
17271 ".debug_addr section [in module %s]"),
17272 objfile_name (objfile));
17273 info_ptr = (dwarf2_per_objfile->addr.buffer
17274 + addr_base + addr_index * addr_size);
17275 if (addr_size == 4)
17276 return bfd_get_32 (abfd, info_ptr);
17278 return bfd_get_64 (abfd, info_ptr);
17281 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
17284 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
17286 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
17289 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
17292 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
17293 unsigned int *bytes_read)
17295 bfd *abfd = cu->objfile->obfd;
17296 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
17298 return read_addr_index (cu, addr_index);
17301 /* Data structure to pass results from dwarf2_read_addr_index_reader
17302 back to dwarf2_read_addr_index. */
17304 struct dwarf2_read_addr_index_data
17306 ULONGEST addr_base;
17310 /* die_reader_func for dwarf2_read_addr_index. */
17313 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
17314 const gdb_byte *info_ptr,
17315 struct die_info *comp_unit_die,
17319 struct dwarf2_cu *cu = reader->cu;
17320 struct dwarf2_read_addr_index_data *aidata =
17321 (struct dwarf2_read_addr_index_data *) data;
17323 aidata->addr_base = cu->addr_base;
17324 aidata->addr_size = cu->header.addr_size;
17327 /* Given an index in .debug_addr, fetch the value.
17328 NOTE: This can be called during dwarf expression evaluation,
17329 long after the debug information has been read, and thus per_cu->cu
17330 may no longer exist. */
17333 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
17334 unsigned int addr_index)
17336 struct objfile *objfile = per_cu->objfile;
17337 struct dwarf2_cu *cu = per_cu->cu;
17338 ULONGEST addr_base;
17341 /* This is intended to be called from outside this file. */
17342 dw2_setup (objfile);
17344 /* We need addr_base and addr_size.
17345 If we don't have PER_CU->cu, we have to get it.
17346 Nasty, but the alternative is storing the needed info in PER_CU,
17347 which at this point doesn't seem justified: it's not clear how frequently
17348 it would get used and it would increase the size of every PER_CU.
17349 Entry points like dwarf2_per_cu_addr_size do a similar thing
17350 so we're not in uncharted territory here.
17351 Alas we need to be a bit more complicated as addr_base is contained
17354 We don't need to read the entire CU(/TU).
17355 We just need the header and top level die.
17357 IWBN to use the aging mechanism to let us lazily later discard the CU.
17358 For now we skip this optimization. */
17362 addr_base = cu->addr_base;
17363 addr_size = cu->header.addr_size;
17367 struct dwarf2_read_addr_index_data aidata;
17369 /* Note: We can't use init_cutu_and_read_dies_simple here,
17370 we need addr_base. */
17371 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
17372 dwarf2_read_addr_index_reader, &aidata);
17373 addr_base = aidata.addr_base;
17374 addr_size = aidata.addr_size;
17377 return read_addr_index_1 (addr_index, addr_base, addr_size);
17380 /* Given a DW_FORM_GNU_str_index, fetch the string.
17381 This is only used by the Fission support. */
17383 static const char *
17384 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
17386 struct objfile *objfile = dwarf2_per_objfile->objfile;
17387 const char *objf_name = objfile_name (objfile);
17388 bfd *abfd = objfile->obfd;
17389 struct dwarf2_cu *cu = reader->cu;
17390 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
17391 struct dwarf2_section_info *str_offsets_section =
17392 &reader->dwo_file->sections.str_offsets;
17393 const gdb_byte *info_ptr;
17394 ULONGEST str_offset;
17395 static const char form_name[] = "DW_FORM_GNU_str_index";
17397 dwarf2_read_section (objfile, str_section);
17398 dwarf2_read_section (objfile, str_offsets_section);
17399 if (str_section->buffer == NULL)
17400 error (_("%s used without .debug_str.dwo section"
17401 " in CU at offset 0x%x [in module %s]"),
17402 form_name, to_underlying (cu->header.sect_off), objf_name);
17403 if (str_offsets_section->buffer == NULL)
17404 error (_("%s used without .debug_str_offsets.dwo section"
17405 " in CU at offset 0x%x [in module %s]"),
17406 form_name, to_underlying (cu->header.sect_off), objf_name);
17407 if (str_index * cu->header.offset_size >= str_offsets_section->size)
17408 error (_("%s pointing outside of .debug_str_offsets.dwo"
17409 " section in CU at offset 0x%x [in module %s]"),
17410 form_name, to_underlying (cu->header.sect_off), objf_name);
17411 info_ptr = (str_offsets_section->buffer
17412 + str_index * cu->header.offset_size);
17413 if (cu->header.offset_size == 4)
17414 str_offset = bfd_get_32 (abfd, info_ptr);
17416 str_offset = bfd_get_64 (abfd, info_ptr);
17417 if (str_offset >= str_section->size)
17418 error (_("Offset from %s pointing outside of"
17419 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
17420 form_name, to_underlying (cu->header.sect_off), objf_name);
17421 return (const char *) (str_section->buffer + str_offset);
17424 /* Return the length of an LEB128 number in BUF. */
17427 leb128_size (const gdb_byte *buf)
17429 const gdb_byte *begin = buf;
17435 if ((byte & 128) == 0)
17436 return buf - begin;
17441 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17450 cu->language = language_c;
17453 case DW_LANG_C_plus_plus:
17454 case DW_LANG_C_plus_plus_11:
17455 case DW_LANG_C_plus_plus_14:
17456 cu->language = language_cplus;
17459 cu->language = language_d;
17461 case DW_LANG_Fortran77:
17462 case DW_LANG_Fortran90:
17463 case DW_LANG_Fortran95:
17464 case DW_LANG_Fortran03:
17465 case DW_LANG_Fortran08:
17466 cu->language = language_fortran;
17469 cu->language = language_go;
17471 case DW_LANG_Mips_Assembler:
17472 cu->language = language_asm;
17474 case DW_LANG_Ada83:
17475 case DW_LANG_Ada95:
17476 cu->language = language_ada;
17478 case DW_LANG_Modula2:
17479 cu->language = language_m2;
17481 case DW_LANG_Pascal83:
17482 cu->language = language_pascal;
17485 cu->language = language_objc;
17488 case DW_LANG_Rust_old:
17489 cu->language = language_rust;
17491 case DW_LANG_Cobol74:
17492 case DW_LANG_Cobol85:
17494 cu->language = language_minimal;
17497 cu->language_defn = language_def (cu->language);
17500 /* Return the named attribute or NULL if not there. */
17502 static struct attribute *
17503 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17508 struct attribute *spec = NULL;
17510 for (i = 0; i < die->num_attrs; ++i)
17512 if (die->attrs[i].name == name)
17513 return &die->attrs[i];
17514 if (die->attrs[i].name == DW_AT_specification
17515 || die->attrs[i].name == DW_AT_abstract_origin)
17516 spec = &die->attrs[i];
17522 die = follow_die_ref (die, spec, &cu);
17528 /* Return the named attribute or NULL if not there,
17529 but do not follow DW_AT_specification, etc.
17530 This is for use in contexts where we're reading .debug_types dies.
17531 Following DW_AT_specification, DW_AT_abstract_origin will take us
17532 back up the chain, and we want to go down. */
17534 static struct attribute *
17535 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17539 for (i = 0; i < die->num_attrs; ++i)
17540 if (die->attrs[i].name == name)
17541 return &die->attrs[i];
17546 /* Return the string associated with a string-typed attribute, or NULL if it
17547 is either not found or is of an incorrect type. */
17549 static const char *
17550 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17552 struct attribute *attr;
17553 const char *str = NULL;
17555 attr = dwarf2_attr (die, name, cu);
17559 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
17560 || attr->form == DW_FORM_string || attr->form == DW_FORM_GNU_strp_alt)
17561 str = DW_STRING (attr);
17563 complaint (&symfile_complaints,
17564 _("string type expected for attribute %s for "
17565 "DIE at 0x%x in module %s"),
17566 dwarf_attr_name (name), to_underlying (die->sect_off),
17567 objfile_name (cu->objfile));
17573 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17574 and holds a non-zero value. This function should only be used for
17575 DW_FORM_flag or DW_FORM_flag_present attributes. */
17578 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17580 struct attribute *attr = dwarf2_attr (die, name, cu);
17582 return (attr && DW_UNSND (attr));
17586 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17588 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17589 which value is non-zero. However, we have to be careful with
17590 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17591 (via dwarf2_flag_true_p) follows this attribute. So we may
17592 end up accidently finding a declaration attribute that belongs
17593 to a different DIE referenced by the specification attribute,
17594 even though the given DIE does not have a declaration attribute. */
17595 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17596 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17599 /* Return the die giving the specification for DIE, if there is
17600 one. *SPEC_CU is the CU containing DIE on input, and the CU
17601 containing the return value on output. If there is no
17602 specification, but there is an abstract origin, that is
17605 static struct die_info *
17606 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17608 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17611 if (spec_attr == NULL)
17612 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17614 if (spec_attr == NULL)
17617 return follow_die_ref (die, spec_attr, spec_cu);
17620 /* Stub for free_line_header to match void * callback types. */
17623 free_line_header_voidp (void *arg)
17625 struct line_header *lh = (struct line_header *) arg;
17631 line_header::add_include_dir (const char *include_dir)
17633 if (dwarf_line_debug >= 2)
17634 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
17635 include_dirs.size () + 1, include_dir);
17637 include_dirs.push_back (include_dir);
17641 line_header::add_file_name (const char *name,
17643 unsigned int mod_time,
17644 unsigned int length)
17646 if (dwarf_line_debug >= 2)
17647 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17648 (unsigned) file_names.size () + 1, name);
17650 file_names.emplace_back (name, d_index, mod_time, length);
17653 /* A convenience function to find the proper .debug_line section for a CU. */
17655 static struct dwarf2_section_info *
17656 get_debug_line_section (struct dwarf2_cu *cu)
17658 struct dwarf2_section_info *section;
17660 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17662 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17663 section = &cu->dwo_unit->dwo_file->sections.line;
17664 else if (cu->per_cu->is_dwz)
17666 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17668 section = &dwz->line;
17671 section = &dwarf2_per_objfile->line;
17676 /* Read directory or file name entry format, starting with byte of
17677 format count entries, ULEB128 pairs of entry formats, ULEB128 of
17678 entries count and the entries themselves in the described entry
17682 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
17683 struct line_header *lh,
17684 const struct comp_unit_head *cu_header,
17685 void (*callback) (struct line_header *lh,
17688 unsigned int mod_time,
17689 unsigned int length))
17691 gdb_byte format_count, formati;
17692 ULONGEST data_count, datai;
17693 const gdb_byte *buf = *bufp;
17694 const gdb_byte *format_header_data;
17696 unsigned int bytes_read;
17698 format_count = read_1_byte (abfd, buf);
17700 format_header_data = buf;
17701 for (formati = 0; formati < format_count; formati++)
17703 read_unsigned_leb128 (abfd, buf, &bytes_read);
17705 read_unsigned_leb128 (abfd, buf, &bytes_read);
17709 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
17711 for (datai = 0; datai < data_count; datai++)
17713 const gdb_byte *format = format_header_data;
17714 struct file_entry fe;
17716 for (formati = 0; formati < format_count; formati++)
17718 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
17719 format += bytes_read;
17721 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
17722 format += bytes_read;
17724 gdb::optional<const char *> string;
17725 gdb::optional<unsigned int> uint;
17729 case DW_FORM_string:
17730 string.emplace (read_direct_string (abfd, buf, &bytes_read));
17734 case DW_FORM_line_strp:
17735 string.emplace (read_indirect_line_string (abfd, buf,
17741 case DW_FORM_data1:
17742 uint.emplace (read_1_byte (abfd, buf));
17746 case DW_FORM_data2:
17747 uint.emplace (read_2_bytes (abfd, buf));
17751 case DW_FORM_data4:
17752 uint.emplace (read_4_bytes (abfd, buf));
17756 case DW_FORM_data8:
17757 uint.emplace (read_8_bytes (abfd, buf));
17761 case DW_FORM_udata:
17762 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
17766 case DW_FORM_block:
17767 /* It is valid only for DW_LNCT_timestamp which is ignored by
17772 switch (content_type)
17775 if (string.has_value ())
17778 case DW_LNCT_directory_index:
17779 if (uint.has_value ())
17780 fe.d_index = (dir_index) *uint;
17782 case DW_LNCT_timestamp:
17783 if (uint.has_value ())
17784 fe.mod_time = *uint;
17787 if (uint.has_value ())
17793 complaint (&symfile_complaints,
17794 _("Unknown format content type %s"),
17795 pulongest (content_type));
17799 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
17805 /* Read the statement program header starting at OFFSET in
17806 .debug_line, or .debug_line.dwo. Return a pointer
17807 to a struct line_header, allocated using xmalloc.
17808 Returns NULL if there is a problem reading the header, e.g., if it
17809 has a version we don't understand.
17811 NOTE: the strings in the include directory and file name tables of
17812 the returned object point into the dwarf line section buffer,
17813 and must not be freed. */
17815 static line_header_up
17816 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
17818 const gdb_byte *line_ptr;
17819 unsigned int bytes_read, offset_size;
17821 const char *cur_dir, *cur_file;
17822 struct dwarf2_section_info *section;
17825 section = get_debug_line_section (cu);
17826 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
17827 if (section->buffer == NULL)
17829 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17830 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
17832 complaint (&symfile_complaints, _("missing .debug_line section"));
17836 /* We can't do this until we know the section is non-empty.
17837 Only then do we know we have such a section. */
17838 abfd = get_section_bfd_owner (section);
17840 /* Make sure that at least there's room for the total_length field.
17841 That could be 12 bytes long, but we're just going to fudge that. */
17842 if (to_underlying (sect_off) + 4 >= section->size)
17844 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17848 line_header_up lh (new line_header ());
17850 lh->sect_off = sect_off;
17851 lh->offset_in_dwz = cu->per_cu->is_dwz;
17853 line_ptr = section->buffer + to_underlying (sect_off);
17855 /* Read in the header. */
17857 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
17858 &bytes_read, &offset_size);
17859 line_ptr += bytes_read;
17860 if (line_ptr + lh->total_length > (section->buffer + section->size))
17862 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17865 lh->statement_program_end = line_ptr + lh->total_length;
17866 lh->version = read_2_bytes (abfd, line_ptr);
17868 if (lh->version > 5)
17870 /* This is a version we don't understand. The format could have
17871 changed in ways we don't handle properly so just punt. */
17872 complaint (&symfile_complaints,
17873 _("unsupported version in .debug_line section"));
17876 if (lh->version >= 5)
17878 gdb_byte segment_selector_size;
17880 /* Skip address size. */
17881 read_1_byte (abfd, line_ptr);
17884 segment_selector_size = read_1_byte (abfd, line_ptr);
17886 if (segment_selector_size != 0)
17888 complaint (&symfile_complaints,
17889 _("unsupported segment selector size %u "
17890 "in .debug_line section"),
17891 segment_selector_size);
17895 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
17896 line_ptr += offset_size;
17897 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
17899 if (lh->version >= 4)
17901 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
17905 lh->maximum_ops_per_instruction = 1;
17907 if (lh->maximum_ops_per_instruction == 0)
17909 lh->maximum_ops_per_instruction = 1;
17910 complaint (&symfile_complaints,
17911 _("invalid maximum_ops_per_instruction "
17912 "in `.debug_line' section"));
17915 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
17917 lh->line_base = read_1_signed_byte (abfd, line_ptr);
17919 lh->line_range = read_1_byte (abfd, line_ptr);
17921 lh->opcode_base = read_1_byte (abfd, line_ptr);
17923 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
17925 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
17926 for (i = 1; i < lh->opcode_base; ++i)
17928 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
17932 if (lh->version >= 5)
17934 /* Read directory table. */
17935 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
17936 [] (struct line_header *lh, const char *name,
17937 dir_index d_index, unsigned int mod_time,
17938 unsigned int length)
17940 lh->add_include_dir (name);
17943 /* Read file name table. */
17944 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
17945 [] (struct line_header *lh, const char *name,
17946 dir_index d_index, unsigned int mod_time,
17947 unsigned int length)
17949 lh->add_file_name (name, d_index, mod_time, length);
17954 /* Read directory table. */
17955 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
17957 line_ptr += bytes_read;
17958 lh->add_include_dir (cur_dir);
17960 line_ptr += bytes_read;
17962 /* Read file name table. */
17963 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
17965 unsigned int mod_time, length;
17968 line_ptr += bytes_read;
17969 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17970 line_ptr += bytes_read;
17971 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17972 line_ptr += bytes_read;
17973 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17974 line_ptr += bytes_read;
17976 lh->add_file_name (cur_file, d_index, mod_time, length);
17978 line_ptr += bytes_read;
17980 lh->statement_program_start = line_ptr;
17982 if (line_ptr > (section->buffer + section->size))
17983 complaint (&symfile_complaints,
17984 _("line number info header doesn't "
17985 "fit in `.debug_line' section"));
17990 /* Subroutine of dwarf_decode_lines to simplify it.
17991 Return the file name of the psymtab for included file FILE_INDEX
17992 in line header LH of PST.
17993 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
17994 If space for the result is malloc'd, it will be freed by a cleanup.
17995 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
17997 The function creates dangling cleanup registration. */
17999 static const char *
18000 psymtab_include_file_name (const struct line_header *lh, int file_index,
18001 const struct partial_symtab *pst,
18002 const char *comp_dir)
18004 const file_entry &fe = lh->file_names[file_index];
18005 const char *include_name = fe.name;
18006 const char *include_name_to_compare = include_name;
18007 const char *pst_filename;
18008 char *copied_name = NULL;
18011 const char *dir_name = fe.include_dir (lh);
18013 if (!IS_ABSOLUTE_PATH (include_name)
18014 && (dir_name != NULL || comp_dir != NULL))
18016 /* Avoid creating a duplicate psymtab for PST.
18017 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18018 Before we do the comparison, however, we need to account
18019 for DIR_NAME and COMP_DIR.
18020 First prepend dir_name (if non-NULL). If we still don't
18021 have an absolute path prepend comp_dir (if non-NULL).
18022 However, the directory we record in the include-file's
18023 psymtab does not contain COMP_DIR (to match the
18024 corresponding symtab(s)).
18029 bash$ gcc -g ./hello.c
18030 include_name = "hello.c"
18032 DW_AT_comp_dir = comp_dir = "/tmp"
18033 DW_AT_name = "./hello.c"
18037 if (dir_name != NULL)
18039 char *tem = concat (dir_name, SLASH_STRING,
18040 include_name, (char *)NULL);
18042 make_cleanup (xfree, tem);
18043 include_name = tem;
18044 include_name_to_compare = include_name;
18046 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18048 char *tem = concat (comp_dir, SLASH_STRING,
18049 include_name, (char *)NULL);
18051 make_cleanup (xfree, tem);
18052 include_name_to_compare = tem;
18056 pst_filename = pst->filename;
18057 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18059 copied_name = concat (pst->dirname, SLASH_STRING,
18060 pst_filename, (char *)NULL);
18061 pst_filename = copied_name;
18064 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18066 if (copied_name != NULL)
18067 xfree (copied_name);
18071 return include_name;
18074 /* State machine to track the state of the line number program. */
18076 class lnp_state_machine
18079 /* Initialize a machine state for the start of a line number
18081 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18083 file_entry *current_file ()
18085 /* lh->file_names is 0-based, but the file name numbers in the
18086 statement program are 1-based. */
18087 return m_line_header->file_name_at (m_file);
18090 /* Record the line in the state machine. END_SEQUENCE is true if
18091 we're processing the end of a sequence. */
18092 void record_line (bool end_sequence);
18094 /* Check address and if invalid nop-out the rest of the lines in this
18096 void check_line_address (struct dwarf2_cu *cu,
18097 const gdb_byte *line_ptr,
18098 CORE_ADDR lowpc, CORE_ADDR address);
18100 void handle_set_discriminator (unsigned int discriminator)
18102 m_discriminator = discriminator;
18103 m_line_has_non_zero_discriminator |= discriminator != 0;
18106 /* Handle DW_LNE_set_address. */
18107 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18110 address += baseaddr;
18111 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18114 /* Handle DW_LNS_advance_pc. */
18115 void handle_advance_pc (CORE_ADDR adjust);
18117 /* Handle a special opcode. */
18118 void handle_special_opcode (unsigned char op_code);
18120 /* Handle DW_LNS_advance_line. */
18121 void handle_advance_line (int line_delta)
18123 advance_line (line_delta);
18126 /* Handle DW_LNS_set_file. */
18127 void handle_set_file (file_name_index file);
18129 /* Handle DW_LNS_negate_stmt. */
18130 void handle_negate_stmt ()
18132 m_is_stmt = !m_is_stmt;
18135 /* Handle DW_LNS_const_add_pc. */
18136 void handle_const_add_pc ();
18138 /* Handle DW_LNS_fixed_advance_pc. */
18139 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18141 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18145 /* Handle DW_LNS_copy. */
18146 void handle_copy ()
18148 record_line (false);
18149 m_discriminator = 0;
18152 /* Handle DW_LNE_end_sequence. */
18153 void handle_end_sequence ()
18155 m_record_line_callback = ::record_line;
18159 /* Advance the line by LINE_DELTA. */
18160 void advance_line (int line_delta)
18162 m_line += line_delta;
18164 if (line_delta != 0)
18165 m_line_has_non_zero_discriminator = m_discriminator != 0;
18168 gdbarch *m_gdbarch;
18170 /* True if we're recording lines.
18171 Otherwise we're building partial symtabs and are just interested in
18172 finding include files mentioned by the line number program. */
18173 bool m_record_lines_p;
18175 /* The line number header. */
18176 line_header *m_line_header;
18178 /* These are part of the standard DWARF line number state machine,
18179 and initialized according to the DWARF spec. */
18181 unsigned char m_op_index = 0;
18182 /* The line table index (1-based) of the current file. */
18183 file_name_index m_file = (file_name_index) 1;
18184 unsigned int m_line = 1;
18186 /* These are initialized in the constructor. */
18188 CORE_ADDR m_address;
18190 unsigned int m_discriminator;
18192 /* Additional bits of state we need to track. */
18194 /* The last file that we called dwarf2_start_subfile for.
18195 This is only used for TLLs. */
18196 unsigned int m_last_file = 0;
18197 /* The last file a line number was recorded for. */
18198 struct subfile *m_last_subfile = NULL;
18200 /* The function to call to record a line. */
18201 record_line_ftype *m_record_line_callback = NULL;
18203 /* The last line number that was recorded, used to coalesce
18204 consecutive entries for the same line. This can happen, for
18205 example, when discriminators are present. PR 17276. */
18206 unsigned int m_last_line = 0;
18207 bool m_line_has_non_zero_discriminator = false;
18211 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18213 CORE_ADDR addr_adj = (((m_op_index + adjust)
18214 / m_line_header->maximum_ops_per_instruction)
18215 * m_line_header->minimum_instruction_length);
18216 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18217 m_op_index = ((m_op_index + adjust)
18218 % m_line_header->maximum_ops_per_instruction);
18222 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18224 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18225 CORE_ADDR addr_adj = (((m_op_index
18226 + (adj_opcode / m_line_header->line_range))
18227 / m_line_header->maximum_ops_per_instruction)
18228 * m_line_header->minimum_instruction_length);
18229 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18230 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18231 % m_line_header->maximum_ops_per_instruction);
18233 int line_delta = (m_line_header->line_base
18234 + (adj_opcode % m_line_header->line_range));
18235 advance_line (line_delta);
18236 record_line (false);
18237 m_discriminator = 0;
18241 lnp_state_machine::handle_set_file (file_name_index file)
18245 const file_entry *fe = current_file ();
18247 dwarf2_debug_line_missing_file_complaint ();
18248 else if (m_record_lines_p)
18250 const char *dir = fe->include_dir (m_line_header);
18252 m_last_subfile = current_subfile;
18253 m_line_has_non_zero_discriminator = m_discriminator != 0;
18254 dwarf2_start_subfile (fe->name, dir);
18259 lnp_state_machine::handle_const_add_pc ()
18262 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
18265 = (((m_op_index + adjust)
18266 / m_line_header->maximum_ops_per_instruction)
18267 * m_line_header->minimum_instruction_length);
18269 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18270 m_op_index = ((m_op_index + adjust)
18271 % m_line_header->maximum_ops_per_instruction);
18274 /* Ignore this record_line request. */
18277 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
18282 /* Return non-zero if we should add LINE to the line number table.
18283 LINE is the line to add, LAST_LINE is the last line that was added,
18284 LAST_SUBFILE is the subfile for LAST_LINE.
18285 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
18286 had a non-zero discriminator.
18288 We have to be careful in the presence of discriminators.
18289 E.g., for this line:
18291 for (i = 0; i < 100000; i++);
18293 clang can emit four line number entries for that one line,
18294 each with a different discriminator.
18295 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
18297 However, we want gdb to coalesce all four entries into one.
18298 Otherwise the user could stepi into the middle of the line and
18299 gdb would get confused about whether the pc really was in the
18300 middle of the line.
18302 Things are further complicated by the fact that two consecutive
18303 line number entries for the same line is a heuristic used by gcc
18304 to denote the end of the prologue. So we can't just discard duplicate
18305 entries, we have to be selective about it. The heuristic we use is
18306 that we only collapse consecutive entries for the same line if at least
18307 one of those entries has a non-zero discriminator. PR 17276.
18309 Note: Addresses in the line number state machine can never go backwards
18310 within one sequence, thus this coalescing is ok. */
18313 dwarf_record_line_p (unsigned int line, unsigned int last_line,
18314 int line_has_non_zero_discriminator,
18315 struct subfile *last_subfile)
18317 if (current_subfile != last_subfile)
18319 if (line != last_line)
18321 /* Same line for the same file that we've seen already.
18322 As a last check, for pr 17276, only record the line if the line
18323 has never had a non-zero discriminator. */
18324 if (!line_has_non_zero_discriminator)
18329 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
18330 in the line table of subfile SUBFILE. */
18333 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
18334 unsigned int line, CORE_ADDR address,
18335 record_line_ftype p_record_line)
18337 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
18339 if (dwarf_line_debug)
18341 fprintf_unfiltered (gdb_stdlog,
18342 "Recording line %u, file %s, address %s\n",
18343 line, lbasename (subfile->name),
18344 paddress (gdbarch, address));
18347 (*p_record_line) (subfile, line, addr);
18350 /* Subroutine of dwarf_decode_lines_1 to simplify it.
18351 Mark the end of a set of line number records.
18352 The arguments are the same as for dwarf_record_line_1.
18353 If SUBFILE is NULL the request is ignored. */
18356 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
18357 CORE_ADDR address, record_line_ftype p_record_line)
18359 if (subfile == NULL)
18362 if (dwarf_line_debug)
18364 fprintf_unfiltered (gdb_stdlog,
18365 "Finishing current line, file %s, address %s\n",
18366 lbasename (subfile->name),
18367 paddress (gdbarch, address));
18370 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
18374 lnp_state_machine::record_line (bool end_sequence)
18376 if (dwarf_line_debug)
18378 fprintf_unfiltered (gdb_stdlog,
18379 "Processing actual line %u: file %u,"
18380 " address %s, is_stmt %u, discrim %u\n",
18381 m_line, to_underlying (m_file),
18382 paddress (m_gdbarch, m_address),
18383 m_is_stmt, m_discriminator);
18386 file_entry *fe = current_file ();
18389 dwarf2_debug_line_missing_file_complaint ();
18390 /* For now we ignore lines not starting on an instruction boundary.
18391 But not when processing end_sequence for compatibility with the
18392 previous version of the code. */
18393 else if (m_op_index == 0 || end_sequence)
18395 fe->included_p = 1;
18396 if (m_record_lines_p && m_is_stmt)
18398 if (m_last_subfile != current_subfile || end_sequence)
18400 dwarf_finish_line (m_gdbarch, m_last_subfile,
18401 m_address, m_record_line_callback);
18406 if (dwarf_record_line_p (m_line, m_last_line,
18407 m_line_has_non_zero_discriminator,
18410 dwarf_record_line_1 (m_gdbarch, current_subfile,
18412 m_record_line_callback);
18414 m_last_subfile = current_subfile;
18415 m_last_line = m_line;
18421 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
18422 bool record_lines_p)
18425 m_record_lines_p = record_lines_p;
18426 m_line_header = lh;
18428 m_record_line_callback = ::record_line;
18430 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
18431 was a line entry for it so that the backend has a chance to adjust it
18432 and also record it in case it needs it. This is currently used by MIPS
18433 code, cf. `mips_adjust_dwarf2_line'. */
18434 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
18435 m_is_stmt = lh->default_is_stmt;
18436 m_discriminator = 0;
18440 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
18441 const gdb_byte *line_ptr,
18442 CORE_ADDR lowpc, CORE_ADDR address)
18444 /* If address < lowpc then it's not a usable value, it's outside the
18445 pc range of the CU. However, we restrict the test to only address
18446 values of zero to preserve GDB's previous behaviour which is to
18447 handle the specific case of a function being GC'd by the linker. */
18449 if (address == 0 && address < lowpc)
18451 /* This line table is for a function which has been
18452 GCd by the linker. Ignore it. PR gdb/12528 */
18454 struct objfile *objfile = cu->objfile;
18455 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
18457 complaint (&symfile_complaints,
18458 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
18459 line_offset, objfile_name (objfile));
18460 m_record_line_callback = noop_record_line;
18461 /* Note: record_line_callback is left as noop_record_line until
18462 we see DW_LNE_end_sequence. */
18466 /* Subroutine of dwarf_decode_lines to simplify it.
18467 Process the line number information in LH.
18468 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
18469 program in order to set included_p for every referenced header. */
18472 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
18473 const int decode_for_pst_p, CORE_ADDR lowpc)
18475 const gdb_byte *line_ptr, *extended_end;
18476 const gdb_byte *line_end;
18477 unsigned int bytes_read, extended_len;
18478 unsigned char op_code, extended_op;
18479 CORE_ADDR baseaddr;
18480 struct objfile *objfile = cu->objfile;
18481 bfd *abfd = objfile->obfd;
18482 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18483 /* True if we're recording line info (as opposed to building partial
18484 symtabs and just interested in finding include files mentioned by
18485 the line number program). */
18486 bool record_lines_p = !decode_for_pst_p;
18488 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18490 line_ptr = lh->statement_program_start;
18491 line_end = lh->statement_program_end;
18493 /* Read the statement sequences until there's nothing left. */
18494 while (line_ptr < line_end)
18496 /* The DWARF line number program state machine. Reset the state
18497 machine at the start of each sequence. */
18498 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
18499 bool end_sequence = false;
18501 if (record_lines_p)
18503 /* Start a subfile for the current file of the state
18505 const file_entry *fe = state_machine.current_file ();
18508 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
18511 /* Decode the table. */
18512 while (line_ptr < line_end && !end_sequence)
18514 op_code = read_1_byte (abfd, line_ptr);
18517 if (op_code >= lh->opcode_base)
18519 /* Special opcode. */
18520 state_machine.handle_special_opcode (op_code);
18522 else switch (op_code)
18524 case DW_LNS_extended_op:
18525 extended_len = read_unsigned_leb128 (abfd, line_ptr,
18527 line_ptr += bytes_read;
18528 extended_end = line_ptr + extended_len;
18529 extended_op = read_1_byte (abfd, line_ptr);
18531 switch (extended_op)
18533 case DW_LNE_end_sequence:
18534 state_machine.handle_end_sequence ();
18535 end_sequence = true;
18537 case DW_LNE_set_address:
18540 = read_address (abfd, line_ptr, cu, &bytes_read);
18541 line_ptr += bytes_read;
18543 state_machine.check_line_address (cu, line_ptr,
18545 state_machine.handle_set_address (baseaddr, address);
18548 case DW_LNE_define_file:
18550 const char *cur_file;
18551 unsigned int mod_time, length;
18554 cur_file = read_direct_string (abfd, line_ptr,
18556 line_ptr += bytes_read;
18557 dindex = (dir_index)
18558 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18559 line_ptr += bytes_read;
18561 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18562 line_ptr += bytes_read;
18564 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18565 line_ptr += bytes_read;
18566 lh->add_file_name (cur_file, dindex, mod_time, length);
18569 case DW_LNE_set_discriminator:
18571 /* The discriminator is not interesting to the
18572 debugger; just ignore it. We still need to
18573 check its value though:
18574 if there are consecutive entries for the same
18575 (non-prologue) line we want to coalesce them.
18578 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18579 line_ptr += bytes_read;
18581 state_machine.handle_set_discriminator (discr);
18585 complaint (&symfile_complaints,
18586 _("mangled .debug_line section"));
18589 /* Make sure that we parsed the extended op correctly. If e.g.
18590 we expected a different address size than the producer used,
18591 we may have read the wrong number of bytes. */
18592 if (line_ptr != extended_end)
18594 complaint (&symfile_complaints,
18595 _("mangled .debug_line section"));
18600 state_machine.handle_copy ();
18602 case DW_LNS_advance_pc:
18605 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18606 line_ptr += bytes_read;
18608 state_machine.handle_advance_pc (adjust);
18611 case DW_LNS_advance_line:
18614 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18615 line_ptr += bytes_read;
18617 state_machine.handle_advance_line (line_delta);
18620 case DW_LNS_set_file:
18622 file_name_index file
18623 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
18625 line_ptr += bytes_read;
18627 state_machine.handle_set_file (file);
18630 case DW_LNS_set_column:
18631 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18632 line_ptr += bytes_read;
18634 case DW_LNS_negate_stmt:
18635 state_machine.handle_negate_stmt ();
18637 case DW_LNS_set_basic_block:
18639 /* Add to the address register of the state machine the
18640 address increment value corresponding to special opcode
18641 255. I.e., this value is scaled by the minimum
18642 instruction length since special opcode 255 would have
18643 scaled the increment. */
18644 case DW_LNS_const_add_pc:
18645 state_machine.handle_const_add_pc ();
18647 case DW_LNS_fixed_advance_pc:
18649 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
18652 state_machine.handle_fixed_advance_pc (addr_adj);
18657 /* Unknown standard opcode, ignore it. */
18660 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18662 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18663 line_ptr += bytes_read;
18670 dwarf2_debug_line_missing_end_sequence_complaint ();
18672 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18673 in which case we still finish recording the last line). */
18674 state_machine.record_line (true);
18678 /* Decode the Line Number Program (LNP) for the given line_header
18679 structure and CU. The actual information extracted and the type
18680 of structures created from the LNP depends on the value of PST.
18682 1. If PST is NULL, then this procedure uses the data from the program
18683 to create all necessary symbol tables, and their linetables.
18685 2. If PST is not NULL, this procedure reads the program to determine
18686 the list of files included by the unit represented by PST, and
18687 builds all the associated partial symbol tables.
18689 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18690 It is used for relative paths in the line table.
18691 NOTE: When processing partial symtabs (pst != NULL),
18692 comp_dir == pst->dirname.
18694 NOTE: It is important that psymtabs have the same file name (via strcmp)
18695 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18696 symtab we don't use it in the name of the psymtabs we create.
18697 E.g. expand_line_sal requires this when finding psymtabs to expand.
18698 A good testcase for this is mb-inline.exp.
18700 LOWPC is the lowest address in CU (or 0 if not known).
18702 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18703 for its PC<->lines mapping information. Otherwise only the filename
18704 table is read in. */
18707 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18708 struct dwarf2_cu *cu, struct partial_symtab *pst,
18709 CORE_ADDR lowpc, int decode_mapping)
18711 struct objfile *objfile = cu->objfile;
18712 const int decode_for_pst_p = (pst != NULL);
18714 if (decode_mapping)
18715 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18717 if (decode_for_pst_p)
18721 /* Now that we're done scanning the Line Header Program, we can
18722 create the psymtab of each included file. */
18723 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
18724 if (lh->file_names[file_index].included_p == 1)
18726 const char *include_name =
18727 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18728 if (include_name != NULL)
18729 dwarf2_create_include_psymtab (include_name, pst, objfile);
18734 /* Make sure a symtab is created for every file, even files
18735 which contain only variables (i.e. no code with associated
18737 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18740 for (i = 0; i < lh->file_names.size (); i++)
18742 file_entry &fe = lh->file_names[i];
18744 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
18746 if (current_subfile->symtab == NULL)
18748 current_subfile->symtab
18749 = allocate_symtab (cust, current_subfile->name);
18751 fe.symtab = current_subfile->symtab;
18756 /* Start a subfile for DWARF. FILENAME is the name of the file and
18757 DIRNAME the name of the source directory which contains FILENAME
18758 or NULL if not known.
18759 This routine tries to keep line numbers from identical absolute and
18760 relative file names in a common subfile.
18762 Using the `list' example from the GDB testsuite, which resides in
18763 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18764 of /srcdir/list0.c yields the following debugging information for list0.c:
18766 DW_AT_name: /srcdir/list0.c
18767 DW_AT_comp_dir: /compdir
18768 files.files[0].name: list0.h
18769 files.files[0].dir: /srcdir
18770 files.files[1].name: list0.c
18771 files.files[1].dir: /srcdir
18773 The line number information for list0.c has to end up in a single
18774 subfile, so that `break /srcdir/list0.c:1' works as expected.
18775 start_subfile will ensure that this happens provided that we pass the
18776 concatenation of files.files[1].dir and files.files[1].name as the
18780 dwarf2_start_subfile (const char *filename, const char *dirname)
18784 /* In order not to lose the line information directory,
18785 we concatenate it to the filename when it makes sense.
18786 Note that the Dwarf3 standard says (speaking of filenames in line
18787 information): ``The directory index is ignored for file names
18788 that represent full path names''. Thus ignoring dirname in the
18789 `else' branch below isn't an issue. */
18791 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18793 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18797 start_subfile (filename);
18803 /* Start a symtab for DWARF.
18804 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18806 static struct compunit_symtab *
18807 dwarf2_start_symtab (struct dwarf2_cu *cu,
18808 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18810 struct compunit_symtab *cust
18811 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18813 record_debugformat ("DWARF 2");
18814 record_producer (cu->producer);
18816 /* We assume that we're processing GCC output. */
18817 processing_gcc_compilation = 2;
18819 cu->processing_has_namespace_info = 0;
18825 var_decode_location (struct attribute *attr, struct symbol *sym,
18826 struct dwarf2_cu *cu)
18828 struct objfile *objfile = cu->objfile;
18829 struct comp_unit_head *cu_header = &cu->header;
18831 /* NOTE drow/2003-01-30: There used to be a comment and some special
18832 code here to turn a symbol with DW_AT_external and a
18833 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
18834 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
18835 with some versions of binutils) where shared libraries could have
18836 relocations against symbols in their debug information - the
18837 minimal symbol would have the right address, but the debug info
18838 would not. It's no longer necessary, because we will explicitly
18839 apply relocations when we read in the debug information now. */
18841 /* A DW_AT_location attribute with no contents indicates that a
18842 variable has been optimized away. */
18843 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
18845 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
18849 /* Handle one degenerate form of location expression specially, to
18850 preserve GDB's previous behavior when section offsets are
18851 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
18852 then mark this symbol as LOC_STATIC. */
18854 if (attr_form_is_block (attr)
18855 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
18856 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
18857 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
18858 && (DW_BLOCK (attr)->size
18859 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
18861 unsigned int dummy;
18863 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
18864 SYMBOL_VALUE_ADDRESS (sym) =
18865 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
18867 SYMBOL_VALUE_ADDRESS (sym) =
18868 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
18869 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
18870 fixup_symbol_section (sym, objfile);
18871 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
18872 SYMBOL_SECTION (sym));
18876 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
18877 expression evaluator, and use LOC_COMPUTED only when necessary
18878 (i.e. when the value of a register or memory location is
18879 referenced, or a thread-local block, etc.). Then again, it might
18880 not be worthwhile. I'm assuming that it isn't unless performance
18881 or memory numbers show me otherwise. */
18883 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
18885 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
18886 cu->has_loclist = 1;
18889 /* Given a pointer to a DWARF information entry, figure out if we need
18890 to make a symbol table entry for it, and if so, create a new entry
18891 and return a pointer to it.
18892 If TYPE is NULL, determine symbol type from the die, otherwise
18893 used the passed type.
18894 If SPACE is not NULL, use it to hold the new symbol. If it is
18895 NULL, allocate a new symbol on the objfile's obstack. */
18897 static struct symbol *
18898 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
18899 struct symbol *space)
18901 struct objfile *objfile = cu->objfile;
18902 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18903 struct symbol *sym = NULL;
18905 struct attribute *attr = NULL;
18906 struct attribute *attr2 = NULL;
18907 CORE_ADDR baseaddr;
18908 struct pending **list_to_add = NULL;
18910 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
18912 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18914 name = dwarf2_name (die, cu);
18917 const char *linkagename;
18918 int suppress_add = 0;
18923 sym = allocate_symbol (objfile);
18924 OBJSTAT (objfile, n_syms++);
18926 /* Cache this symbol's name and the name's demangled form (if any). */
18927 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
18928 linkagename = dwarf2_physname (name, die, cu);
18929 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
18931 /* Fortran does not have mangling standard and the mangling does differ
18932 between gfortran, iFort etc. */
18933 if (cu->language == language_fortran
18934 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
18935 symbol_set_demangled_name (&(sym->ginfo),
18936 dwarf2_full_name (name, die, cu),
18939 /* Default assumptions.
18940 Use the passed type or decode it from the die. */
18941 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
18942 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
18944 SYMBOL_TYPE (sym) = type;
18946 SYMBOL_TYPE (sym) = die_type (die, cu);
18947 attr = dwarf2_attr (die,
18948 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
18952 SYMBOL_LINE (sym) = DW_UNSND (attr);
18955 attr = dwarf2_attr (die,
18956 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
18960 file_name_index file_index = (file_name_index) DW_UNSND (attr);
18961 struct file_entry *fe;
18963 if (cu->line_header != NULL)
18964 fe = cu->line_header->file_name_at (file_index);
18969 complaint (&symfile_complaints,
18970 _("file index out of range"));
18972 symbol_set_symtab (sym, fe->symtab);
18978 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
18983 addr = attr_value_as_address (attr);
18984 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
18985 SYMBOL_VALUE_ADDRESS (sym) = addr;
18987 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
18988 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
18989 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
18990 add_symbol_to_list (sym, cu->list_in_scope);
18992 case DW_TAG_subprogram:
18993 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
18995 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
18996 attr2 = dwarf2_attr (die, DW_AT_external, cu);
18997 if ((attr2 && (DW_UNSND (attr2) != 0))
18998 || cu->language == language_ada)
19000 /* Subprograms marked external are stored as a global symbol.
19001 Ada subprograms, whether marked external or not, are always
19002 stored as a global symbol, because we want to be able to
19003 access them globally. For instance, we want to be able
19004 to break on a nested subprogram without having to
19005 specify the context. */
19006 list_to_add = &global_symbols;
19010 list_to_add = cu->list_in_scope;
19013 case DW_TAG_inlined_subroutine:
19014 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19016 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19017 SYMBOL_INLINED (sym) = 1;
19018 list_to_add = cu->list_in_scope;
19020 case DW_TAG_template_value_param:
19022 /* Fall through. */
19023 case DW_TAG_constant:
19024 case DW_TAG_variable:
19025 case DW_TAG_member:
19026 /* Compilation with minimal debug info may result in
19027 variables with missing type entries. Change the
19028 misleading `void' type to something sensible. */
19029 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19031 = objfile_type (objfile)->nodebug_data_symbol;
19033 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19034 /* In the case of DW_TAG_member, we should only be called for
19035 static const members. */
19036 if (die->tag == DW_TAG_member)
19038 /* dwarf2_add_field uses die_is_declaration,
19039 so we do the same. */
19040 gdb_assert (die_is_declaration (die, cu));
19045 dwarf2_const_value (attr, sym, cu);
19046 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19049 if (attr2 && (DW_UNSND (attr2) != 0))
19050 list_to_add = &global_symbols;
19052 list_to_add = cu->list_in_scope;
19056 attr = dwarf2_attr (die, DW_AT_location, cu);
19059 var_decode_location (attr, sym, cu);
19060 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19062 /* Fortran explicitly imports any global symbols to the local
19063 scope by DW_TAG_common_block. */
19064 if (cu->language == language_fortran && die->parent
19065 && die->parent->tag == DW_TAG_common_block)
19068 if (SYMBOL_CLASS (sym) == LOC_STATIC
19069 && SYMBOL_VALUE_ADDRESS (sym) == 0
19070 && !dwarf2_per_objfile->has_section_at_zero)
19072 /* When a static variable is eliminated by the linker,
19073 the corresponding debug information is not stripped
19074 out, but the variable address is set to null;
19075 do not add such variables into symbol table. */
19077 else if (attr2 && (DW_UNSND (attr2) != 0))
19079 /* Workaround gfortran PR debug/40040 - it uses
19080 DW_AT_location for variables in -fPIC libraries which may
19081 get overriden by other libraries/executable and get
19082 a different address. Resolve it by the minimal symbol
19083 which may come from inferior's executable using copy
19084 relocation. Make this workaround only for gfortran as for
19085 other compilers GDB cannot guess the minimal symbol
19086 Fortran mangling kind. */
19087 if (cu->language == language_fortran && die->parent
19088 && die->parent->tag == DW_TAG_module
19090 && startswith (cu->producer, "GNU Fortran"))
19091 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19093 /* A variable with DW_AT_external is never static,
19094 but it may be block-scoped. */
19095 list_to_add = (cu->list_in_scope == &file_symbols
19096 ? &global_symbols : cu->list_in_scope);
19099 list_to_add = cu->list_in_scope;
19103 /* We do not know the address of this symbol.
19104 If it is an external symbol and we have type information
19105 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19106 The address of the variable will then be determined from
19107 the minimal symbol table whenever the variable is
19109 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19111 /* Fortran explicitly imports any global symbols to the local
19112 scope by DW_TAG_common_block. */
19113 if (cu->language == language_fortran && die->parent
19114 && die->parent->tag == DW_TAG_common_block)
19116 /* SYMBOL_CLASS doesn't matter here because
19117 read_common_block is going to reset it. */
19119 list_to_add = cu->list_in_scope;
19121 else if (attr2 && (DW_UNSND (attr2) != 0)
19122 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19124 /* A variable with DW_AT_external is never static, but it
19125 may be block-scoped. */
19126 list_to_add = (cu->list_in_scope == &file_symbols
19127 ? &global_symbols : cu->list_in_scope);
19129 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19131 else if (!die_is_declaration (die, cu))
19133 /* Use the default LOC_OPTIMIZED_OUT class. */
19134 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19136 list_to_add = cu->list_in_scope;
19140 case DW_TAG_formal_parameter:
19141 /* If we are inside a function, mark this as an argument. If
19142 not, we might be looking at an argument to an inlined function
19143 when we do not have enough information to show inlined frames;
19144 pretend it's a local variable in that case so that the user can
19146 if (context_stack_depth > 0
19147 && context_stack[context_stack_depth - 1].name != NULL)
19148 SYMBOL_IS_ARGUMENT (sym) = 1;
19149 attr = dwarf2_attr (die, DW_AT_location, cu);
19152 var_decode_location (attr, sym, cu);
19154 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19157 dwarf2_const_value (attr, sym, cu);
19160 list_to_add = cu->list_in_scope;
19162 case DW_TAG_unspecified_parameters:
19163 /* From varargs functions; gdb doesn't seem to have any
19164 interest in this information, so just ignore it for now.
19167 case DW_TAG_template_type_param:
19169 /* Fall through. */
19170 case DW_TAG_class_type:
19171 case DW_TAG_interface_type:
19172 case DW_TAG_structure_type:
19173 case DW_TAG_union_type:
19174 case DW_TAG_set_type:
19175 case DW_TAG_enumeration_type:
19176 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19177 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19180 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19181 really ever be static objects: otherwise, if you try
19182 to, say, break of a class's method and you're in a file
19183 which doesn't mention that class, it won't work unless
19184 the check for all static symbols in lookup_symbol_aux
19185 saves you. See the OtherFileClass tests in
19186 gdb.c++/namespace.exp. */
19190 list_to_add = (cu->list_in_scope == &file_symbols
19191 && cu->language == language_cplus
19192 ? &global_symbols : cu->list_in_scope);
19194 /* The semantics of C++ state that "struct foo {
19195 ... }" also defines a typedef for "foo". */
19196 if (cu->language == language_cplus
19197 || cu->language == language_ada
19198 || cu->language == language_d
19199 || cu->language == language_rust)
19201 /* The symbol's name is already allocated along
19202 with this objfile, so we don't need to
19203 duplicate it for the type. */
19204 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19205 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19210 case DW_TAG_typedef:
19211 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19212 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19213 list_to_add = cu->list_in_scope;
19215 case DW_TAG_base_type:
19216 case DW_TAG_subrange_type:
19217 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19218 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19219 list_to_add = cu->list_in_scope;
19221 case DW_TAG_enumerator:
19222 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19225 dwarf2_const_value (attr, sym, cu);
19228 /* NOTE: carlton/2003-11-10: See comment above in the
19229 DW_TAG_class_type, etc. block. */
19231 list_to_add = (cu->list_in_scope == &file_symbols
19232 && cu->language == language_cplus
19233 ? &global_symbols : cu->list_in_scope);
19236 case DW_TAG_imported_declaration:
19237 case DW_TAG_namespace:
19238 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19239 list_to_add = &global_symbols;
19241 case DW_TAG_module:
19242 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19243 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
19244 list_to_add = &global_symbols;
19246 case DW_TAG_common_block:
19247 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
19248 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
19249 add_symbol_to_list (sym, cu->list_in_scope);
19252 /* Not a tag we recognize. Hopefully we aren't processing
19253 trash data, but since we must specifically ignore things
19254 we don't recognize, there is nothing else we should do at
19256 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
19257 dwarf_tag_name (die->tag));
19263 sym->hash_next = objfile->template_symbols;
19264 objfile->template_symbols = sym;
19265 list_to_add = NULL;
19268 if (list_to_add != NULL)
19269 add_symbol_to_list (sym, list_to_add);
19271 /* For the benefit of old versions of GCC, check for anonymous
19272 namespaces based on the demangled name. */
19273 if (!cu->processing_has_namespace_info
19274 && cu->language == language_cplus)
19275 cp_scan_for_anonymous_namespaces (sym, objfile);
19280 /* A wrapper for new_symbol_full that always allocates a new symbol. */
19282 static struct symbol *
19283 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19285 return new_symbol_full (die, type, cu, NULL);
19288 /* Given an attr with a DW_FORM_dataN value in host byte order,
19289 zero-extend it as appropriate for the symbol's type. The DWARF
19290 standard (v4) is not entirely clear about the meaning of using
19291 DW_FORM_dataN for a constant with a signed type, where the type is
19292 wider than the data. The conclusion of a discussion on the DWARF
19293 list was that this is unspecified. We choose to always zero-extend
19294 because that is the interpretation long in use by GCC. */
19297 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
19298 struct dwarf2_cu *cu, LONGEST *value, int bits)
19300 struct objfile *objfile = cu->objfile;
19301 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
19302 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
19303 LONGEST l = DW_UNSND (attr);
19305 if (bits < sizeof (*value) * 8)
19307 l &= ((LONGEST) 1 << bits) - 1;
19310 else if (bits == sizeof (*value) * 8)
19314 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
19315 store_unsigned_integer (bytes, bits / 8, byte_order, l);
19322 /* Read a constant value from an attribute. Either set *VALUE, or if
19323 the value does not fit in *VALUE, set *BYTES - either already
19324 allocated on the objfile obstack, or newly allocated on OBSTACK,
19325 or, set *BATON, if we translated the constant to a location
19329 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
19330 const char *name, struct obstack *obstack,
19331 struct dwarf2_cu *cu,
19332 LONGEST *value, const gdb_byte **bytes,
19333 struct dwarf2_locexpr_baton **baton)
19335 struct objfile *objfile = cu->objfile;
19336 struct comp_unit_head *cu_header = &cu->header;
19337 struct dwarf_block *blk;
19338 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
19339 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19345 switch (attr->form)
19348 case DW_FORM_GNU_addr_index:
19352 if (TYPE_LENGTH (type) != cu_header->addr_size)
19353 dwarf2_const_value_length_mismatch_complaint (name,
19354 cu_header->addr_size,
19355 TYPE_LENGTH (type));
19356 /* Symbols of this form are reasonably rare, so we just
19357 piggyback on the existing location code rather than writing
19358 a new implementation of symbol_computed_ops. */
19359 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
19360 (*baton)->per_cu = cu->per_cu;
19361 gdb_assert ((*baton)->per_cu);
19363 (*baton)->size = 2 + cu_header->addr_size;
19364 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
19365 (*baton)->data = data;
19367 data[0] = DW_OP_addr;
19368 store_unsigned_integer (&data[1], cu_header->addr_size,
19369 byte_order, DW_ADDR (attr));
19370 data[cu_header->addr_size + 1] = DW_OP_stack_value;
19373 case DW_FORM_string:
19375 case DW_FORM_GNU_str_index:
19376 case DW_FORM_GNU_strp_alt:
19377 /* DW_STRING is already allocated on the objfile obstack, point
19379 *bytes = (const gdb_byte *) DW_STRING (attr);
19381 case DW_FORM_block1:
19382 case DW_FORM_block2:
19383 case DW_FORM_block4:
19384 case DW_FORM_block:
19385 case DW_FORM_exprloc:
19386 case DW_FORM_data16:
19387 blk = DW_BLOCK (attr);
19388 if (TYPE_LENGTH (type) != blk->size)
19389 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
19390 TYPE_LENGTH (type));
19391 *bytes = blk->data;
19394 /* The DW_AT_const_value attributes are supposed to carry the
19395 symbol's value "represented as it would be on the target
19396 architecture." By the time we get here, it's already been
19397 converted to host endianness, so we just need to sign- or
19398 zero-extend it as appropriate. */
19399 case DW_FORM_data1:
19400 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
19402 case DW_FORM_data2:
19403 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
19405 case DW_FORM_data4:
19406 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
19408 case DW_FORM_data8:
19409 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
19412 case DW_FORM_sdata:
19413 *value = DW_SND (attr);
19416 case DW_FORM_udata:
19417 *value = DW_UNSND (attr);
19421 complaint (&symfile_complaints,
19422 _("unsupported const value attribute form: '%s'"),
19423 dwarf_form_name (attr->form));
19430 /* Copy constant value from an attribute to a symbol. */
19433 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
19434 struct dwarf2_cu *cu)
19436 struct objfile *objfile = cu->objfile;
19438 const gdb_byte *bytes;
19439 struct dwarf2_locexpr_baton *baton;
19441 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
19442 SYMBOL_PRINT_NAME (sym),
19443 &objfile->objfile_obstack, cu,
19444 &value, &bytes, &baton);
19448 SYMBOL_LOCATION_BATON (sym) = baton;
19449 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
19451 else if (bytes != NULL)
19453 SYMBOL_VALUE_BYTES (sym) = bytes;
19454 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
19458 SYMBOL_VALUE (sym) = value;
19459 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
19463 /* Return the type of the die in question using its DW_AT_type attribute. */
19465 static struct type *
19466 die_type (struct die_info *die, struct dwarf2_cu *cu)
19468 struct attribute *type_attr;
19470 type_attr = dwarf2_attr (die, DW_AT_type, cu);
19473 /* A missing DW_AT_type represents a void type. */
19474 return objfile_type (cu->objfile)->builtin_void;
19477 return lookup_die_type (die, type_attr, cu);
19480 /* True iff CU's producer generates GNAT Ada auxiliary information
19481 that allows to find parallel types through that information instead
19482 of having to do expensive parallel lookups by type name. */
19485 need_gnat_info (struct dwarf2_cu *cu)
19487 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
19488 of GNAT produces this auxiliary information, without any indication
19489 that it is produced. Part of enhancing the FSF version of GNAT
19490 to produce that information will be to put in place an indicator
19491 that we can use in order to determine whether the descriptive type
19492 info is available or not. One suggestion that has been made is
19493 to use a new attribute, attached to the CU die. For now, assume
19494 that the descriptive type info is not available. */
19498 /* Return the auxiliary type of the die in question using its
19499 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
19500 attribute is not present. */
19502 static struct type *
19503 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
19505 struct attribute *type_attr;
19507 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
19511 return lookup_die_type (die, type_attr, cu);
19514 /* If DIE has a descriptive_type attribute, then set the TYPE's
19515 descriptive type accordingly. */
19518 set_descriptive_type (struct type *type, struct die_info *die,
19519 struct dwarf2_cu *cu)
19521 struct type *descriptive_type = die_descriptive_type (die, cu);
19523 if (descriptive_type)
19525 ALLOCATE_GNAT_AUX_TYPE (type);
19526 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
19530 /* Return the containing type of the die in question using its
19531 DW_AT_containing_type attribute. */
19533 static struct type *
19534 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
19536 struct attribute *type_attr;
19538 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
19540 error (_("Dwarf Error: Problem turning containing type into gdb type "
19541 "[in module %s]"), objfile_name (cu->objfile));
19543 return lookup_die_type (die, type_attr, cu);
19546 /* Return an error marker type to use for the ill formed type in DIE/CU. */
19548 static struct type *
19549 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
19551 struct objfile *objfile = dwarf2_per_objfile->objfile;
19552 char *message, *saved;
19554 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
19555 objfile_name (objfile),
19556 to_underlying (cu->header.sect_off),
19557 to_underlying (die->sect_off));
19558 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
19559 message, strlen (message));
19562 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19565 /* Look up the type of DIE in CU using its type attribute ATTR.
19566 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19567 DW_AT_containing_type.
19568 If there is no type substitute an error marker. */
19570 static struct type *
19571 lookup_die_type (struct die_info *die, const struct attribute *attr,
19572 struct dwarf2_cu *cu)
19574 struct objfile *objfile = cu->objfile;
19575 struct type *this_type;
19577 gdb_assert (attr->name == DW_AT_type
19578 || attr->name == DW_AT_GNAT_descriptive_type
19579 || attr->name == DW_AT_containing_type);
19581 /* First see if we have it cached. */
19583 if (attr->form == DW_FORM_GNU_ref_alt)
19585 struct dwarf2_per_cu_data *per_cu;
19586 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19588 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
19589 this_type = get_die_type_at_offset (sect_off, per_cu);
19591 else if (attr_form_is_ref (attr))
19593 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19595 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
19597 else if (attr->form == DW_FORM_ref_sig8)
19599 ULONGEST signature = DW_SIGNATURE (attr);
19601 return get_signatured_type (die, signature, cu);
19605 complaint (&symfile_complaints,
19606 _("Dwarf Error: Bad type attribute %s in DIE"
19607 " at 0x%x [in module %s]"),
19608 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
19609 objfile_name (objfile));
19610 return build_error_marker_type (cu, die);
19613 /* If not cached we need to read it in. */
19615 if (this_type == NULL)
19617 struct die_info *type_die = NULL;
19618 struct dwarf2_cu *type_cu = cu;
19620 if (attr_form_is_ref (attr))
19621 type_die = follow_die_ref (die, attr, &type_cu);
19622 if (type_die == NULL)
19623 return build_error_marker_type (cu, die);
19624 /* If we find the type now, it's probably because the type came
19625 from an inter-CU reference and the type's CU got expanded before
19627 this_type = read_type_die (type_die, type_cu);
19630 /* If we still don't have a type use an error marker. */
19632 if (this_type == NULL)
19633 return build_error_marker_type (cu, die);
19638 /* Return the type in DIE, CU.
19639 Returns NULL for invalid types.
19641 This first does a lookup in die_type_hash,
19642 and only reads the die in if necessary.
19644 NOTE: This can be called when reading in partial or full symbols. */
19646 static struct type *
19647 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19649 struct type *this_type;
19651 this_type = get_die_type (die, cu);
19655 return read_type_die_1 (die, cu);
19658 /* Read the type in DIE, CU.
19659 Returns NULL for invalid types. */
19661 static struct type *
19662 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19664 struct type *this_type = NULL;
19668 case DW_TAG_class_type:
19669 case DW_TAG_interface_type:
19670 case DW_TAG_structure_type:
19671 case DW_TAG_union_type:
19672 this_type = read_structure_type (die, cu);
19674 case DW_TAG_enumeration_type:
19675 this_type = read_enumeration_type (die, cu);
19677 case DW_TAG_subprogram:
19678 case DW_TAG_subroutine_type:
19679 case DW_TAG_inlined_subroutine:
19680 this_type = read_subroutine_type (die, cu);
19682 case DW_TAG_array_type:
19683 this_type = read_array_type (die, cu);
19685 case DW_TAG_set_type:
19686 this_type = read_set_type (die, cu);
19688 case DW_TAG_pointer_type:
19689 this_type = read_tag_pointer_type (die, cu);
19691 case DW_TAG_ptr_to_member_type:
19692 this_type = read_tag_ptr_to_member_type (die, cu);
19694 case DW_TAG_reference_type:
19695 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
19697 case DW_TAG_rvalue_reference_type:
19698 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
19700 case DW_TAG_const_type:
19701 this_type = read_tag_const_type (die, cu);
19703 case DW_TAG_volatile_type:
19704 this_type = read_tag_volatile_type (die, cu);
19706 case DW_TAG_restrict_type:
19707 this_type = read_tag_restrict_type (die, cu);
19709 case DW_TAG_string_type:
19710 this_type = read_tag_string_type (die, cu);
19712 case DW_TAG_typedef:
19713 this_type = read_typedef (die, cu);
19715 case DW_TAG_subrange_type:
19716 this_type = read_subrange_type (die, cu);
19718 case DW_TAG_base_type:
19719 this_type = read_base_type (die, cu);
19721 case DW_TAG_unspecified_type:
19722 this_type = read_unspecified_type (die, cu);
19724 case DW_TAG_namespace:
19725 this_type = read_namespace_type (die, cu);
19727 case DW_TAG_module:
19728 this_type = read_module_type (die, cu);
19730 case DW_TAG_atomic_type:
19731 this_type = read_tag_atomic_type (die, cu);
19734 complaint (&symfile_complaints,
19735 _("unexpected tag in read_type_die: '%s'"),
19736 dwarf_tag_name (die->tag));
19743 /* See if we can figure out if the class lives in a namespace. We do
19744 this by looking for a member function; its demangled name will
19745 contain namespace info, if there is any.
19746 Return the computed name or NULL.
19747 Space for the result is allocated on the objfile's obstack.
19748 This is the full-die version of guess_partial_die_structure_name.
19749 In this case we know DIE has no useful parent. */
19752 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19754 struct die_info *spec_die;
19755 struct dwarf2_cu *spec_cu;
19756 struct die_info *child;
19759 spec_die = die_specification (die, &spec_cu);
19760 if (spec_die != NULL)
19766 for (child = die->child;
19768 child = child->sibling)
19770 if (child->tag == DW_TAG_subprogram)
19772 const char *linkage_name;
19774 linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu);
19775 if (linkage_name == NULL)
19776 linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name,
19778 if (linkage_name != NULL)
19781 = language_class_name_from_physname (cu->language_defn,
19785 if (actual_name != NULL)
19787 const char *die_name = dwarf2_name (die, cu);
19789 if (die_name != NULL
19790 && strcmp (die_name, actual_name) != 0)
19792 /* Strip off the class name from the full name.
19793 We want the prefix. */
19794 int die_name_len = strlen (die_name);
19795 int actual_name_len = strlen (actual_name);
19797 /* Test for '::' as a sanity check. */
19798 if (actual_name_len > die_name_len + 2
19799 && actual_name[actual_name_len
19800 - die_name_len - 1] == ':')
19801 name = (char *) obstack_copy0 (
19802 &cu->objfile->per_bfd->storage_obstack,
19803 actual_name, actual_name_len - die_name_len - 2);
19806 xfree (actual_name);
19815 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19816 prefix part in such case. See
19817 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19819 static const char *
19820 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19822 struct attribute *attr;
19825 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19826 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
19829 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
19832 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
19834 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
19835 if (attr == NULL || DW_STRING (attr) == NULL)
19838 /* dwarf2_name had to be already called. */
19839 gdb_assert (DW_STRING_IS_CANONICAL (attr));
19841 /* Strip the base name, keep any leading namespaces/classes. */
19842 base = strrchr (DW_STRING (attr), ':');
19843 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
19846 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
19848 &base[-1] - DW_STRING (attr));
19851 /* Return the name of the namespace/class that DIE is defined within,
19852 or "" if we can't tell. The caller should not xfree the result.
19854 For example, if we're within the method foo() in the following
19864 then determine_prefix on foo's die will return "N::C". */
19866 static const char *
19867 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
19869 struct die_info *parent, *spec_die;
19870 struct dwarf2_cu *spec_cu;
19871 struct type *parent_type;
19872 const char *retval;
19874 if (cu->language != language_cplus
19875 && cu->language != language_fortran && cu->language != language_d
19876 && cu->language != language_rust)
19879 retval = anonymous_struct_prefix (die, cu);
19883 /* We have to be careful in the presence of DW_AT_specification.
19884 For example, with GCC 3.4, given the code
19888 // Definition of N::foo.
19892 then we'll have a tree of DIEs like this:
19894 1: DW_TAG_compile_unit
19895 2: DW_TAG_namespace // N
19896 3: DW_TAG_subprogram // declaration of N::foo
19897 4: DW_TAG_subprogram // definition of N::foo
19898 DW_AT_specification // refers to die #3
19900 Thus, when processing die #4, we have to pretend that we're in
19901 the context of its DW_AT_specification, namely the contex of die
19904 spec_die = die_specification (die, &spec_cu);
19905 if (spec_die == NULL)
19906 parent = die->parent;
19909 parent = spec_die->parent;
19913 if (parent == NULL)
19915 else if (parent->building_fullname)
19918 const char *parent_name;
19920 /* It has been seen on RealView 2.2 built binaries,
19921 DW_TAG_template_type_param types actually _defined_ as
19922 children of the parent class:
19925 template class <class Enum> Class{};
19926 Class<enum E> class_e;
19928 1: DW_TAG_class_type (Class)
19929 2: DW_TAG_enumeration_type (E)
19930 3: DW_TAG_enumerator (enum1:0)
19931 3: DW_TAG_enumerator (enum2:1)
19933 2: DW_TAG_template_type_param
19934 DW_AT_type DW_FORM_ref_udata (E)
19936 Besides being broken debug info, it can put GDB into an
19937 infinite loop. Consider:
19939 When we're building the full name for Class<E>, we'll start
19940 at Class, and go look over its template type parameters,
19941 finding E. We'll then try to build the full name of E, and
19942 reach here. We're now trying to build the full name of E,
19943 and look over the parent DIE for containing scope. In the
19944 broken case, if we followed the parent DIE of E, we'd again
19945 find Class, and once again go look at its template type
19946 arguments, etc., etc. Simply don't consider such parent die
19947 as source-level parent of this die (it can't be, the language
19948 doesn't allow it), and break the loop here. */
19949 name = dwarf2_name (die, cu);
19950 parent_name = dwarf2_name (parent, cu);
19951 complaint (&symfile_complaints,
19952 _("template param type '%s' defined within parent '%s'"),
19953 name ? name : "<unknown>",
19954 parent_name ? parent_name : "<unknown>");
19958 switch (parent->tag)
19960 case DW_TAG_namespace:
19961 parent_type = read_type_die (parent, cu);
19962 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
19963 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
19964 Work around this problem here. */
19965 if (cu->language == language_cplus
19966 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
19968 /* We give a name to even anonymous namespaces. */
19969 return TYPE_TAG_NAME (parent_type);
19970 case DW_TAG_class_type:
19971 case DW_TAG_interface_type:
19972 case DW_TAG_structure_type:
19973 case DW_TAG_union_type:
19974 case DW_TAG_module:
19975 parent_type = read_type_die (parent, cu);
19976 if (TYPE_TAG_NAME (parent_type) != NULL)
19977 return TYPE_TAG_NAME (parent_type);
19979 /* An anonymous structure is only allowed non-static data
19980 members; no typedefs, no member functions, et cetera.
19981 So it does not need a prefix. */
19983 case DW_TAG_compile_unit:
19984 case DW_TAG_partial_unit:
19985 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
19986 if (cu->language == language_cplus
19987 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
19988 && die->child != NULL
19989 && (die->tag == DW_TAG_class_type
19990 || die->tag == DW_TAG_structure_type
19991 || die->tag == DW_TAG_union_type))
19993 char *name = guess_full_die_structure_name (die, cu);
19998 case DW_TAG_enumeration_type:
19999 parent_type = read_type_die (parent, cu);
20000 if (TYPE_DECLARED_CLASS (parent_type))
20002 if (TYPE_TAG_NAME (parent_type) != NULL)
20003 return TYPE_TAG_NAME (parent_type);
20006 /* Fall through. */
20008 return determine_prefix (parent, cu);
20012 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20013 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20014 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20015 an obconcat, otherwise allocate storage for the result. The CU argument is
20016 used to determine the language and hence, the appropriate separator. */
20018 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20021 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20022 int physname, struct dwarf2_cu *cu)
20024 const char *lead = "";
20027 if (suffix == NULL || suffix[0] == '\0'
20028 || prefix == NULL || prefix[0] == '\0')
20030 else if (cu->language == language_d)
20032 /* For D, the 'main' function could be defined in any module, but it
20033 should never be prefixed. */
20034 if (strcmp (suffix, "D main") == 0)
20042 else if (cu->language == language_fortran && physname)
20044 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20045 DW_AT_MIPS_linkage_name is preferred and used instead. */
20053 if (prefix == NULL)
20055 if (suffix == NULL)
20062 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20064 strcpy (retval, lead);
20065 strcat (retval, prefix);
20066 strcat (retval, sep);
20067 strcat (retval, suffix);
20072 /* We have an obstack. */
20073 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20077 /* Return sibling of die, NULL if no sibling. */
20079 static struct die_info *
20080 sibling_die (struct die_info *die)
20082 return die->sibling;
20085 /* Get name of a die, return NULL if not found. */
20087 static const char *
20088 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20089 struct obstack *obstack)
20091 if (name && cu->language == language_cplus)
20093 std::string canon_name = cp_canonicalize_string (name);
20095 if (!canon_name.empty ())
20097 if (canon_name != name)
20098 name = (const char *) obstack_copy0 (obstack,
20099 canon_name.c_str (),
20100 canon_name.length ());
20107 /* Get name of a die, return NULL if not found.
20108 Anonymous namespaces are converted to their magic string. */
20110 static const char *
20111 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20113 struct attribute *attr;
20115 attr = dwarf2_attr (die, DW_AT_name, cu);
20116 if ((!attr || !DW_STRING (attr))
20117 && die->tag != DW_TAG_namespace
20118 && die->tag != DW_TAG_class_type
20119 && die->tag != DW_TAG_interface_type
20120 && die->tag != DW_TAG_structure_type
20121 && die->tag != DW_TAG_union_type)
20126 case DW_TAG_compile_unit:
20127 case DW_TAG_partial_unit:
20128 /* Compilation units have a DW_AT_name that is a filename, not
20129 a source language identifier. */
20130 case DW_TAG_enumeration_type:
20131 case DW_TAG_enumerator:
20132 /* These tags always have simple identifiers already; no need
20133 to canonicalize them. */
20134 return DW_STRING (attr);
20136 case DW_TAG_namespace:
20137 if (attr != NULL && DW_STRING (attr) != NULL)
20138 return DW_STRING (attr);
20139 return CP_ANONYMOUS_NAMESPACE_STR;
20141 case DW_TAG_class_type:
20142 case DW_TAG_interface_type:
20143 case DW_TAG_structure_type:
20144 case DW_TAG_union_type:
20145 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20146 structures or unions. These were of the form "._%d" in GCC 4.1,
20147 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20148 and GCC 4.4. We work around this problem by ignoring these. */
20149 if (attr && DW_STRING (attr)
20150 && (startswith (DW_STRING (attr), "._")
20151 || startswith (DW_STRING (attr), "<anonymous")))
20154 /* GCC might emit a nameless typedef that has a linkage name. See
20155 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20156 if (!attr || DW_STRING (attr) == NULL)
20158 char *demangled = NULL;
20160 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
20162 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
20164 if (attr == NULL || DW_STRING (attr) == NULL)
20167 /* Avoid demangling DW_STRING (attr) the second time on a second
20168 call for the same DIE. */
20169 if (!DW_STRING_IS_CANONICAL (attr))
20170 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20176 /* FIXME: we already did this for the partial symbol... */
20179 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20180 demangled, strlen (demangled)));
20181 DW_STRING_IS_CANONICAL (attr) = 1;
20184 /* Strip any leading namespaces/classes, keep only the base name.
20185 DW_AT_name for named DIEs does not contain the prefixes. */
20186 base = strrchr (DW_STRING (attr), ':');
20187 if (base && base > DW_STRING (attr) && base[-1] == ':')
20190 return DW_STRING (attr);
20199 if (!DW_STRING_IS_CANONICAL (attr))
20202 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20203 &cu->objfile->per_bfd->storage_obstack);
20204 DW_STRING_IS_CANONICAL (attr) = 1;
20206 return DW_STRING (attr);
20209 /* Return the die that this die in an extension of, or NULL if there
20210 is none. *EXT_CU is the CU containing DIE on input, and the CU
20211 containing the return value on output. */
20213 static struct die_info *
20214 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20216 struct attribute *attr;
20218 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20222 return follow_die_ref (die, attr, ext_cu);
20225 /* Convert a DIE tag into its string name. */
20227 static const char *
20228 dwarf_tag_name (unsigned tag)
20230 const char *name = get_DW_TAG_name (tag);
20233 return "DW_TAG_<unknown>";
20238 /* Convert a DWARF attribute code into its string name. */
20240 static const char *
20241 dwarf_attr_name (unsigned attr)
20245 #ifdef MIPS /* collides with DW_AT_HP_block_index */
20246 if (attr == DW_AT_MIPS_fde)
20247 return "DW_AT_MIPS_fde";
20249 if (attr == DW_AT_HP_block_index)
20250 return "DW_AT_HP_block_index";
20253 name = get_DW_AT_name (attr);
20256 return "DW_AT_<unknown>";
20261 /* Convert a DWARF value form code into its string name. */
20263 static const char *
20264 dwarf_form_name (unsigned form)
20266 const char *name = get_DW_FORM_name (form);
20269 return "DW_FORM_<unknown>";
20274 static const char *
20275 dwarf_bool_name (unsigned mybool)
20283 /* Convert a DWARF type code into its string name. */
20285 static const char *
20286 dwarf_type_encoding_name (unsigned enc)
20288 const char *name = get_DW_ATE_name (enc);
20291 return "DW_ATE_<unknown>";
20297 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
20301 print_spaces (indent, f);
20302 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
20303 dwarf_tag_name (die->tag), die->abbrev,
20304 to_underlying (die->sect_off));
20306 if (die->parent != NULL)
20308 print_spaces (indent, f);
20309 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
20310 to_underlying (die->parent->sect_off));
20313 print_spaces (indent, f);
20314 fprintf_unfiltered (f, " has children: %s\n",
20315 dwarf_bool_name (die->child != NULL));
20317 print_spaces (indent, f);
20318 fprintf_unfiltered (f, " attributes:\n");
20320 for (i = 0; i < die->num_attrs; ++i)
20322 print_spaces (indent, f);
20323 fprintf_unfiltered (f, " %s (%s) ",
20324 dwarf_attr_name (die->attrs[i].name),
20325 dwarf_form_name (die->attrs[i].form));
20327 switch (die->attrs[i].form)
20330 case DW_FORM_GNU_addr_index:
20331 fprintf_unfiltered (f, "address: ");
20332 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
20334 case DW_FORM_block2:
20335 case DW_FORM_block4:
20336 case DW_FORM_block:
20337 case DW_FORM_block1:
20338 fprintf_unfiltered (f, "block: size %s",
20339 pulongest (DW_BLOCK (&die->attrs[i])->size));
20341 case DW_FORM_exprloc:
20342 fprintf_unfiltered (f, "expression: size %s",
20343 pulongest (DW_BLOCK (&die->attrs[i])->size));
20345 case DW_FORM_data16:
20346 fprintf_unfiltered (f, "constant of 16 bytes");
20348 case DW_FORM_ref_addr:
20349 fprintf_unfiltered (f, "ref address: ");
20350 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20352 case DW_FORM_GNU_ref_alt:
20353 fprintf_unfiltered (f, "alt ref address: ");
20354 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20360 case DW_FORM_ref_udata:
20361 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
20362 (long) (DW_UNSND (&die->attrs[i])));
20364 case DW_FORM_data1:
20365 case DW_FORM_data2:
20366 case DW_FORM_data4:
20367 case DW_FORM_data8:
20368 case DW_FORM_udata:
20369 case DW_FORM_sdata:
20370 fprintf_unfiltered (f, "constant: %s",
20371 pulongest (DW_UNSND (&die->attrs[i])));
20373 case DW_FORM_sec_offset:
20374 fprintf_unfiltered (f, "section offset: %s",
20375 pulongest (DW_UNSND (&die->attrs[i])));
20377 case DW_FORM_ref_sig8:
20378 fprintf_unfiltered (f, "signature: %s",
20379 hex_string (DW_SIGNATURE (&die->attrs[i])));
20381 case DW_FORM_string:
20383 case DW_FORM_line_strp:
20384 case DW_FORM_GNU_str_index:
20385 case DW_FORM_GNU_strp_alt:
20386 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
20387 DW_STRING (&die->attrs[i])
20388 ? DW_STRING (&die->attrs[i]) : "",
20389 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
20392 if (DW_UNSND (&die->attrs[i]))
20393 fprintf_unfiltered (f, "flag: TRUE");
20395 fprintf_unfiltered (f, "flag: FALSE");
20397 case DW_FORM_flag_present:
20398 fprintf_unfiltered (f, "flag: TRUE");
20400 case DW_FORM_indirect:
20401 /* The reader will have reduced the indirect form to
20402 the "base form" so this form should not occur. */
20403 fprintf_unfiltered (f,
20404 "unexpected attribute form: DW_FORM_indirect");
20407 fprintf_unfiltered (f, "unsupported attribute form: %d.",
20408 die->attrs[i].form);
20411 fprintf_unfiltered (f, "\n");
20416 dump_die_for_error (struct die_info *die)
20418 dump_die_shallow (gdb_stderr, 0, die);
20422 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
20424 int indent = level * 4;
20426 gdb_assert (die != NULL);
20428 if (level >= max_level)
20431 dump_die_shallow (f, indent, die);
20433 if (die->child != NULL)
20435 print_spaces (indent, f);
20436 fprintf_unfiltered (f, " Children:");
20437 if (level + 1 < max_level)
20439 fprintf_unfiltered (f, "\n");
20440 dump_die_1 (f, level + 1, max_level, die->child);
20444 fprintf_unfiltered (f,
20445 " [not printed, max nesting level reached]\n");
20449 if (die->sibling != NULL && level > 0)
20451 dump_die_1 (f, level, max_level, die->sibling);
20455 /* This is called from the pdie macro in gdbinit.in.
20456 It's not static so gcc will keep a copy callable from gdb. */
20459 dump_die (struct die_info *die, int max_level)
20461 dump_die_1 (gdb_stdlog, 0, max_level, die);
20465 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
20469 slot = htab_find_slot_with_hash (cu->die_hash, die,
20470 to_underlying (die->sect_off),
20476 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
20480 dwarf2_get_ref_die_offset (const struct attribute *attr)
20482 if (attr_form_is_ref (attr))
20483 return (sect_offset) DW_UNSND (attr);
20485 complaint (&symfile_complaints,
20486 _("unsupported die ref attribute form: '%s'"),
20487 dwarf_form_name (attr->form));
20491 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
20492 * the value held by the attribute is not constant. */
20495 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
20497 if (attr->form == DW_FORM_sdata)
20498 return DW_SND (attr);
20499 else if (attr->form == DW_FORM_udata
20500 || attr->form == DW_FORM_data1
20501 || attr->form == DW_FORM_data2
20502 || attr->form == DW_FORM_data4
20503 || attr->form == DW_FORM_data8)
20504 return DW_UNSND (attr);
20507 /* For DW_FORM_data16 see attr_form_is_constant. */
20508 complaint (&symfile_complaints,
20509 _("Attribute value is not a constant (%s)"),
20510 dwarf_form_name (attr->form));
20511 return default_value;
20515 /* Follow reference or signature attribute ATTR of SRC_DIE.
20516 On entry *REF_CU is the CU of SRC_DIE.
20517 On exit *REF_CU is the CU of the result. */
20519 static struct die_info *
20520 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
20521 struct dwarf2_cu **ref_cu)
20523 struct die_info *die;
20525 if (attr_form_is_ref (attr))
20526 die = follow_die_ref (src_die, attr, ref_cu);
20527 else if (attr->form == DW_FORM_ref_sig8)
20528 die = follow_die_sig (src_die, attr, ref_cu);
20531 dump_die_for_error (src_die);
20532 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
20533 objfile_name ((*ref_cu)->objfile));
20539 /* Follow reference OFFSET.
20540 On entry *REF_CU is the CU of the source die referencing OFFSET.
20541 On exit *REF_CU is the CU of the result.
20542 Returns NULL if OFFSET is invalid. */
20544 static struct die_info *
20545 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
20546 struct dwarf2_cu **ref_cu)
20548 struct die_info temp_die;
20549 struct dwarf2_cu *target_cu, *cu = *ref_cu;
20551 gdb_assert (cu->per_cu != NULL);
20555 if (cu->per_cu->is_debug_types)
20557 /* .debug_types CUs cannot reference anything outside their CU.
20558 If they need to, they have to reference a signatured type via
20559 DW_FORM_ref_sig8. */
20560 if (!offset_in_cu_p (&cu->header, sect_off))
20563 else if (offset_in_dwz != cu->per_cu->is_dwz
20564 || !offset_in_cu_p (&cu->header, sect_off))
20566 struct dwarf2_per_cu_data *per_cu;
20568 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
20571 /* If necessary, add it to the queue and load its DIEs. */
20572 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20573 load_full_comp_unit (per_cu, cu->language);
20575 target_cu = per_cu->cu;
20577 else if (cu->dies == NULL)
20579 /* We're loading full DIEs during partial symbol reading. */
20580 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20581 load_full_comp_unit (cu->per_cu, language_minimal);
20584 *ref_cu = target_cu;
20585 temp_die.sect_off = sect_off;
20586 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20588 to_underlying (sect_off));
20591 /* Follow reference attribute ATTR of SRC_DIE.
20592 On entry *REF_CU is the CU of SRC_DIE.
20593 On exit *REF_CU is the CU of the result. */
20595 static struct die_info *
20596 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20597 struct dwarf2_cu **ref_cu)
20599 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20600 struct dwarf2_cu *cu = *ref_cu;
20601 struct die_info *die;
20603 die = follow_die_offset (sect_off,
20604 (attr->form == DW_FORM_GNU_ref_alt
20605 || cu->per_cu->is_dwz),
20608 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20609 "at 0x%x [in module %s]"),
20610 to_underlying (sect_off), to_underlying (src_die->sect_off),
20611 objfile_name (cu->objfile));
20616 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
20617 Returned value is intended for DW_OP_call*. Returned
20618 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20620 struct dwarf2_locexpr_baton
20621 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
20622 struct dwarf2_per_cu_data *per_cu,
20623 CORE_ADDR (*get_frame_pc) (void *baton),
20626 struct dwarf2_cu *cu;
20627 struct die_info *die;
20628 struct attribute *attr;
20629 struct dwarf2_locexpr_baton retval;
20631 dw2_setup (per_cu->objfile);
20633 if (per_cu->cu == NULL)
20638 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20639 Instead just throw an error, not much else we can do. */
20640 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20641 to_underlying (sect_off), objfile_name (per_cu->objfile));
20644 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20646 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20647 to_underlying (sect_off), objfile_name (per_cu->objfile));
20649 attr = dwarf2_attr (die, DW_AT_location, cu);
20652 /* DWARF: "If there is no such attribute, then there is no effect.".
20653 DATA is ignored if SIZE is 0. */
20655 retval.data = NULL;
20658 else if (attr_form_is_section_offset (attr))
20660 struct dwarf2_loclist_baton loclist_baton;
20661 CORE_ADDR pc = (*get_frame_pc) (baton);
20664 fill_in_loclist_baton (cu, &loclist_baton, attr);
20666 retval.data = dwarf2_find_location_expression (&loclist_baton,
20668 retval.size = size;
20672 if (!attr_form_is_block (attr))
20673 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20674 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20675 to_underlying (sect_off), objfile_name (per_cu->objfile));
20677 retval.data = DW_BLOCK (attr)->data;
20678 retval.size = DW_BLOCK (attr)->size;
20680 retval.per_cu = cu->per_cu;
20682 age_cached_comp_units ();
20687 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20690 struct dwarf2_locexpr_baton
20691 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20692 struct dwarf2_per_cu_data *per_cu,
20693 CORE_ADDR (*get_frame_pc) (void *baton),
20696 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
20698 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
20701 /* Write a constant of a given type as target-ordered bytes into
20704 static const gdb_byte *
20705 write_constant_as_bytes (struct obstack *obstack,
20706 enum bfd_endian byte_order,
20713 *len = TYPE_LENGTH (type);
20714 result = (gdb_byte *) obstack_alloc (obstack, *len);
20715 store_unsigned_integer (result, *len, byte_order, value);
20720 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20721 pointer to the constant bytes and set LEN to the length of the
20722 data. If memory is needed, allocate it on OBSTACK. If the DIE
20723 does not have a DW_AT_const_value, return NULL. */
20726 dwarf2_fetch_constant_bytes (sect_offset sect_off,
20727 struct dwarf2_per_cu_data *per_cu,
20728 struct obstack *obstack,
20731 struct dwarf2_cu *cu;
20732 struct die_info *die;
20733 struct attribute *attr;
20734 const gdb_byte *result = NULL;
20737 enum bfd_endian byte_order;
20739 dw2_setup (per_cu->objfile);
20741 if (per_cu->cu == NULL)
20746 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20747 Instead just throw an error, not much else we can do. */
20748 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20749 to_underlying (sect_off), objfile_name (per_cu->objfile));
20752 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20754 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20755 to_underlying (sect_off), objfile_name (per_cu->objfile));
20758 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20762 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20763 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20765 switch (attr->form)
20768 case DW_FORM_GNU_addr_index:
20772 *len = cu->header.addr_size;
20773 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20774 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20778 case DW_FORM_string:
20780 case DW_FORM_GNU_str_index:
20781 case DW_FORM_GNU_strp_alt:
20782 /* DW_STRING is already allocated on the objfile obstack, point
20784 result = (const gdb_byte *) DW_STRING (attr);
20785 *len = strlen (DW_STRING (attr));
20787 case DW_FORM_block1:
20788 case DW_FORM_block2:
20789 case DW_FORM_block4:
20790 case DW_FORM_block:
20791 case DW_FORM_exprloc:
20792 case DW_FORM_data16:
20793 result = DW_BLOCK (attr)->data;
20794 *len = DW_BLOCK (attr)->size;
20797 /* The DW_AT_const_value attributes are supposed to carry the
20798 symbol's value "represented as it would be on the target
20799 architecture." By the time we get here, it's already been
20800 converted to host endianness, so we just need to sign- or
20801 zero-extend it as appropriate. */
20802 case DW_FORM_data1:
20803 type = die_type (die, cu);
20804 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20805 if (result == NULL)
20806 result = write_constant_as_bytes (obstack, byte_order,
20809 case DW_FORM_data2:
20810 type = die_type (die, cu);
20811 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20812 if (result == NULL)
20813 result = write_constant_as_bytes (obstack, byte_order,
20816 case DW_FORM_data4:
20817 type = die_type (die, cu);
20818 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20819 if (result == NULL)
20820 result = write_constant_as_bytes (obstack, byte_order,
20823 case DW_FORM_data8:
20824 type = die_type (die, cu);
20825 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20826 if (result == NULL)
20827 result = write_constant_as_bytes (obstack, byte_order,
20831 case DW_FORM_sdata:
20832 type = die_type (die, cu);
20833 result = write_constant_as_bytes (obstack, byte_order,
20834 type, DW_SND (attr), len);
20837 case DW_FORM_udata:
20838 type = die_type (die, cu);
20839 result = write_constant_as_bytes (obstack, byte_order,
20840 type, DW_UNSND (attr), len);
20844 complaint (&symfile_complaints,
20845 _("unsupported const value attribute form: '%s'"),
20846 dwarf_form_name (attr->form));
20853 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
20854 valid type for this die is found. */
20857 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
20858 struct dwarf2_per_cu_data *per_cu)
20860 struct dwarf2_cu *cu;
20861 struct die_info *die;
20863 dw2_setup (per_cu->objfile);
20865 if (per_cu->cu == NULL)
20871 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20875 return die_type (die, cu);
20878 /* Return the type of the DIE at DIE_OFFSET in the CU named by
20882 dwarf2_get_die_type (cu_offset die_offset,
20883 struct dwarf2_per_cu_data *per_cu)
20885 dw2_setup (per_cu->objfile);
20887 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
20888 return get_die_type_at_offset (die_offset_sect, per_cu);
20891 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
20892 On entry *REF_CU is the CU of SRC_DIE.
20893 On exit *REF_CU is the CU of the result.
20894 Returns NULL if the referenced DIE isn't found. */
20896 static struct die_info *
20897 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
20898 struct dwarf2_cu **ref_cu)
20900 struct die_info temp_die;
20901 struct dwarf2_cu *sig_cu;
20902 struct die_info *die;
20904 /* While it might be nice to assert sig_type->type == NULL here,
20905 we can get here for DW_AT_imported_declaration where we need
20906 the DIE not the type. */
20908 /* If necessary, add it to the queue and load its DIEs. */
20910 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
20911 read_signatured_type (sig_type);
20913 sig_cu = sig_type->per_cu.cu;
20914 gdb_assert (sig_cu != NULL);
20915 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
20916 temp_die.sect_off = sig_type->type_offset_in_section;
20917 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
20918 to_underlying (temp_die.sect_off));
20921 /* For .gdb_index version 7 keep track of included TUs.
20922 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
20923 if (dwarf2_per_objfile->index_table != NULL
20924 && dwarf2_per_objfile->index_table->version <= 7)
20926 VEC_safe_push (dwarf2_per_cu_ptr,
20927 (*ref_cu)->per_cu->imported_symtabs,
20938 /* Follow signatured type referenced by ATTR in SRC_DIE.
20939 On entry *REF_CU is the CU of SRC_DIE.
20940 On exit *REF_CU is the CU of the result.
20941 The result is the DIE of the type.
20942 If the referenced type cannot be found an error is thrown. */
20944 static struct die_info *
20945 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
20946 struct dwarf2_cu **ref_cu)
20948 ULONGEST signature = DW_SIGNATURE (attr);
20949 struct signatured_type *sig_type;
20950 struct die_info *die;
20952 gdb_assert (attr->form == DW_FORM_ref_sig8);
20954 sig_type = lookup_signatured_type (*ref_cu, signature);
20955 /* sig_type will be NULL if the signatured type is missing from
20957 if (sig_type == NULL)
20959 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
20960 " from DIE at 0x%x [in module %s]"),
20961 hex_string (signature), to_underlying (src_die->sect_off),
20962 objfile_name ((*ref_cu)->objfile));
20965 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
20968 dump_die_for_error (src_die);
20969 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
20970 " from DIE at 0x%x [in module %s]"),
20971 hex_string (signature), to_underlying (src_die->sect_off),
20972 objfile_name ((*ref_cu)->objfile));
20978 /* Get the type specified by SIGNATURE referenced in DIE/CU,
20979 reading in and processing the type unit if necessary. */
20981 static struct type *
20982 get_signatured_type (struct die_info *die, ULONGEST signature,
20983 struct dwarf2_cu *cu)
20985 struct signatured_type *sig_type;
20986 struct dwarf2_cu *type_cu;
20987 struct die_info *type_die;
20990 sig_type = lookup_signatured_type (cu, signature);
20991 /* sig_type will be NULL if the signatured type is missing from
20993 if (sig_type == NULL)
20995 complaint (&symfile_complaints,
20996 _("Dwarf Error: Cannot find signatured DIE %s referenced"
20997 " from DIE at 0x%x [in module %s]"),
20998 hex_string (signature), to_underlying (die->sect_off),
20999 objfile_name (dwarf2_per_objfile->objfile));
21000 return build_error_marker_type (cu, die);
21003 /* If we already know the type we're done. */
21004 if (sig_type->type != NULL)
21005 return sig_type->type;
21008 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21009 if (type_die != NULL)
21011 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21012 is created. This is important, for example, because for c++ classes
21013 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21014 type = read_type_die (type_die, type_cu);
21017 complaint (&symfile_complaints,
21018 _("Dwarf Error: Cannot build signatured type %s"
21019 " referenced from DIE at 0x%x [in module %s]"),
21020 hex_string (signature), to_underlying (die->sect_off),
21021 objfile_name (dwarf2_per_objfile->objfile));
21022 type = build_error_marker_type (cu, die);
21027 complaint (&symfile_complaints,
21028 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21029 " from DIE at 0x%x [in module %s]"),
21030 hex_string (signature), to_underlying (die->sect_off),
21031 objfile_name (dwarf2_per_objfile->objfile));
21032 type = build_error_marker_type (cu, die);
21034 sig_type->type = type;
21039 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21040 reading in and processing the type unit if necessary. */
21042 static struct type *
21043 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21044 struct dwarf2_cu *cu) /* ARI: editCase function */
21046 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21047 if (attr_form_is_ref (attr))
21049 struct dwarf2_cu *type_cu = cu;
21050 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21052 return read_type_die (type_die, type_cu);
21054 else if (attr->form == DW_FORM_ref_sig8)
21056 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21060 complaint (&symfile_complaints,
21061 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21062 " at 0x%x [in module %s]"),
21063 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21064 objfile_name (dwarf2_per_objfile->objfile));
21065 return build_error_marker_type (cu, die);
21069 /* Load the DIEs associated with type unit PER_CU into memory. */
21072 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21074 struct signatured_type *sig_type;
21076 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21077 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21079 /* We have the per_cu, but we need the signatured_type.
21080 Fortunately this is an easy translation. */
21081 gdb_assert (per_cu->is_debug_types);
21082 sig_type = (struct signatured_type *) per_cu;
21084 gdb_assert (per_cu->cu == NULL);
21086 read_signatured_type (sig_type);
21088 gdb_assert (per_cu->cu != NULL);
21091 /* die_reader_func for read_signatured_type.
21092 This is identical to load_full_comp_unit_reader,
21093 but is kept separate for now. */
21096 read_signatured_type_reader (const struct die_reader_specs *reader,
21097 const gdb_byte *info_ptr,
21098 struct die_info *comp_unit_die,
21102 struct dwarf2_cu *cu = reader->cu;
21104 gdb_assert (cu->die_hash == NULL);
21106 htab_create_alloc_ex (cu->header.length / 12,
21110 &cu->comp_unit_obstack,
21111 hashtab_obstack_allocate,
21112 dummy_obstack_deallocate);
21115 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21116 &info_ptr, comp_unit_die);
21117 cu->dies = comp_unit_die;
21118 /* comp_unit_die is not stored in die_hash, no need. */
21120 /* We try not to read any attributes in this function, because not
21121 all CUs needed for references have been loaded yet, and symbol
21122 table processing isn't initialized. But we have to set the CU language,
21123 or we won't be able to build types correctly.
21124 Similarly, if we do not read the producer, we can not apply
21125 producer-specific interpretation. */
21126 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21129 /* Read in a signatured type and build its CU and DIEs.
21130 If the type is a stub for the real type in a DWO file,
21131 read in the real type from the DWO file as well. */
21134 read_signatured_type (struct signatured_type *sig_type)
21136 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21138 gdb_assert (per_cu->is_debug_types);
21139 gdb_assert (per_cu->cu == NULL);
21141 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21142 read_signatured_type_reader, NULL);
21143 sig_type->per_cu.tu_read = 1;
21146 /* Decode simple location descriptions.
21147 Given a pointer to a dwarf block that defines a location, compute
21148 the location and return the value.
21150 NOTE drow/2003-11-18: This function is called in two situations
21151 now: for the address of static or global variables (partial symbols
21152 only) and for offsets into structures which are expected to be
21153 (more or less) constant. The partial symbol case should go away,
21154 and only the constant case should remain. That will let this
21155 function complain more accurately. A few special modes are allowed
21156 without complaint for global variables (for instance, global
21157 register values and thread-local values).
21159 A location description containing no operations indicates that the
21160 object is optimized out. The return value is 0 for that case.
21161 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21162 callers will only want a very basic result and this can become a
21165 Note that stack[0] is unused except as a default error return. */
21168 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21170 struct objfile *objfile = cu->objfile;
21172 size_t size = blk->size;
21173 const gdb_byte *data = blk->data;
21174 CORE_ADDR stack[64];
21176 unsigned int bytes_read, unsnd;
21182 stack[++stacki] = 0;
21221 stack[++stacki] = op - DW_OP_lit0;
21256 stack[++stacki] = op - DW_OP_reg0;
21258 dwarf2_complex_location_expr_complaint ();
21262 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
21264 stack[++stacki] = unsnd;
21266 dwarf2_complex_location_expr_complaint ();
21270 stack[++stacki] = read_address (objfile->obfd, &data[i],
21275 case DW_OP_const1u:
21276 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
21280 case DW_OP_const1s:
21281 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
21285 case DW_OP_const2u:
21286 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
21290 case DW_OP_const2s:
21291 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
21295 case DW_OP_const4u:
21296 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
21300 case DW_OP_const4s:
21301 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
21305 case DW_OP_const8u:
21306 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
21311 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
21317 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
21322 stack[stacki + 1] = stack[stacki];
21327 stack[stacki - 1] += stack[stacki];
21331 case DW_OP_plus_uconst:
21332 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
21338 stack[stacki - 1] -= stack[stacki];
21343 /* If we're not the last op, then we definitely can't encode
21344 this using GDB's address_class enum. This is valid for partial
21345 global symbols, although the variable's address will be bogus
21348 dwarf2_complex_location_expr_complaint ();
21351 case DW_OP_GNU_push_tls_address:
21352 case DW_OP_form_tls_address:
21353 /* The top of the stack has the offset from the beginning
21354 of the thread control block at which the variable is located. */
21355 /* Nothing should follow this operator, so the top of stack would
21357 /* This is valid for partial global symbols, but the variable's
21358 address will be bogus in the psymtab. Make it always at least
21359 non-zero to not look as a variable garbage collected by linker
21360 which have DW_OP_addr 0. */
21362 dwarf2_complex_location_expr_complaint ();
21366 case DW_OP_GNU_uninit:
21369 case DW_OP_GNU_addr_index:
21370 case DW_OP_GNU_const_index:
21371 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
21378 const char *name = get_DW_OP_name (op);
21381 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
21384 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
21388 return (stack[stacki]);
21391 /* Enforce maximum stack depth of SIZE-1 to avoid writing
21392 outside of the allocated space. Also enforce minimum>0. */
21393 if (stacki >= ARRAY_SIZE (stack) - 1)
21395 complaint (&symfile_complaints,
21396 _("location description stack overflow"));
21402 complaint (&symfile_complaints,
21403 _("location description stack underflow"));
21407 return (stack[stacki]);
21410 /* memory allocation interface */
21412 static struct dwarf_block *
21413 dwarf_alloc_block (struct dwarf2_cu *cu)
21415 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
21418 static struct die_info *
21419 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
21421 struct die_info *die;
21422 size_t size = sizeof (struct die_info);
21425 size += (num_attrs - 1) * sizeof (struct attribute);
21427 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
21428 memset (die, 0, sizeof (struct die_info));
21433 /* Macro support. */
21435 /* Return file name relative to the compilation directory of file number I in
21436 *LH's file name table. The result is allocated using xmalloc; the caller is
21437 responsible for freeing it. */
21440 file_file_name (int file, struct line_header *lh)
21442 /* Is the file number a valid index into the line header's file name
21443 table? Remember that file numbers start with one, not zero. */
21444 if (1 <= file && file <= lh->file_names.size ())
21446 const file_entry &fe = lh->file_names[file - 1];
21448 if (!IS_ABSOLUTE_PATH (fe.name))
21450 const char *dir = fe.include_dir (lh);
21452 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
21454 return xstrdup (fe.name);
21458 /* The compiler produced a bogus file number. We can at least
21459 record the macro definitions made in the file, even if we
21460 won't be able to find the file by name. */
21461 char fake_name[80];
21463 xsnprintf (fake_name, sizeof (fake_name),
21464 "<bad macro file number %d>", file);
21466 complaint (&symfile_complaints,
21467 _("bad file number in macro information (%d)"),
21470 return xstrdup (fake_name);
21474 /* Return the full name of file number I in *LH's file name table.
21475 Use COMP_DIR as the name of the current directory of the
21476 compilation. The result is allocated using xmalloc; the caller is
21477 responsible for freeing it. */
21479 file_full_name (int file, struct line_header *lh, const char *comp_dir)
21481 /* Is the file number a valid index into the line header's file name
21482 table? Remember that file numbers start with one, not zero. */
21483 if (1 <= file && file <= lh->file_names.size ())
21485 char *relative = file_file_name (file, lh);
21487 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
21489 return reconcat (relative, comp_dir, SLASH_STRING,
21490 relative, (char *) NULL);
21493 return file_file_name (file, lh);
21497 static struct macro_source_file *
21498 macro_start_file (int file, int line,
21499 struct macro_source_file *current_file,
21500 struct line_header *lh)
21502 /* File name relative to the compilation directory of this source file. */
21503 char *file_name = file_file_name (file, lh);
21505 if (! current_file)
21507 /* Note: We don't create a macro table for this compilation unit
21508 at all until we actually get a filename. */
21509 struct macro_table *macro_table = get_macro_table ();
21511 /* If we have no current file, then this must be the start_file
21512 directive for the compilation unit's main source file. */
21513 current_file = macro_set_main (macro_table, file_name);
21514 macro_define_special (macro_table);
21517 current_file = macro_include (current_file, line, file_name);
21521 return current_file;
21525 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
21526 followed by a null byte. */
21528 copy_string (const char *buf, int len)
21530 char *s = (char *) xmalloc (len + 1);
21532 memcpy (s, buf, len);
21538 static const char *
21539 consume_improper_spaces (const char *p, const char *body)
21543 complaint (&symfile_complaints,
21544 _("macro definition contains spaces "
21545 "in formal argument list:\n`%s'"),
21557 parse_macro_definition (struct macro_source_file *file, int line,
21562 /* The body string takes one of two forms. For object-like macro
21563 definitions, it should be:
21565 <macro name> " " <definition>
21567 For function-like macro definitions, it should be:
21569 <macro name> "() " <definition>
21571 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
21573 Spaces may appear only where explicitly indicated, and in the
21576 The Dwarf 2 spec says that an object-like macro's name is always
21577 followed by a space, but versions of GCC around March 2002 omit
21578 the space when the macro's definition is the empty string.
21580 The Dwarf 2 spec says that there should be no spaces between the
21581 formal arguments in a function-like macro's formal argument list,
21582 but versions of GCC around March 2002 include spaces after the
21586 /* Find the extent of the macro name. The macro name is terminated
21587 by either a space or null character (for an object-like macro) or
21588 an opening paren (for a function-like macro). */
21589 for (p = body; *p; p++)
21590 if (*p == ' ' || *p == '(')
21593 if (*p == ' ' || *p == '\0')
21595 /* It's an object-like macro. */
21596 int name_len = p - body;
21597 char *name = copy_string (body, name_len);
21598 const char *replacement;
21601 replacement = body + name_len + 1;
21604 dwarf2_macro_malformed_definition_complaint (body);
21605 replacement = body + name_len;
21608 macro_define_object (file, line, name, replacement);
21612 else if (*p == '(')
21614 /* It's a function-like macro. */
21615 char *name = copy_string (body, p - body);
21618 char **argv = XNEWVEC (char *, argv_size);
21622 p = consume_improper_spaces (p, body);
21624 /* Parse the formal argument list. */
21625 while (*p && *p != ')')
21627 /* Find the extent of the current argument name. */
21628 const char *arg_start = p;
21630 while (*p && *p != ',' && *p != ')' && *p != ' ')
21633 if (! *p || p == arg_start)
21634 dwarf2_macro_malformed_definition_complaint (body);
21637 /* Make sure argv has room for the new argument. */
21638 if (argc >= argv_size)
21641 argv = XRESIZEVEC (char *, argv, argv_size);
21644 argv[argc++] = copy_string (arg_start, p - arg_start);
21647 p = consume_improper_spaces (p, body);
21649 /* Consume the comma, if present. */
21654 p = consume_improper_spaces (p, body);
21663 /* Perfectly formed definition, no complaints. */
21664 macro_define_function (file, line, name,
21665 argc, (const char **) argv,
21667 else if (*p == '\0')
21669 /* Complain, but do define it. */
21670 dwarf2_macro_malformed_definition_complaint (body);
21671 macro_define_function (file, line, name,
21672 argc, (const char **) argv,
21676 /* Just complain. */
21677 dwarf2_macro_malformed_definition_complaint (body);
21680 /* Just complain. */
21681 dwarf2_macro_malformed_definition_complaint (body);
21687 for (i = 0; i < argc; i++)
21693 dwarf2_macro_malformed_definition_complaint (body);
21696 /* Skip some bytes from BYTES according to the form given in FORM.
21697 Returns the new pointer. */
21699 static const gdb_byte *
21700 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21701 enum dwarf_form form,
21702 unsigned int offset_size,
21703 struct dwarf2_section_info *section)
21705 unsigned int bytes_read;
21709 case DW_FORM_data1:
21714 case DW_FORM_data2:
21718 case DW_FORM_data4:
21722 case DW_FORM_data8:
21726 case DW_FORM_data16:
21730 case DW_FORM_string:
21731 read_direct_string (abfd, bytes, &bytes_read);
21732 bytes += bytes_read;
21735 case DW_FORM_sec_offset:
21737 case DW_FORM_GNU_strp_alt:
21738 bytes += offset_size;
21741 case DW_FORM_block:
21742 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21743 bytes += bytes_read;
21746 case DW_FORM_block1:
21747 bytes += 1 + read_1_byte (abfd, bytes);
21749 case DW_FORM_block2:
21750 bytes += 2 + read_2_bytes (abfd, bytes);
21752 case DW_FORM_block4:
21753 bytes += 4 + read_4_bytes (abfd, bytes);
21756 case DW_FORM_sdata:
21757 case DW_FORM_udata:
21758 case DW_FORM_GNU_addr_index:
21759 case DW_FORM_GNU_str_index:
21760 bytes = gdb_skip_leb128 (bytes, buffer_end);
21763 dwarf2_section_buffer_overflow_complaint (section);
21771 complaint (&symfile_complaints,
21772 _("invalid form 0x%x in `%s'"),
21773 form, get_section_name (section));
21781 /* A helper for dwarf_decode_macros that handles skipping an unknown
21782 opcode. Returns an updated pointer to the macro data buffer; or,
21783 on error, issues a complaint and returns NULL. */
21785 static const gdb_byte *
21786 skip_unknown_opcode (unsigned int opcode,
21787 const gdb_byte **opcode_definitions,
21788 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21790 unsigned int offset_size,
21791 struct dwarf2_section_info *section)
21793 unsigned int bytes_read, i;
21795 const gdb_byte *defn;
21797 if (opcode_definitions[opcode] == NULL)
21799 complaint (&symfile_complaints,
21800 _("unrecognized DW_MACFINO opcode 0x%x"),
21805 defn = opcode_definitions[opcode];
21806 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21807 defn += bytes_read;
21809 for (i = 0; i < arg; ++i)
21811 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21812 (enum dwarf_form) defn[i], offset_size,
21814 if (mac_ptr == NULL)
21816 /* skip_form_bytes already issued the complaint. */
21824 /* A helper function which parses the header of a macro section.
21825 If the macro section is the extended (for now called "GNU") type,
21826 then this updates *OFFSET_SIZE. Returns a pointer to just after
21827 the header, or issues a complaint and returns NULL on error. */
21829 static const gdb_byte *
21830 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
21832 const gdb_byte *mac_ptr,
21833 unsigned int *offset_size,
21834 int section_is_gnu)
21836 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
21838 if (section_is_gnu)
21840 unsigned int version, flags;
21842 version = read_2_bytes (abfd, mac_ptr);
21843 if (version != 4 && version != 5)
21845 complaint (&symfile_complaints,
21846 _("unrecognized version `%d' in .debug_macro section"),
21852 flags = read_1_byte (abfd, mac_ptr);
21854 *offset_size = (flags & 1) ? 8 : 4;
21856 if ((flags & 2) != 0)
21857 /* We don't need the line table offset. */
21858 mac_ptr += *offset_size;
21860 /* Vendor opcode descriptions. */
21861 if ((flags & 4) != 0)
21863 unsigned int i, count;
21865 count = read_1_byte (abfd, mac_ptr);
21867 for (i = 0; i < count; ++i)
21869 unsigned int opcode, bytes_read;
21872 opcode = read_1_byte (abfd, mac_ptr);
21874 opcode_definitions[opcode] = mac_ptr;
21875 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21876 mac_ptr += bytes_read;
21885 /* A helper for dwarf_decode_macros that handles the GNU extensions,
21886 including DW_MACRO_import. */
21889 dwarf_decode_macro_bytes (bfd *abfd,
21890 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21891 struct macro_source_file *current_file,
21892 struct line_header *lh,
21893 struct dwarf2_section_info *section,
21894 int section_is_gnu, int section_is_dwz,
21895 unsigned int offset_size,
21896 htab_t include_hash)
21898 struct objfile *objfile = dwarf2_per_objfile->objfile;
21899 enum dwarf_macro_record_type macinfo_type;
21900 int at_commandline;
21901 const gdb_byte *opcode_definitions[256];
21903 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
21904 &offset_size, section_is_gnu);
21905 if (mac_ptr == NULL)
21907 /* We already issued a complaint. */
21911 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
21912 GDB is still reading the definitions from command line. First
21913 DW_MACINFO_start_file will need to be ignored as it was already executed
21914 to create CURRENT_FILE for the main source holding also the command line
21915 definitions. On first met DW_MACINFO_start_file this flag is reset to
21916 normally execute all the remaining DW_MACINFO_start_file macinfos. */
21918 at_commandline = 1;
21922 /* Do we at least have room for a macinfo type byte? */
21923 if (mac_ptr >= mac_end)
21925 dwarf2_section_buffer_overflow_complaint (section);
21929 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
21932 /* Note that we rely on the fact that the corresponding GNU and
21933 DWARF constants are the same. */
21934 switch (macinfo_type)
21936 /* A zero macinfo type indicates the end of the macro
21941 case DW_MACRO_define:
21942 case DW_MACRO_undef:
21943 case DW_MACRO_define_strp:
21944 case DW_MACRO_undef_strp:
21945 case DW_MACRO_define_sup:
21946 case DW_MACRO_undef_sup:
21948 unsigned int bytes_read;
21953 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21954 mac_ptr += bytes_read;
21956 if (macinfo_type == DW_MACRO_define
21957 || macinfo_type == DW_MACRO_undef)
21959 body = read_direct_string (abfd, mac_ptr, &bytes_read);
21960 mac_ptr += bytes_read;
21964 LONGEST str_offset;
21966 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
21967 mac_ptr += offset_size;
21969 if (macinfo_type == DW_MACRO_define_sup
21970 || macinfo_type == DW_MACRO_undef_sup
21973 struct dwz_file *dwz = dwarf2_get_dwz_file ();
21975 body = read_indirect_string_from_dwz (dwz, str_offset);
21978 body = read_indirect_string_at_offset (abfd, str_offset);
21981 is_define = (macinfo_type == DW_MACRO_define
21982 || macinfo_type == DW_MACRO_define_strp
21983 || macinfo_type == DW_MACRO_define_sup);
21984 if (! current_file)
21986 /* DWARF violation as no main source is present. */
21987 complaint (&symfile_complaints,
21988 _("debug info with no main source gives macro %s "
21990 is_define ? _("definition") : _("undefinition"),
21994 if ((line == 0 && !at_commandline)
21995 || (line != 0 && at_commandline))
21996 complaint (&symfile_complaints,
21997 _("debug info gives %s macro %s with %s line %d: %s"),
21998 at_commandline ? _("command-line") : _("in-file"),
21999 is_define ? _("definition") : _("undefinition"),
22000 line == 0 ? _("zero") : _("non-zero"), line, body);
22003 parse_macro_definition (current_file, line, body);
22006 gdb_assert (macinfo_type == DW_MACRO_undef
22007 || macinfo_type == DW_MACRO_undef_strp
22008 || macinfo_type == DW_MACRO_undef_sup);
22009 macro_undef (current_file, line, body);
22014 case DW_MACRO_start_file:
22016 unsigned int bytes_read;
22019 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22020 mac_ptr += bytes_read;
22021 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22022 mac_ptr += bytes_read;
22024 if ((line == 0 && !at_commandline)
22025 || (line != 0 && at_commandline))
22026 complaint (&symfile_complaints,
22027 _("debug info gives source %d included "
22028 "from %s at %s line %d"),
22029 file, at_commandline ? _("command-line") : _("file"),
22030 line == 0 ? _("zero") : _("non-zero"), line);
22032 if (at_commandline)
22034 /* This DW_MACRO_start_file was executed in the
22036 at_commandline = 0;
22039 current_file = macro_start_file (file, line, current_file, lh);
22043 case DW_MACRO_end_file:
22044 if (! current_file)
22045 complaint (&symfile_complaints,
22046 _("macro debug info has an unmatched "
22047 "`close_file' directive"));
22050 current_file = current_file->included_by;
22051 if (! current_file)
22053 enum dwarf_macro_record_type next_type;
22055 /* GCC circa March 2002 doesn't produce the zero
22056 type byte marking the end of the compilation
22057 unit. Complain if it's not there, but exit no
22060 /* Do we at least have room for a macinfo type byte? */
22061 if (mac_ptr >= mac_end)
22063 dwarf2_section_buffer_overflow_complaint (section);
22067 /* We don't increment mac_ptr here, so this is just
22070 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22072 if (next_type != 0)
22073 complaint (&symfile_complaints,
22074 _("no terminating 0-type entry for "
22075 "macros in `.debug_macinfo' section"));
22082 case DW_MACRO_import:
22083 case DW_MACRO_import_sup:
22087 bfd *include_bfd = abfd;
22088 struct dwarf2_section_info *include_section = section;
22089 const gdb_byte *include_mac_end = mac_end;
22090 int is_dwz = section_is_dwz;
22091 const gdb_byte *new_mac_ptr;
22093 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22094 mac_ptr += offset_size;
22096 if (macinfo_type == DW_MACRO_import_sup)
22098 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22100 dwarf2_read_section (objfile, &dwz->macro);
22102 include_section = &dwz->macro;
22103 include_bfd = get_section_bfd_owner (include_section);
22104 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22108 new_mac_ptr = include_section->buffer + offset;
22109 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22113 /* This has actually happened; see
22114 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22115 complaint (&symfile_complaints,
22116 _("recursive DW_MACRO_import in "
22117 ".debug_macro section"));
22121 *slot = (void *) new_mac_ptr;
22123 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22124 include_mac_end, current_file, lh,
22125 section, section_is_gnu, is_dwz,
22126 offset_size, include_hash);
22128 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22133 case DW_MACINFO_vendor_ext:
22134 if (!section_is_gnu)
22136 unsigned int bytes_read;
22138 /* This reads the constant, but since we don't recognize
22139 any vendor extensions, we ignore it. */
22140 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22141 mac_ptr += bytes_read;
22142 read_direct_string (abfd, mac_ptr, &bytes_read);
22143 mac_ptr += bytes_read;
22145 /* We don't recognize any vendor extensions. */
22151 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22152 mac_ptr, mac_end, abfd, offset_size,
22154 if (mac_ptr == NULL)
22158 } while (macinfo_type != 0);
22162 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22163 int section_is_gnu)
22165 struct objfile *objfile = dwarf2_per_objfile->objfile;
22166 struct line_header *lh = cu->line_header;
22168 const gdb_byte *mac_ptr, *mac_end;
22169 struct macro_source_file *current_file = 0;
22170 enum dwarf_macro_record_type macinfo_type;
22171 unsigned int offset_size = cu->header.offset_size;
22172 const gdb_byte *opcode_definitions[256];
22173 struct cleanup *cleanup;
22175 struct dwarf2_section_info *section;
22176 const char *section_name;
22178 if (cu->dwo_unit != NULL)
22180 if (section_is_gnu)
22182 section = &cu->dwo_unit->dwo_file->sections.macro;
22183 section_name = ".debug_macro.dwo";
22187 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22188 section_name = ".debug_macinfo.dwo";
22193 if (section_is_gnu)
22195 section = &dwarf2_per_objfile->macro;
22196 section_name = ".debug_macro";
22200 section = &dwarf2_per_objfile->macinfo;
22201 section_name = ".debug_macinfo";
22205 dwarf2_read_section (objfile, section);
22206 if (section->buffer == NULL)
22208 complaint (&symfile_complaints, _("missing %s section"), section_name);
22211 abfd = get_section_bfd_owner (section);
22213 /* First pass: Find the name of the base filename.
22214 This filename is needed in order to process all macros whose definition
22215 (or undefinition) comes from the command line. These macros are defined
22216 before the first DW_MACINFO_start_file entry, and yet still need to be
22217 associated to the base file.
22219 To determine the base file name, we scan the macro definitions until we
22220 reach the first DW_MACINFO_start_file entry. We then initialize
22221 CURRENT_FILE accordingly so that any macro definition found before the
22222 first DW_MACINFO_start_file can still be associated to the base file. */
22224 mac_ptr = section->buffer + offset;
22225 mac_end = section->buffer + section->size;
22227 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22228 &offset_size, section_is_gnu);
22229 if (mac_ptr == NULL)
22231 /* We already issued a complaint. */
22237 /* Do we at least have room for a macinfo type byte? */
22238 if (mac_ptr >= mac_end)
22240 /* Complaint is printed during the second pass as GDB will probably
22241 stop the first pass earlier upon finding
22242 DW_MACINFO_start_file. */
22246 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22249 /* Note that we rely on the fact that the corresponding GNU and
22250 DWARF constants are the same. */
22251 switch (macinfo_type)
22253 /* A zero macinfo type indicates the end of the macro
22258 case DW_MACRO_define:
22259 case DW_MACRO_undef:
22260 /* Only skip the data by MAC_PTR. */
22262 unsigned int bytes_read;
22264 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22265 mac_ptr += bytes_read;
22266 read_direct_string (abfd, mac_ptr, &bytes_read);
22267 mac_ptr += bytes_read;
22271 case DW_MACRO_start_file:
22273 unsigned int bytes_read;
22276 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22277 mac_ptr += bytes_read;
22278 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22279 mac_ptr += bytes_read;
22281 current_file = macro_start_file (file, line, current_file, lh);
22285 case DW_MACRO_end_file:
22286 /* No data to skip by MAC_PTR. */
22289 case DW_MACRO_define_strp:
22290 case DW_MACRO_undef_strp:
22291 case DW_MACRO_define_sup:
22292 case DW_MACRO_undef_sup:
22294 unsigned int bytes_read;
22296 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22297 mac_ptr += bytes_read;
22298 mac_ptr += offset_size;
22302 case DW_MACRO_import:
22303 case DW_MACRO_import_sup:
22304 /* Note that, according to the spec, a transparent include
22305 chain cannot call DW_MACRO_start_file. So, we can just
22306 skip this opcode. */
22307 mac_ptr += offset_size;
22310 case DW_MACINFO_vendor_ext:
22311 /* Only skip the data by MAC_PTR. */
22312 if (!section_is_gnu)
22314 unsigned int bytes_read;
22316 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22317 mac_ptr += bytes_read;
22318 read_direct_string (abfd, mac_ptr, &bytes_read);
22319 mac_ptr += bytes_read;
22324 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22325 mac_ptr, mac_end, abfd, offset_size,
22327 if (mac_ptr == NULL)
22331 } while (macinfo_type != 0 && current_file == NULL);
22333 /* Second pass: Process all entries.
22335 Use the AT_COMMAND_LINE flag to determine whether we are still processing
22336 command-line macro definitions/undefinitions. This flag is unset when we
22337 reach the first DW_MACINFO_start_file entry. */
22339 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
22341 NULL, xcalloc, xfree));
22342 mac_ptr = section->buffer + offset;
22343 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
22344 *slot = (void *) mac_ptr;
22345 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
22346 current_file, lh, section,
22347 section_is_gnu, 0, offset_size,
22348 include_hash.get ());
22351 /* Check if the attribute's form is a DW_FORM_block*
22352 if so return true else false. */
22355 attr_form_is_block (const struct attribute *attr)
22357 return (attr == NULL ? 0 :
22358 attr->form == DW_FORM_block1
22359 || attr->form == DW_FORM_block2
22360 || attr->form == DW_FORM_block4
22361 || attr->form == DW_FORM_block
22362 || attr->form == DW_FORM_exprloc);
22365 /* Return non-zero if ATTR's value is a section offset --- classes
22366 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
22367 You may use DW_UNSND (attr) to retrieve such offsets.
22369 Section 7.5.4, "Attribute Encodings", explains that no attribute
22370 may have a value that belongs to more than one of these classes; it
22371 would be ambiguous if we did, because we use the same forms for all
22375 attr_form_is_section_offset (const struct attribute *attr)
22377 return (attr->form == DW_FORM_data4
22378 || attr->form == DW_FORM_data8
22379 || attr->form == DW_FORM_sec_offset);
22382 /* Return non-zero if ATTR's value falls in the 'constant' class, or
22383 zero otherwise. When this function returns true, you can apply
22384 dwarf2_get_attr_constant_value to it.
22386 However, note that for some attributes you must check
22387 attr_form_is_section_offset before using this test. DW_FORM_data4
22388 and DW_FORM_data8 are members of both the constant class, and of
22389 the classes that contain offsets into other debug sections
22390 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
22391 that, if an attribute's can be either a constant or one of the
22392 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
22393 taken as section offsets, not constants.
22395 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
22396 cannot handle that. */
22399 attr_form_is_constant (const struct attribute *attr)
22401 switch (attr->form)
22403 case DW_FORM_sdata:
22404 case DW_FORM_udata:
22405 case DW_FORM_data1:
22406 case DW_FORM_data2:
22407 case DW_FORM_data4:
22408 case DW_FORM_data8:
22416 /* DW_ADDR is always stored already as sect_offset; despite for the forms
22417 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
22420 attr_form_is_ref (const struct attribute *attr)
22422 switch (attr->form)
22424 case DW_FORM_ref_addr:
22429 case DW_FORM_ref_udata:
22430 case DW_FORM_GNU_ref_alt:
22437 /* Return the .debug_loc section to use for CU.
22438 For DWO files use .debug_loc.dwo. */
22440 static struct dwarf2_section_info *
22441 cu_debug_loc_section (struct dwarf2_cu *cu)
22445 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
22447 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
22449 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
22450 : &dwarf2_per_objfile->loc);
22453 /* A helper function that fills in a dwarf2_loclist_baton. */
22456 fill_in_loclist_baton (struct dwarf2_cu *cu,
22457 struct dwarf2_loclist_baton *baton,
22458 const struct attribute *attr)
22460 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22462 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
22464 baton->per_cu = cu->per_cu;
22465 gdb_assert (baton->per_cu);
22466 /* We don't know how long the location list is, but make sure we
22467 don't run off the edge of the section. */
22468 baton->size = section->size - DW_UNSND (attr);
22469 baton->data = section->buffer + DW_UNSND (attr);
22470 baton->base_address = cu->base_address;
22471 baton->from_dwo = cu->dwo_unit != NULL;
22475 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
22476 struct dwarf2_cu *cu, int is_block)
22478 struct objfile *objfile = dwarf2_per_objfile->objfile;
22479 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22481 if (attr_form_is_section_offset (attr)
22482 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
22483 the section. If so, fall through to the complaint in the
22485 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
22487 struct dwarf2_loclist_baton *baton;
22489 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
22491 fill_in_loclist_baton (cu, baton, attr);
22493 if (cu->base_known == 0)
22494 complaint (&symfile_complaints,
22495 _("Location list used without "
22496 "specifying the CU base address."));
22498 SYMBOL_ACLASS_INDEX (sym) = (is_block
22499 ? dwarf2_loclist_block_index
22500 : dwarf2_loclist_index);
22501 SYMBOL_LOCATION_BATON (sym) = baton;
22505 struct dwarf2_locexpr_baton *baton;
22507 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
22508 baton->per_cu = cu->per_cu;
22509 gdb_assert (baton->per_cu);
22511 if (attr_form_is_block (attr))
22513 /* Note that we're just copying the block's data pointer
22514 here, not the actual data. We're still pointing into the
22515 info_buffer for SYM's objfile; right now we never release
22516 that buffer, but when we do clean up properly this may
22518 baton->size = DW_BLOCK (attr)->size;
22519 baton->data = DW_BLOCK (attr)->data;
22523 dwarf2_invalid_attrib_class_complaint ("location description",
22524 SYMBOL_NATURAL_NAME (sym));
22528 SYMBOL_ACLASS_INDEX (sym) = (is_block
22529 ? dwarf2_locexpr_block_index
22530 : dwarf2_locexpr_index);
22531 SYMBOL_LOCATION_BATON (sym) = baton;
22535 /* Return the OBJFILE associated with the compilation unit CU. If CU
22536 came from a separate debuginfo file, then the master objfile is
22540 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
22542 struct objfile *objfile = per_cu->objfile;
22544 /* Return the master objfile, so that we can report and look up the
22545 correct file containing this variable. */
22546 if (objfile->separate_debug_objfile_backlink)
22547 objfile = objfile->separate_debug_objfile_backlink;
22552 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
22553 (CU_HEADERP is unused in such case) or prepare a temporary copy at
22554 CU_HEADERP first. */
22556 static const struct comp_unit_head *
22557 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
22558 struct dwarf2_per_cu_data *per_cu)
22560 const gdb_byte *info_ptr;
22563 return &per_cu->cu->header;
22565 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
22567 memset (cu_headerp, 0, sizeof (*cu_headerp));
22568 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
22569 rcuh_kind::COMPILE);
22574 /* Return the address size given in the compilation unit header for CU. */
22577 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
22579 struct comp_unit_head cu_header_local;
22580 const struct comp_unit_head *cu_headerp;
22582 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22584 return cu_headerp->addr_size;
22587 /* Return the offset size given in the compilation unit header for CU. */
22590 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
22592 struct comp_unit_head cu_header_local;
22593 const struct comp_unit_head *cu_headerp;
22595 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22597 return cu_headerp->offset_size;
22600 /* See its dwarf2loc.h declaration. */
22603 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
22605 struct comp_unit_head cu_header_local;
22606 const struct comp_unit_head *cu_headerp;
22608 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22610 if (cu_headerp->version == 2)
22611 return cu_headerp->addr_size;
22613 return cu_headerp->offset_size;
22616 /* Return the text offset of the CU. The returned offset comes from
22617 this CU's objfile. If this objfile came from a separate debuginfo
22618 file, then the offset may be different from the corresponding
22619 offset in the parent objfile. */
22622 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22624 struct objfile *objfile = per_cu->objfile;
22626 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22629 /* Return DWARF version number of PER_CU. */
22632 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
22634 return per_cu->dwarf_version;
22637 /* Locate the .debug_info compilation unit from CU's objfile which contains
22638 the DIE at OFFSET. Raises an error on failure. */
22640 static struct dwarf2_per_cu_data *
22641 dwarf2_find_containing_comp_unit (sect_offset sect_off,
22642 unsigned int offset_in_dwz,
22643 struct objfile *objfile)
22645 struct dwarf2_per_cu_data *this_cu;
22647 const sect_offset *cu_off;
22650 high = dwarf2_per_objfile->n_comp_units - 1;
22653 struct dwarf2_per_cu_data *mid_cu;
22654 int mid = low + (high - low) / 2;
22656 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22657 cu_off = &mid_cu->sect_off;
22658 if (mid_cu->is_dwz > offset_in_dwz
22659 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
22664 gdb_assert (low == high);
22665 this_cu = dwarf2_per_objfile->all_comp_units[low];
22666 cu_off = &this_cu->sect_off;
22667 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
22669 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22670 error (_("Dwarf Error: could not find partial DIE containing "
22671 "offset 0x%x [in module %s]"),
22672 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
22674 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
22676 return dwarf2_per_objfile->all_comp_units[low-1];
22680 this_cu = dwarf2_per_objfile->all_comp_units[low];
22681 if (low == dwarf2_per_objfile->n_comp_units - 1
22682 && sect_off >= this_cu->sect_off + this_cu->length)
22683 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
22684 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
22689 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22692 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22694 memset (cu, 0, sizeof (*cu));
22696 cu->per_cu = per_cu;
22697 cu->objfile = per_cu->objfile;
22698 obstack_init (&cu->comp_unit_obstack);
22701 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22704 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22705 enum language pretend_language)
22707 struct attribute *attr;
22709 /* Set the language we're debugging. */
22710 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22712 set_cu_language (DW_UNSND (attr), cu);
22715 cu->language = pretend_language;
22716 cu->language_defn = language_def (cu->language);
22719 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22722 /* Release one cached compilation unit, CU. We unlink it from the tree
22723 of compilation units, but we don't remove it from the read_in_chain;
22724 the caller is responsible for that.
22725 NOTE: DATA is a void * because this function is also used as a
22726 cleanup routine. */
22729 free_heap_comp_unit (void *data)
22731 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22733 gdb_assert (cu->per_cu != NULL);
22734 cu->per_cu->cu = NULL;
22737 obstack_free (&cu->comp_unit_obstack, NULL);
22742 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22743 when we're finished with it. We can't free the pointer itself, but be
22744 sure to unlink it from the cache. Also release any associated storage. */
22747 free_stack_comp_unit (void *data)
22749 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22751 gdb_assert (cu->per_cu != NULL);
22752 cu->per_cu->cu = NULL;
22755 obstack_free (&cu->comp_unit_obstack, NULL);
22756 cu->partial_dies = NULL;
22759 /* Free all cached compilation units. */
22762 free_cached_comp_units (void *data)
22764 struct dwarf2_per_cu_data *per_cu, **last_chain;
22766 per_cu = dwarf2_per_objfile->read_in_chain;
22767 last_chain = &dwarf2_per_objfile->read_in_chain;
22768 while (per_cu != NULL)
22770 struct dwarf2_per_cu_data *next_cu;
22772 next_cu = per_cu->cu->read_in_chain;
22774 free_heap_comp_unit (per_cu->cu);
22775 *last_chain = next_cu;
22781 /* Increase the age counter on each cached compilation unit, and free
22782 any that are too old. */
22785 age_cached_comp_units (void)
22787 struct dwarf2_per_cu_data *per_cu, **last_chain;
22789 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22790 per_cu = dwarf2_per_objfile->read_in_chain;
22791 while (per_cu != NULL)
22793 per_cu->cu->last_used ++;
22794 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22795 dwarf2_mark (per_cu->cu);
22796 per_cu = per_cu->cu->read_in_chain;
22799 per_cu = dwarf2_per_objfile->read_in_chain;
22800 last_chain = &dwarf2_per_objfile->read_in_chain;
22801 while (per_cu != NULL)
22803 struct dwarf2_per_cu_data *next_cu;
22805 next_cu = per_cu->cu->read_in_chain;
22807 if (!per_cu->cu->mark)
22809 free_heap_comp_unit (per_cu->cu);
22810 *last_chain = next_cu;
22813 last_chain = &per_cu->cu->read_in_chain;
22819 /* Remove a single compilation unit from the cache. */
22822 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22824 struct dwarf2_per_cu_data *per_cu, **last_chain;
22826 per_cu = dwarf2_per_objfile->read_in_chain;
22827 last_chain = &dwarf2_per_objfile->read_in_chain;
22828 while (per_cu != NULL)
22830 struct dwarf2_per_cu_data *next_cu;
22832 next_cu = per_cu->cu->read_in_chain;
22834 if (per_cu == target_per_cu)
22836 free_heap_comp_unit (per_cu->cu);
22838 *last_chain = next_cu;
22842 last_chain = &per_cu->cu->read_in_chain;
22848 /* Release all extra memory associated with OBJFILE. */
22851 dwarf2_free_objfile (struct objfile *objfile)
22854 = (struct dwarf2_per_objfile *) objfile_data (objfile,
22855 dwarf2_objfile_data_key);
22857 if (dwarf2_per_objfile == NULL)
22860 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
22861 free_cached_comp_units (NULL);
22863 if (dwarf2_per_objfile->quick_file_names_table)
22864 htab_delete (dwarf2_per_objfile->quick_file_names_table);
22866 if (dwarf2_per_objfile->line_header_hash)
22867 htab_delete (dwarf2_per_objfile->line_header_hash);
22869 /* Everything else should be on the objfile obstack. */
22872 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
22873 We store these in a hash table separate from the DIEs, and preserve them
22874 when the DIEs are flushed out of cache.
22876 The CU "per_cu" pointer is needed because offset alone is not enough to
22877 uniquely identify the type. A file may have multiple .debug_types sections,
22878 or the type may come from a DWO file. Furthermore, while it's more logical
22879 to use per_cu->section+offset, with Fission the section with the data is in
22880 the DWO file but we don't know that section at the point we need it.
22881 We have to use something in dwarf2_per_cu_data (or the pointer to it)
22882 because we can enter the lookup routine, get_die_type_at_offset, from
22883 outside this file, and thus won't necessarily have PER_CU->cu.
22884 Fortunately, PER_CU is stable for the life of the objfile. */
22886 struct dwarf2_per_cu_offset_and_type
22888 const struct dwarf2_per_cu_data *per_cu;
22889 sect_offset sect_off;
22893 /* Hash function for a dwarf2_per_cu_offset_and_type. */
22896 per_cu_offset_and_type_hash (const void *item)
22898 const struct dwarf2_per_cu_offset_and_type *ofs
22899 = (const struct dwarf2_per_cu_offset_and_type *) item;
22901 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
22904 /* Equality function for a dwarf2_per_cu_offset_and_type. */
22907 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
22909 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
22910 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
22911 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
22912 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
22914 return (ofs_lhs->per_cu == ofs_rhs->per_cu
22915 && ofs_lhs->sect_off == ofs_rhs->sect_off);
22918 /* Set the type associated with DIE to TYPE. Save it in CU's hash
22919 table if necessary. For convenience, return TYPE.
22921 The DIEs reading must have careful ordering to:
22922 * Not cause infite loops trying to read in DIEs as a prerequisite for
22923 reading current DIE.
22924 * Not trying to dereference contents of still incompletely read in types
22925 while reading in other DIEs.
22926 * Enable referencing still incompletely read in types just by a pointer to
22927 the type without accessing its fields.
22929 Therefore caller should follow these rules:
22930 * Try to fetch any prerequisite types we may need to build this DIE type
22931 before building the type and calling set_die_type.
22932 * After building type call set_die_type for current DIE as soon as
22933 possible before fetching more types to complete the current type.
22934 * Make the type as complete as possible before fetching more types. */
22936 static struct type *
22937 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
22939 struct dwarf2_per_cu_offset_and_type **slot, ofs;
22940 struct objfile *objfile = cu->objfile;
22941 struct attribute *attr;
22942 struct dynamic_prop prop;
22944 /* For Ada types, make sure that the gnat-specific data is always
22945 initialized (if not already set). There are a few types where
22946 we should not be doing so, because the type-specific area is
22947 already used to hold some other piece of info (eg: TYPE_CODE_FLT
22948 where the type-specific area is used to store the floatformat).
22949 But this is not a problem, because the gnat-specific information
22950 is actually not needed for these types. */
22951 if (need_gnat_info (cu)
22952 && TYPE_CODE (type) != TYPE_CODE_FUNC
22953 && TYPE_CODE (type) != TYPE_CODE_FLT
22954 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
22955 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
22956 && TYPE_CODE (type) != TYPE_CODE_METHOD
22957 && !HAVE_GNAT_AUX_INFO (type))
22958 INIT_GNAT_SPECIFIC (type);
22960 /* Read DW_AT_allocated and set in type. */
22961 attr = dwarf2_attr (die, DW_AT_allocated, cu);
22962 if (attr_form_is_block (attr))
22964 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22965 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
22967 else if (attr != NULL)
22969 complaint (&symfile_complaints,
22970 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
22971 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
22972 to_underlying (die->sect_off));
22975 /* Read DW_AT_associated and set in type. */
22976 attr = dwarf2_attr (die, DW_AT_associated, cu);
22977 if (attr_form_is_block (attr))
22979 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22980 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
22982 else if (attr != NULL)
22984 complaint (&symfile_complaints,
22985 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
22986 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
22987 to_underlying (die->sect_off));
22990 /* Read DW_AT_data_location and set in type. */
22991 attr = dwarf2_attr (die, DW_AT_data_location, cu);
22992 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22993 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
22995 if (dwarf2_per_objfile->die_type_hash == NULL)
22997 dwarf2_per_objfile->die_type_hash =
22998 htab_create_alloc_ex (127,
22999 per_cu_offset_and_type_hash,
23000 per_cu_offset_and_type_eq,
23002 &objfile->objfile_obstack,
23003 hashtab_obstack_allocate,
23004 dummy_obstack_deallocate);
23007 ofs.per_cu = cu->per_cu;
23008 ofs.sect_off = die->sect_off;
23010 slot = (struct dwarf2_per_cu_offset_and_type **)
23011 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23013 complaint (&symfile_complaints,
23014 _("A problem internal to GDB: DIE 0x%x has type already set"),
23015 to_underlying (die->sect_off));
23016 *slot = XOBNEW (&objfile->objfile_obstack,
23017 struct dwarf2_per_cu_offset_and_type);
23022 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23023 or return NULL if the die does not have a saved type. */
23025 static struct type *
23026 get_die_type_at_offset (sect_offset sect_off,
23027 struct dwarf2_per_cu_data *per_cu)
23029 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23031 if (dwarf2_per_objfile->die_type_hash == NULL)
23034 ofs.per_cu = per_cu;
23035 ofs.sect_off = sect_off;
23036 slot = ((struct dwarf2_per_cu_offset_and_type *)
23037 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23044 /* Look up the type for DIE in CU in die_type_hash,
23045 or return NULL if DIE does not have a saved type. */
23047 static struct type *
23048 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23050 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23053 /* Add a dependence relationship from CU to REF_PER_CU. */
23056 dwarf2_add_dependence (struct dwarf2_cu *cu,
23057 struct dwarf2_per_cu_data *ref_per_cu)
23061 if (cu->dependencies == NULL)
23063 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23064 NULL, &cu->comp_unit_obstack,
23065 hashtab_obstack_allocate,
23066 dummy_obstack_deallocate);
23068 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23070 *slot = ref_per_cu;
23073 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23074 Set the mark field in every compilation unit in the
23075 cache that we must keep because we are keeping CU. */
23078 dwarf2_mark_helper (void **slot, void *data)
23080 struct dwarf2_per_cu_data *per_cu;
23082 per_cu = (struct dwarf2_per_cu_data *) *slot;
23084 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23085 reading of the chain. As such dependencies remain valid it is not much
23086 useful to track and undo them during QUIT cleanups. */
23087 if (per_cu->cu == NULL)
23090 if (per_cu->cu->mark)
23092 per_cu->cu->mark = 1;
23094 if (per_cu->cu->dependencies != NULL)
23095 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23100 /* Set the mark field in CU and in every other compilation unit in the
23101 cache that we must keep because we are keeping CU. */
23104 dwarf2_mark (struct dwarf2_cu *cu)
23109 if (cu->dependencies != NULL)
23110 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23114 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23118 per_cu->cu->mark = 0;
23119 per_cu = per_cu->cu->read_in_chain;
23123 /* Trivial hash function for partial_die_info: the hash value of a DIE
23124 is its offset in .debug_info for this objfile. */
23127 partial_die_hash (const void *item)
23129 const struct partial_die_info *part_die
23130 = (const struct partial_die_info *) item;
23132 return to_underlying (part_die->sect_off);
23135 /* Trivial comparison function for partial_die_info structures: two DIEs
23136 are equal if they have the same offset. */
23139 partial_die_eq (const void *item_lhs, const void *item_rhs)
23141 const struct partial_die_info *part_die_lhs
23142 = (const struct partial_die_info *) item_lhs;
23143 const struct partial_die_info *part_die_rhs
23144 = (const struct partial_die_info *) item_rhs;
23146 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23149 static struct cmd_list_element *set_dwarf_cmdlist;
23150 static struct cmd_list_element *show_dwarf_cmdlist;
23153 set_dwarf_cmd (char *args, int from_tty)
23155 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23160 show_dwarf_cmd (char *args, int from_tty)
23162 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23165 /* Free data associated with OBJFILE, if necessary. */
23168 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23170 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23173 /* Make sure we don't accidentally use dwarf2_per_objfile while
23175 dwarf2_per_objfile = NULL;
23177 for (ix = 0; ix < data->n_comp_units; ++ix)
23178 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23180 for (ix = 0; ix < data->n_type_units; ++ix)
23181 VEC_free (dwarf2_per_cu_ptr,
23182 data->all_type_units[ix]->per_cu.imported_symtabs);
23183 xfree (data->all_type_units);
23185 VEC_free (dwarf2_section_info_def, data->types);
23187 if (data->dwo_files)
23188 free_dwo_files (data->dwo_files, objfile);
23189 if (data->dwp_file)
23190 gdb_bfd_unref (data->dwp_file->dbfd);
23192 if (data->dwz_file && data->dwz_file->dwz_bfd)
23193 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23197 /* The "save gdb-index" command. */
23199 /* In-memory buffer to prepare data to be written later to a file. */
23203 /* Copy DATA to the end of the buffer. */
23204 template<typename T>
23205 void append_data (const T &data)
23207 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23208 reinterpret_cast<const gdb_byte *> (&data + 1),
23209 grow (sizeof (data)));
23212 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23213 terminating zero is appended too. */
23214 void append_cstr0 (const char *cstr)
23216 const size_t size = strlen (cstr) + 1;
23217 std::copy (cstr, cstr + size, grow (size));
23220 /* Accept a host-format integer in VAL and append it to the buffer
23221 as a target-format integer which is LEN bytes long. */
23222 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23224 ::store_unsigned_integer (grow (len), len, byte_order, val);
23227 /* Return the size of the buffer. */
23228 size_t size () const
23230 return m_vec.size ();
23233 /* Write the buffer to FILE. */
23234 void file_write (FILE *file) const
23236 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23237 error (_("couldn't write data to file"));
23241 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23242 the start of the new block. */
23243 gdb_byte *grow (size_t size)
23245 m_vec.resize (m_vec.size () + size);
23246 return &*m_vec.end () - size;
23249 gdb::byte_vector m_vec;
23252 /* An entry in the symbol table. */
23253 struct symtab_index_entry
23255 /* The name of the symbol. */
23257 /* The offset of the name in the constant pool. */
23258 offset_type index_offset;
23259 /* A sorted vector of the indices of all the CUs that hold an object
23261 std::vector<offset_type> cu_indices;
23264 /* The symbol table. This is a power-of-2-sized hash table. */
23265 struct mapped_symtab
23269 data.resize (1024);
23272 offset_type n_elements = 0;
23273 std::vector<symtab_index_entry> data;
23276 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
23279 Function is used only during write_hash_table so no index format backward
23280 compatibility is needed. */
23282 static symtab_index_entry &
23283 find_slot (struct mapped_symtab *symtab, const char *name)
23285 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
23287 index = hash & (symtab->data.size () - 1);
23288 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
23292 if (symtab->data[index].name == NULL
23293 || strcmp (name, symtab->data[index].name) == 0)
23294 return symtab->data[index];
23295 index = (index + step) & (symtab->data.size () - 1);
23299 /* Expand SYMTAB's hash table. */
23302 hash_expand (struct mapped_symtab *symtab)
23304 auto old_entries = std::move (symtab->data);
23306 symtab->data.clear ();
23307 symtab->data.resize (old_entries.size () * 2);
23309 for (auto &it : old_entries)
23310 if (it.name != NULL)
23312 auto &ref = find_slot (symtab, it.name);
23313 ref = std::move (it);
23317 /* Add an entry to SYMTAB. NAME is the name of the symbol.
23318 CU_INDEX is the index of the CU in which the symbol appears.
23319 IS_STATIC is one if the symbol is static, otherwise zero (global). */
23322 add_index_entry (struct mapped_symtab *symtab, const char *name,
23323 int is_static, gdb_index_symbol_kind kind,
23324 offset_type cu_index)
23326 offset_type cu_index_and_attrs;
23328 ++symtab->n_elements;
23329 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
23330 hash_expand (symtab);
23332 symtab_index_entry &slot = find_slot (symtab, name);
23333 if (slot.name == NULL)
23336 /* index_offset is set later. */
23339 cu_index_and_attrs = 0;
23340 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
23341 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
23342 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
23344 /* We don't want to record an index value twice as we want to avoid the
23346 We process all global symbols and then all static symbols
23347 (which would allow us to avoid the duplication by only having to check
23348 the last entry pushed), but a symbol could have multiple kinds in one CU.
23349 To keep things simple we don't worry about the duplication here and
23350 sort and uniqufy the list after we've processed all symbols. */
23351 slot.cu_indices.push_back (cu_index_and_attrs);
23354 /* Sort and remove duplicates of all symbols' cu_indices lists. */
23357 uniquify_cu_indices (struct mapped_symtab *symtab)
23359 for (auto &entry : symtab->data)
23361 if (entry.name != NULL && !entry.cu_indices.empty ())
23363 auto &cu_indices = entry.cu_indices;
23364 std::sort (cu_indices.begin (), cu_indices.end ());
23365 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
23366 cu_indices.erase (from, cu_indices.end ());
23371 /* A form of 'const char *' suitable for container keys. Only the
23372 pointer is stored. The strings themselves are compared, not the
23377 c_str_view (const char *cstr)
23381 bool operator== (const c_str_view &other) const
23383 return strcmp (m_cstr, other.m_cstr) == 0;
23387 friend class c_str_view_hasher;
23388 const char *const m_cstr;
23391 /* A std::unordered_map::hasher for c_str_view that uses the right
23392 hash function for strings in a mapped index. */
23393 class c_str_view_hasher
23396 size_t operator () (const c_str_view &x) const
23398 return mapped_index_string_hash (INT_MAX, x.m_cstr);
23402 /* A std::unordered_map::hasher for std::vector<>. */
23403 template<typename T>
23404 class vector_hasher
23407 size_t operator () (const std::vector<T> &key) const
23409 return iterative_hash (key.data (),
23410 sizeof (key.front ()) * key.size (), 0);
23414 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
23415 constant pool entries going into the data buffer CPOOL. */
23418 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
23421 /* Elements are sorted vectors of the indices of all the CUs that
23422 hold an object of this name. */
23423 std::unordered_map<std::vector<offset_type>, offset_type,
23424 vector_hasher<offset_type>>
23427 /* We add all the index vectors to the constant pool first, to
23428 ensure alignment is ok. */
23429 for (symtab_index_entry &entry : symtab->data)
23431 if (entry.name == NULL)
23433 gdb_assert (entry.index_offset == 0);
23435 /* Finding before inserting is faster than always trying to
23436 insert, because inserting always allocates a node, does the
23437 lookup, and then destroys the new node if another node
23438 already had the same key. C++17 try_emplace will avoid
23441 = symbol_hash_table.find (entry.cu_indices);
23442 if (found != symbol_hash_table.end ())
23444 entry.index_offset = found->second;
23448 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
23449 entry.index_offset = cpool.size ();
23450 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
23451 for (const auto index : entry.cu_indices)
23452 cpool.append_data (MAYBE_SWAP (index));
23456 /* Now write out the hash table. */
23457 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
23458 for (const auto &entry : symtab->data)
23460 offset_type str_off, vec_off;
23462 if (entry.name != NULL)
23464 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
23465 if (insertpair.second)
23466 cpool.append_cstr0 (entry.name);
23467 str_off = insertpair.first->second;
23468 vec_off = entry.index_offset;
23472 /* While 0 is a valid constant pool index, it is not valid
23473 to have 0 for both offsets. */
23478 output.append_data (MAYBE_SWAP (str_off));
23479 output.append_data (MAYBE_SWAP (vec_off));
23483 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
23485 /* Helper struct for building the address table. */
23486 struct addrmap_index_data
23488 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
23489 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
23492 struct objfile *objfile;
23493 data_buf &addr_vec;
23494 psym_index_map &cu_index_htab;
23496 /* Non-zero if the previous_* fields are valid.
23497 We can't write an entry until we see the next entry (since it is only then
23498 that we know the end of the entry). */
23499 int previous_valid;
23500 /* Index of the CU in the table of all CUs in the index file. */
23501 unsigned int previous_cu_index;
23502 /* Start address of the CU. */
23503 CORE_ADDR previous_cu_start;
23506 /* Write an address entry to ADDR_VEC. */
23509 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
23510 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23512 CORE_ADDR baseaddr;
23514 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23516 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
23517 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
23518 addr_vec.append_data (MAYBE_SWAP (cu_index));
23521 /* Worker function for traversing an addrmap to build the address table. */
23524 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23526 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23527 struct partial_symtab *pst = (struct partial_symtab *) obj;
23529 if (data->previous_valid)
23530 add_address_entry (data->objfile, data->addr_vec,
23531 data->previous_cu_start, start_addr,
23532 data->previous_cu_index);
23534 data->previous_cu_start = start_addr;
23537 const auto it = data->cu_index_htab.find (pst);
23538 gdb_assert (it != data->cu_index_htab.cend ());
23539 data->previous_cu_index = it->second;
23540 data->previous_valid = 1;
23543 data->previous_valid = 0;
23548 /* Write OBJFILE's address map to ADDR_VEC.
23549 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23550 in the index file. */
23553 write_address_map (struct objfile *objfile, data_buf &addr_vec,
23554 psym_index_map &cu_index_htab)
23556 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
23558 /* When writing the address table, we have to cope with the fact that
23559 the addrmap iterator only provides the start of a region; we have to
23560 wait until the next invocation to get the start of the next region. */
23562 addrmap_index_data.objfile = objfile;
23563 addrmap_index_data.previous_valid = 0;
23565 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23566 &addrmap_index_data);
23568 /* It's highly unlikely the last entry (end address = 0xff...ff)
23569 is valid, but we should still handle it.
23570 The end address is recorded as the start of the next region, but that
23571 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23573 if (addrmap_index_data.previous_valid)
23574 add_address_entry (objfile, addr_vec,
23575 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23576 addrmap_index_data.previous_cu_index);
23579 /* Return the symbol kind of PSYM. */
23581 static gdb_index_symbol_kind
23582 symbol_kind (struct partial_symbol *psym)
23584 domain_enum domain = PSYMBOL_DOMAIN (psym);
23585 enum address_class aclass = PSYMBOL_CLASS (psym);
23593 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23595 return GDB_INDEX_SYMBOL_KIND_TYPE;
23597 case LOC_CONST_BYTES:
23598 case LOC_OPTIMIZED_OUT:
23600 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23602 /* Note: It's currently impossible to recognize psyms as enum values
23603 short of reading the type info. For now punt. */
23604 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23606 /* There are other LOC_FOO values that one might want to classify
23607 as variables, but dwarf2read.c doesn't currently use them. */
23608 return GDB_INDEX_SYMBOL_KIND_OTHER;
23610 case STRUCT_DOMAIN:
23611 return GDB_INDEX_SYMBOL_KIND_TYPE;
23613 return GDB_INDEX_SYMBOL_KIND_OTHER;
23617 /* Add a list of partial symbols to SYMTAB. */
23620 write_psymbols (struct mapped_symtab *symtab,
23621 std::unordered_set<partial_symbol *> &psyms_seen,
23622 struct partial_symbol **psymp,
23624 offset_type cu_index,
23627 for (; count-- > 0; ++psymp)
23629 struct partial_symbol *psym = *psymp;
23631 if (SYMBOL_LANGUAGE (psym) == language_ada)
23632 error (_("Ada is not currently supported by the index"));
23634 /* Only add a given psymbol once. */
23635 if (psyms_seen.insert (psym).second)
23637 gdb_index_symbol_kind kind = symbol_kind (psym);
23639 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23640 is_static, kind, cu_index);
23645 /* A helper struct used when iterating over debug_types. */
23646 struct signatured_type_index_data
23648 signatured_type_index_data (data_buf &types_list_,
23649 std::unordered_set<partial_symbol *> &psyms_seen_)
23650 : types_list (types_list_), psyms_seen (psyms_seen_)
23653 struct objfile *objfile;
23654 struct mapped_symtab *symtab;
23655 data_buf &types_list;
23656 std::unordered_set<partial_symbol *> &psyms_seen;
23660 /* A helper function that writes a single signatured_type to an
23664 write_one_signatured_type (void **slot, void *d)
23666 struct signatured_type_index_data *info
23667 = (struct signatured_type_index_data *) d;
23668 struct signatured_type *entry = (struct signatured_type *) *slot;
23669 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23671 write_psymbols (info->symtab,
23673 info->objfile->global_psymbols.list
23674 + psymtab->globals_offset,
23675 psymtab->n_global_syms, info->cu_index,
23677 write_psymbols (info->symtab,
23679 info->objfile->static_psymbols.list
23680 + psymtab->statics_offset,
23681 psymtab->n_static_syms, info->cu_index,
23684 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23685 to_underlying (entry->per_cu.sect_off));
23686 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23687 to_underlying (entry->type_offset_in_tu));
23688 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
23695 /* Recurse into all "included" dependencies and count their symbols as
23696 if they appeared in this psymtab. */
23699 recursively_count_psymbols (struct partial_symtab *psymtab,
23700 size_t &psyms_seen)
23702 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
23703 if (psymtab->dependencies[i]->user != NULL)
23704 recursively_count_psymbols (psymtab->dependencies[i],
23707 psyms_seen += psymtab->n_global_syms;
23708 psyms_seen += psymtab->n_static_syms;
23711 /* Recurse into all "included" dependencies and write their symbols as
23712 if they appeared in this psymtab. */
23715 recursively_write_psymbols (struct objfile *objfile,
23716 struct partial_symtab *psymtab,
23717 struct mapped_symtab *symtab,
23718 std::unordered_set<partial_symbol *> &psyms_seen,
23719 offset_type cu_index)
23723 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23724 if (psymtab->dependencies[i]->user != NULL)
23725 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23726 symtab, psyms_seen, cu_index);
23728 write_psymbols (symtab,
23730 objfile->global_psymbols.list + psymtab->globals_offset,
23731 psymtab->n_global_syms, cu_index,
23733 write_psymbols (symtab,
23735 objfile->static_psymbols.list + psymtab->statics_offset,
23736 psymtab->n_static_syms, cu_index,
23740 /* Closes FILE on scope exit. */
23743 explicit file_closer (FILE *file)
23748 { fclose (m_file); }
23754 /* Create an index file for OBJFILE in the directory DIR. */
23757 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23759 if (dwarf2_per_objfile->using_index)
23760 error (_("Cannot use an index to create the index"));
23762 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23763 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23765 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23769 if (stat (objfile_name (objfile), &st) < 0)
23770 perror_with_name (objfile_name (objfile));
23772 std::string filename (std::string (dir) + SLASH_STRING
23773 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
23775 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb");
23777 error (_("Can't open `%s' for writing"), filename.c_str ());
23779 /* Order matters here; we want FILE to be closed before FILENAME is
23780 unlinked, because on MS-Windows one cannot delete a file that is
23781 still open. (Don't call anything here that might throw until
23782 file_closer is created.) */
23783 gdb::unlinker unlink_file (filename.c_str ());
23784 file_closer close_out_file (out_file);
23786 mapped_symtab symtab;
23789 /* While we're scanning CU's create a table that maps a psymtab pointer
23790 (which is what addrmap records) to its index (which is what is recorded
23791 in the index file). This will later be needed to write the address
23793 psym_index_map cu_index_htab;
23794 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
23796 /* The CU list is already sorted, so we don't need to do additional
23797 work here. Also, the debug_types entries do not appear in
23798 all_comp_units, but only in their own hash table. */
23800 /* The psyms_seen set is potentially going to be largish (~40k
23801 elements when indexing a -g3 build of GDB itself). Estimate the
23802 number of elements in order to avoid too many rehashes, which
23803 require rebuilding buckets and thus many trips to
23805 size_t psyms_count = 0;
23806 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23808 struct dwarf2_per_cu_data *per_cu
23809 = dwarf2_per_objfile->all_comp_units[i];
23810 struct partial_symtab *psymtab = per_cu->v.psymtab;
23812 if (psymtab != NULL && psymtab->user == NULL)
23813 recursively_count_psymbols (psymtab, psyms_count);
23815 /* Generating an index for gdb itself shows a ratio of
23816 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
23817 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
23818 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23820 struct dwarf2_per_cu_data *per_cu
23821 = dwarf2_per_objfile->all_comp_units[i];
23822 struct partial_symtab *psymtab = per_cu->v.psymtab;
23824 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23825 It may be referenced from a local scope but in such case it does not
23826 need to be present in .gdb_index. */
23827 if (psymtab == NULL)
23830 if (psymtab->user == NULL)
23831 recursively_write_psymbols (objfile, psymtab, &symtab,
23834 const auto insertpair = cu_index_htab.emplace (psymtab, i);
23835 gdb_assert (insertpair.second);
23837 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
23838 to_underlying (per_cu->sect_off));
23839 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
23842 /* Dump the address map. */
23844 write_address_map (objfile, addr_vec, cu_index_htab);
23846 /* Write out the .debug_type entries, if any. */
23847 data_buf types_cu_list;
23848 if (dwarf2_per_objfile->signatured_types)
23850 signatured_type_index_data sig_data (types_cu_list,
23853 sig_data.objfile = objfile;
23854 sig_data.symtab = &symtab;
23855 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23856 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23857 write_one_signatured_type, &sig_data);
23860 /* Now that we've processed all symbols we can shrink their cu_indices
23862 uniquify_cu_indices (&symtab);
23864 data_buf symtab_vec, constant_pool;
23865 write_hash_table (&symtab, symtab_vec, constant_pool);
23868 const offset_type size_of_contents = 6 * sizeof (offset_type);
23869 offset_type total_len = size_of_contents;
23871 /* The version number. */
23872 contents.append_data (MAYBE_SWAP (8));
23874 /* The offset of the CU list from the start of the file. */
23875 contents.append_data (MAYBE_SWAP (total_len));
23876 total_len += cu_list.size ();
23878 /* The offset of the types CU list from the start of the file. */
23879 contents.append_data (MAYBE_SWAP (total_len));
23880 total_len += types_cu_list.size ();
23882 /* The offset of the address table from the start of the file. */
23883 contents.append_data (MAYBE_SWAP (total_len));
23884 total_len += addr_vec.size ();
23886 /* The offset of the symbol table from the start of the file. */
23887 contents.append_data (MAYBE_SWAP (total_len));
23888 total_len += symtab_vec.size ();
23890 /* The offset of the constant pool from the start of the file. */
23891 contents.append_data (MAYBE_SWAP (total_len));
23892 total_len += constant_pool.size ();
23894 gdb_assert (contents.size () == size_of_contents);
23896 contents.file_write (out_file);
23897 cu_list.file_write (out_file);
23898 types_cu_list.file_write (out_file);
23899 addr_vec.file_write (out_file);
23900 symtab_vec.file_write (out_file);
23901 constant_pool.file_write (out_file);
23903 /* We want to keep the file. */
23904 unlink_file.keep ();
23907 /* Implementation of the `save gdb-index' command.
23909 Note that the file format used by this command is documented in the
23910 GDB manual. Any changes here must be documented there. */
23913 save_gdb_index_command (char *arg, int from_tty)
23915 struct objfile *objfile;
23918 error (_("usage: save gdb-index DIRECTORY"));
23920 ALL_OBJFILES (objfile)
23924 /* If the objfile does not correspond to an actual file, skip it. */
23925 if (stat (objfile_name (objfile), &st) < 0)
23929 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23930 dwarf2_objfile_data_key);
23931 if (dwarf2_per_objfile)
23936 write_psymtabs_to_index (objfile, arg);
23938 CATCH (except, RETURN_MASK_ERROR)
23940 exception_fprintf (gdb_stderr, except,
23941 _("Error while writing index for `%s': "),
23942 objfile_name (objfile));
23951 int dwarf_always_disassemble;
23954 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
23955 struct cmd_list_element *c, const char *value)
23957 fprintf_filtered (file,
23958 _("Whether to always disassemble "
23959 "DWARF expressions is %s.\n"),
23964 show_check_physname (struct ui_file *file, int from_tty,
23965 struct cmd_list_element *c, const char *value)
23967 fprintf_filtered (file,
23968 _("Whether to check \"physname\" is %s.\n"),
23972 void _initialize_dwarf2_read (void);
23975 _initialize_dwarf2_read (void)
23977 struct cmd_list_element *c;
23979 dwarf2_objfile_data_key
23980 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
23982 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
23983 Set DWARF specific variables.\n\
23984 Configure DWARF variables such as the cache size"),
23985 &set_dwarf_cmdlist, "maintenance set dwarf ",
23986 0/*allow-unknown*/, &maintenance_set_cmdlist);
23988 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
23989 Show DWARF specific variables\n\
23990 Show DWARF variables such as the cache size"),
23991 &show_dwarf_cmdlist, "maintenance show dwarf ",
23992 0/*allow-unknown*/, &maintenance_show_cmdlist);
23994 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
23995 &dwarf_max_cache_age, _("\
23996 Set the upper bound on the age of cached DWARF compilation units."), _("\
23997 Show the upper bound on the age of cached DWARF compilation units."), _("\
23998 A higher limit means that cached compilation units will be stored\n\
23999 in memory longer, and more total memory will be used. Zero disables\n\
24000 caching, which can slow down startup."),
24002 show_dwarf_max_cache_age,
24003 &set_dwarf_cmdlist,
24004 &show_dwarf_cmdlist);
24006 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24007 &dwarf_always_disassemble, _("\
24008 Set whether `info address' always disassembles DWARF expressions."), _("\
24009 Show whether `info address' always disassembles DWARF expressions."), _("\
24010 When enabled, DWARF expressions are always printed in an assembly-like\n\
24011 syntax. When disabled, expressions will be printed in a more\n\
24012 conversational style, when possible."),
24014 show_dwarf_always_disassemble,
24015 &set_dwarf_cmdlist,
24016 &show_dwarf_cmdlist);
24018 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24019 Set debugging of the DWARF reader."), _("\
24020 Show debugging of the DWARF reader."), _("\
24021 When enabled (non-zero), debugging messages are printed during DWARF\n\
24022 reading and symtab expansion. A value of 1 (one) provides basic\n\
24023 information. A value greater than 1 provides more verbose information."),
24026 &setdebuglist, &showdebuglist);
24028 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24029 Set debugging of the DWARF DIE reader."), _("\
24030 Show debugging of the DWARF DIE reader."), _("\
24031 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24032 The value is the maximum depth to print."),
24035 &setdebuglist, &showdebuglist);
24037 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24038 Set debugging of the dwarf line reader."), _("\
24039 Show debugging of the dwarf line reader."), _("\
24040 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24041 A value of 1 (one) provides basic information.\n\
24042 A value greater than 1 provides more verbose information."),
24045 &setdebuglist, &showdebuglist);
24047 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24048 Set cross-checking of \"physname\" code against demangler."), _("\
24049 Show cross-checking of \"physname\" code against demangler."), _("\
24050 When enabled, GDB's internal \"physname\" code is checked against\n\
24052 NULL, show_check_physname,
24053 &setdebuglist, &showdebuglist);
24055 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24056 no_class, &use_deprecated_index_sections, _("\
24057 Set whether to use deprecated gdb_index sections."), _("\
24058 Show whether to use deprecated gdb_index sections."), _("\
24059 When enabled, deprecated .gdb_index sections are used anyway.\n\
24060 Normally they are ignored either because of a missing feature or\n\
24061 performance issue.\n\
24062 Warning: This option must be enabled before gdb reads the file."),
24065 &setlist, &showlist);
24067 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24069 Save a gdb-index file.\n\
24070 Usage: save gdb-index DIRECTORY"),
24072 set_cmd_completer (c, filename_completer);
24074 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24075 &dwarf2_locexpr_funcs);
24076 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24077 &dwarf2_loclist_funcs);
24079 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24080 &dwarf2_block_frame_base_locexpr_funcs);
24081 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24082 &dwarf2_block_frame_base_loclist_funcs);